39fbd59e0ef83b6879a44c9ec0f314e35ed8e2d7
[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_with_items(this->tsi->clone(this->tsi), NULL);
262 tsr = linked_list_create_with_items(this->tsr->clone(this->tsr), NULL);
263 if (this->initiator)
264 {
265 charon->bus->narrow(charon->bus, this->child_sa,
266 NARROW_INITIATOR_POST_AUTH, tsi, tsr);
267 }
268 else
269 {
270 charon->bus->narrow(charon->bus, this->child_sa,
271 NARROW_RESPONDER_POST, tsr, tsi);
272 }
273 if (tsi->get_count(tsi) == 0 || tsr->get_count(tsr) == 0)
274 {
275 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
276 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
277 DBG1(DBG_IKE, "no acceptable traffic selectors found");
278 return FALSE;
279 }
280
281 if (this->keymat->derive_child_keys(this->keymat, this->proposal, this->dh,
282 this->spi_i, this->spi_r, this->nonce_i, this->nonce_r,
283 &encr_i, &integ_i, &encr_r, &integ_r))
284 {
285 if (this->initiator)
286 {
287 status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
288 this->spi_i, this->cpi_i, TRUE, FALSE, tsi, tsr);
289 status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
290 this->spi_r, this->cpi_r, FALSE, FALSE, tsi, tsr);
291 }
292 else
293 {
294 status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
295 this->spi_r, this->cpi_r, TRUE, FALSE, tsr, tsi);
296 status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
297 this->spi_i, this->cpi_i, FALSE, FALSE, tsr, tsi);
298 }
299 }
300 chunk_clear(&integ_i);
301 chunk_clear(&integ_r);
302 chunk_clear(&encr_i);
303 chunk_clear(&encr_r);
304
305 if (status_i != SUCCESS || status_o != SUCCESS)
306 {
307 DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
308 (status_i != SUCCESS) ? "inbound " : "",
309 (status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
310 (status_o != SUCCESS) ? "outbound " : "");
311 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
312 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
313 return FALSE;
314 }
315
316 if (this->initiator)
317 {
318 status = this->child_sa->add_policies(this->child_sa, tsi, tsr);
319 }
320 else
321 {
322 status = this->child_sa->add_policies(this->child_sa, tsr, tsi);
323 }
324 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
325 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
326 if (status != SUCCESS)
327 {
328 DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
329 return FALSE;
330 }
331
332 charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
333 this->dh, this->nonce_i, this->nonce_r);
334
335 /* add to IKE_SA, and remove from task */
336 this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
337 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
338
339 DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
340 "with SPIs %.8x_i %.8x_o and TS %#R=== %#R",
341 this->child_sa->get_name(this->child_sa),
342 this->child_sa->get_reqid(this->child_sa),
343 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
344 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
345 this->child_sa->get_traffic_selectors(this->child_sa, TRUE),
346 this->child_sa->get_traffic_selectors(this->child_sa, FALSE));
347
348 if (this->rekey)
349 {
350 old = this->ike_sa->get_child_sa(this->ike_sa,
351 this->proposal->get_protocol(this->proposal),
352 this->rekey, TRUE);
353 }
354 if (old)
355 {
356 charon->bus->child_rekey(charon->bus, old, this->child_sa);
357 }
358 else
359 {
360 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
361 }
362 if (!this->rekey)
363 {
364 schedule_inactivity_timeout(this);
