1 /* $NetBSD: isakmp_inf.c,v 1.14.4.17 2009/05/18 17:07:46 tteras Exp $ */
2
3 /* Id: isakmp_inf.c,v 1.44 2006/05/06 20:45:52 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 #include "config.h"
35
36 #include <sys/types.h>
37 #include <sys/param.h>
38 #include <sys/socket.h>
39
40 #include <net/pfkeyv2.h>
41 #include <netinet/in.h>
42 #include <sys/queue.h>
43 #include PATH_IPSEC_H
44
45 #include <stdlib.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <errno.h>
49 #if TIME_WITH_SYS_TIME
50 # include <sys/time.h>
51 # include <time.h>
52 #else
53 # if HAVE_SYS_TIME_H
54 # include <sys/time.h>
55 # else
56 # include <time.h>
57 # endif
58 #endif
59 #ifdef ENABLE_HYBRID
60 #include <resolv.h>
61 #endif
62
63 #include "libpfkey.h"
64
65 #include "var.h"
66 #include "vmbuf.h"
67 #include "schedule.h"
68 #include "str2val.h"
69 #include "misc.h"
70 #include "plog.h"
71 #include "debug.h"
72
73 #include "localconf.h"
74 #include "remoteconf.h"
75 #include "sockmisc.h"
76 #include "handler.h"
77 #include "policy.h"
78 #include "proposal.h"
79 #include "isakmp_var.h"
80 #include "evt.h"
81 #include "isakmp.h"
82 #ifdef ENABLE_HYBRID
83 #include "isakmp_xauth.h"
84 #include "isakmp_unity.h"
85 #include "isakmp_cfg.h"
86 #endif
87 #include "isakmp_inf.h"
88 #include "oakley.h"
89 #include "ipsec_doi.h"
90 #include "crypto_openssl.h"
91 #include "pfkey.h"
92 #include "policy.h"
93 #include "algorithm.h"
94 #include "proposal.h"
95 #include "admin.h"
96 #include "strnames.h"
97 #ifdef ENABLE_NATT
98 #include "nattraversal.h"
99 #endif
100
101 /* information exchange */
102 static int isakmp_info_recv_n (struct ph1handle *, struct isakmp_pl_n *, u_int32_t, int);
103 static int isakmp_info_recv_d (struct ph1handle *, struct isakmp_pl_d *, u_int32_t, int);
104
105 #ifdef ENABLE_DPD
106 static int isakmp_info_recv_r_u __P((struct ph1handle *,
107 struct isakmp_pl_ru *, u_int32_t));
108 static int isakmp_info_recv_r_u_ack __P((struct ph1handle *,
109 struct isakmp_pl_ru *, u_int32_t));
110 static void isakmp_info_send_r_u __P((void *));
111 #endif
112
113 static void purge_isakmp_spi __P((int, isakmp_index *, size_t));
114 static void info_recv_initialcontact __P((struct ph1handle *));
115
116 /* %%%
117 * Information Exchange
118 */
119 /*
120 * receive Information
121 */
122 int
isakmp_info_recv(iph1,msg0)123 isakmp_info_recv(iph1, msg0)
124 struct ph1handle *iph1;
125 vchar_t *msg0;
126 {
127 vchar_t *msg = NULL;
128 vchar_t *pbuf = NULL;
129 u_int32_t msgid = 0;
130 int error = -1;
131 struct isakmp *isakmp;
132 struct isakmp_gen *gen;
133 struct isakmp_parse_t *pa, *pap;
134 void *p;
135 vchar_t *hash, *payload;
136 struct isakmp_gen *nd;
137 u_int8_t np;
138 int encrypted;
139
140 plog(LLV_DEBUG, LOCATION, NULL, "receive Information.\n");
141
142 encrypted = ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E);
143 msgid = ((struct isakmp *)msg0->v)->msgid;
144
145 /* Use new IV to decrypt Informational message. */
146 if (encrypted) {
147 struct isakmp_ivm *ivm;
148
149 if (iph1->ivm == NULL) {
150 plog(LLV_ERROR, LOCATION, NULL, "iph1->ivm == NULL\n");
151 return -1;
152 }
153
154 /* compute IV */
155 ivm = oakley_newiv2(iph1, ((struct isakmp *)msg0->v)->msgid);
156 if (ivm == NULL)
157 return -1;
158
159 msg = oakley_do_decrypt(iph1, msg0, ivm->iv, ivm->ive);
160 oakley_delivm(ivm);
161 if (msg == NULL)
162 return -1;
163
164 } else
165 msg = vdup(msg0);
166
167 /* Safety check */
168 if (msg->l < sizeof(*isakmp) + sizeof(*gen)) {
169 plog(LLV_ERROR, LOCATION, NULL,
170 "ignore information because the "
171 "message is way too short - %zu byte(s).\n", msg->l);
172 goto end;
173 }
174
175 isakmp = (struct isakmp *)msg->v;
176 gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp));
177 np = gen->np;
178
179 if (encrypted) {
180 if (isakmp->np != ISAKMP_NPTYPE_HASH) {
181 plog(LLV_ERROR, LOCATION, NULL,
182 "ignore information because the"
183 "message has no hash payload.\n");
184 goto end;
185 }
186
187 if (iph1->status != PHASE1ST_ESTABLISHED) {
188 plog(LLV_ERROR, LOCATION, NULL,
189 "ignore information because ISAKMP-SA"
190 "has not been established yet.\n");
191 goto end;
192 }
193
194 /* Safety check */
195 if (msg->l < sizeof(*isakmp) + ntohs(gen->len) + sizeof(*nd)) {
196 plog(LLV_ERROR, LOCATION, NULL,
197 "ignore information because the "
198 "message is too short - %zu byte(s).\n", msg->l);
199 goto end;
200 }
201
202 p = (caddr_t) gen + sizeof(struct isakmp_gen);
203 nd = (struct isakmp_gen *) ((caddr_t) gen + ntohs(gen->len));
204
205 /* nd length check */
206 if (ntohs(nd->len) > msg->l - (sizeof(struct isakmp) +
207 ntohs(gen->len))) {
208 plog(LLV_ERROR, LOCATION, NULL,
209 "too long payload length (broken message?)\n");
210 goto end;
211 }
212
213 if (ntohs(nd->len) < sizeof(*nd)) {
214 plog(LLV_ERROR, LOCATION, NULL,
215 "too short payload length (broken message?)\n");
216 goto end;
217 }
218
219 payload = vmalloc(ntohs(nd->len));
220 if (payload == NULL) {
221 plog(LLV_ERROR, LOCATION, NULL,
222 "cannot allocate memory\n");
223 goto end;
224 }
225
226 memcpy(payload->v, (caddr_t) nd, ntohs(nd->len));
227
228 /* compute HASH */
229 hash = oakley_compute_hash1(iph1, isakmp->msgid, payload);
230 if (hash == NULL) {
231 plog(LLV_ERROR, LOCATION, NULL,
232 "cannot compute hash\n");
233
234 vfree(payload);
235 goto end;
236 }
237
238 if (ntohs(gen->len) - sizeof(struct isakmp_gen) != hash->l) {
239 plog(LLV_ERROR, LOCATION, NULL,
240 "ignore information due to hash length mismatch\n");
241
242 vfree(hash);
243 vfree(payload);
244 goto end;
245 }
246
247 if (memcmp(p, hash->v, hash->l) != 0) {
248 plog(LLV_ERROR, LOCATION, NULL,
249 "ignore information due to hash mismatch\n");
