Don't complain about multiple TS in IKEv1, as it supported with Unity
[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 hosts to use for dynamic traffic selectors
202 */
203 static linked_list_t *get_dynamic_hosts(ike_sa_t *ike_sa, bool local)
204 {
205 enumerator_t *enumerator;
206 linked_list_t *list;
207 host_t *host;
208
209 list = linked_list_create();
210 enumerator = ike_sa->create_virtual_ip_enumerator(ike_sa, local);
211 while (enumerator->enumerate(enumerator, &host))
212 {
213 list->insert_last(list, host);
214 }
215 enumerator->destroy(enumerator);
216
217 if (list->get_count(list) == 0)
218 { /* no virtual IPs assigned */
219 if (local)
220 {
221 host = ike_sa->get_my_host(ike_sa);
222 list->insert_last(list, host);
223 }
224 else if (!have_pool(ike_sa))
225 { /* use host only if we don't have a pool configured */
226 host = ike_sa->get_other_host(ike_sa);
227 list->insert_last(list, host);
228 }
229 }
230 return list;
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, *hosts;
456
457 hosts = get_dynamic_hosts(this->ike_sa, local);
458 list = this->config->get_traffic_selectors(this->config,
459 local, supplied, hosts);
460 hosts->destroy(hosts);
461 if (list->get_first(list, (void**)&ts) == SUCCESS)
462 {
463 ts = ts->clone(ts);
464 }
465 else
466 {
467 DBG1(DBG_IKE, "%s traffic selector missing in configuration",
468 local ? "local" : "local");
469 ts = NULL;
470 }
471 list->destroy_offset(list, offsetof(traffic_selector_t, destroy));
472 return ts;
473 }
474
475 /**
476 * Add selected traffic selectors to message
477 */
478 static void add_ts(private_quick_mode_t *this, message_t *message)
479 {
480 id_payload_t *id_payload;
481 host_t *hsi, *hsr;
482
483 if (this->initiator)
484 {
485 hsi = this->ike_sa->get_my_host(this->ike_sa);
486 hsr = this->ike_sa->get_other_host(this->ike_sa);
487 }
488 else
489 {
490 hsr = this->ike_sa->get_my_host(this->ike_sa);
491 hsi = this->ike_sa->get_other_host(this->ike_sa);
492 }
493 /* add ID payload only if negotiating non host2host tunnels */
494 if (!this->tsi->is_host(this->tsi, hsi) ||
495 !this->tsr->is_host(this->tsr, hsr) ||
496 this->tsi->get_protocol(this->tsi) ||
497 this->tsr->get_protocol(this->tsr) ||
498 this->tsi->get_from_port(this->tsi) ||
499 this->tsr->get_from_port(this->tsr) ||
500 this->tsi->get_to_port(this->tsi) != 65535 ||
501 this->tsr->get_to_port(this->tsr) != 65535)
502 {
503 id_payload = id_payload_create_from_ts(this->tsi);
504 message->add_payload(message, &id_payload->payload_interface);
505 id_payload = id_payload_create_from_ts(this->tsr);
506 message->add_payload(message, &id_payload->payload_interface);
507 }
508 }
509
510 /**
511 * Get traffic selectors from received message
512 */
513 static bool get_ts(private_quick_mode_t *this, message_t *message)
514 {
515 traffic_selector_t *tsi = NULL, *tsr = NULL;
516 enumerator_t *enumerator;
517 id_payload_t *id_payload;
518 payload_t *payload;
519 host_t *hsi, *hsr;
520 bool first = TRUE;
521
522 enumerator = message->create_payload_enumerator(message);
523 while (enumerator->enumerate(enumerator, &payload))
524 {
525 if (payload->get_type(payload) == ID_V1)
526 {
527 id_payload = (id_payload_t*)payload;
528
529 if (first)
530 {
531 tsi = id_payload->get_ts(id_payload);
532 first = FALSE;
533 }
534 else
535 {
536 tsr = id_payload->get_ts(id_payload);
537 break;
538 }
539 }
540 }
541 enumerator->destroy(enumerator);
542
543 /* create host2host selectors if ID payloads missing */
