| /* |
| * X.509 certificate parsing and verification |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| * |
| * This file is provided under the Apache License 2.0, or the |
| * GNU General Public License v2.0 or later. |
| * |
| * ********** |
| * Apache License 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. |
| * |
| * ********** |
| * |
| * ********** |
| * GNU General Public License v2.0 or later: |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * ********** |
| */ |
| /* |
| * The ITU-T X.509 standard defines a certificate format for PKI. |
| * |
| * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs) |
| * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs) |
| * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10) |
| * |
| * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf |
| * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| |
| #include "mbedtls/x509_crt.h" |
| #include "mbedtls/oid.h" |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| #include "mbedtls/pem.h" |
| #endif |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdio.h> |
| #include <stdlib.h> |
| #define mbedtls_free free |
| #define mbedtls_calloc calloc |
| #define mbedtls_snprintf snprintf |
| #endif |
| |
| #if defined(MBEDTLS_THREADING_C) |
| #include "mbedtls/threading.h" |
| #endif |
| |
| #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) |
| #include <windows.h> |
| #else |
| #include <time.h> |
| #endif |
| |
| #if defined(MBEDTLS_FS_IO) |
| #include <stdio.h> |
| #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32) |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <dirent.h> |
| #endif /* !_WIN32 || EFIX64 || EFI32 */ |
| #endif |
| |
| /* Implementation that should never be optimized out by the compiler */ |
| static void mbedtls_zeroize( void *v, size_t n ) { |
| volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| } |
| |
| /* |
| * Default profile |
| */ |
| const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default = |
| { |
| #if defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES) |
| /* Allow SHA-1 (weak, but still safe in controlled environments) */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) | |
| #endif |
| /* Only SHA-2 hashes */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), |
| 0xFFFFFFF, /* Any PK alg */ |
| 0xFFFFFFF, /* Any curve */ |
| 2048, |
| }; |
| |
| /* |
| * Next-default profile |
| */ |
| const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next = |
| { |
| /* Hashes from SHA-256 and above */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), |
| 0xFFFFFFF, /* Any PK alg */ |
| #if defined(MBEDTLS_ECP_C) |
| /* Curves at or above 128-bit security level */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ), |
| #else |
| 0, |
| #endif |
| 2048, |
| }; |
| |
| /* |
| * NSA Suite B Profile |
| */ |
| const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb = |
| { |
| /* Only SHA-256 and 384 */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ), |
| /* Only ECDSA */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ), |
| #if defined(MBEDTLS_ECP_C) |
| /* Only NIST P-256 and P-384 */ |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | |
| MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ), |
| #else |
| 0, |
| #endif |
| 0, |
| }; |
| |
| /* |
| * Check md_alg against profile |
| * Return 0 if md_alg acceptable for this profile, -1 otherwise |
| */ |
| static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile, |
| mbedtls_md_type_t md_alg ) |
| { |
| if( md_alg == MBEDTLS_MD_NONE ) |
| return( -1 ); |
| |
| if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Check pk_alg against profile |
| * Return 0 if pk_alg acceptable for this profile, -1 otherwise |
| */ |
| static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile, |
| mbedtls_pk_type_t pk_alg ) |
| { |
| if( pk_alg == MBEDTLS_PK_NONE ) |
| return( -1 ); |
| |
| if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Check key against profile |
| * Return 0 if pk_alg acceptable for this profile, -1 otherwise |
| */ |
| static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile, |
| mbedtls_pk_type_t pk_alg, |
| const mbedtls_pk_context *pk ) |
| { |
| #if defined(MBEDTLS_RSA_C) |
| if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS ) |
| { |
| if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| if( pk_alg == MBEDTLS_PK_ECDSA || |
| pk_alg == MBEDTLS_PK_ECKEY || |
| pk_alg == MBEDTLS_PK_ECKEY_DH ) |
| { |
| mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id; |
| |
| if( gid == MBEDTLS_ECP_DP_NONE ) |
| return( -1 ); |
| |
| if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 ) |
| return( 0 ); |
| |
| return( -1 ); |
| } |
| #endif |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| */ |
| static int x509_get_version( unsigned char **p, |
| const unsigned char *end, |
| int *ver ) |
| { |
| int ret; |
| size_t len; |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 ) |
| { |
| if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| { |
| *ver = 0; |
| return( 0 ); |
| } |
| |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| end = *p + len; |
| |
| if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_VERSION + ret ); |
| |
| if( *p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_VERSION + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Validity ::= SEQUENCE { |
| * notBefore Time, |
| * notAfter Time } |
| */ |
| static int x509_get_dates( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_time *from, |
| mbedtls_x509_time *to ) |
| { |
| int ret; |
| size_t len; |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_DATE + ret ); |
| |
| end = *p + len; |
| |
| if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 ) |
| return( ret ); |
| |
| if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 ) |
| return( ret ); |
| |
| if( *p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_DATE + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * X.509 v2/v3 unique identifier (not parsed) |
| */ |
| static int x509_get_uid( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_buf *uid, int n ) |
| { |
| int ret; |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| uid->tag = **p; |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 ) |
| { |
| if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( 0 ); |
| |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| uid->p = *p; |
| *p += uid->len; |
| |
| return( 0 ); |
| } |
| |
| static int x509_get_basic_constraints( unsigned char **p, |
| const unsigned char *end, |
| int *ca_istrue, |
| int *max_pathlen ) |
| { |
| int ret; |
| size_t len; |
| |
| /* |
| * BasicConstraints ::= SEQUENCE { |
| * cA BOOLEAN DEFAULT FALSE, |
| * pathLenConstraint INTEGER (0..MAX) OPTIONAL } |
| */ |
| *ca_istrue = 0; /* DEFAULT FALSE */ |
| *max_pathlen = 0; /* endless */ |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 ) |
| { |
| if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| ret = mbedtls_asn1_get_int( p, end, ca_istrue ); |
| |
| if( ret != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *ca_istrue != 0 ) |
| *ca_istrue = 1; |
| } |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| /* Do not accept max_pathlen equal to INT_MAX to avoid a signed integer |
| * overflow, which is an undefined behavior. */ |
