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isakmp_ident.c

/* $Id: isakmp_ident.c,v 1.12.2.3 2005/01/26 19:39:26 vanhu Exp $ */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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 project 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 PROJECT 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 PROJECT 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.
 */

/* Identity Protecion Exchange (Main Mode) */

#include "config.h"

#include <sys/types.h>
#include <sys/param.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#include "var.h"
#include "misc.h"
#include "vmbuf.h"
#include "plog.h"
#include "sockmisc.h"
#include "schedule.h"
#include "debug.h"

#include "localconf.h"
#include "remoteconf.h"
#include "isakmp_var.h"
#include "isakmp.h"
#include "evt.h"
#include "oakley.h"
#include "handler.h"
#include "ipsec_doi.h"
#include "crypto_openssl.h"
#include "pfkey.h"
#include "isakmp_ident.h"
#include "isakmp_inf.h"
#include "vendorid.h"

#ifdef ENABLE_NATT
#include "nattraversal.h"
#endif
#ifdef HAVE_GSSAPI
#include "gssapi.h"
#endif

static vchar_t *ident_ir2mx __P((struct ph1handle *));
static vchar_t *ident_ir3mx __P((struct ph1handle *));

/* %%%
 * begin Identity Protection Mode as initiator.
 */
/*
 * send to responder
 *    psk: HDR, SA
 *    sig: HDR, SA
 *    rsa: HDR, SA
 *    rev: HDR, SA
 */
int
ident_i1send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg; /* must be null */
{
      struct payload_list *plist = NULL;
      int error = -1;
#ifdef ENABLE_NATT
      vchar_t *vid_natt[MAX_NATT_VID_COUNT];
      int i;
#endif
#ifdef ENABLE_DPD
      vchar_t *vid_dpd = NULL;
#endif
      /* validity check */
      if (msg != NULL) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "msg has to be NULL in this function.\n");
            goto end;
      }
      if (iph1->status != PHASE1ST_START) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* create isakmp index */
      memset(&iph1->index, 0, sizeof(iph1->index));
      isakmp_newcookie((caddr_t)&iph1->index, iph1->remote, iph1->local);

      /* create SA payload for my proposal */
      iph1->sa = ipsecdoi_setph1proposal(iph1->rmconf->proposal);
      if (iph1->sa == NULL)
            goto end;

      /* set SA payload to propose */
      plist = isakmp_plist_append(plist, iph1->sa, ISAKMP_NPTYPE_SA);

#ifdef ENABLE_NATT
      /* set VID payload for NAT-T if NAT-T support allowed in the config file */
      if (iph1->rmconf->nat_traversal) 
            plist = isakmp_plist_append_natt_vids(plist, vid_natt);
      else
            vid_natt[0]=NULL;
#endif
#ifdef ENABLE_DPD
      if(iph1->rmconf->dpd){
            vid_dpd = set_vendorid(VENDORID_DPD);
            if (vid_dpd != NULL)
                  plist = isakmp_plist_append(plist, vid_dpd,
                                                            ISAKMP_NPTYPE_VID);
      }
#endif

      iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);

#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
#endif

      /* send the packet, add to the schedule to resend */
      iph1->retry_counter = iph1->rmconf->retry_counter;
      if (isakmp_ph1resend(iph1) == -1)
            goto end;

      iph1->status = PHASE1ST_MSG1SENT;

      error = 0;

end:
#ifdef ENABLE_NATT
      for (i = 0; i < MAX_NATT_VID_COUNT && vid_natt[i] != NULL; i++)
            vfree(vid_natt[i]);
#endif
#ifdef ENABLE_DPD
      if (vid_dpd != NULL)
            vfree(vid_dpd);
#endif

      return error;
}

/*
 * receive from responder
 *    psk: HDR, SA
 *    sig: HDR, SA
 *    rsa: HDR, SA
 *    rev: HDR, SA
 */
int
ident_i2recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      vchar_t *satmp = NULL;
      int error = -1;
      int vid_numeric;

      /* validity check */
      if (iph1->status != PHASE1ST_MSG1SENT) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* validate the type of next payload */
      /*
       * NOTE: RedCreek(as responder) attaches N[responder-lifetime] here,
       *    if proposal-lifetime > lifetime-redcreek-wants.
       *    (see doi-08 4.5.4)
       *    => According to the seciton 4.6.3 in RFC 2407, This is illegal.
       * NOTE: we do not really care about ordering of VID and N.
       *    does it matters?
       * NOTE: even if there's multiple VID/N, we'll ignore them.
       */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;
      pa = (struct isakmp_parse_t *)pbuf->v;

