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" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 26 | RCSID("$OpenBSD: compat.c,v 1.24 2000/10/10 20:20:45 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
| 28 | #include "ssh.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 29 | #include "packet.h" |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 30 | #include "xmalloc.h" |
| 31 | #include "compat.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 32 | #include <regex.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [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 | { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 54 | int i, ret; |
| 55 | char ebuf[1024]; |
| 56 | regex_t reg; |
| 57 | static struct { |
| 58 | char *pat; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 59 | int bugs; |
| 60 | } check[] = { |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 61 | {"^.*MindTerm", 0}, |
| 62 | {"^2\\.1\\.0 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC}, |
| 63 | {"^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD}, |
| 64 | {"^2\\.[23]\\.0 ", SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING}, |
| 65 | {"^2\\.[2-9]\\.", SSH_COMPAT_SESSIONID_ENCODING}, |
| 66 | {"^2\\.", SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING}, |
| 67 | {NULL, 0} |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 68 | }; |
Damien Miller | caf6dd6 | 2000-08-29 11:33:50 +1100 | [diff] [blame] | 69 | /* process table, return first match */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 70 | for (i = 0; check[i].pat; i++) { |
| 71 | ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); |
| 72 | if (ret != 0) { |
| 73 | regerror(ret, ®, ebuf, sizeof(ebuf)); |
| 74 | ebuf[sizeof(ebuf)-1] = '\0'; |
| 75 | error("regerror: %s", ebuf); |
| 76 | continue; |
| 77 | } |
| 78 | ret = regexec(®, version, 0, NULL, 0); |
| 79 | regfree(®); |
| 80 | if (ret == 0) { |
| 81 | debug("match: %s pat %s\n", version, check[i].pat); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 82 | datafellows = check[i].bugs; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 83 | return; |
| 84 | } |
| 85 | } |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame^] | 86 | debug("no match: %s", version); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 87 | } |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 88 | |
| 89 | #define SEP "," |
| 90 | int |
| 91 | proto_spec(const char *spec) |
| 92 | { |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 93 | char *s, *p, *q; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 94 | int ret = SSH_PROTO_UNKNOWN; |
| 95 | |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 96 | if (spec == NULL) |
| 97 | return ret; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 98 | q = s = xstrdup(spec); |
| 99 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 100 | switch(atoi(p)) { |
| 101 | case 1: |
| 102 | if (ret == SSH_PROTO_UNKNOWN) |
| 103 | ret |= SSH_PROTO_1_PREFERRED; |
| 104 | ret |= SSH_PROTO_1; |
| 105 | break; |
| 106 | case 2: |
| 107 | ret |= SSH_PROTO_2; |
| 108 | break; |
| 109 | default: |
| 110 | log("ignoring bad proto spec: '%s'.", p); |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | xfree(s); |
| 115 | return ret; |
| 116 | } |