Fixed loading of private keys without password.
[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 for passphrase callback
678 */
679 typedef struct {
680 /** socket we use for prompting */
681 FILE *prompt;
682 /** private key file */
683 char *path;
684 /** number of tries */
685 int try;
686 } passphrase_cb_data_t;
687
688 /**
689 * Callback function to receive Passphrases
690 */
691 static shared_key_t* passphrase_cb(passphrase_cb_data_t *data,
692 shared_key_type_t type,
693 identification_t *me, identification_t *other,
694 id_match_t *match_me, id_match_t *match_other)
695 {
696 chunk_t secret;
697 char buf[256];
698
699 if (type != SHARED_ANY && type != SHARED_PRIVATE_KEY_PASS)
700 {
701 return NULL;
702 }
703
704 if (data->try > 1)
705 {
706 if (data->try > 5)
707 {
708 fprintf(data->prompt, "PIN invalid, giving up.\n");
709 return NULL;
710 }
711 fprintf(data->prompt, "PIN invalid!\n");
712 }
713 data->try++;
714 fprintf(data->prompt, "Private key '%s' is encrypted.\n", data->path);
715 fprintf(data->prompt, "Passphrase:\n");
716 if (fgets(buf, sizeof(buf), data->prompt))
717 {
718 secret = chunk_create(buf, strlen(buf));
719 if (secret.len > 1)
720 { /* trim appended \n */
721 secret.len--;
722 if (match_me)
723 {
724 *match_me = ID_MATCH_PERFECT;
725 }
726 if (match_other)
727 {
728 *match_other = ID_MATCH_NONE;
729 }
730 return shared_key_create(SHARED_PRIVATE_KEY_PASS, chunk_clone(secret));
731 }
732 }
733 return NULL;
734 }
735
736 /**
737 * Data for PIN callback
738 */
739 typedef struct {
740 /** socket we use for prompting */
741 FILE *prompt;
742 /** card label */
743 char *card;
744 /** card keyid */
745 chunk_t keyid;
746 /** number of tries */
747 int try;
748 } pin_cb_data_t;
749
750 /**
751 * Callback function to receive PINs
752 */
753 static shared_key_t* pin_cb(pin_cb_data_t *data, shared_key_type_t type,
754 identification_t *me, identification_t *other,
755 id_match_t *match_me, id_match_t *match_other)
756 {
757 chunk_t secret;
758 char buf[256];
759
760 if (type != SHARED_ANY && type != SHARED_PIN)
761 {
762 return NULL;
763 }
764
765 if (!me || !chunk_equals(me->get_encoding(me), data->keyid))
766 {
767 return NULL;
768 }
769
770 if (data->try > 1)
771 {
772 fprintf(data->prompt, "PIN invalid, aborting.\n");
773 return NULL;
774 }
775 data->try++;
776 fprintf(data->prompt, "Login to '%s' required\n", data->card);
777 fprintf(data->prompt, "PIN:\n");
778 if (fgets(buf, sizeof(buf), data->prompt))
779 {
780 secret = chunk_create(buf, strlen(buf));
781 if (secret.len > 1)
782 { /* trim appended \n */
783 secret.len--;
784 if (match_me)
785 {
786 *match_me = ID_MATCH_PERFECT;
787 }
788 if (match_other)
789 {
790 *match_other = ID_MATCH_NONE;
791 }
792 return shared_key_create(SHARED_PIN, chunk_clone(secret));
793 }
794 }
795 return NULL;
796 }
797
798 /**
799 * Load a smartcard with a PIN
800 */
801 static bool load_pin(private_stroke_cred_t *this, chunk_t line, int line_nr,
802 FILE *prompt)
803 {
804 chunk_t sc = chunk_empty, secret = chunk_empty;
805 char smartcard[64], keyid[64], module[64], *pos;
806 private_key_t *key = NULL;
807 u_int slot;
808 chunk_t chunk;
809 shared_key_t *shared;
810 identification_t *id;
811 mem_cred_t *mem = NULL;
812 callback_cred_t *cb = NULL;
813 pin_cb_data_t pin_data;
814 enum {
815 SC_FORMAT_SLOT_MODULE_KEYID,
816 SC_FORMAT_SLOT_KEYID,
817 SC_FORMAT_KEYID,
818 } format;
