cfa33a746074b06eac4f16c0d75caaae0d8f4bf7
[strongswan.git] / src / libcharon / plugins / stroke / stroke_cred.c
1 /*
2 * Copyright (C) 2008 Tobias Brunner
3 * Copyright (C) 2008 Martin Willi
4 * Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <limits.h>
20 #include <glob.h>
21 #include <libgen.h>
22 #include <sys/mman.h>
23 #include <fcntl.h>
24 #include <errno.h>
25 #include <unistd.h>
26
27 #include "stroke_cred.h"
28 #include "stroke_shared_key.h"
29
30 #include <credentials/certificates/x509.h>
31 #include <credentials/certificates/crl.h>
32 #include <credentials/certificates/ac.h>
33 #include <credentials/sets/mem_cred.h>
34 #include <credentials/sets/callback_cred.h>
35 #include <utils/linked_list.h>
36 #include <utils/lexparser.h>
37 #include <threading/rwlock.h>
38 #include <daemon.h>
39
40 /* configuration directories and files */
41 #define CONFIG_DIR IPSEC_CONFDIR
42 #define IPSEC_D_DIR CONFIG_DIR "/ipsec.d"
43 #define PRIVATE_KEY_DIR IPSEC_D_DIR "/private"
44 #define CERTIFICATE_DIR IPSEC_D_DIR "/certs"
45 #define CA_CERTIFICATE_DIR IPSEC_D_DIR "/cacerts"
46 #define AA_CERTIFICATE_DIR IPSEC_D_DIR "/aacerts"
47 #define ATTR_CERTIFICATE_DIR IPSEC_D_DIR "/acerts"
48 #define OCSP_CERTIFICATE_DIR IPSEC_D_DIR "/ocspcerts"
49 #define CRL_DIR IPSEC_D_DIR "/crls"
50 #define SECRETS_FILE CONFIG_DIR "/ipsec.secrets"
51
52 #define MAX_SECRETS_RECURSION 10
53
54 typedef struct private_stroke_cred_t private_stroke_cred_t;
55
56 /**
57 * private data of stroke_cred
58 */
59 struct private_stroke_cred_t {
60
61 /**
62 * public functions
63 */
64 stroke_cred_t public;
65
66 /**
67 * list of trusted peer/signer/CA certificates (certificate_t)
68 */
69 linked_list_t *certs;
70
71 /**
72 * list of shared secrets (private_shared_key_t)
73 */
74 linked_list_t *shared;
75
76 /**
77 * list of private keys (private_key_t)
78 */
79 linked_list_t *private;
80
81 /**
82 * read-write lock to lists
83 */
84 rwlock_t *lock;
85
86 /**
87 * cache CRLs to disk?
88 */
89 bool cachecrl;
90 };
91
92 /**
93 * data to pass to various filters
94 */
95 typedef struct {
96 private_stroke_cred_t *this;
97 identification_t *id;
98 certificate_type_t type;
99 } id_data_t;
100
101 /**
102 * destroy id enumerator data and unlock list
103 */
104 static void id_data_destroy(id_data_t *data)
105 {
106 data->this->lock->unlock(data->this->lock);
107 free(data);
108 }
109
110 /**
111 * filter function for private key enumerator
112 */
113 static bool private_filter(id_data_t *data,
114 private_key_t **in, private_key_t **out)
115 {
116 private_key_t *key;
117
118 key = *in;
119 if (data->id == NULL)
120 {
121 *out = key;
122 return TRUE;
123 }
124 if (key->has_fingerprint(key, data->id->get_encoding(data->id)))
125 {
126 *out = key;
127 return TRUE;
128 }
129 return FALSE;
130 }
131
132 /**
133 * Implements credential_set_t.create_private_enumerator
134 */
135 static enumerator_t* create_private_enumerator(private_stroke_cred_t *this,
136 key_type_t type, identification_t *id)
137 {
138 id_data_t *data;
139
140 data = malloc_thing(id_data_t);
141 data->this = this;
142 data->id = id;
143
144 this->lock->read_lock(this->lock);
145 return enumerator_create_filter(this->private->create_enumerator(this->private),
146 (void*)private_filter, data,
147 (void*)id_data_destroy);
148 }
149
150 /**
151 * filter function for certs enumerator
152 */
153 static bool certs_filter(id_data_t *data, certificate_t **in, certificate_t **out)
154 {
155 public_key_t *public;
156 certificate_t *cert = *in;
157
158 if (data->type != CERT_ANY && data->type != cert->get_type(cert))
159 {
160 return FALSE;
161 }
162 if (data->id == NULL || cert->has_subject(cert, data->id))
163 {
164 *out = *in;
165 return TRUE;
166 }
167
168 public = cert->get_public_key(cert);
169 if (public)
170 {
171 if (public->has_fingerprint(public, data->id->get_encoding(data->id)))
172 {
173 public->destroy(public);
174 *out = *in;
175 return TRUE;
176 }
177 public->destroy(public);
178 }
179 return FALSE;
180 }
181
182 /**
183 * Implements credential_set_t.create_cert_enumerator
184 */
185 static enumerator_t* create_cert_enumerator(private_stroke_cred_t *this,
186 certificate_type_t cert, key_type_t key,
187 identification_t *id, bool trusted)
188 {
189 id_data_t *data;
190
191 if (trusted && (cert == CERT_X509_CRL || cert == CERT_X509_AC))
192 {
193 return NULL;
194 }
195 data = malloc_thing(id_data_t);
196 data->this = this;
197 data->id = id;
198 data->type = cert;
199
200 this->lock->read_lock(this->lock);
201 return enumerator_create_filter(this->certs->create_enumerator(this->certs),
202 (void*)certs_filter, data,
203 (void*)id_data_destroy);
204 }
205
206 typedef struct {
207 private_stroke_cred_t *this;
208 identification_t *me;
209 identification_t *other;
210 shared_key_type_t type;
211 } shared_data_t;
212
213 /**
214 * free shared key enumerator data and unlock list
215 */
216 static void shared_data_destroy(shared_data_t *data)
217 {
