Line data Source code
1 : /* sign.c - Sign a message
2 : * Copyright (C) 2001, 2002, 2003, 2008,
3 : * 2010 Free Software Foundation, Inc.
4 : *
5 : * This file is part of GnuPG.
6 : *
7 : * GnuPG is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU General Public License as published by
9 : * the Free Software Foundation; either version 3 of the License, or
10 : * (at your option) any later version.
11 : *
12 : * GnuPG is distributed in the hope that it will be useful,
13 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : * GNU General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU General Public License
18 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 : */
20 :
21 : #include <config.h>
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <string.h>
25 : #include <errno.h>
26 : #include <unistd.h>
27 : #include <time.h>
28 : #include <assert.h>
29 :
30 : #include "gpgsm.h"
31 : #include <gcrypt.h>
32 : #include <ksba.h>
33 :
34 : #include "keydb.h"
35 : #include "i18n.h"
36 :
37 :
38 : /* Hash the data and return if something was hashed. Return -1 on error. */
39 : static int
40 0 : hash_data (int fd, gcry_md_hd_t md)
41 : {
42 : estream_t fp;
43 : char buffer[4096];
44 : int nread;
45 0 : int rc = 0;
46 :
47 0 : fp = es_fdopen_nc (fd, "rb");
48 0 : if (!fp)
49 : {
50 0 : log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
51 0 : return -1;
52 : }
53 :
54 : do
55 : {
56 0 : nread = es_fread (buffer, 1, DIM(buffer), fp);
57 0 : gcry_md_write (md, buffer, nread);
58 : }
59 0 : while (nread);
60 0 : if (es_ferror (fp))
61 : {
62 0 : log_error ("read error on fd %d: %s\n", fd, strerror (errno));
63 0 : rc = -1;
64 : }
65 0 : es_fclose (fp);
66 0 : return rc;
67 : }
68 :
69 :
70 : static int
71 0 : hash_and_copy_data (int fd, gcry_md_hd_t md, ksba_writer_t writer)
72 : {
73 : gpg_error_t err;
74 : estream_t fp;
75 : char buffer[4096];
76 : int nread;
77 0 : int rc = 0;
78 0 : int any = 0;
79 :
80 0 : fp = es_fdopen_nc (fd, "rb");
81 0 : if (!fp)
82 : {
83 0 : gpg_error_t tmperr = gpg_error_from_syserror ();
84 0 : log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
85 0 : return tmperr;
86 : }
87 :
88 : do
89 : {
90 0 : nread = es_fread (buffer, 1, DIM(buffer), fp);
91 0 : if (nread)
92 : {
93 0 : any = 1;
94 0 : gcry_md_write (md, buffer, nread);
95 0 : err = ksba_writer_write_octet_string (writer, buffer, nread, 0);
96 0 : if (err)
97 : {
98 0 : log_error ("write failed: %s\n", gpg_strerror (err));
99 0 : rc = err;
100 : }
101 : }
102 : }
103 0 : while (nread && !rc);
104 0 : if (es_ferror (fp))
105 : {
106 0 : rc = gpg_error_from_syserror ();
107 0 : log_error ("read error on fd %d: %s\n", fd, strerror (errno));
108 : }
109 0 : es_fclose (fp);
110 0 : if (!any)
111 : {
112 : /* We can't allow signing an empty message because it does not
113 : make much sense and more seriously, ksba_cms_build has
114 : already written the tag for data and now expects an octet
115 : string and an octet string of size 0 is illegal. */
116 0 : log_error ("cannot sign an empty message\n");
117 0 : rc = gpg_error (GPG_ERR_NO_DATA);
118 : }
