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Diffstat (limited to 'kexdhs.c')
-rw-r--r-- | kexdhs.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/kexdhs.c b/kexdhs.c deleted file mode 100644 index 337aab5be..000000000 --- a/kexdhs.c +++ /dev/null | |||
@@ -1,222 +0,0 @@ | |||
1 | /* $OpenBSD: kexdhs.c,v 1.27 2018/04/10 00:10:49 djm Exp $ */ | ||
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" | ||
27 | |||
28 | #ifdef WITH_OPENSSL | ||
29 | |||
30 | #include <sys/types.h> | ||
31 | |||
32 | #include <stdarg.h> | ||
33 | #include <string.h> | ||
34 | #include <signal.h> | ||
35 | |||
36 | #include <openssl/dh.h> | ||
37 | |||
38 | #include "openbsd-compat/openssl-compat.h" | ||
39 | |||
40 | #include "sshkey.h" | ||
41 | #include "cipher.h" | ||
42 | #include "digest.h" | ||
43 | #include "kex.h" | ||
44 | #include "log.h" | ||
45 | #include "packet.h" | ||
46 | #include "dh.h" | ||
47 | #include "ssh2.h" | ||
48 | |||
49 | #include "dispatch.h" | ||
50 | #include "compat.h" | ||
51 | #include "ssherr.h" | ||
52 | #include "sshbuf.h" | ||
53 | |||
54 | static int input_kex_dh_init(int, u_int32_t, struct ssh *); | ||
55 | |||
56 | int | ||
57 | kexdh_server(struct ssh *ssh) | ||
58 | { | ||
59 | struct kex *kex = ssh->kex; | ||
60 | int r; | ||
61 | |||
62 | /* generate server DH public key */ | ||
63 | switch (kex->kex_type) { | ||
64 | case KEX_DH_GRP1_SHA1: | ||
65 | kex->dh = dh_new_group1(); | ||
66 | break; | ||
67 | case KEX_DH_GRP14_SHA1: | ||
68 | case KEX_DH_GRP14_SHA256: | ||
69 | kex->dh = dh_new_group14(); | ||
70 | break; | ||
71 | case KEX_DH_GRP16_SHA512: | ||
72 | kex->dh = dh_new_group16(); | ||
73 | break; | ||
74 | case KEX_DH_GRP18_SHA512: | ||
75 | kex->dh = dh_new_group18(); | ||
76 | break; | ||
77 | default: | ||
78 | r = SSH_ERR_INVALID_ARGUMENT; | ||
79 | goto out; | ||
80 | } | ||
81 | if (kex->dh == NULL) { | ||
82 | r = SSH_ERR_ALLOC_FAIL; | ||
83 | goto out; | ||
84 | } | ||
85 | if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0) | ||
86 | goto out; | ||
87 | |||
88 | debug("expecting SSH2_MSG_KEXDH_INIT"); | ||
89 | ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_INIT, &input_kex_dh_init); | ||
90 | r = 0; | ||
91 | out: | ||
92 | return r; | ||
93 | } | ||
94 | |||
95 | int | ||
96 | input_kex_dh_init(int type, u_int32_t seq, struct ssh *ssh) | ||
97 | { | ||
98 | struct kex *kex = ssh->kex; | ||
99 | BIGNUM *shared_secret = NULL, *dh_client_pub = NULL; | ||
100 | const BIGNUM *pub_key; | ||
101 | struct sshkey *server_host_public, *server_host_private; | ||
102 | u_char *kbuf = NULL, *signature = NULL, *server_host_key_blob = NULL; | ||
103 | u_char hash[SSH_DIGEST_MAX_LENGTH]; | ||
104 | size_t sbloblen, slen; | ||
105 | size_t klen = 0, hashlen; | ||
106 | int kout, r; | ||
107 | |||
108 | if (kex->load_host_public_key == NULL || | ||
109 | kex->load_host_private_key == NULL) { | ||
110 | r = SSH_ERR_INVALID_ARGUMENT; | ||
111 | goto out; | ||
112 | } | ||
113 | server_host_public = kex->load_host_public_key(kex->hostkey_type, | ||
114 | kex->hostkey_nid, ssh); | ||
115 | server_host_private = kex->load_host_private_key(kex->hostkey_type, | ||
116 | kex->hostkey_nid, ssh); | ||
117 | if (server_host_public == NULL) { | ||
118 | r = SSH_ERR_NO_HOSTKEY_LOADED; | ||
119 | goto out; | ||
120 | } | ||
121 | |||
122 | /* key, cert */ | ||
123 | if ((dh_client_pub = BN_new()) == NULL) { | ||
124 | r = SSH_ERR_ALLOC_FAIL; | ||
125 | goto out; | ||
126 | } | ||
