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kexecdhc.c

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1/* $OpenBSD: kexecdhc.c,v 1.13 2018/02/07 02:06:51 jsing Exp $ */-
2/*-
3 * Copyright (c) 2001 Markus Friedl. All rights reserved.-
4 * Copyright (c) 2010 Damien Miller. 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#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC)-
30-
31#include <sys/types.h>-
32-
33#include <stdio.h>-
34#include <string.h>-
35#include <signal.h>-
36-
37#include <openssl/ecdh.h>-
38-
39#include "sshkey.h"-
40#include "cipher.h"-
41#include "digest.h"-
42#include "kex.h"-
43#include "log.h"-
44#include "packet.h"-
45#include "dh.h"-
46#include "ssh2.h"-
47#include "dispatch.h"-
48#include "compat.h"-
49#include "ssherr.h"-
50#include "sshbuf.h"-
51-
52static int input_kex_ecdh_reply(int, u_int32_t, struct ssh *);-
53-
54int-
55kexecdh_client(struct ssh *ssh)-
56{-
57 struct kex *kex = ssh->kex;-
58 EC_KEY *client_key = NULL;-
59 const EC_GROUP *group;-
60 const EC_POINT *public_key;-
61 int r;-
62-
63 if ((client_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL) {
(client_key = ...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
64 r = SSH_ERR_ALLOC_FAIL;-
65 goto out;
never executed: goto out;
0
66 }-
67 if (EC_KEY_generate_key(client_key) != 1) {
EC_KEY_generat...ient_key) != 1Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
68 r = SSH_ERR_LIBCRYPTO_ERROR;-
69 goto out;
never executed: goto out;
0
70 }-
71 group = EC_KEY_get0_group(client_key);-
72 public_key = EC_KEY_get0_public_key(client_key);-
73-
74 if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_INIT)) != 0 ||
(r = sshpkt_st...ssh, 30)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
75 (r = sshpkt_put_ec(ssh, public_key, group)) != 0 ||
(r = sshpkt_pu..., group)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
76 (r = sshpkt_send(ssh)) != 0)
(r = sshpkt_send(ssh)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
77 goto out;
never executed: goto out;
0
78 debug("sending SSH2_MSG_KEX_ECDH_INIT");-
79-
80#ifdef DEBUG_KEXECDH-
81 fputs("client private key:\n", stderr);-
82 sshkey_dump_ec_key(client_key);-
83#endif-
84 kex->ec_client_key = client_key;-
85 kex->ec_group = group;-
86 client_key = NULL; /* owned by the kex */-
87-
88 debug("expecting SSH2_MSG_KEX_ECDH_REPLY");-
89 ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_REPLY, &input_kex_ecdh_reply);-
90 r = 0;-
91 out:
code before this statement executed 60 times by 1 test: out:
Executed by:
  • test_kex
60
92 EC_KEY_free(client_key);-
93 return r;
executed 60 times by 1 test: return r;
Executed by:
  • test_kex
60
94}-
95-
96static int-
97input_kex_ecdh_reply(int type, u_int32_t seq, struct ssh *ssh)-
98{-
99 struct kex *kex = ssh->kex;-
100 const EC_GROUP *group;-
101 EC_POINT *server_public = NULL;-
102 EC_KEY *client_key;-
103 BIGNUM *shared_secret = NULL;-
104 struct sshkey *server_host_key = NULL;-
105 u_char *server_host_key_blob = NULL, *signature = NULL;-
106 u_char *kbuf = NULL;-
107 u_char hash[SSH_DIGEST_MAX_LENGTH];-
108 size_t slen, sbloblen;-
109 size_t klen = 0, hashlen;-
110 int r;-
111-
112 if (kex->verify_host_key == NULL) {
kex->verify_ho...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
113 r = SSH_ERR_INVALID_ARGUMENT;-
114 goto out;
never executed: goto out;
0
115 }-
116 group = kex->ec_group;-
117 client_key = kex->ec_client_key;-
118-
119 /* hostkey */-
120 if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
(r = sshpkt_ge...bloblen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
121 &sbloblen)) != 0 ||
(r = sshpkt_ge...bloblen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
122 (r = sshkey_from_blob(server_host_key_blob, sbloblen,
(r = sshkey_fr...ost_key)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
123 &server_host_key)) != 0)
(r = sshkey_fr...ost_key)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
124 goto out;
never executed: goto out;
0
125 if (server_host_key->type != kex->hostkey_type ||
server_host_ke...->hostkey_typeDescription
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
126 (kex->hostkey_type == KEY_ECDSA &&
kex->hostkey_type == KEY_ECDSADescription
TRUEevaluated 15 times by 1 test
Evaluated by:
  • test_kex
FALSEevaluated 45 times by 1 test
Evaluated by:
  • test_kex
15-45
127 server_host_key->ecdsa_nid != kex->hostkey_nid)) {
server_host_ke...x->hostkey_nidDescription
TRUEnever evaluated
FALSEevaluated 15 times by 1 test
Evaluated by:
  • test_kex
0-15
128 r = SSH_ERR_KEY_TYPE_MISMATCH;-
129 goto out;
never executed: goto out;
0
130 }-
131 if (kex->verify_host_key(server_host_key, ssh) == -1) {
kex->verify_ho...ey, ssh) == -1Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
132 r = SSH_ERR_SIGNATURE_INVALID;-
133 goto out;
never executed: goto out;
0
134 }-
135-
136 /* Q_S, server public key */-
137 /* signed H */-
138 if ((server_public = EC_POINT_new(group)) == NULL) {
(server_public...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
139 r = SSH_ERR_ALLOC_FAIL;-
140 goto out;
never executed: goto out;