250
251 vfree(hash);
252 vfree(payload);
253 goto end;
254 }
255
256 plog(LLV_DEBUG, LOCATION, NULL, "hash validated.\n");
257
258 vfree(hash);
259 vfree(payload);
260 } else {
261 /* make sure the packet was encrypted after the beginning of phase 1. */
262 switch (iph1->etype) {
263 case ISAKMP_ETYPE_AGG:
264 case ISAKMP_ETYPE_BASE:
265 case ISAKMP_ETYPE_IDENT:
266 if ((iph1->side == INITIATOR && iph1->status < PHASE1ST_MSG3SENT)
267 || (iph1->side == RESPONDER && iph1->status < PHASE1ST_MSG2SENT)) {
268 break;
269 }
270 /*FALLTHRU*/
271 default:
272 plog(LLV_ERROR, LOCATION, iph1->remote,
273 "%s message must be encrypted\n",
274 s_isakmp_nptype(np));
275 error = 0;
276 goto end;
277 }
278 }
279
280 if (!(pbuf = isakmp_parse(msg))) {
281 error = -1;
282 goto end;
283 }
284
285 error = 0;
286 for (pa = (struct isakmp_parse_t *)pbuf->v; pa->type; pa++) {
287 switch (pa->type) {
288 case ISAKMP_NPTYPE_HASH:
289 /* Handled above */
290 break;
291 case ISAKMP_NPTYPE_N:
292 error = isakmp_info_recv_n(iph1,
293 (struct isakmp_pl_n *)pa->ptr,
294 msgid, encrypted);
295 break;
296 case ISAKMP_NPTYPE_D:
297 error = isakmp_info_recv_d(iph1,
298 (struct isakmp_pl_d *)pa->ptr,
299 msgid, encrypted);
300 break;
301 case ISAKMP_NPTYPE_NONCE:
302 /* XXX to be 6.4.2 ike-01.txt */
303 /* XXX IV is to be synchronized. */
304 plog(LLV_ERROR, LOCATION, iph1->remote,
305 "ignore Acknowledged Informational\n");
306 break;
307 default:
308 /* don't send information, see isakmp_ident_r1() */
309 error = 0;
310 plog(LLV_ERROR, LOCATION, iph1->remote,
311 "reject the packet, "
312 "received unexpected payload type %s.\n",
313 s_isakmp_nptype(gen->np));
314 }
315 if (error < 0)
316 break;
317 }
318 end:
319 if (msg != NULL)
320 vfree(msg);
321 if (pbuf != NULL)
322 vfree(pbuf);
323 return error;
324 }
325
326 /*
327 * handling of Notification payload
328 */
329 static int
isakmp_info_recv_n(iph1,notify,msgid,encrypted)330 isakmp_info_recv_n(iph1, notify, msgid, encrypted)
331 struct ph1handle *iph1;
332 struct isakmp_pl_n *notify;
333 u_int32_t msgid;
334 int encrypted;
335 {
336 u_int type;
337 vchar_t *pbuf;
338 char *nraw, *ndata;
339 size_t l;
340 char *spi;
341
342 type = ntohs(notify->type);
343
344 switch (type) {
345 case ISAKMP_NTYPE_CONNECTED:
346 case ISAKMP_NTYPE_RESPONDER_LIFETIME:
347 case ISAKMP_NTYPE_REPLAY_STATUS:
348 #ifdef ENABLE_HYBRID
349 case ISAKMP_NTYPE_UNITY_HEARTBEAT:
350 #endif
351 /* do something */
352 break;
353 case ISAKMP_NTYPE_INITIAL_CONTACT:
354 if (encrypted)
355 info_recv_initialcontact(iph1);
356 return 0;
357 break;
358 #ifdef ENABLE_DPD
359 case ISAKMP_NTYPE_R_U_THERE:
360 if (encrypted)
361 return isakmp_info_recv_r_u(iph1,
362 (struct isakmp_pl_ru *)notify, msgid);
363 break;
364 case ISAKMP_NTYPE_R_U_THERE_ACK:
365 if (encrypted)
366 return isakmp_info_recv_r_u_ack(iph1,
367 (struct isakmp_pl_ru *)notify, msgid);
368 break;
369 #endif
370 default:
371 {
372 /* XXX there is a potential of dos attack. */
373 if(type >= ISAKMP_NTYPE_MINERROR &&
374 type <= ISAKMP_NTYPE_MAXERROR) {
375 if (msgid == 0) {
376 /* don't think this realy deletes ph1 ? */
377 plog(LLV_ERROR, LOCATION, iph1->remote,
378 "delete phase1 handle.\n");
379 return -1;
380 } else {
381 if (getph2bymsgid(iph1, msgid) == NULL) {
382 plog(LLV_ERROR, LOCATION, iph1->remote,
383 "fatal %s notify messsage, "
384 "phase1 should be deleted.\n",
385 s_isakmp_notify_msg(type));
386 } else {
387 plog(LLV_ERROR, LOCATION, iph1->remote,
388 "fatal %s notify messsage, "
389 "phase2 should be deleted.\n",
390 s_isakmp_notify_msg(type));
391 }
392 }
393 } else {
394 plog(LLV_ERROR, LOCATION, iph1->remote,
395 "unhandled notify message %s, "
396 "no phase2 handle found.\n",
397 s_isakmp_notify_msg(type));
398 }
399 }
400 break;
401 }
402
403 /* get spi if specified and allocate */
404 if(notify->spi_size > 0) {
405 if (ntohs(notify->h.len) < sizeof(*notify) + notify->spi_size) {
406 plog(LLV_ERROR, LOCATION, iph1->remote,
407 "invalid spi_size in notification payload.\n");
408 return -1;
409 }
410 spi = val2str((char *)(notify + 1), notify->spi_size);
411
412 plog(LLV_DEBUG, LOCATION, iph1->remote,
413 "notification message %d:%s, "
414 "doi=%d proto_id=%d spi=%s(size=%d).\n",
415 type, s_isakmp_notify_msg(type),
416 ntohl(notify->doi), notify->proto_id, spi, notify->spi_size);
417
418 racoon_free(spi);
419 }
420
421 /* Send the message data to the logs */
422 if(type >= ISAKMP_NTYPE_MINERROR &&
423 type <= ISAKMP_NTYPE_MAXERROR) {
424 l = ntohs(notify->h.len) - sizeof(*notify) - notify->spi_size;
425 if (l > 0) {
426 nraw = (char*)notify;
427 nraw += sizeof(*notify) + notify->spi_size;
428 ndata = binsanitize(nraw, l);
429 if (ndata != NULL) {
430 plog(LLV_ERROR, LOCATION, iph1->remote,
431 "Message: '%s'.\n",
432 ndata);
433 racoon_free(ndata);
434 } else {
435 plog(LLV_ERROR, LOCATION, iph1->remote,
436 "Cannot allocate memory\n");
437 }
438 }
439 }
440 return 0;
441 }
442
443 /*
444 * handling of Deletion payload
445 */
446 static int
isakmp_info_recv_d(iph1,delete,msgid,encrypted)447 isakmp_info_recv_d(iph1, delete, msgid, encrypted)
448 struct ph1handle *iph1;
449 struct isakmp_pl_d *delete;
450 u_int32_t msgid;
451 int encrypted;
452 {
453 int tlen, num_spi;
454 vchar_t *pbuf;
455 int protected = 0;
456 struct ph1handle *del_ph1;
457 struct ph2handle *iph2;
458 union {
459 u_int32_t spi32;
460 u_int16_t spi16[2];
461 } spi;
462
463 if (ntohl(delete->doi) != IPSEC_DOI) {
464 plog(LLV_ERROR, LOCATION, iph1->remote,
465 "delete payload with invalid doi:%d.\n",
466 ntohl(delete->doi));
467 #ifdef ENABLE_HYBRID
468 /*
469 * At deconnexion time, Cisco VPN client does this
470 * with a zero DOI. Don't give up in that situation.
