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1 /*	$NetBSD: isakmp_agg.c,v 1.9 2006/09/30 21:49:37 manu Exp $	*/
2 
3 /* Id: isakmp_agg.c,v 1.28 2006/04/06 16:46:08 manubsd Exp */
4 
5 /*
6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the project nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 /* Aggressive Exchange (Aggressive Mode) */
35 
36 #include "config.h"
37 
38 #include <sys/types.h>
39 #include <sys/param.h>
40 
41 #include <stdlib.h>
42 #include <stdio.h>
43 #include <string.h>
44 #include <errno.h>
45 #if TIME_WITH_SYS_TIME
46 # include <sys/time.h>
47 # include <time.h>
48 #else
49 # if HAVE_SYS_TIME_H
50 #  include <sys/time.h>
51 # else
52 #  include <time.h>
53 # endif
54 #endif
55 
56 #include "var.h"
57 #include "misc.h"
58 #include "vmbuf.h"
59 #include "plog.h"
60 #include "sockmisc.h"
61 #include "schedule.h"
62 #include "debug.h"
63 
64 #ifdef ENABLE_HYBRID
65 #include <resolv.h>
66 #endif
67 
68 #include "localconf.h"
69 #include "remoteconf.h"
70 #include "isakmp_var.h"
71 #include "isakmp.h"
72 #include "evt.h"
73 #include "oakley.h"
74 #include "handler.h"
75 #include "ipsec_doi.h"
76 #include "crypto_openssl.h"
77 #include "pfkey.h"
78 #include "isakmp_agg.h"
79 #include "isakmp_inf.h"
80 #ifdef ENABLE_HYBRID
81 #include "isakmp_xauth.h"
82 #include "isakmp_cfg.h"
83 #endif
84 #ifdef ENABLE_FRAG
85 #include "isakmp_frag.h"
86 #endif
87 #include "vendorid.h"
88 #include "strnames.h"
89 
90 #ifdef ENABLE_NATT
91 #include "nattraversal.h"
92 #endif
93 
94 #ifdef HAVE_GSSAPI
95 #include "gssapi.h"
96 #endif
97 
98 /*
99  * begin Aggressive Mode as initiator.
100  */
101 /*
102  * send to responder
103  * 	psk: HDR, SA, KE, Ni, IDi1
104  * 	sig: HDR, SA, KE, Ni, IDi1 [, CR ]
105  *   gssapi: HDR, SA, KE, Ni, IDi1, GSSi
106  * 	rsa: HDR, SA, [ HASH(1),] KE, <IDi1_b>Pubkey_r, <Ni_b>Pubkey_r
107  * 	rev: HDR, SA, [ HASH(1),] <Ni_b>Pubkey_r, <KE_b>Ke_i,
108  * 	     <IDii_b>Ke_i [, <Cert-I_b>Ke_i ]
109  */
110 int
agg_i1send(iph1,msg)111 agg_i1send(iph1, msg)
112 	struct ph1handle *iph1;
113 	vchar_t *msg; /* must be null */
114 {
115 	struct payload_list *plist = NULL;
116 	int need_cr = 0;
117 	vchar_t *cr = NULL;
118 	int error = -1;
119 #ifdef ENABLE_NATT
120 	vchar_t *vid_natt[MAX_NATT_VID_COUNT] = { NULL };
121 	int i;
122 #endif
123 #ifdef ENABLE_HYBRID
124 	vchar_t *vid_xauth = NULL;
125 	vchar_t *vid_unity = NULL;
126 #endif
127 #ifdef ENABLE_FRAG
128 	vchar_t *vid_frag = NULL;
129 #endif
130 #ifdef HAVE_GSSAPI
131 	vchar_t *gsstoken = NULL;
132 	int len;
133 #endif
134 #ifdef ENABLE_DPD
135 	vchar_t *vid_dpd = NULL;
136 #endif
137 
138 
139 	/* validity check */
140 	if (msg != NULL) {
141 		plog(LLV_ERROR, LOCATION, NULL,
142 			"msg has to be NULL in this function.\n");
143 		goto end;
144 	}
145 	if (iph1->status != PHASE1ST_START) {
146 		plog(LLV_ERROR, LOCATION, NULL,
147 			"status mismatched %d.\n", iph1->status);
148 		goto end;
149 	}
150 
151 	/* create isakmp index */
152 	memset(&iph1->index, 0, sizeof(iph1->index));
153 	isakmp_newcookie((caddr_t)&iph1->index, iph1->remote, iph1->local);
154 
155 	/* make ID payload into isakmp status */
156 	if (ipsecdoi_setid1(iph1) < 0)
157 		goto end;
158 
159 	/* create SA payload for my proposal */
160 	iph1->sa = ipsecdoi_setph1proposal(iph1->rmconf->proposal);
161 	if (iph1->sa == NULL)
162 		goto end;
163 
164 	/* consistency check of proposals */
165 	if (iph1->rmconf->dhgrp == NULL) {
166 		plog(LLV_ERROR, LOCATION, NULL,
167 			"configuration failure about DH group.\n");
168 		goto end;
169 	}
170 
171 	/* generate DH public value */
172 	if (oakley_dh_generate(iph1->rmconf->dhgrp,
173 				&iph1->dhpub, &iph1->dhpriv) < 0)
174 		goto end;
175 
176 	/* generate NONCE value */
177 	iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
178 	if (iph1->nonce == NULL)
179 		goto end;
180 
181 #ifdef ENABLE_HYBRID
182 	/* Do we need Xauth VID? */
183 	switch (RMAUTHMETHOD(iph1)) {
184 	case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I:
185 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
186 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
187 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
188 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
189 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
190 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
191 		if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL)
192 			plog(LLV_ERROR, LOCATION, NULL,
193 			     "Xauth vendor ID generation failed\n");
194 		if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL)
195 			plog(LLV_ERROR, LOCATION, NULL,
196 			     "Unity vendor ID generation failed\n");
197 		break;
198 	default:
199 		break;
