2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include <openssl/rand.h>
12 #include <openssl/objects.h>
13 #include <openssl/x509.h>
14 #include <openssl/x509v3.h>
15 #include <openssl/err.h>
16 #include "internal/cryptlib.h"
17 #include "internal/sizes.h"
18 #include "pk7_local.h"
20 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
22 static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid);
24 int PKCS7_type_is_other(PKCS7 *p7)
28 int nid = OBJ_obj2nid(p7->type);
32 case NID_pkcs7_signed:
33 case NID_pkcs7_enveloped:
34 case NID_pkcs7_signedAndEnveloped:
35 case NID_pkcs7_digest:
36 case NID_pkcs7_encrypted:
47 ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
49 if (PKCS7_type_is_data(p7))
51 if (PKCS7_type_is_other(p7) && p7->d.other
52 && (p7->d.other->type == V_ASN1_OCTET_STRING))
53 return p7->d.other->value.octet_string;
57 static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
61 char name[OSSL_MAX_NAME_SIZE];
62 EVP_MD *fetched = NULL;
65 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
66 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
70 OBJ_obj2txt(name, sizeof(name), alg->algorithm, 0);
73 fetched = EVP_MD_fetch(ossl_pkcs7_ctx_get0_libctx(ctx), name,
74 ossl_pkcs7_ctx_get0_propq(ctx));
78 md = EVP_get_digestbyname(name);
81 (void)ERR_clear_last_mark();
82 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
85 (void)ERR_pop_to_mark();
91 else if (!BIO_push(*pbio, btmp)) {
92 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
104 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
105 unsigned char *key, int keylen)
107 EVP_PKEY_CTX *pctx = NULL;
108 EVP_PKEY *pkey = NULL;
109 unsigned char *ek = NULL;
112 const PKCS7_CTX *ctx = ri->ctx;
114 pkey = X509_get0_pubkey(ri->cert);
118 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
119 ossl_pkcs7_ctx_get0_propq(ctx));
123 if (EVP_PKEY_encrypt_init(pctx) <= 0)
126 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
129 ek = OPENSSL_malloc(eklen);
132 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
136 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
139 ASN1_STRING_set0(ri->enc_key, ek, eklen);
145 EVP_PKEY_CTX_free(pctx);
151 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
152 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
155 EVP_PKEY_CTX *pctx = NULL;
156 unsigned char *ek = NULL;
159 const PKCS7_CTX *ctx = ri->ctx;
161 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
162 ossl_pkcs7_ctx_get0_propq(ctx));
166 if (EVP_PKEY_decrypt_init(pctx) <= 0)
169 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
170 ri->enc_key->data, ri->enc_key->length) <= 0)
173 ek = OPENSSL_malloc(eklen);
176 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
180 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
181 ri->enc_key->data, ri->enc_key->length) <= 0
183 || (fixlen != 0 && eklen != fixlen)) {
185 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
191 OPENSSL_clear_free(*pek, *peklen);
196 EVP_PKEY_CTX_free(pctx);
203 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
206 BIO *out = NULL, *btmp = NULL;
207 X509_ALGOR *xa = NULL;
208 EVP_CIPHER *fetched_cipher = NULL;
209 const EVP_CIPHER *cipher;
210 const EVP_CIPHER *evp_cipher = NULL;
211 STACK_OF(X509_ALGOR) *md_sk = NULL;
212 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
213 X509_ALGOR *xalg = NULL;
214 PKCS7_RECIP_INFO *ri = NULL;
215 ASN1_OCTET_STRING *os = NULL;
216 const PKCS7_CTX *p7_ctx;
217 OSSL_LIB_CTX *libctx;
221 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
224 p7_ctx = ossl_pkcs7_get0_ctx(p7);
225 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
226 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
229 * The content field in the PKCS7 ContentInfo is optional, but that really
230 * only applies to inner content (precisely, detached signatures).
232 * When reading content, missing outer content is therefore treated as an
235 * When creating content, PKCS7_content_new() must be called before
236 * calling this method, so a NULL p7->d is always an error.
