Line data Source code
1 : /* certcache.c - Certificate caching
2 : * Copyright (C) 2004, 2005, 2007, 2008 g10 Code GmbH
3 : *
4 : * This file is part of DirMngr.
5 : *
6 : * DirMngr is free software; you can redistribute it and/or modify
7 : * it under the terms of the GNU General Public License as published by
8 : * the Free Software Foundation; either version 2 of the License, or
9 : * (at your option) any later version.
10 : *
11 : * DirMngr is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU General Public License
17 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include <config.h>
21 :
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <errno.h>
25 : #include <assert.h>
26 : #include <sys/types.h>
27 : #include <dirent.h>
28 : #include <npth.h>
29 :
30 : #include "dirmngr.h"
31 : #include "misc.h"
32 : #include "crlfetch.h"
33 : #include "certcache.h"
34 :
35 :
36 : #define MAX_EXTRA_CACHED_CERTS 1000
37 :
38 : /* Constants used to classify search patterns. */
39 : enum pattern_class
40 : {
41 : PATTERN_UNKNOWN = 0,
42 : PATTERN_EMAIL,
43 : PATTERN_EMAIL_SUBSTR,
44 : PATTERN_FINGERPRINT16,
45 : PATTERN_FINGERPRINT20,
46 : PATTERN_SHORT_KEYID,
47 : PATTERN_LONG_KEYID,
48 : PATTERN_SUBJECT,
49 : PATTERN_SERIALNO,
50 : PATTERN_SERIALNO_ISSUER,
51 : PATTERN_ISSUER,
52 : PATTERN_SUBSTR
53 : };
54 :
55 :
56 : /* A certificate cache item. This consists of a the KSBA cert object
57 : and some meta data for easier lookup. We use a hash table to keep
58 : track of all items and use the (randomly distributed) first byte of
59 : the fingerprint directly as the hash which makes it pretty easy. */
60 : struct cert_item_s
61 : {
62 : struct cert_item_s *next; /* Next item with the same hash value. */
63 : ksba_cert_t cert; /* The KSBA cert object or NULL is this is
64 : not a valid item. */
65 : unsigned char fpr[20]; /* The fingerprint of this object. */
66 : char *issuer_dn; /* The malloced issuer DN. */
67 : ksba_sexp_t sn; /* The malloced serial number */
68 : char *subject_dn; /* The malloced subject DN - maybe NULL. */
69 : struct
70 : {
71 : unsigned int loaded:1; /* It has been explicitly loaded. */
72 : unsigned int trusted:1; /* This is a trusted root certificate. */
73 : } flags;
74 : };
75 : typedef struct cert_item_s *cert_item_t;
76 :
77 : /* The actual cert cache consisting of 256 slots for items indexed by
78 : the first byte of the fingerprint. */
79 : static cert_item_t cert_cache[256];
80 :
81 : /* This is the global cache_lock variable. In general locking is not
82 : needed but it would take extra efforts to make sure that no
83 : indirect use of npth functions is done, so we simply lock it
84 : always. Note: We can't use static initialization, as that is not
85 : available through w32-pth. */
86 : static npth_rwlock_t cert_cache_lock;
87 :
88 : /* Flag to track whether the cache has been initialized. */
89 : static int initialization_done;
90 :
91 : /* Total number of certificates loaded during initialization and
92 : cached during operation. */
93 : static unsigned int total_loaded_certificates;
94 : static unsigned int total_extra_certificates;
95 :
96 :
97 :
98 : /* Helper to do the cache locking. */
99 : static void
100 0 : init_cache_lock (void)
101 : {
102 : int err;
103 :
104 0 : err = npth_rwlock_init (&cert_cache_lock, NULL);
105 0 : if (err)
106 0 : log_fatal (_("can't initialize certificate cache lock: %s\n"),
107 : strerror (err));
108 0 : }
109 :
110 : static void
111 0 : acquire_cache_read_lock (void)
112 : {
113 : int err;
114 :
115 0 : err = npth_rwlock_rdlock (&cert_cache_lock);
116 0 : if (err)
117 0 : log_fatal (_("can't acquire read lock on the certificate cache: %s\n"),
118 : strerror (err));
119 0 : }
120 :
121 : static void
122 0 : acquire_cache_write_lock (void)
123 : {
124 : int err;
125 :
126 0 : err = npth_rwlock_wrlock (&cert_cache_lock);
127 0 : if (err)
128 0 : log_fatal (_("can't acquire write lock on the certificate cache: %s\n"),
129 : strerror (err));
130 0 : }
131 :
132 : static void
133 0 : release_cache_lock (void)
134 : {
135 : int err;
136 :
137 0 : err = npth_rwlock_unlock (&cert_cache_lock);
138 0 : if (err)
139 0 : log_fatal (_("can't release lock on the certificate cache: %s\n"),
140 : strerror (err));
141 0 : }
142 :
143 :
144 : /* Return false if both serial numbers match. Can't be used for
145 : sorting. */
146 : static int
147 0 : compare_serialno (ksba_sexp_t serial1, ksba_sexp_t serial2 )
148 : {
149 0 : unsigned char *a = serial1;
150 0 : unsigned char *b = serial2;
151 0 : return cmp_simple_canon_sexp (a, b);
152 : }
153 :
154 :
155 :
156 : /* Return a malloced canonical S-Expression with the serial number
157 : converted from the hex string HEXSN. Return NULL on memory
158 : error. */
159 : ksba_sexp_t
160 0 : hexsn_to_sexp (const char *hexsn)
161 : {
162 : char *buffer, *p;
163 : size_t len;
164 : char numbuf[40];
165 :
166 0 : len = unhexify (NULL, hexsn);
167 0 : snprintf (numbuf, sizeof numbuf, "(%u:", (unsigned int)len);
168 0 : buffer = xtrymalloc (strlen (numbuf) + len + 2 );
169 0 : if (!buffer)
170 0 : return NULL;
171 0 : p = stpcpy (buffer, numbuf);
172 0 : len = unhexify (p, hexsn);
173 0 : p[len] = ')';
174 0 : p[len+1] = 0;
175 :
176 0 : return buffer;
177 : }
178 :
179 :
180 : /* Compute the fingerprint of the certificate CERT and put it into
181 : the 20 bytes large buffer DIGEST. Return address of this buffer. */
182 : unsigned char *
183 0 : cert_compute_fpr (ksba_cert_t cert, unsigned char *digest)
184 : {
185 : gpg_error_t err;
186 : gcry_md_hd_t md;
187 :
188 0 : err = gcry_md_open (&md, GCRY_MD_SHA1, 0);
189 0 : if (err)
190 0 : log_fatal ("gcry_md_open failed: %s\n", gpg_strerror (err));
191 :
192 0 : err = ksba_cert_hash (cert, 0, HASH_FNC, md);
193 0 : if (err)
194 : {
195 0 : log_error ("oops: ksba_cert_hash failed: %s\n", gpg_strerror (err));
196 0 : memset (digest, 0xff, 20); /* Use a dummy value. */
197 : }
198 : else
199 : {
200 0 : gcry_md_final (md);
201 0 : memcpy (digest, gcry_md_read (md, GCRY_MD_SHA1), 20);
202 : }
203 0 : gcry_md_close (md);
204 0 : return digest;
205 : }
206 :
207 :
208 : /* Cleanup one slot. This releases all resourses but keeps the actual
209 : slot in the cache marked for reuse. */
210 : static void
211 0 : clean_cache_slot (cert_item_t ci)
212 : {
213 : ksba_cert_t cert;
214 :
215 0 : if (!ci->cert)
216 0 : return; /* Already cleaned. */
217 :
218 0 : ksba_free (ci->sn);
219 0 : ci->sn = NULL;
220 0 : ksba_free (ci->issuer_dn);
221 0 : ci->issuer_dn = NULL;
222 0 : ksba_free (ci->subject_dn);
223 0 : ci->subject_dn = NULL;
224 0 : cert = ci->cert;
225 0 : ci->cert = NULL;
226 :
227 0 : ksba_cert_release (cert);
228 : }
229 :
230 :
231 : /* Put the certificate CERT into the cache. It is assumed that the
232 : cache is locked while this function is called. If FPR_BUFFER is not
233 : NULL the fingerprint of the certificate will be stored there.
