Fixed compiler warnings.
[strongswan.git] / src / libstrongswan / credentials / credential_manager.c
1 /*
2 * Copyright (C) 2007 Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 #include "credential_manager.h"
17
18 #include <library.h>
19 #include <debug.h>
20 #include <threading/thread_value.h>
21 #include <threading/mutex.h>
22 #include <threading/rwlock.h>
23 #include <utils/linked_list.h>
24 #include <credentials/sets/cert_cache.h>
25 #include <credentials/sets/auth_cfg_wrapper.h>
26 #include <credentials/certificates/x509.h>
27
28 /**
29 * Maximum length of a certificate trust chain
30 */
31 #define MAX_TRUST_PATH_LEN 7
32
33 typedef struct private_credential_manager_t private_credential_manager_t;
34
35 /**
36 * private data of credential_manager
37 */
38 struct private_credential_manager_t {
39
40 /**
41 * public functions
42 */
43 credential_manager_t public;
44
45 /**
46 * list of credential sets
47 */
48 linked_list_t *sets;
49
50 /**
51 * thread local set of credentials, linked_list_t with credential_set_t's
52 */
53 thread_value_t *local_sets;
54
55 /**
56 * trust relationship and certificate cache
57 */
58 cert_cache_t *cache;
59
60 /**
61 * certificates queued for persistent caching
62 */
63 linked_list_t *cache_queue;
64
65 /**
66 * list of certificate validators, cert_validator_t
67 */
68 linked_list_t *validators;
69
70 /**
71 * read-write lock to sets list
72 */
73 rwlock_t *lock;
74
75 /**
76 * mutex for cache queue
77 */
78 mutex_t *queue_mutex;
79 };
80
81 /** data to pass to create_private_enumerator */
82 typedef struct {
83 private_credential_manager_t *this;
84 key_type_t type;
85 identification_t* keyid;
86 } private_data_t;
87
88 /** data to pass to create_cert_enumerator */
89 typedef struct {
90 private_credential_manager_t *this;
91 certificate_type_t cert;
92 key_type_t key;
93 identification_t *id;
94 bool trusted;
95 } cert_data_t;
96
97 /** data to pass to create_cdp_enumerator */
98 typedef struct {
99 private_credential_manager_t *this;
100 certificate_type_t type;
101 identification_t *id;
102 } cdp_data_t;
103
104 /** data to pass to create_shared_enumerator */
105 typedef struct {
106 private_credential_manager_t *this;
107 shared_key_type_t type;
108 identification_t *me;
109 identification_t *other;
110 } shared_data_t;
111
112 /** enumerator over local and global sets */
113 typedef struct {
114 /** implements enumerator_t */
115 enumerator_t public;
116 /** enumerator over global sets */
117 enumerator_t *global;
118 /** enumerator over local sets */
119 enumerator_t *local;
120 } sets_enumerator_t;
121
122
123 METHOD(enumerator_t, sets_enumerate, bool,
124 sets_enumerator_t *this, credential_set_t **set)
125 {
126 if (this->global)
127 {
128 if (this->global->enumerate(this->global, set))
129 {
130 return TRUE;
131 }
132 /* end of global sets, look for local */
133 this->global->destroy(this->global);
134 this->global = NULL;
135 }
136 if (this->local)
137 {
138 return this->local->enumerate(this->local, set);
139 }
140 return FALSE;
141 }
142
143 METHOD(enumerator_t, sets_destroy, void,
144 sets_enumerator_t *this)
145 {
146 DESTROY_IF(this->global);
147 DESTROY_IF(this->local);
148 free(this);
149 }
150
151 /**
152 * create an enumerator over both, global and local sets
153 */
154 static enumerator_t *create_sets_enumerator(private_credential_manager_t *this)
155 {
156 sets_enumerator_t *enumerator;
157 linked_list_t *local;
158
159 INIT(enumerator,
160 .public = {
161 .enumerate = (void*)_sets_enumerate,
162 .destroy = _sets_destroy,
163 },
164 .global = this->sets->create_enumerator(this->sets),
