1 /*
2 * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include "internal/cryptlib.h"
11 #include <openssl/asn1t.h>
12 #include <openssl/pem.h>
13 #include <openssl/x509.h>
14 #include <openssl/x509v3.h>
15 #include <openssl/err.h>
16 #include <openssl/cms.h>
17 #include <openssl/ess.h>
18 #include "internal/sizes.h"
19 #include "crypto/asn1.h"
20 #include "crypto/evp.h"
21 #include "crypto/ess.h"
22 #include "crypto/x509.h" /* for ossl_x509_add_cert_new() */
23 #include "cms_local.h"
24
25 /* CMS SignedData Utilities */
26
cms_get0_signed(CMS_ContentInfo * cms)27 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
28 {
29 if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
30 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
31 return NULL;
32 }
33 return cms->d.signedData;
34 }
35
cms_signed_data_init(CMS_ContentInfo * cms)36 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
37 {
38 if (cms->d.other == NULL) {
39 cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
40 if (!cms->d.signedData) {
41 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
42 return NULL;
43 }
44 cms->d.signedData->version = 1;
45 cms->d.signedData->encapContentInfo->eContentType =
46 OBJ_nid2obj(NID_pkcs7_data);
47 cms->d.signedData->encapContentInfo->partial = 1;
48 ASN1_OBJECT_free(cms->contentType);
49 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
50 return cms->d.signedData;
51 }
52 return cms_get0_signed(cms);
53 }
54
55 /* Just initialise SignedData e.g. for certs only structure */
56
CMS_SignedData_init(CMS_ContentInfo * cms)57 int CMS_SignedData_init(CMS_ContentInfo *cms)
58 {
59 if (cms_signed_data_init(cms))
60 return 1;
61 else
62 return 0;
63 }
64
65
66 /* Check structures and fixup version numbers (if necessary) */
67
cms_sd_set_version(CMS_SignedData * sd)68 static void cms_sd_set_version(CMS_SignedData *sd)
69 {
70 int i;
71 CMS_CertificateChoices *cch;
72 CMS_RevocationInfoChoice *rch;
73 CMS_SignerInfo *si;
74
75 for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
76 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
77 if (cch->type == CMS_CERTCHOICE_OTHER) {
78 if (sd->version < 5)
79 sd->version = 5;
80 } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
81 if (sd->version < 4)
82 sd->version = 4;
83 } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
84 if (sd->version < 3)
85 sd->version = 3;
86 }
87 }
88
89 for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
90 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
91 if (rch->type == CMS_REVCHOICE_OTHER) {
92 if (sd->version < 5)
93 sd->version = 5;
94 }
95 }
96
97 if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
98 && (sd->version < 3))
99 sd->version = 3;
100
101 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
102 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
103 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
104 if (si->version < 3)
105 si->version = 3;
106 if (sd->version < 3)
107 sd->version = 3;
108 } else if (si->version < 1)
109 si->version = 1;
110 }
111
112 if (sd->version < 1)
113 sd->version = 1;
114
115 }
116
117 /*
118 * RFC 5652 Section 11.1 Content Type
119 * The content-type attribute within signed-data MUST
120 * 1) be present if there are signed attributes
121 * 2) match the content type in the signed-data,
122 * 3) be a signed attribute.
123 * 4) not have more than one copy of the attribute.
124 *
125 * Note that since the CMS_SignerInfo_sign() always adds the "signing time"
126 * attribute, the content type attribute MUST be added also.
127 * Assumptions: This assumes that the attribute does not already exist.