365 }
366 this->child_sa = NULL;
367 return TRUE;
368 }
369
370 /**
371 * Generate and add NONCE
372 */
373 static bool add_nonce(private_quick_mode_t *this, chunk_t *nonce,
374 message_t *message)
375 {
376 nonce_payload_t *nonce_payload;
377 nonce_gen_t *nonceg;
378
379 nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
380 if (!nonceg)
381 {
382 DBG1(DBG_IKE, "no nonce generator found to create nonce");
383 return FALSE;
384 }
385 if (!nonceg->allocate_nonce(nonceg, NONCE_SIZE, nonce))
386 {
387 DBG1(DBG_IKE, "nonce allocation failed");
388 nonceg->destroy(nonceg);
389 return FALSE;
390 }
391 nonceg->destroy(nonceg);
392
393 nonce_payload = nonce_payload_create(NONCE_V1);
394 nonce_payload->set_nonce(nonce_payload, *nonce);
395 message->add_payload(message, &nonce_payload->payload_interface);
396
397 return TRUE;
398 }
399
400 /**
401 * Extract nonce from NONCE payload
402 */
403 static bool get_nonce(private_quick_mode_t *this, chunk_t *nonce,
404 message_t *message)
405 {
406 nonce_payload_t *nonce_payload;
407
408 nonce_payload = (nonce_payload_t*)message->get_payload(message, NONCE_V1);
409 if (!nonce_payload)
410 {
411 DBG1(DBG_IKE, "NONCE payload missing in message");
412 return FALSE;
413 }
414 *nonce = nonce_payload->get_nonce(nonce_payload);
415
416 return TRUE;
417 }
418
419 /**
420 * Add KE payload to message
421 */
422 static void add_ke(private_quick_mode_t *this, message_t *message)
423 {
424 ke_payload_t *ke_payload;
425
426 ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1, this->dh);
427 message->add_payload(message, &ke_payload->payload_interface);
428 }
429
430 /**
431 * Get DH value from a KE payload
432 */
433 static bool get_ke(private_quick_mode_t *this, message_t *message)
434 {
435 ke_payload_t *ke_payload;
436
437 ke_payload = (ke_payload_t*)message->get_payload(message, KEY_EXCHANGE_V1);
438 if (!ke_payload)
439 {
440 DBG1(DBG_IKE, "KE payload missing");
441 return FALSE;
442 }
443 this->dh->set_other_public_value(this->dh,
444 ke_payload->get_key_exchange_data(ke_payload));
445 return TRUE;
446 }
447
448 /**
449 * Select a traffic selector from configuration
450 */
451 static traffic_selector_t* select_ts(private_quick_mode_t *this, bool local,
452 linked_list_t *supplied)
453 {
454 traffic_selector_t *ts;
455 linked_list_t *list;
456
457 list = this->config->get_traffic_selectors(this->config, local,
458 supplied, get_dynamic_host(this->ike_sa, local));
459 if (list->get_first(list, (void**)&ts) == SUCCESS)
460 {
461 if (this->initiator && list->get_count(list) > 1)
462 {
463 DBG1(DBG_IKE, "configuration has more than one %s traffic selector,"
464 " using first only", local ? "local" : "remote");
465 }
466 ts = ts->clone(ts);
467 }
468 else
469 {
470 DBG1(DBG_IKE, "%s traffic selector missing in configuration",
471 local ? "local" : "local");
472 ts = NULL;
473 }
474 list->destroy_offset(list, offsetof(traffic_selector_t, destroy));
475 return ts;
476 }
477
478 /**
479 * Add selected traffic selectors to message
480 */
481 static void add_ts(private_quick_mode_t *this, message_t *message)
482 {
483 id_payload_t *id_payload;
484 host_t *hsi, *hsr;
485
486 if (this->initiator)
487 {
488 hsi = this->ike_sa->get_my_host(this->ike_sa);
489 hsr = this->ike_sa->get_other_host(this->ike_sa);
490 }
491 else
492 {
493 hsr = this->ike_sa->get_my_host(this->ike_sa);
494 hsi = this->ike_sa->get_other_host(this->ike_sa);
495 }
496 /* add ID payload only if negotiating non host2host tunnels */
497 if (!this->tsi->is_host(this->tsi, hsi) ||
