1 /* crypto/cms/cms_lib.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 * licensing@OpenSSL.org.
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 <openssl/asn1t.h>
55 #include <openssl/x509.h>
56 #include <openssl/err.h>
57 #include <openssl/pem.h>
58 #include <openssl/bio.h>
59 #include <openssl/asn1.h>
60 #include <openssl/cms.h>
61 #include <cms_lcl.h>
62
63 IMPLEMENT_ASN1_FUNCTIONS(CMS_ContentInfo)
64 IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
65
66 DECLARE_ASN1_ITEM(CMS_CertificateChoices)
67 DECLARE_ASN1_ITEM(CMS_RevocationInfoChoice)
68 DECLARE_STACK_OF(CMS_CertificateChoices)
69 DECLARE_STACK_OF(CMS_RevocationInfoChoice)
70
71 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
72 {
73 return cms->contentType;
74 }
75
76 CMS_ContentInfo *cms_Data_create(void)
77 {
78 CMS_ContentInfo *cms;
79 cms = CMS_ContentInfo_new();
80 if (cms)
81 {
82 cms->contentType = OBJ_nid2obj(NID_pkcs7_data);
83 /* Never detached */
84 CMS_set_detached(cms, 0);
85 }
86 return cms;
87 }
88
89 BIO *cms_content_bio(CMS_ContentInfo *cms)
90 {
91 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
92 if (!pos)
93 return NULL;
94 /* If content detached data goes nowhere: create NULL BIO */
95 if (!*pos)
96 return BIO_new(BIO_s_null());
97 /* If content not detached and created return memory BIO
98 */
99 if (!*pos || ((*pos)->flags == ASN1_STRING_FLAG_CONT))
100 return BIO_new(BIO_s_mem());
101 /* Else content was read in: return read only BIO for it */
102 return BIO_new_mem_buf((*pos)->data, (*pos)->length);
103 }
104
105 BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
106 {
107 BIO *cmsbio, *cont;
108 if (icont)
109 cont = icont;
110 else
111 cont = cms_content_bio(cms);
112 if (!cont)
113 {
114 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_NO_CONTENT);
115 return NULL;
116 }
117 switch (OBJ_obj2nid(cms->contentType))
118 {
119
120 case NID_pkcs7_data:
121 return cont;
122
123 case NID_pkcs7_signed:
124 cmsbio = cms_SignedData_init_bio(cms);
125 break;
126
127 case NID_pkcs7_digest:
128 cmsbio = cms_DigestedData_init_bio(cms);
129 break;
130 #ifdef ZLIB
131 case NID_id_smime_ct_compressedData:
132 cmsbio = cms_CompressedData_init_bio(cms);
133 break;
134 #endif
135
136 case NID_pkcs7_encrypted:
137 cmsbio = cms_EncryptedData_init_bio(cms);
138 break;
139
140 case NID_pkcs7_enveloped:
141 cmsbio = cms_EnvelopedData_init_bio(cms);
142 break;
143
144 default:
145 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE);
146 return NULL;
147 }
148
149 if (cmsbio)
150 return BIO_push(cmsbio, cont);
151
152 if (!icont)
153 BIO_free(cont);
154 return NULL;
155
156 }
157
158 int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio)
159 {
160 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
161 if (!pos)
162 return 0;
163 /* If ebmedded content find memory BIO and set content */
164 if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT))
165 {
166 BIO *mbio;
167 unsigned char *cont;
168 long contlen;
169 mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM);
170 if (!mbio)
171 {
172 CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_CONTENT_NOT_FOUND);
173 return 0;
174 }
175 contlen = BIO_get_mem_data(mbio, &cont);
176 /* Set bio as read only so its content can't be clobbered */
177 BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
178 BIO_set_mem_eof_return(mbio, 0);
179 ASN1_STRING_set0(*pos, cont, contlen);
180 (*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
181 }
182
183 switch (OBJ_obj2nid(cms->contentType))
184 {
185
186 case NID_pkcs7_data:
187 case NID_pkcs7_enveloped:
188 case NID_pkcs7_encrypted:
189 case NID_id_smime_ct_compressedData:
190 /* Nothing to do */
191 return 1;
192
193 case NID_pkcs7_signed:
194 return cms_SignedData_final(cms, cmsbio);
195
196 case NID_pkcs7_digest:
197 return cms_DigestedData_do_final(cms, cmsbio, 0);
198
199 default:
200 CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_UNSUPPORTED_TYPE);
201 return 0;
202 }
203 }
204
205 /* Return an OCTET STRING pointer to content. This allows it to
206 * be accessed or set later.