544 if (this->initiator)
545 {
546 hsi = this->ike_sa->get_my_host(this->ike_sa);
547 hsr = this->ike_sa->get_other_host(this->ike_sa);
548 }
549 else
550 {
551 hsr = this->ike_sa->get_my_host(this->ike_sa);
552 hsi = this->ike_sa->get_other_host(this->ike_sa);
553 }
554 if (!tsi)
555 {
556 tsi = traffic_selector_create_from_subnet(hsi->clone(hsi),
557 hsi->get_family(hsi) == AF_INET ? 32 : 128, 0, 0);
558 }
559 if (!tsr)
560 {
561 tsr = traffic_selector_create_from_subnet(hsr->clone(hsr),
562 hsr->get_family(hsr) == AF_INET ? 32 : 128, 0, 0);
563 }
564 if (!this->initiator && this->mode == MODE_TRANSPORT && this->udp &&
565 (!tsi->is_host(tsi, hsi) || !tsr->is_host(tsr, hsr)))
566 { /* change TS in case of a NAT in transport mode */
567 DBG2(DBG_IKE, "changing received traffic selectors %R=== %R due to NAT",
568 tsi, tsr);
569 tsi->set_address(tsi, hsi);
570 tsr->set_address(tsr, hsr);
571 }
572
573 if (this->initiator)
574 {
575 /* check if peer selection valid */
576 if (!tsr->is_contained_in(tsr, this->tsr) ||
577 !tsi->is_contained_in(tsi, this->tsi))
578 {
579 DBG1(DBG_IKE, "peer selected invalid traffic selectors: ",
580 "%R for %R, %R for %R", tsi, this->tsi, tsr, this->tsr);
581 tsi->destroy(tsi);
582 tsr->destroy(tsr);
583 return FALSE;
584 }
585 this->tsi->destroy(this->tsi);
586 this->tsr->destroy(this->tsr);
587 this->tsi = tsi;
588 this->tsr = tsr;
589 }
590 else
591 {
592 this->tsi = tsi;
593 this->tsr = tsr;
594 }
595 return TRUE;
596 }
597
598 /**
599 * Add NAT-OA payloads
600 */
601 static void add_nat_oa_payloads(private_quick_mode_t *this, message_t *message)
602 {
603 identification_t *id;
604 id_payload_t *nat_oa;
605 host_t *src, *dst;
606
607 src = message->get_source(message);
608 dst = message->get_destination(message);
609
610 src = this->initiator ? src : dst;
611 dst = this->initiator ? dst : src;
612
613 /* first NAT-OA is the initiator's address */
614 id = identification_create_from_sockaddr(src->get_sockaddr(src));
615 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
616 message->add_payload(message, (payload_t*)nat_oa);
617 id->destroy(id);
618
619 /* second NAT-OA is that of the responder */
620 id = identification_create_from_sockaddr(dst->get_sockaddr(dst));
621 nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
622 message->add_payload(message, (payload_t*)nat_oa);
623 id->destroy(id);
624 }
625
626 /**
627 * Look up lifetimes
628 */
629 static void get_lifetimes(private_quick_mode_t *this)
630 {
631 lifetime_cfg_t *lft;
632
633 lft = this->config->get_lifetime(this->config);
634 if (lft->time.life)
635 {
636 this->lifetime = lft->time.life;
637 }
638 else if (lft->bytes.life)
639 {
640 this->lifebytes = lft->bytes.life;
641 }
642 free(lft);
643 }
644
645 /**
646 * Check and apply lifetimes
647 */
648 static void apply_lifetimes(private_quick_mode_t *this, sa_payload_t *sa_payload)
649 {
650 u_int32_t lifetime;
651 u_int64_t lifebytes;
652
653 lifetime = sa_payload->get_lifetime(sa_payload);
654 lifebytes = sa_payload->get_lifebytes(sa_payload);
655 if (this->lifetime != lifetime)
656 {
657 DBG1(DBG_IKE, "received %us lifetime, configured %us",
658 lifetime, this->lifetime);
659 this->lifetime = lifetime;
660 }
661 if (this->lifebytes != lifebytes)
662 {
663 DBG1(DBG_IKE, "received %llu lifebytes, configured %llu",
664 lifebytes, this->lifebytes);
665 this->lifebytes = lifebytes;
666 }
667 }
668
669 /**
670 * Set the task ready to build notify error message
671 */
