b7aa600c41
I have worked hard to reduce diffs against the vendor branch. One notable change in that respect is that we no longer prefer DSA over RSA - the reasons for doing so went away years ago. This may cause some surprises, as ssh will warn about unknown host keys even for hosts whose keys haven't changed. MFC after: 6 weeks
237 lines
6.6 KiB
C
237 lines
6.6 KiB
C
/* $OpenBSD: compat.c,v 1.77 2006/12/12 03:58:42 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 1999, 2000, 2001, 2002 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"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "buffer.h"
|
|
#include "packet.h"
|
|
#include "compat.h"
|
|
#include "log.h"
|
|
#include "match.h"
|
|
|
|
int compat13 = 0;
|
|
int compat20 = 0;
|
|
int datafellows = 0;
|
|
|
|
void
|
|
enable_compat20(void)
|
|
{
|
|
debug("Enabling compatibility mode for protocol 2.0");
|
|
compat20 = 1;
|
|
}
|
|
void
|
|
enable_compat13(void)
|
|
{
|
|
debug("Enabling compatibility mode for protocol 1.3");
|
|
compat13 = 1;
|
|
}
|
|
/* datafellows bug compatibility */
|
|
void
|
|
compat_datafellows(const char *version)
|
|
{
|
|
int i;
|
|
static struct {
|
|
char *pat;
|
|
int bugs;
|
|
} check[] = {
|
|
{ "OpenSSH-2.0*,"
|
|
"OpenSSH-2.1*,"
|
|
"OpenSSH_2.1*,"
|
|
"OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
|
|
SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
|
|
SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
|
|
SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
|
|
SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
|
|
SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
|
|
SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.5.0p1*,"
|
|
"OpenSSH_2.5.1p1*",
|
|
SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
|
|
SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
|
|
SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.5.0*,"
|
|
"OpenSSH_2.5.1*,"
|
|
"OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
|
|
SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
|
|
SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_2.*,"
|
|
"OpenSSH_3.0*,"
|
|
"OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
|
|
{ "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
|
|
{ "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
|
|
{ "OpenSSH*", 0 },
|
|
{ "*MindTerm*", 0 },
|
|
{ "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
|
|
SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
|
|
SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
|
|
SSH_BUG_FIRSTKEX },
|
|
{ "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
|
|
SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
|
|
SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
|
|
SSH_BUG_FIRSTKEX },
|
|
{ "2.0.13*,"
|
|
"2.0.14*,"
|
|
"2.0.15*,"
|
|
"2.0.16*,"
|
|
"2.0.17*,"
|
|
"2.0.18*,"
|
|
"2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
|
|
SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
|
|
SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
|
|
SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
|
|
SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
|
|
SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
|
|
{ "2.0.11*,"
|
|
"2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
|
|
SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
|
|
SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
|
|
SSH_BUG_PKAUTH|SSH_BUG_PKOK|
|
|
SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
|
|
SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
|
|
{ "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
|
|
SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
|
|
SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
|
|
SSH_BUG_PKAUTH|SSH_BUG_PKOK|
|
|
SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
|
|
SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
|
|
SSH_BUG_FIRSTKEX },
|
|
{ "2.2.0*,"
|
|
"2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
|
|
SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
|
|
{ "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
|
|
SSH_BUG_FIRSTKEX },
|
|
{ "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
|
|
{ "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
|
|
SSH_BUG_RFWD_ADDR },
|
|
{ "3.0.*", SSH_BUG_DEBUG },
|
|
{ "3.0 SecureCRT*", SSH_OLD_SESSIONID },
|
|
{ "1.7 SecureFX*", SSH_OLD_SESSIONID },
|
|
{ "1.2.18*,"
|
|
"1.2.19*,"
|
|
"1.2.20*,"
|
|
"1.2.21*,"
|
|
"1.2.22*", SSH_BUG_IGNOREMSG },
|
|
{ "1.3.2*", /* F-Secure */
|
|
SSH_BUG_IGNOREMSG },
|
|
{ "*SSH Compatible Server*", /* Netscreen */
|
|
SSH_BUG_PASSWORDPAD },
|
|
{ "*OSU_0*,"
|
|
"OSU_1.0*,"
|
|
"OSU_1.1*,"
|
|
"OSU_1.2*,"
|
|
"OSU_1.3*,"
|
|
"OSU_1.4*,"
|
|
"OSU_1.5alpha1*,"
|
|
"OSU_1.5alpha2*,"
|
|
"OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
|
|
{ "*SSH_Version_Mapper*",
|
|
SSH_BUG_SCANNER },
|
|
{ "Probe-*",
|
|
SSH_BUG_PROBE },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
/* process table, return first match */
|
|
for (i = 0; check[i].pat; i++) {
|
|
if (match_pattern_list(version, check[i].pat,
|
|
strlen(check[i].pat), 0) == 1) {
|
|
debug("match: %s pat %s", 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:
|
|
logit("ignoring bad proto spec: '%s'.", p);
|
|
break;
|
|
}
|
|
}
|
|
xfree(s);
|
|
return ret;
|
|
}
|
|
|
|
char *
|
|
compat_cipher_proposal(char *cipher_prop)
|
|
{
|
|
Buffer b;
|
|
char *orig_prop, *fix_ciphers;
|
|
char *cp, *tmp;
|
|
|
|
if (!(datafellows & SSH_BUG_BIGENDIANAES))
|
|
return(cipher_prop);
|
|
|
|
buffer_init(&b);
|
|
tmp = orig_prop = xstrdup(cipher_prop);
|
|
while ((cp = strsep(&tmp, ",")) != NULL) {
|
|
if (strncmp(cp, "aes", 3) != 0) {
|
|
if (buffer_len(&b) > 0)
|
|
buffer_append(&b, ",", 1);
|
|
buffer_append(&b, cp, strlen(cp));
|
|
}
|
|
}
|
|
buffer_append(&b, "\0", 1);
|
|
fix_ciphers = xstrdup(buffer_ptr(&b));
|
|
buffer_free(&b);
|
|
xfree(orig_prop);
|
|
debug2("Original cipher proposal: %s", cipher_prop);
|
|
debug2("Compat cipher proposal: %s", fix_ciphers);
|
|
if (!*fix_ciphers)
|
|
fatal("No available ciphers found.");
|
|
|
|
return(fix_ciphers);
|
|
}
|