[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 1.66 2003/04/01 10:31:26 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)
{
	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},
		{ "OpenSSH_2.3.0*",	SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
					SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
					SSH_BUG_EXTEOF},
		{ "OpenSSH_2.3.*",	SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
					SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
		{ "OpenSSH_2.5.0p1*,"
		  "OpenSSH_2.5.1p1*",
					SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
					SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
					SSH_OLD_GSSAPI},
		{ "OpenSSH_2.5.0*,"
		  "OpenSSH_2.5.1*,"
		  "OpenSSH_2.5.2*",	SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
					SSH_BUG_EXTEOF},
		{ "OpenSSH_2.5.3*",	SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
		{ "OpenSSH_2.9p*",	SSH_OLD_GSSAPI },
		{ "OpenSSH_2.*,"
		  "OpenSSH_3.0*,"
		  "OpenSSH_3.1*",	SSH_BUG_EXTEOF|SSH_BUG_GSS_EMPTYUSER},
		{ "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 },
		{ "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|SSH_BUG_K5USER },
		{ "1.3.2*",		/* F-Secure */
					SSH_BUG_IGNOREMSG|SSH_BUG_K5USER },
		{ "1.2.1*,"
		  "1.2.2*,"
		  "1.2.3*",		SSH_BUG_K5USER },
		{ "*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:
			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"
1c14df9e	26	RCSID("$OpenBSD: compat.c,v 1.66 2003/04/01 10:31:26 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	{
e54b3d7c	42	debug("Enabling compatibility mode for protocol 2.0");
3c0ef626	43	compat20 = 1;
	44	}
	45	void
	46	enable_compat13(void)
	47	{
e54b3d7c	48	debug("Enabling compatibility mode for protocol 1.3");
3c0ef626	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\|
2980ea68	64	SSH_OLD_DHGEX\|SSH_BUG_NOREKEY\|
2980ea68	65	SSH_BUG_EXTEOF},
e9a17296	66	{ "OpenSSH_2.3.0*", SSH_BUG_BANNER\|SSH_BUG_BIGENDIANAES\|
2980ea68	67	SSH_OLD_DHGEX\|SSH_BUG_NOREKEY\|
2980ea68	68	SSH_BUG_EXTEOF},
e9a17296	69	{ "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES\|SSH_OLD_DHGEX\|
2980ea68	70	SSH_BUG_NOREKEY\|SSH_BUG_EXTEOF},
e9a17296	71	{ "OpenSSH_2.5.0p1*,"
e9a17296	72	"OpenSSH_2.5.1p1*",
3c0ef626	73	SSH_BUG_BIGENDIANAES\|SSH_OLD_DHGEX\|
2980ea68	74	SSH_BUG_NOREKEY\|SSH_BUG_EXTEOF\|
2980ea68	75	SSH_OLD_GSSAPI},
e9a17296	76	{ "OpenSSH_2.5.0*,"
e9a17296	77	"OpenSSH_2.5.1*,"
2980ea68	78	"OpenSSH_2.5.2*", SSH_OLD_DHGEX\|SSH_BUG_NOREKEY\|
	79	SSH_BUG_EXTEOF},
	80	{ "OpenSSH_2.5.3*", SSH_BUG_NOREKEY\|SSH_BUG_EXTEOF},
b9a54c29	81	{ "OpenSSH_2.9p*", SSH_OLD_GSSAPI },
2980ea68	82	{ "OpenSSH_2.*,"
	83	"OpenSSH_3.0*,"
	84	"OpenSSH_3.1*", SSH_BUG_EXTEOF\|SSH_BUG_GSS_EMPTYUSER},
	85	{ "Sun_SSH_1.0*", SSH_BUG_NOREKEY\|SSH_BUG_EXTEOF},
e9a17296	86	{ "OpenSSH*", 0 },
	87	{ "MindTerm", 0 },
	88	{ "2.1.0*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	89	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
1c14df9e	90	SSH_BUG_RSASIGMD5\|SSH_BUG_HBSERVICE\|
1c14df9e	91	SSH_BUG_FIRSTKEX },
e9a17296	92	{ "2.1 *", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	93	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
1c14df9e	94	SSH_BUG_RSASIGMD5\|SSH_BUG_HBSERVICE\|
1c14df9e	95	SSH_BUG_FIRSTKEX },
e9a17296	96	{ "2.0.13*,"
	97	"2.0.14*,"
	98	"2.0.15*,"
	99	"2.0.16*,"
	100	"2.0.17*,"
	101	"2.0.18*,"
	102	"2.0.19*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	103	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	104	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	105	SSH_BUG_PKOK\|SSH_BUG_RSASIGMD5\|
	106	SSH_BUG_HBSERVICE\|SSH_BUG_OPENFAILURE\|
1c14df9e	107	SSH_BUG_DUMMYCHAN\|SSH_BUG_FIRSTKEX },
e9a17296	108	{ "2.0.11*,"
