markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 1 | /* $OpenBSD: kexdh.c,v 1.25 2015/01/19 20:16:15 markus Exp $ */ |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | */ |
| 25 | |
| 26 | #include "includes.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 27 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 28 | #ifdef WITH_OPENSSL |
| 29 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 30 | #include <sys/types.h> |
| 31 | |
| 32 | #include <signal.h> |
| 33 | |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 34 | #include <openssl/evp.h> |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 35 | |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 36 | #include "ssh2.h" |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 37 | #include "sshkey.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 38 | #include "cipher.h" |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 39 | #include "kex.h" |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 40 | #include "ssherr.h" |
| 41 | #include "sshbuf.h" |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 42 | #include "digest.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 43 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 44 | int |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 45 | kex_dh_hash( |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 46 | const char *client_version_string, |
| 47 | const char *server_version_string, |
| 48 | const u_char *ckexinit, size_t ckexinitlen, |
| 49 | const u_char *skexinit, size_t skexinitlen, |
| 50 | const u_char *serverhostkeyblob, size_t sbloblen, |
| 51 | const BIGNUM *client_dh_pub, |
| 52 | const BIGNUM *server_dh_pub, |
| 53 | const BIGNUM *shared_secret, |
| 54 | u_char *hash, size_t *hashlen) |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 55 | { |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 56 | struct sshbuf *b; |
| 57 | int r; |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 58 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 59 | if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1)) |
| 60 | return SSH_ERR_INVALID_ARGUMENT; |
| 61 | if ((b = sshbuf_new()) == NULL) |
| 62 | return SSH_ERR_ALLOC_FAIL; |
| 63 | if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 || |
| 64 | (r = sshbuf_put_cstring(b, server_version_string)) != 0 || |
| 65 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ |
| 66 | (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 || |
| 67 | (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || |
| 68 | (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 || |
| 69 | (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 || |
| 70 | (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || |
| 71 | (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 || |
| 72 | (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 || |
| 73 | (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 || |
| 74 | (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 || |
| 75 | (r = sshbuf_put_bignum2(b, shared_secret)) != 0) { |
| 76 | sshbuf_free(b); |
| 77 | return r; |
| 78 | } |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 79 | #ifdef DEBUG_KEX |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 80 | sshbuf_dump(b, stderr); |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 81 | #endif |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 82 | if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, *hashlen) != 0) { |
| 83 | sshbuf_free(b); |
| 84 | return SSH_ERR_LIBCRYPTO_ERROR; |
| 85 | } |
| 86 | sshbuf_free(b); |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 87 | *hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 88 | #ifdef DEBUG_KEX |
| 89 | dump_digest("hash", hash, *hashlen); |
| 90 | #endif |
| 91 | return 0; |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 92 | } |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 93 | #endif /* WITH_OPENSSL */ |