Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1 | /* |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 2 | * Copyright (c) 1999,2000 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 | 671388f | 2001-04-19 20:40:45 +0000 | [diff] [blame] | 26 | RCSID("$OpenBSD: compat.c,v 1.47 2001/04/18 23:43:25 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Ben Lindstrom | b562864 | 2000-10-18 00:02:25 +0000 | [diff] [blame] | 28 | #ifdef HAVE_LIBPCRE |
| 29 | # include <pcreposix.h> |
Ben Lindstrom | ca1c2a0 | 2000-10-14 21:33:19 +0000 | [diff] [blame] | 30 | #else /* Use native regex libraries */ |
Ben Lindstrom | 401d58f | 2001-01-19 17:11:43 +0000 | [diff] [blame] | 31 | # ifdef HAVE_REGEX_H |
| 32 | # include <regex.h> |
| 33 | # else |
Tim Rice | b399be4 | 2001-03-17 18:43:16 -0800 | [diff] [blame] | 34 | # include "openbsd-compat/fake-regex.h" |
Ben Lindstrom | 401d58f | 2001-01-19 17:11:43 +0000 | [diff] [blame] | 35 | # endif |
Kevin Steves | 48d0d25 | 2000-12-15 23:05:57 +0000 | [diff] [blame] | 36 | #endif /* HAVE_LIBPCRE */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 38 | #include "packet.h" |
| 39 | #include "xmalloc.h" |
| 40 | #include "compat.h" |
| 41 | #include "log.h" |
| 42 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 43 | int compat13 = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 44 | int compat20 = 0; |
| 45 | int datafellows = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 46 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 47 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 48 | enable_compat20(void) |
| 49 | { |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 50 | verbose("Enabling compatibility mode for protocol 2.0"); |
| 51 | compat20 = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 52 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 53 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 54 | enable_compat13(void) |
| 55 | { |
| 56 | verbose("Enabling compatibility mode for protocol 1.3"); |
| 57 | compat13 = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 59 | /* datafellows bug compatibility */ |
| 60 | void |
| 61 | compat_datafellows(const char *version) |
| 62 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 63 | int i, ret; |
| 64 | char ebuf[1024]; |
| 65 | regex_t reg; |
| 66 | static struct { |
| 67 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 68 | int bugs; |
| 69 | } check[] = { |
Ben Lindstrom | 48bd7c1 | 2001-01-09 00:35:42 +0000 | [diff] [blame] | 70 | { "^OpenSSH[-_]2\\.[012]", |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 71 | SSH_OLD_SESSIONID|SSH_BUG_BANNER| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 72 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 73 | { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES| |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 74 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY}, |
| 75 | { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
| 76 | SSH_BUG_NOREKEY}, |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 77 | { "^OpenSSH_2\\.5\\.[01]p1", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 78 | SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX| |
| 79 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | df22139 | 2001-03-29 00:36:16 +0000 | [diff] [blame] | 80 | { "^OpenSSH_2\\.5\\.[012]", |
Ben Lindstrom | a8baf36 | 2001-04-05 23:28:36 +0000 | [diff] [blame] | 81 | SSH_OLD_DHGEX|SSH_BUG_NOREKEY }, |
| 82 | { "^OpenSSH_2\\.5\\.3", |
| 83 | SSH_BUG_NOREKEY }, |
Ben Lindstrom | 48bd7c1 | 2001-01-09 00:35:42 +0000 | [diff] [blame] | 84 | { "^OpenSSH", 0 }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 85 | { "MindTerm", 0 }, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 86 | { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 87 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 88 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Ben Lindstrom | 5de86cc | 2001-03-05 06:08:19 +0000 | [diff] [blame] | 89 | { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 90 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 91 | SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE }, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 92 | { "^2\\.0\\.1[3-9]", 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| |
| 96 | SSH_BUG_HBSERVICE }, |
Ben Lindstrom | d121f61 | 2000-12-03 17:00:47 +0000 | [diff] [blame] | 97 | { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC| |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 98 | SSH_OLD_SESSIONID|SSH_BUG_DEBUG| |