207 */
208
209 ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms)
210 {
211 switch (OBJ_obj2nid(cms->contentType))
212 {
213
214 case NID_pkcs7_data:
215 return &cms->d.data;
216
217 case NID_pkcs7_signed:
218 return &cms->d.signedData->encapContentInfo->eContent;
219
220 case NID_pkcs7_enveloped:
221 return &cms->d.envelopedData->encryptedContentInfo->encryptedContent;
222
223 case NID_pkcs7_digest:
224 return &cms->d.digestedData->encapContentInfo->eContent;
225
226 case NID_pkcs7_encrypted:
227 return &cms->d.encryptedData->encryptedContentInfo->encryptedContent;
228
229 case NID_id_smime_ct_authData:
230 return &cms->d.authenticatedData->encapContentInfo->eContent;
231
232 case NID_id_smime_ct_compressedData:
233 return &cms->d.compressedData->encapContentInfo->eContent;
234
235 default:
236 if (cms->d.other->type == V_ASN1_OCTET_STRING)
237 return &cms->d.other->value.octet_string;
238 CMSerr(CMS_F_CMS_GET0_CONTENT, CMS_R_UNSUPPORTED_CONTENT_TYPE);
239 return NULL;
240
241 }
242 }
243
244 /* Return an ASN1_OBJECT pointer to content type. This allows it to
245 * be accessed or set later.
246 */
247
248 static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms)
249 {
250 switch (OBJ_obj2nid(cms->contentType))
251 {
252
253 case NID_pkcs7_signed:
254 return &cms->d.signedData->encapContentInfo->eContentType;
255
256 case NID_pkcs7_enveloped:
257 return &cms->d.envelopedData->encryptedContentInfo->contentType;
258
259 case NID_pkcs7_digest:
260 return &cms->d.digestedData->encapContentInfo->eContentType;
261
262 case NID_pkcs7_encrypted:
263 return &cms->d.encryptedData->encryptedContentInfo->contentType;
264
265 case NID_id_smime_ct_authData:
266 return &cms->d.authenticatedData->encapContentInfo->eContentType;
267
268 case NID_id_smime_ct_compressedData:
269 return &cms->d.compressedData->encapContentInfo->eContentType;
270
271 default:
272 CMSerr(CMS_F_CMS_GET0_ECONTENT_TYPE,
273 CMS_R_UNSUPPORTED_CONTENT_TYPE);
274 return NULL;
275
276 }
277 }
278
279 const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms)
280 {
281 ASN1_OBJECT **petype;
282 petype = cms_get0_econtent_type(cms);
283 if (petype)
284 return *petype;
285 return NULL;
286 }
287
288 int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid)
289 {
290 ASN1_OBJECT **petype, *etype;
291 petype = cms_get0_econtent_type(cms);
292 if (!petype)
293 return 0;
294 if (!oid)
295 return 1;
296 etype = OBJ_dup(oid);
297 if (!etype)
298 return 0;
299 ASN1_OBJECT_free(*petype);
300 *petype = etype;
301 return 1;
302 }
303
304 int CMS_is_detached(CMS_ContentInfo *cms)
305 {
306 ASN1_OCTET_STRING **pos;
307 pos = CMS_get0_content(cms);
308 if (!pos)
309 return -1;
310 if (*pos)
311 return 0;
312 return 1;
313 }
314
315 int CMS_set_detached(CMS_ContentInfo *cms, int detached)
316 {
317 ASN1_OCTET_STRING **pos;
318 pos = CMS_get0_content(cms);
319 if (!pos)
320 return 0;
321 if (detached)
322 {
323 if (*pos)
324 {
325 ASN1_OCTET_STRING_free(*pos);
326 *pos = NULL;
327 }
328 return 1;
329 }
330 if (!*pos)
331 *pos = ASN1_OCTET_STRING_new();
332 if (*pos)
333 {
334 /* NB: special flag to show content is created and not
335 * read in.