234 : FPR_BUFFER neds to point to a buffer of at least 20 bytes. The
235 : fingerprint will be stored on success or when the function returns
236 : gpg_err_code(GPG_ERR_DUP_VALUE). */
237 : static gpg_error_t
238 0 : put_cert (ksba_cert_t cert, int is_loaded, int is_trusted, void *fpr_buffer)
239 : {
240 : unsigned char help_fpr_buffer[20], *fpr;
241 : cert_item_t ci;
242 :
243 0 : fpr = fpr_buffer? fpr_buffer : &help_fpr_buffer;
244 :
245 : /* If we already reached the caching limit, drop a couple of certs
246 : from the cache. Our dropping strategy is simple: We keep a
247 : static index counter and use this to start looking for
248 : certificates, then we drop 5 percent of the oldest certificates
249 : starting at that index. For a large cache this is a fair way of
250 : removing items. An LRU strategy would be better of course.
251 : Because we append new entries to the head of the list and we want
252 : to remove old ones first, we need to do this from the tail. The
253 : implementation is not very efficient but compared to the long
254 : time it takes to retrieve a certifciate from an external resource
255 : it seems to be reasonable. */
256 0 : if (!is_loaded && total_extra_certificates >= MAX_EXTRA_CACHED_CERTS)
257 : {
258 : static int idx;
259 : cert_item_t ci_mark;
260 : int i;
261 : unsigned int drop_count;
262 :
263 0 : drop_count = MAX_EXTRA_CACHED_CERTS / 20;
264 0 : if (drop_count < 2)
265 0 : drop_count = 2;
266 :
267 0 : log_info (_("dropping %u certificates from the cache\n"), drop_count);
268 0 : assert (idx < 256);
269 0 : for (i=idx; drop_count; i = ((i+1)%256))
270 : {
271 0 : ci_mark = NULL;
272 0 : for (ci = cert_cache[i]; ci; ci = ci->next)
273 0 : if (ci->cert && !ci->flags.loaded)
274 0 : ci_mark = ci;
275 0 : if (ci_mark)
276 : {
277 0 : clean_cache_slot (ci_mark);
278 0 : drop_count--;
279 0 : total_extra_certificates--;
280 : }
281 : }
282 0 : if (i==idx)
283 0 : idx++;
284 : else
285 0 : idx = i;
286 0 : idx %= 256;
287 : }
288 :
289 0 : cert_compute_fpr (cert, fpr);
290 0 : for (ci=cert_cache[*fpr]; ci; ci = ci->next)
291 0 : if (ci->cert && !memcmp (ci->fpr, fpr, 20))
292 0 : return gpg_error (GPG_ERR_DUP_VALUE);
293 : /* Try to reuse an existing entry. */
294 0 : for (ci=cert_cache[*fpr]; ci; ci = ci->next)
295 0 : if (!ci->cert)
296 0 : break;
297 0 : if (!ci)
298 : { /* No: Create a new entry. */
299 0 : ci = xtrycalloc (1, sizeof *ci);
300 0 : if (!ci)
301 0 : return gpg_error_from_errno (errno);
302 0 : ci->next = cert_cache[*fpr];
303 0 : cert_cache[*fpr] = ci;
304 : }
305 : else
306 0 : memset (&ci->flags, 0, sizeof ci->flags);
307 :
308 0 : ksba_cert_ref (cert);
309 0 : ci->cert = cert;
310 0 : memcpy (ci->fpr, fpr, 20);
311 0 : ci->sn = ksba_cert_get_serial (cert);
312 0 : ci->issuer_dn = ksba_cert_get_issuer (cert, 0);
313 0 : if (!ci->issuer_dn || !ci->sn)
314 : {
315 0 : clean_cache_slot (ci);
316 0 : return gpg_error (GPG_ERR_INV_CERT_OBJ);
317 : }
318 0 : ci->subject_dn = ksba_cert_get_subject (cert, 0);
319 0 : ci->flags.loaded = !!is_loaded;
320 0 : ci->flags.trusted = !!is_trusted;
321 :
322 0 : if (is_loaded)
323 0 : total_loaded_certificates++;
324 : else
325 0 : total_extra_certificates++;
326 :
327 0 : return 0;
328 : }
329 :
330 :
331 : /* Load certificates from the directory DIRNAME. All certificates
332 : matching the pattern "*.crt" or "*.der" are loaded. We assume that
333 : certificates are DER encoded and not PEM encapsulated. The cache
334 : should be in a locked state when calling this function. */
335 : static gpg_error_t
336 0 : load_certs_from_dir (const char *dirname, int are_trusted)
337 : {
338 : gpg_error_t err;
339 : DIR *dir;
340 : struct dirent *ep;
341 : char *p;
342 : size_t n;
343 : estream_t fp;
344 : ksba_reader_t reader;
345 : ksba_cert_t cert;
346 0 : char *fname = NULL;
347 :
348 0 : dir = opendir (dirname);
349 0 : if (!dir)
350 : {
351 0 : return 0; /* We do not consider this a severe error. */
352 : }
353 :
354 0 : while ( (ep=readdir (dir)) )
355 : {
356 0 : p = ep->d_name;
357 0 : if (*p == '.' || !*p)
358 0 : continue; /* Skip any hidden files and invalid entries. */
359 0 : n = strlen (p);
360 0 : if ( n < 5 || (strcmp (p+n-4,".crt") && strcmp (p+n-4,".der")))
361 0 : continue; /* Not the desired "*.crt" or "*.der" pattern. */
362 :
363 0 : xfree (fname);
364 0 : fname = make_filename (dirname, p, NULL);
365 0 : fp = es_fopen (fname, "rb");
366 0 : if (!fp)
367 : {
368 0 : log_error (_("can't open '%s': %s\n"),
369 0 : fname, strerror (errno));
370 0 : continue;
371 : }
372 :
373 0 : err = create_estream_ksba_reader (&reader, fp);
374 0 : if (err)
375 : {
376 0 : es_fclose (fp);
377 0 : continue;
378 : }
379 :
380 0 : err = ksba_cert_new (&cert);
381 0 : if (!err)
382 0 : err = ksba_cert_read_der (cert, reader);