165 );
166 local = this->local_sets->get(this->local_sets);
167 if (local)
168 {
169 enumerator->local = local->create_enumerator(local);
170 }
171 return &enumerator->public;
172 }
173
174 /**
175 * cleanup function for cert data
176 */
177 static void destroy_cert_data(cert_data_t *data)
178 {
179 data->this->lock->unlock(data->this->lock);
180 free(data);
181 }
182
183 /**
184 * enumerator constructor for certificates
185 */
186 static enumerator_t *create_cert(credential_set_t *set, cert_data_t *data)
187 {
188 return set->create_cert_enumerator(set, data->cert, data->key,
189 data->id, data->trusted);
190 }
191
192 METHOD(credential_manager_t, create_cert_enumerator, enumerator_t*,
193 private_credential_manager_t *this, certificate_type_t certificate,
194 key_type_t key, identification_t *id, bool trusted)
195 {
196 cert_data_t *data = malloc_thing(cert_data_t);
197 data->this = this;
198 data->cert = certificate;
199 data->key = key;
200 data->id = id;
201 data->trusted = trusted;
202
203 this->lock->read_lock(this->lock);
204 return enumerator_create_nested(create_sets_enumerator(this),
205 (void*)create_cert, data,
206 (void*)destroy_cert_data);
207 }
208
209 METHOD(credential_manager_t, get_cert, certificate_t*,
210 private_credential_manager_t *this, certificate_type_t cert, key_type_t key,
211 identification_t *id, bool trusted)
212 {
213 certificate_t *current, *found = NULL;
214 enumerator_t *enumerator;
215
216 enumerator = create_cert_enumerator(this, cert, key, id, trusted);
217 if (enumerator->enumerate(enumerator, &current))
218 {
219 /* TODO: best match? order by keyid, subject, sualtname */
220 found = current->get_ref(current);
221 }
222 enumerator->destroy(enumerator);
223 return found;
224 }
225
226
227 /**
228 * cleanup function for cdp data
229 */
230 static void destroy_cdp_data(cdp_data_t *data)
231 {
232 data->this->lock->unlock(data->this->lock);
233 free(data);
234 }
235
236 /**
237 * enumerator constructor for CDPs
238 */
239 static enumerator_t *create_cdp(credential_set_t *set, cdp_data_t *data)
240 {
241 return set->create_cdp_enumerator(set, data->type, data->id);
242 }
243
244 METHOD(credential_manager_t, create_cdp_enumerator, enumerator_t*,
245 private_credential_manager_t *this, certificate_type_t type,
246 identification_t *id)
247 {
248 cdp_data_t *data;
249
250 INIT(data,
251 .this = this,
252 .type = type,
253 .id = id,
254 );
255 this->lock->read_lock(this->lock);
256 return enumerator_create_nested(create_sets_enumerator(this),
257 (void*)create_cdp, data,
258 (void*)destroy_cdp_data);
259 }
260
261 /**
262 * cleanup function for private data
263 */
264 static void destroy_private_data(private_data_t *data)
265 {
266 data->this->lock->unlock(data->this->lock);
267 free(data);
268 }
269
270 /**
271 * enumerator constructor for private keys
272 */
273 static enumerator_t *create_private(credential_set_t *set, private_data_t *data)
274 {
275 return set->create_private_enumerator(set, data->type, data->keyid);
276 }
277
278 /**
279 * Create an enumerator over private keys
280 */
281 static enumerator_t *create_private_enumerator(
282 private_credential_manager_t *this, key_type_t key, identification_t *keyid)
283 {
284 private_data_t *data;
285
286 INIT(data,
287 .this = this,
288 .type = key,
289 .keyid = keyid,
290 );
291 this->lock->read_lock(this->lock);
292 return enumerator_create_nested(create_sets_enumerator(this),
293 (void*)create_private, data,
294 (void*)destroy_private_data);
295 }
296
297 /**
298 * Look up a private key by its key identifier
299 */