119 0 : if (!rc)
120 : {
121 0 : err = ksba_writer_write_octet_string (writer, NULL, 0, 1);
122 0 : if (err)
123 : {
124 0 : log_error ("write failed: %s\n", gpg_strerror (err));
125 0 : rc = err;
126 : }
127 : }
128 :
129 0 : return rc;
130 : }
131 :
132 :
133 : /* Get the default certificate which is defined as the first
134 : certificate capable of signing returned by the keyDB and has a
135 : secret key available. */
136 : int
137 0 : gpgsm_get_default_cert (ctrl_t ctrl, ksba_cert_t *r_cert)
138 : {
139 : KEYDB_HANDLE hd;
140 0 : ksba_cert_t cert = NULL;
141 : int rc;
142 : char *p;
143 :
144 0 : hd = keydb_new (0);
145 0 : if (!hd)
146 0 : return gpg_error (GPG_ERR_GENERAL);
147 0 : rc = keydb_search_first (hd);
148 0 : if (rc)
149 : {
150 0 : keydb_release (hd);
151 0 : return rc;
152 : }
153 :
154 : do
155 : {
156 0 : rc = keydb_get_cert (hd, &cert);
157 0 : if (rc)
158 : {
159 0 : log_error ("keydb_get_cert failed: %s\n", gpg_strerror (rc));
160 0 : keydb_release (hd);
161 0 : return rc;
162 : }
163 :
164 0 : if (!gpgsm_cert_use_sign_p (cert))
165 : {
166 0 : p = gpgsm_get_keygrip_hexstring (cert);
167 0 : if (p)
168 : {
169 0 : if (!gpgsm_agent_havekey (ctrl, p))
170 : {
171 0 : xfree (p);
172 0 : keydb_release (hd);
173 0 : *r_cert = cert;
174 0 : return 0; /* got it */
175 : }
176 0 : xfree (p);
177 : }
178 : }
179 :
180 0 : ksba_cert_release (cert);
181 0 : cert = NULL;
182 : }
183 0 : while (!(rc = keydb_search_next (hd)));
184 0 : if (rc && rc != -1)
185 0 : log_error ("keydb_search_next failed: %s\n", gpg_strerror (rc));
186 :
187 0 : ksba_cert_release (cert);
188 0 : keydb_release (hd);
189 0 : return rc;
190 : }
191 :
192 :
193 : static ksba_cert_t
194 0 : get_default_signer (ctrl_t ctrl)
195 : {
196 : KEYDB_SEARCH_DESC desc;
197 0 : ksba_cert_t cert = NULL;
198 0 : KEYDB_HANDLE kh = NULL;
199 : int rc;
200 :
201 0 : if (!opt.local_user)
202 : {
203 0 : rc = gpgsm_get_default_cert (ctrl, &cert);
204 0 : if (rc)
205 : {
206 0 : if (rc != -1)
207 0 : log_debug ("failed to find default certificate: %s\n",
208 : gpg_strerror (rc));
209 0 : return NULL;
210 : }
211 0 : return cert;
212 : }
213 :
214 0 : rc = classify_user_id (opt.local_user, &desc, 0);
215 0 : if (rc)
216 : {
217 0 : log_error ("failed to find default signer: %s\n", gpg_strerror (rc));
218 0 : return NULL;
219 : }
220 :
221 0 : kh = keydb_new (0);
222 0 : if (!kh)
223 0 : return NULL;
224 :
225 0 : rc = keydb_search (kh, &desc, 1);
226 0 : if (rc)
227 : {
228 0 : log_debug ("failed to find default certificate: rc=%d\n", rc);
229 : }
230 : else
231 : {
232 0 : rc = keydb_get_cert (kh, &cert);
233 0 : if (rc)
234 : {
235 0 : log_debug ("failed to get cert: rc=%d\n", rc);
236 : }
237 : }
238 :
239 0 : keydb_release (kh);
240 0 : return cert;
241 : }
242 :
243 : /* Depending on the options in CTRL add the certificate CERT as well as
244 : other certificate up in the chain to the Root-CA to the CMS
245 : object. */
246 : static int
247 0 : add_certificate_list (ctrl_t ctrl, ksba_cms_t cms, ksba_cert_t cert)
248 : {
249 : gpg_error_t err;
250 0 : int rc = 0;
251 0 : ksba_cert_t next = NULL;
