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[strongswan.git] / src / charon / sa / ike_sa.c
1 /**
2 * @file ike_sa.c
3 *
4 * @brief Implementation of ike_sa_t.
5 *
6 */
7
8 /*
9 * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
10 * Copyright (C) 2005-2006 Martin Willi
11 * Copyright (C) 2005 Jan Hutter
12 * Hochschule fuer Technik Rapperswil
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
21 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * for more details.
23 */
24
25 #include <sys/time.h>
26 #include <string.h>
27 #include <printf.h>
28 #include <sys/stat.h>
29
30 #include "ike_sa.h"
31
32 #include <library.h>
33 #include <daemon.h>
34 #include <utils/linked_list.h>
35 #include <utils/lexparser.h>
36 #include <crypto/diffie_hellman.h>
37 #include <crypto/prf_plus.h>
38 #include <crypto/crypters/crypter.h>
39 #include <crypto/hashers/hasher.h>
40 #include <encoding/payloads/sa_payload.h>
41 #include <encoding/payloads/nonce_payload.h>
42 #include <encoding/payloads/ke_payload.h>
43 #include <encoding/payloads/delete_payload.h>
44 #include <encoding/payloads/transform_substructure.h>
45 #include <encoding/payloads/transform_attribute.h>
46 #include <encoding/payloads/ts_payload.h>
47 #include <sa/task_manager.h>
48 #include <sa/tasks/ike_init.h>
49 #include <sa/tasks/ike_natd.h>
50 #include <sa/tasks/ike_auth.h>
51 #include <sa/tasks/ike_config.h>
52 #include <sa/tasks/ike_cert.h>
53 #include <sa/tasks/ike_rekey.h>
54 #include <sa/tasks/ike_delete.h>
55 #include <sa/tasks/ike_dpd.h>
56 #include <sa/tasks/child_create.h>
57 #include <sa/tasks/child_delete.h>
58 #include <sa/tasks/child_rekey.h>
59 #include <queues/jobs/retransmit_job.h>
60 #include <queues/jobs/delete_ike_sa_job.h>
61 #include <queues/jobs/send_dpd_job.h>
62 #include <queues/jobs/send_keepalive_job.h>
63 #include <queues/jobs/rekey_ike_sa_job.h>
64 #include <queues/jobs/route_job.h>
65 #include <queues/jobs/initiate_job.h>
66
67
68 #ifndef RESOLV_CONF
69 #define RESOLV_CONF "/etc/resolv.conf"
70 #endif
71
72 ENUM(ike_sa_state_names, IKE_CREATED, IKE_DELETING,
73 "CREATED",
74 "CONNECTING",
75 "ESTABLISHED",
76 "REKEYING",
77 "DELETING",
78 );
79
80 typedef struct private_ike_sa_t private_ike_sa_t;
81
82 /**
83 * Private data of an ike_sa_t object.
84 */
85 struct private_ike_sa_t {
86
87 /**
88 * Public members
89 */
90 ike_sa_t public;
91
92 /**
93 * Identifier for the current IKE_SA.
94 */
95 ike_sa_id_t *ike_sa_id;
96
97 /**
98 * unique numerical ID for this IKE_SA.
99 */
100 u_int32_t unique_id;
101
102 /**
103 * Current state of the IKE_SA
104 */
105 ike_sa_state_t state;
106
107 /**
108 * connection used to establish this IKE_SA.
109 */
110 connection_t *connection;
111
112 /**
113 * Peer and authentication information to establish IKE_SA.
114 */
115 policy_t *policy;
116
117 /**
118 * Juggles tasks to process messages
119 */
120 task_manager_t *task_manager;
121
122 /**
123 * Address of local host
124 */
125 host_t *my_host;
126
127 /**
128 * Address of remote host
129 */
130 host_t *other_host;
131
132 /**
133 * Identification used for us
134 */
135 identification_t *my_id;
136
137 /**
138 * Identification used for other
139 */
140 identification_t *other_id;
141
142 /**
143 * Linked List containing the child sa's of the current IKE_SA.
144 */
145 linked_list_t *child_sas;
146
147 /**
148 * crypter for inbound traffic
149 */
150 crypter_t *crypter_in;
151
152 /**
153 * crypter for outbound traffic
154 */
155 crypter_t *crypter_out;
156
157 /**
158 * Signer for inbound traffic
159 */
160 signer_t *signer_in;
161
162 /**
163 * Signer for outbound traffic
164 */
165 signer_t *signer_out;
166
167 /**
168 * Multi purpose prf, set key, use it, forget it
169 */
170 prf_t *prf;
171
172 /**
173 * Prf function for derivating keymat child SAs
174 */
175 prf_t *child_prf;
176
177 /**
178 * PRF to build outging authentication data
179 */
180 prf_t *auth_build;
181
182 /**
183 * PRF to verify incoming authentication data
184 */
185 prf_t *auth_verify;
186
187 /**
188 * NAT status of local host.
189 */
190 bool nat_here;
191
192 /**
193 * NAT status of remote host.
194 */
195 bool nat_there;
196
197 /**
198 * Virtual IP on local host, if any
199 */
200 host_t *my_virtual_ip;
201
202 /**
203 * Virtual IP on remote host, if any
204 */
205 host_t *other_virtual_ip;
206
207 /**
208 * List of DNS servers installed by us
209 */
210 linked_list_t *dns_servers;
211
212 /**
213 * Timestamps for this IKE_SA
214 */
215 struct {
216 /** last IKE message received */
217 u_int32_t inbound;
218 /** last IKE message sent */
219 u_int32_t outbound;
220 /** when IKE_SA became established */
221 u_int32_t established;
222 /** when IKE_SA gets rekeyed */
223 u_int32_t rekey;
224 /** when IKE_SA gets deleted */
225 u_int32_t delete;
226 } time;
227
228 /**
229 * how many times we have retried so far (keyingtries)
230 */
231 u_int32_t keyingtry;
232 };
233
234 /**
235 * get the time of the latest traffic processed by the kernel
236 */
237 static time_t get_use_time(private_ike_sa_t* this, bool inbound)
238 {
239 iterator_t *iterator;
240 child_sa_t *child_sa;
241 time_t latest = 0, use_time;
242
243 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
244 while (iterator->iterate(iterator, (void**)&child_sa))
245 {
246 if (child_sa->get_use_time(child_sa, inbound, &use_time) == SUCCESS)
247 {
248 latest = max(latest, use_time);
249 }
250 }
251 iterator->destroy(iterator);
252
253 if (inbound)
254 {
255 return max(this->time.inbound, latest);
256 }
257 else
258 {
259 return max(this->time.outbound, latest);
260 }
261 }
262
263 /**
264 * Implementation of ike_sa_t.get_unique_id
265 */
266 static u_int32_t get_unique_id(private_ike_sa_t *this)
267 {
268 return this->unique_id;
269 }
270
271 /**
272 * Implementation of ike_sa_t.get_name.
273 */
274 static char *get_name(private_ike_sa_t *this)
275 {
276 if (this->connection)
277 {
278 return this->connection->get_name(this->connection);
279 }
280 return "(unnamed)";
281 }
282
283 /**
284 * Implementation of ike_sa_t.get_connection
285 */
286 static connection_t* get_connection(private_ike_sa_t *this)
287 {
288 return this->connection;
289 }
290
291 /**
292 * Implementation of ike_sa_t.set_connection
293 */
294 static void set_connection(private_ike_sa_t *this, connection_t *connection)
295 {
296 this->connection = connection;
297 connection->get_ref(connection);
298 }
299
300 /**
301 * Implementation of ike_sa_t.get_policy
302 */
303 static policy_t *get_policy(private_ike_sa_t *this)
304 {
305 return this->policy;
306 }
307
308 /**
309 * Implementation of ike_sa_t.set_policy
310 */
311 static void set_policy(private_ike_sa_t *this, policy_t *policy)
312 {
313 policy->get_ref(policy);
314 this->policy = policy;
315 }
316
317 /**
318 * Implementation of ike_sa_t.get_my_host.
319 */
320 static host_t *get_my_host(private_ike_sa_t *this)
321 {
322 return this->my_host;
323 }
324
325 /**
326 * Implementation of ike_sa_t.set_my_host.
327 */
328 static void set_my_host(private_ike_sa_t *this, host_t *me)
329 {
330 DESTROY_IF(this->my_host);
331 this->my_host = me;
332 }
333
334 /**
335 * Implementation of ike_sa_t.get_other_host.
336 */
337 static host_t *get_other_host(private_ike_sa_t *this)
338 {
339 return this->other_host;
340 }
341
342 /**
343 * Implementation of ike_sa_t.set_other_host.
