Require a scary option to respond to Aggressive Mode PSK requests
[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 if (charon->ike_sa_manager->check_uniqueness(charon->ike_sa_manager,
297 this->ike_sa, FALSE))
298 {
299 DBG1(DBG_IKE, "cancelling Aggressive Mode due to uniqueness "
300 "policy");
301 return send_notify(this, AUTHENTICATION_FAILED);
302 }
303
304 switch (this->method)
305 {
306 case AUTH_XAUTH_INIT_PSK:
307 case AUTH_XAUTH_INIT_RSA:
308 case AUTH_HYBRID_INIT_RSA:
309 /* wait for XAUTH request */
310 break;
311 case AUTH_XAUTH_RESP_PSK:
312 case AUTH_XAUTH_RESP_RSA:
313 case AUTH_HYBRID_RESP_RSA:
314 /* TODO-IKEv1: not yet */
315 return FAILED;
316 default:
317 if (!establish(this))
318 {
319 return send_notify(this, AUTHENTICATION_FAILED);
320 }
321 break;
322 }
323 if (this->peer_cfg->get_virtual_ip(this->peer_cfg))
324 {
325 this->ike_sa->queue_task(this->ike_sa,
326 (task_t*)mode_config_create(this->ike_sa, TRUE));
327 }
328 return SUCCESS;
329 }
330 default:
331 return FAILED;
332 }
333 }
334
335 METHOD(task_t, process_r, status_t,
336 private_aggressive_mode_t *this, message_t *message)
337 {
338 switch (this->state)
339 {
340 case AM_INIT:
341 {
342 sa_payload_t *sa_payload;
343 id_payload_t *id_payload;
344 identification_t *id;
345 linked_list_t *list;
346 u_int16_t group;
347
348 this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
349 DBG0(DBG_IKE, "%H is initiating a Aggressive Mode IKE_SA",
350 message->get_source(message));
351 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
352
353 this->ike_sa->update_hosts(this->ike_sa,
354 message->get_destination(message),
355 message->get_source(message), TRUE);
356
357 sa_payload = (sa_payload_t*)message->get_payload(message,
358 SECURITY_ASSOCIATION_V1);
359 if (!sa_payload)
360 {
361 DBG1(DBG_IKE, "SA payload missing");
362 return send_notify(this, INVALID_PAYLOAD_TYPE);
363 }
364 if (!this->ph1->save_sa_payload(this->ph1, message))
365 {
366 return send_notify(this, INVALID_PAYLOAD_TYPE);
367 }
368
369 list = sa_payload->get_proposals(sa_payload);
370 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
371 list, FALSE);
372 list->destroy_offset(list, offsetof(proposal_t, destroy));
373 if (!this->proposal)
374 {
375 DBG1(DBG_IKE, "no proposal found");
376 return send_notify(this, NO_PROPOSAL_CHOSEN);
377 }
378 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
379
380 this->method = sa_payload->get_auth_method(sa_payload);
381 this->lifetime = sa_payload->get_lifetime(sa_payload);
382
383 switch (this->method)
384 {
385 case AUTH_XAUTH_INIT_PSK:
386 case AUTH_XAUTH_RESP_PSK:
387 case AUTH_PSK:
388 if (!lib->settings->get_bool(lib->settings, "charon.i_dont_"
389 "care_about_security_and_use_aggressive_mode_psk", FALSE))
390 {
391 DBG1(DBG_IKE, "Aggressive Mode PSK disabled for "
392 "security reasons");
393 return send_notify(this, AUTHENTICATION_FAILED);
394 }
395 break;
396 default:
397 break;
398 }
399
400 if (!this->proposal->get_algorithm(this->proposal,
401 DIFFIE_HELLMAN_GROUP, &group, NULL))
402 {
403 DBG1(DBG_IKE, "DH group selection failed");
404 return send_notify(this, INVALID_KEY_INFORMATION);
405 }
406 if (!this->ph1->create_dh(this->ph1, group))
407 {
408 DBG1(DBG_IKE, "negotiated DH group not supported");
409 return send_notify(this, INVALID_KEY_INFORMATION);
410 }
411 if (!this->ph1->get_nonce_ke(this->ph1, message))
412 {
413 return send_notify(this, INVALID_PAYLOAD_TYPE);
414 }
415
416 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
417 if (!id_payload)
418 {
419 DBG1(DBG_IKE, "IDii payload missing");
420 return send_notify(this, INVALID_PAYLOAD_TYPE);
421 }
422
423 id = id_payload->get_identification(id_payload);
424 this->id_data = id_payload->get_encoded(id_payload);
425 this->ike_sa->set_other_id(this->ike_sa, id);