200 	}
201 #endif
202 
203 #ifdef ENABLE_FRAG
204 	if (iph1->rmconf->ike_frag) {
205 		vid_frag = set_vendorid(VENDORID_FRAG);
206 		if (vid_frag != NULL)
207 			vid_frag = isakmp_frag_addcap(vid_frag,
208 			    VENDORID_FRAG_AGG);
209 		if (vid_frag == NULL)
210 			plog(LLV_ERROR, LOCATION, NULL,
211 			    "Frag vendorID construction failed\n");
212 	}
213 #endif
214 
215 	/* create CR if need */
216 	if (iph1->rmconf->send_cr
217 	 && oakley_needcr(iph1->rmconf->proposal->authmethod)
218 	 && iph1->rmconf->peerscertfile == NULL) {
219 		need_cr = 1;
220 		cr = oakley_getcr(iph1);
221 		if (cr == NULL) {
222 			plog(LLV_ERROR, LOCATION, NULL,
223 				"failed to get cr buffer.\n");
224 			goto end;
225 		}
226 	}
227 
228 	plog(LLV_DEBUG, LOCATION, NULL, "authmethod is %s\n",
229 		s_oakley_attr_method(iph1->rmconf->proposal->authmethod));
230 #ifdef HAVE_GSSAPI
231 	if (RMAUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
232 		gssapi_get_itoken(iph1, &len);
233 #endif
234 
235 	/* set SA payload to propose */
236 	plist = isakmp_plist_append(plist, iph1->sa, ISAKMP_NPTYPE_SA);
237 
238 	/* create isakmp KE payload */
239 	plist = isakmp_plist_append(plist, iph1->dhpub, ISAKMP_NPTYPE_KE);
240 
241 	/* create isakmp NONCE payload */
242 	plist = isakmp_plist_append(plist, iph1->nonce, ISAKMP_NPTYPE_NONCE);
243 
244 	/* create isakmp ID payload */
245 	plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
246 
247 #ifdef HAVE_GSSAPI
248 	if (RMAUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) {
249 		gssapi_get_token_to_send(iph1, &gsstoken);
250 		plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
251 	}
252 #endif
253 	/* create isakmp CR payload */
254 	if (need_cr)
255 		plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);
256 
257 #ifdef ENABLE_FRAG
258 	if (vid_frag)
259 		plist = isakmp_plist_append(plist, vid_frag, ISAKMP_NPTYPE_VID);
260 #endif
261 #ifdef ENABLE_NATT
262 	/*
263 	 * set VID payload for NAT-T if NAT-T
264 	 * support allowed in the config file
265 	 */
266 	if (iph1->rmconf->nat_traversal)
267 		plist = isakmp_plist_append_natt_vids(plist, vid_natt);
268 #endif
269 #ifdef ENABLE_HYBRID
270 	if (vid_xauth)
271 		plist = isakmp_plist_append(plist,
272 		    vid_xauth, ISAKMP_NPTYPE_VID);
273 	if (vid_unity)
274 		plist = isakmp_plist_append(plist,
275 		    vid_unity, ISAKMP_NPTYPE_VID);
276 #endif
277 #ifdef ENABLE_DPD
278 	if(iph1->rmconf->dpd){
279 		vid_dpd = set_vendorid(VENDORID_DPD);
280 		if (vid_dpd != NULL)
281 			plist = isakmp_plist_append(plist, vid_dpd, ISAKMP_NPTYPE_VID);
282 	}
283 #endif
284 
285 	iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
286 
287 #ifdef HAVE_PRINT_ISAKMP_C
288 	isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
289 #endif
290 
291 	/* send the packet, add to the schedule to resend */
292 	iph1->retry_counter = iph1->rmconf->retry_counter;
293 	if (isakmp_ph1resend(iph1) == -1)
294 		goto end;
295 
296 	iph1->status = PHASE1ST_MSG1SENT;
297 
298 	error = 0;
299 
300 end:
301 	if (cr)
302 		vfree(cr);
303 #ifdef HAVE_GSSAPI
304 	if (gsstoken)
305 		vfree(gsstoken);
306 #endif
307 #ifdef ENABLE_FRAG
308 	if (vid_frag)
309 		vfree(vid_frag);
310 #endif
311 #ifdef ENABLE_NATT
312 	for (i = 0; i < MAX_NATT_VID_COUNT && vid_natt[i] != NULL; i++)
313 		vfree(vid_natt[i]);
314 #endif
315 #ifdef ENABLE_HYBRID
316 	if (vid_xauth != NULL)
317 		vfree(vid_xauth);
318 	if (vid_unity != NULL)
319 		vfree(vid_unity);
320 #endif
321 #ifdef ENABLE_DPD
322 	if (vid_dpd != NULL)
323 		vfree(vid_dpd);
324 #endif
325 
326 	return error;
327 }
328 
329 /*
330  * receive from responder
331  * 	psk: HDR, SA, KE, Nr, IDr1, HASH_R
332  * 	sig: HDR, SA, KE, Nr, IDr1, [ CR, ] [ CERT, ] SIG_R
333  *   gssapi: HDR, SA, KE, Nr, IDr1, GSSr, HASH_R
334  * 	rsa: HDR, SA, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i, HASH_R
335  * 	rev: HDR, SA, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDir_b>Ke_r, HASH_R
336  */
337 int
agg_i2recv(iph1,msg)338 agg_i2recv(iph1, msg)
339 	struct ph1handle *iph1;
340 	vchar_t *msg;
341 {
342 	vchar_t *pbuf = NULL;
343 	struct isakmp_parse_t *pa;
344 	vchar_t *satmp = NULL;
345 	int error = -1;
346 	int vid_numeric;
347 	int ptype;
348 #ifdef ENABLE_HYBRID
349 	vchar_t *unity_vid;
350 	vchar_t *xauth_vid;
351 #endif
352 #ifdef HAVE_GSSAPI
353 	vchar_t *gsstoken = NULL;
354 #endif
355 
356 #ifdef ENABLE_NATT
357 	int natd_seq = 0;
358 	struct natd_payload {
359 		int seq;
360 		vchar_t *payload;
361 		TAILQ_ENTRY(natd_payload) chain;
362 	};
363 	TAILQ_HEAD(_natd_payload, natd_payload) natd_tree;
364 	TAILQ_INIT(&natd_tree);
365 #endif
366 
367 	/* validity check */
368 	if (iph1->status != PHASE1ST_MSG1SENT) {
