ipsec-tools/racoon/vendorid.c

   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
  55 static 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
  84 const 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
  92 static vchar_t *vendorid_fixup(int, vchar_t *t);
  93
  94 static struct vendor_id *
  95 lookup_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
 106 const char *
 107 vid_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
 119 static struct vendor_id *
 120 lookup_vendor_id_by_hash (const char *hash)
 121 {
 122         int i;
 123         unsigned char *h = (unsigned char *)hash;
 124
 125         for (i = 0; i < NUMVENDORIDS; i++)
 126                 if (strncmp(all_vendor_ids[i].hash->v, hash,
 127                             all_vendor_ids[i].hash->l) == 0)
 128                         return &all_vendor_ids[i];
 129
 130         return NULL;
 131 }
 132
 133 void
 134 compute_vendorids (void)
 135 {
 136         int i;
 137         vchar_t vid;
 138
 139         for (i = 0; i < NUMVENDORIDS; i++) {
 140                 /* VENDORID_DPD is not a MD5 sum... */
 141                 if(i == VENDORID_DPD){
 142                         all_vendor_ids[i].hash = vmalloc(sizeof(vendorid_dpd_hash));
 143                         if (all_vendor_ids[i].hash == NULL) {
 144                                 plog(LLV_ERROR2, LOCATION, NULL,
 145                                         "unable to get memory for VID hash\n");
 146                                 exit(1); /* this really shouldn't happen */
 147                         }
 148                         memcpy(all_vendor_ids[i].hash->v, vendorid_dpd_hash,
 149                                    sizeof(vendorid_dpd_hash));
 150                         continue;
 151                 }
 152
 153                 vid.v = (char *) all_vendor_ids[i].string;
 154                 vid.l = strlen(vid.v);
 155
 156                 all_vendor_ids[i].hash = eay_md5_one(&vid);
 157                 if (all_vendor_ids[i].hash == NULL)
 158                         plog(LLV_ERROR, LOCATION, NULL,
 159                             "unable to hash vendor ID string\n");
 160
 161                 /* Special cases */
 162                 all_vendor_ids[i].hash =
 163                         vendorid_fixup(all_vendor_ids[i].id,
 164                                        all_vendor_ids[i].hash);
 165         }
 166 }
 167
 168 /*
 169  * set hashed vendor id.
 170  * hash function is always MD5.
 171  */
 172 vchar_t *
 173 set_vendorid(int vendorid)
 174 {
 175         struct vendor_id *current;
 176         vchar_t vid, *new;
 177
 178         if (vendorid == VENDORID_UNKNOWN) {
 179                 /*
 180                  * The default unknown ID gets translated to
 181                  * KAME/racoon.
 182                  */
 183                 vendorid = VENDORID_KAME;
 184         }
 185
 186         current = lookup_vendor_id_by_id(vendorid);
 187         if (current == NULL) {
 188                 plog(LLV_ERROR, LOCATION, NULL,
 189                     "invalid vendor ID index: %d\n", vendorid);
 190                 return (NULL);
 191         }
 192
 193         /* The rest of racoon expects a private copy
 194          * of the VID that could be free'd after use.
 195          * That's why we don't return the original pointer. */
 196         return vdup(current->hash);
 197 }
 198
 199 /*
 200  * Check the vendor ID payload -- return the vendor ID index
 201  * if we find a recognized one, or UNKNOWN if we don't.
 202  *
 203  * gen ... points to Vendor ID payload.
 204  */
 205 int
 206 check_vendorid(struct isakmp_gen *gen)
 207 {
 208         vchar_t vid, *vidhash;
 209         int i, vidlen;
 210         struct vendor_id *current;
 211
 212         if (gen == NULL)
 213                 return (VENDORID_UNKNOWN);
 214
 215         vidlen = ntohs(gen->len) - sizeof(*gen);
 216
 217         current = lookup_vendor_id_by_hash((char *)(gen + 1));
 218         if (!current)
 219                 goto unknown;
 220
 221         if (current->hash->l < vidlen)
 222                 plog(LLV_INFO, LOCATION, NULL,
 223                      "received broken Microsoft ID: %s\n",
 224                      current->string);
 225         else
 226                 plog(LLV_INFO, LOCATION, NULL,
 227                      "received Vendor ID: %s\n",
 228                      current->string);
 229
 230         return current->id;
 231
 232 unknown:
 233         plog(LLV_DEBUG, LOCATION, NULL, "received unknown Vendor ID:\n");
 234         plogdump(LLV_DEBUG, (char *)(gen + 1), vidlen);
 235         return (VENDORID_UNKNOWN);
 236 }
 237
 238 static vchar_t *
 239 vendorid_fixup(vendorid, vidhash)
 240         int vendorid;
 241         vchar_t *vidhash;
 242 {
 243         switch(vendorid) {
 244         case VENDORID_XAUTH: {  /* The vendor Id is truncated */
 245                 vchar_t *tmp;
 246
 247                 if ((tmp = vmalloc(8)) == NULL) {
 248                         plog(LLV_ERROR, LOCATION, NULL,
 249                             "unable to hash vendor ID string\n");
 250                         return NULL;
 251                 }
 252
 253                 memcpy(tmp->v, vidhash->v, 8);
 254                 vfree(vidhash);
 255                 vidhash = tmp;
 256
 257                 break;
 258         }
 259         case VENDORID_UNITY:    /* Two bytes tweak */
 260                 vidhash->v[14] = 0x01;
 261                 vidhash->v[15] = 0x00;
 262                 break;
 263
 264         default:
 265                 break;
 266         }
 267
 268         return vidhash;
 269 }