keyexchange/isakmpd-20041012/ike_main_mode.c

   1 /* $OpenBSD: ike_main_mode.c,v 1.15 2004/06/14 09:55:41 ho Exp $         */
   2 /* $EOM: ike_main_mode.c,v 1.77 1999/04/25 22:12:34 niklas Exp $         */
   3
   4 /*
   5  * Copyright (c) 1998, 1999 Niklas Hallqvist.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 /*
  29  * This code was written under funding by Ericsson Radio Systems.
  30  */
  31
  32 #include <sys/types.h>
  33 #include <netinet/in.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "sysdep.h"
  38
  39 #include "attribute.h"
  40 #include "conf.h"
  41 #include "constants.h"
  42 #include "crypto.h"
  43 #include "dh.h"
  44 #include "doi.h"
  45 #include "exchange.h"
  46 #include "hash.h"
  47 #include "ike_auth.h"
  48 #include "ike_main_mode.h"
  49 #include "ike_phase_1.h"
  50 #include "ipsec.h"
  51 #include "ipsec_doi.h"
  52 #include "isakmp.h"
  53 #include "log.h"
  54 #include "math_group.h"
  55 #include "message.h"
  56 #include "prf.h"
  57 #include "sa.h"
  58 #include "transport.h"
  59 #include "util.h"
  60
  61 static int      initiator_send_ID_AUTH(struct message *);
  62 static int      responder_send_ID_AUTH(struct message *);
  63 static int      responder_send_KE_NONCE(struct message *);
  64
  65 int (*ike_main_mode_initiator[]) (struct message *) = {
  66         ike_phase_1_initiator_send_SA,
  67         ike_phase_1_initiator_recv_SA,
  68         ike_phase_1_initiator_send_KE_NONCE,
  69         ike_phase_1_initiator_recv_KE_NONCE,
  70         initiator_send_ID_AUTH,
  71         ike_phase_1_recv_ID_AUTH
  72 };
  73
  74 int (*ike_main_mode_responder[]) (struct message *) = {
  75         ike_phase_1_responder_recv_SA,
  76         ike_phase_1_responder_send_SA,
  77         ike_phase_1_recv_KE_NONCE,
  78         responder_send_KE_NONCE,
  79         ike_phase_1_recv_ID_AUTH,
  80         responder_send_ID_AUTH
  81 };
  82
  83 static int
  84 initiator_send_ID_AUTH(struct message *msg)
  85 {
  86         msg->exchange->flags |= EXCHANGE_FLAG_ENCRYPT;
  87
  88         if (ike_phase_1_send_ID(msg))
  89                 return -1;
  90
  91         if (ike_phase_1_send_AUTH(msg))
  92                 return -1;
  93
  94         return ipsec_initial_contact(msg);
  95 }
  96
  97 /* Send our public DH value and a nonce to the initiator.  */
  98 int
  99 responder_send_KE_NONCE(struct message *msg)
 100 {
 101         /* XXX Should we really just use the initiator's nonce size?  */
 102         if (ike_phase_1_send_KE_NONCE(msg, msg->exchange->nonce_i_len))
 103                 return -1;
 104
 105         /*
 106          * Calculate DH values & key material in parallel with the message
 107          * going on a roundtrip over the wire.
 108          */
 109         message_register_post_send(msg,
 110             (void (*)(struct message *))ike_phase_1_post_exchange_KE_NONCE);
 111
 112         return 0;
 113 }
 114
 115 static int
 116 responder_send_ID_AUTH(struct message *msg)
 117 {
 118         msg->exchange->flags |= EXCHANGE_FLAG_ENCRYPT;
 119
 120         if (ike_phase_1_responder_send_ID_AUTH(msg))
 121                 return -1;
 122
 123         return ipsec_initial_contact(msg);
 124 }