diff options
author | Colin Watson <cjwatson@debian.org> | 2019-06-05 06:41:44 +0100 |
---|---|---|
committer | Colin Watson <cjwatson@debian.org> | 2019-06-09 22:09:07 +0100 |
commit | 865a97e05b6aab1619e1c8eeb33ccb8f9a9e48d3 (patch) | |
tree | 7bb2128eb663180bacfabca88f26d26bf0733824 /kexc25519s.c | |
parent | ba627ba172d6649919baedff5ba2789610da382a (diff) | |
parent | 7d50f9e5be88179325983a1f58c9d51bb58f025a (diff) |
New upstream release (8.0p1)
Diffstat (limited to 'kexc25519s.c')
-rw-r--r-- | kexc25519s.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/kexc25519s.c b/kexc25519s.c deleted file mode 100644 index 0800a7a4b..000000000 --- a/kexc25519s.c +++ /dev/null | |||
@@ -1,158 +0,0 @@ | |||
1 | /* $OpenBSD: kexc25519s.c,v 1.11 2017/05/31 04:19:28 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 | * 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 | #include <sys/types.h> | ||
30 | #include <stdio.h> | ||
31 | #include <string.h> | ||
32 | #include <signal.h> | ||
33 | |||
34 | #include "sshkey.h" | ||
35 | #include "cipher.h" | ||
36 | #include "digest.h" | ||
37 | #include "kex.h" | ||
38 | #include "log.h" | ||
39 | #include "packet.h" | ||
40 | #include "ssh2.h" | ||
41 | #include "sshbuf.h" | ||
42 | #include "ssherr.h" | ||
43 | |||
44 | static int input_kex_c25519_init(int, u_int32_t, struct ssh *); | ||
45 | |||
46 | int | ||
47 | kexc25519_server(struct ssh *ssh) | ||
48 | { | ||
49 | debug("expecting SSH2_MSG_KEX_ECDH_INIT"); | ||
50 | ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_INIT, &input_kex_c25519_init); | ||
51 | return 0; | ||
52 | } | ||
53 | |||
54 | static int | ||
55 | input_kex_c25519_init(int type, u_int32_t seq, struct ssh *ssh) | ||
56 | { | ||
57 | struct kex *kex = ssh->kex; | ||
58 | struct sshkey *server_host_private, *server_host_public; | ||
59 | struct sshbuf *shared_secret = NULL; | ||
60 | u_char *server_host_key_blob = NULL, *signature = NULL; | ||
61 | u_char server_key[CURVE25519_SIZE]; | ||
62 | u_char *client_pubkey = NULL; | ||
63 | u_char server_pubkey[CURVE25519_SIZE]; | ||
64 | u_char hash[SSH_DIGEST_MAX_LENGTH]; | ||
65 | size_t slen, pklen, sbloblen, hashlen; | ||
66 | int r; | ||
67 | |||
68 | /* generate private key */ | ||
69 | kexc25519_keygen(server_key, server_pubkey); | ||
70 | #ifdef DEBUG_KEXECDH | ||
71 | dump_digest("server private key:", server_key, sizeof(server_key)); | ||
72 | #endif | ||
73 | if (kex->load_host_public_key == NULL || | ||
74 | kex->load_host_private_key == NULL) { | ||
75 | r = SSH_ERR_INVALID_ARGUMENT; | ||
76 | goto out; | ||
77 | } | ||
78 | server_host_public = kex->load_host_public_key(kex->hostkey_type, | ||
79 | kex->hostkey_nid, ssh); | ||
80 | server_host_private = kex->load_host_private_key(kex->hostkey_type, | ||
81 | kex->hostkey_nid, ssh); | ||
82 | if (server_host_public == NULL) { | ||
83 | r = SSH_ERR_NO_HOSTKEY_LOADED; | ||
84 | goto out; | ||
85 | } | ||
86 | |||
87 | if ((r = sshpkt_get_string(ssh, &client_pubkey, &pklen)) != 0 || | ||
88 | (r = sshpkt_get_end(ssh)) != 0) | ||
89 | goto out; | ||
90 | if (pklen != CURVE25519_SIZE) { | ||
91 | r = SSH_ERR_SIGNATURE_INVALID; | ||
92 | goto out; | ||
93 | } | ||
94 | #ifdef DEBUG_KEXECDH | ||
95 | dump_digest("client public key:", client_pubkey, CURVE25519_SIZE); | ||
96 | #endif | ||
97 | |||
98 | if ((shared_secret = sshbuf_new()) == NULL) { | ||
99 | r = SSH_ERR_ALLOC_FAIL; | ||
100 | goto out; | ||
101 | } | ||
102 | if ((r = kexc25519_shared_key(server_key, client_pubkey, | ||
103 | shared_secret)) < 0) | ||
104 | goto out; | ||
105 | |||
106 | /* calc H */ | ||
107 | if ((r = sshkey_to_blob(server_host_public, &server_host_key_blob, | ||
108 | &sbloblen)) != 0) | ||
109 | goto out; | ||
110 | hashlen = sizeof(hash); | ||
111 | if ((r = kex_c25519_hash( | ||
112 | kex->hash_alg, | ||
113 | kex->client_version_string, | ||
114 | kex->server_version_string, | ||
115 | sshbuf_ptr(kex->peer), sshbuf_len(kex->peer), | ||
116 | sshbuf_ptr(kex->my), sshbuf_len(kex->my), | ||
117 | server_host_key_blob, sbloblen, | ||
118 | client_pubkey, | ||
119 | server_pubkey, | ||
120 | sshbuf_ptr(shared_secret), sshbuf_len(shared_secret), | ||
121 | hash, &hashlen)) < 0) | ||
122 | goto out; | ||
123 | |||
124 | /* save session id := H */ | ||
125 | if (kex->session_id == NULL) { | ||
126 | kex->session_id_len = hashlen; | ||
127 | kex->session_id = malloc(kex->session_id_len); | ||
128 | if (kex->session_id == NULL) { | ||
129 | r = SSH_ERR_ALLOC_FAIL; | ||
130 | goto out; | ||
131 | } | ||
132 | memcpy(kex->session_id, hash, kex->session_id_len); | ||
133 | } | ||
134 | |||
135 | /* sign H */ | ||
136 | if ((r = kex->sign(server_host_private, server_host_public, &signature, | ||
137 | &slen, hash, hashlen, kex->hostkey_alg, ssh->compat)) < 0) | ||
138 | goto out; | ||
139 | |||
140 | /* send server hostkey, ECDH pubkey 'Q_S' and signed H */ | ||
141 | if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_REPLY)) != 0 || | ||
142 | (r = sshpkt_put_string(ssh, server_host_key_blob, sbloblen)) != 0 || | ||
143 | (r = sshpkt_put_string(ssh, server_pubkey, sizeof(server_pubkey))) != 0 || | ||
144 | (r = sshpkt_put_string(ssh, signature, slen)) != 0 || | ||
145 | (r = sshpkt_send(ssh)) != 0) | ||
146 | goto out; | ||
147 | |||
148 | if ((r = kex_derive_keys(ssh, hash, hashlen, shared_secret)) == 0) | ||
149 | r = kex_send_newkeys(ssh); | ||
150 | out: | ||
151 | explicit_bzero(hash, sizeof(hash)); | ||
152 | explicit_bzero(server_key, sizeof(server_key)); | ||
153 | free(server_host_key_blob); | ||
154 | free(signature); | ||
155 | free(client_pubkey); | ||
156 | sshbuf_free(shared_secret); | ||
157 | return r; | ||
158 | } | ||