1 /*
2 * Copyright 2008-2023 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) > 0;
237 else if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
238 return ossl_cms_rsa_sign(si, cmd) > 0;
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
358 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0) {
359 ERR_raise_data(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST,
360 "pkey nid=%d", EVP_PKEY_get_id(pk));
361 goto err;
362 }
363 md = EVP_get_digestbynid(def_nid);
364 if (md == NULL) {
365 ERR_raise_data(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST,
366 "default md nid=%d", def_nid);
367 goto err;
368 }
369 }
370
371 if (!md) {
372 ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
373 goto err;
374 }
375
376 if (md == NULL) {
377 ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
378 goto err;
379 }
380
381 X509_ALGOR_set_md(si->digestAlgorithm, md);
382
383 /* See if digest is present in digestAlgorithms */
384 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
385 const ASN1_OBJECT *aoid;
386 char name[OSSL_MAX_NAME_SIZE];
387
388 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
389 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
390 OBJ_obj2txt(name, sizeof(name), aoid, 0);
391 if (EVP_MD_is_a(md, name))
392 break;
393 }
394
395 if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
396 alg = X509_ALGOR_new();
397 if (alg == NULL)
398 goto merr;
399 X509_ALGOR_set_md(alg, md);
400 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
401 X509_ALGOR_free(alg);
402 goto merr;
403 }
404 }
405
406 if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0)) {
407 ERR_raise_data(ERR_LIB_CMS, CMS_R_UNSUPPORTED_SIGNATURE_ALGORITHM,
408 "pkey nid=%d", EVP_PKEY_get_id(pk));
409 goto err;
410 }
411 if (!(flags & CMS_NOATTR)) {
412 /*
413 * Initialize signed attributes structure so other attributes
414 * such as signing time etc are added later even if we add none here.
415 */
416 if (!si->signedAttrs) {
417 si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
418 if (!si->signedAttrs)
419 goto merr;
420 }
421
422 if (!(flags & CMS_NOSMIMECAP)) {
423 STACK_OF(X509_ALGOR) *smcap = NULL;
424 i = CMS_add_standard_smimecap(&smcap);
425 if (i)
426 i = CMS_add_smimecap(si, smcap);
427 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
428 if (!i)
429 goto merr;
430 }
431 if (flags & CMS_CADES) {
432 ESS_SIGNING_CERT *sc = NULL;
433 ESS_SIGNING_CERT_V2 *sc2 = NULL;
434 int add_sc;
435
436 if (md == NULL || EVP_MD_is_a(md, SN_sha1)) {
437 if ((sc = OSSL_ESS_signing_cert_new_init(signer,
438 NULL, 1)) == NULL)
439 goto err;
440 add_sc = ossl_cms_add1_signing_cert(si, sc);
441 ESS_SIGNING_CERT_free(sc);
442 } else {
443 if ((sc2 = OSSL_ESS_signing_cert_v2_new_init(md, signer,
444 NULL, 1)) == NULL)
445 goto err;
446 add_sc = ossl_cms_add1_signing_cert_v2(si, sc2);
447 ESS_SIGNING_CERT_V2_free(sc2);
448 }
449 if (!add_sc)
450 goto err;
451 }
452 if (flags & CMS_REUSE_DIGEST) {
453 if (!cms_copy_messageDigest(cms, si))
454 goto err;
455 if (!cms_set_si_contentType_attr(cms, si))
456 goto err;
457 if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
458 !CMS_SignerInfo_sign(si))
459 goto err;
460 }
461 }
462
463 if (!(flags & CMS_NOCERTS)) {
464 /* NB ignore -1 return for duplicate cert */
465 if (!CMS_add1_cert(cms, signer))
466 goto merr;
467 }
468
469 if (flags & CMS_KEY_PARAM) {
470 if (flags & CMS_NOATTR) {
471 si->pctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
472 si->pkey,
473 ossl_cms_ctx_get0_propq(ctx));
474 if (si->pctx == NULL)
475 goto err;
476 if (EVP_PKEY_sign_init(si->pctx) <= 0)
477 goto err;
478 if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
479 goto err;
480 } else if (EVP_DigestSignInit_ex(si->mctx, &si->pctx,
481 EVP_MD_get0_name(md),
482 ossl_cms_ctx_get0_libctx(ctx),
483 ossl_cms_ctx_get0_propq(ctx),
484 pk, NULL) <= 0) {
485 goto err;
486 }
487 }
488
489 if (!sd->signerInfos)
490 sd->signerInfos = sk_CMS_SignerInfo_new_null();
491 if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
492 goto merr;
493
494 return si;
495
496 merr:
497 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
498 err:
499 M_ASN1_free_of(si, CMS_SignerInfo);
500 return NULL;
501
502 }
503
ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo * cms)504 void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
505 {
506 int i;
507 CMS_SignerInfo *si;
508 STACK_OF(CMS_SignerInfo) *sinfos;
509 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
510
511 ERR_set_mark();
512 sinfos = CMS_get0_SignerInfos(cms);
513 ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
514
515 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
516 si = sk_CMS_SignerInfo_value(sinfos, i);
517 if (si != NULL)
518 si->cms_ctx = ctx;
519 }
520 }
521
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)522 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
523 {
524 ASN1_TIME *tt;
525 int r = 0;
526
527 if (t != NULL)
528 tt = t;
529 else
530 tt = X509_gmtime_adj(NULL, 0);
531
532 if (tt == NULL)
533 goto merr;
534
535 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
536 tt->type, tt, -1) <= 0)
537 goto merr;
538
539 r = 1;
540 merr:
541 if (t == NULL)
542 ASN1_TIME_free(tt);
543
544 if (!r)
545 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
546
547 return r;
548
549 }
550
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo * si)551 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
552 {
553 return si->pctx;
554 }
555
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo * si)556 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
557 {
558 return si->mctx;
559 }
560
STACK_OF(CMS_SignerInfo)561 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
562 {
563 CMS_SignedData *sd = cms_get0_signed(cms);
564
565 return sd != NULL ? sd->signerInfos : NULL;
566 }
567
STACK_OF(X509)568 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
569 {
570 STACK_OF(X509) *signers = NULL;
571 STACK_OF(CMS_SignerInfo) *sinfos;
572 CMS_SignerInfo *si;
573 int i;
574
575 sinfos = CMS_get0_SignerInfos(cms);
576 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
577 si = sk_CMS_SignerInfo_value(sinfos, i);
578 if (si->signer != NULL) {
579 if (!ossl_x509_add_cert_new(&signers, si->signer,
580 X509_ADD_FLAG_DEFAULT)) {
581 sk_X509_free(signers);
582 return NULL;
583 }
584 }
585 }
586 return signers;
587 }
588
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)589 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
590 {
591 if (signer != NULL) {
592 X509_up_ref(signer);
593 EVP_PKEY_free(si->pkey);
594 si->pkey = X509_get_pubkey(signer);
595 }
596 X509_free(si->signer);
597 si->signer = signer;
598 }
599
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)600 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
601 ASN1_OCTET_STRING **keyid,
602 X509_NAME **issuer, ASN1_INTEGER **sno)
603 {
604 return ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
605 }
606
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)607 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
608 {
609 return ossl_cms_SignerIdentifier_cert_cmp(si->sid, cert);
610 }
611
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)612 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
613 unsigned int flags)
614 {
615 CMS_SignedData *sd;
616 CMS_SignerInfo *si;
617 CMS_CertificateChoices *cch;
618 STACK_OF(CMS_CertificateChoices) *certs;
619 X509 *x;
620 int i, j;
621 int ret = 0;
622
623 sd = cms_get0_signed(cms);
624 if (sd == NULL)
625 return -1;
626 certs = sd->certificates;
627 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
628 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
629 if (si->signer != NULL)
630 continue;
631
632 for (j = 0; j < sk_X509_num(scerts); j++) {
633 x = sk_X509_value(scerts, j);
634 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
635 CMS_SignerInfo_set1_signer_cert(si, x);
636 ret++;
637 break;
638 }
639 }
640
641 if (si->signer != NULL || (flags & CMS_NOINTERN))
642 continue;
643
644 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
645 cch = sk_CMS_CertificateChoices_value(certs, j);
646 if (cch->type != 0)
647 continue;
648 x = cch->d.certificate;
649 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
650 CMS_SignerInfo_set1_signer_cert(si, x);
651 ret++;
652 break;
653 }
654 }
655 }
656 return ret;
657 }