| if( *max_pathlen == INT_MAX ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_INVALID_LENGTH ); |
| |
| (*max_pathlen)++; |
| |
| return( 0 ); |
| } |
| |
| static int x509_get_ns_cert_type( unsigned char **p, |
| const unsigned char *end, |
| unsigned char *ns_cert_type) |
| { |
| int ret; |
| mbedtls_x509_bitstring bs = { 0, 0, NULL }; |
| |
| if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( bs.len != 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_INVALID_LENGTH ); |
| |
| /* Get actual bitstring */ |
| *ns_cert_type = *bs.p; |
| return( 0 ); |
| } |
| |
| static int x509_get_key_usage( unsigned char **p, |
| const unsigned char *end, |
| unsigned int *key_usage) |
| { |
| int ret; |
| size_t i; |
| mbedtls_x509_bitstring bs = { 0, 0, NULL }; |
| |
| if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( bs.len < 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_INVALID_LENGTH ); |
| |
| /* Get actual bitstring */ |
| *key_usage = 0; |
| for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ ) |
| { |
| *key_usage |= (unsigned int) bs.p[i] << (8*i); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId |
| * |
| * KeyPurposeId ::= OBJECT IDENTIFIER |
| */ |
| static int x509_get_ext_key_usage( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_sequence *ext_key_usage) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| /* Sequence length must be >= 1 */ |
| if( ext_key_usage->buf.p == NULL ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_INVALID_LENGTH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * SubjectAltName ::= GeneralNames |
| * |
| * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName |
| * |
| * GeneralName ::= CHOICE { |
| * otherName [0] OtherName, |
| * rfc822Name [1] IA5String, |
| * dNSName [2] IA5String, |
| * x400Address [3] ORAddress, |
| * directoryName [4] Name, |
| * ediPartyName [5] EDIPartyName, |
| * uniformResourceIdentifier [6] IA5String, |
| * iPAddress [7] OCTET STRING, |
| * registeredID [8] OBJECT IDENTIFIER } |
| * |
| * OtherName ::= SEQUENCE { |
| * type-id OBJECT IDENTIFIER, |
| * value [0] EXPLICIT ANY DEFINED BY type-id } |
| * |
| * EDIPartyName ::= SEQUENCE { |
| * nameAssigner [0] DirectoryString OPTIONAL, |
| * partyName [1] DirectoryString } |
| * |
| * NOTE: we only parse and use dNSName at this point. |
| */ |
| static int x509_get_subject_alt_name( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_sequence *subject_alt_name ) |
| { |
| int ret; |
| size_t len, tag_len; |
| mbedtls_asn1_buf *buf; |
| unsigned char tag; |
| mbedtls_asn1_sequence *cur = subject_alt_name; |
| |
| /* Get main sequence tag */ |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p + len != end ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| while( *p < end ) |
| { |
| if( ( end - *p ) < 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA ); |
| |
| tag = **p; |
| (*p)++; |
| if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) != |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC ) |
| { |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| } |
| |
| /* Skip everything but DNS name */ |
| if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) ) |
| { |
| *p += tag_len; |
| continue; |
| } |
| |
| /* Allocate and assign next pointer */ |
| if( cur->buf.p != NULL ) |
| { |
| if( cur->next != NULL ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); |
| |
| cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) ); |
| |
| if( cur->next == NULL ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_ALLOC_FAILED ); |
| |
| cur = cur->next; |
| } |
| |
| buf = &(cur->buf); |
| buf->tag = tag; |
| buf->p = *p; |
| buf->len = tag_len; |
| *p += buf->len; |
| } |
| |
| /* Set final sequence entry's next pointer to NULL */ |
| cur->next = NULL; |
| |
| if( *p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * X.509 v3 extensions |
| * |
| */ |
| static int x509_get_crt_ext( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_crt *crt ) |
| { |
| int ret; |
| size_t len; |
| unsigned char *end_ext_data, *end_ext_octet; |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 ) |
| return( ret ); |
| |
| end = crt->v3_ext.p + crt->v3_ext.len; |
| while( *p < end ) |
| { |
| /* |
| * Extension ::= SEQUENCE { |
| * extnID OBJECT IDENTIFIER, |
| * critical BOOLEAN DEFAULT FALSE, |
| * extnValue OCTET STRING } |
| */ |
| mbedtls_x509_buf extn_oid = {0, 0, NULL}; |
| int is_critical = 0; /* DEFAULT FALSE */ |
| int ext_type = 0; |
| |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| end_ext_data = *p + len; |
| |
| /* Get extension ID */ |
| if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len, |
| MBEDTLS_ASN1_OID ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| extn_oid.tag = MBEDTLS_ASN1_OID; |
| extn_oid.p = *p; |
| *p += extn_oid.len; |
| |
| /* Get optional critical */ |
| if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 && |
| ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| /* Data should be octet string type */ |
| if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, |
| MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| end_ext_octet = *p + len; |
| |
| if( end_ext_octet != end_ext_data ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| /* |
| * Detect supported extensions |
| */ |
| ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type ); |
| |
| if( ret != 0 ) |
| { |
| /* No parser found, skip extension */ |
| *p = end_ext_octet; |
| |
| #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) |
| if( is_critical ) |
| { |
| /* Data is marked as critical: fail */ |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| } |
| #endif |
| continue; |
| } |
| |
| /* Forbid repeated extensions */ |
| if( ( crt->ext_types & ext_type ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); |
| |
| crt->ext_types |= ext_type; |
| |
| switch( ext_type ) |
| { |
| case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS: |
| /* Parse basic constraints */ |
| if( ( ret = x509_get_basic_constraints( p, end_ext_octet, |
| &crt->ca_istrue, &crt->max_pathlen ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case MBEDTLS_X509_EXT_KEY_USAGE: |
| /* Parse key usage */ |
| if( ( ret = x509_get_key_usage( p, end_ext_octet, |
| &crt->key_usage ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE: |
| /* Parse extended key usage */ |
| if( ( ret = x509_get_ext_key_usage( p, end_ext_octet, |
| &crt->ext_key_usage ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME: |
| /* Parse subject alt name */ |
| if( ( ret = x509_get_subject_alt_name( p, end_ext_octet, |
| &crt->subject_alt_names ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case MBEDTLS_X509_EXT_NS_CERT_TYPE: |
| /* Parse netscape certificate type */ |
| if( ( ret = x509_get_ns_cert_type( p, end_ext_octet, |
| &crt->ns_cert_type ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| default: |
| return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); |
| } |
| } |
| |
| if( *p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse and fill a single X.509 certificate in DER format |
| */ |
| static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *buf, |
| size_t buflen ) |
| { |
| int ret; |
| size_t len; |
| unsigned char *p, *end, *crt_end; |
| mbedtls_x509_buf sig_params1, sig_params2, sig_oid2; |
| |
| memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) ); |
| memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) ); |
| memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) ); |
| |
| /* |
| * Check for valid input |
| */ |
| if( crt == NULL || buf == NULL ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| // Use the original buffer until we figure out actual length |
| p = (unsigned char*) buf; |
| len = buflen; |
| end = p + len; |
| |
| /* |
| * Certificate ::= SEQUENCE { |
| * tbsCertificate TBSCertificate, |
| * signatureAlgorithm AlgorithmIdentifier, |
| * signatureValue BIT STRING } |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT ); |
| } |
| |
| if( len > (size_t) ( end - p ) ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| crt_end = p + len; |
| |
| // Create and populate a new buffer for the raw field |
| crt->raw.len = crt_end - buf; |
| crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len ); |
| if( p == NULL ) |
| return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| |
| memcpy( p, buf, crt->raw.len ); |
| |
| // Direct pointers to the new buffer |
| p += crt->raw.len - len; |
| end = crt_end = p + len; |
| |
| /* |
| * TBSCertificate ::= SEQUENCE { |
| */ |
| crt->tbs.p = p; |
| |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| end = p + len; |
| crt->tbs.len = end - crt->tbs.p; |
| |
| /* |
| * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| * |
| * CertificateSerialNumber ::= INTEGER |
| * |
| * signature AlgorithmIdentifier |
| */ |
| if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 || |
| ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 || |
| ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid, |
| &sig_params1 ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| if( crt->version < 0 || crt->version > 2 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); |
| } |
| |
| crt->version++; |
| |
| if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1, |
| &crt->sig_md, &crt->sig_pk, |
| &crt->sig_opts ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * issuer Name |
| */ |
| crt->issuer_raw.p = p; |
| |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| crt->issuer_raw.len = p - crt->issuer_raw.p; |
| |
| /* |
| * Validity ::= SEQUENCE { |
| * notBefore Time, |
| * notAfter Time } |
| * |
| */ |
| if( ( ret = x509_get_dates( &p, end, &crt->valid_from, |
| &crt->valid_to ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * subject Name |
| */ |
| crt->subject_raw.p = p; |
| |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| crt->subject_raw.len = p - crt->subject_raw.p; |
| |
| /* |
| * SubjectPublicKeyInfo |
| */ |
| if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL, |
| * -- If present, version shall be v2 or v3 |
| * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL, |
| * -- If present, version shall be v2 or v3 |
| * extensions [3] EXPLICIT Extensions OPTIONAL |
| * -- If present, version shall be v3 |
| */ |
| if( crt->version == 2 || crt->version == 3 ) |
| { |
| ret = x509_get_uid( &p, end, &crt->issuer_id, 1 ); |
| if( ret != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| } |
| |
| if( crt->version == 2 || crt->version == 3 ) |
| { |
| ret = x509_get_uid( &p, end, &crt->subject_id, 2 ); |
| if( ret != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| } |
| |
| #if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3) |
| if( crt->version == 3 ) |
| #endif |
| { |
| ret = x509_get_crt_ext( &p, end, crt ); |
| if( ret != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| } |
| |
| if( p != end ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| |
| end = crt_end; |
| |
| /* |
| * } |
| * -- end of TBSCertificate |
| * |
| * signatureAlgorithm AlgorithmIdentifier, |
| * signatureValue BIT STRING |
| */ |
| if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| if( crt->sig_oid.len != sig_oid2.len || |
| memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 || |
| sig_params1.len != sig_params2.len || |
| ( sig_params1.len != 0 && |
| memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_SIG_MISMATCH ); |
| } |
| |
| if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| if( p != end ) |
| { |
| mbedtls_x509_crt_free( crt ); |
| return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse one X.509 certificate in DER format from a buffer and add them to a |
| * chained list |
| */ |
| int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf, |
| size_t buflen ) |
| { |
| int ret; |
| mbedtls_x509_crt *crt = chain, *prev = NULL; |
| |
| /* |
| * Check for valid input |
| */ |
| if( crt == NULL || buf == NULL ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| while( crt->version != 0 && crt->next != NULL ) |
| { |
| prev = crt; |
| crt = crt->next; |
| } |
| |
| /* |
| * Add new certificate on the end of the chain if needed. |
| */ |
| if( crt->version != 0 && crt->next == NULL ) |
| { |
| crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); |
| |
| if( crt->next == NULL ) |
| return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| |
| prev = crt; |
| mbedtls_x509_crt_init( crt->next ); |
| crt = crt->next; |
| } |
| |
| if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 ) |
| { |
| if( prev ) |
| prev->next = NULL; |
| |
| if( crt != chain ) |
| mbedtls_free( crt ); |
| |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse one or more PEM certificates from a buffer and add them to the chained |
| * list |
| */ |
| int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen ) |
| { |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| int success = 0, first_error = 0, total_failed = 0; |
| int buf_format = MBEDTLS_X509_FORMAT_DER; |
| #endif |
| |
| /* |
| * Check for valid input |
| */ |
| if( chain == NULL || buf == NULL ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| /* |
| * Determine buffer content. Buffer contains either one DER certificate or |
| * one or more PEM certificates. |
| */ |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| if( buflen != 0 && buf[buflen - 1] == '\0' && |
| strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL ) |
| { |
| buf_format = MBEDTLS_X509_FORMAT_PEM; |
| } |
| |
| if( buf_format == MBEDTLS_X509_FORMAT_DER ) |
| return mbedtls_x509_crt_parse_der( chain, buf, buflen ); |
| #else |
| return mbedtls_x509_crt_parse_der( chain, buf, buflen ); |
| #endif |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| if( buf_format == MBEDTLS_X509_FORMAT_PEM ) |
| { |
| int ret; |
| mbedtls_pem_context pem; |
| |
| /* 1 rather than 0 since the terminating NULL byte is counted in */ |
| while( buflen > 1 ) |
| { |
| size_t use_len; |
| mbedtls_pem_init( &pem ); |
| |
| /* If we get there, we know the string is null-terminated */ |
| ret = mbedtls_pem_read_buffer( &pem, |
| "-----BEGIN CERTIFICATE-----", |
| "-----END CERTIFICATE-----", |
| buf, NULL, 0, &use_len ); |
| |
| if( ret == 0 ) |
| { |
| /* |
| * Was PEM encoded |
| */ |
| buflen -= use_len; |
| buf += use_len; |
| } |
| else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA ) |
| { |
| return( ret ); |
| } |
| else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) |
| { |
| mbedtls_pem_free( &pem ); |
| |
| /* |
| * PEM header and footer were found |
| */ |
| buflen -= use_len; |
| buf += use_len; |
| |
| if( first_error == 0 ) |
| first_error = ret; |
| |
| total_failed++; |
