[gssapi-openssh.git] / openssh / compat.c

/*
 * 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"
RCSID("$OpenBSD: compat.c,v 1.61 2002/03/06 00:24:39 markus Exp $");

#include "buffer.h"
#include "packet.h"
#include "xmalloc.h"
#include "compat.h"
#include "log.h"
#include "match.h"

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;
	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 },
		{ "OpenSSH_2.3.0*",	SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
					SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
		{ "OpenSSH_2.3.*",	SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
					SSH_BUG_NOREKEY},
		{ "OpenSSH_2.5.0p1*,"
		  "OpenSSH_2.5.1p1*",
					SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
					SSH_BUG_NOREKEY },
		{ "OpenSSH_2.5.0*,"
		  "OpenSSH_2.5.1*,"
		  "OpenSSH_2.5.2*",	SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
		{ "OpenSSH_2.5.3*",	SSH_BUG_NOREKEY },
		{ "Sun_SSH_1.0*",	SSH_BUG_NOREKEY },
		{ "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 },
		{ "2.1 *",		SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
					SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
					SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
		{ "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 },
		{ "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 },
		{ "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 },
		{ "2.2.0*,"
		  "2.3.0*",		SSH_BUG_HMAC|SSH_BUG_DEBUG|
					SSH_BUG_RSASIGMD5 },
		{ "2.3.*",		SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5 },
		{ "2.4",		SSH_OLD_SESSIONID },	/* Van Dyke */
		{ "2.*",		SSH_BUG_DEBUG },
		{ "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*",		SSH_BUG_IGNOREMSG },	/* f-secure */
		{ "*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 },
		{ 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:
			log("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);
}
Commit	Line	Data
3c0ef626	1	/*
e9a17296	2	* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
3c0ef626	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
	25	#include "includes.h"
e9a17296	26	RCSID("$OpenBSD: compat.c,v 1.61 2002/03/06 00:24:39 markus Exp $");
3c0ef626	27
e9a17296	28	#include "buffer.h"
3c0ef626	29	#include "packet.h"
	30	#include "xmalloc.h"
	31	#include "compat.h"
	32	#include "log.h"
e9a17296	33	#include "match.h"
3c0ef626	34
	35	int compat13 = 0;
	36	int compat20 = 0;
	37	int datafellows = 0;
	38
	39	void
	40	enable_compat20(void)
	41	{
	42	verbose("Enabling compatibility mode for protocol 2.0");
	43	compat20 = 1;
	44	}
	45	void
	46	enable_compat13(void)
	47	{
	48	verbose("Enabling compatibility mode for protocol 1.3");
	49	compat13 = 1;
	50	}
	51	/* datafellows bug compatibility */
	52	void
	53	compat_datafellows(const char *version)
	54	{
e9a17296	55	int i;
3c0ef626	56	static struct {
	57	char *pat;
	58	int bugs;
	59	} check[] = {
e9a17296	60	{ "OpenSSH-2.0*,"
	61	"OpenSSH-2.1*,"
	62	"OpenSSH_2.1*,"
	63	"OpenSSH_2.2*", SSH_OLD_SESSIONID\|SSH_BUG_BANNER\|
3c0ef626	64	SSH_OLD_DHGEX\|SSH_BUG_NOREKEY },
e9a17296	65	{ "OpenSSH_2.3.0*", SSH_BUG_BANNER\|SSH_BUG_BIGENDIANAES\|
3c0ef626	66	SSH_OLD_DHGEX\|SSH_BUG_NOREKEY},
e9a17296	67	{ "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES\|SSH_OLD_DHGEX\|
3c0ef626	68	SSH_BUG_NOREKEY},
e9a17296	69	{ "OpenSSH_2.5.0p1*,"
e9a17296	70	"OpenSSH_2.5.1p1*",
3c0ef626	71	SSH_BUG_BIGENDIANAES\|SSH_OLD_DHGEX\|
3c0ef626	72	SSH_BUG_NOREKEY },
e9a17296	73	{ "OpenSSH_2.5.0*,"
	74	"OpenSSH_2.5.1*,"
	75	"OpenSSH_2.5.2*", SSH_OLD_DHGEX\|SSH_BUG_NOREKEY },
	76	{ "OpenSSH_2.5.3*", SSH_BUG_NOREKEY },
	77	{ "Sun_SSH_1.0*", SSH_BUG_NOREKEY },
	78	{ "OpenSSH*", 0 },
	79	{ "MindTerm", 0 },
	80	{ "2.1.0*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	81	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
3c0ef626	82	SSH_BUG_RSASIGMD5\|SSH_BUG_HBSERVICE },
e9a17296	83	{ "2.1 *", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	84	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