      /* SA payload is fixed postion */
      if (pa->type != ISAKMP_NPTYPE_SA) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "received invalid next payload type %d, "
                  "expecting %d.\n",
                  pa->type, ISAKMP_NPTYPE_SA);
            goto end;
      }
      if (isakmp_p2ph(&satmp, pa->ptr) < 0)
            goto end;
      pa++;

      for (/*nothing*/;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {

            switch (pa->type) {
            case ISAKMP_NPTYPE_VID:
                  vid_numeric = check_vendorid(pa->ptr);
#ifdef ENABLE_NATT
                  if (iph1->rmconf->nat_traversal && natt_vendorid(vid_numeric))
                    natt_handle_vendorid(iph1, vid_numeric);
#endif
#ifdef ENABLE_DPD
                  if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd)
                        iph1->dpd_support=1;
#endif
                  break;
            default:
                  /* don't send information, see ident_r1recv() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

#ifdef ENABLE_NATT
      if (NATT_AVAILABLE(iph1))
            plog(LLV_INFO, LOCATION, iph1->remote,
                 "Selected NAT-T version: %s\n",
                 vid_string_by_id(iph1->natt_options->version));
#endif

      /* check SA payload and set approval SA for use */
      if (ipsecdoi_checkph1proposal(satmp, iph1) < 0) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "failed to get valid proposal.\n");
            /* XXX send information */
            goto end;
      }
      VPTRINIT(iph1->sa_ret);

      iph1->status = PHASE1ST_MSG2RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (satmp)
            vfree(satmp);
      return error;
}

/*
 * send to responder
 *    psk: HDR, KE, Ni
 *    sig: HDR, KE, Ni
 *   gssapi: HDR, KE, Ni, GSSi
 *    rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
 *    rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
 *              <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
 */
int
ident_i2send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;

      /* validity check */
      if (iph1->status != PHASE1ST_MSG2RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* fix isakmp index */
      memcpy(&iph1->index.r_ck, &((struct isakmp *)msg->v)->r_ck,
            sizeof(cookie_t));

      /* generate DH public value */
      if (oakley_dh_generate(iph1->approval->dhgrp,
                        &iph1->dhpub, &iph1->dhpriv) < 0)
            goto end;

      /* generate NONCE value */
      iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
      if (iph1->nonce == NULL)
            goto end;

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
          gssapi_get_itoken(iph1, NULL) < 0)
            goto end;
#endif

      /* create buffer to send isakmp payload */
      iph1->sendbuf = ident_ir2mx(iph1);
      if (iph1->sendbuf == NULL)
            goto end;

#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
#endif

      /* send the packet, add to the schedule to resend */
      iph1->retry_counter = iph1->rmconf->retry_counter;
      if (isakmp_ph1resend(iph1) == -1)
            goto end;

      /* the sending message is added to the received-list. */
      if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
            plog(LLV_ERROR , LOCATION, NULL,
                  "failed to add a response packet to the tree.\n");
            goto end;
      }

      iph1->status = PHASE1ST_MSG2SENT;

      error = 0;

end:
      return error;
}

/*
 * receive from responder
 *    psk: HDR, KE, Nr
 *    sig: HDR, KE, Nr [, CR ]
 *   gssapi: HDR, KE, Nr, GSSr
 *    rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
 *    rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
 */
int
ident_i3recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif
#ifdef ENABLE_NATT
      vchar_t     *natd_received;
      int natd_seq = 0, natd_verified;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG2SENT) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* validate the type of next payload */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;

      for (pa = (struct isakmp_parse_t *)pbuf->v;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {

            switch (pa->type) {
            case ISAKMP_NPTYPE_KE:
                  if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_NONCE:
                  if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;
            case ISAKMP_NPTYPE_CR:
                  if (oakley_savecr(iph1, pa->ptr) < 0)
                        goto end;
                  break;
#ifdef HAVE_GSSAPI
            case ISAKMP_NPTYPE_GSS:
                  if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
                        goto end;
                  gssapi_save_received_token(iph1, gsstoken);
                  break;
#endif

#ifdef ENABLE_NATT
            case ISAKMP_NPTYPE_NATD_DRAFT:
            case ISAKMP_NPTYPE_NATD_RFC:
                  if (NATT_AVAILABLE(iph1) && iph1->natt_options &&
                      pa->type == iph1->natt_options->payload_nat_d) {
                        natd_received = NULL;
                        if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
                              goto end;
                        
                        /* set both bits first so that we can clear them
                           upon verifying hashes */
                        if (natd_seq == 0)
                              iph1->natt_flags |= NAT_DETECTED;
                        
                        /* this function will clear appropriate bits bits 
                           from iph1->natt_flags */
                        natd_verified = natt_compare_addr_hash (iph1,
                              natd_received, natd_seq++);
                        
                        plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
                              natd_seq - 1,
                              natd_verified ? "verified" : "doesn't match");
                        
                        vfree (natd_received);
                        break;
                  }
                  /* passthrough to default... */
#endif

            default:
                  /* don't send information, see ident_r1recv() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

