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aa3378df | 1 | /* |
bcbf86ec | 2 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
aa3378df | 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. | |
aa3378df | 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 | ||
8efc0c15 | 25 | #include "includes.h" |
94ec8c6b | 26 | RCSID("$OpenBSD: compat.c,v 1.24 2000/10/10 20:20:45 markus Exp $"); |
8efc0c15 | 27 | |
28 | #include "ssh.h" | |
7e7327a1 | 29 | #include "packet.h" |
a8be9f80 | 30 | #include "xmalloc.h" |
31 | #include "compat.h" | |
d8f1edd5 | 32 | #ifdef HAVE_LIBRX |
33 | # include <rxposix.h> | |
34 | #else /* Use native regex libraries */ | |
35 | # include <regex.h> | |
36 | #endif /* HAVE_LIBRX */ | |
8efc0c15 | 37 | |
5260325f | 38 | int compat13 = 0; |
7e7327a1 | 39 | int compat20 = 0; |
40 | int datafellows = 0; | |
5260325f | 41 | |
6ae2364d | 42 | void |
7e7327a1 | 43 | enable_compat20(void) |
44 | { | |
8ce64345 | 45 | verbose("Enabling compatibility mode for protocol 2.0"); |
46 | compat20 = 1; | |
7e7327a1 | 47 | } |
6ae2364d | 48 | void |
5260325f | 49 | enable_compat13(void) |
50 | { | |
51 | verbose("Enabling compatibility mode for protocol 1.3"); | |
52 | compat13 = 1; | |
8efc0c15 | 53 | } |
7e7327a1 | 54 | /* datafellows bug compatibility */ |
55 | void | |
56 | compat_datafellows(const char *version) | |
57 | { | |
94ec8c6b | 58 | int i, ret; |
59 | char ebuf[1024]; | |
60 | regex_t reg; | |
61 | static struct { | |
62 | char *pat; | |
d0c832f3 | 63 | int bugs; |
64 | } check[] = { | |
94ec8c6b | 65 | {"^.*MindTerm", 0}, |
66 | {"^2\\.1\\.0 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC}, | |
67 | {"^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD}, | |
68 | {"^2\\.[23]\\.0 ", SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING}, | |
69 | {"^2\\.[2-9]\\.", SSH_COMPAT_SESSIONID_ENCODING}, | |
70 | {"^2\\.", SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING}, | |
71 | {NULL, 0} | |
7e7327a1 | 72 | }; |
14a9a859 | 73 | /* process table, return first match */ |
94ec8c6b | 74 | for (i = 0; check[i].pat; i++) { |
75 | ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB); | |
76 | if (ret != 0) { | |
77 | regerror(ret, ®, ebuf, sizeof(ebuf)); | |
78 | ebuf[sizeof(ebuf)-1] = '\0'; | |
79 | error("regerror: %s", ebuf); | |
80 | continue; | |
81 | } | |
82 | ret = regexec(®, version, 0, NULL, 0); | |
83 | regfree(®); | |
84 | if (ret == 0) { | |
85 | debug("match: %s pat %s\n", version, check[i].pat); | |
d0c832f3 | 86 | datafellows = check[i].bugs; |
7e7327a1 | 87 | return; |
88 | } | |
89 | } | |
94ec8c6b | 90 | debug("no match: %s", version); |
7e7327a1 | 91 | } |
a8be9f80 | 92 | |
93 | #define SEP "," | |
94 | int | |
95 | proto_spec(const char *spec) | |
96 | { | |
089fbbd2 | 97 | char *s, *p, *q; |
a8be9f80 | 98 | int ret = SSH_PROTO_UNKNOWN; |
99 | ||
71276795 | 100 | if (spec == NULL) |
101 | return ret; | |
089fbbd2 | 102 | q = s = xstrdup(spec); |
103 | for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) { | |
a8be9f80 | 104 | switch(atoi(p)) { |
105 | case 1: | |
106 | if (ret == SSH_PROTO_UNKNOWN) | |
107 | ret |= SSH_PROTO_1_PREFERRED; | |
108 | ret |= SSH_PROTO_1; | |
109 | break; | |
110 | case 2: | |
111 | ret |= SSH_PROTO_2; | |
112 | break; | |
113 | default: | |
114 | log("ignoring bad proto spec: '%s'.", p); | |
115 | break; | |
116 | } | |
117 | } | |
118 | xfree(s); | |
119 | return ret; | |
120 | } |