1/* $Id: vendorid.c,v 1.7 2005/01/29 16:34:25 vanhu Exp $ */
2
3/*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include "config.h"
33
34#include <sys/types.h>
35#include <sys/param.h>
36
37#include <stdlib.h>
38#include <stdio.h>
39#include <string.h>
40#include <errno.h>
41#include <ctype.h>
42
43#include "var.h"
44#include "misc.h"
45#include "vmbuf.h"
46#include "plog.h"
47#include "debug.h"
48
49#include "localconf.h"
50#include "isakmp_var.h"
51#include "isakmp.h"
52#include "vendorid.h"
53#include "crypto_openssl.h"
54
55static struct vendor_id all_vendor_ids[] = {
56{ VENDORID_KAME       , "KAME/racoon" },
57{ VENDORID_GSSAPI_LONG, "A GSS-API Authentication Method for IKE" },
58{ VENDORID_GSSAPI     , "GSSAPI" },
59{ VENDORID_MS_NT5     , "MS NT5 ISAKMPOAKLEY" },
60{ VENDORID_NATT_00    , "draft-ietf-ipsec-nat-t-ike-00" },
61{ VENDORID_NATT_01    , "draft-ietf-ipsec-nat-t-ike-01" },
62{ VENDORID_NATT_02    , "draft-ietf-ipsec-nat-t-ike-02" },
63{ VENDORID_NATT_02_N  , "draft-ietf-ipsec-nat-t-ike-02\n" },
64{ VENDORID_NATT_03    , "draft-ietf-ipsec-nat-t-ike-03" },
65{ VENDORID_NATT_04    , "draft-ietf-ipsec-nat-t-ike-04" },
66{ VENDORID_NATT_05    , "draft-ietf-ipsec-nat-t-ike-05" },
67{ VENDORID_NATT_06    , "draft-ietf-ipsec-nat-t-ike-06" },
68{ VENDORID_NATT_07    , "draft-ietf-ipsec-nat-t-ike-07" },
69{ VENDORID_NATT_08    , "draft-ietf-ipsec-nat-t-ike-08" },
70{ VENDORID_NATT_APPLE , "draft-ietf-ipsec-nat-t-ike" },
71{ VENDORID_NATT_RFC   , "RFC 3947" },
72{ VENDORID_XAUTH      , "draft-ietf-ipsra-isakmp-xauth-06.txt" },
73{ VENDORID_UNITY      , "CISCO-UNITY" },
74{ VENDORID_FRAG       , "FRAGMENTATION" },
75/* Just a readable string for DPD ... */
76{ VENDORID_DPD        , "DPD" },
77};
78
79#define NUMVENDORIDS	(sizeof(all_vendor_ids)/sizeof(all_vendor_ids[0]))
80
81#define DPD_MAJOR_VERSION	0x01
82#define DPD_MINOR_VERSION	0x00
83
84const char vendorid_dpd_hash[] = {
85	0xAF, 0xCA, 0xD7, 0x13,
86	0x68, 0xA1, 0xF1, 0xC9,
87	0x6B, 0x86, 0x96, 0xFC,
88	0x77, 0x57, DPD_MAJOR_VERSION, DPD_MINOR_VERSION
89};
90
91
92static vchar_t *vendorid_fixup(int, vchar_t *t);
93
94static struct vendor_id *
95lookup_vendor_id_by_id (int id)
96{
97	int i;
98
99	for (i = 0; i < NUMVENDORIDS; i++)
100		if (all_vendor_ids[i].id == id)
101			return &all_vendor_ids[i];
102
103	return NULL;
104}
105
106const char *
107vid_string_by_id (int id)
108{
109	struct vendor_id *current;
110
111	if (id == VENDORID_DPD)
112		return vendorid_dpd_hash;
113
114	current = lookup_vendor_id_by_id(id);
115
116	return current ? current->string : NULL;
117}
118
119static struct vendor_id *
120lookup_vendor_id_by_hash (const char *hash)
121{
122	int i;
123
124	for (i = 0; i < NUMVENDORIDS; i++)
125		if (strncmp(all_vendor_ids[i].hash->v, hash,
126			    all_vendor_ids[i].hash->l) == 0)
127			return &all_vendor_ids[i];
128
129	return NULL;
130}
131
132void
133compute_vendorids (void)
134{
135	int i;
136	vchar_t vid;
137
138	for (i = 0; i < NUMVENDORIDS; i++) {
139		/* VENDORID_DPD is not a MD5 sum... */
