lib/krb5/rd_rep.c

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