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kexc25519c.c

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1/* $OpenBSD: kexc25519c.c,v 1.9 2017/12/18 02:25:15 djm Exp $ */-
2/*-
3 * Copyright (c) 2001 Markus Friedl. All rights reserved.-
4 * Copyright (c) 2010 Damien Miller. All rights reserved.-
5 * Copyright (c) 2013 Aris Adamantiadis. All rights reserved.-
6 *-
7 * Redistribution and use in source and binary forms, with or without-
8 * modification, are permitted provided that the following conditions-
9 * are met:-
10 * 1. Redistributions of source code must retain the above copyright-
11 * notice, this list of conditions and the following disclaimer.-
12 * 2. Redistributions in binary form must reproduce the above copyright-
13 * notice, this list of conditions and the following disclaimer in the-
14 * documentation and/or other materials provided with the distribution.-
15 *-
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR-
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES-
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.-
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,-
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT-
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,-
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY-
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT-
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF-
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.-
26 */-
27-
28#include "includes.h"-
29-
30#include <sys/types.h>-
31-
32#include <stdio.h>-
33#include <string.h>-
34#include <signal.h>-
35-
36#include "sshkey.h"-
37#include "cipher.h"-
38#include "kex.h"-
39#include "log.h"-
40#include "packet.h"-
41#include "ssh2.h"-
42#include "sshbuf.h"-
43#include "digest.h"-
44#include "ssherr.h"-
45-
46static int-
47input_kex_c25519_reply(int type, u_int32_t seq, struct ssh *ssh);-
48-
49int-
50kexc25519_client(struct ssh *ssh)-
51{-
52 struct kex *kex = ssh->kex;-
53 int r;-
54-
55 kexc25519_keygen(kex->c25519_client_key, kex->c25519_client_pubkey);-
56#ifdef DEBUG_KEXECDH-
57 dump_digest("client private key:", kex->c25519_client_key,-
58 sizeof(kex->c25519_client_key));-
59#endif-
60 if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_INIT)) != 0 ||
(r = sshpkt_st...ssh, 30)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
61 (r = sshpkt_put_string(ssh, kex->c25519_client_pubkey,
(r = sshpkt_pu...pubkey))) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
62 sizeof(kex->c25519_client_pubkey))) != 0 ||
(r = sshpkt_pu...pubkey))) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
63 (r = sshpkt_send(ssh)) != 0)
(r = sshpkt_send(ssh)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
64 return r;
never executed: return r;
0
65-
66 debug("expecting SSH2_MSG_KEX_ECDH_REPLY");-
67 ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_REPLY, &input_kex_c25519_reply);-
68 return 0;
executed 20 times by 1 test: return 0;
Executed by:
  • test_kex
20
69}-
70-
71static int-
72input_kex_c25519_reply(int type, u_int32_t seq, struct ssh *ssh)-
73{-
74 struct kex *kex = ssh->kex;-
75 struct sshkey *server_host_key = NULL;-
76 struct sshbuf *shared_secret = NULL;-
77 u_char *server_pubkey = NULL;-
78 u_char *server_host_key_blob = NULL, *signature = NULL;-
79 u_char hash[SSH_DIGEST_MAX_LENGTH];-
80 size_t slen, pklen, sbloblen, hashlen;-
81 int r;-
82-
83 if (kex->verify_host_key == NULL) {
kex->verify_ho...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
84 r = SSH_ERR_INVALID_ARGUMENT;-
85 goto out;
never executed: goto out;
0
86 }-
87-
88 /* hostkey */-
89 if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
(r = sshpkt_ge...bloblen)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
90 &sbloblen)) != 0 ||
(r = sshpkt_ge...bloblen)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
91 (r = sshkey_from_blob(server_host_key_blob, sbloblen,
(r = sshkey_fr...ost_key)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
92 &server_host_key)) != 0)
(r = sshkey_fr...ost_key)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
93 goto out;
never executed: goto out;
0
94 if (server_host_key->type != kex->hostkey_type ||
server_host_ke...->hostkey_typeDescription
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
95 (kex->hostkey_type == KEY_ECDSA &&
kex->hostkey_type == KEY_ECDSADescription
TRUEevaluated 5 times by 1 test
Evaluated by:
  • test_kex
FALSEevaluated 15 times by 1 test
Evaluated by:
  • test_kex
5-15
96 server_host_key->ecdsa_nid != kex->hostkey_nid)) {
server_host_ke...x->hostkey_nidDescription
