| /* Copyright (c) 2004-2006, Sara Golemon <sarag@libssh2.org> |
| * Copyright (c) 2009-2014 by Daniel Stenberg |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, |
| * with or without modification, are permitted provided |
| * that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the |
| * following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * Neither the name of the copyright holder nor the names |
| * of any other contributors may be used to endorse or |
| * promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE |
| * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| */ |
| |
| #include "libssh2_priv.h" |
| #include "misc.h" |
| |
| /* Needed for struct iovec on some platforms */ |
| #ifdef HAVE_SYS_UIO_H |
| #include <sys/uio.h> |
| #endif |
| |
| #if LIBSSH2_RSA |
| /* *********** |
| * ssh-rsa * |
| *********** */ |
| |
| static int hostkey_method_ssh_rsa_dtor(LIBSSH2_SESSION * session, |
| void **abstract); |
| |
| /* |
| * hostkey_method_ssh_rsa_init |
| * |
| * Initialize the server hostkey working area with e/n pair |
| */ |
| static int |
| hostkey_method_ssh_rsa_init(LIBSSH2_SESSION * session, |
| const unsigned char *hostkey_data, |
| size_t hostkey_data_len, |
| void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx; |
| const unsigned char *s, *e, *n; |
| unsigned long len, e_len, n_len; |
| int ret; |
| |
| (void) hostkey_data_len; |
| |
| if (*abstract) { |
| hostkey_method_ssh_rsa_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| s = hostkey_data; |
| len = _libssh2_ntohu32(s); |
| s += 4; |
| |
| if (len != 7 || strncmp((char *) s, "ssh-rsa", 7) != 0) { |
| return -1; |
| } |
| s += 7; |
| |
| e_len = _libssh2_ntohu32(s); |
| s += 4; |
| |
| e = s; |
| s += e_len; |
| n_len = _libssh2_ntohu32(s); |
| s += 4; |
| n = s; |
| |
| ret = _libssh2_rsa_new(&rsactx, e, e_len, n, n_len, NULL, 0, |
| NULL, 0, NULL, 0, NULL, 0, NULL, 0, NULL, 0); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = rsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * hostkey_method_ssh_rsa_initPEM |
| * |
| * Load a Private Key from a PEM file |
| */ |
| static int |
| hostkey_method_ssh_rsa_initPEM(LIBSSH2_SESSION * session, |
| const char *privkeyfile, |
| unsigned const char *passphrase, |
| void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx; |
| int ret; |
| |
| if (*abstract) { |
| hostkey_method_ssh_rsa_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| ret = _libssh2_rsa_new_private(&rsactx, session, privkeyfile, passphrase); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = rsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * hostkey_method_ssh_rsa_initPEMFromMemory |
| * |
| * Load a Private Key from a memory |
| */ |
| static int |
| hostkey_method_ssh_rsa_initPEMFromMemory(LIBSSH2_SESSION * session, |
| const char *privkeyfiledata, |
| size_t privkeyfiledata_len, |
| unsigned const char *passphrase, |
| void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx; |
| int ret; |
| |
| if (*abstract) { |
| hostkey_method_ssh_rsa_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| ret = _libssh2_rsa_new_private_frommemory(&rsactx, session, |
| privkeyfiledata, |
