Switch to alternative peer config in IKEv1 Main and Aggressive Mode.
[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);
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 (!establish(this))
310 {
311 return send_notify(this, AUTHENTICATION_FAILED);
312 }
313 break;
314 }
315 if (this->peer_cfg->get_virtual_ip(this->peer_cfg))
316 {
317 this->ike_sa->queue_task(this->ike_sa,
318 (task_t*)mode_config_create(this->ike_sa, TRUE));
319 }
320 return SUCCESS;
321 }
322 default:
323 return FAILED;
324 }
325 }
326
327 METHOD(task_t, process_r, status_t,
328 private_aggressive_mode_t *this, message_t *message)
329 {
330 switch (this->state)
331 {
332 case AM_INIT:
333 {
334 sa_payload_t *sa_payload;
335 id_payload_t *id_payload;
336 identification_t *id;
337 linked_list_t *list;
338 u_int16_t group;
339
340 this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
341 DBG0(DBG_IKE, "%H is initiating a Aggressive Mode IKE_SA",
342 message->get_source(message));
343 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
344
345 this->ike_sa->update_hosts(this->ike_sa,
346 message->get_destination(message),
347 message->get_source(message), TRUE);
348
349 sa_payload = (sa_payload_t*)message->get_payload(message,
350 SECURITY_ASSOCIATION_V1);
351 if (!sa_payload)
352 {
353 DBG1(DBG_IKE, "SA payload missing");
354 return send_notify(this, INVALID_PAYLOAD_TYPE);
355 }
356 if (!this->ph1->save_sa_payload(this->ph1, message))
357 {
358 return send_notify(this, INVALID_PAYLOAD_TYPE);
359 }
360
361 list = sa_payload->get_proposals(sa_payload);
362 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
363 list, FALSE);
364 list->destroy_offset(list, offsetof(proposal_t, destroy));
365 if (!this->proposal)
366 {
367 DBG1(DBG_IKE, "no proposal found");
368 return send_notify(this, NO_PROPOSAL_CHOSEN);
369 }
370 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
371
372 this->method = sa_payload->get_auth_method(sa_payload);
373 this->lifetime = sa_payload->get_lifetime(sa_payload);
374
375 if (!this->proposal->get_algorithm(this->proposal,
376 DIFFIE_HELLMAN_GROUP, &group, NULL))
377 {
378 DBG1(DBG_IKE, "DH group selection failed");
379 return send_notify(this, INVALID_KEY_INFORMATION);
380 }
381 if (!this->ph1->create_dh(this->ph1, group))
382 {
383 DBG1(DBG_IKE, "negotiated DH group not supported");
384 return send_notify(this, INVALID_KEY_INFORMATION);
385 }
386 if (!this->ph1->get_nonce_ke(this->ph1, message))
387 {
388 return send_notify(this, INVALID_PAYLOAD_TYPE);
389 }
390
391 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
392 if (!id_payload)
393 {
394 DBG1(DBG_IKE, "IDii payload missing");
395 return send_notify(this, INVALID_PAYLOAD_TYPE);
396 }
397
398 id = id_payload->get_identification(id_payload);
399 this->id_data = id_payload->get_encoded(id_payload);
400 this->ike_sa->set_other_id(this->ike_sa, id);
401 this->peer_cfg = this->ph1->select_config(this->ph1,
402 this->method, TRUE, id);
403 if (!this->peer_cfg)
404 {
405 return send_notify(this, AUTHENTICATION_FAILED);
406 }
407 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
408
409 this->state = AM_AUTH;
410 if (has_notify_errors(this, message))
411 {
412 return FAILED;
413 }
414 return NEED_MORE;
415 }
416 case AM_AUTH:
417 {
418 while (TRUE)
419 {
420 if (this->ph1->verify_auth(this->ph1, this->method, message,
421 this->id_data))
422 {
423 break;
424 }