140		if(i == VENDORID_DPD){
141			all_vendor_ids[i].hash = vmalloc(sizeof(vendorid_dpd_hash));
142			if (all_vendor_ids[i].hash == NULL) {
143				plog(ASL_LEVEL_ERR,
144					"unable to get memory for VID hash\n");
145				exit(1); /* this really shouldn't happen */
146			}
147			memcpy(all_vendor_ids[i].hash->v, vendorid_dpd_hash,
148				   sizeof(vendorid_dpd_hash));
149			continue;
150		}
151
152		vid.v = (char *) all_vendor_ids[i].string;
153		vid.l = strlen(vid.v);
154
155		all_vendor_ids[i].hash = eay_md5_one(&vid);
156		if (all_vendor_ids[i].hash == NULL)
157			plog(ASL_LEVEL_ERR,
158			    "unable to hash vendor ID string\n");
159
160		/* Special cases */
161		all_vendor_ids[i].hash =
162			vendorid_fixup(all_vendor_ids[i].id,
163				       all_vendor_ids[i].hash);
164	}
165}
166
167/*
168 * set hashed vendor id.
169 * hash function is always MD5.
170 */
171vchar_t *
172set_vendorid(int vendorid)
173{
174	struct vendor_id *current;
175
176	if (vendorid == VENDORID_UNKNOWN) {
177		/*
178		 * The default unknown ID gets translated to
179		 * KAME/racoon.
180		 */
181		vendorid = VENDORID_KAME;
182	}
183
184	current = lookup_vendor_id_by_id(vendorid);
185	if (current == NULL) {
186		plog(ASL_LEVEL_ERR,
187		    "invalid vendor ID index: %d\n", vendorid);
188		return (NULL);
189	}
190
191	/* The rest of racoon expects a private copy
192	 * of the VID that could be free'd after use.
193	 * That's why we don't return the original pointer. */
194	return vdup(current->hash);
195}
196
197/*
198 * Check the vendor ID payload -- return the vendor ID index
199 * if we find a recognized one, or UNKNOWN if we don't.
200 *
201 * gen ... points to Vendor ID payload.
202 */
203int
204check_vendorid(struct isakmp_gen *gen)
205{
206	int vidlen;
207	struct vendor_id *current;
208
209	if (gen == NULL)
210		return (VENDORID_UNKNOWN);
211
212	vidlen = ntohs(gen->len) - sizeof(*gen);
213
214	current = lookup_vendor_id_by_hash((char *)(gen + 1));
215	if (!current)
216		goto unknown;
217
218	if (current->hash->l < vidlen)
219		plog(ASL_LEVEL_INFO,
220		     "received broken Microsoft ID: %s\n",
221		     current->string);
222	else
223		plog(ASL_LEVEL_INFO,
224		     "received Vendor ID: %s\n",
225		     current->string);
226
227	return current->id;
228
229unknown:
230	plogdump(ASL_LEVEL_DEBUG, (char *)(gen + 1), vidlen, "received unknown Vendor ID:\n");
231	return (VENDORID_UNKNOWN);
232}
233
234static vchar_t *
235vendorid_fixup(vendorid, vidhash)
236	int vendorid;
237	vchar_t *vidhash;
238{
239	switch(vendorid) {
240	case VENDORID_XAUTH: {	/* The vendor Id is truncated */
241		vchar_t *tmp;
242
243		if ((tmp = vmalloc(8)) == NULL) {
244			plog(ASL_LEVEL_ERR,
245			    "unable to hash vendor ID string\n");
246			return NULL;
247		}
248
249		memcpy(tmp->v, vidhash->v, 8);
250		vfree(vidhash);
251		vidhash = tmp;
252
253		break;
254	}
255	case VENDORID_UNITY:	/* Two bytes tweak */
256		vidhash->v[14] = 0x01;
257		vidhash->v[15] = 0x00;
258		break;
259
260	default:
261		break;
262	}
263
264	return vidhash;
265}
266