819
820 err_t ugh = extract_value(&sc, &line);
821
822 if (ugh != NULL)
823 {
824 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
825 return FALSE;
826 }
827 if (sc.len == 0)
828 {
829 DBG1(DBG_CFG, "line %d: expected %%smartcard specifier", line_nr);
830 return FALSE;
831 }
832 snprintf(smartcard, sizeof(smartcard), "%.*s", sc.len, sc.ptr);
833 smartcard[sizeof(smartcard) - 1] = '\0';
834
835 /* parse slot and key id. Three formats are supported:
836 * - %smartcard<slot>@<module>:<keyid>
837 * - %smartcard<slot>:<keyid>
838 * - %smartcard:<keyid>
839 */
840 if (sscanf(smartcard, "%%smartcard%u@%s", &slot, module) == 2)
841 {
842 pos = strchr(module, ':');
843 if (!pos)
844 {
845 DBG1(DBG_CFG, "line %d: the given %%smartcard specifier is "
846 "invalid", line_nr);
847 return FALSE;
848 }
849 *pos = '\0';
850 strcpy(keyid, pos + 1);
851 format = SC_FORMAT_SLOT_MODULE_KEYID;
852 }
853 else if (sscanf(smartcard, "%%smartcard%u:%s", &slot, keyid) == 2)
854 {
855 format = SC_FORMAT_SLOT_KEYID;
856 }
857 else if (sscanf(smartcard, "%%smartcard:%s", keyid) == 1)
858 {
859 format = SC_FORMAT_KEYID;
860 }
861 else
862 {
863 DBG1(DBG_CFG, "line %d: the given %%smartcard specifier is not"
864 " supported or invalid", line_nr);
865 return FALSE;
866 }
867
868 if (!eat_whitespace(&line))
869 {
870 DBG1(DBG_CFG, "line %d: expected PIN", line_nr);
871 return FALSE;
872 }
873 ugh = extract_secret(&secret, &line);
874 if (ugh != NULL)
875 {
876 DBG1(DBG_CFG, "line %d: malformed PIN: %s", line_nr, ugh);
877 return FALSE;
878 }
879
880 chunk = chunk_from_hex(chunk_create(keyid, strlen(keyid)), NULL);
881 if (secret.len == 7 && strneq(secret.ptr, "%prompt", 7))
882 {
883 free(secret.ptr);
884 if (!prompt)
885 { /* no IO channel to prompt, skip */
886 free(chunk.ptr);
887 return TRUE;
888 }
889 /* use callback credential set to prompt for the pin */
890 pin_data.prompt = prompt;
891 pin_data.card = smartcard;
892 pin_data.keyid = chunk;
893 pin_data.try = 1;
894 cb = callback_cred_create_shared((void*)pin_cb, &pin_data);
895 lib->credmgr->add_local_set(lib->credmgr, &cb->set);
896 }
897 else
898 {
899 /* provide our pin in a temporary credential set */
900 shared = shared_key_create(SHARED_PIN, secret);
901 id = identification_create_from_encoding(ID_KEY_ID, chunk);
902 mem = mem_cred_create();
903 mem->add_shared(mem, shared, id, NULL);
904 lib->credmgr->add_local_set(lib->credmgr, &mem->set);
905 }
906
907 /* unlock: smartcard needs the pin and potentially calls public set */
908 this->lock->unlock(this->lock);
909 switch (format)
910 {
911 case SC_FORMAT_SLOT_MODULE_KEYID:
912 key = lib->creds->create(lib->creds,
913 CRED_PRIVATE_KEY, KEY_ANY,
914 BUILD_PKCS11_SLOT, slot,
915 BUILD_PKCS11_MODULE, module,
916 BUILD_PKCS11_KEYID, chunk, BUILD_END);
917 break;
918 case SC_FORMAT_SLOT_KEYID:
919 key = lib->creds->create(lib->creds,
920 CRED_PRIVATE_KEY, KEY_ANY,
921 BUILD_PKCS11_SLOT, slot,
922 BUILD_PKCS11_KEYID, chunk, BUILD_END);
923 break;
924 case SC_FORMAT_KEYID:
925 key = lib->creds->create(lib->creds,
926 CRED_PRIVATE_KEY, KEY_ANY,
927 BUILD_PKCS11_KEYID, chunk, BUILD_END);
928 break;
929 }
930 this->lock->write_lock(this->lock);
931 if (mem)
932 {
933 lib->credmgr->remove_local_set(lib->credmgr, &mem->set);
934 mem->destroy(mem);
935 }
936 if (cb)
937 {
938 lib->credmgr->remove_local_set(lib->credmgr, &cb->set);
939 cb->destroy(cb);
940 }