300 static private_key_t* get_private_by_keyid(private_credential_manager_t *this,
301 key_type_t key, identification_t *keyid)
302 {
303 private_key_t *found = NULL;
304 enumerator_t *enumerator;
305
306 enumerator = create_private_enumerator(this, key, keyid);
307 if (enumerator->enumerate(enumerator, &found))
308 {
309 found->get_ref(found);
310 }
311 enumerator->destroy(enumerator);
312 return found;
313 }
314
315 /**
316 * cleanup function for shared data
317 */
318 static void destroy_shared_data(shared_data_t *data)
319 {
320 data->this->lock->unlock(data->this->lock);
321 free(data);
322 }
323
324 /**
325 * enumerator constructor for shared keys
326 */
327 static enumerator_t *create_shared(credential_set_t *set, shared_data_t *data)
328 {
329 return set->create_shared_enumerator(set, data->type, data->me, data->other);
330 }
331
332 METHOD(credential_manager_t, create_shared_enumerator, enumerator_t*,
333 private_credential_manager_t *this, shared_key_type_t type,
334 identification_t *me, identification_t *other)
335 {
336 shared_data_t *data;
337
338 INIT(data,
339 .this = this,
340 .type = type,
341 .me = me,
342 .other = other,
343 );
344 this->lock->read_lock(this->lock);
345 return enumerator_create_nested(create_sets_enumerator(this),
346 (void*)create_shared, data,
347 (void*)destroy_shared_data);
348 }
349
350 METHOD(credential_manager_t, get_shared, shared_key_t*,
351 private_credential_manager_t *this, shared_key_type_t type,
352 identification_t *me, identification_t *other)
353 {
354 shared_key_t *current, *found = NULL;
355 id_match_t *best_me = ID_MATCH_NONE, *best_other = ID_MATCH_NONE;
356 id_match_t *match_me, *match_other;
357 enumerator_t *enumerator;
358
359 enumerator = create_shared_enumerator(this, type, me, other);
360 while (enumerator->enumerate(enumerator, &current, &match_me, &match_other))
361 {
362 if (match_other > best_other ||
363 (match_other == best_other && match_me > best_me))
364 {
365 DESTROY_IF(found);
366 found = current->get_ref(current);
367 best_me = match_me;
368 best_other = match_other;
369 }
370 }
371 enumerator->destroy(enumerator);
372 return found;
373 }
374
375 METHOD(credential_manager_t, add_local_set, void,
376 private_credential_manager_t *this, credential_set_t *set)
377 {
378 linked_list_t *sets;
379
380 sets = this->local_sets->get(this->local_sets);
381 if (!sets)
382 { /* first invocation */
383 sets = linked_list_create();
384 this->local_sets->set(this->local_sets, sets);
385 }
386 sets->insert_last(sets, set);
387 }
388
389 METHOD(credential_manager_t, remove_local_set, void,
390 private_credential_manager_t *this, credential_set_t *set)
391 {
392 linked_list_t *sets;
393
394 sets = this->local_sets->get(this->local_sets);
395 sets->remove(sets, set, NULL);
396 }
397
398 METHOD(credential_manager_t, cache_cert, void,
399 private_credential_manager_t *this, certificate_t *cert)
400 {
401 credential_set_t *set;
402 enumerator_t *enumerator;
403
404 if (this->lock->try_write_lock(this->lock))
405 {
406 enumerator = this->sets->create_enumerator(this->sets);
407 while (enumerator->enumerate(enumerator, &set))
408 {
409 set->cache_cert(set, cert);
410 }
411 enumerator->destroy(enumerator);
412 this->lock->unlock(this->lock);
413 }
414 else
415 { /* we can't cache now as other threads are active, queue for later */
416 this->queue_mutex->lock(this->queue_mutex);
417 this->cache_queue->insert_last(this->cache_queue, cert->get_ref(cert));
418 this->queue_mutex->unlock(this->queue_mutex);
419 }
420 }
421
422 /**
423 * Try to cache certificates queued for caching
424 */
425 static void cache_queue(private_credential_manager_t *this)