#ifdef ENABLE_NATT
      if (NATT_AVAILABLE(iph1)) {
            plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
                  iph1->natt_flags & NAT_DETECTED ? 
                              "detected:" : "not detected",
                  iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
                  iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
            if (iph1->natt_flags & NAT_DETECTED)
                  natt_float_ports (iph1);
      }
#endif

      /* payload existency check */
      if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "few isakmp message received.\n");
            goto end;
      }

      if (oakley_checkcr(iph1) < 0) {
            /* Ignore this error in order to be interoperability. */
            ;
      }

      iph1->status = PHASE1ST_MSG3RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (error) {
            VPTRINIT(iph1->dhpub_p);
            VPTRINIT(iph1->nonce_p);
            VPTRINIT(iph1->id_p);
            oakley_delcert(iph1->cr_p);
            iph1->cr_p = NULL;
      }

      return error;
}

/*
 * send to responder
 *    psk: HDR*, IDi1, HASH_I
 *    sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
 *   gssapi: HDR*, IDi1, < Gssi(n) | HASH_I >
 *    rsa: HDR*, HASH_I
 *    rev: HDR*, HASH_I
 */
int
ident_i3send(iph1, msg0)
      struct ph1handle *iph1;
      vchar_t *msg0;
{
      int error = -1;
      int dohash = 1;
#ifdef HAVE_GSSAPI
      int len;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG3RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* compute sharing secret of DH */
      if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
                        iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
            goto end;

      /* generate SKEYIDs & IV & final cipher key */
      if (oakley_skeyid(iph1) < 0)
            goto end;
      if (oakley_skeyid_dae(iph1) < 0)
            goto end;
      if (oakley_compute_enckey(iph1) < 0)
            goto end;
      if (oakley_newiv(iph1) < 0)
            goto end;

      /* make ID payload into isakmp status */
      if (ipsecdoi_setid1(iph1) < 0)
            goto end;

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
          gssapi_more_tokens(iph1)) {
            plog(LLV_DEBUG, LOCATION, NULL, "calling get_itoken\n");
            if (gssapi_get_itoken(iph1, &len) < 0)
                  goto end;
            if (len != 0)
                  dohash = 0;
      }
#endif

      /* generate HASH to send */
      if (dohash) {
            iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
            if (iph1->hash == NULL)
                  goto end;
      } else
            iph1->hash = NULL;

      /* set encryption flag */
      iph1->flags |= ISAKMP_FLAG_E;

      /* create HDR;ID;HASH payload */
      iph1->sendbuf = ident_ir3mx(iph1);
      if (iph1->sendbuf == NULL)
            goto end;

      /* send the packet, add to the schedule to resend */
      iph1->retry_counter = iph1->rmconf->retry_counter;
      if (isakmp_ph1resend(iph1) == -1)
            goto end;

      /* the sending message is added to the received-list. */
      if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg0) == -1) {
            plog(LLV_ERROR , LOCATION, NULL,
                  "failed to add a response packet to the tree.\n");
            goto end;
      }

      /* see handler.h about IV synchronization. */
      memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);

      iph1->status = PHASE1ST_MSG3SENT;

      error = 0;

end:
      return error;
}

/*
 * receive from responder
 *    psk: HDR*, IDr1, HASH_R
 *    sig: HDR*, IDr1, [ CERT, ] SIG_R
 *   gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
 *    rsa: HDR*, HASH_R
 *    rev: HDR*, HASH_R
 */
int
ident_i4recv(iph1, msg0)
      struct ph1handle *iph1;
      vchar_t *msg0;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      vchar_t *msg = NULL;
      int error = -1;
      int type;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG3SENT) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* decrypting */
      if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "ignore the packet, "
                  "expecting the packet encrypted.\n");
            goto end;
      }
      msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
      if (msg == NULL)
            goto end;

      /* validate the type of next payload */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;

      iph1->pl_hash = NULL;

      for (pa = (struct isakmp_parse_t *)pbuf->v;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {

            switch (pa->type) {
            case ISAKMP_NPTYPE_ID:
                  if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_HASH:
                  iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
                  break;
            case ISAKMP_NPTYPE_CERT:
                  if (oakley_savecert(iph1, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_SIG:
                  if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
                        goto end;
                  break;
#ifdef HAVE_GSSAPI
            case ISAKMP_NPTYPE_GSS:
                  if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
                        goto end;
                  gssapi_save_received_token(iph1, gsstoken);
                  break;
#endif
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;
            case ISAKMP_NPTYPE_N:
                  isakmp_check_notify(pa->ptr, iph1);
                  break;
            default:
                  /* don't send information, see ident_r1recv() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

      /* payload existency check */

      /* verify identifier */
      if (ipsecdoi_checkid1(iph1) != 0) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "invalid ID payload.\n");
            goto end;
      }

