1 /*
2 * Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 "cms_local.h"
18 #include "crypto/asn1.h"
19 #include "crypto/evp.h"
20
21 /* CMS SignedData Utilities */
22
cms_get0_signed(CMS_ContentInfo * cms)23 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
24 {
25 if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
26 CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
27 return NULL;
28 }
29 return cms->d.signedData;
30 }
31
cms_signed_data_init(CMS_ContentInfo * cms)32 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
33 {
34 if (cms->d.other == NULL) {
35 cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
36 if (!cms->d.signedData) {
37 CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
38 return NULL;
39 }
40 cms->d.signedData->version = 1;
41 cms->d.signedData->encapContentInfo->eContentType =
42 OBJ_nid2obj(NID_pkcs7_data);
43 cms->d.signedData->encapContentInfo->partial = 1;
44 ASN1_OBJECT_free(cms->contentType);
45 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
46 return cms->d.signedData;
47 }
48 return cms_get0_signed(cms);
49 }
50
51 /* Just initialise SignedData e.g. for certs only structure */
52
CMS_SignedData_init(CMS_ContentInfo * cms)53 int CMS_SignedData_init(CMS_ContentInfo *cms)
54 {
55 if (cms_signed_data_init(cms))
56 return 1;
57 else
58 return 0;
59 }
60
61 /* Check structures and fixup version numbers (if necessary) */
62
cms_sd_set_version(CMS_SignedData * sd)63 static void cms_sd_set_version(CMS_SignedData *sd)
64 {
65 int i;
66 CMS_CertificateChoices *cch;
67 CMS_RevocationInfoChoice *rch;
68 CMS_SignerInfo *si;
69
70 for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
71 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
72 if (cch->type == CMS_CERTCHOICE_OTHER) {
73 if (sd->version < 5)
74 sd->version = 5;
75 } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
76 if (sd->version < 4)
77 sd->version = 4;
78 } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
79 if (sd->version < 3)
80 sd->version = 3;
81 }
82 }
83
84 for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
85 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
86 if (rch->type == CMS_REVCHOICE_OTHER) {
87 if (sd->version < 5)
88 sd->version = 5;
89 }
90 }
91
92 if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
93 && (sd->version < 3))
94 sd->version = 3;
95
96 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
97 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
98 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
99 if (si->version < 3)
100 si->version = 3;
101 if (sd->version < 3)
102 sd->version = 3;
103 } else if (si->version < 1)
104 si->version = 1;
105 }
106
107 if (sd->version < 1)
108 sd->version = 1;
109
110 }
111
112 /*
113 * RFC 5652 Section 11.1 Content Type
114 * The content-type attribute within signed-data MUST
115 * 1) be present if there are signed attributes
116 * 2) match the content type in the signed-data,
117 * 3) be a signed attribute.
118 * 4) not have more than one copy of the attribute.
119 *
120 * Note that since the CMS_SignerInfo_sign() always adds the "signing time"
121 * attribute, the content type attribute MUST be added also.
122 * Assumptions: This assumes that the attribute does not already exist.