128 */
cms_set_si_contentType_attr(CMS_ContentInfo * cms,CMS_SignerInfo * si)129 static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
130 {
131 ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
132
133 /* Add the contentType attribute */
134 return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
135 V_ASN1_OBJECT, ctype, -1) > 0;
136 }
137
138 /* Copy an existing messageDigest value */
139
cms_copy_messageDigest(CMS_ContentInfo * cms,CMS_SignerInfo * si)140 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
141 {
142 STACK_OF(CMS_SignerInfo) *sinfos;
143 CMS_SignerInfo *sitmp;
144 int i;
145
146 sinfos = CMS_get0_SignerInfos(cms);
147 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
148 ASN1_OCTET_STRING *messageDigest;
149
150 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
151 if (sitmp == si)
152 continue;
153 if (CMS_signed_get_attr_count(sitmp) < 0)
154 continue;
155 if (OBJ_cmp(si->digestAlgorithm->algorithm,
156 sitmp->digestAlgorithm->algorithm))
157 continue;
158 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
159 OBJ_nid2obj
160 (NID_pkcs9_messageDigest),
161 -3, V_ASN1_OCTET_STRING);
162 if (!messageDigest) {
163 ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
164 return 0;
165 }
166
167 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
168 V_ASN1_OCTET_STRING,
169 messageDigest, -1))
170 return 1;
171 else
172 return 0;
173 }
174 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_DIGEST);
175 return 0;
176 }
177
ossl_cms_set1_SignerIdentifier(CMS_SignerIdentifier * sid,X509 * cert,int type,const CMS_CTX * ctx)178 int ossl_cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert,
179 int type, const CMS_CTX *ctx)
180 {
181 switch (type) {
182 case CMS_SIGNERINFO_ISSUER_SERIAL:
183 if (!ossl_cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
184 return 0;
185 break;
186
187 case CMS_SIGNERINFO_KEYIDENTIFIER:
188 if (!ossl_cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
189 return 0;
190 break;
191
192 default:
193 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_ID);
194 return 0;
195 }
196
197 sid->type = type;
198
199 return 1;
200 }
201
ossl_cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier * sid,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)202 int ossl_cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
203 ASN1_OCTET_STRING **keyid,
204 X509_NAME **issuer,
205 ASN1_INTEGER **sno)
206 {
207 if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
208 if (issuer)
209 *issuer = sid->d.issuerAndSerialNumber->issuer;
210 if (sno)
211 *sno = sid->d.issuerAndSerialNumber->serialNumber;
212 } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
213 if (keyid)
214 *keyid = sid->d.subjectKeyIdentifier;
215 } else
216 return 0;
217 return 1;
218 }
219
ossl_cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier * sid,X509 * cert)220 int ossl_cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
221 {
222 if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
223 return ossl_cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
224 else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
225 return ossl_cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
226 else
227 return -1;
228 }
229
cms_sd_asn1_ctrl(CMS_SignerInfo * si,int cmd)230 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
231 {
232 EVP_PKEY *pkey = si->pkey;
233 int i;
234
235 if (EVP_PKEY_is_a(pkey, "DSA") || EVP_PKEY_is_a(pkey, "EC"))
236 return ossl_cms_ecdsa_dsa_sign(si, cmd);
237 else if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
238 return ossl_cms_rsa_sign(si, cmd);
239
240 /* Something else? We'll give engines etc a chance to handle this */
241 if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
242 return 1;
243 i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
244 if (i == -2) {
245 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
246 return 0;
247 }
248 if (i <= 0) {
249 ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_FAILURE);
250 return 0;
251 }
252 return 1;
253 }
254
255 /* Add SigningCertificate signed attribute to the signer info. */
ossl_cms_add1_signing_cert(CMS_SignerInfo * si,const ESS_SIGNING_CERT * sc)256 static int ossl_cms_add1_signing_cert(CMS_SignerInfo *si,
