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isakmp_agg.c

/* $Id: isakmp_agg.c,v 1.19.2.3 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.
 */

/* Aggressive Exchange (Aggressive 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_agg.h"
#include "isakmp_inf.h"
#ifdef ENABLE_HYBRID
#include "isakmp_xauth.h"
#include "isakmp_cfg.h"
#endif
#ifdef ENABLE_FRAG
#include "isakmp_frag.h"
#endif
#include "vendorid.h"
#include "strnames.h"

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

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

/*
 * begin Aggressive Mode as initiator.
 */
/*
 * send to responder
 *    psk: HDR, SA, KE, Ni, IDi1
 *    sig: HDR, SA, KE, Ni, IDi1 [, CR ]
 *   gssapi: HDR, SA, KE, Ni, IDi1, GSSi
 *    rsa: HDR, SA, [ HASH(1),] KE, <IDi1_b>Pubkey_r, <Ni_b>Pubkey_r
 *    rev: HDR, SA, [ HASH(1),] <Ni_b>Pubkey_r, <KE_b>Ke_i,
 *         <IDii_b>Ke_i [, <Cert-I_b>Ke_i ]
 */
int
agg_i1send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg; /* must be null */
{
      struct payload_list *plist = NULL;
      int need_cr = 0;
      vchar_t *cr = NULL, *gsstoken = NULL;
      int error = -1;
#ifdef ENABLE_NATT
      vchar_t *vid_natt[MAX_NATT_VID_COUNT];
      int i;
#endif
#ifdef ENABLE_HYBRID
      vchar_t *vid_xauth = NULL;
      vchar_t *vid_unity = NULL;
#endif
#ifdef ENABLE_FRAG
      vchar_t *vid_frag = NULL;
#endif
#ifdef HAVE_GSSAPI
      int len;
#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);

      /* 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;

      /* consistency check of proposals */
      if (iph1->rmconf->dhgrp == NULL) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "configuration failure about DH group.\n");
            goto end;
      }

      /* generate DH public value */
      if (oakley_dh_generate(iph1->rmconf->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 ENABLE_HYBRID
      /* Do we need Xauth VID? */
      switch (iph1->rmconf->proposal->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
            if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL)
                  plog(LLV_ERROR, LOCATION, NULL, 
                       "Xauth vendor ID generation failed\n");
            if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL)
                  plog(LLV_ERROR, LOCATION, NULL, 
                       "Unity vendor ID generation failed\n");
            break;
      default:
            break;
      }
#endif

#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_AGG);
            if (vid_frag == NULL)
                  plog(LLV_ERROR, LOCATION, NULL,
                      "Frag vendorID construction failed\n");
      }           
#endif

      /* create CR if need */
      if (iph1->rmconf->send_cr
       && oakley_needcr(iph1->rmconf->proposal->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;
            }
      }

      plog(LLV_DEBUG, LOCATION, NULL, "authmethod is %s\n",
            s_oakley_attr_method(iph1->rmconf->proposal->authmethod));
#ifdef HAVE_GSSAPI
      if (iph1->rmconf->proposal->authmethod ==
          OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) {
            gssapi_get_itoken(iph1, &len);
      }
#endif

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

      /* 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);

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

#ifdef HAVE_GSSAPI
      if (iph1->rmconf->proposal->authmethod ==
          OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) {
            gssapi_get_token_to_send(iph1, &gsstoken);
            plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
      } else
#endif
      /* create isakmp CR payload */
      if (need_cr)
            plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);

#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 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_HYBRID
      if (vid_xauth)
            plist = isakmp_plist_append(plist, 
                vid_xauth, ISAKMP_NPTYPE_VID);
      if (vid_unity)
            plist = isakmp_plist_append(plist, 
                vid_unity, ISAKMP_NPTYPE_VID);
#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:
      if (cr)
            vfree(cr);
      if (gsstoken)
            vfree(gsstoken);
#ifdef ENABLE_FRAG
      if (vid_frag)
            vfree(vid_frag);
#endif
#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, KE, Nr, IDr1, HASH_R
 *    sig: HDR, SA, KE, Nr, IDr1, [ CR, ] [ CERT, ] SIG_R
 *   gssapi: HDR, SA, KE, Nr, IDr1, GSSr, HASH_R
 *    rsa: HDR, SA, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i, HASH_R
 *    rev: HDR, SA, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDir_b>Ke_r, HASH_R
 */
int
agg_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;
      int ptype;
#ifdef ENABLE_HYBRID
      vchar_t *unity_vid;
      vchar_t *xauth_vid;
#endif
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif

#ifdef ENABLE_NATT
      int natd_seq = 0;
      struct natd_payload {
            int seq;
            vchar_t *payload;
            TAILQ_ENTRY(natd_payload) chain;
      };
      TAILQ_HEAD(_natd_payload, natd_payload) natd_tree;
      TAILQ_INIT(&natd_tree);
#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;
      pa = (struct isakmp_parse_t *)pbuf->v;

      iph1->pl_hash = NULL;

      /* 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_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_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;
            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_HYBRID
                  switch (vid_numeric) {
                  case VENDORID_XAUTH:
                        iph1->mode_cfg->flags |= 
                            ISAKMP_CFG_VENDORID_XAUTH;
                        break;

                  case VENDORID_UNITY:
                        iph1->mode_cfg->flags |= 
                            ISAKMP_CFG_VENDORID_UNITY;
                        break;
                  default:
                        break;
                  }
#endif
#ifdef ENABLE_DPD
                  if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd) {
                        iph1->dpd_support=1;
                        plog(LLV_DEBUG, LOCATION, NULL,
                               "remote supports DPD\n");
                  }
#endif
                  break;
            case ISAKMP_NPTYPE_N:
                  isakmp_check_notify(pa->ptr, iph1);
                  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) {
                        struct natd_payload *natd;
                        natd = (struct natd_payload *)racoon_malloc(sizeof(*natd));
                        if (!natd)
                              goto end;

                        natd->payload = NULL;

                        if (isakmp_p2ph (&natd->payload, pa->ptr) < 0)
                              goto end;

                        natd->seq = natd_seq++;

                        TAILQ_INSERT_TAIL(&natd_tree, natd, chain);
                        break;
                  }
                  /* passthrough to default... */
#endif

            default:
                  /* don't send information, see isakmp_ident_r1() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

      /* payload existency check */
      /* XXX to be checked each authentication method. */

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

      /* 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);

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

#ifdef ENABLE_NATT
      if (NATT_AVAILABLE(iph1)) {
            struct natd_payload *natd = NULL;
            int natd_verified;
            
            plog(LLV_INFO, LOCATION, iph1->remote,
                 "Selected NAT-T version: %s\n",
                 vid_string_by_id(iph1->natt_options->version));

            /* set both bits first so that we can clear them
               upon verifying hashes */
            iph1->natt_flags |= NAT_DETECTED;
                        
            while ((natd = TAILQ_FIRST(&natd_tree)) != NULL) {
                  /* this function will clear appropriate bits bits 
                     from iph1->natt_flags */
                  natd_verified = natt_compare_addr_hash (iph1,
                        natd->payload, natd->seq);

                  plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
                        natd->seq - 1,
                        natd_verified ? "verified" : "doesn't match");
                  
                  vfree (natd->payload);

                  TAILQ_REMOVE(&natd_tree, natd, chain);
                  racoon_free (natd);
            }

            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

      /* compute sharing secret of DH */
      if (oakley_dh_compute(iph1->rmconf->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;

      /* 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;
      }

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

      /* change status of isakmp status entry */
      iph1->status = PHASE1ST_MSG2RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (satmp)
            vfree(satmp);
      if (error) {
            VPTRINIT(iph1->dhpub_p);
            VPTRINIT(iph1->nonce_p);
            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 responder
 *    psk: HDR, HASH_I
 *   gssapi: HDR, HASH_I
 *    sig: HDR, [ CERT, ] SIG_I
 *    rsa: HDR, HASH_I
 *    rev: HDR, HASH_I
 */
int
agg_i2send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      int need_cert = 0;
      int error = -1;
      vchar_t *gsshash = NULL;

      /* 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");
      iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
      if (iph1->hash == NULL) {
#ifdef HAVE_GSSAPI
            if (gssapi_more_tokens(iph1))
                  isakmp_info_send_n1(iph1,
                      ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
#endif
            goto end;
      }

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            /* set 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:
#ifdef ENABLE_HYBRID
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
#endif  
            /* XXX if there is CR or not ? */

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

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

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

            /* 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_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            break;
#ifdef HAVE_GSSAPI
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            gsshash = gssapi_wraphash(iph1);
            if (gsshash == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "failed to wrap hash\n");
                  isakmp_info_send_n1(iph1,
                        ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
                  goto end;
            }

            plist = isakmp_plist_append(plist, gsshash, ISAKMP_NPTYPE_HASH);
            break;
#endif
      }

#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 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;
      }