e9a17296	109	"2.0.12*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	110	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	111	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	112	SSH_BUG_PKAUTH\|SSH_BUG_PKOK\|
	113	SSH_BUG_RSASIGMD5\|SSH_BUG_OPENFAILURE\|
1c14df9e	114	SSH_BUG_DUMMYCHAN\|SSH_BUG_FIRSTKEX },
e9a17296	115	{ "2.0.*", SSH_BUG_SIGBLOB\|SSH_BUG_HMAC\|
3c0ef626	116	SSH_OLD_SESSIONID\|SSH_BUG_DEBUG\|
	117	SSH_BUG_PKSERVICE\|SSH_BUG_X11FWD\|
	118	SSH_BUG_PKAUTH\|SSH_BUG_PKOK\|
	119	SSH_BUG_RSASIGMD5\|SSH_BUG_OPENFAILURE\|
1c14df9e	120	SSH_BUG_DERIVEKEY\|SSH_BUG_DUMMYCHAN\|
1c14df9e	121	SSH_BUG_FIRSTKEX },
e9a17296	122	{ "2.2.0*,"
e9a17296	123	"2.3.0*", SSH_BUG_HMAC\|SSH_BUG_DEBUG\|
1c14df9e	124	SSH_BUG_RSASIGMD5\|SSH_BUG_FIRSTKEX },
	125	{ "2.3.*", SSH_BUG_DEBUG\|SSH_BUG_RSASIGMD5\|
	126	SSH_BUG_FIRSTKEX },
e9a17296	127	{ "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1c14df9e	128	{ "2.*", SSH_BUG_DEBUG\|SSH_BUG_FIRSTKEX },
e9a17296	129	{ "3.0.*", SSH_BUG_DEBUG },
	130	{ "3.0 SecureCRT*", SSH_OLD_SESSIONID },
	131	{ "1.7 SecureFX*", SSH_OLD_SESSIONID },
	132	{ "1.2.18*,"
	133	"1.2.19*,"
	134	"1.2.20*,"
	135	"1.2.21*,"
2980ea68	136	"1.2.22*", SSH_BUG_IGNOREMSG\|SSH_BUG_K5USER },
	137	{ "1.3.2", / F-Secure */
	138	SSH_BUG_IGNOREMSG\|SSH_BUG_K5USER },
	139	{ "1.2.1*,"
	140	"1.2.2*,"
	141	"1.2.3*", SSH_BUG_K5USER },
e9a17296	142	{ "SSH Compatible Server", /* Netscreen */
3c0ef626	143	SSH_BUG_PASSWORDPAD },
e9a17296	144	{ "OSU_0,"
	145	"OSU_1.0*,"
	146	"OSU_1.1*,"
	147	"OSU_1.2*,"
	148	"OSU_1.3*,"
	149	"OSU_1.4*,"
	150	"OSU_1.5alpha1*,"
	151	"OSU_1.5alpha2*,"
	152	"OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
	153	{ "SSH_Version_Mapper",
3c0ef626	154	SSH_BUG_SCANNER },
e54b3d7c	155	{ "Probe-*",
e54b3d7c	156	SSH_BUG_PROBE },
3c0ef626	157	{ NULL, 0 }
3c0ef626	158	};
e9a17296	159
3c0ef626	160	/* process table, return first match */
3c0ef626	161	for (i = 0; check[i].pat; i++) {
e9a17296	162	if (match_pattern_list(version, check[i].pat,
e9a17296	163	strlen(check[i].pat), 0) == 1) {
3c0ef626	164	debug("match: %s pat %s", version, check[i].pat);
	165	datafellows = check[i].bugs;
	166	return;
	167	}
	168	}
	169	debug("no match: %s", version);
	170	}
	171
	172	#define SEP ","
	173	int
	174	proto_spec(const char *spec)
	175	{
	176	char s, p, *q;
	177	int ret = SSH_PROTO_UNKNOWN;
	178
	179	if (spec == NULL)
	180	return ret;
	181	q = s = xstrdup(spec);
	182	for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
e9a17296	183	switch (atoi(p)) {
3c0ef626	184	case 1:
	185	if (ret == SSH_PROTO_UNKNOWN)
	186	ret \|= SSH_PROTO_1_PREFERRED;
	187	ret \|= SSH_PROTO_1;
	188	break;
	189	case 2:
	190	ret \|= SSH_PROTO_2;
	191	break;
	192	default:
	193	log("ignoring bad proto spec: '%s'.", p);
	194	break;
	195	}
	196	}
	197	xfree(s);
	198	return ret;
	199	}
	200
	201	char *
	202	compat_cipher_proposal(char *cipher_prop)
	203	{
e9a17296	204	Buffer b;
3c0ef626	205	char orig_prop, fix_ciphers;
3c0ef626	206	char cp, tmp;
3c0ef626	207
	208	if (!(datafellows & SSH_BUG_BIGENDIANAES))
	209	return(cipher_prop);
	210
e9a17296	211	buffer_init(&b);
3c0ef626	212	tmp = orig_prop = xstrdup(cipher_prop);
e9a17296	213	while ((cp = strsep(&tmp, ",")) != NULL) {
	214	if (strncmp(cp, "aes", 3) != 0) {
	215	if (buffer_len(&b) > 0)
	216	buffer_append(&b, ",", 1);
	217	buffer_append(&b, cp, strlen(cp));
3c0ef626	218	}
3c0ef626	219	}
e9a17296	220	buffer_append(&b, "\0", 1);
	221	fix_ciphers = xstrdup(buffer_ptr(&b));
	222	buffer_free(&b);
3c0ef626	223	xfree(orig_prop);
	224	debug2("Original cipher proposal: %s", cipher_prop);
	225	debug2("Compat cipher proposal: %s", fix_ciphers);
	226	if (!*fix_ciphers)
	227	fatal("No available ciphers found.");
	228
	229	return(fix_ciphers);
	230	}