| continue; |
| } |
| else |
| break; |
| |
| ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen ); |
| |
| mbedtls_pem_free( &pem ); |
| |
| if( ret != 0 ) |
| { |
| /* |
| * Quit parsing on a memory error |
| */ |
| if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED ) |
| return( ret ); |
| |
| if( first_error == 0 ) |
| first_error = ret; |
| |
| total_failed++; |
| continue; |
| } |
| |
| success = 1; |
| } |
| } |
| |
| if( success ) |
| return( total_failed ); |
| else if( first_error ) |
| return( first_error ); |
| else |
| return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT ); |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| } |
| |
| #if defined(MBEDTLS_FS_IO) |
| /* |
| * Load one or more certificates and add them to the chained list |
| */ |
| int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path ) |
| { |
| int ret; |
| size_t n; |
| unsigned char *buf; |
| |
| if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) |
| return( ret ); |
| |
| ret = mbedtls_x509_crt_parse( chain, buf, n ); |
| |
| mbedtls_zeroize( buf, n ); |
| mbedtls_free( buf ); |
| |
| return( ret ); |
| } |
| |
| int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path ) |
| { |
| int ret = 0; |
| #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) |
| int w_ret; |
| WCHAR szDir[MAX_PATH]; |
| char filename[MAX_PATH]; |
| char *p; |
| size_t len = strlen( path ); |
| |
| WIN32_FIND_DATAW file_data; |
| HANDLE hFind; |
| |
| if( len > MAX_PATH - 3 ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| memset( szDir, 0, sizeof(szDir) ); |
| memset( filename, 0, MAX_PATH ); |
| memcpy( filename, path, len ); |
| filename[len++] = '\\'; |
| p = filename + len; |
| filename[len++] = '*'; |
| |
| w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir, |
| MAX_PATH - 3 ); |
| if( w_ret == 0 ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| hFind = FindFirstFileW( szDir, &file_data ); |
| if( hFind == INVALID_HANDLE_VALUE ) |
| return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); |
| |
| len = MAX_PATH - len; |
| do |
| { |
| memset( p, 0, len ); |
| |
| if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) |
| continue; |
| |
| w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName, |
| lstrlenW( file_data.cFileName ), |
| p, (int) len - 1, |
| NULL, NULL ); |
| if( w_ret == 0 ) |
| { |
| ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; |
| goto cleanup; |
| } |
| |
| w_ret = mbedtls_x509_crt_parse_file( chain, filename ); |
| if( w_ret < 0 ) |
| ret++; |
| else |
| ret += w_ret; |
| } |
| while( FindNextFileW( hFind, &file_data ) != 0 ); |
| |
| if( GetLastError() != ERROR_NO_MORE_FILES ) |
| ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; |
| |
| cleanup: |
| FindClose( hFind ); |
| #else /* _WIN32 */ |
| int t_ret; |
| int snp_ret; |
| struct stat sb; |
| struct dirent *entry; |
| char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN]; |
| DIR *dir = opendir( path ); |
| |
| if( dir == NULL ) |
| return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); |
| |
| #if defined(MBEDTLS_THREADING_C) |
| if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 ) |
| { |
| closedir( dir ); |
| return( ret ); |
| } |
| #endif /* MBEDTLS_THREADING_C */ |
| |
| while( ( entry = readdir( dir ) ) != NULL ) |
| { |
| snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name, |
| "%s/%s", path, entry->d_name ); |
| |
| if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name ) |
| { |
| ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL; |
| goto cleanup; |
| } |
| else if( stat( entry_name, &sb ) == -1 ) |
| { |
| ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; |
| goto cleanup; |
| } |
| |
| if( !S_ISREG( sb.st_mode ) ) |
| continue; |
| |
| // Ignore parse errors |
| // |
| t_ret = mbedtls_x509_crt_parse_file( chain, entry_name ); |
| if( t_ret < 0 ) |
| ret++; |
| else |
| ret += t_ret; |
| } |
| |
| cleanup: |
| closedir( dir ); |
| |
| #if defined(MBEDTLS_THREADING_C) |
| if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 ) |
| ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR; |
| #endif /* MBEDTLS_THREADING_C */ |
| |
| #endif /* _WIN32 */ |
| |
| return( ret ); |
| } |
| #endif /* MBEDTLS_FS_IO */ |
| |
| static int x509_info_subject_alt_name( char **buf, size_t *size, |
| const mbedtls_x509_sequence *subject_alt_name ) |
| { |
| size_t i; |
| size_t n = *size; |
| char *p = *buf; |
| const mbedtls_x509_sequence *cur = subject_alt_name; |
| const char *sep = ""; |
| size_t sep_len = 0; |
| |
| while( cur != NULL ) |
| { |
| if( cur->buf.len + sep_len >= n ) |
| { |
| *p = '\0'; |
| return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); |
| } |
| |
| n -= cur->buf.len + sep_len; |
| for( i = 0; i < sep_len; i++ ) |
| *p++ = sep[i]; |
| for( i = 0; i < cur->buf.len; i++ ) |
| *p++ = cur->buf.p[i]; |
| |
| sep = ", "; |
| sep_len = 2; |
| |
| cur = cur->next; |
| } |
| |
| *p = '\0'; |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| #define PRINT_ITEM(i) \ |
| { \ |
| ret = mbedtls_snprintf( p, n, "%s" i, sep ); \ |
| MBEDTLS_X509_SAFE_SNPRINTF; \ |
| sep = ", "; \ |
| } |
| |
| #define CERT_TYPE(type,name) \ |
| if( ns_cert_type & type ) \ |
| PRINT_ITEM( name ); |
| |
| static int x509_info_cert_type( char **buf, size_t *size, |
| unsigned char ns_cert_type ) |
| { |
| int ret; |
| size_t n = *size; |
| char *p = *buf; |
| const char *sep = ""; |
| |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" ); |
| CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" ); |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| #define KEY_USAGE(code,name) \ |
| if( key_usage & code ) \ |
| PRINT_ITEM( name ); |
| |
| static int x509_info_key_usage( char **buf, size_t *size, |
| unsigned int key_usage ) |
| { |
| int ret; |
| size_t n = *size; |
| char *p = *buf; |
| const char *sep = ""; |
| |
| KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" ); |
| KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" ); |
| KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" ); |
| KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" ); |
| KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" ); |
| KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" ); |
| KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" ); |
| KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" ); |
| KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" ); |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| static int x509_info_ext_key_usage( char **buf, size_t *size, |
| const mbedtls_x509_sequence *extended_key_usage ) |
| { |
| int ret; |
| const char *desc; |
| size_t n = *size; |
| char *p = *buf; |
| const mbedtls_x509_sequence *cur = extended_key_usage; |
| const char *sep = ""; |
| |
| while( cur != NULL ) |
| { |
| if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 ) |
| desc = "???"; |
| |
| ret = mbedtls_snprintf( p, n, "%s%s", sep, desc ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| sep = ", "; |
| |
| cur = cur->next; |
| } |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Like memcmp, but case-insensitive and always returns -1 if different |
| */ |
| static int x509_memcasecmp( const void *s1, const void *s2, size_t len ) |
| { |
| size_t i; |
| unsigned char diff; |
| const unsigned char *n1 = s1, *n2 = s2; |
| |
