d47efd73dc9d71f7945b605c84b9c97dfc6e5f16
[strongswan.git] / src / charon / sa / tasks / ike_auth.c
1 /**
2 * @file ike_auth.c
3 *
4 * @brief Implementation of the ike_auth task.
5 *
6 */
7
8 /*
9 * Copyright (C) 2005-2007 Martin Willi
10 * Copyright (C) 2005 Jan Hutter
11 * Hochschule fuer Technik Rapperswil
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
20 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * for more details.
22 */
23
24 #include "ike_auth.h"
25
26 #include <string.h>
27
28 #include <daemon.h>
29 #include <crypto/diffie_hellman.h>
30 #include <encoding/payloads/id_payload.h>
31 #include <encoding/payloads/auth_payload.h>
32 #include <encoding/payloads/eap_payload.h>
33 #include <encoding/payloads/nonce_payload.h>
34 #include <sa/authenticators/eap_authenticator.h>
35
36
37
38 typedef struct private_ike_auth_t private_ike_auth_t;
39
40 /**
41 * Private members of a ike_auth_t task.
42 */
43 struct private_ike_auth_t {
44
45 /**
46 * Public methods and task_t interface.
47 */
48 ike_auth_t public;
49
50 /**
51 * Assigned IKE_SA.
52 */
53 ike_sa_t *ike_sa;
54
55 /**
56 * Are we the initiator?
57 */
58 bool initiator;
59
60 /**
61 * Nonce chosen by us in ike_init
62 */
63 chunk_t my_nonce;
64
65 /**
66 * Nonce chosen by peer in ike_init
67 */
68 chunk_t other_nonce;
69
70 /**
71 * IKE_SA_INIT message sent by us
72 */
73 packet_t *my_packet;
74
75 /**
76 * IKE_SA_INIT message sent by peer
77 */
78 packet_t *other_packet;
79
80 /**
81 * EAP authenticator when using EAP
82 */
83 eap_authenticator_t *eap_auth;
84
85 /**
86 * EAP payload received and ready to process
87 */
88 eap_payload_t *eap_payload;
89
90 /**
91 * has the peer been authenticated successfully?
92 */
93 bool peer_authenticated;
94 };
95
96 /**
97 * build the AUTH payload
98 */
99 static status_t build_auth(private_ike_auth_t *this, message_t *message)
100 {
101 authenticator_t *auth;
102 auth_payload_t *auth_payload;
103 policy_t *policy;
104 auth_method_t method;
105 status_t status;
106
107 /* create own authenticator and add auth payload */
108 policy = this->ike_sa->get_policy(this->ike_sa);
109 if (!policy)
110 {
111 SIG(IKE_UP_FAILED, "unable to authenticate, no policy found");
112 return FAILED;
113 }
114 method = policy->get_auth_method(policy);
115
116 auth = authenticator_create(this->ike_sa, method);
117 if (auth == NULL)
118 {
119 SIG(IKE_UP_FAILED, "configured authentication method %N not supported",
120 auth_method_names, method);
121 return FAILED;
122 }
123
124 status = auth->build(auth, this->my_packet->get_data(this->my_packet),
125 this->other_nonce, &auth_payload);
126 auth->destroy(auth);
127 if (status != SUCCESS)
128 {
129 SIG(IKE_UP_FAILED, "generating authentication data failed");
130 return FAILED;
131 }
132 message->add_payload(message, (payload_t*)auth_payload);
133 return SUCCESS;
134 }
135
136 /**
137 * build ID payload(s)
138 */
139 static status_t build_id(private_ike_auth_t *this, message_t *message)
140 {
141 identification_t *me, *other;
142 id_payload_t *id;
143 policy_t *policy;
144
145 me = this->ike_sa->get_my_id(this->ike_sa);
146 other = this->ike_sa->get_other_id(this->ike_sa);
147 policy = this->ike_sa->get_policy(this->ike_sa);
148
149 if (me->contains_wildcards(me))
150 {
151 me = policy->get_my_id(policy);
152 if (me->contains_wildcards(me))
153 {
154 SIG(IKE_UP_FAILED, "negotiation of own ID failed");
155 return FAILED;
156 }
157 this->ike_sa->set_my_id(this->ike_sa, me->clone(me));
158 }
159
160 id = id_payload_create_from_identification(this->initiator, me);
161 message->add_payload(message, (payload_t*)id);
162
163 /* as initiator, include other ID if it does not contain wildcards */
164 if (this->initiator && !other->contains_wildcards(other))
165 {
166 id = id_payload_create_from_identification(FALSE, other);
167 message->add_payload(message, (payload_t*)id);