0
141 }-
142 if ((r = sshpkt_get_ec(ssh, server_public, group)) != 0 ||
(r = sshpkt_ge..., group)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
143 (r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_ge..., &slen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
144 (r = sshpkt_get_end(ssh)) != 0)
(r = sshpkt_get_end(ssh)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
145 goto out;
never executed: goto out;
0
146-
147#ifdef DEBUG_KEXECDH-
148 fputs("server public key:\n", stderr);-
149 sshkey_dump_ec_point(group, server_public);-
150#endif-
151 if (sshkey_ec_validate_public(group, server_public) != 0) {
sshkey_ec_vali...r_public) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
152 sshpkt_disconnect(ssh, "invalid server public key");-
153 r = SSH_ERR_MESSAGE_INCOMPLETE;-
154 goto out;
never executed: goto out;
0
155 }-
156-
157 klen = (EC_GROUP_get_degree(group) + 7) / 8;-
158 if ((kbuf = malloc(klen)) == NULL ||
(kbuf = malloc...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
159 (shared_secret = BN_new()) == NULL) {
(shared_secret...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
160 r = SSH_ERR_ALLOC_FAIL;-
161 goto out;
never executed: goto out;
0
162 }-
163 if (ECDH_compute_key(kbuf, klen, server_public,
ECDH_compute_k...) != (int)klenDescription
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
164 client_key, NULL) != (int)klen ||
ECDH_compute_k...) != (int)klenDescription
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
165 BN_bin2bn(kbuf, klen, shared_secret) == NULL) {
BN_bin2bn(kbuf...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
166 r = SSH_ERR_LIBCRYPTO_ERROR;-
167 goto out;
never executed: goto out;
0
168 }-
169-
170#ifdef DEBUG_KEXECDH-
171 dump_digest("shared secret", kbuf, klen);-
172#endif-
173 /* calc and verify H */-
174 hashlen = sizeof(hash);-
175 if ((r = kex_ecdh_hash(
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
176 kex->hash_alg,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
177 group,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
178 kex->client_version_string,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
179 kex->server_version_string,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
180 sshbuf_ptr(kex->my), sshbuf_len(kex->my),
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
181 sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
182 server_host_key_blob, sbloblen,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
183 EC_KEY_get0_public_key(client_key),
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
184 server_public,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
185 shared_secret,
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
186 hash, &hashlen)) != 0)
(r = kex_ecdh_...hashlen)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
187 goto out;
never executed: goto out;
0
188-
189 if ((r = sshkey_verify(server_host_key, signature, slen, hash,
(r = sshkey_ve...>compat)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
190 hashlen, kex->hostkey_alg, ssh->compat)) != 0)
(r = sshkey_ve...>compat)) != 0Description
TRUEnever evaluated
FALSEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
0-60
191 goto out;
never executed: goto out;
0
192-
193 /* save session id */-
194 if (kex->session_id == NULL) {
kex->session_id == ((void *)0)Description
TRUEevaluated 12 times by 1 test
Evaluated by:
  • test_kex
FALSEevaluated 48 times by 1 test
Evaluated by:
  • test_kex
12-48
195 kex->session_id_len = hashlen;-
196 kex->session_id = malloc(kex->session_id_len);-
197 if (kex->session_id == NULL) {
kex->session_id == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 12 times by 1 test
Evaluated by:
  • test_kex
0-12
198 r = SSH_ERR_ALLOC_FAIL;-
199 goto out;
never executed: goto out;
0
200 }-
201 memcpy(kex->session_id, hash, kex->session_id_len);-
202 }
executed 12 times by 1 test: end of block
Executed by:
  • test_kex
12
203-
204 if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0)
(r = kex_deriv..._secret)) == 0Description
TRUEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
FALSEnever evaluated
0-60
205 r = kex_send_newkeys(ssh);
executed 60 times by 1 test: r = kex_send_newkeys(ssh);
Executed by:
  • test_kex
60
206 out:
code before this statement executed 60 times by 1 test: out:
Executed by:
  • test_kex
60
207 explicit_bzero(hash, sizeof(hash));-
208 EC_KEY_free(kex->ec_client_key);-
209 kex->ec_client_key = NULL;-
210 EC_POINT_clear_free(server_public);-
211 if (kbuf) {
kbufDescription
TRUEevaluated 60 times by 1 test
Evaluated by:
  • test_kex
FALSEnever evaluated
0-60
212 explicit_bzero(kbuf, klen);-
213 free(kbuf);-
214 }
executed 60 times by 1 test: end of block
Executed by:
  • test_kex
60
215 BN_clear_free(shared_secret);-
216 sshkey_free(server_host_key);-
217 free(server_host_key_blob);-
218 free(signature);-
219 return r;
executed 60 times by 1 test: return r;
Executed by:
  • test_kex
60
220}-
221#endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */-
222-
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