      /* validate authentication value */
#ifdef HAVE_GSSAPI
      if (gsstoken == NULL) {
#endif
            type = oakley_validate_auth(iph1);
            if (type != 0) {
                  if (type == -1) {
                        /* msg printed inner oakley_validate_auth() */
                        goto end;
                  }
                  EVT_PUSH(iph1->local, iph1->remote, 
                      EVTT_PEERPH1AUTH_FAILED, NULL);
                  isakmp_info_send_n1(iph1, type, NULL);
                  goto end;
            }
#ifdef HAVE_GSSAPI
      }
#endif

      /*
       * XXX: Should we do compare two addresses, ph1handle's and ID
       * payload's.
       */

      plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID:");
      plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);

      /* see handler.h about IV synchronization. */
      memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);

      /*
       * If we got a GSS token, we need to this roundtrip again.
       */
#ifdef HAVE_GSSAPI
      iph1->status = gsstoken != 0 ? PHASE1ST_MSG3RECEIVED : 
          PHASE1ST_MSG4RECEIVED;
#else
      iph1->status = PHASE1ST_MSG4RECEIVED;
#endif

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (msg)
            vfree(msg);
#ifdef HAVE_GSSAPI
      if (gsstoken)
            vfree(gsstoken);
#endif

      if (error) {
            VPTRINIT(iph1->id_p);
            oakley_delcert(iph1->cert_p);
            iph1->cert_p = NULL;
            oakley_delcert(iph1->crl_p);
            iph1->crl_p = NULL;
            VPTRINIT(iph1->sig_p);
      }

      return error;
}

/*
 * status update and establish isakmp sa.
 */
int
ident_i4send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;

      /* validity check */
      if (iph1->status != PHASE1ST_MSG4RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* see handler.h about IV synchronization. */
      memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->iv->l);

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

end:
      return error;
}

/*
 * receive from initiator
 *    psk: HDR, SA
 *    sig: HDR, SA
 *    rsa: HDR, SA
 *    rev: HDR, SA
 */
int
ident_r1recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
      int vid_numeric;

      /* validity check */
      if (iph1->status != PHASE1ST_START) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* validate the type of next payload */
      /*
       * NOTE: XXX even if multiple VID, we'll silently ignore those.
       */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;
      pa = (struct isakmp_parse_t *)pbuf->v;

      /* check the position of SA payload */
      if (pa->type != ISAKMP_NPTYPE_SA) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "received invalid next payload type %d, "
                  "expecting %d.\n",
                  pa->type, ISAKMP_NPTYPE_SA);
            goto end;
      }
      if (isakmp_p2ph(&iph1->sa, pa->ptr) < 0)
            goto end;
      pa++;

      for (/*nothing*/;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {

            switch (pa->type) {
            case ISAKMP_NPTYPE_VID:
                  vid_numeric = check_vendorid(pa->ptr);
#ifdef ENABLE_NATT
                  if (iph1->rmconf->nat_traversal && natt_vendorid(vid_numeric))
                        natt_handle_vendorid(iph1, vid_numeric);
#endif
#ifdef ENABLE_DPD
                  if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd)
                        iph1->dpd_support=1;
#endif
                  break;
            default:
                  /*
                   * We don't send information to the peer even
                   * if we received malformed packet.  Because we
                   * can't distinguish the malformed packet and
                   * the re-sent packet.  And we do same behavior
                   * when we expect encrypted packet.
                   */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

#ifdef ENABLE_NATT
      if (NATT_AVAILABLE(iph1))
            plog(LLV_INFO, LOCATION, iph1->remote,
                 "Selected NAT-T version: %s\n",
                 vid_string_by_id(iph1->natt_options->version));
#endif

      /* check SA payload and set approval SA for use */
      if (ipsecdoi_checkph1proposal(iph1->sa, iph1) < 0) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "failed to get valid proposal.\n");
            /* XXX send information */
            goto end;
      }

      iph1->status = PHASE1ST_MSG1RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (error) {
            VPTRINIT(iph1->sa);
      }

      return error;
}

/*
 * send to initiator
 *    psk: HDR, SA
 *    sig: HDR, SA
 *    rsa: HDR, SA
 *    rev: HDR, SA
 */
int
ident_r1send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      int error = -1;
      vchar_t *gss_sa = NULL;
      vchar_t *vid = NULL;
#ifdef ENABLE_NATT
      vchar_t *vid_natt = NULL;
#endif
#ifdef ENABLE_DPD
      vchar_t *vid_dpd = NULL;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG1RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* set responder's cookie */
      isakmp_newcookie((caddr_t)&iph1->index.r_ck, iph1->remote, iph1->local);

