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dtucker@openbsd.org85701772018-02-16 04:43:11 +00001/* $OpenBSD: compat.c,v 1.106 2018/02/16 04:43:11 dtucker Exp $ */
Damien Miller5428f641999-11-25 11:54:57 +11002/*
Damien Miller4e431d42002-03-07 12:59:02 +11003 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Miller5428f641999-11-25 11:54:57 +11004 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
Damien Miller5428f641999-11-25 11:54:57 +110013 *
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.
24 */
25
Damien Millerd4a8b7e1999-10-27 13:42:43 +100026#include "includes.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
Damien Millerd7834352006-08-05 12:39:39 +100028#include <sys/types.h>
29
Damien Millere7a1e5c2006-08-05 11:34:19 +100030#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100031#include <string.h>
Damien Millerd7834352006-08-05 12:39:39 +100032#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100033
Damien Millerd7834352006-08-05 12:39:39 +100034#include "xmalloc.h"
Damien Miller0e3b8722002-01-22 23:26:38 +110035#include "buffer.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000036#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000037#include "compat.h"
38#include "log.h"
Ben Lindstrom9eab2622001-12-06 18:06:05 +000039#include "match.h"
djm@openbsd.org68bc8cf2017-02-03 23:01:19 +000040#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000041
Damien Miller33b13562000-04-04 14:38:59 +100042int datafellows = 0;
Damien Miller95def091999-11-25 00:26:21 +110043
Damien Miller33b13562000-04-04 14:38:59 +100044/* datafellows bug compatibility */
markus@openbsd.org48b3b2b2015-01-19 20:20:20 +000045u_int
Damien Miller33b13562000-04-04 14:38:59 +100046compat_datafellows(const char *version)
47{
Ben Lindstrom9eab2622001-12-06 18:06:05 +000048 int i;
Damien Miller874d77b2000-10-14 16:23:11 +110049 static struct {
50 char *pat;
Damien Miller30c3d422000-05-09 11:02:59 +100051 int bugs;
52 } check[] = {
Ben Lindstromcf159442002-03-26 03:26:24 +000053 { "OpenSSH_2.*,"
54 "OpenSSH_3.0*,"
Damien Millerf91ee4c2005-03-01 21:24:33 +110055 "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
56 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
Ben Lindstromcf159442002-03-26 03:26:24 +000057 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
djm@openbsd.org14b5c632018-01-23 05:27:21 +000058 { "OpenSSH_2*,"
59 "OpenSSH_3*,"
60 "OpenSSH_4*", 0 },
Darren Tucker68afb8c2011-10-02 18:59:03 +110061 { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
Damien Millerb628cc42014-04-20 13:33:58 +100062 { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH},
Damien Miller9395b282014-04-20 13:25:30 +100063 { "OpenSSH_6.5*,"
Damien Miller0e6b6742014-04-20 13:27:01 +100064 "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD},
Damien Miller456e6f02008-11-03 19:20:10 +110065 { "OpenSSH*", SSH_NEW_OPENSSH },
Ben Lindstrom9eab2622001-12-06 18:06:05 +000066 { "*MindTerm*", 0 },
Ben Lindstrom9eab2622001-12-06 18:06:05 +000067 { "3.0.*", SSH_BUG_DEBUG },
68 { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
69 { "1.7 SecureFX*", SSH_OLD_SESSIONID },
70 { "1.2.18*,"
71 "1.2.19*,"
72 "1.2.20*,"
73 "1.2.21*,"
Damien Miller7630ee22003-09-02 22:52:00 +100074 "1.2.22*", SSH_BUG_IGNOREMSG },
Ben Lindstromc8226382002-04-10 16:22:09 +000075 { "1.3.2*", /* F-Secure */