426 {
427 credential_set_t *set;
428 certificate_t *cert;
429 enumerator_t *enumerator;
430
431 this->queue_mutex->lock(this->queue_mutex);
432 if (this->cache_queue->get_count(this->cache_queue) > 0 &&
433 this->lock->try_write_lock(this->lock))
434 {
435 while (this->cache_queue->remove_last(this->cache_queue,
436 (void**)&cert) == SUCCESS)
437 {
438 enumerator = this->sets->create_enumerator(this->sets);
439 while (enumerator->enumerate(enumerator, &set))
440 {
441 set->cache_cert(set, cert);
442 }
443 enumerator->destroy(enumerator);
444 cert->destroy(cert);
445 }
446 this->lock->unlock(this->lock);
447 }
448 this->queue_mutex->unlock(this->queue_mutex);
449 }
450
451 /**
452 * check a certificate for its lifetime
453 */
454 static bool check_certificate(private_credential_manager_t *this,
455 certificate_t *subject, certificate_t *issuer,
456 bool online, int pathlen, auth_cfg_t *auth)
457 {
458 time_t not_before, not_after;
459 cert_validator_t *validator;
460 enumerator_t *enumerator;
461
462 if (!subject->get_validity(subject, NULL, &not_before, &not_after))
463 {
464 DBG1(DBG_CFG, "subject certificate invalid (valid from %T to %T)",
465 &not_before, FALSE, &not_after, FALSE);
466 return FALSE;
467 }
468 if (!issuer->get_validity(issuer, NULL, &not_before, &not_after))
469 {
470 DBG1(DBG_CFG, "issuer certificate invalid (valid from %T to %T)",
471 &not_before, FALSE, &not_after, FALSE);
472 return FALSE;
473 }
474 if (issuer->get_type(issuer) == CERT_X509 &&
475 subject->get_type(subject) == CERT_X509)
476 {
477 int pathlen_constraint;
478 x509_t *x509;
479
480 /* check path length constraint */
481 x509 = (x509_t*)issuer;
482 pathlen_constraint = x509->get_pathLenConstraint(x509);
483 if (pathlen_constraint != X509_NO_PATH_LEN_CONSTRAINT &&
484 pathlen > pathlen_constraint)
485 {
486 DBG1(DBG_CFG, "path length of %d violates constraint of %d",
487 pathlen, pathlen_constraint);
488 return FALSE;
489 }
490 }
491
492 enumerator = this->validators->create_enumerator(this->validators);
493 while (enumerator->enumerate(enumerator, &validator))
494 {
495 if (!validator->validate(validator, subject, issuer,
496 online, pathlen, auth))
497 {
498 enumerator->destroy(enumerator);
499 return FALSE;
500 }
501 }
502 enumerator->destroy(enumerator);
503 return TRUE;
504 }
505
506 /**
507 * Get a trusted certificate from a credential set
508 */
509 static certificate_t *get_pretrusted_cert(private_credential_manager_t *this,
510 key_type_t type, identification_t *id)
511 {
512 certificate_t *subject;
513 public_key_t *public;
514
515 subject = get_cert(this, CERT_ANY, type, id, TRUE);
516 if (!subject)
517 {
518 return NULL;
519 }
520 public = subject->get_public_key(subject);
521 if (!public)
522 {
523 subject->destroy(subject);
524 return NULL;
525 }
526 public->destroy(public);
527 return subject;
528 }
529
530 /**
531 * Get the issuing certificate of a subject certificate
532 */
533 static certificate_t *get_issuer_cert(private_credential_manager_t *this,
534 certificate_t *subject, bool trusted)
535 {
536 enumerator_t *enumerator;
537 certificate_t *issuer = NULL, *candidate;
538
539 enumerator = create_cert_enumerator(this, subject->get_type(subject), KEY_ANY,
540 subject->get_issuer(subject), trusted);
541 while (enumerator->enumerate(enumerator, &candidate))
542 {
543 if (this->cache->issued_by(this->cache, subject, candidate))
544 {
545 issuer = candidate->get_ref(candidate);
546 break;
547 }
548 }
549 enumerator->destroy(enumerator);
550 return issuer;
551 }
552
553 /**
554 * try to verify the trust chain of subject, return TRUE if trusted
