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markus@openbsd.org57d10cb2015-01-19 20:16:15 +00001/* $OpenBSD: kexgex.c,v 1.29 2015/01/19 20:16:15 markus Exp $ */
Ben Lindstrom22b19b42001-04-04 17:39:19 +00002/*
3 * Copyright (c) 2000 Niels Provos. All rights reserved.
4 * Copyright (c) 2001 Markus Friedl. 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
27#include "includes.h"
Ben Lindstrom22b19b42001-04-04 17:39:19 +000028
Damien Miller72ef7c12015-01-15 02:21:31 +110029#ifdef WITH_OPENSSL
30
Damien Millerd7834352006-08-05 12:39:39 +100031#include <sys/types.h>
32
Damien Miller8e7fb332003-02-24 12:03:03 +110033#include <openssl/evp.h>
Damien Millerd7834352006-08-05 12:39:39 +100034#include <signal.h>
Ben Lindstrom22b19b42001-04-04 17:39:19 +000035
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000036#include "sshkey.h"
Damien Millerd7834352006-08-05 12:39:39 +100037#include "cipher.h"
Ben Lindstrom22b19b42001-04-04 17:39:19 +000038#include "kex.h"
Ben Lindstrom22b19b42001-04-04 17:39:19 +000039#include "ssh2.h"
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000040#include "ssherr.h"
41#include "sshbuf.h"
Damien Millerb3051d02014-01-10 10:58:53 +110042#include "digest.h"
Ben Lindstrom22b19b42001-04-04 17:39:19 +000043
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000044int
Ben Lindstrom22b19b42001-04-04 17:39:19 +000045kexgex_hash(
Damien Millerb3051d02014-01-10 10:58:53 +110046 int hash_alg,
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000047 const char *client_version_string,
48 const char *server_version_string,
49 const u_char *ckexinit, size_t ckexinitlen,
50 const u_char *skexinit, size_t skexinitlen,
51 const u_char *serverhostkeyblob, size_t sbloblen,
52 int min, int wantbits, int max,
53 const BIGNUM *prime,
54 const BIGNUM *gen,
55 const BIGNUM *client_dh_pub,
56 const BIGNUM *server_dh_pub,
57 const BIGNUM *shared_secret,
58 u_char *hash, size_t *hashlen)
Ben Lindstrom22b19b42001-04-04 17:39:19 +000059{
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000060 struct sshbuf *b;
61 int r;
Ben Lindstrom22b19b42001-04-04 17:39:19 +000062
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000063 if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
64 return SSH_ERR_INVALID_ARGUMENT;
65 if ((b = sshbuf_new()) == NULL)
66 return SSH_ERR_ALLOC_FAIL;
67 if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
68 (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
69 /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
70 (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
71 (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
72 (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
73 (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
74 (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
75 (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
76 (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
77 (min != -1 && (r = sshbuf_put_u32(b, min)) != 0) ||
78 (r = sshbuf_put_u32(b, wantbits)) != 0 ||
79 (max != -1 && (r = sshbuf_put_u32(b, max)) != 0) ||
80 (r = sshbuf_put_bignum2(b, prime)) != 0 ||
81 (r = sshbuf_put_bignum2(b, gen)) != 0 ||
82 (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
83 (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
84 (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
85 sshbuf_free(b);
86 return r;
Ben Lindstrom22b19b42001-04-04 17:39:19 +000087 }
Ben Lindstrom22b19b42001-04-04 17:39:19 +000088#ifdef DEBUG_KEXDH
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000089 sshbuf_dump(b, stderr);
Ben Lindstrom22b19b42001-04-04 17:39:19 +000090#endif
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000091 if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
92 sshbuf_free(b);
93 return SSH_ERR_LIBCRYPTO_ERROR;
94 }
95 sshbuf_free(b);
Damien Millerb3051d02014-01-10 10:58:53 +110096 *hashlen = ssh_digest_bytes(hash_alg);
markus@openbsd.org57d10cb2015-01-19 20:16:15 +000097#ifdef DEBUG_KEXDH
98 dump_digest("hash", hash, *hashlen);
99#endif
100 return 0;
Ben Lindstrom22b19b42001-04-04 17:39:19 +0000101}
Damien Miller72ef7c12015-01-15 02:21:31 +1100102#endif /* WITH_OPENSSL */