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isakmp_base.c

/*    $KAME: isakmp_base.c,v 1.49 2003/11/13 02:30:20 sakane 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.
 */

/* Base Exchange (Base 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_base.h"
#include "isakmp_inf.h"
#include "vendorid.h"
#ifdef ENABLE_NATT
#include "nattraversal.h"
#endif
#ifdef ENABLE_FRAG
#include "isakmp_frag.h"
#endif

/* %%%
 * begin Identity Protection Mode as initiator.
 */
/*
 * send to responder
 *    psk: HDR, SA, Idii, Ni_b
 *    sig: HDR, SA, Idii, Ni_b
 *    rsa: HDR, SA, [HASH(1),] <IDii_b>Pubkey_r, <Ni_b>Pubkey_r
 *    rev: HDR, SA, [HASH(1),] <Ni_b>Pubkey_r, <IDii_b>Ke_i
 */
int
base_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, vid_natt_i = 0;
#endif
#ifdef ENABLE_FRAG
      vchar_t *vid_frag = 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);

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

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

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

#ifdef ENABLE_FRAG
      if (iph1->rmconf->ike_frag) {
            vid_frag = set_vendorid(VENDORID_FRAG);
            if (vid_frag != NULL)
                  vid_frag = isakmp_frag_addcap(vid_frag, 
                      VENDORID_FRAG_BASE);
            if (vid_frag == NULL)
                  plog(LLV_ERROR, LOCATION, NULL, 
                      "Frag vendorID construction failed\n");
      }
#endif
#ifdef ENABLE_NATT
      /* Is NAT-T support allowed in the config file? */
      if (iph1->rmconf->nat_traversal) {
            /* Advertise NAT-T capability */
            memset (vid_natt, 0, sizeof (vid_natt));
#ifdef VENDORID_NATT_00
            if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_00)) != NULL)
                  vid_natt_i++;
#endif
#ifdef VENDORID_NATT_02
            if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_02)) != NULL)
                  vid_natt_i++;
#endif
#ifdef VENDORID_NATT_02_N
            if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_02_N)) != NULL)
                  vid_natt_i++;
#endif
#ifdef VENDORID_NATT_RFC
            if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_RFC)) != NULL)
                  vid_natt_i++;
#endif
      }
#endif

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

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

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

#ifdef ENABLE_FRAG
      if (vid_frag)
            plist = isakmp_plist_append(plist, vid_frag, ISAKMP_NPTYPE_VID);
#endif
#ifdef ENABLE_NATT
      /* set VID payload for NAT-T */
      for (i = 0; i < vid_natt_i; i++)
            plist = isakmp_plist_append(plist, vid_natt[i], ISAKMP_NPTYPE_VID);

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

#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_FRAG
      if (vid_frag)
            vfree(vid_frag);
#endif 
#ifdef ENABLE_NATT
      for (i = 0; i < vid_natt_i; i++)
            vfree(vid_natt[i]);
#endif

      return error;
}

/*
 * receive from responder
 *    psk: HDR, SA, Idir, Nr_b
 *    sig: HDR, SA, Idir, Nr_b, [ CR ]
 *    rsa: HDR, SA, <IDir_b>PubKey_i, <Nr_b>PubKey_i
 *    rev: HDR, SA, <Nr_b>PubKey_i, <IDir_b>Ke_r
 */
int
base_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 */
      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_NONCE:
                  if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_ID:
                  if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
                        goto end;
                  break;
            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
                  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;
            }
      }

      if (iph1->nonce_p == NULL || iph1->id_p == NULL) {
            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;
      }

#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);

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

      return error;
}

/*
 * send to responder
 *    psk: HDR, KE, HASH_I
 *    sig: HDR, KE, [ CR, ] [CERT,] SIG_I
 *    rsa: HDR, KE, HASH_I
 *    rev: HDR, <KE>Ke_i, HASH_I
 */
int
base_i2send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      vchar_t *vid = NULL;
      int need_cert = 0;
      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 SKEYID to compute hash if not signature mode */
      if (iph1->approval->authmethod != OAKLEY_ATTR_AUTH_METHOD_RSASIG
       && iph1->approval->authmethod != OAKLEY_ATTR_AUTH_METHOD_DSSSIG) {
            if (oakley_skeyid(iph1) < 0)
                  goto end;
      }

      /* generate HASH to send */
      plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_I\n");
      iph1->hash = oakley_ph1hash_base_i(iph1, GENERATE);
      if (iph1->hash == NULL)
            goto end;

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            vid = set_vendorid(iph1->approval->vendorid);

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

            /* create isakmp HASH payload */
            plist = isakmp_plist_append(plist, iph1->hash, ISAKMP_NPTYPE_HASH);

            /* append vendor id, if needed */
            if (vid)
                  plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
            /* XXX if there is CR or not ? */

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

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

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

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

            /* 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);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            /* ... */
            break;
      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            break;
      }

#ifdef ENABLE_NATT
      /* generate NAT-D payloads */
      if (NATT_AVAILABLE(iph1))
      {
            vchar_t *natd[2] = { NULL, NULL };

            plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
            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;
            }

            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

      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_MSG2SENT;

      error = 0;

end:
      if (vid)
            vfree(vid);
      return error;
}

/*
 * receive from responder
 *    psk: HDR, KE, HASH_R
 *    sig: HDR, KE, [CERT,] SIG_R
 *    rsa: HDR, KE, HASH_R
 *    rev: HDR, <KE>_Ke_r, HASH_R
 */
int
base_i3recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
      int ptype;
#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_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;
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;

