Change traffic selectors during Quick Mode in case of a NAT in transport mode
[strongswan.git] / src / libcharon / sa / ikev1 / tasks / quick_mode.c
1 /*
2 * Copyright (C) 2012 Tobias Brunner
3 * Hochschule fuer Technik Rapperswil
4 *
5 * Copyright (C) 2011 Martin Willi
6 * Copyright (C) 2011 revosec AG
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 */
18
19 #include "quick_mode.h"
20
21 #include <string.h>
22
23 #include <daemon.h>
24 #include <sa/ikev1/keymat_v1.h>
25 #include <encoding/payloads/sa_payload.h>
26 #include <encoding/payloads/nonce_payload.h>
27 #include <encoding/payloads/ke_payload.h>
28 #include <encoding/payloads/id_payload.h>
29 #include <encoding/payloads/payload.h>
30 #include <sa/ikev1/tasks/informational.h>
31 #include <sa/ikev1/tasks/quick_delete.h>
32 #include <processing/jobs/inactivity_job.h>
33
34 typedef struct private_quick_mode_t private_quick_mode_t;
35
36 /**
37 * Private members of a quick_mode_t task.
38 */
39 struct private_quick_mode_t {
40
41 /**
42 * Public methods and task_t interface.
43 */
44 quick_mode_t public;
45
46 /**
47 * Assigned IKE_SA.
48 */
49 ike_sa_t *ike_sa;
50
51 /**
52 * TRUE if we are initiating quick mode
53 */
54 bool initiator;
55
56 /**
57 * Traffic selector of initiator
58 */
59 traffic_selector_t *tsi;
60
61 /**
62 * Traffic selector of responder
63 */
64 traffic_selector_t *tsr;
65
66 /**
67 * Initiators nonce
68 */
69 chunk_t nonce_i;
70
71 /**
72 * Responder nonce
73 */
74 chunk_t nonce_r;
75
76 /**
77 * Initiators ESP SPI
78 */
79 u_int32_t spi_i;
80
81 /**
82 * Responder ESP SPI
83 */
84 u_int32_t spi_r;
85
86 /**
87 * Initiators IPComp CPI
88 */
89 u_int16_t cpi_i;
90
91 /**
92 * Responders IPComp CPI
93 */
94 u_int16_t cpi_r;
95
96 /**
97 * selected CHILD_SA proposal
98 */
99 proposal_t *proposal;
100
101 /**
102 * Config of CHILD_SA to establish
103 */
104 child_cfg_t *config;
105
106 /**
107 * CHILD_SA we are about to establish
108 */
109 child_sa_t *child_sa;
110
111 /**
112 * IKEv1 keymat
113 */
114 keymat_v1_t *keymat;
115
116 /**
117 * DH exchange, when PFS is in use
118 */
119 diffie_hellman_t *dh;
120
121 /**
122 * Negotiated lifetime of new SA
123 */
124 u_int32_t lifetime;
125
126 /**
127 * Negotaited lifebytes of new SA
128 */
129 u_int64_t lifebytes;
130
131 /**
132 * Reqid to use, 0 for auto-allocate
133 */
134 u_int32_t reqid;
135
136 /**
137 * SPI of SA we rekey
138 */
139 u_int32_t rekey;
140
141 /**
142 * Negotiated mode, tunnel or transport
143 */
144 ipsec_mode_t mode;
145
146 /**
147 * Use UDP encapsulation
148 */
149 bool udp;
150
151 /** states of quick mode */
152 enum {
153 QM_INIT,
154 QM_NEGOTIATED,
155 } state;
156 };
157
158 /**
159 * Schedule inactivity timeout for CHILD_SA with reqid, if enabled
160 */
161 static void schedule_inactivity_timeout(private_quick_mode_t *this)
162 {
163 u_int32_t timeout;
164 bool close_ike;
165
166 timeout = this->config->get_inactivity(this->config);
167 if (timeout)
168 {
169 close_ike = lib->settings->get_bool(lib->settings,
170 "%s.inactivity_close_ike", FALSE, charon->name);
171 lib->scheduler->schedule_job(lib->scheduler, (job_t*)
172 inactivity_job_create(this->child_sa->get_reqid(this->child_sa),
173 timeout, close_ike), timeout);
174 }
175 }
176
177 /**
178 * Check if we have a an address pool configured
179 */
180 static bool have_pool(ike_sa_t *ike_sa)
181 {
182 enumerator_t *enumerator;
183 peer_cfg_t *peer_cfg;
184 char *pool;
185 bool found = FALSE;
186
187 peer_cfg = ike_sa->get_peer_cfg(ike_sa);
188 if (peer_cfg)
189 {
190 enumerator = peer_cfg->create_pool_enumerator(peer_cfg);
191 if (enumerator->enumerate(enumerator, &pool))
192 {
193 found = TRUE;
194 }
195 enumerator->destroy(enumerator);
196 }
197 return found;
198 }
199
200 /**
201 * Get host to use for dynamic traffic selectors
202 */
203 static host_t *get_dynamic_host(ike_sa_t *ike_sa, bool local)
204 {
205 enumerator_t *enumerator;
206 host_t *host;
207
208 enumerator = ike_sa->create_virtual_ip_enumerator(ike_sa, local);
209 if (!enumerator->enumerate(enumerator, &host))
210 {
211 if (local)
212 {
213 host = ike_sa->get_my_host(ike_sa);
214 }
215 else
216 {
217 if (have_pool(ike_sa))
218 {