| privkeyfiledata_len, passphrase); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = rsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * hostkey_method_ssh_rsa_sign |
| * |
| * Verify signature created by remote |
| */ |
| static int |
| hostkey_method_ssh_rsa_sig_verify(LIBSSH2_SESSION * session, |
| const unsigned char *sig, |
| size_t sig_len, |
| const unsigned char *m, |
| size_t m_len, void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx = (libssh2_rsa_ctx *) (*abstract); |
| (void) session; |
| |
| /* Skip past keyname_len(4) + keyname(7){"ssh-rsa"} + signature_len(4) */ |
| sig += 15; |
| sig_len -= 15; |
| return _libssh2_rsa_sha1_verify(rsactx, sig, sig_len, m, m_len); |
| } |
| |
| /* |
| * hostkey_method_ssh_rsa_signv |
| * |
| * Construct a signature from an array of vectors |
| */ |
| static int |
| hostkey_method_ssh_rsa_signv(LIBSSH2_SESSION * session, |
| unsigned char **signature, |
| size_t *signature_len, |
| int veccount, |
| const struct iovec datavec[], |
| void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx = (libssh2_rsa_ctx *) (*abstract); |
| |
| #ifdef _libssh2_rsa_sha1_signv |
| return _libssh2_rsa_sha1_signv(session, signature, signature_len, |
| veccount, datavec, rsactx); |
| #else |
| int ret; |
| int i; |
| unsigned char hash[SHA_DIGEST_LENGTH]; |
| libssh2_sha1_ctx ctx; |
| |
| libssh2_sha1_init(&ctx); |
| for(i = 0; i < veccount; i++) { |
| libssh2_sha1_update(ctx, datavec[i].iov_base, datavec[i].iov_len); |
| } |
| libssh2_sha1_final(ctx, hash); |
| |
| ret = _libssh2_rsa_sha1_sign(session, rsactx, hash, SHA_DIGEST_LENGTH, |
| signature, signature_len); |
| if (ret) { |
| return -1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| /* |
| * hostkey_method_ssh_rsa_dtor |
| * |
| * Shutdown the hostkey |
| */ |
| static int |
| hostkey_method_ssh_rsa_dtor(LIBSSH2_SESSION * session, void **abstract) |
| { |
| libssh2_rsa_ctx *rsactx = (libssh2_rsa_ctx *) (*abstract); |
| (void) session; |
| |
| _libssh2_rsa_free(rsactx); |
| |
| *abstract = NULL; |
| |
| return 0; |
| } |
| |
| #ifdef OPENSSL_NO_MD5 |
| #define MD5_DIGEST_LENGTH 16 |
| #endif |
| |
| static const LIBSSH2_HOSTKEY_METHOD hostkey_method_ssh_rsa = { |
| "ssh-rsa", |
| MD5_DIGEST_LENGTH, |
| hostkey_method_ssh_rsa_init, |
| hostkey_method_ssh_rsa_initPEM, |
| hostkey_method_ssh_rsa_initPEMFromMemory, |
| hostkey_method_ssh_rsa_sig_verify, |
| hostkey_method_ssh_rsa_signv, |
| NULL, /* encrypt */ |
| hostkey_method_ssh_rsa_dtor, |
| }; |
| #endif /* LIBSSH2_RSA */ |
| |
| #if LIBSSH2_DSA |
| /* *********** |
| * ssh-dss * |
| *********** */ |
| |
| static int hostkey_method_ssh_dss_dtor(LIBSSH2_SESSION * session, |
| void **abstract); |
| |
| /* |
| * hostkey_method_ssh_dss_init |
| * |
| * Initialize the server hostkey working area with p/q/g/y set |
| */ |
| static int |
| hostkey_method_ssh_dss_init(LIBSSH2_SESSION * session, |
| const unsigned char *hostkey_data, |
| size_t hostkey_data_len, |
| void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx; |
| const unsigned char *p, *q, *g, *y, *s; |
| unsigned long p_len, q_len, g_len, y_len, len; |
| int ret; |
| |
| (void) hostkey_data_len; |
| |
| if (*abstract) { |
| hostkey_method_ssh_dss_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| s = hostkey_data; |