941
942 if (key)
943 {
944 DBG1(DBG_CFG, " loaded private key from %.*s", sc.len, sc.ptr);
945 this->private->insert_last(this->private, key);
946 }
947 return TRUE;
948 }
949
950 /**
951 * Load a private key
952 */
953 static bool load_private(private_stroke_cred_t *this, chunk_t line, int line_nr,
954 FILE *prompt, key_type_t key_type)
955 {
956 char path[PATH_MAX];
957 chunk_t filename;
958 chunk_t secret = chunk_empty;
959 private_key_t *key;
960
961 err_t ugh = extract_value(&filename, &line);
962
963 if (ugh != NULL)
964 {
965 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
966 return FALSE;
967 }
968 if (filename.len == 0)
969 {
970 DBG1(DBG_CFG, "line %d: empty filename", line_nr);
971 return FALSE;
972 }
973 if (*filename.ptr == '/')
974 {
975 /* absolute path name */
976 snprintf(path, sizeof(path), "%.*s", filename.len, filename.ptr);
977 }
978 else
979 {
980 /* relative path name */
981 snprintf(path, sizeof(path), "%s/%.*s", PRIVATE_KEY_DIR,
982 filename.len, filename.ptr);
983 }
984
985 /* check for optional passphrase */
986 if (eat_whitespace(&line))
987 {
988 ugh = extract_secret(&secret, &line);
989 if (ugh != NULL)
990 {
991 DBG1(DBG_CFG, "line %d: malformed passphrase: %s", line_nr, ugh);
992 return FALSE;
993 }
994 }
995 if (secret.len == 7 && strneq(secret.ptr, "%prompt", 7))
996 {
997 callback_cred_t *cb = NULL;
998 passphrase_cb_data_t pp_data = {
999 .prompt = prompt,
1000 .path = path,
1001 .try = 1,
1002 };
1003
1004 free(secret.ptr);
1005 if (!prompt)
1006 {
1007 return TRUE;
1008 }
1009 /* use callback credential set to prompt for the passphrase */
1010 pp_data.prompt = prompt;
1011 pp_data.path = path;
1012 pp_data.try = 1;
1013 cb = callback_cred_create_shared((void*)passphrase_cb, &pp_data);
1014 lib->credmgr->add_local_set(lib->credmgr, &cb->set);
1015
1016 /* unlock, as the builder might ask for a secret */
1017 this->lock->unlock(this->lock);
1018 key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, key_type,
1019 BUILD_FROM_FILE, path, BUILD_END);
1020 this->lock->write_lock(this->lock);
1021
1022 lib->credmgr->remove_local_set(lib->credmgr, &cb->set);
1023 cb->destroy(cb);
1024 }
1025 else
1026 {
1027 mem_cred_t *mem = NULL;
1028 shared_key_t *shared;
1029
1030 /* provide our pin in a temporary credential set */
1031 shared = shared_key_create(SHARED_PRIVATE_KEY_PASS, secret);
1032 mem = mem_cred_create();
1033 mem->add_shared(mem, shared, NULL);
1034 lib->credmgr->add_local_set(lib->credmgr, &mem->set);
1035
1036 /* unlock, as the builder might ask for a secret */
1037 this->lock->unlock(this->lock);
1038 key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, key_type,
1039 BUILD_FROM_FILE, path, BUILD_END);
1040 this->lock->write_lock(this->lock);
1041
1042 lib->credmgr->remove_local_set(lib->credmgr, &mem->set);
1043 mem->destroy(mem);
1044 }
1045 if (key)
1046 {
1047 DBG1(DBG_CFG, " loaded %N private key from '%s'",
1048 key_type_names, key->get_type(key), path);
1049 this->private->insert_last(this->private, key);
1050 }
1051 else
1052 {
1053 DBG1(DBG_CFG, " loading private key from '%s' failed", path);
1054 }
1055 return TRUE;
1056 }
1057
1058 /**
1059 * Load a shared key
1060 */
1061 static bool load_shared(private_stroke_cred_t *this, chunk_t line, int line_nr,
1062 shared_key_type_t type, chunk_t ids)
1063 {
1064 stroke_shared_key_t *shared_key;
1065 chunk_t secret = chunk_empty;