238 if (p7->d.ptr == NULL) {
239 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
243 i = OBJ_obj2nid(p7->type);
244 p7->state = PKCS7_S_HEADER;
247 case NID_pkcs7_signed:
248 md_sk = p7->d.sign->md_algs;
249 os = PKCS7_get_octet_string(p7->d.sign->contents);
251 case NID_pkcs7_signedAndEnveloped:
252 rsk = p7->d.signed_and_enveloped->recipientinfo;
253 md_sk = p7->d.signed_and_enveloped->md_algs;
254 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
255 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
256 if (evp_cipher == NULL) {
257 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
261 case NID_pkcs7_enveloped:
262 rsk = p7->d.enveloped->recipientinfo;
263 xalg = p7->d.enveloped->enc_data->algorithm;
264 evp_cipher = p7->d.enveloped->enc_data->cipher;
265 if (evp_cipher == NULL) {
266 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
270 case NID_pkcs7_digest:
271 xa = p7->d.digest->md;
272 os = PKCS7_get_octet_string(p7->d.digest->contents);
277 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
281 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
282 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
285 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
288 if (evp_cipher != NULL) {
289 unsigned char key[EVP_MAX_KEY_LENGTH];
290 unsigned char iv[EVP_MAX_IV_LENGTH];
294 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
295 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
298 BIO_get_cipher_ctx(btmp, &ctx);
299 keylen = EVP_CIPHER_key_length(evp_cipher);
300 ivlen = EVP_CIPHER_iv_length(evp_cipher);
301 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
303 if (RAND_bytes_ex(libctx, iv, ivlen) <= 0)
306 (void)ERR_set_mark();
307 fetched_cipher = EVP_CIPHER_fetch(libctx,
308 EVP_CIPHER_name(evp_cipher),
310 (void)ERR_pop_to_mark();
311 if (fetched_cipher != NULL)
312 cipher = fetched_cipher;
316 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
319 EVP_CIPHER_free(fetched_cipher);
320 fetched_cipher = NULL;
322 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
324 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
328 if (xalg->parameter == NULL) {
329 xalg->parameter = ASN1_TYPE_new();
330 if (xalg->parameter == NULL)
333 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
337 /* Lets do the pub key stuff :-) */
338 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
339 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
340 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
343 OPENSSL_cleanse(key, keylen);
353 if (PKCS7_is_detached(p7)) {
354 bio = BIO_new(BIO_s_null());
355 } else if (os && os->length > 0) {
356 bio = BIO_new_mem_buf(os->data, os->length);
358 bio = BIO_new(BIO_s_mem());
361 BIO_set_mem_eof_return(bio, 0);
373 EVP_CIPHER_free(fetched_cipher);
379 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
382 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
383 X509_get_issuer_name(pcert));
386 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
387 ri->issuer_and_serial->serial);
391 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
394 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
396 ASN1_OCTET_STRING *data_body = NULL;
397 EVP_MD *evp_md = NULL;
399 EVP_CIPHER *evp_cipher = NULL;
400 const EVP_CIPHER *cipher = NULL;
401 EVP_CIPHER_CTX *evp_ctx = NULL;
402 X509_ALGOR *enc_alg = NULL;
403 STACK_OF(X509_ALGOR) *md_sk = NULL;
404 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
405 PKCS7_RECIP_INFO *ri = NULL;
406 unsigned char *ek = NULL, *tkey = NULL;
407 int eklen = 0, tkeylen = 0;
408 char name[OSSL_MAX_NAME_SIZE];
409 const PKCS7_CTX *p7_ctx;
410 OSSL_LIB_CTX *libctx;
414 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
418 p7_ctx = ossl_pkcs7_get0_ctx(p7);
419 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
420 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
422 if (p7->d.ptr == NULL) {
423 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
427 i = OBJ_obj2nid(p7->type);
428 p7->state = PKCS7_S_HEADER;
431 case NID_pkcs7_signed:
433 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
434 * field and optional content.
435 * data_body is NULL if that structure has no (=detached) content
436 * or if the contentType is wrong (i.e., not "data").
438 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
439 if (!PKCS7_is_detached(p7) && data_body == NULL) {
440 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_SIGNED_DATA_TYPE);
443 md_sk = p7->d.sign->md_algs;
445 case NID_pkcs7_signedAndEnveloped:
446 rsk = p7->d.signed_and_enveloped->recipientinfo;
447 md_sk = p7->d.signed_and_enveloped->md_algs;
448 /* data_body is NULL if the optional EncryptedContent is missing. */
449 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
450 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
452 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
454 (void)ERR_set_mark();
455 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
456 if (evp_cipher != NULL)
459 cipher = EVP_get_cipherbyname(name);
461 if (cipher == NULL) {
462 (void)ERR_clear_last_mark();
463 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
466 (void)ERR_pop_to_mark();
468 case NID_pkcs7_enveloped:
469 rsk = p7->d.enveloped->recipientinfo;
470 enc_alg = p7->d.enveloped->enc_data->algorithm;
471 /* data_body is NULL if the optional EncryptedContent is missing. */
472 data_body = p7->d.enveloped->enc_data->enc_data;
473 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
475 (void)ERR_set_mark();
476 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
477 if (evp_cipher != NULL)
480 cipher = EVP_get_cipherbyname(name);
482 if (cipher == NULL) {
483 (void)ERR_clear_last_mark();
484 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
487 (void)ERR_pop_to_mark();
490 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
494 /* Detached content must be supplied via in_bio instead. */
495 if (data_body == NULL && in_bio == NULL) {
496 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
500 /* We will be checking the signature */
502 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
503 xa = sk_X509_ALGOR_value(md_sk, i);
504 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
505 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
509 OBJ_obj2txt(name, sizeof(name), xa->algorithm, 0);
511 (void)ERR_set_mark();
512 evp_md = EVP_MD_fetch(libctx, name, propq);
516 md = EVP_get_digestbyname(name);
519 (void)ERR_clear_last_mark();
520 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
523 (void)ERR_pop_to_mark();
525 BIO_set_md(btmp, md);
535 if (cipher != NULL) {
536 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
537 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
542 * It was encrypted, we need to decrypt the secret key with the
547 * Find the recipientInfo which matches the passed certificate (if
552 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
553 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
554 if (!pkcs7_cmp_ri(ri, pcert))
559 ERR_raise(ERR_LIB_PKCS7,
560 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
565 /* If we haven't got a certificate try each ri in turn */
568 * Always attempt to decrypt all rinfo even after success as a
569 * defence against MMA timing attacks.