#ifdef HAVE_GSSAPI
      if (iph1->approval->gssid != NULL)
            gss_sa = ipsecdoi_setph1proposal(iph1->approval);
      else
#endif
            gss_sa = iph1->sa_ret;

      /* set SA payload to reply */
      plist = isakmp_plist_append(plist, gss_sa, ISAKMP_NPTYPE_SA);

      /* Set Vendor ID, if necessary. */
      if (vid)
            plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);

#ifdef ENABLE_NATT
      /* Has the peer announced NAT-T? */
      if (NATT_AVAILABLE(iph1))
            vid_natt = set_vendorid(iph1->natt_options->version);

      if (vid_natt)
            plist = isakmp_plist_append(plist, vid_natt, ISAKMP_NPTYPE_VID);
#endif
#ifdef ENABLE_DPD
      /* XXX only send DPD VID if remote sent it ? */
      if(iph1->rmconf->dpd){
            vid_dpd = set_vendorid(VENDORID_DPD);
            if (vid_dpd != NULL)
                  plist = isakmp_plist_append(plist, vid_dpd, ISAKMP_NPTYPE_VID);
      }
#endif

      iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);

#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
#endif

      /* send the packet, add to the schedule to resend */
      iph1->retry_counter = iph1->rmconf->retry_counter;
      if (isakmp_ph1resend(iph1) == -1)
            goto end;

      /* the sending message is added to the received-list. */
      if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
            plog(LLV_ERROR , LOCATION, NULL,
                  "failed to add a response packet to the tree.\n");
            goto end;
      }

      iph1->status = PHASE1ST_MSG1SENT;

      error = 0;

end:
#ifdef HAVE_GSSAPI
      if (gss_sa != iph1->sa_ret)
            vfree(gss_sa);
#endif
      if (vid)
            vfree(vid);

#ifdef ENABLE_NATT
      if (vid_natt)
            vfree(vid_natt);
#endif
#ifdef ENABLE_DPD
      if (vid_dpd != NULL)
            vfree(vid_dpd);
#endif

      return error;
}

/*
 * receive from initiator
 *    psk: HDR, KE, Ni
 *    sig: HDR, KE, Ni
 *   gssapi: HDR, KE, Ni, GSSi
 *    rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
 *    rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
 *              <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
 */
int
ident_r2recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif
#ifdef ENABLE_NATT
      int natd_seq = 0;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG1SENT) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* validate the type of next payload */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;

      for (pa = (struct isakmp_parse_t *)pbuf->v;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {
            switch (pa->type) {
            case ISAKMP_NPTYPE_KE:
                  if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_NONCE:
                  if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;
            case ISAKMP_NPTYPE_CR:
                  plog(LLV_WARNING, LOCATION, iph1->remote,
                        "CR received, ignore it. "
                        "It should be in other exchange.\n");
                  break;
#ifdef HAVE_GSSAPI
            case ISAKMP_NPTYPE_GSS:
                  if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
                        goto end;
                  gssapi_save_received_token(iph1, gsstoken);
                  break;
#endif

#ifdef ENABLE_NATT
            case ISAKMP_NPTYPE_NATD_DRAFT:
            case ISAKMP_NPTYPE_NATD_RFC:
                  if (pa->type == iph1->natt_options->payload_nat_d)
                  {
                        vchar_t *natd_received = NULL;
                        int natd_verified;
                        
                        if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
                              goto end;
                        
                        if (natd_seq == 0)
                              iph1->natt_flags |= NAT_DETECTED;
                        
                        natd_verified = natt_compare_addr_hash (iph1,
                              natd_received, natd_seq++);
                        
                        plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
                              natd_seq - 1,
                              natd_verified ? "verified" : "doesn't match");
                        
                        vfree (natd_received);
                        break;
                  }
                  /* passthrough to default... */
#endif

            default:
                  /* don't send information, see ident_r1recv() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

#ifdef ENABLE_NATT
      if (NATT_AVAILABLE(iph1))
            plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
                  iph1->natt_flags & NAT_DETECTED ? 
                              "detected:" : "not detected",
                  iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
                  iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
#endif

      /* payload existency check */
      if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "few isakmp message received.\n");
            goto end;
      }

      iph1->status = PHASE1ST_MSG2RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
#ifdef HAVE_GSSAPI
      if (gsstoken)
            vfree(gsstoken);
#endif

      if (error) {
            VPTRINIT(iph1->dhpub_p);
            VPTRINIT(iph1->nonce_p);
            VPTRINIT(iph1->id_p);
      }

      return error;
}

/*
 * send to initiator
 *    psk: HDR, KE, Nr
 *    sig: HDR, KE, Nr [, CR ]
 *   gssapi: HDR, KE, Nr, GSSr
 *    rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
 *    rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
 */
int
ident_r2send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;