Damien Miller7630ee22003-09-02 22:52:00 +100076 SSH_BUG_IGNOREMSG },
djm@openbsd.orgb6ea0e52015-07-28 23:20:42 +000077 { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
78 SSH_BUG_HOSTKEYS },
Ben Lindstrom9eab2622001-12-06 18:06:05 +000079 { "*SSH Compatible Server*", /* Netscreen */
Ben Lindstromd20d0f32001-03-10 17:22:20 +000080 SSH_BUG_PASSWORDPAD },
Damien Miller9f0f5c62001-12-21 14:45:46 +110081 { "*OSU_0*,"
Ben Lindstrom9eab2622001-12-06 18:06:05 +000082 "OSU_1.0*,"
83 "OSU_1.1*,"
84 "OSU_1.2*,"
85 "OSU_1.3*,"
86 "OSU_1.4*,"
87 "OSU_1.5alpha1*,"
88 "OSU_1.5alpha2*,"
89 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
90 { "*SSH_Version_Mapper*",
Damien Miller27dbe6f2001-03-19 22:36:20 +110091 SSH_BUG_SCANNER },
dtucker@openbsd.orgb1dc2b32015-07-13 04:57:14 +000092 { "PuTTY_Local:*," /* dev versions < Sep 2014 */
93 "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
dtucker@openbsd.orgea139502015-05-06 04:07:18 +000094 "PuTTY_Release_0.5*," /* 0.58-0.59 */
95 "PuTTY_Release_0.60*,"
96 "PuTTY_Release_0.61*,"
97 "PuTTY_Release_0.62*,"
98 "PuTTY_Release_0.63*,"
99 "PuTTY_Release_0.64*",
100 SSH_OLD_DHGEX },
djm@openbsd.org8543d4e2015-08-19 23:21:42 +0000101 { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
Damien Millere9264972002-09-30 11:59:21 +1000102 { "Probe-*",
103 SSH_BUG_PROBE },
dtucker@openbsd.orgd8f391c2015-04-10 05:16:50 +0000104 { "TeraTerm SSH*,"
105 "TTSSH/1.5.*,"
106 "TTSSH/2.1*,"
107 "TTSSH/2.2*,"
108 "TTSSH/2.3*,"
109 "TTSSH/2.4*,"
110 "TTSSH/2.5*,"
111 "TTSSH/2.6*,"
112 "TTSSH/2.70*,"
113 "TTSSH/2.71*,"
114 "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
djm@openbsd.org8543d4e2015-08-19 23:21:42 +0000115 { "WinSCP_release_4*,"
116 "WinSCP_release_5.0*,"
dtucker@openbsd.org2985d402017-07-25 09:22:25 +0000117 "WinSCP_release_5.1,"
118 "WinSCP_release_5.1.*,"
119 "WinSCP_release_5.5,"
120 "WinSCP_release_5.5.*,"
121 "WinSCP_release_5.6,"
122 "WinSCP_release_5.6.*,"
djm@openbsd.org8543d4e2015-08-19 23:21:42 +0000123 "WinSCP_release_5.7,"
124 "WinSCP_release_5.7.1,"
125 "WinSCP_release_5.7.2,"
126 "WinSCP_release_5.7.3,"
127 "WinSCP_release_5.7.4",
128 SSH_OLD_DHGEX },
dtucker@openbsd.org85701772018-02-16 04:43:11 +0000129 { "ConfD-*",
130 SSH_BUG_UTF8TTYMODE },
Damien Miller50a41ed2000-10-16 12:14:42 +1100131 { NULL, 0 }
Damien Miller33b13562000-04-04 14:38:59 +1000132 };
Ben Lindstrom9eab2622001-12-06 18:06:05 +0000133
Damien Millercaf6dd62000-08-29 11:33:50 +1100134 /* process table, return first match */
Damien Miller874d77b2000-10-14 16:23:11 +1100135 for (i = 0; check[i].pat; i++) {
djm@openbsd.orge661a862015-05-04 06:10:48 +0000136 if (match_pattern_list(version, check[i].pat, 0) == 1) {
Damien Miller324541e2013-12-31 12:25:40 +1100137 debug("match: %s pat %s compat 0x%08x",
markus@openbsd.org48b3b2b2015-01-19 20:20:20 +0000138 version, check[i].pat, check[i].bugs);
139 datafellows = check[i].bugs; /* XXX for now */
140 return check[i].bugs;
Damien Miller33b13562000-04-04 14:38:59 +1000141 }
142 }
Damien Miller874d77b2000-10-14 16:23:11 +1100143 debug("no match: %s", version);
markus@openbsd.org48b3b2b2015-01-19 20:20:20 +0000144 return 0;
Damien Miller33b13562000-04-04 14:38:59 +1000145}
Damien Miller78928792000-04-12 20:17:38 +1000146
147#define SEP ","
148int
149proto_spec(const char *spec)
150{