658
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)659 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
660 X509 **signer, X509_ALGOR **pdig,
661 X509_ALGOR **psig)
662 {
663 if (pk != NULL)
664 *pk = si->pkey;
665 if (signer != NULL)
666 *signer = si->signer;
667 if (pdig != NULL)
668 *pdig = si->digestAlgorithm;
669 if (psig != NULL)
670 *psig = si->signatureAlgorithm;
671 }
672
CMS_SignerInfo_get0_signature(CMS_SignerInfo * si)673 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
674 {
675 return si->signature;
676 }
677
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)678 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
679 CMS_SignerInfo *si, BIO *chain)
680 {
681 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
682 int r = 0;
683 EVP_PKEY_CTX *pctx = NULL;
684 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
685
686 if (mctx == NULL) {
687 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
688 return 0;
689 }
690
691 if (si->pkey == NULL) {
692 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
693 goto err;
694 }
695
696 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
697 goto err;
698 /* Set SignerInfo algorithm details if we used custom parameter */
699 if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
700 goto err;
701
702 /*
703 * If any signed attributes calculate and add messageDigest attribute
704 */
705
706 if (CMS_signed_get_attr_count(si) >= 0) {
707 unsigned char md[EVP_MAX_MD_SIZE];
708 unsigned int mdlen;
709
710 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
711 goto err;
712 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
713 V_ASN1_OCTET_STRING, md, mdlen))
714 goto err;
715 /* Copy content type across */
716 if (!cms_set_si_contentType_attr(cms, si))
717 goto err;
718
719 if (!CMS_SignerInfo_sign(si))
720 goto err;
721 } else if (si->pctx) {
722 unsigned char *sig;
723 size_t siglen;
724 unsigned char md[EVP_MAX_MD_SIZE];
725 unsigned int mdlen;
726
727 pctx = si->pctx;
728 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
729 goto err;
730 siglen = EVP_PKEY_get_size(si->pkey);
731 sig = OPENSSL_malloc(siglen);
732 if (sig == NULL) {
733 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
734 goto err;
735 }
736 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
737 OPENSSL_free(sig);
738 goto err;
739 }
740 ASN1_STRING_set0(si->signature, sig, siglen);
741 } else {
742 unsigned char *sig;
743 unsigned int siglen;
744
745 sig = OPENSSL_malloc(EVP_PKEY_get_size(si->pkey));
746 if (sig == NULL) {
747 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
748 goto err;
749 }
750 if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
751 ossl_cms_ctx_get0_libctx(ctx),
752 ossl_cms_ctx_get0_propq(ctx))) {
753 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
754 OPENSSL_free(sig);
755 goto err;
756 }
757 ASN1_STRING_set0(si->signature, sig, siglen);
758 }
759
760 r = 1;
761
762 err:
763 EVP_MD_CTX_free(mctx);
764 EVP_PKEY_CTX_free(pctx);
765 return r;
766
767 }
768
ossl_cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)769 int ossl_cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
770 {
771 STACK_OF(CMS_SignerInfo) *sinfos;
772 CMS_SignerInfo *si;
773 int i;
774
775 sinfos = CMS_get0_SignerInfos(cms);
776 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
777 si = sk_CMS_SignerInfo_value(sinfos, i);
778 if (!cms_SignerInfo_content_sign(cms, si, chain))
779 return 0;
780 }
781 cms->d.signedData->encapContentInfo->partial = 0;
782 return 1;
783 }
784
CMS_SignerInfo_sign(CMS_SignerInfo * si)785 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
786 {
787 EVP_MD_CTX *mctx = si->mctx;
788 EVP_PKEY_CTX *pctx = NULL;
789 unsigned char *abuf = NULL;
790 int alen;
791 size_t siglen;
792 const CMS_CTX *ctx = si->cms_ctx;
793 char md_name[OSSL_MAX_NAME_SIZE];
794
795 if (OBJ_obj2txt(md_name, sizeof(md_name),
796 si->digestAlgorithm->algorithm, 0) <= 0)
797 return 0;
798
799 if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
800 if (!cms_add1_signingTime(si, NULL))
801 goto err;
802 }
803
804 if (!ossl_cms_si_check_attributes(si))
805 goto err;
806
807 if (si->pctx)
808 pctx = si->pctx;