344 */
345 static void set_other_host(private_ike_sa_t *this, host_t *other)
346 {
347 DESTROY_IF(this->other_host);
348 this->other_host = other;
349 }
350
351 /**
352 * Implementation of ike_sa_t.send_dpd
353 */
354 static status_t send_dpd(private_ike_sa_t *this)
355 {
356 send_dpd_job_t *job;
357 time_t diff, delay;
358
359 delay = this->connection->get_dpd_delay(this->connection);
360
361 if (delay == 0)
362 {
363 /* DPD disabled */
364 return SUCCESS;
365 }
366
367 if (this->task_manager->busy(this->task_manager))
368 {
369 /* an exchange is in the air, no need to start a DPD check */
370 diff = 0;
371 }
372 else
373 {
374 /* check if there was any inbound traffic */
375 time_t last_in, now;
376 last_in = get_use_time(this, TRUE);
377 now = time(NULL);
378 diff = now - last_in;
379 if (diff >= delay)
380 {
381 /* to long ago, initiate dead peer detection */
382 task_t *task;
383
384 task = (task_t*)ike_dpd_create(TRUE);
385 diff = 0;
386 DBG1(DBG_IKE, "sending DPD request");
387
388 this->task_manager->queue_task(this->task_manager, task);
389 this->task_manager->initiate(this->task_manager);
390 }
391 }
392 /* recheck in "interval" seconds */
393 job = send_dpd_job_create(this->ike_sa_id);
394 charon->event_queue->add_relative(charon->event_queue, (job_t*)job,
395 (delay - diff) * 1000);
396 return SUCCESS;
397 }
398
399 /**
400 * Implementation of ike_sa_t.send_keepalive
401 */
402 static void send_keepalive(private_ike_sa_t *this)
403 {
404 send_keepalive_job_t *job;
405 time_t last_out, now, diff, interval;
406
407 last_out = get_use_time(this, FALSE);
408 now = time(NULL);
409
410 diff = now - last_out;
411 interval = charon->configuration->get_keepalive_interval(charon->configuration);
412
413 if (diff >= interval)
414 {
415 packet_t *packet;
416 chunk_t data;
417
418 packet = packet_create();
419 packet->set_source(packet, this->my_host->clone(this->my_host));
420 packet->set_destination(packet, this->other_host->clone(this->other_host));
421 data.ptr = malloc(1);
422 data.ptr[0] = 0xFF;
423 data.len = 1;
424 packet->set_data(packet, data);
425 charon->send_queue->add(charon->send_queue, packet);
426 DBG1(DBG_IKE, "sending keep alive");
427 diff = 0;
428 }
429 job = send_keepalive_job_create(this->ike_sa_id);
430 charon->event_queue->add_relative(charon->event_queue, (job_t*)job,
431 (interval - diff) * 1000);
432 }
433
434 /**
435 * Implementation of ike_sa_t.get_state.
436 */
437 static ike_sa_state_t get_state(private_ike_sa_t *this)
438 {
439 return this->state;
440 }
441
442 /**
443 * Implementation of ike_sa_t.set_state.
444 */
445 static void set_state(private_ike_sa_t *this, ike_sa_state_t state)
446 {
447 DBG1(DBG_IKE, "IKE_SA state change: %N => %N",
448 ike_sa_state_names, this->state,
449 ike_sa_state_names, state);
450
451 switch (state)
452 {
453 case IKE_ESTABLISHED:
454 {
455 if (this->state == IKE_CONNECTING)
456 {
457 job_t *job;
458 u_int32_t now = time(NULL);
459 u_int32_t soft, hard;
460 bool reauth;
461
462 this->time.established = now;
463 /* start DPD checks */
464 send_dpd(this);
465
466 /* schedule rekeying/reauthentication */
467 soft = this->connection->get_soft_lifetime(this->connection);
468 hard = this->connection->get_hard_lifetime(this->connection);
469 reauth = this->connection->get_reauth(this->connection);
470 DBG1(DBG_IKE, "scheduling %s in %ds, maximum lifetime %ds",
471 reauth ? "reauthentication": "rekeying", soft, hard);
472
473 if (soft)
474 {
475 this->time.rekey = now + soft;
476 job = (job_t*)rekey_ike_sa_job_create(this->ike_sa_id, reauth);
477 charon->event_queue->add_relative(charon->event_queue, job,
478 soft * 1000);
479 }
480
481 if (hard)
482 {
483 this->time.delete = now + hard;
484 job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE);
485 charon->event_queue->add_relative(charon->event_queue, job,
486 hard * 1000);
487 }
488 }
489 break;
490 }
491 case IKE_DELETING:
492 {
493 /* delete may fail if a packet gets lost, so set a timeout */
494 job_t *job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE);
495 charon->event_queue->add_relative(charon->event_queue, job,
496 charon->configuration->get_half_open_ike_sa_timeout(
497 charon->configuration));
498 break;
499 }
500 default:
501 break;
502 }
503
504 this->state = state;
505 }
506
507 /**
508 * Implementation of ike_sa_t.reset
509 */
510 static void reset(private_ike_sa_t *this)
511 {
512 /* the responder ID is reset, as peer may choose another one */
513 if (this->ike_sa_id->is_initiator(this->ike_sa_id))
514 {
515 this->ike_sa_id->set_responder_spi(this->ike_sa_id, 0);
516 }
517
518 set_state(this, IKE_CREATED);
519
520 this->task_manager->reset(this->task_manager);
521 }
522
523 /**
524 * Update connection host, as addresses may change (NAT)
525 */
526 static void update_hosts(private_ike_sa_t *this, host_t *me, host_t *other)
527 {
528 iterator_t *iterator = NULL;
529 child_sa_t *child_sa = NULL;
530 host_diff_t my_diff, other_diff;
531
532 if (this->my_host->is_anyaddr(this->my_host) ||
533 this->other_host->is_anyaddr(this->other_host))
534 {
535 /* on first received message */
536 this->my_host->destroy(this->my_host);
537 this->my_host = me->clone(me);
538 this->other_host->destroy(this->other_host);
539 this->other_host = other->clone(other);
540 return;
541 }
542
543 my_diff = me->get_differences(me, this->my_host);
544 other_diff = other->get_differences(other, this->other_host);
545
546 if (!my_diff && !other_diff)
547 {
548 return;
549 }
550
551 if (my_diff)
552 {
553 this->my_host->destroy(this->my_host);
554 this->my_host = me->clone(me);
555 }
556
557 if (!this->nat_here)
558 {
559 /* update without restrictions if we are not NATted */
560 if (other_diff)
561 {
562 this->other_host->destroy(this->other_host);
563 this->other_host = other->clone(other);
564 }
565 }
566 else
567 {
568 /* if we are natted, only port may change */
569 if (other_diff & HOST_DIFF_ADDR)
570 {
571 return;
572 }
573 else if (other_diff & HOST_DIFF_PORT)
574 {
575 this->other_host->set_port(this->other_host, other->get_port(other));
576 }
577 }
578 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
579 while (iterator->iterate(iterator, (void**)&child_sa))
580 {
581 child_sa->update_hosts(child_sa, this->my_host, this->other_host,
582 my_diff, other_diff);
583 }
584 iterator->destroy(iterator);
585 }
586
587 /**
588 * Implementation of ike_sa_t.generate
589 */
590 static status_t generate_message(private_ike_sa_t *this, message_t *message,
591 packet_t **packet)
592 {
593 this->time.outbound = time(NULL);
594 message->set_ike_sa_id(message, this->ike_sa_id);
595 message->set_destination(message, this->other_host->clone(this->other_host));
596 message->set_source(message, this->my_host->clone(this->my_host));
597 return message->generate(message, this->crypter_out, this->signer_out, packet);
598 }
599
600 /**
601 * send a notify back to the sender
602 */
603 static void send_notify_response(private_ike_sa_t *this, message_t *request,
604 notify_type_t type)
605 {
606 message_t *response;
607 packet_t *packet;
608
609 response = message_create();
610 response->set_exchange_type(response, request->get_exchange_type(request));
611 response->set_request(response, FALSE);
612 response->set_message_id(response, request->get_message_id(request));
613 response->add_notify(response, FALSE, type, chunk_empty);
614 if (this->my_host->is_anyaddr(this->my_host))
615 {
616 this->my_host->destroy(this->my_host);
617 this->my_host = request->get_destination(request);
618 this->my_host = this->my_host->clone(this->my_host);
619 }
620 if (this->other_host->is_anyaddr(this->other_host))
621 {
622 this->other_host->destroy(this->other_host);
623 this->other_host = request->get_source(request);
624 this->other_host = this->other_host->clone(this->other_host);
625 }
626 if (generate_message(this, response, &packet) == SUCCESS)
627 {
628 charon->send_queue->add(charon->send_queue, packet);
629 }
630 response->destroy(response);
631 }
632
633 /**
634 * Implementation of ike_sa_t.process_message.