257 const ESS_SIGNING_CERT *sc)
258 {
259 ASN1_STRING *seq = NULL;
260 unsigned char *p, *pp = NULL;
261 int ret, len = i2d_ESS_SIGNING_CERT(sc, NULL);
262
263 if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
264 return 0;
265
266 p = pp;
267 i2d_ESS_SIGNING_CERT(sc, &p);
268 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
269 ASN1_STRING_free(seq);
270 OPENSSL_free(pp);
271 return 0;
272 }
273 OPENSSL_free(pp);
274 ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
275 V_ASN1_SEQUENCE, seq, -1);
276 ASN1_STRING_free(seq);
277 return ret;
278 }
279
280 /* Add SigningCertificateV2 signed attribute to the signer info. */
ossl_cms_add1_signing_cert_v2(CMS_SignerInfo * si,const ESS_SIGNING_CERT_V2 * sc)281 static int ossl_cms_add1_signing_cert_v2(CMS_SignerInfo *si,
282 const ESS_SIGNING_CERT_V2 *sc)
283 {
284 ASN1_STRING *seq = NULL;
285 unsigned char *p, *pp = NULL;
286 int ret, len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
287
288 if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
289 return 0;
290
291 p = pp;
292 i2d_ESS_SIGNING_CERT_V2(sc, &p);
293 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
294 ASN1_STRING_free(seq);
295 OPENSSL_free(pp);
296 return 0;
297 }
298 OPENSSL_free(pp);
299 ret = CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
300 V_ASN1_SEQUENCE, seq, -1);
301 ASN1_STRING_free(seq);
302 return ret;
303 }
304
CMS_add1_signer(CMS_ContentInfo * cms,X509 * signer,EVP_PKEY * pk,const EVP_MD * md,unsigned int flags)305 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
306 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
307 unsigned int flags)
308 {
309 CMS_SignedData *sd;
310 CMS_SignerInfo *si = NULL;
311 X509_ALGOR *alg;
312 int i, type;
313 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
314
315 if (!X509_check_private_key(signer, pk)) {
316 ERR_raise(ERR_LIB_CMS, CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
317 return NULL;
318 }
319 sd = cms_signed_data_init(cms);
320 if (!sd)
321 goto err;
322 si = M_ASN1_new_of(CMS_SignerInfo);
323 if (!si)
324 goto merr;
325 /* Call for side-effect of computing hash and caching extensions */
326 X509_check_purpose(signer, -1, -1);
327
328 X509_up_ref(signer);
329 EVP_PKEY_up_ref(pk);
330
331 si->cms_ctx = ctx;
332 si->pkey = pk;
333 si->signer = signer;
334 si->mctx = EVP_MD_CTX_new();
335 si->pctx = NULL;
336
337 if (si->mctx == NULL) {
338 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
339 goto err;
340 }
341
342 if (flags & CMS_USE_KEYID) {
343 si->version = 3;
344 if (sd->version < 3)
345 sd->version = 3;
346 type = CMS_SIGNERINFO_KEYIDENTIFIER;
347 } else {
348 type = CMS_SIGNERINFO_ISSUER_SERIAL;
349 si->version = 1;
350 }
351
352 if (!ossl_cms_set1_SignerIdentifier(si->sid, signer, type, ctx))
353 goto err;
354
355 if (md == NULL) {
356 int def_nid;
357 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
358 goto err;
359 md = EVP_get_digestbynid(def_nid);
360 if (md == NULL) {
361 ERR_raise(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST);
362 goto err;
363 }
364 }
365
366 if (!md) {
367 ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
368 goto err;
369 }
370
371 if (md == NULL) {
372 ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
373 goto err;
374 }
375
376 X509_ALGOR_set_md(si->digestAlgorithm, md);
377
378 /* See if digest is present in digestAlgorithms */
379 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
380 const ASN1_OBJECT *aoid;
381 char name[OSSL_MAX_NAME_SIZE];
382
383 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
384 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
385 OBJ_obj2txt(name, sizeof(name), aoid, 0);
386 if (EVP_MD_is_a(md, name))
387 break;
388 }
389
390 if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
391 alg = X509_ALGOR_new();
392 if (alg == NULL)
393 goto merr;
394 X509_ALGOR_set_md(alg, md);
395 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
396 X509_ALGOR_free(alg);
397 goto merr;
398 }
399 }
400
401 if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
402 goto err;
403 if (!(flags & CMS_NOATTR)) {
404 /*
405 * Initialize signed attributes structure so other attributes
406 * such as signing time etc are added later even if we add none here.
