Enforce uniqueids=keep only for non-XAuth Main/Agressive Modes
[strongswan.git] / src / libcharon / sa / ikev1 / tasks / aggressive_mode.c
1 /*
2 * Copyright (C) 2012 Tobias Brunner
3 * Hochschule fuer Technik Rapperswil
4 *
5 * Copyright (C) 2012 Martin Willi
6 * Copyright (C) 2012 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 "aggressive_mode.h"
20
21 #include <string.h>
22
23 #include <daemon.h>
24 #include <sa/ikev1/phase1.h>
25 #include <encoding/payloads/sa_payload.h>
26 #include <encoding/payloads/id_payload.h>
27 #include <encoding/payloads/hash_payload.h>
28 #include <sa/ikev1/tasks/xauth.h>
29 #include <sa/ikev1/tasks/mode_config.h>
30 #include <sa/ikev1/tasks/informational.h>
31 #include <sa/ikev1/tasks/isakmp_delete.h>
32 #include <processing/jobs/adopt_children_job.h>
33
34 typedef struct private_aggressive_mode_t private_aggressive_mode_t;
35
36 /**
37 * Private members of a aggressive_mode_t task.
38 */
39 struct private_aggressive_mode_t {
40
41 /**
42 * Public methods and task_t interface.
43 */
44 aggressive_mode_t public;
45
46 /**
47 * Assigned IKE_SA.
48 */
49 ike_sa_t *ike_sa;
50
51 /**
52 * Are we the initiator?
53 */
54 bool initiator;
55
56 /**
57 * Common phase 1 helper class
58 */
59 phase1_t *ph1;
60
61 /**
62 * IKE config to establish
63 */
64 ike_cfg_t *ike_cfg;
65
66 /**
67 * Peer config to use
68 */
69 peer_cfg_t *peer_cfg;
70
71 /**
72 * selected IKE proposal
73 */
74 proposal_t *proposal;
75
76 /**
77 * Negotiated SA lifetime
78 */
79 u_int32_t lifetime;
80
81 /**
82 * Negotiated authentication method
83 */
84 auth_method_t method;
85
86 /**
87 * Encoded ID payload, without fixed header
88 */
89 chunk_t id_data;
90
91 /** states of aggressive mode */
92 enum {
93 AM_INIT,
94 AM_AUTH,
95 } state;
96 };
97
98 /**
99 * Set IKE_SA to established state
100 */
101 static bool establish(private_aggressive_mode_t *this)
102 {
103 if (!charon->bus->authorize(charon->bus, TRUE))
104 {
105 DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, cancelling");
106 return FALSE;
107 }
108
109 DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
110 this->ike_sa->get_name(this->ike_sa),
111 this->ike_sa->get_unique_id(this->ike_sa),
112 this->ike_sa->get_my_host(this->ike_sa),
113 this->ike_sa->get_my_id(this->ike_sa),
114 this->ike_sa->get_other_host(this->ike_sa),
115 this->ike_sa->get_other_id(this->ike_sa));
116
117 this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
118 charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
119
120 return TRUE;
121 }
122
123 /**
124 * Check for notify errors, return TRUE if error found
125 */
126 static bool has_notify_errors(private_aggressive_mode_t *this, message_t *message)
127 {
128 enumerator_t *enumerator;
129 payload_t *payload;
130 bool err = FALSE;
131
132 enumerator = message->create_payload_enumerator(message);
133 while (enumerator->enumerate(enumerator, &payload))
134 {
135 if (payload->get_type(payload) == NOTIFY_V1)
136 {
137 notify_payload_t *notify;
138 notify_type_t type;
139
140 notify = (notify_payload_t*)payload;
141 type = notify->get_notify_type(notify);
142 if (type < 16384)
143 {
144 DBG1(DBG_IKE, "received %N error notify",
145 notify_type_names, type);
146 err = TRUE;
147 }
148 else
149 {
150 DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
151 }
152 }
153 }
154 enumerator->destroy(enumerator);
155
156 return err;
157 }
158
159 /**
160 * Queue a task sending a notify in an INFORMATIONAL exchange
161 */
162 static status_t send_notify(private_aggressive_mode_t *this, notify_type_t type)
163 {
164 notify_payload_t *notify;
165 ike_sa_id_t *ike_sa_id;
166 u_int64_t spi_i, spi_r;
167 chunk_t spi;
168
169 notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
170 PROTO_IKE, type);
171 ike_sa_id = this->ike_sa->get_id(this->ike_sa);