219 /* we have an IP address pool, but didn't negotiate a
220 * virtual IP. */
221 host = NULL;
222 }
223 else
224 {
225 host = ike_sa->get_other_host(ike_sa);
226 }
227 }
228 }
229 enumerator->destroy(enumerator);
230 return host;
231 }
232
233 /**
234 * Install negotiated CHILD_SA
235 */
236 static bool install(private_quick_mode_t *this)
237 {
238 status_t status, status_i, status_o;
239 chunk_t encr_i, encr_r, integ_i, integ_r;
240 linked_list_t *tsi, *tsr;
241 child_sa_t *old = NULL;
242
243 this->child_sa->set_proposal(this->child_sa, this->proposal);
244 this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
245 this->child_sa->set_mode(this->child_sa, this->mode);
246
247 if (this->cpi_i && this->cpi_r)
248 { /* DEFLATE is the only transform we currently support */
249 this->child_sa->set_ipcomp(this->child_sa, IPCOMP_DEFLATE);
250 }
251 else
252 {
253 this->cpi_i = this->cpi_r = 0;
254 }
255
256 this->child_sa->set_protocol(this->child_sa,
257 this->proposal->get_protocol(this->proposal));
258
259 status_i = status_o = FAILED;
260 encr_i = encr_r = integ_i = integ_r = chunk_empty;
261 tsi = linked_list_create();
262 tsr = linked_list_create();
263 tsi->insert_last(tsi, this->tsi->clone(this->tsi));
264 tsr->insert_last(tsr, this->tsr->clone(this->tsr));
265 if (this->initiator)
266 {
267 charon->bus->narrow(charon->bus, this->child_sa,
268 NARROW_INITIATOR_POST_AUTH, tsi, tsr);
269 }
270 else
271 {
272 charon->bus->narrow(charon->bus, this->child_sa,
273 NARROW_RESPONDER_POST, tsr, tsi);
274 }
275 if (tsi->get_count(tsi) == 0 || tsr->get_count(tsr) == 0)
276 {
277 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
278 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
279 DBG1(DBG_IKE, "no acceptable traffic selectors found");
280 return FALSE;
281 }
282
283 if (this->keymat->derive_child_keys(this->keymat, this->proposal, this->dh,
284 this->spi_i, this->spi_r, this->nonce_i, this->nonce_r,
285 &encr_i, &integ_i, &encr_r, &integ_r))
286 {
287 if (this->initiator)
288 {
289 status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
290 this->spi_i, this->cpi_i, TRUE, FALSE, tsi, tsr);
291 status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
292 this->spi_r, this->cpi_r, FALSE, FALSE, tsi, tsr);
293 }
294 else
295 {
296 status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
297 this->spi_r, this->cpi_r, TRUE, FALSE, tsr, tsi);
298 status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
299 this->spi_i, this->cpi_i, FALSE, FALSE, tsr, tsi);
300 }
301 }
302 chunk_clear(&integ_i);
303 chunk_clear(&integ_r);
304 chunk_clear(&encr_i);
305 chunk_clear(&encr_r);
306
307 if (status_i != SUCCESS || status_o != SUCCESS)
308 {
309 DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
310 (status_i != SUCCESS) ? "inbound " : "",
311 (status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
312 (status_o != SUCCESS) ? "outbound " : "");
313 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
314 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
315 return FALSE;
316 }
317
318 if (this->initiator)
319 {
320 status = this->child_sa->add_policies(this->child_sa, tsi, tsr);
321 }
322 else
323 {
324 status = this->child_sa->add_policies(this->child_sa, tsr, tsi);
325 }
326 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
327 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
328 if (status != SUCCESS)
329 {
330 DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
331 return FALSE;
332 }
333
334 charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
335 this->dh, this->nonce_i, this->nonce_r);
336
337 /* add to IKE_SA, and remove from task */
338 this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
339 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
340
341 DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
342 "with SPIs %.8x_i %.8x_o and TS %#R=== %#R",
343 this->child_sa->get_name(this->child_sa),
344 this->child_sa->get_reqid(this->child_sa),
345 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
346 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
347 this->child_sa->get_traffic_selectors(this->child_sa, TRUE),
348 this->child_sa->get_traffic_selectors(this->child_sa, FALSE));
349
