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 si->pctx = NULL;
486 goto err;
487 }
488 else {
489 EVP_MD_CTX_set_flags(si->mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
490 }
491 }
492
493 if (!sd->signerInfos)
494 sd->signerInfos = sk_CMS_SignerInfo_new_null();
495 if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
496 goto merr;
497
498 return si;
499
500 merr:
501 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
502 err:
503 M_ASN1_free_of(si, CMS_SignerInfo);
504 return NULL;
505
506 }
507
ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo * cms)508 void ossl_cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
509 {
510 int i;
511 CMS_SignerInfo *si;
512 STACK_OF(CMS_SignerInfo) *sinfos;
513 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
514
515 ERR_set_mark();
516 sinfos = CMS_get0_SignerInfos(cms);
517 ERR_pop_to_mark(); /* removes error in case sinfos == NULL */
518
519 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
520 si = sk_CMS_SignerInfo_value(sinfos, i);
521 if (si != NULL)
522 si->cms_ctx = ctx;
523 }
524 }
525
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)526 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
527 {
528 ASN1_TIME *tt;
529 int r = 0;
530
531 if (t != NULL)
532 tt = t;
533 else
534 tt = X509_gmtime_adj(NULL, 0);
535
536 if (tt == NULL)
537 goto merr;
538
539 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
540 tt->type, tt, -1) <= 0)
541 goto merr;
542
543 r = 1;
544 merr:
545 if (t == NULL)
546 ASN1_TIME_free(tt);
547
548 if (!r)
549 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
550
551 return r;
552
553 }
554
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo * si)555 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
556 {
557 return si->pctx;
558 }
559
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo * si)560 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
561 {
562 return si->mctx;
563 }
564
STACK_OF(CMS_SignerInfo)565 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
566 {
567 CMS_SignedData *sd = cms_get0_signed(cms);
568
569 return sd != NULL ? sd->signerInfos : NULL;
570 }
571
STACK_OF(X509)572 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
573 {
574 STACK_OF(X509) *signers = NULL;
575 STACK_OF(CMS_SignerInfo) *sinfos;
576 CMS_SignerInfo *si;
577 int i;
578
579 sinfos = CMS_get0_SignerInfos(cms);
580 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
581 si = sk_CMS_SignerInfo_value(sinfos, i);
582 if (si->signer != NULL) {
583 if (!ossl_x509_add_cert_new(&signers, si->signer,
584 X509_ADD_FLAG_DEFAULT)) {
585 sk_X509_free(signers);
586 return NULL;
587 }
588 }
589 }
590 return signers;
591 }
592
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)593 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
594 {
595 if (signer != NULL) {
596 X509_up_ref(signer);
597 EVP_PKEY_free(si->pkey);
598 si->pkey = X509_get_pubkey(signer);
599 }
600 X509_free(si->signer);
601 si->signer = signer;
602 }
603
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)604 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
605 ASN1_OCTET_STRING **keyid,
606 X509_NAME **issuer, ASN1_INTEGER **sno)
607 {
608 return ossl_cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
609 }
610
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)611 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
612 {
613 return ossl_cms_SignerIdentifier_cert_cmp(si->sid, cert);
614 }
615
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)616 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
617 unsigned int flags)
618 {
619 CMS_SignedData *sd;
620 CMS_SignerInfo *si;
621 CMS_CertificateChoices *cch;
622 STACK_OF(CMS_CertificateChoices) *certs;
623 X509 *x;
624 int i, j;
625 int ret = 0;
626
627 sd = cms_get0_signed(cms);
628 if (sd == NULL)
629 return -1;
630 certs = sd->certificates;
631 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
632 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
633 if (si->signer != NULL)
634 continue;
635
636 for (j = 0; j < sk_X509_num(scerts); j++) {
637 x = sk_X509_value(scerts, j);
638 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
639 CMS_SignerInfo_set1_signer_cert(si, x);
640 ret++;
641 break;
642 }
643 }
644
645 if (si->signer != NULL || (flags & CMS_NOINTERN))
646 continue;
647
648 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