172 spi_i = ike_sa_id->get_initiator_spi(ike_sa_id);
173 spi_r = ike_sa_id->get_responder_spi(ike_sa_id);
174 spi = chunk_cata("cc", chunk_from_thing(spi_i), chunk_from_thing(spi_r));
175 notify->set_spi_data(notify, spi);
176
177 this->ike_sa->queue_task(this->ike_sa,
178 (task_t*)informational_create(this->ike_sa, notify));
179 /* cancel all active/passive tasks in favour of informational */
180 this->ike_sa->flush_queue(this->ike_sa,
181 this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
182 return ALREADY_DONE;
183 }
184
185 /**
186 * Queue a delete task if authentication failed as initiator
187 */
188 static status_t send_delete(private_aggressive_mode_t *this)
189 {
190 this->ike_sa->queue_task(this->ike_sa,
191 (task_t*)isakmp_delete_create(this->ike_sa, TRUE));
192 /* cancel all active tasks in favour of informational */
193 this->ike_sa->flush_queue(this->ike_sa,
194 this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
195 return ALREADY_DONE;
196 }
197
198 METHOD(task_t, build_i, status_t,
199 private_aggressive_mode_t *this, message_t *message)
200 {
201 switch (this->state)
202 {
203 case AM_INIT:
204 {
205 sa_payload_t *sa_payload;
206 id_payload_t *id_payload;
207 linked_list_t *proposals;
208 identification_t *id;
209 packet_t *packet;
210 u_int16_t group;
211
212 DBG0(DBG_IKE, "initiating Aggressive Mode IKE_SA %s[%d] to %H",
213 this->ike_sa->get_name(this->ike_sa),
214 this->ike_sa->get_unique_id(this->ike_sa),
215 this->ike_sa->get_other_host(this->ike_sa));
216 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
217
218 this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
219 this->peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
220 this->peer_cfg->get_ref(this->peer_cfg);
221
222 this->method = this->ph1->get_auth_method(this->ph1, this->peer_cfg);
223 if (this->method == AUTH_NONE)
224 {
225 DBG1(DBG_CFG, "configuration uses unsupported authentication");
226 return FAILED;
227 }
228 this->lifetime = this->peer_cfg->get_reauth_time(this->peer_cfg,
229 FALSE);
230 if (!this->lifetime)
231 { /* fall back to rekey time of no rekey time configured */
232 this->lifetime = this->peer_cfg->get_rekey_time(this->peer_cfg,
233 FALSE);
234 }
235 this->lifetime += this->peer_cfg->get_over_time(this->peer_cfg);
236 proposals = this->ike_cfg->get_proposals(this->ike_cfg);
237 sa_payload = sa_payload_create_from_proposals_v1(proposals,
238 this->lifetime, 0, this->method, MODE_NONE, FALSE, 0);
239 proposals->destroy_offset(proposals, offsetof(proposal_t, destroy));
240
241 message->add_payload(message, &sa_payload->payload_interface);
242
243 group = this->ike_cfg->get_dh_group(this->ike_cfg);
244 if (group == MODP_NONE)
245 {
246 DBG1(DBG_IKE, "DH group selection failed");
247 return FAILED;
248 }
249 if (!this->ph1->create_dh(this->ph1, group))
250 {
251 DBG1(DBG_IKE, "DH group %N not supported",
252 diffie_hellman_group_names, group);
253 return FAILED;
254 }
255 if (!this->ph1->add_nonce_ke(this->ph1, message))
256 {
257 return FAILED;
258 }
259 id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
260 if (!id)
261 {
262 DBG1(DBG_CFG, "own identity not known");
263 return FAILED;
264 }
265 this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
266 id_payload = id_payload_create_from_identification(ID_V1, id);
267 this->id_data = id_payload->get_encoded(id_payload);
268 message->add_payload(message, &id_payload->payload_interface);
269
270 /* pregenerate message to store SA payload */
271 if (this->ike_sa->generate_message(this->ike_sa, message,
272 &packet) != SUCCESS)
273 {
274 DBG1(DBG_IKE, "pregenerating SA payload failed");
275 return FAILED;
276 }
277 packet->destroy(packet);
278 if (!this->ph1->save_sa_payload(this->ph1, message))
279 {
280 DBG1(DBG_IKE, "SA payload invalid");
281 return FAILED;
282 }
283 this->state = AM_AUTH;