369 		plog(LLV_ERROR, LOCATION, NULL,
370 			"status mismatched %d.\n", iph1->status);
371 		goto end;
372 	}
373 
374 	/* validate the type of next payload */
375 	pbuf = isakmp_parse(msg);
376 	if (pbuf == NULL)
377 		goto end;
378 	pa = (struct isakmp_parse_t *)pbuf->v;
379 
380 	iph1->pl_hash = NULL;
381 
382 	/* SA payload is fixed postion */
383 	if (pa->type != ISAKMP_NPTYPE_SA) {
384 		plog(LLV_ERROR, LOCATION, iph1->remote,
385 			"received invalid next payload type %d, "
386 			"expecting %d.\n",
387 			pa->type, ISAKMP_NPTYPE_SA);
388 		goto end;
389 	}
390 
391 	if (isakmp_p2ph(&satmp, pa->ptr) < 0)
392 		goto end;
393 	pa++;
394 
395 	for (/*nothing*/;
396 	     pa->type != ISAKMP_NPTYPE_NONE;
397 	     pa++) {
398 
399 		switch (pa->type) {
400 		case ISAKMP_NPTYPE_KE:
401 			if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
402 				goto end;
403 			break;
404 		case ISAKMP_NPTYPE_NONCE:
405 			if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
406 				goto end;
407 			break;
408 		case ISAKMP_NPTYPE_ID:
409 			if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
410 				goto end;
411 			break;
412 		case ISAKMP_NPTYPE_HASH:
413 			iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
414 			break;
415 		case ISAKMP_NPTYPE_CR:
416 			if (oakley_savecr(iph1, pa->ptr) < 0)
417 				goto end;
418 			break;
419 		case ISAKMP_NPTYPE_CERT:
420 			if (oakley_savecert(iph1, pa->ptr) < 0)
421 				goto end;
422 			break;
423 		case ISAKMP_NPTYPE_SIG:
424 			if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
425 				goto end;
426 			break;
427 		case ISAKMP_NPTYPE_VID:
428 			handle_vendorid(iph1, pa->ptr);
429 			break;
430 		case ISAKMP_NPTYPE_N:
431 			isakmp_check_notify(pa->ptr, iph1);
432 			break;
433 #ifdef HAVE_GSSAPI
434 		case ISAKMP_NPTYPE_GSS:
435 			if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
436 				goto end;
437 			gssapi_save_received_token(iph1, gsstoken);
438 			break;
439 #endif
440 
441 #ifdef ENABLE_NATT
442 		case ISAKMP_NPTYPE_NATD_DRAFT:
443 		case ISAKMP_NPTYPE_NATD_RFC:
444 			if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
445 			    pa->type == iph1->natt_options->payload_nat_d) {
446 				struct natd_payload *natd;
447 				natd = (struct natd_payload *)racoon_malloc(sizeof(*natd));
448 				if (!natd)
449 					goto end;
450 
451 				natd->payload = NULL;
452 
453 				if (isakmp_p2ph (&natd->payload, pa->ptr) < 0)
454 					goto end;
455 
456 				natd->seq = natd_seq++;
457 
458 				TAILQ_INSERT_TAIL(&natd_tree, natd, chain);
459 				break;
460 			}
461 			/* passthrough to default... */
462 #endif
463 
464 		default:
465 			/* don't send information, see isakmp_ident_r1() */
466 			plog(LLV_ERROR, LOCATION, iph1->remote,
467 				"ignore the packet, "
468 				"received unexpecting payload type %d.\n",
469 				pa->type);
470 			goto end;
471 		}
472 	}
473 
474 	/* payload existency check */
475 	if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
476 		plog(LLV_ERROR, LOCATION, iph1->remote,
477 			"few isakmp message received.\n");
478 		goto end;
479 	}
480 
481 	/* verify identifier */
482 	if (ipsecdoi_checkid1(iph1) != 0) {
483 		plog(LLV_ERROR, LOCATION, iph1->remote,
484 			"invalid ID payload.\n");
485 		goto end;
486 	}
487 
488 	/* check SA payload and set approval SA for use */
489 	if (ipsecdoi_checkph1proposal(satmp, iph1) < 0) {
490 		plog(LLV_ERROR, LOCATION, iph1->remote,
491 			"failed to get valid proposal.\n");
492 		/* XXX send information */
493 		goto end;
494 	}
495 	VPTRINIT(iph1->sa_ret);
496 
497 	/* fix isakmp index */
498 	memcpy(&iph1->index.r_ck, &((struct isakmp *)msg->v)->r_ck,
499 		sizeof(cookie_t));
500 
501 #ifdef ENABLE_NATT
502 	if (NATT_AVAILABLE(iph1)) {
503 		struct natd_payload *natd = NULL;
504 		int natd_verified;
505 
506 		plog(LLV_INFO, LOCATION, iph1->remote,
507 		     "Selected NAT-T version: %s\n",
508 		     vid_string_by_id(iph1->natt_options->version));
509 
510 		/* set both bits first so that we can clear them
511 		   upon verifying hashes */
512 		iph1->natt_flags |= NAT_DETECTED;
513 
514 		while ((natd = TAILQ_FIRST(&natd_tree)) != NULL) {
515 			/* this function will clear appropriate bits bits
516 			   from iph1->natt_flags */
517 			natd_verified = natt_compare_addr_hash (iph1,
518 				natd->payload, natd->seq);
519 
520 			plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
521 				natd->seq - 1,
522 				natd_verified ? "verified" : "doesn't match");
523 
524 			vfree (natd->payload);
525 
526 			TAILQ_REMOVE(&natd_tree, natd, chain);
527 			racoon_free (natd);
528 		}
529 
530 		plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
531 		      iph1->natt_flags & NAT_DETECTED ?