336 */
337 (*pos)->flags |= ASN1_STRING_FLAG_CONT;
338 return 1;
339 }
340 CMSerr(CMS_F_CMS_SET_DETACHED, ERR_R_MALLOC_FAILURE);
341 return 0;
342 }
343
344 /* Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD */
345
346 void cms_DigestAlgorithm_set(X509_ALGOR *alg, const EVP_MD *md)
347 {
348 int param_type;
349
350 if (md->flags & EVP_MD_FLAG_DIGALGID_ABSENT)
351 param_type = V_ASN1_UNDEF;
352 else
353 param_type = V_ASN1_NULL;
354
355 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_type(md)), param_type, NULL);
356
357 }
358
359 /* Create a digest BIO from an X509_ALGOR structure */
360
361 BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm)
362 {
363 BIO *mdbio = NULL;
364 ASN1_OBJECT *digestoid;
365 const EVP_MD *digest;
366 X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm);
367 digest = EVP_get_digestbyobj(digestoid);
368 if (!digest)
369 {
370 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
371 CMS_R_UNKNOWN_DIGEST_ALGORIHM);
372 goto err;
373 }
374 mdbio = BIO_new(BIO_f_md());
375 if (!mdbio || !BIO_set_md(mdbio, digest))
376 {
377 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
378 CMS_R_MD_BIO_INIT_ERROR);
379 goto err;
380 }
381 return mdbio;
382 err:
383 if (mdbio)
384 BIO_free(mdbio);
385 return NULL;
386 }
387
388 /* Locate a message digest content from a BIO chain based on SignerInfo */
389
390 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
391 X509_ALGOR *mdalg)
392 {
393 int nid;
394 ASN1_OBJECT *mdoid;
395 X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg);
396 nid = OBJ_obj2nid(mdoid);
397 /* Look for digest type to match signature */
398 for (;;)
399 {
400 EVP_MD_CTX *mtmp;
401 chain = BIO_find_type(chain, BIO_TYPE_MD);
402 if (chain == NULL)
403 {
404 CMSerr(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX,
405 CMS_R_NO_MATCHING_DIGEST);
406 return 0;
407 }
408 BIO_get_md_ctx(chain, &mtmp);
409 if (EVP_MD_CTX_type(mtmp) == nid
410 /* Workaround for broken implementations that use signature
411 * algorithm OID instead of digest.
412 */
413 || EVP_MD_pkey_type(EVP_MD_CTX_md(mtmp)) == nid)
414 return EVP_MD_CTX_copy_ex(mctx, mtmp);
415 chain = BIO_next(chain);
416 }
417 }
418
419 static STACK_OF(CMS_CertificateChoices) **cms_get0_certificate_choices(CMS_ContentInfo *cms)
420 {
421 switch (OBJ_obj2nid(cms->contentType))
422 {
423
424 case NID_pkcs7_signed:
425 return &cms->d.signedData->certificates;
426
427 case NID_pkcs7_enveloped:
428 return &cms->d.envelopedData->originatorInfo->certificates;
429
430 default:
431 CMSerr(CMS_F_CMS_GET0_CERTIFICATE_CHOICES,
432 CMS_R_UNSUPPORTED_CONTENT_TYPE);
433 return NULL;
434
435 }
436 }
437
438 CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms)
439 {
440 STACK_OF(CMS_CertificateChoices) **pcerts;
441 CMS_CertificateChoices *cch;
442 pcerts = cms_get0_certificate_choices(cms);
443 if (!pcerts)
444 return NULL;
445 if (!*pcerts)
446 *pcerts = sk_CMS_CertificateChoices_new_null();
447 if (!*pcerts)
448 return NULL;
449 cch = M_ASN1_new_of(CMS_CertificateChoices);
450 if (!cch)
451 return NULL;
452 if (!sk_CMS_CertificateChoices_push(*pcerts, cch))
453 {
454 M_ASN1_free_of(cch, CMS_CertificateChoices);
455 return NULL;
456 }
457 return cch;
458 }
459
460 int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert)
461 {
462 CMS_CertificateChoices *cch;
463 STACK_OF(CMS_CertificateChoices) **pcerts;
464 int i;
465 pcerts = cms_get0_certificate_choices(cms);
466 if (!pcerts)
467 return 0;
468 for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
469 {
470 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