218 data->this->lock->unlock(data->this->lock);
219 free(data);
220 }
221
222 /**
223 * filter function for certs enumerator
224 */
225 static bool shared_filter(shared_data_t *data,
226 stroke_shared_key_t **in, shared_key_t **out,
227 void **unused1, id_match_t *me,
228 void **unused2, id_match_t *other)
229 {
230 id_match_t my_match = ID_MATCH_NONE, other_match = ID_MATCH_NONE;
231 stroke_shared_key_t *stroke = *in;
232 shared_key_t *shared = &stroke->shared;
233
234 if (data->type != SHARED_ANY && shared->get_type(shared) != data->type)
235 {
236 return FALSE;
237 }
238
239 if (data->me)
240 {
241 my_match = stroke->has_owner(stroke, data->me);
242 }
243 if (data->other)
244 {
245 other_match = stroke->has_owner(stroke, data->other);
246 }
247 if ((data->me || data->other) && (!my_match && !other_match))
248 {
249 return FALSE;
250 }
251 *out = shared;
252 if (me)
253 {
254 *me = my_match;
255 }
256 if (other)
257 {
258 *other = other_match;
259 }
260 return TRUE;
261 }
262
263 /**
264 * Implements credential_set_t.create_shared_enumerator
265 */
266 static enumerator_t* create_shared_enumerator(private_stroke_cred_t *this,
267 shared_key_type_t type, identification_t *me,
268 identification_t *other)
269 {
270 shared_data_t *data = malloc_thing(shared_data_t);
271
272 data->this = this;
273 data->me = me;
274 data->other = other;
275 data->type = type;
276 this->lock->read_lock(this->lock);
277 return enumerator_create_filter(this->shared->create_enumerator(this->shared),
278 (void*)shared_filter, data,
279 (void*)shared_data_destroy);
280 }
281
282 /**
283 * Add a certificate to chain
284 */
285 static certificate_t* add_cert(private_stroke_cred_t *this, certificate_t *cert)
286 {
287 certificate_t *current;
288 enumerator_t *enumerator;
289 bool new = TRUE;
290
291 this->lock->read_lock(this->lock);
292 enumerator = this->certs->create_enumerator(this->certs);
293 while (enumerator->enumerate(enumerator, (void**)&current))
294 {
295 if (current->equals(current, cert))
296 {
297 /* cert already in queue */
298 cert->destroy(cert);
299 cert = current;
300 new = FALSE;
301 break;
302 }
303 }
304 enumerator->destroy(enumerator);
305
306 if (new)
307 {
308 this->certs->insert_last(this->certs, cert);
309 }
310 this->lock->unlock(this->lock);
311 return cert;
312 }
313
314 /**
315 * Implementation of stroke_cred_t.load_ca.
316 */
317 static certificate_t* load_ca(private_stroke_cred_t *this, char *filename)
318 {
319 certificate_t *cert;
320 char path[PATH_MAX];
321
322 if (*filename == '/')
323 {
324 snprintf(path, sizeof(path), "%s", filename);
325 }
326 else
327 {
328 snprintf(path, sizeof(path), "%s/%s", CA_CERTIFICATE_DIR, filename);
329 }
330
331 cert = lib->creds->create(lib->creds,
332 CRED_CERTIFICATE, CERT_X509,
333 BUILD_FROM_FILE, path,
334 BUILD_END);
335 if (cert)
336 {
337 x509_t *x509 = (x509_t*)cert;
338
339 if (!(x509->get_flags(x509) & X509_CA))
340 {
341 DBG1(DBG_CFG, " ca certificate \"%Y\" misses ca basic constraint, "
342 "discarded", cert->get_subject(cert));
343 cert->destroy(cert);
344 return NULL;
345 }
346 return (certificate_t*)add_cert(this, cert);
347 }
348 return NULL;
349 }
350
351 /**
352 * Add X.509 CRL to chain
353 */
354 static bool add_crl(private_stroke_cred_t *this, crl_t* crl)
355 {
356 certificate_t *current, *cert = &crl->certificate;
357 enumerator_t *enumerator;
358 bool new = TRUE, found = FALSE;
359
360 this->lock->write_lock(this->lock);
361 enumerator = this->certs->create_enumerator(this->certs);
362 while (enumerator->enumerate(enumerator, (void**)&current))
363 {
364 if (current->get_type(current) == CERT_X509_CRL)
365 {
366 crl_t *crl_c = (crl_t*)current;
367 chunk_t authkey = crl->get_authKeyIdentifier(crl);
368 chunk_t authkey_c = crl_c->get_authKeyIdentifier(crl_c);
369
370 /* if compare authorityKeyIdentifiers if available */
371 if (authkey.ptr && authkey_c.ptr && chunk_equals(authkey, authkey_c))
372 {
373 found = TRUE;
374 }
375 else
376 {
377 identification_t *issuer = cert->get_issuer(cert);
378 identification_t *issuer_c = current->get_issuer(current);
379
380 /* otherwise compare issuer distinguished names */
381 if (issuer->equals(issuer, issuer_c))
382 {
383 found = TRUE;
384 }
385 }
386 if (found)
387 {
388 new = crl_is_newer(crl, crl_c);
389 if (new)
390 {
391 this->certs->remove_at(this->certs, enumerator);
392 }
393 else
394 {
395 cert->destroy(cert);
396 }
397 break;
398 }
399 }
400 }
401 enumerator->destroy(enumerator);
402
403 if (new)
404 {
405 this->certs->insert_last(this->certs, cert);
406 }
407 this->lock->unlock(this->lock);
408 return new;
409 }
410
411 /**
412 * Add X.509 attribute certificate to chain
413 */
414 static bool add_ac(private_stroke_cred_t *this, ac_t* ac)
415 {
416 certificate_t *cert = &ac->certificate;
417
418 this->lock->write_lock(this->lock);
419 this->certs->insert_last(this->certs, cert);
420 this->lock->unlock(this->lock);
421 return TRUE;
422 }
423
424 /**
425 * Implementation of stroke_cred_t.load_peer.