168 }
169 return SUCCESS;
170 }
171
172 /**
173 * process AUTH payload
174 */
175 static status_t process_auth(private_ike_auth_t *this, message_t *message)
176 {
177 auth_payload_t *auth_payload;
178 authenticator_t *auth;
179 auth_method_t auth_method;
180 status_t status;
181
182 auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
183
184 if (auth_payload == NULL)
185 {
186 /* AUTH payload is missing, client wants to use EAP authentication */
187 return NOT_FOUND;
188 }
189
190 auth_method = auth_payload->get_auth_method(auth_payload);
191 auth = authenticator_create(this->ike_sa, auth_method);
192
193 if (auth == NULL)
194 {
195 SIG(IKE_UP_FAILED, "authentication method %N used by %D not "
196 "supported", auth_method_names, auth_method,
197 this->ike_sa->get_other_id(this->ike_sa));
198 return NOT_SUPPORTED;
199 }
200 status = auth->verify(auth, this->other_packet->get_data(this->other_packet),
201 this->my_nonce, auth_payload);
202 auth->destroy(auth);
203 if (status != SUCCESS)
204 {
205 SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
206 this->ike_sa->get_other_id(this->ike_sa),
207 auth_method_names, auth_method);
208 return FAILED;
209 }
210 return SUCCESS;
211 }
212
213 /**
214 * process ID payload(s)
215 */
216 static status_t process_id(private_ike_auth_t *this, message_t *message)
217 {
218 identification_t *id;
219 id_payload_t *idr, *idi;
220
221 idi = (id_payload_t*)message->get_payload(message, ID_INITIATOR);
222 idr = (id_payload_t*)message->get_payload(message, ID_RESPONDER);
223
224 if ((this->initiator && idr == NULL) || (!this->initiator && idi == NULL))
225 {
226 SIG(IKE_UP_FAILED, "ID payload missing in message");
227 return FAILED;
228 }
229
230 if (this->initiator)
231 {
232 id = idr->get_identification(idr);
233 this->ike_sa->set_other_id(this->ike_sa, id);
234 }
235 else
236 {
237 id = idi->get_identification(idi);
238 this->ike_sa->set_other_id(this->ike_sa, id);
239 if (idr)
240 {
241 id = idr->get_identification(idr);
242 this->ike_sa->set_my_id(this->ike_sa, id);
243 }
244 }
245 return SUCCESS;
246 }
247
248 /**
249 * collect the needed information in the IKE_SA_INIT exchange from our message
250 */
251 static status_t collect_my_init_data(private_ike_auth_t *this, message_t *message)
252 {
253 nonce_payload_t *nonce;
254
255 /* get the nonce that was generated in ike_init */
256 nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
257 if (nonce == NULL)
258 {
259 return FAILED;
260 }
261 this->my_nonce = nonce->get_nonce(nonce);
262
263 /* pre-generate the message, so we can store it for us */
264 if (this->ike_sa->generate_message(this->ike_sa, message,
265 &this->my_packet) != SUCCESS)
266 {
267 return FAILED;
268 }
269 return NEED_MORE;
270 }
271
272 /**
273 * collect the needed information in the IKE_SA_INIT exchange from others message
274 */
275 static status_t collect_other_init_data(private_ike_auth_t *this, message_t *message)
276 {
277 /* we collect the needed information in the IKE_SA_INIT exchange */
278 nonce_payload_t *nonce;
279
280 /* get the nonce that was generated in ike_init */
281 nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
282 if (nonce == NULL)
283 {
284 return FAILED;
285 }
286 this->other_nonce = nonce->get_nonce(nonce);
287
288 /* pre-generate the message, so we can store it for us */
289 this->other_packet = message->get_packet(message);
290 return NEED_MORE;
291 }
292
293 /**
294 * Implementation of task_t.build to create AUTH payload from EAP data
295 */
296 static status_t build_auth_eap(private_ike_auth_t *this, message_t *message)
297 {
298 authenticator_t *auth;
299 auth_payload_t *auth_payload;
300
301 auth = (authenticator_t*)this->eap_auth;
302 if (auth->build(auth, this->my_packet->get_data(this->my_packet),
303 this->other_nonce, &auth_payload) != SUCCESS)
304 {
305 SIG(IKE_UP_FAILED, "generating authentication data failed");
306 if (!this->initiator)
307 {
308 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
309 }
310 return FAILED;
311 }
312 message->add_payload(message, (payload_t*)auth_payload);
313 if (this->initiator)
314 {
315 return NEED_MORE;
316 }
317 return SUCCESS;
318 }
319
320 /**
321 * Implementation of task_t.process to verify AUTH payload after EAP
322 */
323 static status_t process_auth_eap(private_ike_auth_t *this, message_t *message)
324 {
325 auth_payload_t *auth_payload;
326 authenticator_t *auth;
327
328 auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
329 this->peer_authenticated = FALSE;
330
331 if (auth_payload)
332 {
333 auth = (authenticator_t*)this->eap_auth;
334 if (auth->verify(auth, this->other_packet->get_data(this->other_packet),
335 this->my_nonce, auth_payload) == SUCCESS)
336 {
337 this->peer_authenticated = TRUE;
338 }
339 }
340
341 if (!this->peer_authenticated)
342 {
343 SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
344 this->ike_sa->get_other_id(this->ike_sa),
345 auth_method_names, AUTH_EAP);
346 if (this->initiator)
347 {
348 return FAILED;
349 }
350 return NEED_MORE;
351 }
352 if (this->initiator)
353 {
354 return SUCCESS;
355 }
356 return NEED_MORE;
357 }
358
359 /**
360 * Implementation of task_t.process for EAP exchanges
361 */
362 static status_t process_eap_i(private_ike_auth_t *this, message_t *message)
363 {
364 eap_payload_t *eap;
365
366 eap = (eap_payload_t*)message->get_payload(message, EXTENSIBLE_AUTHENTICATION);
367 if (eap == NULL)
368 {
369 SIG(IKE_UP_FAILED, "EAP payload missing");
370 return FAILED;
371 }
372 switch (this->eap_auth->process(this->eap_auth, eap, &eap))
373 {
374 case NEED_MORE:
375 this->eap_payload = eap;
376 return NEED_MORE;
377 case SUCCESS:
378 /* EAP exchange completed, now create and process AUTH */
379 this->eap_payload = NULL;
380 this->public.task.build = (status_t(*)(task_t*,message_t*))build_auth_eap;
381 this->public.task.process = (status_t(*)(task_t*,message_t*))process_auth_eap;
382 return NEED_MORE;
383 default:
384 this->eap_payload = NULL;
385 SIG(IKE_UP_FAILED, "failed to authenticate against %D using EAP",
386 this->ike_sa->get_other_id(this->ike_sa));
387 return FAILED;
388 }
389 }
390
391 /**
392 * Implementation of task_t.process for EAP exchanges
393 */
394 static status_t process_eap_r(private_ike_auth_t *this, message_t *message)
395 {
396 this->eap_payload = (eap_payload_t*)message->get_payload(message,
397 EXTENSIBLE_AUTHENTICATION);
398 return NEED_MORE;
399 }
400
401 /**
402 * Implementation of task_t.build for EAP exchanges
403 */
404 static status_t build_eap_i(private_ike_auth_t *this, message_t *message)
405 {
406 message->add_payload(message, (payload_t*)this->eap_payload);
407 return NEED_MORE;
408 }
409
410 /**
411 * Implementation of task_t.build for EAP exchanges
412 */
413 static status_t build_eap_r(private_ike_auth_t *this, message_t *message)
414 {
415 status_t status = NEED_MORE;
416 eap_payload_t *eap;
417
418 if (this->eap_payload == NULL)
419 {
420 SIG(IKE_UP_FAILED, "EAP payload missing");
421 return FAILED;
422 }
423
424 switch (this->eap_auth->process(this->eap_auth, this->eap_payload, &eap))
425 {
426 case NEED_MORE:
427
428 break;
429 case SUCCESS:
430 /* EAP exchange completed, now create and process AUTH */
431 this->public.task.build = (status_t(*)(task_t*,message_t*))build_auth_eap;
432 this->public.task.process = (status_t(*)(task_t*,message_t*))process_auth_eap;
433 break;
434 default:
435 SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
436 this->ike_sa->get_other_id(this->ike_sa),
437 auth_method_names, AUTH_EAP);
438 status = FAILED;
439 break;
440 }
441 message->add_payload(message, (payload_t*)eap);
442 return status;
443 }
444
445 /**
446 * Implementation of task_t.build for initiator
447 */
