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Diffstat (limited to 'kexdhc.c')
-rw-r--r-- | kexdhc.c | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/kexdhc.c b/kexdhc.c deleted file mode 100644 index 8b56377ad..000000000 --- a/kexdhc.c +++ /dev/null | |||
@@ -1,224 +0,0 @@ | |||
1 | /* $OpenBSD: kexdhc.c,v 1.22 2018/02/07 02:06:51 jsing 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 <openssl/dh.h> | ||
33 | |||
34 | #include <stdarg.h> | ||
35 | #include <stdio.h> | ||
36 | #include <string.h> | ||
37 | #include <signal.h> | ||
38 | |||
39 | #include "openbsd-compat/openssl-compat.h" | ||
40 | |||
41 | #include "sshkey.h" | ||
42 | #include "cipher.h" | ||
43 | #include "digest.h" | ||
44 | #include "kex.h" | ||
45 | #include "log.h" | ||
46 | #include "packet.h" | ||
47 | #include "dh.h" | ||
48 | #include "ssh2.h" | ||
49 | #include "dispatch.h" | ||
50 | #include "compat.h" | ||
51 | #include "ssherr.h" | ||
52 | #include "sshbuf.h" | ||
53 | |||
54 | static int input_kex_dh(int, u_int32_t, struct ssh *); | ||
55 | |||
56 | int | ||
57 | kexdh_client(struct ssh *ssh) | ||
58 | { | ||
59 | struct kex *kex = ssh->kex; | ||
60 | int r; | ||
61 | const BIGNUM *pub_key; | ||
62 | |||
63 | /* generate and send 'e', client DH public key */ | ||
64 | switch (kex->kex_type) { | ||
65 | case KEX_DH_GRP1_SHA1: | ||
66 | kex->dh = dh_new_group1(); | ||
67 | break; | ||
68 | case KEX_DH_GRP14_SHA1: | ||
69 | case KEX_DH_GRP14_SHA256: | ||
70 | kex->dh = dh_new_group14(); | ||
71 | break; | ||
72 | case KEX_DH_GRP16_SHA512: | ||
73 | kex->dh = dh_new_group16(); | ||
74 | break; | ||
75 | case KEX_DH_GRP18_SHA512: | ||
76 | kex->dh = dh_new_group18(); | ||
77 | break; | ||
78 | default: | ||
79 | r = SSH_ERR_INVALID_ARGUMENT; | ||
80 | goto out; | ||
81 | } | ||
82 | if (kex->dh == NULL) { | ||
83 | r = SSH_ERR_ALLOC_FAIL; | ||
84 | goto out; | ||
85 | } | ||
86 | debug("sending SSH2_MSG_KEXDH_INIT"); | ||
87 | if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0) | ||
88 | goto out; | ||
89 | DH_get0_key(kex->dh, &pub_key, NULL); | ||
90 | if ((r = sshpkt_start(ssh, SSH2_MSG_KEXDH_INIT)) != 0 || | ||
91 | (r = sshpkt_put_bignum2(ssh, pub_key)) != 0 || | ||
92 | (r = sshpkt_send(ssh)) != 0) | ||
93 | goto out; | ||
94 | #ifdef DEBUG_KEXDH | ||
95 | DHparams_print_fp(stderr, kex->dh); | ||
96 | fprintf(stderr, "pub= "); | ||
97 | BN_print_fp(stderr, pub_key); | ||
98 | fprintf(stderr, "\n"); | ||
99 | #endif | ||
100 | debug("expecting SSH2_MSG_KEXDH_REPLY"); | ||
101 | ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_REPLY, &input_kex_dh); | ||
102 | r = 0; | ||
103 | out: | ||
104 | return r; | ||
105 | } | ||
106 | |||
107 | static int | ||
108 | input_kex_dh(int type, u_int32_t seq, struct ssh *ssh) | ||
109 | { | ||
110 | struct kex *kex = ssh->kex; | ||
111 | BIGNUM *dh_server_pub = NULL, *shared_secret = NULL; | ||
112 | const BIGNUM *pub_key; | ||
113 | struct sshkey *server_host_key = NULL; | ||
114 | u_char *kbuf = NULL, *server_host_key_blob = NULL, *signature = NULL; | ||
115 | u_char hash[SSH_DIGEST_MAX_LENGTH]; | ||
116 | size_t klen = 0, slen, sbloblen, hashlen; | ||
117 | int kout, r; | ||
118 | |||
119 | if (kex->verify_host_key == NULL) { | ||
120 | r = SSH_ERR_INVALID_ARGUMENT; | ||
121 | goto out; | ||
122 | } | ||
123 | /* key, cert */ | ||
124 | if ((r = sshpkt_get_string(ssh, &server_host_key_blob, | ||
125 | &sbloblen)) != 0 || | ||
126 | (r = sshkey_from_blob(server_host_key_blob, sbloblen, | ||