| for( i = 0; i < len; i++ ) |
| { |
| diff = n1[i] ^ n2[i]; |
| |
| if( diff == 0 ) |
| continue; |
| |
| if( diff == 32 && |
| ( ( n1[i] >= 'a' && n1[i] <= 'z' ) || |
| ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) ) |
| { |
| continue; |
| } |
| |
| return( -1 ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Return 0 if name matches wildcard, -1 otherwise |
| */ |
| static int x509_check_wildcard( const char *cn, mbedtls_x509_buf *name ) |
| { |
| size_t i; |
| size_t cn_idx = 0, cn_len = strlen( cn ); |
| |
| if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' ) |
| return( 0 ); |
| |
| for( i = 0; i < cn_len; ++i ) |
| { |
| if( cn[i] == '.' ) |
| { |
| cn_idx = i; |
| break; |
| } |
| } |
| |
| if( cn_idx == 0 ) |
| return( -1 ); |
| |
| if( cn_len - cn_idx == name->len - 1 && |
| x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Compare two X.509 strings, case-insensitive, and allowing for some encoding |
| * variations (but not all). |
| * |
| * Return 0 if equal, -1 otherwise. |
| */ |
| static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b ) |
| { |
| if( a->tag == b->tag && |
| a->len == b->len && |
| memcmp( a->p, b->p, b->len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && |
| ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && |
| a->len == b->len && |
| x509_memcasecmp( a->p, b->p, b->len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Compare two X.509 Names (aka rdnSequence). |
| * |
| * See RFC 5280 section 7.1, though we don't implement the whole algorithm: |
| * we sometimes return unequal when the full algorithm would return equal, |
| * but never the other way. (In particular, we don't do Unicode normalisation |
| * or space folding.) |
| * |
| * Return 0 if equal, -1 otherwise. |
| */ |
| static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b ) |
| { |
| /* Avoid recursion, it might not be optimised by the compiler */ |
| while( a != NULL || b != NULL ) |
| { |
| if( a == NULL || b == NULL ) |
| return( -1 ); |
| |
| /* type */ |
| if( a->oid.tag != b->oid.tag || |
| a->oid.len != b->oid.len || |
| memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 ) |
| { |
| return( -1 ); |
| } |
| |
| /* value */ |
| if( x509_string_cmp( &a->val, &b->val ) != 0 ) |
| return( -1 ); |
| |
| /* structure of the list of sets */ |
| if( a->next_merged != b->next_merged ) |
| return( -1 ); |
| |
| a = a->next; |
| b = b->next; |
| } |
| |
| /* a == NULL == b */ |
| return( 0 ); |
| } |
| |
| /* |
| * Return an informational string about the certificate. |
| */ |
| #define BEFORE_COLON 18 |
| #define BC "18" |
| int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix, |
| const mbedtls_x509_crt *crt ) |
| { |
| int ret; |
| size_t n; |
| char *p; |
| char key_size_str[BEFORE_COLON]; |
| |
| p = buf; |
| n = size; |
| |
| if( NULL == crt ) |
| { |
| ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| ret = mbedtls_snprintf( p, n, "%scert. version : %d\n", |
| prefix, crt->version ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| ret = mbedtls_snprintf( p, n, "%sserial number : ", |
| prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_x509_serial_gets( p, n, &crt->serial ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| ret = mbedtls_x509_dn_gets( p, n, &crt->issuer ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| ret = mbedtls_x509_dn_gets( p, n, &crt->subject ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_snprintf( p, n, "\n%sissued on : " \ |
| "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| crt->valid_from.year, crt->valid_from.mon, |
| crt->valid_from.day, crt->valid_from.hour, |
| crt->valid_from.min, crt->valid_from.sec ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \ |
| "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| crt->valid_to.year, crt->valid_to.mon, |
| crt->valid_to.day, crt->valid_to.hour, |
| crt->valid_to.min, crt->valid_to.sec ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk, |
| crt->sig_md, crt->sig_opts ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| /* Key size */ |
| if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON, |
| mbedtls_pk_get_name( &crt->pk ) ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str, |
| (int) mbedtls_pk_get_bitlen( &crt->pk ) ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| /* |
| * Optional extensions |
| */ |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS ) |
| { |
| ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix, |
| crt->ca_istrue ? "true" : "false" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| if( crt->max_pathlen > 0 ) |
| { |
| ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| } |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) |
| { |
| ret = mbedtls_snprintf( p, n, "\n%ssubject alt name : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| if( ( ret = x509_info_subject_alt_name( &p, &n, |
| &crt->subject_alt_names ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE ) |
| { |
| ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) |
| { |
| ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) |
| { |
| ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| if( ( ret = x509_info_ext_key_usage( &p, &n, |
| &crt->ext_key_usage ) ) != 0 ) |
| return( ret ); |
| } |
| |
| ret = mbedtls_snprintf( p, n, "\n" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| struct x509_crt_verify_string { |
| int code; |
| const char *string; |
| }; |
| |
| static const struct x509_crt_verify_string x509_crt_verify_strings[] = { |
| { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" }, |
| { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" }, |
| { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" }, |
| { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" }, |
| { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" }, |
| { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" }, |
| { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" }, |
| { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" }, |
| { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" }, |
| { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" }, |
| { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" }, |
| { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" }, |
| { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" }, |
| { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" }, |
| { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." }, |
| { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, |
| { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." }, |
| { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." }, |
| { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, |
| { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." }, |
| { 0, NULL } |
| }; |
| |
| int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix, |
| uint32_t flags ) |
| { |
| int ret; |
| const struct x509_crt_verify_string *cur; |
| char *p = buf; |
| size_t n = size; |
| |
| for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ ) |
| { |
| if( ( flags & cur->code ) == 0 ) |
| continue; |
| |
| ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| flags ^= cur->code; |
| } |
| |
| if( flags != 0 ) |
| { |
| ret = mbedtls_snprintf( p, n, "%sUnknown reason " |
