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1 /* crypto/cms/cms_sd.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 "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 
DECLARE_ASN1_ITEM(CMS_SignedData)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 
cms_signed_data_init(CMS_ContentInfo * cms)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 
CMS_SignedData_init(CMS_ContentInfo * cms)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 
cms_sd_set_version(CMS_SignedData * sd)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 if (si->version < 1)
162 			si->version = 1;
163 		}
164 
165 	if (sd->version < 1)
166 		sd->version = 1;
167 
168 	}
169 
170 /* Copy an existing messageDigest value */
171 
cms_copy_messageDigest(CMS_ContentInfo * cms,CMS_SignerInfo * si)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 
cms_set1_SignerIdentifier(CMS_SignerIdentifier * sid,X509 * cert,int type)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 
cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier * sid,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)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 
cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier * sid,X509 * cert)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 
CMS_add1_signer(CMS_ContentInfo * cms,X509 * signer,EVP_PKEY * pk,const EVP_MD * md,unsigned int flags)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 
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)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 
STACK_OF(CMS_SignerInfo)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 
STACK_OF(X509)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 
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)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 
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)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 
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)550 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
551 	{
552 	return cms_SignerIdentifier_cert_cmp(si->sid, cert);
553 	}
554 
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)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 
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)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 
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)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 
cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)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 
CMS_SignerInfo_sign(CMS_SignerInfo * si)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 
CMS_SignerInfo_verify(CMS_SignerInfo * si)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 
cms_SignedData_init_bio(CMS_ContentInfo * cms)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 
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)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 
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)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 
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)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 
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)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 
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)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 
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)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 	}
986