      /* validity check */
      if (iph1->status != PHASE1ST_MSG2RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* generate DH public value */
      if (oakley_dh_generate(iph1->approval->dhgrp,
                        &iph1->dhpub, &iph1->dhpriv) < 0)
            goto end;

      /* generate NONCE value */
      iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
      if (iph1->nonce == NULL)
            goto end;

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
            gssapi_get_rtoken(iph1, NULL);
#endif

      /* create HDR;KE;NONCE payload */
      iph1->sendbuf = ident_ir2mx(iph1);
      if (iph1->sendbuf == NULL)
            goto end;

#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
#endif

      /* send the packet, add to the schedule to resend */
      iph1->retry_counter = iph1->rmconf->retry_counter;
      if (isakmp_ph1resend(iph1) == -1)
            goto end;

      /* the sending message is added to the received-list. */
      if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
            plog(LLV_ERROR , LOCATION, NULL,
                  "failed to add a response packet to the tree.\n");
            goto end;
      }

      /* compute sharing secret of DH */
      if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
                        iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
            goto end;

      /* generate SKEYIDs & IV & final cipher key */
      if (oakley_skeyid(iph1) < 0)
            goto end;
      if (oakley_skeyid_dae(iph1) < 0)
            goto end;
      if (oakley_compute_enckey(iph1) < 0)
            goto end;
      if (oakley_newiv(iph1) < 0)
            goto end;

      iph1->status = PHASE1ST_MSG2SENT;

      error = 0;

end:
      return error;
}

/*
 * receive from initiator
 *    psk: HDR*, IDi1, HASH_I
 *    sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
 *   gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
 *    rsa: HDR*, HASH_I
 *    rev: HDR*, HASH_I
 */
int
ident_r3recv(iph1, msg0)
      struct ph1handle *iph1;
      vchar_t *msg0;
{
      vchar_t *msg = NULL;
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
      int type;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG2SENT) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* decrypting */
      if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "reject the packet, "
                  "expecting the packet encrypted.\n");
            goto end;
      }
      msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
      if (msg == NULL)
            goto end;

      /* validate the type of next payload */
      pbuf = isakmp_parse(msg);
      if (pbuf == NULL)
            goto end;

      iph1->pl_hash = NULL;

      for (pa = (struct isakmp_parse_t *)pbuf->v;
           pa->type != ISAKMP_NPTYPE_NONE;
           pa++) {

            switch (pa->type) {
            case ISAKMP_NPTYPE_ID:
                  if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_HASH:
                  iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
                  break;
            case ISAKMP_NPTYPE_CR:
                  if (oakley_savecr(iph1, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_CERT:
                  if (oakley_savecert(iph1, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_SIG:
                  if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
                        goto end;
                  break;
#ifdef HAVE_GSSAPI
            case ISAKMP_NPTYPE_GSS:
                  if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
                        goto end;
                  gssapi_save_received_token(iph1, gsstoken);
                  break;
#endif
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;
            case ISAKMP_NPTYPE_N:
                  isakmp_check_notify(pa->ptr, iph1);
                  break;
            default:
                  /* don't send information, see ident_r1recv() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

      /* payload existency check */
      /* XXX same as ident_i4recv(), should be merged. */
    {
      int ng = 0;

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            if (iph1->id_p == NULL || iph1->pl_hash == NULL)
                  ng++;
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
            if (iph1->id_p == NULL || iph1->sig_p == NULL)
                  ng++;
            break;
      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            if (iph1->pl_hash == NULL)
                  ng++;
            break;
#ifdef HAVE_GSSAPI
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            if (gsstoken == NULL && iph1->pl_hash == NULL)
                  ng++;
            break;
#endif
      default:
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "invalid authmethod %d why ?\n",
                  iph1->approval->authmethod);
            goto end;
      }
      if (ng) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "few isakmp message received.\n");
            goto end;
      }
    }

      /* verify identifier */
      if (ipsecdoi_checkid1(iph1) != 0) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "invalid ID payload.\n");
            goto end;
      }

      /* validate authentication value */
#ifdef HAVE_GSSAPI
      if (gsstoken == NULL) {
#endif
            type = oakley_validate_auth(iph1);
            if (type != 0) {
                  if (type == -1) {
                        /* msg printed inner oakley_validate_auth() */
                        goto end;
                  }
                  EVT_PUSH(iph1->local, iph1->remote, 
                      EVTT_PEERPH1AUTH_FAILED, NULL);
                  isakmp_info_send_n1(iph1, type, NULL);
                  goto end;
            }
#ifdef HAVE_GSSAPI
      }
#endif

      if (oakley_checkcr(iph1) < 0) {
            /* Ignore this error in order to be interoperability. */
            ;
      }

      /*
       * XXX: Should we do compare two addresses, ph1handle's and ID
       * payload's.
       */

      plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID\n");
      plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);

