/* $NetBSD: isakmp_agg.c,v 1.9 2006/09/30 21:49:37 manu 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(iph1, msg)
struct ph1handle *iph1;
vchar_t *msg; /* must be null */
{
struct payload_list *plist = NULL;
int need_cr = 0;
vchar_t *cr = 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->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 (RMAUTHMETHOD(iph1)) {
case FICTIVE_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
/* 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 (RMAUTHMETHOD(iph1) == 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 (RMAUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) {
gssapi_get_token_to_send(iph1, &gsstoken);
plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
}
#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);
#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);
#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(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:
handle_vendorid(iph1, pa->ptr);
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 != 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
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_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:
#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);
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) &&
#ifdef ENABLE_HYBRID
!iph1->rmconf->xauth &&
#endif
1)
isakmp_info_send_n1(iph1,
ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
#endif
goto end;
}
switch (AUTHMETHOD(iph1)) {
case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
#ifdef ENABLE_HYBRID
case FICTIVE_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->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:
#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(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 = 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);
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;
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 (RMAUTHMETHOD(iph1) == 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
#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 (AUTHMETHOD(iph1)) {
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 (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_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->pl, ISAKMP_NPTYPE_CERT);
/* add SIG payload */
plist = isakmp_plist_append(plist,
iph1->sig, ISAKMP_NPTYPE_SIG);
/* 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:
#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->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 */
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 */
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 */
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);
#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(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:
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_check_notify(pa->ptr, iph1);
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
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;
}