| /* |
| * SSLv3/TLSv1 shared functions |
| * |
| * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| * This file is part of mbed TLS (https://tls.mbed.org) |
| */ |
| /* |
| * The SSL 3.0 specification was drafted by Netscape in 1996, |
| * and became an IETF standard in 1999. |
| * |
| * http://wp.netscape.com/eng/ssl3/ |
| * http://www.ietf.org/rfc/rfc2246.txt |
| * http://www.ietf.org/rfc/rfc4346.txt |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_SSL_TLS_C) |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdlib.h> |
| #define mbedtls_calloc calloc |
| #define mbedtls_free free |
| #endif |
| |
| #include "mbedtls/debug.h" |
| #include "mbedtls/ssl.h" |
| #include "mbedtls/ssl_internal.h" |
| #include "mbedtls/platform_util.h" |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| #include "mbedtls/oid.h" |
| #endif |
| |
| static void ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl ); |
| static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl ); |
| |
| /* Length of the "epoch" field in the record header */ |
| static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| return( 2 ); |
| #else |
| ((void) ssl); |
| #endif |
| return( 0 ); |
| } |
| |
| /* |
| * Start a timer. |
| * Passing millisecs = 0 cancels a running timer. |
| */ |
| static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs ) |
| { |
| if( ssl->f_set_timer == NULL ) |
| return; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) ); |
| ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs ); |
| } |
| |
| /* |
| * Return -1 is timer is expired, 0 if it isn't. |
| */ |
| static int ssl_check_timer( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->f_get_timer == NULL ) |
| return( 0 ); |
| |
| if( ssl->f_get_timer( ssl->p_timer ) == 2 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) ); |
| return( -1 ); |
| } |
| |
| return( 0 ); |
| } |
| |
| static void ssl_update_out_pointers( mbedtls_ssl_context *ssl, |
| mbedtls_ssl_transform *transform ); |
| static void ssl_update_in_pointers( mbedtls_ssl_context *ssl, |
| mbedtls_ssl_transform *transform ); |
| |
| #define SSL_DONT_FORCE_FLUSH 0 |
| #define SSL_FORCE_FLUSH 1 |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| |
| /* Forward declarations for functions related to message buffering. */ |
| static void ssl_buffering_free( mbedtls_ssl_context *ssl ); |
| static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, |
| uint8_t slot ); |
| static void ssl_free_buffered_record( mbedtls_ssl_context *ssl ); |
| static int ssl_load_buffered_message( mbedtls_ssl_context *ssl ); |
| static int ssl_load_buffered_record( mbedtls_ssl_context *ssl ); |
| static int ssl_buffer_message( mbedtls_ssl_context *ssl ); |
| static int ssl_buffer_future_record( mbedtls_ssl_context *ssl ); |
| static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl ); |
| |
| static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl ); |
| static size_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl ) |
| { |
| size_t mtu = ssl_get_current_mtu( ssl ); |
| |
| if( mtu != 0 && mtu < MBEDTLS_SSL_OUT_BUFFER_LEN ) |
| return( mtu ); |
| |
| return( MBEDTLS_SSL_OUT_BUFFER_LEN ); |
| } |
| |
| static int ssl_get_remaining_space_in_datagram( mbedtls_ssl_context const *ssl ) |
| { |
| size_t const bytes_written = ssl->out_left; |
| size_t const mtu = ssl_get_maximum_datagram_size( ssl ); |
| |
| /* Double-check that the write-index hasn't gone |
| * past what we can transmit in a single datagram. */ |
| if( bytes_written > mtu ) |
| { |
| /* Should never happen... */ |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| return( (int) ( mtu - bytes_written ) ); |
| } |
| |
| static int ssl_get_remaining_payload_in_datagram( mbedtls_ssl_context const *ssl ) |
| { |
| int ret; |
| size_t remaining, expansion; |
| size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; |
| |
| #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) |
| const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl ); |
| |
| if( max_len > mfl ) |
| max_len = mfl; |
| |
| /* By the standard (RFC 6066 Sect. 4), the MFL extension |
| * only limits the maximum record payload size, so in theory |
| * we would be allowed to pack multiple records of payload size |
| * MFL into a single datagram. However, this would mean that there's |
| * no way to explicitly communicate MTU restrictions to the peer. |
| * |
| * The following reduction of max_len makes sure that we never |
| * write datagrams larger than MFL + Record Expansion Overhead. |
| */ |
| if( max_len <= ssl->out_left ) |
| return( 0 ); |
| |
| max_len -= ssl->out_left; |
| #endif |
| |
| ret = ssl_get_remaining_space_in_datagram( ssl ); |
| if( ret < 0 ) |
| return( ret ); |
| remaining = (size_t) ret; |
| |
| ret = mbedtls_ssl_get_record_expansion( ssl ); |
| if( ret < 0 ) |
| return( ret ); |
| expansion = (size_t) ret; |
| |
| if( remaining <= expansion ) |
| return( 0 ); |
| |
| remaining -= expansion; |
| if( remaining >= max_len ) |
| remaining = max_len; |
| |
| return( (int) remaining ); |
| } |
| |
| /* |
| * Double the retransmit timeout value, within the allowed range, |
| * returning -1 if the maximum value has already been reached. |
| */ |
| static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl ) |
| { |
| uint32_t new_timeout; |
| |
| if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max ) |
| return( -1 ); |
| |
| /* Implement the final paragraph of RFC 6347 section 4.1.1.1 |
| * in the following way: after the initial transmission and a first |
| * retransmission, back off to a temporary estimated MTU of 508 bytes. |
| * This value is guaranteed to be deliverable (if not guaranteed to be |
| * delivered) of any compliant IPv4 (and IPv6) network, and should work |
| * on most non-IP stacks too. */ |
| if( ssl->handshake->retransmit_timeout != ssl->conf->hs_timeout_min ) |
| { |
| ssl->handshake->mtu = 508; |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "mtu autoreduction to %d bytes", ssl->handshake->mtu ) ); |
| } |
| |
| new_timeout = 2 * ssl->handshake->retransmit_timeout; |
| |
| /* Avoid arithmetic overflow and range overflow */ |
| if( new_timeout < ssl->handshake->retransmit_timeout || |
| new_timeout > ssl->conf->hs_timeout_max ) |
| { |
| new_timeout = ssl->conf->hs_timeout_max; |
| } |
| |
| ssl->handshake->retransmit_timeout = new_timeout; |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", |
| ssl->handshake->retransmit_timeout ) ); |
| |
| return( 0 ); |
| } |
| |
| static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl ) |
| { |
| ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min; |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", |
| ssl->handshake->retransmit_timeout ) ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) |
| /* |
| * Convert max_fragment_length codes to length. |
| * RFC 6066 says: |
| * enum{ |
| * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) |
| * } MaxFragmentLength; |
| * and we add 0 -> extension unused |
| */ |
| static unsigned int ssl_mfl_code_to_length( int mfl ) |
| { |
| switch( mfl ) |
| { |
| case MBEDTLS_SSL_MAX_FRAG_LEN_NONE: |
| return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); |
| case MBEDTLS_SSL_MAX_FRAG_LEN_512: |
| return 512; |
| case MBEDTLS_SSL_MAX_FRAG_LEN_1024: |
| return 1024; |
| case MBEDTLS_SSL_MAX_FRAG_LEN_2048: |
| return 2048; |
| case MBEDTLS_SSL_MAX_FRAG_LEN_4096: |
| return 4096; |
| default: |
| return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src ) |
| { |
| mbedtls_ssl_session_free( dst ); |
| memcpy( dst, src, sizeof( mbedtls_ssl_session ) ); |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| if( src->peer_cert != NULL ) |
| { |
| int ret; |
| |
| dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) ); |
| if( dst->peer_cert == NULL ) |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| |
| mbedtls_x509_crt_init( dst->peer_cert ); |
| |
| if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p, |
| src->peer_cert->raw.len ) ) != 0 ) |
| { |
| mbedtls_free( dst->peer_cert ); |
| dst->peer_cert = NULL; |
| return( ret ); |
| } |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) |
| if( src->ticket != NULL ) |
| { |
| dst->ticket = mbedtls_calloc( 1, src->ticket_len ); |
| if( dst->ticket == NULL ) |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| |
| memcpy( dst->ticket, src->ticket, src->ticket_len ); |
| } |
| #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl, |
| const unsigned char *key_enc, const unsigned char *key_dec, |
| size_t keylen, |
| const unsigned char *iv_enc, const unsigned char *iv_dec, |
| size_t ivlen, |
| const unsigned char *mac_enc, const unsigned char *mac_dec, |
| size_t maclen ) = NULL; |
| int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL; |
| int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL; |
| int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL; |
| int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL; |
| int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL; |
| #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ |
| |
| /* |
| * Key material generation |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| static int ssl3_prf( const unsigned char *secret, size_t slen, |
| const char *label, |
| const unsigned char *random, size_t rlen, |
| unsigned char *dstbuf, size_t dlen ) |
| { |
| int ret = 0; |
| size_t i; |
| mbedtls_md5_context md5; |
| mbedtls_sha1_context sha1; |
| unsigned char padding[16]; |
| unsigned char sha1sum[20]; |
| ((void)label); |
| |
| mbedtls_md5_init( &md5 ); |
| mbedtls_sha1_init( &sha1 ); |
| |
| /* |
| * SSLv3: |
| * block = |
| * MD5( secret + SHA1( 'A' + secret + random ) ) + |
| * MD5( secret + SHA1( 'BB' + secret + random ) ) + |
| * MD5( secret + SHA1( 'CCC' + secret + random ) ) + |
| * ... |
| */ |
| for( i = 0; i < dlen / 16; i++ ) |
| { |
| memset( padding, (unsigned char) ('A' + i), 1 + i ); |
| |
| if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 ) |
| goto exit; |
| |
| if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 ) |
| goto exit; |
| if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 ) |
| goto exit; |
| } |
| |
| exit: |
| mbedtls_md5_free( &md5 ); |
| mbedtls_sha1_free( &sha1 ); |
| |
| mbedtls_platform_zeroize( padding, sizeof( padding ) ); |
| mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| static int tls1_prf( const unsigned char *secret, size_t slen, |
| const char *label, |
| const unsigned char *random, size_t rlen, |
| unsigned char *dstbuf, size_t dlen ) |
| { |
| size_t nb, hs; |
| size_t i, j, k; |
| const unsigned char *S1, *S2; |
| unsigned char tmp[128]; |
| unsigned char h_i[20]; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_md_context_t md_ctx; |
| int ret; |
| |
| mbedtls_md_init( &md_ctx ); |
| |
| if( sizeof( tmp ) < 20 + strlen( label ) + rlen ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| hs = ( slen + 1 ) / 2; |
| S1 = secret; |
| S2 = secret + slen - hs; |
| |
| nb = strlen( label ); |
| memcpy( tmp + 20, label, nb ); |
| memcpy( tmp + 20 + nb, random, rlen ); |
| nb += rlen; |
| |
| /* |
| * First compute P_md5(secret,label+random)[0..dlen] |
| */ |
| if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL ) |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| |
| if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) |
| return( ret ); |
| |
| mbedtls_md_hmac_starts( &md_ctx, S1, hs ); |
| mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); |
| mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); |
| |
| for( i = 0; i < dlen; i += 16 ) |
| { |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb ); |
| mbedtls_md_hmac_finish( &md_ctx, h_i ); |
| |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 ); |
| mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); |
| |
| k = ( i + 16 > dlen ) ? dlen % 16 : 16; |
| |
| for( j = 0; j < k; j++ ) |
| dstbuf[i + j] = h_i[j]; |
| } |
| |
| mbedtls_md_free( &md_ctx ); |
| |
| /* |
| * XOR out with P_sha1(secret,label+random)[0..dlen] |
| */ |
| if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL ) |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| |
| if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) |
| return( ret ); |
| |
| mbedtls_md_hmac_starts( &md_ctx, S2, hs ); |
| mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); |
| mbedtls_md_hmac_finish( &md_ctx, tmp ); |
| |
| for( i = 0; i < dlen; i += 20 ) |
| { |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb ); |
| mbedtls_md_hmac_finish( &md_ctx, h_i ); |
| |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, tmp, 20 ); |
| mbedtls_md_hmac_finish( &md_ctx, tmp ); |
| |
| k = ( i + 20 > dlen ) ? dlen % 20 : 20; |
| |
| for( j = 0; j < k; j++ ) |
| dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); |
| } |
| |
| mbedtls_md_free( &md_ctx ); |
| |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); |
| mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| static int tls_prf_generic( mbedtls_md_type_t md_type, |
| const unsigned char *secret, size_t slen, |
| const char *label, |
| const unsigned char *random, size_t rlen, |
| unsigned char *dstbuf, size_t dlen ) |
| { |
| size_t nb; |
| size_t i, j, k, md_len; |
| unsigned char tmp[128]; |
| unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_md_context_t md_ctx; |
| int ret; |
| |
| mbedtls_md_init( &md_ctx ); |
| |
| if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL ) |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| |
| md_len = mbedtls_md_get_size( md_info ); |
| |
| if( sizeof( tmp ) < md_len + strlen( label ) + rlen ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| nb = strlen( label ); |
| memcpy( tmp + md_len, label, nb ); |
| memcpy( tmp + md_len + nb, random, rlen ); |
| nb += rlen; |
| |
| /* |
| * Compute P_<hash>(secret, label + random)[0..dlen] |
| */ |
| if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) |
| return( ret ); |
| |
| mbedtls_md_hmac_starts( &md_ctx, secret, slen ); |
| mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb ); |
| mbedtls_md_hmac_finish( &md_ctx, tmp ); |
| |
| for( i = 0; i < dlen; i += md_len ) |
| { |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb ); |
| mbedtls_md_hmac_finish( &md_ctx, h_i ); |
| |
| mbedtls_md_hmac_reset ( &md_ctx ); |
| mbedtls_md_hmac_update( &md_ctx, tmp, md_len ); |
| mbedtls_md_hmac_finish( &md_ctx, tmp ); |
| |
| k = ( i + md_len > dlen ) ? dlen % md_len : md_len; |
| |
| for( j = 0; j < k; j++ ) |
| dstbuf[i + j] = h_i[j]; |
| } |
| |
| mbedtls_md_free( &md_ctx ); |
| |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); |
| mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SHA256_C) |
| static int tls_prf_sha256( const unsigned char *secret, size_t slen, |
| const char *label, |
| const unsigned char *random, size_t rlen, |
| unsigned char *dstbuf, size_t dlen ) |
| { |
| return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen, |
| label, random, rlen, dstbuf, dlen ) ); |
| } |
| #endif /* MBEDTLS_SHA256_C */ |
| |
| #if defined(MBEDTLS_SHA512_C) |
| static int tls_prf_sha384( const unsigned char *secret, size_t slen, |
| const char *label, |
| const unsigned char *random, size_t rlen, |
| unsigned char *dstbuf, size_t dlen ) |
| { |
| return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen, |
| label, random, rlen, dstbuf, dlen ) ); |
| } |
| #endif /* MBEDTLS_SHA512_C */ |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t ); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * ); |
| static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int ); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * ); |
| static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int ); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t ); |
| static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * ); |
| static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int ); |
| #endif |
| |
| #if defined(MBEDTLS_SHA512_C) |
| static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t ); |
| static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * ); |
| static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int ); |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl ) |
| { |
| int ret = 0; |
| unsigned char tmp[64]; |
| unsigned char keyblk[256]; |
| unsigned char *key1; |
| unsigned char *key2; |
| unsigned char *mac_enc; |
| unsigned char *mac_dec; |
| size_t mac_key_len; |
| size_t iv_copy_len; |
| const mbedtls_cipher_info_t *cipher_info; |
| const mbedtls_md_info_t *md_info; |
| |
| mbedtls_ssl_session *session = ssl->session_negotiate; |
| mbedtls_ssl_transform *transform = ssl->transform_negotiate; |
| mbedtls_ssl_handshake_params *handshake = ssl->handshake; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); |
| |
| cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher ); |
| if( cipher_info == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found", |
| transform->ciphersuite_info->cipher ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac ); |
| if( md_info == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found", |
| transform->ciphersuite_info->mac ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| /* |
| * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| handshake->tls_prf = ssl3_prf; |
| handshake->calc_verify = ssl_calc_verify_ssl; |
| handshake->calc_finished = ssl_calc_finished_ssl; |
| } |
| else |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) |
| { |
| handshake->tls_prf = tls1_prf; |
| handshake->calc_verify = ssl_calc_verify_tls; |
| handshake->calc_finished = ssl_calc_finished_tls; |
| } |
| else |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA512_C) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && |
| transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) |
| { |
| handshake->tls_prf = tls_prf_sha384; |
| handshake->calc_verify = ssl_calc_verify_tls_sha384; |
| handshake->calc_finished = ssl_calc_finished_tls_sha384; |
| } |
| else |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) |
| { |
| handshake->tls_prf = tls_prf_sha256; |
| handshake->calc_verify = ssl_calc_verify_tls_sha256; |
| handshake->calc_finished = ssl_calc_finished_tls_sha256; |
| } |
| else |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* |
| * SSLv3: |
| * master = |
| * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) + |
| * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) + |
| * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) ) |
| * |
| * TLSv1+: |
| * master = PRF( premaster, "master secret", randbytes )[0..47] |
| */ |
| if( handshake->resume == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster, |
| handshake->pmslen ); |
| |
| #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) |
| if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) |
| { |
| unsigned char session_hash[48]; |
| size_t hash_len; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) ); |
| |
| ssl->handshake->calc_verify( ssl, session_hash ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) |
| { |
| #if defined(MBEDTLS_SHA512_C) |
| if( ssl->transform_negotiate->ciphersuite_info->mac == |
| MBEDTLS_MD_SHA384 ) |
| { |
| hash_len = 48; |
| } |
| else |
| #endif |
| hash_len = 32; |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| hash_len = 36; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len ); |
| |
| ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, |
| "extended master secret", |
| session_hash, hash_len, |
| session->master, 48 ); |
| if( ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); |
| return( ret ); |
| } |
| |
| } |
| else |
| #endif |
| ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, |
| "master secret", |
| handshake->randbytes, 64, |
| session->master, 48 ); |
| if( ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); |
| return( ret ); |
| } |
| |
| mbedtls_platform_zeroize( handshake->premaster, |
| sizeof(handshake->premaster) ); |
| } |
| else |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); |
| |
| /* |
| * Swap the client and server random values. |
| */ |
| memcpy( tmp, handshake->randbytes, 64 ); |
| memcpy( handshake->randbytes, tmp + 32, 32 ); |
| memcpy( handshake->randbytes + 32, tmp, 32 ); |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); |
| |
| /* |
| * SSLv3: |
| * key block = |
| * MD5( master + SHA1( 'A' + master + randbytes ) ) + |
| * MD5( master + SHA1( 'BB' + master + randbytes ) ) + |
| * MD5( master + SHA1( 'CCC' + master + randbytes ) ) + |
| * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) + |
| * ... |
| * |
| * TLSv1: |
| * key block = PRF( master, "key expansion", randbytes ) |
| */ |
| ret = handshake->tls_prf( session->master, 48, "key expansion", |
| handshake->randbytes, 64, keyblk, 256 ); |
| if( ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", |
| mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) ); |
| MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); |
| |
| mbedtls_platform_zeroize( handshake->randbytes, |
| sizeof( handshake->randbytes ) ); |
| |
| /* |
| * Determine the appropriate key, IV and MAC length. |
| */ |
| |
| transform->keylen = cipher_info->key_bitlen / 8; |
| |
| if( cipher_info->mode == MBEDTLS_MODE_GCM || |
| cipher_info->mode == MBEDTLS_MODE_CCM || |
| cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) |
| { |
| size_t taglen, explicit_ivlen; |
| |
| transform->maclen = 0; |
| mac_key_len = 0; |
| |
| /* All modes haves 96-bit IVs; |
| * GCM and CCM has 4 implicit and 8 explicit bytes |
| * ChachaPoly has all 12 bytes implicit |
| */ |
| transform->ivlen = 12; |
| if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) |
| transform->fixed_ivlen = 12; |
| else |
| transform->fixed_ivlen = 4; |
| |
| /* All modes have 128-bit tags, except CCM_8 (ciphersuite flag) */ |
| taglen = transform->ciphersuite_info->flags & |
| MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; |
| |
| |
| /* Minimum length of encrypted record */ |
| explicit_ivlen = transform->ivlen - transform->fixed_ivlen; |
| transform->minlen = explicit_ivlen + taglen; |
| } |
| else |
| { |
| /* Initialize HMAC contexts */ |
| if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 || |
| ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); |
| return( ret ); |
| } |
| |
| /* Get MAC length */ |
| mac_key_len = mbedtls_md_get_size( md_info ); |
| transform->maclen = mac_key_len; |
| |
| #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) |
| /* |
| * If HMAC is to be truncated, we shall keep the leftmost bytes, |
| * (rfc 6066 page 13 or rfc 2104 section 4), |
| * so we only need to adjust the length here. |
| */ |
| if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) |
| { |
| transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN; |
| |
| #if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT) |
| /* Fall back to old, non-compliant version of the truncated |
| * HMAC implementation which also truncates the key |
| * (Mbed TLS versions from 1.3 to 2.6.0) */ |
| mac_key_len = transform->maclen; |
| #endif |
| } |
| #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ |
| |
| /* IV length */ |
| transform->ivlen = cipher_info->iv_size; |
| |
| /* Minimum length */ |
| if( cipher_info->mode == MBEDTLS_MODE_STREAM ) |
| transform->minlen = transform->maclen; |
| else |
| { |
| /* |
| * GenericBlockCipher: |
| * 1. if EtM is in use: one block plus MAC |
| * otherwise: * first multiple of blocklen greater than maclen |
| * 2. IV except for SSL3 and TLS 1.0 |
| */ |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) |
| { |
| transform->minlen = transform->maclen |
| + cipher_info->block_size; |
| } |
| else |
| #endif |
| { |
| transform->minlen = transform->maclen |
| + cipher_info->block_size |
| - transform->maclen % cipher_info->block_size; |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || |
| ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 ) |
| ; /* No need to adjust minlen */ |
| else |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 || |
| ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) |
| { |
| transform->minlen += transform->ivlen; |
| } |
| else |
| #endif |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d", |
| transform->keylen, transform->minlen, transform->ivlen, |
| transform->maclen ) ); |
| |
| /* |
| * Finally setup the cipher contexts, IVs and MAC secrets. |
| */ |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| { |
| key1 = keyblk + mac_key_len * 2; |
| key2 = keyblk + mac_key_len * 2 + transform->keylen; |
| |
| mac_enc = keyblk; |
| mac_dec = keyblk + mac_key_len; |
| |
| /* |
| * This is not used in TLS v1.1. |
| */ |
| iv_copy_len = ( transform->fixed_ivlen ) ? |
| transform->fixed_ivlen : transform->ivlen; |
| memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len ); |
| memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len, |
| iv_copy_len ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| key1 = keyblk + mac_key_len * 2 + transform->keylen; |
| key2 = keyblk + mac_key_len * 2; |
| |
| mac_enc = keyblk + mac_key_len; |
| mac_dec = keyblk; |
| |
| /* |
| * This is not used in TLS v1.1. |
| */ |
| iv_copy_len = ( transform->fixed_ivlen ) ? |
| transform->fixed_ivlen : transform->ivlen; |
| memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len ); |
| memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len, |
| iv_copy_len ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| if( mac_key_len > sizeof transform->mac_enc ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| memcpy( transform->mac_enc, mac_enc, mac_key_len ); |
| memcpy( transform->mac_dec, mac_dec, mac_key_len ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) |
| { |
| /* For HMAC-based ciphersuites, initialize the HMAC transforms. |
| For AEAD-based ciphersuites, there is nothing to do here. */ |
| if( mac_key_len != 0 ) |
| { |
| mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len ); |
| mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len ); |
| } |
| } |
| else |
| #endif |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_init != NULL ) |
| { |
| int ret = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) ); |
| |
| if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen, |
| transform->iv_enc, transform->iv_dec, |
| iv_copy_len, |
| mac_enc, mac_dec, |
| mac_key_len ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ |
| |
| #if defined(MBEDTLS_SSL_EXPORT_KEYS) |
| if( ssl->conf->f_export_keys != NULL ) |
| { |
| ssl->conf->f_export_keys( ssl->conf->p_export_keys, |
| session->master, keyblk, |
| mac_key_len, transform->keylen, |
| iv_copy_len ); |
| } |
| #endif |
| |
| if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, |
| cipher_info ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec, |
| cipher_info ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1, |
| cipher_info->key_bitlen, |
| MBEDTLS_ENCRYPT ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2, |
| cipher_info->key_bitlen, |
| MBEDTLS_DECRYPT ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| if( cipher_info->mode == MBEDTLS_MODE_CBC ) |
| { |
| if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc, |
| MBEDTLS_PADDING_NONE ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec, |
| MBEDTLS_PADDING_NONE ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); |
| return( ret ); |
| } |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_CBC */ |
| |
| mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) ); |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| // Initialize compression |
| // |
| if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) |
| { |
| if( ssl->compress_buf == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) ); |
| ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); |
| if( ssl->compress_buf == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", |
| MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) ); |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) ); |
| |
| memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) ); |
| memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) ); |
| |
| if( deflateInit( &transform->ctx_deflate, |
| Z_DEFAULT_COMPRESSION ) != Z_OK || |
| inflateInit( &transform->ctx_inflate ) != Z_OK ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) ); |
| return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); |
| } |
| } |
| #endif /* MBEDTLS_ZLIB_SUPPORT */ |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] ) |
| { |
| mbedtls_md5_context md5; |
| mbedtls_sha1_context sha1; |
| unsigned char pad_1[48]; |
| unsigned char pad_2[48]; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); |
| |
| mbedtls_md5_init( &md5 ); |
| mbedtls_sha1_init( &sha1 ); |
| |
| mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); |
| mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); |
| |
| memset( pad_1, 0x36, 48 ); |
| memset( pad_2, 0x5C, 48 ); |
| |
| mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); |
| mbedtls_md5_update_ret( &md5, pad_1, 48 ); |
| mbedtls_md5_finish_ret( &md5, hash ); |
| |
| mbedtls_md5_starts_ret( &md5 ); |
| mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); |
| mbedtls_md5_update_ret( &md5, pad_2, 48 ); |
| mbedtls_md5_update_ret( &md5, hash, 16 ); |
| mbedtls_md5_finish_ret( &md5, hash ); |
| |
| mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); |
| mbedtls_sha1_update_ret( &sha1, pad_1, 40 ); |
| mbedtls_sha1_finish_ret( &sha1, hash + 16 ); |
| |
| mbedtls_sha1_starts_ret( &sha1 ); |
| mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); |
| mbedtls_sha1_update_ret( &sha1, pad_2, 40 ); |
| mbedtls_sha1_update_ret( &sha1, hash + 16, 20 ); |
| mbedtls_sha1_finish_ret( &sha1, hash + 16 ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); |
| |
| mbedtls_md5_free( &md5 ); |
| mbedtls_sha1_free( &sha1 ); |
| |
| return; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] ) |
| { |
| mbedtls_md5_context md5; |
| mbedtls_sha1_context sha1; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); |
| |
| mbedtls_md5_init( &md5 ); |
| mbedtls_sha1_init( &sha1 ); |
| |
| mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); |
| mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); |
| |
| mbedtls_md5_finish_ret( &md5, hash ); |
| mbedtls_sha1_finish_ret( &sha1, hash + 16 ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); |
| |
| mbedtls_md5_free( &md5 ); |
| mbedtls_sha1_free( &sha1 ); |
| |
| return; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] ) |
| { |
| mbedtls_sha256_context sha256; |
| |
