Always pass auth info to validate(), use pathlen to check for user certificate
[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
475 enumerator = this->validators->create_enumerator(this->validators);
476 while (enumerator->enumerate(enumerator, &validator))
477 {
478 if (!validator->validate(validator, subject, issuer,
479 online, pathlen, auth))
480 {
481 enumerator->destroy(enumerator);
482 return FALSE;
483 }
484 }
485 enumerator->destroy(enumerator);
486 return TRUE;
487 }
488
489 /**
490 * Get a trusted certificate from a credential set
491 */
492 static certificate_t *get_pretrusted_cert(private_credential_manager_t *this,
493 key_type_t type, identification_t *id)
494 {
495 certificate_t *subject;
496 public_key_t *public;
497
498 subject = get_cert(this, CERT_ANY, type, id, TRUE);
499 if (!subject)
500 {
501 return NULL;
502 }
503 public = subject->get_public_key(subject);
504 if (!public)
505 {
506 subject->destroy(subject);
507 return NULL;
508 }
509 public->destroy(public);
510 return subject;
511 }
512
513 /**
514 * Get the issuing certificate of a subject certificate
515 */
516 static certificate_t *get_issuer_cert(private_credential_manager_t *this,
517 certificate_t *subject, bool trusted)
518 {
519 enumerator_t *enumerator;
520 certificate_t *issuer = NULL, *candidate;
521
522 enumerator = create_cert_enumerator(this, subject->get_type(subject), KEY_ANY,
523 subject->get_issuer(subject), trusted);
524 while (enumerator->enumerate(enumerator, &candidate))
525 {
526 if (this->cache->issued_by(this->cache, subject, candidate))
527 {
528 issuer = candidate->get_ref(candidate);
529 break;
530 }
531 }
532 enumerator->destroy(enumerator);
533 return issuer;
534 }
535
536 /**
537 * Get the strength of certificate, add it to auth
538 */
539 static void get_key_strength(certificate_t *cert, auth_cfg_t *auth)
540 {
541 uintptr_t strength;
542 public_key_t *key;
543 key_type_t type;
544
545 key = cert->get_public_key(cert);
546 if (key)
547 {
548 type = key->get_type(key);
549 strength = key->get_keysize(key);
550 DBG2(DBG_CFG, " certificate \"%Y\" key: %d bit %N",
551 cert->get_subject(cert), strength, key_type_names, type);
552 switch (type)
553 {
554 case KEY_RSA:
555 auth->add(auth, AUTH_RULE_RSA_STRENGTH, strength);
556 break;
557 case KEY_ECDSA:
558 auth->add(auth, AUTH_RULE_ECDSA_STRENGTH, strength);
559 break;
560 default:
561 break;
562 }
563 key->destroy(key);
564 }
565 }
566
567 /**
568 * try to verify the trust chain of subject, return TRUE if trusted
569 */
570 static bool verify_trust_chain(private_credential_manager_t *this,
571 certificate_t *subject, auth_cfg_t *result,
572 bool trusted, bool online)
573 {
574 certificate_t *current, *issuer;
575 auth_cfg_t *auth;
576 int pathlen;
577
578 auth = auth_cfg_create();
579 get_key_strength(subject, auth);
580 current = subject->get_ref(subject);
581
582 for (pathlen = 0; pathlen <= MAX_TRUST_PATH_LEN; pathlen++)
583 {
584 issuer = get_issuer_cert(this, current, TRUE);
585 if (issuer)
586 {
587 /* accept only self-signed CAs as trust anchor */
588 if (this->cache->issued_by(this->cache, issuer, issuer))
589 {
590 auth->add(auth, AUTH_RULE_CA_CERT, issuer->get_ref(issuer));
591 DBG1(DBG_CFG, " using trusted ca certificate \"%Y\"",
592 issuer->get_subject(issuer));
593 trusted = TRUE;
594 }
595 else
596 {
597 auth->add(auth, AUTH_RULE_IM_CERT, issuer->get_ref(issuer));
598 DBG1(DBG_CFG, " using trusted intermediate ca certificate "
599 "\"%Y\"", issuer->get_subject(issuer));
600 }
601 }
602 else
603 {
604 issuer = get_issuer_cert(this, current, FALSE);
605 if (issuer)
606 {
607 if (current->equals(current, issuer))
608 {