350 if (this->rekey)
351 {
352 old = this->ike_sa->get_child_sa(this->ike_sa,
353 this->proposal->get_protocol(this->proposal),
354 this->rekey, TRUE);
355 }
356 if (old)
357 {
358 charon->bus->child_rekey(charon->bus, old, this->child_sa);
359 }
360 else
361 {
362 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
363 }
364 if (!this->rekey)
365 {
366 schedule_inactivity_timeout(this);
367 }
368 this->child_sa = NULL;
369 return TRUE;
370 }
371
372 /**
373 * Generate and add NONCE
374 */
375 static bool add_nonce(private_quick_mode_t *this, chunk_t *nonce,
376 message_t *message)
377 {
378 nonce_payload_t *nonce_payload;
379 nonce_gen_t *nonceg;
380
381 nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
382 if (!nonceg)
383 {
384 DBG1(DBG_IKE, "no nonce generator found to create nonce");
385 return FALSE;
386 }
387 if (!nonceg->allocate_nonce(nonceg, NONCE_SIZE, nonce))
388 {
389 DBG1(DBG_IKE, "nonce allocation failed");
390 nonceg->destroy(nonceg);
391 return FALSE;
392 }
393 nonceg->destroy(nonceg);
394
395 nonce_payload = nonce_payload_create(NONCE_V1);
396 nonce_payload->set_nonce(nonce_payload, *nonce);
397 message->add_payload(message, &nonce_payload->payload_interface);
398
399 return TRUE;
400 }
401
402 /**
403 * Extract nonce from NONCE payload
404 */
405 static bool get_nonce(private_quick_mode_t *this, chunk_t *nonce,
406 message_t *message)
407 {
408 nonce_payload_t *nonce_payload;
409
410 nonce_payload = (nonce_payload_t*)message->get_payload(message, NONCE_V1);
411 if (!nonce_payload)
412 {
413 DBG1(DBG_IKE, "NONCE payload missing in message");
414 return FALSE;
415 }
416 *nonce = nonce_payload->get_nonce(nonce_payload);
417
418 return TRUE;
419 }
420
421 /**
422 * Add KE payload to message
423 */
424 static void add_ke(private_quick_mode_t *this, message_t *message)
425 {
426 ke_payload_t *ke_payload;
427
428 ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1, this->dh);
429 message->add_payload(message, &ke_payload->payload_interface);
430 }
431
432 /**
433 * Get DH value from a KE payload
434 */
435 static bool get_ke(private_quick_mode_t *this, message_t *message)
436 {
437 ke_payload_t *ke_payload;
438
439 ke_payload = (ke_payload_t*)message->get_payload(message, KEY_EXCHANGE_V1);
440 if (!ke_payload)
441 {
442 DBG1(DBG_IKE, "KE payload missing");
443 return FALSE;
444 }
445 this->dh->set_other_public_value(this->dh,
446 ke_payload->get_key_exchange_data(ke_payload));
447 return TRUE;
448 }
449
450 /**
451 * Select a traffic selector from configuration
452 */
453 static traffic_selector_t* select_ts(private_quick_mode_t *this, bool local,
454 linked_list_t *supplied)
455 {
456 traffic_selector_t *ts;
457 linked_list_t *list;
458
459 list = this->config->get_traffic_selectors(this->config, local,
460 supplied, get_dynamic_host(this->ike_sa, local));
461 if (list->get_first(list, (void**)&ts) == SUCCESS)
462 {
463 if (this->initiator && list->get_count(list) > 1)
464 {
465 DBG1(DBG_IKE, "configuration has more than one %s traffic selector,"
466 " using first only", local ? "local" : "remote");
467 }
468 ts = ts->clone(ts);
469 }
470 else
471 {
472 DBG1(DBG_IKE, "%s traffic selector missing in configuration",
473 local ? "local" : "local");
474 ts = NULL;
475 }
476 list->destroy_offset(list, offsetof(traffic_selector_t, destroy));
477 return ts;
478 }
479
480 /**
481 * Add selected traffic selectors to message
482 */
483 static void add_ts(private_quick_mode_t *this, message_t *message)
484 {
485 id_payload_t *id_payload;
486 host_t *hsi, *hsr;
487
488 if (this->initiator)
489 {
490 hsi = this->ike_sa->get_my_host(this->ike_sa);
491 hsr = this->ike_sa->get_other_host(this->ike_sa);
492 }
493 else
494 {
495 hsr = this->ike_sa->get_my_host(this->ike_sa);
496 hsi = this->ike_sa->get_other_host(this->ike_sa);
497 }
498 /* add ID payload only if negotiating non host2host tunnels */
499 if (!this->tsi->is_host(this->tsi, hsi) ||
500 !this->tsr->is_host(this->tsr, hsr) ||
501 this->tsi->get_protocol(this->tsi) ||
502 this->tsr->get_protocol(this->tsr) ||
503 this->tsi->get_from_port(this->tsi) ||
504 this->tsr->get_from_port(this->tsr) ||
505 this->tsi->get_to_port(this->tsi) != 65535 ||
506 this->tsr->get_to_port(this->tsr) != 65535)