| "(this should not happen)\n", prefix ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) |
| int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt, |
| unsigned int usage ) |
| { |
| unsigned int usage_must, usage_may; |
| unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY |
| | MBEDTLS_X509_KU_DECIPHER_ONLY; |
| |
| if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 ) |
| return( 0 ); |
| |
| usage_must = usage & ~may_mask; |
| |
| if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| usage_may = usage & may_mask; |
| |
| if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may ) |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| |
| return( 0 ); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) |
| int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt, |
| const char *usage_oid, |
| size_t usage_len ) |
| { |
| const mbedtls_x509_sequence *cur; |
| |
| /* Extension is not mandatory, absent means no restriction */ |
| if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 ) |
| return( 0 ); |
| |
| /* |
| * Look for the requested usage (or wildcard ANY) in our list |
| */ |
| for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next ) |
| { |
| const mbedtls_x509_buf *cur_oid = &cur->buf; |
| |
| if( cur_oid->len == usage_len && |
| memcmp( cur_oid->p, usage_oid, usage_len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 ) |
| return( 0 ); |
| } |
| |
| return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| } |
| #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ |
| |
| #if defined(MBEDTLS_X509_CRL_PARSE_C) |
| /* |
| * Return 1 if the certificate is revoked, or 0 otherwise. |
| */ |
| int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl ) |
| { |
| const mbedtls_x509_crl_entry *cur = &crl->entry; |
| |
| while( cur != NULL && cur->serial.len != 0 ) |
| { |
| if( crt->serial.len == cur->serial.len && |
| memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 ) |
| { |
| return( 1 ); |
| } |
| |
| cur = cur->next; |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Check that the given certificate is not revoked according to the CRL. |
| * Skip validation if no CRL for the given CA is present. |
| */ |
| static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca, |
| mbedtls_x509_crl *crl_list, |
| const mbedtls_x509_crt_profile *profile ) |
| { |
| int flags = 0; |
| unsigned char hash[MBEDTLS_MD_MAX_SIZE]; |
| const mbedtls_md_info_t *md_info; |
| |
| if( ca == NULL ) |
| return( flags ); |
| |
| while( crl_list != NULL ) |
| { |
| if( crl_list->version == 0 || |
| x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 ) |
| { |
| crl_list = crl_list->next; |
| continue; |
| } |
| |
| /* |
| * Check if the CA is configured to sign CRLs |
| */ |
| #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) |
| if( mbedtls_x509_crt_check_key_usage( ca, |
| MBEDTLS_X509_KU_CRL_SIGN ) != 0 ) |
| { |
| flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; |
| break; |
| } |
| #endif |
| |
| /* |
| * Check if CRL is correctly signed by the trusted CA |
| */ |
| if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 ) |
| flags |= MBEDTLS_X509_BADCRL_BAD_MD; |
| |
| if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 ) |
| flags |= MBEDTLS_X509_BADCRL_BAD_PK; |
| |
| md_info = mbedtls_md_info_from_type( crl_list->sig_md ); |
| if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 ) |
| { |
| /* Note: this can't happen except after an internal error */ |
| flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; |
| break; |
| } |
| |
| if( x509_profile_check_key( profile, crl_list->sig_pk, &ca->pk ) != 0 ) |
| flags |= MBEDTLS_X509_BADCERT_BAD_KEY; |
| |
| if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk, |
| crl_list->sig_md, hash, mbedtls_md_get_size( md_info ), |
| crl_list->sig.p, crl_list->sig.len ) != 0 ) |
| { |
| flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; |
| break; |
| } |
| |
| /* |
| * Check for validity of CRL (Do not drop out) |
| */ |
| if( mbedtls_x509_time_is_past( &crl_list->next_update ) ) |
| flags |= MBEDTLS_X509_BADCRL_EXPIRED; |
| |
| if( mbedtls_x509_time_is_future( &crl_list->this_update ) ) |
| flags |= MBEDTLS_X509_BADCRL_FUTURE; |
| |
| /* |
| * Check if certificate is revoked |
| */ |
| if( mbedtls_x509_crt_is_revoked( crt, crl_list ) ) |
| { |
| flags |= MBEDTLS_X509_BADCERT_REVOKED; |
| break; |
| } |
| |
| crl_list = crl_list->next; |
| } |
| |
| return( flags ); |
| } |
| #endif /* MBEDTLS_X509_CRL_PARSE_C */ |
| |
| /* |
| * Check if 'parent' is a suitable parent (signing CA) for 'child'. |
| * Return 0 if yes, -1 if not. |
| * |
| * top means parent is a locally-trusted certificate |
| * bottom means child is the end entity cert |
| */ |
| static int x509_crt_check_parent( const mbedtls_x509_crt *child, |
| const mbedtls_x509_crt *parent, |
| int top, int bottom ) |
| { |
| int need_ca_bit; |
| |
| /* Parent must be the issuer */ |
| if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 ) |
| return( -1 ); |
| |
| /* Parent must have the basicConstraints CA bit set as a general rule */ |
| need_ca_bit = 1; |
| |
| /* Exception: v1/v2 certificates that are locally trusted. */ |
| if( top && parent->version < 3 ) |
| need_ca_bit = 0; |
| |
| /* Exception: self-signed end-entity certs that are locally trusted. */ |
| if( top && bottom && |
| child->raw.len == parent->raw.len && |
| memcmp( child->raw.p, parent->raw.p, child->raw.len ) == 0 ) |
| { |
| need_ca_bit = 0; |
| } |
| |
| if( need_ca_bit && ! parent->ca_istrue ) |
| return( -1 ); |
| |
| #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) |
| if( need_ca_bit && |
| mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 ) |
| { |
| return( -1 ); |
| } |
| #endif |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Verify a certificate with no parent inside the chain |
| * (either the parent is a trusted root, or there is no parent) |
| * |
| * See comments for mbedtls_x509_crt_verify_with_profile() |
| * (also for notation used below) |
| * |
| * This function is called in two cases: |
| * - child was found to have a parent in trusted roots, in which case we're |
| * called with trust_ca pointing directly to that parent (not the full list) |
| * - this is cases 1, 2 and 3 of the comment on verify_with_profile() |
| * - case 1 is special as child and trust_ca point to copies of the same |
| * certificate then |
| * - child was found to have no parent either in the chain or in trusted CAs |
| * - this is cases 4 and 5 of the comment on verify_with_profile() |
| * |
| * For historical reasons, the function currently does not assume that |
| * trust_ca points directly to the right root in the first case, and it |
| * doesn't know in which case it starts, so it always starts by searching for |
| * a parent in trust_ca. |
| */ |
| static int x509_crt_verify_top( |
| mbedtls_x509_crt *child, mbedtls_x509_crt *trust_ca, |
| mbedtls_x509_crl *ca_crl, |
| const mbedtls_x509_crt_profile *profile, |
| int path_cnt, int self_cnt, uint32_t *flags, |
| int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), |
| void *p_vrfy ) |
| { |
| int ret; |
| uint32_t ca_flags = 0; |
| int check_path_cnt; |
| unsigned char hash[MBEDTLS_MD_MAX_SIZE]; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_x509_crt *future_past_ca = NULL; |
| |
| if( mbedtls_x509_time_is_past( &child->valid_to ) ) |