426 */
427 static certificate_t* load_peer(private_stroke_cred_t *this, char *filename)
428 {
429 certificate_t *cert;
430 char path[PATH_MAX];
431
432 if (*filename == '/')
433 {
434 snprintf(path, sizeof(path), "%s", filename);
435 }
436 else
437 {
438 snprintf(path, sizeof(path), "%s/%s", CERTIFICATE_DIR, filename);
439 }
440
441 cert = lib->creds->create(lib->creds,
442 CRED_CERTIFICATE, CERT_ANY,
443 BUILD_FROM_FILE, path,
444 BUILD_END);
445 if (cert)
446 {
447 cert = add_cert(this, cert);
448 DBG1(DBG_CFG, " loaded certificate \"%Y\" from '%s'",
449 cert->get_subject(cert), filename);
450 return cert->get_ref(cert);
451 }
452 DBG1(DBG_CFG, " loading certificate from '%s' failed", filename);
453 return NULL;
454 }
455
456 /**
457 * load trusted certificates from a directory
458 */
459 static void load_certdir(private_stroke_cred_t *this, char *path,
460 certificate_type_t type, x509_flag_t flag)
461 {
462 struct stat st;
463 char *file;
464
465 enumerator_t *enumerator = enumerator_create_directory(path);
466
467 if (!enumerator)
468 {
469 DBG1(DBG_CFG, " reading directory failed");
470 return;
471 }
472
473 while (enumerator->enumerate(enumerator, NULL, &file, &st))
474 {
475 certificate_t *cert;
476
477 if (!S_ISREG(st.st_mode))
478 {
479 /* skip special file */
480 continue;
481 }
482 switch (type)
483 {
484 case CERT_X509:
485 if (flag & X509_CA)
486 { /* for CA certificates, we strictly require
487 * the CA basic constraint to be set */
488 cert = lib->creds->create(lib->creds,
489 CRED_CERTIFICATE, CERT_X509,
490 BUILD_FROM_FILE, file, BUILD_END);
491 if (cert)
492 {
493 x509_t *x509 = (x509_t*)cert;
494
495 if (!(x509->get_flags(x509) & X509_CA))
496 {
497 DBG1(DBG_CFG, " ca certificate \"%Y\" lacks "
498 "ca basic constraint, discarded",
499 cert->get_subject(cert));
500 cert->destroy(cert);
501 cert = NULL;
502 }
503 else
504 {
505 DBG1(DBG_CFG, " loaded ca certificate \"%Y\" from '%s'",
506 cert->get_subject(cert), file);
507 }
508 }
509 else
510 {
511 DBG1(DBG_CFG, " loading ca certificate from '%s' "
512 "failed", file);
513 }
514 }
515 else
516 { /* for all other flags, we add them to the certificate. */
517 cert = lib->creds->create(lib->creds,
518 CRED_CERTIFICATE, CERT_X509,
519 BUILD_FROM_FILE, file,
520 BUILD_X509_FLAG, flag, BUILD_END);
521 if (cert)
522 {
523 DBG1(DBG_CFG, " loaded certificate \"%Y\" from '%s'",
524 cert->get_subject(cert), file);
525 }
526 else
527 {
528 DBG1(DBG_CFG, " loading certificate from '%s' "
529 "failed", file);
530 }
531 }
532 if (cert)
533 {
534 add_cert(this, cert);
535 }
536 break;
537 case CERT_X509_CRL:
538 cert = lib->creds->create(lib->creds,
539 CRED_CERTIFICATE, CERT_X509_CRL,
540 BUILD_FROM_FILE, file,
541 BUILD_END);
542 if (cert)
543 {
544 add_crl(this, (crl_t*)cert);
545 DBG1(DBG_CFG, " loaded crl from '%s'", file);
546 }
547 else
548 {
549 DBG1(DBG_CFG, " loading crl from '%s' failed", file);
550 }
551 break;
552 case CERT_X509_AC:
553 cert = lib->creds->create(lib->creds,
554 CRED_CERTIFICATE, CERT_X509_AC,
555 BUILD_FROM_FILE, file,
556 BUILD_END);
557 if (cert)
558 {
559 add_ac(this, (ac_t*)cert);
560 DBG1(DBG_CFG, " loaded attribute certificate from '%s'",
561 file);
562 }
563 else
564 {
565 DBG1(DBG_CFG, " loading attribute certificate from '%s' "
566 "failed", file);
567 }
568 break;
569 default:
570 break;
571 }
572 }
573 enumerator->destroy(enumerator);
574 }
575
576 /**
577 * Implementation of credential_set_t.cache_cert.