123 */
cms_set_si_contentType_attr(CMS_ContentInfo * cms,CMS_SignerInfo * si)124 static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
125 {
126 ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
127
128 /* Add the contentType attribute */
129 return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
130 V_ASN1_OBJECT, ctype, -1) > 0;
131 }
132
133 /* Copy an existing messageDigest value */
134
cms_copy_messageDigest(CMS_ContentInfo * cms,CMS_SignerInfo * si)135 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
136 {
137 STACK_OF(CMS_SignerInfo) *sinfos;
138 CMS_SignerInfo *sitmp;
139 int i;
140 sinfos = CMS_get0_SignerInfos(cms);
141 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
142 ASN1_OCTET_STRING *messageDigest;
143 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
144 if (sitmp == si)
145 continue;
146 if (CMS_signed_get_attr_count(sitmp) < 0)
147 continue;
148 if (OBJ_cmp(si->digestAlgorithm->algorithm,
149 sitmp->digestAlgorithm->algorithm))
150 continue;
151 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
152 OBJ_nid2obj
153 (NID_pkcs9_messageDigest),
154 -3, V_ASN1_OCTET_STRING);
155 if (!messageDigest) {
156 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
157 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
158 return 0;
159 }
160
161 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
162 V_ASN1_OCTET_STRING,
163 messageDigest, -1))
164 return 1;
165 else
166 return 0;
167 }
168 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
169 return 0;
170 }
171
cms_set1_SignerIdentifier(CMS_SignerIdentifier * sid,X509 * cert,int type)172 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
173 {
174 switch (type) {
175 case CMS_SIGNERINFO_ISSUER_SERIAL:
176 if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
177 return 0;
178 break;
179
180 case CMS_SIGNERINFO_KEYIDENTIFIER:
181 if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
182 return 0;
183 break;
184
185 default:
186 CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
187 return 0;
188 }
189
190 sid->type = type;
191
192 return 1;
193 }
194
cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier * sid,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)195 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
196 ASN1_OCTET_STRING **keyid,
197 X509_NAME **issuer,
198 ASN1_INTEGER **sno)
199 {
200 if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
201 if (issuer)
202 *issuer = sid->d.issuerAndSerialNumber->issuer;
203 if (sno)
204 *sno = sid->d.issuerAndSerialNumber->serialNumber;
205 } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
206 if (keyid)
207 *keyid = sid->d.subjectKeyIdentifier;
208 } else
209 return 0;
210 return 1;
211 }
212
cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier * sid,X509 * cert)213 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
214 {
215 if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
216 return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
217 else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
218 return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
219 else
220 return -1;
221 }
222
cms_sd_asn1_ctrl(CMS_SignerInfo * si,int cmd)223 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
224 {
225 EVP_PKEY *pkey = si->pkey;
226 int i;
227 if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
228 return 1;
229 i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
230 if (i == -2) {
231 CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
232 return 0;
233 }
234 if (i <= 0) {
235 CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
236 return 0;
237 }
238 return 1;
239 }
240
CMS_add1_signer(CMS_ContentInfo * cms,X509 * signer,EVP_PKEY * pk,const EVP_MD * md,unsigned int flags)241 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
242 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
243 unsigned int flags)
244 {
245 CMS_SignedData *sd;
246 CMS_SignerInfo *si = NULL;
247 X509_ALGOR *alg;
248 int i, type;
249 if (!X509_check_private_key(signer, pk)) {
250 CMSerr(CMS_F_CMS_ADD1_SIGNER,
251 CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
252 return NULL;
253 }
254 sd = cms_signed_data_init(cms);
255 if (!sd)
256 goto err;
257 si = M_ASN1_new_of(CMS_SignerInfo);
258 if (!si)
259 goto merr;
260 /* Call for side-effect of computing hash and caching extensions */
261 X509_check_purpose(signer, -1, -1);
262
263 X509_up_ref(signer);
264 EVP_PKEY_up_ref(pk);
265
266 si->pkey = pk;
267 si->signer = signer;
268 si->mctx = EVP_MD_CTX_new();
269 si->pctx = NULL;
270
271 if (si->mctx == NULL) {
272 CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
273 goto err;
274 }
275
276 if (flags & CMS_USE_KEYID) {
277 si->version = 3;
278 if (sd->version < 3)
279 sd->version = 3;
280 type = CMS_SIGNERINFO_KEYIDENTIFIER;
281 } else {
282 type = CMS_SIGNERINFO_ISSUER_SERIAL;
283 si->version = 1;
284 }
285
286 if (!cms_set1_SignerIdentifier(si->sid, signer, type))
287 goto err;
288
289 if (md == NULL) {
290 int def_nid;
291 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
292 goto err;
293 md = EVP_get_digestbynid(def_nid);
294 if (md == NULL) {
295 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
296 goto err;
297 }
298 }
299
300 if (!md) {
301 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
302 goto err;
303 }
304
305 X509_ALGOR_set_md(si->digestAlgorithm, md);
306
307 /* See if digest is present in digestAlgorithms */
308 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
309 const ASN1_OBJECT *aoid;
310 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
311 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
312 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
313 break;
314 }
315
316 if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
317 alg = X509_ALGOR_new();
318 if (alg == NULL)
319 goto merr;
320 X509_ALGOR_set_md(alg, md);
321 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
322 X509_ALGOR_free(alg);
323 goto merr;
324 }
325 }
326
327 if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
328 goto err;
329 if (!(flags & CMS_NOATTR)) {
330 /*
331 * Initialize signed attributes structure so other attributes
332 * such as signing time etc are added later even if we add none here.