383 0 : ksba_reader_release (reader);
384 0 : es_fclose (fp);
385 0 : if (err)
386 : {
387 0 : log_error (_("can't parse certificate '%s': %s\n"),
388 : fname, gpg_strerror (err));
389 0 : ksba_cert_release (cert);
390 0 : continue;
391 : }
392 :
393 0 : err = put_cert (cert, 1, are_trusted, NULL);
394 0 : if (gpg_err_code (err) == GPG_ERR_DUP_VALUE)
395 0 : log_info (_("certificate '%s' already cached\n"), fname);
396 0 : else if (!err)
397 : {
398 0 : if (are_trusted)
399 0 : log_info (_("trusted certificate '%s' loaded\n"), fname);
400 : else
401 0 : log_info (_("certificate '%s' loaded\n"), fname);
402 0 : if (opt.verbose)
403 : {
404 0 : p = get_fingerprint_hexstring_colon (cert);
405 0 : log_info (_(" SHA1 fingerprint = %s\n"), p);
406 0 : xfree (p);
407 :
408 0 : cert_log_name (_(" issuer ="), cert);
409 0 : cert_log_subject (_(" subject ="), cert);
410 : }
411 : }
412 : else
413 0 : log_error (_("error loading certificate '%s': %s\n"),
414 : fname, gpg_strerror (err));
415 0 : ksba_cert_release (cert);
416 : }
417 :
418 0 : xfree (fname);
419 0 : closedir (dir);
420 0 : return 0;
421 : }
422 :
423 :
424 : /* Initialize the certificate cache if not yet done. */
425 : void
426 0 : cert_cache_init (void)
427 : {
428 : char *dname;
429 :
430 0 : if (initialization_done)
431 0 : return;
432 0 : init_cache_lock ();
433 0 : acquire_cache_write_lock ();
434 :
435 0 : dname = make_filename (gnupg_sysconfdir (), "trusted-certs", NULL);
436 0 : load_certs_from_dir (dname, 1);
437 0 : xfree (dname);
438 :
439 0 : dname = make_filename (gnupg_sysconfdir (), "extra-certs", NULL);
440 0 : load_certs_from_dir (dname, 0);
441 0 : xfree (dname);
442 :
443 0 : initialization_done = 1;
444 0 : release_cache_lock ();
445 :
446 0 : cert_cache_print_stats ();
447 : }
448 :
449 : /* Deinitialize the certificate cache. With FULL set to true even the
450 : unused certificate slots are released. */
451 : void
452 0 : cert_cache_deinit (int full)
453 : {
454 : cert_item_t ci, ci2;
455 : int i;
456 :
457 0 : if (!initialization_done)
458 0 : return;
459 :
460 0 : acquire_cache_write_lock ();
461 :
462 0 : for (i=0; i < 256; i++)
463 0 : for (ci=cert_cache[i]; ci; ci = ci->next)
464 0 : clean_cache_slot (ci);
465 :
466 0 : if (full)
467 : {
468 0 : for (i=0; i < 256; i++)
469 : {
470 0 : for (ci=cert_cache[i]; ci; ci = ci2)
471 : {
472 0 : ci2 = ci->next;
473 0 : xfree (ci);
474 : }
475 0 : cert_cache[i] = NULL;
476 : }
477 : }
478 :
479 0 : total_loaded_certificates = 0;
480 0 : total_extra_certificates = 0;
481 0 : initialization_done = 0;
482 0 : release_cache_lock ();
483 : }
484 :
485 : /* Print some statistics to the log file. */
486 : void
487 0 : cert_cache_print_stats (void)
488 : {
489 0 : log_info (_("permanently loaded certificates: %u\n"),
490 : total_loaded_certificates);
491 0 : log_info (_(" runtime cached certificates: %u\n"),
492 : total_extra_certificates);
493 0 : }
494 :
495 :
496 : /* Put CERT into the certificate cache. */
497 : gpg_error_t
498 0 : cache_cert (ksba_cert_t cert)
499 : {
500 : gpg_error_t err;
501 :
502 0 : acquire_cache_write_lock ();
503 0 : err = put_cert (cert, 0, 0, NULL);
504 0 : release_cache_lock ();
505 0 : if (gpg_err_code (err) == GPG_ERR_DUP_VALUE)
506 0 : log_info (_("certificate already cached\n"));
507 0 : else if (!err)
508 0 : log_info (_("certificate cached\n"));
509 : else
510 0 : log_error (_("error caching certificate: %s\n"), gpg_strerror (err));
511 0 : return err;
512 : }
513 :
514 :
515 : /* Put CERT into the certificate cache and store the fingerprint of
516 : the certificate into FPR_BUFFER. If the certificate is already in
517 : the cache do not print a warning; just store the
518 : fingerprint. FPR_BUFFER needs to be at least 20 bytes. */
519 : gpg_error_t
520 0 : cache_cert_silent (ksba_cert_t cert, void *fpr_buffer)
521 : {
522 : gpg_error_t err;
523 :
524 0 : acquire_cache_write_lock ();
525 0 : err = put_cert (cert, 0, 0, fpr_buffer);
526 0 : release_cache_lock ();
527 0 : if (gpg_err_code (err) == GPG_ERR_DUP_VALUE)
528 0 : err = 0;
529 0 : if (err)
530 0 : log_error (_("error caching certificate: %s\n"), gpg_strerror (err));
531 0 : return err;
532 : }
533 :
534 :
535 :
536 : /* Return a certificate object for the given fingerprint. FPR is
537 : expected to be a 20 byte binary SHA-1 fingerprint. If no matching
538 : certificate is available in the cache NULL is returned. The caller
539 : must release a returned certificate. Note that although we are
540 : using reference counting the caller should not just compare the
541 : pointers to check for identical certificates. */
542 : ksba_cert_t
543 0 : get_cert_byfpr (const unsigned char *fpr)
544 : {
545 : cert_item_t ci;
546 :
547 0 : acquire_cache_read_lock ();
548 0 : for (ci=cert_cache[*fpr]; ci; ci = ci->next)