578 */
579 static void cache_cert(private_stroke_cred_t *this, certificate_t *cert)
580 {
581 if (cert->get_type(cert) == CERT_X509_CRL && this->cachecrl)
582 {
583 /* CRLs get written to /etc/ipsec.d/crls/<authkeyId>.crl */
584 crl_t *crl = (crl_t*)cert;
585
586 cert->get_ref(cert);
587 if (add_crl(this, crl))
588 {
589 char buf[BUF_LEN];
590 chunk_t chunk, hex;
591
592 chunk = crl->get_authKeyIdentifier(crl);
593 hex = chunk_to_hex(chunk, NULL, FALSE);
594 snprintf(buf, sizeof(buf), "%s/%s.crl", CRL_DIR, hex);
595 free(hex.ptr);
596
597 if (cert->get_encoding(cert, CERT_ASN1_DER, &chunk))
598 {
599 chunk_write(chunk, buf, "crl", 022, TRUE);
600 free(chunk.ptr);
601 }
602 }
603 }
604 }
605
606 /**
607 * Implementation of stroke_cred_t.cachecrl.
608 */
609 static void cachecrl(private_stroke_cred_t *this, bool enabled)
610 {
611 DBG1(DBG_CFG, "crl caching to %s %s",
612 CRL_DIR, enabled ? "enabled" : "disabled");
613 this->cachecrl = enabled;
614 }
615
616
617 /**
618 * Convert a string of characters into a binary secret
619 * A string between single or double quotes is treated as ASCII characters
620 * A string prepended by 0x is treated as HEX and prepended by 0s as Base64
621 */
622 static err_t extract_secret(chunk_t *secret, chunk_t *line)
623 {
624 chunk_t raw_secret;
625 char delimiter = ' ';
626 bool quotes = FALSE;
627
628 if (!eat_whitespace(line))
629 {
630 return "missing secret";
631 }
632
633 if (*line->ptr == '\'' || *line->ptr == '"')
634 {
635 quotes = TRUE;
636 delimiter = *line->ptr;
637 line->ptr++; line->len--;
638 }
639
640 if (!extract_token(&raw_secret, delimiter, line))
641 {
642 if (delimiter == ' ')
643 {
644 raw_secret = *line;
645 }
646 else
647 {
648 return "missing second delimiter";
649 }
650 }
651
652 if (quotes)
653 {
654 /* treat as an ASCII string */
655 *secret = chunk_clone(raw_secret);
656 return NULL;
657 }
658 /* treat 0x as hex, 0s as base64 */
659 if (raw_secret.len > 2)
660 {
661 if (strncasecmp("0x", raw_secret.ptr, 2) == 0)
662 {
663 *secret = chunk_from_hex(chunk_skip(raw_secret, 2), NULL);
664 return NULL;
665 }
666 if (strncasecmp("0s", raw_secret.ptr, 2) == 0)
667 {
668 *secret = chunk_from_base64(chunk_skip(raw_secret, 2), NULL);
669 return NULL;
670 }
671 }
672 *secret = chunk_clone(raw_secret);
673 return NULL;
674 }
675
676 /**
677 * Data to pass to passphrase_cb
678 */
679 typedef struct {
680 /** socket we use for prompting */
681 FILE *prompt;
682 /** private key file */
683 char *file;
684 /** buffer for passphrase */
685 char buf[256];
686 } passphrase_cb_data_t;
687
688 /**
689 * Passphrase callback to read from stroke fd
690 */
691 chunk_t passphrase_cb(passphrase_cb_data_t *data, int try)
692 {
693 chunk_t secret = chunk_empty;;
694
695 if (try > 5)
696 {
697 fprintf(data->prompt, "invalid passphrase, too many trials\n");
698 return chunk_empty;
699 }
700 if (try == 1)
701 {
702 fprintf(data->prompt, "Private key '%s' is encrypted\n", data->file);
703 }
704 else
705 {
706 fprintf(data->prompt, "invalid passphrase\n");
707 }
708 fprintf(data->prompt, "Passphrase:\n");
709 if (fgets(data->buf, sizeof(data->buf), data->prompt))
710 {
711 secret = chunk_create(data->buf, strlen(data->buf));
712 if (secret.len)
713 { /* trim appended \n */
714 secret.len--;
715 }
716 }
717 return secret;
718 }
719
720 /**
721 * Data for PIN callback
722 */
723 typedef struct {
724 /** socket we use for prompting */
725 FILE *prompt;
726 /** card label */
727 char *card;
728 /** card keyid */
729 chunk_t keyid;
730 /** number of tries */
731 int try;
732 } pin_cb_data_t;
733
734 /**
735 * Callback function to receive PINs
736 */
737 static shared_key_t* pin_cb(pin_cb_data_t *data,
738 identification_t *me, identification_t *other,
739 id_match_t *match_me, id_match_t *match_other)
740 {
741 chunk_t secret;
742 char buf[256];
743
744 if (!me || !chunk_equals(me->get_encoding(me), data->keyid))
745 {
746 return NULL;
747 }
748
749 if (data->try > 1)
750 {
751 fprintf(data->prompt, "PIN invalid, giving up.\n", data->card);
752 return NULL;
753 }
754 data->try++;
755 fprintf(data->prompt, "Login to '%s' required\n", data->card);