555 */
556 static bool verify_trust_chain(private_credential_manager_t *this,
557 certificate_t *subject, auth_cfg_t *result,
558 bool trusted, bool online)
559 {
560 certificate_t *current, *issuer;
561 auth_cfg_t *auth;
562 int pathlen;
563
564 auth = auth_cfg_create();
565 current = subject->get_ref(subject);
566
567 for (pathlen = 0; pathlen <= MAX_TRUST_PATH_LEN; pathlen++)
568 {
569 issuer = get_issuer_cert(this, current, TRUE);
570 if (issuer)
571 {
572 /* accept only self-signed CAs as trust anchor */
573 if (this->cache->issued_by(this->cache, issuer, issuer))
574 {
575 auth->add(auth, AUTH_RULE_CA_CERT, issuer->get_ref(issuer));
576 DBG1(DBG_CFG, " using trusted ca certificate \"%Y\"",
577 issuer->get_subject(issuer));
578 trusted = TRUE;
579 }
580 else
581 {
582 auth->add(auth, AUTH_RULE_IM_CERT, issuer->get_ref(issuer));
583 DBG1(DBG_CFG, " using trusted intermediate ca certificate "
584 "\"%Y\"", issuer->get_subject(issuer));
585 }
586 }
587 else
588 {
589 issuer = get_issuer_cert(this, current, FALSE);
590 if (issuer)
591 {
592 if (current->equals(current, issuer))
593 {
594 DBG1(DBG_CFG, " self-signed certificate \"%Y\" is not trusted",
595 current->get_subject(current));
596 issuer->destroy(issuer);
597 break;
598 }
599 auth->add(auth, AUTH_RULE_IM_CERT, issuer->get_ref(issuer));
600 DBG1(DBG_CFG, " using untrusted intermediate certificate "
601 "\"%Y\"", issuer->get_subject(issuer));
602 }
603 else
604 {
605 DBG1(DBG_CFG, "no issuer certificate found for \"%Y\"",
606 current->get_subject(current));
607 break;
608 }
609 }
610 if (!check_certificate(this, current, issuer, online, pathlen,
611 current == subject ? auth : NULL))
612 {
613 trusted = FALSE;
614 issuer->destroy(issuer);
615 break;
616 }
617 current->destroy(current);
618 current = issuer;
619 if (trusted)
620 {
621 DBG1(DBG_CFG, " reached self-signed root ca with a path length of %d",
622 pathlen);
623 break;
624 }
625 }
626 current->destroy(current);
627 if (pathlen > MAX_TRUST_PATH_LEN)
628 {
629 DBG1(DBG_CFG, "maximum path length of %d exceeded", MAX_TRUST_PATH_LEN);
630 }
631 if (trusted)
632 {
633 result->merge(result, auth, FALSE);
634 }
635 auth->destroy(auth);
636 return trusted;
637 }
638
639 /**
640 * enumerator for trusted certificates
641 */
642 typedef struct {
643 /** implements enumerator_t interface */
644 enumerator_t public;
645 /** enumerator over candidate peer certificates */
646 enumerator_t *candidates;
647 /** reference to the credential_manager */
648 private_credential_manager_t *this;
649 /** type of the requested key */
650 key_type_t type;
651 /** identity the requested key belongs to */
652 identification_t *id;
653 /** TRUE to do CRL/OCSP checking */
654 bool online;
655 /** pretrusted certificate we have served at first invocation */
656 certificate_t *pretrusted;
657 /** currently enumerating auth config */
658 auth_cfg_t *auth;
659 } trusted_enumerator_t;
660
661 METHOD(enumerator_t, trusted_enumerate, bool,
662 trusted_enumerator_t *this, certificate_t **cert, auth_cfg_t **auth)
663 {
664 certificate_t *current;
665
666 DESTROY_IF(this->auth);
667 this->auth = auth_cfg_create();
668
669 if (!this->candidates)
670 {
671 /* first invocation, build enumerator for next one */
672 this->candidates = create_cert_enumerator(this->this, CERT_ANY,
673 this->type, this->id, FALSE);
674 /* check if we have a trusted certificate for that peer */
675 this->pretrusted = get_pretrusted_cert(this->this, this->type, this->id);
676 if (this->pretrusted)
677 {
678 /* if we find a trusted self signed certificate, we just accept it.
