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/* $OpenBSD: ike_aggressive.c,v 1.8 2004/07/29 08:54:08 ho Exp $ */
/* $EOM: ike_aggressive.c,v 1.4 2000/01/31 22:33:45 niklas Exp $ */
/*
* Copyright (c) 1999 Niklas Hallqvist. All rights reserved.
* Copyright (c) 1999 Angelos D. Keromytis. 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_aggressive.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"
#if defined (USE_NAT_TRAVERSAL)
#include "nat_traversal.h"
#endif
#include "prf.h"
#include "sa.h"
#include "transport.h"
#include "util.h"
static int initiator_recv_SA_KE_NONCE_ID_AUTH(struct message *);
static int initiator_send_SA_KE_NONCE_ID(struct message *);
static int initiator_send_AUTH(struct message *);
static int responder_recv_SA_KE_NONCE_ID(struct message *);
static int responder_send_SA_KE_NONCE_ID_AUTH(struct message *);
static int responder_recv_AUTH(struct message *);
int (*ike_aggressive_initiator[])(struct message *) = {
initiator_send_SA_KE_NONCE_ID,
initiator_recv_SA_KE_NONCE_ID_AUTH,
initiator_send_AUTH
};
int (*ike_aggressive_responder[])(struct message *) = {
responder_recv_SA_KE_NONCE_ID,
responder_send_SA_KE_NONCE_ID_AUTH,
responder_recv_AUTH
};
/* Offer a set of transforms to the responder in the MSG message. */
static int
initiator_send_SA_KE_NONCE_ID(struct message *msg)
{
if (ike_phase_1_initiator_send_SA(msg))
return -1;
if (ike_phase_1_initiator_send_KE_NONCE(msg))
return -1;
return ike_phase_1_send_ID(msg);
}
/* Figure out what transform the responder chose. */
static int
initiator_recv_SA_KE_NONCE_ID_AUTH(struct message *msg)
{
if (ike_phase_1_initiator_recv_SA(msg))
return -1;
if (ike_phase_1_initiator_recv_KE_NONCE(msg))
return -1;
return ike_phase_1_recv_ID_AUTH(msg);
}
static int
initiator_send_AUTH(struct message *msg)
{
msg->exchange->flags |= EXCHANGE_FLAG_ENCRYPT;
if (ike_phase_1_send_AUTH(msg))
return -1;
/*
* RFC 2407 4.6.3 says that, among others, INITIAL-CONTACT MUST NOT
* be sent in Aggressive Mode. This leaves us with the choice of
* doing it in an informational exchange of its own with no delivery
* guarantee or in the first Quick Mode, or not at all.
* draft-jenkins-ipsec-rekeying-01.txt has some text that requires
* INITIAL-CONTACT in phase 1, thus contradicting what we learned
* above. I will bring this up in the IPsec list. For now we don't
* do INITIAL-CONTACT at all when using aggressive mode.
*/
return 0;
}
/*
* Accept a set of transforms offered by the initiator and chose one we can
* handle. Also accept initiator's public DH value, nonce and ID.
*/
static int
responder_recv_SA_KE_NONCE_ID(struct message *msg)
{
if (ike_phase_1_responder_recv_SA(msg))
return -1;
if (ike_phase_1_recv_ID(msg))
return -1;
return ike_phase_1_recv_KE_NONCE(msg);
}
/*
* Reply with the transform we chose. Send our public DH value and a nonce
* to the initiator.
*/
static int
responder_send_SA_KE_NONCE_ID_AUTH(struct message *msg)
{
/* Add the SA payload with the transform that was chosen. */
if (ike_phase_1_responder_send_SA(msg))
return -1;
/* 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;
if (ike_phase_1_post_exchange_KE_NONCE(msg))
return -1;
return ike_phase_1_responder_send_ID_AUTH(msg);
}
/*
* Reply with the transform we chose. Send our public DH value and a nonce
* to the initiator.
*/
static int
responder_recv_AUTH(struct message *msg)
{
if (ike_phase_1_recv_AUTH(msg))
return -1;
#if defined (USE_NAT_TRAVERSAL)
/* Aggressive: Check for NAT-D payloads and contents. */
if (msg->exchange->flags & EXCHANGE_FLAG_NAT_T_CAP_PEER)
(void)nat_t_exchange_check_nat_d(msg);
#endif
return 0;
}
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