1 /*	$NetBSD: vendorid.c,v 1.8 2009/09/01 12:22:09 tteras Exp $	*/
2 
3 /* Id: vendorid.c,v 1.10 2006/02/22 16:10:21 vanhu Exp */
4 
5 /*
6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the project nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include "config.h"
35 
36 #include <sys/types.h>
37 #include <sys/param.h>
38 
39 #include <stdlib.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <errno.h>
43 #include <ctype.h>
44 
45 #include "var.h"
46 #include "misc.h"
47 #include "vmbuf.h"
48 #include "plog.h"
49 #include "debug.h"
50 
51 #include "localconf.h"
52 #include "isakmp_var.h"
53 #include "isakmp.h"
54 #include "vendorid.h"
55 #include "crypto_openssl.h"
56 #include "handler.h"
57 #include "remoteconf.h"
58 #ifdef ENABLE_NATT
59 #include "nattraversal.h"
60 #endif
61 #ifdef ENABLE_HYBRID
62 #include <resolv.h>
63 #include "isakmp_xauth.h"
64 #include "isakmp_cfg.h"
65 #endif
66 
67 static struct vendor_id all_vendor_ids[] = {
68 { VENDORID_IPSEC_TOOLS, "IPSec-Tools" },
69 { VENDORID_GSSAPI_LONG, "A GSS-API Authentication Method for IKE" },
70 { VENDORID_GSSAPI     , "GSSAPI" },
71 { VENDORID_MS_NT5     , "MS NT5 ISAKMPOAKLEY" },
72 { VENDORID_NATT_00    , "draft-ietf-ipsec-nat-t-ike-00" },
73 { VENDORID_NATT_01    , "draft-ietf-ipsec-nat-t-ike-01" },
74 { VENDORID_NATT_02    , "draft-ietf-ipsec-nat-t-ike-02" },
75 { VENDORID_NATT_02_N  , "draft-ietf-ipsec-nat-t-ike-02\n" },
76 { VENDORID_NATT_03    , "draft-ietf-ipsec-nat-t-ike-03" },
77 { VENDORID_NATT_04    , "draft-ietf-ipsec-nat-t-ike-04" },
78 { VENDORID_NATT_05    , "draft-ietf-ipsec-nat-t-ike-05" },
79 { VENDORID_NATT_06    , "draft-ietf-ipsec-nat-t-ike-06" },
80 { VENDORID_NATT_07    , "draft-ietf-ipsec-nat-t-ike-07" },
81 { VENDORID_NATT_08    , "draft-ietf-ipsec-nat-t-ike-08" },
82 { VENDORID_NATT_RFC   , "RFC 3947" },
83 { VENDORID_XAUTH      , "draft-ietf-ipsra-isakmp-xauth-06.txt" },
84 { VENDORID_UNITY      , "CISCO-UNITY" },
85 { VENDORID_FRAG       , "FRAGMENTATION" },
86 /* Just a readable string for DPD ... */
87 { VENDORID_DPD        , "DPD" },
88 /* Other known Vendor IDs */
89 { VENDORID_KAME       , "KAME/racoon" },
90 };
91 
92 #define NUMVENDORIDS	(sizeof(all_vendor_ids)/sizeof(all_vendor_ids[0]))
93 
94 #define DPD_MAJOR_VERSION	0x01
95 #define DPD_MINOR_VERSION	0x00
96 
97 const char vendorid_dpd_hash[] = {
98 	0xAF, 0xCA, 0xD7, 0x13,
99 	0x68, 0xA1, 0xF1, 0xC9,
100 	0x6B, 0x86, 0x96, 0xFC,
101 	0x77, 0x57, DPD_MAJOR_VERSION, DPD_MINOR_VERSION
102 };
103 
104 
105 static vchar_t *vendorid_fixup(int, vchar_t *t);
106 
107 static struct vendor_id *
108 lookup_vendor_id_by_id (int id)
109 {
110 	int i;
111 
112 	for (i = 0; i < NUMVENDORIDS; i++)
113 		if (all_vendor_ids[i].id == id)
114 			return &all_vendor_ids[i];
115 
116 	return NULL;
117 }
118 
119 const char *
120 vid_string_by_id (int id)
121 {
122 	struct vendor_id *current;
123 
124 	if (id == VENDORID_DPD)
125 		return vendorid_dpd_hash;
126 
127 	current = lookup_vendor_id_by_id(id);
128 
129 	return current ? current->string : NULL;
130 }
131 
132 static struct vendor_id *
133 lookup_vendor_id_by_hash (const char *hash)
134 {
135 	int i;
136 	unsigned char *h = (unsigned char *)hash;
137 
138 	for (i = 0; i < NUMVENDORIDS; i++)
139 		if (strncmp(all_vendor_ids[i].hash->v, hash,
140 			    all_vendor_ids[i].hash->l) == 0)
141 			return &all_vendor_ids[i];
142 
143 	return NULL;
144 }
145 
146 void
147 compute_vendorids (void)
148 {
149 	int i;
150 	vchar_t vid;
151 
152 	for (i = 0; i < NUMVENDORIDS; i++) {
153 		/* VENDORID_DPD is not a MD5 sum... */
154 		if(all_vendor_ids[i].id == VENDORID_DPD){
155 			all_vendor_ids[i].hash = vmalloc(sizeof(vendorid_dpd_hash));
156 			if (all_vendor_ids[i].hash == NULL) {
157 				plog(LLV_ERROR, LOCATION, NULL,
158 					"unable to get memory for VID hash\n");
159 				exit(1); /* this really shouldn't happen */
160 			}
161 			memcpy(all_vendor_ids[i].hash->v, vendorid_dpd_hash,
162 				   sizeof(vendorid_dpd_hash));
163 			continue;
164 		}
165 
166 		vid.v = (char *) all_vendor_ids[i].string;
167 		vid.l = strlen(vid.v);
168 
169 		all_vendor_ids[i].hash = eay_md5_one(&vid);
170 		if (all_vendor_ids[i].hash == NULL)
171 			plog(LLV_ERROR, LOCATION, NULL,
172 			    "unable to hash vendor ID string\n");
173 
174 		/* Special cases */
175 		all_vendor_ids[i].hash =
176 			vendorid_fixup(all_vendor_ids[i].id,
177 				       all_vendor_ids[i].hash);
178 	}
179 }
180 
181 /*
182  * set hashed vendor id.
