/*      $NetBSD: isakmp_agg.c,v 1.18 2025/03/07 15:55:29 christos Exp $ */

/* Id: isakmp_agg.c,v 1.28 2006/04/06 16:46:08 manubsd 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"

#ifdef ENABLE_HYBRID
#include <resolv.h>
#endif

#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(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] = { NULL };
        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
        vchar_t *gsstoken = NULL;
        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, 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_XAUTH_PSKEY_I:
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
                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

        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) {
                if (gssapi_get_token_to_send(iph1, &gsstoken) < 0) {
                        plog(LLV_ERROR, LOCATION, NULL,
                             "Failed to get gssapi token.\n");
                        goto end;
                }
                plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
        }
#endif
        /* create isakmp CR payload */
        if (oakley_needcr(iph1->rmconf->proposal->authmethod))
                plist = oakley_append_cr(plist, iph1);

#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);
#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 */
        if (isakmp_ph1send(iph1) == -1)
                goto end;

        iph1->status = PHASE1ST_MSG1SENT;

        error = 0;

end:
#ifdef HAVE_GSSAPI
        if (gsstoken)
                vfree(gsstoken);
#endif
#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_HYBRID
        if (vid_xauth != NULL)
                vfree(vid_xauth);
        if (vid_unity != NULL)
                vfree(vid_unity);
#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(struct ph1handle *iph1, vchar_t *msg)
{
        vchar_t *pbuf = NULL;
        struct isakmp_parse_t *pa;
        vchar_t *satmp = NULL;
        int error = -1;
        int ptype;
#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:
                        handle_vendorid(iph1, pa->ptr);
                        break;
                case ISAKMP_NPTYPE_N:
                        isakmp_log_notify(iph1,
                                (struct isakmp_pl_n *) pa->ptr,
                                "aggressive exchange");
                        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 != NULL &&
                            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
                        /*FALLTHROUGH*/
                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 */
        if (iph1->dhpub_p == NULL || iph1->nonce_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;
        }

        /* 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_phase1(iph1, EVT_PHASE1_AUTH_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:
#ifdef HAVE_GSSAPI
        if (gsstoken)
                vfree(gsstoken);
#endif
        if (pbuf)
                vfree(pbuf);
        if (satmp)
                vfree(satmp);
        if (error) {
                VPTRINIT(iph1->dhpub_p);
                VPTRINIT(iph1->nonce_p);
                VPTRINIT(iph1->id_p);
                VPTRINIT(iph1->cert_p);
                VPTRINIT(iph1->crl_p);
                VPTRINIT(iph1->sig_p);
                VPTRINIT(iph1->cr_p);
        }

        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(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) &&
#ifdef ENABLE_HYBRID
                    !iph1->rmconf->xauth &&
#endif
                    1)
                        isakmp_info_send_n1(iph1,
                            ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
#endif
                goto end;
        }

        switch (iph1->approval->authmethod) {
        case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
#ifdef ENABLE_HYBRID
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_I:
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
#endif
                /* 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_XAUTH_RSASIG_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_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,
                                                    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:
#ifdef ENABLE_HYBRID
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
#endif
                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(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 = handle_vendorid(iph1, pa->ptr);
#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 */
        if (iph1->dhpub_p == NULL || iph1->nonce_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;
        }

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

        iph1->status = PHASE1ST_MSG1RECEIVED;

        error = 0;

end:
#ifdef HAVE_GSSAPI
        if (gsstoken)
                vfree(gsstoken);
#endif
        if (pbuf)
                vfree(pbuf);
        if (error) {
                VPTRINIT(iph1->sa);
                VPTRINIT(iph1->dhpub_p);
                VPTRINIT(iph1->nonce_p);
                VPTRINIT(iph1->id_p);
                VPTRINIT(iph1->cr_p);
        }

        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(struct ph1handle *iph1, vchar_t *msg)
{
        struct payload_list *plist = NULL;
        int need_cert = 0;
        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 ENABLE_FRAG
        vchar_t *vid_frag = NULL;
#endif

#ifdef HAVE_GSSAPI
        int gsslen;
        vchar_t *gsstoken = NULL, *gsshash = NULL;
        vchar_t *gss_sa = NULL;
        int free_gss_sa = 0;
#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;
        }

#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
#ifdef ENABLE_FRAG
        if (iph1->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

        switch (iph1->approval->authmethod) {
        case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
#ifdef ENABLE_HYBRID
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
#endif
                /* 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);

                /* create isakmp CR payload if needed */
                if (oakley_needcr(iph1->approval->authmethod))
                        plist = oakley_append_cr(plist, iph1);
                break;
        case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
        case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
#ifdef ENABLE_HYBRID
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
        case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
#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,
                                                    ISAKMP_NPTYPE_CERT);

                /* add SIG payload */
                plist = isakmp_plist_append(plist,
                    iph1->sig, ISAKMP_NPTYPE_SIG);

                /* create isakmp CR payload if needed */
                if (oakley_needcr(iph1->approval->authmethod))
                        plist = oakley_append_cr(plist, iph1);
                break;

        case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
        case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
#ifdef ENABLE_HYBRID
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
        case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
#endif
                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->rmconf,
                                                                 iph1->approval);
                        else
                                gss_sa = iph1->sa_ret;

                        if (gss_sa != iph1->sa_ret)
                                free_gss_sa = 1;

                        /* 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 */
                        if (gssapi_get_token_to_send(iph1, &gsstoken) < 0) {
                                plog(LLV_ERROR, LOCATION, NULL,
                                    "Failed to get gssapi token.\n");
                                goto end;
                        }
                        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 */
                        break;
#endif
        }

#ifdef ENABLE_HYBRID
        if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) {
                plog (LLV_INFO, LOCATION, NULL, "Adding xauth VID payload.\n");
                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

#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_FRAG
        if (vid_frag)
                plist = isakmp_plist_append(plist, vid_frag, ISAKMP_NPTYPE_VID);
#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 */
        if (isakmp_ph1send(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_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 (free_gss_sa)
                vfree(gss_sa);
#endif
#ifdef ENABLE_DPD
        if (vid_dpd)
                vfree(vid_dpd);
#endif
#ifdef ENABLE_FRAG
        if (vid_frag)
                vfree(vid_frag);
#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(struct ph1handle *iph1, vchar_t *msg0)
{
        vchar_t *msg = NULL;
        vchar_t *pbuf = NULL;
        struct isakmp_parse_t *pa;
        int error = -1, 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:
                        handle_vendorid(iph1, 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_log_notify(iph1,
                                (struct isakmp_pl_n *) pa->ptr,
                                "aggressive exchange");
                        break;

#ifdef ENABLE_NATT
                case ISAKMP_NPTYPE_NATD_DRAFT:
                case ISAKMP_NPTYPE_NATD_RFC:
                        if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
                                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
                        /*FALLTHROUGH*/
                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_phase1(iph1, EVT_PHASE1_AUTH_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) {
                VPTRINIT(iph1->cert_p);
                VPTRINIT(iph1->crl_p);
                VPTRINIT(iph1->sig_p);
        }

        return error;
}

/*
 * status update and establish isakmp sa.
 */
int
agg_r2send(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;
}