532 		      		"detected:" : "not detected",
533 		      iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
534 		      iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
535 
536 		if (iph1->natt_flags & NAT_DETECTED)
537 			natt_float_ports (iph1);
538 	}
539 #endif
540 
541 	/* compute sharing secret of DH */
542 	if (oakley_dh_compute(iph1->rmconf->dhgrp, iph1->dhpub,
543 				iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
544 		goto end;
545 
546 	/* generate SKEYIDs & IV & final cipher key */
547 	if (oakley_skeyid(iph1) < 0)
548 		goto end;
549 	if (oakley_skeyid_dae(iph1) < 0)
550 		goto end;
551 	if (oakley_compute_enckey(iph1) < 0)
552 		goto end;
553 	if (oakley_newiv(iph1) < 0)
554 		goto end;
555 
556 	/* validate authentication value */
557 	ptype = oakley_validate_auth(iph1);
558 	if (ptype != 0) {
559 		if (ptype == -1) {
560 			/* message printed inner oakley_validate_auth() */
561 			goto end;
562 		}
563 		EVT_PUSH(iph1->local, iph1->remote,
564 		    EVTT_PEERPH1AUTH_FAILED, NULL);
565 		isakmp_info_send_n1(iph1, ptype, NULL);
566 		goto end;
567 	}
568 
569 	if (oakley_checkcr(iph1) < 0) {
570 		/* Ignore this error in order to be interoperability. */
571 		;
572 	}
573 
574 	/* change status of isakmp status entry */
575 	iph1->status = PHASE1ST_MSG2RECEIVED;
576 
577 	error = 0;
578 
579 end:
580 #ifdef HAVE_GSSAPI
581 	if (gsstoken)
582 		vfree(gsstoken);
583 #endif
584 	if (pbuf)
585 		vfree(pbuf);
586 	if (satmp)
587 		vfree(satmp);
588 	if (error) {
589 		VPTRINIT(iph1->dhpub_p);
590 		VPTRINIT(iph1->nonce_p);
591 		VPTRINIT(iph1->id_p);
592 		oakley_delcert(iph1->cert_p);
593 		iph1->cert_p = NULL;
594 		oakley_delcert(iph1->crl_p);
595 		iph1->crl_p = NULL;
596 		VPTRINIT(iph1->sig_p);
597 		oakley_delcert(iph1->cr_p);
598 		iph1->cr_p = NULL;
599 	}
600 
601 	return error;
602 }
603 
604 /*
605  * send to responder
606  * 	psk: HDR, HASH_I
607  *   gssapi: HDR, HASH_I
608  * 	sig: HDR, [ CERT, ] SIG_I
609  * 	rsa: HDR, HASH_I
610  * 	rev: HDR, HASH_I
611  */
612 int
agg_i2send(iph1,msg)613 agg_i2send(iph1, msg)
614 	struct ph1handle *iph1;
615 	vchar_t *msg;
616 {
617 	struct payload_list *plist = NULL;
618 	int need_cert = 0;
619 	int error = -1;
620 	vchar_t *gsshash = NULL;
621 
622 	/* validity check */
623 	if (iph1->status != PHASE1ST_MSG2RECEIVED) {
624 		plog(LLV_ERROR, LOCATION, NULL,
625 			"status mismatched %d.\n", iph1->status);
626 		goto end;
627 	}
628 
629 	/* generate HASH to send */
630 	plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_I\n");
631 	iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
632 	if (iph1->hash == NULL) {
633 #ifdef HAVE_GSSAPI
634 		if (gssapi_more_tokens(iph1) &&
635 #ifdef ENABLE_HYBRID
636 		    !iph1->rmconf->xauth &&
637 #endif
638 		    1)
639 			isakmp_info_send_n1(iph1,
640 			    ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
641 #endif
642 		goto end;
643 	}
644 
645 	switch (AUTHMETHOD(iph1)) {
646 	case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
647 #ifdef ENABLE_HYBRID
648 	case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I:
649 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
650 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
651 #endif
652 		/* set HASH payload */
653 		plist = isakmp_plist_append(plist,
654 		    iph1->hash, ISAKMP_NPTYPE_HASH);
655 		break;
656 
657 	case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
658 	case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
659 #ifdef ENABLE_HYBRID
660 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
661 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
662 #endif
663 		/* XXX if there is CR or not ? */
664 
665 		if (oakley_getmycert(iph1) < 0)
666 			goto end;
667 
668 		if (oakley_getsign(iph1) < 0)
669 			goto end;
670 
671 		if (iph1->cert != NULL && iph1->rmconf->send_cert)
672 			need_cert = 1;
673 
674 		/* add CERT payload if there */
675 		if (need_cert)
676 			plist = isakmp_plist_append(plist,
677 			    iph1->cert->pl, ISAKMP_NPTYPE_CERT);
678 
679 		/* add SIG payload */
680 		plist = isakmp_plist_append(plist,
681 		    iph1->sig, ISAKMP_NPTYPE_SIG);
682 		break;
683 
684 	case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
685 	case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
686 #ifdef ENABLE_HYBRID
687 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
688 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
689 #endif
690 		break;
691 #ifdef HAVE_GSSAPI
692 	case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
693 		gsshash = gssapi_wraphash(iph1);
694 		if (gsshash == NULL) {
695 			plog(LLV_ERROR, LOCATION, NULL,
696 				"failed to wrap hash\n");
697 			isakmp_info_send_n1(iph1,
698 				ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
699 			goto end;
700 		}
701 
702 		plist = isakmp_plist_append(plist,
703 		    gsshash, ISAKMP_NPTYPE_HASH);
704 		break;
705 #endif
706 	}
707 
708 #ifdef ENABLE_NATT
709 	/* generate NAT-D payloads */
710 	if (NATT_AVAILABLE(iph1)) {
711 		vchar_t *natd[2] = { NULL, NULL };
712 
713 		plog(LLV_INFO, LOCATION,
714 		    NULL, "Adding remote and local NAT-D payloads.\n");
715 
716 		if ((natd[0] = natt_hash_addr (iph1, iph1->remote)) == NULL) {
717 			plog(LLV_ERROR, LOCATION, NULL,
718 			    "NAT-D hashing failed for %s\n",
719 			    saddr2str(iph1->remote));
720 			goto end;
721 		}
722 
723 		if ((natd[1] = natt_hash_addr (iph1, iph1->local)) == NULL) {
724 			plog(LLV_ERROR, LOCATION, NULL,
725 			    "NAT-D hashing failed for %s\n",
726 			    saddr2str(iph1->local));
727 			goto end;
728 		}
729 
730 		plist = isakmp_plist_append(plist,
731 		    natd[0], iph1->natt_options->payload_nat_d);
732 		plist = isakmp_plist_append(plist,
733 		    natd[1], iph1->natt_options->payload_nat_d);
734 	}
735 #endif
736 
737 	iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
738 
739 #ifdef HAVE_PRINT_ISAKMP_C
740 	isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
741 #endif
742 
743 	/* send to responder */
744 	if (isakmp_send(iph1, iph1->sendbuf) < 0)
745 		goto end;
746 
747 	/* the sending message is added to the received-list. */