426 this->peer_cfg = this->ph1->select_config(this->ph1,
427 this->method, TRUE, id);
428 if (!this->peer_cfg)
429 {
430 return send_notify(this, AUTHENTICATION_FAILED);
431 }
432 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
433
434 this->state = AM_AUTH;
435 if (has_notify_errors(this, message))
436 {
437 return FAILED;
438 }
439 return NEED_MORE;
440 }
441 case AM_AUTH:
442 {
443 while (TRUE)
444 {
445 if (this->ph1->verify_auth(this->ph1, this->method, message,
446 this->id_data))
447 {
448 break;
449 }
450 this->peer_cfg->destroy(this->peer_cfg);
451 this->peer_cfg = this->ph1->select_config(this->ph1,
452 this->method, TRUE, NULL);
453 if (!this->peer_cfg)
454 {
455 this->id_data = chunk_empty;
456 return send_delete(this);
457 }
458 this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
459 }
460 this->id_data = chunk_empty;
461
462 if (!charon->bus->authorize(charon->bus, FALSE))
463 {
464 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids "
465 "IKE_SA, cancelling");
466 return send_delete(this);
467 }
468
469 if (charon->ike_sa_manager->check_uniqueness(charon->ike_sa_manager,
470 this->ike_sa, FALSE))
471 {
472 DBG1(DBG_IKE, "cancelling Aggressive Mode due to uniqueness "
473 "policy");
474 return send_delete(this);
475 }
476
477 switch (this->method)
478 {
479 case AUTH_XAUTH_INIT_PSK:
480 case AUTH_XAUTH_INIT_RSA:
481 case AUTH_HYBRID_INIT_RSA:
482 this->ike_sa->queue_task(this->ike_sa,
483 (task_t*)xauth_create(this->ike_sa, TRUE));
484 return SUCCESS;
485 case AUTH_XAUTH_RESP_PSK:
486 case AUTH_XAUTH_RESP_RSA:
487 case AUTH_HYBRID_RESP_RSA:
488 /* TODO-IKEv1: not yet supported */
489 return FAILED;
490 default:
491 if (!establish(this))
492 {
493 return send_delete(this);
494 }
495 lib->processor->queue_job(lib->processor, (job_t*)
496 adopt_children_job_create(
497 this->ike_sa->get_id(this->ike_sa)));
498 return SUCCESS;
499 }
500 }
501 default:
502 return FAILED;
503 }
504 }
505
506 METHOD(task_t, build_r, status_t,
507 private_aggressive_mode_t *this, message_t *message)
508 {
509 if (this->state == AM_AUTH)
510 {
511 sa_payload_t *sa_payload;
512 id_payload_t *id_payload;
513 identification_t *id;
514
515 sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
516 this->lifetime, 0, this->method, MODE_NONE, FALSE, 0);
517 message->add_payload(message, &sa_payload->payload_interface);
518
519 if (!this->ph1->add_nonce_ke(this->ph1, message))
520 {
521 return send_notify(this, INVALID_KEY_INFORMATION);
522 }
523 if (!this->ph1->create_hasher(this->ph1))
524 {
525 return send_notify(this, NO_PROPOSAL_CHOSEN);
526 }
527 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
528 {
529 return send_notify(this, INVALID_KEY_INFORMATION);
530 }
531
532 id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
533 if (!id)
534 {
535 DBG1(DBG_CFG, "own identity not known");
536 return send_notify(this, INVALID_ID_INFORMATION);
537 }
538 this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
539
540 id_payload = id_payload_create_from_identification(ID_V1, id);
541 message->add_payload(message, &id_payload->payload_interface);
542
543 if (!this->ph1->build_auth(this->ph1, this->method, message,
544 id_payload->get_encoded(id_payload)))
545 {
546 return send_notify(this, AUTHENTICATION_FAILED);
547 }
548 return NEED_MORE;
549 }
550 return FAILED;
551 }
552
553 METHOD(task_t, process_i, status_t,
554 private_aggressive_mode_t *this, message_t *message)
555 {
556 if (this->state == AM_AUTH)
557 {
558 auth_method_t method;
559 sa_payload_t *sa_payload;
560 id_payload_t *id_payload;
561 identification_t *id, *cid;
562 linked_list_t *list;
563 u_int32_t lifetime;
564
565 sa_payload = (sa_payload_t*)message->get_payload(message,
566 SECURITY_ASSOCIATION_V1);
567 if (!sa_payload)
