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-rw-r--r--kexc25519c.c169
1 files changed, 0 insertions, 169 deletions
diff --git a/kexc25519c.c b/kexc25519c.c
deleted file mode 100644
index a8d92149c..000000000
--- a/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 ||
61 (r = sshpkt_put_string(ssh, kex->c25519_client_pubkey,
62 sizeof(kex->c25519_client_pubkey))) != 0 ||
63 (r = sshpkt_send(ssh)) != 0)
64 return r;
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;
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) {
84 r = SSH_ERR_INVALID_ARGUMENT;
85 goto out;
86 }
87
88 /* hostkey */
89 if ((r = sshpkt_get_string(ssh, &server_host_key_blob,
90 &sbloblen)) != 0 ||
91 (r = sshkey_from_blob(server_host_key_blob, sbloblen,
92 &server_host_key)) != 0)
93 goto out;
94 if (server_host_key->type != kex->hostkey_type ||
95 (kex->hostkey_type == KEY_ECDSA &&
96 server_host_key->ecdsa_nid != kex->hostkey_nid)) {
97 r = SSH_ERR_KEY_TYPE_MISMATCH;
98 goto out;
99 }
100 if (kex->verify_host_key(server_host_key, ssh) == -1) {
101 r = SSH_ERR_SIGNATURE_INVALID;
102 goto out;
103 }
104
105 /* Q_S, server public key */
106 /* signed H */
107 if ((r = sshpkt_get_string(ssh, &server_pubkey, &pklen)) != 0 ||
108 (r = sshpkt_get_string(ssh, &signature, &slen)) != 0 ||
109 (r = sshpkt_get_end(ssh)) != 0)
110 goto out;
111 if (pklen != CURVE25519_SIZE) {
112 r = SSH_ERR_SIGNATURE_INVALID;
113 goto out;
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) {
121 r = SSH_ERR_ALLOC_FAIL;
122 goto out;
123 }
124 if ((r = kexc25519_shared_key(kex->c25519_client_key, server_pubkey,
125 shared_secret)) < 0)
126 goto out;
127
128 /* calc and verify H */
129 hashlen = sizeof(hash);
130 if ((r = kex_c25519_hash(
131 kex->hash_alg,
132 kex->client_version_string,
133 kex->server_version_string,
134 sshbuf_ptr(kex->my), sshbuf_len(kex->my),
135 sshbuf_ptr(kex->peer), sshbuf_len(kex->peer),
136 server_host_key_blob, sbloblen,
137 kex->c25519_client_pubkey,
138 server_pubkey,
139 sshbuf_ptr(shared_secret), sshbuf_len(shared_secret),
140 hash, &hashlen)) < 0)
141 goto out;
142
143 if ((r = sshkey_verify(server_host_key, signature, slen, hash, hashlen,
144 kex->hostkey_alg, ssh->compat)) != 0)
145 goto out;
146
147 /* save session id */
148 if (kex->session_id == NULL) {
149 kex->session_id_len = hashlen;
150 kex->session_id = malloc(kex->session_id_len);
151 if (kex->session_id == NULL) {
152 r = SSH_ERR_ALLOC_FAIL;
153 goto out;
154 }
155 memcpy(kex->session_id, hash, kex->session_id_len);
156 }
157
158 if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0)
159 r = kex_send_newkeys(ssh);
160out:
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;
169}
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