635 */
636 static status_t process_message(private_ike_sa_t *this, message_t *message)
637 {
638 status_t status;
639 bool is_request;
640
641 is_request = message->get_request(message);
642
643 status = message->parse_body(message, this->crypter_in, this->signer_in);
644 if (status != SUCCESS)
645 {
646
647 if (is_request)
648 {
649 switch (status)
650 {
651 case NOT_SUPPORTED:
652 DBG1(DBG_IKE, "ciritcal unknown payloads found");
653 if (is_request)
654 {
655 send_notify_response(this, message, UNSUPPORTED_CRITICAL_PAYLOAD);
656 }
657 break;
658 case PARSE_ERROR:
659 DBG1(DBG_IKE, "message parsing failed");
660 if (is_request)
661 {
662 send_notify_response(this, message, INVALID_SYNTAX);
663 }
664 break;
665 case VERIFY_ERROR:
666 DBG1(DBG_IKE, "message verification failed");
667 if (is_request)
668 {
669 send_notify_response(this, message, INVALID_SYNTAX);
670 }
671 break;
672 case FAILED:
673 DBG1(DBG_IKE, "integrity check failed");
674 /* ignored */
675 break;
676 case INVALID_STATE:
677 DBG1(DBG_IKE, "found encrypted message, but no keys available");
678 if (is_request)
679 {
680 send_notify_response(this, message, INVALID_SYNTAX);
681 }
682 default:
683 break;
684 }
685 }
686 DBG1(DBG_IKE, "%N %s with message ID %d processing failed",
687 exchange_type_names, message->get_exchange_type(message),
688 message->get_request(message) ? "request" : "response",
689 message->get_message_id(message));
690 return status;
691 }
692 else
693 {
694 host_t *me, *other;
695
696 me = message->get_destination(message);
697 other = message->get_source(message);
698
699 /* if this IKE_SA is virgin, we check for a connection */
700 if (this->connection == NULL)
701 {
702 job_t *job;
703 this->connection = charon->connections->get_connection_by_hosts(
704 charon->connections, me, other);
705 if (this->connection == NULL)
706 {
707 /* no connection found for these hosts, destroy */
708 DBG1(DBG_IKE, "no connection found for %H...%H, sending %N",
709 me, other, notify_type_names, NO_PROPOSAL_CHOSEN);
710 send_notify_response(this, message, NO_PROPOSAL_CHOSEN);
711 return DESTROY_ME;
712 }
713 /* add a timeout if peer does not establish it completely */
714 job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, FALSE);
715 charon->event_queue->add_relative(charon->event_queue, job,
716 charon->configuration->get_half_open_ike_sa_timeout(
717 charon->configuration));
718 }
719
720 /* check if message is trustworthy, and update connection information */
721 if (this->state == IKE_CREATED ||
722 message->get_exchange_type(message) != IKE_SA_INIT)
723 {
724 update_hosts(this, me, other);
725 this->time.inbound = time(NULL);
726 }
727 return this->task_manager->process_message(this->task_manager, message);
728 }
729 }
730
731 /**
732 * apply the connection/policy information to this IKE_SA
733 */
734 static void apply_config(private_ike_sa_t *this,
735 connection_t *connection, policy_t *policy)
736 {
737 host_t *me, *other;
738 identification_t *my_id, *other_id;
739
740 if (this->connection == NULL && this->policy == NULL)
741 {
742 this->connection = connection;
743 connection->get_ref(connection);
744 this->policy = policy;
745 policy->get_ref(policy);
746
747 me = connection->get_my_host(connection);
748 other = connection->get_other_host(connection);
749 my_id = policy->get_my_id(policy);
750 other_id = policy->get_other_id(policy);
751 set_my_host(this, me->clone(me));
752 set_other_host(this, other->clone(other));
753 DESTROY_IF(this->my_id);
754 DESTROY_IF(this->other_id);
755 this->my_id = my_id->clone(my_id);
756 this->other_id = other_id->clone(other_id);
757 }
758 }
759
760 /**
761 * Implementation of ike_sa_t.initiate.
762 */
763 static status_t initiate(private_ike_sa_t *this,
764 connection_t *connection, policy_t *policy)
765 {
766 task_t *task;
767
768 if (this->state == IKE_CREATED)
769 {
770 /* if we aren't established/establishing, do so */
771 apply_config(this, connection, policy);
772
773 if (this->other_host->is_anyaddr(this->other_host))
774 {
775 SIG(IKE_UP_START, "initiating IKE_SA");
776 SIG(IKE_UP_FAILED, "unable to initiate to %%any");
777 return DESTROY_ME;
778 }
779
780 task = (task_t*)ike_init_create(&this->public, TRUE, NULL);
781 this->task_manager->queue_task(this->task_manager, task);
782 task = (task_t*)ike_natd_create(&this->public, TRUE);
783 this->task_manager->queue_task(this->task_manager, task);
784 task = (task_t*)ike_cert_create(&this->public, TRUE);
785 this->task_manager->queue_task(this->task_manager, task);
786 task = (task_t*)ike_auth_create(&this->public, TRUE);
787 this->task_manager->queue_task(this->task_manager, task);
788 task = (task_t*)ike_config_create(&this->public, policy);
789 this->task_manager->queue_task(this->task_manager, task);
790 }
791
792 task = (task_t*)child_create_create(&this->public, policy);
793 this->task_manager->queue_task(this->task_manager, task);
794
795 return this->task_manager->initiate(this->task_manager);
796 }
797
798 /**
799 * Implementation of ike_sa_t.acquire.
800 */
801 static status_t acquire(private_ike_sa_t *this, u_int32_t reqid)
802 {
803 policy_t *policy;
804 iterator_t *iterator;
805 child_sa_t *current, *child_sa = NULL;
806 task_t *task;
807 child_create_t *child_create;
808
809 if (this->state == IKE_DELETING)
810 {
811 SIG(CHILD_UP_START, "acquiring CHILD_SA on kernel request");
812 SIG(CHILD_UP_FAILED, "acquiring CHILD_SA (reqid %d) failed: "
813 "IKE_SA is deleting", reqid);
814 return FAILED;
815 }
816
817 /* find CHILD_SA */
818 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
819 while (iterator->iterate(iterator, (void**)&current))
820 {
821 if (current->get_reqid(current) == reqid)
822 {
823 child_sa = current;
824 break;
825 }
826 }
827 iterator->destroy(iterator);
828 if (!child_sa)
829 {
830 SIG(CHILD_UP_START, "acquiring CHILD_SA on kernel request");
831 SIG(CHILD_UP_FAILED, "acquiring CHILD_SA (reqid %d) failed: "
832 "CHILD_SA not found", reqid);
833 return FAILED;
834 }
835
836 policy = child_sa->get_policy(child_sa);
837
838 if (this->state == IKE_CREATED)
839 {
840 task = (task_t*)ike_init_create(&this->public, TRUE, NULL);
841 this->task_manager->queue_task(this->task_manager, task);
842 task = (task_t*)ike_natd_create(&this->public, TRUE);
843 this->task_manager->queue_task(this->task_manager, task);
844 task = (task_t*)ike_cert_create(&this->public, TRUE);
845 this->task_manager->queue_task(this->task_manager, task);
846 task = (task_t*)ike_auth_create(&this->public, TRUE);
847 this->task_manager->queue_task(this->task_manager, task);
848 task = (task_t*)ike_config_create(&this->public, policy);
849 this->task_manager->queue_task(this->task_manager, task);
850 }
851
852 child_create = child_create_create(&this->public, policy);
853 child_create->use_reqid(child_create, reqid);
854 this->task_manager->queue_task(this->task_manager, (task_t*)child_create);
855
856 return this->task_manager->initiate(this->task_manager);
857 }
858
859 /**
860 * compare two lists of traffic selectors for equality
861 */
862 static bool ts_list_equals(linked_list_t *l1, linked_list_t *l2)
863 {
864 bool equals = TRUE;
865 iterator_t *i1, *i2;
866 traffic_selector_t *t1, *t2;
867
868 if (l1->get_count(l1) != l2->get_count(l2))
869 {
870 return FALSE;
871 }
872
873 i1 = l1->create_iterator(l1, TRUE);
874 i2 = l2->create_iterator(l2, TRUE);
875 while (i1->iterate(i1, (void**)&t1) && i2->iterate(i2, (void**)&t2))
876 {
877 if (!t1->equals(t1, t2))
878 {
879 equals = FALSE;
880 break;
881 }
882 }
883 i1->destroy(i1);
884 i2->destroy(i2);
885 return equals;
886 }
887
888 /**
889 * Implementation of ike_sa_t.route.