1066 bool any = TRUE;
1067
1068 err_t ugh = extract_secret(&secret, &line);
1069 if (ugh != NULL)
1070 {
1071 DBG1(DBG_CFG, "line %d: malformed secret: %s", line_nr, ugh);
1072 return FALSE;
1073 }
1074 shared_key = stroke_shared_key_create(type, secret);
1075 DBG1(DBG_CFG, " loaded %N secret for %s", shared_key_type_names, type,
1076 ids.len > 0 ? (char*)ids.ptr : "%any");
1077 DBG4(DBG_CFG, " secret: %#B", &secret);
1078
1079 this->shared->insert_last(this->shared, shared_key);
1080 while (ids.len > 0)
1081 {
1082 chunk_t id;
1083 identification_t *peer_id;
1084
1085 ugh = extract_value(&id, &ids);
1086 if (ugh != NULL)
1087 {
1088 DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
1089 return FALSE;
1090 }
1091 if (id.len == 0)
1092 {
1093 continue;
1094 }
1095
1096 /* NULL terminate the ID string */
1097 *(id.ptr + id.len) = '\0';
1098 peer_id = identification_create_from_string(id.ptr);
1099 if (peer_id->get_type(peer_id) == ID_ANY)
1100 {
1101 peer_id->destroy(peer_id);
1102 continue;
1103 }
1104
1105 shared_key->add_owner(shared_key, peer_id);
1106 any = FALSE;
1107 }
1108 if (any)
1109 {
1110 shared_key->add_owner(shared_key,
1111 identification_create_from_encoding(ID_ANY, chunk_empty));
1112 }
1113 return TRUE;
1114 }
1115
1116 /**
1117 * reload ipsec.secrets
1118 */
1119 static void load_secrets(private_stroke_cred_t *this, char *file, int level,
1120 FILE *prompt)
1121 {
1122 int line_nr = 0, fd;
1123 chunk_t src, line;
1124 private_key_t *private;
1125 shared_key_t *shared;
1126 struct stat sb;
1127 void *addr;
1128
1129 DBG1(DBG_CFG, "loading secrets from '%s'", file);
1130 fd = open(file, O_RDONLY);
1131 if (fd == -1)
1132 {
1133 DBG1(DBG_CFG, "opening secrets file '%s' failed: %s", file,
1134 strerror(errno));
1135 return;
1136 }
1137 if (fstat(fd, &sb) == -1)
1138 {
1139 DBG1(DBG_LIB, "getting file size of '%s' failed: %s", file,
1140 strerror(errno));
1141 close(fd);
1142 return;
1143 }
1144 addr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
1145 if (addr == MAP_FAILED)
1146 {
1147 DBG1(DBG_LIB, "mapping '%s' failed: %s", file, strerror(errno));
1148 close(fd);
1149 return;
1150 }
1151 src = chunk_create(addr, sb.st_size);
1152
1153 if (level == 0)
1154 {
1155 this->lock->write_lock(this->lock);
1156
1157 /* flush secrets on non-recursive invocation */
1158 while (this->shared->remove_last(this->shared,
1159 (void**)&shared) == SUCCESS)
1160 {
1161 shared->destroy(shared);
1162 }
1163 while (this->private->remove_last(this->private,
1164 (void**)&private) == SUCCESS)
1165 {
1166 private->destroy(private);
1167 }
1168 }
1169
1170 while (fetchline(&src, &line))
1171 {
1172 chunk_t ids, token;
1173 shared_key_type_t type;
1174
1175 line_nr++;
1176
1177 if (!eat_whitespace(&line))
1178 {
1179 continue;
1180 }
1181 if (line.len > strlen("include ") &&
1182 strneq(line.ptr, "include ", strlen("include ")))
1183 {
1184 glob_t buf;
1185 char **expanded, *dir, pattern[PATH_MAX];
1186 u_char *pos;
1187
1188 if (level > MAX_SECRETS_RECURSION)
1189 {
1190 DBG1(DBG_CFG, "maximum level of %d includes reached, ignored",
1191 MAX_SECRETS_RECURSION);
1192 continue;
1193 }
1194 /* terminate filename by space */
1195 line = chunk_skip(line, strlen("include "));
1196 pos = memchr(line.ptr, ' ', line.len);
1197 if (pos)
1198 {
1199 line.len = pos - line.ptr;
1200 }
1201 if (line.len && line.ptr[0] == '/')
1202 {