748 	if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
749 		plog(LLV_ERROR , LOCATION, NULL,
750 			"failed to add a response packet to the tree.\n");
751 		goto end;
752 	}
753 
754 	/* set encryption flag */
755 	iph1->flags |= ISAKMP_FLAG_E;
756 
757 	iph1->status = PHASE1ST_ESTABLISHED;
758 
759 	error = 0;
760 
761 end:
762 	if (gsshash)
763 		vfree(gsshash);
764 	return error;
765 }
766 
767 /*
768  * receive from initiator
769  * 	psk: HDR, SA, KE, Ni, IDi1
770  * 	sig: HDR, SA, KE, Ni, IDi1 [, CR ]
771  *   gssapi: HDR, SA, KE, Ni, IDi1 , GSSi
772  * 	rsa: HDR, SA, [ HASH(1),] KE, <IDi1_b>Pubkey_r, <Ni_b>Pubkey_r
773  * 	rev: HDR, SA, [ HASH(1),] <Ni_b>Pubkey_r, <KE_b>Ke_i,
774  * 	     <IDii_b>Ke_i [, <Cert-I_b>Ke_i ]
775  */
776 int
agg_r1recv(iph1,msg)777 agg_r1recv(iph1, msg)
778 	struct ph1handle *iph1;
779 	vchar_t *msg;
780 {
781 	int error = -1;
782 	vchar_t *pbuf = NULL;
783 	struct isakmp_parse_t *pa;
784 	int vid_numeric;
785 #ifdef HAVE_GSSAPI
786 	vchar_t *gsstoken = NULL;
787 #endif
788 
789 	/* validity check */
790 	if (iph1->status != PHASE1ST_START) {
791 		plog(LLV_ERROR, LOCATION, NULL,
792 			"status mismatched %d.\n", iph1->status);
793 		goto end;
794 	}
795 
796 	/* validate the type of next payload */
797 	pbuf = isakmp_parse(msg);
798 	if (pbuf == NULL)
799 		goto end;
800 	pa = (struct isakmp_parse_t *)pbuf->v;
801 
802 	/* SA payload is fixed postion */
803 	if (pa->type != ISAKMP_NPTYPE_SA) {
804 		plog(LLV_ERROR, LOCATION, iph1->remote,
805 			"received invalid next payload type %d, "
806 			"expecting %d.\n",
807 			pa->type, ISAKMP_NPTYPE_SA);
808 		goto end;
809 	}
810 	if (isakmp_p2ph(&iph1->sa, pa->ptr) < 0)
811 		goto end;
812 	pa++;
813 
814 	for (/*nothing*/;
815 	     pa->type != ISAKMP_NPTYPE_NONE;
816 	     pa++) {
817 
818 		plog(LLV_DEBUG, LOCATION, NULL,
819 			"received payload of type %s\n",
820 			s_isakmp_nptype(pa->type));
821 
822 		switch (pa->type) {
823 		case ISAKMP_NPTYPE_KE:
824 			if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
825 				goto end;
826 			break;
827 		case ISAKMP_NPTYPE_NONCE:
828 			if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
829 				goto end;
830 			break;
831 		case ISAKMP_NPTYPE_ID:
832 			if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
833 				goto end;
834 			break;
835 		case ISAKMP_NPTYPE_VID:
836 			vid_numeric = handle_vendorid(iph1, pa->ptr);
837 #ifdef ENABLE_FRAG
838 			if ((vid_numeric == VENDORID_FRAG) &&
839 			    (vendorid_frag_cap(pa->ptr) & VENDORID_FRAG_AGG))
840 				iph1->frag = 1;
841 #endif
842 			break;
843 
844 		case ISAKMP_NPTYPE_CR:
845 			if (oakley_savecr(iph1, pa->ptr) < 0)
846 				goto end;
847 			break;
848 
849 #ifdef HAVE_GSSAPI
850 		case ISAKMP_NPTYPE_GSS:
851 			if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
852 				goto end;
853 			gssapi_save_received_token(iph1, gsstoken);
854 			break;
855 #endif
856 		default:
857 			/* don't send information, see isakmp_ident_r1() */
858 			plog(LLV_ERROR, LOCATION, iph1->remote,
859 				"ignore the packet, "
860 				"received unexpecting payload type %d.\n",
861 				pa->type);
862 			goto end;
863 		}
864 	}
865 
866 	/* payload existency check */
867 	if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
868 		plog(LLV_ERROR, LOCATION, iph1->remote,
869 			"few isakmp message received.\n");
870 		goto end;
871 	}
872 
873 	/* verify identifier */
874 	if (ipsecdoi_checkid1(iph1) != 0) {
875 		plog(LLV_ERROR, LOCATION, iph1->remote,
876 			"invalid ID payload.\n");
877 		goto end;
878 	}
879 
880 #ifdef ENABLE_NATT
881 	if (NATT_AVAILABLE(iph1))
882 		plog(LLV_INFO, LOCATION, iph1->remote,
883 		     "Selected NAT-T version: %s\n",
884 		     vid_string_by_id(iph1->natt_options->version));
885 #endif
886 
887 	/* check SA payload and set approval SA for use */
888 	if (ipsecdoi_checkph1proposal(iph1->sa, iph1) < 0) {
889 		plog(LLV_ERROR, LOCATION, iph1->remote,
890 			"failed to get valid proposal.\n");
891 		/* XXX send information */
892 		goto end;
893 	}
894 
895 	if (oakley_checkcr(iph1) < 0) {
896 		/* Ignore this error in order to be interoperability. */
897 		;
898 	}
899 
900 	iph1->status = PHASE1ST_MSG1RECEIVED;
901 
902 	error = 0;
903 
904 end:
905 #ifdef HAVE_GSSAPI
906 	if (gsstoken)
907 		vfree(gsstoken);
908 #endif
909 	if (pbuf)
910 		vfree(pbuf);
911 	if (error) {
912 		VPTRINIT(iph1->sa);
913 		VPTRINIT(iph1->dhpub_p);
914 		VPTRINIT(iph1->nonce_p);
915 		VPTRINIT(iph1->id_p);
916 		oakley_delcert(iph1->cr_p);
917 		iph1->cr_p = NULL;
918 	}
919 
920 	return error;
921 }
922 
923 /*
924  * send to initiator
925  * 	psk: HDR, SA, KE, Nr, IDr1, HASH_R
926  * 	sig: HDR, SA, KE, Nr, IDr1, [ CR, ] [ CERT, ] SIG_R
927  *   gssapi: HDR, SA, KE, Nr, IDr1, GSSr, HASH_R
928  * 	rsa: HDR, SA, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i, HASH_R
929  * 	rev: HDR, SA, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDir_b>Ke_r, HASH_R
930  */
931 int
agg_r1send(iph1,msg)932 agg_r1send(iph1, msg)
933 	struct ph1handle *iph1;
934 	vchar_t *msg;
935 {
936 	struct payload_list *plist = NULL;
937 	int need_cr = 0;
938 	int need_cert = 0;
939 	vchar_t *cr = NULL;
940 	int error = -1;
941 #ifdef ENABLE_HYBRID
942 	vchar_t *xauth_vid = NULL;
943 	vchar_t *unity_vid = NULL;
944 #endif
945 #ifdef ENABLE_NATT
946 	vchar_t *vid_natt = NULL;
947 	vchar_t *natd[2] = { NULL, NULL };
948 #endif
949 #ifdef ENABLE_DPD
950 	vchar_t *vid_dpd = NULL;
951 #endif
952 #ifdef ENABLE_FRAG
953 	vchar_t *vid_frag = NULL;
954 #endif
955 
956 #ifdef HAVE_GSSAPI
957 	int gsslen;
958 	vchar_t *gsstoken = NULL, *gsshash = NULL;
959 	vchar_t *gss_sa = NULL;
960 	int free_gss_sa = 0;
961 #endif
962 
963 	/* validity check */
964 	if (iph1->status != PHASE1ST_MSG1RECEIVED) {
965 		plog(LLV_ERROR, LOCATION, NULL,
966 			"status mismatched %d.\n", iph1->status);
967 		goto end;
968 	}
969 
970 	/* set responder's cookie */
971 	isakmp_newcookie((caddr_t)&iph1->index.r_ck, iph1->remote, iph1->local);
972 
973 	/* make ID payload into isakmp status */
974 	if (ipsecdoi_setid1(iph1) < 0)
975 		goto end;
976 
977 	/* generate DH public value */
978 	if (oakley_dh_generate(iph1->rmconf->dhgrp,