549 0 : if (ci->cert && !memcmp (ci->fpr, fpr, 20))
550 : {
551 0 : ksba_cert_ref (ci->cert);
552 0 : release_cache_lock ();
553 0 : return ci->cert;
554 : }
555 :
556 0 : release_cache_lock ();
557 0 : return NULL;
558 : }
559 :
560 : /* Return a certificate object for the given fingerprint. STRING is
561 : expected to be a SHA-1 fingerprint in standard hex notation with or
562 : without colons. If no matching certificate is available in the
563 : cache NULL is returned. The caller must release a returned
564 : certificate. Note that although we are using reference counting
565 : the caller should not just compare the pointers to check for
566 : identical certificates. */
567 : ksba_cert_t
568 0 : get_cert_byhexfpr (const char *string)
569 : {
570 : unsigned char fpr[20];
571 : const char *s;
572 : int i;
573 :
574 0 : if (strchr (string, ':'))
575 : {
576 0 : for (s=string,i=0; i < 20 && hexdigitp (s) && hexdigitp(s+1);)
577 : {
578 0 : if (s[2] && s[2] != ':')
579 0 : break; /* Invalid string. */
580 0 : fpr[i++] = xtoi_2 (s);
581 0 : s += 2;
582 0 : if (i!= 20 && *s == ':')
583 0 : s++;
584 : }
585 : }
586 : else
587 : {
588 0 : for (s=string,i=0; i < 20 && hexdigitp (s) && hexdigitp(s+1); s+=2 )
589 0 : fpr[i++] = xtoi_2 (s);
590 : }
591 0 : if (i!=20 || *s)
592 : {
593 0 : log_error (_("invalid SHA1 fingerprint string '%s'\n"), string);
594 0 : return NULL;
595 : }
596 :
597 0 : return get_cert_byfpr (fpr);
598 : }
599 :
600 :
601 :
602 : /* Return the certificate matching ISSUER_DN and SERIALNO. */
603 : ksba_cert_t
604 0 : get_cert_bysn (const char *issuer_dn, ksba_sexp_t serialno)
605 : {
606 : /* Simple and inefficient implementation. fixme! */
607 : cert_item_t ci;
608 : int i;
609 :
610 0 : acquire_cache_read_lock ();
611 0 : for (i=0; i < 256; i++)
612 : {
613 0 : for (ci=cert_cache[i]; ci; ci = ci->next)
614 0 : if (ci->cert && !strcmp (ci->issuer_dn, issuer_dn)
615 0 : && !compare_serialno (ci->sn, serialno))
616 : {
617 0 : ksba_cert_ref (ci->cert);
618 0 : release_cache_lock ();
619 0 : return ci->cert;
620 : }
621 : }
622 :
623 0 : release_cache_lock ();
624 0 : return NULL;
625 : }
626 :
627 :
628 : /* Return the certificate matching ISSUER_DN. SEQ should initially be
629 : set to 0 and bumped up to get the next issuer with that DN. */
630 : ksba_cert_t
631 0 : get_cert_byissuer (const char *issuer_dn, unsigned int seq)
632 : {
633 : /* Simple and very inefficient implementation and API. fixme! */
634 : cert_item_t ci;
635 : int i;
636 :
637 0 : acquire_cache_read_lock ();
638 0 : for (i=0; i < 256; i++)
639 : {
640 0 : for (ci=cert_cache[i]; ci; ci = ci->next)
641 0 : if (ci->cert && !strcmp (ci->issuer_dn, issuer_dn))
642 0 : if (!seq--)
643 : {
644 0 : ksba_cert_ref (ci->cert);
645 0 : release_cache_lock ();
646 0 : return ci->cert;
647 : }
648 : }
649 :
650 0 : release_cache_lock ();
651 0 : return NULL;
652 : }
653 :
654 :
655 : /* Return the certificate matching SUBJECT_DN. SEQ should initially be
656 : set to 0 and bumped up to get the next subject with that DN. */
657 : ksba_cert_t
658 0 : get_cert_bysubject (const char *subject_dn, unsigned int seq)
659 : {
660 : /* Simple and very inefficient implementation and API. fixme! */
661 : cert_item_t ci;
662 : int i;
663 :
664 0 : if (!subject_dn)
665 0 : return NULL;
666 :
667 0 : acquire_cache_read_lock ();
668 0 : for (i=0; i < 256; i++)
669 : {
670 0 : for (ci=cert_cache[i]; ci; ci = ci->next)
671 0 : if (ci->cert && ci->subject_dn
672 0 : && !strcmp (ci->subject_dn, subject_dn))
673 0 : if (!seq--)
674 : {
675 0 : ksba_cert_ref (ci->cert);
676 0 : release_cache_lock ();
677 0 : return ci->cert;
678 : }
679 : }
680 :
681 0 : release_cache_lock ();
682 0 : return NULL;
683 : }
684 :
685 :
686 :
687 : /* Return a value describing the the class of PATTERN. The offset of
688 : the actual string to be used for the comparison is stored at
689 : R_OFFSET. The offset of the serialnumer is stored at R_SN_OFFSET. */
690 : static enum pattern_class
691 0 : classify_pattern (const char *pattern, size_t *r_offset, size_t *r_sn_offset)
692 : {
693 : enum pattern_class result;
694 : const char *s;
695 0 : int hexprefix = 0;
696 : int hexlength;
697 :
698 0 : *r_offset = *r_sn_offset = 0;
699 :
700 : /* Skip leading spaces. */
701 0 : for(s = pattern; *s && spacep (s); s++ )
702 : ;
703 :
704 0 : switch (*s)
705 : {
706 : case 0: /* Empty string is an error. */
707 0 : result = PATTERN_UNKNOWN;
708 0 : break;
709 :
710 : case '.': /* An email address, compare from end. */
711 0 : result = PATTERN_UNKNOWN; /* Not implemented. */
712 0 : break;
713 :
714 : case '<': /* An email address. */
715 0 : result = PATTERN_EMAIL;
716 0 : s++;
717 0 : break;
718 :
719 : case '@': /* Part of an email address. */
720 0 : result = PATTERN_EMAIL_SUBSTR;