      /* see handler.h about IV synchronization. */
      memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);

#ifdef HAVE_GSSAPI
      iph1->status = gsstoken != NULL ? PHASE1ST_MSG2RECEIVED :
          PHASE1ST_MSG3RECEIVED;
#else
      iph1->status = PHASE1ST_MSG3RECEIVED;
#endif

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (msg)
            vfree(msg);
#ifdef HAVE_GSSAPI
      if (gsstoken)
            vfree(gsstoken);
#endif

      if (error) {
            VPTRINIT(iph1->id_p);
            oakley_delcert(iph1->cert_p);
            iph1->cert_p = NULL;
            oakley_delcert(iph1->crl_p);
            iph1->crl_p = NULL;
            VPTRINIT(iph1->sig_p);
            oakley_delcert(iph1->cr_p);
            iph1->cr_p = NULL;
      }

      return error;
}

/*
 * send to initiator
 *    psk: HDR*, IDr1, HASH_R
 *    sig: HDR*, IDr1, [ CERT, ] SIG_R
 *   gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
 *    rsa: HDR*, HASH_R
 *    rev: HDR*, HASH_R
 */
int
ident_r3send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;
      int dohash = 1;
#ifdef HAVE_GSSAPI
      int len;
#endif

      /* validity check */
      if (iph1->status != PHASE1ST_MSG3RECEIVED) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "status mismatched %d.\n", iph1->status);
            goto end;
      }

      /* make ID payload into isakmp status */
      if (ipsecdoi_setid1(iph1) < 0)
            goto end;

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
          gssapi_more_tokens(iph1)) {
            gssapi_get_rtoken(iph1, &len);
            if (len != 0)
                  dohash = 0;
      }
#endif

      if (dohash) {
            /* generate HASH to send */
            plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_R\n");
            iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
            if (iph1->hash == NULL)
                  goto end;
      } else
            iph1->hash = NULL;

      /* set encryption flag */
      iph1->flags |= ISAKMP_FLAG_E;

      /* create HDR;ID;HASH payload */
      iph1->sendbuf = ident_ir3mx(iph1);
      if (iph1->sendbuf == NULL)
            goto end;

      /* send HDR;ID;HASH to responder */
      if (isakmp_send(iph1, iph1->sendbuf) < 0)
            goto end;

      /* the sending message is added to the received-list. */
      if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
            plog(LLV_ERROR , LOCATION, NULL,
                  "failed to add a response packet to the tree.\n");
            goto end;
      }

      /* see handler.h about IV synchronization. */
      memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

end:

      return error;
}

/*
 * This is used in main mode for:
 * initiator's 3rd exchange send to responder
 *    psk: HDR, KE, Ni
 *    sig: HDR, KE, Ni
 *    rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
 *    rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
 *              <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
 * responders 2nd exchnage send to initiator
 *    psk: HDR, KE, Nr
 *    sig: HDR, KE, Nr [, CR ]
 *    rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
 *    rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
 */
static vchar_t *
ident_ir2mx(iph1)
      struct ph1handle *iph1;
{
      vchar_t *buf = 0;
      struct payload_list *plist = NULL;
      int need_cr = 0;
      vchar_t *cr = NULL;
      vchar_t *vid = NULL;
      int error = -1;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif
#ifdef ENABLE_NATT
      vchar_t *natd[2] = { NULL, NULL };
#endif

      /* create CR if need */
      if (iph1->side == RESPONDER
       && iph1->rmconf->send_cr
       && oakley_needcr(iph1->approval->authmethod)
       && iph1->rmconf->peerscertfile == NULL) {
            need_cr = 1;
            cr = oakley_getcr(iph1);
            if (cr == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "failed to get cr buffer.\n");
                  goto end;
            }
      }

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
            gssapi_get_token_to_send(iph1, &gsstoken);
#endif

      /* create isakmp KE payload */
      plist = isakmp_plist_append(plist, iph1->dhpub, ISAKMP_NPTYPE_KE);

      /* create isakmp NONCE payload */
      plist = isakmp_plist_append(plist, iph1->nonce, ISAKMP_NPTYPE_NONCE);

#ifdef HAVE_GSSAPI
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
            plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
#endif

      /* append vendor id, if needed */
      if (vid)
            plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);

      /* create isakmp CR payload if needed */
      if (need_cr)
            plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);