#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 */
      /* validate authentication value */
      ptype = oakley_validate_auth(iph1);
      if (ptype != 0) {
            if (ptype == -1) {
                  /* message printed inner oakley_validate_auth() */
                  goto end;
            }
            EVT_PUSH(iph1->local, iph1->remote, 
                EVTT_PEERPH1AUTH_FAILED, NULL);
            isakmp_info_send_n1(iph1, ptype, NULL);
            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 SKEYID to compute hash if signature mode */
      if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_RSASIG
       || iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_DSSSIG) {
            if (oakley_skeyid(iph1) < 0)
                  goto end;
      }

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

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

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

      iph1->status = PHASE1ST_MSG3RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);

      if (error) {
            VPTRINIT(iph1->dhpub_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
base_i3send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;

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

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

end:
      return error;
}

/*
 * receive from initiator
 *    psk: HDR, SA, Idii, Ni_b
 *    sig: HDR, SA, Idii, Ni_b
 *    rsa: HDR, SA, [HASH(1),] <IDii_b>Pubkey_r, <Ni_b>Pubkey_r
 *    rev: HDR, SA, [HASH(1),] <Ni_b>Pubkey_r, <IDii_b>Ke_i
 */
int
base_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_NONCE:
                  if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
                        goto end;
                  break;
            case ISAKMP_NPTYPE_ID:
                  if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
                        goto end;
                  break;
            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_FRAG
                  if ((vid_numeric == VENDORID_FRAG) &&
                      (vendorid_frag_cap(pa->ptr) & VENDORID_FRAG_BASE))
                        iph1->frag = 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;
            }
      }

      if (iph1->nonce_p == NULL || iph1->id_p == NULL) {
            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;
      }

#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);
            VPTRINIT(iph1->nonce_p);
            VPTRINIT(iph1->id_p);
      }

      return error;
}

/*
 * send to initiator
 *    psk: HDR, SA, Idir, Nr_b
 *    sig: HDR, SA, Idir, Nr_b, [ CR ]
 *    rsa: HDR, SA, <IDir_b>PubKey_i, <Nr_b>PubKey_i
 *    rev: HDR, SA, <Nr_b>PubKey_i, <IDir_b>Ke_r
 */
int
base_r1send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      int error = -1;
#ifdef ENABLE_NATT
      vchar_t *vid_natt = 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);

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

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

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

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

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

#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

      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 ENABLE_NATT
      if (vid_natt)
            vfree(vid_natt);
#endif

      VPTRINIT(iph1->sa_ret);

      return error;
}

/*
 * receive from initiator
 *    psk: HDR, KE, HASH_I
 *    sig: HDR, KE, [ CR, ] [CERT,] SIG_I
 *    rsa: HDR, KE, HASH_I
 *    rev: HDR, <KE>Ke_i, HASH_I
 */
int
base_r2recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int error = -1;
      int ptype;
#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;

      iph1->pl_hash = NULL;

      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_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;
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(pa->ptr);
                  break;

#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;
            }
      }

      /* generate DH public value */
      if (oakley_dh_generate(iph1->approval->dhgrp,
                        &iph1->dhpub, &iph1->dhpriv) < 0)
            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 SKEYID */
      if (oakley_skeyid(iph1) < 0)
            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 */
      /* validate authentication value */
      ptype = oakley_validate_auth(iph1);
      if (ptype != 0) {
            if (ptype == -1) {
                  /* message printed inner oakley_validate_auth() */
                  goto end;
            }
            EVT_PUSH(iph1->local, iph1->remote, 
                EVTT_PEERPH1AUTH_FAILED, NULL);
            isakmp_info_send_n1(iph1, ptype, NULL);
            goto end;
      }

      iph1->status = PHASE1ST_MSG2RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);

      if (error) {
            VPTRINIT(iph1->dhpub_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;
}

/*
 * send to initiator
 *    psk: HDR, KE, HASH_R
 *    sig: HDR, KE, [CERT,] SIG_R
 *    rsa: HDR, KE, HASH_R
 *    rev: HDR, <KE>_Ke_r, HASH_R
 */
int
base_r2send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      vchar_t *vid = NULL;
      int need_cert = 0;
      int error = -1;

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

      /* generate HASH to send */
      plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_I\n");
      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            iph1->hash = oakley_ph1hash_base_r(iph1, GENERATE);
            break;
      default:
            plog(LLV_ERROR, LOCATION, NULL,
                  "invalid authentication method %d\n",
                  iph1->approval->authmethod);
            goto end; 
      }
      if (iph1->hash == NULL)
            goto end;

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            vid = set_vendorid(iph1->approval->vendorid);

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

            /* create isakmp HASH payload */
            plist = isakmp_plist_append(plist, iph1->hash, ISAKMP_NPTYPE_HASH);

            /* append vendor id, if needed */
            if (vid)
                  plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
            /* XXX if there is CR or not ? */

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

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

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

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

            /* 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);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            /* ... */
            break;
      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            break;
      }

#ifdef ENABLE_NATT
      /* generate NAT-D payloads */
      if (NATT_AVAILABLE(iph1))
      {
            vchar_t *natd[2] = { NULL, NULL };

            plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
            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;
            }

            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

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

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

      /* send HDR;KE;NONCE 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;
      }

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

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

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

end:
      if (vid)
            vfree(vid);
      return error;
}

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