890 */
891 static status_t route(private_ike_sa_t *this, connection_t *connection, policy_t *policy)
892 {
893 child_sa_t *child_sa = NULL;
894 iterator_t *iterator;
895 linked_list_t *my_ts, *other_ts;
896 status_t status;
897
898 SIG(CHILD_ROUTE_START, "routing CHILD_SA");
899
900 /* check if not already routed*/
901 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
902 while (iterator->iterate(iterator, (void**)&child_sa))
903 {
904 if (child_sa->get_state(child_sa) == CHILD_ROUTED)
905 {
906 linked_list_t *my_ts_conf, *other_ts_conf;
907
908 my_ts = child_sa->get_my_traffic_selectors(child_sa);
909 other_ts = child_sa->get_other_traffic_selectors(child_sa);
910
911 my_ts_conf = policy->get_my_traffic_selectors(policy, this->my_host);
912 other_ts_conf = policy->get_other_traffic_selectors(policy, this->other_host);
913
914 if (ts_list_equals(my_ts, my_ts_conf) &&
915 ts_list_equals(other_ts, other_ts_conf))
916 {
917 iterator->destroy(iterator);
918 my_ts_conf->destroy_offset(my_ts_conf, offsetof(traffic_selector_t, destroy));
919 other_ts_conf->destroy_offset(other_ts_conf, offsetof(traffic_selector_t, destroy));
920 SIG(CHILD_ROUTE_FAILED, "CHILD_SA with such a policy already routed");
921 return FAILED;
922 }
923 my_ts_conf->destroy_offset(my_ts_conf, offsetof(traffic_selector_t, destroy));
924 other_ts_conf->destroy_offset(other_ts_conf, offsetof(traffic_selector_t, destroy));
925 }
926 }
927 iterator->destroy(iterator);
928
929 switch (this->state)
930 {
931 case IKE_DELETING:
932 case IKE_REKEYING:
933 SIG(CHILD_ROUTE_FAILED,
934 "unable to route CHILD_SA, as its IKE_SA gets deleted");
935 return FAILED;
936 case IKE_CREATED:
937 /* apply connection information, we need it to acquire */
938 apply_config(this, connection, policy);
939 break;
940 case IKE_CONNECTING:
941 case IKE_ESTABLISHED:
942 default:
943 break;
944 }
945
946 /* install kernel policies */
947 child_sa = child_sa_create(this->my_host, this->other_host,
948 this->my_id, this->other_id, policy, FALSE, 0);
949
950 my_ts = policy->get_my_traffic_selectors(policy, this->my_host);
951 other_ts = policy->get_other_traffic_selectors(policy, this->other_host);
952 status = child_sa->add_policies(child_sa, my_ts, other_ts,
953 policy->get_mode(policy));
954 my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
955 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
956 this->child_sas->insert_last(this->child_sas, child_sa);
957 SIG(CHILD_ROUTE_SUCCESS, "CHILD_SA routed");
958 return status;
959 }
960
961 /**
962 * Implementation of ike_sa_t.unroute.
963 */
964 static status_t unroute(private_ike_sa_t *this, policy_t *policy)
965 {
966 iterator_t *iterator;
967 child_sa_t *child_sa = NULL;
968 bool found = FALSE;
969 linked_list_t *my_ts, *other_ts, *my_ts_conf, *other_ts_conf;
970
971 SIG(CHILD_UNROUTE_START, "unrouting CHILD_SA");
972
973 /* find CHILD_SA in ROUTED state */
974 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
975 while (iterator->iterate(iterator, (void**)&child_sa))
976 {
977 if (child_sa->get_state(child_sa) == CHILD_ROUTED)
978 {
979 my_ts = child_sa->get_my_traffic_selectors(child_sa);
980 other_ts = child_sa->get_other_traffic_selectors(child_sa);
981
982 my_ts_conf = policy->get_my_traffic_selectors(policy, this->my_host);
983 other_ts_conf = policy->get_other_traffic_selectors(policy, this->other_host);
984
985 if (ts_list_equals(my_ts, my_ts_conf) &&
986 ts_list_equals(other_ts, other_ts_conf))
987 {
988 iterator->remove(iterator);
989 SIG(CHILD_UNROUTE_SUCCESS, "CHILD_SA unrouted");
990 child_sa->destroy(child_sa);
991 my_ts_conf->destroy_offset(my_ts_conf, offsetof(traffic_selector_t, destroy));
992 other_ts_conf->destroy_offset(other_ts_conf, offsetof(traffic_selector_t, destroy));
993 found = TRUE;
994 break;
995 }
996 my_ts_conf->destroy_offset(my_ts_conf, offsetof(traffic_selector_t, destroy));
997 other_ts_conf->destroy_offset(other_ts_conf, offsetof(traffic_selector_t, destroy));
998 }
999 }
1000 iterator->destroy(iterator);
1001
1002 if (!found)
1003 {
1004 SIG(CHILD_UNROUTE_FAILED, "CHILD_SA to unroute not found");
1005 return FAILED;
1006 }
1007 /* if we are not established, and we have no more routed childs, remove whole SA */
1008 if (this->state == IKE_CREATED &&
1009 this->child_sas->get_count(this->child_sas) == 0)
1010 {
1011 return DESTROY_ME;
1012 }
1013 return SUCCESS;
1014 }
1015
1016 /**
1017 * Implementation of ike_sa_t.retransmit.
1018 */
1019 static status_t retransmit(private_ike_sa_t *this, u_int32_t message_id)
1020 {
1021 this->time.outbound = time(NULL);
1022 if (this->task_manager->retransmit(this->task_manager, message_id) != SUCCESS)
1023 {
1024 policy_t *policy;
1025 child_sa_t* child_sa;
1026 linked_list_t *to_route, *to_restart;
1027 iterator_t *iterator;
1028
1029 /* send a proper signal to brief interested bus listeners */
1030 switch (this->state)
1031 {
1032 case IKE_CONNECTING:
1033 {
1034 /* retry IKE_SA_INIT if we have multiple keyingtries */
1035 u_int32_t tries = this->connection->get_keyingtries(this->connection);
1036 this->keyingtry++;
1037 if (tries == 0 || tries > this->keyingtry)
1038 {
1039 SIG(IKE_UP_FAILED, "peer not responding, trying again "
1040 "(%d/%d) in background ", this->keyingtry + 1, tries);
1041 reset(this);
1042 return this->task_manager->initiate(this->task_manager);
1043 }
1044 SIG(IKE_UP_FAILED, "establishing IKE_SA failed, peer not responding");
1045 break;
1046 }
1047 case IKE_REKEYING:
1048 SIG(IKE_REKEY_FAILED, "rekeying IKE_SA failed, peer not responding");
1049 break;
1050 case IKE_DELETING:
1051 SIG(IKE_DOWN_FAILED, "proper IKE_SA delete failed, peer not responding");
1052 break;
1053 default:
1054 break;
1055 }
1056
1057 /* summarize how we have to handle each child */
1058 to_route = linked_list_create();
1059 to_restart = linked_list_create();
1060 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
1061 while (iterator->iterate(iterator, (void**)&child_sa))
1062 {
1063 policy = child_sa->get_policy(child_sa);
1064
1065 if (child_sa->get_state(child_sa) == CHILD_ROUTED)
1066 {
1067 /* reroute routed CHILD_SAs */
1068 to_route->insert_last(to_route, policy);
1069 }
1070 else
1071 {
1072 /* use DPD action for established CHILD_SAs */
1073 switch (policy->get_dpd_action(policy))
1074 {
1075 case DPD_ROUTE:
1076 to_route->insert_last(to_route, policy);
1077 break;
1078 case DPD_RESTART:
1079 to_restart->insert_last(to_restart, policy);
1080 break;
1081 default:
1082 break;
1083 }
1084 }
1085 }
1086 iterator->destroy(iterator);
1087
1088 /* create a new IKE_SA if we have to route or to restart */
1089 if (to_route->get_count(to_route) || to_restart->get_count(to_restart))
1090 {
1091 ike_sa_id_t *other_id;
1092 private_ike_sa_t *new;
1093 task_t *task;
1094
1095 other_id = ike_sa_id_create(0, 0, TRUE);
1096 new = (private_ike_sa_t*)charon->ike_sa_manager->checkout(
1097 charon->ike_sa_manager, other_id);
1098 other_id->destroy(other_id);
1099
1100 apply_config(new, this->connection, this->policy);
1101 /* use actual used host, not the wildcarded one in connection */
1102 new->other_host->destroy(new->other_host);
1103 new->other_host = this->other_host->clone(this->other_host);
1104
1105 /* install routes */
1106 while (to_route->remove_last(to_route, (void**)&policy) == SUCCESS)
1107 {
1108 route(new, new->connection, policy);
1109 }
1110
1111 /* restart children */
1112 if (to_restart->get_count(to_restart))
1113 {
1114 task = (task_t*)ike_init_create(&new->public, TRUE, NULL);
1115 new->task_manager->queue_task(new->task_manager, task);
1116 task = (task_t*)ike_natd_create(&new->public, TRUE);
1117 new->task_manager->queue_task(new->task_manager, task);
1118 task = (task_t*)ike_cert_create(&new->public, TRUE);
1119 new->task_manager->queue_task(new->task_manager, task);
1120 task = (task_t*)ike_config_create(&new->public, new->policy);
1121 new->task_manager->queue_task(new->task_manager, task);
1122 task = (task_t*)ike_auth_create(&new->public, TRUE);
1123 new->task_manager->queue_task(new->task_manager, task);
1124
1125 while (to_restart->remove_last(to_restart, (void**)&policy) == SUCCESS)
1126 {
1127 task = (task_t*)child_create_create(&new->public, policy);
1128 new->task_manager->queue_task(new->task_manager, task);
1129 }
1130 new->task_manager->initiate(new->task_manager);
1131 }
1132 charon->ike_sa_manager->checkin(charon->ike_sa_manager, &new->public);
1133 }
1134 to_route->destroy(to_route);
1135 to_restart->destroy(to_restart);
1136 return DESTROY_ME;
1137 }
1138 return SUCCESS;
1139 }
1140
1141 /**
1142 * Implementation of ike_sa_t.get_prf.