| mbedtls_sha256_init( &sha256 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); |
| |
| mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); |
| mbedtls_sha256_finish_ret( &sha256, hash ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 ); |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); |
| |
| mbedtls_sha256_free( &sha256 ); |
| |
| return; |
| } |
| #endif /* MBEDTLS_SHA256_C */ |
| |
| #if defined(MBEDTLS_SHA512_C) |
| void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] ) |
| { |
| mbedtls_sha512_context sha512; |
| |
| mbedtls_sha512_init( &sha512 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); |
| |
| mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); |
| mbedtls_sha512_finish_ret( &sha512, hash ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 ); |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); |
| |
| mbedtls_sha512_free( &sha512 ); |
| |
| return; |
| } |
| #endif /* MBEDTLS_SHA512_C */ |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) |
| int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex ) |
| { |
| unsigned char *p = ssl->handshake->premaster; |
| unsigned char *end = p + sizeof( ssl->handshake->premaster ); |
| const unsigned char *psk = ssl->conf->psk; |
| size_t psk_len = ssl->conf->psk_len; |
| |
| /* If the psk callback was called, use its result */ |
| if( ssl->handshake->psk != NULL ) |
| { |
| psk = ssl->handshake->psk; |
| psk_len = ssl->handshake->psk_len; |
| } |
| |
| /* |
| * PMS = struct { |
| * opaque other_secret<0..2^16-1>; |
| * opaque psk<0..2^16-1>; |
| * }; |
| * with "other_secret" depending on the particular key exchange |
| */ |
| #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) |
| if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK ) |
| { |
| if( end - p < 2 ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| *(p++) = (unsigned char)( psk_len >> 8 ); |
| *(p++) = (unsigned char)( psk_len ); |
| |
| if( end < p || (size_t)( end - p ) < psk_len ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| memset( p, 0, psk_len ); |
| p += psk_len; |
| } |
| else |
| #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ |
| #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) |
| if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) |
| { |
| /* |
| * other_secret already set by the ClientKeyExchange message, |
| * and is 48 bytes long |
| */ |
| if( end - p < 2 ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| *p++ = 0; |
| *p++ = 48; |
| p += 48; |
| } |
| else |
| #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ |
| #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) |
| { |
| int ret; |
| size_t len; |
| |
| /* Write length only when we know the actual value */ |
| if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, |
| p + 2, end - ( p + 2 ), &len, |
| ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); |
| return( ret ); |
| } |
| *(p++) = (unsigned char)( len >> 8 ); |
| *(p++) = (unsigned char)( len ); |
| p += len; |
| |
| MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); |
| } |
| else |
| #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) |
| if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) |
| { |
| int ret; |
| size_t zlen; |
| |
| if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen, |
| p + 2, end - ( p + 2 ), |
| ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); |
| return( ret ); |
| } |
| |
| *(p++) = (unsigned char)( zlen >> 8 ); |
| *(p++) = (unsigned char)( zlen ); |
| p += zlen; |
| |
| MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, |
| MBEDTLS_DEBUG_ECDH_Z ); |
| } |
| else |
| #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* opaque psk<0..2^16-1>; */ |
| if( end - p < 2 ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| *(p++) = (unsigned char)( psk_len >> 8 ); |
| *(p++) = (unsigned char)( psk_len ); |
| |
| if( end < p || (size_t)( end - p ) < psk_len ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| memcpy( p, psk, psk_len ); |
| p += psk_len; |
| |
| ssl->handshake->pmslen = p - ssl->handshake->premaster; |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| /* |
| * SSLv3.0 MAC functions |
| */ |
| #define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ |
| static void ssl_mac( mbedtls_md_context_t *md_ctx, |
| const unsigned char *secret, |
| const unsigned char *buf, size_t len, |
| const unsigned char *ctr, int type, |
| unsigned char out[SSL_MAC_MAX_BYTES] ) |
| { |
| unsigned char header[11]; |
| unsigned char padding[48]; |
| int padlen; |
| int md_size = mbedtls_md_get_size( md_ctx->md_info ); |
| int md_type = mbedtls_md_get_type( md_ctx->md_info ); |
| |
| /* Only MD5 and SHA-1 supported */ |
| if( md_type == MBEDTLS_MD_MD5 ) |
| padlen = 48; |
| else |
| padlen = 40; |
| |
| memcpy( header, ctr, 8 ); |
| header[ 8] = (unsigned char) type; |
| header[ 9] = (unsigned char)( len >> 8 ); |
| header[10] = (unsigned char)( len ); |
| |
| memset( padding, 0x36, padlen ); |
| mbedtls_md_starts( md_ctx ); |
| mbedtls_md_update( md_ctx, secret, md_size ); |
| mbedtls_md_update( md_ctx, padding, padlen ); |
| mbedtls_md_update( md_ctx, header, 11 ); |
| mbedtls_md_update( md_ctx, buf, len ); |
| mbedtls_md_finish( md_ctx, out ); |
| |
| memset( padding, 0x5C, padlen ); |
| mbedtls_md_starts( md_ctx ); |
| mbedtls_md_update( md_ctx, secret, md_size ); |
| mbedtls_md_update( md_ctx, padding, padlen ); |
| mbedtls_md_update( md_ctx, out, md_size ); |
| mbedtls_md_finish( md_ctx, out ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| |
| #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \ |
| ( defined(MBEDTLS_CIPHER_MODE_CBC) && \ |
| ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C)) ) |
| #define SSL_SOME_MODES_USE_MAC |
| #endif |
| |
| /* The function below is only used in the Lucky 13 counter-measure in |
| * ssl_decrypt_buf(). These are the defines that guard the call site. */ |
| #if defined(SSL_SOME_MODES_USE_MAC) && \ |
| ( defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) ) |
| /* This function makes sure every byte in the memory region is accessed |
| * (in ascending addresses order) */ |
| static void ssl_read_memory( unsigned char *p, size_t len ) |
| { |
| unsigned char acc = 0; |
| volatile unsigned char force; |
| |
| for( ; len != 0; p++, len-- ) |
| acc ^= *p; |
| |
| force = acc; |
| (void) force; |
| } |
| #endif /* SSL_SOME_MODES_USE_MAC && ( TLS1 || TLS1_1 || TLS1_2 ) */ |
| |
| /* |
| * Encryption/decryption functions |
| */ |
| static int ssl_encrypt_buf( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_cipher_mode_t mode; |
| int auth_done = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) ); |
| |
| if( ssl->session_out == NULL || ssl->transform_out == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload", |
| ssl->out_msg, ssl->out_msglen ); |
| |
| /* |
| * Add MAC before if needed |
| */ |
| #if defined(SSL_SOME_MODES_USE_MAC) |
| if( mode == MBEDTLS_MODE_STREAM || |
| ( mode == MBEDTLS_MODE_CBC |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED |
| #endif |
| ) ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| unsigned char mac[SSL_MAC_MAX_BYTES]; |
| |
| ssl_mac( &ssl->transform_out->md_ctx_enc, |
| ssl->transform_out->mac_enc, |
| ssl->out_msg, ssl->out_msglen, |
| ssl->out_ctr, ssl->out_msgtype, |
| mac ); |
| |
| memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen ); |
| } |
| else |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) |
| { |
| unsigned char mac[MBEDTLS_SSL_MAC_ADD]; |
| |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 ); |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 ); |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 ); |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, |
| ssl->out_msg, ssl->out_msglen ); |
| mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac ); |
| mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc ); |
| |
| memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen ); |
| } |
| else |
| #endif |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", |
| ssl->out_msg + ssl->out_msglen, |
| ssl->transform_out->maclen ); |
| |
| ssl->out_msglen += ssl->transform_out->maclen; |
| auth_done++; |
| } |
| #endif /* AEAD not the only option */ |
| |
| /* |
| * Encrypt |
| */ |
| #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) |
| if( mode == MBEDTLS_MODE_STREAM ) |
| { |
| int ret; |
| size_t olen = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " |
| "including %d bytes of padding", |
| ssl->out_msglen, 0 ) ); |
| |
| if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc, |
| ssl->transform_out->iv_enc, |
| ssl->transform_out->ivlen, |
| ssl->out_msg, ssl->out_msglen, |
| ssl->out_msg, &olen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); |
| return( ret ); |
| } |
| |
| if( ssl->out_msglen != olen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ |
| #if defined(MBEDTLS_GCM_C) || \ |
| defined(MBEDTLS_CCM_C) || \ |
| defined(MBEDTLS_CHACHAPOLY_C) |
| if( mode == MBEDTLS_MODE_GCM || |
| mode == MBEDTLS_MODE_CCM || |
| mode == MBEDTLS_MODE_CHACHAPOLY ) |
| { |
| int ret; |
| size_t enc_msglen, olen; |
| unsigned char *enc_msg; |
| unsigned char add_data[13]; |
| unsigned char iv[12]; |
| mbedtls_ssl_transform *transform = ssl->transform_out; |
| unsigned char taglen = transform->ciphersuite_info->flags & |
| MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; |
| size_t explicit_ivlen = transform->ivlen - transform->fixed_ivlen; |
| |
| /* |
| * Prepare additional authenticated data |
| */ |
| memcpy( add_data, ssl->out_ctr, 8 ); |
| add_data[8] = ssl->out_msgtype; |
| mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, |
| ssl->conf->transport, add_data + 9 ); |
| add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF; |
| add_data[12] = ssl->out_msglen & 0xFF; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 ); |
| |
| /* |
| * Generate IV |
| */ |
| if( transform->ivlen == 12 && transform->fixed_ivlen == 4 ) |
| { |
| /* GCM and CCM: fixed || explicit (=seqnum) */ |
| memcpy( iv, transform->iv_enc, transform->fixed_ivlen ); |
| memcpy( iv + transform->fixed_ivlen, ssl->out_ctr, 8 ); |
| memcpy( ssl->out_iv, ssl->out_ctr, 8 ); |
| |
| } |
| else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 ) |
| { |
| /* ChachaPoly: fixed XOR sequence number */ |
| unsigned char i; |
| |
| memcpy( iv, transform->iv_enc, transform->fixed_ivlen ); |
| |
| for( i = 0; i < 8; i++ ) |
| iv[i+4] ^= ssl->out_ctr[i]; |
| } |
| else |
| { |
| /* Reminder if we ever add an AEAD mode with a different size */ |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (internal)", |
| iv, transform->ivlen ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (transmitted)", |
| ssl->out_iv, explicit_ivlen ); |
| |
| /* |
| * Fix message length with added IV |
| */ |
| enc_msg = ssl->out_msg; |
| enc_msglen = ssl->out_msglen; |
| ssl->out_msglen += explicit_ivlen; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " |
| "including 0 bytes of padding", |
| ssl->out_msglen ) ); |
| |
| /* |
| * Encrypt and authenticate |
| */ |
| if( ( ret = mbedtls_cipher_auth_encrypt( &transform->cipher_ctx_enc, |
| iv, transform->ivlen, |
| add_data, 13, |
| enc_msg, enc_msglen, |
| enc_msg, &olen, |
| enc_msg + enc_msglen, taglen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret ); |
| return( ret ); |
| } |
| |
| if( olen != enc_msglen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| ssl->out_msglen += taglen; |
| auth_done++; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen ); |
| } |
| else |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) && \ |
| ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) ) |
| if( mode == MBEDTLS_MODE_CBC ) |
| { |
| int ret; |
| unsigned char *enc_msg; |
| size_t enc_msglen, padlen, olen = 0, i; |
| |
| padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) % |
| ssl->transform_out->ivlen; |
| if( padlen == ssl->transform_out->ivlen ) |
| padlen = 0; |
| |
| for( i = 0; i <= padlen; i++ ) |
| ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen; |
| |
| ssl->out_msglen += padlen + 1; |
| |
| enc_msglen = ssl->out_msglen; |
| enc_msg = ssl->out_msg; |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| /* |
| * Prepend per-record IV for block cipher in TLS v1.1 and up as per |
| * Method 1 (6.2.3.2. in RFC4346 and RFC5246) |
| */ |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| /* |
| * Generate IV |
| */ |
| ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc, |
| ssl->transform_out->ivlen ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| memcpy( ssl->out_iv, ssl->transform_out->iv_enc, |
| ssl->transform_out->ivlen ); |
| |
| /* |
| * Fix pointer positions and message length with added IV |
| */ |
| enc_msg = ssl->out_msg; |
| enc_msglen = ssl->out_msglen; |
| ssl->out_msglen += ssl->transform_out->ivlen; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " |
| "including %d bytes of IV and %d bytes of padding", |
| ssl->out_msglen, ssl->transform_out->ivlen, |
| padlen + 1 ) ); |
| |
| if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc, |
| ssl->transform_out->iv_enc, |
| ssl->transform_out->ivlen, |
| enc_msg, enc_msglen, |
| enc_msg, &olen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); |
| return( ret ); |
| } |
| |
| if( enc_msglen != olen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) |
| if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| /* |
| * Save IV in SSL3 and TLS1 |
| */ |
| memcpy( ssl->transform_out->iv_enc, |
| ssl->transform_out->cipher_ctx_enc.iv, |
| ssl->transform_out->ivlen ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| if( auth_done == 0 ) |
| { |
| unsigned char mac[MBEDTLS_SSL_MAC_ADD]; |
| |
| /* |
| * MAC(MAC_write_key, seq_num + |
| * TLSCipherText.type + |
| * TLSCipherText.version + |
| * length_of( (IV +) ENC(...) ) + |
| * IV + // except for TLS 1.0 |
| * ENC(content + padding + padding_length)); |
| */ |
| unsigned char pseudo_hdr[13]; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); |
| |
| memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 ); |
| memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 ); |
| pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF ); |
| pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 ); |
| |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 ); |
| mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, |
| ssl->out_iv, ssl->out_msglen ); |
| mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac ); |
| mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc ); |
| |
| memcpy( ssl->out_iv + ssl->out_msglen, mac, |
| ssl->transform_out->maclen ); |
| |
| ssl->out_msglen += ssl->transform_out->maclen; |
| auth_done++; |
| } |
| #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ |
| } |
| else |
| #endif /* MBEDTLS_CIPHER_MODE_CBC && |
| ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* Make extra sure authentication was performed, exactly once */ |
| if( auth_done != 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) ); |
| |
| return( 0 ); |
| } |
| |
| static int ssl_decrypt_buf( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_cipher_mode_t mode; |
| int auth_done = 0; |
| #if defined(SSL_SOME_MODES_USE_MAC) |
| size_t padlen = 0, correct = 1; |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) ); |
| |
| if( ssl->session_in == NULL || ssl->transform_in == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec ); |
| |
| if( ssl->in_msglen < ssl->transform_in->minlen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)", |
| ssl->in_msglen, ssl->transform_in->minlen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| |
| #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) |
| if( mode == MBEDTLS_MODE_STREAM ) |
| { |
| int ret; |
| size_t olen = 0; |
| |
| padlen = 0; |
| |
| if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec, |
| ssl->transform_in->iv_dec, |
| ssl->transform_in->ivlen, |
| ssl->in_msg, ssl->in_msglen, |
| ssl->in_msg, &olen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); |
| return( ret ); |
| } |
| |
| if( ssl->in_msglen != olen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ |
| #if defined(MBEDTLS_GCM_C) || \ |
| defined(MBEDTLS_CCM_C) || \ |
| defined(MBEDTLS_CHACHAPOLY_C) |
| if( mode == MBEDTLS_MODE_GCM || |
| mode == MBEDTLS_MODE_CCM || |
| mode == MBEDTLS_MODE_CHACHAPOLY ) |
| { |
| int ret; |
| size_t dec_msglen, olen; |
| unsigned char *dec_msg; |
| unsigned char *dec_msg_result; |
| unsigned char add_data[13]; |
| unsigned char iv[12]; |
| mbedtls_ssl_transform *transform = ssl->transform_in; |
| unsigned char taglen = transform->ciphersuite_info->flags & |
| MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; |
| size_t explicit_iv_len = transform->ivlen - transform->fixed_ivlen; |
| |
| /* |
| * Compute and update sizes |
| */ |
| if( ssl->in_msglen < explicit_iv_len + taglen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) " |
| "+ taglen (%d)", ssl->in_msglen, |
| explicit_iv_len, taglen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| dec_msglen = ssl->in_msglen - explicit_iv_len - taglen; |
| |
| dec_msg = ssl->in_msg; |
| dec_msg_result = ssl->in_msg; |
| ssl->in_msglen = dec_msglen; |
| |
| /* |
| * Prepare additional authenticated data |
| */ |
| memcpy( add_data, ssl->in_ctr, 8 ); |
| add_data[8] = ssl->in_msgtype; |
| mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, |
| ssl->conf->transport, add_data + 9 ); |
| add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF; |
| add_data[12] = ssl->in_msglen & 0xFF; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 ); |
| |
| /* |
| * Prepare IV |
| */ |
| if( transform->ivlen == 12 && transform->fixed_ivlen == 4 ) |
| { |
| /* GCM and CCM: fixed || explicit (transmitted) */ |
| memcpy( iv, transform->iv_dec, transform->fixed_ivlen ); |
| memcpy( iv + transform->fixed_ivlen, ssl->in_iv, 8 ); |
| |
| } |
| else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 ) |
| { |
| /* ChachaPoly: fixed XOR sequence number */ |
| unsigned char i; |
| |
| memcpy( iv, transform->iv_dec, transform->fixed_ivlen ); |
| |
| for( i = 0; i < 8; i++ ) |
| iv[i+4] ^= ssl->in_ctr[i]; |
| } |
| else |
| { |
| /* Reminder if we ever add an AEAD mode with a different size */ |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", iv, transform->ivlen ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen ); |
| |
| /* |
| * Decrypt and authenticate |
| */ |
| if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec, |
| iv, transform->ivlen, |
| add_data, 13, |
| dec_msg, dec_msglen, |
| dec_msg_result, &olen, |
| dec_msg + dec_msglen, taglen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret ); |
| |
| if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED ) |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| |
| return( ret ); |
| } |
| auth_done++; |
| |
| if( olen != dec_msglen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) && \ |
| ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) ) |
| if( mode == MBEDTLS_MODE_CBC ) |
| { |
| /* |
| * Decrypt and check the padding |
| */ |
| int ret; |
| unsigned char *dec_msg; |
| unsigned char *dec_msg_result; |
| size_t dec_msglen; |
| size_t minlen = 0; |
| size_t olen = 0; |
| |
| /* |
| * Check immediate ciphertext sanity |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| minlen += ssl->transform_in->ivlen; |
| #endif |
| |
| if( ssl->in_msglen < minlen + ssl->transform_in->ivlen || |
| ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) " |
| "+ 1 ) ( + expl IV )", ssl->in_msglen, |
| ssl->transform_in->ivlen, |
| ssl->transform_in->maclen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| |
| dec_msglen = ssl->in_msglen; |
| dec_msg = ssl->in_msg; |
| dec_msg_result = ssl->in_msg; |
| |
| /* |
| * Authenticate before decrypt if enabled |
| */ |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) |
| { |
| unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; |
| unsigned char pseudo_hdr[13]; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); |
| |
| dec_msglen -= ssl->transform_in->maclen; |
| ssl->in_msglen -= ssl->transform_in->maclen; |
| |
| memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 ); |
| memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 ); |
| pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF ); |
| pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 ); |
| |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 ); |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, |
| ssl->in_iv, ssl->in_msglen ); |
| mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect ); |
| mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen, |
| ssl->transform_in->maclen ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, |
| ssl->transform_in->maclen ); |
| |
| if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect, |
| ssl->transform_in->maclen ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); |
| |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| auth_done++; |
| } |
| #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ |
| |
| /* |
| * Check length sanity |
| */ |
| if( ssl->in_msglen % ssl->transform_in->ivlen != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0", |
| ssl->in_msglen, ssl->transform_in->ivlen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| /* |
| * Initialize for prepended IV for block cipher in TLS v1.1 and up |
| */ |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| unsigned char i; |
| dec_msglen -= ssl->transform_in->ivlen; |
| ssl->in_msglen -= ssl->transform_in->ivlen; |
| |
| for( i = 0; i < ssl->transform_in->ivlen; i++ ) |
| ssl->transform_in->iv_dec[i] = ssl->in_iv[i]; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec, |
| ssl->transform_in->iv_dec, |
| ssl->transform_in->ivlen, |
| dec_msg, dec_msglen, |
| dec_msg_result, &olen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); |
| return( ret ); |
| } |
| |
| if( dec_msglen != olen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) |
| if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| /* |
| * Save IV in SSL3 and TLS1 |
| */ |
| memcpy( ssl->transform_in->iv_dec, |
| ssl->transform_in->cipher_ctx_dec.iv, |
| ssl->transform_in->ivlen ); |
| } |
| #endif |
| |
| padlen = 1 + ssl->in_msg[ssl->in_msglen - 1]; |
| |
| if( ssl->in_msglen < ssl->transform_in->maclen + padlen && |
| auth_done == 0 ) |
| { |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)", |
| ssl->in_msglen, ssl->transform_in->maclen, padlen ) ); |
| #endif |
| padlen = 0; |
| correct = 0; |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| if( padlen > ssl->transform_in->ivlen ) |
| { |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, " |
| "should be no more than %d", |
| padlen, ssl->transform_in->ivlen ) ); |
| #endif |
| correct = 0; |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| /* |
| * TLSv1+: always check the padding up to the first failure |
| * and fake check up to 256 bytes of padding |
| */ |
| size_t pad_count = 0, real_count = 1; |
| size_t padding_idx = ssl->in_msglen - padlen; |
| size_t i; |
| |
| /* |
| * Padding is guaranteed to be incorrect if: |
| * 1. padlen > ssl->in_msglen |
| * |
| * 2. padding_idx > MBEDTLS_SSL_IN_CONTENT_LEN + |
| * ssl->transform_in->maclen |
| * |
| * In both cases we reset padding_idx to a safe value (0) to |
| * prevent out-of-buffer reads. |
| */ |
| correct &= ( padlen <= ssl->in_msglen ); |
| correct &= ( padding_idx <= MBEDTLS_SSL_IN_CONTENT_LEN + |
| ssl->transform_in->maclen ); |
| |
| padding_idx *= correct; |
| |
| for( i = 0; i < 256; i++ ) |
| { |
| real_count &= ( i < padlen ); |
| pad_count += real_count * |
| ( ssl->in_msg[padding_idx + i] == padlen - 1 ); |
| } |
| |
| correct &= ( pad_count == padlen ); /* Only 1 on correct padding */ |
| |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| if( padlen > 0 && correct == 0 ) |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) ); |
| #endif |
| padlen &= correct * 0x1FF; |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ |
| MBEDTLS_SSL_PROTO_TLS1_2 */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| ssl->in_msglen -= padlen; |
| } |
| else |
| #endif /* MBEDTLS_CIPHER_MODE_CBC && |
| ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption", |
| ssl->in_msg, ssl->in_msglen ); |
| #endif |
| |
| /* |
| * Authenticate if not done yet. |
| * Compute the MAC regardless of the padding result (RFC4346, CBCTIME). |
| */ |
| #if defined(SSL_SOME_MODES_USE_MAC) |
| if( auth_done == 0 ) |
| { |
| unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; |
| |
| ssl->in_msglen -= ssl->transform_in->maclen; |
| |
| ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 ); |
| ssl->in_len[1] = (unsigned char)( ssl->in_msglen ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| ssl_mac( &ssl->transform_in->md_ctx_dec, |
| ssl->transform_in->mac_dec, |
| ssl->in_msg, ssl->in_msglen, |
| ssl->in_ctr, ssl->in_msgtype, |
| mac_expect ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| /* |
| * Process MAC and always update for padlen afterwards to make |
| * total time independent of padlen. |
| * |
| * Known timing attacks: |
| * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf) |
| * |
| * To compensate for different timings for the MAC calculation |
| * depending on how much padding was removed (which is determined |
| * by padlen), process extra_run more blocks through the hash |
| * function. |
| * |
| * The formula in the paper is |
| * extra_run = ceil( (L1-55) / 64 ) - ceil( (L2-55) / 64 ) |
| * where L1 is the size of the header plus the decrypted message |
| * plus CBC padding and L2 is the size of the header plus the |
| * decrypted message. This is for an underlying hash function |
| * with 64-byte blocks. |
| * We use ( (Lx+8) / 64 ) to handle 'negative Lx' values |
| * correctly. We round down instead of up, so -56 is the correct |
| * value for our calculations instead of -55. |
| * |
| * Repeat the formula rather than defining a block_size variable. |
| * This avoids requiring division by a variable at runtime |
| * (which would be marginally less efficient and would require |
| * linking an extra division function in some builds). |
| */ |
| size_t j, extra_run = 0; |
| |
| /* |
| * The next two sizes are the minimum and maximum values of |
| * in_msglen over all padlen values. |
| * |
| * They're independent of padlen, since we previously did |
| * in_msglen -= padlen. |
| * |
| * Note that max_len + maclen is never more than the buffer |
| * length, as we previously did in_msglen -= maclen too. |
| */ |
| const size_t max_len = ssl->in_msglen + padlen; |
| const size_t min_len = ( max_len > 256 ) ? max_len - 256 : 0; |
| |
| switch( ssl->transform_in->ciphersuite_info->mac ) |
| { |
| #if defined(MBEDTLS_MD5_C) || defined(MBEDTLS_SHA1_C) || \ |
| defined(MBEDTLS_SHA256_C) |
| case MBEDTLS_MD_MD5: |
| case MBEDTLS_MD_SHA1: |
| case MBEDTLS_MD_SHA256: |
| /* 8 bytes of message size, 64-byte compression blocks */ |
| extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 - |
| ( 13 + ssl->in_msglen + 8 ) / 64; |
| break; |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| case MBEDTLS_MD_SHA384: |
| /* 16 bytes of message size, 128-byte compression blocks */ |
| extra_run = ( 13 + ssl->in_msglen + padlen + 16 ) / 128 - |
| ( 13 + ssl->in_msglen + 16 ) / 128; |
| break; |
| #endif |
| default: |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| extra_run &= correct * 0xFF; |
| |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 ); |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 ); |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 ); |
| mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg, |
| ssl->in_msglen ); |
| /* Make sure we access everything even when padlen > 0. This |
| * makes the synchronisation requirements for just-in-time |
| * Prime+Probe attacks much tighter and hopefully impractical. */ |
| ssl_read_memory( ssl->in_msg + ssl->in_msglen, padlen ); |
| mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect ); |
| |
| /* Call mbedtls_md_process at least once due to cache attacks |
| * that observe whether md_process() was called of not */ |
| for( j = 0; j < extra_run + 1; j++ ) |
| mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg ); |
| |
| mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec ); |
| |
| /* Make sure we access all the memory that could contain the MAC, |
| * before we check it in the next code block. This makes the |
| * synchronisation requirements for just-in-time Prime+Probe |
| * attacks much tighter and hopefully impractical. */ |
| ssl_read_memory( ssl->in_msg + min_len, |
| max_len - min_len + ssl->transform_in->maclen ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ |
| MBEDTLS_SSL_PROTO_TLS1_2 */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen, |
| ssl->transform_in->maclen ); |
| #endif |
| |
| if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect, |
| ssl->transform_in->maclen ) != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_DEBUG_ALL) |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); |
| #endif |
| correct = 0; |
| } |
| auth_done++; |
| } |
| |
| /* |
| * Finally check the correct flag |
| */ |
| if( correct == 0 ) |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| #endif /* SSL_SOME_MODES_USE_MAC */ |
| |
| /* Make extra sure authentication was performed, exactly once */ |
| if( auth_done != 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| if( ssl->in_msglen == 0 ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 |
| && ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) |
| { |
| /* TLS v1.2 explicitly disallows zero-length messages which are not application data */ |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| ssl->nb_zero++; |
| |
| /* |
| * Three or more empty messages may be a DoS attack |
| * (excessive CPU consumption). |
| */ |
| if( ssl->nb_zero > 3 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty " |
| "messages, possible DoS attack" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| } |
| else |
| ssl->nb_zero = 0; |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ; /* in_ctr read from peer, not maintained internally */ |
| } |
| else |
| #endif |
| { |
| unsigned char i; |
| for( i = 8; i > ssl_ep_len( ssl ); i-- ) |
| if( ++ssl->in_ctr[i - 1] != 0 ) |
| break; |
| |
| /* The loop goes to its end iff the counter is wrapping */ |
| if( i == ssl_ep_len( ssl ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) ); |
| return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) ); |
| |