498 !this->tsr->is_host(this->tsr, hsr) ||
499 this->tsi->get_protocol(this->tsi) ||
500 this->tsr->get_protocol(this->tsr) ||
501 this->tsi->get_from_port(this->tsi) ||
502 this->tsr->get_from_port(this->tsr) ||
503 this->tsi->get_to_port(this->tsi) != 65535 ||
504 this->tsr->get_to_port(this->tsr) != 65535)
505 {
506 id_payload = id_payload_create_from_ts(this->tsi);
507 message->add_payload(message, &id_payload->payload_interface);
508 id_payload = id_payload_create_from_ts(this->tsr);
509 message->add_payload(message, &id_payload->payload_interface);
510 }
511 }
512
513 /**
514 * Get traffic selectors from received message
515 */
516 static bool get_ts(private_quick_mode_t *this, message_t *message)
517 {
518 traffic_selector_t *tsi = NULL, *tsr = NULL;
519 enumerator_t *enumerator;
520 id_payload_t *id_payload;
521 payload_t *payload;
522 host_t *hsi, *hsr;
523 bool first = TRUE;
524
525 enumerator = message->create_payload_enumerator(message);
526 while (enumerator->enumerate(enumerator, &payload))
527 {
528 if (payload->get_type(payload) == ID_V1)
529 {
530 id_payload = (id_payload_t*)payload;
531
532 if (first)
533 {
534 tsi = id_payload->get_ts(id_payload);
535 first = FALSE;
536 }
537 else
538 {
539 tsr = id_payload->get_ts(id_payload);
540 break;
541 }
542 }
543 }
544 enumerator->destroy(enumerator);
545
546 /* create host2host selectors if ID payloads missing */
547 if (this->initiator)
548 {
549 hsi = this->ike_sa->get_my_host(this->ike_sa);
550 hsr = this->ike_sa->get_other_host(this->ike_sa);
551 }
552 else
553 {
554 hsr = this->ike_sa->get_my_host(this->ike_sa);
555 hsi = this->ike_sa->get_other_host(this->ike_sa);
556 }
557 if (!tsi)
558 {
559 tsi = traffic_selector_create_from_subnet(hsi->clone(hsi),
560 hsi->get_family(hsi) == AF_INET ? 32 : 128, 0, 0);
561 }
562 if (!tsr)
563 {
564 tsr = traffic_selector_create_from_subnet(hsr->clone(hsr),
565 hsr->get_family(hsr) == AF_INET ? 32 : 128, 0, 0);
566 }
567 if (!this->initiator && this->mode == MODE_TRANSPORT && this->udp &&
568 (!tsi->is_host(tsi, hsi) || !tsr->is_host(tsr, hsr)))
569 { /* change TS in case of a NAT in transport mode */
570 DBG2(DBG_IKE, "changing received traffic selectors %R=== %R due to NAT",
571 tsi, tsr);
572 tsi->set_address(tsi, hsi);
573 tsr->set_address(tsr, hsr);
574 }
575
576 if (this->initiator)
577 {
578 /* check if peer selection valid */
579 if (!tsr->is_contained_in(tsr, this->tsr) ||
580 !tsi->is_contained_in(tsi, this->tsi))
581 {
582 DBG1(DBG_IKE, "peer selected invalid traffic selectors: ",
583 "%R for %R, %R for %R", tsi, this->tsi, tsr, this->tsr);
584 tsi->destroy(tsi);
585 tsr->destroy(tsr);
586 return FALSE;
587 }
588 this->tsi->destroy(this->tsi);
589 this->tsr->destroy(this->tsr);
590 this->tsi = tsi;
591 this->tsr = tsr;
592 }
593 else
594 {
595 this->tsi = tsi;
596 this->tsr = tsr;
597 }
598 return TRUE;
599 }
600
601 /**
602 * Add NAT-OA payloads
603 */
604 static void add_nat_oa_payloads(private_quick_mode_t *this, message_t *message)
605 {
606 identification_t *id;
607 id_payload_t *nat_oa;
608 host_t *src, *dst;
609
610 src = message->get_source(message);
611 dst = message->get_destination(message);
612
613 src = this->initiator ? src : dst;
614 dst = this->initiator ? dst : src;
615
616 /* first NAT-OA is the initiator's address */
617 id = identification_create_from_sockaddr(src->get_sockaddr(src));
618 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
619 message->add_payload(message, (payload_t*)nat_oa);
620 id->destroy(id);
621