471 */
472 if (((iph1->mode_cfg->flags &
473 ISAKMP_CFG_VENDORID_UNITY) == 0) || (delete->doi != 0))
474 return 0;
475 #else
476 return 0;
477 #endif
478 }
479
480 num_spi = ntohs(delete->num_spi);
481 tlen = ntohs(delete->h.len) - sizeof(struct isakmp_pl_d);
482
483 if (tlen != num_spi * delete->spi_size) {
484 plog(LLV_ERROR, LOCATION, iph1->remote,
485 "deletion payload with invalid length.\n");
486 return 0;
487 }
488
489 plog(LLV_DEBUG, LOCATION, iph1->remote,
490 "delete payload for protocol %s\n",
491 s_ipsecdoi_proto(delete->proto_id));
492
493 if(!iph1->rmconf->weak_phase1_check && !encrypted) {
494 plog(LLV_WARNING, LOCATION, iph1->remote,
495 "Ignoring unencrypted delete payload "
496 "(check the weak_phase1_check option)\n");
497 return 0;
498 }
499
500 switch (delete->proto_id) {
501 case IPSECDOI_PROTO_ISAKMP:
502 if (delete->spi_size != sizeof(isakmp_index)) {
503 plog(LLV_ERROR, LOCATION, iph1->remote,
504 "delete payload with strange spi "
505 "size %d(proto_id:%d)\n",
506 delete->spi_size, delete->proto_id);
507 return 0;
508 }
509
510 del_ph1=getph1byindex((isakmp_index *)(delete + 1));
511 if(del_ph1 != NULL){
512
513 EVT_PUSH(del_ph1->local, del_ph1->remote,
514 EVTT_PEERPH1_NOPROP, NULL);
515 if (del_ph1->scr)
516 SCHED_KILL(del_ph1->scr);
517
518 /*
519 * Do not delete IPsec SAs when receiving an IKE delete notification.
520 * Just delete the IKE SA.
521 */
522 isakmp_ph1expire(del_ph1);
523 }
524 break;
525
526 case IPSECDOI_PROTO_IPSEC_AH:
527 case IPSECDOI_PROTO_IPSEC_ESP:
528 if (delete->spi_size != sizeof(u_int32_t)) {
529 plog(LLV_ERROR, LOCATION, iph1->remote,
530 "delete payload with strange spi "
531 "size %d(proto_id:%d)\n",
532 delete->spi_size, delete->proto_id);
533 return 0;
534 }
535 EVT_PUSH(iph1->local, iph1->remote,
536 EVTT_PEER_DELETE, NULL);
537 purge_ipsec_spi(iph1->remote, delete->proto_id,
538 (u_int32_t *)(delete + 1), num_spi);
539 break;
540
541 case IPSECDOI_PROTO_IPCOMP:
542 /* need to handle both 16bit/32bit SPI */
543 memset(&spi, 0, sizeof(spi));
544 if (delete->spi_size == sizeof(spi.spi16[1])) {
545 memcpy(&spi.spi16[1], delete + 1,
546 sizeof(spi.spi16[1]));
547 } else if (delete->spi_size == sizeof(spi.spi32))
548 memcpy(&spi.spi32, delete + 1, sizeof(spi.spi32));
549 else {
550 plog(LLV_ERROR, LOCATION, iph1->remote,
551 "delete payload with strange spi "
552 "size %d(proto_id:%d)\n",
553 delete->spi_size, delete->proto_id);
554 return 0;
555 }
556 purge_ipsec_spi(iph1->remote, delete->proto_id,
557 &spi.spi32, num_spi);
558 break;
559
560 default:
561 plog(LLV_ERROR, LOCATION, iph1->remote,
562 "deletion message received, "
563 "invalid proto_id: %d\n",
564 delete->proto_id);
565 return 0;
566 }
567
568 plog(LLV_DEBUG, LOCATION, NULL, "purged SAs.\n");
569
570 return 0;
571 }
572
573 /*
574 * send Delete payload (for ISAKMP SA) in Informational exchange.
575 */
576 int
isakmp_info_send_d1(iph1)577 isakmp_info_send_d1(iph1)
578 struct ph1handle *iph1;
579 {
580 struct isakmp_pl_d *d;
581 vchar_t *payload = NULL;
582 int tlen;
583 int error = 0;
584
585 if (iph1->status != PHASE2ST_ESTABLISHED)
586 return 0;
587
588 /* create delete payload */
589
590 /* send SPIs of inbound SAs. */
591 /* XXX should send outbound SAs's ? */
592 tlen = sizeof(*d) + sizeof(isakmp_index);
593 payload = vmalloc(tlen);
594 if (payload == NULL) {
595 plog(LLV_ERROR, LOCATION, NULL,
596 "failed to get buffer for payload.\n");
597 return errno;
598 }
599
600 d = (struct isakmp_pl_d *)payload->v;
601 d->h.np = ISAKMP_NPTYPE_NONE;
602 d->h.len = htons(tlen);
603 d->doi = htonl(IPSEC_DOI);
604 d->proto_id = IPSECDOI_PROTO_ISAKMP;
605 d->spi_size = sizeof(isakmp_index);
606 d->num_spi = htons(1);
607 memcpy(d + 1, &iph1->index, sizeof(isakmp_index));
608
609 error = isakmp_info_send_common(iph1, payload,
610 ISAKMP_NPTYPE_D, 0);
611 vfree(payload);
612
613 return error;
614 }
615
616 /*
617 * send Delete payload (for IPsec SA) in Informational exchange, based on
618 * pfkey msg. It sends always single SPI.
619 */
620 int
isakmp_info_send_d2(iph2)621 isakmp_info_send_d2(iph2)
622 struct ph2handle *iph2;
623 {
624 struct ph1handle *iph1;
625 struct saproto *pr;
626 struct isakmp_pl_d *d;
627 vchar_t *payload = NULL;
628 int tlen;
629 int error = 0;
630 u_int8_t *spi;
631
632 if (iph2->status != PHASE2ST_ESTABLISHED)
633 return 0;
634
635 /*
636 * don't send delete information if there is no phase 1 handler.
637 * It's nonsensical to negotiate phase 1 to send the information.
638 */
639 iph1 = getph1byaddr(iph2->src, iph2->dst, 0);
640 if (iph1 == NULL){
641 plog(LLV_DEBUG2, LOCATION, NULL,
642 "No ph1 handler found, could not send DELETE_SA\n");
643 return 0;
644 }
645
646 /* create delete payload */
647 for (pr = iph2->approval->head; pr != NULL; pr = pr->next) {
648
649 /* send SPIs of inbound SAs. */
650 /*
651 * XXX should I send outbound SAs's ?
652 * I send inbound SAs's SPI only at the moment because I can't
653 * decode any more if peer send encoded packet without aware of
654 * deletion of SA. Outbound SAs don't come under the situation.
655 */
656 tlen = sizeof(*d) + pr->spisize;
657 payload = vmalloc(tlen);
658 if (payload == NULL) {
659 plog(LLV_ERROR, LOCATION, NULL,
660 "failed to get buffer for payload.\n");
661 return errno;
662 }
663
664 d = (struct isakmp_pl_d *)payload->v;
665 d->h.np = ISAKMP_NPTYPE_NONE;
666 d->h.len = htons(tlen);
667 d->doi = htonl(IPSEC_DOI);
668 d->proto_id = pr->proto_id;
669 d->spi_size = pr->spisize;
670 d->num_spi = htons(1);
671 /*
672 * XXX SPI bits are left-filled, for use with IPComp.