127 | &server_host_key)) != 0) | ||
128 | goto out; | ||
129 | if (server_host_key->type != kex->hostkey_type || | ||
130 | (kex->hostkey_type == KEY_ECDSA && | ||
131 | server_host_key->ecdsa_nid != kex->hostkey_nid)) { | ||
132 | r = SSH_ERR_KEY_TYPE_MISMATCH; | ||
133 | goto out; | ||
134 | } | ||
135 | if (kex->verify_host_key(server_host_key, ssh) == -1) { | ||
136 | r = SSH_ERR_SIGNATURE_INVALID; | ||
137 | goto out; | ||
138 | } | ||
139 | /* DH parameter f, server public DH key */ | ||
140 | if ((dh_server_pub = BN_new()) == NULL) { | ||
141 | r = SSH_ERR_ALLOC_FAIL; | ||
142 | goto out; | ||
143 | } | ||
144 | /* signed H */ | ||
145 | if ((r = sshpkt_get_bignum2(ssh, dh_server_pub)) != 0 || | ||
146 | (r = sshpkt_get_string(ssh, &signature, &slen)) != 0 || | ||
147 | (r = sshpkt_get_end(ssh)) != 0) | ||
148 | goto out; | ||
149 | #ifdef DEBUG_KEXDH | ||
150 | fprintf(stderr, "dh_server_pub= "); | ||
151 | BN_print_fp(stderr, dh_server_pub); | ||
152 | fprintf(stderr, "\n"); | ||
153 | debug("bits %d", BN_num_bits(dh_server_pub)); | ||
154 | #endif | ||
155 | if (!dh_pub_is_valid(kex->dh, dh_server_pub)) { | ||
156 | sshpkt_disconnect(ssh, "bad server public DH value"); | ||
157 | r = SSH_ERR_MESSAGE_INCOMPLETE; | ||
158 | goto out; | ||
159 | } | ||
160 | |||
161 | klen = DH_size(kex->dh); | ||
162 | if ((kbuf = malloc(klen)) == NULL || | ||
163 | (shared_secret = BN_new()) == NULL) { | ||
164 | r = SSH_ERR_ALLOC_FAIL; | ||
165 | goto out; | ||
166 | } | ||
167 | if ((kout = DH_compute_key(kbuf, dh_server_pub, kex->dh)) < 0 || | ||
168 | BN_bin2bn(kbuf, kout, shared_secret) == NULL) { | ||
169 | r = SSH_ERR_LIBCRYPTO_ERROR; | ||
170 | goto out; | ||
171 | } | ||
172 | #ifdef DEBUG_KEXDH | ||
173 | dump_digest("shared secret", kbuf, kout); | ||
174 | #endif | ||
175 | |||
176 | /* calc and verify H */ | ||
177 | DH_get0_key(kex->dh, &pub_key, NULL); | ||
178 | hashlen = sizeof(hash); | ||
179 | if ((r = kex_dh_hash( | ||
180 | kex->hash_alg, | ||
181 | kex->client_version_string, | ||
182 | kex->server_version_string, | ||
183 | sshbuf_ptr(kex->my), sshbuf_len(kex->my), | ||
184 | sshbuf_ptr(kex->peer), sshbuf_len(kex->peer), | ||
185 | server_host_key_blob, sbloblen, | ||
186 | pub_key, | ||
187 | dh_server_pub, | ||
188 | shared_secret, | ||
189 | hash, &hashlen)) != 0) | ||
190 | goto out; | ||
191 | |||
192 | if ((r = sshkey_verify(server_host_key, signature, slen, hash, hashlen, | ||
193 | kex->hostkey_alg, ssh->compat)) != 0) | ||
194 | goto out; | ||
195 | |||
196 | /* save session id */ | ||
197 | if (kex->session_id == NULL) { | ||
198 | kex->session_id_len = hashlen; | ||
199 | kex->session_id = malloc(kex->session_id_len); | ||
200 | if (kex->session_id == NULL) { | ||
201 | r = SSH_ERR_ALLOC_FAIL; | ||
202 | goto out; | ||
203 | } | ||
204 | memcpy(kex->session_id, hash, kex->session_id_len); | ||
205 | } | ||
206 | |||
207 | if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0) | ||
208 | r = kex_send_newkeys(ssh); | ||
209 | out: | ||
210 | explicit_bzero(hash, sizeof(hash)); | ||
211 | DH_free(kex->dh); | ||
212 | kex->dh = NULL; | ||
213 | BN_clear_free(dh_server_pub); | ||
214 | if (kbuf) { | ||
215 | explicit_bzero(kbuf, klen); | ||
216 | free(kbuf); | ||
217 | } | ||
218 | BN_clear_free(shared_secret); | ||
219 | sshkey_free(server_host_key); | ||
220 | free(server_host_key_blob); | ||
221 | free(signature); | ||
222 | return r; | ||
223 | } | ||
224 | #endif /* WITH_OPENSSL */ | ||