679 * However, in order to fulfill authorization rules, we try to build
680 * the trust chain if it is not self signed */
681 if (this->this->cache->issued_by(this->this->cache,
682 this->pretrusted, this->pretrusted) ||
683 verify_trust_chain(this->this, this->pretrusted, this->auth,
684 TRUE, this->online))
685 {
686 this->auth->add(this->auth, AUTH_RULE_SUBJECT_CERT,
687 this->pretrusted->get_ref(this->pretrusted));
688 DBG1(DBG_CFG, " using trusted certificate \"%Y\"",
689 this->pretrusted->get_subject(this->pretrusted));
690 *cert = this->pretrusted;
691 if (auth)
692 {
693 *auth = this->auth;
694 }
695 return TRUE;
696 }
697 }
698 }
699 /* try to verify the trust chain for each certificate found */
700 while (this->candidates->enumerate(this->candidates, &current))
701 {
702 if (this->pretrusted &&
703 this->pretrusted->equals(this->pretrusted, current))
704 { /* skip pretrusted certificate we already served */
705 continue;
706 }
707
708 DBG1(DBG_CFG, " using certificate \"%Y\"",
709 current->get_subject(current));
710 if (verify_trust_chain(this->this, current, this->auth, FALSE,
711 this->online))
712 {
713 *cert = current;
714 if (auth)
715 {
716 *auth = this->auth;
717 }
718 return TRUE;
719 }
720 }
721 return FALSE;
722 }
723
724 METHOD(enumerator_t, trusted_destroy, void,
725 trusted_enumerator_t *this)
726 {
727 DESTROY_IF(this->pretrusted);
728 DESTROY_IF(this->auth);
729 DESTROY_IF(this->candidates);
730 free(this);
731 }
732
733 METHOD(credential_manager_t, create_trusted_enumerator, enumerator_t*,
734 private_credential_manager_t *this, key_type_t type,
735 identification_t *id, bool online)
736 {
737 trusted_enumerator_t *enumerator;
738
739 INIT(enumerator,
740 .public = {
741 .enumerate = (void*)_trusted_enumerate,
742 .destroy = _trusted_destroy,
743 },
744 .this = this,
745 .type = type,
746 .id = id,
747 .online = online,
748 );
749 return &enumerator->public;
750 }
751
752 /**
753 * enumerator for public keys
754 */
755 typedef struct {
756 /** implements enumerator_t interface */
757 enumerator_t public;
758 /** enumerator over candidate peer certificates */
759 enumerator_t *inner;
760 /** reference to the credential_manager */
761 private_credential_manager_t *this;
762 /** currently enumerating key */
763 public_key_t *current;
764 /** credset wrapper around auth config */
765 auth_cfg_wrapper_t *wrapper;
766 } public_enumerator_t;
767
768 METHOD(enumerator_t, public_enumerate, bool,
769 public_enumerator_t *this, public_key_t **key, auth_cfg_t **auth)
770 {
771 certificate_t *cert;
772
773 while (this->inner->enumerate(this->inner, &cert, auth))
774 {
775 DESTROY_IF(this->current);
776 this->current = cert->get_public_key(cert);
777 if (this->current)
778 {
779 *key = this->current;
780 return TRUE;
781 }
782 }
783 return FALSE;
784 }
785
786 METHOD(enumerator_t, public_destroy, void,
787 public_enumerator_t *this)
788 {
789 DESTROY_IF(this->current);
790 this->inner->destroy(this->inner);
791 if (this->wrapper)
792 {
793 remove_local_set(this->this, &this->wrapper->set);
794 this->wrapper->destroy(this->wrapper);
795 }
796 this->this->lock->unlock(this->this->lock);
797
798 /* check for delayed certificate cache queue */
799 cache_queue(this->this);
800 free(this);
801 }
802
803 METHOD(credential_manager_t, create_public_enumerator, enumerator_t*,
804 private_credential_manager_t *this, key_type_t type, identification_t *id,
805 auth_cfg_t *auth)
806 {
807 public_enumerator_t *enumerator;
808
809 INIT(enumerator,
810 .public = {
811 .enumerate = (void*)_public_enumerate,
812 .destroy = _public_destroy,
813 },
814 .inner = create_trusted_enumerator(this, type, id, TRUE),
815 .this = this,
816 );
817 if (auth)
818 {
819 enumerator->wrapper = auth_cfg_wrapper_create(auth);
820 add_local_set(this, &enumerator->wrapper->set);
821 }
822 this->lock->read_lock(this->lock);
823 return &enumerator->public;
824 }
825
826 /**