| return( 0 ); |
| } |
| |
| #undef MAC_NONE |
| #undef MAC_PLAINTEXT |
| #undef MAC_CIPHERTEXT |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| /* |
| * Compression/decompression functions |
| */ |
| static int ssl_compress_buf( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| unsigned char *msg_post = ssl->out_msg; |
| ptrdiff_t bytes_written = ssl->out_msg - ssl->out_buf; |
| size_t len_pre = ssl->out_msglen; |
| unsigned char *msg_pre = ssl->compress_buf; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) ); |
| |
| if( len_pre == 0 ) |
| return( 0 ); |
| |
| memcpy( msg_pre, ssl->out_msg, len_pre ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ", |
| ssl->out_msglen ) ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload", |
| ssl->out_msg, ssl->out_msglen ); |
| |
| ssl->transform_out->ctx_deflate.next_in = msg_pre; |
| ssl->transform_out->ctx_deflate.avail_in = len_pre; |
| ssl->transform_out->ctx_deflate.next_out = msg_post; |
| ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_OUT_BUFFER_LEN - bytes_written; |
| |
| ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH ); |
| if( ret != Z_OK ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) ); |
| return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); |
| } |
| |
| ssl->out_msglen = MBEDTLS_SSL_OUT_BUFFER_LEN - |
| ssl->transform_out->ctx_deflate.avail_out - bytes_written; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ", |
| ssl->out_msglen ) ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload", |
| ssl->out_msg, ssl->out_msglen ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) ); |
| |
| return( 0 ); |
| } |
| |
| static int ssl_decompress_buf( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| unsigned char *msg_post = ssl->in_msg; |
| ptrdiff_t header_bytes = ssl->in_msg - ssl->in_buf; |
| size_t len_pre = ssl->in_msglen; |
| unsigned char *msg_pre = ssl->compress_buf; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) ); |
| |
| if( len_pre == 0 ) |
| return( 0 ); |
| |
| memcpy( msg_pre, ssl->in_msg, len_pre ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ", |
| ssl->in_msglen ) ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload", |
| ssl->in_msg, ssl->in_msglen ); |
| |
| ssl->transform_in->ctx_inflate.next_in = msg_pre; |
| ssl->transform_in->ctx_inflate.avail_in = len_pre; |
| ssl->transform_in->ctx_inflate.next_out = msg_post; |
| ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_IN_BUFFER_LEN - |
| header_bytes; |
| |
| ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH ); |
| if( ret != Z_OK ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) ); |
| return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); |
| } |
| |
| ssl->in_msglen = MBEDTLS_SSL_IN_BUFFER_LEN - |
| ssl->transform_in->ctx_inflate.avail_out - header_bytes; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ", |
| ssl->in_msglen ) ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload", |
| ssl->in_msg, ssl->in_msglen ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) ); |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_ZLIB_SUPPORT */ |
| |
| #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) |
| static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| static int ssl_resend_hello_request( mbedtls_ssl_context *ssl ) |
| { |
| /* If renegotiation is not enforced, retransmit until we would reach max |
| * timeout if we were using the usual handshake doubling scheme */ |
| if( ssl->conf->renego_max_records < 0 ) |
| { |
| uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; |
| unsigned char doublings = 1; |
| |
| while( ratio != 0 ) |
| { |
| ++doublings; |
| ratio >>= 1; |
| } |
| |
| if( ++ssl->renego_records_seen > doublings ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) ); |
| return( 0 ); |
| } |
| } |
| |
| return( ssl_write_hello_request( ssl ) ); |
| } |
| #endif |
| #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ |
| |
| /* |
| * Fill the input message buffer by appending data to it. |
| * The amount of data already fetched is in ssl->in_left. |
| * |
| * If we return 0, is it guaranteed that (at least) nb_want bytes are |
| * available (from this read and/or a previous one). Otherwise, an error code |
| * is returned (possibly EOF or WANT_READ). |
| * |
| * With stream transport (TLS) on success ssl->in_left == nb_want, but |
| * with datagram transport (DTLS) on success ssl->in_left >= nb_want, |
| * since we always read a whole datagram at once. |
| * |
| * For DTLS, it is up to the caller to set ssl->next_record_offset when |
| * they're done reading a record. |
| */ |
| int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want ) |
| { |
| int ret; |
| size_t len; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) ); |
| |
| if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " |
| "or mbedtls_ssl_set_bio()" ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| if( nb_want > MBEDTLS_SSL_IN_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| uint32_t timeout; |
| |
| /* Just to be sure */ |
| if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use " |
| "mbedtls_ssl_set_timer_cb() for DTLS" ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| /* |
| * The point is, we need to always read a full datagram at once, so we |
| * sometimes read more then requested, and handle the additional data. |
| * It could be the rest of the current record (while fetching the |
| * header) and/or some other records in the same datagram. |
| */ |
| |
| /* |
| * Move to the next record in the already read datagram if applicable |
| */ |
| if( ssl->next_record_offset != 0 ) |
| { |
| if( ssl->in_left < ssl->next_record_offset ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| ssl->in_left -= ssl->next_record_offset; |
| |
| if( ssl->in_left != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d", |
| ssl->next_record_offset ) ); |
| memmove( ssl->in_hdr, |
| ssl->in_hdr + ssl->next_record_offset, |
| ssl->in_left ); |
| } |
| |
| ssl->next_record_offset = 0; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", |
| ssl->in_left, nb_want ) ); |
| |
| /* |
| * Done if we already have enough data. |
| */ |
| if( nb_want <= ssl->in_left) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); |
| return( 0 ); |
| } |
| |
| /* |
| * A record can't be split across datagrams. If we need to read but |
| * are not at the beginning of a new record, the caller did something |
| * wrong. |
| */ |
| if( ssl->in_left != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* |
| * Don't even try to read if time's out already. |
| * This avoids by-passing the timer when repeatedly receiving messages |
| * that will end up being dropped. |
| */ |
| if( ssl_check_timer( ssl ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "timer has expired" ) ); |
| ret = MBEDTLS_ERR_SSL_TIMEOUT; |
| } |
| else |
| { |
| len = MBEDTLS_SSL_IN_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf ); |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| timeout = ssl->handshake->retransmit_timeout; |
| else |
| timeout = ssl->conf->read_timeout; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) ); |
| |
| if( ssl->f_recv_timeout != NULL ) |
| ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len, |
| timeout ); |
| else |
| ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len ); |
| |
| MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); |
| |
| if( ret == 0 ) |
| return( MBEDTLS_ERR_SSL_CONN_EOF ); |
| } |
| |
| if( ret == MBEDTLS_ERR_SSL_TIMEOUT ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) ); |
| ssl_set_timer( ssl, 0 ); |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| if( ssl_double_retransmit_timeout( ssl ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) ); |
| return( MBEDTLS_ERR_SSL_TIMEOUT ); |
| } |
| |
| if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); |
| return( ret ); |
| } |
| |
| return( MBEDTLS_ERR_SSL_WANT_READ ); |
| } |
| #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) |
| else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) |
| { |
| if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret ); |
| return( ret ); |
| } |
| |
| return( MBEDTLS_ERR_SSL_WANT_READ ); |
| } |
| #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ |
| } |
| |
| if( ret < 0 ) |
| return( ret ); |
| |
| ssl->in_left = ret; |
| } |
| else |
| #endif |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", |
| ssl->in_left, nb_want ) ); |
| |
| while( ssl->in_left < nb_want ) |
| { |
| len = nb_want - ssl->in_left; |
| |
| if( ssl_check_timer( ssl ) != 0 ) |
| ret = MBEDTLS_ERR_SSL_TIMEOUT; |
| else |
| { |
| if( ssl->f_recv_timeout != NULL ) |
| { |
| ret = ssl->f_recv_timeout( ssl->p_bio, |
| ssl->in_hdr + ssl->in_left, len, |
| ssl->conf->read_timeout ); |
| } |
| else |
| { |
| ret = ssl->f_recv( ssl->p_bio, |
| ssl->in_hdr + ssl->in_left, len ); |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", |
| ssl->in_left, nb_want ) ); |
| MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); |
| |
| if( ret == 0 ) |
| return( MBEDTLS_ERR_SSL_CONN_EOF ); |
| |
| if( ret < 0 ) |
| return( ret ); |
| |
| if ( (size_t)ret > len || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, |
| ( "f_recv returned %d bytes but only %lu were requested", |
| ret, (unsigned long)len ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| ssl->in_left += ret; |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Flush any data not yet written |
| */ |
| int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| unsigned char *buf; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) ); |
| |
| if( ssl->f_send == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " |
| "or mbedtls_ssl_set_bio()" ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| /* Avoid incrementing counter if data is flushed */ |
| if( ssl->out_left == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); |
| return( 0 ); |
| } |
| |
| while( ssl->out_left > 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d", |
| mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) ); |
| |
| buf = ssl->out_hdr - ssl->out_left; |
| ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left ); |
| |
| MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret ); |
| |
| if( ret <= 0 ) |
| return( ret ); |
| |
| if( (size_t)ret > ssl->out_left || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, |
| ( "f_send returned %d bytes but only %lu bytes were sent", |
| ret, (unsigned long)ssl->out_left ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| ssl->out_left -= ret; |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->out_hdr = ssl->out_buf; |
| } |
| else |
| #endif |
| { |
| ssl->out_hdr = ssl->out_buf + 8; |
| } |
| ssl_update_out_pointers( ssl, ssl->transform_out ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Functions to handle the DTLS retransmission state machine |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| /* |
| * Append current handshake message to current outgoing flight |
| */ |
| static int ssl_flight_append( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_flight_item *msg; |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_flight_append" ) ); |
| MBEDTLS_SSL_DEBUG_BUF( 4, "message appended to flight", |
| ssl->out_msg, ssl->out_msglen ); |
| |
| /* Allocate space for current message */ |
| if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", |
| sizeof( mbedtls_ssl_flight_item ) ) ); |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| |
| if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) ); |
| mbedtls_free( msg ); |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| |
| /* Copy current handshake message with headers */ |
| memcpy( msg->p, ssl->out_msg, ssl->out_msglen ); |
| msg->len = ssl->out_msglen; |
| msg->type = ssl->out_msgtype; |
| msg->next = NULL; |
| |
| /* Append to the current flight */ |
| if( ssl->handshake->flight == NULL ) |
| ssl->handshake->flight = msg; |
| else |
| { |
| mbedtls_ssl_flight_item *cur = ssl->handshake->flight; |
| while( cur->next != NULL ) |
| cur = cur->next; |
| cur->next = msg; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_flight_append" ) ); |
| return( 0 ); |
| } |
| |
| /* |
| * Free the current flight of handshake messages |
| */ |
| static void ssl_flight_free( mbedtls_ssl_flight_item *flight ) |
| { |
| mbedtls_ssl_flight_item *cur = flight; |
| mbedtls_ssl_flight_item *next; |
| |
| while( cur != NULL ) |
| { |
| next = cur->next; |
| |
| mbedtls_free( cur->p ); |
| mbedtls_free( cur ); |
| |
| cur = next; |
| } |
| } |
| |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl ); |
| #endif |
| |
| /* |
| * Swap transform_out and out_ctr with the alternative ones |
| */ |
| static void ssl_swap_epochs( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_transform *tmp_transform; |
| unsigned char tmp_out_ctr[8]; |
| |
| if( ssl->transform_out == ssl->handshake->alt_transform_out ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) ); |
| return; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) ); |
| |
| /* Swap transforms */ |
| tmp_transform = ssl->transform_out; |
| ssl->transform_out = ssl->handshake->alt_transform_out; |
| ssl->handshake->alt_transform_out = tmp_transform; |
| |
| /* Swap epoch + sequence_number */ |
| memcpy( tmp_out_ctr, ssl->cur_out_ctr, 8 ); |
| memcpy( ssl->cur_out_ctr, ssl->handshake->alt_out_ctr, 8 ); |
| memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 ); |
| |
| /* Adjust to the newly activated transform */ |
| ssl_update_out_pointers( ssl, ssl->transform_out ); |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_activate != NULL ) |
| { |
| if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| } |
| #endif |
| } |
| |
| /* |
| * Retransmit the current flight of messages. |
| */ |
| int mbedtls_ssl_resend( mbedtls_ssl_context *ssl ) |
| { |
| int ret = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) ); |
| |
| ret = mbedtls_ssl_flight_transmit( ssl ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) ); |
| |
| return( ret ); |
| } |
| |
| /* |
| * Transmit or retransmit the current flight of messages. |
| * |
| * Need to remember the current message in case flush_output returns |
| * WANT_WRITE, causing us to exit this function and come back later. |
| * This function must be called until state is no longer SENDING. |
| */ |
| int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_flight_transmit" ) ); |
| |
| if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise flight transmission" ) ); |
| |
| ssl->handshake->cur_msg = ssl->handshake->flight; |
| ssl->handshake->cur_msg_p = ssl->handshake->flight->p + 12; |
| ssl_swap_epochs( ssl ); |
| |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING; |
| } |
| |
| while( ssl->handshake->cur_msg != NULL ) |
| { |
| size_t max_frag_len; |
| const mbedtls_ssl_flight_item * const cur = ssl->handshake->cur_msg; |
| |
| int const is_finished = |
| ( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE && |
| cur->p[0] == MBEDTLS_SSL_HS_FINISHED ); |
| |
| uint8_t const force_flush = ssl->disable_datagram_packing == 1 ? |
| SSL_FORCE_FLUSH : SSL_DONT_FORCE_FLUSH; |
| |
| /* Swap epochs before sending Finished: we can't do it after |
| * sending ChangeCipherSpec, in case write returns WANT_READ. |
| * Must be done before copying, may change out_msg pointer */ |
| if( is_finished && ssl->handshake->cur_msg_p == ( cur->p + 12 ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "swap epochs to send finished message" ) ); |
| ssl_swap_epochs( ssl ); |
| } |
| |
| ret = ssl_get_remaining_payload_in_datagram( ssl ); |
| if( ret < 0 ) |
| return( ret ); |
| max_frag_len = (size_t) ret; |
| |
| /* CCS is copied as is, while HS messages may need fragmentation */ |
| if( cur->type == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) |
| { |
| if( max_frag_len == 0 ) |
| { |
| if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| return( ret ); |
| |
| continue; |
| } |
| |
| memcpy( ssl->out_msg, cur->p, cur->len ); |
| ssl->out_msglen = cur->len; |
| ssl->out_msgtype = cur->type; |
| |
| /* Update position inside current message */ |
| ssl->handshake->cur_msg_p += cur->len; |
| } |
| else |
| { |
| const unsigned char * const p = ssl->handshake->cur_msg_p; |
| const size_t hs_len = cur->len - 12; |
| const size_t frag_off = p - ( cur->p + 12 ); |
| const size_t rem_len = hs_len - frag_off; |
| size_t cur_hs_frag_len, max_hs_frag_len; |
| |
| if( ( max_frag_len < 12 ) || ( max_frag_len == 12 && hs_len != 0 ) ) |
| { |
| if( is_finished ) |
| ssl_swap_epochs( ssl ); |
| |
| if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| return( ret ); |
| |
| continue; |
| } |
| max_hs_frag_len = max_frag_len - 12; |
| |
| cur_hs_frag_len = rem_len > max_hs_frag_len ? |
| max_hs_frag_len : rem_len; |
| |
| if( frag_off == 0 && cur_hs_frag_len != hs_len ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "fragmenting handshake message (%u > %u)", |
| (unsigned) cur_hs_frag_len, |
| (unsigned) max_hs_frag_len ) ); |
| } |
| |
| /* Messages are stored with handshake headers as if not fragmented, |
| * copy beginning of headers then fill fragmentation fields. |
| * Handshake headers: type(1) len(3) seq(2) f_off(3) f_len(3) */ |
| memcpy( ssl->out_msg, cur->p, 6 ); |
| |
| ssl->out_msg[6] = ( ( frag_off >> 16 ) & 0xff ); |
| ssl->out_msg[7] = ( ( frag_off >> 8 ) & 0xff ); |
| ssl->out_msg[8] = ( ( frag_off ) & 0xff ); |
| |
| ssl->out_msg[ 9] = ( ( cur_hs_frag_len >> 16 ) & 0xff ); |
| ssl->out_msg[10] = ( ( cur_hs_frag_len >> 8 ) & 0xff ); |
| ssl->out_msg[11] = ( ( cur_hs_frag_len ) & 0xff ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "handshake header", ssl->out_msg, 12 ); |
| |
| /* Copy the handshake message content and set records fields */ |
| memcpy( ssl->out_msg + 12, p, cur_hs_frag_len ); |
| ssl->out_msglen = cur_hs_frag_len + 12; |
| ssl->out_msgtype = cur->type; |
| |
| /* Update position inside current message */ |
| ssl->handshake->cur_msg_p += cur_hs_frag_len; |
| } |
| |
| /* If done with the current message move to the next one if any */ |
| if( ssl->handshake->cur_msg_p >= cur->p + cur->len ) |
| { |
| if( cur->next != NULL ) |
| { |
| ssl->handshake->cur_msg = cur->next; |
| ssl->handshake->cur_msg_p = cur->next->p + 12; |
| } |
| else |
| { |
| ssl->handshake->cur_msg = NULL; |
| ssl->handshake->cur_msg_p = NULL; |
| } |
| } |
| |
| /* Actually send the message out */ |
| if( ( ret = mbedtls_ssl_write_record( ssl, force_flush ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); |
| return( ret ); |
| } |
| } |
| |
| if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| return( ret ); |
| |
| /* Update state and set timer */ |
| if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; |
| else |
| { |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; |
| ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_flight_transmit" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * To be called when the last message of an incoming flight is received. |
| */ |
| void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl ) |
| { |
| /* We won't need to resend that one any more */ |
| ssl_flight_free( ssl->handshake->flight ); |
| ssl->handshake->flight = NULL; |
| ssl->handshake->cur_msg = NULL; |
| |
| /* The next incoming flight will start with this msg_seq */ |
| ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq; |
| |
| /* We don't want to remember CCS's across flight boundaries. */ |
| ssl->handshake->buffering.seen_ccs = 0; |
| |
| /* Clear future message buffering structure. */ |
| ssl_buffering_free( ssl ); |
| |
| /* Cancel timer */ |
| ssl_set_timer( ssl, 0 ); |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) |
| { |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; |
| } |
| else |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; |
| } |
| |
| /* |
| * To be called when the last message of an outgoing flight is send. |
| */ |
| void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl ) |
| { |
| ssl_reset_retransmit_timeout( ssl ); |
| ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) |
| { |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; |
| } |
| else |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| /* |
| * Handshake layer functions |
| */ |
| |
| /* |
| * Write (DTLS: or queue) current handshake (including CCS) message. |
| * |
| * - fill in handshake headers |
| * - update handshake checksum |
| * - DTLS: save message for resending |
| * - then pass to the record layer |
| * |
| * DTLS: except for HelloRequest, messages are only queued, and will only be |
| * actually sent when calling flight_transmit() or resend(). |
| * |
| * Inputs: |
| * - ssl->out_msglen: 4 + actual handshake message len |
| * (4 is the size of handshake headers for TLS) |
| * - ssl->out_msg[0]: the handshake type (ClientHello, ServerHello, etc) |
| * - ssl->out_msg + 4: the handshake message body |
| * |
| * Outputs, ie state before passing to flight_append() or write_record(): |
| * - ssl->out_msglen: the length of the record contents |
| * (including handshake headers but excluding record headers) |
| * - ssl->out_msg: the record contents (handshake headers + content) |
| */ |
| int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| const size_t hs_len = ssl->out_msglen - 4; |
| const unsigned char hs_type = ssl->out_msg[0]; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write handshake message" ) ); |
| |
| /* |
| * Sanity checks |
| */ |
| if( ssl->out_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->out_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) |
| { |
| /* In SSLv3, the client might send a NoCertificate alert. */ |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) |
| if( ! ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && |
| ssl->out_msgtype == MBEDTLS_SSL_MSG_ALERT && |
| ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) ) |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| |
| /* Whenever we send anything different from a |
| * HelloRequest we should be in a handshake - double check. */ |
| if( ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) && |
| ssl->handshake == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->handshake != NULL && |
| ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| #endif |
| |
| /* Double-check that we did not exceed the bounds |
| * of the outgoing record buffer. |
| * This should never fail as the various message |
| * writing functions must obey the bounds of the |
| * outgoing record buffer, but better be safe. |
| * |
| * Note: We deliberately do not check for the MTU or MFL here. |
| */ |
| if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record too large: " |
| "size %u, maximum %u", |
| (unsigned) ssl->out_msglen, |
| (unsigned) MBEDTLS_SSL_OUT_CONTENT_LEN ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* |
| * Fill handshake headers |
| */ |
| if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) |
| { |
| ssl->out_msg[1] = (unsigned char)( hs_len >> 16 ); |
| ssl->out_msg[2] = (unsigned char)( hs_len >> 8 ); |
| ssl->out_msg[3] = (unsigned char)( hs_len ); |
| |
| /* |
| * DTLS has additional fields in the Handshake layer, |
| * between the length field and the actual payload: |
| * uint16 message_seq; |
| * uint24 fragment_offset; |
| * uint24 fragment_length; |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| /* Make room for the additional DTLS fields */ |
| if( MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen < 8 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: " |
| "size %u, maximum %u", |
| (unsigned) ( hs_len ), |
| (unsigned) ( MBEDTLS_SSL_OUT_CONTENT_LEN - 12 ) ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| memmove( ssl->out_msg + 12, ssl->out_msg + 4, hs_len ); |
| ssl->out_msglen += 8; |
| |
| /* Write message_seq and update it, except for HelloRequest */ |
| if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) |
| { |
| ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF; |
| ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF; |
| ++( ssl->handshake->out_msg_seq ); |
| } |
| else |
| { |
| ssl->out_msg[4] = 0; |
| ssl->out_msg[5] = 0; |
| } |
| |
| /* Handshake hashes are computed without fragmentation, |
| * so set frag_offset = 0 and frag_len = hs_len for now */ |
| memset( ssl->out_msg + 6, 0x00, 3 ); |
| memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| /* Update running hashes of handshake messages seen */ |
| if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) |
| ssl->handshake->update_checksum( ssl, ssl->out_msg, ssl->out_msglen ); |
| } |
| |
| /* Either send now, or just save to be sent (and resent) later */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) ) |
| { |
| if( ( ret = ssl_flight_append( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret ); |
| return( ret ); |
| } |
| } |
| else |
| #endif |
| { |
| if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_record", ret ); |
| return( ret ); |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write handshake message" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Record layer functions |
| */ |
| |
| /* |
| * Write current record. |
| * |
| * Uses: |
| * - ssl->out_msgtype: type of the message (AppData, Handshake, Alert, CCS) |
| * - ssl->out_msglen: length of the record content (excl headers) |
| * - ssl->out_msg: record content |
| */ |
| int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush ) |
| { |
| int ret, done = 0; |
| size_t len = ssl->out_msglen; |
| uint8_t flush = force_flush; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) ); |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| if( ssl->transform_out != NULL && |
| ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) |
| { |
| if( ( ret = ssl_compress_buf( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret ); |
| return( ret ); |
| } |
| |
| len = ssl->out_msglen; |
| } |
| #endif /*MBEDTLS_ZLIB_SUPPORT */ |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_write != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) ); |
| |
| ret = mbedtls_ssl_hw_record_write( ssl ); |
| if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| |
| if( ret == 0 ) |
| done = 1; |
| } |
| #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ |
| if( !done ) |
| { |
| unsigned i; |
| size_t protected_record_size; |
| |
| ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype; |
| mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, |
| ssl->conf->transport, ssl->out_hdr + 1 ); |
| |
| memcpy( ssl->out_ctr, ssl->cur_out_ctr, 8 ); |
| ssl->out_len[0] = (unsigned char)( len >> 8 ); |
| ssl->out_len[1] = (unsigned char)( len ); |
| |
| if( ssl->transform_out != NULL ) |
| { |
| if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret ); |
| return( ret ); |
| } |
| |
| len = ssl->out_msglen; |
| ssl->out_len[0] = (unsigned char)( len >> 8 ); |
| ssl->out_len[1] = (unsigned char)( len ); |
| } |
| |
| protected_record_size = len + mbedtls_ssl_hdr_len( ssl ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| /* In case of DTLS, double-check that we don't exceed |
| * the remaining space in the datagram. */ |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ret = ssl_get_remaining_space_in_datagram( ssl ); |
| if( ret < 0 ) |
| return( ret ); |
| |
| if( protected_record_size > (size_t) ret ) |
| { |
| /* Should never happen */ |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, " |
| "version = [%d:%d], msglen = %d", |
| ssl->out_hdr[0], ssl->out_hdr[1], |
| ssl->out_hdr[2], len ) ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network", |
| ssl->out_hdr, protected_record_size ); |
| |
| ssl->out_left += protected_record_size; |
| ssl->out_hdr += protected_record_size; |
| ssl_update_out_pointers( ssl, ssl->transform_out ); |
| |
| for( i = 8; i > ssl_ep_len( ssl ); i-- ) |
| if( ++ssl->cur_out_ctr[i - 1] != 0 ) |
| break; |
| |
| /* The loop goes to its end iff the counter is wrapping */ |
| if( i == ssl_ep_len( ssl ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) ); |
| return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); |
| } |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| flush == SSL_DONT_FORCE_FLUSH ) |
| { |
| size_t remaining; |
| ret = ssl_get_remaining_payload_in_datagram( ssl ); |
| if( ret < 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_remaining_payload_in_datagram", |
| ret ); |
| return( ret ); |
| } |
| |
| remaining = (size_t) ret; |
| if( remaining == 0 ) |
| { |
| flush = SSL_FORCE_FLUSH; |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Still %u bytes available in current datagram", (unsigned) remaining ) ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| if( ( flush == SSL_FORCE_FLUSH ) && |
| ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| |
| static int ssl_hs_is_proper_fragment( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->in_msglen < ssl->in_hslen || |
| memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 || |
| memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ) |
| { |
| return( 1 ); |
| } |
| return( 0 ); |
| } |
| |
| static uint32_t ssl_get_hs_frag_len( mbedtls_ssl_context const *ssl ) |
| { |
| return( ( ssl->in_msg[9] << 16 ) | |
| ( ssl->in_msg[10] << 8 ) | |
| ssl->in_msg[11] ); |
| } |
| |
| static uint32_t ssl_get_hs_frag_off( mbedtls_ssl_context const *ssl ) |
| { |
| return( ( ssl->in_msg[6] << 16 ) | |
| ( ssl->in_msg[7] << 8 ) | |
| ssl->in_msg[8] ); |
| } |
| |
| static int ssl_check_hs_header( mbedtls_ssl_context const *ssl ) |
| { |
| uint32_t msg_len, frag_off, frag_len; |
| |
| msg_len = ssl_get_hs_total_len( ssl ); |
| frag_off = ssl_get_hs_frag_off( ssl ); |
| frag_len = ssl_get_hs_frag_len( ssl ); |
| |
| if( frag_off > msg_len ) |
| return( -1 ); |
| |
| if( frag_len > msg_len - frag_off ) |
| return( -1 ); |
| |
| if( frag_len + 12 > ssl->in_msglen ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Mark bits in bitmask (used for DTLS HS reassembly) |
| */ |
| static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len ) |
| { |
| unsigned int start_bits, end_bits; |
| |
| start_bits = 8 - ( offset % 8 ); |
| if( start_bits != 8 ) |
| { |
| size_t first_byte_idx = offset / 8; |
| |
| /* Special case */ |
| if( len <= start_bits ) |
| { |
| for( ; len != 0; len-- ) |
| mask[first_byte_idx] |= 1 << ( start_bits - len ); |
| |
| /* Avoid potential issues with offset or len becoming invalid */ |
| return; |
| } |
| |
| offset += start_bits; /* Now offset % 8 == 0 */ |
| len -= start_bits; |
| |
| for( ; start_bits != 0; start_bits-- ) |