721 0 : s++;
722 0 : break;
723 :
724 : case '=': /* Exact compare. */
725 0 : result = PATTERN_UNKNOWN; /* Does not make sense for X.509. */
726 0 : break;
727 :
728 : case '*': /* Case insensitive substring search. */
729 0 : result = PATTERN_SUBSTR;
730 0 : s++;
731 0 : break;
732 :
733 : case '+': /* Compare individual words. */
734 0 : result = PATTERN_UNKNOWN; /* Not implemented. */
735 0 : break;
736 :
737 : case '/': /* Subject's DN. */
738 0 : s++;
739 0 : if (!*s || spacep (s))
740 0 : result = PATTERN_UNKNOWN; /* No DN or prefixed with a space. */
741 : else
742 0 : result = PATTERN_SUBJECT;
743 0 : break;
744 :
745 : case '#': /* Serial number or issuer DN. */
746 : {
747 : const char *si;
748 :
749 0 : s++;
750 0 : if ( *s == '/')
751 : {
752 : /* An issuer's DN is indicated by "#/" */
753 0 : s++;
754 0 : if (!*s || spacep (s))
755 0 : result = PATTERN_UNKNOWN; /* No DN or prefixed with a space. */
756 : else
757 0 : result = PATTERN_ISSUER;
758 : }
759 : else
760 : { /* Serialnumber + optional issuer ID. */
761 0 : for (si=s; *si && *si != '/'; si++)
762 0 : if (!strchr("01234567890abcdefABCDEF", *si))
763 0 : break;
764 0 : if (*si && *si != '/')
765 0 : result = PATTERN_UNKNOWN; /* Invalid digit in serial number. */
766 : else
767 : {
768 0 : *r_sn_offset = s - pattern;
769 0 : if (!*si)
770 0 : result = PATTERN_SERIALNO;
771 : else
772 : {
773 0 : s = si+1;
774 0 : if (!*s || spacep (s))
775 0 : result = PATTERN_UNKNOWN; /* No DN or prefixed
776 : with a space. */
777 : else
778 0 : result = PATTERN_SERIALNO_ISSUER;
779 : }
780 : }
781 : }
782 : }
783 0 : break;
784 :
785 : case ':': /* Unified fingerprint. */
786 : {
787 : const char *se, *si;
788 : int i;
789 :
790 0 : se = strchr (++s, ':');
791 0 : if (!se)
792 0 : result = PATTERN_UNKNOWN;
793 : else
794 : {
795 0 : for (i=0, si=s; si < se; si++, i++ )
796 0 : if (!strchr("01234567890abcdefABCDEF", *si))
797 0 : break;
798 0 : if ( si < se )
799 0 : result = PATTERN_UNKNOWN; /* Invalid digit. */
800 0 : else if (i == 32)
801 0 : result = PATTERN_FINGERPRINT16;
802 0 : else if (i == 40)
803 0 : result = PATTERN_FINGERPRINT20;
804 : else
805 0 : result = PATTERN_UNKNOWN; /* Invalid length for a fingerprint. */
806 : }
807 : }
808 0 : break;
809 :
810 : case '&': /* Keygrip. */
811 0 : result = PATTERN_UNKNOWN; /* Not implemented. */
812 0 : break;
813 :
814 : default:
815 0 : if (s[0] == '0' && s[1] == 'x')
816 : {
817 0 : hexprefix = 1;
818 0 : s += 2;
819 : }
820 :
821 0 : hexlength = strspn(s, "0123456789abcdefABCDEF");
822 :
823 : /* Check if a hexadecimal number is terminated by EOS or blank. */
824 0 : if (hexlength && s[hexlength] && !spacep (s+hexlength))
825 : {
826 : /* If the "0x" prefix is used a correct termination is required. */
827 0 : if (hexprefix)
828 : {
829 0 : result = PATTERN_UNKNOWN;
830 0 : break; /* switch */
831 : }
832 0 : hexlength = 0; /* Not a hex number. */
833 : }
834 :
835 0 : if (hexlength == 8 || (!hexprefix && hexlength == 9 && *s == '0'))
836 : {
837 0 : if (hexlength == 9)
838 0 : s++;
839 0 : result = PATTERN_SHORT_KEYID;
840 : }
841 0 : else if (hexlength == 16 || (!hexprefix && hexlength == 17 && *s == '0'))
842 : {
843 0 : if (hexlength == 17)
844 0 : s++;
845 0 : result = PATTERN_LONG_KEYID;
846 : }
847 0 : else if (hexlength == 32 || (!hexprefix && hexlength == 33 && *s == '0'))
848 : {
849 0 : if (hexlength == 33)
850 0 : s++;
851 0 : result = PATTERN_FINGERPRINT16;
852 : }
853 0 : else if (hexlength == 40 || (!hexprefix && hexlength == 41 && *s == '0'))
854 : {
855 0 : if (hexlength == 41)
856 0 : s++;
857 0 : result = PATTERN_FINGERPRINT20;
858 : }
859 0 : else if (!hexprefix)
860 : {
861 : /* The fingerprints used with X.509 are often delimited by
862 : colons, so we try to single this case out. */
863 0 : result = PATTERN_UNKNOWN;
864 0 : hexlength = strspn (s, ":0123456789abcdefABCDEF");
865 0 : if (hexlength == 59 && (!s[hexlength] || spacep (s+hexlength)))
866 : {
867 : int i, c;
868 :
869 0 : for (i=0; i < 20; i++, s += 3)
870 : {
871 0 : c = hextobyte(s);
872 0 : if (c == -1 || (i < 19 && s[2] != ':'))
873 : break;
874 : }
875 0 : if (i == 20)
876 0 : result = PATTERN_FINGERPRINT20;
877 : }
878 0 : if (result == PATTERN_UNKNOWN) /* Default to substring match. */
879 : {
880 0 : result = PATTERN_SUBSTR;
881 : }
882 : }
883 : else /* A hex number with a prefix but with a wrong length. */
884 0 : result = PATTERN_UNKNOWN;
885 : }
886 :
887 0 : if (result != PATTERN_UNKNOWN)
888 0 : *r_offset = s - pattern;
889 0 : return result;
890 : }
891 :
892 :
893 :
894 : /* Given PATTERN, which is a string as used by GnuPG to specify a
895 : certificate, return all matching certificates by calling the
896 : supplied function RETFNC. */
897 : gpg_error_t
898 0 : get_certs_bypattern (const char *pattern,