1143 */
1144 static prf_t *get_prf(private_ike_sa_t *this)
1145 {
1146 return this->prf;
1147 }
1148
1149 /**
1150 * Implementation of ike_sa_t.get_prf.
1151 */
1152 static prf_t *get_child_prf(private_ike_sa_t *this)
1153 {
1154 return this->child_prf;
1155 }
1156
1157 /**
1158 * Implementation of ike_sa_t.get_auth_bild
1159 */
1160 static prf_t *get_auth_build(private_ike_sa_t *this)
1161 {
1162 return this->auth_build;
1163 }
1164
1165 /**
1166 * Implementation of ike_sa_t.get_auth_verify
1167 */
1168 static prf_t *get_auth_verify(private_ike_sa_t *this)
1169 {
1170 return this->auth_verify;
1171 }
1172
1173 /**
1174 * Implementation of ike_sa_t.get_id.
1175 */
1176 static ike_sa_id_t* get_id(private_ike_sa_t *this)
1177 {
1178 return this->ike_sa_id;
1179 }
1180
1181 /**
1182 * Implementation of ike_sa_t.get_my_id.
1183 */
1184 static identification_t* get_my_id(private_ike_sa_t *this)
1185 {
1186 return this->my_id;
1187 }
1188
1189 /**
1190 * Implementation of ike_sa_t.set_my_id.
1191 */
1192 static void set_my_id(private_ike_sa_t *this, identification_t *me)
1193 {
1194 DESTROY_IF(this->my_id);
1195 this->my_id = me;
1196 }
1197
1198 /**
1199 * Implementation of ike_sa_t.get_other_id.
1200 */
1201 static identification_t* get_other_id(private_ike_sa_t *this)
1202 {
1203 return this->other_id;
1204 }
1205
1206 /**
1207 * Implementation of ike_sa_t.set_other_id.
1208 */
1209 static void set_other_id(private_ike_sa_t *this, identification_t *other)
1210 {
1211 DESTROY_IF(this->other_id);
1212 this->other_id = other;
1213 }
1214
1215 /**
1216 * Implementation of ike_sa_t.derive_keys.
1217 */
1218 static status_t derive_keys(private_ike_sa_t *this,
1219 proposal_t *proposal, chunk_t secret,
1220 chunk_t nonce_i, chunk_t nonce_r,
1221 bool initiator, prf_t *child_prf, prf_t *old_prf)
1222 {
1223 prf_plus_t *prf_plus;
1224 chunk_t skeyseed, key, nonces, prf_plus_seed;
1225 algorithm_t *algo;
1226 size_t key_size;
1227 crypter_t *crypter_i, *crypter_r;
1228 signer_t *signer_i, *signer_r;
1229 prf_t *prf_i, *prf_r;
1230 u_int8_t spi_i_buf[sizeof(u_int64_t)], spi_r_buf[sizeof(u_int64_t)];
1231 chunk_t spi_i = chunk_from_buf(spi_i_buf);
1232 chunk_t spi_r = chunk_from_buf(spi_r_buf);
1233
1234 /* Create SAs general purpose PRF first, we may use it here */
1235 if (!proposal->get_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, &algo))
1236 {
1237 DBG1(DBG_IKE, "key derivation failed: no PSEUDO_RANDOM_FUNCTION");;
1238 return FAILED;
1239 }
1240 this->prf = prf_create(algo->algorithm);
1241 if (this->prf == NULL)
1242 {
1243 DBG1(DBG_IKE, "key derivation failed: PSEUDO_RANDOM_FUNCTION "
1244 "%N not supported!", pseudo_random_function_names, algo->algorithm);
1245 return FAILED;
1246 }
1247
1248 DBG4(DBG_IKE, "shared Diffie Hellman secret %B", &secret);
1249 nonces = chunk_cat("cc", nonce_i, nonce_r);
1250 *((u_int64_t*)spi_i.ptr) = this->ike_sa_id->get_initiator_spi(this->ike_sa_id);
1251 *((u_int64_t*)spi_r.ptr) = this->ike_sa_id->get_responder_spi(this->ike_sa_id);
1252 prf_plus_seed = chunk_cat("ccc", nonces, spi_i, spi_r);
1253
1254 /* KEYMAT = prf+ (SKEYSEED, Ni | Nr | SPIi | SPIr)
1255 *
1256 * if we are rekeying, SKEYSEED is built on another way
1257 */
1258 if (child_prf == NULL) /* not rekeying */
1259 {
1260 /* SKEYSEED = prf(Ni | Nr, g^ir) */
1261 this->prf->set_key(this->prf, nonces);
1262 this->prf->allocate_bytes(this->prf, secret, &skeyseed);
1263 DBG4(DBG_IKE, "SKEYSEED %B", &skeyseed);
1264 this->prf->set_key(this->prf, skeyseed);
1265 chunk_free(&skeyseed);
1266 chunk_free(&secret);
1267 prf_plus = prf_plus_create(this->prf, prf_plus_seed);
1268 }
1269 else
1270 {
1271 /* SKEYSEED = prf(SK_d (old), [g^ir (new)] | Ni | Nr)
1272 * use OLD SAs PRF functions for both prf_plus and prf */
1273 secret = chunk_cat("mc", secret, nonces);
1274 child_prf->allocate_bytes(child_prf, secret, &skeyseed);
1275 DBG4(DBG_IKE, "SKEYSEED %B", &skeyseed);
1276 old_prf->set_key(old_prf, skeyseed);
1277 chunk_free(&skeyseed);
1278 chunk_free(&secret);
1279 prf_plus = prf_plus_create(old_prf, prf_plus_seed);
1280 }
1281 chunk_free(&nonces);
1282 chunk_free(&prf_plus_seed);
1283
1284 /* KEYMAT = SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr */
1285
1286 /* SK_d is used for generating CHILD_SA key mat => child_prf */
1287 proposal->get_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, &algo);
1288 this->child_prf = prf_create(algo->algorithm);
1289 key_size = this->child_prf->get_key_size(this->child_prf);
1290 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1291 DBG4(DBG_IKE, "Sk_d secret %B", &key);
1292 this->child_prf->set_key(this->child_prf, key);
1293 chunk_free(&key);
1294
1295 /* SK_ai/SK_ar used for integrity protection => signer_in/signer_out */
1296 if (!proposal->get_algorithm(proposal, INTEGRITY_ALGORITHM, &algo))
1297 {
1298 DBG1(DBG_IKE, "key derivation failed: no INTEGRITY_ALGORITHM");
1299 return FAILED;
1300 }
1301 signer_i = signer_create(algo->algorithm);
1302 signer_r = signer_create(algo->algorithm);
1303 if (signer_i == NULL || signer_r == NULL)
1304 {
1305 DBG1(DBG_IKE, "key derivation failed: INTEGRITY_ALGORITHM "
1306 "%N not supported!", integrity_algorithm_names ,algo->algorithm);
1307 return FAILED;
1308 }
1309 key_size = signer_i->get_key_size(signer_i);
1310
1311 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1312 DBG4(DBG_IKE, "Sk_ai secret %B", &key);
1313 signer_i->set_key(signer_i, key);
1314 chunk_free(&key);
1315
1316 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1317 DBG4(DBG_IKE, "Sk_ar secret %B", &key);
1318 signer_r->set_key(signer_r, key);
1319 chunk_free(&key);
1320
1321 if (initiator)
1322 {
1323 this->signer_in = signer_r;
1324 this->signer_out = signer_i;
1325 }
1326 else
1327 {
1328 this->signer_in = signer_i;
1329 this->signer_out = signer_r;
1330 }
1331
1332 /* SK_ei/SK_er used for encryption => crypter_in/crypter_out */
1333 if (!proposal->get_algorithm(proposal, ENCRYPTION_ALGORITHM, &algo))
1334 {
1335 DBG1(DBG_IKE, "key derivation failed: no ENCRYPTION_ALGORITHM");
1336 return FAILED;
1337 }
1338 crypter_i = crypter_create(algo->algorithm, algo->key_size / 8);
1339 crypter_r = crypter_create(algo->algorithm, algo->key_size / 8);
1340 if (crypter_i == NULL || crypter_r == NULL)
1341 {
1342 DBG1(DBG_IKE, "key derivation failed: ENCRYPTION_ALGORITHM "
1343 "%N (key size %d) not supported!",
1344 encryption_algorithm_names, algo->algorithm, algo->key_size);
1345 return FAILED;
1346 }
1347 key_size = crypter_i->get_key_size(crypter_i);
1348
1349 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1350 DBG4(DBG_IKE, "Sk_ei secret %B", &key);
1351 crypter_i->set_key(crypter_i, key);
1352 chunk_free(&key);
1353
1354 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1355 DBG4(DBG_IKE, "Sk_er secret %B", &key);
1356 crypter_r->set_key(crypter_r, key);
1357 chunk_free(&key);
1358
1359 if (initiator)
1360 {
1361 this->crypter_in = crypter_r;
1362 this->crypter_out = crypter_i;
1363 }
1364 else
1365 {
1366 this->crypter_in = crypter_i;
1367 this->crypter_out = crypter_r;
1368 }
1369
1370 /* SK_pi/SK_pr used for authentication => prf_auth_i, prf_auth_r */
1371 proposal->get_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, &algo);
1372 prf_i = prf_create(algo->algorithm);
1373 prf_r = prf_create(algo->algorithm);
1374
1375 key_size = prf_i->get_key_size(prf_i);
1376 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1377 DBG4(DBG_IKE, "Sk_pi secret %B", &key);
1378 prf_i->set_key(prf_i, key);
1379 chunk_free(&key);
1380
1381 prf_plus->allocate_bytes(prf_plus, key_size, &key);
1382 DBG4(DBG_IKE, "Sk_pr secret %B", &key);
1383 prf_r->set_key(prf_r, key);
1384 chunk_free(&key);
1385
1386 if (initiator)
1387 {
1388 this->auth_verify = prf_r;
1389 this->auth_build = prf_i;
1390 }
1391 else
1392 {
1393 this->auth_verify = prf_i;
1394 this->auth_build = prf_r;
1395 }
1396
1397 /* all done, prf_plus not needed anymore */
1398 prf_plus->destroy(prf_plus);
1399
1400 return SUCCESS;
1401 }
1402
1403 /**
1404 * Implementation of ike_sa_t.add_child_sa.