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

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

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

/*
 * receive from initiator
 *    psk: HDR, SA, KE, Ni, IDi1
 *    sig: HDR, SA, KE, Ni, IDi1 [, CR ]
 *   gssapi: HDR, SA, KE, Ni, IDi1 , GSSi
 *    rsa: HDR, SA, [ HASH(1),] KE, <IDi1_b>Pubkey_r, <Ni_b>Pubkey_r
 *    rev: HDR, SA, [ HASH(1),] <Ni_b>Pubkey_r, <KE_b>Ke_i,
 *         <IDii_b>Ke_i [, <Cert-I_b>Ke_i ]
 */
int
agg_r1recv(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      int error = -1;
      vchar_t *pbuf = NULL;
      struct isakmp_parse_t *pa;
      int vid_numeric;
#ifdef HAVE_GSSAPI
      vchar_t *gsstoken = NULL;
#endif

      /* 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 */
      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(&iph1->sa, pa->ptr) < 0)
            goto end;
      pa++;

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

            plog(LLV_DEBUG, LOCATION, NULL,
                  "received payload of type %s\n",
                  s_isakmp_nptype(pa->type));

            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_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);
                        break;
                  }
#endif
#ifdef ENABLE_HYBRID
                  switch (vid_numeric) {
                  case VENDORID_XAUTH:
                        iph1->mode_cfg->flags |= 
                            ISAKMP_CFG_VENDORID_XAUTH;
                        break;

                  case VENDORID_UNITY:
                        iph1->mode_cfg->flags |= 
                            ISAKMP_CFG_VENDORID_UNITY;
                        break;
                  default:
                        break;
                  }
#endif
#ifdef ENABLE_DPD
                  if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd) {
                        iph1->dpd_support=1;
                        plog(LLV_DEBUG, LOCATION, NULL,
                               "remote supports DPD\n");
                  }
#endif
#ifdef ENABLE_FRAG
                  if ((vid_numeric == VENDORID_FRAG) &&
                      (vendorid_frag_cap(pa->ptr) & VENDORID_FRAG_AGG))
                        iph1->frag = 1;
#endif
                  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
            default:
                  /* don't send information, see isakmp_ident_r1() */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore the packet, "
                        "received unexpecting payload type %d.\n",
                        pa->type);
                  goto end;
            }
      }

      /* payload existency check */
      /* XXX to be checked each authentication method. */

      /* 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;
      }

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

      iph1->status = PHASE1ST_MSG1RECEIVED;

      error = 0;

end:
      if (pbuf)
            vfree(pbuf);
      if (error) {
            VPTRINIT(iph1->sa);
            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 initiator
 *    psk: HDR, SA, KE, Nr, IDr1, HASH_R
 *    sig: HDR, SA, KE, Nr, IDr1, [ CR, ] [ CERT, ] SIG_R
 *   gssapi: HDR, SA, KE, Nr, IDr1, GSSr, HASH_R
 *    rsa: HDR, SA, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i, HASH_R
 *    rev: HDR, SA, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDir_b>Ke_r, HASH_R
 */
int
agg_r1send(iph1, msg)
      struct ph1handle *iph1;
      vchar_t *msg;
{
      struct payload_list *plist = NULL;
      int need_cr = 0;
      int need_cert = 0;
      vchar_t *cr = NULL;
      vchar_t *vid = NULL;
      int error = -1;
#ifdef ENABLE_HYBRID
      vchar_t *xauth_vid = NULL;
      vchar_t *unity_vid = NULL;
#endif
#ifdef ENABLE_NATT
      vchar_t *vid_natt = NULL;
      vchar_t *natd[2] = { NULL, NULL };
#endif
#ifdef ENABLE_DPD
      vchar_t *vid_dpd = NULL;
#endif

#ifdef HAVE_GSSAPI
      int gsslen;
      vchar_t *gsstoken = NULL, *gsshash = NULL;
      vchar_t *gss_sa = 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 DH public value */
      if (oakley_dh_generate(iph1->rmconf->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;

      /* 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;

#ifdef HAVE_GSSAPI
      if (iph1->rmconf->proposal->authmethod == 
          OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
            gssapi_get_rtoken(iph1, &gsslen);
#endif

      /* generate HASH to send */
      plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_R\n");
      iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
      if (iph1->hash == NULL) {
#ifdef HAVE_GSSAPI
            if (gssapi_more_tokens(iph1))
                  isakmp_info_send_n1(iph1,
                      ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
#endif
            goto end;
      }

      /* create CR if need */
      if (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 ENABLE_NATT
      /* Has the peer announced NAT-T? */
      if (NATT_AVAILABLE(iph1)) {
            /* set chosen VID */
            vid_natt = set_vendorid(iph1->natt_options->version);

