dtucker@openbsd.org | 8570177 | 2018-02-16 04:43:11 +0000 | [diff] [blame] | 1 | /* $OpenBSD: compat.c,v 1.106 2018/02/16 04:43:11 dtucker Exp $ */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2 | /* |
Damien Miller | 4e431d4 | 2002-03-07 12:59:02 +1100 | [diff] [blame] | 3 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4 | * |
| 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 Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 13 | * |
| 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 26 | #include "includes.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 28 | #include <sys/types.h> |
| 29 | |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 30 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 31 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 32 | #include <stdarg.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 33 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 34 | #include "xmalloc.h" |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 35 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 36 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 37 | #include "compat.h" |
| 38 | #include "log.h" |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 39 | #include "match.h" |
djm@openbsd.org | 68bc8cf | 2017-02-03 23:01:19 +0000 | [diff] [blame] | 40 | #include "kex.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 42 | int datafellows = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 43 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 44 | /* datafellows bug compatibility */ |
markus@openbsd.org | 48b3b2b | 2015-01-19 20:20:20 +0000 | [diff] [blame] | 45 | u_int |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 46 | compat_datafellows(const char *version) |
| 47 | { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 48 | int i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 49 | static struct { |
| 50 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 51 | int bugs; |
| 52 | } check[] = { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 53 | { "OpenSSH_2.*," |
| 54 | "OpenSSH_3.0*," |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 55 | "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR}, |
| 56 | { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR }, |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 57 | { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF}, |
djm@openbsd.org | 14b5c63 | 2018-01-23 05:27:21 +0000 | [diff] [blame] | 58 | { "OpenSSH_2*," |
| 59 | "OpenSSH_3*," |
| 60 | "OpenSSH_4*", 0 }, |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 61 | { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT}, |
Damien Miller | b628cc4 | 2014-04-20 13:33:58 +1000 | [diff] [blame] | 62 | { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH}, |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 63 | { "OpenSSH_6.5*," |
Damien Miller | 0e6b674 | 2014-04-20 13:27:01 +1000 | [diff] [blame] | 64 | "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD}, |
Damien Miller | 456e6f0 | 2008-11-03 19:20:10 +1100 | [diff] [blame] | 65 | { "OpenSSH*", SSH_NEW_OPENSSH }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 66 | { "*MindTerm*", 0 }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 67 | { "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 Miller | 7630ee2 | 2003-09-02 22:52:00 +1000 | [diff] [blame] | 74 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
Ben Lindstrom | c822638 | 2002-04-10 16:22:09 +0000 | [diff] [blame] | 75 | { "1.3.2*", /* F-Secure */ |
Damien Miller | 7630ee2 | 2003-09-02 22:52:00 +1000 | [diff] [blame] | 76 | SSH_BUG_IGNOREMSG }, |
djm@openbsd.org | b6ea0e5 | 2015-07-28 23:20:42 +0000 | [diff] [blame] | 77 | { "Cisco-1.*", SSH_BUG_DHGEX_LARGE| |
| 78 | SSH_BUG_HOSTKEYS }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 79 | { "*SSH Compatible Server*", /* Netscreen */ |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 80 | SSH_BUG_PASSWORDPAD }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 81 | { "*OSU_0*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 82 | "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 Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 91 | SSH_BUG_SCANNER }, |
dtucker@openbsd.org | b1dc2b3 | 2015-07-13 04:57:14 +0000 | [diff] [blame] | 92 | { "PuTTY_Local:*," /* dev versions < Sep 2014 */ |
| 93 | "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */ |
dtucker@openbsd.org | ea13950 | 2015-05-06 04:07:18 +0000 | [diff] [blame] | 94 | "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.org | 8543d4e | 2015-08-19 23:21:42 +0000 | [diff] [blame] | 101 | { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */ |
Damien Miller | e926497 | 2002-09-30 11:59:21 +1000 | [diff] [blame] | 102 | { "Probe-*", |
| 103 | SSH_BUG_PROBE }, |
dtucker@openbsd.org | d8f391c | 2015-04-10 05:16:50 +0000 | [diff] [blame] | 104 | { "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.org | 8543d4e | 2015-08-19 23:21:42 +0000 | [diff] [blame] | 115 | { "WinSCP_release_4*," |