979 				&iph1->dhpub, &iph1->dhpriv) < 0)
980 		goto end;
981 
982 	/* generate NONCE value */
983 	iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
984 	if (iph1->nonce == NULL)
985 		goto end;
986 
987 	/* compute sharing secret of DH */
988 	if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
989 				iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
990 		goto end;
991 
992 	/* generate SKEYIDs & IV & final cipher key */
993 	if (oakley_skeyid(iph1) < 0)
994 		goto end;
995 	if (oakley_skeyid_dae(iph1) < 0)
996 		goto end;
997 	if (oakley_compute_enckey(iph1) < 0)
998 		goto end;
999 	if (oakley_newiv(iph1) < 0)
1000 		goto end;
1001 
1002 #ifdef HAVE_GSSAPI
1003 	if (RMAUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1004 		gssapi_get_rtoken(iph1, &gsslen);
1005 #endif
1006 
1007 	/* generate HASH to send */
1008 	plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_R\n");
1009 	iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
1010 	if (iph1->hash == NULL) {
1011 #ifdef HAVE_GSSAPI
1012 		if (gssapi_more_tokens(iph1))
1013 			isakmp_info_send_n1(iph1,
1014 			    ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
1015 #endif
1016 		goto end;
1017 	}
1018 
1019 	/* create CR if need */
1020 	if (iph1->rmconf->send_cr
1021 	 && oakley_needcr(iph1->approval->authmethod)
1022 	 && iph1->rmconf->peerscertfile == NULL) {
1023 		need_cr = 1;
1024 		cr = oakley_getcr(iph1);
1025 		if (cr == NULL) {
1026 			plog(LLV_ERROR, LOCATION, NULL,
1027 				"failed to get cr buffer.\n");
1028 			goto end;
1029 		}
1030 	}
1031 
1032 #ifdef ENABLE_NATT
1033 	/* Has the peer announced NAT-T? */
1034 	if (NATT_AVAILABLE(iph1)) {
1035 	  	/* set chosen VID */
1036 		vid_natt = set_vendorid(iph1->natt_options->version);
1037 
1038 		/* generate NAT-D payloads */
1039 		plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
1040 		if ((natd[0] = natt_hash_addr (iph1, iph1->remote)) == NULL) {
1041 			plog(LLV_ERROR, LOCATION, NULL,
1042 				"NAT-D hashing failed for %s\n", saddr2str(iph1->remote));
1043 			goto end;
1044 		}
1045 
1046 		if ((natd[1] = natt_hash_addr (iph1, iph1->local)) == NULL) {
1047 			plog(LLV_ERROR, LOCATION, NULL,
1048 				"NAT-D hashing failed for %s\n", saddr2str(iph1->local));
1049 			goto end;
1050 		}
1051 	}
1052 #endif
1053 #ifdef ENABLE_DPD
1054 	/* Only send DPD support if remote announced DPD and if DPD support is active */
1055 	if (iph1->dpd_support && iph1->rmconf->dpd)
1056 		vid_dpd = set_vendorid(VENDORID_DPD);
1057 #endif
1058 #ifdef ENABLE_FRAG
1059 	if (iph1->frag) {
1060 		vid_frag = set_vendorid(VENDORID_FRAG);
1061 		if (vid_frag != NULL)
1062 			vid_frag = isakmp_frag_addcap(vid_frag,
1063 			    VENDORID_FRAG_AGG);
1064 		if (vid_frag == NULL)
1065 			plog(LLV_ERROR, LOCATION, NULL,
1066 			    "Frag vendorID construction failed\n");
1067 	}
1068 #endif
1069 
1070 	switch (AUTHMETHOD(iph1)) {
1071 	case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
1072 #ifdef ENABLE_HYBRID
1073 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
1074 #endif
1075 		/* set SA payload to reply */
1076 		plist = isakmp_plist_append(plist,
1077 		    iph1->sa_ret, ISAKMP_NPTYPE_SA);
1078 
1079 		/* create isakmp KE payload */
1080 		plist = isakmp_plist_append(plist,
1081 		    iph1->dhpub, ISAKMP_NPTYPE_KE);
1082 
1083 		/* create isakmp NONCE payload */
1084 		plist = isakmp_plist_append(plist,
1085 		    iph1->nonce, ISAKMP_NPTYPE_NONCE);
1086 
1087 		/* create isakmp ID payload */
1088 		plist = isakmp_plist_append(plist,
1089 		    iph1->id, ISAKMP_NPTYPE_ID);
1090 
1091 		/* create isakmp HASH payload */
1092 		plist = isakmp_plist_append(plist,
1093 		    iph1->hash, ISAKMP_NPTYPE_HASH);
1094 
1095 		/* create isakmp CR payload if needed */
1096 		if (need_cr)
1097 			plist = isakmp_plist_append(plist,
1098 			    cr, ISAKMP_NPTYPE_CR);
1099 		break;
1100 	case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
1101 	case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
1102 #ifdef ENABLE_HYBRID
1103 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
1104 	case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
1105 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
1106 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
1107 #endif
1108 		/* XXX if there is CR or not ? */
1109 
1110 		if (oakley_getmycert(iph1) < 0)
1111 			goto end;
1112 
1113 		if (oakley_getsign(iph1) < 0)
1114 			goto end;
1115 
1116 		if (iph1->cert != NULL && iph1->rmconf->send_cert)
1117 			need_cert = 1;
1118 
1119 		/* set SA payload to reply */
1120 		plist = isakmp_plist_append(plist,
1121 		    iph1->sa_ret, ISAKMP_NPTYPE_SA);
1122 
1123 		/* create isakmp KE payload */
1124 		plist = isakmp_plist_append(plist,
1125 		    iph1->dhpub, ISAKMP_NPTYPE_KE);
1126 
1127 		/* create isakmp NONCE payload */
1128 		plist = isakmp_plist_append(plist,
1129 		    iph1->nonce, ISAKMP_NPTYPE_NONCE);
1130 
1131 		/* add ID payload */
1132 		plist = isakmp_plist_append(plist,
1133 		    iph1->id, ISAKMP_NPTYPE_ID);
1134 
1135 		/* add CERT payload if there */
1136 		if (need_cert)
1137 			plist = isakmp_plist_append(plist,
1138 			    iph1->cert->pl, ISAKMP_NPTYPE_CERT);
1139 
1140 		/* add SIG payload */
1141 		plist = isakmp_plist_append(plist,
1142 		    iph1->sig, ISAKMP_NPTYPE_SIG);
1143 
1144 		/* create isakmp CR payload if needed */
1145 		if (need_cr)
1146 			plist = isakmp_plist_append(plist,
1147 			    cr, ISAKMP_NPTYPE_CR);
1148 		break;
1149 
1150 	case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
1151 	case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
1152 #ifdef ENABLE_HYBRID
1153 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
1154 	case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
1155 #endif
1156 		break;
1157 #ifdef HAVE_GSSAPI
1158 	case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
1159 			/* create buffer to send isakmp payload */
1160 			gsshash = gssapi_wraphash(iph1);
1161 			if (gsshash == NULL) {
1162 				plog(LLV_ERROR, LOCATION, NULL,
1163 					"failed to wrap hash\n");
1164 				/*
1165 				 * This is probably due to the GSS
1166 				 * roundtrips not being finished yet.
