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/*
* Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
RCSID("$OpenBSD: compat.c,v 1.27 2000/10/31 09:31:58 markus Exp $");
#include "ssh.h"
#include "packet.h"
#include "xmalloc.h"
#include "compat.h"
#ifdef HAVE_LIBPCRE
# include <pcreposix.h>
#else /* Use native regex libraries */
# include <regex.h>
#endif /* HAVE_LIBRX */
int compat13 = 0;
int compat20 = 0;
int datafellows = 0;
void
enable_compat20(void)
{
verbose("Enabling compatibility mode for protocol 2.0");
compat20 = 1;
}
void
enable_compat13(void)
{
verbose("Enabling compatibility mode for protocol 1.3");
compat13 = 1;
}
/* datafellows bug compatibility */
void
compat_datafellows(const char *version)
{
int i, ret;
char ebuf[1024];
regex_t reg;
static struct {
char *pat;
int bugs;
} check[] = {
{ "^OpenSSH[-_]2\\.[012]", SSH_OLD_SESSIONID },
{ "MindTerm", 0 },
{ "^2\\.1\\.0 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
SSH_OLD_SESSIONID },
{ "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
SSH_OLD_SESSIONID|
SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD },
{ "^2\\.[23]\\.0 ", SSH_BUG_HMAC},
{ "^2\\.[2-9]\\.", 0 },
{ "^2\\.4$", SSH_OLD_SESSIONID}, /* Van Dyke */
{ "^3\\.0 SecureCRT", SSH_OLD_SESSIONID},
{ "^1\\.7 SecureFX", SSH_OLD_SESSIONID},
{ "^2\\.", SSH_BUG_HMAC}, /* XXX fallback */
{ NULL, 0 }
};
/* process table, return first match */
for (i = 0; check[i].pat; i++) {
ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
if (ret != 0) {
regerror(ret, ®, ebuf, sizeof(ebuf));
ebuf[sizeof(ebuf)-1] = '\0';
error("regerror: %s", ebuf);
continue;
}
ret = regexec(®, version, 0, NULL, 0);
regfree(®);
if (ret == 0) {
debug("match: %s pat %s\n", version, check[i].pat);
datafellows = check[i].bugs;
return;
}
}
debug("no match: %s", version);
}
#define SEP ","
int
proto_spec(const char *spec)
{
char *s, *p, *q;
int ret = SSH_PROTO_UNKNOWN;
if (spec == NULL)
return ret;
q = s = xstrdup(spec);
for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
switch(atoi(p)) {
case 1:
if (ret == SSH_PROTO_UNKNOWN)
ret |= SSH_PROTO_1_PREFERRED;
ret |= SSH_PROTO_1;
break;
case 2:
ret |= SSH_PROTO_2;
break;
default:
log("ignoring bad proto spec: '%s'.", p);
break;
}
}
xfree(s);
return ret;
}
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