333 */
334 if (!si->signedAttrs) {
335 si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
336 if (!si->signedAttrs)
337 goto merr;
338 }
339
340 if (!(flags & CMS_NOSMIMECAP)) {
341 STACK_OF(X509_ALGOR) *smcap = NULL;
342 i = CMS_add_standard_smimecap(&smcap);
343 if (i)
344 i = CMS_add_smimecap(si, smcap);
345 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
346 if (!i)
347 goto merr;
348 }
349 if (flags & CMS_REUSE_DIGEST) {
350 if (!cms_copy_messageDigest(cms, si))
351 goto err;
352 if (!cms_set_si_contentType_attr(cms, si))
353 goto err;
354 if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
355 !CMS_SignerInfo_sign(si))
356 goto err;
357 }
358 }
359
360 if (!(flags & CMS_NOCERTS)) {
361 /* NB ignore -1 return for duplicate cert */
362 if (!CMS_add1_cert(cms, signer))
363 goto merr;
364 }
365
366 if (flags & CMS_KEY_PARAM) {
367 if (flags & CMS_NOATTR) {
368 si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
369 if (si->pctx == NULL)
370 goto err;
371 if (EVP_PKEY_sign_init(si->pctx) <= 0)
372 goto err;
373 if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
374 goto err;
375 } else if (EVP_DigestSignInit(si->mctx, &si->pctx, md, NULL, pk) <=
376 0)
377 goto err;
378 }
379
380 if (!sd->signerInfos)
381 sd->signerInfos = sk_CMS_SignerInfo_new_null();
382 if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
383 goto merr;
384
385 return si;
386
387 merr:
388 CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
389 err:
390 M_ASN1_free_of(si, CMS_SignerInfo);
391 return NULL;
392
393 }
394
cms_add1_signingTime(CMS_SignerInfo * si,ASN1_TIME * t)395 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
396 {
397 ASN1_TIME *tt;
398 int r = 0;
399 if (t)
400 tt = t;
401 else
402 tt = X509_gmtime_adj(NULL, 0);
403
404 if (!tt)
405 goto merr;
406
407 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
408 tt->type, tt, -1) <= 0)
409 goto merr;
410
411 r = 1;
412
413 merr:
414
415 if (!t)
416 ASN1_TIME_free(tt);
417
418 if (!r)
419 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
420
421 return r;
422
423 }
424
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo * si)425 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
426 {
427 return si->pctx;
428 }
429
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo * si)430 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
431 {
432 return si->mctx;
433 }
434
STACK_OF(CMS_SignerInfo)435 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
436 {
437 CMS_SignedData *sd;
438 sd = cms_get0_signed(cms);
439 if (!sd)
440 return NULL;
441 return sd->signerInfos;
442 }
443
STACK_OF(X509)444 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
445 {
446 STACK_OF(X509) *signers = NULL;
447 STACK_OF(CMS_SignerInfo) *sinfos;
448 CMS_SignerInfo *si;
449 int i;
450 sinfos = CMS_get0_SignerInfos(cms);
451 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
452 si = sk_CMS_SignerInfo_value(sinfos, i);
453 if (si->signer) {
454 if (!signers) {
455 signers = sk_X509_new_null();
456 if (!signers)
457 return NULL;
458 }
459 if (!sk_X509_push(signers, si->signer)) {
460 sk_X509_free(signers);
461 return NULL;
462 }
463 }
464 }
465 return signers;
466 }
467
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo * si,X509 * signer)468 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
469 {
470 if (signer) {
471 X509_up_ref(signer);
472 EVP_PKEY_free(si->pkey);
473 si->pkey = X509_get_pubkey(signer);
474 }
475 X509_free(si->signer);
476 si->signer = signer;
477 }
478
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo * si,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)479 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
480 ASN1_OCTET_STRING **keyid,
481 X509_NAME **issuer, ASN1_INTEGER **sno)
482 {
483 return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
484 }
485
CMS_SignerInfo_cert_cmp(CMS_SignerInfo * si,X509 * cert)486 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
487 {
488 return cms_SignerIdentifier_cert_cmp(si->sid, cert);
489 }
490
CMS_set1_signers_certs(CMS_ContentInfo * cms,STACK_OF (X509)* scerts,unsigned int flags)491 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
492 unsigned int flags)
493 {
494 CMS_SignedData *sd;
495 CMS_SignerInfo *si;
496 CMS_CertificateChoices *cch;
497 STACK_OF(CMS_CertificateChoices) *certs;
498 X509 *x;