827 * Check if a certificate's keyid is contained in the auth helper
828 */
829 static bool auth_contains_cacert(auth_cfg_t *auth, certificate_t *cert)
830 {
831 enumerator_t *enumerator;
832 identification_t *value;
833 auth_rule_t type;
834 bool found = FALSE;
835
836 enumerator = auth->create_enumerator(auth);
837 while (enumerator->enumerate(enumerator, &type, &value))
838 {
839 if (type == AUTH_RULE_CA_CERT &&
840 cert->equals(cert, (certificate_t*)value))
841 {
842 found = TRUE;
843 break;
844 }
845 }
846 enumerator->destroy(enumerator);
847 return found;
848 }
849
850 /**
851 * build a trustchain from subject up to a trust anchor in trusted
852 */
853 static auth_cfg_t *build_trustchain(private_credential_manager_t *this,
854 certificate_t *subject, auth_cfg_t *auth)
855 {
856 certificate_t *issuer, *current;
857 auth_cfg_t *trustchain;
858 int pathlen = 0;
859
860 trustchain = auth_cfg_create();
861
862 current = auth->get(auth, AUTH_RULE_CA_CERT);
863 if (!current)
864 {
865 /* no trust anchor specified, return this cert only */
866 trustchain->add(trustchain, AUTH_RULE_SUBJECT_CERT,
867 subject->get_ref(subject));
868 return trustchain;
869 }
870 current = subject->get_ref(subject);
871 while (TRUE)
872 {
873 if (auth_contains_cacert(auth, current))
874 {
875 trustchain->add(trustchain, AUTH_RULE_CA_CERT, current);
876 return trustchain;
877 }
878 if (subject == current)
879 {
880 trustchain->add(trustchain, AUTH_RULE_SUBJECT_CERT, current);
881 }
882 else
883 {
884 trustchain->add(trustchain, AUTH_RULE_IM_CERT, current);
885 }
886 issuer = get_issuer_cert(this, current, FALSE);
887 if (!issuer || issuer->equals(issuer, current) ||
888 pathlen > MAX_TRUST_PATH_LEN)
889 {
890 DESTROY_IF(issuer);
891 break;
892 }
893 current = issuer;
894 pathlen++;
895 }
896 trustchain->destroy(trustchain);
897 return NULL;
898 }
899
900 /**
901 * find a private key of a give certificate
902 */
903 static private_key_t *get_private_by_cert(private_credential_manager_t *this,
904 certificate_t *cert, key_type_t type)
905 {
906 private_key_t *private = NULL;
907 identification_t *keyid;
908 chunk_t chunk;
909 public_key_t *public;
910
911 public = cert->get_public_key(cert);
912 if (public)
913 {
914 if (public->get_fingerprint(public, KEYID_PUBKEY_SHA1, &chunk))
915 {
916 keyid = identification_create_from_encoding(ID_KEY_ID, chunk);
917 private = get_private_by_keyid(this, type, keyid);
918 keyid->destroy(keyid);
919 }
920 public->destroy(public);
921 }
922 return private;
923 }
924
925 METHOD(credential_manager_t, get_private, private_key_t*,
926 private_credential_manager_t *this, key_type_t type, identification_t *id,
927 auth_cfg_t *auth)
928 {
929 enumerator_t *enumerator;
930 certificate_t *cert;
931 private_key_t *private = NULL;
932 auth_cfg_t *trustchain;
933
934 /* check if this is a lookup by key ID, and do it if so */
935 if (id && id->get_type(id) == ID_KEY_ID)
936 {
937 private = get_private_by_keyid(this, type, id);
938 if (private)
939 {
940 return private;
941 }
942 }
943
944 /* if a specific certificate is preferred, check for a matching key */
945 cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
946 if (cert)
947 {
948 private = get_private_by_cert(this, cert, type);
949 if (private)
950 {
951 trustchain = build_trustchain(this, cert, auth);
952 if (trustchain)
953 {
954 auth->merge(auth, trustchain, FALSE);
955 trustchain->destroy(trustchain);
956 }
957 return private;
958 }
959 }
960
961 /* try to build a trust chain for each certificate found */
962 enumerator = create_cert_enumerator(this, CERT_ANY, type, id, FALSE);
963 while (enumerator->enumerate(enumerator, &cert))
964 {
965 private = get_private_by_cert(this, cert, type);
966 if (private)
967 {
968 trustchain = build_trustchain(this, cert, auth);
969 if (trustchain)
970 {
971 auth->merge(auth, trustchain, FALSE);
972 trustchain->destroy(trustchain);
973 break;
974 }
975 private->destroy(private);