1405 */
1406 static void add_child_sa(private_ike_sa_t *this, child_sa_t *child_sa)
1407 {
1408 this->child_sas->insert_last(this->child_sas, child_sa);
1409 }
1410
1411 /**
1412 * Implementation of ike_sa_t.get_child_sa.
1413 */
1414 static child_sa_t* get_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
1415 u_int32_t spi, bool inbound)
1416 {
1417 iterator_t *iterator;
1418 child_sa_t *current, *found = NULL;
1419
1420 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
1421 while (iterator->iterate(iterator, (void**)&current))
1422 {
1423 if (current->get_spi(current, inbound) == spi &&
1424 current->get_protocol(current) == protocol)
1425 {
1426 found = current;
1427 }
1428 }
1429 iterator->destroy(iterator);
1430 return found;
1431 }
1432
1433 /**
1434 * Implementation of ike_sa_t.create_child_sa_iterator.
1435 */
1436 static iterator_t* create_child_sa_iterator(private_ike_sa_t *this)
1437 {
1438 return this->child_sas->create_iterator(this->child_sas, TRUE);
1439 }
1440
1441 /**
1442 * Implementation of ike_sa_t.rekey_child_sa.
1443 */
1444 static status_t rekey_child_sa(private_ike_sa_t *this, protocol_id_t protocol, u_int32_t spi)
1445 {
1446 child_sa_t *child_sa;
1447 child_rekey_t *child_rekey;
1448
1449 child_sa = get_child_sa(this, protocol, spi, TRUE);
1450 if (child_sa)
1451 {
1452 child_rekey = child_rekey_create(&this->public, child_sa);
1453 this->task_manager->queue_task(this->task_manager, &child_rekey->task);
1454 return this->task_manager->initiate(this->task_manager);
1455 }
1456 return FAILED;
1457 }
1458
1459 /**
1460 * Implementation of ike_sa_t.delete_child_sa.
1461 */
1462 static status_t delete_child_sa(private_ike_sa_t *this, protocol_id_t protocol, u_int32_t spi)
1463 {
1464 child_sa_t *child_sa;
1465 child_delete_t *child_delete;
1466
1467 child_sa = get_child_sa(this, protocol, spi, TRUE);
1468 if (child_sa)
1469 {
1470 child_delete = child_delete_create(&this->public, child_sa);
1471 this->task_manager->queue_task(this->task_manager, &child_delete->task);
1472 return this->task_manager->initiate(this->task_manager);
1473 }
1474 return FAILED;
1475 }
1476
1477 /**
1478 * Implementation of ike_sa_t.destroy_child_sa.
1479 */
1480 static status_t destroy_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
1481 u_int32_t spi)
1482 {
1483 iterator_t *iterator;
1484 child_sa_t *child_sa;
1485 status_t status = NOT_FOUND;
1486
1487 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
1488 while (iterator->iterate(iterator, (void**)&child_sa))
1489 {
1490 if (child_sa->get_protocol(child_sa) == protocol &&
1491 child_sa->get_spi(child_sa, TRUE) == spi)
1492 {
1493 child_sa->destroy(child_sa);
1494 iterator->remove(iterator);
1495 status = SUCCESS;
1496 break;
1497 }
1498 }
1499 iterator->destroy(iterator);
1500 return status;
1501 }
1502
1503 /**
1504 * Implementation of public_ike_sa_t.delete.
1505 */
1506 static status_t delete_(private_ike_sa_t *this)
1507 {
1508 ike_delete_t *ike_delete;
1509
1510 switch (this->state)
1511 {
1512 case IKE_ESTABLISHED:
1513 DBG1(DBG_IKE, "deleting IKE_SA");
1514 /* do not log when rekeyed */
1515 case IKE_REKEYING:
1516 ike_delete = ike_delete_create(&this->public, TRUE);
1517 this->task_manager->queue_task(this->task_manager, &ike_delete->task);
1518 return this->task_manager->initiate(this->task_manager);
1519 default:
1520 DBG1(DBG_IKE, "destroying IKE_SA in state %N without notification",
1521 ike_sa_state_names, this->state);
1522 break;
1523 }
1524 return DESTROY_ME;
1525 }
1526
1527 /**
1528 * Implementation of ike_sa_t.rekey.
1529 */
1530 static status_t rekey(private_ike_sa_t *this)
1531 {
1532 ike_rekey_t *ike_rekey;
1533
1534 ike_rekey = ike_rekey_create(&this->public, TRUE);
1535
1536 this->task_manager->queue_task(this->task_manager, &ike_rekey->task);
1537 return this->task_manager->initiate(this->task_manager);
1538 }
1539
1540 /**
1541 * Implementation of ike_sa_t.reestablish
1542 */
1543 static void reestablish(private_ike_sa_t *this)
1544 {
1545 ike_sa_id_t *other_id;
1546 private_ike_sa_t *other;
1547 iterator_t *iterator;
1548 child_sa_t *child_sa;
1549 policy_t *policy;
1550 task_t *task;
1551 job_t *job;
1552
1553 other_id = ike_sa_id_create(0, 0, TRUE);
1554 other = (private_ike_sa_t*)charon->ike_sa_manager->checkout(
1555 charon->ike_sa_manager, other_id);
1556 other_id->destroy(other_id);
1557
1558 apply_config(other, this->connection, this->policy);
1559 other->other_host->destroy(other->other_host);
1560 other->other_host = this->other_host->clone(this->other_host);
1561
1562 if (this->state == IKE_ESTABLISHED)
1563 {
1564 task = (task_t*)ike_init_create(&other->public, TRUE, NULL);
1565 other->task_manager->queue_task(other->task_manager, task);
1566 task = (task_t*)ike_natd_create(&other->public, TRUE);
1567 other->task_manager->queue_task(other->task_manager, task);
1568 task = (task_t*)ike_cert_create(&other->public, TRUE);
1569 other->task_manager->queue_task(other->task_manager, task);
1570 task = (task_t*)ike_config_create(&other->public, other->policy);
1571 other->task_manager->queue_task(other->task_manager, task);
1572 task = (task_t*)ike_auth_create(&other->public, TRUE);
1573 other->task_manager->queue_task(other->task_manager, task);
1574 }
1575
1576 other->task_manager->adopt_tasks(other->task_manager, this->task_manager);
1577
1578 /* Create task for established children, adopt routed children directly */
1579 iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
1580 while(iterator->iterate(iterator, (void**)&child_sa))
1581 {
1582 switch (child_sa->get_state(child_sa))
1583 {
1584 case CHILD_ROUTED:
1585 {
1586 iterator->remove(iterator);
1587 other->child_sas->insert_first(other->child_sas, child_sa);
1588 break;
1589 }
1590 default:
1591 {
1592 policy = child_sa->get_policy(child_sa);
1593 task = (task_t*)child_create_create(&other->public, policy);
1594 other->task_manager->queue_task(other->task_manager, task);
1595 break;
1596 }
1597 }
1598 }
1599 iterator->destroy(iterator);
1600
1601 other->task_manager->initiate(other->task_manager);
1602
1603 charon->ike_sa_manager->checkin(charon->ike_sa_manager, &other->public);
1604
1605 job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE);
1606 charon->job_queue->add(charon->job_queue, job);
1607 }
1608
1609 /**
1610 * Implementation of ike_sa_t.inherit.
