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 si->pctx = NULL;
478 goto err;
479 }
480 else {
481 EVP_MD_CTX_set_flags(si->mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
482 }
483 }
484
485 if (!sd->signerInfos)
486 sd->signerInfos = sk_CMS_SignerInfo_new_null();
487 if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
488 goto merr;
489
490 return si;
491
492 merr:
493 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
494 err:
495 M_ASN1_free_of(si, CMS_SignerInfo);
496 return NULL;
497
498 }
499
ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo * cms)500 void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
501 {
502 int i;
503 CMS_SignerInfo *si;
504 STACK_OF(CMS_SignerInfo) *sinfos;
505 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
506
507 ERR_set_mark();
508 sinfos = CMS_get0_SignerInfos(cms);
509 ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
510
511 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
512 si = sk_CMS_SignerInfo_value(sinfos, i);
513 if (si != NULL)
514 si->cms_ctx = ctx;
515 }
516 }
517
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)518 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
519 {
520 ASN1_TIME *tt;
521 int r = 0;
522
523 if (t != NULL)
524 tt = t;
525 else
526 tt = X509_gmtime_adj(NULL, 0);
527
528 if (tt == NULL)
529 goto merr;
530
531 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
532 tt->type, tt, -1) <= 0)
533 goto merr;
534
535 r = 1;
536 merr:
537 if (t == NULL)
538 ASN1_TIME_free(tt);
539
540 if (!r)
541 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
542
543 return r;
544
545 }
546
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo * si)547 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
548 {
549 return si->pctx;
550 }
551
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo * si)552 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
553 {
554 return si->mctx;
555 }
556
STACK_OF(CMS_SignerInfo)557 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
558 {
559 CMS_SignedData *sd = cms_get0_signed(cms);
560
561 return sd != NULL ? sd->signerInfos : NULL;
562 }
563
STACK_OF(X509)564 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
565 {
566 STACK_OF(X509) *signers = NULL;
567 STACK_OF(CMS_SignerInfo) *sinfos;
568 CMS_SignerInfo *si;
569 int i;
570
571 sinfos = CMS_get0_SignerInfos(cms);
572 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
573 si = sk_CMS_SignerInfo_value(sinfos, i);
574 if (si->signer != NULL) {
575 if (!ossl_x509_add_cert_new(&signers, si->signer,
576 X509_ADD_FLAG_DEFAULT)) {
577 sk_X509_free(signers);
578 return NULL;
579 }
580 }
581 }
582 return signers;
583 }
584
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)585 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
586 {
587 if (signer != NULL) {
588 X509_up_ref(signer);
589 EVP_PKEY_free(si->pkey);
590 si->pkey = X509_get_pubkey(signer);
591 }
592 X509_free(si->signer);
593 si->signer = signer;
594 }
595
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)596 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
597 ASN1_OCTET_STRING **keyid,
598 X509_NAME **issuer, ASN1_INTEGER **sno)
599 {
600 return ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
601 }
602
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)603 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
604 {
605 return ossl_cms_SignerIdentifier_cert_cmp(si->sid, cert);
606 }
607
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)608 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
609 unsigned int flags)
610 {
611 CMS_SignedData *sd;
612 CMS_SignerInfo *si;
613 CMS_CertificateChoices *cch;
614 STACK_OF(CMS_CertificateChoices) *certs;
615 X509 *x;
616 int i, j;
617 int ret = 0;
618
619 sd = cms_get0_signed(cms);
620 if (sd == NULL)
621 return -1;
622 certs = sd->certificates;
623 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
624 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
625 if (si->signer != NULL)
626 continue;
627
628 for (j = 0; j < sk_X509_num(scerts); j++) {
629 x = sk_X509_value(scerts, j);
630 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
631 CMS_SignerInfo_set1_signer_cert(si, x);
632 ret++;
633 break;
634 }
635 }
636
637 if (si->signer != NULL || (flags & CMS_NOINTERN))
638 continue;
639
640 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