| mask[first_byte_idx] |= 1 << ( start_bits - 1 ); |
| } |
| |
| end_bits = len % 8; |
| if( end_bits != 0 ) |
| { |
| size_t last_byte_idx = ( offset + len ) / 8; |
| |
| len -= end_bits; /* Now len % 8 == 0 */ |
| |
| for( ; end_bits != 0; end_bits-- ) |
| mask[last_byte_idx] |= 1 << ( 8 - end_bits ); |
| } |
| |
| memset( mask + offset / 8, 0xFF, len / 8 ); |
| } |
| |
| /* |
| * Check that bitmask is full |
| */ |
| static int ssl_bitmask_check( unsigned char *mask, size_t len ) |
| { |
| size_t i; |
| |
| for( i = 0; i < len / 8; i++ ) |
| if( mask[i] != 0xFF ) |
| return( -1 ); |
| |
| for( i = 0; i < len % 8; i++ ) |
| if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /* msg_len does not include the handshake header */ |
| static size_t ssl_get_reassembly_buffer_size( size_t msg_len, |
| unsigned add_bitmap ) |
| { |
| size_t alloc_len; |
| |
| alloc_len = 12; /* Handshake header */ |
| alloc_len += msg_len; /* Content buffer */ |
| |
| if( add_bitmap ) |
| alloc_len += msg_len / 8 + ( msg_len % 8 != 0 ); /* Bitmap */ |
| |
| return( alloc_len ); |
| } |
| |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl ) |
| { |
| return( ( ssl->in_msg[1] << 16 ) | |
| ( ssl->in_msg[2] << 8 ) | |
| ssl->in_msg[3] ); |
| } |
| |
| int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d", |
| ssl->in_msglen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + ssl_get_hs_total_len( ssl ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" |
| " %d, type = %d, hslen = %d", |
| ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| int ret; |
| unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; |
| |
| if( ssl_check_hs_header( ssl ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid handshake header" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| if( ssl->handshake != NULL && |
| ( ( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && |
| recv_msg_seq != ssl->handshake->in_msg_seq ) || |
| ( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER && |
| ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) ) ) |
| { |
| if( recv_msg_seq > ssl->handshake->in_msg_seq ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "received future handshake message of sequence number %u (next %u)", |
| recv_msg_seq, |
| ssl->handshake->in_msg_seq ) ); |
| return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); |
| } |
| |
| /* Retransmit only on last message from previous flight, to avoid |
| * too many retransmissions. |
| * Besides, No sane server ever retransmits HelloVerifyRequest */ |
| if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 && |
| ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, " |
| "message_seq = %d, start_of_flight = %d", |
| recv_msg_seq, |
| ssl->handshake->in_flight_start_seq ) ); |
| |
| if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); |
| return( ret ); |
| } |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: " |
| "message_seq = %d, expected = %d", |
| recv_msg_seq, |
| ssl->handshake->in_msg_seq ) ); |
| } |
| |
| return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); |
| } |
| /* Wait until message completion to increment in_msg_seq */ |
| |
| /* Message reassembly is handled alongside buffering of future |
| * messages; the commonality is that both handshake fragments and |
| * future messages cannot be forwarded immediately to the |
| * handshake logic layer. */ |
| if( ssl_hs_is_proper_fragment( ssl ) == 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) ); |
| return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| /* With TLS we don't handle fragmentation (for now) */ |
| if( ssl->in_msglen < ssl->in_hslen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) ); |
| return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| } |
| |
| return( 0 ); |
| } |
| |
| void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && hs != NULL ) |
| { |
| ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); |
| } |
| |
| /* Handshake message is complete, increment counter */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->handshake != NULL ) |
| { |
| unsigned offset; |
| mbedtls_ssl_hs_buffer *hs_buf; |
| |
| /* Increment handshake sequence number */ |
| hs->in_msg_seq++; |
| |
| /* |
| * Clear up handshake buffering and reassembly structure. |
| */ |
| |
| /* Free first entry */ |
| ssl_buffering_free_slot( ssl, 0 ); |
| |
| /* Shift all other entries */ |
| for( offset = 0, hs_buf = &hs->buffering.hs[0]; |
| offset + 1 < MBEDTLS_SSL_MAX_BUFFERED_HS; |
| offset++, hs_buf++ ) |
| { |
| *hs_buf = *(hs_buf + 1); |
| } |
| |
| /* Create a fresh last entry */ |
| memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) ); |
| } |
| #endif |
| } |
| |
| /* |
| * DTLS anti-replay: RFC 6347 4.1.2.6 |
| * |
| * in_window is a field of bits numbered from 0 (lsb) to 63 (msb). |
| * Bit n is set iff record number in_window_top - n has been seen. |
| * |
| * Usually, in_window_top is the last record number seen and the lsb of |
| * in_window is set. The only exception is the initial state (record number 0 |
| * not seen yet). |
| */ |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl ) |
| { |
| ssl->in_window_top = 0; |
| ssl->in_window = 0; |
| } |
| |
| static inline uint64_t ssl_load_six_bytes( unsigned char *buf ) |
| { |
| return( ( (uint64_t) buf[0] << 40 ) | |
| ( (uint64_t) buf[1] << 32 ) | |
| ( (uint64_t) buf[2] << 24 ) | |
| ( (uint64_t) buf[3] << 16 ) | |
| ( (uint64_t) buf[4] << 8 ) | |
| ( (uint64_t) buf[5] ) ); |
| } |
| |
| /* |
| * Return 0 if sequence number is acceptable, -1 otherwise |
| */ |
| int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl ) |
| { |
| uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); |
| uint64_t bit; |
| |
| if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) |
| return( 0 ); |
| |
| if( rec_seqnum > ssl->in_window_top ) |
| return( 0 ); |
| |
| bit = ssl->in_window_top - rec_seqnum; |
| |
| if( bit >= 64 ) |
| return( -1 ); |
| |
| if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Update replay window on new validated record |
| */ |
| void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl ) |
| { |
| uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); |
| |
| if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) |
| return; |
| |
| if( rec_seqnum > ssl->in_window_top ) |
| { |
| /* Update window_top and the contents of the window */ |
| uint64_t shift = rec_seqnum - ssl->in_window_top; |
| |
| if( shift >= 64 ) |
| ssl->in_window = 1; |
| else |
| { |
| ssl->in_window <<= shift; |
| ssl->in_window |= 1; |
| } |
| |
| ssl->in_window_top = rec_seqnum; |
| } |
| else |
| { |
| /* Mark that number as seen in the current window */ |
| uint64_t bit = ssl->in_window_top - rec_seqnum; |
| |
| if( bit < 64 ) /* Always true, but be extra sure */ |
| ssl->in_window |= (uint64_t) 1 << bit; |
| } |
| } |
| #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ |
| |
| #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) |
| /* Forward declaration */ |
| static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ); |
| |
| /* |
| * Without any SSL context, check if a datagram looks like a ClientHello with |
| * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message. |
| * Both input and output include full DTLS headers. |
| * |
| * - if cookie is valid, return 0 |
| * - if ClientHello looks superficially valid but cookie is not, |
| * fill obuf and set olen, then |
| * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED |
| * - otherwise return a specific error code |
| */ |
| static int ssl_check_dtls_clihlo_cookie( |
| mbedtls_ssl_cookie_write_t *f_cookie_write, |
| mbedtls_ssl_cookie_check_t *f_cookie_check, |
| void *p_cookie, |
| const unsigned char *cli_id, size_t cli_id_len, |
| const unsigned char *in, size_t in_len, |
| unsigned char *obuf, size_t buf_len, size_t *olen ) |
| { |
| size_t sid_len, cookie_len; |
| unsigned char *p; |
| |
| if( f_cookie_write == NULL || f_cookie_check == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| /* |
| * Structure of ClientHello with record and handshake headers, |
| * and expected values. We don't need to check a lot, more checks will be |
| * done when actually parsing the ClientHello - skipping those checks |
| * avoids code duplication and does not make cookie forging any easier. |
| * |
| * 0-0 ContentType type; copied, must be handshake |
| * 1-2 ProtocolVersion version; copied |
| * 3-4 uint16 epoch; copied, must be 0 |
| * 5-10 uint48 sequence_number; copied |
| * 11-12 uint16 length; (ignored) |
| * |
| * 13-13 HandshakeType msg_type; (ignored) |
| * 14-16 uint24 length; (ignored) |
| * 17-18 uint16 message_seq; copied |
| * 19-21 uint24 fragment_offset; copied, must be 0 |
| * 22-24 uint24 fragment_length; (ignored) |
| * |
| * 25-26 ProtocolVersion client_version; (ignored) |
| * 27-58 Random random; (ignored) |
| * 59-xx SessionID session_id; 1 byte len + sid_len content |
| * 60+ opaque cookie<0..2^8-1>; 1 byte len + content |
| * ... |
| * |
| * Minimum length is 61 bytes. |
| */ |
| if( in_len < 61 || |
| in[0] != MBEDTLS_SSL_MSG_HANDSHAKE || |
| in[3] != 0 || in[4] != 0 || |
| in[19] != 0 || in[20] != 0 || in[21] != 0 ) |
| { |
| return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| } |
| |
| sid_len = in[59]; |
| if( sid_len > in_len - 61 ) |
| return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| |
| cookie_len = in[60 + sid_len]; |
| if( cookie_len > in_len - 60 ) |
| return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| |
| if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len, |
| cli_id, cli_id_len ) == 0 ) |
| { |
| /* Valid cookie */ |
| return( 0 ); |
| } |
| |
| /* |
| * If we get here, we've got an invalid cookie, let's prepare HVR. |
| * |
| * 0-0 ContentType type; copied |
| * 1-2 ProtocolVersion version; copied |
| * 3-4 uint16 epoch; copied |
| * 5-10 uint48 sequence_number; copied |
| * 11-12 uint16 length; olen - 13 |
| * |
| * 13-13 HandshakeType msg_type; hello_verify_request |
| * 14-16 uint24 length; olen - 25 |
| * 17-18 uint16 message_seq; copied |
| * 19-21 uint24 fragment_offset; copied |
| * 22-24 uint24 fragment_length; olen - 25 |
| * |
| * 25-26 ProtocolVersion server_version; 0xfe 0xff |
| * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie |
| * |
| * Minimum length is 28. |
| */ |
| if( buf_len < 28 ) |
| return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); |
| |
| /* Copy most fields and adapt others */ |
| memcpy( obuf, in, 25 ); |
| obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST; |
| obuf[25] = 0xfe; |
| obuf[26] = 0xff; |
| |
| /* Generate and write actual cookie */ |
| p = obuf + 28; |
| if( f_cookie_write( p_cookie, |
| &p, obuf + buf_len, cli_id, cli_id_len ) != 0 ) |
| { |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| *olen = p - obuf; |
| |
| /* Go back and fill length fields */ |
| obuf[27] = (unsigned char)( *olen - 28 ); |
| |
| obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 ); |
| obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 ); |
| obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) ); |
| |
| obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 ); |
| obuf[12] = (unsigned char)( ( *olen - 13 ) ); |
| |
| return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); |
| } |
| |
| /* |
| * Handle possible client reconnect with the same UDP quadruplet |
| * (RFC 6347 Section 4.2.8). |
| * |
| * Called by ssl_parse_record_header() in case we receive an epoch 0 record |
| * that looks like a ClientHello. |
| * |
| * - if the input looks like a ClientHello without cookies, |
| * send back HelloVerifyRequest, then |
| * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED |
| * - if the input looks like a ClientHello with a valid cookie, |
| * reset the session of the current context, and |
| * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT |
| * - if anything goes wrong, return a specific error code |
| * |
| * mbedtls_ssl_read_record() will ignore the record if anything else than |
| * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function |
| * cannot not return 0. |
| */ |
| static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| size_t len; |
| |
| ret = ssl_check_dtls_clihlo_cookie( |
| ssl->conf->f_cookie_write, |
| ssl->conf->f_cookie_check, |
| ssl->conf->p_cookie, |
| ssl->cli_id, ssl->cli_id_len, |
| ssl->in_buf, ssl->in_left, |
| ssl->out_buf, MBEDTLS_SSL_OUT_CONTENT_LEN, &len ); |
| |
| MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret ); |
| |
| if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ) |
| { |
| /* Don't check write errors as we can't do anything here. |
| * If the error is permanent we'll catch it later, |
| * if it's not, then hopefully it'll work next time. */ |
| (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len ); |
| |
| return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); |
| } |
| |
| if( ret == 0 ) |
| { |
| /* Got a valid cookie, partially reset context */ |
| if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret ); |
| return( ret ); |
| } |
| |
| return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT ); |
| } |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ |
| |
| /* |
| * ContentType type; |
| * ProtocolVersion version; |
| * uint16 epoch; // DTLS only |
| * uint48 sequence_number; // DTLS only |
| * uint16 length; |
| * |
| * Return 0 if header looks sane (and, for DTLS, the record is expected) |
| * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad, |
| * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected. |
| * |
| * With DTLS, mbedtls_ssl_read_record() will: |
| * 1. proceed with the record if this function returns 0 |
| * 2. drop only the current record if this function returns UNEXPECTED_RECORD |
| * 3. return CLIENT_RECONNECT if this function return that value |
| * 4. drop the whole datagram if this function returns anything else. |
| * Point 2 is needed when the peer is resending, and we have already received |
| * the first record from a datagram but are still waiting for the others. |
| */ |
| static int ssl_parse_record_header( mbedtls_ssl_context *ssl ) |
| { |
| int major_ver, minor_ver; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) ); |
| |
| ssl->in_msgtype = ssl->in_hdr[0]; |
| ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1]; |
| mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, " |
| "version = [%d:%d], msglen = %d", |
| ssl->in_msgtype, |
| major_ver, minor_ver, ssl->in_msglen ) ); |
| |
| /* Check record type */ |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT && |
| ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC && |
| ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| /* Silently ignore invalid DTLS records as recommended by RFC 6347 |
| * Section 4.1.2.7 */ |
| if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); |
| |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| /* Check version */ |
| if( major_ver != ssl->major_ver ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| if( minor_ver > ssl->conf->max_minor_ver ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| /* Check length against the size of our buffer */ |
| if( ssl->in_msglen > MBEDTLS_SSL_IN_BUFFER_LEN |
| - (size_t)( ssl->in_msg - ssl->in_buf ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| /* |
| * DTLS-related tests. |
| * Check epoch before checking length constraint because |
| * the latter varies with the epoch. E.g., if a ChangeCipherSpec |
| * message gets duplicated before the corresponding Finished message, |
| * the second ChangeCipherSpec should be discarded because it belongs |
| * to an old epoch, but not because its length is shorter than |
| * the minimum record length for packets using the new record transform. |
| * Note that these two kinds of failures are handled differently, |
| * as an unexpected record is silently skipped but an invalid |
| * record leads to the entire datagram being dropped. |
| */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1]; |
| |
| /* Check epoch (and sequence number) with DTLS */ |
| if( rec_epoch != ssl->in_epoch ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: " |
| "expected %d, received %d", |
| ssl->in_epoch, rec_epoch ) ); |
| |
| #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) |
| /* |
| * Check for an epoch 0 ClientHello. We can't use in_msg here to |
| * access the first byte of record content (handshake type), as we |
| * have an active transform (possibly iv_len != 0), so use the |
| * fact that the record header len is 13 instead. |
| */ |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER && |
| rec_epoch == 0 && |
| ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->in_left > 13 && |
| ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect " |
| "from the same port" ) ); |
| return( ssl_handle_possible_reconnect( ssl ) ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ |
| { |
| /* Consider buffering the record. */ |
| if( rec_epoch == (unsigned int) ssl->in_epoch + 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Consider record for buffering" ) ); |
| return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); |
| } |
| |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); |
| } |
| } |
| |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| /* Replay detection only works for the current epoch */ |
| if( rec_epoch == ssl->in_epoch && |
| mbedtls_ssl_dtls_replay_check( ssl ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); |
| } |
| #endif |
| |
| /* Drop unexpected ApplicationData records, |
| * except at the beginning of renegotiations */ |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA && |
| ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && |
| ssl->state == MBEDTLS_SSL_SERVER_HELLO ) |
| #endif |
| ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| |
| /* Check length against bounds of the current transform and version */ |
| if( ssl->transform_in == NULL ) |
| { |
| if( ssl->in_msglen < 1 || |
| ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| } |
| else |
| { |
| if( ssl->in_msglen < ssl->transform_in->minlen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && |
| ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_IN_CONTENT_LEN ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| /* |
| * TLS encrypted messages can have up to 256 bytes of padding |
| */ |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 && |
| ssl->in_msglen > ssl->transform_in->minlen + |
| MBEDTLS_SSL_IN_CONTENT_LEN + 256 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| #endif |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * If applicable, decrypt (and decompress) record content |
| */ |
| static int ssl_prepare_record_content( mbedtls_ssl_context *ssl ) |
| { |
| int ret, done = 0; |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network", |
| ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ); |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_read != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) ); |
| |
| ret = mbedtls_ssl_hw_record_read( ssl ); |
| if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| |
| if( ret == 0 ) |
| done = 1; |
| } |
| #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ |
| if( !done && ssl->transform_in != NULL ) |
| { |
| if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt", |
| ssl->in_msg, ssl->in_msglen ); |
| |
| if( ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| } |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| if( ssl->transform_in != NULL && |
| ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) |
| { |
| if( ( ret = ssl_decompress_buf( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret ); |
| return( ret ); |
| } |
| } |
| #endif /* MBEDTLS_ZLIB_SUPPORT */ |
| |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| mbedtls_ssl_dtls_replay_update( ssl ); |
| } |
| #endif |
| |
| return( 0 ); |
| } |
| |
| static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ); |
| |
| /* |
| * Read a record. |
| * |
| * Silently ignore non-fatal alert (and for DTLS, invalid records as well, |
| * RFC 6347 4.1.2.7) and continue reading until a valid record is found. |
| * |
| */ |
| |
| /* Helper functions for mbedtls_ssl_read_record(). */ |
| static int ssl_consume_current_message( mbedtls_ssl_context *ssl ); |
| static int ssl_get_next_record( mbedtls_ssl_context *ssl ); |
| static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl ); |
| |
| int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl, |
| unsigned update_hs_digest ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) ); |
| |
| if( ssl->keep_current_message == 0 ) |
| { |
| do { |
| |
| ret = ssl_consume_current_message( ssl ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| if( ssl_record_is_in_progress( ssl ) == 0 ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| int have_buffered = 0; |
| |
| /* We only check for buffered messages if the |
| * current datagram is fully consumed. */ |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl_next_record_is_in_datagram( ssl ) == 0 ) |
| { |
| if( ssl_load_buffered_message( ssl ) == 0 ) |
| have_buffered = 1; |
| } |
| |
| if( have_buffered == 0 ) |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| { |
| ret = ssl_get_next_record( ssl ); |
| if( ret == MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ) |
| continue; |
| |
| if( ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_get_next_record" ), ret ); |
| return( ret ); |
| } |
| } |
| } |
| |
| ret = mbedtls_ssl_handle_message_type( ssl ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE ) |
| { |
| /* Buffer future message */ |
| ret = ssl_buffer_message( ssl ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| ret = MBEDTLS_ERR_SSL_CONTINUE_PROCESSING; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| } while( MBEDTLS_ERR_SSL_NON_FATAL == ret || |
| MBEDTLS_ERR_SSL_CONTINUE_PROCESSING == ret ); |
| |
| if( 0 != ret ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret ); |
| return( ret ); |
| } |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| update_hs_digest == 1 ) |
| { |
| mbedtls_ssl_update_handshake_status( ssl ); |
| } |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "reuse previously read message" ) ); |
| ssl->keep_current_message = 0; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->in_left > ssl->next_record_offset ) |
| return( 1 ); |
| |
| return( 0 ); |
| } |
| |
| static int ssl_load_buffered_message( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| mbedtls_ssl_hs_buffer * hs_buf; |
| int ret = 0; |
| |
| if( hs == NULL ) |
| return( -1 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_messsage" ) ); |
| |
| if( ssl->state == MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC || |
| ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ) |
| { |
| /* Check if we have seen a ChangeCipherSpec before. |
| * If yes, synthesize a CCS record. */ |
| if( !hs->buffering.seen_ccs ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "CCS not seen in the current flight" ) ); |
| ret = -1; |
| goto exit; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Injecting buffered CCS message" ) ); |
| ssl->in_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC; |
| ssl->in_msglen = 1; |
| ssl->in_msg[0] = 1; |
| |
| /* As long as they are equal, the exact value doesn't matter. */ |
| ssl->in_left = 0; |
| ssl->next_record_offset = 0; |
| |
| hs->buffering.seen_ccs = 0; |
| goto exit; |
| } |
| |
| #if defined(MBEDTLS_DEBUG_C) |
| /* Debug only */ |
| { |
| unsigned offset; |
| for( offset = 1; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ ) |
| { |
| hs_buf = &hs->buffering.hs[offset]; |
| if( hs_buf->is_valid == 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Future message with sequence number %u %s buffered.", |
| hs->in_msg_seq + offset, |
| hs_buf->is_complete ? "fully" : "partially" ) ); |
| } |
| } |
| } |
| #endif /* MBEDTLS_DEBUG_C */ |
| |
| /* Check if we have buffered and/or fully reassembled the |
| * next handshake message. */ |
| hs_buf = &hs->buffering.hs[0]; |
| if( ( hs_buf->is_valid == 1 ) && ( hs_buf->is_complete == 1 ) ) |
| { |
| /* Synthesize a record containing the buffered HS message. */ |
| size_t msg_len = ( hs_buf->data[1] << 16 ) | |
| ( hs_buf->data[2] << 8 ) | |
| hs_buf->data[3]; |
| |
| /* Double-check that we haven't accidentally buffered |
| * a message that doesn't fit into the input buffer. */ |
| if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message has been buffered - load" ) ); |
| MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered handshake message (incl. header)", |
| hs_buf->data, msg_len + 12 ); |
| |
| ssl->in_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; |
| ssl->in_hslen = msg_len + 12; |
| ssl->in_msglen = msg_len + 12; |
| memcpy( ssl->in_msg, hs_buf->data, ssl->in_hslen ); |
| |
| ret = 0; |
| goto exit; |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message %u not or only partially bufffered", |
| hs->in_msg_seq ) ); |
| } |
| |
| ret = -1; |
| |
| exit: |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_message" ) ); |
| return( ret ); |
| } |
| |
| static int ssl_buffer_make_space( mbedtls_ssl_context *ssl, |
| size_t desired ) |
| { |
| int offset; |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Attempt to free buffered messages to have %u bytes available", |
| (unsigned) desired ) ); |
| |
| /* Get rid of future records epoch first, if such exist. */ |
| ssl_free_buffered_record( ssl ); |
| |
| /* Check if we have enough space available now. */ |
| if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - |
| hs->buffering.total_bytes_buffered ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing future epoch record" ) ); |
| return( 0 ); |
| } |
| |
| /* We don't have enough space to buffer the next expected handshake |
| * message. Remove buffers used for future messages to gain space, |
| * starting with the most distant one. */ |
| for( offset = MBEDTLS_SSL_MAX_BUFFERED_HS - 1; |
| offset >= 0; offset-- ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Free buffering slot %d to make space for reassembly of next handshake message", |
| offset ) ); |
| |
| ssl_buffering_free_slot( ssl, (uint8_t) offset ); |
| |
| /* Check if we have enough space available now. */ |
| if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - |
| hs->buffering.total_bytes_buffered ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing buffered HS messages" ) ); |
| return( 0 ); |
| } |
| } |
| |
| return( -1 ); |
| } |
| |
| static int ssl_buffer_message( mbedtls_ssl_context *ssl ) |
| { |
| int ret = 0; |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| |
| if( hs == NULL ) |
| return( 0 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_buffer_message" ) ); |
| |
| switch( ssl->in_msgtype ) |
| { |
| case MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC: |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Remember CCS message" ) ); |
| |
| hs->buffering.seen_ccs = 1; |
| break; |
| |
| case MBEDTLS_SSL_MSG_HANDSHAKE: |
| { |
| unsigned recv_msg_seq_offset; |
| unsigned recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; |
| mbedtls_ssl_hs_buffer *hs_buf; |
| size_t msg_len = ssl->in_hslen - 12; |
| |
| /* We should never receive an old handshake |
| * message - double-check nonetheless. */ |
| if( recv_msg_seq < ssl->handshake->in_msg_seq ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| recv_msg_seq_offset = recv_msg_seq - ssl->handshake->in_msg_seq; |
| if( recv_msg_seq_offset >= MBEDTLS_SSL_MAX_BUFFERED_HS ) |
| { |
| /* Silently ignore -- message too far in the future */ |
| MBEDTLS_SSL_DEBUG_MSG( 2, |
| ( "Ignore future HS message with sequence number %u, " |
| "buffering window %u - %u", |
| recv_msg_seq, ssl->handshake->in_msg_seq, |
| ssl->handshake->in_msg_seq + MBEDTLS_SSL_MAX_BUFFERED_HS - 1 ) ); |
| |
| goto exit; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering HS message with sequence number %u, offset %u ", |
| recv_msg_seq, recv_msg_seq_offset ) ); |
| |
| hs_buf = &hs->buffering.hs[ recv_msg_seq_offset ]; |
| |
| /* Check if the buffering for this seq nr has already commenced. */ |
| if( !hs_buf->is_valid ) |
| { |
| size_t reassembly_buf_sz; |
| |
| hs_buf->is_fragmented = |
| ( ssl_hs_is_proper_fragment( ssl ) == 1 ); |
| |
| /* We copy the message back into the input buffer |
| * after reassembly, so check that it's not too large. |
| * This is an implementation-specific limitation |
| * and not one from the standard, hence it is not |
| * checked in ssl_check_hs_header(). */ |
| if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN ) |
| { |
| /* Ignore message */ |
| goto exit; |
| } |
| |
| /* Check if we have enough space to buffer the message. */ |
| if( hs->buffering.total_bytes_buffered > |
| MBEDTLS_SSL_DTLS_MAX_BUFFERING ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| reassembly_buf_sz = ssl_get_reassembly_buffer_size( msg_len, |
| hs_buf->is_fragmented ); |
| |
| if( reassembly_buf_sz > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - |
| hs->buffering.total_bytes_buffered ) ) |
| { |
| if( recv_msg_seq_offset > 0 ) |
| { |
| /* If we can't buffer a future message because |
| * of space limitations -- ignore. */ |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n", |
| (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING, |
| (unsigned) hs->buffering.total_bytes_buffered ) ); |
| goto exit; |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- attempt to make space by freeing buffered future messages\n", |
| (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING, |
| (unsigned) hs->buffering.total_bytes_buffered ) ); |
| } |
| |
| if( ssl_buffer_make_space( ssl, reassembly_buf_sz ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reassembly of next message of size %u (%u with bitmap) would exceed the compile-time limit %u (already %u bytes buffered) -- fail\n", |
| (unsigned) msg_len, |
| (unsigned) reassembly_buf_sz, |
| MBEDTLS_SSL_DTLS_MAX_BUFFERING, |
| (unsigned) hs->buffering.total_bytes_buffered ) ); |
| ret = MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; |
| goto exit; |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d", |
| msg_len ) ); |
| |
| hs_buf->data = mbedtls_calloc( 1, reassembly_buf_sz ); |
| if( hs_buf->data == NULL ) |
| { |
| ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; |
| goto exit; |
| } |
| hs_buf->data_len = reassembly_buf_sz; |
| |
| /* Prepare final header: copy msg_type, length and message_seq, |
