1 /*
2 * Copyright (c) 2001 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25 #include "includes.h"
26 RCSID("$OpenBSD: kexdh.c,v 1.18 2002/03/18 17:50:31 provos Exp $");
27
28 #pragma ident "%Z%%M% %I% %E% SMI"
29
30 #include <openssl/opensslconf.h>
31 #include <openssl/crypto.h>
32 #include <openssl/bn.h>
33
34 #include "xmalloc.h"
35 #include "buffer.h"
36 #include "bufaux.h"
37 #include "key.h"
38 #include "kex.h"
39 #include "log.h"
40 #include "packet.h"
41 #include "dh.h"
42 #include "ssh2.h"
43
44 void
45 kexdh_server(Kex *kex)
46 {
47 BIGNUM *shared_secret = NULL, *dh_client_pub = NULL;
48 DH *dh;
49 Key *server_host_key;
50 u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
51 u_int sbloblen, klen, kout;
52 u_int slen;
53
54 /* generate server DH public key */
55 dh = dh_new_group1();
56 dh_gen_key(dh, kex->we_need * 8);
57
58 debug("expecting SSH2_MSG_KEXDH_INIT");
59 packet_read_expect(SSH2_MSG_KEXDH_INIT);
60
61 if (kex->load_host_key == NULL)
62 fatal("Cannot load hostkey");
63 server_host_key = kex->load_host_key(kex->hostkey_type);
64 if (server_host_key == NULL)
65 fatal("Unsupported hostkey type %d", kex->hostkey_type);
66
67 /* key, cert */
68 if ((dh_client_pub = BN_new()) == NULL)
69 fatal("dh_client_pub == NULL");
70 packet_get_bignum2(dh_client_pub);
71 packet_check_eom();
72
73 #ifdef DEBUG_KEXDH
74 fprintf(stderr, "dh_client_pub= ");
75 BN_print_fp(stderr, dh_client_pub);
76 fprintf(stderr, "\n");
77 debug("bits %d", BN_num_bits(dh_client_pub));
78 #endif
79
80 #ifdef DEBUG_KEXDH
81 DHparams_print_fp(stderr, dh);
82 fprintf(stderr, "pub= ");
83 BN_print_fp(stderr, dh->pub_key);
84 fprintf(stderr, "\n");
85 #endif
86 if (!dh_pub_is_valid(dh, dh_client_pub))
87 packet_disconnect("bad client public DH value");
88
89 klen = DH_size(dh);
90 kbuf = xmalloc(klen);
91 kout = DH_compute_key(kbuf, dh_client_pub, dh);
92 #ifdef DEBUG_KEXDH
93 dump_digest("shared secret", kbuf, kout);
94 #endif
95 if ((shared_secret = BN_new()) == NULL)
96 fatal("kexdh_server: BN_new failed");
97 BN_bin2bn(kbuf, kout, shared_secret);
98 memset(kbuf, 0, klen);
99 xfree(kbuf);
100
101 key_to_blob(server_host_key, &server_host_key_blob, &sbloblen);
102
103 /* calc H */
104 hash = kex_dh_hash(
105 kex->client_version_string,
106 kex->server_version_string,
107 buffer_ptr(&kex->peer), buffer_len(&kex->peer),
108 buffer_ptr(&kex->my), buffer_len(&kex->my),
109 server_host_key_blob, sbloblen,
110 dh_client_pub,
111 dh->pub_key,
112 shared_secret
113 );
114 BN_clear_free(dh_client_pub);
115
116 /* save session id := H */
117 /* XXX hashlen depends on KEX */
118 if (kex->session_id == NULL) {
119 kex->session_id_len = 20;
120 kex->session_id = xmalloc(kex->session_id_len);
121 memcpy(kex->session_id, hash, kex->session_id_len);
122 }
123
124 /* sign H */
125 /* XXX hashlen depends on KEX */
126 key_sign(server_host_key, &signature, &slen, hash, 20);
127
128 /* destroy_sensitive_data(); */
129
130 /* send server hostkey, DH pubkey 'f' and singed H */
131 packet_start(SSH2_MSG_KEXDH_REPLY);
132 packet_put_string(server_host_key_blob, sbloblen);
133 packet_put_bignum2(dh->pub_key); /* f */
134 packet_put_string(signature, slen);
135 packet_send();
136
137 xfree(signature);
138 xfree(server_host_key_blob);
139 /* have keys, free DH */
140 DH_free(dh);
141
142 kex_derive_keys(kex, hash, shared_secret);
143 BN_clear_free(shared_secret);
144 kex_finish(kex);
145 }