507 {
508 id_payload = id_payload_create_from_ts(this->tsi);
509 message->add_payload(message, &id_payload->payload_interface);
510 id_payload = id_payload_create_from_ts(this->tsr);
511 message->add_payload(message, &id_payload->payload_interface);
512 }
513 }
514
515 /**
516 * Get traffic selectors from received message
517 */
518 static bool get_ts(private_quick_mode_t *this, message_t *message)
519 {
520 traffic_selector_t *tsi = NULL, *tsr = NULL;
521 enumerator_t *enumerator;
522 id_payload_t *id_payload;
523 payload_t *payload;
524 host_t *hsi, *hsr;
525 bool first = TRUE;
526
527 enumerator = message->create_payload_enumerator(message);
528 while (enumerator->enumerate(enumerator, &payload))
529 {
530 if (payload->get_type(payload) == ID_V1)
531 {
532 id_payload = (id_payload_t*)payload;
533
534 if (first)
535 {
536 tsi = id_payload->get_ts(id_payload);
537 first = FALSE;
538 }
539 else
540 {
541 tsr = id_payload->get_ts(id_payload);
542 break;
543 }
544 }
545 }
546 enumerator->destroy(enumerator);
547
548 /* create host2host selectors if ID payloads missing */
549 if (this->initiator)
550 {
551 hsi = this->ike_sa->get_my_host(this->ike_sa);
552 hsr = this->ike_sa->get_other_host(this->ike_sa);
553 }
554 else
555 {
556 hsr = this->ike_sa->get_my_host(this->ike_sa);
557 hsi = this->ike_sa->get_other_host(this->ike_sa);
558 }
559 if (!tsi)
560 {
561 tsi = traffic_selector_create_from_subnet(hsi->clone(hsi),
562 hsi->get_family(hsi) == AF_INET ? 32 : 128, 0, 0);
563 }
564 if (!tsr)
565 {
566 tsr = traffic_selector_create_from_subnet(hsr->clone(hsr),
567 hsr->get_family(hsr) == AF_INET ? 32 : 128, 0, 0);
568 }
569 if (!this->initiator && this->mode == MODE_TRANSPORT && this->udp &&
570 (!tsi->is_host(tsi, hsi) || !tsr->is_host(tsr, hsr)))
571 { /* change TS in case of a NAT in transport mode */
572 DBG2(DBG_IKE, "changing received traffic selectors %R=== %R due to NAT",
573 tsi, tsr);
574 tsi->set_address(tsi, hsi);
575 tsr->set_address(tsr, hsr);
576 }
577
578 if (this->initiator)
579 {
580 /* check if peer selection valid */
581 if (!tsr->is_contained_in(tsr, this->tsr) ||
582 !tsi->is_contained_in(tsi, this->tsi))
583 {
584 DBG1(DBG_IKE, "peer selected invalid traffic selectors: ",
585 "%R for %R, %R for %R", tsi, this->tsi, tsr, this->tsr);
586 tsi->destroy(tsi);
587 tsr->destroy(tsr);
588 return FALSE;
589 }
590 this->tsi->destroy(this->tsi);
591 this->tsr->destroy(this->tsr);
592 this->tsi = tsi;
593 this->tsr = tsr;
594 }
595 else
596 {
597 this->tsi = tsi;
598 this->tsr = tsr;
599 }
600 return TRUE;
601 }
602
603 /**
604 * Add NAT-OA payloads
605 */
606 static void add_nat_oa_payloads(private_quick_mode_t *this, message_t *message)
607 {
608 identification_t *id;
609 id_payload_t *nat_oa;
610 host_t *src, *dst;
611
612 src = message->get_source(message);
613 dst = message->get_destination(message);
614
615 src = this->initiator ? src : dst;
616 dst = this->initiator ? dst : src;
617
618 /* first NAT-OA is the initiator's address */
619 id = identification_create_from_sockaddr(src->get_sockaddr(src));
620 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
621 message->add_payload(message, (payload_t*)nat_oa);
622 id->destroy(id);
623
624 /* second NAT-OA is that of the responder */
625 id = identification_create_from_sockaddr(dst->get_sockaddr(dst));
626 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
627 message->add_payload(message, (payload_t*)nat_oa);
628 id->destroy(id);
629 }
630
631 /**
632 * Look up lifetimes
633 */
634 static void get_lifetimes(private_quick_mode_t *this)
635 {
636 lifetime_cfg_t *lft;
637
638 lft = this->config->get_lifetime(this->config);
639 if (lft->time.life)
640 {
641 this->lifetime = lft->time.life;
642 }
643 else if (lft->bytes.life)
644 {
645 this->lifebytes = lft->bytes.life;
646 }
647 free(lft);
648 }
649
650 /**
651 * Check and apply lifetimes
652 */
653 static void apply_lifetimes(private_quick_mode_t *this, sa_payload_t *sa_payload)
654 {
655 u_int32_t lifetime;
656 u_int64_t lifebytes;
657
658 lifetime = sa_payload->get_lifetime(sa_payload);
659 lifebytes = sa_payload->get_lifebytes(sa_payload);
660 if (this->lifetime != lifetime)
661 {
