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cms_sd.c
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1 /* crypto/cms/cms_sd.c */
2 /* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  * software must display the following acknowledgment:
22  * "This product includes software developed by the OpenSSL Project
23  * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  * endorse or promote products derived from this software without
27  * prior written permission. For written permission, please contact
28  * [email protected].
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  * nor may "OpenSSL" appear in their names without prior written
32  * permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  * acknowledgment:
36  * "This product includes software developed by the OpenSSL Project
37  * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  */
53 
54 #include "cryptlib.h"
55 #include <openssl/asn1t.h>
56 #include <openssl/pem.h>
57 #include <openssl/x509v3.h>
58 #include <openssl/err.h>
59 #include <openssl/cms.h>
60 #include "cms_lcl.h"
61 #include "asn1_locl.h"
62 
63 /* CMS SignedData Utilities */
64 
65 DECLARE_ASN1_ITEM(CMS_SignedData)
66 
67 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
68  {
69  if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed)
70  {
71  CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
72  return NULL;
73  }
74  return cms->d.signedData;
75  }
76 
77 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
78  {
79  if (cms->d.other == NULL)
80  {
81  cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
82  if (!cms->d.signedData)
83  {
84  CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
85  return NULL;
86  }
87  cms->d.signedData->version = 1;
88  cms->d.signedData->encapContentInfo->eContentType =
89  OBJ_nid2obj(NID_pkcs7_data);
90  cms->d.signedData->encapContentInfo->partial = 1;
91  ASN1_OBJECT_free(cms->contentType);
92  cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
93  return cms->d.signedData;
94  }
95  return cms_get0_signed(cms);
96  }
97 
98 /* Just initialize SignedData e.g. for certs only structure */
99 
100 int CMS_SignedData_init(CMS_ContentInfo *cms)
101  {
102  if (cms_signed_data_init(cms))
103  return 1;
104  else
105  return 0;
106  }
107 
108 /* Check structures and fixup version numbers (if necessary) */
109 
110 static void cms_sd_set_version(CMS_SignedData *sd)
111  {
112  int i;
113  CMS_CertificateChoices *cch;
114  CMS_RevocationInfoChoice *rch;
115  CMS_SignerInfo *si;
116 
117  for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
118  {
119  cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
120  if (cch->type == CMS_CERTCHOICE_OTHER)
121  {
122  if (sd->version < 5)
123  sd->version = 5;
124  }
125  else if (cch->type == CMS_CERTCHOICE_V2ACERT)
126  {
127  if (sd->version < 4)
128  sd->version = 4;
129  }
130  else if (cch->type == CMS_CERTCHOICE_V1ACERT)
131  {
132  if (sd->version < 3)
133  sd->version = 3;
134  }
135  }
136 
137  for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
138  {
139  rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
140  if (rch->type == CMS_REVCHOICE_OTHER)
141  {
142  if (sd->version < 5)
143  sd->version = 5;
144  }
145  }
146 
147  if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
148  && (sd->version < 3))
149  sd->version = 3;
150 
151  for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
152  {
153  si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
154  if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
155  {
156  if (si->version < 3)
157  si->version = 3;
158  if (sd->version < 3)
159  sd->version = 3;
160  }
161  else
162  sd->version = 1;
163  }
164 
165  if (sd->version < 1)
166  sd->version = 1;
167 
168  }
169 
170 /* Copy an existing messageDigest value */
171 
172 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
173  {
174  STACK_OF(CMS_SignerInfo) *sinfos;
175  CMS_SignerInfo *sitmp;
176  int i;
177  sinfos = CMS_get0_SignerInfos(cms);
178  for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