Damien Miller37023962000-07-11 17:31:38 +1000151 char *s, *p, *q;
Damien Miller78928792000-04-12 20:17:38 +1000152 int ret = SSH_PROTO_UNKNOWN;
153
Damien Millerb1715dc2000-05-30 13:44:51 +1000154 if (spec == NULL)
155 return ret;
markus@openbsd.org48b3b2b2015-01-19 20:20:20 +0000156 q = s = strdup(spec);
157 if (s == NULL)
158 return ret;
Damien Miller37023962000-07-11 17:31:38 +1000159 for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000160 switch (atoi(p)) {
Damien Miller78928792000-04-12 20:17:38 +1000161 case 2:
162 ret |= SSH_PROTO_2;
163 break;
164 default:
Damien Miller996acd22003-04-09 20:59:48 +1000165 logit("ignoring bad proto spec: '%s'.", p);
Damien Miller78928792000-04-12 20:17:38 +1000166 break;
167 }
168 }
Darren Tuckera627d422013-06-02 07:31:17 +1000169 free(s);
Damien Miller78928792000-04-12 20:17:38 +1000170 return ret;
171}
Ben Lindstromc8530c72001-03-24 00:35:19 +0000172
Damien Miller324541e2013-12-31 12:25:40 +1100173char *
174compat_cipher_proposal(char *cipher_prop)
175{
176 if (!(datafellows & SSH_BUG_BIGENDIANAES))
177 return cipher_prop;
178 debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
djm@openbsd.org68bc8cf2017-02-03 23:01:19 +0000179 if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL)
180 fatal("match_filter_list failed");
Damien Miller324541e2013-12-31 12:25:40 +1100181 debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
182 if (*cipher_prop == '\0')
183 fatal("No supported ciphers found");
184 return cipher_prop;
185}
186
Damien Miller324541e2013-12-31 12:25:40 +1100187char *
188compat_pkalg_proposal(char *pkalg_prop)
189{
190 if (!(datafellows & SSH_BUG_RSASIGMD5))
191 return pkalg_prop;
192 debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
djm@openbsd.org68bc8cf2017-02-03 23:01:19 +0000193 if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL)
194 fatal("match_filter_list failed");
Damien Miller324541e2013-12-31 12:25:40 +1100195 debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
196 if (*pkalg_prop == '\0')
197 fatal("No supported PK algorithms found");
198 return pkalg_prop;
199}
200
Damien Miller9395b282014-04-20 13:25:30 +1000201char *
djm@openbsd.org318be282015-04-13 02:04:08 +0000202compat_kex_proposal(char *p)
Damien Miller9395b282014-04-20 13:25:30 +1000203{
djm@openbsd.org318be282015-04-13 02:04:08 +0000204 if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
205 return p;
206 debug2("%s: original KEX proposal: %s", __func__, p);
207 if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
djm@openbsd.org68bc8cf2017-02-03 23:01:19 +0000208 if ((p = match_filter_list(p,
209 "curve25519-sha256@libssh.org")) == NULL)
210 fatal("match_filter_list failed");
djm@openbsd.org318be282015-04-13 02:04:08 +0000211 if ((datafellows & SSH_OLD_DHGEX) != 0) {
djm@openbsd.org68bc8cf2017-02-03 23:01:19 +0000212 if ((p = match_filter_list(p,
213 "diffie-hellman-group-exchange-sha256,"
214 "diffie-hellman-group-exchange-sha1")) == NULL)
215 fatal("match_filter_list failed");
djm@openbsd.org318be282015-04-13 02:04:08 +0000216 }
217 debug2("%s: compat KEX proposal: %s", __func__, p);
218 if (*p == '\0')
Damien Miller9395b282014-04-20 13:25:30 +1000219 fatal("No supported key exchange algorithms found");
djm@openbsd.org318be282015-04-13 02:04:08 +0000220 return p;
Damien Miller9395b282014-04-20 13:25:30 +1000221}
222