673 * we should be switching to variable-length spi field...
674 */
675 spi = (u_int8_t *)&pr->spi;
676 spi += sizeof(pr->spi);
677 spi -= pr->spisize;
678 memcpy(d + 1, spi, pr->spisize);
679
680 error = isakmp_info_send_common(iph1, payload,
681 ISAKMP_NPTYPE_D, 0);
682 vfree(payload);
683 }
684
685 return error;
686 }
687
688 /*
689 * send Notification payload (for without ISAKMP SA) in Informational exchange
690 */
691 int
isakmp_info_send_nx(isakmp,remote,local,type,data)692 isakmp_info_send_nx(isakmp, remote, local, type, data)
693 struct isakmp *isakmp;
694 struct sockaddr *remote, *local;
695 int type;
696 vchar_t *data;
697 {
698 struct ph1handle *iph1 = NULL;
699 struct remoteconf *rmconf;
700 vchar_t *payload = NULL;
701 int tlen;
702 int error = -1;
703 struct isakmp_pl_n *n;
704 int spisiz = 0; /* see below */
705
706 /* search appropreate configuration */
707 rmconf = getrmconf(remote);
708 if (rmconf == NULL) {
709 plog(LLV_ERROR, LOCATION, remote,
710 "no configuration found for peer address.\n");
711 goto end;
712 }
713
714 /* add new entry to isakmp status table. */
715 iph1 = newph1();
716 if (iph1 == NULL)
717 return -1;
718
719 memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(cookie_t));
720 isakmp_newcookie((char *)&iph1->index.r_ck, remote, local);
721 iph1->status = PHASE1ST_START;
722 iph1->rmconf = rmconf;
723 iph1->side = INITIATOR;
724 iph1->version = isakmp->v;
725 iph1->flags = 0;
726 iph1->msgid = 0; /* XXX */
727 #ifdef ENABLE_HYBRID
728 if ((iph1->mode_cfg = isakmp_cfg_mkstate()) == NULL)
729 goto end;
730 #endif
731 #ifdef ENABLE_FRAG
732 iph1->frag = 0;
733 iph1->frag_chain = NULL;
734 #endif
735
736 /* copy remote address */
737 if (copy_ph1addresses(iph1, rmconf, remote, local) < 0)
738 goto end;
739
740 tlen = sizeof(*n) + spisiz;
741 if (data)
742 tlen += data->l;
743 payload = vmalloc(tlen);
744 if (payload == NULL) {
745 plog(LLV_ERROR, LOCATION, NULL,
746 "failed to get buffer to send.\n");
747 goto end;
748 }
749
750 n = (struct isakmp_pl_n *)payload->v;
751 n->h.np = ISAKMP_NPTYPE_NONE;
752 n->h.len = htons(tlen);
753 n->doi = htonl(IPSEC_DOI);
754 n->proto_id = IPSECDOI_KEY_IKE;
755 n->spi_size = spisiz;
756 n->type = htons(type);
757 if (spisiz)
758 memset(n + 1, 0, spisiz); /* XXX spisiz is always 0 */
759 if (data)
760 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l);
761
762 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0);
763 vfree(payload);
764
765 end:
766 if (iph1 != NULL)
767 delph1(iph1);
768
769 return error;
770 }
771
772 /*
773 * send Notification payload (for ISAKMP SA) in Informational exchange
774 */
775 int
isakmp_info_send_n1(iph1,type,data)776 isakmp_info_send_n1(iph1, type, data)
777 struct ph1handle *iph1;
778 int type;
779 vchar_t *data;
780 {
781 vchar_t *payload = NULL;
782 int tlen;
783 int error = 0;
784 struct isakmp_pl_n *n;
785 int spisiz;
786
787 /*
788 * note on SPI size: which description is correct? I have chosen
789 * this to be 0.
790 *
791 * RFC2408 3.1, 2nd paragraph says: ISAKMP SA is identified by
792 * Initiator/Responder cookie and SPI has no meaning, SPI size = 0.
793 * RFC2408 3.1, first paragraph on page 40: ISAKMP SA is identified
794 * by cookie and SPI has no meaning, 0 <= SPI size <= 16.
795 * RFC2407 4.6.3.3, INITIAL-CONTACT is required to set to 16.
796 */
797 if (type == ISAKMP_NTYPE_INITIAL_CONTACT)
798 spisiz = sizeof(isakmp_index);
799 else
800 spisiz = 0;
801
802 tlen = sizeof(*n) + spisiz;
803 if (data)
804 tlen += data->l;
805 payload = vmalloc(tlen);
806 if (payload == NULL) {
807 plog(LLV_ERROR, LOCATION, NULL,
808 "failed to get buffer to send.\n");
809 return errno;
810 }
811
812 n = (struct isakmp_pl_n *)payload->v;
813 n->h.np = ISAKMP_NPTYPE_NONE;
814 n->h.len = htons(tlen);
815 n->doi = htonl(iph1->rmconf->doitype);
816 n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */
817 n->spi_size = spisiz;
818 n->type = htons(type);
819 if (spisiz)
820 memcpy(n + 1, &iph1->index, sizeof(isakmp_index));
821 if (data)
822 memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l);
823
824 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags);
825 vfree(payload);
826
827 return error;
828 }
829
830 /*
831 * send Notification payload (for IPsec SA) in Informational exchange
832 */
833 int
isakmp_info_send_n2(iph2,type,data)834 isakmp_info_send_n2(iph2, type, data)
835 struct ph2handle *iph2;
836 int type;
837 vchar_t *data;
838 {
839 struct ph1handle *iph1 = iph2->ph1;
840 vchar_t *payload = NULL;
841 int tlen;
842 int error = 0;
843 struct isakmp_pl_n *n;
844 struct saproto *pr;
845
846 if (!iph2->approval)
847 return EINVAL;
848
849 pr = iph2->approval->head;
850
851 /* XXX must be get proper spi */
852 tlen = sizeof(*n) + pr->spisize;
853 if (data)
854 tlen += data->l;
855 payload = vmalloc(tlen);
856 if (payload == NULL) {
857 plog(LLV_ERROR, LOCATION, NULL,
858 "failed to get buffer to send.\n");
859 return errno;
860 }
861
862 n = (struct isakmp_pl_n *)payload->v;
863 n->h.np = ISAKMP_NPTYPE_NONE;
864 n->h.len = htons(tlen);
865 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */
866 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/
867 n->spi_size = pr->spisize;
868 n->type = htons(type);
869 *(u_int32_t *)(n + 1) = pr->spi;
870 if (data)
871 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l);
872
873 iph2->flags |= ISAKMP_FLAG_E; /* XXX Should we do FLAG_A ? */
874 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph2->flags);
875 vfree(payload);
876
877 return error;
878 }
879
880 /*
881 * send Information
882 * When ph1->skeyid_a == NULL, send message without encoding.