179  {
180  ASN1_OCTET_STRING *messageDigest;
181  sitmp = sk_CMS_SignerInfo_value(sinfos, i);
182  if (sitmp == si)
183  continue;
184  if (CMS_signed_get_attr_count(sitmp) < 0)
185  continue;
186  if (OBJ_cmp(si->digestAlgorithm->algorithm,
187  sitmp->digestAlgorithm->algorithm))
188  continue;
189  messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
190  OBJ_nid2obj(NID_pkcs9_messageDigest),
191  -3, V_ASN1_OCTET_STRING);
192  if (!messageDigest)
193  {
194  CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
195  CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
196  return 0;
197  }
198 
199  if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
200  V_ASN1_OCTET_STRING,
201  messageDigest, -1))
202  return 1;
203  else
204  return 0;
205  }
206  CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
207  return 0;
208  }
209 
210 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
211  {
212  switch(type)
213  {
214  case CMS_SIGNERINFO_ISSUER_SERIAL:
215  sid->d.issuerAndSerialNumber =
216  M_ASN1_new_of(CMS_IssuerAndSerialNumber);
217  if (!sid->d.issuerAndSerialNumber)
218  goto merr;
219  if (!X509_NAME_set(&sid->d.issuerAndSerialNumber->issuer,
220  X509_get_issuer_name(cert)))
221  goto merr;
222  if (!ASN1_STRING_copy(
223  sid->d.issuerAndSerialNumber->serialNumber,
224  X509_get_serialNumber(cert)))
225  goto merr;
226  break;
227 
228  case CMS_SIGNERINFO_KEYIDENTIFIER:
229  if (!cert->skid)
230  {
231  CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER,
232  CMS_R_CERTIFICATE_HAS_NO_KEYID);
233  return 0;
234  }
235  sid->d.subjectKeyIdentifier = ASN1_STRING_dup(cert->skid);
236  if (!sid->d.subjectKeyIdentifier)
237  goto merr;
238  break;
239 
240  default:
241  CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
242  return 0;
243  }
244 
245  sid->type = type;
246 
247  return 1;
248 
249  merr:
250  CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, ERR_R_MALLOC_FAILURE);
251  return 0;
252 
253  }
254 
255 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
256  ASN1_OCTET_STRING **keyid,
257  X509_NAME **issuer, ASN1_INTEGER **sno)
258  {
259  if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
260  {
261  if (issuer)
262  *issuer = sid->d.issuerAndSerialNumber->issuer;
263  if (sno)
264  *sno = sid->d.issuerAndSerialNumber->serialNumber;
265  }
266  else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
267  {
268  if (keyid)
269  *keyid = sid->d.subjectKeyIdentifier;
270  }
271  else
272  return 0;
273  return 1;
274  }
275 
276 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
277  {
278  int ret;
279  if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
280  {
281  ret = X509_NAME_cmp(sid->d.issuerAndSerialNumber->issuer,
282  X509_get_issuer_name(cert));
283  if (ret)
284  return ret;
285  return ASN1_INTEGER_cmp(sid->d.issuerAndSerialNumber->serialNumber,
286  X509_get_serialNumber(cert));
287  }
288  else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
289  {
290  X509_check_purpose(cert, -1, -1);
291  if (!cert->skid)
292  return -1;
293  return ASN1_OCTET_STRING_cmp(sid->d.subjectKeyIdentifier,
294  cert->skid);
295  }
296  else
297  return -1;
298  }
299 
300 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
301  X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
302  unsigned int flags)
303  {
304  CMS_SignedData *sd;
305  CMS_SignerInfo *si = NULL;
306  X509_ALGOR *alg;
307  int i, type;
308  if(!X509_check_private_key(signer, pk))
309  {
310  CMSerr(CMS_F_CMS_ADD1_SIGNER,
311  CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
312  return NULL;
313  }
314  sd = cms_signed_data_init(cms);
315  if (!sd)
316  goto err;
317  si = M_ASN1_new_of(CMS_SignerInfo);
318  if (!si)
319  goto merr;
320  X509_check_purpose(signer, -1, -1);
321 
322  CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
323  CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
324 
325  si->pkey = pk;
326  si->signer = signer;
327 
328  if (flags & CMS_USE_KEYID)
329  {
330  si->version = 3;
331  if (sd->version < 3)