756 fprintf(data->prompt, "PIN:\n");
757 if (fgets(buf, sizeof(buf), data->prompt))
758 {
759 secret = chunk_create(buf, strlen(buf));
760 if (secret.len > 1)
761 { /* trim appended \n */
762 secret.len--;
763 if (match_me)
764 {
765 *match_me = ID_MATCH_PERFECT;
766 }
767 if (match_other)
768 {
769 *match_other = ID_MATCH_NONE;
770 }
771 return shared_key_create(SHARED_PIN, chunk_clone(secret));
772 }
773 }
774 return NULL;
775 }
776
777 /**
778 * Load a smartcard with a PIN
779 */
780 static bool load_pin(private_stroke_cred_t *this, chunk_t line, int line_nr,
781 FILE *prompt)
782 {
783 chunk_t sc = chunk_empty, secret = chunk_empty;
784 char smartcard[64], keyid[64], module[64], *pos;
785 private_key_t *key = NULL;
786 u_int slot;
787 chunk_t chunk;
788 shared_key_t *shared;
789 identification_t *id;
790 mem_cred_t *mem = NULL;
791 callback_cred_t *cb = NULL;
792 pin_cb_data_t pin_data;
793 enum {
794 SC_FORMAT_SLOT_MODULE_KEYID,
795 SC_FORMAT_SLOT_KEYID,
796 SC_FORMAT_KEYID,
797 } format;
798
799 err_t ugh = extract_value(&sc, &line);
800
801 if (ugh != NULL)
802 {
803 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
804 return FALSE;
805 }
806 if (sc.len == 0)
807 {
808 DBG1(DBG_CFG, "line %d: expected %%smartcard specifier", line_nr);
809 return FALSE;
810 }
811 snprintf(smartcard, sizeof(smartcard), "%.*s", sc.len, sc.ptr);
812 smartcard[sizeof(smartcard) - 1] = '\0';
813
814 /* parse slot and key id. Three formats are supported:
815 * - %smartcard<slot>@<module>:<keyid>
816 * - %smartcard<slot>:<keyid>
817 * - %smartcard:<keyid>
818 */
819 if (sscanf(smartcard, "%%smartcard%u@%s", &slot, module) == 2)
820 {
821 pos = strchr(module, ':');
822 if (!pos)
823 {
824 DBG1(DBG_CFG, "line %d: the given %%smartcard specifier is "
825 "invalid", line_nr);
826 return FALSE;
827 }
828 *pos = '\0';
829 strcpy(keyid, pos + 1);
830 format = SC_FORMAT_SLOT_MODULE_KEYID;
831 }
832 else if (sscanf(smartcard, "%%smartcard%u:%s", &slot, keyid) == 2)
833 {
834 format = SC_FORMAT_SLOT_KEYID;
835 }
836 else if (sscanf(smartcard, "%%smartcard:%s", keyid) == 1)
837 {
838 format = SC_FORMAT_KEYID;
839 }
840 else
841 {
842 DBG1(DBG_CFG, "line %d: the given %%smartcard specifier is not"
843 " supported or invalid", line_nr);
844 return FALSE;
845 }
846
847 if (!eat_whitespace(&line))
848 {
849 DBG1(DBG_CFG, "line %d: expected PIN", line_nr);
850 return FALSE;
851 }
852 ugh = extract_secret(&secret, &line);
853 if (ugh != NULL)
854 {
855 DBG1(DBG_CFG, "line %d: malformed PIN: %s", line_nr, ugh);
856 return FALSE;
857 }
858
859 chunk = chunk_from_hex(chunk_create(keyid, strlen(keyid)), NULL);
860 if (secret.len == 7 && strneq(secret.ptr, "%prompt", 7))
861 {
862 if (!prompt)
863 { /* no IO channel to prompt, skip */
864 free(chunk.ptr);
865 return TRUE;
866 }
867 /* use callback credential set to prompt for the pin */
868 pin_data.prompt = prompt;
869 pin_data.card = smartcard;
870 pin_data.keyid = chunk;
871 pin_data.try = 1;
872 cb = callback_cred_create_shared((void*)pin_cb, &pin_data);
873 lib->credmgr->add_local_set(lib->credmgr, &cb->set);
874 }
875 else
876 {
877 /* provide our pin in a temporary credential set */
878 shared = shared_key_create(SHARED_PIN, secret);
879 id = identification_create_from_encoding(ID_KEY_ID, chunk);
880 mem = mem_cred_create();
881 mem->add_shared(mem, shared, id, NULL);
882 lib->credmgr->add_local_set(lib->credmgr, &mem->set);
883 }
884
885 /* unlock: smartcard needs the pin and potentially calls public set */
886 this->lock->unlock(this->lock);
887 switch (format)
888 {
889 case SC_FORMAT_SLOT_MODULE_KEYID:
890 key = lib->creds->create(lib->creds,
891 CRED_PRIVATE_KEY, KEY_ANY,
892 BUILD_PKCS11_SLOT, slot,
893 BUILD_PKCS11_MODULE, module,
894 BUILD_PKCS11_KEYID, chunk, BUILD_END);
895 break;
896 case SC_FORMAT_SLOT_KEYID:
897 key = lib->creds->create(lib->creds,
898 CRED_PRIVATE_KEY, KEY_ANY,
899 BUILD_PKCS11_SLOT, slot,
900 BUILD_PKCS11_KEYID, chunk, BUILD_END);
901 break;
902 case SC_FORMAT_KEYID:
903 key = lib->creds->create(lib->creds,
904 CRED_PRIVATE_KEY, KEY_ANY,
905 BUILD_PKCS11_KEYID, chunk, BUILD_END);
906 break;
907 }