252 : int n;
253 0 : int not_root = 0;
254 :
255 0 : ksba_cert_ref (cert);
256 :
257 0 : n = ctrl->include_certs;
258 0 : log_debug ("adding certificates at level %d\n", n);
259 0 : if (n == -2)
260 : {
261 0 : not_root = 1;
262 0 : n = -1;
263 : }
264 0 : if (n < 0 || n > 50)
265 0 : n = 50; /* We better apply an upper bound */
266 :
267 : /* First add my own certificate unless we don't want any certificate
268 : included at all. */
269 0 : if (n)
270 : {
271 0 : if (not_root && gpgsm_is_root_cert (cert))
272 0 : err = 0;
273 : else
274 0 : err = ksba_cms_add_cert (cms, cert);
275 0 : if (err)
276 0 : goto ksba_failure;
277 0 : if (n>0)
278 0 : n--;
279 : }
280 : /* Walk the chain to include all other certificates. Note that a -1
281 : used for N makes sure that there is no limit and all certs get
282 : included. */
283 0 : while ( n-- && !(rc = gpgsm_walk_cert_chain (ctrl, cert, &next)) )
284 : {
285 0 : if (not_root && gpgsm_is_root_cert (next))
286 0 : err = 0;
287 : else
288 0 : err = ksba_cms_add_cert (cms, next);
289 0 : ksba_cert_release (cert);
290 0 : cert = next; next = NULL;
291 0 : if (err)
292 0 : goto ksba_failure;
293 : }
294 0 : ksba_cert_release (cert);
295 :
296 0 : return rc == -1? 0: rc;
297 :
298 : ksba_failure:
299 0 : ksba_cert_release (cert);
300 0 : log_error ("ksba_cms_add_cert failed: %s\n", gpg_strerror (err));
301 0 : return err;
302 : }
303 :
304 :
305 :
306 :
307 : /* Perform a sign operation.
308 :
309 : Sign the data received on DATA-FD in embedded mode or in detached
310 : mode when DETACHED is true. Write the signature to OUT_FP. The
311 : keys used to sign are taken from SIGNERLIST or the default one will
312 : be used if the value of this argument is NULL. */
313 : int
314 0 : gpgsm_sign (ctrl_t ctrl, certlist_t signerlist,
315 : int data_fd, int detached, estream_t out_fp)
316 : {
317 : int i, rc;
318 : gpg_error_t err;
319 0 : Base64Context b64writer = NULL;
320 : ksba_writer_t writer;
321 0 : ksba_cms_t cms = NULL;
322 : ksba_stop_reason_t stopreason;
323 0 : KEYDB_HANDLE kh = NULL;
324 0 : gcry_md_hd_t data_md = NULL;
325 : int signer;
326 : const char *algoid;
327 : int algo;
328 : ksba_isotime_t signed_at;
329 : certlist_t cl;
330 0 : int release_signerlist = 0;
331 :
332 0 : audit_set_type (ctrl->audit, AUDIT_TYPE_SIGN);
333 :
334 0 : kh = keydb_new (0);
335 0 : if (!kh)
336 : {
337 0 : log_error (_("failed to allocate keyDB handle\n"));
338 0 : rc = gpg_error (GPG_ERR_GENERAL);
339 0 : goto leave;
340 : }
341 :
342 0 : ctrl->pem_name = "SIGNED MESSAGE";
343 0 : rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, &writer);
344 0 : if (rc)
345 : {
346 0 : log_error ("can't create writer: %s\n", gpg_strerror (rc));
347 0 : goto leave;
348 : }
349 :
350 0 : err = ksba_cms_new (&cms);
351 0 : if (err)
352 : {
353 0 : rc = err;
354 0 : goto leave;
355 : }
356 :
357 0 : err = ksba_cms_set_reader_writer (cms, NULL, writer);
358 0 : if (err)
359 : {
360 0 : log_debug ("ksba_cms_set_reader_writer failed: %s\n",
361 : gpg_strerror (err));
362 0 : rc = err;
363 0 : goto leave;
364 : }
365 :