622 /* second NAT-OA is that of the responder */
623 id = identification_create_from_sockaddr(dst->get_sockaddr(dst));
624 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
625 message->add_payload(message, (payload_t*)nat_oa);
626 id->destroy(id);
627 }
628
629 /**
630 * Look up lifetimes
631 */
632 static void get_lifetimes(private_quick_mode_t *this)
633 {
634 lifetime_cfg_t *lft;
635
636 lft = this->config->get_lifetime(this->config);
637 if (lft->time.life)
638 {
639 this->lifetime = lft->time.life;
640 }
641 else if (lft->bytes.life)
642 {
643 this->lifebytes = lft->bytes.life;
644 }
645 free(lft);
646 }
647
648 /**
649 * Check and apply lifetimes
650 */
651 static void apply_lifetimes(private_quick_mode_t *this, sa_payload_t *sa_payload)
652 {
653 u_int32_t lifetime;
654 u_int64_t lifebytes;
655
656 lifetime = sa_payload->get_lifetime(sa_payload);
657 lifebytes = sa_payload->get_lifebytes(sa_payload);
658 if (this->lifetime != lifetime)
659 {
660 DBG1(DBG_IKE, "received %us lifetime, configured %us",
661 lifetime, this->lifetime);
662 this->lifetime = lifetime;
663 }
664 if (this->lifebytes != lifebytes)
665 {
666 DBG1(DBG_IKE, "received %llu lifebytes, configured %llu",
667 lifebytes, this->lifebytes);
668 this->lifebytes = lifebytes;
669 }
670 }
671
672 /**
673 * Set the task ready to build notify error message
674 */
675 static status_t send_notify(private_quick_mode_t *this, notify_type_t type)
676 {
677 notify_payload_t *notify;
678
679 notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
680 PROTO_ESP, type);
681 notify->set_spi(notify, this->spi_i);
682
683 this->ike_sa->queue_task(this->ike_sa,
684 (task_t*)informational_create(this->ike_sa, notify));
685 /* cancel all active/passive tasks in favour of informational */
686 this->ike_sa->flush_queue(this->ike_sa,
687 this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
688 return ALREADY_DONE;
689 }
690
691 METHOD(task_t, build_i, status_t,
692 private_quick_mode_t *this, message_t *message)
693 {
694 switch (this->state)
695 {
696 case QM_INIT:
697 {
698 enumerator_t *enumerator;
699 sa_payload_t *sa_payload;
700 linked_list_t *list, *tsi, *tsr;
701 proposal_t *proposal;
702 diffie_hellman_group_t group;
703
704 this->udp = this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY);
705 this->mode = this->config->get_mode(this->config);
706 this->child_sa = child_sa_create(
707 this->ike_sa->get_my_host(this->ike_sa),
708 this->ike_sa->get_other_host(this->ike_sa),
709 this->config, this->reqid, this->udp);
710
711 if (this->udp && this->mode == MODE_TRANSPORT)
712 {
713 /* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
714 add_nat_oa_payloads(this, message);
715 }
716
717 if (this->config->use_ipcomp(this->config))
718 {
719 if (this->udp)
720 {
721 DBG1(DBG_IKE, "IPComp is not supported if either peer is "
722 "natted, IPComp disabled");
723 }
724 else
725 {
726 this->cpi_i = this->child_sa->alloc_cpi(this->child_sa);
727 if (!this->cpi_i)
728 {
729 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, "
730 "IPComp disabled");
731 }
732 }
733 }
734
735 this->spi_i = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
736 if (!this->spi_i)
737 {
738 DBG1(DBG_IKE, "allocating SPI from kernel failed");
739 return FAILED;
740 }
741
742 list = this->config->get_proposals(this->config, FALSE);
743 enumerator = list->create_enumerator(list);
744 while (enumerator->enumerate(enumerator, &proposal))
745 {
746 proposal->set_spi(proposal, this->spi_i);
747 }
748 enumerator->destroy(enumerator);
749
750 get_lifetimes(this);