TRUEnever evaluated
FALSEevaluated 5 times by 1 test
Evaluated by:
  • test_kex
0-5
97 r = SSH_ERR_KEY_TYPE_MISMATCH;-
98 goto out;
never executed: goto out;
0
99 }-
100 if (kex->verify_host_key(server_host_key, ssh) == -1) {
kex->verify_ho...ey, ssh) == -1Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
101 r = SSH_ERR_SIGNATURE_INVALID;-
102 goto out;
never executed: goto out;
0
103 }-
104-
105 /* Q_S, server public key */-
106 /* signed H */-
107 if ((r = sshpkt_get_string(ssh, &server_pubkey, &pklen)) != 0 ||
(r = sshpkt_ge... &pklen)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
108 (r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
(r = sshpkt_ge..., &slen)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
109 (r = sshpkt_get_end(ssh)) != 0)
(r = sshpkt_get_end(ssh)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
110 goto out;
never executed: goto out;
0
111 if (pklen != CURVE25519_SIZE) {
pklen != 32Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
112 r = SSH_ERR_SIGNATURE_INVALID;-
113 goto out;
never executed: goto out;
0
114 }-
115-
116#ifdef DEBUG_KEXECDH-
117 dump_digest("server public key:", server_pubkey, CURVE25519_SIZE);-
118#endif-
119-
120 if ((shared_secret = sshbuf_new()) == NULL) {
(shared_secret...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
121 r = SSH_ERR_ALLOC_FAIL;-
122 goto out;
never executed: goto out;
0
123 }-
124 if ((r = kexc25519_shared_key(kex->c25519_client_key, server_pubkey,
(r = kexc25519...d_secret)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
125 shared_secret)) < 0)
(r = kexc25519...d_secret)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
126 goto out;
never executed: goto out;
0
127-
128 /* calc and verify H */-
129 hashlen = sizeof(hash);-
130 if ((r = kex_c25519_hash(
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
131 kex->hash_alg,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
132 kex->client_version_string,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
133 kex->server_version_string,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
134 sshbuf_ptr(kex->my), sshbuf_len(kex->my),
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
135 sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
136 server_host_key_blob, sbloblen,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
137 kex->c25519_client_pubkey,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
138 server_pubkey,
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
139 sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
140 hash, &hashlen)) < 0)
(r = kex_c2551...&hashlen)) < 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
141 goto out;
never executed: goto out;
0
142-
143 if ((r = sshkey_verify(server_host_key, signature, slen, hash, hashlen,
(r = sshkey_ve...>compat)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
144 kex->hostkey_alg, ssh->compat)) != 0)
(r = sshkey_ve...>compat)) != 0Description
TRUEnever evaluated
FALSEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
0-20
145 goto out;
never executed: goto out;
0
146-
147 /* save session id */-
148 if (kex->session_id == NULL) {
kex->session_id == ((void *)0)Description
TRUEevaluated 4 times by 1 test
Evaluated by:
  • test_kex
FALSEevaluated 16 times by 1 test
Evaluated by:
  • test_kex
4-16
149 kex->session_id_len = hashlen;-
150 kex->session_id = malloc(kex->session_id_len);-
151 if (kex->session_id == NULL) {
kex->session_id == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 4 times by 1 test
Evaluated by:
  • test_kex
0-4
152 r = SSH_ERR_ALLOC_FAIL;-
153 goto out;
never executed: goto out;
0
154 }-
155 memcpy(kex->session_id, hash, kex->session_id_len);-
156 }
executed 4 times by 1 test: end of block
Executed by:
  • test_kex
4
157-
158 if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
(r = kex_deriv..._secret)) == 0Description
TRUEevaluated 20 times by 1 test
Evaluated by:
  • test_kex
FALSEnever evaluated
0-20
159 r = kex_send_newkeys(ssh);
executed 20 times by 1 test: r = kex_send_newkeys(ssh);
Executed by:
  • test_kex
20
160out:
code before this statement executed 20 times by 1 test: out:
Executed by:
  • test_kex
20
161 explicit_bzero(hash, sizeof(hash));-
162 explicit_bzero(kex->c25519_client_key, sizeof(kex->c25519_client_key));-
163 free(server_host_key_blob);-
164 free(server_pubkey);-
165 free(signature);-
166 sshkey_free(server_host_key);-
167 sshbuf_free(shared_secret);-
168 return r;
executed 20 times by 1 test: return r;
Executed by:
  • test_kex
20
169}-
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