| 116 | "WinSCP_release_5.0*," |
dtucker@openbsd.org | 2985d40 | 2017-07-25 09:22:25 +0000 | [diff] [blame] | 117 | "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.org | 8543d4e | 2015-08-19 23:21:42 +0000 | [diff] [blame] | 123 | "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.org | 8570177 | 2018-02-16 04:43:11 +0000 | [diff] [blame] | 129 | { "ConfD-*", |
| 130 | SSH_BUG_UTF8TTYMODE }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 131 | { NULL, 0 } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 132 | }; |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 133 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 134 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 135 | for (i = 0; check[i].pat; i++) { |
djm@openbsd.org | e661a86 | 2015-05-04 06:10:48 +0000 | [diff] [blame] | 136 | if (match_pattern_list(version, check[i].pat, 0) == 1) { |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 137 | debug("match: %s pat %s compat 0x%08x", |
markus@openbsd.org | 48b3b2b | 2015-01-19 20:20:20 +0000 | [diff] [blame] | 138 | version, check[i].pat, check[i].bugs); |
| 139 | datafellows = check[i].bugs; /* XXX for now */ |
| 140 | return check[i].bugs; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 141 | } |
| 142 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 143 | debug("no match: %s", version); |
markus@openbsd.org | 48b3b2b | 2015-01-19 20:20:20 +0000 | [diff] [blame] | 144 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 145 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 146 | |
| 147 | #define SEP "," |
| 148 | int |
| 149 | proto_spec(const char *spec) |
| 150 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 151 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 152 | int ret = SSH_PROTO_UNKNOWN; |
| 153 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 154 | if (spec == NULL) |
| 155 | return ret; |
markus@openbsd.org | 48b3b2b | 2015-01-19 20:20:20 +0000 | [diff] [blame] | 156 | q = s = strdup(spec); |
| 157 | if (s == NULL) |
| 158 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 159 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 160 | switch (atoi(p)) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 161 | case 2: |
| 162 | ret |= SSH_PROTO_2; |
| 163 | break; |
| 164 | default: |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 165 | logit("ignoring bad proto spec: '%s'.", p); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 166 | break; |
| 167 | } |
| 168 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 169 | free(s); |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 170 | return ret; |
| 171 | } |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 172 | |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 173 | char * |
| 174 | compat_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.org | 68bc8cf | 2017-02-03 23:01:19 +0000 | [diff] [blame] | 179 | if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL) |
| 180 | fatal("match_filter_list failed"); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 181 | 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 Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 187 | char * |
| 188 | compat_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.org | 68bc8cf | 2017-02-03 23:01:19 +0000 | [diff] [blame] | 193 | if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL) |
| 194 | fatal("match_filter_list failed"); |
Damien Miller | 324541e | 2013-12-31 12:25:40 +1100 | [diff] [blame] | 195 | 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 Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 201 | char * |
djm@openbsd.org | 318be28 | 2015-04-13 02:04:08 +0000 | [diff] [blame] | 202 | compat_kex_proposal(char *p) |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 203 | { |
djm@openbsd.org | 318be28 | 2015-04-13 02:04:08 +0000 | [diff] [blame] | 204 | 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.org | 68bc8cf | 2017-02-03 23:01:19 +0000 | [diff] [blame] | 208 | if ((p = match_filter_list(p, |
| 209 | "curve25519-sha256@libssh.org")) == NULL) |
| 210 | fatal("match_filter_list failed"); |
djm@openbsd.org | 318be28 | 2015-04-13 02:04:08 +0000 | [diff] [blame] | 211 | if ((datafellows & SSH_OLD_DHGEX) != 0) { |
djm@openbsd.org | 68bc8cf | 2017-02-03 23:01:19 +0000 | [diff] [blame] | 212 | 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.org | 318be28 | 2015-04-13 02:04:08 +0000 | [diff] [blame] | 216 | } |
| 217 | debug2("%s: compat KEX proposal: %s", __func__, p); |
| 218 | if (*p == '\0') |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 219 | fatal("No supported key exchange algorithms found"); |
djm@openbsd.org | 318be28 | 2015-04-13 02:04:08 +0000 | [diff] [blame] | 220 | return p; |
Damien Miller | 9395b28 | 2014-04-20 13:25:30 +1000 | [diff] [blame] | 221 | } |
| 222 | |