racoon.tproj/vendorid.c

   1 /*      $KAME: vendorid.c,v 1.7 2000/12/15 13:43:57 sakane 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 <sys/types.h>
  33 #include <sys/param.h>
  34
  35 #include <stdlib.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <ctype.h>
  40
  41 #include "var.h"
  42 #include "misc.h"
  43 #include "vmbuf.h"
  44 #include "plog.h"
  45 #include "debug.h"
  46
  47 #include "localconf.h"
  48 #include "isakmp_var.h"
  49 #include "isakmp.h"
  50 #include "vendorid.h"
  51 #include "crypto_openssl.h"
  52
  53 const char *vendorid_strings[] = VENDORID_STRINGS;
  54
  55 /*
  56  * set hashed vendor id.
  57  * hash function is always MD5.
  58  */
  59 vchar_t *
  60 set_vendorid(int vendorid)
  61 {
  62         vchar_t vid, *vidhash;
  63
  64         if (vendorid == VENDORID_UNKNOWN) {
  65                 /*
  66                  * The default unknown ID gets translated to
  67                  * KAME/racoon.
  68                  */
  69                 vendorid = VENDORID_KAME;
  70         }
  71
  72         if (vendorid < 0 || vendorid >= NUMVENDORIDS) {
  73                 plog(LLV_ERROR, LOCATION, NULL,
  74                     "invalid vendor ID index: %d\n", vendorid);
  75                 return (NULL);
  76         }
  77
  78         /* XXX Cast away const. */
  79         vid.v = (char *) vendorid_strings[vendorid];
  80         vid.l = strlen(vendorid_strings[vendorid]);
  81
  82         vidhash = eay_md5_one(&vid);
  83         if (vidhash == NULL)
  84                 plog(LLV_ERROR, LOCATION, NULL,
  85                     "unable to hash vendor ID string\n");
  86
  87         return vidhash;
  88 }
  89
  90 /*
  91  * Check the vendor ID payload -- return the vendor ID index
  92  * if we find a recognized one, or UNKNOWN if we don't.
  93  */
  94 int
  95 check_vendorid(gen)
  96         struct isakmp_gen *gen;         /* points to Vendor ID payload */
  97 {
  98         vchar_t vid, *vidhash;
  99         int i, vidlen;
 100
 101         if (gen == NULL)
 102                 return (VENDORID_UNKNOWN);
 103
 104         vidlen = ntohs(gen->len) - sizeof(*gen);
 105
 106         for (i = 0; i < NUMVENDORIDS; i++) {
 107                 /* XXX Cast away const. */
 108                 vid.v = (char *) vendorid_strings[i];
 109                 vid.l = strlen(vendorid_strings[i]);
 110
 111                 vidhash = eay_md5_one(&vid);
 112                 if (vidhash == NULL) {
 113                         plog(LLV_ERROR, LOCATION, NULL,
 114                             "unable to hash vendor ID string\n");
 115                         return (VENDORID_UNKNOWN);
 116                 }
 117
 118                 /*
 119                  * XXX THIS IS NOT QUITE RIGHT!
 120                  *
 121                  * But we need to be able to recognize
 122                  * Windows 2000's ID, which is the MD5
 123                  * has of a known string + 4 bytes of
 124                  * what appears to be version info.
 125                  */
 126                 if (vidhash->l <= vidlen &&
 127                     memcmp(vidhash->v, gen + 1, vidhash->l) == 0) {
 128                         plog(LLV_INFO, LOCATION, NULL,
 129                             "received Vendor ID: %s\n",
 130                             vendorid_strings[i]);
 131                         vfree(vidhash);
 132                         return (i);
 133                 }
 134                 vfree(vidhash);
 135         }
 136
 137         plog(LLV_DEBUG, LOCATION, NULL, "received unknown Vendor ID\n");
 138         return (VENDORID_UNKNOWN);
 139 }