Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1 | /* |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 2 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 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. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 12 | * |
| 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. |
| 23 | */ |
| 24 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | #include "includes.h" |
Damien Miller | 914bef4 | 2002-01-22 23:34:35 +1100 | [diff] [blame] | 26 | RCSID("$OpenBSD: compat.c,v 1.58 2002/01/21 22:30:12 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 28 | #include "buffer.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 29 | #include "packet.h" |
| 30 | #include "xmalloc.h" |
| 31 | #include "compat.h" |
| 32 | #include "log.h" |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 33 | #include "match.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 35 | int compat13 = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 36 | int compat20 = 0; |
| 37 | int datafellows = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 38 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 39 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 40 | enable_compat20(void) |
| 41 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 42 | verbose("Enabling compatibility mode for protocol 2.0"); |
| 43 | compat20 = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 44 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 45 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 46 | enable_compat13(void) |
| 47 | { |
| 48 | verbose("Enabling compatibility mode for protocol 1.3"); |
| 49 | compat13 = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 51 | /* datafellows bug compatibility */ |
| 52 | void |
| 53 | compat_datafellows(const char *version) |
| 54 | { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 55 | int i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 56 | static struct { |
| 57 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 58 | int bugs; |
| 59 | } check[] = { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 60 | { "OpenSSH-2.0*," |
| 61 | "OpenSSH-2.1*," |
| 62 | "OpenSSH_2.1*," |
| 63 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 64 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 65 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 66 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 67 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 68 | SSH_BUG_NOREKEY}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 69 | { "OpenSSH_2.5.0p1*," |
| 70 | "OpenSSH_2.5.1p1*", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 71 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
| 72 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 73 | { "OpenSSH_2.5.0*," |
| 74 | "OpenSSH_2.5.1*," |
| 75 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
| 76 | { "OpenSSH_2.5.3*", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 77 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 78 | { "OpenSSH*", 0 }, |
| 79 | { "*MindTerm*", 0 }, |
| 80 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 81 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 82 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 83 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 84 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 85 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 86 | { "2.0.13*," |
| 87 | "2.0.14*," |
| 88 | "2.0.15*," |
| 89 | "2.0.16*," |
| 90 | "2.0.17*," |
| 91 | "2.0.18*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 92 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 93 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 94 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 95 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 96 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
| 97 | SSH_BUG_DUMMYCHAN }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 98 | { "2.0.11*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 99 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 100 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 101 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 102 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 103 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
| 104 | SSH_BUG_DUMMYCHAN }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 105 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 8c96392 | 2001-04-30 23:06:57 +0000 | [diff] [blame] | 106 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 107 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
| 108 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
| 109 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 110 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 111 | { "2.2.0*," |
| 112 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| |
Ben Lindstrom | 3b4d42c | 2001-09-18 05:55:10 +0000 | [diff] [blame] | 113 | SSH_BUG_RSASIGMD5 }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 114 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 }, |
| 115 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
| 116 | { "2.*", SSH_BUG_DEBUG }, |
| 117 | { "3.0.*", SSH_BUG_DEBUG }, |
| 118 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, |
| 119 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, |
| 120 | { "1.2.18*," |
| 121 | "1.2.19*," |
| 122 | "1.2.20*," |
| 123 | "1.2.21*," |
| 124 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
| 125 | { "1.3.2*", SSH_BUG_IGNOREMSG }, /* f-secure */ |
| 126 | { "*SSH Compatible Server*", /* Netscreen */ |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 127 | SSH_BUG_PASSWORDPAD }, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 128 | { "*OSU_0*," |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 129 | "OSU_1.0*," |
| 130 | "OSU_1.1*," |
| 131 | "OSU_1.2*," |
| 132 | "OSU_1.3*," |
| 133 | "OSU_1.4*," |
| 134 | "OSU_1.5alpha1*," |
| 135 | "OSU_1.5alpha2*," |
| 136 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, |
| 137 | { "*SSH_Version_Mapper*", |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 138 | SSH_BUG_SCANNER }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 139 | { NULL, 0 } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 140 | }; |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 141 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 142 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 143 | for (i = 0; check[i].pat; i++) { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame] | 144 | if (match_pattern_list(version, check[i].pat, |
| 145 | strlen(check[i].pat), 0) == 1) { |
Ben Lindstrom | 971c973 | 2000-12-10 02:01:50 +0000 | [diff] [blame] | 146 | debug("match: %s pat %s", version, check[i].pat); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 147 | datafellows = check[i].bugs; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 148 | return; |
| 149 | } |
| 150 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 151 | debug("no match: %s", version); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 152 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 153 | |
| 154 | #define SEP "," |
| 155 | int |
| 156 | proto_spec(const char *spec) |
| 157 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 158 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 159 | int ret = SSH_PROTO_UNKNOWN; |
| 160 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 161 | if (spec == NULL) |
| 162 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 163 | q = s = xstrdup(spec); |
| 164 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 165 | switch (atoi(p)) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 166 | case 1: |
| 167 | if (ret == SSH_PROTO_UNKNOWN) |
| 168 | ret |= SSH_PROTO_1_PREFERRED; |
| 169 | ret |= SSH_PROTO_1; |
| 170 | break; |
| 171 | case 2: |
| 172 | ret |= SSH_PROTO_2; |
| 173 | break; |
| 174 | default: |
| 175 | log("ignoring bad proto spec: '%s'.", p); |
| 176 | break; |
| 177 | } |
| 178 | } |
| 179 | xfree(s); |
| 180 | return ret; |
| 181 | } |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 182 | |
| 183 | char * |
| 184 | compat_cipher_proposal(char *cipher_prop) |
| 185 | { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 186 | Buffer b; |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 187 | char *orig_prop, *fix_ciphers; |
| 188 | char *cp, *tmp; |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 189 | |
| 190 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) |
| 191 | return(cipher_prop); |
| 192 | |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 193 | buffer_init(&b); |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 194 | tmp = orig_prop = xstrdup(cipher_prop); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 195 | while ((cp = strsep(&tmp, ",")) != NULL) { |
Damien Miller | 914bef4 | 2002-01-22 23:34:35 +1100 | [diff] [blame] | 196 | if (strncmp(cp, "aes", 3) != 0) { |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 197 | if (buffer_len(&b) > 0) |
| 198 | buffer_append(&b, ",", 1); |
| 199 | buffer_append(&b, cp, strlen(cp)); |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 200 | } |
| 201 | } |
Damien Miller | 0e3b872 | 2002-01-22 23:26:38 +1100 | [diff] [blame] | 202 | buffer_append(&b, "\0", 1); |
| 203 | fix_ciphers = xstrdup(buffer_ptr(&b)); |
| 204 | buffer_free(&b); |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 205 | xfree(orig_prop); |
| 206 | debug2("Original cipher proposal: %s", cipher_prop); |
| 207 | debug2("Compat cipher proposal: %s", fix_ciphers); |
| 208 | if (!*fix_ciphers) |
| 209 | fatal("No available ciphers found."); |
| 210 | |
| 211 | return(fix_ciphers); |
| 212 | } |