407 */
408 if (!si->signedAttrs) {
409 si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
410 if (!si->signedAttrs)
411 goto merr;
412 }
413
414 if (!(flags & CMS_NOSMIMECAP)) {
415 STACK_OF(X509_ALGOR) *smcap = NULL;
416 i = CMS_add_standard_smimecap(&smcap);
417 if (i)
418 i = CMS_add_smimecap(si, smcap);
419 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
420 if (!i)
421 goto merr;
422 }
423 if (flags & CMS_CADES) {
424 ESS_SIGNING_CERT *sc = NULL;
425 ESS_SIGNING_CERT_V2 *sc2 = NULL;
426 int add_sc;
427
428 if (md == NULL || EVP_MD_is_a(md, SN_sha1)) {
429 if ((sc = OSSL_ESS_signing_cert_new_init(signer,
430 NULL, 1)) == NULL)
431 goto err;
432 add_sc = ossl_cms_add1_signing_cert(si, sc);
433 ESS_SIGNING_CERT_free(sc);
434 } else {
435 if ((sc2 = OSSL_ESS_signing_cert_v2_new_init(md, signer,
436 NULL, 1)) == NULL)
437 goto err;
438 add_sc = ossl_cms_add1_signing_cert_v2(si, sc2);
439 ESS_SIGNING_CERT_V2_free(sc2);
440 }
441 if (!add_sc)
442 goto err;
443 }
444 if (flags & CMS_REUSE_DIGEST) {
445 if (!cms_copy_messageDigest(cms, si))
446 goto err;
447 if (!cms_set_si_contentType_attr(cms, si))
448 goto err;
449 if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
450 !CMS_SignerInfo_sign(si))
451 goto err;
452 }
453 }
454
455 if (!(flags & CMS_NOCERTS)) {
456 /* NB ignore -1 return for duplicate cert */
457 if (!CMS_add1_cert(cms, signer))
458 goto merr;
459 }
460
461 if (flags & CMS_KEY_PARAM) {
462 if (flags & CMS_NOATTR) {
463 si->pctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
464 si->pkey,
465 ossl_cms_ctx_get0_propq(ctx));
466 if (si->pctx == NULL)
467 goto err;
468 if (EVP_PKEY_sign_init(si->pctx) <= 0)
469 goto err;
470 if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
471 goto err;
472 } else if (EVP_DigestSignInit_ex(si->mctx, &si->pctx,
473 EVP_MD_get0_name(md),
474 ossl_cms_ctx_get0_libctx(ctx),
475 ossl_cms_ctx_get0_propq(ctx),
476 pk, NULL) <= 0) {
477 goto err;
478 }
479 }
480
481 if (!sd->signerInfos)
482 sd->signerInfos = sk_CMS_SignerInfo_new_null();
483 if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
484 goto merr;
485
486 return si;
487
488 merr:
489 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
490 err:
491 M_ASN1_free_of(si, CMS_SignerInfo);
492 return NULL;
493
494 }
495
ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo * cms)496 void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
497 {
498 int i;
499 CMS_SignerInfo *si;
500 STACK_OF(CMS_SignerInfo) *sinfos;
501 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
502
503 ERR_set_mark();
504 sinfos = CMS_get0_SignerInfos(cms);
505 ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
506
507 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
508 si = sk_CMS_SignerInfo_value(sinfos, i);
509 if (si != NULL)
510 si->cms_ctx = ctx;
511 }
512 }
513
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)514 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
515 {
516 ASN1_TIME *tt;
517 int r = 0;
518
519 if (t != NULL)
520 tt = t;
521 else
522 tt = X509_gmtime_adj(NULL, 0);
523
524 if (tt == NULL)
525 goto merr;
526
527 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
528 tt->type, tt, -1) <= 0)
529 goto merr;
530
531 r = 1;
532 merr:
533 if (t == NULL)
534 ASN1_TIME_free(tt);
535
536 if (!r)
537 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
538
539 return r;
540
541 }
542
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo * si)543 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
544 {
545 return si->pctx;
546 }
547
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo * si)548 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
549 {
550 return si->mctx;
551 }
552
STACK_OF(CMS_SignerInfo)553 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
554 {
555 CMS_SignedData *sd = cms_get0_signed(cms);
556
557 return sd != NULL ? sd->signerInfos : NULL;
558 }
559
STACK_OF(X509)560 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
561 {
562 STACK_OF(X509) *signers = NULL;
563 STACK_OF(CMS_SignerInfo) *sinfos;
564 CMS_SignerInfo *si;
565 int i;
566
567 sinfos = CMS_get0_SignerInfos(cms);
568 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
569 si = sk_CMS_SignerInfo_value(sinfos, i);
570 if (si->signer != NULL) {
571 if (!ossl_x509_add_cert_new(&signers, si->signer,
572 X509_ADD_FLAG_DEFAULT)) {
573 sk_X509_free(signers);
574 return NULL;
575 }
576 }
577 }
578 return signers;
579 }
580
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)581 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
582 {
583 if (signer != NULL) {
584 X509_up_ref(signer);
585 EVP_PKEY_free(si->pkey);
586 si->pkey = X509_get_pubkey(signer);
587 }
588 X509_free(si->signer);
589 si->signer = signer;
