1 /* $OpenBSD: compat.c,v 1.104 2017/07/25 09:22:25 dtucker 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>
44 /* datafellows bug compatibility */
46 compat_datafellows(const char *version)
56 "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
57 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
58 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
59 { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
60 SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
61 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
62 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
63 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
64 SSH_OLD_FORWARD_ADDR},
67 SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
68 SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
69 SSH_OLD_FORWARD_ADDR},
72 "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
73 SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
74 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
75 SSH_OLD_FORWARD_ADDR},
78 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
79 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
80 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
82 { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
83 { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH},
85 "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD},
86 { "OpenSSH*", SSH_NEW_OPENSSH },
88 { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
89 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
90 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
92 { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
93 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
94 SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
102 "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
103 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
104 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
105 SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
106 SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
107 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
109 "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
110 SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
111 SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
112 SSH_BUG_PKAUTH|SSH_BUG_PKOK|
113 SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
114 SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
115 { "2.0.*", 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_DERIVEKEY|SSH_BUG_DUMMYCHAN|
123 "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
124 SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
125 { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
127 { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
128 { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
130 { "3.0.*", SSH_BUG_DEBUG },
131 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
132 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
137 "1.2.22*", SSH_BUG_IGNOREMSG },
138 { "1.3.2*", /* F-Secure */
140 { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
142 { "*SSH Compatible Server*", /* Netscreen */
143 SSH_BUG_PASSWORDPAD },
152 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
153 { "*SSH_Version_Mapper*",
155 { "PuTTY_Local:*," /* dev versions < Sep 2014 */
156 "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
157 "PuTTY_Release_0.5*," /* 0.58-0.59 */
158 "PuTTY_Release_0.60*,"
159 "PuTTY_Release_0.61*,"
160 "PuTTY_Release_0.62*,"
161 "PuTTY_Release_0.63*,"
162 "PuTTY_Release_0.64*",
164 { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
177 "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
178 { "WinSCP_release_4*,"
179 "WinSCP_release_5.0*,"
180 "WinSCP_release_5.1,"
181 "WinSCP_release_5.1.*,"
182 "WinSCP_release_5.5,"
183 "WinSCP_release_5.5.*,"
184 "WinSCP_release_5.6,"
185 "WinSCP_release_5.6.*,"
186 "WinSCP_release_5.7,"
187 "WinSCP_release_5.7.1,"
188 "WinSCP_release_5.7.2,"
189 "WinSCP_release_5.7.3,"
190 "WinSCP_release_5.7.4",
195 /* process table, return first match */
196 for (i = 0; check[i].pat; i++) {
197 if (match_pattern_list(version, check[i].pat, 0) == 1) {
198 debug("match: %s pat %s compat 0x%08x",
199 version, check[i].pat, check[i].bugs);
200 datafellows = check[i].bugs; /* XXX for now */
201 return check[i].bugs;
204 debug("no match: %s", version);
210 proto_spec(const char *spec)
213 int ret = SSH_PROTO_UNKNOWN;
217 q = s = strdup(spec);
220 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
226 logit("ignoring bad proto spec: '%s'.", p);
235 compat_cipher_proposal(char *cipher_prop)
237 if (!(datafellows & SSH_BUG_BIGENDIANAES))
239 debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
240 if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL)
241 fatal("match_filter_list failed");
242 debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
243 if (*cipher_prop == '\0')
244 fatal("No supported ciphers found");
249 compat_pkalg_proposal(char *pkalg_prop)
251 if (!(datafellows & SSH_BUG_RSASIGMD5))
253 debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
254 if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL)
255 fatal("match_filter_list failed");
256 debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
257 if (*pkalg_prop == '\0')
258 fatal("No supported PK algorithms found");
263 compat_kex_proposal(char *p)
265 if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
267 debug2("%s: original KEX proposal: %s", __func__, p);
268 if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
269 if ((p = match_filter_list(p,
270 "curve25519-sha256@libssh.org")) == NULL)
271 fatal("match_filter_list failed");
272 if ((datafellows & SSH_OLD_DHGEX) != 0) {
273 if ((p = match_filter_list(p,
274 "diffie-hellman-group-exchange-sha256,"
275 "diffie-hellman-group-exchange-sha1")) == NULL)
276 fatal("match_filter_list failed");
278 debug2("%s: compat KEX proposal: %s", __func__, p);
280 fatal("No supported key exchange algorithms found");