lib/gssapi/krb5/8003.c

   1 /*
   2  * Copyright (c) 1997 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include "gssapi_locl.h"
  40
  41 RCSID("$Id$");
  42
  43 static krb5_error_code
  44 encode_om_uint32(OM_uint32 n, u_char *p)
  45 {
  46   p[0] = (n >> 0)  & 0xFF;
  47   p[1] = (n >> 8)  & 0xFF;
  48   p[2] = (n >> 16) & 0xFF;
  49   p[3] = (n >> 24) & 0xFF;
  50   return 0;
  51 }
  52
  53 static krb5_error_code
  54 hash_input_chan_bindings (const gss_channel_bindings_t b,
  55                           u_char *p)
  56 {
  57   u_char num[4];
  58   struct md5 md5;
  59
  60   md5_init(&md5);
  61   encode_om_uint32 (b->initiator_addrtype, num);
  62   md5_update (&md5, num, sizeof(num));
  63   encode_om_uint32 (b->initiator_address.length, num);
  64   md5_update (&md5, num, sizeof(num));
  65   if (b->initiator_address.length)
  66     md5_update (&md5,
  67                 b->initiator_address.value,
  68                 b->initiator_address.length);
  69   encode_om_uint32 (b->acceptor_addrtype, num);
  70   md5_update (&md5, num, sizeof(num));
  71   encode_om_uint32 (b->acceptor_address.length, num);
  72   md5_update (&md5, num, sizeof(num));
  73   if (b->acceptor_address.length)
  74     md5_update (&md5,
  75                 b->acceptor_address.value,
  76                 b->acceptor_address.length);
  77   encode_om_uint32 (b->application_data.length, num);
  78   md5_update (&md5, num, sizeof(num));
  79   if (b->application_data.length)
  80     md5_update (&md5,
  81                 b->application_data.value,
  82                 b->application_data.length);
  83   md5_finito (&md5, p);
  84   return 0;
  85 }
  86
  87 krb5_error_code
  88 gssapi_krb5_create_8003_checksum (
  89                       const gss_channel_bindings_t input_chan_bindings,
  90                       OM_uint32 flags,
  91                       Checksum *result)
  92 {
  93   u_char *p;
  94
  95   result->cksumtype = 0x8003;
  96   result->checksum.length = 24;
  97   result->checksum.data   = malloc (result->checksum.length);
  98   if (result->checksum.data == NULL)
  99     return ENOMEM;
 100
 101   p = result->checksum.data;
 102   encode_om_uint32 (16, p);
 103   p += 4;
 104   if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
 105     memset (p, 0, 16);
 106   } else {
 107     hash_input_chan_bindings (input_chan_bindings, p);
 108   }
 109   p += 16;
 110   encode_om_uint32 (flags, p);
 111   p += 4;
 112   if (p - (u_char *)result->checksum.data != result->checksum.length)
 113     abort ();
 114   return 0;
 115 }
 116