590 }
591
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)592 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
593 ASN1_OCTET_STRING **keyid,
594 X509_NAME **issuer, ASN1_INTEGER **sno)
595 {
596 return ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
597 }
598
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)599 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
600 {
601 return ossl_cms_SignerIdentifier_cert_cmp(si->sid, cert);
602 }
603
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)604 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
605 unsigned int flags)
606 {
607 CMS_SignedData *sd;
608 CMS_SignerInfo *si;
609 CMS_CertificateChoices *cch;
610 STACK_OF(CMS_CertificateChoices) *certs;
611 X509 *x;
612 int i, j;
613 int ret = 0;
614
615 sd = cms_get0_signed(cms);
616 if (sd == NULL)
617 return -1;
618 certs = sd->certificates;
619 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
620 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
621 if (si->signer != NULL)
622 continue;
623
624 for (j = 0; j < sk_X509_num(scerts); j++) {
625 x = sk_X509_value(scerts, j);
626 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
627 CMS_SignerInfo_set1_signer_cert(si, x);
628 ret++;
629 break;
630 }
631 }
632
633 if (si->signer != NULL || (flags & CMS_NOINTERN))
634 continue;
635
636 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
637 cch = sk_CMS_CertificateChoices_value(certs, j);
638 if (cch->type != 0)
639 continue;
640 x = cch->d.certificate;
641 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
642 CMS_SignerInfo_set1_signer_cert(si, x);
643 ret++;
644 break;
645 }
646 }
647 }
648 return ret;
649 }
650
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)651 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
652 X509 **signer, X509_ALGOR **pdig,
653 X509_ALGOR **psig)
654 {
655 if (pk != NULL)
656 *pk = si->pkey;
657 if (signer != NULL)
658 *signer = si->signer;
659 if (pdig != NULL)
660 *pdig = si->digestAlgorithm;
661 if (psig != NULL)
662 *psig = si->signatureAlgorithm;
663 }
664
CMS_SignerInfo_get0_signature(CMS_SignerInfo * si)665 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
666 {
667 return si->signature;
668 }
669
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)670 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
671 CMS_SignerInfo *si, BIO *chain)
672 {
673 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
674 int r = 0;
675 EVP_PKEY_CTX *pctx = NULL;
676 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
677
678 if (mctx == NULL) {
679 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
680 return 0;
681 }
682
683 if (si->pkey == NULL) {
684 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
685 goto err;
686 }
687
688 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
689 goto err;
690 /* Set SignerInfo algorithm details if we used custom parameter */
691 if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
692 goto err;
693
694 /*
695 * If any signed attributes calculate and add messageDigest attribute
696 */
697
698 if (CMS_signed_get_attr_count(si) >= 0) {
699 unsigned char md[EVP_MAX_MD_SIZE];
700 unsigned int mdlen;
701
702 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
703 goto err;
704 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
705 V_ASN1_OCTET_STRING, md, mdlen))
706 goto err;
707 /* Copy content type across */
708 if (!cms_set_si_contentType_attr(cms, si))
709 goto err;
710
711 if (!CMS_SignerInfo_sign(si))
712 goto err;
713 } else if (si->pctx) {
714 unsigned char *sig;
715 size_t siglen;
716 unsigned char md[EVP_MAX_MD_SIZE];
717 unsigned int mdlen;
718
719 pctx = si->pctx;
720 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
721 goto err;
722 siglen = EVP_PKEY_get_size(si->pkey);
723 sig = OPENSSL_malloc(siglen);
724 if (sig == NULL) {
725 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
726 goto err;
727 }
728 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
729 OPENSSL_free(sig);
730 goto err;
731 }
732 ASN1_STRING_set0(si->signature, sig, siglen);
733 } else {
734 unsigned char *sig;
735 unsigned int siglen;
736
737 sig = OPENSSL_malloc(EVP_PKEY_get_size(si->pkey));
738 if (sig == NULL) {
739 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
740 goto err;
741 }
742 if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
743 ossl_cms_ctx_get0_libctx(ctx),
744 ossl_cms_ctx_get0_propq(ctx))) {
745 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
746 OPENSSL_free(sig);
747 goto err;
748 }
749 ASN1_STRING_set0(si->signature, sig, siglen);
750 }
751
752 r = 1;
753
754 err:
755 EVP_MD_CTX_free(mctx);
756 EVP_PKEY_CTX_free(pctx);
757 return r;
758
759 }
760