908 this->lock->write_lock(this->lock);
909 if (mem)
910 {
911 lib->credmgr->remove_local_set(lib->credmgr, &mem->set);
912 mem->destroy(mem);
913 }
914 if (cb)
915 {
916 lib->credmgr->remove_local_set(lib->credmgr, &cb->set);
917 cb->destroy(cb);
918 }
919
920 if (key)
921 {
922 DBG1(DBG_CFG, " loaded private key from %.*s", sc.len, sc.ptr);
923 this->private->insert_last(this->private, key);
924 }
925 return TRUE;
926 }
927
928 /**
929 * Load a private key
930 */
931 static bool load_private(private_stroke_cred_t *this, chunk_t line, int line_nr,
932 FILE *prompt, key_type_t key_type)
933 {
934 char path[PATH_MAX];
935 chunk_t filename;
936 chunk_t secret = chunk_empty;
937 private_key_t *key = NULL;
938
939 err_t ugh = extract_value(&filename, &line);
940
941 if (ugh != NULL)
942 {
943 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
944 return FALSE;
945 }
946 if (filename.len == 0)
947 {
948 DBG1(DBG_CFG, "line %d: empty filename", line_nr);
949 return FALSE;
950 }
951 if (*filename.ptr == '/')
952 {
953 /* absolute path name */
954 snprintf(path, sizeof(path), "%.*s", filename.len, filename.ptr);
955 }
956 else
957 {
958 /* relative path name */
959 snprintf(path, sizeof(path), "%s/%.*s", PRIVATE_KEY_DIR,
960 filename.len, filename.ptr);
961 }
962
963 /* check for optional passphrase */
964 if (eat_whitespace(&line))
965 {
966 ugh = extract_secret(&secret, &line);
967 if (ugh != NULL)
968 {
969 DBG1(DBG_CFG, "line %d: malformed passphrase: %s", line_nr, ugh);
970 return FALSE;
971 }
972 }
973 if (secret.len == 7 && strneq(secret.ptr, "%prompt", 7))
974 {
975 if (prompt)
976 {
977 passphrase_cb_data_t data = {
978 .prompt = prompt,
979 .file = path,
980 };
981 key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY,
982 key_type, BUILD_FROM_FILE, path,
983 BUILD_PASSPHRASE_CALLBACK,
984 passphrase_cb, &data, BUILD_END);
985 }
986 }
987 else
988 {
989 key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, key_type,
990 BUILD_FROM_FILE, path,
991 BUILD_PASSPHRASE, secret, BUILD_END);
992 }
993 if (key)
994 {
995 DBG1(DBG_CFG, " loaded %N private key from '%s'",
996 key_type_names, key->get_type(key), path);
997 this->private->insert_last(this->private, key);
998 }
999 else
1000 {
1001 DBG1(DBG_CFG, " loading private key from '%s' failed", path);
1002 }
1003 chunk_clear(&secret);
1004 return TRUE;
1005 }
1006
1007 /**
1008 * Load a shared key
1009 */
1010 static bool load_shared(private_stroke_cred_t *this, chunk_t line, int line_nr,
1011 shared_key_type_t type, chunk_t ids)
1012 {
1013 stroke_shared_key_t *shared_key;
1014 chunk_t secret = chunk_empty;
1015 bool any = TRUE;
1016
1017 err_t ugh = extract_secret(&secret, &line);
1018 if (ugh != NULL)
1019 {
1020 DBG1(DBG_CFG, "line %d: malformed secret: %s", line_nr, ugh);
1021 return FALSE;
1022 }
1023 shared_key = stroke_shared_key_create(type, secret);
1024 DBG1(DBG_CFG, " loaded %N secret for %s", shared_key_type_names, type,
1025 ids.len > 0 ? (char*)ids.ptr : "%any");
1026 DBG4(DBG_CFG, " secret: %#B", &secret);
1027
1028 this->shared->insert_last(this->shared, shared_key);
1029 while (ids.len > 0)
1030 {
1031 chunk_t id;
1032 identification_t *peer_id;
1033
1034 ugh = extract_value(&id, &ids);
1035 if (ugh != NULL)
1036 {
1037 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
1038 return FALSE;
1039 }
1040 if (id.len == 0)
1041 {
1042 continue;
1043 }
1044
1045 /* NULL terminate the ID string */
1046 *(id.ptr + id.len) = '\0';
1047 peer_id = identification_create_from_string(id.ptr);
1048 if (peer_id->get_type(peer_id) == ID_ANY)
1049 {
1050 peer_id->destroy(peer_id);
1051 continue;
1052 }
1053
1054 shared_key->add_owner(shared_key, peer_id);
1055 any = FALSE;
1056 }
1057 if (any)
1058 {
1059 shared_key->add_owner(shared_key,
1060 identification_create_from_encoding(ID_ANY, chunk_empty));
1061 }
1062 return TRUE;
1063 }
1064
1065 /**
1066 * reload ipsec.secrets
1067 */
1068 static void load_secrets(private_stroke_cred_t *this, char *file, int level,
1069 FILE *prompt)
1070 {
1071 int line_nr = 0, fd;
1072 chunk_t src, line;
1073 private_key_t *private;
1074 shared_key_t *shared;
1075 struct stat sb;