1611 */
1612 static void inherit(private_ike_sa_t *this, private_ike_sa_t *other)
1613 {
1614 child_sa_t *child_sa;
1615 host_t *ip;
1616
1617 /* apply hosts and ids */
1618 this->my_host->destroy(this->my_host);
1619 this->other_host->destroy(this->other_host);
1620 this->my_id->destroy(this->my_id);
1621 this->other_id->destroy(this->other_id);
1622 this->my_host = other->my_host->clone(other->my_host);
1623 this->other_host = other->other_host->clone(other->other_host);
1624 this->my_id = other->my_id->clone(other->my_id);
1625 this->other_id = other->other_id->clone(other->other_id);
1626
1627 /* apply virtual assigned IPs... */
1628 if (other->my_virtual_ip)
1629 {
1630 this->my_virtual_ip = other->my_virtual_ip;
1631 other->my_virtual_ip = NULL;
1632 }
1633 if (other->other_virtual_ip)
1634 {
1635 this->other_virtual_ip = other->other_virtual_ip;
1636 other->other_virtual_ip = NULL;
1637 }
1638
1639 /* ... and DNS servers */
1640 while (other->dns_servers->remove_last(other->dns_servers,
1641 (void**)&ip) == SUCCESS)
1642 {
1643 this->dns_servers->insert_first(this->dns_servers, ip);
1644 }
1645
1646 /* adopt all children */
1647 while (other->child_sas->remove_last(other->child_sas,
1648 (void**)&child_sa) == SUCCESS)
1649 {
1650 this->child_sas->insert_first(this->child_sas, (void*)child_sa);
1651 }
1652 }
1653
1654 /**
1655 * Implementation of ike_sa_t.is_natt_enabled.
1656 */
1657 static bool is_natt_enabled(private_ike_sa_t *this)
1658 {
1659 return this->nat_here || this->nat_there;
1660 }
1661
1662 /**
1663 * Implementation of ike_sa_t.enable_natt.
1664 */
1665 static void enable_natt(private_ike_sa_t *this, bool local)
1666 {
1667 if (local)
1668 {
1669 DBG1(DBG_IKE, "local host is behind NAT, scheduling keep alives");
1670 this->nat_here = TRUE;
1671 send_keepalive(this);
1672 }
1673 else
1674 {
1675 DBG1(DBG_IKE, "remote host is behind NAT");
1676 this->nat_there = TRUE;
1677 }
1678 }
1679
1680 /**
1681 * Implementation of ike_sa_t.set_virtual_ip
1682 */
1683 static void set_virtual_ip(private_ike_sa_t *this, bool local, host_t *ip)
1684 {
1685 if (local)
1686 {
1687 DBG1(DBG_IKE, "installing new virtual IP %H", ip);
1688 if (this->my_virtual_ip)
1689 {
1690 DBG1(DBG_IKE, "removing old virtual IP %H", this->my_virtual_ip);
1691 charon->kernel_interface->del_ip(charon->kernel_interface,
1692 this->my_virtual_ip,
1693 this->my_host);
1694 this->my_virtual_ip->destroy(this->my_virtual_ip);
1695 }
1696 if (charon->kernel_interface->add_ip(charon->kernel_interface, ip,
1697 this->my_host) == SUCCESS)
1698 {
1699 this->my_virtual_ip = ip->clone(ip);
1700 }
1701 else
1702 {
1703 DBG1(DBG_IKE, "installing virtual IP %H failed", ip);
1704 this->my_virtual_ip = NULL;
1705 }
1706 }
1707 else
1708 {
1709 DESTROY_IF(this->other_virtual_ip);
1710 this->other_virtual_ip = ip->clone(ip);
1711 }
1712 }
1713
1714 /**
1715 * Implementation of ike_sa_t.get_virtual_ip
1716 */
1717 static host_t* get_virtual_ip(private_ike_sa_t *this, bool local)
1718 {
1719 if (local)
1720 {
1721 return this->my_virtual_ip;
1722 }
1723 else
1724 {
1725 return this->other_virtual_ip;
1726 }
1727 }
1728
1729 /**
1730 * Implementation of ike_sa_t.remove_dns_server
1731 */
1732 static void remove_dns_servers(private_ike_sa_t *this)
1733 {
1734 FILE *file;
1735 struct stat stats;
1736 chunk_t contents, line, orig_line, token;
1737 char string[INET6_ADDRSTRLEN];
1738 host_t *ip;
1739 iterator_t *iterator;
1740
1741 if (this->dns_servers->get_count(this->dns_servers) == 0)
1742 {
1743 /* don't touch anything if we have no nameservers installed */
1744 return;
1745 }
1746
1747 file = fopen(RESOLV_CONF, "r");
1748 if (file == NULL || stat(RESOLV_CONF, &stats) != 0)
1749 {
1750 DBG1(DBG_IKE, "unable to open DNS configuration file %s: %m", RESOLV_CONF);
1751 return;
1752 }
1753
1754 contents = chunk_alloca((size_t)stats.st_size);
1755
1756 if (fread(contents.ptr, 1, contents.len, file) != contents.len)
1757 {
1758 DBG1(DBG_IKE, "unable to read DNS configuration file: %m");
1759 fclose(file);
1760 return;
1761 }
1762
1763 fclose(file);
1764 file = fopen(RESOLV_CONF, "w");
1765 if (file == NULL)
1766 {
1767 DBG1(DBG_IKE, "unable to open DNS configuration file %s: %m", RESOLV_CONF);
1768 return;
1769 }
1770
1771 iterator = this->dns_servers->create_iterator(this->dns_servers, TRUE);
1772 while (fetchline(&contents, &line))
1773 {
1774 bool found = FALSE;
1775 orig_line = line;
1776 if (extract_token(&token, ' ', &line) &&
1777 strncasecmp(token.ptr, "nameserver", token.len) == 0)
1778 {
1779 if (!extract_token(&token, ' ', &line))
1780 {
1781 token = line;
1782 }
1783 iterator->reset(iterator);
1784 while (iterator->iterate(iterator, (void**)&ip))
1785 {
1786 snprintf(string, sizeof(string), "%H", ip);
1787 if (strlen(string) == token.len &&
1788 strncmp(token.ptr, string, token.len) == 0)
1789 {
1790 iterator->remove(iterator);
1791 ip->destroy(ip);
1792 found = TRUE;
1793 break;
1794 }
1795 }
1796 }
1797
1798 if (!found)
1799 {
1800 /* write line untouched back to file */
1801 fwrite(orig_line.ptr, orig_line.len, 1, file);
1802 fprintf(file, "\n");
1803 }
1804 }
1805 iterator->destroy(iterator);
1806 fclose(file);
1807 }
1808
1809 /**
1810 * Implementation of ike_sa_t.add_dns_server
1811 */
1812 static void add_dns_server(private_ike_sa_t *this, host_t *dns)
1813 {
1814 FILE *file;
1815 struct stat stats;
1816 chunk_t contents;
1817
1818 DBG1(DBG_IKE, "installing DNS server %H", dns);
1819
1820 file = fopen(RESOLV_CONF, "a+");
1821 if (file == NULL || stat(RESOLV_CONF, &stats) != 0)
1822 {
1823 DBG1(DBG_IKE, "unable to open DNS configuration file %s: %m", RESOLV_CONF);
1824 return;
1825 }
1826
1827 contents = chunk_alloca(stats.st_size);
1828
1829 if (fread(contents.ptr, 1, contents.len, file) != contents.len)
1830 {
1831 DBG1(DBG_IKE, "unable to read DNS configuration file: %m");
1832 fclose(file);
1833 return;
1834 }
1835
1836 fclose(file);
1837 file = fopen(RESOLV_CONF, "w");
1838 if (file == NULL)
1839 {
1840 DBG1(DBG_IKE, "unable to open DNS configuration file %s: %m", RESOLV_CONF);
1841 return;
1842 }
1843
1844 if (fprintf(file, "nameserver %H # added by strongSwan, assigned by %D\n",
1845 dns, this->other_id) < 0)
1846 {
1847 DBG1(DBG_IKE, "unable to write DNS configuration: %m");
1848 }
1849 else
1850 {
1851 this->dns_servers->insert_last(this->dns_servers, dns->clone(dns));
1852 }
1853 fwrite(contents.ptr, contents.len, 1, file);
1854
1855 fclose(file);
1856 }
1857
1858 /**
1859 * output handler in printf()
1860 */
1861 static int print(FILE *stream, const struct printf_info *info,
1862 const void *const *args)
1863 {
1864 int written = 0;
1865 bool reauth = FALSE;
1866 private_ike_sa_t *this = *((private_ike_sa_t**)(args[0]));
1867
1868 if (this->connection)
1869 {
1870 reauth = this->connection->get_reauth(this->connection);
1871 }
1872
1873 if (this == NULL)
1874 {
1875 return fprintf(stream, "(null)");
1876 }
1877
1878 written = fprintf(stream, "%12s[%d]: %N, %H[%D]...%H[%D]", get_name(this),
1879 this->unique_id, ike_sa_state_names, this->state,
1880 this->my_host, this->my_id, this->other_host,
1881 this->other_id);
1882 written += fprintf(stream, "\n%12s[%d]: IKE SPIs: %J, %s in %ds",
1883 get_name(this), this->unique_id, this->ike_sa_id,
1884 this->connection && reauth? "reauthentication":"rekeying",
1885 this->time.rekey - time(NULL));
1886
1887 if (info->alt)
1888 {
1889
1890 }
1891 return written;
1892 }
1893
1894 /**
1895 * register printf() handlers
1896 */
1897 static void __attribute__ ((constructor))print_register()
1898 {
1899 register_printf_function(PRINTF_IKE_SA, print, arginfo_ptr);
1900 }
1901
1902 /**
1903 * Implementation of ike_sa_t.destroy.