284 return NEED_MORE;
285 }
286 case AM_AUTH:
287 {
288 if (!this->ph1->build_auth(this->ph1, this->method, message,
289 this->id_data))
290 {
291 this->id_data = chunk_empty;
292 return send_notify(this, AUTHENTICATION_FAILED);
293 }
294 this->id_data = chunk_empty;
295
296 switch (this->method)
297 {
298 case AUTH_XAUTH_INIT_PSK:
299 case AUTH_XAUTH_INIT_RSA:
300 case AUTH_HYBRID_INIT_RSA:
301 /* wait for XAUTH request */
302 break;
303 case AUTH_XAUTH_RESP_PSK:
304 case AUTH_XAUTH_RESP_RSA:
305 case AUTH_HYBRID_RESP_RSA:
306 /* TODO-IKEv1: not yet */
307 return FAILED;
308 default:
309 if (charon->ike_sa_manager->check_uniqueness(
310 charon->ike_sa_manager, this->ike_sa, FALSE))
311 {
312 DBG1(DBG_IKE, "cancelling Aggressive Mode due to "
313 "uniqueness policy");
314 return send_notify(this, AUTHENTICATION_FAILED);
315 }
316 if (!establish(this))
317 {
318 return send_notify(this, AUTHENTICATION_FAILED);
319 }
320 break;
321 }
322 if (this->peer_cfg->get_virtual_ip(this->peer_cfg))
323 {
324 this->ike_sa->queue_task(this->ike_sa,
325 (task_t*)mode_config_create(this->ike_sa, TRUE));
326 }
327 return SUCCESS;
328 }
329 default:
330 return FAILED;
331 }
332 }
333
334 METHOD(task_t, process_r, status_t,
335 private_aggressive_mode_t *this, message_t *message)
336 {
337 switch (this->state)
338 {
339 case AM_INIT:
340 {
341 sa_payload_t *sa_payload;
342 id_payload_t *id_payload;
343 identification_t *id;
344 linked_list_t *list;
345 u_int16_t group;
346
347 this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
348 DBG0(DBG_IKE, "%H is initiating a Aggressive Mode IKE_SA",
349 message->get_source(message));
350 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
351
352 this->ike_sa->update_hosts(this->ike_sa,
353 message->get_destination(message),
354 message->get_source(message), TRUE);
355
356 sa_payload = (sa_payload_t*)message->get_payload(message,
357 SECURITY_ASSOCIATION_V1);
358 if (!sa_payload)
359 {
360 DBG1(DBG_IKE, "SA payload missing");
361 return send_notify(this, INVALID_PAYLOAD_TYPE);
362 }
363 if (!this->ph1->save_sa_payload(this->ph1, message))
364 {
365 return send_notify(this, INVALID_PAYLOAD_TYPE);
366 }
367
368 list = sa_payload->get_proposals(sa_payload);
369 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
370 list, FALSE);
371 list->destroy_offset(list, offsetof(proposal_t, destroy));
372 if (!this->proposal)
373 {
374 DBG1(DBG_IKE, "no proposal found");
375 return send_notify(this, NO_PROPOSAL_CHOSEN);
376 }
377 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
378
379 this->method = sa_payload->get_auth_method(sa_payload);
380 this->lifetime = sa_payload->get_lifetime(sa_payload);
381
382 switch (this->method)
383 {
384 case AUTH_XAUTH_INIT_PSK:
385 case AUTH_XAUTH_RESP_PSK:
386 case AUTH_PSK:
387 if (!lib->settings->get_bool(lib->settings, "charon.i_dont_"
388 "care_about_security_and_use_aggressive_mode_psk", FALSE))
389 {
390 DBG1(DBG_IKE, "Aggressive Mode PSK disabled for "
391 "security reasons");
392 return send_notify(this, AUTHENTICATION_FAILED);
393 }
394 break;
395 default:
396 break;
397 }
398
399 if (!this->proposal->get_algorithm(this->proposal,
400 DIFFIE_HELLMAN_GROUP, &group, NULL))
401 {
402 DBG1(DBG_IKE, "DH group selection failed");
403 return send_notify(this, INVALID_KEY_INFORMATION);
404 }
405 if (!this->ph1->create_dh(this->ph1, group))
406 {
407 DBG1(DBG_IKE, "negotiated DH group not supported");
408 return send_notify(this, INVALID_KEY_INFORMATION);
409 }
410 if (!this->ph1->get_nonce_ke(this->ph1, message))
411 {
412 return send_notify(this, INVALID_PAYLOAD_TYPE);
413 }
414
415 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
416 if (!id_payload)
417 {
418 DBG1(DBG_IKE, "IDii payload missing");
419 return send_notify(this, INVALID_PAYLOAD_TYPE);
420 }
421
422 id = id_payload->get_identification(id_payload);