| * then add standardised fragment_offset and fragment_length */ |
| memcpy( hs_buf->data, ssl->in_msg, 6 ); |
| memset( hs_buf->data + 6, 0, 3 ); |
| memcpy( hs_buf->data + 9, hs_buf->data + 1, 3 ); |
| |
| hs_buf->is_valid = 1; |
| |
| hs->buffering.total_bytes_buffered += reassembly_buf_sz; |
| } |
| else |
| { |
| /* Make sure msg_type and length are consistent */ |
| if( memcmp( hs_buf->data, ssl->in_msg, 4 ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "Fragment header mismatch - ignore" ) ); |
| /* Ignore */ |
| goto exit; |
| } |
| } |
| |
| if( !hs_buf->is_complete ) |
| { |
| size_t frag_len, frag_off; |
| unsigned char * const msg = hs_buf->data + 12; |
| |
| /* |
| * Check and copy current fragment |
| */ |
| |
| /* Validation of header fields already done in |
| * mbedtls_ssl_prepare_handshake_record(). */ |
| frag_off = ssl_get_hs_frag_off( ssl ); |
| frag_len = ssl_get_hs_frag_len( ssl ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d", |
| frag_off, frag_len ) ); |
| memcpy( msg + frag_off, ssl->in_msg + 12, frag_len ); |
| |
| if( hs_buf->is_fragmented ) |
| { |
| unsigned char * const bitmask = msg + msg_len; |
| ssl_bitmask_set( bitmask, frag_off, frag_len ); |
| hs_buf->is_complete = ( ssl_bitmask_check( bitmask, |
| msg_len ) == 0 ); |
| } |
| else |
| { |
| hs_buf->is_complete = 1; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "message %scomplete", |
| hs_buf->is_complete ? "" : "not yet " ) ); |
| } |
| |
| break; |
| } |
| |
| default: |
| /* We don't buffer other types of messages. */ |
| break; |
| } |
| |
| exit: |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_buffer_message" ) ); |
| return( ret ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| static int ssl_consume_current_message( mbedtls_ssl_context *ssl ) |
| { |
| /* |
| * Consume last content-layer message and potentially |
| * update in_msglen which keeps track of the contents' |
| * consumption state. |
| * |
| * (1) Handshake messages: |
| * Remove last handshake message, move content |
| * and adapt in_msglen. |
| * |
| * (2) Alert messages: |
| * Consume whole record content, in_msglen = 0. |
| * |
| * (3) Change cipher spec: |
| * Consume whole record content, in_msglen = 0. |
| * |
| * (4) Application data: |
| * Don't do anything - the record layer provides |
| * the application data as a stream transport |
| * and consumes through mbedtls_ssl_read only. |
| * |
| */ |
| |
| /* Case (1): Handshake messages */ |
| if( ssl->in_hslen != 0 ) |
| { |
| /* Hard assertion to be sure that no application data |
| * is in flight, as corrupting ssl->in_msglen during |
| * ssl->in_offt != NULL is fatal. */ |
| if( ssl->in_offt != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| /* |
| * Get next Handshake message in the current record |
| */ |
| |
| /* Notes: |
| * (1) in_hslen is not necessarily the size of the |
| * current handshake content: If DTLS handshake |
| * fragmentation is used, that's the fragment |
| * size instead. Using the total handshake message |
| * size here is faulty and should be changed at |
| * some point. |
| * (2) While it doesn't seem to cause problems, one |
| * has to be very careful not to assume that in_hslen |
| * is always <= in_msglen in a sensible communication. |
| * Again, it's wrong for DTLS handshake fragmentation. |
| * The following check is therefore mandatory, and |
| * should not be treated as a silently corrected assertion. |
| * Additionally, ssl->in_hslen might be arbitrarily out of |
| * bounds after handling a DTLS message with an unexpected |
| * sequence number, see mbedtls_ssl_prepare_handshake_record. |
| */ |
| if( ssl->in_hslen < ssl->in_msglen ) |
| { |
| ssl->in_msglen -= ssl->in_hslen; |
| memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen, |
| ssl->in_msglen ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record", |
| ssl->in_msg, ssl->in_msglen ); |
| } |
| else |
| { |
| ssl->in_msglen = 0; |
| } |
| |
| ssl->in_hslen = 0; |
| } |
| /* Case (4): Application data */ |
| else if( ssl->in_offt != NULL ) |
| { |
| return( 0 ); |
| } |
| /* Everything else (CCS & Alerts) */ |
| else |
| { |
| ssl->in_msglen = 0; |
| } |
| |
| return( 0 ); |
| } |
| |
| static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->in_msglen > 0 ) |
| return( 1 ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| |
| static void ssl_free_buffered_record( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| if( hs == NULL ) |
| return; |
| |
| if( hs->buffering.future_record.data != NULL ) |
| { |
| hs->buffering.total_bytes_buffered -= |
| hs->buffering.future_record.len; |
| |
| mbedtls_free( hs->buffering.future_record.data ); |
| hs->buffering.future_record.data = NULL; |
| } |
| } |
| |
| static int ssl_load_buffered_record( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| unsigned char * rec; |
| size_t rec_len; |
| unsigned rec_epoch; |
| |
| if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| return( 0 ); |
| |
| if( hs == NULL ) |
| return( 0 ); |
| |
| rec = hs->buffering.future_record.data; |
| rec_len = hs->buffering.future_record.len; |
| rec_epoch = hs->buffering.future_record.epoch; |
| |
| if( rec == NULL ) |
| return( 0 ); |
| |
| /* Only consider loading future records if the |
| * input buffer is empty. */ |
| if( ssl_next_record_is_in_datagram( ssl ) == 1 ) |
| return( 0 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_record" ) ); |
| |
| if( rec_epoch != ssl->in_epoch ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffered record not from current epoch." ) ); |
| goto exit; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Found buffered record from current epoch - load" ) ); |
| |
| /* Double-check that the record is not too large */ |
| if( rec_len > MBEDTLS_SSL_IN_BUFFER_LEN - |
| (size_t)( ssl->in_hdr - ssl->in_buf ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| memcpy( ssl->in_hdr, rec, rec_len ); |
| ssl->in_left = rec_len; |
| ssl->next_record_offset = 0; |
| |
| ssl_free_buffered_record( ssl ); |
| |
| exit: |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_record" ) ); |
| return( 0 ); |
| } |
| |
| static int ssl_buffer_future_record( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| size_t const rec_hdr_len = 13; |
| size_t const total_buf_sz = rec_hdr_len + ssl->in_msglen; |
| |
| /* Don't buffer future records outside handshakes. */ |
| if( hs == NULL ) |
| return( 0 ); |
| |
| /* Only buffer handshake records (we are only interested |
| * in Finished messages). */ |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) |
| return( 0 ); |
| |
| /* Don't buffer more than one future epoch record. */ |
| if( hs->buffering.future_record.data != NULL ) |
| return( 0 ); |
| |
| /* Don't buffer record if there's not enough buffering space remaining. */ |
| if( total_buf_sz > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING - |
| hs->buffering.total_bytes_buffered ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future epoch record of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n", |
| (unsigned) total_buf_sz, MBEDTLS_SSL_DTLS_MAX_BUFFERING, |
| (unsigned) hs->buffering.total_bytes_buffered ) ); |
| return( 0 ); |
| } |
| |
| /* Buffer record */ |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffer record from epoch %u", |
| ssl->in_epoch + 1 ) ); |
| MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered record", ssl->in_hdr, |
| rec_hdr_len + ssl->in_msglen ); |
| |
| /* ssl_parse_record_header() only considers records |
| * of the next epoch as candidates for buffering. */ |
| hs->buffering.future_record.epoch = ssl->in_epoch + 1; |
| hs->buffering.future_record.len = total_buf_sz; |
| |
| hs->buffering.future_record.data = |
| mbedtls_calloc( 1, hs->buffering.future_record.len ); |
| if( hs->buffering.future_record.data == NULL ) |
| { |
| /* If we run out of RAM trying to buffer a |
| * record from the next epoch, just ignore. */ |
| return( 0 ); |
| } |
| |
| memcpy( hs->buffering.future_record.data, ssl->in_hdr, total_buf_sz ); |
| |
| hs->buffering.total_bytes_buffered += total_buf_sz; |
| return( 0 ); |
| } |
| |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| static int ssl_get_next_record( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| /* We might have buffered a future record; if so, |
| * and if the epoch matches now, load it. |
| * On success, this call will set ssl->in_left to |
| * the length of the buffered record, so that |
| * the calls to ssl_fetch_input() below will |
| * essentially be no-ops. */ |
| ret = ssl_load_buffered_record( ssl ); |
| if( ret != 0 ) |
| return( ret ); |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = ssl_parse_record_header( ssl ) ) != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT ) |
| { |
| if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE ) |
| { |
| ret = ssl_buffer_future_record( ssl ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| /* Fall through to handling of unexpected records */ |
| ret = MBEDTLS_ERR_SSL_UNEXPECTED_RECORD; |
| } |
| |
| if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ) |
| { |
| /* Skip unexpected record (but not whole datagram) */ |
| ssl->next_record_offset = ssl->in_msglen |
| + mbedtls_ssl_hdr_len( ssl ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record " |
| "(header)" ) ); |
| } |
| else |
| { |
| /* Skip invalid record and the rest of the datagram */ |
| ssl->next_record_offset = 0; |
| ssl->in_left = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record " |
| "(header)" ) ); |
| } |
| |
| /* Get next record */ |
| return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); |
| } |
| #endif |
| return( ret ); |
| } |
| |
| /* |
| * Read and optionally decrypt the message contents |
| */ |
| if( ( ret = mbedtls_ssl_fetch_input( ssl, |
| mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); |
| return( ret ); |
| } |
| |
| /* Done reading this record, get ready for the next one */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl ); |
| if( ssl->next_record_offset < ssl->in_left ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "more than one record within datagram" ) ); |
| } |
| } |
| else |
| #endif |
| ssl->in_left = 0; |
| |
| if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| /* Silently discard invalid records */ |
| if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD || |
| ret == MBEDTLS_ERR_SSL_INVALID_MAC ) |
| { |
| /* Except when waiting for Finished as a bad mac here |
| * probably means something went wrong in the handshake |
| * (eg wrong psk used, mitm downgrade attempt, etc.) */ |
| if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED || |
| ssl->state == MBEDTLS_SSL_SERVER_FINISHED ) |
| { |
| #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) |
| if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) |
| { |
| mbedtls_ssl_send_alert_message( ssl, |
| MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); |
| } |
| #endif |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) |
| if( ssl->conf->badmac_limit != 0 && |
| ++ssl->badmac_seen >= ssl->conf->badmac_limit ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_MAC ); |
| } |
| #endif |
| |
| /* As above, invalid records cause |
| * dismissal of the whole datagram. */ |
| |
| ssl->next_record_offset = 0; |
| ssl->in_left = 0; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) ); |
| return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING ); |
| } |
| |
| return( ret ); |
| } |
| else |
| #endif |
| { |
| /* Error out (and send alert) on invalid records */ |
| #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) |
| if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) |
| { |
| mbedtls_ssl_send_alert_message( ssl, |
| MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); |
| } |
| #endif |
| return( ret ); |
| } |
| } |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| /* |
| * Handle particular types of records |
| */ |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) |
| { |
| if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| } |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) |
| { |
| if( ssl->in_msglen != 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, len: %d", |
| ssl->in_msglen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| if( ssl->in_msg[0] != 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, content: %02x", |
| ssl->in_msg[0] ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC && |
| ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ) |
| { |
| if( ssl->handshake == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping ChangeCipherSpec outside handshake" ) ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "received out-of-order ChangeCipherSpec - remember" ) ); |
| return( MBEDTLS_ERR_SSL_EARLY_MESSAGE ); |
| } |
| #endif |
| } |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) |
| { |
| if( ssl->in_msglen != 2 ) |
| { |
| /* Note: Standard allows for more than one 2 byte alert |
| to be packed in a single message, but Mbed TLS doesn't |
| currently support this. */ |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d", |
| ssl->in_msglen ) ); |
| return( MBEDTLS_ERR_SSL_INVALID_RECORD ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]", |
| ssl->in_msg[0], ssl->in_msg[1] ) ); |
| |
| /* |
| * Ignore non-fatal alerts, except close_notify and no_renegotiation |
| */ |
| if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)", |
| ssl->in_msg[1] ) ); |
| return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE ); |
| } |
| |
| if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && |
| ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) ); |
| return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY ); |
| } |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED) |
| if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && |
| ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no renegotiation alert" ) ); |
| /* Will be handled when trying to parse ServerHello */ |
| return( 0 ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && |
| ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && |
| ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) ); |
| /* Will be handled in mbedtls_ssl_parse_certificate() */ |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */ |
| |
| /* Silently ignore: fetch new message */ |
| return MBEDTLS_ERR_SSL_NON_FATAL; |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->handshake != NULL && |
| ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| ssl_handshake_wrapup_free_hs_transform( ssl ); |
| } |
| #endif |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_ssl_send_alert_message( ssl, |
| MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl, |
| unsigned char level, |
| unsigned char message ) |
| { |
| int ret; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) ); |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message )); |
| |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; |
| ssl->out_msglen = 2; |
| ssl->out_msg[0] = level; |
| ssl->out_msg[1] = message; |
| |
| if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); |
| return( ret ); |
| } |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Handshake functions |
| */ |
| #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \ |
| !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) |
| /* No certificate support -> dummy functions */ |
| int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) |
| { |
| const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); |
| |
| if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) |
| { |
| const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); |
| |
| if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| #else |
| /* Some certificate support -> implement write and parse */ |
| |
| int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) |
| { |
| int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
| size_t i, n; |
| const mbedtls_x509_crt *crt; |
| const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); |
| |
| if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| { |
| if( ssl->client_auth == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| /* |
| * If using SSLv3 and got no cert, send an Alert message |
| * (otherwise an empty Certificate message will be sent). |
| */ |
| if( mbedtls_ssl_own_cert( ssl ) == NULL && |
| ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| ssl->out_msglen = 2; |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; |
| ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING; |
| ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); |
| goto write_msg; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| if( mbedtls_ssl_own_cert( ssl ) == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); |
| return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED ); |
| } |
| } |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) ); |
| |
| /* |
| * 0 . 0 handshake type |
| * 1 . 3 handshake length |
| * 4 . 6 length of all certs |
| * 7 . 9 length of cert. 1 |
| * 10 . n-1 peer certificate |
| * n . n+2 length of cert. 2 |
| * n+3 . ... upper level cert, etc. |
| */ |
| i = 7; |
| crt = mbedtls_ssl_own_cert( ssl ); |
| |
| while( crt != NULL ) |
| { |
| n = crt->raw.len; |
| if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", |
| i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) ); |
| return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE ); |
| } |
| |
| ssl->out_msg[i ] = (unsigned char)( n >> 16 ); |
| ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); |
| ssl->out_msg[i + 2] = (unsigned char)( n ); |
| |
| i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); |
| i += n; crt = crt->next; |
| } |
| |
| ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); |
| ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); |
| ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); |
| |
| ssl->out_msglen = i; |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; |
| ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) |
| write_msg: |
| #endif |
| |
| ssl->state++; |
| |
| if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) ); |
| |
| return( ret ); |
| } |
| |
| /* |
| * Once the certificate message is read, parse it into a cert chain and |
| * perform basic checks, but leave actual verification to the caller |
| */ |
| static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| size_t i, n; |
| uint8_t alert; |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| /* |
| * Check if the client sent an empty certificate |
| */ |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| if( ssl->in_msglen == 2 && |
| ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT && |
| ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && |
| ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); |
| |
| /* The client was asked for a certificate but didn't send |
| one. The client should know what's going on, so we |
| don't send an alert. */ |
| ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; |
| return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) && |
| ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && |
| ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && |
| memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); |
| |
| /* The client was asked for a certificate but didn't send |
| one. The client should know what's going on, so we |
| don't send an alert. */ |
| ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; |
| return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ |
| MBEDTLS_SSL_PROTO_TLS1_2 */ |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| |
| if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE || |
| ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| |
| i = mbedtls_ssl_hs_hdr_len( ssl ); |
| |
| /* |
| * Same message structure as in mbedtls_ssl_write_certificate() |
| */ |
| n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2]; |
| |
| if( ssl->in_msg[i] != 0 || |
| ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| |
| /* In case we tried to reuse a session but it failed */ |
| if( ssl->session_negotiate->peer_cert != NULL ) |
| { |
| mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert ); |
| mbedtls_free( ssl->session_negotiate->peer_cert ); |
| } |
| |
| if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1, |
| sizeof( mbedtls_x509_crt ) ) ) == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", |
| sizeof( mbedtls_x509_crt ) ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| |
| mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert ); |
| |
| i += 3; |
| |
| while( i < ssl->in_hslen ) |
| { |
| if ( i + 3 > ssl->in_hslen ) { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| if( ssl->in_msg[i] != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| |
| n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) |
| | (unsigned int) ssl->in_msg[i + 2]; |
| i += 3; |
| |
| if( n < 128 || i + n > ssl->in_hslen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| |
| ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert, |
| ssl->in_msg + i, n ); |
| switch( ret ) |
| { |
| case 0: /*ok*/ |
| case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: |
| /* Ignore certificate with an unknown algorithm: maybe a |
| prior certificate was already trusted. */ |
| break; |
| |
| case MBEDTLS_ERR_X509_ALLOC_FAILED: |
| alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; |
| goto crt_parse_der_failed; |
| |
| case MBEDTLS_ERR_X509_UNKNOWN_VERSION: |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| goto crt_parse_der_failed; |
| |
| default: |
| alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; |
| crt_parse_der_failed: |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert ); |
| MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret ); |
| return( ret ); |
| } |
| |
| i += n; |
| } |
| |
| MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert ); |
| |
| /* |
| * On client, make sure the server cert doesn't change during renego to |
| * avoid "triple handshake" attack: https://secure-resumption.com/ |
| */ |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && |
| ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) |
| { |
| if( ssl->session->peer_cert == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| |
| if( ssl->session->peer_cert->raw.len != |
| ssl->session_negotiate->peer_cert->raw.len || |
| memcmp( ssl->session->peer_cert->raw.p, |
| ssl->session_negotiate->peer_cert->raw.p, |
| ssl->session->peer_cert->raw.len ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = |
| ssl->transform_negotiate->ciphersuite_info; |
| #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET |
| ? ssl->handshake->sni_authmode |
| : ssl->conf->authmode; |
| #else |
| const int authmode = ssl->conf->authmode; |
| #endif |
| void *rs_ctx = NULL; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); |
| |
| if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); |
| ssl->state++; |
| return( 0 ); |
| } |
| |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| authmode == MBEDTLS_SSL_VERIFY_NONE ) |
| { |
| ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); |
| |
| ssl->state++; |
| return( 0 ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL__ECP_RESTARTABLE) |
| if( ssl->handshake->ecrs_enabled && |
| ssl->handshake->ecrs_state == ssl_ecrs_crt_verify ) |
| { |
| goto crt_verify; |
| } |
| #endif |
| |
| if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) |
| { |
| /* mbedtls_ssl_read_record may have sent an alert already. We |
| let it decide whether to alert. */ |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); |
| return( ret ); |
| } |
| |
| if( ( ret = ssl_parse_certificate_chain( ssl ) ) != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ret == MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE && |
| authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) |
| { |
| ret = 0; |
| } |
| #endif |
| |
| ssl->state++; |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_SSL__ECP_RESTARTABLE) |
| if( ssl->handshake->ecrs_enabled) |
| ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; |
| |
| crt_verify: |
| if( ssl->handshake->ecrs_enabled) |
| rs_ctx = &ssl->handshake->ecrs_ctx; |
| #endif |
| |
| if( authmode != MBEDTLS_SSL_VERIFY_NONE ) |
| { |
| mbedtls_x509_crt *ca_chain; |
| mbedtls_x509_crl *ca_crl; |
| |
| #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| if( ssl->handshake->sni_ca_chain != NULL ) |
| { |
| ca_chain = ssl->handshake->sni_ca_chain; |
| ca_crl = ssl->handshake->sni_ca_crl; |
| } |
| else |
| #endif |
| { |
| ca_chain = ssl->conf->ca_chain; |
| ca_crl = ssl->conf->ca_crl; |
| } |
| |
| /* |
| * Main check: verify certificate |
| */ |
| ret = mbedtls_x509_crt_verify_restartable( |
| ssl->session_negotiate->peer_cert, |
| ca_chain, ca_crl, |
| ssl->conf->cert_profile, |
| ssl->hostname, |
| &ssl->session_negotiate->verify_result, |
| ssl->conf->f_vrfy, ssl->conf->p_vrfy, rs_ctx ); |
| |
| if( ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); |
| } |
| |
| #if defined(MBEDTLS_SSL__ECP_RESTARTABLE) |
| if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) |
| return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ); |
| #endif |
| |
| /* |
| * Secondary checks: always done, but change 'ret' only if it was 0 |
| */ |
| |
| #if defined(MBEDTLS_ECP_C) |
| { |
| const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk; |
| |
| /* If certificate uses an EC key, make sure the curve is OK */ |
| if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && |
| mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 ) |
| { |
| ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); |
| if( ret == 0 ) |
| ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; |
| } |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert, |
| ciphersuite_info, |
| ! ssl->conf->endpoint, |
| &ssl->session_negotiate->verify_result ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) ); |
| if( ret == 0 ) |
| ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; |
| } |
| |
| /* mbedtls_x509_crt_verify_with_profile is supposed to report a |
| * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, |
| * with details encoded in the verification flags. All other kinds |
| * of error codes, including those from the user provided f_vrfy |
| * functions, are treated as fatal and lead to a failure of |
| * ssl_parse_certificate even if verification was optional. */ |
| if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && |
| ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || |
| ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) ) |
| { |
| ret = 0; |
| } |
| |
| if( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); |
| ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; |
| } |
| |
| if( ret != 0 ) |
| { |
| uint8_t alert; |
| |
| /* The certificate may have been rejected for several reasons. |
| Pick one and send the corresponding alert. Which alert to send |
| may be a subject of debate in some cases. */ |
| if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER ) |
| alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH ) |
| alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED ) |
| alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED ) |
| alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; |
| else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED ) |
| alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; |
| else |
| alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| alert ); |
| } |
| |
| #if defined(MBEDTLS_DEBUG_C) |
| if( ssl->session_negotiate->verify_result != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x", |
| ssl->session_negotiate->verify_result ) ); |
| } |
| else |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) ); |
| } |
| #endif /* MBEDTLS_DEBUG_C */ |
| } |
| |
| ssl->state++; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); |
| |
| return( ret ); |
| } |
| #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED |
| !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ |
| |
| int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) ); |
| |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC; |
| ssl->out_msglen = 1; |
| ssl->out_msg[0] = 1; |
| |
| ssl->state++; |
| |
| if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) ); |
| |
| if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); |
| return( ret ); |
| } |
| |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| |
| /* CCS records are only accepted if they have length 1 and content '1', |
| * so we don't need to check this here. */ |
| |
| /* |
| * Switch to our negotiated transform and session parameters for inbound |
| * data. |
| */ |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) ); |
| ssl->transform_in = ssl->transform_negotiate; |
| ssl->session_in = ssl->session_negotiate; |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| ssl_dtls_replay_reset( ssl ); |
| #endif |
| |
| /* Increment epoch */ |
| if( ++ssl->in_epoch == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); |
| /* This is highly unlikely to happen for legitimate reasons, so |
| treat it as an attack and don't send an alert. */ |
| return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| memset( ssl->in_ctr, 0, 8 ); |
| |
| ssl_update_in_pointers( ssl, ssl->transform_negotiate ); |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_activate != NULL ) |
| { |
| if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| } |
| #endif |
| |
| ssl->state++; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) ); |
| |
| return( 0 ); |
| } |
| |
| void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, |
| const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) |
| { |
| ((void) ciphersuite_info); |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) |
| ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; |
| else |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA512_C) |
| if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) |
| ssl->handshake->update_checksum = ssl_update_checksum_sha384; |
| else |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 ) |
| ssl->handshake->update_checksum = ssl_update_checksum_sha256; |
| else |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return; |
| } |
| } |
| |
| void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 ); |
| mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 ); |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 ); |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| } |
