2 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 RCSID("$OpenBSD: compat.c,v 1.70 2003/11/02 11:01:03 markus Exp $");
42 debug("Enabling compatibility mode for protocol 2.0");
48 debug("Enabling compatibility mode for protocol 1.3");
51 /* datafellows bug compatibility */
53 compat_datafellows(const char *version)
63 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
64 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
66 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
67 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
69 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
70 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
73 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
74 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
77 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
79 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
82 "OpenSSH_3.1*", SSH_BUG_EXTEOF},
83 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
86 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
87 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
88 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
90 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
91 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
92 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
100 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
101 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
102 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
103 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
104 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
105 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
107 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
108 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
109 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
110 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
111 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
112 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
113 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
114 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
115 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
116 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
117 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
118 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
121 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
122 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
123 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
125 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
126 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
127 { "3.0.*", SSH_BUG_DEBUG },
128 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
129 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
134 "1.2.22*", SSH_BUG_IGNOREMSG },
135 { "1.3.2*", /* F-Secure */
137 { "*SSH Compatible Server*", /* Netscreen */
138 SSH_BUG_PASSWORDPAD },
147 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
148 { "*SSH_Version_Mapper*",
155 /* process table, return first match */
156 for (i = 0; check[i].pat; i++) {
157 if (match_pattern_list(version, check[i].pat,
158 strlen(check[i].pat), 0) == 1) {
159 debug("match: %s pat %s", version, check[i].pat);
160 datafellows = check[i].bugs;
164 debug("no match: %s", version);
169 proto_spec(const char *spec)
172 int ret = SSH_PROTO_UNKNOWN;
176 q = s = xstrdup(spec);
177 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
180 if (ret == SSH_PROTO_UNKNOWN)
181 ret |= SSH_PROTO_1_PREFERRED;
188 logit("ignoring bad proto spec: '%s'.", p);
197 compat_cipher_proposal(char *cipher_prop)
200 char *orig_prop, *fix_ciphers;
203 if (!(datafellows & SSH_BUG_BIGENDIANAES))
207 tmp = orig_prop = xstrdup(cipher_prop);
208 while ((cp = strsep(&tmp, ",")) != NULL) {
209 if (strncmp(cp, "aes", 3) != 0) {
210 if (buffer_len(&b) > 0)
211 buffer_append(&b, ",", 1);
212 buffer_append(&b, cp, strlen(cp));
215 buffer_append(&b, "\0", 1);
216 fix_ciphers = xstrdup(buffer_ptr(&b));
219 debug2("Original cipher proposal: %s", cipher_prop);
220 debug2("Compat cipher proposal: %s", fix_ciphers);
222 fatal("No available ciphers found.");