751 sa_payload = sa_payload_create_from_proposals_v1(list,
752 this->lifetime, this->lifebytes, AUTH_NONE,
753 this->mode, this->udp, this->cpi_i);
754 list->destroy_offset(list, offsetof(proposal_t, destroy));
755 message->add_payload(message, &sa_payload->payload_interface);
756
757 if (!add_nonce(this, &this->nonce_i, message))
758 {
759 return FAILED;
760 }
761
762 group = this->config->get_dh_group(this->config);
763 if (group != MODP_NONE)
764 {
765 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
766 group);
767 if (!this->dh)
768 {
769 DBG1(DBG_IKE, "configured DH group %N not supported",
770 diffie_hellman_group_names, group);
771 return FAILED;
772 }
773 add_ke(this, message);
774 }
775 if (!this->tsi)
776 {
777 this->tsi = select_ts(this, TRUE, NULL);
778 }
779 if (!this->tsr)
780 {
781 this->tsr = select_ts(this, FALSE, NULL);
782 }
783 tsi = linked_list_create_with_items(this->tsi, NULL);
784 tsr = linked_list_create_with_items(this->tsr, NULL);
785 this->tsi = this->tsr = NULL;
786 charon->bus->narrow(charon->bus, this->child_sa,
787 NARROW_INITIATOR_PRE_AUTH, tsi, tsr);
788 tsi->remove_first(tsi, (void**)&this->tsi);
789 tsr->remove_first(tsr, (void**)&this->tsr);
790 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
791 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
792 if (!this->tsi || !this->tsr)
793 {
794 return FAILED;
795 }
796 add_ts(this, message);
797 return NEED_MORE;
798 }
799 case QM_NEGOTIATED:
800 {
801 return SUCCESS;
802 }
803 default:
804 return FAILED;
805 }
806 }
807
808 /**
809 * Check for notify errors, return TRUE if error found
810 */
811 static bool has_notify_errors(private_quick_mode_t *this, message_t *message)
812 {
813 enumerator_t *enumerator;
814 payload_t *payload;
815 bool err = FALSE;
816
817 enumerator = message->create_payload_enumerator(message);
818 while (enumerator->enumerate(enumerator, &payload))
819 {
820 if (payload->get_type(payload) == NOTIFY_V1)
821 {
822 notify_payload_t *notify;
823 notify_type_t type;
824
825 notify = (notify_payload_t*)payload;
826 type = notify->get_notify_type(notify);
827 if (type < 16384)
828 {
829
830 DBG1(DBG_IKE, "received %N error notify",
831 notify_type_names, type);
832 err = TRUE;
833 }
834 else
835 {
836 DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
837 }
838 }
839 }
840 enumerator->destroy(enumerator);
841
842 return err;
843 }
844
845 /**
846 * Check if this is a rekey for an existing CHILD_SA, reuse reqid if so
847 */
848 static void check_for_rekeyed_child(private_quick_mode_t *this)
849 {
850 enumerator_t *enumerator, *policies;
851 traffic_selector_t *local, *remote;
852 child_sa_t *child_sa;
853
854 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
855 while (this->reqid == 0 && enumerator->enumerate(enumerator, &child_sa))
856 {
857 if (child_sa->get_state(child_sa) == CHILD_INSTALLED &&
858 streq(child_sa->get_name(child_sa),
859 this->config->get_name(this->config)))
860 {
861 policies = child_sa->create_policy_enumerator(child_sa);
862 if (policies->enumerate(policies, &local, &remote))
863 {
864 if (local->equals(local, this->tsr) &&
865 remote->equals(remote, this->tsi) &&
866 this->proposal->equals(this->proposal,
867 child_sa->get_proposal(child_sa)))
868 {
869 this->reqid = child_sa->get_reqid(child_sa);
870 this->rekey = child_sa->get_spi(child_sa, TRUE);
871 child_sa->set_state(child_sa, CHILD_REKEYING);
872 DBG1(DBG_IKE, "detected rekeying of CHILD_SA %s{%u}",
873 child_sa->get_name(child_sa), this->reqid);
874 }
875 }