649 cch = sk_CMS_CertificateChoices_value(certs, j);
650 if (cch->type != 0)
651 continue;
652 x = cch->d.certificate;
653 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
654 CMS_SignerInfo_set1_signer_cert(si, x);
655 ret++;
656 break;
657 }
658 }
659 }
660 return ret;
661 }
662
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)663 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
664 X509 **signer, X509_ALGOR **pdig,
665 X509_ALGOR **psig)
666 {
667 if (pk != NULL)
668 *pk = si->pkey;
669 if (signer != NULL)
670 *signer = si->signer;
671 if (pdig != NULL)
672 *pdig = si->digestAlgorithm;
673 if (psig != NULL)
674 *psig = si->signatureAlgorithm;
675 }
676
CMS_SignerInfo_get0_signature(CMS_SignerInfo * si)677 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
678 {
679 return si->signature;
680 }
681
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)682 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
683 CMS_SignerInfo *si, BIO *chain)
684 {
685 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
686 int r = 0;
687 EVP_PKEY_CTX *pctx = NULL;
688 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
689
690 if (mctx == NULL) {
691 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
692 return 0;
693 }
694
695 if (si->pkey == NULL) {
696 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
697 goto err;
698 }
699
700 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
701 goto err;
702 /* Set SignerInfo algorithm details if we used custom parameter */
703 if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
704 goto err;
705
706 /*
707 * If any signed attributes calculate and add messageDigest attribute
708 */
709
710 if (CMS_signed_get_attr_count(si) >= 0) {
711 unsigned char md[EVP_MAX_MD_SIZE];
712 unsigned int mdlen;
713
714 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
715 goto err;
716 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
717 V_ASN1_OCTET_STRING, md, mdlen))
718 goto err;
719 /* Copy content type across */
720 if (!cms_set_si_contentType_attr(cms, si))
721 goto err;
722
723 if (!CMS_SignerInfo_sign(si))
724 goto err;
725 } else if (si->pctx) {
726 unsigned char *sig;
727 size_t siglen;
728 unsigned char md[EVP_MAX_MD_SIZE];
729 unsigned int mdlen;
730
731 pctx = si->pctx;
732 si->pctx = NULL;
733 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
734 goto err;
735 siglen = EVP_PKEY_get_size(si->pkey);
736 sig = OPENSSL_malloc(siglen);
737 if (sig == NULL) {
738 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
739 goto err;
740 }
741 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
742 OPENSSL_free(sig);
743 goto err;
744 }
745 ASN1_STRING_set0(si->signature, sig, siglen);
746 } else {
747 unsigned char *sig;
748 unsigned int siglen;
749
750 sig = OPENSSL_malloc(EVP_PKEY_get_size(si->pkey));
751 if (sig == NULL) {
752 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
753 goto err;
754 }
755 if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey,
756 ossl_cms_ctx_get0_libctx(ctx),
757 ossl_cms_ctx_get0_propq(ctx))) {
758 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
759 OPENSSL_free(sig);
760 goto err;
761 }
762 ASN1_STRING_set0(si->signature, sig, siglen);
763 }
764
765 r = 1;
766
767 err:
768 EVP_MD_CTX_free(mctx);
769 EVP_PKEY_CTX_free(pctx);
770 return r;
771
772 }
773
ossl_cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)774 int ossl_cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
775 {
776 STACK_OF(CMS_SignerInfo) *sinfos;
777 CMS_SignerInfo *si;
778 int i;
779
780 sinfos = CMS_get0_SignerInfos(cms);
781 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
782 si = sk_CMS_SignerInfo_value(sinfos, i);
783 if (!cms_SignerInfo_content_sign(cms, si, chain))
784 return 0;
785 }
786 cms->d.signedData->encapContentInfo->partial = 0;
787 return 1;
788 }
789
CMS_SignerInfo_sign(CMS_SignerInfo * si)790 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
791 {
792 EVP_MD_CTX *mctx = si->mctx;
793 EVP_PKEY_CTX *pctx = NULL;
794 unsigned char *abuf = NULL;
795 int alen;
796 size_t siglen;
797 const CMS_CTX *ctx = si->cms_ctx;
798 char md_name[OSSL_MAX_NAME_SIZE];
799
800 if (OBJ_obj2txt(md_name, sizeof(md_name),
801 si->digestAlgorithm->algorithm, 0) <= 0)
802 return 0;
803
804 if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
805 if (!cms_add1_signingTime(si, NULL))
806 goto err;
807 }
808