366 : /* We are going to create signed data with data as encap. content */
367 0 : err = ksba_cms_set_content_type (cms, 0, KSBA_CT_SIGNED_DATA);
368 0 : if (!err)
369 0 : err = ksba_cms_set_content_type (cms, 1, KSBA_CT_DATA);
370 0 : if (err)
371 : {
372 0 : log_debug ("ksba_cms_set_content_type failed: %s\n",
373 : gpg_strerror (err));
374 0 : rc = err;
375 0 : goto leave;
376 : }
377 :
378 : /* If no list of signers is given, use the default certificate. */
379 0 : if (!signerlist)
380 : {
381 0 : ksba_cert_t cert = get_default_signer (ctrl);
382 0 : if (!cert)
383 : {
384 0 : log_error ("no default signer found\n");
385 0 : gpgsm_status2 (ctrl, STATUS_INV_SGNR,
386 : get_inv_recpsgnr_code (GPG_ERR_NO_SECKEY), NULL);
387 0 : rc = gpg_error (GPG_ERR_GENERAL);
388 0 : goto leave;
389 : }
390 :
391 : /* Although we don't check for ambigious specification we will
392 : check that the signer's certificate is usable and valid. */
393 0 : rc = gpgsm_cert_use_sign_p (cert);
394 0 : if (!rc)
395 0 : rc = gpgsm_validate_chain (ctrl, cert, "", NULL, 0, NULL, 0, NULL);
396 0 : if (rc)
397 : {
398 : char *tmpfpr;
399 :
400 0 : tmpfpr = gpgsm_get_fingerprint_hexstring (cert, 0);
401 0 : gpgsm_status2 (ctrl, STATUS_INV_SGNR,
402 : get_inv_recpsgnr_code (rc), tmpfpr, NULL);
403 0 : xfree (tmpfpr);
404 0 : goto leave;
405 : }
406 :
407 : /* That one is fine - create signerlist. */
408 0 : signerlist = xtrycalloc (1, sizeof *signerlist);
409 0 : if (!signerlist)
410 : {
411 0 : rc = out_of_core ();
412 0 : ksba_cert_release (cert);
413 0 : goto leave;
414 : }
415 0 : signerlist->cert = cert;
416 0 : release_signerlist = 1;
417 : }
418 :
419 : /* Figure out the hash algorithm to use. We do not want to use the
420 : one for the certificate but if possible an OID for the plain
421 : algorithm. */
422 0 : if (opt.forced_digest_algo && opt.verbose)
423 0 : log_info ("user requested hash algorithm %d\n", opt.forced_digest_algo);
424 0 : for (i=0, cl=signerlist; cl; cl = cl->next, i++)
425 : {
426 : const char *oid;
427 :
428 0 : if (opt.forced_digest_algo)
429 : {
430 0 : oid = NULL;
431 0 : cl->hash_algo = opt.forced_digest_algo;
432 : }
433 : else
434 : {
435 0 : oid = ksba_cert_get_digest_algo (cl->cert);
436 0 : cl->hash_algo = oid ? gcry_md_map_name (oid) : 0;
437 : }
438 0 : switch (cl->hash_algo)
439 : {
440 0 : case GCRY_MD_SHA1: oid = "1.3.14.3.2.26"; break;
441 0 : case GCRY_MD_RMD160: oid = "1.3.36.3.2.1"; break;
442 0 : case GCRY_MD_SHA224: oid = "2.16.840.1.101.3.4.2.4"; break;
443 0 : case GCRY_MD_SHA256: oid = "2.16.840.1.101.3.4.2.1"; break;
444 0 : case GCRY_MD_SHA384: oid = "2.16.840.1.101.3.4.2.2"; break;
445 0 : case GCRY_MD_SHA512: oid = "2.16.840.1.101.3.4.2.3"; break;
446 : /* case GCRY_MD_WHIRLPOOL: oid = "No OID yet"; break; */
447 :
448 : case GCRY_MD_MD5: /* We don't want to use MD5. */
449 : case 0: /* No algorithm found in cert. */
450 : default: /* Other algorithms. */
451 0 : log_info (_("hash algorithm %d (%s) for signer %d not supported;"
452 : " using %s\n"),
453 : cl->hash_algo, oid? oid: "?", i,
454 : gcry_md_algo_name (GCRY_MD_SHA1));
455 0 : cl->hash_algo = GCRY_MD_SHA1;