1904 */
1905 static void destroy(private_ike_sa_t *this)
1906 {
1907 this->child_sas->destroy_offset(this->child_sas, offsetof(child_sa_t, destroy));
1908
1909 DESTROY_IF(this->crypter_in);
1910 DESTROY_IF(this->crypter_out);
1911 DESTROY_IF(this->signer_in);
1912 DESTROY_IF(this->signer_out);
1913 DESTROY_IF(this->prf);
1914 DESTROY_IF(this->child_prf);
1915 DESTROY_IF(this->auth_verify);
1916 DESTROY_IF(this->auth_build);
1917
1918 if (this->my_virtual_ip)
1919 {
1920 charon->kernel_interface->del_ip(charon->kernel_interface,
1921 this->my_virtual_ip, this->my_host);
1922 this->my_virtual_ip->destroy(this->my_virtual_ip);
1923 }
1924 DESTROY_IF(this->other_virtual_ip);
1925
1926 remove_dns_servers(this);
1927 this->dns_servers->destroy_offset(this->dns_servers, offsetof(host_t, destroy));
1928
1929 DESTROY_IF(this->my_host);
1930 DESTROY_IF(this->other_host);
1931 DESTROY_IF(this->my_id);
1932 DESTROY_IF(this->other_id);
1933
1934 DESTROY_IF(this->connection);
1935 DESTROY_IF(this->policy);
1936
1937 this->ike_sa_id->destroy(this->ike_sa_id);
1938 this->task_manager->destroy(this->task_manager);
1939 free(this);
1940 }
1941
1942 /*
1943 * Described in header.
1944 */
1945 ike_sa_t * ike_sa_create(ike_sa_id_t *ike_sa_id)
1946 {
1947 private_ike_sa_t *this = malloc_thing(private_ike_sa_t);
1948 static u_int32_t unique_id = 0;
1949
1950 /* Public functions */
1951 this->public.get_state = (ike_sa_state_t(*)(ike_sa_t*)) get_state;
1952 this->public.set_state = (void(*)(ike_sa_t*,ike_sa_state_t)) set_state;
1953 this->public.get_name = (char*(*)(ike_sa_t*))get_name;
1954 this->public.process_message = (status_t(*)(ike_sa_t*, message_t*)) process_message;
1955 this->public.initiate = (status_t(*)(ike_sa_t*,connection_t*,policy_t*)) initiate;
1956 this->public.route = (status_t(*)(ike_sa_t*,connection_t*,policy_t*)) route;
1957 this->public.unroute = (status_t(*)(ike_sa_t*,policy_t*)) unroute;
1958 this->public.acquire = (status_t(*)(ike_sa_t*,u_int32_t)) acquire;
1959 this->public.get_connection = (connection_t*(*)(ike_sa_t*))get_connection;
1960 this->public.set_connection = (void(*)(ike_sa_t*,connection_t*))set_connection;
1961 this->public.get_policy = (policy_t*(*)(ike_sa_t*))get_policy;
1962 this->public.set_policy = (void(*)(ike_sa_t*,policy_t*))set_policy;
1963 this->public.get_id = (ike_sa_id_t*(*)(ike_sa_t*)) get_id;
1964 this->public.get_my_host = (host_t*(*)(ike_sa_t*)) get_my_host;
1965 this->public.set_my_host = (void(*)(ike_sa_t*,host_t*)) set_my_host;
1966 this->public.get_other_host = (host_t*(*)(ike_sa_t*)) get_other_host;
1967 this->public.set_other_host = (void(*)(ike_sa_t*,host_t*)) set_other_host;
1968 this->public.get_my_id = (identification_t*(*)(ike_sa_t*)) get_my_id;
1969 this->public.set_my_id = (void(*)(ike_sa_t*,identification_t*)) set_my_id;
1970 this->public.get_other_id = (identification_t*(*)(ike_sa_t*)) get_other_id;
1971 this->public.set_other_id = (void(*)(ike_sa_t*,identification_t*)) set_other_id;
1972 this->public.retransmit = (status_t (*) (ike_sa_t *, u_int32_t)) retransmit;
1973 this->public.delete = (status_t(*)(ike_sa_t*))delete_;
1974 this->public.destroy = (void(*)(ike_sa_t*))destroy;
1975 this->public.send_dpd = (status_t (*)(ike_sa_t*)) send_dpd;
1976 this->public.send_keepalive = (void (*)(ike_sa_t*)) send_keepalive;
1977 this->public.get_prf = (prf_t *(*) (ike_sa_t *)) get_prf;
1978 this->public.get_child_prf = (prf_t *(*) (ike_sa_t *)) get_child_prf;
1979 this->public.get_auth_verify = (prf_t *(*) (ike_sa_t *)) get_auth_verify;
1980 this->public.get_auth_build = (prf_t *(*) (ike_sa_t *)) get_auth_build;
1981 this->public.derive_keys = (status_t (*) (ike_sa_t *,proposal_t*,chunk_t,chunk_t,chunk_t,bool,prf_t*,prf_t*)) derive_keys;
1982 this->public.add_child_sa = (void (*) (ike_sa_t*,child_sa_t*)) add_child_sa;
1983 this->public.get_child_sa = (child_sa_t* (*)(ike_sa_t*,protocol_id_t,u_int32_t,bool)) get_child_sa;
1984 this->public.create_child_sa_iterator = (iterator_t* (*)(ike_sa_t*)) create_child_sa_iterator;
1985 this->public.rekey_child_sa = (status_t(*)(ike_sa_t*,protocol_id_t,u_int32_t)) rekey_child_sa;
1986 this->public.delete_child_sa = (status_t(*)(ike_sa_t*,protocol_id_t,u_int32_t)) delete_child_sa;
1987 this->public.destroy_child_sa = (status_t (*)(ike_sa_t*,protocol_id_t,u_int32_t))destroy_child_sa;
1988 this->public.enable_natt = (void(*)(ike_sa_t*, bool)) enable_natt;
1989 this->public.is_natt_enabled = (bool(*)(ike_sa_t*)) is_natt_enabled;
1990 this->public.rekey = (status_t(*)(ike_sa_t*))rekey;
1991 this->public.reestablish = (void(*)(ike_sa_t*))reestablish;
1992 this->public.inherit = (void(*)(ike_sa_t*,ike_sa_t*))inherit;
1993 this->public.generate_message = (status_t(*)(ike_sa_t*,message_t*,packet_t**))generate_message;
1994 this->public.reset = (void(*)(ike_sa_t*))reset;
1995 this->public.get_unique_id = (u_int32_t(*)(ike_sa_t*))get_unique_id;
1996 this->public.set_virtual_ip = (void(*)(ike_sa_t*,bool,host_t*))set_virtual_ip;
1997 this->public.get_virtual_ip = (host_t*(*)(ike_sa_t*,bool))get_virtual_ip;
1998 this->public.add_dns_server = (void(*)(ike_sa_t*,host_t*))add_dns_server;
1999
2000 /* initialize private fields */
2001 this->ike_sa_id = ike_sa_id->clone(ike_sa_id);
2002 this->child_sas = linked_list_create();
2003 this->my_host = host_create_any(AF_INET);
2004 this->other_host = host_create_any(AF_INET);
2005 this->my_id = identification_create_from_encoding(ID_ANY, chunk_empty);
2006 this->other_id = identification_create_from_encoding(ID_ANY, chunk_empty);
2007 this->crypter_in = NULL;
2008 this->crypter_out = NULL;
2009 this->signer_in = NULL;
2010 this->signer_out = NULL;
2011 this->prf = NULL;
2012 this->auth_verify = NULL;
2013 this->auth_build = NULL;
2014 this->child_prf = NULL;
2015 this->nat_here = FALSE;
2016 this->nat_there = FALSE;
2017 this->state = IKE_CREATED;
2018 this->time.inbound = this->time.outbound = time(NULL);
2019 this->time.established = 0;
2020 this->time.rekey = 0;
2021 this->time.delete = 0;
2022 this->connection = NULL;
2023 this->policy = NULL;
2024 this->task_manager = task_manager_create(&this->public);
2025 this->unique_id = ++unique_id;
2026 this->my_virtual_ip = NULL;
2027 this->other_virtual_ip = NULL;
2028 this->dns_servers = linked_list_create();
2029 this->keyingtry = 0;
2030
2031 return &this->public;
2032 }
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