662 DBG1(DBG_IKE, "received %us lifetime, configured %us",
663 lifetime, this->lifetime);
664 this->lifetime = lifetime;
665 }
666 if (this->lifebytes != lifebytes)
667 {
668 DBG1(DBG_IKE, "received %llu lifebytes, configured %llu",
669 lifebytes, this->lifebytes);
670 this->lifebytes = lifebytes;
671 }
672 }
673
674 /**
675 * Set the task ready to build notify error message
676 */
677 static status_t send_notify(private_quick_mode_t *this, notify_type_t type)
678 {
679 notify_payload_t *notify;
680
681 notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
682 PROTO_ESP, type);
683 notify->set_spi(notify, this->spi_i);
684
685 this->ike_sa->queue_task(this->ike_sa,
686 (task_t*)informational_create(this->ike_sa, notify));
687 /* cancel all active/passive tasks in favour of informational */
688 this->ike_sa->flush_queue(this->ike_sa,
689 this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
690 return ALREADY_DONE;
691 }
692
693 METHOD(task_t, build_i, status_t,
694 private_quick_mode_t *this, message_t *message)
695 {
696 switch (this->state)
697 {
698 case QM_INIT:
699 {
700 enumerator_t *enumerator;
701 sa_payload_t *sa_payload;
702 linked_list_t *list, *tsi, *tsr;
703 proposal_t *proposal;
704 diffie_hellman_group_t group;
705
706 this->udp = this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY);
707 this->mode = this->config->get_mode(this->config);
708 this->child_sa = child_sa_create(
709 this->ike_sa->get_my_host(this->ike_sa),
710 this->ike_sa->get_other_host(this->ike_sa),
711 this->config, this->reqid, this->udp);
712
713 if (this->udp && this->mode == MODE_TRANSPORT)
714 {
715 /* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
716 add_nat_oa_payloads(this, message);
717 }
718
719 if (this->config->use_ipcomp(this->config))
720 {
721 if (this->udp)
722 {
723 DBG1(DBG_IKE, "IPComp is not supported if either peer is "
724 "natted, IPComp disabled");
725 }
726 else
727 {
728 this->cpi_i = this->child_sa->alloc_cpi(this->child_sa);
729 if (!this->cpi_i)
730 {
731 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, "
732 "IPComp disabled");
733 }
734 }
735 }
736
737 this->spi_i = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
738 if (!this->spi_i)
739 {
740 DBG1(DBG_IKE, "allocating SPI from kernel failed");
741 return FAILED;
742 }
743
744 list = this->config->get_proposals(this->config, FALSE);
745 enumerator = list->create_enumerator(list);
746 while (enumerator->enumerate(enumerator, &proposal))
747 {
748 proposal->set_spi(proposal, this->spi_i);
749 }
750 enumerator->destroy(enumerator);
751
752 get_lifetimes(this);
753 sa_payload = sa_payload_create_from_proposals_v1(list,
754 this->lifetime, this->lifebytes, AUTH_NONE,
755 this->mode, this->udp, this->cpi_i);
756 list->destroy_offset(list, offsetof(proposal_t, destroy));
757 message->add_payload(message, &sa_payload->payload_interface);
758
759 if (!add_nonce(this, &this->nonce_i, message))
760 {
761 return FAILED;
762 }
763
764 group = this->config->get_dh_group(this->config);
765 if (group != MODP_NONE)
766 {
767 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
768 group);
769 if (!this->dh)
770 {
771 DBG1(DBG_IKE, "configured DH group %N not supported",
772 diffie_hellman_group_names, group);
773 return FAILED;
774 }
775 add_ke(this, message);
776 }
777 if (!this->tsi)
778 {
779 this->tsi = select_ts(this, TRUE, NULL);
780 }
781 if (!this->tsr)
782 {
783 this->tsr = select_ts(this, FALSE, NULL);
784 }
785 tsi = linked_list_create();
786 tsr = linked_list_create();
787 tsi->insert_last(tsi, this->tsi);
788 tsr->insert_last(tsr, this->tsr);
789 this->tsi = this->tsr = NULL;
790 charon->bus->narrow(charon->bus, this->child_sa,
791 NARROW_INITIATOR_PRE_AUTH, tsi, tsr);
792 tsi->remove_first(tsi, (void**)&this->tsi);
793 tsr->remove_first(tsr, (void**)&this->tsr);
794 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
795 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
796 if (!this->tsi || !this->tsr)
797 {
798 return FAILED;
799 }
800 add_ts(this, message);
801 return NEED_MORE;
802 }
803 case QM_NEGOTIATED:
804 {
805 return SUCCESS;
806 }
807 default:
808 return FAILED;
809 }
810 }
811
812 /**
813 * Check for notify errors, return TRUE if error found