| 99 | SSH_BUG_PKSERVICE|SSH_BUG_X11FWD| |
Ben Lindstrom | 60a4381 | 2001-03-29 00:32:56 +0000 | [diff] [blame] | 100 | SSH_BUG_PKAUTH|SSH_BUG_PKOK| |
| 101 | SSH_BUG_RSASIGMD5 }, |
| 102 | { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 }, |
| 103 | { "^2\\.3\\.", SSH_BUG_RSASIGMD5 }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 104 | { "^2\\.[2-9]\\.", 0 }, |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 105 | { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */ |
| 106 | { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID }, |
| 107 | { "^1\\.7 SecureFX", SSH_OLD_SESSIONID }, |
| 108 | { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG }, |
| 109 | { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG }, |
Ben Lindstrom | 78c261a | 2001-04-04 23:43:26 +0000 | [diff] [blame] | 110 | { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */ |
Ben Lindstrom | d20d0f3 | 2001-03-10 17:22:20 +0000 | [diff] [blame] | 111 | { "^SSH Compatible Server", /* Netscreen */ |
| 112 | SSH_BUG_PASSWORDPAD }, |
| 113 | { "^OSU_0", SSH_BUG_PASSWORDPAD }, |
| 114 | { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD }, |
| 115 | { "^OSU_1\\.5alpha[1-3]", |
| 116 | SSH_BUG_PASSWORDPAD }, |
Damien Miller | 27dbe6f | 2001-03-19 22:36:20 +1100 | [diff] [blame] | 117 | { "^SSH_Version_Mapper", |
| 118 | SSH_BUG_SCANNER }, |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 119 | { NULL, 0 } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 120 | }; |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 121 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 122 | for (i = 0; check[i].pat; i++) { |
| 123 | ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); |
| 124 | if (ret != 0) { |
| 125 | regerror(ret, ®, ebuf, sizeof(ebuf)); |
| 126 | ebuf[sizeof(ebuf)-1] = '\0'; |
| 127 | error("regerror: %s", ebuf); |
| 128 | continue; |
| 129 | } |
| 130 | ret = regexec(®, version, 0, NULL, 0); |
| 131 | regfree(®); |
| 132 | if (ret == 0) { |
Ben Lindstrom | 971c973 | 2000-12-10 02:01:50 +0000 | [diff] [blame] | 133 | debug("match: %s pat %s", version, check[i].pat); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 134 | datafellows = check[i].bugs; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 135 | return; |
| 136 | } |
| 137 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 138 | debug("no match: %s", version); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 139 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 140 | |
| 141 | #define SEP "," |
| 142 | int |
| 143 | proto_spec(const char *spec) |
| 144 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 145 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 146 | int ret = SSH_PROTO_UNKNOWN; |
| 147 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 148 | if (spec == NULL) |
| 149 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 150 | q = s = xstrdup(spec); |
| 151 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 152 | switch(atoi(p)) { |
| 153 | case 1: |
| 154 | if (ret == SSH_PROTO_UNKNOWN) |
| 155 | ret |= SSH_PROTO_1_PREFERRED; |
| 156 | ret |= SSH_PROTO_1; |
| 157 | break; |
| 158 | case 2: |
| 159 | ret |= SSH_PROTO_2; |
| 160 | break; |
| 161 | default: |
| 162 | log("ignoring bad proto spec: '%s'.", p); |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | xfree(s); |
| 167 | return ret; |
| 168 | } |
Ben Lindstrom | c8530c7 | 2001-03-24 00:35:19 +0000 | [diff] [blame] | 169 | |
| 170 | char * |
| 171 | compat_cipher_proposal(char *cipher_prop) |
| 172 | { |
| 173 | char *orig_prop, *fix_ciphers; |
| 174 | char *cp, *tmp; |
| 175 | size_t len; |
| 176 | |
| 177 | if (!(datafellows & SSH_BUG_BIGENDIANAES)) |
| 178 | return(cipher_prop); |
| 179 | |
| 180 | len = strlen(cipher_prop) + 1; |
| 181 | fix_ciphers = xmalloc(len); |
| 182 | *fix_ciphers = '\0'; |
| 183 | tmp = orig_prop = xstrdup(cipher_prop); |
| 184 | while((cp = strsep(&tmp, ",")) != NULL) { |
| 185 | if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) { |
| 186 | if (*fix_ciphers) |
| 187 | strlcat(fix_ciphers, ",", len); |
| 188 | strlcat(fix_ciphers, cp, len); |
| 189 | } |
| 190 | } |
| 191 | xfree(orig_prop); |
| 192 | debug2("Original cipher proposal: %s", cipher_prop); |
| 193 | debug2("Compat cipher proposal: %s", fix_ciphers); |
| 194 | if (!*fix_ciphers) |
| 195 | fatal("No available ciphers found."); |
| 196 | |
| 197 | return(fix_ciphers); |
| 198 | } |