1203 if (line.len + 1 > sizeof(pattern))
1204 {
1205 DBG1(DBG_CFG, "include pattern too long, ignored");
1206 continue;
1207 }
1208 snprintf(pattern, sizeof(pattern), "%.*s", line.len, line.ptr);
1209 }
1210 else
1211 { /* use directory of current file if relative */
1212 dir = strdup(file);
1213 dir = dirname(dir);
1214
1215 if (line.len + 1 + strlen(dir) + 1 > sizeof(pattern))
1216 {
1217 DBG1(DBG_CFG, "include pattern too long, ignored");
1218 free(dir);
1219 continue;
1220 }
1221 snprintf(pattern, sizeof(pattern), "%s/%.*s",
1222 dir, line.len, line.ptr);
1223 free(dir);
1224 }
1225 if (glob(pattern, GLOB_ERR, NULL, &buf) != 0)
1226 {
1227 DBG1(DBG_CFG, "expanding file expression '%s' failed", pattern);
1228 globfree(&buf);
1229 }
1230 else
1231 {
1232 for (expanded = buf.gl_pathv; *expanded != NULL; expanded++)
1233 {
1234 load_secrets(this, *expanded, level + 1, prompt);
1235 }
1236 }
1237 globfree(&buf);
1238 continue;
1239 }
1240
1241 if (line.len > 2 && strneq(": ", line.ptr, 2))
1242 {
1243 /* no ids, skip the ':' */
1244 ids = chunk_empty;
1245 line.ptr++;
1246 line.len--;
1247 }
1248 else if (extract_token_str(&ids, " : ", &line))
1249 {
1250 /* NULL terminate the extracted id string */
1251 *(ids.ptr + ids.len) = '\0';
1252 }
1253 else
1254 {
1255 DBG1(DBG_CFG, "line %d: missing ' : ' separator", line_nr);
1256 break;
1257 }
1258
1259 if (!eat_whitespace(&line) || !extract_token(&token, ' ', &line))
1260 {
1261 DBG1(DBG_CFG, "line %d: missing token", line_nr);
1262 break;
1263 }
1264 if (match("RSA", &token) || match("ECDSA", &token))
1265 {
1266 if (!load_private(this, line, line_nr, prompt,
1267 match("RSA", &token) ? KEY_RSA : KEY_ECDSA))
1268 {
1269 break;
1270 }
1271 }
1272 else if (match("PIN", &token))
1273 {
1274 if (!load_pin(this, line, line_nr, prompt))
1275 {
1276 break;
1277 }
1278 }
1279 else if ((match("PSK", &token) && (type = SHARED_IKE)) ||
1280 (match("EAP", &token) && (type = SHARED_EAP)) ||
1281 (match("NTLM", &token) && (type = SHARED_NT_HASH)) ||
1282 (match("XAUTH", &token) && (type = SHARED_EAP)))
1283 {
1284 if (!load_shared(this, line, line_nr, type, ids))
1285 {
1286 break;
1287 }
1288 }
1289 else
1290 {
1291 DBG1(DBG_CFG, "line %d: token must be either "
1292 "RSA, ECDSA, PSK, EAP, XAUTH or PIN", line_nr);
1293 break;
1294 }
1295 }
1296 if (level == 0)
1297 {
1298 this->lock->unlock(this->lock);
1299 }
1300 munmap(addr, sb.st_size);
1301 close(fd);
1302 }
1303
1304 /**
1305 * load all certificates from ipsec.d
1306 */
1307 static void load_certs(private_stroke_cred_t *this)
1308 {
1309 DBG1(DBG_CFG, "loading ca certificates from '%s'",
1310 CA_CERTIFICATE_DIR);
1311 load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
1312
1313 DBG1(DBG_CFG, "loading aa certificates from '%s'",
1314 AA_CERTIFICATE_DIR);
1315 load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
1316
1317 DBG1(DBG_CFG, "loading ocsp signer certificates from '%s'",
1318 OCSP_CERTIFICATE_DIR);
1319 load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509, X509_OCSP_SIGNER);
1320
1321 DBG1(DBG_CFG, "loading attribute certificates from '%s'",
1322 ATTR_CERTIFICATE_DIR);
1323 load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
1324
1325 DBG1(DBG_CFG, "loading crls from '%s'",
1326 CRL_DIR);
1327 load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
1328 }
1329
1330 /**
1331 * Implementation of stroke_cred_t.reread.