456 0 : oid = "1.3.14.3.2.26";
457 0 : break;
458 : }
459 0 : cl->hash_algo_oid = oid;
460 : }
461 :
462 0 : if (opt.verbose)
463 : {
464 0 : for (i=0, cl=signerlist; cl; cl = cl->next, i++)
465 0 : log_info (_("hash algorithm used for signer %d: %s (%s)\n"),
466 : i, gcry_md_algo_name (cl->hash_algo), cl->hash_algo_oid);
467 : }
468 :
469 :
470 : /* Gather certificates of signers and store them in the CMS object. */
471 0 : for (cl=signerlist; cl; cl = cl->next)
472 : {
473 0 : rc = gpgsm_cert_use_sign_p (cl->cert);
474 0 : if (rc)
475 0 : goto leave;
476 :
477 0 : err = ksba_cms_add_signer (cms, cl->cert);
478 0 : if (err)
479 : {
480 0 : log_error ("ksba_cms_add_signer failed: %s\n", gpg_strerror (err));
481 0 : rc = err;
482 0 : goto leave;
483 : }
484 0 : rc = add_certificate_list (ctrl, cms, cl->cert);
485 0 : if (rc)
486 : {
487 0 : log_error ("failed to store list of certificates: %s\n",
488 : gpg_strerror(rc));
489 0 : goto leave;
490 : }
491 : /* Set the hash algorithm we are going to use */
492 0 : err = ksba_cms_add_digest_algo (cms, cl->hash_algo_oid);
493 0 : if (err)
494 : {
495 0 : log_debug ("ksba_cms_add_digest_algo failed: %s\n",
496 : gpg_strerror (err));
497 0 : rc = err;
498 0 : goto leave;
499 : }
500 : }
501 :
502 :
503 : /* Check whether one of the certificates is qualified. Note that we
504 : already validated the certificate and thus the user data stored
505 : flag must be available. */
506 0 : if (!opt.no_chain_validation)
507 : {
508 0 : for (cl=signerlist; cl; cl = cl->next)
509 : {
510 : size_t buflen;
511 : char buffer[1];
512 :
513 0 : err = ksba_cert_get_user_data (cl->cert, "is_qualified",
514 : &buffer, sizeof (buffer), &buflen);
515 0 : if (err || !buflen)
516 : {
517 0 : log_error (_("checking for qualified certificate failed: %s\n"),
518 : gpg_strerror (err));
519 0 : rc = err;
520 0 : goto leave;
521 : }
522 0 : if (*buffer)
523 0 : err = gpgsm_qualified_consent (ctrl, cl->cert);
524 : else
525 0 : err = gpgsm_not_qualified_warning (ctrl, cl->cert);
526 0 : if (err)
527 : {
528 0 : rc = err;
529 0 : goto leave;
530 : }
531 : }
532 : }
533 :
534 : /* Prepare hashing (actually we are figuring out what we have set
535 : above). */
536 0 : rc = gcry_md_open (&data_md, 0, 0);
537 0 : if (rc)
538 : {
539 0 : log_error ("md_open failed: %s\n", gpg_strerror (rc));
540 0 : goto leave;
541 : }
542 0 : if (DBG_HASHING)
543 0 : gcry_md_debug (data_md, "sign.data");
544 :
545 0 : for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
546 : {
547 0 : algo = gcry_md_map_name (algoid);
548 0 : if (!algo)
549 : {
550 0 : log_error ("unknown hash algorithm '%s'\n", algoid? algoid:"?");
551 0 : rc = gpg_error (GPG_ERR_BUG);
552 0 : goto leave;
553 : }
554 0 : gcry_md_enable (data_md, algo);
555 0 : audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
556 : }
557 :
558 0 : audit_log (ctrl->audit, AUDIT_SETUP_READY);
559 :
560 0 : if (detached)
561 : { /* We hash the data right now so that we can store the message
562 : digest. ksba_cms_build() takes this as an flag that detached
563 : data is expected. */