883 */
884 int
isakmp_info_send_common(iph1,payload,np,flags)885 isakmp_info_send_common(iph1, payload, np, flags)
886 struct ph1handle *iph1;
887 vchar_t *payload;
888 u_int32_t np;
889 int flags;
890 {
891 struct ph2handle *iph2 = NULL;
892 vchar_t *hash = NULL;
893 struct isakmp *isakmp;
894 struct isakmp_gen *gen;
895 char *p;
896 int tlen;
897 int error = -1;
898
899 /* add new entry to isakmp status table */
900 iph2 = newph2();
901 if (iph2 == NULL)
902 goto end;
903
904 iph2->dst = dupsaddr(iph1->remote);
905 if (iph2->dst == NULL) {
906 delph2(iph2);
907 goto end;
908 }
909 iph2->src = dupsaddr(iph1->local);
910 if (iph2->src == NULL) {
911 delph2(iph2);
912 goto end;
913 }
914 #if (!defined(ENABLE_NATT)) || (defined(BROKEN_NATT))
915 if (set_port(iph2->dst, 0) == NULL ||
916 set_port(iph2->src, 0) == NULL) {
917 plog(LLV_ERROR, LOCATION, NULL,
918 "invalid family: %d\n", iph1->remote->sa_family);
919 delph2(iph2);
920 goto end;
921 }
922 #endif
923 iph2->ph1 = iph1;
924 iph2->side = INITIATOR;
925 iph2->status = PHASE2ST_START;
926 iph2->msgid = isakmp_newmsgid2(iph1);
927
928 /* get IV and HASH(1) if skeyid_a was generated. */
929 if (iph1->skeyid_a != NULL) {
930 iph2->ivm = oakley_newiv2(iph1, iph2->msgid);
931 if (iph2->ivm == NULL) {
932 delph2(iph2);
933 goto end;
934 }
935
936 /* generate HASH(1) */
937 hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, payload);
938 if (hash == NULL) {
939 delph2(iph2);
940 goto end;
941 }
942
943 /* initialized total buffer length */
944 tlen = hash->l;
945 tlen += sizeof(*gen);
946 } else {
947 /* IKE-SA is not established */
948 hash = NULL;
949
950 /* initialized total buffer length */
951 tlen = 0;
952 }
953 if ((flags & ISAKMP_FLAG_A) == 0)
954 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_E);
955 else
956 iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_A);
957
958 insph2(iph2);
959 bindph12(iph1, iph2);
960
961 tlen += sizeof(*isakmp) + payload->l;
962
963 /* create buffer for isakmp payload */
964 iph2->sendbuf = vmalloc(tlen);
965 if (iph2->sendbuf == NULL) {
966 plog(LLV_ERROR, LOCATION, NULL,
967 "failed to get buffer to send.\n");
968 goto err;
969 }
970
971 /* create isakmp header */
972 isakmp = (struct isakmp *)iph2->sendbuf->v;
973 memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t));
974 memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t));
975 isakmp->np = hash == NULL ? (np & 0xff) : ISAKMP_NPTYPE_HASH;
976 isakmp->v = iph1->version;
977 isakmp->etype = ISAKMP_ETYPE_INFO;
978 isakmp->flags = iph2->flags;
979 memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid));
980 isakmp->len = htonl(tlen);
981 p = (char *)(isakmp + 1);
982
983 /* create HASH payload */
984 if (hash != NULL) {
985 gen = (struct isakmp_gen *)p;
986 gen->np = np & 0xff;
987 gen->len = htons(sizeof(*gen) + hash->l);
988 p += sizeof(*gen);
989 memcpy(p, hash->v, hash->l);
990 p += hash->l;
991 }
992
993 /* add payload */
994 memcpy(p, payload->v, payload->l);
995 p += payload->l;
996
997 #ifdef HAVE_PRINT_ISAKMP_C
998 isakmp_printpacket(iph2->sendbuf, iph1->local, iph1->remote, 1);
999 #endif
1000
1001 /* encoding */
1002 if (ISSET(isakmp->flags, ISAKMP_FLAG_E)) {
1003 vchar_t *tmp;
1004
1005 tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive,
1006 iph2->ivm->iv);
1007 VPTRINIT(iph2->sendbuf);
1008 if (tmp == NULL)
1009 goto err;
1010 iph2->sendbuf = tmp;
1011 }
1012
1013 /* HDR*, HASH(1), N */
1014 if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) {
1015 VPTRINIT(iph2->sendbuf);
1016 goto err;
1017 }
1018
1019 plog(LLV_DEBUG, LOCATION, NULL,
1020 "sendto Information %s.\n", s_isakmp_nptype(np));
1021
1022 /*
1023 * don't resend notify message because peer can use Acknowledged
1024 * Informational if peer requires the reply of the notify message.
1025 */
1026
1027 /* XXX If Acknowledged Informational required, don't delete ph2handle */
1028 error = 0;
1029 VPTRINIT(iph2->sendbuf);
1030 goto err; /* XXX */
1031
1032 end:
1033 if (hash)
1034 vfree(hash);
1035 return error;
1036
1037 err:
1038 unbindph12(iph2);
1039 remph2(iph2);
1040 delph2(iph2);
1041 goto end;
1042 }
1043
1044 /*
1045 * add a notify payload to buffer by reallocating buffer.
1046 * If buf == NULL, the function only create a notify payload.
1047 *
1048 * XXX Which is SPI to be included, inbound or outbound ?
1049 */
1050 vchar_t *
isakmp_add_pl_n(buf0,np_p,type,pr,data)1051 isakmp_add_pl_n(buf0, np_p, type, pr, data)
1052 vchar_t *buf0;
1053 u_int8_t **np_p;
1054 int type;
1055 struct saproto *pr;
1056 vchar_t *data;
1057 {
1058 vchar_t *buf = NULL;
1059 struct isakmp_pl_n *n;
1060 int tlen;
1061 int oldlen = 0;
1062
1063 if (*np_p)
1064 **np_p = ISAKMP_NPTYPE_N;
1065
1066 tlen = sizeof(*n) + pr->spisize;
1067
1068 if (data)
1069 tlen += data->l;
1070 if (buf0) {
1071 oldlen = buf0->l;
1072 buf = vrealloc(buf0, buf0->l + tlen);
1073 } else
1074 buf = vmalloc(tlen);
1075 if (!buf) {
1076 plog(LLV_ERROR, LOCATION, NULL,
1077 "failed to get a payload buffer.\n");
1078 return NULL;
1079 }
1080
1081 n = (struct isakmp_pl_n *)(buf->v + oldlen);
1082 n->h.np = ISAKMP_NPTYPE_NONE;
1083 n->h.len = htons(tlen);
1084 n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */
1085 n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/
1086 n->spi_size = pr->spisize;
1087 n->type = htons(type);
1088 *(u_int32_t *)(n + 1) = pr->spi; /* XXX */
1089 if (data)
1090 memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l);
1091
1092 /* save the pointer of next payload type */
1093 *np_p = &n->h.np;
1094
1095 return buf;
1096 }
1097
1098 static void
purge_isakmp_spi(proto,spi,n)1099 purge_isakmp_spi(proto, spi, n)
1100 int proto;
1101 isakmp_index *spi; /*network byteorder*/
1102 size_t n;
1103 {
1104 struct ph1handle *iph1;
1105 size_t i;
1106
