lib/krb5/rd_rep.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 <krb5_locl.h>
  40
  41 RCSID("$Id$");
  42
  43 krb5_error_code
  44 krb5_rd_rep(krb5_context context,
  45             krb5_auth_context auth_context,
  46             const krb5_data *inbuf,
  47             krb5_ap_rep_enc_part **repl)
  48 {
  49   krb5_error_code ret;
  50   AP_REP ap_rep;
  51   size_t len;
  52   krb5_data data;
  53
  54   krb5_data_zero (&data);
  55   ret = 0;
  56
  57   ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len);
  58   if (ret)
  59       return ret;
  60   if (ap_rep.pvno != 5) {
  61     ret = KRB5KRB_AP_ERR_BADVERSION;
  62     goto out;
  63   }
  64   if (ap_rep.msg_type != krb_ap_rep) {
  65     ret = KRB5KRB_AP_ERR_MSG_TYPE;
  66     goto out;
  67   }
  68
  69   ret = krb5_decrypt (context,
  70                       ap_rep.enc_part.cipher.data,
  71                       ap_rep.enc_part.cipher.length,
  72                       ap_rep.enc_part.etype,
  73                       auth_context->keyblock,
  74                       &data);
  75   if (ret)
  76       goto out;
  77
  78   *repl = malloc(sizeof(**repl));
  79   if (*repl == NULL) {
  80     ret = ENOMEM;
  81     goto out;
  82   }
  83   ret = decode_EncAPRepPart(data.data,
  84                             data.length,
  85                             *repl,
  86                             &len);
  87   if (ret)
  88       return ret;
  89   if ((*repl)->ctime != auth_context->authenticator->ctime ||
  90       (*repl)->cusec != auth_context->authenticator->cusec) {
  91     ret = KRB5KRB_AP_ERR_MUT_FAIL;
  92     goto out;
  93   }
  94   if ((*repl)->seq_number)
  95     auth_context->remote_seqnumber = *((*repl)->seq_number);
  96
  97 out:
  98   krb5_data_free (&data);
  99   free_AP_REP (&ap_rep);
 100   return ret;
 101 }
 102
 103 void
 104 krb5_free_ap_rep_enc_part (krb5_context context,
 105                            krb5_ap_rep_enc_part *val)
 106 {
 107     free_EncAPRepPart (val);
 108     free (val);
 109 }