| |
| static void ssl_update_checksum_start( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); |
| mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); |
| mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SHA512_C) |
| static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); |
| } |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| static void ssl_calc_finished_ssl( |
| mbedtls_ssl_context *ssl, unsigned char *buf, int from ) |
| { |
| const char *sender; |
| mbedtls_md5_context md5; |
| mbedtls_sha1_context sha1; |
| |
| unsigned char padbuf[48]; |
| unsigned char md5sum[16]; |
| unsigned char sha1sum[20]; |
| |
| mbedtls_ssl_session *session = ssl->session_negotiate; |
| if( !session ) |
| session = ssl->session; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); |
| |
| mbedtls_md5_init( &md5 ); |
| mbedtls_sha1_init( &sha1 ); |
| |
| mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); |
| mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); |
| |
| /* |
| * SSLv3: |
| * hash = |
| * MD5( master + pad2 + |
| * MD5( handshake + sender + master + pad1 ) ) |
| * + SHA1( master + pad2 + |
| * SHA1( handshake + sender + master + pad1 ) ) |
| */ |
| |
| #if !defined(MBEDTLS_MD5_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) |
| md5.state, sizeof( md5.state ) ); |
| #endif |
| |
| #if !defined(MBEDTLS_SHA1_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) |
| sha1.state, sizeof( sha1.state ) ); |
| #endif |
| |
| sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT" |
| : "SRVR"; |
| |
| memset( padbuf, 0x36, 48 ); |
| |
| mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 ); |
| mbedtls_md5_update_ret( &md5, session->master, 48 ); |
| mbedtls_md5_update_ret( &md5, padbuf, 48 ); |
| mbedtls_md5_finish_ret( &md5, md5sum ); |
| |
| mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 ); |
| mbedtls_sha1_update_ret( &sha1, session->master, 48 ); |
| mbedtls_sha1_update_ret( &sha1, padbuf, 40 ); |
| mbedtls_sha1_finish_ret( &sha1, sha1sum ); |
| |
| memset( padbuf, 0x5C, 48 ); |
| |
| mbedtls_md5_starts_ret( &md5 ); |
| mbedtls_md5_update_ret( &md5, session->master, 48 ); |
| mbedtls_md5_update_ret( &md5, padbuf, 48 ); |
| mbedtls_md5_update_ret( &md5, md5sum, 16 ); |
| mbedtls_md5_finish_ret( &md5, buf ); |
| |
| mbedtls_sha1_starts_ret( &sha1 ); |
| mbedtls_sha1_update_ret( &sha1, session->master, 48 ); |
| mbedtls_sha1_update_ret( &sha1, padbuf , 40 ); |
| mbedtls_sha1_update_ret( &sha1, sha1sum, 20 ); |
| mbedtls_sha1_finish_ret( &sha1, buf + 16 ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); |
| |
| mbedtls_md5_free( &md5 ); |
| mbedtls_sha1_free( &sha1 ); |
| |
| mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); |
| mbedtls_platform_zeroize( md5sum, sizeof( md5sum ) ); |
| mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| static void ssl_calc_finished_tls( |
| mbedtls_ssl_context *ssl, unsigned char *buf, int from ) |
| { |
| int len = 12; |
| const char *sender; |
| mbedtls_md5_context md5; |
| mbedtls_sha1_context sha1; |
| unsigned char padbuf[36]; |
| |
| mbedtls_ssl_session *session = ssl->session_negotiate; |
| if( !session ) |
| session = ssl->session; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); |
| |
| mbedtls_md5_init( &md5 ); |
| mbedtls_sha1_init( &sha1 ); |
| |
| mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); |
| mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); |
| |
| /* |
| * TLSv1: |
| * hash = PRF( master, finished_label, |
| * MD5( handshake ) + SHA1( handshake ) )[0..11] |
| */ |
| |
| #if !defined(MBEDTLS_MD5_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) |
| md5.state, sizeof( md5.state ) ); |
| #endif |
| |
| #if !defined(MBEDTLS_SHA1_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) |
| sha1.state, sizeof( sha1.state ) ); |
| #endif |
| |
| sender = ( from == MBEDTLS_SSL_IS_CLIENT ) |
| ? "client finished" |
| : "server finished"; |
| |
| mbedtls_md5_finish_ret( &md5, padbuf ); |
| mbedtls_sha1_finish_ret( &sha1, padbuf + 16 ); |
| |
| ssl->handshake->tls_prf( session->master, 48, sender, |
| padbuf, 36, buf, len ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); |
| |
| mbedtls_md5_free( &md5 ); |
| mbedtls_sha1_free( &sha1 ); |
| |
| mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| static void ssl_calc_finished_tls_sha256( |
| mbedtls_ssl_context *ssl, unsigned char *buf, int from ) |
| { |
| int len = 12; |
| const char *sender; |
| mbedtls_sha256_context sha256; |
| unsigned char padbuf[32]; |
| |
| mbedtls_ssl_session *session = ssl->session_negotiate; |
| if( !session ) |
| session = ssl->session; |
| |
| mbedtls_sha256_init( &sha256 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); |
| |
| mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); |
| |
| /* |
| * TLSv1.2: |
| * hash = PRF( master, finished_label, |
| * Hash( handshake ) )[0.11] |
| */ |
| |
| #if !defined(MBEDTLS_SHA256_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) |
| sha256.state, sizeof( sha256.state ) ); |
| #endif |
| |
| sender = ( from == MBEDTLS_SSL_IS_CLIENT ) |
| ? "client finished" |
| : "server finished"; |
| |
| mbedtls_sha256_finish_ret( &sha256, padbuf ); |
| |
| ssl->handshake->tls_prf( session->master, 48, sender, |
| padbuf, 32, buf, len ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); |
| |
| mbedtls_sha256_free( &sha256 ); |
| |
| mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); |
| } |
| #endif /* MBEDTLS_SHA256_C */ |
| |
| #if defined(MBEDTLS_SHA512_C) |
| static void ssl_calc_finished_tls_sha384( |
| mbedtls_ssl_context *ssl, unsigned char *buf, int from ) |
| { |
| int len = 12; |
| const char *sender; |
| mbedtls_sha512_context sha512; |
| unsigned char padbuf[48]; |
| |
| mbedtls_ssl_session *session = ssl->session_negotiate; |
| if( !session ) |
| session = ssl->session; |
| |
| mbedtls_sha512_init( &sha512 ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); |
| |
| mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); |
| |
| /* |
| * TLSv1.2: |
| * hash = PRF( master, finished_label, |
| * Hash( handshake ) )[0.11] |
| */ |
| |
| #if !defined(MBEDTLS_SHA512_ALT) |
| MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) |
| sha512.state, sizeof( sha512.state ) ); |
| #endif |
| |
| sender = ( from == MBEDTLS_SSL_IS_CLIENT ) |
| ? "client finished" |
| : "server finished"; |
| |
| mbedtls_sha512_finish_ret( &sha512, padbuf ); |
| |
| ssl->handshake->tls_prf( session->master, 48, sender, |
| padbuf, 48, buf, len ); |
| |
| MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); |
| |
| mbedtls_sha512_free( &sha512 ); |
| |
| mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); |
| } |
| #endif /* MBEDTLS_SHA512_C */ |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) ); |
| |
| /* |
| * Free our handshake params |
| */ |
| mbedtls_ssl_handshake_free( ssl ); |
| mbedtls_free( ssl->handshake ); |
| ssl->handshake = NULL; |
| |
| /* |
| * Free the previous transform and swith in the current one |
| */ |
| if( ssl->transform ) |
| { |
| mbedtls_ssl_transform_free( ssl->transform ); |
| mbedtls_free( ssl->transform ); |
| } |
| ssl->transform = ssl->transform_negotiate; |
| ssl->transform_negotiate = NULL; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) ); |
| } |
| |
| void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl ) |
| { |
| int resume = ssl->handshake->resume; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) ); |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) |
| { |
| ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; |
| ssl->renego_records_seen = 0; |
| } |
| #endif |
| |
| /* |
| * Free the previous session and switch in the current one |
| */ |
| if( ssl->session ) |
| { |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| /* RFC 7366 3.1: keep the EtM state */ |
| ssl->session_negotiate->encrypt_then_mac = |
| ssl->session->encrypt_then_mac; |
| #endif |
| |
| mbedtls_ssl_session_free( ssl->session ); |
| mbedtls_free( ssl->session ); |
| } |
| ssl->session = ssl->session_negotiate; |
| ssl->session_negotiate = NULL; |
| |
| /* |
| * Add cache entry |
| */ |
| if( ssl->conf->f_set_cache != NULL && |
| ssl->session->id_len != 0 && |
| resume == 0 ) |
| { |
| if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 ) |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->handshake->flight != NULL ) |
| { |
| /* Cancel handshake timer */ |
| ssl_set_timer( ssl, 0 ); |
| |
| /* Keep last flight around in case we need to resend it: |
| * we need the handshake and transform structures for that */ |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) ); |
| } |
| else |
| #endif |
| ssl_handshake_wrapup_free_hs_transform( ssl ); |
| |
| ssl->state++; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); |
| } |
| |
| int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) |
| { |
| int ret, hash_len; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); |
| |
| ssl_update_out_pointers( ssl, ssl->transform_negotiate ); |
| |
| ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint ); |
| |
| /* |
| * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites |
| * may define some other value. Currently (early 2016), no defined |
| * ciphersuite does this (and this is unlikely to change as activity has |
| * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. |
| */ |
| hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12; |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| ssl->verify_data_len = hash_len; |
| memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len ); |
| #endif |
| |
| ssl->out_msglen = 4 + hash_len; |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; |
| ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; |
| |
| /* |
| * In case of session resuming, invert the client and server |
| * ChangeCipherSpec messages order. |
| */ |
| if( ssl->handshake->resume != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; |
| #endif |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; |
| #endif |
| } |
| else |
| ssl->state++; |
| |
| /* |
| * Switch to our negotiated transform and session parameters for outbound |
| * data. |
| */ |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| unsigned char i; |
| |
| /* Remember current epoch settings for resending */ |
| ssl->handshake->alt_transform_out = ssl->transform_out; |
| memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8 ); |
| |
| /* Set sequence_number to zero */ |
| memset( ssl->cur_out_ctr + 2, 0, 6 ); |
| |
| /* Increment epoch */ |
| for( i = 2; i > 0; i-- ) |
| if( ++ssl->cur_out_ctr[i - 1] != 0 ) |
| break; |
| |
| /* The loop goes to its end iff the counter is wrapping */ |
| if( i == 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); |
| return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| memset( ssl->cur_out_ctr, 0, 8 ); |
| |
| ssl->transform_out = ssl->transform_negotiate; |
| ssl->session_out = ssl->session_negotiate; |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_activate != NULL ) |
| { |
| if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| mbedtls_ssl_send_flight_completed( ssl ); |
| #endif |
| |
| if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); |
| return( ret ); |
| } |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| #define SSL_MAX_HASH_LEN 36 |
| #else |
| #define SSL_MAX_HASH_LEN 12 |
| #endif |
| |
| int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| unsigned int hash_len; |
| unsigned char buf[SSL_MAX_HASH_LEN]; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); |
| |
| ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 ); |
| |
| if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); |
| return( ret ); |
| } |
| |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| |
| /* There is currently no ciphersuite using another length with TLS 1.2 */ |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| hash_len = 36; |
| else |
| #endif |
| hash_len = 12; |
| |
| if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED || |
| ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); |
| } |
| |
| if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), |
| buf, hash_len ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); |
| return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); |
| } |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| ssl->verify_data_len = hash_len; |
| memcpy( ssl->peer_verify_data, buf, hash_len ); |
| #endif |
| |
| if( ssl->handshake->resume != 0 ) |
| { |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; |
| #endif |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; |
| #endif |
| } |
| else |
| ssl->state++; |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| mbedtls_ssl_recv_flight_completed( ssl ); |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); |
| |
| return( 0 ); |
| } |
| |
| static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) |
| { |
| memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| mbedtls_md5_init( &handshake->fin_md5 ); |
| mbedtls_sha1_init( &handshake->fin_sha1 ); |
| mbedtls_md5_starts_ret( &handshake->fin_md5 ); |
| mbedtls_sha1_starts_ret( &handshake->fin_sha1 ); |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| mbedtls_sha256_init( &handshake->fin_sha256 ); |
| mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| mbedtls_sha512_init( &handshake->fin_sha512 ); |
| mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 ); |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| handshake->update_checksum = ssl_update_checksum_start; |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ |
| defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs ); |
| #endif |
| |
| #if defined(MBEDTLS_DHM_C) |
| mbedtls_dhm_init( &handshake->dhm_ctx ); |
| #endif |
| #if defined(MBEDTLS_ECDH_C) |
| mbedtls_ecdh_init( &handshake->ecdh_ctx ); |
| #endif |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| mbedtls_ecjpake_init( &handshake->ecjpake_ctx ); |
| #if defined(MBEDTLS_SSL_CLI_C) |
| handshake->ecjpake_cache = NULL; |
| handshake->ecjpake_cache_len = 0; |
| #endif |
| #endif |
| |
| #if defined(MBEDTLS_SSL__ECP_RESTARTABLE) |
| mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx ); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; |
| #endif |
| } |
| |
| static void ssl_transform_init( mbedtls_ssl_transform *transform ) |
| { |
| memset( transform, 0, sizeof(mbedtls_ssl_transform) ); |
| |
| mbedtls_cipher_init( &transform->cipher_ctx_enc ); |
| mbedtls_cipher_init( &transform->cipher_ctx_dec ); |
| |
| mbedtls_md_init( &transform->md_ctx_enc ); |
| mbedtls_md_init( &transform->md_ctx_dec ); |
| } |
| |
| void mbedtls_ssl_session_init( mbedtls_ssl_session *session ) |
| { |
| memset( session, 0, sizeof(mbedtls_ssl_session) ); |
| } |
| |
| static int ssl_handshake_init( mbedtls_ssl_context *ssl ) |
| { |
| /* Clear old handshake information if present */ |
| if( ssl->transform_negotiate ) |
| mbedtls_ssl_transform_free( ssl->transform_negotiate ); |
| if( ssl->session_negotiate ) |
| mbedtls_ssl_session_free( ssl->session_negotiate ); |
| if( ssl->handshake ) |
| mbedtls_ssl_handshake_free( ssl ); |
| |
| /* |
| * Either the pointers are now NULL or cleared properly and can be freed. |
| * Now allocate missing structures. |
| */ |
| if( ssl->transform_negotiate == NULL ) |
| { |
| ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) ); |
| } |
| |
| if( ssl->session_negotiate == NULL ) |
| { |
| ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) ); |
| } |
| |
| if( ssl->handshake == NULL ) |
| { |
| ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) ); |
| } |
| |
| /* All pointers should exist and can be directly freed without issue */ |
| if( ssl->handshake == NULL || |
| ssl->transform_negotiate == NULL || |
| ssl->session_negotiate == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) ); |
| |
| mbedtls_free( ssl->handshake ); |
| mbedtls_free( ssl->transform_negotiate ); |
| mbedtls_free( ssl->session_negotiate ); |
| |
| ssl->handshake = NULL; |
| ssl->transform_negotiate = NULL; |
| ssl->session_negotiate = NULL; |
| |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| |
| /* Initialize structures */ |
| mbedtls_ssl_session_init( ssl->session_negotiate ); |
| ssl_transform_init( ssl->transform_negotiate ); |
| ssl_handshake_params_init( ssl->handshake ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->handshake->alt_transform_out = ssl->transform_out; |
| |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; |
| else |
| ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; |
| |
| ssl_set_timer( ssl, 0 ); |
| } |
| #endif |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) |
| /* Dummy cookie callbacks for defaults */ |
| static int ssl_cookie_write_dummy( void *ctx, |
| unsigned char **p, unsigned char *end, |
| const unsigned char *cli_id, size_t cli_id_len ) |
| { |
| ((void) ctx); |
| ((void) p); |
| ((void) end); |
| ((void) cli_id); |
| ((void) cli_id_len); |
| |
| return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| } |
| |
| static int ssl_cookie_check_dummy( void *ctx, |
| const unsigned char *cookie, size_t cookie_len, |
| const unsigned char *cli_id, size_t cli_id_len ) |
| { |
| ((void) ctx); |
| ((void) cookie); |
| ((void) cookie_len); |
| ((void) cli_id); |
| ((void) cli_id_len); |
| |
| return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| } |
| #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ |
| |
| /* Once ssl->out_hdr as the address of the beginning of the |
| * next outgoing record is set, deduce the other pointers. |
| * |
| * Note: For TLS, we save the implicit record sequence number |
| * (entering MAC computation) in the 8 bytes before ssl->out_hdr, |
| * and the caller has to make sure there's space for this. |
| */ |
| |
| static void ssl_update_out_pointers( mbedtls_ssl_context *ssl, |
| mbedtls_ssl_transform *transform ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->out_ctr = ssl->out_hdr + 3; |
| ssl->out_len = ssl->out_hdr + 11; |
| ssl->out_iv = ssl->out_hdr + 13; |
| } |
| else |
| #endif |
| { |
| ssl->out_ctr = ssl->out_hdr - 8; |
| ssl->out_len = ssl->out_hdr + 3; |
| ssl->out_iv = ssl->out_hdr + 5; |
| } |
| |
| /* Adjust out_msg to make space for explicit IV, if used. */ |
| if( transform != NULL && |
| ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| ssl->out_msg = ssl->out_iv + transform->ivlen - transform->fixed_ivlen; |
| } |
| else |
| ssl->out_msg = ssl->out_iv; |
| } |
| |
| /* Once ssl->in_hdr as the address of the beginning of the |
| * next incoming record is set, deduce the other pointers. |
| * |
| * Note: For TLS, we save the implicit record sequence number |
| * (entering MAC computation) in the 8 bytes before ssl->in_hdr, |
| * and the caller has to make sure there's space for this. |
| */ |
| |
| static void ssl_update_in_pointers( mbedtls_ssl_context *ssl, |
| mbedtls_ssl_transform *transform ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->in_ctr = ssl->in_hdr + 3; |
| ssl->in_len = ssl->in_hdr + 11; |
| ssl->in_iv = ssl->in_hdr + 13; |
| } |
| else |
| #endif |
| { |
| ssl->in_ctr = ssl->in_hdr - 8; |
| ssl->in_len = ssl->in_hdr + 3; |
| ssl->in_iv = ssl->in_hdr + 5; |
| } |
| |
| /* Offset in_msg from in_iv to allow space for explicit IV, if used. */ |
| if( transform != NULL && |
| ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| { |
| ssl->in_msg = ssl->in_iv + transform->ivlen - transform->fixed_ivlen; |
| } |
| else |
| ssl->in_msg = ssl->in_iv; |
| } |
| |
| /* |
| * Initialize an SSL context |
| */ |
| void mbedtls_ssl_init( mbedtls_ssl_context *ssl ) |
| { |
| memset( ssl, 0, sizeof( mbedtls_ssl_context ) ); |
| } |
| |
| /* |
| * Setup an SSL context |
| */ |
| |
| static void ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl ) |
| { |
| /* Set the incoming and outgoing record pointers. */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| ssl->out_hdr = ssl->out_buf; |
| ssl->in_hdr = ssl->in_buf; |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| { |
| ssl->out_hdr = ssl->out_buf + 8; |
| ssl->in_hdr = ssl->in_buf + 8; |
| } |
| |
| /* Derive other internal pointers. */ |
| ssl_update_out_pointers( ssl, NULL /* no transform enabled */ ); |
| ssl_update_in_pointers ( ssl, NULL /* no transform enabled */ ); |
| } |
| |
| int mbedtls_ssl_setup( mbedtls_ssl_context *ssl, |
| const mbedtls_ssl_config *conf ) |
| { |
| int ret; |
| |
| ssl->conf = conf; |
| |
| /* |
| * Prepare base structures |
| */ |
| |
| /* Set to NULL in case of an error condition */ |
| ssl->out_buf = NULL; |
| |
| ssl->in_buf = mbedtls_calloc( 1, MBEDTLS_SSL_IN_BUFFER_LEN ); |
| if( ssl->in_buf == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_IN_BUFFER_LEN) ); |
| ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; |
| goto error; |
| } |
| |
| ssl->out_buf = mbedtls_calloc( 1, MBEDTLS_SSL_OUT_BUFFER_LEN ); |
| if( ssl->out_buf == NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_OUT_BUFFER_LEN) ); |
| ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; |
| goto error; |
| } |
| |
| ssl_reset_in_out_pointers( ssl ); |
| |
| if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) |
| goto error; |
| |
| return( 0 ); |
| |
| error: |
| mbedtls_free( ssl->in_buf ); |
| mbedtls_free( ssl->out_buf ); |
| |
| ssl->conf = NULL; |
| |
| ssl->in_buf = NULL; |
| ssl->out_buf = NULL; |
| |
| ssl->in_hdr = NULL; |
| ssl->in_ctr = NULL; |
| ssl->in_len = NULL; |
| ssl->in_iv = NULL; |
| ssl->in_msg = NULL; |
| |
| ssl->out_hdr = NULL; |
| ssl->out_ctr = NULL; |
| ssl->out_len = NULL; |
| ssl->out_iv = NULL; |
| ssl->out_msg = NULL; |
| |
| return( ret ); |
| } |
| |
| /* |
| * Reset an initialized and used SSL context for re-use while retaining |
| * all application-set variables, function pointers and data. |
| * |
| * If partial is non-zero, keep data in the input buffer and client ID. |
| * (Use when a DTLS client reconnects from the same port.) |
| */ |
| static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ) |
| { |
| int ret; |
| |
| #if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \ |
| !defined(MBEDTLS_SSL_SRV_C) |
| ((void) partial); |
| #endif |
| |
| ssl->state = MBEDTLS_SSL_HELLO_REQUEST; |
| |
| /* Cancel any possibly running timer */ |
| ssl_set_timer( ssl, 0 ); |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; |
| ssl->renego_records_seen = 0; |
| |
| ssl->verify_data_len = 0; |
| memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); |
| memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); |
| #endif |
| ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; |
| |
| ssl->in_offt = NULL; |
| ssl_reset_in_out_pointers( ssl ); |
| |
| ssl->in_msgtype = 0; |
| ssl->in_msglen = 0; |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| ssl->next_record_offset = 0; |
| ssl->in_epoch = 0; |
| #endif |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| ssl_dtls_replay_reset( ssl ); |
| #endif |
| |
| ssl->in_hslen = 0; |
| ssl->nb_zero = 0; |
| |
| ssl->keep_current_message = 0; |
| |
| ssl->out_msgtype = 0; |
| ssl->out_msglen = 0; |
| ssl->out_left = 0; |
| #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) |
| if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ) |
| ssl->split_done = 0; |
| #endif |
| |
| memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) ); |
| |
| ssl->transform_in = NULL; |
| ssl->transform_out = NULL; |
| |
| ssl->session_in = NULL; |
| ssl->session_out = NULL; |
| |
| memset( ssl->out_buf, 0, MBEDTLS_SSL_OUT_BUFFER_LEN ); |
| |
| #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) |
| if( partial == 0 ) |
| #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ |
| { |
| ssl->in_left = 0; |
| memset( ssl->in_buf, 0, MBEDTLS_SSL_IN_BUFFER_LEN ); |
| } |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_reset != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) ); |
| if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret ); |
| return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); |
| } |
| } |
| #endif |
| |
| if( ssl->transform ) |
| { |
| mbedtls_ssl_transform_free( ssl->transform ); |
| mbedtls_free( ssl->transform ); |
| ssl->transform = NULL; |
| } |
| |
| if( ssl->session ) |
| { |
| mbedtls_ssl_session_free( ssl->session ); |
| mbedtls_free( ssl->session ); |
| ssl->session = NULL; |
| } |
| |
| #if defined(MBEDTLS_SSL_ALPN) |
| ssl->alpn_chosen = NULL; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) |
| #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) |
| if( partial == 0 ) |
| #endif |
| { |
| mbedtls_free( ssl->cli_id ); |
| ssl->cli_id = NULL; |
| ssl->cli_id_len = 0; |
| } |
| #endif |
| |
| if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) |
| return( ret ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Reset an initialized and used SSL context for re-use while retaining |
| * all application-set variables, function pointers and data. |
| */ |
| int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl ) |
| { |
| return( ssl_session_reset_int( ssl, 0 ) ); |
| } |
| |
| /* |
| * SSL set accessors |
| */ |
| void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint ) |
| { |
| conf->endpoint = endpoint; |
| } |
| |
| void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport ) |
| { |
| conf->transport = transport; |
| } |
| |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode ) |
| { |
| conf->anti_replay = mode; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) |
| void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit ) |
| { |
| conf->badmac_limit = limit; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| |
| void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl, |
| unsigned allow_packing ) |
| { |
| ssl->disable_datagram_packing = !allow_packing; |
| } |
| |
| void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, |
| uint32_t min, uint32_t max ) |
| { |
| conf->hs_timeout_min = min; |
| conf->hs_timeout_max = max; |
| } |
| #endif |
| |
| void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode ) |
| { |
| conf->authmode = authmode; |
| } |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf, |
| int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), |
| void *p_vrfy ) |
| { |
| conf->f_vrfy = f_vrfy; |
| conf->p_vrfy = p_vrfy; |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| conf->f_rng = f_rng; |
| conf->p_rng = p_rng; |
| } |
| |
| void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf, |
| void (*f_dbg)(void *, int, const char *, int, const char *), |
| void *p_dbg ) |
| { |
| conf->f_dbg = f_dbg; |
| conf->p_dbg = p_dbg; |
| } |
| |
| void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl, |
| void *p_bio, |
| mbedtls_ssl_send_t *f_send, |
| mbedtls_ssl_recv_t *f_recv, |
| mbedtls_ssl_recv_timeout_t *f_recv_timeout ) |
| { |
| ssl->p_bio = p_bio; |
| ssl->f_send = f_send; |
| ssl->f_recv = f_recv; |
| ssl->f_recv_timeout = f_recv_timeout; |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu ) |
| { |
| ssl->mtu = mtu; |
| } |
| #endif |
| |
| void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout ) |
| { |
| conf->read_timeout = timeout; |
| } |
| |
| void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl, |
| void *p_timer, |
| mbedtls_ssl_set_timer_t *f_set_timer, |
| mbedtls_ssl_get_timer_t *f_get_timer ) |
| { |
| ssl->p_timer = p_timer; |
| ssl->f_set_timer = f_set_timer; |
| ssl->f_get_timer = f_get_timer; |
| |
| /* Make sure we start with no timer running */ |
| ssl_set_timer( ssl, 0 ); |
| } |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf, |
| void *p_cache, |
| int (*f_get_cache)(void *, mbedtls_ssl_session *), |
| int (*f_set_cache)(void *, const mbedtls_ssl_session *) ) |
| { |
| conf->p_cache = p_cache; |
| conf->f_get_cache = f_get_cache; |
| conf->f_set_cache = f_set_cache; |
| } |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session ) |
| { |
| int ret; |
| |
| if( ssl == NULL || |
| session == NULL || |
| ssl->session_negotiate == NULL || |
| ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) |
| { |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 ) |
| return( ret ); |
| |
| ssl->handshake->resume = 1; |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| |
| void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf, |
| const int *ciphersuites ) |
| { |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites; |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites; |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites; |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites; |
| } |
| |
| void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf, |
| const int *ciphersuites, |
| int major, int minor ) |
| { |
| if( major != MBEDTLS_SSL_MAJOR_VERSION_3 ) |
| return; |
| |
| if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 ) |
| return; |
| |
| conf->ciphersuite_list[minor] = ciphersuites; |
| } |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf, |
| const mbedtls_x509_crt_profile *profile ) |
| { |
| conf->cert_profile = profile; |
| } |
| |
| /* Append a new keycert entry to a (possibly empty) list */ |
| static int ssl_append_key_cert( mbedtls_ssl_key_cert **head, |
| mbedtls_x509_crt *cert, |
| mbedtls_pk_context *key ) |
| { |
| mbedtls_ssl_key_cert *new_cert; |
| |
| new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) ); |
| if( new_cert == NULL ) |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| |
| new_cert->cert = cert; |
| new_cert->key = key; |
| new_cert->next = NULL; |
| |
| /* Update head is the list was null, else add to the end */ |
| if( *head == NULL ) |
| { |
| *head = new_cert; |
| } |
| else |
| { |
| mbedtls_ssl_key_cert *cur = *head; |
| while( cur->next != NULL ) |
| cur = cur->next; |
| cur->next = new_cert; |
| } |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf, |
| mbedtls_x509_crt *own_cert, |
| mbedtls_pk_context *pk_key ) |
| { |
| return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) ); |
| } |
| |
| void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf, |
| mbedtls_x509_crt *ca_chain, |
| mbedtls_x509_crl *ca_crl ) |
| { |
| conf->ca_chain = ca_chain; |
| conf->ca_crl = ca_crl; |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl, |
| mbedtls_x509_crt *own_cert, |
| mbedtls_pk_context *pk_key ) |
| { |
| return( ssl_append_key_cert( &ssl->handshake->sni_key_cert, |
| own_cert, pk_key ) ); |
| } |
| |
| void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl, |
| mbedtls_x509_crt *ca_chain, |
| mbedtls_x509_crl *ca_crl ) |
| { |
| ssl->handshake->sni_ca_chain = ca_chain; |