423 this->id_data = id_payload->get_encoded(id_payload);
424 this->ike_sa->set_other_id(this->ike_sa, id);
425 this->peer_cfg = this->ph1->select_config(this->ph1,
426 this->method, TRUE, id);
427 if (!this->peer_cfg)
428 {
429 return send_notify(this, AUTHENTICATION_FAILED);
430 }
431 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
432
433 this->state = AM_AUTH;
434 if (has_notify_errors(this, message))
435 {
436 return FAILED;
437 }
438 return NEED_MORE;
439 }
440 case AM_AUTH:
441 {
442 while (TRUE)
443 {
444 if (this->ph1->verify_auth(this->ph1, this->method, message,
445 this->id_data))
446 {
447 break;
448 }
449 this->peer_cfg->destroy(this->peer_cfg);
450 this->peer_cfg = this->ph1->select_config(this->ph1,
451 this->method, TRUE, NULL);
452 if (!this->peer_cfg)
453 {
454 this->id_data = chunk_empty;
455 return send_delete(this);
456 }
457 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
458 }
459 this->id_data = chunk_empty;
460
461 if (!charon->bus->authorize(charon->bus, FALSE))
462 {
463 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids "
464 "IKE_SA, cancelling");
465 return send_delete(this);
466 }
467
468 switch (this->method)
469 {
470 case AUTH_XAUTH_INIT_PSK:
471 case AUTH_XAUTH_INIT_RSA:
472 case AUTH_HYBRID_INIT_RSA:
473 this->ike_sa->queue_task(this->ike_sa,
474 (task_t*)xauth_create(this->ike_sa, TRUE));
475 return SUCCESS;
476 case AUTH_XAUTH_RESP_PSK:
477 case AUTH_XAUTH_RESP_RSA:
478 case AUTH_HYBRID_RESP_RSA:
479 /* TODO-IKEv1: not yet supported */
480 return FAILED;
481 default:
482 if (charon->ike_sa_manager->check_uniqueness(
483 charon->ike_sa_manager, this->ike_sa, FALSE))
484 {
485 DBG1(DBG_IKE, "cancelling Aggressive Mode due to "
486 "uniqueness policy");
487 return send_delete(this);
488 }
489 if (!establish(this))
490 {
491 return send_delete(this);
492 }
493 lib->processor->queue_job(lib->processor, (job_t*)
494 adopt_children_job_create(
495 this->ike_sa->get_id(this->ike_sa)));
496 return SUCCESS;
497 }
498 }
499 default:
500 return FAILED;
501 }
502 }
503
504 METHOD(task_t, build_r, status_t,
505 private_aggressive_mode_t *this, message_t *message)
506 {
507 if (this->state == AM_AUTH)
508 {
509 sa_payload_t *sa_payload;
510 id_payload_t *id_payload;
511 identification_t *id;
512
513 sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
514 this->lifetime, 0, this->method, MODE_NONE, FALSE, 0);
515 message->add_payload(message, &sa_payload->payload_interface);
516
517 if (!this->ph1->add_nonce_ke(this->ph1, message))
518 {
519 return send_notify(this, INVALID_KEY_INFORMATION);
520 }
521 if (!this->ph1->create_hasher(this->ph1))
522 {
523 return send_notify(this, NO_PROPOSAL_CHOSEN);
524 }
525 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
526 {
527 return send_notify(this, INVALID_KEY_INFORMATION);
528 }
529
530 id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
531 if (!id)
532 {
533 DBG1(DBG_CFG, "own identity not known");
534 return send_notify(this, INVALID_ID_INFORMATION);
535 }
536 this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
537
538 id_payload = id_payload_create_from_identification(ID_V1, id);
539 message->add_payload(message, &id_payload->payload_interface);
540
541 if (!this->ph1->build_auth(this->ph1, this->method, message,
542 id_payload->get_encoded(id_payload)))
543 {
544 return send_notify(this, AUTHENTICATION_FAILED);
545 }
546 return NEED_MORE;
547 }
548 return FAILED;
549 }
550
551 METHOD(task_t, process_i, status_t,
552 private_aggressive_mode_t *this, message_t *message)
553 {
554 if (this->state == AM_AUTH)
555 {
556 auth_method_t method;
557 sa_payload_t *sa_payload;
558 id_payload_t *id_payload;
559 identification_t *id, *cid;
560 linked_list_t *list;
561 u_int32_t lifetime;
562
563 sa_payload = (sa_payload_t*)message->get_payload(message,