| *flags |= MBEDTLS_X509_BADCERT_EXPIRED; |
| |
| if( mbedtls_x509_time_is_future( &child->valid_from ) ) |
| *flags |= MBEDTLS_X509_BADCERT_FUTURE; |
| |
| if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_MD; |
| |
| if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_PK; |
| |
| /* |
| * Child is the top of the chain. Check against the trust_ca list. |
| */ |
| *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; |
| |
| md_info = mbedtls_md_info_from_type( child->sig_md ); |
| if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 ) |
| { |
| /* Note: this can't happen except after an internal error */ |
| /* Cannot check signature, no need to try any CA */ |
| trust_ca = NULL; |
| } |
| |
| for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next ) |
| { |
| if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 ) |
| continue; |
| |
| check_path_cnt = path_cnt + 1; |
| |
| /* |
| * Reduce check_path_cnt to check against if top of the chain is |
| * the same as the trusted CA |
| */ |
| if( child->subject_raw.len == trust_ca->subject_raw.len && |
| memcmp( child->subject_raw.p, trust_ca->subject_raw.p, |
| child->subject_raw.len ) == 0 ) |
| { |
| check_path_cnt--; |
| } |
| |
| /* Self signed certificates do not count towards the limit */ |
| if( trust_ca->max_pathlen > 0 && |
| trust_ca->max_pathlen < check_path_cnt - self_cnt ) |
| { |
| continue; |
| } |
| |
| if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &trust_ca->pk, |
| child->sig_md, hash, mbedtls_md_get_size( md_info ), |
| child->sig.p, child->sig.len ) != 0 ) |
| { |
| continue; |
| } |
| |
| if( mbedtls_x509_time_is_past( &trust_ca->valid_to ) || |
| mbedtls_x509_time_is_future( &trust_ca->valid_from ) ) |
| { |
| if ( future_past_ca == NULL ) |
| future_past_ca = trust_ca; |
| |
| continue; |
| } |
| |
| break; |
| } |
| |
| if( trust_ca != NULL || ( trust_ca = future_past_ca ) != NULL ) |
| { |
| /* |
| * Top of chain is signed by a trusted CA |
| */ |
| *flags &= ~MBEDTLS_X509_BADCERT_NOT_TRUSTED; |
| |
| if( x509_profile_check_key( profile, child->sig_pk, &trust_ca->pk ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; |
| } |
| |
| /* |
| * If top of chain is not the same as the trusted CA send a verify request |
| * to the callback for any issues with validity and CRL presence for the |
| * trusted CA certificate. |
| */ |
| if( trust_ca != NULL && |
| ( child->subject_raw.len != trust_ca->subject_raw.len || |
| memcmp( child->subject_raw.p, trust_ca->subject_raw.p, |
| child->subject_raw.len ) != 0 ) ) |
| { |
| #if defined(MBEDTLS_X509_CRL_PARSE_C) |
| /* Check trusted CA's CRL for the chain's top crt */ |
| *flags |= x509_crt_verifycrl( child, trust_ca, ca_crl, profile ); |
| #else |
| ((void) ca_crl); |
| #endif |
| |
| if( mbedtls_x509_time_is_past( &trust_ca->valid_to ) ) |
| ca_flags |= MBEDTLS_X509_BADCERT_EXPIRED; |
| |
| if( mbedtls_x509_time_is_future( &trust_ca->valid_from ) ) |
| ca_flags |= MBEDTLS_X509_BADCERT_FUTURE; |
| |
| if( NULL != f_vrfy ) |
| { |
| if( ( ret = f_vrfy( p_vrfy, trust_ca, path_cnt + 1, |
| &ca_flags ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| } |
| } |
| |
| /* Call callback on top cert */ |
| if( NULL != f_vrfy ) |
| { |
| if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) |
| return( ret ); |
| } |
| |
| *flags |= ca_flags; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Verify a certificate with a parent inside the chain |
| * |
| * See comments for mbedtls_x509_crt_verify_with_profile() |
| */ |
| static int x509_crt_verify_child( |
| mbedtls_x509_crt *child, mbedtls_x509_crt *parent, |
| mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl, |
| const mbedtls_x509_crt_profile *profile, |
| int path_cnt, int self_cnt, uint32_t *flags, |
| int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), |
| void *p_vrfy ) |
| { |
| int ret; |
| uint32_t parent_flags = 0; |
| unsigned char hash[MBEDTLS_MD_MAX_SIZE]; |
| mbedtls_x509_crt *grandparent; |
| const mbedtls_md_info_t *md_info; |
| |
| /* Counting intermediate self signed certificates */ |
| if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 ) |
| self_cnt++; |
| |
| /* path_cnt is 0 for the first intermediate CA */ |
| if( 1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA ) |
| { |
| /* return immediately as the goal is to avoid unbounded recursion */ |
| return( MBEDTLS_ERR_X509_FATAL_ERROR ); |
| } |
| |
| if( mbedtls_x509_time_is_past( &child->valid_to ) ) |
| *flags |= MBEDTLS_X509_BADCERT_EXPIRED; |
| |
| if( mbedtls_x509_time_is_future( &child->valid_from ) ) |
| *flags |= MBEDTLS_X509_BADCERT_FUTURE; |
| |
| if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_MD; |
| |
| if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_PK; |
| |
| md_info = mbedtls_md_info_from_type( child->sig_md ); |
| if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 ) |
| { |
| /* Note: this can't happen except after an internal error */ |
| *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; |
| } |
| else |
| { |
| if( x509_profile_check_key( profile, child->sig_pk, &parent->pk ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; |
| |
| if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk, |
| child->sig_md, hash, mbedtls_md_get_size( md_info ), |
| child->sig.p, child->sig.len ) != 0 ) |
| { |
| *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; |
| } |
| } |
| |
| #if defined(MBEDTLS_X509_CRL_PARSE_C) |
| /* Check trusted CA's CRL for the given crt */ |
| *flags |= x509_crt_verifycrl(child, parent, ca_crl, profile ); |
| #endif |
| |
| /* Look for a grandparent in trusted CAs */ |
| for( grandparent = trust_ca; |
| grandparent != NULL; |
| grandparent = grandparent->next ) |
| { |
| if( x509_crt_check_parent( parent, grandparent, |
| 0, path_cnt == 0 ) == 0 ) |
| break; |
| } |
| |
| if( grandparent != NULL ) |
| { |
| ret = x509_crt_verify_top( parent, grandparent, ca_crl, profile, |
| path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| else |
| { |
| /* Look for a grandparent upwards the chain */ |
| for( grandparent = parent->next; |
| grandparent != NULL; |
| grandparent = grandparent->next ) |
| { |
| /* +2 because the current step is not yet accounted for |
| * and because max_pathlen is one higher than it should be. |
| * Also self signed certificates do not count to the limit. */ |
| if( grandparent->max_pathlen > 0 && |
| grandparent->max_pathlen < 2 + path_cnt - self_cnt ) |
| { |
| continue; |
| } |
| |
| if( x509_crt_check_parent( parent, grandparent, |
| 0, path_cnt == 0 ) == 0 ) |
| break; |
| } |
| |
| /* Is our parent part of the chain or at the top? */ |
| if( grandparent != NULL ) |
| { |
| ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl, |
| profile, path_cnt + 1, self_cnt, &parent_flags, |
| f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| else |
| { |
| ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile, |
| path_cnt + 1, self_cnt, &parent_flags, |
| f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| } |
| |
| /* child is verified to be a child of the parent, call verify callback */ |
| if( NULL != f_vrfy ) |
| if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) |
| return( ret ); |
| |
| *flags |= parent_flags; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Verify the certificate validity |
| */ |
| int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt, |