1167 				 * Return this error in the hope that
1168 				 * a fallback to main mode will be done.
1169 				 */
1170 				isakmp_info_send_n1(iph1,
1171 				    ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE, NULL);
1172 				goto end;
1173 			}
1174 			if (iph1->approval->gssid != NULL)
1175 				gss_sa =
1176 				    ipsecdoi_setph1proposal(iph1->approval);
1177 			else
1178 				gss_sa = iph1->sa_ret;
1179 
1180 			if (gss_sa != iph1->sa_ret)
1181 				free_gss_sa = 1;
1182 
1183 			/* set SA payload to reply */
1184 			plist = isakmp_plist_append(plist,
1185 			    gss_sa, ISAKMP_NPTYPE_SA);
1186 
1187 			/* create isakmp KE payload */
1188 			plist = isakmp_plist_append(plist,
1189 			    iph1->dhpub, ISAKMP_NPTYPE_KE);
1190 
1191 			/* create isakmp NONCE payload */
1192 			plist = isakmp_plist_append(plist,
1193 			    iph1->nonce, ISAKMP_NPTYPE_NONCE);
1194 
1195 			/* create isakmp ID payload */
1196 			plist = isakmp_plist_append(plist,
1197 			    iph1->id, ISAKMP_NPTYPE_ID);
1198 
1199 			/* create GSS payload */
1200 			gssapi_get_token_to_send(iph1, &gsstoken);
1201 			plist = isakmp_plist_append(plist,
1202 			    gsstoken, ISAKMP_NPTYPE_GSS);
1203 
1204 			/* create isakmp HASH payload */
1205 			plist = isakmp_plist_append(plist,
1206 			    gsshash, ISAKMP_NPTYPE_HASH);
1207 
1208 			/* append vendor id, if needed */
1209 			break;
1210 #endif
1211 	}
1212 
1213 #ifdef ENABLE_HYBRID
1214 	if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) {
1215 		plog (LLV_INFO, LOCATION, NULL, "Adding xauth VID payload.\n");
1216 		if ((xauth_vid = set_vendorid(VENDORID_XAUTH)) == NULL) {
1217 			plog(LLV_ERROR, LOCATION, NULL,
1218 			    "Cannot create Xauth vendor ID\n");
1219 			goto end;
1220 		}
1221 		plist = isakmp_plist_append(plist,
1222 		    xauth_vid, ISAKMP_NPTYPE_VID);
1223 	}
1224 
1225 	if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_UNITY) {
1226 		if ((unity_vid = set_vendorid(VENDORID_UNITY)) == NULL) {
1227 			plog(LLV_ERROR, LOCATION, NULL,
1228 			    "Cannot create Unity vendor ID\n");
1229 			goto end;
1230 		}
1231 		plist = isakmp_plist_append(plist,
1232 		    unity_vid, ISAKMP_NPTYPE_VID);
1233 	}
1234 #endif
1235 
1236 #ifdef ENABLE_NATT
1237 	/* append NAT-T payloads */
1238 	if (vid_natt) {
1239 		/* chosen VID */
1240 		plist = isakmp_plist_append(plist, vid_natt, ISAKMP_NPTYPE_VID);
1241 		/* NAT-D */
1242 		plist = isakmp_plist_append(plist, natd[0], iph1->natt_options->payload_nat_d);
1243 		plist = isakmp_plist_append(plist, natd[1], iph1->natt_options->payload_nat_d);
1244 	}
1245 #endif
1246 
1247 #ifdef ENABLE_FRAG
1248 	if (vid_frag)
1249 		plist = isakmp_plist_append(plist, vid_frag, ISAKMP_NPTYPE_VID);
1250 #endif
1251 
1252 #ifdef ENABLE_DPD
1253 	if (vid_dpd)
1254 		plist = isakmp_plist_append(plist, vid_dpd, ISAKMP_NPTYPE_VID);
1255 #endif
1256 
1257 	iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
1258 
1259 #ifdef HAVE_PRINT_ISAKMP_C
1260 	isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 1);
1261 #endif
1262 
1263 	/* send the packet, add to the schedule to resend */
1264 	iph1->retry_counter = iph1->rmconf->retry_counter;
1265 	if (isakmp_ph1resend(iph1) == -1)
1266 		goto end;
1267 
1268 	/* the sending message is added to the received-list. */
1269 	if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1270 		plog(LLV_ERROR , LOCATION, NULL,
1271 			"failed to add a response packet to the tree.\n");
1272 		goto end;
1273 	}
1274 
1275 	iph1->status = PHASE1ST_MSG1SENT;
1276 
1277 	error = 0;
1278 
1279 end:
1280 	if (cr)
1281 		vfree(cr);
1282 #ifdef ENABLE_HYBRID
1283 	if (xauth_vid)
1284 		vfree(xauth_vid);
1285 	if (unity_vid)
1286 		vfree(unity_vid);
1287 #endif
1288 #ifdef HAVE_GSSAPI
1289 	if (gsstoken)
1290 		vfree(gsstoken);
1291 	if (gsshash)
1292 		vfree(gsshash);
1293 	if (free_gss_sa)
1294 		vfree(gss_sa);
1295 #endif
1296 #ifdef ENABLE_DPD
1297 	if (vid_dpd)
1298 		vfree(vid_dpd);
1299 #endif
1300 #ifdef ENABLE_FRAG
1301 	if (vid_frag)
1302 		vfree(vid_frag);
1303 #endif
1304 
1305 	return error;
1306 }
1307 
1308 /*
1309  * receive from initiator
1310  * 	psk: HDR, HASH_I
1311  *   gssapi: HDR, HASH_I
1312  * 	sig: HDR, [ CERT, ] SIG_I
1313  * 	rsa: HDR, HASH_I
1314  * 	rev: HDR, HASH_I
1315  */
1316 int
agg_r2recv(iph1,msg0)1317 agg_r2recv(iph1, msg0)
1318 	struct ph1handle *iph1;
1319 	vchar_t *msg0;
1320 {
1321 	vchar_t *msg = NULL;
1322 	vchar_t *pbuf = NULL;
1323 	struct isakmp_parse_t *pa;
1324 	int error = -1;