| ssl->handshake->sni_ca_crl = ca_crl; |
| } |
| |
| void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl, |
| int authmode ) |
| { |
| ssl->handshake->sni_authmode = authmode; |
| } |
| #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| /* |
| * Set EC J-PAKE password for current handshake |
| */ |
| int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl, |
| const unsigned char *pw, |
| size_t pw_len ) |
| { |
| mbedtls_ecjpake_role role; |
| |
| if( ssl->handshake == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| role = MBEDTLS_ECJPAKE_SERVER; |
| else |
| role = MBEDTLS_ECJPAKE_CLIENT; |
| |
| return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx, |
| role, |
| MBEDTLS_MD_SHA256, |
| MBEDTLS_ECP_DP_SECP256R1, |
| pw, pw_len ) ); |
| } |
| #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) |
| int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf, |
| const unsigned char *psk, size_t psk_len, |
| const unsigned char *psk_identity, size_t psk_identity_len ) |
| { |
| if( psk == NULL || psk_identity == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| if( psk_len > MBEDTLS_PSK_MAX_LEN ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| /* Identity len will be encoded on two bytes */ |
| if( ( psk_identity_len >> 16 ) != 0 || |
| psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN ) |
| { |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| if( conf->psk != NULL ) |
| { |
| mbedtls_platform_zeroize( conf->psk, conf->psk_len ); |
| |
| mbedtls_free( conf->psk ); |
| conf->psk = NULL; |
| conf->psk_len = 0; |
| } |
| if( conf->psk_identity != NULL ) |
| { |
| mbedtls_free( conf->psk_identity ); |
| conf->psk_identity = NULL; |
| conf->psk_identity_len = 0; |
| } |
| |
| if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL || |
| ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL ) |
| { |
| mbedtls_free( conf->psk ); |
| mbedtls_free( conf->psk_identity ); |
| conf->psk = NULL; |
| conf->psk_identity = NULL; |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| } |
| |
| conf->psk_len = psk_len; |
| conf->psk_identity_len = psk_identity_len; |
| |
| memcpy( conf->psk, psk, conf->psk_len ); |
| memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl, |
| const unsigned char *psk, size_t psk_len ) |
| { |
| if( psk == NULL || ssl->handshake == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| if( psk_len > MBEDTLS_PSK_MAX_LEN ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| if( ssl->handshake->psk != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->handshake->psk, |
| ssl->handshake->psk_len ); |
| mbedtls_free( ssl->handshake->psk ); |
| ssl->handshake->psk_len = 0; |
| } |
| |
| if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| |
| ssl->handshake->psk_len = psk_len; |
| memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len ); |
| |
| return( 0 ); |
| } |
| |
| void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf, |
| int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, |
| size_t), |
| void *p_psk ) |
| { |
| conf->f_psk = f_psk; |
| conf->p_psk = p_psk; |
| } |
| #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ |
| |
| #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) |
| |
| #if !defined(MBEDTLS_DEPRECATED_REMOVED) |
| int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 || |
| ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 ) |
| { |
| mbedtls_mpi_free( &conf->dhm_P ); |
| mbedtls_mpi_free( &conf->dhm_G ); |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_DEPRECATED_REMOVED */ |
| |
| int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf, |
| const unsigned char *dhm_P, size_t P_len, |
| const unsigned char *dhm_G, size_t G_len ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 || |
| ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 ) |
| { |
| mbedtls_mpi_free( &conf->dhm_P ); |
| mbedtls_mpi_free( &conf->dhm_G ); |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 || |
| ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 ) |
| { |
| mbedtls_mpi_free( &conf->dhm_P ); |
| mbedtls_mpi_free( &conf->dhm_G ); |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ |
| |
| #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) |
| /* |
| * Set the minimum length for Diffie-Hellman parameters |
| */ |
| void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf, |
| unsigned int bitlen ) |
| { |
| conf->dhm_min_bitlen = bitlen; |
| } |
| #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| /* |
| * Set allowed/preferred hashes for handshake signatures |
| */ |
| void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf, |
| const int *hashes ) |
| { |
| conf->sig_hashes = hashes; |
| } |
| #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ |
| |
| #if defined(MBEDTLS_ECP_C) |
| /* |
| * Set the allowed elliptic curves |
| */ |
| void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, |
| const mbedtls_ecp_group_id *curve_list ) |
| { |
| conf->curve_list = curve_list; |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname ) |
| { |
| /* Initialize to suppress unnecessary compiler warning */ |
| size_t hostname_len = 0; |
| |
| /* Check if new hostname is valid before |
| * making any change to current one */ |
| if( hostname != NULL ) |
| { |
| hostname_len = strlen( hostname ); |
| |
| if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| /* Now it's clear that we will overwrite the old hostname, |
| * so we can free it safely */ |
| |
| if( ssl->hostname != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); |
| mbedtls_free( ssl->hostname ); |
| } |
| |
| /* Passing NULL as hostname shall clear the old one */ |
| |
| if( hostname == NULL ) |
| { |
| ssl->hostname = NULL; |
| } |
| else |
| { |
| ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 ); |
| if( ssl->hostname == NULL ) |
| return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); |
| |
| memcpy( ssl->hostname, hostname, hostname_len ); |
| |
| ssl->hostname[hostname_len] = '\0'; |
| } |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf, |
| int (*f_sni)(void *, mbedtls_ssl_context *, |
| const unsigned char *, size_t), |
| void *p_sni ) |
| { |
| conf->f_sni = f_sni; |
| conf->p_sni = p_sni; |
| } |
| #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| |
| #if defined(MBEDTLS_SSL_ALPN) |
| int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos ) |
| { |
| size_t cur_len, tot_len; |
| const char **p; |
| |
| /* |
| * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings |
| * MUST NOT be truncated." |
| * We check lengths now rather than later. |
| */ |
| tot_len = 0; |
| for( p = protos; *p != NULL; p++ ) |
| { |
| cur_len = strlen( *p ); |
| tot_len += cur_len; |
| |
| if( cur_len == 0 || cur_len > 255 || tot_len > 65535 ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| conf->alpn_list = protos; |
| |
| return( 0 ); |
| } |
| |
| const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl ) |
| { |
| return( ssl->alpn_chosen ); |
| } |
| #endif /* MBEDTLS_SSL_ALPN */ |
| |
| void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor ) |
| { |
| conf->max_major_ver = major; |
| conf->max_minor_ver = minor; |
| } |
| |
| void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor ) |
| { |
| conf->min_major_ver = major; |
| conf->min_minor_ver = minor; |
| } |
| |
| #if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C) |
| void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback ) |
| { |
| conf->fallback = fallback; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf, |
| char cert_req_ca_list ) |
| { |
| conf->cert_req_ca_list = cert_req_ca_list; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm ) |
| { |
| conf->encrypt_then_mac = etm; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) |
| void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems ) |
| { |
| conf->extended_ms = ems; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_ARC4_C) |
| void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 ) |
| { |
| conf->arc4_disabled = arc4; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) |
| int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code ) |
| { |
| if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || |
| ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ) |
| { |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| conf->mfl_code = mfl_code; |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ |
| |
| #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) |
| void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate ) |
| { |
| conf->trunc_hmac = truncate; |
| } |
| #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ |
| |
| #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) |
| void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split ) |
| { |
| conf->cbc_record_splitting = split; |
| } |
| #endif |
| |
| void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy ) |
| { |
| conf->allow_legacy_renegotiation = allow_legacy; |
| } |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation ) |
| { |
| conf->disable_renegotiation = renegotiation; |
| } |
| |
| void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records ) |
| { |
| conf->renego_max_records = max_records; |
| } |
| |
| void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf, |
| const unsigned char period[8] ) |
| { |
| memcpy( conf->renego_period, period, 8 ); |
| } |
| #endif /* MBEDTLS_SSL_RENEGOTIATION */ |
| |
| #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| #if defined(MBEDTLS_SSL_CLI_C) |
| void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets ) |
| { |
| conf->session_tickets = use_tickets; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf, |
| mbedtls_ssl_ticket_write_t *f_ticket_write, |
| mbedtls_ssl_ticket_parse_t *f_ticket_parse, |
| void *p_ticket ) |
| { |
| conf->f_ticket_write = f_ticket_write; |
| conf->f_ticket_parse = f_ticket_parse; |
| conf->p_ticket = p_ticket; |
| } |
| #endif |
| #endif /* MBEDTLS_SSL_SESSION_TICKETS */ |
| |
| #if defined(MBEDTLS_SSL_EXPORT_KEYS) |
| void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf, |
| mbedtls_ssl_export_keys_t *f_export_keys, |
| void *p_export_keys ) |
| { |
| conf->f_export_keys = f_export_keys; |
| conf->p_export_keys = p_export_keys; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) |
| void mbedtls_ssl_conf_async_private_cb( |
| mbedtls_ssl_config *conf, |
| mbedtls_ssl_async_sign_t *f_async_sign, |
| mbedtls_ssl_async_decrypt_t *f_async_decrypt, |
| mbedtls_ssl_async_resume_t *f_async_resume, |
| mbedtls_ssl_async_cancel_t *f_async_cancel, |
| void *async_config_data ) |
| { |
| conf->f_async_sign_start = f_async_sign; |
| conf->f_async_decrypt_start = f_async_decrypt; |
| conf->f_async_resume = f_async_resume; |
| conf->f_async_cancel = f_async_cancel; |
| conf->p_async_config_data = async_config_data; |
| } |
| |
| void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf ) |
| { |
| return( conf->p_async_config_data ); |
| } |
| |
| void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->handshake == NULL ) |
| return( NULL ); |
| else |
| return( ssl->handshake->user_async_ctx ); |
| } |
| |
| void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl, |
| void *ctx ) |
| { |
| if( ssl->handshake != NULL ) |
| ssl->handshake->user_async_ctx = ctx; |
| } |
| #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ |
| |
| /* |
| * SSL get accessors |
| */ |
| size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl ) |
| { |
| return( ssl->in_offt == NULL ? 0 : ssl->in_msglen ); |
| } |
| |
| int mbedtls_ssl_check_pending( const mbedtls_ssl_context *ssl ) |
| { |
| /* |
| * Case A: We're currently holding back |
| * a message for further processing. |
| */ |
| |
| if( ssl->keep_current_message == 1 ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: record held back for processing" ) ); |
| return( 1 ); |
| } |
| |
| /* |
| * Case B: Further records are pending in the current datagram. |
| */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->in_left > ssl->next_record_offset ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more records within current datagram" ) ); |
| return( 1 ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| /* |
| * Case C: A handshake message is being processed. |
| */ |
| |
| if( ssl->in_hslen > 0 && ssl->in_hslen < ssl->in_msglen ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more handshake messages within current record" ) ); |
| return( 1 ); |
| } |
| |
| /* |
| * Case D: An application data message is being processed |
| */ |
| if( ssl->in_offt != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: application data record is being processed" ) ); |
| return( 1 ); |
| } |
| |
| /* |
| * In all other cases, the rest of the message can be dropped. |
| * As in ssl_get_next_record, this needs to be adapted if |
| * we implement support for multiple alerts in single records. |
| */ |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: nothing pending" ) ); |
| return( 0 ); |
| } |
| |
| uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl ) |
| { |
| if( ssl->session != NULL ) |
| return( ssl->session->verify_result ); |
| |
| if( ssl->session_negotiate != NULL ) |
| return( ssl->session_negotiate->verify_result ); |
| |
| return( 0xFFFFFFFF ); |
| } |
| |
| const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl ) |
| { |
| if( ssl == NULL || ssl->session == NULL ) |
| return( NULL ); |
| |
| return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite ); |
| } |
| |
| const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| switch( ssl->minor_ver ) |
| { |
| case MBEDTLS_SSL_MINOR_VERSION_2: |
| return( "DTLSv1.0" ); |
| |
| case MBEDTLS_SSL_MINOR_VERSION_3: |
| return( "DTLSv1.2" ); |
| |
| default: |
| return( "unknown (DTLS)" ); |
| } |
| } |
| #endif |
| |
| switch( ssl->minor_ver ) |
| { |
| case MBEDTLS_SSL_MINOR_VERSION_0: |
| return( "SSLv3.0" ); |
| |
| case MBEDTLS_SSL_MINOR_VERSION_1: |
| return( "TLSv1.0" ); |
| |
| case MBEDTLS_SSL_MINOR_VERSION_2: |
| return( "TLSv1.1" ); |
| |
| case MBEDTLS_SSL_MINOR_VERSION_3: |
| return( "TLSv1.2" ); |
| |
| default: |
| return( "unknown" ); |
| } |
| } |
| |
| int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl ) |
| { |
| size_t transform_expansion = 0; |
| const mbedtls_ssl_transform *transform = ssl->transform_out; |
| unsigned block_size; |
| |
| if( transform == NULL ) |
| return( (int) mbedtls_ssl_hdr_len( ssl ) ); |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL ) |
| return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| #endif |
| |
| switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) ) |
| { |
| case MBEDTLS_MODE_GCM: |
| case MBEDTLS_MODE_CCM: |
| case MBEDTLS_MODE_CHACHAPOLY: |
| case MBEDTLS_MODE_STREAM: |
| transform_expansion = transform->minlen; |
| break; |
| |
| case MBEDTLS_MODE_CBC: |
| |
| block_size = mbedtls_cipher_get_block_size( |
| &transform->cipher_ctx_enc ); |
| |
| /* Expansion due to the addition of the MAC. */ |
| transform_expansion += transform->maclen; |
| |
| /* Expansion due to the addition of CBC padding; |
| * Theoretically up to 256 bytes, but we never use |
| * more than the block size of the underlying cipher. */ |
| transform_expansion += block_size; |
| |
| /* For TLS 1.1 or higher, an explicit IV is added |
| * after the record header. */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) |
| transform_expansion += block_size; |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| break; |
| |
| default: |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| |
| return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) ); |
| } |
| |
| #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) |
| size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl ) |
| { |
| size_t max_len; |
| |
| /* |
| * Assume mfl_code is correct since it was checked when set |
| */ |
| max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code ); |
| |
| /* Check if a smaller max length was negotiated */ |
| if( ssl->session_out != NULL && |
| ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len ) |
| { |
| max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code ); |
| } |
| |
| /* During a handshake, use the value being negotiated */ |
| if( ssl->session_negotiate != NULL && |
| ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len ) |
| { |
| max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ); |
| } |
| |
| return( max_len ); |
| } |
| #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl ) |
| { |
| /* Return unlimited mtu for client hello messages to avoid fragmentation. */ |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && |
| ( ssl->state == MBEDTLS_SSL_CLIENT_HELLO || |
| ssl->state == MBEDTLS_SSL_SERVER_HELLO ) ) |
| return ( 0 ); |
| |
| if( ssl->handshake == NULL || ssl->handshake->mtu == 0 ) |
| return( ssl->mtu ); |
| |
| if( ssl->mtu == 0 ) |
| return( ssl->handshake->mtu ); |
| |
| return( ssl->mtu < ssl->handshake->mtu ? |
| ssl->mtu : ssl->handshake->mtu ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl ) |
| { |
| size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; |
| |
| #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ |
| !defined(MBEDTLS_SSL_PROTO_DTLS) |
| (void) ssl; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) |
| const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl ); |
| |
| if( max_len > mfl ) |
| max_len = mfl; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl_get_current_mtu( ssl ) != 0 ) |
| { |
| const size_t mtu = ssl_get_current_mtu( ssl ); |
| const int ret = mbedtls_ssl_get_record_expansion( ssl ); |
| const size_t overhead = (size_t) ret; |
| |
| if( ret < 0 ) |
| return( ret ); |
| |
| if( mtu <= overhead ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) ); |
| return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); |
| } |
| |
| if( max_len > mtu - overhead ) |
| max_len = mtu - overhead; |
| } |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ |
| !defined(MBEDTLS_SSL_PROTO_DTLS) |
| ((void) ssl); |
| #endif |
| |
| return( (int) max_len ); |
| } |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl ) |
| { |
| if( ssl == NULL || ssl->session == NULL ) |
| return( NULL ); |
| |
| return( ssl->session->peer_cert ); |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst ) |
| { |
| if( ssl == NULL || |
| dst == NULL || |
| ssl->session == NULL || |
| ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) |
| { |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| return( ssl_session_copy( dst, ssl->session ) ); |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| |
| /* |
| * Perform a single step of the SSL handshake |
| */ |
| int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl ) |
| { |
| int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| ret = mbedtls_ssl_handshake_client_step( ssl ); |
| #endif |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| ret = mbedtls_ssl_handshake_server_step( ssl ); |
| #endif |
| |
| return( ret ); |
| } |
| |
| /* |
| * Perform the SSL handshake |
| */ |
| int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl ) |
| { |
| int ret = 0; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); |
| |
| while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| ret = mbedtls_ssl_handshake_step( ssl ); |
| |
| if( ret != 0 ) |
| break; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); |
| |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| #if defined(MBEDTLS_SSL_SRV_C) |
| /* |
| * Write HelloRequest to request renegotiation on server |
| */ |
| static int ssl_write_hello_request( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) ); |
| |
| ssl->out_msglen = 4; |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; |
| ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; |
| |
| if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) ); |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| |
| /* |
| * Actually renegotiate current connection, triggered by either: |
| * - any side: calling mbedtls_ssl_renegotiate(), |
| * - client: receiving a HelloRequest during mbedtls_ssl_read(), |
| * - server: receiving any handshake message on server during mbedtls_ssl_read() after |
| * the initial handshake is completed. |
| * If the handshake doesn't complete due to waiting for I/O, it will continue |
| * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. |
| */ |
| static int ssl_start_renegotiation( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) ); |
| |
| if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) |
| return( ret ); |
| |
| /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and |
| * the ServerHello will have message_seq = 1" */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) |
| { |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| ssl->handshake->out_msg_seq = 1; |
| else |
| ssl->handshake->in_msg_seq = 1; |
| } |
| #endif |
| |
| ssl->state = MBEDTLS_SSL_HELLO_REQUEST; |
| ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; |
| |
| if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); |
| return( ret ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Renegotiate current connection on client, |
| * or request renegotiation on server |
| */ |
| int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) |
| { |
| int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| /* On server, just send the request */ |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; |
| |
| /* Did we already try/start sending HelloRequest? */ |
| if( ssl->out_left != 0 ) |
| return( mbedtls_ssl_flush_output( ssl ) ); |
| |
| return( ssl_write_hello_request( ssl ) ); |
| } |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| /* |
| * On client, either start the renegotiation process or, |
| * if already in progress, continue the handshake |
| */ |
| if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) |
| { |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); |
| return( ret ); |
| } |
| } |
| else |
| { |
| if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); |
| return( ret ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| |
| return( ret ); |
| } |
| |
| /* |
| * Check record counters and renegotiate if they're above the limit. |
| */ |
| static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl ) |
| { |
| size_t ep_len = ssl_ep_len( ssl ); |
| int in_ctr_cmp; |
| int out_ctr_cmp; |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER || |
| ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING || |
| ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ) |
| { |
| return( 0 ); |
| } |
| |
| in_ctr_cmp = memcmp( ssl->in_ctr + ep_len, |
| ssl->conf->renego_period + ep_len, 8 - ep_len ); |
| out_ctr_cmp = memcmp( ssl->cur_out_ctr + ep_len, |
| ssl->conf->renego_period + ep_len, 8 - ep_len ); |
| |
| if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 ) |
| { |
| return( 0 ); |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) ); |
| return( mbedtls_ssl_renegotiate( ssl ) ); |
| } |
| #endif /* MBEDTLS_SSL_RENEGOTIATION */ |
| |
| /* |
| * Receive application data decrypted from the SSL layer |
| */ |
| int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len ) |
| { |
| int ret; |
| size_t n; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| return( ret ); |
| |
| if( ssl->handshake != NULL && |
| ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) |
| { |
| if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) |
| return( ret ); |
| } |
| } |
| #endif |
| |
| /* |
| * Check if renegotiation is necessary and/or handshake is |
| * in process. If yes, perform/continue, and fall through |
| * if an unexpected packet is received while the client |
| * is waiting for the ServerHello. |
| * |
| * (There is no equivalent to the last condition on |
| * the server-side as it is not treated as within |
| * a handshake while waiting for the ClientHello |
| * after a renegotiation request.) |
| */ |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| ret = ssl_check_ctr_renegotiate( ssl ); |
| if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && |
| ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); |
| return( ret ); |
| } |
| #endif |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| ret = mbedtls_ssl_handshake( ssl ); |
| if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && |
| ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); |
| return( ret ); |
| } |
| } |
| |
| /* Loop as long as no application data record is available */ |
| while( ssl->in_offt == NULL ) |
| { |
| /* Start timer if not already running */ |
| if( ssl->f_get_timer != NULL && |
| ssl->f_get_timer( ssl->p_timer ) == -1 ) |
| { |
| ssl_set_timer( ssl, ssl->conf->read_timeout ); |
| } |
| |
| if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) |
| { |
| if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) |
| return( 0 ); |
| |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); |
| return( ret ); |
| } |
| |
| if( ssl->in_msglen == 0 && |
| ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA ) |
| { |
| /* |
| * OpenSSL sends empty messages to randomize the IV |
| */ |
| if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) |
| { |
| if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) |
| return( 0 ); |
| |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); |
| return( ret ); |
| } |
| } |
| |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) ); |
| |
| /* |
| * - For client-side, expect SERVER_HELLO_REQUEST. |
| * - For server-side, expect CLIENT_HELLO. |
| * - Fail (TLS) or silently drop record (DTLS) in other cases. |
| */ |
| |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && |
| ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST || |
| ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) ); |
| |
| /* With DTLS, drop the packet (probably from last handshake) */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| continue; |
| } |
| #endif |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| #endif /* MBEDTLS_SSL_CLI_C */ |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) ); |
| |
| /* With DTLS, drop the packet (probably from last handshake) */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| continue; |
| } |
| #endif |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| #endif /* MBEDTLS_SSL_SRV_C */ |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| /* Determine whether renegotiation attempt should be accepted */ |
| if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED || |
| ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && |
| ssl->conf->allow_legacy_renegotiation == |
| MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) ) |
| { |
| /* |
| * Accept renegotiation request |
| */ |
| |
| /* DTLS clients need to know renego is server-initiated */ |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && |
| ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| { |
| ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; |
| } |
| #endif |
| ret = ssl_start_renegotiation( ssl ); |
| if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && |
| ret != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); |
| return( ret ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_RENEGOTIATION */ |
| { |
| /* |
| * Refuse renegotiation |
| */ |
| |
| MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) |
| if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) |
| { |
| /* SSLv3 does not have a "no_renegotiation" warning, so |
| we send a fatal alert and abort the connection. */ |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 */ |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) |
| { |
| if( ( ret = mbedtls_ssl_send_alert_message( ssl, |
| MBEDTLS_SSL_ALERT_LEVEL_WARNING, |
| MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| } |
| else |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || |
| MBEDTLS_SSL_PROTO_TLS1_2 */ |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); |
| return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); |
| } |
| } |
| |
| /* At this point, we don't know whether the renegotiation has been |
| * completed or not. The cases to consider are the following: |
| * 1) The renegotiation is complete. In this case, no new record |
| * has been read yet. |
| * 2) The renegotiation is incomplete because the client received |
| * an application data record while awaiting the ServerHello. |
| * 3) The renegotiation is incomplete because the client received |
| * a non-handshake, non-application data message while awaiting |
| * the ServerHello. |
| * In each of these case, looping will be the proper action: |
| * - For 1), the next iteration will read a new record and check |
| * if it's application data. |
| * - For 2), the loop condition isn't satisfied as application data |
| * is present, hence continue is the same as break |
| * - For 3), the loop condition is satisfied and read_record |
| * will re-deliver the message that was held back by the client |
| * when expecting the ServerHello. |
| */ |
| continue; |
| } |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) |
| { |
| if( ssl->conf->renego_max_records >= 0 ) |
| { |
| if( ++ssl->renego_records_seen > ssl->conf->renego_max_records ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, " |
| "but not honored by client" ) ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| } |
| } |
| #endif /* MBEDTLS_SSL_RENEGOTIATION */ |
| |
| /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */ |
| if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) ); |
| return( MBEDTLS_ERR_SSL_WANT_READ ); |
| } |
| |
| if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) ); |
| return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); |
| } |
| |
| ssl->in_offt = ssl->in_msg; |
| |
| /* We're going to return something now, cancel timer, |
| * except if handshake (renegotiation) is in progress */ |
| if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) |
| ssl_set_timer( ssl, 0 ); |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| /* If we requested renego but received AppData, resend HelloRequest. |
| * Do it now, after setting in_offt, to avoid taking this branch |
| * again if ssl_write_hello_request() returns WANT_WRITE */ |
| #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) |
| if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && |
| ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) |
| { |
| if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret ); |
| return( ret ); |
| } |
| } |