332  sd->version = 3;
333  type = CMS_SIGNERINFO_KEYIDENTIFIER;
334  }
335  else
336  {
337  type = CMS_SIGNERINFO_ISSUER_SERIAL;
338  si->version = 1;
339  }
340 
341  if (!cms_set1_SignerIdentifier(si->sid, signer, type))
342  goto err;
343 
344  if (md == NULL)
345  {
346  int def_nid;
347  if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
348  goto err;
349  md = EVP_get_digestbynid(def_nid);
350  if (md == NULL)
351  {
352  CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
353  goto err;
354  }
355  }
356 
357  if (!md)
358  {
359  CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
360  goto err;
361  }
362 
363  cms_DigestAlgorithm_set(si->digestAlgorithm, md);
364 
365  /* See if digest is present in digestAlgorithms */
366  for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
367  {
368  ASN1_OBJECT *aoid;
369  alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
370  X509_ALGOR_get0(&aoid, NULL, NULL, alg);
371  if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
372  break;
373  }
374 
375  if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
376  {
377  alg = X509_ALGOR_new();
378  if (!alg)
379  goto merr;
380  cms_DigestAlgorithm_set(alg, md);
381  if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
382  {
383  X509_ALGOR_free(alg);
384  goto merr;
385  }
386  }
387 
388  if (pk->ameth && pk->ameth->pkey_ctrl)
389  {
390  i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_SIGN,
391  0, si);
392  if (i == -2)
393  {
394  CMSerr(CMS_F_CMS_ADD1_SIGNER,
395  CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
396  goto err;
397  }
398  if (i <= 0)
399  {
400  CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_CTRL_FAILURE);
401  goto err;
402  }
403  }
404 
405  if (!(flags & CMS_NOATTR))
406  {
407  /* Initialialize signed attributes strutucture so other
408  * attributes such as signing time etc are added later
409  * even if we add none here.
410  */
411  if (!si->signedAttrs)
412  {
413  si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
414  if (!si->signedAttrs)
415  goto merr;
416  }
417 
418  if (!(flags & CMS_NOSMIMECAP))
419  {
420  STACK_OF(X509_ALGOR) *smcap = NULL;
421  i = CMS_add_standard_smimecap(&smcap);
422  if (i)
423  i = CMS_add_smimecap(si, smcap);
424  sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
425  if (!i)
426  goto merr;
427  }
428  if (flags & CMS_REUSE_DIGEST)
429  {
430  if (!cms_copy_messageDigest(cms, si))
431  goto err;
432  if (!(flags & CMS_PARTIAL) &&
433  !CMS_SignerInfo_sign(si))
434  goto err;
435  }
436  }
437 
438  if (!(flags & CMS_NOCERTS))
439  {
440  /* NB ignore -1 return for duplicate cert */
441  if (!CMS_add1_cert(cms, signer))
442  goto merr;
443  }
444 
445  if (!sd->signerInfos)
446  sd->signerInfos = sk_CMS_SignerInfo_new_null();
447  if (!sd->signerInfos ||
448  !sk_CMS_SignerInfo_push(sd->signerInfos, si))
449  goto merr;
450 
451  return si;
452 
453  merr:
454  CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
455  err:
456  if (si)
457  M_ASN1_free_of(si, CMS_SignerInfo);
458  return NULL;
459 
460  }
461 
462 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
463  {
464  ASN1_TIME *tt;
465  int r = 0;
466  if (t)
467  tt = t;
468  else
469  tt = X509_gmtime_adj(NULL, 0);
470 
471  if (!tt)
472  goto merr;
473 
474  if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
475  tt->type, tt, -1) <= 0)
476  goto merr;
477 
478  r = 1;
479 
480  merr:
481 
482  if (!t)
483  ASN1_TIME_free(tt);
484 
485  if (!r)
486  CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
487 
488  return r;
489 
490  }
491 
492 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
493  {
494  CMS_SignedData *sd;
495  sd = cms_get0_signed(cms);
496  if (!sd)
497  return NULL;
498  return sd->signerInfos;
499  }
500 
501 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
502  {
503  STACK_OF(X509) *signers = NULL;
504  STACK_OF(CMS_SignerInfo) *sinfos;
505  CMS_SignerInfo *si;
506  int i;
507  sinfos = CMS_get0_SignerInfos(cms);
508  for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