183  * hash function is always MD5.
184  */
185 vchar_t *
186 set_vendorid(int vendorid)
187 {
188 	struct vendor_id *current;
189 	vchar_t vid, *new;
190 
191 	if (vendorid == VENDORID_UNKNOWN) {
192 		/*
193 		 * The default unknown ID gets translated to
194 		 * KAME/racoon.
195 		 */
196 		vendorid = VENDORID_DEFAULT;
197 	}
198 
199 	current = lookup_vendor_id_by_id(vendorid);
200 	if (current == NULL) {
201 		plog(LLV_ERROR, LOCATION, NULL,
202 		    "invalid vendor ID index: %d\n", vendorid);
203 		return (NULL);
204 	}
205 
206 	/* The rest of racoon expects a private copy
207 	 * of the VID that could be free'd after use.
208 	 * That's why we don't return the original pointer. */
209 	return vdup(current->hash);
210 }
211 
212 /*
213  * Check the vendor ID payload -- return the vendor ID index
214  * if we find a recognized one, or UNKNOWN if we don't.
215  *
216  * gen ... points to Vendor ID payload.
217  */
218 static int
219 check_vendorid(struct isakmp_gen *gen)
220 {
221 	vchar_t vid, *vidhash;
222 	int i, vidlen;
223 	struct vendor_id *current;
224 
225 	if (gen == NULL)
226 		return (VENDORID_UNKNOWN);
227 
228 	vidlen = ntohs(gen->len) - sizeof(*gen);
229 
230 	current = lookup_vendor_id_by_hash((char *)(gen + 1));
231 	if (!current)
232 		goto unknown;
233 
234 	if (current->hash->l < vidlen)
235 		plog(LLV_INFO, LOCATION, NULL,
236 		     "received broken Microsoft ID: %s\n",
237 		     current->string);
238 	else
239 		plog(LLV_INFO, LOCATION, NULL,
240 		     "received Vendor ID: %s\n",
241 		     current->string);
242 
243 	return current->id;
244 
245 unknown:
246 	plog(LLV_DEBUG, LOCATION, NULL, "received unknown Vendor ID\n");
247 	plogdump(LLV_DEBUG, (char *)(gen + 1), vidlen);
248 	return (VENDORID_UNKNOWN);
249 }
250 
251 int
252 handle_vendorid(struct ph1handle *iph1, struct isakmp_gen *gen)
253 {
254 	int vid_numeric;
255 
256 	vid_numeric = check_vendorid(gen);
257 	if (vid_numeric == VENDORID_UNKNOWN)
258 		return vid_numeric;
259 
260 	iph1->vendorid_mask |= BIT(vid_numeric);
261 
262 #ifdef ENABLE_NATT
263 	if (natt_vendorid(vid_numeric))
264 		natt_handle_vendorid(iph1, vid_numeric);
265 #endif
266 #ifdef ENABLE_HYBRID
267 	switch (vid_numeric) {
268 	case VENDORID_XAUTH:
269 		iph1->mode_cfg->flags |= ISAKMP_CFG_VENDORID_XAUTH;
270 		break;
271 	case VENDORID_UNITY:
272 		iph1->mode_cfg->flags |= ISAKMP_CFG_VENDORID_UNITY;
273 		break;
274 	default:
275 		break;
276 	}
277 #endif
278 #ifdef ENABLE_DPD
279 	if (vid_numeric == VENDORID_DPD &&
280 	    (iph1->rmconf == NULL || iph1->rmconf->dpd)) {
281 		iph1->dpd_support = 1;
282 		plog(LLV_DEBUG, LOCATION, NULL, "remote supports DPD\n");
283 	}
284 #endif
285 
286 	return vid_numeric;
287 }
288 
289 static vchar_t *
290 vendorid_fixup(vendorid, vidhash)
291 	int vendorid;
292 	vchar_t *vidhash;
293 {
294 	switch(vendorid) {
295 	case VENDORID_XAUTH: {	/* The vendor Id is truncated */
296 		vchar_t *tmp;
297 
298 		if ((tmp = vmalloc(8)) == NULL) {
299 			plog(LLV_ERROR, LOCATION, NULL,
300 			    "unable to hash vendor ID string\n");
301 			return NULL;
302 		}
303 
304 		memcpy(tmp->v, vidhash->v, 8);
305 		vfree(vidhash);
306 		vidhash = tmp;
307 
308 		break;
309 	}
310 	case VENDORID_UNITY:	/* Two bytes tweak */
311 		vidhash->v[14] = 0x01;
312 		vidhash->v[15] = 0x00;
313 		break;
314 
315 	default:
316 		break;
317 	}
318 
319 	return vidhash;
320 }
321