899 : gpg_error_t (*retfnc)(void*,ksba_cert_t),
900 : void *retfnc_data)
901 : {
902 0 : gpg_error_t err = GPG_ERR_BUG;
903 : enum pattern_class class;
904 : size_t offset, sn_offset;
905 : const char *hexserialno;
906 0 : ksba_sexp_t serialno = NULL;
907 0 : ksba_cert_t cert = NULL;
908 : unsigned int seq;
909 :
910 0 : if (!pattern || !retfnc)
911 0 : return gpg_error (GPG_ERR_INV_ARG);
912 :
913 0 : class = classify_pattern (pattern, &offset, &sn_offset);
914 0 : hexserialno = pattern + sn_offset;
915 0 : pattern += offset;
916 0 : switch (class)
917 : {
918 : case PATTERN_UNKNOWN:
919 0 : err = gpg_error (GPG_ERR_INV_NAME);
920 0 : break;
921 :
922 : case PATTERN_FINGERPRINT20:
923 0 : cert = get_cert_byhexfpr (pattern);
924 0 : err = cert? 0 : gpg_error (GPG_ERR_NOT_FOUND);
925 0 : break;
926 :
927 : case PATTERN_SERIALNO_ISSUER:
928 0 : serialno = hexsn_to_sexp (hexserialno);
929 0 : if (!serialno)
930 0 : err = gpg_error_from_syserror ();
931 : else
932 : {
933 0 : cert = get_cert_bysn (pattern, serialno);
934 0 : err = cert? 0 : gpg_error (GPG_ERR_NOT_FOUND);
935 : }
936 0 : break;
937 :
938 : case PATTERN_ISSUER:
939 0 : for (seq=0,err=0; !err && (cert = get_cert_byissuer (pattern, seq)); seq++)
940 : {
941 0 : err = retfnc (retfnc_data, cert);
942 0 : ksba_cert_release (cert);
943 0 : cert = NULL;
944 : }
945 0 : if (!err && !seq)
946 0 : err = gpg_error (GPG_ERR_NOT_FOUND);
947 0 : break;
948 :
949 : case PATTERN_SUBJECT:
950 0 : for (seq=0,err=0; !err && (cert = get_cert_bysubject (pattern, seq));seq++)
951 : {
952 0 : err = retfnc (retfnc_data, cert);
953 0 : ksba_cert_release (cert);
954 0 : cert = NULL;
955 : }
956 0 : if (!err && !seq)
957 0 : err = gpg_error (GPG_ERR_NOT_FOUND);
958 0 : break;
959 :
960 : case PATTERN_EMAIL:
961 : case PATTERN_EMAIL_SUBSTR:
962 : case PATTERN_FINGERPRINT16:
963 : case PATTERN_SHORT_KEYID:
964 : case PATTERN_LONG_KEYID:
965 : case PATTERN_SUBSTR:
966 : case PATTERN_SERIALNO:
967 : /* Not supported. */
968 0 : err = gpg_error (GPG_ERR_INV_NAME);
969 : }
970 :
971 :
972 0 : if (!err && cert)
973 0 : err = retfnc (retfnc_data, cert);
974 0 : ksba_cert_release (cert);
975 0 : xfree (serialno);
976 0 : return err;
977 : }
978 :
979 :
980 :
981 :
982 :
983 : /* Return the certificate matching ISSUER_DN and SERIALNO; if it is
984 : not already in the cache, try to find it from other resources. */
985 : ksba_cert_t
986 0 : find_cert_bysn (ctrl_t ctrl, const char *issuer_dn, ksba_sexp_t serialno)
987 : {
988 : gpg_error_t err;
989 : ksba_cert_t cert;
990 0 : cert_fetch_context_t context = NULL;
991 : char *hexsn, *buf;
992 :
993 : /* First check whether it has already been cached. */
994 0 : cert = get_cert_bysn (issuer_dn, serialno);
995 0 : if (cert)
996 0 : return cert;
997 :
998 : /* Ask back to the service requester to return the certificate.
999 : This is because we can assume that he already used the
1000 : certificate while checking for the CRL. */
1001 0 : hexsn = serial_hex (serialno);
1002 0 : if (!hexsn)
1003 : {
1004 0 : log_error ("serial_hex() failed\n");
1005 0 : return NULL;
1006 : }
1007 0 : buf = xtrymalloc (1 + strlen (hexsn) + 1 + strlen (issuer_dn) + 1);
1008 0 : if (!buf)
1009 : {
1010 0 : log_error ("can't allocate enough memory: %s\n", strerror (errno));
1011 0 : xfree (hexsn);
1012 0 : return NULL;
1013 : }
1014 0 : strcpy (stpcpy (stpcpy (stpcpy (buf, "#"), hexsn),"/"), issuer_dn);
1015 0 : xfree (hexsn);
1016 0 : cert = get_cert_local (ctrl, buf);
1017 0 : xfree (buf);
1018 0 : if (cert)
1019 : {
1020 0 : cache_cert (cert);
1021 0 : return cert; /* Done. */
1022 : }
1023 :
1024 0 : if (DBG_LOOKUP)
1025 0 : log_debug ("find_cert_bysn: certificate not returned by caller"
1026 : " - doing lookup\n");
1027 :
1028 : /* Retrieve the certificate from external resources. */
1029 0 : while (!cert)
1030 : {
1031 : ksba_sexp_t sn;
1032 : char *issdn;
1033 :
1034 0 : if (!context)
1035 : {
1036 0 : err = ca_cert_fetch (ctrl, &context, issuer_dn);
1037 0 : if (err)
1038 : {
1039 0 : log_error (_("error fetching certificate by S/N: %s\n"),
1040 : gpg_strerror (err));
1041 0 : break;
1042 : }
1043 : }
1044 :
1045 0 : err = fetch_next_ksba_cert (context, &cert);
1046 0 : if (err)
1047 : {
1048 0 : log_error (_("error fetching certificate by S/N: %s\n"),
1049 : gpg_strerror (err) );
1050 0 : break;
1051 : }
1052 :
1053 0 : issdn = ksba_cert_get_issuer (cert, 0);
1054 0 : if (strcmp (issuer_dn, issdn))
1055 : {
1056 0 : log_debug ("find_cert_bysn: Ooops: issuer DN does not match\n");
1057 0 : ksba_cert_release (cert);
1058 0 : cert = NULL;
1059 0 : ksba_free (issdn);
1060 0 : break;
1061 : }
1062 :
1063 0 : sn = ksba_cert_get_serial (cert);
1064 :
1065 0 : if (DBG_LOOKUP)
1066 : {
1067 0 : log_debug (" considering certificate (#");