641 cch = sk_CMS_CertificateChoices_value(certs, j);
642 if (cch->type != 0)
643 continue;
644 x = cch->d.certificate;
645 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
646 CMS_SignerInfo_set1_signer_cert(si, x);
647 ret++;
648 break;
649 }
650 }
651 }
652 return ret;
653 }
654
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)655 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
656 X509 **signer, X509_ALGOR **pdig,
657 X509_ALGOR **psig)
658 {
659 if (pk != NULL)
660 *pk = si->pkey;
661 if (signer != NULL)
662 *signer = si->signer;
663 if (pdig != NULL)
664 *pdig = si->digestAlgorithm;
665 if (psig != NULL)
666 *psig = si->signatureAlgorithm;
667 }
668
CMS_SignerInfo_get0_signature(CMS_SignerInfo * si)669 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
670 {
671 return si->signature;
672 }
673
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)674 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
675 CMS_SignerInfo *si, BIO *chain)
676 {
677 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
678 int r = 0;
679 EVP_PKEY_CTX *pctx = NULL;
680 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
681
682 if (mctx == NULL) {
683 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
684 return 0;
685 }
686
687 if (si->pkey == NULL) {
688 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
689 goto err;
690 }
691
692 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
693 goto err;
694 /* Set SignerInfo algorithm details if we used custom parameter */
695 if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
696 goto err;
697
698 /*
699 * If any signed attributes calculate and add messageDigest attribute
700 */
701
702 if (CMS_signed_get_attr_count(si) >= 0) {
703 unsigned char md[EVP_MAX_MD_SIZE];
704 unsigned int mdlen;
705
706 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
707 goto err;
708 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
709 V_ASN1_OCTET_STRING, md, mdlen))
710 goto err;
711 /* Copy content type across */
712 if (!cms_set_si_contentType_attr(cms, si))
713 goto err;
714
715 if (!CMS_SignerInfo_sign(si))
716 goto err;
717 } else if (si->pctx) {
718 unsigned char *sig;
719 size_t siglen;
720 unsigned char md[EVP_MAX_MD_SIZE];
721 unsigned int mdlen;
722
723 pctx = si->pctx;
724 si->pctx = NULL;
725 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
726 goto err;
727 siglen = EVP_PKEY_get_size(si->pkey);
728 sig = OPENSSL_malloc(siglen);
729 if (sig == NULL) {
730 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
731 goto err;
732 }
733 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
734 OPENSSL_free(sig);
735 goto err;
736 }
737 ASN1_STRING_set0(si->signature, sig, siglen);
738 } else {
739 unsigned char *sig;
740 unsigned int siglen;
741
742 sig = OPENSSL_malloc(EVP_PKEY_get_size(si->pkey));
743 if (sig == NULL) {
744 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
745 goto err;
746 }
747 if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
748 ossl_cms_ctx_get0_libctx(ctx),
749 ossl_cms_ctx_get0_propq(ctx))) {
750 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
751 OPENSSL_free(sig);
752 goto err;
753 }
754 ASN1_STRING_set0(si->signature, sig, siglen);
755 }
756
757 r = 1;
758
759 err:
760 EVP_MD_CTX_free(mctx);
761 EVP_PKEY_CTX_free(pctx);
762 return r;
763
764 }
765
ossl_cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)766 int ossl_cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
767 {
768 STACK_OF(CMS_SignerInfo) *sinfos;
769 CMS_SignerInfo *si;
770 int i;
771
772 sinfos = CMS_get0_SignerInfos(cms);
773 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
774 si = sk_CMS_SignerInfo_value(sinfos, i);
775 if (!cms_SignerInfo_content_sign(cms, si, chain))
776 return 0;
777 }
778 cms->d.signedData->encapContentInfo->partial = 0;
779 return 1;
780 }
781
CMS_SignerInfo_sign(CMS_SignerInfo * si)782 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
783 {
784 EVP_MD_CTX *mctx = si->mctx;
785 EVP_PKEY_CTX *pctx = NULL;
786 unsigned char *abuf = NULL;
787 int alen;
788 size_t siglen;
789 const CMS_CTX *ctx = si->cms_ctx;
790 char md_name[OSSL_MAX_NAME_SIZE];
791
792 if (OBJ_obj2txt(md_name, sizeof(md_name),
793 si->digestAlgorithm->algorithm, 0) <= 0)
794 return 0;
795
796 if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
797 if (!cms_add1_signingTime(si, NULL))
798 goto err;
799 }
800