809 else {
810 EVP_MD_CTX_reset(mctx);
811 if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
812 ossl_cms_ctx_get0_libctx(ctx),
813 ossl_cms_ctx_get0_propq(ctx), si->pkey,
814 NULL) <= 0)
815 goto err;
816 si->pctx = pctx;
817 }
818
819 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
820 ASN1_ITEM_rptr(CMS_Attributes_Sign));
821 if (!abuf)
822 goto err;
823 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
824 goto err;
825 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
826 goto err;
827 OPENSSL_free(abuf);
828 abuf = OPENSSL_malloc(siglen);
829 if (abuf == NULL)
830 goto err;
831 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
832 goto err;
833
834 EVP_MD_CTX_reset(mctx);
835
836 ASN1_STRING_set0(si->signature, abuf, siglen);
837
838 return 1;
839
840 err:
841 OPENSSL_free(abuf);
842 EVP_MD_CTX_reset(mctx);
843 return 0;
844 }
845
CMS_SignerInfo_verify(CMS_SignerInfo * si)846 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
847 {
848 EVP_MD_CTX *mctx = NULL;
849 unsigned char *abuf = NULL;
850 int alen, r = -1;
851 char name[OSSL_MAX_NAME_SIZE];
852 const EVP_MD *md;
853 EVP_MD *fetched_md = NULL;
854 const CMS_CTX *ctx = si->cms_ctx;
855 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
856 const char *propq = ossl_cms_ctx_get0_propq(ctx);
857
858 if (si->pkey == NULL) {
859 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
860 return -1;
861 }
862
863 if (!ossl_cms_si_check_attributes(si))
864 return -1;
865
866 OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
867
868 (void)ERR_set_mark();
869 fetched_md = EVP_MD_fetch(libctx, name, propq);
870
871 if (fetched_md != NULL)
872 md = fetched_md;
873 else
874 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
875 if (md == NULL) {
876 (void)ERR_clear_last_mark();
877 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
878 return -1;
879 }
880 (void)ERR_pop_to_mark();
881
882 if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
883 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
884 goto err;
885 }
886 mctx = si->mctx;
887 if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
888 propq, si->pkey, NULL) <= 0)
889 goto err;
890
891 if (!cms_sd_asn1_ctrl(si, 1))
892 goto err;
893
894 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
895 ASN1_ITEM_rptr(CMS_Attributes_Verify));
896 if (abuf == NULL || alen < 0)
897 goto err;
898 r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
899 OPENSSL_free(abuf);
900 if (r <= 0) {
901 r = -1;
902 goto err;
903 }
904 r = EVP_DigestVerifyFinal(mctx,
905 si->signature->data, si->signature->length);
906 if (r <= 0)
907 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
908 err:
909 EVP_MD_free(fetched_md);
910 EVP_MD_CTX_reset(mctx);
911 return r;
912 }
913
914 /* Create a chain of digest BIOs from a CMS ContentInfo */
915
ossl_cms_SignedData_init_bio(CMS_ContentInfo * cms)916 BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
917 {
918 int i;
919 CMS_SignedData *sd;
920 BIO *chain = NULL;
921
922 sd = cms_get0_signed(cms);
923 if (sd == NULL)
924 return NULL;
925 if (cms->d.signedData->encapContentInfo->partial)
926 cms_sd_set_version(sd);
927 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
928 X509_ALGOR *digestAlgorithm;
929 BIO *mdbio;
930
931 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
932 mdbio = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
933 ossl_cms_get0_cmsctx(cms));
934 if (mdbio == NULL)
935 goto err;
936 if (chain != NULL)
937 BIO_push(chain, mdbio);
938 else
939 chain = mdbio;
940 }
941 return chain;
942 err:
943 BIO_free_all(chain);
944 return NULL;
945 }
946
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)947 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
948 {
949 ASN1_OCTET_STRING *os = NULL;
950 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
951 EVP_PKEY_CTX *pkctx = NULL;
952 int r = -1;
953 unsigned char mval[EVP_MAX_MD_SIZE];
954 unsigned int mlen;
955
956 if (mctx == NULL) {
957 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
958 goto err;
959 }
960 /* If we have any signed attributes look for messageDigest value */
961 if (CMS_signed_get_attr_count(si) >= 0) {
