Line data    Source code

       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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
      37       48403 : 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       48403 :     krb5_data_zero (&data);
      49             : 
      50       48403 :     ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len);
      51       48403 :     if (ret)
      52           0 :         return ret;
      53       48403 :     if (ap_rep.pvno != 5) {
      54           0 :         ret = KRB5KRB_AP_ERR_BADVERSION;
      55           0 :         krb5_clear_error_message (context);
      56           0 :         goto out;
      57             :     }
      58       48403 :     if (ap_rep.msg_type != krb_ap_rep) {
      59           0 :         ret = KRB5KRB_AP_ERR_MSG_TYPE;
      60           0 :         krb5_clear_error_message (context);
      61           0 :         goto out;
      62             :     }
      63             : 
      64       48403 :     ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
      65       48403 :     if (ret)
      66           0 :         goto out;
      67       48403 :     ret = krb5_decrypt_EncryptedData (context,
      68             :                                       crypto,
      69             :                                       KRB5_KU_AP_REQ_ENC_PART,
      70             :                                       &ap_rep.enc_part,
      71             :                                       &data);
      72       48403 :     krb5_crypto_destroy(context, crypto);
      73       48403 :     if (ret)
      74           0 :         goto out;
      75             : 
      76       48403 :     *repl = malloc(sizeof(**repl));
      77       48403 :     if (*repl == NULL) {
      78           0 :         ret = ENOMEM;
      79           0 :         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
      80           0 :         goto out;
      81             :     }
      82       48403 :     ret = decode_EncAPRepPart(data.data, data.length, *repl, &len);
      83       48403 :     if (ret) {
      84           0 :         krb5_set_error_message(context, ret, N_("Failed to decode EncAPRepPart", ""));
      85           0 :         return ret;
      86             :     }
      87             : 
      88       48403 :     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
      89       40570 :         if ((*repl)->ctime != auth_context->authenticator->ctime ||
      90       20285 :             (*repl)->cusec != auth_context->authenticator->cusec)
      91             :         {
      92           0 :             krb5_free_ap_rep_enc_part(context, *repl);
      93           0 :             *repl = NULL;
      94           0 :             ret = KRB5KRB_AP_ERR_MUT_FAIL;
      95           0 :             krb5_clear_error_message (context);
      96           0 :             goto out;
      97             :         }
      98             :     }
      99       48403 :     if ((*repl)->seq_number)
     100       48403 :         krb5_auth_con_setremoteseqnumber(context, auth_context,
     101       48403 :                                          *((*repl)->seq_number));
     102       48403 :     if ((*repl)->subkey)
     103       20285 :         krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey);
     104             : 
     105       76521 :  out:
     106       48403 :     krb5_data_free (&data);
     107       48403 :     free_AP_REP (&ap_rep);
     108       48403 :     return ret;
     109             : }
     110             : 
     111             : KRB5_LIB_FUNCTION void KRB5_LIB_CALL
     112       48403 : krb5_free_ap_rep_enc_part (krb5_context context,
     113             :                            krb5_ap_rep_enc_part *val)
     114             : {
     115       48403 :     if (val) {
     116       48403 :         free_EncAPRepPart (val);
     117       48403 :         free (val);
     118             :     }
     119       48403 : }