609 DBG1(DBG_CFG, " self-signed certificate \"%Y\" is not trusted",
610 current->get_subject(current));
611 issuer->destroy(issuer);
612 break;
613 }
614 auth->add(auth, AUTH_RULE_IM_CERT, issuer->get_ref(issuer));
615 DBG1(DBG_CFG, " using untrusted intermediate certificate "
616 "\"%Y\"", issuer->get_subject(issuer));
617 }
618 else
619 {
620 DBG1(DBG_CFG, "no issuer certificate found for \"%Y\"",
621 current->get_subject(current));
622 break;
623 }
624 }
625 if (!check_certificate(this, current, issuer, online, pathlen, auth))
626 {
627 trusted = FALSE;
628 issuer->destroy(issuer);
629 break;
630 }
631 if (issuer)
632 {
633 get_key_strength(issuer, auth);
634 }
635 current->destroy(current);
636 current = issuer;
637 if (trusted)
638 {
639 DBG1(DBG_CFG, " reached self-signed root ca with a path length of %d",
640 pathlen);
641 break;
642 }
643 }
644 current->destroy(current);
645 if (pathlen > MAX_TRUST_PATH_LEN)
646 {
647 DBG1(DBG_CFG, "maximum path length of %d exceeded", MAX_TRUST_PATH_LEN);
648 }
649 if (trusted)
650 {
651 result->merge(result, auth, FALSE);
652 }
653 auth->destroy(auth);
654 return trusted;
655 }
656
657 /**
658 * enumerator for trusted certificates
659 */
660 typedef struct {
661 /** implements enumerator_t interface */
662 enumerator_t public;
663 /** enumerator over candidate peer certificates */
664 enumerator_t *candidates;
665 /** reference to the credential_manager */
666 private_credential_manager_t *this;
667 /** type of the requested key */
668 key_type_t type;
669 /** identity the requested key belongs to */
670 identification_t *id;
671 /** TRUE to do CRL/OCSP checking */
672 bool online;
673 /** pretrusted certificate we have served at first invocation */
674 certificate_t *pretrusted;
675 /** currently enumerating auth config */
676 auth_cfg_t *auth;
677 } trusted_enumerator_t;
678
679 METHOD(enumerator_t, trusted_enumerate, bool,
680 trusted_enumerator_t *this, certificate_t **cert, auth_cfg_t **auth)
681 {
682 certificate_t *current;
683
684 DESTROY_IF(this->auth);
685 this->auth = auth_cfg_create();
686
687 if (!this->candidates)
688 {
689 /* first invocation, build enumerator for next one */
690 this->candidates = create_cert_enumerator(this->this, CERT_ANY,
691 this->type, this->id, FALSE);
692 /* check if we have a trusted certificate for that peer */
693 this->pretrusted = get_pretrusted_cert(this->this, this->type, this->id);
694 if (this->pretrusted)
695 {
696 /* if we find a trusted self signed certificate, we just accept it.
697 * However, in order to fulfill authorization rules, we try to build
698 * the trust chain if it is not self signed */
699 if (this->this->cache->issued_by(this->this->cache,
700 this->pretrusted, this->pretrusted) ||
701 verify_trust_chain(this->this, this->pretrusted, this->auth,
702 TRUE, this->online))
703 {
704 this->auth->add(this->auth, AUTH_RULE_SUBJECT_CERT,
705 this->pretrusted->get_ref(this->pretrusted));
706 DBG1(DBG_CFG, " using trusted certificate \"%Y\"",
707 this->pretrusted->get_subject(this->pretrusted));
708 *cert = this->pretrusted;
709 if (auth)
710 {
711 *auth = this->auth;
712 }
713 return TRUE;
714 }
715 }
716 }
717 /* try to verify the trust chain for each certificate found */
718 while (this->candidates->enumerate(this->candidates, &current))
719 {
720 if (this->pretrusted &&
721 this->pretrusted->equals(this->pretrusted, current))
722 { /* skip pretrusted certificate we already served */
723 continue;
724 }
725
726 DBG1(DBG_CFG, " using certificate \"%Y\"",
727 current->get_subject(current));
728 if (verify_trust_chain(this->this, current, this->auth, FALSE,
729 this->online))
730 {
