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 #ifdef __APPLE__
  71 { VENDORID_NATT_APPLE , "draft-ietf-ipsec-nat-t-ike" },
  72 #endif
  73 { VENDORID_NATT_RFC   , "RFC 3947" },
  74 { VENDORID_XAUTH      , "draft-ietf-ipsra-isakmp-xauth-06.txt" },
  75 { VENDORID_UNITY      , "CISCO-UNITY" },
  76 { VENDORID_FRAG       , "FRAGMENTATION" },
  77 /* Just a readable string for DPD ... */
  78 { VENDORID_DPD        , "DPD" },
  79 };
  80
  81 #define NUMVENDORIDS    (sizeof(all_vendor_ids)/sizeof(all_vendor_ids[0]))
  82
  83 #define DPD_MAJOR_VERSION       0x01
  84 #define DPD_MINOR_VERSION       0x00
  85
  86 const char vendorid_dpd_hash[] = {
  87         0xAF, 0xCA, 0xD7, 0x13,
  88         0x68, 0xA1, 0xF1, 0xC9,
  89         0x6B, 0x86, 0x96, 0xFC,
  90         0x77, 0x57, DPD_MAJOR_VERSION, DPD_MINOR_VERSION
  91 };
  92
  93
  94 static vchar_t *vendorid_fixup(int, vchar_t *t);
  95
  96 static struct vendor_id *
  97 lookup_vendor_id_by_id (int id)
  98 {
  99         int i;
 100
 101         for (i = 0; i < NUMVENDORIDS; i++)
 102                 if (all_vendor_ids[i].id == id)
 103                         return &all_vendor_ids[i];
 104
 105         return NULL;
 106 }
 107
 108 const char *
 109 vid_string_by_id (int id)
 110 {
 111         struct vendor_id *current;
 112
 113         if (id == VENDORID_DPD)
 114                 return vendorid_dpd_hash;
 115
 116         current = lookup_vendor_id_by_id(id);
 117
 118         return current ? current->string : NULL;
 119 }
 120
 121 static struct vendor_id *
 122 lookup_vendor_id_by_hash (const char *hash)
 123 {
 124         int i;
 125         unsigned char *h = (unsigned char *)hash;
 126
 127         for (i = 0; i < NUMVENDORIDS; i++)
 128                 if (strncmp(all_vendor_ids[i].hash->v, hash,
 129                             all_vendor_ids[i].hash->l) == 0)
 130                         return &all_vendor_ids[i];
 131
 132         return NULL;
 133 }
 134
 135 void
 136 compute_vendorids (void)
 137 {
 138         int i;
 139         vchar_t vid;
 140
 141         for (i = 0; i < NUMVENDORIDS; i++) {
 142                 /* VENDORID_DPD is not a MD5 sum... */
 143                 if(i == VENDORID_DPD){
 144                         all_vendor_ids[i].hash = vmalloc(sizeof(vendorid_dpd_hash));
 145                         if (all_vendor_ids[i].hash == NULL) {
 146                                 plog(LLV_ERROR2, LOCATION, NULL,
 147                                         "unable to get memory for VID hash\n");
 148                                 exit(1); /* this really shouldn't happen */
 149                         }
 150                         memcpy(all_vendor_ids[i].hash->v, vendorid_dpd_hash,
 151                                    sizeof(vendorid_dpd_hash));
 152                         continue;
 153                 }
 154
 155                 vid.v = (char *) all_vendor_ids[i].string;
 156                 vid.l = strlen(vid.v);
 157
 158                 all_vendor_ids[i].hash = eay_md5_one(&vid);
 159                 if (all_vendor_ids[i].hash == NULL)
 160                         plog(LLV_ERROR, LOCATION, NULL,
 161                             "unable to hash vendor ID string\n");
 162
 163                 /* Special cases */
 164                 all_vendor_ids[i].hash =
 165                         vendorid_fixup(all_vendor_ids[i].id,
 166                                        all_vendor_ids[i].hash);
 167         }
 168 }
 169
 170 /*
 171  * set hashed vendor id.
 172  * hash function is always MD5.
 173  */
 174 vchar_t *
 175 set_vendorid(int vendorid)
 176 {
 177         struct vendor_id *current;
 178         vchar_t vid, *new;
 179
 180         if (vendorid == VENDORID_UNKNOWN) {
 181                 /*
 182                  * The default unknown ID gets translated to
 183                  * KAME/racoon.
 184                  */
 185                 vendorid = VENDORID_KAME;
 186         }
 187
 188         current = lookup_vendor_id_by_id(vendorid);
 189         if (current == NULL) {
 190                 plog(LLV_ERROR, LOCATION, NULL,
 191                     "invalid vendor ID index: %d\n", vendorid);
 192                 return (NULL);
 193         }
 194
 195         /* The rest of racoon expects a private copy
 196          * of the VID that could be free'd after use.
 197          * That's why we don't return the original pointer. */
 198         return vdup(current->hash);
 199 }
 200
 201 /*
 202  * Check the vendor ID payload -- return the vendor ID index
 203  * if we find a recognized one, or UNKNOWN if we don't.
 204  *
 205  * gen ... points to Vendor ID payload.
 206  */
 207 int
 208 check_vendorid(struct isakmp_gen *gen)
 209 {
 210         vchar_t vid, *vidhash;
 211         int i, vidlen;
 212         struct vendor_id *current;
 213
 214         if (gen == NULL)
 215                 return (VENDORID_UNKNOWN);
 216
 217         vidlen = ntohs(gen->len) - sizeof(*gen);
 218
 219         current = lookup_vendor_id_by_hash((char *)(gen + 1));
 220         if (!current)
 221                 goto unknown;
 222
 223         if (current->hash->l < vidlen)
 224                 plog(LLV_INFO, LOCATION, NULL,
 225                      "received broken Microsoft ID: %s\n",
 226                      current->string);
 227         else
 228                 plog(LLV_INFO, LOCATION, NULL,
 229                      "received Vendor ID: %s\n",
 230                      current->string);
 231
 232         return current->id;
 233
 234 unknown:
 235         plog(LLV_DEBUG, LOCATION, NULL, "received unknown Vendor ID\n");
 236         return (VENDORID_UNKNOWN);
 237 }
 238
 239 static vchar_t *
 240 vendorid_fixup(vendorid, vidhash)
 241         int vendorid;
 242         vchar_t *vidhash;
 243 {
 244         switch(vendorid) {
 245         case VENDORID_XAUTH: {  /* The vendor Id is truncated */
 246                 vchar_t *tmp;
 247
 248                 if ((tmp = vmalloc(8)) == NULL) {
 249                         plog(LLV_ERROR, LOCATION, NULL,
 250                             "unable to hash vendor ID string\n");
 251                         return NULL;
 252                 }
 253
 254                 memcpy(tmp->v, vidhash->v, 8);
 255                 vfree(vidhash);
 256                 vidhash = tmp;
 257
 258                 break;
 259         }
 260         case VENDORID_UNITY:    /* Two bytes tweak */
 261                 vidhash->v[14] = 0x01;
 262                 vidhash->v[15] = 0x00;
 263                 break;
 264
 265         default:
 266                 break;
 267         }
 268
 269         return vidhash;
 270 }