509  {
510  si = sk_CMS_SignerInfo_value(sinfos, i);
511  if (si->signer)
512  {
513  if (!signers)
514  {
515  signers = sk_X509_new_null();
516  if (!signers)
517  return NULL;
518  }
519  if (!sk_X509_push(signers, si->signer))
520  {
521  sk_X509_free(signers);
522  return NULL;
523  }
524  }
525  }
526  return signers;
527  }
528 
529 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
530  {
531  if (signer)
532  {
533  CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
534  if (si->pkey)
535  EVP_PKEY_free(si->pkey);
536  si->pkey = X509_get_pubkey(signer);
537  }
538  if (si->signer)
539  X509_free(si->signer);
540  si->signer = signer;
541  }
542 
543 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
544  ASN1_OCTET_STRING **keyid,
545  X509_NAME **issuer, ASN1_INTEGER **sno)
546  {
547  return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
548  }
549 
550 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
551  {
552  return cms_SignerIdentifier_cert_cmp(si->sid, cert);
553  }
554 
555 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
556  unsigned int flags)
557  {
558  CMS_SignedData *sd;
559  CMS_SignerInfo *si;
560  CMS_CertificateChoices *cch;
561  STACK_OF(CMS_CertificateChoices) *certs;
562  X509 *x;
563  int i, j;
564  int ret = 0;
565  sd = cms_get0_signed(cms);
566  if (!sd)
567  return -1;
568  certs = sd->certificates;
569  for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
570  {
571  si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
572  if (si->signer)
573  continue;
574 
575  for (j = 0; j < sk_X509_num(scerts); j++)
576  {
577  x = sk_X509_value(scerts, j);
578  if (CMS_SignerInfo_cert_cmp(si, x) == 0)
579  {
580  CMS_SignerInfo_set1_signer_cert(si, x);
581  ret++;
582  break;
583  }
584  }
585 
586  if (si->signer || (flags & CMS_NOINTERN))
587  continue;
588 
589  for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
590  {
591  cch = sk_CMS_CertificateChoices_value(certs, j);
592  if (cch->type != 0)
593  continue;
594  x = cch->d.certificate;
595  if (CMS_SignerInfo_cert_cmp(si, x) == 0)
596  {
597  CMS_SignerInfo_set1_signer_cert(si, x);
598  ret++;
599  break;
600  }
601  }
602  }
603  return ret;
604  }
605 
606 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
607  X509_ALGOR **pdig, X509_ALGOR **psig)
608  {
609  if (pk)
610  *pk = si->pkey;
611  if (signer)
612  *signer = si->signer;
613  if (pdig)
614  *pdig = si->digestAlgorithm;
615  if (psig)
616  *psig = si->signatureAlgorithm;
617  }
618 
619 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
620  CMS_SignerInfo *si, BIO *chain)
621  {
622  EVP_MD_CTX mctx;
623  int r = 0;
624  EVP_MD_CTX_init(&mctx);
625 
626 
627  if (!si->pkey)
628  {
629  CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
630  return 0;
631  }
632 
633  if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
634  goto err;
635 
636  /* If any signed attributes calculate and add messageDigest attribute */
637 
638  if (CMS_signed_get_attr_count(si) >= 0)
639  {
640  ASN1_OBJECT *ctype =
641  cms->d.signedData->encapContentInfo->eContentType;
642  unsigned char md[EVP_MAX_MD_SIZE];
643  unsigned int mdlen;
644  if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
645  goto err;
646  if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
647  V_ASN1_OCTET_STRING,
648  md, mdlen))
649  goto err;
650  /* Copy content type across */
651  if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
652  V_ASN1_OBJECT, ctype, -1) <= 0)
653  goto err;
654  if (!CMS_SignerInfo_sign(si))
655  goto err;
656  }
657  else
658  {
659  unsigned char *sig;
660  unsigned int siglen;
661  sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
662  if (!sig)
663  {
664  CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
665  ERR_R_MALLOC_FAILURE);
666  goto err;
667  }
668  if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
669  {
670  CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
671  CMS_R_SIGNFINAL_ERROR);
672  OPENSSL_free(sig);
673  goto err;
674  }