731 this->auth->add(this->auth, AUTH_RULE_SUBJECT_CERT,
732 current->get_ref(current));
733 *cert = current;
734 if (auth)
735 {
736 *auth = this->auth;
737 }
738 return TRUE;
739 }
740 }
741 return FALSE;
742 }
743
744 METHOD(enumerator_t, trusted_destroy, void,
745 trusted_enumerator_t *this)
746 {
747 DESTROY_IF(this->pretrusted);
748 DESTROY_IF(this->auth);
749 DESTROY_IF(this->candidates);
750 free(this);
751 }
752
753 METHOD(credential_manager_t, create_trusted_enumerator, enumerator_t*,
754 private_credential_manager_t *this, key_type_t type,
755 identification_t *id, bool online)
756 {
757 trusted_enumerator_t *enumerator;
758
759 INIT(enumerator,
760 .public = {
761 .enumerate = (void*)_trusted_enumerate,
762 .destroy = _trusted_destroy,
763 },
764 .this = this,
765 .type = type,
766 .id = id,
767 .online = online,
768 );
769 return &enumerator->public;
770 }
771
772 /**
773 * enumerator for public keys
774 */
775 typedef struct {
776 /** implements enumerator_t interface */
777 enumerator_t public;
778 /** enumerator over candidate peer certificates */
779 enumerator_t *inner;
780 /** reference to the credential_manager */
781 private_credential_manager_t *this;
782 /** currently enumerating key */
783 public_key_t *current;
784 /** credset wrapper around auth config */
785 auth_cfg_wrapper_t *wrapper;
786 } public_enumerator_t;
787
788 METHOD(enumerator_t, public_enumerate, bool,
789 public_enumerator_t *this, public_key_t **key, auth_cfg_t **auth)
790 {
791 certificate_t *cert;
792
793 while (this->inner->enumerate(this->inner, &cert, auth))
794 {
795 DESTROY_IF(this->current);
796 this->current = cert->get_public_key(cert);
797 if (this->current)
798 {
799 *key = this->current;
800 return TRUE;
801 }
802 }
803 return FALSE;
804 }
805
806 METHOD(enumerator_t, public_destroy, void,
807 public_enumerator_t *this)
808 {
809 DESTROY_IF(this->current);
810 this->inner->destroy(this->inner);
811 if (this->wrapper)
812 {
813 remove_local_set(this->this, &this->wrapper->set);
814 this->wrapper->destroy(this->wrapper);
815 }
816 this->this->lock->unlock(this->this->lock);
817
818 /* check for delayed certificate cache queue */
819 cache_queue(this->this);
820 free(this);
821 }
822
823 METHOD(credential_manager_t, create_public_enumerator, enumerator_t*,
824 private_credential_manager_t *this, key_type_t type, identification_t *id,
825 auth_cfg_t *auth)
826 {
827 public_enumerator_t *enumerator;
828
829 INIT(enumerator,
830 .public = {
831 .enumerate = (void*)_public_enumerate,
832 .destroy = _public_destroy,
833 },
834 .inner = create_trusted_enumerator(this, type, id, TRUE),
835 .this = this,
836 );
837 if (auth)
838 {
839 enumerator->wrapper = auth_cfg_wrapper_create(auth);
840 add_local_set(this, &enumerator->wrapper->set);
841 }
842 this->lock->read_lock(this->lock);
843 return &enumerator->public;
844 }
845
846 /**
847 * Check if an helper contains a certificate as trust anchor
848 */
849 static bool auth_contains_cacert(auth_cfg_t *auth, certificate_t *cert)
850 {
851 enumerator_t *enumerator;
852 identification_t *value;
853 auth_rule_t type;
854 bool found = FALSE;
855
856 enumerator = auth->create_enumerator(auth);
857 while (enumerator->enumerate(enumerator, &type, &value))
858 {
859 if (type == AUTH_RULE_CA_CERT &&
860 cert->equals(cert, (certificate_t*)value))
861 {
862 found = TRUE;
863 break;
864 }
865 }
866 enumerator->destroy(enumerator);
867 return found;
868 }
869
870 /**
871 * build a trustchain from subject up to a trust anchor in trusted
872 */
873 static auth_cfg_t *build_trustchain(private_credential_manager_t *this,
874 certificate_t *subject, auth_cfg_t *auth)
875 {
876 certificate_t *issuer, *current;