499 int i, j;
500 int ret = 0;
501 sd = cms_get0_signed(cms);
502 if (!sd)
503 return -1;
504 certs = sd->certificates;
505 for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
506 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
507 if (si->signer)
508 continue;
509
510 for (j = 0; j < sk_X509_num(scerts); j++) {
511 x = sk_X509_value(scerts, j);
512 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
513 CMS_SignerInfo_set1_signer_cert(si, x);
514 ret++;
515 break;
516 }
517 }
518
519 if (si->signer || (flags & CMS_NOINTERN))
520 continue;
521
522 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
523 cch = sk_CMS_CertificateChoices_value(certs, j);
524 if (cch->type != 0)
525 continue;
526 x = cch->d.certificate;
527 if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
528 CMS_SignerInfo_set1_signer_cert(si, x);
529 ret++;
530 break;
531 }
532 }
533 }
534 return ret;
535 }
536
CMS_SignerInfo_get0_algs(CMS_SignerInfo * si,EVP_PKEY ** pk,X509 ** signer,X509_ALGOR ** pdig,X509_ALGOR ** psig)537 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
538 X509 **signer, X509_ALGOR **pdig,
539 X509_ALGOR **psig)
540 {
541 if (pk)
542 *pk = si->pkey;
543 if (signer)
544 *signer = si->signer;
545 if (pdig)
546 *pdig = si->digestAlgorithm;
547 if (psig)
548 *psig = si->signatureAlgorithm;
549 }
550
CMS_SignerInfo_get0_signature(CMS_SignerInfo * si)551 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
552 {
553 return si->signature;
554 }
555
cms_SignerInfo_content_sign(CMS_ContentInfo * cms,CMS_SignerInfo * si,BIO * chain)556 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
557 CMS_SignerInfo *si, BIO *chain)
558 {
559 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
560 int r = 0;
561 EVP_PKEY_CTX *pctx = NULL;
562
563 if (mctx == NULL) {
564 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
565 return 0;
566 }
567
568 if (!si->pkey) {
569 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
570 goto err;
571 }
572
573 if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
574 goto err;
575 /* Set SignerInfo algorithm details if we used custom parameter */
576 if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
577 goto err;
578
579 /*
580 * If any signed attributes calculate and add messageDigest attribute
581 */
582
583 if (CMS_signed_get_attr_count(si) >= 0) {
584 unsigned char md[EVP_MAX_MD_SIZE];
585 unsigned int mdlen;
586 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
587 goto err;
588 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
589 V_ASN1_OCTET_STRING, md, mdlen))
590 goto err;
591 /* Copy content type across */
592 if (!cms_set_si_contentType_attr(cms, si))
593 goto err;
594
595 if (!CMS_SignerInfo_sign(si))
596 goto err;
597 } else if (si->pctx) {
598 unsigned char *sig;
599 size_t siglen;
600 unsigned char md[EVP_MAX_MD_SIZE];
601 unsigned int mdlen;
602 pctx = si->pctx;
603 if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
604 goto err;
605 siglen = EVP_PKEY_size(si->pkey);
606 sig = OPENSSL_malloc(siglen);
607 if (sig == NULL) {
608 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
609 goto err;
610 }
611 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
612 OPENSSL_free(sig);
613 goto err;
614 }
615 ASN1_STRING_set0(si->signature, sig, siglen);
616 } else {
617 unsigned char *sig;
618 unsigned int siglen;
619 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
620 if (sig == NULL) {
621 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
622 goto err;
623 }
624 if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
625 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR);
626 OPENSSL_free(sig);
627 goto err;
628 }
629 ASN1_STRING_set0(si->signature, sig, siglen);
630 }
631
632 r = 1;
633
634 err:
635 EVP_MD_CTX_free(mctx);
636 EVP_PKEY_CTX_free(pctx);
637 return r;
638
639 }
640
cms_SignedData_final(CMS_ContentInfo * cms,BIO * chain)641 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
642 {
643 STACK_OF(CMS_SignerInfo) *sinfos;
644 CMS_SignerInfo *si;
645 int i;
646 sinfos = CMS_get0_SignerInfos(cms);
647 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
648 si = sk_CMS_SignerInfo_value(sinfos, i);
649 if (!cms_SignerInfo_content_sign(cms, si, chain))
650 return 0;
651 }
652 cms->d.signedData->encapContentInfo->partial = 0;
653 return 1;
654 }
655
