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" |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 26 | RCSID("$OpenBSD: compat.c,v 1.55 2001/12/05 16:54:51 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 28 | #include "packet.h" |
| 29 | #include "xmalloc.h" |
| 30 | #include "compat.h" |
| 31 | #include "log.h" |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 32 | #include "match.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 33 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 34 | int compat13 = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 35 | int compat20 = 0; |
| 36 | int datafellows = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 37 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 38 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 39 | enable_compat20(void) |
| 40 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 41 | verbose("Enabling compatibility mode for protocol 2.0"); |
| 42 | compat20 = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 43 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 44 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 45 | enable_compat13(void) |
| 46 | { |
| 47 | verbose("Enabling compatibility mode for protocol 1.3"); |
| 48 | compat13 = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 49 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 50 | /* datafellows bug compatibility */ |
| 51 | void |
| 52 | compat_datafellows(const char *version) |
| 53 | { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 54 | int i; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 55 | static struct { |
| 56 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 57 | int bugs; |
| 58 | } check[] = { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 59 | { "OpenSSH-2.0*," |
| 60 | "OpenSSH-2.1*," |
| 61 | "OpenSSH_2.1*," |
| 62 | "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 63 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 64 | { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 65 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 66 | { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 67 | SSH_BUG_NOREKEY}, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 68 | { "OpenSSH_2.5.0p1*," |
| 69 | "OpenSSH_2.5.1p1*", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 70 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
| 71 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 72 | { "OpenSSH_2.5.0*," |
| 73 | "OpenSSH_2.5.1*," |
| 74 | "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
| 75 | { "OpenSSH_2.5.3*", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 76 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 77 | { "OpenSSH*", 0 }, |
| 78 | { "*MindTerm*", 0 }, |
| 79 | { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 80 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 81 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 82 | { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 83 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 84 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 85 | { "2.0.13*," |
| 86 | "2.0.14*," |
| 87 | "2.0.15*," |
| 88 | "2.0.16*," |
| 89 | "2.0.17*," |
| 90 | "2.0.18*," |
| 91 | "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 92 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 266dfdf | 2001-03-09 00:12:22 +0000 | [diff] [blame] | 93 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 94 | SSH_BUG_PKOK|SSH_BUG_RSASIGMD5| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 95 | SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE| |
| 96 | SSH_BUG_DUMMYCHAN }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 97 | { "2.0.11*," |
| 98 | "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 99 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 100 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 101 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 102 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
| 103 | SSH_BUG_DUMMYCHAN }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 104 | { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 8c96392 | 2001-04-30 23:06:57 +0000 | [diff] [blame] | 105 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 106 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
| 107 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
| 108 | SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE| |
Ben Lindstrom | f558cf6 | 2001-09-20 23:13:49 +0000 | [diff] [blame] | 109 | SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 110 | { "2.2.0*," |
| 111 | "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG| |
Ben Lindstrom | 3b4d42c | 2001-09-18 05:55:10 +0000 | [diff] [blame] | 112 | SSH_BUG_RSASIGMD5 }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 113 | { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 }, |
| 114 | { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */ |
| 115 | { "2.*", SSH_BUG_DEBUG }, |
| 116 | { "3.0.*", SSH_BUG_DEBUG }, |
| 117 | { "3.0 SecureCRT*", SSH_OLD_SESSIONID }, |
| 118 | { "1.7 SecureFX*", SSH_OLD_SESSIONID }, |
| 119 | { "1.2.18*," |
| 120 | "1.2.19*," |
| 121 | "1.2.20*," |
| 122 | "1.2.21*," |
| 123 | "1.2.22*", SSH_BUG_IGNOREMSG }, |
| 124 | { "1.3.2*", SSH_BUG_IGNOREMSG }, /* f-secure */ |
| 125 | { "*SSH Compatible Server*", /* Netscreen */ |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 126 | SSH_BUG_PASSWORDPAD }, |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 127 | { "*OSU_0*," |
| 128 | "OSU_1.0*," |
| 129 | "OSU_1.1*," |
| 130 | "OSU_1.2*," |
| 131 | "OSU_1.3*," |
| 132 | "OSU_1.4*," |
| 133 | "OSU_1.5alpha1*," |
| 134 | "OSU_1.5alpha2*," |
| 135 | "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD }, |
| 136 | { "*SSH_Version_Mapper*", |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 137 | SSH_BUG_SCANNER }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 138 | { NULL, 0 } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 139 | }; |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 140 | |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 141 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 142 | for (i = 0; check[i].pat; i++) { |
Ben Lindstrom | 9eab262 | 2001-12-06 18:06:05 +0000 | [diff] [blame^] | 143 | if (match_pattern_list(version, check[i].pat, |
| 144 | strlen(check[i].pat), 0) == 1) { |
Ben Lindstrom | 971c973 | 2000-12-10 02:01:50 +0000 | [diff] [blame] | 145 | debug("match: %s pat %s", version, check[i].pat); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 146 | datafellows = check[i].bugs; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 147 | return; |
| 148 | } |
| 149 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 150 | debug("no match: %s", version); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 151 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 152 | |
| 153 | #define SEP "," |
| 154 | int |
| 155 | proto_spec(const char *spec) |
| 156 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 157 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 158 | int ret = SSH_PROTO_UNKNOWN; |
| 159 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 160 | if (spec == NULL) |
| 161 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 162 | q = s = xstrdup(spec); |
| 163 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 164 | switch (atoi(p)) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 165 | case 1: |
| 166 | if (ret == SSH_PROTO_UNKNOWN) |
| 167 | ret |= SSH_PROTO_1_PREFERRED; |
| 168 | ret |= SSH_PROTO_1; |
| 169 | break; |
| 170 | case 2: |
| 171 | ret |= SSH_PROTO_2; |
| 172 | break; |
| 173 | default: |
| 174 | log("ignoring bad proto spec: '%s'.", p); |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | xfree(s); |
| 179 | return ret; |
| 180 | } |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 181 | |
| 182 | char * |
| 183 | compat_cipher_proposal(char *cipher_prop) |
| 184 | { |
| 185 | char *orig_prop, *fix_ciphers; |
| 186 | char *cp, *tmp; |
| 187 | size_t len; |
| 188 | |
| 189 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) |
| 190 | return(cipher_prop); |
| 191 | |
| 192 | len = strlen(cipher_prop) + 1; |
| 193 | fix_ciphers = xmalloc(len); |
| 194 | *fix_ciphers = '\0'; |
| 195 | tmp = orig_prop = xstrdup(cipher_prop); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 196 | while ((cp = strsep(&tmp, ",")) != NULL) { |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 197 | if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) { |
| 198 | if (*fix_ciphers) |
| 199 | strlcat(fix_ciphers, ",", len); |
| 200 | strlcat(fix_ciphers, cp, len); |
| 201 | } |
| 202 | } |
| 203 | xfree(orig_prop); |
| 204 | debug2("Original cipher proposal: %s", cipher_prop); |
| 205 | debug2("Compat cipher proposal: %s", fix_ciphers); |
| 206 | if (!*fix_ciphers) |
| 207 | fatal("No available ciphers found."); |
| 208 | |
| 209 | return(fix_ciphers); |
| 210 | } |