876 policies->destroy(policies);
877 }
878 }
879 enumerator->destroy(enumerator);
880 }
881
882 METHOD(task_t, process_r, status_t,
883 private_quick_mode_t *this, message_t *message)
884 {
885 switch (this->state)
886 {
887 case QM_INIT:
888 {
889 sa_payload_t *sa_payload;
890 linked_list_t *tsi, *tsr, *list = NULL;
891 peer_cfg_t *peer_cfg;
892 u_int16_t group;
893 bool private;
894
895 sa_payload = (sa_payload_t*)message->get_payload(message,
896 SECURITY_ASSOCIATION_V1);
897 if (!sa_payload)
898 {
899 DBG1(DBG_IKE, "sa payload missing");
900 return send_notify(this, INVALID_PAYLOAD_TYPE);
901 }
902
903 this->mode = sa_payload->get_encap_mode(sa_payload, &this->udp);
904
905 if (!get_ts(this, message))
906 {
907 return FAILED;
908 }
909 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
910 tsi = linked_list_create_with_items(this->tsi, NULL);
911 tsr = linked_list_create_with_items(this->tsr, NULL);
912 this->tsi = this->tsr = NULL;
913 this->config = peer_cfg->select_child_cfg(peer_cfg, tsr, tsi,
914 get_dynamic_host(this->ike_sa, TRUE),
915 get_dynamic_host(this->ike_sa, FALSE));
916 if (this->config)
917 {
918 this->tsi = select_ts(this, FALSE, tsi);
919 this->tsr = select_ts(this, TRUE, tsr);
920 }
921 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
922 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
923 if (!this->config || !this->tsi || !this->tsr)
924 {
925 DBG1(DBG_IKE, "no matching CHILD_SA config found");
926 return send_notify(this, INVALID_ID_INFORMATION);
927 }
928
929 if (this->config->use_ipcomp(this->config))
930 {
931 if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
932 {
933 DBG1(DBG_IKE, "IPComp is not supported if either peer is "
934 "natted, IPComp disabled");
935 }
936 else
937 {
938 list = sa_payload->get_ipcomp_proposals(sa_payload,
939 &this->cpi_i);
940 if (!list->get_count(list))
941 {
942 DBG1(DBG_IKE, "expected IPComp proposal but peer did "
943 "not send one, IPComp disabled");
944 this->cpi_i = 0;
945 }
946 }
947 }
948 if (!list || !list->get_count(list))
949 {
950 DESTROY_IF(list);
951 list = sa_payload->get_proposals(sa_payload);
952 }
953 private = this->ike_sa->supports_extension(this->ike_sa,
954 EXT_STRONGSWAN);
955 this->proposal = this->config->select_proposal(this->config,
956 list, FALSE, private);
957 list->destroy_offset(list, offsetof(proposal_t, destroy));
958
959 get_lifetimes(this);
960 apply_lifetimes(this, sa_payload);
961
962 if (!this->proposal)
963 {
964 DBG1(DBG_IKE, "no matching proposal found, sending %N",
965 notify_type_names, NO_PROPOSAL_CHOSEN);
966 return send_notify(this, NO_PROPOSAL_CHOSEN);
967 }
968 this->spi_i = this->proposal->get_spi(this->proposal);
969
970 if (!get_nonce(this, &this->nonce_i, message))
971 {
972 return send_notify(this, INVALID_PAYLOAD_TYPE);
973 }
974
975 if (this->proposal->get_algorithm(this->proposal,
976 DIFFIE_HELLMAN_GROUP, &group, NULL))
977 {
978 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
979 group);
980 if (!this->dh)
981 {
982 DBG1(DBG_IKE, "negotiated DH group %N not supported",
983 diffie_hellman_group_names, group);
984 return send_notify(this, INVALID_KEY_INFORMATION);
985 }
986 if (!get_ke(this, message))
987 {
988 return send_notify(this, INVALID_PAYLOAD_TYPE);
989 }
990 }
991
992 check_for_rekeyed_child(this);
993
994 this->child_sa = child_sa_create(
995 this->ike_sa->get_my_host(this->ike_sa),
996 this->ike_sa->get_other_host(this->ike_sa),
997 this->config, this->reqid, this->udp);
998
999 tsi = linked_list_create_with_items(this->tsi, NULL);