471 if (cch->type == CMS_CERTCHOICE_CERT)
472 {
473 if (!X509_cmp(cch->d.certificate, cert))
474 {
475 CMSerr(CMS_F_CMS_ADD0_CERT,
476 CMS_R_CERTIFICATE_ALREADY_PRESENT);
477 return 0;
478 }
479 }
480 }
481 cch = CMS_add0_CertificateChoices(cms);
482 if (!cch)
483 return 0;
484 cch->type = CMS_CERTCHOICE_CERT;
485 cch->d.certificate = cert;
486 return 1;
487 }
488
489 int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert)
490 {
491 int r;
492 r = CMS_add0_cert(cms, cert);
493 if (r > 0)
494 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
495 return r;
496 }
497
498 static STACK_OF(CMS_RevocationInfoChoice) **cms_get0_revocation_choices(CMS_ContentInfo *cms)
499 {
500 switch (OBJ_obj2nid(cms->contentType))
501 {
502
503 case NID_pkcs7_signed:
504 return &cms->d.signedData->crls;
505
506 case NID_pkcs7_enveloped:
507 return &cms->d.envelopedData->originatorInfo->crls;
508
509 default:
510 CMSerr(CMS_F_CMS_GET0_REVOCATION_CHOICES,
511 CMS_R_UNSUPPORTED_CONTENT_TYPE);
512 return NULL;
513
514 }
515 }
516
517 CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms)
518 {
519 STACK_OF(CMS_RevocationInfoChoice) **pcrls;
520 CMS_RevocationInfoChoice *rch;
521 pcrls = cms_get0_revocation_choices(cms);
522 if (!pcrls)
523 return NULL;
524 if (!*pcrls)
525 *pcrls = sk_CMS_RevocationInfoChoice_new_null();
526 if (!*pcrls)
527 return NULL;
528 rch = M_ASN1_new_of(CMS_RevocationInfoChoice);
529 if (!rch)
530 return NULL;
531 if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch))
532 {
533 M_ASN1_free_of(rch, CMS_RevocationInfoChoice);
534 return NULL;
535 }
536 return rch;
537 }
538
539 int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl)
540 {
541 CMS_RevocationInfoChoice *rch;
542 rch = CMS_add0_RevocationInfoChoice(cms);
543 if (!rch)
544 return 0;
545 rch->type = CMS_REVCHOICE_CRL;
546 rch->d.crl = crl;
547 return 1;
548 }
549
550 int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl)
551 {
552 int r;
553 r = CMS_add0_crl(cms, crl);
554 if (r > 0)
555 CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
556 return r;
557 }
558
559 STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms)
560 {
561 STACK_OF(X509) *certs = NULL;
562 CMS_CertificateChoices *cch;
563 STACK_OF(CMS_CertificateChoices) **pcerts;
564 int i;
565 pcerts = cms_get0_certificate_choices(cms);
566 if (!pcerts)
567 return NULL;
568 for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
569 {
570 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
571 if (cch->type == 0)
572 {
573 if (!certs)
574 {
575 certs = sk_X509_new_null();
576 if (!certs)
577 return NULL;
578 }
579 if (!sk_X509_push(certs, cch->d.certificate))
580 {
581 sk_X509_pop_free(certs, X509_free);
582 return NULL;
583 }
584 CRYPTO_add(&cch->d.certificate->references,
585 1, CRYPTO_LOCK_X509);
586 }
587 }
588 return certs;
589
590 }
591
592 STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms)
593 {
594 STACK_OF(X509_CRL) *crls = NULL;
595 STACK_OF(CMS_RevocationInfoChoice) **pcrls;
596 CMS_RevocationInfoChoice *rch;
597 int i;
598 pcrls = cms_get0_revocation_choices(cms);
599 if (!pcrls)
600 return NULL;
601 for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++)
602 {
603 rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i);
604 if (rch->type == 0)
605 {
606 if (!crls)
607 {
608 crls = sk_X509_CRL_new_null();
609 if (!crls)
610 return NULL;
611 }
612 if (!sk_X509_CRL_push(crls, rch->d.crl))
613 {
614 sk_X509_CRL_pop_free(crls, X509_CRL_free);
615 return NULL;
616 }
617 CRYPTO_add(&rch->d.crl->references,
618 1, CRYPTO_LOCK_X509_CRL);
619 }
620 }
621 return crls;
622 }