ossl_cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)761 int ossl_cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
762 {
763 STACK_OF(CMS_SignerInfo) *sinfos;
764 CMS_SignerInfo *si;
765 int i;
766
767 sinfos = CMS_get0_SignerInfos(cms);
768 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
769 si = sk_CMS_SignerInfo_value(sinfos, i);
770 if (!cms_SignerInfo_content_sign(cms, si, chain))
771 return 0;
772 }
773 cms->d.signedData->encapContentInfo->partial = 0;
774 return 1;
775 }
776
CMS_SignerInfo_sign(CMS_SignerInfo * si)777 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
778 {
779 EVP_MD_CTX *mctx = si->mctx;
780 EVP_PKEY_CTX *pctx = NULL;
781 unsigned char *abuf = NULL;
782 int alen;
783 size_t siglen;
784 const CMS_CTX *ctx = si->cms_ctx;
785 char md_name[OSSL_MAX_NAME_SIZE];
786
787 if (OBJ_obj2txt(md_name, sizeof(md_name),
788 si->digestAlgorithm->algorithm, 0) <= 0)
789 return 0;
790
791 if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
792 if (!cms_add1_signingTime(si, NULL))
793 goto err;
794 }
795
796 if (!ossl_cms_si_check_attributes(si))
797 goto err;
798
799 if (si->pctx)
800 pctx = si->pctx;
801 else {
802 EVP_MD_CTX_reset(mctx);
803 if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
804 ossl_cms_ctx_get0_libctx(ctx),
805 ossl_cms_ctx_get0_propq(ctx), si->pkey,
806 NULL) <= 0)
807 goto err;
808 si->pctx = pctx;
809 }
810
811 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
812 ASN1_ITEM_rptr(CMS_Attributes_Sign));
813 if (!abuf)
814 goto err;
815 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
816 goto err;
817 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
818 goto err;
819 OPENSSL_free(abuf);
820 abuf = OPENSSL_malloc(siglen);
821 if (abuf == NULL)
822 goto err;
823 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
824 goto err;
825
826 EVP_MD_CTX_reset(mctx);
827
828 ASN1_STRING_set0(si->signature, abuf, siglen);
829
830 return 1;
831
832 err:
833 OPENSSL_free(abuf);
834 EVP_MD_CTX_reset(mctx);
835 return 0;
836 }
837
CMS_SignerInfo_verify(CMS_SignerInfo * si)838 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
839 {
840 EVP_MD_CTX *mctx = NULL;
841 unsigned char *abuf = NULL;
842 int alen, r = -1;
843 char name[OSSL_MAX_NAME_SIZE];
844 const EVP_MD *md;
845 EVP_MD *fetched_md = NULL;
846 const CMS_CTX *ctx = si->cms_ctx;
847 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
848 const char *propq = ossl_cms_ctx_get0_propq(ctx);
849
850 if (si->pkey == NULL) {
851 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
852 return -1;
853 }
854
855 if (!ossl_cms_si_check_attributes(si))
856 return -1;
857
858 OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
859
860 (void)ERR_set_mark();
861 fetched_md = EVP_MD_fetch(libctx, name, propq);
862
863 if (fetched_md != NULL)
864 md = fetched_md;
865 else
866 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
867 if (md == NULL) {
868 (void)ERR_clear_last_mark();
869 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
870 return -1;
871 }
872 (void)ERR_pop_to_mark();
873
874 if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
875 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
876 goto err;
877 }
878 mctx = si->mctx;
879 if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
880 propq, si->pkey, NULL) <= 0)
881 goto err;
882
883 if (!cms_sd_asn1_ctrl(si, 1))
884 goto err;
885
886 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
887 ASN1_ITEM_rptr(CMS_Attributes_Verify));
888 if (abuf == NULL || alen < 0)
889 goto err;
890 r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
891 OPENSSL_free(abuf);
892 if (r <= 0) {
893 r = -1;
894 goto err;
895 }
896 r = EVP_DigestVerifyFinal(mctx,
897 si->signature->data, si->signature->length);
898 if (r <= 0)
899 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
900 err:
901 EVP_MD_free(fetched_md);
902 EVP_MD_CTX_reset(mctx);
903 return r;
904 }
905
906 /* Create a chain of digest BIOs from a CMS ContentInfo */
907
ossl_cms_SignedData_init_bio(CMS_ContentInfo * cms)908 BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
909 {
910 int i;
911 CMS_SignedData *sd;
912 BIO *chain = NULL;
913
914 sd = cms_get0_signed(cms);
915 if (sd == NULL)
916 return NULL;
917 if (cms->d.signedData->encapContentInfo->partial)
918 cms_sd_set_version(sd);
919 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
920 X509_ALGOR *digestAlgorithm;
921 BIO *mdbio;
922
923 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
924 mdbio = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
925 ossl_cms_get0_cmsctx(cms));
926 if (mdbio == NULL)
927 goto err;
928 if (chain != NULL)
929 BIO_push(chain, mdbio);
930 else
931 chain = mdbio;
932 }
933 return chain;
934 err:
935 BIO_free_all(chain);