425 this->peer_cfg->destroy(this->peer_cfg);
426 this->peer_cfg = this->ph1->select_config(this->ph1,
427 this->method, TRUE, NULL);
428 if (!this->peer_cfg)
429 {
430 this->id_data = chunk_empty;
431 return send_delete(this);
432 }
433 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
434 }
435 this->id_data = chunk_empty;
436
437 if (!charon->bus->authorize(charon->bus, FALSE))
438 {
439 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids "
440 "IKE_SA, cancelling");
441 return send_delete(this);
442 }
443
444 switch (this->method)
445 {
446 case AUTH_XAUTH_INIT_PSK:
447 case AUTH_XAUTH_INIT_RSA:
448 case AUTH_HYBRID_INIT_RSA:
449 this->ike_sa->queue_task(this->ike_sa,
450 (task_t*)xauth_create(this->ike_sa, TRUE));
451 return SUCCESS;
452 case AUTH_XAUTH_RESP_PSK:
453 case AUTH_XAUTH_RESP_RSA:
454 case AUTH_HYBRID_RESP_RSA:
455 /* TODO-IKEv1: not yet supported */
456 return FAILED;
457 default:
458 if (!establish(this))
459 {
460 return send_delete(this);
461 }
462 lib->processor->queue_job(lib->processor, (job_t*)
463 adopt_children_job_create(
464 this->ike_sa->get_id(this->ike_sa)));
465 return SUCCESS;
466 }
467 }
468 default:
469 return FAILED;
470 }
471 }
472
473 METHOD(task_t, build_r, status_t,
474 private_aggressive_mode_t *this, message_t *message)
475 {
476 if (this->state == AM_AUTH)
477 {
478 sa_payload_t *sa_payload;
479 id_payload_t *id_payload;
480 identification_t *id;
481
482 sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
483 this->lifetime, 0, this->method, MODE_NONE, FALSE);
484 message->add_payload(message, &sa_payload->payload_interface);
485
486 if (!this->ph1->add_nonce_ke(this->ph1, message))
487 {
488 return send_notify(this, INVALID_KEY_INFORMATION);
489 }
490 if (!this->ph1->create_hasher(this->ph1))
491 {
492 return send_notify(this, NO_PROPOSAL_CHOSEN);
493 }
494 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
495 {
496 return send_notify(this, INVALID_KEY_INFORMATION);
497 }
498
499 id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
500 if (!id)
501 {
502 DBG1(DBG_CFG, "own identity not known");
503 return send_notify(this, INVALID_ID_INFORMATION);
504 }
505 this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
506
507 id_payload = id_payload_create_from_identification(ID_V1, id);
508 message->add_payload(message, &id_payload->payload_interface);
509
510 if (!this->ph1->build_auth(this->ph1, this->method, message,
511 id_payload->get_encoded(id_payload)))
512 {
513 return send_notify(this, AUTHENTICATION_FAILED);
514 }
515 return NEED_MORE;
516 }
517 return FAILED;
518 }
519
520 METHOD(task_t, process_i, status_t,
521 private_aggressive_mode_t *this, message_t *message)
522 {
523 if (this->state == AM_AUTH)
524 {
525 auth_method_t method;
526 sa_payload_t *sa_payload;
527 id_payload_t *id_payload;
528 identification_t *id, *cid;
529 linked_list_t *list;
530 u_int32_t lifetime;
531
532 sa_payload = (sa_payload_t*)message->get_payload(message,
533 SECURITY_ASSOCIATION_V1);
534 if (!sa_payload)
535 {
536 DBG1(DBG_IKE, "SA payload missing");
537 return send_notify(this, INVALID_PAYLOAD_TYPE);
538 }
539 list = sa_payload->get_proposals(sa_payload);
540 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
541 list, FALSE);
542 list->destroy_offset(list, offsetof(proposal_t, destroy));
543 if (!this->proposal)
544 {
545 DBG1(DBG_IKE, "no proposal found");