564 : unsigned char *digest;
565 : size_t digest_len;
566 :
567 0 : if (!hash_data (data_fd, data_md))
568 0 : audit_log (ctrl->audit, AUDIT_GOT_DATA);
569 0 : for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
570 : {
571 0 : digest = gcry_md_read (data_md, cl->hash_algo);
572 0 : digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
573 0 : if ( !digest || !digest_len )
574 : {
575 0 : log_error ("problem getting the hash of the data\n");
576 0 : rc = gpg_error (GPG_ERR_BUG);
577 0 : goto leave;
578 : }
579 0 : err = ksba_cms_set_message_digest (cms, signer, digest, digest_len);
580 0 : if (err)
581 : {
582 0 : log_error ("ksba_cms_set_message_digest failed: %s\n",
583 : gpg_strerror (err));
584 0 : rc = err;
585 0 : goto leave;
586 : }
587 : }
588 : }
589 :
590 0 : gnupg_get_isotime (signed_at);
591 0 : for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
592 : {
593 0 : err = ksba_cms_set_signing_time (cms, signer, signed_at);
594 0 : if (err)
595 : {
596 0 : log_error ("ksba_cms_set_signing_time failed: %s\n",
597 : gpg_strerror (err));
598 0 : rc = err;
599 0 : goto leave;
600 : }
601 : }
602 :
603 : /* We need to write at least a minimal list of our capabilities to
604 : try to convince some MUAs to use 3DES and not the crippled
605 : RC2. Our list is:
606 :
607 : aes128-CBC
608 : des-EDE3-CBC
609 : */
610 0 : err = ksba_cms_add_smime_capability (cms, "2.16.840.1.101.3.4.1.2", NULL, 0);
611 0 : if (!err)
612 0 : err = ksba_cms_add_smime_capability (cms, "1.2.840.113549.3.7", NULL, 0);
613 0 : if (err)
614 : {
615 0 : log_error ("ksba_cms_add_smime_capability failed: %s\n",
616 : gpg_strerror (err));
617 0 : goto leave;
618 : }
619 :
620 :
621 : /* Main building loop. */
622 : do
623 : {
624 0 : err = ksba_cms_build (cms, &stopreason);
625 0 : if (err)
626 : {
627 0 : log_debug ("ksba_cms_build failed: %s\n", gpg_strerror (err));
628 0 : rc = err;
629 0 : goto leave;
630 : }
631 :
632 0 : if (stopreason == KSBA_SR_BEGIN_DATA)
633 : {
634 : /* Hash the data and store the message digest. */
635 : unsigned char *digest;
636 : size_t digest_len;
637 :
638 0 : assert (!detached);
639 :
640 0 : rc = hash_and_copy_data (data_fd, data_md, writer);
641 0 : if (rc)
642 0 : goto leave;
643 0 : audit_log (ctrl->audit, AUDIT_GOT_DATA);
644 0 : for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
645 : {
646 0 : digest = gcry_md_read (data_md, cl->hash_algo);
647 0 : digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
648 0 : if ( !digest || !digest_len )
649 : {
650 0 : log_error ("problem getting the hash of the data\n");
651 0 : rc = gpg_error (GPG_ERR_BUG);
652 0 : goto leave;
653 : }
654 0 : err = ksba_cms_set_message_digest (cms, signer,
655 : digest, digest_len);
656 0 : if (err)
657 : {
658 0 : log_error ("ksba_cms_set_message_digest failed: %s\n",
659 : gpg_strerror (err));
660 0 : rc = err;
661 0 : goto leave;
662 : }
663 : }
664 : }
665 0 : else if (stopreason == KSBA_SR_NEED_SIG)
666 : {
667 : /* Compute the signature for all signers. */
668 : gcry_md_hd_t md;
669 :
670 0 : rc = gcry_md_open (&md, 0, 0);
671 0 : if (rc)
672 : {