976 private = NULL;
977 }
978 }
979 enumerator->destroy(enumerator);
980
981 /* if no valid trustchain was found, fall back to the first usable cert */
982 if (!private)
983 {
984 enumerator = create_cert_enumerator(this, CERT_ANY, type, id, FALSE);
985 while (enumerator->enumerate(enumerator, &cert))
986 {
987 private = get_private_by_cert(this, cert, type);
988 if (private)
989 {
990 auth->add(auth, AUTH_RULE_SUBJECT_CERT, cert->get_ref(cert));
991 break;
992 }
993 }
994 enumerator->destroy(enumerator);
995 }
996 return private;
997 }
998
999 METHOD(credential_manager_t, flush_cache, void,
1000 private_credential_manager_t *this, certificate_type_t type)
1001 {
1002 this->cache->flush(this->cache, type);
1003 }
1004
1005 METHOD(credential_manager_t, issued_by, bool,
1006 private_credential_manager_t *this, certificate_t *subject,
1007 certificate_t *issuer)
1008 {
1009 return this->cache->issued_by(this->cache, subject, issuer);
1010 }
1011
1012 METHOD(credential_manager_t, add_set, void,
1013 private_credential_manager_t *this, credential_set_t *set)
1014 {
1015 this->lock->write_lock(this->lock);
1016 this->sets->insert_last(this->sets, set);
1017 this->lock->unlock(this->lock);
1018 }
1019
1020 METHOD(credential_manager_t, remove_set, void,
1021 private_credential_manager_t *this, credential_set_t *set)
1022 {
1023 this->lock->write_lock(this->lock);
1024 this->sets->remove(this->sets, set, NULL);
1025 this->lock->unlock(this->lock);
1026 }
1027
1028 METHOD(credential_manager_t, add_validator, void,
1029 private_credential_manager_t *this, cert_validator_t *vdtr)
1030 {
1031 this->lock->write_lock(this->lock);
1032 this->sets->insert_last(this->validators, vdtr);
1033 this->lock->unlock(this->lock);
1034 }
1035
1036 METHOD(credential_manager_t, remove_validator, void,
1037 private_credential_manager_t *this, cert_validator_t *vdtr)
1038 {
1039 this->lock->write_lock(this->lock);
1040 this->validators->remove(this->validators, vdtr, NULL);
1041 this->lock->unlock(this->lock);
1042 }
1043
1044 METHOD(credential_manager_t, destroy, void,
1045 private_credential_manager_t *this)
1046 {
1047 cache_queue(this);
1048 this->cache_queue->destroy(this->cache_queue);
1049 this->sets->remove(this->sets, this->cache, NULL);
1050 this->sets->destroy(this->sets);
1051 this->local_sets->destroy(this->local_sets);
1052 this->cache->destroy(this->cache);
1053 this->validators->destroy(this->validators);
1054 this->lock->destroy(this->lock);
1055 this->queue_mutex->destroy(this->queue_mutex);
1056 free(this);
1057 }
1058
1059 /*
1060 * see header file
1061 */
1062 credential_manager_t *credential_manager_create()
1063 {
1064 private_credential_manager_t *this;
1065
1066 INIT(this,
1067 .public = {
1068 .create_cert_enumerator = _create_cert_enumerator,
1069 .create_shared_enumerator = _create_shared_enumerator,
1070 .create_cdp_enumerator = _create_cdp_enumerator,
1071 .get_cert = _get_cert,
1072 .get_shared = _get_shared,
1073 .get_private = _get_private,
1074 .create_trusted_enumerator = _create_trusted_enumerator,
1075 .create_public_enumerator = _create_public_enumerator,
1076 .flush_cache = _flush_cache,
1077 .cache_cert = _cache_cert,
1078 .issued_by = _issued_by,
1079 .add_set = _add_set,
1080 .remove_set = _remove_set,
1081 .add_local_set = _add_local_set,
1082 .remove_local_set = _remove_local_set,
1083 .add_validator = _add_validator,
1084 .remove_validator = _remove_validator,
1085 .destroy = _destroy,
1086 },
1087 .sets = linked_list_create(),
1088 .validators = linked_list_create(),
1089 .cache = cert_cache_create(),
1090 .cache_queue = linked_list_create(),
1091 .lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
1092 .queue_mutex = mutex_create(MUTEX_TYPE_DEFAULT),
1093 );
1094
1095 this->local_sets = thread_value_create((thread_cleanup_t)this->sets->destroy);
1096 this->sets->insert_first(this->sets, this->cache);
1097
1098 return &this->public;
1099 }