814 */
815 static bool has_notify_errors(private_quick_mode_t *this, message_t *message)
816 {
817 enumerator_t *enumerator;
818 payload_t *payload;
819 bool err = FALSE;
820
821 enumerator = message->create_payload_enumerator(message);
822 while (enumerator->enumerate(enumerator, &payload))
823 {
824 if (payload->get_type(payload) == NOTIFY_V1)
825 {
826 notify_payload_t *notify;
827 notify_type_t type;
828
829 notify = (notify_payload_t*)payload;
830 type = notify->get_notify_type(notify);
831 if (type < 16384)
832 {
833
834 DBG1(DBG_IKE, "received %N error notify",
835 notify_type_names, type);
836 err = TRUE;
837 }
838 else
839 {
840 DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
841 }
842 }
843 }
844 enumerator->destroy(enumerator);
845
846 return err;
847 }
848
849 /**
850 * Check if this is a rekey for an existing CHILD_SA, reuse reqid if so
851 */
852 static void check_for_rekeyed_child(private_quick_mode_t *this)
853 {
854 enumerator_t *enumerator, *policies;
855 traffic_selector_t *local, *remote;
856 child_sa_t *child_sa;
857
858 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
859 while (this->reqid == 0 && enumerator->enumerate(enumerator, &child_sa))
860 {
861 if (child_sa->get_state(child_sa) == CHILD_INSTALLED &&
862 streq(child_sa->get_name(child_sa),
863 this->config->get_name(this->config)))
864 {
865 policies = child_sa->create_policy_enumerator(child_sa);
866 if (policies->enumerate(policies, &local, &remote))
867 {
868 if (local->equals(local, this->tsr) &&
869 remote->equals(remote, this->tsi) &&
870 this->proposal->equals(this->proposal,
871 child_sa->get_proposal(child_sa)))
872 {
873 this->reqid = child_sa->get_reqid(child_sa);
874 this->rekey = child_sa->get_spi(child_sa, TRUE);
875 child_sa->set_state(child_sa, CHILD_REKEYING);
876 DBG1(DBG_IKE, "detected rekeying of CHILD_SA %s{%u}",
877 child_sa->get_name(child_sa), this->reqid);
878 }
879 }
880 policies->destroy(policies);
881 }
882 }
883 enumerator->destroy(enumerator);
884 }
885
886 METHOD(task_t, process_r, status_t,
887 private_quick_mode_t *this, message_t *message)
888 {
889 switch (this->state)
890 {
891 case QM_INIT:
892 {
893 sa_payload_t *sa_payload;
894 linked_list_t *tsi, *tsr, *list = NULL;
895 peer_cfg_t *peer_cfg;
896 u_int16_t group;
897 bool private;
898
899 sa_payload = (sa_payload_t*)message->get_payload(message,
900 SECURITY_ASSOCIATION_V1);
901 if (!sa_payload)
902 {
903 DBG1(DBG_IKE, "sa payload missing");
904 return send_notify(this, INVALID_PAYLOAD_TYPE);
905 }
906
907 this->mode = sa_payload->get_encap_mode(sa_payload, &this->udp);
908
909 if (!get_ts(this, message))
910 {
911 return FAILED;
912 }
913 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
914 tsi = linked_list_create();
915 tsr = linked_list_create();
916 tsi->insert_last(tsi, this->tsi);
917 tsr->insert_last(tsr, this->tsr);
918 this->tsi = this->tsr = NULL;
919 this->config = peer_cfg->select_child_cfg(peer_cfg, tsr, tsi,
920 get_dynamic_host(this->ike_sa, TRUE),
921 get_dynamic_host(this->ike_sa, FALSE));
922 if (this->config)
923 {
924 this->tsi = select_ts(this, FALSE, tsi);
925 this->tsr = select_ts(this, TRUE, tsr);
926 }
927 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
928 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
929 if (!this->config || !this->tsi || !this->tsr)
930 {
931 DBG1(DBG_IKE, "no matching CHILD_SA config found");
932 return send_notify(this, INVALID_ID_INFORMATION);
933 }
934
935 if (this->config->use_ipcomp(this->config))
936 {
937 if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
938 {
939 DBG1(DBG_IKE, "IPComp is not supported if either peer is "
940 "natted, IPComp disabled");
941 }
942 else
943 {
944 list = sa_payload->get_ipcomp_proposals(sa_payload,
945 &this->cpi_i);
946 if (!list->get_count(list))
947 {
948 DBG1(DBG_IKE, "expected IPComp proposal but peer did "
949 "not send one, IPComp disabled");
950 this->cpi_i = 0;
951 }
952 }
953 }
954 if (!list || !list->get_count(list))
955 {
956 DESTROY_IF(list);
957 list = sa_payload->get_proposals(sa_payload);
958 }
959 private = this->ike_sa->supports_extension(this->ike_sa,
960 EXT_STRONGSWAN);
961 this->proposal = this->config->select_proposal(this->config,
