Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 1 | /* $OpenBSD: kexecdh.c,v 1.5 2014/01/09 23:20:00 djm Exp $ */ |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
| 4 | * Copyright (c) 2010 Damien Miller. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
Damien Miller | c79ff07 | 2010-08-31 22:50:48 +1000 | [diff] [blame] | 27 | #include "includes.h" |
| 28 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 29 | #if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 30 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 31 | #include <sys/types.h> |
| 32 | |
| 33 | #include <signal.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | #include <openssl/bn.h> |
| 37 | #include <openssl/evp.h> |
| 38 | #include <openssl/ec.h> |
| 39 | #include <openssl/ecdh.h> |
| 40 | |
| 41 | #include "buffer.h" |
| 42 | #include "ssh2.h" |
| 43 | #include "key.h" |
| 44 | #include "cipher.h" |
| 45 | #include "kex.h" |
| 46 | #include "log.h" |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 47 | #include "digest.h" |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 48 | |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 49 | void |
| 50 | kex_ecdh_hash( |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 51 | int hash_alg, |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 52 | const EC_GROUP *ec_group, |
| 53 | char *client_version_string, |
| 54 | char *server_version_string, |
| 55 | char *ckexinit, int ckexinitlen, |
| 56 | char *skexinit, int skexinitlen, |
| 57 | u_char *serverhostkeyblob, int sbloblen, |
| 58 | const EC_POINT *client_dh_pub, |
| 59 | const EC_POINT *server_dh_pub, |
| 60 | const BIGNUM *shared_secret, |
| 61 | u_char **hash, u_int *hashlen) |
| 62 | { |
| 63 | Buffer b; |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 64 | static u_char digest[SSH_DIGEST_MAX_LENGTH]; |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 65 | |
| 66 | buffer_init(&b); |
| 67 | buffer_put_cstring(&b, client_version_string); |
| 68 | buffer_put_cstring(&b, server_version_string); |
| 69 | |
| 70 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ |
| 71 | buffer_put_int(&b, ckexinitlen+1); |
| 72 | buffer_put_char(&b, SSH2_MSG_KEXINIT); |
| 73 | buffer_append(&b, ckexinit, ckexinitlen); |
| 74 | buffer_put_int(&b, skexinitlen+1); |
| 75 | buffer_put_char(&b, SSH2_MSG_KEXINIT); |
| 76 | buffer_append(&b, skexinit, skexinitlen); |
| 77 | |
| 78 | buffer_put_string(&b, serverhostkeyblob, sbloblen); |
| 79 | buffer_put_ecpoint(&b, ec_group, client_dh_pub); |
| 80 | buffer_put_ecpoint(&b, ec_group, server_dh_pub); |
| 81 | buffer_put_bignum2(&b, shared_secret); |
| 82 | |
| 83 | #ifdef DEBUG_KEX |
| 84 | buffer_dump(&b); |
| 85 | #endif |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 86 | if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0) |
| 87 | fatal("%s: ssh_digest_buffer failed", __func__); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 88 | |
| 89 | buffer_free(&b); |
| 90 | |
| 91 | #ifdef DEBUG_KEX |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 92 | dump_digest("hash", digest, ssh_digest_bytes(hash_alg)); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 93 | #endif |
| 94 | *hash = digest; |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 95 | *hashlen = ssh_digest_bytes(hash_alg); |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 96 | } |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 97 | #endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */ |