357f8a32a10815347df4b2655bd93e5fc2abea93
[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(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
368 if (this->initiator)
369 {
370 switch (this->eap_auth->process(this->eap_auth, eap, &eap))
371 {
372 case NEED_MORE:
373 break;
374 case SUCCESS:
375 /* EAP exchange completed, now create and process AUTH */
376 this->public.task.build = (status_t(*)(task_t*,message_t*))build_auth_eap;
377 this->public.task.process = (status_t(*)(task_t*,message_t*))process_auth_eap;
378 return NEED_MORE;
379 default:
380 SIG(IKE_UP_FAILED, "failed to authenticate against %D using EAP",
381 this->ike_sa->get_other_id(this->ike_sa));
382 return FAILED;
383 }
384 }
385 this->eap_payload = eap;
386 return NEED_MORE;
387 }
388
389 /**
390 * Implementation of task_t.build for EAP exchanges
391 */
392 static status_t build_eap(private_ike_auth_t *this, message_t *message)
393 {
394 eap_payload_t *eap;
395
396 if (this->eap_payload == NULL)
397 {
398 SIG(IKE_UP_FAILED, "expected an EAP payload, but none found");
399 return FAILED;
400 }
401
402 if (this->initiator)
403 {
404 chunk_t chunk = this->eap_payload->get_data(this->eap_payload);
405 eap = eap_payload_create_data(chunk);
406 message->add_payload(message, (payload_t*)eap);
407 return NEED_MORE;
408 }
409 switch (this->eap_auth->process(this->eap_auth, eap, &eap))
410 {
411 case NEED_MORE:
412 return NEED_MORE;
413 case SUCCESS:
414 message->add_payload(message, (payload_t*)eap);
415 /* EAP exchange completed, now create and process AUTH */
416 this->public.task.build = (status_t(*)(task_t*,message_t*))build_auth_eap;
417 this->public.task.process = (status_t(*)(task_t*,message_t*))process_auth_eap;
418 return NEED_MORE;
419 default:
420 SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
421 this->ike_sa->get_other_id(this->ike_sa),
422 auth_method_names, AUTH_EAP);
423 message->add_payload(message, (payload_t*)eap);
424 return FAILED;
425 }
426 }
427
428 /**
429 * Implementation of task_t.build for initiator
430 */
431 static status_t build_i(private_ike_auth_t *this, message_t *message)
432 {
433 policy_t *policy;
434
435 if (message->get_exchange_type(message) == IKE_SA_INIT)
436 {
437 return collect_my_init_data(this, message);
438 }
439
440 if (build_id(this, message) != SUCCESS)
441 {
442 return FAILED;
443 }
444
445 policy = this->ike_sa->get_policy(this->ike_sa);
446 if (policy->get_auth_method(policy) == AUTH_EAP)
447 {
448 this->eap_auth = eap_authenticator_create(this->ike_sa);
449 }
450 else
451 {
452 if (build_auth(this, message) != SUCCESS)
453 {
454 return FAILED;
455 }
456 }
457
458 return NEED_MORE;
459 }
460
461 /**
462 * Implementation of task_t.process for initiator
463 */
464 static status_t process_r(private_ike_auth_t *this, message_t *message)
465 {
466 if (message->get_exchange_type(message) == IKE_SA_INIT)
467 {
468 return collect_other_init_data(this, message);
469 }
470
471 if (process_id(this, message) != SUCCESS)
472 {
473 return NEED_MORE;
474 }
475
476 switch (process_auth(this, message))
477 {
478 case SUCCESS:
479 this->peer_authenticated = TRUE;
480 break;
481 case NOT_FOUND:
482 /* use EAP if no AUTH payload found */
483 this->eap_auth = eap_authenticator_create(this->ike_sa);
484 break;
485 default:
486 break;
487 }
488 return NEED_MORE;
489 }
490
491 /**
492 * Implementation of task_t.build for responder
493 */
494 static status_t build_r(private_ike_auth_t *this, message_t *message)
495 {
496 policy_t *policy;
497 eap_type_t eap_type;
498 eap_payload_t *eap_payload;
499 status_t status;
500
501 if (message->get_exchange_type(message) == IKE_SA_INIT)
502 {
503 return collect_my_init_data(this, message);
504 }
505
506 policy = this->ike_sa->get_policy(this->ike_sa);
507 if (policy == NULL)
508 {
509 SIG(IKE_UP_SUCCESS, "no acceptable policy found");
510 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
511 return FAILED;
512 }
513
514 if (build_id(this, message) != SUCCESS ||
515 build_auth(this, message) != SUCCESS)
516 {
517 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
518 return FAILED;
519 }
520
521 /* use "traditional" authentication if we could authenticate peer */
522 if (this->peer_authenticated)
523 {
524
525 this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
526 SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
527 this->ike_sa->get_my_id(this->ike_sa),
528 this->ike_sa->get_my_host(this->ike_sa),
529 this->ike_sa->get_other_host(this->ike_sa),
530 this->ike_sa->get_other_id(this->ike_sa));
531 return SUCCESS;
532 }
533
534 if (this->eap_auth == NULL)
535 {
536 /* peer not authenticated, nor does it want to use EAP */
537 message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
538 return FAILED;
539 }
540
541 /* initiate EAP authenitcation */
542 eap_type = policy->get_eap_type(policy);
543 status = this->eap_auth->initiate(this->eap_auth, eap_type, &eap_payload);
544 message->add_payload(message, (payload_t*)eap_payload);
545 if (status != NEED_MORE)
546 {
547 SIG(IKE_UP_FAILED, "unable to initiate EAP authentication");
548 return FAILED;
549 }
550
551 /* switch to EAP methods */
552 this->public.task.build = (status_t(*)(task_t*,message_t*))build_eap;
553 this->public.task.process = (status_t(*)(task_t*,message_t*))process_eap;
554 return NEED_MORE;
555 }
556
557 /**
558 * Implementation of task_t.process for initiator
559 */
560 static status_t process_i(private_ike_auth_t *this, message_t *message)
561 {
562 iterator_t *iterator;
563 payload_t *payload;
564
565 if (message->get_exchange_type(message) == IKE_SA_INIT)
566 {
567 return collect_other_init_data(this, message);
568 }
569
570 iterator = message->get_payload_iterator(message);
571 while (iterator->iterate(iterator, (void**)&payload))
572 {
573 if (payload->get_type(payload) == NOTIFY)
574 {
575 notify_payload_t *notify = (notify_payload_t*)payload;
576 notify_type_t type = notify->get_notify_type(notify);
577
578 switch (type)
579 {
580 case NO_PROPOSAL_CHOSEN:
581 case SINGLE_PAIR_REQUIRED:
582 case NO_ADDITIONAL_SAS:
583 case INTERNAL_ADDRESS_FAILURE:
584 case FAILED_CP_REQUIRED:
585 case TS_UNACCEPTABLE:
586 case INVALID_SELECTORS:
587 /* these are errors, but are not critical as only the
588 * CHILD_SA won't get build, but IKE_SA establishes anyway */
589 break;
590 default:
591 {
592 if (type < 16383)
593 {
594 DBG1(DBG_IKE, "received %N notify error",
595 notify_type_names, type);
596 iterator->destroy(iterator);
597 return FAILED;
598 }
599 }
600 }
601 }
602 }
603 iterator->destroy(iterator);
604
605 if (process_id(this, message) != SUCCESS ||
606 process_auth(this, message) != SUCCESS)
607 {
608 return FAILED;
609 }
610
611 if (this->eap_auth)
612 {
613 /* switch to EAP authentication methods */
614 this->public.task.build = (status_t(*)(task_t*,message_t*))build_eap;
615 this->public.task.process = (status_t(*)(task_t*,message_t*))process_eap;
616 return process_eap(this, message);
617 }
618
619 this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
620 SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
621 this->ike_sa->get_my_id(this->ike_sa),
622 this->ike_sa->get_my_host(this->ike_sa),
623 this->ike_sa->get_other_host(this->ike_sa),
624 this->ike_sa->get_other_id(this->ike_sa));
625 return SUCCESS;
626 }
627
628 /**
629 * Implementation of task_t.get_type
630 */
631 static task_type_t get_type(private_ike_auth_t *this)
632 {
633 return IKE_AUTHENTICATE;
634 }
635
636 /**
637 * Implementation of task_t.migrate
638 */
639 static void migrate(private_ike_auth_t *this, ike_sa_t *ike_sa)
640 {
641 chunk_free(&this->my_nonce);
642 chunk_free(&this->other_nonce);
643 DESTROY_IF(this->my_packet);
644 DESTROY_IF(this->other_packet);
645 if (this->eap_auth)
646 {
647 this->eap_auth->authenticator_interface.destroy(
648 &this->eap_auth->authenticator_interface);
649 }
650
651 this->my_packet = NULL;
652 this->other_packet = NULL;
653 this->peer_authenticated = FALSE;
654 this->eap_auth = NULL;
655 this->eap_payload = NULL;
656 this->ike_sa = ike_sa;
657 if (this->initiator)
658 {
659 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
660 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
661 }
662 else
663 {
664 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
665 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
666 }
667 }
668
669 /**
670 * Implementation of task_t.destroy
671 */
672 static void destroy(private_ike_auth_t *this)
673 {
674 chunk_free(&this->my_nonce);
675 chunk_free(&this->other_nonce);
676 DESTROY_IF(this->my_packet);
677 DESTROY_IF(this->other_packet);
678 if (this->eap_auth)
679 {
680 this->eap_auth->authenticator_interface.destroy(
681 &this->eap_auth->authenticator_interface);
682 }
683 free(this);
684 }
685
686 /*
687 * Described in header.
688 */
689 ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator)
690 {
691 private_ike_auth_t *this = malloc_thing(private_ike_auth_t);
692
693 this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
694 this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
695 this->public.task.destroy = (void(*)(task_t*))destroy;
696
697 if (initiator)
698 {
699 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
700 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
701 }
702 else
703 {
704 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
705 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
706 }
707
708 this->ike_sa = ike_sa;
709 this->initiator = initiator;
710 this->my_nonce = chunk_empty;
711 this->other_nonce = chunk_empty;
712 this->my_packet = NULL;
713 this->other_packet = NULL;
714 this->peer_authenticated = FALSE;
715 this->eap_auth = NULL;
716 this->eap_payload = NULL;
717
718 return &this->public;
719 }