freebsd-dev/crypto/openssh/compat.c

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/* $OpenBSD: compat.c,v 1.113 2018/08/13 02:41:05 djm Exp $ */
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/*
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* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
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*
* 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"
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#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "xmalloc.h"
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#include "packet.h"
#include "compat.h"
#include "log.h"
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#include "match.h"
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#include "kex.h"
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int datafellows = 0;
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/* datafellows bug compatibility */
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u_int
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compat_datafellows(const char *version)
{
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int i;
static struct {
char *pat;
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int bugs;
} check[] = {
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{ "OpenSSH_2.*,"
"OpenSSH_3.0*,"
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"OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR|
SSH_BUG_SIGTYPE},
{ "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR|SSH_BUG_SIGTYPE },
{ "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
SSH_BUG_SIGTYPE},
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{ "OpenSSH_2*,"
"OpenSSH_3*,"
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"OpenSSH_4*", SSH_BUG_SIGTYPE },
{ "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT|
SSH_BUG_SIGTYPE},
{ "OpenSSH_6.6.1*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
{ "OpenSSH_6.5*,"
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"OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD|
SSH_BUG_SIGTYPE},
{ "OpenSSH_7.0*,"
"OpenSSH_7.1*,"
"OpenSSH_7.2*,"
"OpenSSH_7.3*,"
"OpenSSH_7.4*,"
"OpenSSH_7.5*,"
"OpenSSH_7.6*,"
"OpenSSH_7.7*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
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{ "OpenSSH*", SSH_NEW_OPENSSH },
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{ "*MindTerm*", 0 },
{ "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*,"
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"1.2.22*", SSH_BUG_IGNOREMSG },
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{ "1.3.2*", /* F-Secure */
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SSH_BUG_IGNOREMSG },
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{ "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
SSH_BUG_HOSTKEYS },
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{ "*SSH Compatible Server*", /* Netscreen */
SSH_BUG_PASSWORDPAD },
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{ "*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 },
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{ "PuTTY_Local:*," /* dev versions < Sep 2014 */
"PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
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"PuTTY_Release_0.5*," /* 0.58-0.59 */
"PuTTY_Release_0.60*,"
"PuTTY_Release_0.61*,"
"PuTTY_Release_0.62*,"
"PuTTY_Release_0.63*,"
"PuTTY_Release_0.64*",
SSH_OLD_DHGEX },
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{ "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
{ "Probe-*",
SSH_BUG_PROBE },
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{ "TeraTerm SSH*,"
"TTSSH/1.5.*,"
"TTSSH/2.1*,"
"TTSSH/2.2*,"
"TTSSH/2.3*,"
"TTSSH/2.4*,"
"TTSSH/2.5*,"
"TTSSH/2.6*,"
"TTSSH/2.70*,"
"TTSSH/2.71*,"
"TTSSH/2.72*", SSH_BUG_HOSTKEYS },
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{ "WinSCP_release_4*,"
"WinSCP_release_5.0*,"
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"WinSCP_release_5.1,"
"WinSCP_release_5.1.*,"
"WinSCP_release_5.5,"
"WinSCP_release_5.5.*,"
"WinSCP_release_5.6,"
"WinSCP_release_5.6.*,"
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"WinSCP_release_5.7,"
"WinSCP_release_5.7.1,"
"WinSCP_release_5.7.2,"
"WinSCP_release_5.7.3,"
"WinSCP_release_5.7.4",
SSH_OLD_DHGEX },
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{ "ConfD-*",
SSH_BUG_UTF8TTYMODE },
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{ "Twisted_*", 0 },
{ "Twisted*", SSH_BUG_DEBUG },
{ NULL, 0 }
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};
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/* process table, return first match */
for (i = 0; check[i].pat; i++) {
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if (match_pattern_list(version, check[i].pat, 0) == 1) {
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debug("match: %s pat %s compat 0x%08x",
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version, check[i].pat, check[i].bugs);
datafellows = check[i].bugs; /* XXX for now */
return check[i].bugs;
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}
}
debug("no match: %s", version);
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return 0;
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}
#define SEP ","
int
proto_spec(const char *spec)
{
char *s, *p, *q;
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int ret = SSH_PROTO_UNKNOWN;
if (spec == NULL)
return ret;
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q = s = strdup(spec);
if (s == NULL)
return ret;
for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
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switch (atoi(p)) {
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case 2:
ret |= SSH_PROTO_2;
break;
default:
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logit("ignoring bad proto spec: '%s'.", p);
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break;
}
}
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free(s);
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return ret;
}
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char *
compat_cipher_proposal(char *cipher_prop)
{
if (!(datafellows & SSH_BUG_BIGENDIANAES))
return cipher_prop;
debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
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if ((cipher_prop = match_filter_blacklist(cipher_prop, "aes*")) == NULL)
fatal("match_filter_blacklist failed");
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debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
if (*cipher_prop == '\0')
fatal("No supported ciphers found");
return cipher_prop;
}
char *
compat_pkalg_proposal(char *pkalg_prop)
{
if (!(datafellows & SSH_BUG_RSASIGMD5))
return pkalg_prop;
debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
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if ((pkalg_prop = match_filter_blacklist(pkalg_prop, "ssh-rsa")) == NULL)
fatal("match_filter_blacklist failed");
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debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
if (*pkalg_prop == '\0')
fatal("No supported PK algorithms found");
return pkalg_prop;
}
char *
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compat_kex_proposal(char *p)
{
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if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
return p;
debug2("%s: original KEX proposal: %s", __func__, p);
if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
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if ((p = match_filter_blacklist(p,
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"curve25519-sha256@libssh.org")) == NULL)
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fatal("match_filter_blacklist failed");
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if ((datafellows & SSH_OLD_DHGEX) != 0) {
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if ((p = match_filter_blacklist(p,
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"diffie-hellman-group-exchange-sha256,"
"diffie-hellman-group-exchange-sha1")) == NULL)
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fatal("match_filter_blacklist failed");
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}
debug2("%s: compat KEX proposal: %s", __func__, p);
if (*p == '\0')
fatal("No supported key exchange algorithms found");
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return p;
}