936 return NULL;
937 }
938
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)939 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
940 {
941 ASN1_OCTET_STRING *os = NULL;
942 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
943 EVP_PKEY_CTX *pkctx = NULL;
944 int r = -1;
945 unsigned char mval[EVP_MAX_MD_SIZE];
946 unsigned int mlen;
947
948 if (mctx == NULL) {
949 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
950 goto err;
951 }
952 /* If we have any signed attributes look for messageDigest value */
953 if (CMS_signed_get_attr_count(si) >= 0) {
954 os = CMS_signed_get0_data_by_OBJ(si,
955 OBJ_nid2obj(NID_pkcs9_messageDigest),
956 -3, V_ASN1_OCTET_STRING);
957 if (os == NULL) {
958 ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
959 goto err;
960 }
961 }
962
963 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
964 goto err;
965
966 if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
967 ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
968 goto err;
969 }
970
971 /* If messageDigest found compare it */
972
973 if (os != NULL) {
974 if (mlen != (unsigned int)os->length) {
975 ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
976 goto err;
977 }
978
979 if (memcmp(mval, os->data, mlen)) {
980 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
981 r = 0;
982 } else
983 r = 1;
984 } else {
985 const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
986 const CMS_CTX *ctx = si->cms_ctx;
987
988 pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
989 si->pkey,
990 ossl_cms_ctx_get0_propq(ctx));
991 if (pkctx == NULL)
992 goto err;
993 if (EVP_PKEY_verify_init(pkctx) <= 0)
994 goto err;
995 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
996 goto err;
997 si->pctx = pkctx;
998 if (!cms_sd_asn1_ctrl(si, 1))
999 goto err;
1000 r = EVP_PKEY_verify(pkctx, si->signature->data,
1001 si->signature->length, mval, mlen);
1002 if (r <= 0) {
1003 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
1004 r = 0;
1005 }
1006 }
1007
1008 err:
1009 EVP_PKEY_CTX_free(pkctx);
1010 EVP_MD_CTX_free(mctx);
1011 return r;
1012
1013 }
1014
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)1015 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
1016 {
1017 unsigned char *smder = NULL;
1018 int smderlen, r;
1019
1020 smderlen = i2d_X509_ALGORS(algs, &smder);
1021 if (smderlen <= 0)
1022 return 0;
1023 r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
1024 V_ASN1_SEQUENCE, smder, smderlen);
1025 OPENSSL_free(smder);
1026 return r;
1027 }
1028
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)1029 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
1030 int algnid, int keysize)
1031 {
1032 X509_ALGOR *alg;
1033 ASN1_INTEGER *key = NULL;
1034
1035 if (keysize > 0) {
1036 key = ASN1_INTEGER_new();
1037 if (key == NULL || !ASN1_INTEGER_set(key, keysize)) {
1038 ASN1_INTEGER_free(key);
1039 return 0;
1040 }
1041 }
1042 alg = X509_ALGOR_new();
1043 if (alg == NULL) {
1044 ASN1_INTEGER_free(key);
1045 return 0;
1046 }
1047
1048 X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1049 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
1050 if (*algs == NULL)
1051 *algs = sk_X509_ALGOR_new_null();
1052 if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
1053 X509_ALGOR_free(alg);
1054 return 0;
1055 }
1056 return 1;
1057 }
1058
1059 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1060
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1061 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1062 {
1063 if (EVP_get_cipherbynid(nid))
1064 return CMS_add_simple_smimecap(sk, nid, arg);
1065 return 1;
1066 }
1067
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1068 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1069 {
1070 if (EVP_get_digestbynid(nid))
1071 return CMS_add_simple_smimecap(sk, nid, arg);
1072 return 1;
1073 }
1074
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)1075 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1076 {
1077 if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1078 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1079 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1080 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1081 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1082 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1083 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1084 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1085 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1086 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1087 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1088 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1089 return 0;
1090 return 1;
1091 }
1092