546 return send_notify(this, NO_PROPOSAL_CHOSEN);
547 }
548 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
549
550 lifetime = sa_payload->get_lifetime(sa_payload);
551 if (lifetime != this->lifetime)
552 {
553 DBG1(DBG_IKE, "received lifetime %us does not match configured "
554 "lifetime %us", lifetime, this->lifetime);
555 }
556 this->lifetime = lifetime;
557 method = sa_payload->get_auth_method(sa_payload);
558 if (method != this->method)
559 {
560 DBG1(DBG_IKE, "received %N authentication, but configured %N, "
561 "continue with configured", auth_method_names, method,
562 auth_method_names, this->method);
563 }
564 if (!this->ph1->get_nonce_ke(this->ph1, message))
565 {
566 return send_notify(this, INVALID_PAYLOAD_TYPE);
567 }
568 if (!this->ph1->create_hasher(this->ph1))
569 {
570 return send_notify(this, NO_PROPOSAL_CHOSEN);
571 }
572 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
573 {
574 return send_notify(this, INVALID_KEY_INFORMATION);
575 }
576
577 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
578 if (!id_payload)
579 {
580 DBG1(DBG_IKE, "IDir payload missing");
581 return send_delete(this);
582 }
583 id = id_payload->get_identification(id_payload);
584 cid = this->ph1->get_id(this->ph1, this->peer_cfg, FALSE);
585 if (cid && !id->matches(id, cid))
586 {
587 DBG1(DBG_IKE, "IDir '%Y' does not match to '%Y'", id, cid);
588 id->destroy(id);
589 return send_notify(this, INVALID_ID_INFORMATION);
590 }
591 this->ike_sa->set_other_id(this->ike_sa, id);
592
593 if (!this->ph1->verify_auth(this->ph1, this->method, message,
594 id_payload->get_encoded(id_payload)))
595 {
596 return send_notify(this, AUTHENTICATION_FAILED);
597 }
598 if (!charon->bus->authorize(charon->bus, FALSE))
599 {
600 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids IKE_SA, "
601 "cancelling");
602 return send_notify(this, AUTHENTICATION_FAILED);
603 }
604
605 return NEED_MORE;
606 }
607 return FAILED;
608 }
609
610 METHOD(task_t, get_type, task_type_t,
611 private_aggressive_mode_t *this)
612 {
613 return TASK_AGGRESSIVE_MODE;
614 }
615
616 METHOD(task_t, migrate, void,
617 private_aggressive_mode_t *this, ike_sa_t *ike_sa)
618 {
619 DESTROY_IF(this->peer_cfg);
620 DESTROY_IF(this->proposal);
621 this->ph1->destroy(this->ph1);
622 chunk_free(&this->id_data);
623
624 this->ike_sa = ike_sa;
625 this->state = AM_INIT;
626 this->peer_cfg = NULL;
627 this->proposal = NULL;
628 this->ph1 = phase1_create(ike_sa, this->initiator);
629 }
630
631 METHOD(task_t, destroy, void,
632 private_aggressive_mode_t *this)
633 {
634 DESTROY_IF(this->peer_cfg);
635 DESTROY_IF(this->proposal);
636 this->ph1->destroy(this->ph1);
637 chunk_free(&this->id_data);
638 free(this);
639 }
640
641 /*
642 * Described in header.
643 */
644 aggressive_mode_t *aggressive_mode_create(ike_sa_t *ike_sa, bool initiator)
645 {
646 private_aggressive_mode_t *this;
647
648 INIT(this,
649 .public = {
650 .task = {
651 .get_type = _get_type,
652 .migrate = _migrate,
653 .destroy = _destroy,
654 },
655 },
656 .ike_sa = ike_sa,
657 .ph1 = phase1_create(ike_sa, initiator),
658 .initiator = initiator,
659 .state = AM_INIT,
660 );
661
662 if (initiator)
663 {
664 this->public.task.build = _build_i;
665 this->public.task.process = _process_i;
666 }
667 else
668 {
669 this->public.task.build = _build_r;
670 this->public.task.process = _process_r;
671 }
672
673 return &this->public;
674 }