675  ASN1_STRING_set0(si->signature, sig, siglen);
676  }
677 
678  r = 1;
679 
680  err:
681  EVP_MD_CTX_cleanup(&mctx);
682  return r;
683 
684  }
685 
686 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
687  {
688  STACK_OF(CMS_SignerInfo) *sinfos;
689  CMS_SignerInfo *si;
690  int i;
691  sinfos = CMS_get0_SignerInfos(cms);
692  for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
693  {
694  si = sk_CMS_SignerInfo_value(sinfos, i);
695  if (!cms_SignerInfo_content_sign(cms, si, chain))
696  return 0;
697  }
698  cms->d.signedData->encapContentInfo->partial = 0;
699  return 1;
700  }
701 
702 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
703  {
704  EVP_MD_CTX mctx;
705  EVP_PKEY_CTX *pctx;
706  unsigned char *abuf = NULL;
707  int alen;
708  size_t siglen;
709  const EVP_MD *md = NULL;
710 
711  md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
712  if (md == NULL)
713  return 0;
714 
715  EVP_MD_CTX_init(&mctx);
716 
717  if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
718  {
719  if (!cms_add1_signingTime(si, NULL))
720  goto err;
721  }
722 
723  if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
724  goto err;
725 
726  if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
727  EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
728  {
729  CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
730  goto err;
731  }
732 
733  alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
734  ASN1_ITEM_rptr(CMS_Attributes_Sign));
735  if(!abuf)
736  goto err;
737  if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
738  goto err;
739  if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
740  goto err;
741  OPENSSL_free(abuf);
742  abuf = OPENSSL_malloc(siglen);
743  if(!abuf)
744  goto err;
745  if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
746  goto err;
747 
748  if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
749  EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
750  {
751  CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
752  goto err;
753  }
754 
755  EVP_MD_CTX_cleanup(&mctx);
756 
757  ASN1_STRING_set0(si->signature, abuf, siglen);
758 
759  return 1;
760 
761  err:
762  if (abuf)
763  OPENSSL_free(abuf);
764  EVP_MD_CTX_cleanup(&mctx);
765  return 0;
766 
767  }
768 
769 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
770  {
771  EVP_MD_CTX mctx;
772  EVP_PKEY_CTX *pctx;
773  unsigned char *abuf = NULL;
774  int alen, r = -1;
775  const EVP_MD *md = NULL;
776 
777  if (!si->pkey)
778  {
779  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
780  return -1;
781  }
782 
783  md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
784  if (md == NULL)
785  return -1;
786  EVP_MD_CTX_init(&mctx);
787  if (EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
788  goto err;
789 
790  alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
791  ASN1_ITEM_rptr(CMS_Attributes_Verify));
792  if(!abuf)
793  goto err;
794  r = EVP_DigestVerifyUpdate(&mctx, abuf, alen);
795  OPENSSL_free(abuf);
796  if (r <= 0)
797  {
798  r = -1;
799  goto err;
800  }
801  r = EVP_DigestVerifyFinal(&mctx,
802  si->signature->data, si->signature->length);
803  if (r <= 0)
804  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
805  err:
806  EVP_MD_CTX_cleanup(&mctx);
807  return r;
808  }
809 
810 /* Create a chain of digest BIOs from a CMS ContentInfo */
811 
812 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
813  {
814  int i;
815  CMS_SignedData *sd;
816  BIO *chain = NULL;
817  sd = cms_get0_signed(cms);
818  if (!sd)
819  return NULL;
820  if (cms->d.signedData->encapContentInfo->partial)
821  cms_sd_set_version(sd);
822  for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
823  {
824  X509_ALGOR *digestAlgorithm;
825  BIO *mdbio;
826  digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
827  mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
828  if (!mdbio)
829  goto err;
830  if (chain)
831  BIO_push(chain, mdbio);
832  else
833  chain = mdbio;
834  }
835  return chain;
836  err:
837  if (chain)