CMS_SignerInfo_sign(CMS_SignerInfo * si)656 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
657 {
658 EVP_MD_CTX *mctx = si->mctx;
659 EVP_PKEY_CTX *pctx = NULL;
660 unsigned char *abuf = NULL;
661 int alen;
662 size_t siglen;
663 const EVP_MD *md = NULL;
664
665 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
666 if (md == NULL)
667 return 0;
668
669 if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
670 if (!cms_add1_signingTime(si, NULL))
671 goto err;
672 }
673
674 if (!CMS_si_check_attributes(si))
675 goto err;
676
677 if (si->pctx)
678 pctx = si->pctx;
679 else {
680 EVP_MD_CTX_reset(mctx);
681 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
682 goto err;
683 si->pctx = pctx;
684 }
685
686 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
687 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
688 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
689 goto err;
690 }
691
692 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
693 ASN1_ITEM_rptr(CMS_Attributes_Sign));
694 if (!abuf)
695 goto err;
696 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
697 goto err;
698 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
699 goto err;
700 OPENSSL_free(abuf);
701 abuf = OPENSSL_malloc(siglen);
702 if (abuf == NULL)
703 goto err;
704 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
705 goto err;
706
707 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
708 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
709 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
710 goto err;
711 }
712
713 EVP_MD_CTX_reset(mctx);
714
715 ASN1_STRING_set0(si->signature, abuf, siglen);
716
717 return 1;
718
719 err:
720 OPENSSL_free(abuf);
721 EVP_MD_CTX_reset(mctx);
722 return 0;
723 }
724
CMS_SignerInfo_verify(CMS_SignerInfo * si)725 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
726 {
727 EVP_MD_CTX *mctx = NULL;
728 unsigned char *abuf = NULL;
729 int alen, r = -1;
730 const EVP_MD *md = NULL;
731
732 if (!si->pkey) {
733 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
734 return -1;
735 }
736
737 if (!CMS_si_check_attributes(si))
738 return -1;
739
740 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
741 if (md == NULL)
742 return -1;
743 if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
744 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, ERR_R_MALLOC_FAILURE);
745 return -1;
746 }
747 mctx = si->mctx;
748 if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
749 goto err;
750
751 if (!cms_sd_asn1_ctrl(si, 1))
752 goto err;
753
754 alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
755 ASN1_ITEM_rptr(CMS_Attributes_Verify));
756 if (!abuf)
757 goto err;
758 r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
759 OPENSSL_free(abuf);
760 if (r <= 0) {
761 r = -1;
762 goto err;
763 }
764 r = EVP_DigestVerifyFinal(mctx,
765 si->signature->data, si->signature->length);
766 if (r <= 0)
767 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
768 err:
769 EVP_MD_CTX_reset(mctx);
770 return r;
771 }
772
773 /* Create a chain of digest BIOs from a CMS ContentInfo */
774
cms_SignedData_init_bio(CMS_ContentInfo * cms)775 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
776 {
777 int i;
778 CMS_SignedData *sd;
779 BIO *chain = NULL;
780 sd = cms_get0_signed(cms);
781 if (!sd)
782 return NULL;
783 if (cms->d.signedData->encapContentInfo->partial)
784 cms_sd_set_version(sd);
785 for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
786 X509_ALGOR *digestAlgorithm;
787 BIO *mdbio;
788 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
789 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
790 if (!mdbio)
791 goto err;
792 if (chain)
793 BIO_push(chain, mdbio);
794 else
795 chain = mdbio;
796 }
797 return chain;
798 err:
799 BIO_free_all(chain);
800 return NULL;
801 }
802
CMS_SignerInfo_verify_content(CMS_SignerInfo * si,BIO * chain)803 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
804 {
805 ASN1_OCTET_STRING *os = NULL;
806 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
807 EVP_PKEY_CTX *pkctx = NULL;
808 int r = -1;
809 unsigned char mval[EVP_MAX_MD_SIZE];
810 unsigned int mlen;
811
812 if (mctx == NULL) {
813 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, ERR_R_MALLOC_FAILURE);
814 goto err;
815 }
816 /* If we have any signed attributes look for messageDigest value */