1000 tsr = linked_list_create_with_items(this->tsr, NULL);
1001 this->tsi = this->tsr = NULL;
1002 charon->bus->narrow(charon->bus, this->child_sa,
1003 NARROW_RESPONDER, tsr, tsi);
1004 if (tsi->remove_first(tsi, (void**)&this->tsi) != SUCCESS ||
1005 tsr->remove_first(tsr, (void**)&this->tsr) != SUCCESS)
1006 {
1007 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
1008 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
1009 return send_notify(this, INVALID_ID_INFORMATION);
1010 }
1011 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
1012 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
1013
1014 return NEED_MORE;
1015 }
1016 case QM_NEGOTIATED:
1017 {
1018 if (message->get_exchange_type(message) == INFORMATIONAL_V1 ||
1019 has_notify_errors(this, message))
1020 {
1021 return SUCCESS;
1022 }
1023 if (!install(this))
1024 {
1025 ike_sa_t *ike_sa = this->ike_sa;
1026 task_t *task;
1027
1028 task = (task_t*)quick_delete_create(this->ike_sa,
1029 this->proposal->get_protocol(this->proposal),
1030 this->spi_i, TRUE, TRUE);
1031 /* flush_queue() destroys the current task */
1032 ike_sa->flush_queue(ike_sa, TASK_QUEUE_PASSIVE);
1033 ike_sa->queue_task(ike_sa, task);
1034 return ALREADY_DONE;
1035 }
1036 return SUCCESS;
1037 }
1038 default:
1039 return FAILED;
1040 }
1041 }
1042
1043 METHOD(task_t, build_r, status_t,
1044 private_quick_mode_t *this, message_t *message)
1045 {
1046 switch (this->state)
1047 {
1048 case QM_INIT:
1049 {
1050 sa_payload_t *sa_payload;
1051
1052 this->spi_r = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
1053 if (!this->spi_r)
1054 {
1055 DBG1(DBG_IKE, "allocating SPI from kernel failed");
1056 return send_notify(this, NO_PROPOSAL_CHOSEN);
1057 }
1058 this->proposal->set_spi(this->proposal, this->spi_r);
1059
1060 if (this->cpi_i)
1061 {
1062 this->cpi_r = this->child_sa->alloc_cpi(this->child_sa);
1063 if (!this->cpi_r)
1064 {
1065 DBG1(DBG_IKE, "unable to allocate a CPI from "
1066 "kernel, IPComp disabled");
1067 return send_notify(this, NO_PROPOSAL_CHOSEN);
1068 }
1069 }
1070
1071 if (this->udp && this->mode == MODE_TRANSPORT)
1072 {
1073 /* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
1074 add_nat_oa_payloads(this, message);
1075 }
1076
1077 sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
1078 this->lifetime, this->lifebytes, AUTH_NONE,
1079 this->mode, this->udp, this->cpi_r);
1080 message->add_payload(message, &sa_payload->payload_interface);
1081
1082 if (!add_nonce(this, &this->nonce_r, message))
1083 {
1084 return FAILED;
1085 }
1086 if (this->dh)
1087 {
1088 add_ke(this, message);
1089 }
1090
1091 add_ts(this, message);
1092
1093 this->state = QM_NEGOTIATED;
1094 return NEED_MORE;
1095 }
1096 default:
1097 return FAILED;
1098 }
1099 }
1100
1101 METHOD(task_t, process_i, status_t,
1102 private_quick_mode_t *this, message_t *message)
1103 {
1104 switch (this->state)
1105 {
1106 case QM_INIT:
1107 {
1108 sa_payload_t *sa_payload;
1109 linked_list_t *list = NULL;
1110 bool private;
1111
1112 sa_payload = (sa_payload_t*)message->get_payload(message,
1113 SECURITY_ASSOCIATION_V1);
1114 if (!sa_payload)
1115 {
1116 DBG1(DBG_IKE, "sa payload missing");
1117 return send_notify(this, NO_PROPOSAL_CHOSEN);
1118 }
1119 if (this->cpi_i)
1120 {
1121 list = sa_payload->get_ipcomp_proposals(sa_payload,
1122 &this->cpi_r);
1123 if (!list->get_count(list))
1124 {
1125 DBG1(DBG_IKE, "peer did not acccept our IPComp proposal, "
1126 "IPComp disabled");
1127 this->cpi_i = 0;
1128 }
1129 }
1130 if (!list || !list->get_count(list))