| len = _libssh2_ntohu32(s); |
| s += 4; |
| if (len != 7 || strncmp((char *) s, "ssh-dss", 7) != 0) { |
| return -1; |
| } |
| s += 7; |
| |
| p_len = _libssh2_ntohu32(s); |
| s += 4; |
| p = s; |
| s += p_len; |
| q_len = _libssh2_ntohu32(s); |
| s += 4; |
| q = s; |
| s += q_len; |
| g_len = _libssh2_ntohu32(s); |
| s += 4; |
| g = s; |
| s += g_len; |
| y_len = _libssh2_ntohu32(s); |
| s += 4; |
| y = s; |
| /* s += y_len; */ |
| |
| ret = _libssh2_dsa_new(&dsactx, p, p_len, q, q_len, |
| g, g_len, y, y_len, NULL, 0); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = dsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * hostkey_method_ssh_dss_initPEM |
| * |
| * Load a Private Key from a PEM file |
| */ |
| static int |
| hostkey_method_ssh_dss_initPEM(LIBSSH2_SESSION * session, |
| const char *privkeyfile, |
| unsigned const char *passphrase, |
| void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx; |
| int ret; |
| |
| if (*abstract) { |
| hostkey_method_ssh_dss_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| ret = _libssh2_dsa_new_private(&dsactx, session, privkeyfile, passphrase); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = dsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * hostkey_method_ssh_dss_initPEMFromMemory |
| * |
| * Load a Private Key from memory |
| */ |
| static int |
| hostkey_method_ssh_dss_initPEMFromMemory(LIBSSH2_SESSION * session, |
| const char *privkeyfiledata, |
| size_t privkeyfiledata_len, |
| unsigned const char *passphrase, |
| void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx; |
| int ret; |
| |
| if (*abstract) { |
| hostkey_method_ssh_dss_dtor(session, abstract); |
| *abstract = NULL; |
| } |
| |
| ret = _libssh2_dsa_new_private_frommemory(&dsactx, session, |
| privkeyfiledata, |
| privkeyfiledata_len, passphrase); |
| if (ret) { |
| return -1; |
| } |
| |
| *abstract = dsactx; |
| |
| return 0; |
| } |
| |
| /* |
| * libssh2_hostkey_method_ssh_dss_sign |
| * |
| * Verify signature created by remote |
| */ |
| static int |
| hostkey_method_ssh_dss_sig_verify(LIBSSH2_SESSION * session, |
| const unsigned char *sig, |
| size_t sig_len, |
| const unsigned char *m, |
| size_t m_len, void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx = (libssh2_dsa_ctx *) (*abstract); |
| |
| /* Skip past keyname_len(4) + keyname(7){"ssh-dss"} + signature_len(4) */ |
| sig += 15; |
| sig_len -= 15; |
| if (sig_len != 40) { |
| return _libssh2_error(session, LIBSSH2_ERROR_PROTO, |
| "Invalid DSS signature length"); |
| } |
| return _libssh2_dsa_sha1_verify(dsactx, sig, m, m_len); |
| } |
| |
| /* |
| * hostkey_method_ssh_dss_signv |
| * |
| * Construct a signature from an array of vectors |
| */ |
| static int |
| hostkey_method_ssh_dss_signv(LIBSSH2_SESSION * session, |
| unsigned char **signature, |
| size_t *signature_len, |
| int veccount, |
| const struct iovec datavec[], |
| void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx = (libssh2_dsa_ctx *) (*abstract); |
| unsigned char hash[SHA_DIGEST_LENGTH]; |
| libssh2_sha1_ctx ctx; |
| int i; |
| |
| *signature = LIBSSH2_CALLOC(session, 2 * SHA_DIGEST_LENGTH); |
| if (!*signature) { |
| return -1; |
| } |
| |
| *signature_len = 2 * SHA_DIGEST_LENGTH; |