809 if (!ossl_cms_si_check_attributes(si))
810 goto err;
811
812 if (si->pctx)
813 pctx = si->pctx;
814 else {
815 EVP_MD_CTX_reset(mctx);
816 if (EVP_DigestSignInit_ex(mctx, &pctx, md_name,
817 ossl_cms_ctx_get0_libctx(ctx),
818 ossl_cms_ctx_get0_propq(ctx), si->pkey,
819 NULL) <= 0)
820 goto err;
821 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
822 si->pctx = pctx;
823 }
824
825 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
826 ASN1_ITEM_rptr(CMS_Attributes_Sign));
827 if (!abuf)
828 goto err;
829 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
830 goto err;
831 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
832 goto err;
833 OPENSSL_free(abuf);
834 abuf = OPENSSL_malloc(siglen);
835 if (abuf == NULL)
836 goto err;
837 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
838 goto err;
839
840 EVP_MD_CTX_reset(mctx);
841
842 ASN1_STRING_set0(si->signature, abuf, siglen);
843
844 return 1;
845
846 err:
847 OPENSSL_free(abuf);
848 EVP_MD_CTX_reset(mctx);
849 return 0;
850 }
851
CMS_SignerInfo_verify(CMS_SignerInfo * si)852 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
853 {
854 EVP_MD_CTX *mctx = NULL;
855 unsigned char *abuf = NULL;
856 int alen, r = -1;
857 char name[OSSL_MAX_NAME_SIZE];
858 const EVP_MD *md;
859 EVP_MD *fetched_md = NULL;
860 const CMS_CTX *ctx = si->cms_ctx;
861 OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
862 const char *propq = ossl_cms_ctx_get0_propq(ctx);
863
864 if (si->pkey == NULL) {
865 ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
866 return -1;
867 }
868
869 if (!ossl_cms_si_check_attributes(si))
870 return -1;
871
872 OBJ_obj2txt(name, sizeof(name), si->digestAlgorithm->algorithm, 0);
873
874 (void)ERR_set_mark();
875 fetched_md = EVP_MD_fetch(libctx, name, propq);
876
877 if (fetched_md != NULL)
878 md = fetched_md;
879 else
880 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
881 if (md == NULL) {
882 (void)ERR_clear_last_mark();
883 ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
884 return -1;
885 }
886 (void)ERR_pop_to_mark();
887
888 if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
889 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
890 goto err;
891 }
892 mctx = si->mctx;
893 if (si->pctx != NULL) {
894 EVP_PKEY_CTX_free(si->pctx);
895 si->pctx = NULL;
896 }
897 if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_get0_name(md), libctx,
898 propq, si->pkey, NULL) <= 0) {
899 si->pctx = NULL;
900 goto err;
901 }
902 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
903
904 if (!cms_sd_asn1_ctrl(si, 1))
905 goto err;
906
907 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
908 ASN1_ITEM_rptr(CMS_Attributes_Verify));
909 if (abuf == NULL || alen < 0)
910 goto err;
911 r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
912 OPENSSL_free(abuf);
913 if (r <= 0) {
914 r = -1;
915 goto err;
916 }
917 r = EVP_DigestVerifyFinal(mctx,
918 si->signature->data, si->signature->length);
919 if (r <= 0)
920 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
921 err:
922 EVP_MD_free(fetched_md);
923 EVP_MD_CTX_reset(mctx);
924 return r;
925 }
926
927 /* Create a chain of digest BIOs from a CMS ContentInfo */
928
ossl_cms_SignedData_init_bio(CMS_ContentInfo * cms)929 BIO *ossl_cms_SignedData_init_bio(CMS_ContentInfo *cms)
930 {
931 int i;
932 CMS_SignedData *sd;
933 BIO *chain = NULL;
934
935 sd = cms_get0_signed(cms);
936 if (sd == NULL)
937 return NULL;
938 if (cms->d.signedData->encapContentInfo->partial)
939 cms_sd_set_version(sd);
940 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
941 X509_ALGOR *digestAlgorithm;
942 BIO *mdbio;
943
944 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
945 mdbio = ossl_cms_DigestAlgorithm_init_bio(digestAlgorithm,
946 ossl_cms_get0_cmsctx(cms));
947 if (mdbio == NULL)
948 goto err;
949 if (chain != NULL)
950 BIO_push(chain, mdbio);
951 else
952 chain = mdbio;
953 }
954 return chain;
955 err:
956 BIO_free_all(chain);
957 return NULL;
958 }
959
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)960 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
961 {
962 ASN1_OCTET_STRING *os = NULL;
963 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
964 EVP_PKEY_CTX *pkctx = NULL;
965 int r = -1;
966 unsigned char mval[EVP_MAX_MD_SIZE];
967 unsigned int mlen;
968
969 if (mctx == NULL) {
970 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
