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 1.66 2003/04/01 10:31:26 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|
78 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
80 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
81 { "OpenSSH_2.9p*", SSH_OLD_GSSAPI },
84 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_BUG_GSS_EMPTYUSER|
90 "OpenSSH_3.6.1*", SSH_BUG_GSSAPI_BER},
91 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
94 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
95 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
96 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
98 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
99 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
100 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
108 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
109 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
110 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
111 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
112 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
113 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
115 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
116 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
117 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
118 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
119 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
120 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
121 { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
122 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
123 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
124 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
125 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
126 SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
129 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
130 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
131 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
133 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
134 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX },
135 { "3.0.*", SSH_BUG_DEBUG },
136 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
137 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
142 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
143 { "1.3.2*", /* F-Secure */
144 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
147 "1.2.3*", SSH_BUG_K5USER },
148 { "*SSH Compatible Server*", /* Netscreen */
149 SSH_BUG_PASSWORDPAD },
158 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
159 { "*SSH_Version_Mapper*",
166 /* process table, return first match */
167 for (i = 0; check[i].pat; i++) {
168 if (match_pattern_list(version, check[i].pat,
169 strlen(check[i].pat), 0) == 1) {
170 debug("match: %s pat %s", version, check[i].pat);
171 datafellows = check[i].bugs;
175 debug("no match: %s", version);
180 proto_spec(const char *spec)
183 int ret = SSH_PROTO_UNKNOWN;
187 q = s = xstrdup(spec);
188 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
191 if (ret == SSH_PROTO_UNKNOWN)
192 ret |= SSH_PROTO_1_PREFERRED;
199 log("ignoring bad proto spec: '%s'.", p);
208 compat_cipher_proposal(char *cipher_prop)
211 char *orig_prop, *fix_ciphers;
214 if (!(datafellows & SSH_BUG_BIGENDIANAES))
218 tmp = orig_prop = xstrdup(cipher_prop);
219 while ((cp = strsep(&tmp, ",")) != NULL) {
220 if (strncmp(cp, "aes", 3) != 0) {
221 if (buffer_len(&b) > 0)
222 buffer_append(&b, ",", 1);
223 buffer_append(&b, cp, strlen(cp));
226 buffer_append(&b, "\0", 1);
227 fix_ciphers = xstrdup(buffer_ptr(&b));
230 debug2("Original cipher proposal: %s", cipher_prop);
231 debug2("Compat cipher proposal: %s", fix_ciphers);
233 fatal("No available ciphers found.");