877 auth_cfg_t *trustchain;
878 int pathlen = 0;
879 bool has_anchor;
880
881 trustchain = auth_cfg_create();
882 has_anchor = auth->get(auth, AUTH_RULE_CA_CERT) != NULL;
883 current = subject->get_ref(subject);
884 while (TRUE)
885 {
886 if (auth_contains_cacert(auth, current))
887 {
888 trustchain->add(trustchain, AUTH_RULE_CA_CERT, current);
889 return trustchain;
890 }
891 if (subject == current)
892 {
893 trustchain->add(trustchain, AUTH_RULE_SUBJECT_CERT, current);
894 }
895 else
896 {
897 if (!has_anchor &&
898 this->cache->issued_by(this->cache, current, current))
899 { /* If no trust anchor specified, accept any CA */
900 trustchain->add(trustchain, AUTH_RULE_CA_CERT, current);
901 return trustchain;
902 }
903 trustchain->add(trustchain, AUTH_RULE_IM_CERT, current);
904 }
905 if (pathlen++ > MAX_TRUST_PATH_LEN)
906 {
907 break;
908 }
909 issuer = get_issuer_cert(this, current, FALSE);
910 if (!issuer)
911 {
912 if (!has_anchor)
913 { /* If no trust anchor specified, accept incomplete chains */
914 return trustchain;
915 }
916 break;
917 }
918 if (has_anchor && issuer->equals(issuer, current))
919 {
920 issuer->destroy(issuer);
921 break;
922 }
923 current = issuer;
924 }
925 trustchain->destroy(trustchain);
926 return NULL;
927 }
928
929 /**
930 * find a private key of a give certificate
931 */
932 static private_key_t *get_private_by_cert(private_credential_manager_t *this,
933 certificate_t *cert, key_type_t type)
934 {
935 private_key_t *private = NULL;
936 identification_t *keyid;
937 chunk_t chunk;
938 public_key_t *public;
939
940 public = cert->get_public_key(cert);
941 if (public)
942 {
943 if (public->get_fingerprint(public, KEYID_PUBKEY_SHA1, &chunk))
944 {
945 keyid = identification_create_from_encoding(ID_KEY_ID, chunk);
946 private = get_private_by_keyid(this, type, keyid);
947 keyid->destroy(keyid);
948 }
949 public->destroy(public);
950 }
951 return private;
952 }
953
954 METHOD(credential_manager_t, get_private, private_key_t*,
955 private_credential_manager_t *this, key_type_t type, identification_t *id,
956 auth_cfg_t *auth)
957 {
958 enumerator_t *enumerator;
959 certificate_t *cert;
960 private_key_t *private = NULL;
961 auth_cfg_t *trustchain;
962
963 /* check if this is a lookup by key ID, and do it if so */
964 if (id && id->get_type(id) == ID_KEY_ID)
965 {
966 private = get_private_by_keyid(this, type, id);
967 if (private)
968 {
969 return private;
970 }
971 }
972
973 /* if a specific certificate is preferred, check for a matching key */
974 cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
975 if (cert)
976 {
977 private = get_private_by_cert(this, cert, type);
978 if (private)
979 {
980 trustchain = build_trustchain(this, cert, auth);
981 if (trustchain)
982 {
983 auth->merge(auth, trustchain, FALSE);
984 trustchain->destroy(trustchain);
985 }
986 return private;
987 }
988 }
989
990 /* try to build a trust chain for each certificate found */
991 enumerator = create_cert_enumerator(this, CERT_ANY, type, id, FALSE);
992 while (enumerator->enumerate(enumerator, &cert))
993 {
994 private = get_private_by_cert(this, cert, type);
995 if (private)
996 {
997 trustchain = build_trustchain(this, cert, auth);
998 if (trustchain)
999 {
1000 auth->merge(auth, trustchain, FALSE);
1001 trustchain->destroy(trustchain);
1002 break;
1003 }
1004 private->destroy(private);
1005 private = NULL;
1006 }
1007 }
1008 enumerator->destroy(enumerator);
1009
1010 /* if no valid trustchain was found, fall back to the first usable cert */
1011 if (!private)
1012 {
1013 enumerator = create_cert_enumerator(this, CERT_ANY, type, id, FALSE);
1014 while (enumerator->enumerate(enumerator, &cert))
