Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.26
1.26 ! djm 1: /* $OpenBSD: kexdh.c,v 1.25 2015/01/19 20:16:15 markus Exp $ */
1.1 markus 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:
1.23 deraadt 26: #include <sys/types.h>
27:
28: #include <signal.h>
1.1 markus 29:
1.19 markus 30: #include <openssl/evp.h>
1.1 markus 31:
1.19 markus 32: #include "ssh2.h"
1.25 markus 33: #include "sshkey.h"
1.23 deraadt 34: #include "cipher.h"
1.1 markus 35: #include "kex.h"
1.25 markus 36: #include "ssherr.h"
37: #include "sshbuf.h"
1.24 djm 38: #include "digest.h"
1.1 markus 39:
1.25 markus 40: int
1.1 markus 41: kex_dh_hash(
1.26 ! djm 42: int hash_alg,
1.25 markus 43: const char *client_version_string,
44: const char *server_version_string,
45: const u_char *ckexinit, size_t ckexinitlen,
46: const u_char *skexinit, size_t skexinitlen,
47: const u_char *serverhostkeyblob, size_t sbloblen,
48: const BIGNUM *client_dh_pub,
49: const BIGNUM *server_dh_pub,
50: const BIGNUM *shared_secret,
51: u_char *hash, size_t *hashlen)
1.1 markus 52: {
1.25 markus 53: struct sshbuf *b;
54: int r;
1.1 markus 55:
1.26 ! djm 56: if (*hashlen < ssh_digest_bytes(hash_alg))
1.25 markus 57: return SSH_ERR_INVALID_ARGUMENT;
58: if ((b = sshbuf_new()) == NULL)
59: return SSH_ERR_ALLOC_FAIL;
60: if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
61: (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
62: /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
63: (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
64: (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
65: (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
66: (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
67: (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
68: (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
69: (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
70: (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
71: (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
72: (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
73: sshbuf_free(b);
74: return r;
75: }
1.1 markus 76: #ifdef DEBUG_KEX
1.25 markus 77: sshbuf_dump(b, stderr);
1.1 markus 78: #endif
1.26 ! djm 79: if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
1.25 markus 80: sshbuf_free(b);
81: return SSH_ERR_LIBCRYPTO_ERROR;
82: }
83: sshbuf_free(b);
1.26 ! djm 84: *hashlen = ssh_digest_bytes(hash_alg);
1.1 markus 85: #ifdef DEBUG_KEX
1.25 markus 86: dump_digest("hash", hash, *hashlen);
1.1 markus 87: #endif
1.25 markus 88: return 0;
1.1 markus 89: }