801 if (!ossl_cms_si_check_attributes(si))
802 goto err;
803
804 if (si->pctx)
805 pctx = si->pctx;
806 else {
807 EVP_MD_CTX_reset(mctx);
808 if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
809 ossl_cms_ctx_get0_libctx(ctx),
810 ossl_cms_ctx_get0_propq(ctx), si->pkey,
811 NULL) <= 0)
812 goto err;
813 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
814 si->pctx = pctx;
815 }
816
817 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
818 ASN1_ITEM_rptr(CMS_Attributes_Sign));
819 if (!abuf)
820 goto err;
821 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
822 goto err;
823 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
824 goto err;
825 OPENSSL_free(abuf);
826 abuf = OPENSSL_malloc(siglen);
827 if (abuf == NULL)
828 goto err;
829 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
830 goto err;
831
832 EVP_MD_CTX_reset(mctx);
833
834 ASN1_STRING_set0(si->signature, abuf, siglen);
835
836 return 1;
837
838 err:
839 OPENSSL_free(abuf);
840 EVP_MD_CTX_reset(mctx);
841 return 0;
842 }
843
CMS_SignerInfo_verify(CMS_SignerInfo * si)844 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
845 {
846 EVP_MD_CTX *mctx = NULL;
847 unsigned char *abuf = NULL;
848 int alen, r = -1;
849 char name[OSSL_MAX_NAME_SIZE];
850 const EVP_MD *md;
851 EVP_MD *fetched_md = NULL;
852 const CMS_CTX *ctx = si->cms_ctx;
853 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
854 const char *propq = ossl_cms_ctx_get0_propq(ctx);
855
856 if (si->pkey == NULL) {
857 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
858 return -1;
859 }
860
861 if (!ossl_cms_si_check_attributes(si))
862 return -1;
863
864 OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
865
866 (void)ERR_set_mark();
867 fetched_md = EVP_MD_fetch(libctx, name, propq);
868
869 if (fetched_md != NULL)
870 md = fetched_md;
871 else
872 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
873 if (md == NULL) {
874 (void)ERR_clear_last_mark();
875 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
876 return -1;
877 }
878 (void)ERR_pop_to_mark();
879
880 if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
881 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
882 goto err;
883 }
884 mctx = si->mctx;
885 if (si->pctx != NULL) {
886 EVP_PKEY_CTX_free(si->pctx);
887 si->pctx = NULL;
888 }
889 if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
890 propq, si->pkey, NULL) <= 0) {
891 si->pctx = NULL;
892 goto err;
893 }
894 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
895
896 if (!cms_sd_asn1_ctrl(si, 1))
897 goto err;
898
899 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
900 ASN1_ITEM_rptr(CMS_Attributes_Verify));
901 if (abuf == NULL || alen < 0)
902 goto err;
903 r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
904 OPENSSL_free(abuf);
905 if (r <= 0) {
906 r = -1;
907 goto err;
908 }
909 r = EVP_DigestVerifyFinal(mctx,
910 si->signature->data, si->signature->length);
911 if (r <= 0)
912 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
913 err:
914 EVP_MD_free(fetched_md);
915 EVP_MD_CTX_reset(mctx);
916 return r;
917 }
918
919 /* Create a chain of digest BIOs from a CMS ContentInfo */
920
ossl_cms_SignedData_init_bio(CMS_ContentInfo * cms)921 BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
922 {
923 int i;
924 CMS_SignedData *sd;
925 BIO *chain = NULL;
926
927 sd = cms_get0_signed(cms);
928 if (sd == NULL)
929 return NULL;
930 if (cms->d.signedData->encapContentInfo->partial)
931 cms_sd_set_version(sd);
932 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
933 X509_ALGOR *digestAlgorithm;
934 BIO *mdbio;
935
936 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
937 mdbio = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
938 ossl_cms_get0_cmsctx(cms));
939 if (mdbio == NULL)
940 goto err;
941 if (chain != NULL)
942 BIO_push(chain, mdbio);
943 else
944 chain = mdbio;
945 }
946 return chain;
947 err:
948 BIO_free_all(chain);
949 return NULL;
950 }
951
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)952 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
953 {
954 ASN1_OCTET_STRING *os = NULL;
955 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
956 EVP_PKEY_CTX *pkctx = NULL;
957 int r = -1;
958 unsigned char mval[EVP_MAX_MD_SIZE];
959 unsigned int mlen;
960
961 if (mctx == NULL) {
962 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
963 goto err;