1131 {
1132 DESTROY_IF(list);
1133 list = sa_payload->get_proposals(sa_payload);
1134 }
1135 private = this->ike_sa->supports_extension(this->ike_sa,
1136 EXT_STRONGSWAN);
1137 this->proposal = this->config->select_proposal(this->config,
1138 list, FALSE, private);
1139 list->destroy_offset(list, offsetof(proposal_t, destroy));
1140 if (!this->proposal)
1141 {
1142 DBG1(DBG_IKE, "no matching proposal found");
1143 return send_notify(this, NO_PROPOSAL_CHOSEN);
1144 }
1145 this->spi_r = this->proposal->get_spi(this->proposal);
1146
1147 apply_lifetimes(this, sa_payload);
1148
1149 if (!get_nonce(this, &this->nonce_r, message))
1150 {
1151 return send_notify(this, INVALID_PAYLOAD_TYPE);
1152 }
1153 if (this->dh && !get_ke(this, message))
1154 {
1155 return send_notify(this, INVALID_KEY_INFORMATION);
1156 }
1157 if (!get_ts(this, message))
1158 {
1159 return send_notify(this, INVALID_PAYLOAD_TYPE);
1160 }
1161 if (!install(this))
1162 {
1163 return send_notify(this, NO_PROPOSAL_CHOSEN);
1164 }
1165 this->state = QM_NEGOTIATED;
1166 return NEED_MORE;
1167 }
1168 default:
1169 return FAILED;
1170 }
1171 }
1172
1173 METHOD(task_t, get_type, task_type_t,
1174 private_quick_mode_t *this)
1175 {
1176 return TASK_QUICK_MODE;
1177 }
1178
1179 METHOD(quick_mode_t, use_reqid, void,
1180 private_quick_mode_t *this, u_int32_t reqid)
1181 {
1182 this->reqid = reqid;
1183 }
1184
1185 METHOD(quick_mode_t, rekey, void,
1186 private_quick_mode_t *this, u_int32_t spi)
1187 {
1188 this->rekey = spi;
1189 }
1190
1191 METHOD(task_t, migrate, void,
1192 private_quick_mode_t *this, ike_sa_t *ike_sa)
1193 {
1194 chunk_free(&this->nonce_i);
1195 chunk_free(&this->nonce_r);
1196 DESTROY_IF(this->tsi);
1197 DESTROY_IF(this->tsr);
1198 DESTROY_IF(this->proposal);
1199 DESTROY_IF(this->child_sa);
1200 DESTROY_IF(this->dh);
1201
1202 this->ike_sa = ike_sa;
1203 this->keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa);
1204 this->state = QM_INIT;
1205 this->tsi = NULL;
1206 this->tsr = NULL;
1207 this->proposal = NULL;
1208 this->child_sa = NULL;
1209 this->dh = NULL;
1210 this->spi_i = 0;
1211 this->spi_r = 0;
1212
1213 if (!this->initiator)
1214 {
1215 DESTROY_IF(this->config);
1216 this->config = NULL;
1217 }
1218 }
1219
1220 METHOD(task_t, destroy, void,
1221 private_quick_mode_t *this)
1222 {
1223 chunk_free(&this->nonce_i);
1224 chunk_free(&this->nonce_r);
1225 DESTROY_IF(this->tsi);
1226 DESTROY_IF(this->tsr);
1227 DESTROY_IF(this->proposal);
1228 DESTROY_IF(this->child_sa);
1229 DESTROY_IF(this->config);
1230 DESTROY_IF(this->dh);
1231 free(this);
1232 }
1233
1234 /*
1235 * Described in header.
1236 */
1237 quick_mode_t *quick_mode_create(ike_sa_t *ike_sa, child_cfg_t *config,
1238 traffic_selector_t *tsi, traffic_selector_t *tsr)
1239 {
1240 private_quick_mode_t *this;
1241
1242 INIT(this,
1243 .public = {
1244 .task = {
1245 .get_type = _get_type,
1246 .migrate = _migrate,
1247 .destroy = _destroy,
1248 },
1249 .use_reqid = _use_reqid,
1250 .rekey = _rekey,
1251 },
1252 .ike_sa = ike_sa,
1253 .initiator = config != NULL,
1254 .config = config,
1255 .keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa),
1256 .state = QM_INIT,
1257 .tsi = tsi ? tsi->clone(tsi) : NULL,
1258 .tsr = tsr ? tsr->clone(tsr) : NULL,
1259 );
1260
1261 if (config)
1262 {
1263 this->public.task.build = _build_i;
1264 this->public.task.process = _process_i;
1265 }
1266 else
1267 {
1268 this->public.task.build = _build_r;
1269 this->public.task.process = _process_r;
1270 }
1271
1272 return &this->public;
1273 }