672 static status_t send_notify(private_quick_mode_t *this, notify_type_t type)
673 {
674 notify_payload_t *notify;
675
676 notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
677 PROTO_ESP, type);
678 notify->set_spi(notify, this->spi_i);
679
680 this->ike_sa->queue_task(this->ike_sa,
681 (task_t*)informational_create(this->ike_sa, notify));
682 /* cancel all active/passive tasks in favour of informational */
683 this->ike_sa->flush_queue(this->ike_sa,
684 this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
685 return ALREADY_DONE;
686 }
687
688 METHOD(task_t, build_i, status_t,
689 private_quick_mode_t *this, message_t *message)
690 {
691 switch (this->state)
692 {
693 case QM_INIT:
694 {
695 enumerator_t *enumerator;
696 sa_payload_t *sa_payload;
697 linked_list_t *list, *tsi, *tsr;
698 proposal_t *proposal;
699 diffie_hellman_group_t group;
700
701 this->udp = this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY);
702 this->mode = this->config->get_mode(this->config);
703 this->child_sa = child_sa_create(
704 this->ike_sa->get_my_host(this->ike_sa),
705 this->ike_sa->get_other_host(this->ike_sa),
706 this->config, this->reqid, this->udp);
707
708 if (this->udp && this->mode == MODE_TRANSPORT)
709 {
710 /* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
711 add_nat_oa_payloads(this, message);
712 }
713
714 if (this->config->use_ipcomp(this->config))
715 {
716 if (this->udp)
717 {
718 DBG1(DBG_IKE, "IPComp is not supported if either peer is "
719 "natted, IPComp disabled");
720 }
721 else
722 {
723 this->cpi_i = this->child_sa->alloc_cpi(this->child_sa);
724 if (!this->cpi_i)
725 {
726 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, "
727 "IPComp disabled");
728 }
729 }
730 }
731
732 this->spi_i = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
733 if (!this->spi_i)
734 {
735 DBG1(DBG_IKE, "allocating SPI from kernel failed");
736 return FAILED;
737 }
738
739 list = this->config->get_proposals(this->config, FALSE);
740 enumerator = list->create_enumerator(list);
741 while (enumerator->enumerate(enumerator, &proposal))
742 {
743 proposal->set_spi(proposal, this->spi_i);
744 }
745 enumerator->destroy(enumerator);
746
747 get_lifetimes(this);
748 sa_payload = sa_payload_create_from_proposals_v1(list,
749 this->lifetime, this->lifebytes, AUTH_NONE,
750 this->mode, this->udp, this->cpi_i);
751 list->destroy_offset(list, offsetof(proposal_t, destroy));
752 message->add_payload(message, &sa_payload->payload_interface);
753
754 if (!add_nonce(this, &this->nonce_i, message))
755 {
756 return FAILED;
757 }
758
759 group = this->config->get_dh_group(this->config);
760 if (group != MODP_NONE)
761 {
762 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
763 group);
764 if (!this->dh)
765 {
766 DBG1(DBG_IKE, "configured DH group %N not supported",
767 diffie_hellman_group_names, group);
768 return FAILED;
769 }
770 add_ke(this, message);
771 }
772 if (!this->tsi)
773 {
774 this->tsi = select_ts(this, TRUE, NULL);
775 }
776 if (!this->tsr)
777 {
778 this->tsr = select_ts(this, FALSE, NULL);
779 }
780 tsi = linked_list_create_with_items(this->tsi, NULL);
781 tsr = linked_list_create_with_items(this->tsr, NULL);
782 this->tsi = this->tsr = NULL;
783 charon->bus->narrow(charon->bus, this->child_sa,
784 NARROW_INITIATOR_PRE_AUTH, tsi, tsr);
785 tsi->remove_first(tsi, (void**)&this->tsi);
786 tsr->remove_first(tsr, (void**)&this->tsr);
787 tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
788 tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