964 }
965 /* If we have any signed attributes look for messageDigest value */
966 if (CMS_signed_get_attr_count(si) >= 0) {
967 os = CMS_signed_get0_data_by_OBJ(si,
968 OBJ_nid2obj(NID_pkcs9_messageDigest),
969 -3, V_ASN1_OCTET_STRING);
970 if (os == NULL) {
971 ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
972 goto err;
973 }
974 }
975
976 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
977 goto err;
978
979 if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
980 ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
981 goto err;
982 }
983
984 /* If messageDigest found compare it */
985
986 if (os != NULL) {
987 if (mlen != (unsigned int)os->length) {
988 ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
989 goto err;
990 }
991
992 if (memcmp(mval, os->data, mlen)) {
993 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
994 r = 0;
995 } else
996 r = 1;
997 } else {
998 const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
999 const CMS_CTX *ctx = si->cms_ctx;
1000
1001 pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
1002 si->pkey,
1003 ossl_cms_ctx_get0_propq(ctx));
1004 if (pkctx == NULL)
1005 goto err;
1006 if (EVP_PKEY_verify_init(pkctx) <= 0)
1007 goto err;
1008 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
1009 goto err;
1010 si->pctx = pkctx;
1011 if (!cms_sd_asn1_ctrl(si, 1)) {
1012 si->pctx = NULL;
1013 goto err;
1014 }
1015 si->pctx = NULL;
1016 r = EVP_PKEY_verify(pkctx, si->signature->data,
1017 si->signature->length, mval, mlen);
1018 if (r <= 0) {
1019 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
1020 r = 0;
1021 }
1022 }
1023
1024 err:
1025 EVP_PKEY_CTX_free(pkctx);
1026 EVP_MD_CTX_free(mctx);
1027 return r;
1028
1029 }
1030
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)1031 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
1032 {
1033 unsigned char *smder = NULL;
1034 int smderlen, r;
1035
1036 smderlen = i2d_X509_ALGORS(algs, &smder);
1037 if (smderlen <= 0)
1038 return 0;
1039 r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
1040 V_ASN1_SEQUENCE, smder, smderlen);
1041 OPENSSL_free(smder);
1042 return r;
1043 }
1044
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)1045 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
1046 int algnid, int keysize)
1047 {
1048 X509_ALGOR *alg = NULL;
1049 ASN1_INTEGER *key = NULL;
1050
1051 if (keysize > 0) {
1052 key = ASN1_INTEGER_new();
1053 if (key == NULL || !ASN1_INTEGER_set(key, keysize))
1054 goto err;
1055 }
1056 alg = X509_ALGOR_new();
1057 if (alg == NULL)
1058 goto err;
1059
1060 if (!X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1061 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key))
1062 goto err;
1063 key = NULL;
1064 if (*algs == NULL)
1065 *algs = sk_X509_ALGOR_new_null();
1066 if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg))
1067 goto err;
1068 return 1;
1069
1070 err:
1071 ASN1_INTEGER_free(key);
1072 X509_ALGOR_free(alg);
1073 return 0;
1074 }
1075
1076 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1077
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1078 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1079 {
1080 if (EVP_get_cipherbynid(nid))
1081 return CMS_add_simple_smimecap(sk, nid, arg);
1082 return 1;
1083 }
1084
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1085 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1086 {
1087 if (EVP_get_digestbynid(nid))
1088 return CMS_add_simple_smimecap(sk, nid, arg);
1089 return 1;
1090 }
1091
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)1092 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1093 {
1094 if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1095 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1096 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1097 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1098 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1099 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1100 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1101 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1102 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1103 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1104 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1105 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1106 return 0;
1107 return 1;
1108 }
1109