1107 for (i = 0; i < n; i++) {
1108 iph1 = getph1byindex(&spi[i]);
1109 if (!iph1)
1110 continue;
1111
1112 plog(LLV_INFO, LOCATION, NULL,
1113 "purged ISAKMP-SA proto_id=%s spi=%s.\n",
1114 s_ipsecdoi_proto(proto),
1115 isakmp_pindex(&spi[i], 0));
1116
1117 SCHED_KILL(iph1->sce);
1118 iph1->status = PHASE1ST_EXPIRED;
1119 iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1);
1120 }
1121 }
1122
1123
1124
1125 void
purge_ipsec_spi(dst0,proto,spi,n)1126 purge_ipsec_spi(dst0, proto, spi, n)
1127 struct sockaddr *dst0;
1128 int proto;
1129 u_int32_t *spi; /*network byteorder*/
1130 size_t n;
1131 {
1132 vchar_t *buf = NULL;
1133 struct sadb_msg *msg, *next, *end;
1134 struct sadb_sa *sa;
1135 struct sadb_lifetime *lt;
1136 struct sockaddr *src, *dst;
1137 struct ph2handle *iph2;
1138 u_int64_t created;
1139 size_t i;
1140 caddr_t mhp[SADB_EXT_MAX + 1];
1141 #ifdef ENABLE_NATT
1142 struct sadb_x_nat_t_type *natt_type;
1143 struct sadb_x_nat_t_port *natt_port;
1144 #endif
1145
1146 plog(LLV_DEBUG2, LOCATION, NULL,
1147 "purge_ipsec_spi:\n");
1148 plog(LLV_DEBUG2, LOCATION, NULL, "dst0: %s\n", saddr2str(dst0));
1149 plog(LLV_DEBUG2, LOCATION, NULL, "SPI: %08X\n", ntohl(spi[0]));
1150
1151 buf = pfkey_dump_sadb(ipsecdoi2pfkey_proto(proto));
1152 if (buf == NULL) {
1153 plog(LLV_DEBUG, LOCATION, NULL,
1154 "pfkey_dump_sadb returned nothing.\n");
1155 return;
1156 }
1157
1158 msg = (struct sadb_msg *)buf->v;
1159 end = (struct sadb_msg *)(buf->v + buf->l);
1160
1161 while (msg < end) {
1162 if ((msg->sadb_msg_len << 3) < sizeof(*msg))
1163 break;
1164 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3));
1165 if (msg->sadb_msg_type != SADB_DUMP) {
1166 msg = next;
1167 continue;
1168 }
1169
1170 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) {
1171 plog(LLV_ERROR, LOCATION, NULL,
1172 "pfkey_check (%s)\n", ipsec_strerror());
1173 msg = next;
1174 continue;
1175 }
1176
1177 sa = (struct sadb_sa *)(mhp[SADB_EXT_SA]);
1178 if (!sa
1179 || !mhp[SADB_EXT_ADDRESS_SRC]
1180 || !mhp[SADB_EXT_ADDRESS_DST]) {
1181 msg = next;
1182 continue;
1183 }
1184 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]);
1185 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]);
1186 lt = (struct sadb_lifetime*)mhp[SADB_EXT_LIFETIME_HARD];
1187 if(lt != NULL)
1188 created = lt->sadb_lifetime_addtime;
1189 else
1190 created = 0;
1191
1192 if (sa->sadb_sa_state != SADB_SASTATE_MATURE
1193 && sa->sadb_sa_state != SADB_SASTATE_DYING) {
1194 msg = next;
1195 continue;
1196 }
1197 #ifdef ENABLE_NATT
1198 natt_type = (void *)mhp[SADB_X_EXT_NAT_T_TYPE];
1199 if (natt_type && natt_type->sadb_x_nat_t_type_type) {
1200 /* NAT-T is enabled for this SADB entry; copy
1201 * the ports from NAT-T extensions */
1202 natt_port = (void *)mhp[SADB_X_EXT_NAT_T_SPORT];
1203 if (extract_port(src) == 0 && natt_port != NULL)
1204 set_port(src, ntohs(natt_port->sadb_x_nat_t_port_port));
1205
1206 natt_port = (void *)mhp[SADB_X_EXT_NAT_T_DPORT];
1207 if (extract_port(dst) == 0 && natt_port != NULL)
1208 set_port(dst, ntohs(natt_port->sadb_x_nat_t_port_port));
1209 }else{
1210 /* Force default UDP ports, so CMPSADDR will match SAs with NO encapsulation
1211 */
1212 set_port(src, PORT_ISAKMP);
1213 set_port(dst, PORT_ISAKMP);
1214 }
1215 #endif
1216 plog(LLV_DEBUG2, LOCATION, NULL, "src: %s\n", saddr2str(src));
1217 plog(LLV_DEBUG2, LOCATION, NULL, "dst: %s\n", saddr2str(dst));
1218
1219 /* XXX n^2 algorithm, inefficient */
1220
1221 /* don't delete inbound SAs at the moment */
1222 /* XXX should we remove SAs with opposite direction as well? */
1223 if (CMPSADDR(dst0, dst)) {
1224 msg = next;
1225 continue;
1226 }
1227
1228 #ifdef ENABLE_NATT
1229 if (natt_type == NULL ||
1230 ! natt_type->sadb_x_nat_t_type_type) {
1231 /* Set back port to 0 if it was forced to default UDP port
1232 */
1233 set_port(src, 0);
1234 set_port(dst, 0);
1235 }
1236 #endif
1237 for (i = 0; i < n; i++) {
1238 plog(LLV_DEBUG, LOCATION, NULL,
1239 "check spi(packet)=%u spi(db)=%u.\n",
1240 ntohl(spi[i]), ntohl(sa->sadb_sa_spi));
1241 if (spi[i] != sa->sadb_sa_spi)
1242 continue;
1243
1244 pfkey_send_delete(lcconf->sock_pfkey,
1245 msg->sadb_msg_satype,
1246 IPSEC_MODE_ANY,
1247 src, dst, sa->sadb_sa_spi);
1248
1249 /*
1250 * delete a relative phase 2 handler.
1251 * continue to process if no relative phase 2 handler
1252 * exists.
1253 */
1254 iph2 = getph2bysaidx(src, dst, proto, spi[i]);
1255 if(iph2 != NULL){
1256 delete_spd(iph2, created);
1257 unbindph12(iph2);
1258 remph2(iph2);
1259 delph2(iph2);
1260 }
1261
1262 plog(LLV_INFO, LOCATION, NULL,
1263 "purged IPsec-SA proto_id=%s spi=%u.\n",
1264 s_ipsecdoi_proto(proto),
1265 ntohl(spi[i]));
1266 }
1267
1268 msg = next;
1269 }
1270
1271 if (buf)
1272 vfree(buf);
1273 }
1274
1275 /*
1276 * delete all phase2 sa relatived to the destination address.
1277 * Don't delete Phase 1 handlers on INITIAL-CONTACT, and don't ignore
1278 * an INITIAL-CONTACT if we have contacted the peer. This matches the
1279 * Sun IKE behavior, and makes rekeying work much better when the peer
1280 * restarts.
1281 */
1282 static void
info_recv_initialcontact(iph1)1283 info_recv_initialcontact(iph1)
1284 struct ph1handle *iph1;
1285 {
1286 vchar_t *buf = NULL;
1287 struct sadb_msg *msg, *next, *end;
1288 struct sadb_sa *sa;
1289 struct sockaddr *src, *dst;
1290 caddr_t mhp[SADB_EXT_MAX + 1];
1291 int proto_id, i;
1292 struct ph2handle *iph2;
1293 #if 0
1294 char *loc, *rem;
1295 #endif
1296
1297 if (f_local)
1298 return;
1299
1300 #if 0
1301 loc = racoon_strdup(saddrwop2str(iph1->local));
1302 rem = racoon_strdup(saddrwop2str(iph1->remote));
1303 STRDUP_FATAL(loc);
1304 STRDUP_FATAL(rem);
1305
1306 /*
1307 * Purge all IPSEC-SAs for the peer. We can do this
1308 * the easy way (using a PF_KEY SADB_DELETE extension)
1309 * or we can do it the hard way.