1015 {
1016 private = get_private_by_cert(this, cert, type);
1017 if (private)
1018 {
1019 auth->add(auth, AUTH_RULE_SUBJECT_CERT, cert->get_ref(cert));
1020 break;
1021 }
1022 }
1023 enumerator->destroy(enumerator);
1024 }
1025 return private;
1026 }
1027
1028 METHOD(credential_manager_t, flush_cache, void,
1029 private_credential_manager_t *this, certificate_type_t type)
1030 {
1031 this->cache->flush(this->cache, type);
1032 }
1033
1034 METHOD(credential_manager_t, issued_by, bool,
1035 private_credential_manager_t *this, certificate_t *subject,
1036 certificate_t *issuer)
1037 {
1038 return this->cache->issued_by(this->cache, subject, issuer);
1039 }
1040
1041 METHOD(credential_manager_t, add_set, void,
1042 private_credential_manager_t *this, credential_set_t *set)
1043 {
1044 this->lock->write_lock(this->lock);
1045 this->sets->insert_last(this->sets, set);
1046 this->lock->unlock(this->lock);
1047 }
1048
1049 METHOD(credential_manager_t, remove_set, void,
1050 private_credential_manager_t *this, credential_set_t *set)
1051 {
1052 this->lock->write_lock(this->lock);
1053 this->sets->remove(this->sets, set, NULL);
1054 this->lock->unlock(this->lock);
1055 }
1056
1057 METHOD(credential_manager_t, add_validator, void,
1058 private_credential_manager_t *this, cert_validator_t *vdtr)
1059 {
1060 this->lock->write_lock(this->lock);
1061 this->sets->insert_last(this->validators, vdtr);
1062 this->lock->unlock(this->lock);
1063 }
1064
1065 METHOD(credential_manager_t, remove_validator, void,
1066 private_credential_manager_t *this, cert_validator_t *vdtr)
1067 {
1068 this->lock->write_lock(this->lock);
1069 this->validators->remove(this->validators, vdtr, NULL);
1070 this->lock->unlock(this->lock);
1071 }
1072
1073 METHOD(credential_manager_t, destroy, void,
1074 private_credential_manager_t *this)
1075 {
1076 cache_queue(this);
1077 this->cache_queue->destroy(this->cache_queue);
1078 this->sets->remove(this->sets, this->cache, NULL);
1079 this->sets->destroy(this->sets);
1080 this->local_sets->destroy(this->local_sets);
1081 this->cache->destroy(this->cache);
1082 this->validators->destroy(this->validators);
1083 this->lock->destroy(this->lock);
1084 this->queue_mutex->destroy(this->queue_mutex);
1085 free(this);
1086 }
1087
1088 /*
1089 * see header file
1090 */
1091 credential_manager_t *credential_manager_create()
1092 {
1093 private_credential_manager_t *this;
1094
1095 INIT(this,
1096 .public = {
1097 .create_cert_enumerator = _create_cert_enumerator,
1098 .create_shared_enumerator = _create_shared_enumerator,
1099 .create_cdp_enumerator = _create_cdp_enumerator,
1100 .get_cert = _get_cert,
1101 .get_shared = _get_shared,
1102 .get_private = _get_private,
1103 .create_trusted_enumerator = _create_trusted_enumerator,
1104 .create_public_enumerator = _create_public_enumerator,
1105 .flush_cache = _flush_cache,
1106 .cache_cert = _cache_cert,
1107 .issued_by = _issued_by,
1108 .add_set = _add_set,
1109 .remove_set = _remove_set,
1110 .add_local_set = _add_local_set,
1111 .remove_local_set = _remove_local_set,
1112 .add_validator = _add_validator,
1113 .remove_validator = _remove_validator,
1114 .destroy = _destroy,
1115 },
1116 .sets = linked_list_create(),
1117 .validators = linked_list_create(),
1118 .cache = cert_cache_create(),
1119 .cache_queue = linked_list_create(),
1120 .lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
1121 .queue_mutex = mutex_create(MUTEX_TYPE_DEFAULT),
1122 );
1123
1124 this->local_sets = thread_value_create((thread_cleanup_t)this->sets->destroy);
1125 this->sets->insert_first(this->sets, this->cache);
1126
1127 return &this->public;
1128 }