1068 0 : dump_serial (sn);
1069 0 : log_printf ("/");
1070 0 : dump_string (issdn);
1071 0 : log_printf (")\n");
1072 : }
1073 :
1074 0 : if (!compare_serialno (serialno, sn))
1075 : {
1076 0 : ksba_free (sn);
1077 0 : ksba_free (issdn);
1078 0 : cache_cert (cert);
1079 0 : if (DBG_LOOKUP)
1080 0 : log_debug (" found\n");
1081 0 : break; /* Ready. */
1082 : }
1083 :
1084 0 : ksba_free (sn);
1085 0 : ksba_free (issdn);
1086 0 : ksba_cert_release (cert);
1087 0 : cert = NULL;
1088 : }
1089 :
1090 0 : end_cert_fetch (context);
1091 0 : return cert;
1092 : }
1093 :
1094 :
1095 : /* Return the certificate matching SUBJECT_DN and (if not NULL)
1096 : KEYID. If it is not already in the cache, try to find it from other
1097 : resources. Note, that the external search does not work for user
1098 : certificates because the LDAP lookup is on the caCertificate
1099 : attribute. For our purposes this is just fine. */
1100 : ksba_cert_t
1101 0 : find_cert_bysubject (ctrl_t ctrl, const char *subject_dn, ksba_sexp_t keyid)
1102 : {
1103 : gpg_error_t err;
1104 : int seq;
1105 0 : ksba_cert_t cert = NULL;
1106 0 : cert_fetch_context_t context = NULL;
1107 : ksba_sexp_t subj;
1108 :
1109 : /* If we have certificates from an OCSP request we first try to use
1110 : them. This is because these certificates will really be the
1111 : required ones and thus even in the case that they can't be
1112 : uniquely located by the following code we can use them. This is
1113 : for example required by Telesec certificates where a keyId is
1114 : used but the issuer certificate comes without a subject keyId! */
1115 0 : if (ctrl->ocsp_certs && subject_dn)
1116 : {
1117 : cert_item_t ci;
1118 : cert_ref_t cr;
1119 : int i;
1120 :
1121 : /* For efficiency reasons we won't use get_cert_bysubject here. */
1122 0 : acquire_cache_read_lock ();
1123 0 : for (i=0; i < 256; i++)
1124 0 : for (ci=cert_cache[i]; ci; ci = ci->next)
1125 0 : if (ci->cert && ci->subject_dn
1126 0 : && !strcmp (ci->subject_dn, subject_dn))
1127 0 : for (cr=ctrl->ocsp_certs; cr; cr = cr->next)
1128 0 : if (!memcmp (ci->fpr, cr->fpr, 20))
1129 : {
1130 0 : ksba_cert_ref (ci->cert);
1131 0 : release_cache_lock ();
1132 0 : return ci->cert; /* We use this certificate. */
1133 : }
1134 0 : release_cache_lock ();
1135 0 : if (DBG_LOOKUP)
1136 0 : log_debug ("find_cert_bysubject: certificate not in ocsp_certs\n");
1137 : }
1138 :
1139 :
1140 : /* First we check whether the certificate is cached. */
1141 0 : for (seq=0; (cert = get_cert_bysubject (subject_dn, seq)); seq++)
1142 : {
1143 0 : if (!keyid)
1144 0 : break; /* No keyid requested, so return the first one found. */
1145 0 : if (!ksba_cert_get_subj_key_id (cert, NULL, &subj)
1146 0 : && !cmp_simple_canon_sexp (keyid, subj))
1147 : {
1148 0 : xfree (subj);
1149 0 : break; /* Found matching cert. */
1150 : }
1151 0 : xfree (subj);
1152 0 : ksba_cert_release (cert);
1153 : }
1154 0 : if (cert)
1155 0 : return cert; /* Done. */
1156 :
1157 0 : if (DBG_LOOKUP)
1158 0 : log_debug ("find_cert_bysubject: certificate not in cache\n");
1159 :
1160 : /* Ask back to the service requester to return the certificate.
1161 : This is because we can assume that he already used the
1162 : certificate while checking for the CRL. */
1163 0 : if (keyid)
1164 0 : cert = get_cert_local_ski (ctrl, subject_dn, keyid);
1165 : else
1166 : {
1167 : /* In contrast to get_cert_local_ski, get_cert_local uses any
1168 : passed pattern, so we need to make sure that an exact subject
1169 : search is done. */
1170 : char *buf;
1171 :
1172 0 : buf = xtrymalloc (1 + strlen (subject_dn) + 1);
1173 0 : if (!buf)
1174 : {
1175 0 : log_error ("can't allocate enough memory: %s\n", strerror (errno));
1176 0 : return NULL;
1177 : }
1178 0 : strcpy (stpcpy (buf, "/"), subject_dn);
1179 0 : cert = get_cert_local (ctrl, buf);
1180 0 : xfree (buf);
1181 : }
1182 0 : if (cert)
1183 : {
1184 0 : cache_cert (cert);
1185 0 : return cert; /* Done. */
1186 : }
1187 :
1188 0 : if (DBG_LOOKUP)
1189 0 : log_debug ("find_cert_bysubject: certificate not returned by caller"
1190 : " - doing lookup\n");
1191 :
1192 : /* Locate the certificate using external resources. */
1193 0 : while (!cert)
1194 : {
1195 : char *subjdn;
1196 :
1197 0 : if (!context)
1198 : {
1199 0 : err = ca_cert_fetch (ctrl, &context, subject_dn);
1200 0 : if (err)
1201 : {
1202 0 : log_error (_("error fetching certificate by subject: %s\n"),
1203 : gpg_strerror (err));
1204 0 : break;
1205 : }
1206 : }
1207 :
1208 0 : err = fetch_next_ksba_cert (context, &cert);
1209 0 : if (err)
1210 : {
1211 0 : log_error (_("error fetching certificate by subject: %s\n"),
1212 : gpg_strerror (err) );
1213 0 : break;
1214 : }
1215 :
1216 0 : subjdn = ksba_cert_get_subject (cert, 0);
1217 0 : if (strcmp (subject_dn, subjdn))