#ifdef ENABLE_NATT
      /* generate and append NAT-D payloads */
      if (NATT_AVAILABLE(iph1) && iph1->status == PHASE1ST_MSG2RECEIVED)
      {
            if ((natd[0] = natt_hash_addr (iph1, iph1->remote)) == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "NAT-D hashing failed for %s\n", saddr2str(iph1->remote));
                  goto end;
            }

            if ((natd[1] = natt_hash_addr (iph1, iph1->local)) == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "NAT-D hashing failed for %s\n", saddr2str(iph1->local));
                  goto end;
            }

            plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
            plist = isakmp_plist_append(plist, natd[0], iph1->natt_options->payload_nat_d);
            plist = isakmp_plist_append(plist, natd[1], iph1->natt_options->payload_nat_d);
      }
#endif
      
      buf = isakmp_plist_set_all (&plist, iph1);
      
      error = 0;

end:
      if (error && buf != NULL) {
            vfree(buf);
            buf = NULL;
      }
      if (cr)
            vfree(cr);
#ifdef HAVE_GSSAPI
      if (gsstoken)
            vfree(gsstoken);
#endif
      if (vid)
            vfree(vid);

#ifdef ENABLE_NATT
      if (natd[0])
            vfree(natd[0]);
      if (natd[1])
            vfree(natd[1]);
#endif

      return buf;
}

/*
 * This is used in main mode for:
 * initiator's 4th exchange send to responder
 *    psk: HDR*, IDi1, HASH_I
 *    sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
 *   gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
 *    rsa: HDR*, HASH_I
 *    rev: HDR*, HASH_I
 * responders 3rd exchnage send to initiator
 *    psk: HDR*, IDr1, HASH_R
 *    sig: HDR*, IDr1, [ CERT, ] SIG_R
 *   gssapi: HDR*, [ IDr1, ] < GSSr(n) | HASH_R >
 *    rsa: HDR*, HASH_R
 *    rev: HDR*, HASH_R
 */
static vchar_t *
ident_ir3mx(iph1)
      struct ph1handle *iph1;
{
      struct payload_list *plist = NULL;
      vchar_t *buf = NULL, *new = NULL;
      int need_cr = 0;
      int need_cert = 0;
      vchar_t *cr = NULL;
      int error = -1;
#ifdef HAVE_GSSAPI
      int nptype;
      vchar_t *gsstoken = NULL;
      vchar_t *gsshash = NULL;
#endif

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            /* create isakmp ID payload */
            plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);

            /* create isakmp HASH payload */
            plist = isakmp_plist_append(plist, iph1->hash, ISAKMP_NPTYPE_HASH);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
            if (oakley_getmycert(iph1) < 0)
                  goto end;

            if (oakley_getsign(iph1) < 0)
                  goto end;

            /* create CR if need */
            if (iph1->side == INITIATOR
             && iph1->rmconf->send_cr
             && oakley_needcr(iph1->approval->authmethod)
             && iph1->rmconf->peerscertfile == NULL) {
                  need_cr = 1;
                  cr = oakley_getcr(iph1);
                  if (cr == NULL) {
                        plog(LLV_ERROR, LOCATION, NULL,
                              "failed to get cr buffer.\n");
                        goto end;
                  }
            }

            if (iph1->cert != NULL && iph1->rmconf->send_cert)
                  need_cert = 1;

            /* add ID payload */
            plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);

            /* add CERT payload if there */
            if (need_cert)
                  plist = isakmp_plist_append(plist, iph1->cert->pl, ISAKMP_NPTYPE_CERT);
            /* add SIG payload */
            plist = isakmp_plist_append(plist, iph1->sig, ISAKMP_NPTYPE_SIG);

            /* create isakmp CR payload */
            if (need_cr)
                  plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);
            break;
#ifdef HAVE_GSSAPI
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            if (iph1->hash != NULL) {
                  gsshash = gssapi_wraphash(iph1);
                  if (gsshash == NULL)
                        goto end;
            } else {
                  gssapi_get_token_to_send(iph1, &gsstoken);
            }

            if (!gssapi_id_sent(iph1)) {
                  /* create isakmp ID payload */
                  plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
                  gssapi_set_id_sent(iph1);
            }

            if (iph1->hash != NULL)
                  /* create isakmp HASH payload */
                  plist = isakmp_plist_append(plist, gsshash, ISAKMP_NPTYPE_HASH);
            else
                  plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
            break;
#endif
      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            plog(LLV_ERROR, LOCATION, NULL,
                  "not supported authentication type %d\n",
                  iph1->approval->authmethod);
            goto end;
      default:
            plog(LLV_ERROR, LOCATION, NULL,
                  "invalid authentication type %d\n",
                  iph1->approval->authmethod);
            goto end;
      }

      buf = isakmp_plist_set_all (&plist, iph1);
      
#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(buf, iph1->local, iph1->remote, 1);
#endif

      /* encoding */
      new = oakley_do_encrypt(iph1, buf, iph1->ivm->ive, iph1->ivm->iv);
      if (new == NULL)
            goto end;

      vfree(buf);

      buf = new;

      error = 0;

end:
      if (cr)
            vfree(cr);
      if (error && buf != NULL) {
            vfree(buf);
            buf = NULL;
      }

      return buf;
}

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