838  BIO_free_all(chain);
839  return NULL;
840  }
841 
842 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
843  {
844  ASN1_OCTET_STRING *os = NULL;
845  EVP_MD_CTX mctx;
846  int r = -1;
847  EVP_MD_CTX_init(&mctx);
848  /* If we have any signed attributes look for messageDigest value */
849  if (CMS_signed_get_attr_count(si) >= 0)
850  {
851  os = CMS_signed_get0_data_by_OBJ(si,
852  OBJ_nid2obj(NID_pkcs9_messageDigest),
853  -3, V_ASN1_OCTET_STRING);
854  if (!os)
855  {
856  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
857  CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
858  goto err;
859  }
860  }
861 
862  if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
863  goto err;
864 
865  /* If messageDigest found compare it */
866 
867  if (os)
868  {
869  unsigned char mval[EVP_MAX_MD_SIZE];
870  unsigned int mlen;
871  if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
872  {
873  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
874  CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
875  goto err;
876  }
877  if (mlen != (unsigned int)os->length)
878  {
879  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
880  CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
881  goto err;
882  }
883 
884  if (memcmp(mval, os->data, mlen))
885  {
886  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
887  CMS_R_VERIFICATION_FAILURE);
888  r = 0;
889  }
890  else
891  r = 1;
892  }
893  else
894  {
895  r = EVP_VerifyFinal(&mctx, si->signature->data,
896  si->signature->length, si->pkey);
897  if (r <= 0)
898  {
899  CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
900  CMS_R_VERIFICATION_FAILURE);
901  r = 0;
902  }
903  }
904 
905  err:
906  EVP_MD_CTX_cleanup(&mctx);
907  return r;
908 
909  }
910 
911 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
912  {
913  unsigned char *smder = NULL;
914  int smderlen, r;
915  smderlen = i2d_X509_ALGORS(algs, &smder);
916  if (smderlen <= 0)
917  return 0;
918  r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
919  V_ASN1_SEQUENCE, smder, smderlen);
920  OPENSSL_free(smder);
921  return r;
922  }
923 
924 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
925  int algnid, int keysize)
926  {
927  X509_ALGOR *alg;
928  ASN1_INTEGER *key = NULL;
929  if (keysize > 0)
930  {
931  key = ASN1_INTEGER_new();
932  if (!key || !ASN1_INTEGER_set(key, keysize))
933  return 0;
934  }
935  alg = X509_ALGOR_new();
936  if (!alg)
937  {
938  if (key)
939  ASN1_INTEGER_free(key);
940  return 0;
941  }
942 
943  X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
944  key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
945  if (!*algs)
946  *algs = sk_X509_ALGOR_new_null();
947  if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
948  {
949  X509_ALGOR_free(alg);
950  return 0;
951  }
952  return 1;
953  }
954 
955 /* Check to see if a cipher exists and if so add S/MIME capabilities */
956 
957 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
958  {
959  if (EVP_get_cipherbynid(nid))
960  return CMS_add_simple_smimecap(sk, nid, arg);
961  return 1;
962  }
963 
964 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
965  {
966  if (EVP_get_digestbynid(nid))
967  return CMS_add_simple_smimecap(sk, nid, arg);
968  return 1;
969  }
970 
971 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
972  {
973  if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
974  || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
975  || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
976  || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
977  || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
978  || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
979  || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
980  || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
981  || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
982  || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
983  return 0;
984  return 1;
985  }
Generated on Thu Jan 10 2013 09:53:35 for OpenSSL by   doxygen 1.8.2