3c0ef626	85	SSH_BUG_RSASIGMD5\|SSH_BUG_HBSERVICE },
e9a17296	86	{ "2.0.13*,"
	87	"2.0.14*,"
	88	"2.0.15*,"
	89	"2.0.16*,"
	90	"2.0.17*,"
	91	"2.0.18*,"
	92	"2.0.19*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	93	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	94	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	95	SSH_BUG_PKOK\|SSH_BUG_RSASIGMD5\|
	96	SSH_BUG_HBSERVICE\|SSH_BUG_OPENFAILURE\|
	97	SSH_BUG_DUMMYCHAN },
e9a17296	98	{ "2.0.11*,"
e9a17296	99	"2.0.12*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	100	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	101	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	102	SSH_BUG_PKAUTH\|SSH_BUG_PKOK\|
	103	SSH_BUG_RSASIGMD5\|SSH_BUG_OPENFAILURE\|
	104	SSH_BUG_DUMMYCHAN },
e9a17296	105	{ "2.0.*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	106	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	107	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	108	SSH_BUG_PKAUTH\|SSH_BUG_PKOK\|
	109	SSH_BUG_RSASIGMD5\|SSH_BUG_OPENFAILURE\|
	110	SSH_BUG_DERIVEKEY\|SSH_BUG_DUMMYCHAN },
e9a17296	111	{ "2.2.0*,"
e9a17296	112	"2.3.0*", SSH_BUG_HMAC\|SSH_BUG_DEBUG\|
3c0ef626	113	SSH_BUG_RSASIGMD5 },
e9a17296	114	{ "2.3.*", SSH_BUG_DEBUG\|SSH_BUG_RSASIGMD5 },
	115	{ "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
	116	{ "2.*", SSH_BUG_DEBUG },
	117	{ "3.0.*", SSH_BUG_DEBUG },
	118	{ "3.0 SecureCRT*", SSH_OLD_SESSIONID },
	119	{ "1.7 SecureFX*", SSH_OLD_SESSIONID },
	120	{ "1.2.18*,"
	121	"1.2.19*,"
	122	"1.2.20*,"
	123	"1.2.21*,"
	124	"1.2.22*", SSH_BUG_IGNOREMSG },
	125	{ "1.3.2", SSH_BUG_IGNOREMSG }, / f-secure */
	126	{ "SSH Compatible Server", /* Netscreen */
3c0ef626	127	SSH_BUG_PASSWORDPAD },
e9a17296	128	{ "OSU_0,"
	129	"OSU_1.0*,"
	130	"OSU_1.1*,"
	131	"OSU_1.2*,"
	132	"OSU_1.3*,"
	133	"OSU_1.4*,"
	134	"OSU_1.5alpha1*,"
	135	"OSU_1.5alpha2*,"
	136	"OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
	137	{ "SSH_Version_Mapper",
3c0ef626	138	SSH_BUG_SCANNER },
	139	{ NULL, 0 }
	140	};
e9a17296	141
3c0ef626	142	/* process table, return first match */
3c0ef626	143	for (i = 0; check[i].pat; i++) {
e9a17296	144	if (match_pattern_list(version, check[i].pat,
e9a17296	145	strlen(check[i].pat), 0) == 1) {
3c0ef626	146	debug("match: %s pat %s", version, check[i].pat);
	147	datafellows = check[i].bugs;
	148	return;
	149	}
	150	}
	151	debug("no match: %s", version);
	152	}
	153
	154	#define SEP ","
	155	int
	156	proto_spec(const char *spec)
	157	{
	158	char s, p, *q;
	159	int ret = SSH_PROTO_UNKNOWN;
	160
	161	if (spec == NULL)
	162	return ret;
	163	q = s = xstrdup(spec);
	164	for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
e9a17296	165	switch (atoi(p)) {
3c0ef626	166	case 1:
	167	if (ret == SSH_PROTO_UNKNOWN)
	168	ret \|= SSH_PROTO_1_PREFERRED;
	169	ret \|= SSH_PROTO_1;
	170	break;
	171	case 2:
	172	ret \|= SSH_PROTO_2;
	173	break;
	174	default:
	175	log("ignoring bad proto spec: '%s'.", p);
	176	break;
	177	}
	178	}
	179	xfree(s);
	180	return ret;
	181	}
	182
	183	char *
	184	compat_cipher_proposal(char *cipher_prop)
	185	{
e9a17296	186	Buffer b;
3c0ef626	187	char orig_prop, fix_ciphers;
3c0ef626	188	char cp, tmp;
3c0ef626	189
	190	if (!(datafellows & SSH_BUG_BIGENDIANAES))
	191	return(cipher_prop);
	192
e9a17296	193	buffer_init(&b);
3c0ef626	194	tmp = orig_prop = xstrdup(cipher_prop);
e9a17296	195	while ((cp = strsep(&tmp, ",")) != NULL) {
	196	if (strncmp(cp, "aes", 3) != 0) {
	197	if (buffer_len(&b) > 0)
	198	buffer_append(&b, ",", 1);
	199	buffer_append(&b, cp, strlen(cp));
3c0ef626	200	}
3c0ef626	201	}
e9a17296	202	buffer_append(&b, "\0", 1);
	203	fix_ciphers = xstrdup(buffer_ptr(&b));
	204	buffer_free(&b);
3c0ef626	205	xfree(orig_prop);
	206	debug2("Original cipher proposal: %s", cipher_prop);
	207	debug2("Compat cipher proposal: %s", fix_ciphers);
	208	if (!*fix_ciphers)
	209	fatal("No available ciphers found.");
	210
	211	return(fix_ciphers);
	212	}