| #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| } |
| |
| n = ( len < ssl->in_msglen ) |
| ? len : ssl->in_msglen; |
| |
| memcpy( buf, ssl->in_offt, n ); |
| ssl->in_msglen -= n; |
| |
| if( ssl->in_msglen == 0 ) |
| { |
| /* all bytes consumed */ |
| ssl->in_offt = NULL; |
| ssl->keep_current_message = 0; |
| } |
| else |
| { |
| /* more data available */ |
| ssl->in_offt += n; |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) ); |
| |
| return( (int) n ); |
| } |
| |
| /* |
| * Send application data to be encrypted by the SSL layer, taking care of max |
| * fragment length and buffer size. |
| * |
| * According to RFC 5246 Section 6.2.1: |
| * |
| * Zero-length fragments of Application data MAY be sent as they are |
| * potentially useful as a traffic analysis countermeasure. |
| * |
| * Therefore, it is possible that the input message length is 0 and the |
| * corresponding return code is 0 on success. |
| */ |
| static int ssl_write_real( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| int ret = mbedtls_ssl_get_max_out_record_payload( ssl ); |
| const size_t max_len = (size_t) ret; |
| |
| if( ret < 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_max_out_record_payload", ret ); |
| return( ret ); |
| } |
| |
| if( len > max_len ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) " |
| "maximum fragment length: %d > %d", |
| len, max_len ) ); |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| else |
| #endif |
| len = max_len; |
| } |
| |
| if( ssl->out_left != 0 ) |
| { |
| /* |
| * The user has previously tried to send the data and |
| * MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially |
| * written. In this case, we expect the high-level write function |
| * (e.g. mbedtls_ssl_write()) to be called with the same parameters |
| */ |
| if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); |
| return( ret ); |
| } |
| } |
| else |
| { |
| /* |
| * The user is trying to send a message the first time, so we need to |
| * copy the data into the internal buffers and setup the data structure |
| * to keep track of partial writes |
| */ |
| ssl->out_msglen = len; |
| ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA; |
| memcpy( ssl->out_msg, buf, len ); |
| |
| if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); |
| return( ret ); |
| } |
| } |
| |
| return( (int) len ); |
| } |
| |
| /* |
| * Write application data, doing 1/n-1 splitting if necessary. |
| * |
| * With non-blocking I/O, ssl_write_real() may return WANT_WRITE, |
| * then the caller will call us again with the same arguments, so |
| * remember whether we already did the split or not. |
| */ |
| #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) |
| static int ssl_write_split( mbedtls_ssl_context *ssl, |
| const unsigned char *buf, size_t len ) |
| { |
| int ret; |
| |
| if( ssl->conf->cbc_record_splitting == |
| MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED || |
| len <= 1 || |
| ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 || |
| mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc ) |
| != MBEDTLS_MODE_CBC ) |
| { |
| return( ssl_write_real( ssl, buf, len ) ); |
| } |
| |
| if( ssl->split_done == 0 ) |
| { |
| if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 ) |
| return( ret ); |
| ssl->split_done = 1; |
| } |
| |
| if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 ) |
| return( ret ); |
| ssl->split_done = 0; |
| |
| return( ret + 1 ); |
| } |
| #endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */ |
| |
| /* |
| * Write application data (public-facing wrapper) |
| */ |
| int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) |
| { |
| int ret; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) ); |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); |
| return( ret ); |
| } |
| #endif |
| |
| if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); |
| return( ret ); |
| } |
| } |
| |
| #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) |
| ret = ssl_write_split( ssl, buf, len ); |
| #else |
| ret = ssl_write_real( ssl, buf, len ); |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) ); |
| |
| return( ret ); |
| } |
| |
| /* |
| * Notify the peer that the connection is being closed |
| */ |
| int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl ) |
| { |
| int ret; |
| |
| if( ssl == NULL || ssl->conf == NULL ) |
| return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) ); |
| |
| if( ssl->out_left != 0 ) |
| return( mbedtls_ssl_flush_output( ssl ) ); |
| |
| if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) |
| { |
| if( ( ret = mbedtls_ssl_send_alert_message( ssl, |
| MBEDTLS_SSL_ALERT_LEVEL_WARNING, |
| MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret ); |
| return( ret ); |
| } |
| } |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) ); |
| |
| return( 0 ); |
| } |
| |
| void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform ) |
| { |
| if( transform == NULL ) |
| return; |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| deflateEnd( &transform->ctx_deflate ); |
| inflateEnd( &transform->ctx_inflate ); |
| #endif |
| |
| mbedtls_cipher_free( &transform->cipher_ctx_enc ); |
| mbedtls_cipher_free( &transform->cipher_ctx_dec ); |
| |
| mbedtls_md_free( &transform->md_ctx_enc ); |
| mbedtls_md_free( &transform->md_ctx_dec ); |
| |
| mbedtls_platform_zeroize( transform, sizeof( mbedtls_ssl_transform ) ); |
| } |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) |
| { |
| mbedtls_ssl_key_cert *cur = key_cert, *next; |
| |
| while( cur != NULL ) |
| { |
| next = cur->next; |
| mbedtls_free( cur ); |
| cur = next; |
| } |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| |
| static void ssl_buffering_free( mbedtls_ssl_context *ssl ) |
| { |
| unsigned offset; |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| |
| if( hs == NULL ) |
| return; |
| |
| ssl_free_buffered_record( ssl ); |
| |
| for( offset = 0; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ ) |
| ssl_buffering_free_slot( ssl, offset ); |
| } |
| |
| static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl, |
| uint8_t slot ) |
| { |
| mbedtls_ssl_handshake_params * const hs = ssl->handshake; |
| mbedtls_ssl_hs_buffer * const hs_buf = &hs->buffering.hs[slot]; |
| |
| if( slot >= MBEDTLS_SSL_MAX_BUFFERED_HS ) |
| return; |
| |
| if( hs_buf->is_valid == 1 ) |
| { |
| hs->buffering.total_bytes_buffered -= hs_buf->data_len; |
| mbedtls_platform_zeroize( hs_buf->data, hs_buf->data_len ); |
| mbedtls_free( hs_buf->data ); |
| memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) ); |
| } |
| } |
| |
| #endif /* MBEDTLS_SSL_PROTO_DTLS */ |
| |
| void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl ) |
| { |
| mbedtls_ssl_handshake_params *handshake = ssl->handshake; |
| |
| if( handshake == NULL ) |
| return; |
| |
| #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) |
| if( ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0 ) |
| { |
| ssl->conf->f_async_cancel( ssl ); |
| handshake->async_in_progress = 0; |
| } |
| #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| mbedtls_md5_free( &handshake->fin_md5 ); |
| mbedtls_sha1_free( &handshake->fin_sha1 ); |
| #endif |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| #if defined(MBEDTLS_SHA256_C) |
| mbedtls_sha256_free( &handshake->fin_sha256 ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| mbedtls_sha512_free( &handshake->fin_sha512 ); |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| #if defined(MBEDTLS_DHM_C) |
| mbedtls_dhm_free( &handshake->dhm_ctx ); |
| #endif |
| #if defined(MBEDTLS_ECDH_C) |
| mbedtls_ecdh_free( &handshake->ecdh_ctx ); |
| #endif |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| mbedtls_ecjpake_free( &handshake->ecjpake_ctx ); |
| #if defined(MBEDTLS_SSL_CLI_C) |
| mbedtls_free( handshake->ecjpake_cache ); |
| handshake->ecjpake_cache = NULL; |
| handshake->ecjpake_cache_len = 0; |
| #endif |
| #endif |
| |
| #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ |
| defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| /* explicit void pointer cast for buggy MS compiler */ |
| mbedtls_free( (void *) handshake->curves ); |
| #endif |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) |
| if( handshake->psk != NULL ) |
| { |
| mbedtls_platform_zeroize( handshake->psk, handshake->psk_len ); |
| mbedtls_free( handshake->psk ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ |
| defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) |
| /* |
| * Free only the linked list wrapper, not the keys themselves |
| * since the belong to the SNI callback |
| */ |
| if( handshake->sni_key_cert != NULL ) |
| { |
| mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; |
| |
| while( cur != NULL ) |
| { |
| next = cur->next; |
| mbedtls_free( cur ); |
| cur = next; |
| } |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ |
| |
| #if defined(MBEDTLS_SSL__ECP_RESTARTABLE) |
| mbedtls_x509_crt_restart_free( &handshake->ecrs_ctx ); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| mbedtls_free( handshake->verify_cookie ); |
| ssl_flight_free( handshake->flight ); |
| ssl_buffering_free( ssl ); |
| #endif |
| |
| mbedtls_platform_zeroize( handshake, |
| sizeof( mbedtls_ssl_handshake_params ) ); |
| } |
| |
| void mbedtls_ssl_session_free( mbedtls_ssl_session *session ) |
| { |
| if( session == NULL ) |
| return; |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| if( session->peer_cert != NULL ) |
| { |
| mbedtls_x509_crt_free( session->peer_cert ); |
| mbedtls_free( session->peer_cert ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) |
| mbedtls_free( session->ticket ); |
| #endif |
| |
| mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) ); |
| } |
| |
| /* |
| * Free an SSL context |
| */ |
| void mbedtls_ssl_free( mbedtls_ssl_context *ssl ) |
| { |
| if( ssl == NULL ) |
| return; |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) ); |
| |
| if( ssl->out_buf != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN ); |
| mbedtls_free( ssl->out_buf ); |
| } |
| |
| if( ssl->in_buf != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN ); |
| mbedtls_free( ssl->in_buf ); |
| } |
| |
| #if defined(MBEDTLS_ZLIB_SUPPORT) |
| if( ssl->compress_buf != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); |
| mbedtls_free( ssl->compress_buf ); |
| } |
| #endif |
| |
| if( ssl->transform ) |
| { |
| mbedtls_ssl_transform_free( ssl->transform ); |
| mbedtls_free( ssl->transform ); |
| } |
| |
| if( ssl->handshake ) |
| { |
| mbedtls_ssl_handshake_free( ssl ); |
| mbedtls_ssl_transform_free( ssl->transform_negotiate ); |
| mbedtls_ssl_session_free( ssl->session_negotiate ); |
| |
| mbedtls_free( ssl->handshake ); |
| mbedtls_free( ssl->transform_negotiate ); |
| mbedtls_free( ssl->session_negotiate ); |
| } |
| |
| if( ssl->session ) |
| { |
| mbedtls_ssl_session_free( ssl->session ); |
| mbedtls_free( ssl->session ); |
| } |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| if( ssl->hostname != NULL ) |
| { |
| mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); |
| mbedtls_free( ssl->hostname ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) |
| if( mbedtls_ssl_hw_record_finish != NULL ) |
| { |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) ); |
| mbedtls_ssl_hw_record_finish( ssl ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) |
| mbedtls_free( ssl->cli_id ); |
| #endif |
| |
| MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) ); |
| |
| /* Actually clear after last debug message */ |
| mbedtls_platform_zeroize( ssl, sizeof( mbedtls_ssl_context ) ); |
| } |
| |
| /* |
| * Initialze mbedtls_ssl_config |
| */ |
| void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) |
| { |
| memset( conf, 0, sizeof( mbedtls_ssl_config ) ); |
| } |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| static int ssl_preset_default_hashes[] = { |
| #if defined(MBEDTLS_SHA512_C) |
| MBEDTLS_MD_SHA512, |
| MBEDTLS_MD_SHA384, |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| MBEDTLS_MD_SHA256, |
| MBEDTLS_MD_SHA224, |
| #endif |
| #if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE) |
| MBEDTLS_MD_SHA1, |
| #endif |
| MBEDTLS_MD_NONE |
| }; |
| #endif |
| |
| static int ssl_preset_suiteb_ciphersuites[] = { |
| MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, |
| MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, |
| 0 |
| }; |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| static int ssl_preset_suiteb_hashes[] = { |
| MBEDTLS_MD_SHA256, |
| MBEDTLS_MD_SHA384, |
| MBEDTLS_MD_NONE |
| }; |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { |
| #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) |
| MBEDTLS_ECP_DP_SECP256R1, |
| #endif |
| #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) |
| MBEDTLS_ECP_DP_SECP384R1, |
| #endif |
| MBEDTLS_ECP_DP_NONE |
| }; |
| #endif |
| |
| /* |
| * Load default in mbedtls_ssl_config |
| */ |
| int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf, |
| int endpoint, int transport, int preset ) |
| { |
| #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) |
| int ret; |
| #endif |
| |
| /* Use the functions here so that they are covered in tests, |
| * but otherwise access member directly for efficiency */ |
| mbedtls_ssl_conf_endpoint( conf, endpoint ); |
| mbedtls_ssl_conf_transport( conf, transport ); |
| |
| /* |
| * Things that are common to all presets |
| */ |
| #if defined(MBEDTLS_SSL_CLI_C) |
| if( endpoint == MBEDTLS_SSL_IS_CLIENT ) |
| { |
| conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; |
| #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; |
| #endif |
| } |
| #endif |
| |
| #if defined(MBEDTLS_ARC4_C) |
| conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) |
| conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) |
| conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) |
| conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) |
| conf->f_cookie_write = ssl_cookie_write_dummy; |
| conf->f_cookie_check = ssl_cookie_check_dummy; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) |
| conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SRV_C) |
| conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; |
| conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; |
| memset( conf->renego_period, 0x00, 2 ); |
| memset( conf->renego_period + 2, 0xFF, 6 ); |
| #endif |
| |
| #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) |
| if( endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| const unsigned char dhm_p[] = |
| MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; |
| const unsigned char dhm_g[] = |
| MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; |
| |
| if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf, |
| dhm_p, sizeof( dhm_p ), |
| dhm_g, sizeof( dhm_g ) ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| } |
| #endif |
| |
| /* |
| * Preset-specific defaults |
| */ |
| switch( preset ) |
| { |
| /* |
| * NSA Suite B |
| */ |
| case MBEDTLS_SSL_PRESET_SUITEB: |
| conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; |
| conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ |
| conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; |
| conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; |
| |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = |
| ssl_preset_suiteb_ciphersuites; |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; |
| #endif |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| conf->sig_hashes = ssl_preset_suiteb_hashes; |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| conf->curve_list = ssl_preset_suiteb_curves; |
| #endif |
| break; |
| |
| /* |
| * Default |
| */ |
| default: |
| conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION > |
| MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ? |
| MBEDTLS_SSL_MIN_MAJOR_VERSION : |
| MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION; |
| conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION > |
| MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ? |
| MBEDTLS_SSL_MIN_MINOR_VERSION : |
| MBEDTLS_SSL_MIN_VALID_MINOR_VERSION; |
| conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; |
| conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; |
| |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2; |
| #endif |
| |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = |
| conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = |
| mbedtls_ssl_list_ciphersuites(); |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| conf->cert_profile = &mbedtls_x509_crt_profile_default; |
| #endif |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| conf->sig_hashes = ssl_preset_default_hashes; |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| conf->curve_list = mbedtls_ecp_grp_id_list(); |
| #endif |
| |
| #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) |
| conf->dhm_min_bitlen = 1024; |
| #endif |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Free mbedtls_ssl_config |
| */ |
| void mbedtls_ssl_config_free( mbedtls_ssl_config *conf ) |
| { |
| #if defined(MBEDTLS_DHM_C) |
| mbedtls_mpi_free( &conf->dhm_P ); |
| mbedtls_mpi_free( &conf->dhm_G ); |
| #endif |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) |
| if( conf->psk != NULL ) |
| { |
| mbedtls_platform_zeroize( conf->psk, conf->psk_len ); |
| mbedtls_free( conf->psk ); |
| conf->psk = NULL; |
| conf->psk_len = 0; |
| } |
| |
| if( conf->psk_identity != NULL ) |
| { |
| mbedtls_platform_zeroize( conf->psk_identity, conf->psk_identity_len ); |
| mbedtls_free( conf->psk_identity ); |
| conf->psk_identity = NULL; |
| conf->psk_identity_len = 0; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| ssl_key_cert_free( conf->key_cert ); |
| #endif |
| |
| mbedtls_platform_zeroize( conf, sizeof( mbedtls_ssl_config ) ); |
| } |
| |
| #if defined(MBEDTLS_PK_C) && \ |
| ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) ) |
| /* |
| * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX |
| */ |
| unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk ) |
| { |
| #if defined(MBEDTLS_RSA_C) |
| if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) ) |
| return( MBEDTLS_SSL_SIG_RSA ); |
| #endif |
| #if defined(MBEDTLS_ECDSA_C) |
| if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) ) |
| return( MBEDTLS_SSL_SIG_ECDSA ); |
| #endif |
| return( MBEDTLS_SSL_SIG_ANON ); |
| } |
| |
| unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type ) |
| { |
| switch( type ) { |
| case MBEDTLS_PK_RSA: |
| return( MBEDTLS_SSL_SIG_RSA ); |
| case MBEDTLS_PK_ECDSA: |
| case MBEDTLS_PK_ECKEY: |
| return( MBEDTLS_SSL_SIG_ECDSA ); |
| default: |
| return( MBEDTLS_SSL_SIG_ANON ); |
| } |
| } |
| |
| mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig ) |
| { |
| switch( sig ) |
| { |
| #if defined(MBEDTLS_RSA_C) |
| case MBEDTLS_SSL_SIG_RSA: |
| return( MBEDTLS_PK_RSA ); |
| #endif |
| #if defined(MBEDTLS_ECDSA_C) |
| case MBEDTLS_SSL_SIG_ECDSA: |
| return( MBEDTLS_PK_ECDSA ); |
| #endif |
| default: |
| return( MBEDTLS_PK_NONE ); |
| } |
| } |
| #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ |
| defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| |
| /* Find an entry in a signature-hash set matching a given hash algorithm. */ |
| mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set, |
| mbedtls_pk_type_t sig_alg ) |
| { |
| switch( sig_alg ) |
| { |
| case MBEDTLS_PK_RSA: |
| return( set->rsa ); |
| case MBEDTLS_PK_ECDSA: |
| return( set->ecdsa ); |
| default: |
| return( MBEDTLS_MD_NONE ); |
| } |
| } |
| |
| /* Add a signature-hash-pair to a signature-hash set */ |
| void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set, |
| mbedtls_pk_type_t sig_alg, |
| mbedtls_md_type_t md_alg ) |
| { |
| switch( sig_alg ) |
| { |
| case MBEDTLS_PK_RSA: |
| if( set->rsa == MBEDTLS_MD_NONE ) |
| set->rsa = md_alg; |
| break; |
| |
| case MBEDTLS_PK_ECDSA: |
| if( set->ecdsa == MBEDTLS_MD_NONE ) |
| set->ecdsa = md_alg; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| /* Allow exactly one hash algorithm for each signature. */ |
| void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set, |
| mbedtls_md_type_t md_alg ) |
| { |
| set->rsa = md_alg; |
| set->ecdsa = md_alg; |
| } |
| |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2) && |
| MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ |
| |
| /* |
| * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX |
| */ |
| mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash ) |
| { |
| switch( hash ) |
| { |
| #if defined(MBEDTLS_MD5_C) |
| case MBEDTLS_SSL_HASH_MD5: |
| return( MBEDTLS_MD_MD5 ); |
| #endif |
| #if defined(MBEDTLS_SHA1_C) |
| case MBEDTLS_SSL_HASH_SHA1: |
| return( MBEDTLS_MD_SHA1 ); |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| case MBEDTLS_SSL_HASH_SHA224: |
| return( MBEDTLS_MD_SHA224 ); |
| case MBEDTLS_SSL_HASH_SHA256: |
| return( MBEDTLS_MD_SHA256 ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| case MBEDTLS_SSL_HASH_SHA384: |
| return( MBEDTLS_MD_SHA384 ); |
| case MBEDTLS_SSL_HASH_SHA512: |
| return( MBEDTLS_MD_SHA512 ); |
| #endif |
| default: |
| return( MBEDTLS_MD_NONE ); |
| } |
| } |
| |
| /* |
| * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX |
| */ |
| unsigned char mbedtls_ssl_hash_from_md_alg( int md ) |
| { |
| switch( md ) |
| { |
| #if defined(MBEDTLS_MD5_C) |
| case MBEDTLS_MD_MD5: |
| return( MBEDTLS_SSL_HASH_MD5 ); |
| #endif |
| #if defined(MBEDTLS_SHA1_C) |
| case MBEDTLS_MD_SHA1: |
| return( MBEDTLS_SSL_HASH_SHA1 ); |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| case MBEDTLS_MD_SHA224: |
| return( MBEDTLS_SSL_HASH_SHA224 ); |
| case MBEDTLS_MD_SHA256: |
| return( MBEDTLS_SSL_HASH_SHA256 ); |
| #endif |
| #if defined(MBEDTLS_SHA512_C) |
| case MBEDTLS_MD_SHA384: |
| return( MBEDTLS_SSL_HASH_SHA384 ); |
| case MBEDTLS_MD_SHA512: |
| return( MBEDTLS_SSL_HASH_SHA512 ); |
| #endif |
| default: |
| return( MBEDTLS_SSL_HASH_NONE ); |
| } |
| } |
| |
| #if defined(MBEDTLS_ECP_C) |
| /* |
| * Check if a curve proposed by the peer is in our list. |
| * Return 0 if we're willing to use it, -1 otherwise. |
| */ |
| int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) |
| { |
| const mbedtls_ecp_group_id *gid; |
| |
| if( ssl->conf->curve_list == NULL ) |
| return( -1 ); |
| |
| for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) |
| if( *gid == grp_id ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) |
| /* |
| * Check if a hash proposed by the peer is in our list. |
| * Return 0 if we're willing to use it, -1 otherwise. |
| */ |
| int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl, |
| mbedtls_md_type_t md ) |
| { |
| const int *cur; |
| |
| if( ssl->conf->sig_hashes == NULL ) |
| return( -1 ); |
| |
| for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) |
| if( *cur == (int) md ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert, |
| const mbedtls_ssl_ciphersuite_t *ciphersuite, |
| int cert_endpoint, |
| uint32_t *flags ) |
| { |
| int ret = 0; |
| #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) |
| int usage = 0; |
| #endif |
| #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) |
| const char *ext_oid; |
| size_t ext_len; |
| #endif |
| |
| #if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \ |
| !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) |
| ((void) cert); |
| ((void) cert_endpoint); |
| ((void) flags); |
| #endif |
| |
| #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) |
| if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| /* Server part of the key exchange */ |
| switch( ciphersuite->key_exchange ) |
| { |
| case MBEDTLS_KEY_EXCHANGE_RSA: |
| case MBEDTLS_KEY_EXCHANGE_RSA_PSK: |
| usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; |
| break; |
| |
| case MBEDTLS_KEY_EXCHANGE_DHE_RSA: |
| case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: |
| case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: |
| usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; |
| break; |
| |
| case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: |
| case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: |
| usage = MBEDTLS_X509_KU_KEY_AGREEMENT; |
| break; |
| |
| /* Don't use default: we want warnings when adding new values */ |
| case MBEDTLS_KEY_EXCHANGE_NONE: |
| case MBEDTLS_KEY_EXCHANGE_PSK: |
| case MBEDTLS_KEY_EXCHANGE_DHE_PSK: |
| case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: |
| case MBEDTLS_KEY_EXCHANGE_ECJPAKE: |
| usage = 0; |
| } |
| } |
| else |
| { |
| /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ |
| usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; |
| } |
| |
| if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 ) |
| { |
| *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; |
| ret = -1; |
| } |
| #else |
| ((void) ciphersuite); |
| #endif /* MBEDTLS_X509_CHECK_KEY_USAGE */ |
| |
| #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) |
| if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) |
| { |
| ext_oid = MBEDTLS_OID_SERVER_AUTH; |
| ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ); |
| } |
| else |
| { |
| ext_oid = MBEDTLS_OID_CLIENT_AUTH; |
| ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH ); |
| } |
| |
| if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 ) |
| { |
| *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; |
| ret = -1; |
| } |
| #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |
| |
| /* |
| * Convert version numbers to/from wire format |
| * and, for DTLS, to/from TLS equivalent. |
| * |
| * For TLS this is the identity. |
| * For DTLS, use 1's complement (v -> 255 - v, and then map as follows: |
| * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1) |
| * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2) |
| */ |
| void mbedtls_ssl_write_version( int major, int minor, int transport, |
| unsigned char ver[2] ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| if( minor == MBEDTLS_SSL_MINOR_VERSION_2 ) |
| --minor; /* DTLS 1.0 stored as TLS 1.1 internally */ |
| |
| ver[0] = (unsigned char)( 255 - ( major - 2 ) ); |
| ver[1] = (unsigned char)( 255 - ( minor - 1 ) ); |
| } |
| else |
| #else |
| ((void) transport); |
| #endif |
| { |
| ver[0] = (unsigned char) major; |
| ver[1] = (unsigned char) minor; |
| } |
| } |
| |
| void mbedtls_ssl_read_version( int *major, int *minor, int transport, |
| const unsigned char ver[2] ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_DTLS) |
| if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) |
| { |
| *major = 255 - ver[0] + 2; |
| *minor = 255 - ver[1] + 1; |
| |
| if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 ) |
| ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */ |
| } |
| else |
| #else |
| ((void) transport); |
| #endif |
| { |
| *major = ver[0]; |
| *minor = ver[1]; |
| } |
| } |
| |
| int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) |
| return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; |
| |
| switch( md ) |
| { |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| #if defined(MBEDTLS_MD5_C) |
| case MBEDTLS_SSL_HASH_MD5: |
| return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; |
| #endif |
| #if defined(MBEDTLS_SHA1_C) |
| case MBEDTLS_SSL_HASH_SHA1: |
| ssl->handshake->calc_verify = ssl_calc_verify_tls; |
| break; |
| #endif |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ |
| #if defined(MBEDTLS_SHA512_C) |
| case MBEDTLS_SSL_HASH_SHA384: |
| ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; |
| break; |
| #endif |
| #if defined(MBEDTLS_SHA256_C) |
| case MBEDTLS_SSL_HASH_SHA256: |
| ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; |
| break; |
| #endif |
| default: |
| return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; |
| } |
| |
| return 0; |
| #else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ |
| (void) ssl; |
| (void) md; |
| |
| return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; |
| #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ |
| } |
| |
| #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_1) |
| int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl, |
| unsigned char *output, |
| unsigned char *data, size_t data_len ) |
| { |
| int ret = 0; |
| mbedtls_md5_context mbedtls_md5; |
| mbedtls_sha1_context mbedtls_sha1; |
| |
| mbedtls_md5_init( &mbedtls_md5 ); |
| mbedtls_sha1_init( &mbedtls_sha1 ); |
| |
| /* |
| * digitally-signed struct { |
| * opaque md5_hash[16]; |
| * opaque sha_hash[20]; |
| * }; |
| * |
| * md5_hash |
| * MD5(ClientHello.random + ServerHello.random |
| * + ServerParams); |
| * sha_hash |
| * SHA(ClientHello.random + ServerHello.random |
| * + ServerParams); |
| */ |
| if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, |
| ssl->handshake->randbytes, 64 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret ); |
| goto exit; |
| } |
| |
| if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, |
| ssl->handshake->randbytes, 64 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data, |
| data_len ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1, |
| output + 16 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret ); |
| goto exit; |
| } |
| |
| exit: |
| mbedtls_md5_free( &mbedtls_md5 ); |
| mbedtls_sha1_free( &mbedtls_sha1 ); |
| |
| if( ret != 0 ) |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); |
| |
| return( ret ); |
| |
| } |
| #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ |
| MBEDTLS_SSL_PROTO_TLS1_1 */ |
| |
| #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ |
| defined(MBEDTLS_SSL_PROTO_TLS1_2) |
| int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, |
| unsigned char *hash, size_t *hashlen, |
| unsigned char *data, size_t data_len, |
| mbedtls_md_type_t md_alg ) |
| { |
| int ret = 0; |
| mbedtls_md_context_t ctx; |
| const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); |
| *hashlen = mbedtls_md_get_size( md_info ); |
| |
| mbedtls_md_init( &ctx ); |
| |
| /* |
| * digitally-signed struct { |
| * opaque client_random[32]; |
| * opaque server_random[32]; |
| * ServerDHParams params; |
| * }; |
| */ |
| if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); |
| goto exit; |
| } |
| if( ( ret = mbedtls_md_finish( &ctx, hash ) ) != 0 ) |
| { |
| MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret ); |
| goto exit; |
| } |
| |
| exit: |
| mbedtls_md_free( &ctx ); |
| |
| if( ret != 0 ) |
| mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, |
| MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ |
| MBEDTLS_SSL_PROTO_TLS1_2 */ |
| |
| #endif /* MBEDTLS_SSL_TLS_C */ |