971 goto err;
972 }
973 /* If we have any signed attributes look for messageDigest value */
974 if (CMS_signed_get_attr_count(si) >= 0) {
975 os = CMS_signed_get0_data_by_OBJ(si,
976 OBJ_nid2obj(NID_pkcs9_messageDigest),
977 -3, V_ASN1_OCTET_STRING);
978 if (os == NULL) {
979 ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
980 goto err;
981 }
982 }
983
984 if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
985 goto err;
986
987 if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
988 ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
989 goto err;
990 }
991
992 /* If messageDigest found compare it */
993
994 if (os != NULL) {
995 if (mlen != (unsigned int)os->length) {
996 ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
997 goto err;
998 }
999
1000 if (memcmp(mval, os->data, mlen)) {
1001 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
1002 r = 0;
1003 } else
1004 r = 1;
1005 } else {
1006 const EVP_MD *md = EVP_MD_CTX_get0_md(mctx);
1007 const CMS_CTX *ctx = si->cms_ctx;
1008
1009 pkctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
1010 si->pkey,
1011 ossl_cms_ctx_get0_propq(ctx));
1012 if (pkctx == NULL)
1013 goto err;
1014 if (EVP_PKEY_verify_init(pkctx) <= 0)
1015 goto err;
1016 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
1017 goto err;
1018 si->pctx = pkctx;
1019 if (!cms_sd_asn1_ctrl(si, 1)) {
1020 si->pctx = NULL;
1021 goto err;
1022 }
1023 si->pctx = NULL;
1024 r = EVP_PKEY_verify(pkctx, si->signature->data,
1025 si->signature->length, mval, mlen);
1026 if (r <= 0) {
1027 ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
1028 r = 0;
1029 }
1030 }
1031
1032 err:
1033 EVP_PKEY_CTX_free(pkctx);
1034 EVP_MD_CTX_free(mctx);
1035 return r;
1036
1037 }
1038
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)1039 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
1040 {
1041 unsigned char *smder = NULL;
1042 int smderlen, r;
1043
1044 smderlen = i2d_X509_ALGORS(algs, &smder);
1045 if (smderlen <= 0)
1046 return 0;
1047 r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
1048 V_ASN1_SEQUENCE, smder, smderlen);
1049 OPENSSL_free(smder);
1050 return r;
1051 }
1052
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)1053 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
1054 int algnid, int keysize)
1055 {
1056 X509_ALGOR *alg = NULL;
1057 ASN1_INTEGER *key = NULL;
1058
1059 if (keysize > 0) {
1060 key = ASN1_INTEGER_new();
1061 if (key == NULL || !ASN1_INTEGER_set(key, keysize))
1062 goto err;
1063 }
1064 alg = X509_ALGOR_new();
1065 if (alg == NULL)
1066 goto err;
1067
1068 if (!X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1069 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key))
1070 goto err;
1071 key = NULL;
1072 if (*algs == NULL)
1073 *algs = sk_X509_ALGOR_new_null();
1074 if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg))
1075 goto err;
1076 return 1;
1077
1078 err:
1079 ASN1_INTEGER_free(key);
1080 X509_ALGOR_free(alg);
1081 return 0;
1082 }
1083
1084 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1085
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1086 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1087 {
1088 if (EVP_get_cipherbynid(nid))
1089 return CMS_add_simple_smimecap(sk, nid, arg);
1090 return 1;
1091 }
1092
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)1093 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1094 {
1095 if (EVP_get_digestbynid(nid))
1096 return CMS_add_simple_smimecap(sk, nid, arg);
1097 return 1;
1098 }
1099
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)1100 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1101 {
1102 if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1103 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1104 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1105 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1106 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1107 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1108 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1109 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1110 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1111 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1112 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1113 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1114 return 0;
1115 return 1;
1116 }
1117