            /* generate NAT-D payloads */
            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;
            }
      }
#endif
#ifdef ENABLE_DPD
      /* Only send DPD support if remote announced DPD and if DPD support is active */
      if (iph1->dpd_support && iph1->rmconf->dpd)
            vid_dpd = set_vendorid(VENDORID_DPD);
#endif

      switch (iph1->approval->authmethod) {
      case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
            /* set SA payload to reply */
            plist = isakmp_plist_append(plist, iph1->sa_ret, ISAKMP_NPTYPE_SA);

            /* 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);

            /* 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);

            /* 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);
            break;
      case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
      case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
#ifdef ENABLE_HYBRID
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
      case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
#endif
            /* XXX if there is CR or not ? */

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

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

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

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

            /* 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);

            /* 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);

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

#ifdef ENABLE_HYBRID
      if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) {
            if ((xauth_vid = set_vendorid(VENDORID_XAUTH)) == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "Cannot create Xauth vendor ID\n");
                  goto end;
            }
            plist = isakmp_plist_append(plist, 
                xauth_vid, ISAKMP_NPTYPE_VID);
      }

      if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_UNITY) {
            if ((unity_vid = set_vendorid(VENDORID_UNITY)) == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "Cannot create Unity vendor ID\n");
                  goto end;
            }
            plist = isakmp_plist_append(plist, 
                unity_vid, ISAKMP_NPTYPE_VID);
      }
#endif

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

      case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
      case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
            break;
#ifdef HAVE_GSSAPI
      case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
            /* create buffer to send isakmp payload */
            gsshash = gssapi_wraphash(iph1);
            if (gsshash == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "failed to wrap hash\n");
                  /*
                   * This is probably due to the GSS roundtrips not
                   * being finished yet. Return this error in
                   * the hope that a fallback to main mode will
                   * be done.
                   */
                  isakmp_info_send_n1(iph1,
                      ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
                  goto end;
            }
            if (iph1->approval->gssid != NULL)
                  gss_sa = ipsecdoi_setph1proposal(iph1->approval);  
            else
                  gss_sa = iph1->sa_ret;

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

            /* 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);

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

            /* create GSS payload */
            gssapi_get_token_to_send(iph1, &gsstoken);
            plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);

            /* create isakmp HASH payload */
            plist = isakmp_plist_append(plist, gsshash, ISAKMP_NPTYPE_HASH);

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

            break;
#endif
      }

#ifdef ENABLE_NATT
      /* append NAT-T payloads */
      if (vid_natt) {
            /* chosen VID */
            plist = isakmp_plist_append(plist, vid_natt, ISAKMP_NPTYPE_VID);
            /* NAT-D */
            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
#ifdef ENABLE_DPD
      if (vid_dpd)
            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, 1);
#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:
      if (cr)
            vfree(cr);
      if (vid)
            vfree(vid);
#ifdef ENABLE_HYBRID
      if (xauth_vid)
            vfree(xauth_vid);
      if (unity_vid)
            vfree(unity_vid);
#endif
#ifdef HAVE_GSSAPI
      if (gsstoken)
            vfree(gsstoken);
      if (gsshash)
            vfree(gsshash);
      if (gss_sa != iph1->sa_ret)
            vfree(gss_sa);
#endif
#ifdef ENABLE_DPD
      if (vid_dpd)
            vfree(vid_dpd);
#endif

      return error;
}

/*
 * receive from initiator
 *    psk: HDR, HASH_I
 *   gssapi: HDR, HASH_I
 *    sig: HDR, [ CERT, ] SIG_I
 *    rsa: HDR, HASH_I
 *    rev: HDR, HASH_I
 */
int
agg_r2recv(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 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;
      }

      /* decrypting if need. */
      /* XXX configurable ? */
      if (ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
            msg = oakley_do_decrypt(iph1, msg0,
                              iph1->ivm->iv, iph1->ivm->ive);
            if (msg == NULL)
                  goto end;
      } else
            msg = vdup(msg0);

      /* 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_HASH:
                  iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
                  break;
            case ISAKMP_NPTYPE_VID:
                  (void)check_vendorid(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_N:
                  isakmp_check_notify(pa->ptr, iph1);
                  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 isakmp_ident_r1() */
                  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

      /* 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 (msg)
            vfree(msg);
      if (error) {
            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
agg_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;
      }

      /* IV synchronized when packet encrypted. */
      /* see handler.h about IV synchronization. */
      if (ISSET(((struct isakmp *)msg->v)->flags, ISAKMP_FLAG_E))
            memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->iv->l);

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

      iph1->status = PHASE1ST_ESTABLISHED;

      error = 0;

end:
      return error;
}

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