xref: /freebsd/crypto/heimdal/lib/krb5/rd_rep.c (revision 4137ff4cc173ea2e05227027e1c9e0ea42bcc0dc)

/*
 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <krb5_locl.h>

RCSID("$Id: rd_rep.c,v 1.22 2001/06/18 02:46:53 assar Exp $");

krb5_error_code
krb5_rd_rep(krb5_context context,
	    krb5_auth_context auth_context,
	    const krb5_data *inbuf,
	    krb5_ap_rep_enc_part **repl)
{
  krb5_error_code ret;
  AP_REP ap_rep;
  size_t len;
  krb5_data data;
  krb5_crypto crypto;

  krb5_data_zero (&data);
  ret = 0;

  ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len);
  if (ret)
      return ret;
  if (ap_rep.pvno != 5) {
    ret = KRB5KRB_AP_ERR_BADVERSION;
    krb5_clear_error_string (context);
    goto out;
  }
  if (ap_rep.msg_type != krb_ap_rep) {
    ret = KRB5KRB_AP_ERR_MSG_TYPE;
    krb5_clear_error_string (context);
    goto out;
  }

  ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
  if (ret)
      goto out;
  ret = krb5_decrypt_EncryptedData (context,
				    crypto,
				    KRB5_KU_AP_REQ_ENC_PART,
				    &ap_rep.enc_part,
				    &data);
  krb5_crypto_destroy(context, crypto);
  if (ret)
      goto out;

  *repl = malloc(sizeof(**repl));
  if (*repl == NULL) {
    ret = ENOMEM;
    krb5_set_error_string (context, "malloc: out of memory");
    goto out;
  }
  ret = krb5_decode_EncAPRepPart(context,
				 data.data,
				 data.length,
				 *repl,
				 &len);
  if (ret)
      return ret;

  if ((*repl)->ctime != auth_context->authenticator->ctime ||
      (*repl)->cusec != auth_context->authenticator->cusec) {
    ret = KRB5KRB_AP_ERR_MUT_FAIL;
    krb5_clear_error_string (context);
    goto out;
  }
  if ((*repl)->seq_number)
      krb5_auth_con_setremoteseqnumber(context, auth_context,
				       *((*repl)->seq_number));
  if ((*repl)->subkey)
    krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey);

out:
  krb5_data_free (&data);
  free_AP_REP (&ap_rep);
  return ret;
}

void
krb5_free_ap_rep_enc_part (krb5_context context,
			   krb5_ap_rep_enc_part *val)
{
    free_EncAPRepPart (val);
    free (val);
}