817 if (CMS_signed_get_attr_count(si) >= 0) {
818 os = CMS_signed_get0_data_by_OBJ(si,
819 OBJ_nid2obj(NID_pkcs9_messageDigest),
820 -3, V_ASN1_OCTET_STRING);
821 if (!os) {
822 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
823 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
824 goto err;
825 }
826 }
827
828 if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
829 goto err;
830
831 if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
832 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
833 CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
834 goto err;
835 }
836
837 /* If messageDigest found compare it */
838
839 if (os) {
840 if (mlen != (unsigned int)os->length) {
841 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
842 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
843 goto err;
844 }
845
846 if (memcmp(mval, os->data, mlen)) {
847 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
848 CMS_R_VERIFICATION_FAILURE);
849 r = 0;
850 } else
851 r = 1;
852 } else {
853 const EVP_MD *md = EVP_MD_CTX_md(mctx);
854 pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
855 if (pkctx == NULL)
856 goto err;
857 if (EVP_PKEY_verify_init(pkctx) <= 0)
858 goto err;
859 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
860 goto err;
861 si->pctx = pkctx;
862 if (!cms_sd_asn1_ctrl(si, 1))
863 goto err;
864 r = EVP_PKEY_verify(pkctx, si->signature->data,
865 si->signature->length, mval, mlen);
866 if (r <= 0) {
867 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
868 CMS_R_VERIFICATION_FAILURE);
869 r = 0;
870 }
871 }
872
873 err:
874 EVP_PKEY_CTX_free(pkctx);
875 EVP_MD_CTX_free(mctx);
876 return r;
877
878 }
879
CMS_add_smimecap(CMS_SignerInfo * si,STACK_OF (X509_ALGOR)* algs)880 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
881 {
882 unsigned char *smder = NULL;
883 int smderlen, r;
884 smderlen = i2d_X509_ALGORS(algs, &smder);
885 if (smderlen <= 0)
886 return 0;
887 r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
888 V_ASN1_SEQUENCE, smder, smderlen);
889 OPENSSL_free(smder);
890 return r;
891 }
892
CMS_add_simple_smimecap(STACK_OF (X509_ALGOR)** algs,int algnid,int keysize)893 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
894 int algnid, int keysize)
895 {
896 X509_ALGOR *alg;
897 ASN1_INTEGER *key = NULL;
898 if (keysize > 0) {
899 key = ASN1_INTEGER_new();
900 if (key == NULL || !ASN1_INTEGER_set(key, keysize)) {
901 ASN1_INTEGER_free(key);
902 return 0;
903 }
904 }
905 alg = X509_ALGOR_new();
906 if (alg == NULL) {
907 ASN1_INTEGER_free(key);
908 return 0;
909 }
910
911 X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
912 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
913 if (*algs == NULL)
914 *algs = sk_X509_ALGOR_new_null();
915 if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
916 X509_ALGOR_free(alg);
917 return 0;
918 }
919 return 1;
920 }
921
922 /* Check to see if a cipher exists and if so add S/MIME capabilities */
923
cms_add_cipher_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)924 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
925 {
926 if (EVP_get_cipherbynid(nid))
927 return CMS_add_simple_smimecap(sk, nid, arg);
928 return 1;
929 }
930
cms_add_digest_smcap(STACK_OF (X509_ALGOR)** sk,int nid,int arg)931 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
932 {
933 if (EVP_get_digestbynid(nid))
934 return CMS_add_simple_smimecap(sk, nid, arg);
935 return 1;
936 }
937
CMS_add_standard_smimecap(STACK_OF (X509_ALGOR)** smcap)938 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
939 {
940 if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
941 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
942 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
943 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
944 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
945 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
946 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
947 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
948 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
949 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
950 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
951 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
952 return 0;
953 return 1;
954 }
955