962 os = CMS_signed_get0_data_by_OBJ(si,
963 OBJ_nid2obj(NID_pkcs9_messageDigest),
964 -3, V_ASN1_OCTET_STRING);
965 if (os == NULL) {
966 ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
967 goto err;
968 }
969 }
970
971 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
972 goto err;
973
974 if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
975 ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
976 goto err;
977 }
978
979 /* If messageDigest found compare it */
980
981 if (os != NULL) {
982 if (mlen != (unsigned int)os->length) {
983 ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
984 goto err;
985 }
986
987 if (memcmp(mval, os->data, mlen)) {
988 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
989 r = 0;
990 } else
991 r = 1;
992 } else {
993 const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
994 const CMS_CTX *ctx = si->cms_ctx;
995
996 pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
997 si->pkey,
998 ossl_cms_ctx_get0_propq(ctx));
999 if (pkctx == NULL)
1000 goto err;
1001 if (EVP_PKEY_verify_init(pkctx) <= 0)
1002 goto err;
1003 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
1004 goto err;
1005 si->pctx = pkctx;
1006 if (!cms_sd_asn1_ctrl(si, 1))
1007 goto err;
1008 r = EVP_PKEY_verify(pkctx, si->signature->data,
1009 si->signature->length, mval, mlen);
1010 if (r <= 0) {
1011 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
1012 r = 0;
1013 }
1014 }
1015
1016 err:
1017 EVP_PKEY_CTX_free(pkctx);
1018 EVP_MD_CTX_free(mctx);
1019 return r;
1020
1021 }
1022
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)1023 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
1024 {
1025 unsigned char *smder = NULL;
1026 int smderlen, r;
1027
1028 smderlen = i2d_X509_ALGORS(algs, &smder);
1029 if (smderlen <= 0)
1030 return 0;
1031 r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
1032 V_ASN1_SEQUENCE, smder, smderlen);
1033 OPENSSL_free(smder);
1034 return r;
1035 }
1036
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)1037 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
1038 int algnid, int keysize)
1039 {
1040 X509_ALGOR *alg = NULL;
1041 ASN1_INTEGER *key = NULL;
1042
1043 if (keysize > 0) {
1044 key = ASN1_INTEGER_new();
1045 if (key == NULL || !ASN1_INTEGER_set(key, keysize))
1046 goto err;
1047 }
1048 alg = X509_ALGOR_new();
1049 if (alg == NULL)
1050 goto err;
1051
1052 if (!X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1053 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key))
1054 goto err;
1055 key = NULL;
1056 if (*algs == NULL)
1057 *algs = sk_X509_ALGOR_new_null();
1058 if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg))
1059 goto err;
1060 return 1;
1061
1062 err:
1063 ASN1_INTEGER_free(key);
1064 X509_ALGOR_free(alg);
1065 return 0;
1066 }
1067
1068 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1069
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1070 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1071 {
1072 if (EVP_get_cipherbynid(nid))
1073 return CMS_add_simple_smimecap(sk, nid, arg);
1074 return 1;
1075 }
1076
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1077 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1078 {
1079 if (EVP_get_digestbynid(nid))
1080 return CMS_add_simple_smimecap(sk, nid, arg);
1081 return 1;
1082 }
1083
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)1084 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1085 {
1086 if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1087 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1088 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1089 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1090 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1091 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1092 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1093 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1094 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1095 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1096 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1097 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1098 return 0;
1099 return 1;
1100 }
1101