crypto/external/bsd/heimdal/dist/lib/krb5/rd_rep.c

   1 /*      $NetBSD: rd_rep.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $    */
   2
   3 /*
   4  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "krb5_locl.h"
  37
  38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  39 krb5_rd_rep(krb5_context context,
  40             krb5_auth_context auth_context,
  41             const krb5_data *inbuf,
  42             krb5_ap_rep_enc_part **repl)
  43 {
  44     krb5_error_code ret;
  45     AP_REP ap_rep;
  46     size_t len;
  47     krb5_data data;
  48     krb5_crypto crypto;
  49
  50     krb5_data_zero (&data);
  51
  52     ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len);
  53     if (ret)
  54         return ret;
  55     if (ap_rep.pvno != 5) {
  56         ret = KRB5KRB_AP_ERR_BADVERSION;
  57         krb5_clear_error_message (context);
  58         goto out;
  59     }
  60     if (ap_rep.msg_type != krb_ap_rep) {
  61         ret = KRB5KRB_AP_ERR_MSG_TYPE;
  62         krb5_clear_error_message (context);
  63         goto out;
  64     }
  65
  66     ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
  67     if (ret)
  68         goto out;
  69     ret = krb5_decrypt_EncryptedData (context,
  70                                       crypto,
  71                                       KRB5_KU_AP_REQ_ENC_PART,
  72                                       &ap_rep.enc_part,
  73                                       &data);
  74     krb5_crypto_destroy(context, crypto);
  75     if (ret)
  76         goto out;
  77
  78     *repl = malloc(sizeof(**repl));
  79     if (*repl == NULL) {
  80         ret = ENOMEM;
  81         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
  82         goto out;
  83     }
  84     ret = decode_EncAPRepPart(data.data, data.length, *repl, &len);
  85     if (ret) {
  86         krb5_set_error_message(context, ret, N_("Failed to decode EncAPRepPart", ""));
  87         return ret;
  88     }
  89
  90     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
  91         if ((*repl)->ctime != auth_context->authenticator->ctime ||
  92             (*repl)->cusec != auth_context->authenticator->cusec)
  93         {
  94             krb5_free_ap_rep_enc_part(context, *repl);
  95             *repl = NULL;
  96             ret = KRB5KRB_AP_ERR_MUT_FAIL;
  97             krb5_clear_error_message (context);
  98             goto out;
  99         }
 100     }
 101     if ((*repl)->seq_number)
 102         krb5_auth_con_setremoteseqnumber(context, auth_context,
 103                                          *((*repl)->seq_number));
 104     if ((*repl)->subkey)
 105         krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey);
 106
 107  out:
 108     krb5_data_free (&data);
 109     free_AP_REP (&ap_rep);
 110     return ret;
 111 }
 112
 113 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 114 krb5_free_ap_rep_enc_part (krb5_context context,
 115                            krb5_ap_rep_enc_part *val)
 116 {
 117     if (val) {
 118         free_EncAPRepPart (val);
 119         free (val);
 120     }
 121 }