568 {
569 DBG1(DBG_IKE, "SA payload missing");
570 return send_notify(this, INVALID_PAYLOAD_TYPE);
571 }
572 list = sa_payload->get_proposals(sa_payload);
573 this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
574 list, FALSE);
575 list->destroy_offset(list, offsetof(proposal_t, destroy));
576 if (!this->proposal)
577 {
578 DBG1(DBG_IKE, "no proposal found");
579 return send_notify(this, NO_PROPOSAL_CHOSEN);
580 }
581 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
582
583 lifetime = sa_payload->get_lifetime(sa_payload);
584 if (lifetime != this->lifetime)
585 {
586 DBG1(DBG_IKE, "received lifetime %us does not match configured "
587 "lifetime %us", lifetime, this->lifetime);
588 }
589 this->lifetime = lifetime;
590 method = sa_payload->get_auth_method(sa_payload);
591 if (method != this->method)
592 {
593 DBG1(DBG_IKE, "received %N authentication, but configured %N, "
594 "continue with configured", auth_method_names, method,
595 auth_method_names, this->method);
596 }
597 if (!this->ph1->get_nonce_ke(this->ph1, message))
598 {
599 return send_notify(this, INVALID_PAYLOAD_TYPE);
600 }
601 if (!this->ph1->create_hasher(this->ph1))
602 {
603 return send_notify(this, NO_PROPOSAL_CHOSEN);
604 }
605
606 id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
607 if (!id_payload)
608 {
609 DBG1(DBG_IKE, "IDir payload missing");
610 return send_delete(this);
611 }
612 id = id_payload->get_identification(id_payload);
613 cid = this->ph1->get_id(this->ph1, this->peer_cfg, FALSE);
614 if (cid && !id->matches(id, cid))
615 {
616 DBG1(DBG_IKE, "IDir '%Y' does not match to '%Y'", id, cid);
617 id->destroy(id);
618 return send_notify(this, INVALID_ID_INFORMATION);
619 }
620 this->ike_sa->set_other_id(this->ike_sa, id);
621
622 if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
623 {
624 return send_notify(this, INVALID_KEY_INFORMATION);
625 }
626 if (!this->ph1->verify_auth(this->ph1, this->method, message,
627 id_payload->get_encoded(id_payload)))
628 {
629 return send_notify(this, AUTHENTICATION_FAILED);
630 }
631 if (!charon->bus->authorize(charon->bus, FALSE))
632 {
633 DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids IKE_SA, "
634 "cancelling");
635 return send_notify(this, AUTHENTICATION_FAILED);
636 }
637
638 return NEED_MORE;
639 }
640 return FAILED;
641 }
642
643 METHOD(task_t, get_type, task_type_t,
644 private_aggressive_mode_t *this)
645 {
646 return TASK_AGGRESSIVE_MODE;
647 }
648
649 METHOD(task_t, migrate, void,
650 private_aggressive_mode_t *this, ike_sa_t *ike_sa)
651 {
652 DESTROY_IF(this->peer_cfg);
653 DESTROY_IF(this->proposal);
654 this->ph1->destroy(this->ph1);
655 chunk_free(&this->id_data);
656
657 this->ike_sa = ike_sa;
658 this->state = AM_INIT;
659 this->peer_cfg = NULL;
660 this->proposal = NULL;
661 this->ph1 = phase1_create(ike_sa, this->initiator);
662 }
663
664 METHOD(task_t, destroy, void,
665 private_aggressive_mode_t *this)
666 {
667 DESTROY_IF(this->peer_cfg);
668 DESTROY_IF(this->proposal);
669 this->ph1->destroy(this->ph1);
670 chunk_free(&this->id_data);
671 free(this);
672 }
673
674 /*
675 * Described in header.
676 */
677 aggressive_mode_t *aggressive_mode_create(ike_sa_t *ike_sa, bool initiator)
678 {
679 private_aggressive_mode_t *this;
680
681 INIT(this,
682 .public = {
683 .task = {
684 .get_type = _get_type,
685 .migrate = _migrate,
686 .destroy = _destroy,
687 },
688 },
689 .ike_sa = ike_sa,
690 .ph1 = phase1_create(ike_sa, initiator),
691 .initiator = initiator,
692 .state = AM_INIT,
693 );
694
695 if (initiator)
696 {
697 this->public.task.build = _build_i;
698 this->public.task.process = _process_i;
699 }
700 else
701 {
702 this->public.task.build = _build_r;
703 this->public.task.process = _process_r;
704 }
705
706 return &this->public;
707 }