1 /* $OpenBSD: compat.c,v 1.79 2011/09/23 07:45:05 markus Exp $ */
4 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
29 #include <sys/types.h>
49 debug("Enabling compatibility mode for protocol 2.0");
55 debug("Enabling compatibility mode for protocol 1.3");
58 /* datafellows bug compatibility */
60 compat_datafellows(const char *version)
70 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
71 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
72 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
73 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
74 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
75 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
76 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
77 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
78 SSH_OLD_FORWARD_ADDR},
81 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
82 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
83 SSH_OLD_FORWARD_ADDR},
86 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
87 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
88 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
89 SSH_OLD_FORWARD_ADDR},
92 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
93 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
94 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
96 { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
97 { "OpenSSH*", SSH_NEW_OPENSSH },
99 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
100 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
101 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
103 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
104 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
105 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
113 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
114 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
115 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
116 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
117 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
118 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
120 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
121 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
122 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
123 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
124 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
125 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
126 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
127 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
128 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
129 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
130 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
131 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
134 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
135 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
136 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
138 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
139 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
141 { "3.0.*", SSH_BUG_DEBUG },
142 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
143 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
148 "1.2.22*", SSH_BUG_IGNOREMSG },
149 { "1.3.2*", /* F-Secure */
151 { "*SSH Compatible Server*", /* Netscreen */
152 SSH_BUG_PASSWORDPAD },
161 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
162 { "*SSH_Version_Mapper*",
169 /* process table, return first match */
170 for (i = 0; check[i].pat; i++) {
171 if (match_pattern_list(version, check[i].pat,
172 strlen(check[i].pat), 0) == 1) {
173 debug("match: %s pat %s", version, check[i].pat);
174 datafellows = check[i].bugs;
176 * Check to see if the remote side is OpenSSH and not
177 * HPN. It is utterly strange to check it from the
178 * version string and expose the option that way.
180 if (strstr(version,"OpenSSH") != NULL &&
181 strstr(version,"hpn") == NULL) {
182 datafellows |= SSH_BUG_LARGEWINDOW;
183 debug("Remote is not HPN-aware");
188 debug("no match: %s", version);
193 proto_spec(const char *spec)
196 int ret = SSH_PROTO_UNKNOWN;
200 q = s = xstrdup(spec);
201 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
204 if (ret == SSH_PROTO_UNKNOWN)
205 ret |= SSH_PROTO_1_PREFERRED;
212 logit("ignoring bad proto spec: '%s'.", p);
221 compat_cipher_proposal(char *cipher_prop)
224 char *orig_prop, *fix_ciphers;
227 if (!(datafellows & SSH_BUG_BIGENDIANAES))
231 tmp = orig_prop = xstrdup(cipher_prop);
232 while ((cp = strsep(&tmp, ",")) != NULL) {
233 if (strncmp(cp, "aes", 3) != 0) {
234 if (buffer_len(&b) > 0)
235 buffer_append(&b, ",", 1);
236 buffer_append(&b, cp, strlen(cp));
239 buffer_append(&b, "\0", 1);
240 fix_ciphers = xstrdup(buffer_ptr(&b));
243 debug2("Original cipher proposal: %s", cipher_prop);
244 debug2("Compat cipher proposal: %s", fix_ciphers);
246 fatal("No available ciphers found.");