crypto/dist/ipsec-tools/src/racoon/vendorid.c

   1 /*      $NetBSD: vendorid.c,v 1.7 2009/03/12 10:57:26 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 }