| |
| libssh2_sha1_init(&ctx); |
| for(i = 0; i < veccount; i++) { |
| libssh2_sha1_update(ctx, datavec[i].iov_base, datavec[i].iov_len); |
| } |
| libssh2_sha1_final(ctx, hash); |
| |
| if (_libssh2_dsa_sha1_sign(dsactx, hash, SHA_DIGEST_LENGTH, *signature)) { |
| LIBSSH2_FREE(session, *signature); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * libssh2_hostkey_method_ssh_dss_dtor |
| * |
| * Shutdown the hostkey method |
| */ |
| static int |
| hostkey_method_ssh_dss_dtor(LIBSSH2_SESSION * session, void **abstract) |
| { |
| libssh2_dsa_ctx *dsactx = (libssh2_dsa_ctx *) (*abstract); |
| (void) session; |
| |
| _libssh2_dsa_free(dsactx); |
| |
| *abstract = NULL; |
| |
| return 0; |
| } |
| |
| static const LIBSSH2_HOSTKEY_METHOD hostkey_method_ssh_dss = { |
| "ssh-dss", |
| MD5_DIGEST_LENGTH, |
| hostkey_method_ssh_dss_init, |
| hostkey_method_ssh_dss_initPEM, |
| hostkey_method_ssh_dss_initPEMFromMemory, |
| hostkey_method_ssh_dss_sig_verify, |
| hostkey_method_ssh_dss_signv, |
| NULL, /* encrypt */ |
| hostkey_method_ssh_dss_dtor, |
| }; |
| #endif /* LIBSSH2_DSA */ |
| |
| static const LIBSSH2_HOSTKEY_METHOD *hostkey_methods[] = { |
| #if LIBSSH2_RSA |
| &hostkey_method_ssh_rsa, |
| #endif /* LIBSSH2_RSA */ |
| #if LIBSSH2_DSA |
| &hostkey_method_ssh_dss, |
| #endif /* LIBSSH2_DSA */ |
| NULL |
| }; |
| |
| const LIBSSH2_HOSTKEY_METHOD ** |
| libssh2_hostkey_methods(void) |
| { |
| return hostkey_methods; |
| } |
| |
| /* |
| * libssh2_hostkey_hash |
| * |
| * Returns hash signature |
| * Returned buffer should NOT be freed |
| * Length of buffer is determined by hash type |
| * i.e. MD5 == 16, SHA1 == 20 |
| */ |
| LIBSSH2_API const char * |
| libssh2_hostkey_hash(LIBSSH2_SESSION * session, int hash_type) |
| { |
| switch (hash_type) { |
| #if LIBSSH2_MD5 |
| case LIBSSH2_HOSTKEY_HASH_MD5: |
| return (session->server_hostkey_md5_valid) |
| ? (char *) session->server_hostkey_md5 |
| : NULL; |
| break; |
| #endif /* LIBSSH2_MD5 */ |
| case LIBSSH2_HOSTKEY_HASH_SHA1: |
| return (session->server_hostkey_sha1_valid) |
| ? (char *) session->server_hostkey_sha1 |
| : NULL; |
| break; |
| default: |
| return NULL; |
| } |
| } |
| |
| static int hostkey_type(const unsigned char *hostkey, size_t len) |
| { |
| const unsigned char rsa[] = { |
| 0, 0, 0, 0x07, 's', 's', 'h', '-', 'r', 's', 'a' |
| }; |
| const unsigned char dss[] = { |
| 0, 0, 0, 0x07, 's', 's', 'h', '-', 'd', 's', 's' |
| }; |
| |
| if (len < 11) |
| return LIBSSH2_HOSTKEY_TYPE_UNKNOWN; |
| |
| if (!memcmp(rsa, hostkey, 11)) |
| return LIBSSH2_HOSTKEY_TYPE_RSA; |
| |
| if (!memcmp(dss, hostkey, 11)) |
| return LIBSSH2_HOSTKEY_TYPE_DSS; |
| |
| return LIBSSH2_HOSTKEY_TYPE_UNKNOWN; |
| } |
| |
| /* |
| * libssh2_session_hostkey() |
| * |
| * Returns the server key and length. |
| * |
| */ |
| LIBSSH2_API const char * |
| libssh2_session_hostkey(LIBSSH2_SESSION *session, size_t *len, int *type) |
| { |
| if(session->server_hostkey_len) { |
| if(len) |
| *len = session->server_hostkey_len; |
| if (type) |
| *type = hostkey_type(session->server_hostkey, |
| session->server_hostkey_len); |
| return (char *) session->server_hostkey; |
| } |
| if(len) |
| *len = 0; |
| return NULL; |
| } |
| |
