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 1.65 2002/09/27 10:42:09 mickey Exp $");
27 RCSID("$FreeBSD: src/crypto/openssh/compat.c,v 1.1.1.1.2.7 2003/02/03 17:31:06 des Exp $");
28 RCSID("$DragonFly: src/crypto/openssh/Attic/compat.c,v 1.2 2003/06/17 04:24:36 dillon Exp $");
44 debug("Enabling compatibility mode for protocol 2.0");
50 debug("Enabling compatibility mode for protocol 1.3");
53 /* datafellows bug compatibility */
55 compat_datafellows(const char *version)
65 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
66 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
68 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
69 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
71 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
72 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
75 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
76 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
79 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
81 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
84 "OpenSSH_3.1*", SSH_BUG_EXTEOF},
85 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
88 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
89 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
90 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
91 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
92 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
93 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|
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|
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 },
120 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
122 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
123 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
124 { "2.*", SSH_BUG_DEBUG },
125 { "3.0.*", SSH_BUG_DEBUG },
126 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
127 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
132 "1.2.22*", SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
133 { "1.3.2*", /* F-Secure */
134 SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
137 "1.2.3*", SSH_BUG_K5USER },
138 { "*SSH Compatible Server*", /* Netscreen */
139 SSH_BUG_PASSWORDPAD },
148 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
149 { "*SSH_Version_Mapper*",
156 /* process table, return first match */
157 for (i = 0; check[i].pat; i++) {
158 if (match_pattern_list(version, check[i].pat,
159 strlen(check[i].pat), 0) == 1) {
160 debug("match: %s pat %s", version, check[i].pat);
161 datafellows = check[i].bugs;
165 debug("no match: %s", version);
170 proto_spec(const char *spec)
173 int ret = SSH_PROTO_UNKNOWN;
177 q = s = xstrdup(spec);
178 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
181 if (ret == SSH_PROTO_UNKNOWN)
182 ret |= SSH_PROTO_1_PREFERRED;
189 log("ignoring bad proto spec: '%s'.", p);
198 compat_cipher_proposal(char *cipher_prop)
201 char *orig_prop, *fix_ciphers;
204 if (!(datafellows & SSH_BUG_BIGENDIANAES))
208 tmp = orig_prop = xstrdup(cipher_prop);
209 while ((cp = strsep(&tmp, ",")) != NULL) {
210 if (strncmp(cp, "aes", 3) != 0) {
211 if (buffer_len(&b) > 0)
212 buffer_append(&b, ",", 1);
213 buffer_append(&b, cp, strlen(cp));
216 buffer_append(&b, "\0", 1);
217 fix_ciphers = xstrdup(buffer_ptr(&b));
220 debug2("Original cipher proposal: %s", cipher_prop);
221 debug2("Compat cipher proposal: %s", fix_ciphers);
223 fatal("No available ciphers found.");