1310 */
1311 for (i = 0; i < pfkey_nsatypes; i++) {
1312 proto_id = pfkey2ipsecdoi_proto(pfkey_satypes[i].ps_satype);
1313
1314 plog(LLV_INFO, LOCATION, NULL,
1315 "purging %s SAs for %s -> %s\n",
1316 pfkey_satypes[i].ps_name, loc, rem);
1317 if (pfkey_send_delete_all(lcconf->sock_pfkey,
1318 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY,
1319 iph1->local, iph1->remote) == -1) {
1320 plog(LLV_ERROR, LOCATION, NULL,
1321 "delete_all %s -> %s failed for %s (%s)\n",
1322 loc, rem,
1323 pfkey_satypes[i].ps_name, ipsec_strerror());
1324 goto the_hard_way;
1325 }
1326
1327 deleteallph2(iph1->local, iph1->remote, proto_id);
1328
1329 plog(LLV_INFO, LOCATION, NULL,
1330 "purging %s SAs for %s -> %s\n",
1331 pfkey_satypes[i].ps_name, rem, loc);
1332 if (pfkey_send_delete_all(lcconf->sock_pfkey,
1333 pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY,
1334 iph1->remote, iph1->local) == -1) {
1335 plog(LLV_ERROR, LOCATION, NULL,
1336 "delete_all %s -> %s failed for %s (%s)\n",
1337 rem, loc,
1338 pfkey_satypes[i].ps_name, ipsec_strerror());
1339 goto the_hard_way;
1340 }
1341
1342 deleteallph2(iph1->remote, iph1->local, proto_id);
1343 }
1344
1345 racoon_free(loc);
1346 racoon_free(rem);
1347 return;
1348
1349 the_hard_way:
1350 racoon_free(loc);
1351 racoon_free(rem);
1352 #endif
1353
1354 buf = pfkey_dump_sadb(SADB_SATYPE_UNSPEC);
1355 if (buf == NULL) {
1356 plog(LLV_DEBUG, LOCATION, NULL,
1357 "pfkey_dump_sadb returned nothing.\n");
1358 return;
1359 }
1360
1361 msg = (struct sadb_msg *)buf->v;
1362 end = (struct sadb_msg *)(buf->v + buf->l);
1363
1364 while (msg < end) {
1365 if ((msg->sadb_msg_len << 3) < sizeof(*msg))
1366 break;
1367 next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3));
1368 if (msg->sadb_msg_type != SADB_DUMP) {
1369 msg = next;
1370 continue;
1371 }
1372
1373 if (pfkey_align(msg, mhp) || pfkey_check(mhp)) {
1374 plog(LLV_ERROR, LOCATION, NULL,
1375 "pfkey_check (%s)\n", ipsec_strerror());
1376 msg = next;
1377 continue;
1378 }
1379
1380 if (mhp[SADB_EXT_SA] == NULL
1381 || mhp[SADB_EXT_ADDRESS_SRC] == NULL
1382 || mhp[SADB_EXT_ADDRESS_DST] == NULL) {
1383 msg = next;
1384 continue;
1385 }
1386 sa = (struct sadb_sa *)mhp[SADB_EXT_SA];
1387 src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]);
1388 dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]);
1389
1390 if (sa->sadb_sa_state != SADB_SASTATE_MATURE
1391 && sa->sadb_sa_state != SADB_SASTATE_DYING) {
1392 msg = next;
1393 continue;
1394 }
1395
1396 /*
1397 * RFC2407 4.6.3.3 INITIAL-CONTACT is the message that
1398 * announces the sender of the message was rebooted.
1399 * it is interpreted to delete all SAs which source address
1400 * is the sender of the message.
1401 * racoon only deletes SA which is matched both the
1402 * source address and the destination accress.
1403 */
1404 #ifdef ENABLE_NATT
1405 /*
1406 * XXX RFC 3947 says that whe MUST NOT use IP+port to find old SAs
1407 * from this peer !
1408 */
1409 if(iph1->natt_flags & NAT_DETECTED){
1410 if (CMPSADDR(iph1->local, src) == 0 &&
1411 CMPSADDR(iph1->remote, dst) == 0)
1412 ;
1413 else if (CMPSADDR(iph1->remote, src) == 0 &&
1414 CMPSADDR(iph1->local, dst) == 0)
1415 ;
1416 else {
1417 msg = next;
1418 continue;
1419 }
1420 } else
1421 #endif
1422 /* If there is no NAT-T, we don't have to check addr + port...
1423 * XXX what about a configuration with a remote peers which is not
1424 * NATed, but which NATs some other peers ?
1425 * Here, the INITIAl-CONTACT would also flush all those NATed peers !!
1426 */
1427 if (cmpsaddrwop(iph1->local, src) == 0 &&
1428 cmpsaddrwop(iph1->remote, dst) == 0)
1429 ;
1430 else if (cmpsaddrwop(iph1->remote, src) == 0 &&
1431 cmpsaddrwop(iph1->local, dst) == 0)
1432 ;
1433 else {
1434 msg = next;
1435 continue;
1436 }
1437
1438 /*
1439 * Make sure this is an SATYPE that we manage.
1440 * This is gross; too bad we couldn't do it the
1441 * easy way.
1442 */
1443 for (i = 0; i < pfkey_nsatypes; i++) {
1444 if (pfkey_satypes[i].ps_satype ==
1445 msg->sadb_msg_satype)
1446 break;
1447 }
1448 if (i == pfkey_nsatypes) {
1449 msg = next;
1450 continue;
1451 }
1452
1453 plog(LLV_INFO, LOCATION, NULL,
1454 "purging spi=%u.\n", ntohl(sa->sadb_sa_spi));
1455 pfkey_send_delete(lcconf->sock_pfkey,
1456 msg->sadb_msg_satype,
1457 IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi);
1458
1459 /*
1460 * delete a relative phase 2 handler.
1461 * continue to process if no relative phase 2 handler
1462 * exists.
1463 */
1464 proto_id = pfkey2ipsecdoi_proto(msg->sadb_msg_satype);
1465 iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);
1466 if (iph2) {
1467 delete_spd(iph2, 0);
1468 unbindph12(iph2);
1469 remph2(iph2);
1470 delph2(iph2);
1471 }
1472
1473 msg = next;
1474 }
1475
1476 vfree(buf);
1477 }
1478
1479 void
isakmp_check_notify(gen,iph1)1480 isakmp_check_notify(gen, iph1)
1481 struct isakmp_gen *gen; /* points to Notify payload */
1482 struct ph1handle *iph1;
1483 {
1484 struct isakmp_pl_n *notify = (struct isakmp_pl_n *)gen;
1485
1486 plog(LLV_DEBUG, LOCATION, iph1->remote,
1487 "Notify Message received\n");
1488
1489 switch (ntohs(notify->type)) {
1490 case ISAKMP_NTYPE_CONNECTED:
1491 case ISAKMP_NTYPE_RESPONDER_LIFETIME:
1492 case ISAKMP_NTYPE_REPLAY_STATUS:
1493 case ISAKMP_NTYPE_HEARTBEAT:
1494 #ifdef ENABLE_HYBRID
1495 case ISAKMP_NTYPE_UNITY_HEARTBEAT:
1496 #endif
1497 plog(LLV_WARNING, LOCATION, iph1->remote,
1498 "ignore %s notification.\n",
1499 s_isakmp_notify_msg(ntohs(notify->type)));
1500 break;
1501 case ISAKMP_NTYPE_INITIAL_CONTACT:
1502 plog(LLV_WARNING, LOCATION, iph1->remote,
1503 "ignore INITIAL-CONTACT notification, "
1504 "because it is only accepted after phase1.\n");
1505 break;
1506 default:
1507 isakmp_info_send_n1(iph1, ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE, NULL);
1508 plog(LLV_ERROR, LOCATION, iph1->remote,
1509 "received unknown notification type %s.\n",
1510 s_isakmp_notify_msg(ntohs(notify->type)));
1511 }
1512
1513 return;
1514 }
1515
1516
1517 #ifdef ENABLE_DPD
1518 static int
isakmp_info_recv_r_u(iph1,ru,msgid)1519 isakmp_info_recv_r_u (iph1, ru, msgid)
1520 struct ph1handle *iph1;
1521 struct isakmp_pl_ru *ru;
1522 u_int32_t msgid;
1523 {
1524 struct isakmp_pl_ru *ru_ack;
1525 vchar_t *payload = NULL;
1526 int tlen;
1527 int error = 0;
1528
1529 plog(LLV_DEBUG, LOCATION, iph1->remote,
1530 "DPD R-U-There received\n");
1531
1532 /* XXX should compare cookies with iph1->index?