1076 void *addr;
1077
1078 DBG1(DBG_CFG, "loading secrets from '%s'", file);
1079 fd = open(file, O_RDONLY);
1080 if (fd == -1)
1081 {
1082 DBG1(DBG_CFG, "opening secrets file '%s' failed: %s", file,
1083 strerror(errno));
1084 return;
1085 }
1086 if (fstat(fd, &sb) == -1)
1087 {
1088 DBG1(DBG_LIB, "getting file size of '%s' failed: %s", file,
1089 strerror(errno));
1090 close(fd);
1091 return;
1092 }
1093 addr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
1094 if (addr == MAP_FAILED)
1095 {
1096 DBG1(DBG_LIB, "mapping '%s' failed: %s", file, strerror(errno));
1097 close(fd);
1098 return;
1099 }
1100 src = chunk_create(addr, sb.st_size);
1101
1102 if (level == 0)
1103 {
1104 this->lock->write_lock(this->lock);
1105
1106 /* flush secrets on non-recursive invocation */
1107 while (this->shared->remove_last(this->shared,
1108 (void**)&shared) == SUCCESS)
1109 {
1110 shared->destroy(shared);
1111 }
1112 while (this->private->remove_last(this->private,
1113 (void**)&private) == SUCCESS)
1114 {
1115 private->destroy(private);
1116 }
1117 }
1118
1119 while (fetchline(&src, &line))
1120 {
1121 chunk_t ids, token;
1122 shared_key_type_t type;
1123
1124 line_nr++;
1125
1126 if (!eat_whitespace(&line))
1127 {
1128 continue;
1129 }
1130 if (line.len > strlen("include ") &&
1131 strneq(line.ptr, "include ", strlen("include ")))
1132 {
1133 glob_t buf;
1134 char **expanded, *dir, pattern[PATH_MAX];
1135 u_char *pos;
1136
1137 if (level > MAX_SECRETS_RECURSION)
1138 {
1139 DBG1(DBG_CFG, "maximum level of %d includes reached, ignored",
1140 MAX_SECRETS_RECURSION);
1141 continue;
1142 }
1143 /* terminate filename by space */
1144 line = chunk_skip(line, strlen("include "));
1145 pos = memchr(line.ptr, ' ', line.len);
1146 if (pos)
1147 {
1148 line.len = pos - line.ptr;
1149 }
1150 if (line.len && line.ptr[0] == '/')
1151 {
1152 if (line.len + 1 > sizeof(pattern))
1153 {
1154 DBG1(DBG_CFG, "include pattern too long, ignored");
1155 continue;
1156 }
1157 snprintf(pattern, sizeof(pattern), "%.*s", line.len, line.ptr);
1158 }
1159 else
1160 { /* use directory of current file if relative */
1161 dir = strdup(file);
1162 dir = dirname(dir);
1163
1164 if (line.len + 1 + strlen(dir) + 1 > sizeof(pattern))
1165 {
1166 DBG1(DBG_CFG, "include pattern too long, ignored");
1167 free(dir);
1168 continue;
1169 }
1170 snprintf(pattern, sizeof(pattern), "%s/%.*s",
1171 dir, line.len, line.ptr);
1172 free(dir);
1173 }
1174 if (glob(pattern, GLOB_ERR, NULL, &buf) != 0)
1175 {
1176 DBG1(DBG_CFG, "expanding file expression '%s' failed", pattern);
1177 globfree(&buf);
1178 }
1179 else
1180 {
1181 for (expanded = buf.gl_pathv; *expanded != NULL; expanded++)
1182 {
1183 load_secrets(this, *expanded, level + 1, prompt);
1184 }
1185 }
1186 globfree(&buf);
1187 continue;
1188 }
1189
1190 if (line.len > 2 && strneq(": ", line.ptr, 2))
1191 {
1192 /* no ids, skip the ':' */
1193 ids = chunk_empty;
1194 line.ptr++;
1195 line.len--;
1196 }
1197 else if (extract_token_str(&ids, " : ", &line))
1198 {
1199 /* NULL terminate the extracted id string */
1200 *(ids.ptr + ids.len) = '\0';
1201 }
1202 else
1203 {
1204 DBG1(DBG_CFG, "line %d: missing ' : ' separator", line_nr);
1205 break;
1206 }
1207
1208 if (!eat_whitespace(&line) || !extract_token(&token, ' ', &line))
1209 {
1210 DBG1(DBG_CFG, "line %d: missing token", line_nr);
1211 break;
1212 }
1213 if (match("RSA", &token) || match("ECDSA", &token))
1214 {
1215 if (!load_private(this, line, line_nr, prompt,
1216 match("RSA", &token) ? KEY_RSA : KEY_ECDSA))
1217 {
1218 break;
1219 }
1220 }
1221 else if (match("PIN", &token))
1222 {
1223 if (!load_pin(this, line, line_nr, prompt))
1224 {
1225 break;
1226 }
1227 }
1228 else if ((match("PSK", &token) && (type = SHARED_IKE)) ||
1229 (match("EAP", &token) && (type = SHARED_EAP)) ||
1230 (match("NTLM", &token) && (type = SHARED_NT_HASH)) ||
1231 (match("XAUTH", &token) && (type = SHARED_EAP)))
1232 {
1233 if (!load_shared(this, line, line_nr, type, ids))
1234 {
1235 break;
1236 }
1237 }
1238 else
1239 {
1240 DBG1(DBG_CFG, "line %d: token must be either "
1241 "RSA, ECDSA, PSK, EAP, XAUTH or PIN", line_nr);
1242 break;
