1 /* $OpenBSD: compat.c,v 1.113 2018/08/13 02:41:05 djm Exp $ */
3 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/types.h>
43 /* datafellows bug compatibility */
45 compat_datafellows(const char *version)
54 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR|
56 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR|SSH_BUG_SIGTYPE },
57 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
61 "OpenSSH_4*", SSH_BUG_SIGTYPE },
62 { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT|
64 { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
66 "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD|
75 "OpenSSH_7.7*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
76 { "OpenSSH*", SSH_NEW_OPENSSH },
78 { "3.0.*", SSH_BUG_DEBUG },
79 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
80 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
85 "1.2.22*", SSH_BUG_IGNOREMSG },
86 { "1.3.2*", /* F-Secure */
88 { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
90 { "*SSH Compatible Server*", /* Netscreen */
91 SSH_BUG_PASSWORDPAD },
100 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
101 { "*SSH_Version_Mapper*",
103 { "PuTTY_Local:*," /* dev versions < Sep 2014 */
104 "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
105 "PuTTY_Release_0.5*," /* 0.58-0.59 */
106 "PuTTY_Release_0.60*,"
107 "PuTTY_Release_0.61*,"
108 "PuTTY_Release_0.62*,"
109 "PuTTY_Release_0.63*,"
110 "PuTTY_Release_0.64*",
112 { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
125 "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
126 { "WinSCP_release_4*,"
127 "WinSCP_release_5.0*,"
128 "WinSCP_release_5.1,"
129 "WinSCP_release_5.1.*,"
130 "WinSCP_release_5.5,"
131 "WinSCP_release_5.5.*,"
132 "WinSCP_release_5.6,"
133 "WinSCP_release_5.6.*,"
134 "WinSCP_release_5.7,"
135 "WinSCP_release_5.7.1,"
136 "WinSCP_release_5.7.2,"
137 "WinSCP_release_5.7.3,"
138 "WinSCP_release_5.7.4",
141 SSH_BUG_UTF8TTYMODE },
143 { "Twisted*", SSH_BUG_DEBUG },
147 /* process table, return first match */
148 for (i = 0; check[i].pat; i++) {
149 if (match_pattern_list(version, check[i].pat, 0) == 1) {
150 debug("match: %s pat %s compat 0x%08x",
151 version, check[i].pat, check[i].bugs);
152 datafellows = check[i].bugs; /* XXX for now */
153 return check[i].bugs;
156 debug("no match: %s", version);
162 proto_spec(const char *spec)
165 int ret = SSH_PROTO_UNKNOWN;
169 q = s = strdup(spec);
172 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
178 logit("ignoring bad proto spec: '%s'.", p);
187 compat_cipher_proposal(char *cipher_prop)
189 if (!(datafellows & SSH_BUG_BIGENDIANAES))
191 debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
192 if ((cipher_prop = match_filter_blacklist(cipher_prop, "aes*")) == NULL)
193 fatal("match_filter_blacklist failed");
194 debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
195 if (*cipher_prop == '\0')
196 fatal("No supported ciphers found");
201 compat_pkalg_proposal(char *pkalg_prop)
203 if (!(datafellows & SSH_BUG_RSASIGMD5))
205 debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
206 if ((pkalg_prop = match_filter_blacklist(pkalg_prop, "ssh-rsa")) == NULL)
207 fatal("match_filter_blacklist failed");
208 debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
209 if (*pkalg_prop == '\0')
210 fatal("No supported PK algorithms found");
215 compat_kex_proposal(char *p)
217 if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
219 debug2("%s: original KEX proposal: %s", __func__, p);
220 if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
221 if ((p = match_filter_blacklist(p,
222 "curve25519-sha256@libssh.org")) == NULL)
223 fatal("match_filter_blacklist failed");
224 if ((datafellows & SSH_OLD_DHGEX) != 0) {
225 if ((p = match_filter_blacklist(p,
226 "diffie-hellman-group-exchange-sha256,"
227 "diffie-hellman-group-exchange-sha1")) == NULL)
228 fatal("match_filter_blacklist failed");
230 debug2("%s: compat KEX proposal: %s", __func__, p);
232 fatal("No supported key exchange algorithms found");