962 list, FALSE, private);
963 list->destroy_offset(list, offsetof(proposal_t, destroy));
964
965 get_lifetimes(this);
966 apply_lifetimes(this, sa_payload);
967
968 if (!this->proposal)
969 {
970 DBG1(DBG_IKE, "no matching proposal found, sending %N",
971 notify_type_names, NO_PROPOSAL_CHOSEN);
972 return send_notify(this, NO_PROPOSAL_CHOSEN);
973 }
974 this->spi_i = this->proposal->get_spi(this->proposal);
975
976 if (!get_nonce(this, &this->nonce_i, message))
977 {
978 return send_notify(this, INVALID_PAYLOAD_TYPE);
979 }
980
981 if (this->proposal->get_algorithm(this->proposal,
982 DIFFIE_HELLMAN_GROUP, &group, NULL))
983 {
984 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
985 group);
986 if (!this->dh)
987 {
988 DBG1(DBG_IKE, "negotiated DH group %N not supported",
989 diffie_hellman_group_names, group);
990 return send_notify(this, INVALID_KEY_INFORMATION);
991 }
992 if (!get_ke(this, message))
993 {
994 return send_notify(this, INVALID_PAYLOAD_TYPE);
995 }
996 }
997
998 check_for_rekeyed_child(this);
999
1000 this->child_sa = child_sa_create(
1001 this->ike_sa->get_my_host(this->ike_sa),
1002 this->ike_sa->get_other_host(this->ike_sa),
1003 this->config, this->reqid, this->udp);
1004
1005 tsi = linked_list_create();
1006 tsr = linked_list_create();
1007 tsi->insert_last(tsi, this->tsi);
1008 tsr->insert_last(tsr, this->tsr);
1009 this->tsi = this->tsr = NULL;
1010 charon->bus->narrow(charon->bus, this->child_sa,
1011 NARROW_RESPONDER, tsr, tsi);
1012 if (tsi->remove_first(tsi, (void**)&this->tsi) != SUCCESS ||
1013 tsr->remove_first(tsr, (void**)&this->tsr) != SUCCESS)
1014 {
1015 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
1016 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
1017 return send_notify(this, INVALID_ID_INFORMATION);
1018 }
1019 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
1020 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
1021
1022 return NEED_MORE;
1023 }
1024 case QM_NEGOTIATED:
1025 {
1026 if (message->get_exchange_type(message) == INFORMATIONAL_V1 ||
1027 has_notify_errors(this, message))
1028 {
1029 return SUCCESS;
1030 }
1031 if (!install(this))
1032 {
1033 ike_sa_t *ike_sa = this->ike_sa;
1034 task_t *task;
1035
1036 task = (task_t*)quick_delete_create(this->ike_sa,
1037 this->proposal->get_protocol(this->proposal),
1038 this->spi_i, TRUE, TRUE);
1039 /* flush_queue() destroys the current task */
1040 ike_sa->flush_queue(ike_sa, TASK_QUEUE_PASSIVE);
1041 ike_sa->queue_task(ike_sa, task);
1042 return ALREADY_DONE;
1043 }
1044 return SUCCESS;
1045 }
1046 default:
1047 return FAILED;
1048 }
1049 }
1050
1051 METHOD(task_t, build_r, status_t,
1052 private_quick_mode_t *this, message_t *message)
1053 {
1054 switch (this->state)
1055 {
1056 case QM_INIT:
1057 {
1058 sa_payload_t *sa_payload;
1059
1060 this->spi_r = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
1061 if (!this->spi_r)
1062 {
1063 DBG1(DBG_IKE, "allocating SPI from kernel failed");
1064 return send_notify(this, NO_PROPOSAL_CHOSEN);
1065 }
1066 this->proposal->set_spi(this->proposal, this->spi_r);
1067
1068 if (this->cpi_i)
1069 {
1070 this->cpi_r = this->child_sa->alloc_cpi(this->child_sa);
1071 if (!this->cpi_r)
1072 {
1073 DBG1(DBG_IKE, "unable to allocate a CPI from "
1074 "kernel, IPComp disabled");
1075 return send_notify(this, NO_PROPOSAL_CHOSEN);
1076 }
1077 }
1078
1079 if (this->udp && this->mode == MODE_TRANSPORT)
1080 {
1081 /* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
1082 add_nat_oa_payloads(this, message);
1083 }
1084
1085 sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
1086 this->lifetime, this->lifebytes, AUTH_NONE,
1087 this->mode, this->udp, this->cpi_r);
1088 message->add_payload(message, &sa_payload->payload_interface);
1089
1090 if (!add_nonce(this, &this->nonce_r, message))
1091 {
1092 return FAILED;
1093 }
1094 if (this->dh)
1095 {
1096 add_ke(this, message);
1097 }
1098
1099 add_ts(this, message);
1100
1101 this->state = QM_NEGOTIATED;
1102 return NEED_MORE;
1103 }
1104 default:
1105 return FAILED;
1106 }
1107 }
1108
1109 METHOD(task_t, process_i, status_t,
1110 private_quick_mode_t *this, message_t *message)
1111 {