1325 	int ptype;
1326 
1327 #ifdef ENABLE_NATT
1328 	int natd_seq = 0;
1329 #endif
1330 
1331 	/* validity check */
1332 	if (iph1->status != PHASE1ST_MSG1SENT) {
1333 		plog(LLV_ERROR, LOCATION, NULL,
1334 			"status mismatched %d.\n", iph1->status);
1335 		goto end;
1336 	}
1337 
1338 	/* decrypting if need. */
1339 	/* XXX configurable ? */
1340 	if (ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
1341 		msg = oakley_do_decrypt(iph1, msg0,
1342 					iph1->ivm->iv, iph1->ivm->ive);
1343 		if (msg == NULL)
1344 			goto end;
1345 	} else
1346 		msg = vdup(msg0);
1347 
1348 	/* validate the type of next payload */
1349 	pbuf = isakmp_parse(msg);
1350 	if (pbuf == NULL)
1351 		goto end;
1352 
1353 	iph1->pl_hash = NULL;
1354 
1355 	for (pa = (struct isakmp_parse_t *)pbuf->v;
1356 	     pa->type != ISAKMP_NPTYPE_NONE;
1357 	     pa++) {
1358 
1359 		switch (pa->type) {
1360 		case ISAKMP_NPTYPE_HASH:
1361 			iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
1362 			break;
1363 		case ISAKMP_NPTYPE_VID:
1364 			handle_vendorid(iph1, pa->ptr);
1365 			break;
1366 		case ISAKMP_NPTYPE_CERT:
1367 			if (oakley_savecert(iph1, pa->ptr) < 0)
1368 				goto end;
1369 			break;
1370 		case ISAKMP_NPTYPE_SIG:
1371 			if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
1372 				goto end;
1373 			break;
1374 		case ISAKMP_NPTYPE_N:
1375 			isakmp_check_notify(pa->ptr, iph1);
1376 			break;
1377 
1378 #ifdef ENABLE_NATT
1379 		case ISAKMP_NPTYPE_NATD_DRAFT:
1380 		case ISAKMP_NPTYPE_NATD_RFC:
1381 			if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
1382 				pa->type == iph1->natt_options->payload_nat_d)
1383 			{
1384 				vchar_t *natd_received = NULL;
1385 				int natd_verified;
1386 
1387 				if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
1388 					goto end;
1389 
1390 				if (natd_seq == 0)
1391 					iph1->natt_flags |= NAT_DETECTED;
1392 
1393 				natd_verified = natt_compare_addr_hash (iph1,
1394 					natd_received, natd_seq++);
1395 
1396 				plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
1397 					natd_seq - 1,
1398 					natd_verified ? "verified" : "doesn't match");
1399 
1400 				vfree (natd_received);
1401 				break;
1402 			}
1403 			/* passthrough to default... */
1404 #endif
1405 
1406 		default:
1407 			/* don't send information, see isakmp_ident_r1() */
1408 			plog(LLV_ERROR, LOCATION, iph1->remote,
1409 				"ignore the packet, "
1410 				"received unexpecting payload type %d.\n",
1411 				pa->type);
1412 			goto end;
1413 		}
1414 	}
1415 
1416 #ifdef ENABLE_NATT
1417 	if (NATT_AVAILABLE(iph1))
1418 		plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
1419 		      iph1->natt_flags & NAT_DETECTED ?
1420 		      		"detected:" : "not detected",
1421 		      iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
1422 		      iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
1423 #endif
1424 
1425 	/* validate authentication value */
1426 	ptype = oakley_validate_auth(iph1);
1427 	if (ptype != 0) {
1428 		if (ptype == -1) {
1429 			/* message printed inner oakley_validate_auth() */
1430 			goto end;
1431 		}
1432 		EVT_PUSH(iph1->local, iph1->remote,
1433 		    EVTT_PEERPH1AUTH_FAILED, NULL);
1434 		isakmp_info_send_n1(iph1, ptype, NULL);
1435 		goto end;
1436 	}
1437 
1438 	iph1->status = PHASE1ST_MSG2RECEIVED;
1439 
1440 	error = 0;
1441 
1442 end:
1443 	if (pbuf)
1444 		vfree(pbuf);
1445 	if (msg)
1446 		vfree(msg);
1447 	if (error) {
1448 		oakley_delcert(iph1->cert_p);
1449 		iph1->cert_p = NULL;
1450 		oakley_delcert(iph1->crl_p);
1451 		iph1->crl_p = NULL;
1452 		VPTRINIT(iph1->sig_p);
1453 	}
1454 
1455 	return error;
1456 }
1457 
1458 /*
1459  * status update and establish isakmp sa.
1460  */
1461 int
agg_r2send(iph1,msg)1462 agg_r2send(iph1, msg)
1463 	struct ph1handle *iph1;
1464 	vchar_t *msg;
1465 {
1466 	int error = -1;
1467 
1468 	/* validity check */
1469 	if (iph1->status != PHASE1ST_MSG2RECEIVED) {
1470 		plog(LLV_ERROR, LOCATION, NULL,
1471 			"status mismatched %d.\n", iph1->status);
1472 		goto end;
1473 	}
1474 
1475 	/* IV synchronized when packet encrypted. */
1476 	/* see handler.h about IV synchronization. */
1477 	if (ISSET(((struct isakmp *)msg->v)->flags, ISAKMP_FLAG_E))
1478 		memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->iv->l);
1479 
1480 	/* set encryption flag */
1481 	iph1->flags |= ISAKMP_FLAG_E;
1482 
1483 	iph1->status = PHASE1ST_ESTABLISHED;
1484 
1485 	error = 0;
1486 
1487 end:
1488 	return error;
1489 }
1490