1218 : {
1219 0 : log_info ("find_cert_bysubject: subject DN does not match\n");
1220 0 : ksba_cert_release (cert);
1221 0 : cert = NULL;
1222 0 : ksba_free (subjdn);
1223 0 : continue;
1224 : }
1225 :
1226 :
1227 0 : if (DBG_LOOKUP)
1228 : {
1229 0 : log_debug (" considering certificate (/");
1230 0 : dump_string (subjdn);
1231 0 : log_printf (")\n");
1232 : }
1233 0 : ksba_free (subjdn);
1234 :
1235 : /* If no key ID has been provided, we return the first match. */
1236 0 : if (!keyid)
1237 : {
1238 0 : cache_cert (cert);
1239 0 : if (DBG_LOOKUP)
1240 0 : log_debug (" found\n");
1241 0 : break; /* Ready. */
1242 : }
1243 :
1244 : /* With the key ID given we need to compare it. */
1245 0 : if (!ksba_cert_get_subj_key_id (cert, NULL, &subj))
1246 : {
1247 0 : if (!cmp_simple_canon_sexp (keyid, subj))
1248 : {
1249 0 : ksba_free (subj);
1250 0 : cache_cert (cert);
1251 0 : if (DBG_LOOKUP)
1252 0 : log_debug (" found\n");
1253 0 : break; /* Ready. */
1254 : }
1255 : }
1256 :
1257 0 : ksba_free (subj);
1258 0 : ksba_cert_release (cert);
1259 0 : cert = NULL;
1260 : }
1261 :
1262 0 : end_cert_fetch (context);
1263 0 : return cert;
1264 : }
1265 :
1266 :
1267 :
1268 : /* Return 0 if the certificate is a trusted certificate. Returns
1269 : GPG_ERR_NOT_TRUSTED if it is not trusted or other error codes in
1270 : case of systems errors. */
1271 : gpg_error_t
1272 0 : is_trusted_cert (ksba_cert_t cert)
1273 : {
1274 : unsigned char fpr[20];
1275 : cert_item_t ci;
1276 :
1277 0 : cert_compute_fpr (cert, fpr);
1278 :
1279 0 : acquire_cache_read_lock ();
1280 0 : for (ci=cert_cache[*fpr]; ci; ci = ci->next)
1281 0 : if (ci->cert && !memcmp (ci->fpr, fpr, 20))
1282 : {
1283 0 : if (ci->flags.trusted)
1284 : {
1285 0 : release_cache_lock ();
1286 0 : return 0; /* Yes, it is trusted. */
1287 : }
1288 0 : break;
1289 : }
1290 :
1291 0 : release_cache_lock ();
1292 0 : return gpg_error (GPG_ERR_NOT_TRUSTED);
1293 : }
1294 :
1295 :
1296 :
1297 : /* Given the certificate CERT locate the issuer for this certificate
1298 : and return it at R_CERT. Returns 0 on success or
1299 : GPG_ERR_NOT_FOUND. */
1300 : gpg_error_t
1301 0 : find_issuing_cert (ctrl_t ctrl, ksba_cert_t cert, ksba_cert_t *r_cert)
1302 : {
1303 : gpg_error_t err;
1304 : char *issuer_dn;
1305 0 : ksba_cert_t issuer_cert = NULL;
1306 : ksba_name_t authid;
1307 : ksba_sexp_t authidno;
1308 : ksba_sexp_t keyid;
1309 :
1310 0 : *r_cert = NULL;
1311 :
1312 0 : issuer_dn = ksba_cert_get_issuer (cert, 0);
1313 0 : if (!issuer_dn)
1314 : {
1315 0 : log_error (_("no issuer found in certificate\n"));
1316 0 : err = gpg_error (GPG_ERR_BAD_CERT);
1317 0 : goto leave;
1318 : }
1319 :
1320 : /* First we need to check whether we can return that certificate
1321 : using the authorithyKeyIdentifier. */
1322 0 : err = ksba_cert_get_auth_key_id (cert, &keyid, &authid, &authidno);
1323 0 : if (err)
1324 : {
1325 0 : log_info (_("error getting authorityKeyIdentifier: %s\n"),
1326 : gpg_strerror (err));
1327 : }
1328 : else
1329 : {
1330 0 : const char *s = ksba_name_enum (authid, 0);
1331 0 : if (s && *authidno)
1332 : {
1333 0 : issuer_cert = find_cert_bysn (ctrl, s, authidno);
1334 : }
1335 0 : if (!issuer_cert && keyid)
1336 : {
1337 : /* Not found by issuer+s/n. Now that we have an AKI
1338 : keyIdentifier look for a certificate with a matching
1339 : SKI. */
1340 0 : issuer_cert = find_cert_bysubject (ctrl, issuer_dn, keyid);
1341 : }
1342 : /* Print a note so that the user does not feel too helpless when
1343 : an issuer certificate was found and gpgsm prints BAD
1344 : signature because it is not the correct one. */
1345 0 : if (!issuer_cert)
1346 : {
1347 0 : log_info ("issuer certificate ");
1348 0 : if (keyid)
1349 : {
1350 0 : log_printf ("{");
1351 0 : dump_serial (keyid);
1352 0 : log_printf ("} ");
1353 : }
1354 0 : if (authidno)
1355 : {
1356 0 : log_printf ("(#");
1357 0 : dump_serial (authidno);
1358 0 : log_printf ("/");
1359 0 : dump_string (s);
1360 0 : log_printf (") ");
1361 : }
1362 0 : log_printf ("not found using authorityKeyIdentifier\n");
1363 : }
1364 0 : ksba_name_release (authid);
1365 0 : xfree (authidno);
1366 0 : xfree (keyid);
1367 : }
1368 :
1369 : /* If this did not work, try just with the issuer's name and assume
1370 : that there is only one such certificate. We only look into our
1371 : cache then. */
1372 0 : if (err || !issuer_cert)
1373 : {
1374 0 : issuer_cert = get_cert_bysubject (issuer_dn, 0);
1375 0 : if (issuer_cert)
1376 0 : err = 0;
1377 : }
1378 :
1379 : leave:
1380 0 : if (!err && !issuer_cert)
1381 0 : err = gpg_error (GPG_ERR_NOT_FOUND);
1382 :
1383 0 : xfree (issuer_dn);
1384 :
1385 0 : if (err)
1386 0 : ksba_cert_release (issuer_cert);
1387 : else
1388 0 : *r_cert = issuer_cert;
1389 :
1390 0 : return err;
1391 : }
|