1332 */
1333 static void reread(private_stroke_cred_t *this, stroke_msg_t *msg, FILE *prompt)
1334 {
1335 if (msg->reread.flags & REREAD_SECRETS)
1336 {
1337 DBG1(DBG_CFG, "rereading secrets");
1338 load_secrets(this, SECRETS_FILE, 0, prompt);
1339 }
1340 if (msg->reread.flags & REREAD_CACERTS)
1341 {
1342 DBG1(DBG_CFG, "rereading ca certificates from '%s'",
1343 CA_CERTIFICATE_DIR);
1344 load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
1345 }
1346 if (msg->reread.flags & REREAD_OCSPCERTS)
1347 {
1348 DBG1(DBG_CFG, "rereading ocsp signer certificates from '%s'",
1349 OCSP_CERTIFICATE_DIR);
1350 load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509,
1351 X509_OCSP_SIGNER);
1352 }
1353 if (msg->reread.flags & REREAD_AACERTS)
1354 {
1355 DBG1(DBG_CFG, "rereading aa certificates from '%s'",
1356 AA_CERTIFICATE_DIR);
1357 load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
1358 }
1359 if (msg->reread.flags & REREAD_ACERTS)
1360 {
1361 DBG1(DBG_CFG, "rereading attribute certificates from '%s'",
1362 ATTR_CERTIFICATE_DIR);
1363 load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
1364 }
1365 if (msg->reread.flags & REREAD_CRLS)
1366 {
1367 DBG1(DBG_CFG, "rereading crls from '%s'",
1368 CRL_DIR);
1369 load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
1370 }
1371 }
1372
1373 /**
1374 * Implementation of stroke_cred_t.destroy
1375 */
1376 static void destroy(private_stroke_cred_t *this)
1377 {
1378 this->certs->destroy_offset(this->certs, offsetof(certificate_t, destroy));
1379 this->shared->destroy_offset(this->shared, offsetof(shared_key_t, destroy));
1380 this->private->destroy_offset(this->private, offsetof(private_key_t, destroy));
1381 this->lock->destroy(this->lock);
1382 free(this);
1383 }
1384
1385 /*
1386 * see header file
1387 */
1388 stroke_cred_t *stroke_cred_create()
1389 {
1390 private_stroke_cred_t *this = malloc_thing(private_stroke_cred_t);
1391
1392 this->public.set.create_private_enumerator = (void*)create_private_enumerator;
1393 this->public.set.create_cert_enumerator = (void*)create_cert_enumerator;
1394 this->public.set.create_shared_enumerator = (void*)create_shared_enumerator;
1395 this->public.set.create_cdp_enumerator = (void*)return_null;
1396 this->public.set.cache_cert = (void*)cache_cert;
1397 this->public.reread = (void(*)(stroke_cred_t*, stroke_msg_t *msg, FILE*))reread;
1398 this->public.load_ca = (certificate_t*(*)(stroke_cred_t*, char *filename))load_ca;
1399 this->public.load_peer = (certificate_t*(*)(stroke_cred_t*, char *filename))load_peer;
1400 this->public.cachecrl = (void(*)(stroke_cred_t*, bool enabled))cachecrl;
1401 this->public.destroy = (void(*)(stroke_cred_t*))destroy;
1402
1403 this->certs = linked_list_create();
1404 this->shared = linked_list_create();
1405 this->private = linked_list_create();
1406 this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
1407
1408 load_certs(this);
1409 load_secrets(this, SECRETS_FILE, 0, NULL);
1410
1411 this->cachecrl = FALSE;
1412
1413 return &this->public;
1414 }
1415