448 static status_t build_i(private_ike_auth_t *this, message_t *message)
449 {
450 policy_t *policy;
451
452 if (message->get_exchange_type(message) == IKE_SA_INIT)
453 {
454 return collect_my_init_data(this, message);
455 }
456
457 if (build_id(this, message) != SUCCESS)
458 {
459 return FAILED;
460 }
461
462 policy = this->ike_sa->get_policy(this->ike_sa);
463 if (policy->get_auth_method(policy) == AUTH_EAP)
464 {
465 this->eap_auth = eap_authenticator_create(this->ike_sa);
466 }
467 else
468 {
469 if (build_auth(this, message) != SUCCESS)
470 {
471 return FAILED;
472 }
473 }
474
475 return NEED_MORE;
476 }
477
478 /**
479 * Implementation of task_t.process for initiator
480 */
481 static status_t process_r(private_ike_auth_t *this, message_t *message)
482 {
483 if (message->get_exchange_type(message) == IKE_SA_INIT)
484 {
485 return collect_other_init_data(this, message);
486 }
487
488 if (process_id(this, message) != SUCCESS)
489 {
490 return NEED_MORE;
491 }
492
493 switch (process_auth(this, message))
494 {
495 case SUCCESS:
496 this->peer_authenticated = TRUE;
497 break;
498 case NOT_FOUND:
499 /* use EAP if no AUTH payload found */
500 this->eap_auth = eap_authenticator_create(this->ike_sa);
501 break;
502 default:
503 break;
504 }
505 return NEED_MORE;
506 }
507
508 /**
509 * Implementation of task_t.build for responder
510 */
511 static status_t build_r(private_ike_auth_t *this, message_t *message)
512 {
513 policy_t *policy;
514 eap_type_t eap_type;
515 eap_payload_t *eap_payload;
516 status_t status;
517
518 if (message->get_exchange_type(message) == IKE_SA_INIT)
519 {
520 return collect_my_init_data(this, message);
521 }
522
523 policy = this->ike_sa->get_policy(this->ike_sa);
524 if (policy == NULL)
525 {
526 SIG(IKE_UP_SUCCESS, "no acceptable policy found");
527 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
528 return FAILED;
529 }
530
531 if (build_id(this, message) != SUCCESS ||
532 build_auth(this, message) != SUCCESS)
533 {
534 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
535 return FAILED;
536 }
537
538 /* use "traditional" authentication if we could authenticate peer */
539 if (this->peer_authenticated)
540 {
541
542 this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
543 SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
544 this->ike_sa->get_my_id(this->ike_sa),
545 this->ike_sa->get_my_host(this->ike_sa),
546 this->ike_sa->get_other_host(this->ike_sa),
547 this->ike_sa->get_other_id(this->ike_sa));
548 return SUCCESS;
549 }
550
551 if (this->eap_auth == NULL)
552 {
553 /* peer not authenticated, nor does it want to use EAP */
554 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
555 return FAILED;
556 }
557
558 /* initiate EAP authenitcation */
559 eap_type = policy->get_eap_type(policy);
560 status = this->eap_auth->initiate(this->eap_auth, eap_type, &eap_payload);
561 message->add_payload(message, (payload_t*)eap_payload);
562 if (status != NEED_MORE)
563 {
564 SIG(IKE_UP_FAILED, "unable to initiate EAP authentication");
565 return FAILED;
566 }
567
568 /* switch to EAP methods */
569 this->public.task.build = (status_t(*)(task_t*,message_t*))build_eap_r;
570 this->public.task.process = (status_t(*)(task_t*,message_t*))process_eap_r;
571 return NEED_MORE;
572 }
573
574 /**
575 * Implementation of task_t.process for initiator
576 */
577 static status_t process_i(private_ike_auth_t *this, message_t *message)
578 {
579 iterator_t *iterator;
580 payload_t *payload;
581
582 if (message->get_exchange_type(message) == IKE_SA_INIT)
583 {
584 return collect_other_init_data(this, message);
585 }
586
587 iterator = message->get_payload_iterator(message);
588 while (iterator->iterate(iterator, (void**)&payload))
589 {
590 if (payload->get_type(payload) == NOTIFY)
591 {
592 notify_payload_t *notify = (notify_payload_t*)payload;
593 notify_type_t type = notify->get_notify_type(notify);
594
595 switch (type)
596 {
597 case NO_PROPOSAL_CHOSEN:
598 case SINGLE_PAIR_REQUIRED:
599 case NO_ADDITIONAL_SAS:
600 case INTERNAL_ADDRESS_FAILURE:
601 case FAILED_CP_REQUIRED:
602 case TS_UNACCEPTABLE:
603 case INVALID_SELECTORS:
604 /* these are errors, but are not critical as only the
605 * CHILD_SA won't get build, but IKE_SA establishes anyway */
606 break;
607 default:
608 {
609 if (type < 16383)
610 {
611 SIG(IKE_UP_FAILED, "received %N notify error",
612 notify_type_names, type);
613 iterator->destroy(iterator);
614 return FAILED;
615 }
616 DBG1(DBG_IKE, "received %N notify",
617 notify_type_names, type);
618 break;
619 }
620 }
621 }
622 }
623 iterator->destroy(iterator);
624
625 if (process_id(this, message) != SUCCESS ||
626 process_auth(this, message) != SUCCESS)
627 {
628 return FAILED;
629 }
630
631 if (this->eap_auth)
632 {
633 /* switch to EAP authentication methods */
634 this->public.task.build = (status_t(*)(task_t*,message_t*))build_eap_i;
635 this->public.task.process = (status_t(*)(task_t*,message_t*))process_eap_i;
636 return process_eap_i(this, message);
637 }
638
639 this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
640 SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
641 this->ike_sa->get_my_id(this->ike_sa),
642 this->ike_sa->get_my_host(this->ike_sa),
643 this->ike_sa->get_other_host(this->ike_sa),
644 this->ike_sa->get_other_id(this->ike_sa));
645 return SUCCESS;
646 }
647
648 /**
649 * Implementation of task_t.get_type
650 */
651 static task_type_t get_type(private_ike_auth_t *this)
652 {
653 return IKE_AUTHENTICATE;
654 }
655
656 /**
657 * Implementation of task_t.migrate
658 */
659 static void migrate(private_ike_auth_t *this, ike_sa_t *ike_sa)
660 {
661 chunk_free(&this->my_nonce);
662 chunk_free(&this->other_nonce);
663 DESTROY_IF(this->my_packet);
664 DESTROY_IF(this->other_packet);
665 if (this->eap_auth)
666 {
667 this->eap_auth->authenticator_interface.destroy(
668 &this->eap_auth->authenticator_interface);
669 }
670
671 this->my_packet = NULL;
672 this->other_packet = NULL;
673 this->peer_authenticated = FALSE;
674 this->eap_auth = NULL;
675 this->eap_payload = NULL;
676 this->ike_sa = ike_sa;
677 if (this->initiator)
678 {
679 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
680 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
681 }
682 else
683 {
684 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
685 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
686 }
687 }
688
689 /**
690 * Implementation of task_t.destroy
691 */
692 static void destroy(private_ike_auth_t *this)
693 {
694 chunk_free(&this->my_nonce);
695 chunk_free(&this->other_nonce);
696 DESTROY_IF(this->my_packet);
697 DESTROY_IF(this->other_packet);
698 if (this->eap_auth)
699 {
700 this->eap_auth->authenticator_interface.destroy(
701 &this->eap_auth->authenticator_interface);
702 }
703 free(this);
704 }
705
706 /*
707 * Described in header.
708 */
709 ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator)
710 {
711 private_ike_auth_t *this = malloc_thing(private_ike_auth_t);
712
713 this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
714 this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
715 this->public.task.destroy = (void(*)(task_t*))destroy;
716
717 if (initiator)
718 {
719 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
720 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
721 }
722 else
723 {
724 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
725 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
726 }
727
728 this->ike_sa = ike_sa;
729 this->initiator = initiator;
730 this->my_nonce = chunk_empty;
731 this->other_nonce = chunk_empty;
732 this->my_packet = NULL;
733 this->other_packet = NULL;
734 this->peer_authenticated = FALSE;
735 this->eap_auth = NULL;
736 this->eap_payload = NULL;
737
738 return &this->public;
739 }