789 if (!this->tsi || !this->tsr)
790 {
791 return FAILED;
792 }
793 add_ts(this, message);
794 return NEED_MORE;
795 }
796 case QM_NEGOTIATED:
797 {
798 return SUCCESS;
799 }
800 default:
801 return FAILED;
802 }
803 }
804
805 /**
806 * Check for notify errors, return TRUE if error found
807 */
808 static bool has_notify_errors(private_quick_mode_t *this, message_t *message)
809 {
810 enumerator_t *enumerator;
811 payload_t *payload;
812 bool err = FALSE;
813
814 enumerator = message->create_payload_enumerator(message);
815 while (enumerator->enumerate(enumerator, &payload))
816 {
817 if (payload->get_type(payload) == NOTIFY_V1)
818 {
819 notify_payload_t *notify;
820 notify_type_t type;
821
822 notify = (notify_payload_t*)payload;
823 type = notify->get_notify_type(notify);
824 if (type < 16384)
825 {
826
827 DBG1(DBG_IKE, "received %N error notify",
828 notify_type_names, type);
829 err = TRUE;
830 }
831 else
832 {
833 DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
834 }
835 }
836 }
837 enumerator->destroy(enumerator);
838
839 return err;
840 }
841
842 /**
843 * Check if this is a rekey for an existing CHILD_SA, reuse reqid if so
844 */
845 static void check_for_rekeyed_child(private_quick_mode_t *this)
846 {
847 enumerator_t *enumerator, *policies;
848 traffic_selector_t *local, *remote;
849 child_sa_t *child_sa;
850
851 enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
852 while (this->reqid == 0 && enumerator->enumerate(enumerator, &child_sa))
853 {
854 if (child_sa->get_state(child_sa) == CHILD_INSTALLED &&
855 streq(child_sa->get_name(child_sa),
856 this->config->get_name(this->config)))
857 {
858 policies = child_sa->create_policy_enumerator(child_sa);
859 if (policies->enumerate(policies, &local, &remote))
860 {
861 if (local->equals(local, this->tsr) &&
862 remote->equals(remote, this->tsi) &&
863 this->proposal->equals(this->proposal,
864 child_sa->get_proposal(child_sa)))
865 {
866 this->reqid = child_sa->get_reqid(child_sa);
867 this->rekey = child_sa->get_spi(child_sa, TRUE);
868 child_sa->set_state(child_sa, CHILD_REKEYING);
869 DBG1(DBG_IKE, "detected rekeying of CHILD_SA %s{%u}",
870 child_sa->get_name(child_sa), this->reqid);
871 }
872 }
873 policies->destroy(policies);
874 }
875 }
876 enumerator->destroy(enumerator);
877 }
878
879 METHOD(task_t, process_r, status_t,
880 private_quick_mode_t *this, message_t *message)
881 {
882 switch (this->state)
883 {
884 case QM_INIT:
885 {
886 sa_payload_t *sa_payload;
887 linked_list_t *tsi, *tsr, *hostsi, *hostsr, *list = NULL;
888 peer_cfg_t *peer_cfg;
889 u_int16_t group;
890 bool private;
891
892 sa_payload = (sa_payload_t*)message->get_payload(message,
893 SECURITY_ASSOCIATION_V1);
894 if (!sa_payload)
895 {
896 DBG1(DBG_IKE, "sa payload missing");
897 return send_notify(this, INVALID_PAYLOAD_TYPE);
898 }
899
900 this->mode = sa_payload->get_encap_mode(sa_payload, &this->udp);
901
902 if (!get_ts(this, message))
903 {
904 return FAILED;
905 }
906 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
907 tsi = linked_list_create_with_items(this->tsi, NULL);
908 tsr = linked_list_create_with_items(this->tsr, NULL);
909 this->tsi = this->tsr = NULL;
910 hostsi = get_dynamic_hosts(this->ike_sa, FALSE);
911 hostsr = get_dynamic_hosts(this->ike_sa, TRUE);
912 this->config = peer_cfg->select_child_cfg(peer_cfg, tsr, tsi,
913 hostsr, hostsi);
914 hostsi->destroy(hostsi);
915 hostsr->destroy(hostsr);
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 }