127 | DH_get0_key(kex->dh, &pub_key, NULL); | ||
128 | if ((r = sshpkt_get_bignum2(ssh, dh_client_pub)) != 0 || | ||
129 | (r = sshpkt_get_end(ssh)) != 0) | ||
130 | goto out; | ||
131 | |||
132 | #ifdef DEBUG_KEXDH | ||
133 | fprintf(stderr, "dh_client_pub= "); | ||
134 | BN_print_fp(stderr, dh_client_pub); | ||
135 | fprintf(stderr, "\n"); | ||
136 | debug("bits %d", BN_num_bits(dh_client_pub)); | ||
137 | DHparams_print_fp(stderr, kex->dh); | ||
138 | fprintf(stderr, "pub= "); | ||
139 | BN_print_fp(stderr, pub_key); | ||
140 | fprintf(stderr, "\n"); | ||
141 | #endif | ||
142 | if (!dh_pub_is_valid(kex->dh, dh_client_pub)) { | ||
143 | sshpkt_disconnect(ssh, "bad client public DH value"); | ||
144 | r = SSH_ERR_MESSAGE_INCOMPLETE; | ||
145 | goto out; | ||
146 | } | ||
147 | |||
148 | klen = DH_size(kex->dh); | ||
149 | if ((kbuf = malloc(klen)) == NULL || | ||
150 | (shared_secret = BN_new()) == NULL) { | ||
151 | r = SSH_ERR_ALLOC_FAIL; | ||
152 | goto out; | ||
153 | } | ||
154 | if ((kout = DH_compute_key(kbuf, dh_client_pub, kex->dh)) < 0 || | ||
155 | BN_bin2bn(kbuf, kout, shared_secret) == NULL) { | ||
156 | r = SSH_ERR_LIBCRYPTO_ERROR; | ||
157 | goto out; | ||
158 | } | ||
159 | #ifdef DEBUG_KEXDH | ||
160 | dump_digest("shared secret", kbuf, kout); | ||
161 | #endif | ||
162 | if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob, | ||
163 | &sbloblen)) != 0) | ||
164 | goto out; | ||
165 | /* calc H */ | ||
166 | hashlen = sizeof(hash); | ||
167 | if ((r = kex_dh_hash( | ||
168 | kex->hash_alg, | ||
169 | kex->client_version_string, | ||
170 | kex->server_version_string, | ||
171 | sshbuf_ptr(kex->peer), sshbuf_len(kex->peer), | ||
172 | sshbuf_ptr(kex->my), sshbuf_len(kex->my), | ||
173 | server_host_key_blob, sbloblen, | ||
174 | dh_client_pub, | ||
175 | pub_key, | ||
176 | shared_secret, | ||
177 | hash, &hashlen)) != 0) | ||
178 | goto out; | ||
179 | |||
180 | /* save session id := H */ | ||
181 | if (kex->session_id == NULL) { | ||
182 | kex->session_id_len = hashlen; | ||
183 | kex->session_id = malloc(kex->session_id_len); | ||
184 | if (kex->session_id == NULL) { | ||
185 | r = SSH_ERR_ALLOC_FAIL; | ||
186 | goto out; | ||
187 | } | ||
188 | memcpy(kex->session_id, hash, kex->session_id_len); | ||
189 | } | ||
190 | |||
191 | /* sign H */ | ||
192 | if ((r = kex->sign(server_host_private, server_host_public, &signature, | ||
193 | &slen, hash, hashlen, kex->hostkey_alg, ssh->compat)) < 0) | ||
194 | goto out; | ||
195 | |||
196 | /* destroy_sensitive_data(); */ | ||
197 | |||
198 | /* send server hostkey, DH pubkey 'f' and signed H */ | ||
199 | if ((r = sshpkt_start(ssh, SSH2_MSG_KEXDH_REPLY)) != 0 || | ||
200 | (r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 || | ||
201 | (r = sshpkt_put_bignum2(ssh, pub_key)) != 0 || /* f */ | ||
202 | (r = sshpkt_put_string(ssh, signature, slen)) != 0 || | ||
203 | (r = sshpkt_send(ssh)) != 0) | ||
204 | goto out; | ||
205 | |||
206 | if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0) | ||
207 | r = kex_send_newkeys(ssh); | ||
208 | out: | ||
209 | explicit_bzero(hash, sizeof(hash)); | ||
210 | DH_free(kex->dh); | ||
211 | kex->dh = NULL; | ||
212 | BN_clear_free(dh_client_pub); | ||
213 | if (kbuf) { | ||
214 | explicit_bzero(kbuf, klen); | ||
215 | free(kbuf); | ||
216 | } | ||
217 | BN_clear_free(shared_secret); | ||
218 | free(server_host_key_blob); | ||
219 | free(signature); | ||
220 | return r; | ||
221 | } | ||
222 | #endif /* WITH_OPENSSL */ | ||