1533 Or is this already done by calling function? */
1534 tlen = sizeof(*ru_ack);
1535 payload = vmalloc(tlen);
1536 if (payload == NULL) {
1537 plog(LLV_ERROR, LOCATION, NULL,
1538 "failed to get buffer to send.\n");
1539 return errno;
1540 }
1541
1542 ru_ack = (struct isakmp_pl_ru *)payload->v;
1543 ru_ack->h.np = ISAKMP_NPTYPE_NONE;
1544 ru_ack->h.len = htons(tlen);
1545 ru_ack->doi = htonl(IPSEC_DOI);
1546 ru_ack->type = htons(ISAKMP_NTYPE_R_U_THERE_ACK);
1547 ru_ack->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ? */
1548 ru_ack->spi_size = sizeof(isakmp_index);
1549 memcpy(ru_ack->i_ck, ru->i_ck, sizeof(cookie_t));
1550 memcpy(ru_ack->r_ck, ru->r_ck, sizeof(cookie_t));
1551 ru_ack->data = ru->data;
1552
1553 /* XXX Should we do FLAG_A ? */
1554 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N,
1555 ISAKMP_FLAG_E);
1556 vfree(payload);
1557
1558 plog(LLV_DEBUG, LOCATION, NULL, "received a valid R-U-THERE, ACK sent\n");
1559
1560 /* Should we mark tunnel as active ? */
1561 return error;
1562 }
1563
1564 static int
isakmp_info_recv_r_u_ack(iph1,ru,msgid)1565 isakmp_info_recv_r_u_ack (iph1, ru, msgid)
1566 struct ph1handle *iph1;
1567 struct isakmp_pl_ru *ru;
1568 u_int32_t msgid;
1569 {
1570
1571 plog(LLV_DEBUG, LOCATION, iph1->remote,
1572 "DPD R-U-There-Ack received\n");
1573
1574 /* XXX Maintain window of acceptable sequence numbers ?
1575 * => ru->data <= iph2->dpd_seq &&
1576 * ru->data >= iph2->dpd_seq - iph2->dpd_fails ? */
1577 if (ntohl(ru->data) != iph1->dpd_seq-1) {
1578 plog(LLV_ERROR, LOCATION, iph1->remote,
1579 "Wrong DPD sequence number (%d, %d expected).\n",
1580 ntohl(ru->data), iph1->dpd_seq-1);
1581 return 0;
1582 }
1583
1584 if (memcmp(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)) ||
1585 memcmp(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t))) {
1586 plog(LLV_ERROR, LOCATION, iph1->remote,
1587 "Cookie mismatch in DPD ACK!.\n");
1588 return 0;
1589 }
1590
1591 iph1->dpd_fails = 0;
1592
1593 /* Useless ??? */
1594 iph1->dpd_lastack = time(NULL);
1595
1596 SCHED_KILL(iph1->dpd_r_u);
1597
1598 isakmp_sched_r_u(iph1, 0);
1599
1600 plog(LLV_DEBUG, LOCATION, NULL, "received an R-U-THERE-ACK\n");
1601
1602 return 0;
1603 }
1604
1605
1606
1607
1608 /*
1609 * send DPD R-U-THERE payload in Informational exchange.
1610 */
1611 static void
isakmp_info_send_r_u(arg)1612 isakmp_info_send_r_u(arg)
1613 void *arg;
1614 {
1615 struct ph1handle *iph1 = arg;
1616
1617 /* create R-U-THERE payload */
1618 struct isakmp_pl_ru *ru;
1619 vchar_t *payload = NULL;
1620 int tlen;
1621 int error = 0;
1622
1623 plog(LLV_DEBUG, LOCATION, iph1->remote, "DPD monitoring....\n");
1624
1625 iph1->dpd_r_u=NULL;
1626
1627 if (iph1->dpd_fails >= iph1->rmconf->dpd_maxfails) {
1628
1629 plog(LLV_INFO, LOCATION, iph1->remote,
1630 "DPD: remote (ISAKMP-SA spi=%s) seems to be dead.\n",
1631 isakmp_pindex(&iph1->index, 0));
1632
1633 EVT_PUSH(iph1->local, iph1->remote, EVTT_DPD_TIMEOUT, NULL);
1634 purge_remote(iph1);
1635
1636 /* Do not reschedule here: phase1 is deleted,
1637 * DPD will be reactivated when a new ph1 will be negociated
1638 */
1639 return;
1640 }
1641
1642 /* TODO: check recent activity to avoid useless sends... */
1643
1644 tlen = sizeof(*ru);
1645 payload = vmalloc(tlen);
1646 if (payload == NULL) {
1647 plog(LLV_ERROR, LOCATION, NULL,
1648 "failed to get buffer for payload.\n");
1649 return;
1650 }
1651 ru = (struct isakmp_pl_ru *)payload->v;
1652 ru->h.np = ISAKMP_NPTYPE_NONE;
1653 ru->h.len = htons(tlen);
1654 ru->doi = htonl(IPSEC_DOI);
1655 ru->type = htons(ISAKMP_NTYPE_R_U_THERE);
1656 ru->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ?*/
1657 ru->spi_size = sizeof(isakmp_index);
1658
1659 memcpy(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t));
1660 memcpy(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t));
1661
1662 if (iph1->dpd_seq == 0){
1663 /* generate a random seq which is not too big */
1664 srand(time(NULL));
1665 iph1->dpd_seq = rand() & 0x0fff;
1666 }
1667
1668 ru->data = htonl(iph1->dpd_seq);
1669
1670 error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0);
1671 vfree(payload);
1672
1673 plog(LLV_DEBUG, LOCATION, iph1->remote,
1674 "DPD R-U-There sent (%d)\n", error);
1675
1676 /* will be decreased if ACK received... */
1677 iph1->dpd_fails++;
1678
1679 /* XXX should be increased only when ACKed ? */
1680 iph1->dpd_seq++;
1681
1682 /* Reschedule the r_u_there with a short delay,
1683 * will be deleted/rescheduled if ACK received before */
1684 isakmp_sched_r_u(iph1, 1);
1685
1686 plog(LLV_DEBUG, LOCATION, iph1->remote,
1687 "rescheduling send_r_u (%d).\n", iph1->rmconf->dpd_retry);
1688 }
1689
1690 /* Schedule a new R-U-THERE */
1691 int
isakmp_sched_r_u(iph1,retry)1692 isakmp_sched_r_u(iph1, retry)
1693 struct ph1handle *iph1;
1694 int retry;
1695 {
1696 if(iph1 == NULL ||
1697 iph1->rmconf == NULL)
1698 return 1;
1699
1700
1701 if(iph1->dpd_support == 0 ||
1702 iph1->rmconf->dpd_interval == 0)
1703 return 0;
1704
1705 if(retry)
1706 iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_retry,
1707 isakmp_info_send_r_u, iph1);
1708 else
1709 iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_interval,
1710 isakmp_info_send_r_u, iph1);
1711
1712 return 0;
1713 }
1714 #endif
1715