/*	$OpenBSD: ike_main_mode.c,v 1.12 2003/06/03 14:28:16 ho Exp $	*/
/*	$EOM: ike_main_mode.c,v 1.77 1999/04/25 22:12:34 niklas Exp $	*/

/*
 * Copyright (c) 1998, 1999 Niklas Hallqvist.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>

#include "sysdep.h"

#include "attribute.h"
#include "conf.h"
#include "constants.h"
#include "crypto.h"
#include "dh.h"
#include "doi.h"
#include "exchange.h"
#include "hash.h"
#include "ike_auth.h"
#include "ike_main_mode.h"
#include "ike_phase_1.h"
#include "ipsec.h"
#include "ipsec_doi.h"
#include "isakmp.h"
#include "log.h"
#include "math_group.h"
#include "message.h"
#include "prf.h"
#include "sa.h"
#include "transport.h"
#include "util.h"

static int initiator_send_ID_AUTH (struct message *);
static int responder_send_ID_AUTH (struct message *);
static int responder_send_KE_NONCE (struct message *);

int (*ike_main_mode_initiator[]) (struct message *) = {
  ike_phase_1_initiator_send_SA,
  ike_phase_1_initiator_recv_SA,
  ike_phase_1_initiator_send_KE_NONCE,
  ike_phase_1_initiator_recv_KE_NONCE,
  initiator_send_ID_AUTH,
  ike_phase_1_recv_ID_AUTH
};

int (*ike_main_mode_responder[]) (struct message *) = {
  ike_phase_1_responder_recv_SA,
  ike_phase_1_responder_send_SA,
  ike_phase_1_recv_KE_NONCE,
  responder_send_KE_NONCE,
  ike_phase_1_recv_ID_AUTH,
  responder_send_ID_AUTH
};

static int
initiator_send_ID_AUTH (struct message *msg)
{
  msg->exchange->flags |= EXCHANGE_FLAG_ENCRYPT;

  if (ike_phase_1_send_ID (msg))
    return -1;

  if (ike_phase_1_send_AUTH (msg))
    return -1;

  return ipsec_initial_contact (msg);
}

/* Send our public DH value and a nonce to the initiator.  */
int
responder_send_KE_NONCE (struct message *msg)
{
  /* XXX Should we really just use the initiator's nonce size?  */
  if (ike_phase_1_send_KE_NONCE (msg, msg->exchange->nonce_i_len))
    return -1;

  /*
   * Calculate DH values & key material in parallel with the message going
   * on a roundtrip over the wire.
   */
  message_register_post_send (msg,
			      (void (*) (struct message *))
			      ike_phase_1_post_exchange_KE_NONCE);

  return 0;
}

static int
responder_send_ID_AUTH (struct message *msg)
{
  msg->exchange->flags |= EXCHANGE_FLAG_ENCRYPT;

  if (ike_phase_1_responder_send_ID_AUTH (msg))
    return -1;

  return ipsec_initial_contact (msg);
}