564 SECURITY_ASSOCIATION_V1);
565 if (!sa_payload)
566 {
567 DBG1(DBG_IKE, "SA payload missing");
568 return send_notify(this, INVALID_PAYLOAD_TYPE);
569 }
570 list = sa_payload->get_proposals(sa_payload);
571 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
572 list, FALSE);
573 list->destroy_offset(list, offsetof(proposal_t, destroy));
574 if (!this->proposal)
575 {
576 DBG1(DBG_IKE, "no proposal found");
577 return send_notify(this, NO_PROPOSAL_CHOSEN);
578 }
579 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
580
581 lifetime = sa_payload->get_lifetime(sa_payload);
582 if (lifetime != this->lifetime)
583 {
584 DBG1(DBG_IKE, "received lifetime %us does not match configured "
585 "lifetime %us", lifetime, this->lifetime);
586 }
587 this->lifetime = lifetime;
588 method = sa_payload->get_auth_method(sa_payload);
589 if (method != this->method)
590 {
591 DBG1(DBG_IKE, "received %N authentication, but configured %N, "
592 "continue with configured", auth_method_names, method,
593 auth_method_names, this->method);
594 }
595 if (!this->ph1->get_nonce_ke(this->ph1, message))
596 {
597 return send_notify(this, INVALID_PAYLOAD_TYPE);
598 }
599 if (!this->ph1->create_hasher(this->ph1))
600 {
601 return send_notify(this, NO_PROPOSAL_CHOSEN);
602 }
603
604 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
605 if (!id_payload)
606 {
607 DBG1(DBG_IKE, "IDir payload missing");
608 return send_delete(this);
609 }
610 id = id_payload->get_identification(id_payload);
611 cid = this->ph1->get_id(this->ph1, this->peer_cfg, FALSE);
612 if (cid && !id->matches(id, cid))
613 {
614 DBG1(DBG_IKE, "IDir '%Y' does not match to '%Y'", id, cid);
615 id->destroy(id);
616 return send_notify(this, INVALID_ID_INFORMATION);
617 }
618 this->ike_sa->set_other_id(this->ike_sa, id);
619
620 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
621 {
622 return send_notify(this, INVALID_KEY_INFORMATION);
623 }
624 if (!this->ph1->verify_auth(this->ph1, this->method, message,
625 id_payload->get_encoded(id_payload)))
626 {
627 return send_notify(this, AUTHENTICATION_FAILED);
628 }
629 if (!charon->bus->authorize(charon->bus, FALSE))
630 {
631 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids IKE_SA, "
632 "cancelling");
633 return send_notify(this, AUTHENTICATION_FAILED);
634 }
635
636 return NEED_MORE;
637 }
638 return FAILED;
639 }
640
641 METHOD(task_t, get_type, task_type_t,
642 private_aggressive_mode_t *this)
643 {
644 return TASK_AGGRESSIVE_MODE;
645 }
646
647 METHOD(task_t, migrate, void,
648 private_aggressive_mode_t *this, ike_sa_t *ike_sa)
649 {
650 DESTROY_IF(this->peer_cfg);
651 DESTROY_IF(this->proposal);
652 this->ph1->destroy(this->ph1);
653 chunk_free(&this->id_data);
654
655 this->ike_sa = ike_sa;
656 this->state = AM_INIT;
657 this->peer_cfg = NULL;
658 this->proposal = NULL;
659 this->ph1 = phase1_create(ike_sa, this->initiator);
660 }
661
662 METHOD(task_t, destroy, void,
663 private_aggressive_mode_t *this)
664 {
665 DESTROY_IF(this->peer_cfg);
666 DESTROY_IF(this->proposal);
667 this->ph1->destroy(this->ph1);
668 chunk_free(&this->id_data);
669 free(this);
670 }
671
672 /*
673 * Described in header.
674 */
675 aggressive_mode_t *aggressive_mode_create(ike_sa_t *ike_sa, bool initiator)
676 {
677 private_aggressive_mode_t *this;
678
679 INIT(this,
680 .public = {
681 .task = {
682 .get_type = _get_type,
683 .migrate = _migrate,
684 .destroy = _destroy,
685 },
686 },
687 .ike_sa = ike_sa,
688 .ph1 = phase1_create(ike_sa, initiator),
689 .initiator = initiator,
690 .state = AM_INIT,
691 );
692
693 if (initiator)
694 {
695 this->public.task.build = _build_i;
696 this->public.task.process = _process_i;
697 }
698 else
699 {
700 this->public.task.build = _build_r;
701 this->public.task.process = _process_r;
702 }
703
704 return &this->public;
705 }