673 0 : log_error ("md_open failed: %s\n", gpg_strerror (rc));
674 0 : goto leave;
675 : }
676 0 : if (DBG_HASHING)
677 0 : gcry_md_debug (md, "sign.attr");
678 0 : ksba_cms_set_hash_function (cms, HASH_FNC, md);
679 0 : for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
680 : {
681 0 : unsigned char *sigval = NULL;
682 : char *buf, *fpr;
683 :
684 0 : audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);
685 0 : if (signer)
686 0 : gcry_md_reset (md);
687 : {
688 : certlist_t cl_tmp;
689 :
690 0 : for (cl_tmp=signerlist; cl_tmp; cl_tmp = cl_tmp->next)
691 : {
692 0 : gcry_md_enable (md, cl_tmp->hash_algo);
693 0 : audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO,
694 : cl_tmp->hash_algo);
695 : }
696 : }
697 :
698 0 : rc = ksba_cms_hash_signed_attrs (cms, signer);
699 0 : if (rc)
700 : {
701 0 : log_debug ("hashing signed attrs failed: %s\n",
702 : gpg_strerror (rc));
703 0 : gcry_md_close (md);
704 0 : goto leave;
705 : }
706 :
707 0 : rc = gpgsm_create_cms_signature (ctrl, cl->cert,
708 : md, cl->hash_algo, &sigval);
709 0 : if (rc)
710 : {
711 0 : audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, rc);
712 0 : gcry_md_close (md);
713 0 : goto leave;
714 : }
715 :
716 0 : err = ksba_cms_set_sig_val (cms, signer, sigval);
717 0 : xfree (sigval);
718 0 : if (err)
719 : {
720 0 : audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, err);
721 0 : log_error ("failed to store the signature: %s\n",
722 : gpg_strerror (err));
723 0 : rc = err;
724 0 : gcry_md_close (md);
725 0 : goto leave;
726 : }
727 :
728 : /* write a status message */
729 0 : fpr = gpgsm_get_fingerprint_hexstring (cl->cert, GCRY_MD_SHA1);
730 0 : if (!fpr)
731 : {
732 0 : rc = gpg_error (GPG_ERR_ENOMEM);
733 0 : gcry_md_close (md);
734 0 : goto leave;
735 : }
736 0 : rc = 0;
737 : {
738 0 : int pkalgo = gpgsm_get_key_algo_info (cl->cert, NULL);
739 0 : buf = xtryasprintf ("%c %d %d 00 %s %s",
740 : detached? 'D':'S',
741 : pkalgo,
742 : cl->hash_algo,
743 : signed_at,
744 : fpr);
745 0 : if (!buf)
746 0 : rc = gpg_error_from_syserror ();
747 : }
748 0 : xfree (fpr);
749 0 : if (rc)
750 : {
751 0 : gcry_md_close (md);
752 0 : goto leave;
753 : }
754 0 : gpgsm_status (ctrl, STATUS_SIG_CREATED, buf);
755 0 : xfree (buf);
756 0 : audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, 0);
757 : }
758 0 : gcry_md_close (md);
759 : }
760 : }
761 0 : while (stopreason != KSBA_SR_READY);
762 :
763 0 : rc = gpgsm_finish_writer (b64writer);
764 0 : if (rc)
765 : {
766 0 : log_error ("write failed: %s\n", gpg_strerror (rc));
767 0 : goto leave;
768 : }
769 :
770 0 : audit_log (ctrl->audit, AUDIT_SIGNING_DONE);
771 0 : log_info ("signature created\n");
772 :
773 :
774 : leave:
775 0 : if (rc)
776 0 : log_error ("error creating signature: %s <%s>\n",
777 : gpg_strerror (rc), gpg_strsource (rc) );
778 0 : if (release_signerlist)
779 0 : gpgsm_release_certlist (signerlist);
780 0 : ksba_cms_release (cms);
781 0 : gpgsm_destroy_writer (b64writer);
782 0 : keydb_release (kh);
783 0 : gcry_md_close (data_md);
784 0 : return rc;
785 : }
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