| mbedtls_x509_crt *trust_ca, |
| mbedtls_x509_crl *ca_crl, |
| const char *cn, uint32_t *flags, |
| int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), |
| void *p_vrfy ) |
| { |
| return( mbedtls_x509_crt_verify_with_profile( crt, trust_ca, ca_crl, |
| &mbedtls_x509_crt_profile_default, cn, flags, f_vrfy, p_vrfy ) ); |
| } |
| |
| |
| /* |
| * Verify the certificate validity, with profile |
| * |
| * The chain building/verification is spread accross 4 functions: |
| * - this one |
| * - x509_crt_verify_child() |
| * - x509_crt_verify_top() |
| * - x509_crt_check_parent() |
| * |
| * There are five main cases to consider. Let's introduce some notation: |
| * - E means the end-entity certificate |
| * - I an intermediate CA |
| * - R the trusted root CA this chain anchors to |
| * - T the list of trusted roots (R and possible some others) |
| * |
| * The main cases with the calling sequence of the crt_verify_xxx() are: |
| * 1. E = R (explicitly trusted EE cert) |
| * verify(E, T) -> verify_top(E, R) |
| * 2. E -> R (EE signed by trusted root) |
| * verify(E, T) -> verify_top(E, R) |
| * 3. E -> I -> R (EE signed by intermediate signed by trusted root) |
| * verify(E, T) -> verify_child(E, I, T) -> verify_top(I, R) |
| * (plus variant with multiple intermediates) |
| * 4. E -> I (EE signed by intermediate that's not trusted) |
| * verify(E, T) -> verify_child(E, I, T) -> verify_top(I, T) |
| * (plus variant with multiple intermediates) |
| * 5. E (EE not trusted) |
| * verify(E, T) -> verify_top(E, T) |
| * |
| * Note: this notation and case numbering is also used in x509_crt_verify_top() |
| */ |
| int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt, |
| mbedtls_x509_crt *trust_ca, |
| mbedtls_x509_crl *ca_crl, |
| const mbedtls_x509_crt_profile *profile, |
| const char *cn, uint32_t *flags, |
| int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), |
| void *p_vrfy ) |
| { |
| size_t cn_len; |
| int ret; |
| int pathlen = 0, selfsigned = 0; |
| mbedtls_x509_crt *parent; |
| mbedtls_x509_name *name; |
| mbedtls_x509_sequence *cur = NULL; |
| mbedtls_pk_type_t pk_type; |
| |
| *flags = 0; |
| |
| if( profile == NULL ) |
| { |
| ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA; |
| goto exit; |
| } |
| |
| if( cn != NULL ) |
| { |
| name = &crt->subject; |
| cn_len = strlen( cn ); |
| |
| if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) |
| { |
| cur = &crt->subject_alt_names; |
| |
| while( cur != NULL ) |
| { |
| if( cur->buf.len == cn_len && |
| x509_memcasecmp( cn, cur->buf.p, cn_len ) == 0 ) |
| break; |
| |
| if( cur->buf.len > 2 && |
| memcmp( cur->buf.p, "*.", 2 ) == 0 && |
| x509_check_wildcard( cn, &cur->buf ) == 0 ) |
| { |
| break; |
| } |
| |
| cur = cur->next; |
| } |
| |
| if( cur == NULL ) |
| *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; |
| } |
| else |
| { |
| while( name != NULL ) |
| { |
| if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 ) |
| { |
| if( name->val.len == cn_len && |
| x509_memcasecmp( name->val.p, cn, cn_len ) == 0 ) |
| break; |
| |
| if( name->val.len > 2 && |
| memcmp( name->val.p, "*.", 2 ) == 0 && |
| x509_check_wildcard( cn, &name->val ) == 0 ) |
| break; |
| } |
| |
| name = name->next; |
| } |
| |
| if( name == NULL ) |
| *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; |
| } |
| } |
| |
| /* Check the type and size of the key */ |
| pk_type = mbedtls_pk_get_type( &crt->pk ); |
| |
| if( x509_profile_check_pk_alg( profile, pk_type ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_PK; |
| |
| if( x509_profile_check_key( profile, pk_type, &crt->pk ) != 0 ) |
| *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; |
| |
| /* Look for a parent in trusted CAs */ |
| for( parent = trust_ca; parent != NULL; parent = parent->next ) |
| { |
| if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 ) |
| break; |
| } |
| |
| if( parent != NULL ) |
| { |
| ret = x509_crt_verify_top( crt, parent, ca_crl, profile, |
| pathlen, selfsigned, flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| goto exit; |
| } |
| else |
| { |
| /* Look for a parent upwards the chain */ |
| for( parent = crt->next; parent != NULL; parent = parent->next ) |
| if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 ) |
| break; |
| |
| /* Are we part of the chain or at the top? */ |
| if( parent != NULL ) |
| { |
| ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile, |
| pathlen, selfsigned, flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| goto exit; |
| } |
| else |
| { |
| ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile, |
| pathlen, selfsigned, flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| goto exit; |
| } |
| } |
| |
| exit: |
| /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by |
| * the SSL module for authmode optional, but non-zero return from the |
| * callback means a fatal error so it shouldn't be ignored */ |
| if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ) |
| ret = MBEDTLS_ERR_X509_FATAL_ERROR; |
| |
| if( ret != 0 ) |
| { |
| *flags = (uint32_t) -1; |
| return( ret ); |
| } |
| |
| if( *flags != 0 ) |
| return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Initialize a certificate chain |
| */ |
| void mbedtls_x509_crt_init( mbedtls_x509_crt *crt ) |
| { |
| memset( crt, 0, sizeof(mbedtls_x509_crt) ); |
| } |
| |
| /* |
| * Unallocate all certificate data |
| */ |
| void mbedtls_x509_crt_free( mbedtls_x509_crt *crt ) |
| { |
| mbedtls_x509_crt *cert_cur = crt; |
| mbedtls_x509_crt *cert_prv; |
| mbedtls_x509_name *name_cur; |
| mbedtls_x509_name *name_prv; |
| mbedtls_x509_sequence *seq_cur; |
| mbedtls_x509_sequence *seq_prv; |
| |
| if( crt == NULL ) |
| return; |
| |
| do |
| { |
| mbedtls_pk_free( &cert_cur->pk ); |
| |
| #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| mbedtls_free( cert_cur->sig_opts ); |
| #endif |
| |
| name_cur = cert_cur->issuer.next; |
| while( name_cur != NULL ) |
| { |
| name_prv = name_cur; |
| name_cur = name_cur->next; |
| mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); |
| mbedtls_free( name_prv ); |
| } |
| |
| name_cur = cert_cur->subject.next; |
| while( name_cur != NULL ) |
| { |
| name_prv = name_cur; |
| name_cur = name_cur->next; |
| mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); |
| mbedtls_free( name_prv ); |
| } |
| |
| seq_cur = cert_cur->ext_key_usage.next; |
| while( seq_cur != NULL ) |
| { |
| seq_prv = seq_cur; |
| seq_cur = seq_cur->next; |
| mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) ); |
| mbedtls_free( seq_prv ); |
| } |
| |
| seq_cur = cert_cur->subject_alt_names.next; |
| while( seq_cur != NULL ) |
| { |
| seq_prv = seq_cur; |
| seq_cur = seq_cur->next; |
| mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) ); |
| mbedtls_free( seq_prv ); |
| } |
| |
| if( cert_cur->raw.p != NULL ) |
| { |
| mbedtls_zeroize( cert_cur->raw.p, cert_cur->raw.len ); |
| mbedtls_free( cert_cur->raw.p ); |
| } |
| |
| cert_cur = cert_cur->next; |
| } |
| while( cert_cur != NULL ); |
| |
| cert_cur = crt; |
| do |
| { |
| cert_prv = cert_cur; |
| cert_cur = cert_cur->next; |
| |
| mbedtls_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) ); |
| if( cert_prv != crt ) |
| mbedtls_free( cert_prv ); |
| } |
| while( cert_cur != NULL ); |
| } |
| |
| #endif /* MBEDTLS_X509_CRT_PARSE_C */ |