Annotation of src/usr.bin/ssh/compat.c, Revision 1.25
1.5 markus 1: /*
1.23 markus 2: * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
1.5 markus 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.
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:
1.1 markus 25: #include "includes.h"
1.25 ! markus 26: RCSID("$OpenBSD: compat.c,v 1.24 2000/10/10 20:20:45 markus Exp $");
1.2 markus 27:
1.1 markus 28: #include "ssh.h"
1.6 markus 29: #include "packet.h"
1.10 markus 30: #include "xmalloc.h"
31: #include "compat.h"
1.24 markus 32: #include <regex.h>
1.1 markus 33:
1.4 markus 34: int compat13 = 0;
1.6 markus 35: int compat20 = 0;
36: int datafellows = 0;
1.4 markus 37:
1.11 markus 38: void
1.6 markus 39: enable_compat20(void)
40: {
1.7 markus 41: verbose("Enabling compatibility mode for protocol 2.0");
42: compat20 = 1;
1.6 markus 43: }
1.11 markus 44: void
1.4 markus 45: enable_compat13(void)
46: {
1.3 markus 47: verbose("Enabling compatibility mode for protocol 1.3");
1.4 markus 48: compat13 = 1;
1.6 markus 49: }
50: /* datafellows bug compatibility */
51: void
52: compat_datafellows(const char *version)
53: {
1.24 markus 54: int i, ret;
55: char ebuf[1024];
56: regex_t reg;
57: static struct {
58: char *pat;
1.13 markus 59: int bugs;
60: } check[] = {
1.25 ! markus 61: { "^OpenSSH-2\\.[01]", SSH_OLD_SESSIONID },
! 62: { "^OpenSSH_2\\.2", SSH_OLD_SESSIONID },
! 63: { "MindTerm", 0 },
! 64: { "^2\\.1\\.0 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
! 65: SSH_OLD_SESSIONID },
! 66: { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
! 67: SSH_OLD_SESSIONID|
! 68: SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD },
! 69: { "^2\\.[23]\\.0 ", SSH_BUG_HMAC},
! 70: { "^2\\.[2-9]\\.", 0 },
! 71: { "^2\\.", SSH_BUG_HMAC}, /* XXX fallback */
! 72: { NULL, 0 }
1.6 markus 73: };
1.21 markus 74: /* process table, return first match */
1.24 markus 75: for (i = 0; check[i].pat; i++) {
76: ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
77: if (ret != 0) {
78: regerror(ret, ®, ebuf, sizeof(ebuf));
79: ebuf[sizeof(ebuf)-1] = '\0';
80: error("regerror: %s", ebuf);
81: continue;
82: }
83: ret = regexec(®, version, 0, NULL, 0);
84: regfree(®);
85: if (ret == 0) {
86: debug("match: %s pat %s\n", version, check[i].pat);
1.13 markus 87: datafellows = check[i].bugs;
1.6 markus 88: return;
89: }
90: }
1.24 markus 91: debug("no match: %s", version);
1.10 markus 92: }
93:
94: #define SEP ","
95: int
96: proto_spec(const char *spec)
97: {
1.18 provos 98: char *s, *p, *q;
1.10 markus 99: int ret = SSH_PROTO_UNKNOWN;
100:
1.14 markus 101: if (spec == NULL)
102: return ret;
1.18 provos 103: q = s = xstrdup(spec);
1.19 ho 104: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.10 markus 105: switch(atoi(p)) {
106: case 1:
107: if (ret == SSH_PROTO_UNKNOWN)
108: ret |= SSH_PROTO_1_PREFERRED;
109: ret |= SSH_PROTO_1;
110: break;
111: case 2:
112: ret |= SSH_PROTO_2;
113: break;
114: default:
115: log("ignoring bad proto spec: '%s'.", p);
116: break;
117: }
118: }
119: xfree(s);
120: return ret;
1.1 markus 121: }