1112 switch (this->state)
1113 {
1114 case QM_INIT:
1115 {
1116 sa_payload_t *sa_payload;
1117 linked_list_t *list = NULL;
1118 bool private;
1119
1120 sa_payload = (sa_payload_t*)message->get_payload(message,
1121 SECURITY_ASSOCIATION_V1);
1122 if (!sa_payload)
1123 {
1124 DBG1(DBG_IKE, "sa payload missing");
1125 return send_notify(this, NO_PROPOSAL_CHOSEN);
1126 }
1127 if (this->cpi_i)
1128 {
1129 list = sa_payload->get_ipcomp_proposals(sa_payload,
1130 &this->cpi_r);
1131 if (!list->get_count(list))
1132 {
1133 DBG1(DBG_IKE, "peer did not acccept our IPComp proposal, "
1134 "IPComp disabled");
1135 this->cpi_i = 0;
1136 }
1137 }
1138 if (!list || !list->get_count(list))
1139 {
1140 DESTROY_IF(list);
1141 list = sa_payload->get_proposals(sa_payload);
1142 }
1143 private = this->ike_sa->supports_extension(this->ike_sa,
1144 EXT_STRONGSWAN);
1145 this->proposal = this->config->select_proposal(this->config,
1146 list, FALSE, private);
1147 list->destroy_offset(list, offsetof(proposal_t, destroy));
1148 if (!this->proposal)
1149 {
1150 DBG1(DBG_IKE, "no matching proposal found");
1151 return send_notify(this, NO_PROPOSAL_CHOSEN);
1152 }
1153 this->spi_r = this->proposal->get_spi(this->proposal);
1154
1155 apply_lifetimes(this, sa_payload);
1156
1157 if (!get_nonce(this, &this->nonce_r, message))
1158 {
1159 return send_notify(this, INVALID_PAYLOAD_TYPE);
1160 }
1161 if (this->dh && !get_ke(this, message))
1162 {
1163 return send_notify(this, INVALID_KEY_INFORMATION);
1164 }
1165 if (!get_ts(this, message))
1166 {
1167 return send_notify(this, INVALID_PAYLOAD_TYPE);
1168 }
1169 if (!install(this))
1170 {
1171 return send_notify(this, NO_PROPOSAL_CHOSEN);
1172 }
1173 this->state = QM_NEGOTIATED;
1174 return NEED_MORE;
1175 }
1176 default:
1177 return FAILED;
1178 }
1179 }
1180
1181 METHOD(task_t, get_type, task_type_t,
1182 private_quick_mode_t *this)
1183 {
1184 return TASK_QUICK_MODE;
1185 }
1186
1187 METHOD(quick_mode_t, use_reqid, void,
1188 private_quick_mode_t *this, u_int32_t reqid)
1189 {
1190 this->reqid = reqid;
1191 }
1192
1193 METHOD(quick_mode_t, rekey, void,
1194 private_quick_mode_t *this, u_int32_t spi)
1195 {
1196 this->rekey = spi;
1197 }
1198
1199 METHOD(task_t, migrate, void,
1200 private_quick_mode_t *this, ike_sa_t *ike_sa)
1201 {
1202 chunk_free(&this->nonce_i);
1203 chunk_free(&this->nonce_r);
1204 DESTROY_IF(this->tsi);
1205 DESTROY_IF(this->tsr);
1206 DESTROY_IF(this->proposal);
1207 DESTROY_IF(this->child_sa);
1208 DESTROY_IF(this->dh);
1209
1210 this->ike_sa = ike_sa;
1211 this->keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa);
1212 this->state = QM_INIT;
1213 this->tsi = NULL;
1214 this->tsr = NULL;
1215 this->proposal = NULL;
1216 this->child_sa = NULL;
1217 this->dh = NULL;
1218 this->spi_i = 0;
1219 this->spi_r = 0;
1220
1221 if (!this->initiator)
1222 {
1223 DESTROY_IF(this->config);
1224 this->config = NULL;
1225 }
1226 }
1227
1228 METHOD(task_t, destroy, void,
1229 private_quick_mode_t *this)
1230 {
1231 chunk_free(&this->nonce_i);
1232 chunk_free(&this->nonce_r);
1233 DESTROY_IF(this->tsi);
1234 DESTROY_IF(this->tsr);
1235 DESTROY_IF(this->proposal);
1236 DESTROY_IF(this->child_sa);
1237 DESTROY_IF(this->config);
1238 DESTROY_IF(this->dh);
1239 free(this);
1240 }
1241
1242 /*
1243 * Described in header.
1244 */
1245 quick_mode_t *quick_mode_create(ike_sa_t *ike_sa, child_cfg_t *config,
1246 traffic_selector_t *tsi, traffic_selector_t *tsr)
1247 {
1248 private_quick_mode_t *this;
1249
1250 INIT(this,
1251 .public = {
1252 .task = {
1253 .get_type = _get_type,
1254 .migrate = _migrate,
1255 .destroy = _destroy,
1256 },
1257 .use_reqid = _use_reqid,
1258 .rekey = _rekey,
1259 },
1260 .ike_sa = ike_sa,
1261 .initiator = config != NULL,
1262 .config = config,
1263 .keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa),
1264 .state = QM_INIT,
1265 .tsi = tsi ? tsi->clone(tsi) : NULL,
1266 .tsr = tsr ? tsr->clone(tsr) : NULL,
1267 );
1268
1269 if (config)
1270 {
1271 this->public.task.build = _build_i;
1272 this->public.task.process = _process_i;
1273 }
1274 else
1275 {
1276 this->public.task.build = _build_r;
1277 this->public.task.process = _process_r;
1278 }
1279
1280 return &this->public;
1281 }