Branch data Line data Source code
1 : : /* $OpenBSD: kexgex.c,v 1.28 2014/01/09 23:20:00 djm Exp $ */
2 : : /*
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"
28 : :
29 : : #include <sys/types.h>
30 : :
31 : : #include <openssl/evp.h>
32 : : #include <signal.h>
33 : :
34 : : #include "buffer.h"
35 : : #include "key.h"
36 : : #include "cipher.h"
37 : : #include "kex.h"
38 : : #include "ssh2.h"
39 : : #include "digest.h"
40 : : #include "log.h"
41 : :
42 : : void
43 : 64 : kexgex_hash(
44 : : int hash_alg,
45 : : char *client_version_string,
46 : : char *server_version_string,
47 : : char *ckexinit, int ckexinitlen,
48 : : char *skexinit, int skexinitlen,
49 : : u_char *serverhostkeyblob, int sbloblen,
50 : : int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
51 : : BIGNUM *client_dh_pub,
52 : : BIGNUM *server_dh_pub,
53 : : BIGNUM *shared_secret,
54 : : u_char **hash, u_int *hashlen)
55 : : {
56 : : Buffer b;
57 : : static u_char digest[SSH_DIGEST_MAX_LENGTH];
58 : :
59 : 64 : buffer_init(&b);
60 : 64 : buffer_put_cstring(&b, client_version_string);
61 : 64 : buffer_put_cstring(&b, server_version_string);
62 : :
63 : : /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
64 : 64 : buffer_put_int(&b, ckexinitlen+1);
65 : 64 : buffer_put_char(&b, SSH2_MSG_KEXINIT);
66 : 64 : buffer_append(&b, ckexinit, ckexinitlen);
67 : 64 : buffer_put_int(&b, skexinitlen+1);
68 : 64 : buffer_put_char(&b, SSH2_MSG_KEXINIT);
69 : 64 : buffer_append(&b, skexinit, skexinitlen);
70 : :
71 : 64 : buffer_put_string(&b, serverhostkeyblob, sbloblen);
72 [ - + ]: 64 : if (min == -1 || max == -1)
73 : 0 : buffer_put_int(&b, wantbits);
74 : : else {
75 : 64 : buffer_put_int(&b, min);
76 : 64 : buffer_put_int(&b, wantbits);
77 : 64 : buffer_put_int(&b, max);
78 : : }
79 : 64 : buffer_put_bignum2(&b, prime);
80 : 64 : buffer_put_bignum2(&b, gen);
81 : 64 : buffer_put_bignum2(&b, client_dh_pub);
82 : 64 : buffer_put_bignum2(&b, server_dh_pub);
83 : 64 : buffer_put_bignum2(&b, shared_secret);
84 : :
85 : : #ifdef DEBUG_KEXDH
86 : : buffer_dump(&b);
87 : : #endif
88 [ - + ]: 64 : if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0)
89 : 0 : fatal("%s: ssh_digest_buffer failed", __func__);
90 : :
91 : 64 : buffer_free(&b);
92 : :
93 : : #ifdef DEBUG_KEX
94 : : dump_digest("hash", digest, ssh_digest_bytes(hash_alg));
95 : : #endif
96 : 64 : *hash = digest;
97 : 64 : *hashlen = ssh_digest_bytes(hash_alg);
98 : 64 : }
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