1243 }
1244 }
1245 if (level == 0)
1246 {
1247 this->lock->unlock(this->lock);
1248 }
1249 munmap(addr, sb.st_size);
1250 close(fd);
1251 }
1252
1253 /**
1254 * load all certificates from ipsec.d
1255 */
1256 static void load_certs(private_stroke_cred_t *this)
1257 {
1258 DBG1(DBG_CFG, "loading ca certificates from '%s'",
1259 CA_CERTIFICATE_DIR);
1260 load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
1261
1262 DBG1(DBG_CFG, "loading aa certificates from '%s'",
1263 AA_CERTIFICATE_DIR);
1264 load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
1265
1266 DBG1(DBG_CFG, "loading ocsp signer certificates from '%s'",
1267 OCSP_CERTIFICATE_DIR);
1268 load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509, X509_OCSP_SIGNER);
1269
1270 DBG1(DBG_CFG, "loading attribute certificates from '%s'",
1271 ATTR_CERTIFICATE_DIR);
1272 load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
1273
1274 DBG1(DBG_CFG, "loading crls from '%s'",
1275 CRL_DIR);
1276 load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
1277 }
1278
1279 /**
1280 * Implementation of stroke_cred_t.reread.
1281 */
1282 static void reread(private_stroke_cred_t *this, stroke_msg_t *msg, FILE *prompt)
1283 {
1284 if (msg->reread.flags & REREAD_SECRETS)
1285 {
1286 DBG1(DBG_CFG, "rereading secrets");
1287 load_secrets(this, SECRETS_FILE, 0, prompt);
1288 }
1289 if (msg->reread.flags & REREAD_CACERTS)
1290 {
1291 DBG1(DBG_CFG, "rereading ca certificates from '%s'",
1292 CA_CERTIFICATE_DIR);
1293 load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
1294 }
1295 if (msg->reread.flags & REREAD_OCSPCERTS)
1296 {
1297 DBG1(DBG_CFG, "rereading ocsp signer certificates from '%s'",
1298 OCSP_CERTIFICATE_DIR);
1299 load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509,
1300 X509_OCSP_SIGNER);
1301 }
1302 if (msg->reread.flags & REREAD_AACERTS)
1303 {
1304 DBG1(DBG_CFG, "rereading aa certificates from '%s'",
1305 AA_CERTIFICATE_DIR);
1306 load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
1307 }
1308 if (msg->reread.flags & REREAD_ACERTS)
1309 {
1310 DBG1(DBG_CFG, "rereading attribute certificates from '%s'",
1311 ATTR_CERTIFICATE_DIR);
1312 load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
1313 }
1314 if (msg->reread.flags & REREAD_CRLS)
1315 {
1316 DBG1(DBG_CFG, "rereading crls from '%s'",
1317 CRL_DIR);
1318 load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
1319 }
1320 }
1321
1322 /**
1323 * Implementation of stroke_cred_t.destroy
1324 */
1325 static void destroy(private_stroke_cred_t *this)
1326 {
1327 this->certs->destroy_offset(this->certs, offsetof(certificate_t, destroy));
1328 this->shared->destroy_offset(this->shared, offsetof(shared_key_t, destroy));
1329 this->private->destroy_offset(this->private, offsetof(private_key_t, destroy));
1330 this->lock->destroy(this->lock);
1331 free(this);
1332 }
1333
1334 /*
1335 * see header file
1336 */
1337 stroke_cred_t *stroke_cred_create()
1338 {
1339 private_stroke_cred_t *this = malloc_thing(private_stroke_cred_t);
1340
1341 this->public.set.create_private_enumerator = (void*)create_private_enumerator;
1342 this->public.set.create_cert_enumerator = (void*)create_cert_enumerator;
1343 this->public.set.create_shared_enumerator = (void*)create_shared_enumerator;
1344 this->public.set.create_cdp_enumerator = (void*)return_null;
1345 this->public.set.cache_cert = (void*)cache_cert;
1346 this->public.reread = (void(*)(stroke_cred_t*, stroke_msg_t *msg, FILE*))reread;
1347 this->public.load_ca = (certificate_t*(*)(stroke_cred_t*, char *filename))load_ca;
1348 this->public.load_peer = (certificate_t*(*)(stroke_cred_t*, char *filename))load_peer;
1349 this->public.cachecrl = (void(*)(stroke_cred_t*, bool enabled))cachecrl;
1350 this->public.destroy = (void(*)(stroke_cred_t*))destroy;
1351
1352 this->certs = linked_list_create();
1353 this->shared = linked_list_create();
1354 this->private = linked_list_create();
1355 this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
1356
1357 load_certs(this);
1358 load_secrets(this, SECRETS_FILE, 0, NULL);
1359
1360 this->cachecrl = FALSE;
1361
1362 return &this->public;
1363 }
1364