571 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
572 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
574 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
575 EVP_CIPHER_key_length(cipher)) < 0)
581 /* Only exit on fatal errors, not decrypt failure */
582 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
588 BIO_get_cipher_ctx(etmp, &evp_ctx);
589 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
591 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
593 /* Generate random key as MMA defence */
594 len = EVP_CIPHER_CTX_key_length(evp_ctx);
597 tkeylen = (size_t)len;
598 tkey = OPENSSL_malloc(tkeylen);
601 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
609 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
611 * Some S/MIME clients don't use the same key and effective key
612 * length. The key length is determined by the size of the
615 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
616 /* Use random key as MMA defence */
617 OPENSSL_clear_free(ek, eklen);
623 /* Clear errors so we don't leak information useful in MMA */
625 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
628 OPENSSL_clear_free(ek, eklen);
630 OPENSSL_clear_free(tkey, tkeylen);
639 if (in_bio != NULL) {
642 if (data_body->length > 0)
643 bio = BIO_new_mem_buf(data_body->data, data_body->length);
645 bio = BIO_new(BIO_s_mem());
648 BIO_set_mem_eof_return(bio, 0);
655 EVP_CIPHER_free(evp_cipher);
659 EVP_CIPHER_free(evp_cipher);
660 OPENSSL_clear_free(ek, eklen);
661 OPENSSL_clear_free(tkey, tkeylen);
669 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
672 bio = BIO_find_type(bio, BIO_TYPE_MD);
674 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
677 BIO_get_md_ctx(bio, pmd);
679 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
682 if (EVP_MD_CTX_type(*pmd) == nid)
689 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
691 unsigned char md_data[EVP_MAX_MD_SIZE];
694 /* Add signing time if not already present */
695 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
696 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
697 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
703 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
704 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
707 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
708 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
712 /* Now sign the attributes */
713 if (!PKCS7_SIGNER_INFO_sign(si))
719 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
724 PKCS7_SIGNER_INFO *si;
725 EVP_MD_CTX *mdc, *ctx_tmp;
726 STACK_OF(X509_ATTRIBUTE) *sk;
727 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
728 ASN1_OCTET_STRING *os = NULL;
729 const PKCS7_CTX *p7_ctx;
732 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
736 p7_ctx = ossl_pkcs7_get0_ctx(p7);
738 if (p7->d.ptr == NULL) {
739 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
743 ctx_tmp = EVP_MD_CTX_new();
744 if (ctx_tmp == NULL) {
745 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
749 i = OBJ_obj2nid(p7->type);
750 p7->state = PKCS7_S_HEADER;
756 case NID_pkcs7_signedAndEnveloped:
757 /* XXXXXXXXXXXXXXXX */
758 si_sk = p7->d.signed_and_enveloped->signer_info;
759 os = p7->d.signed_and_enveloped->enc_data->enc_data;
761 os = ASN1_OCTET_STRING_new();
763 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
766 p7->d.signed_and_enveloped->enc_data->enc_data = os;
769 case NID_pkcs7_enveloped:
770 /* XXXXXXXXXXXXXXXX */
771 os = p7->d.enveloped->enc_data->enc_data;
773 os = ASN1_OCTET_STRING_new();
775 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
778 p7->d.enveloped->enc_data->enc_data = os;
781 case NID_pkcs7_signed:
782 si_sk = p7->d.sign->signer_info;
783 os = PKCS7_get_octet_string(p7->d.sign->contents);
784 /* If detached data then the content is excluded */
785 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
786 ASN1_OCTET_STRING_free(os);
788 p7->d.sign->contents->d.data = NULL;
792 case NID_pkcs7_digest:
793 os = PKCS7_get_octet_string(p7->d.digest->contents);
794 /* If detached data then the content is excluded */
795 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
796 ASN1_OCTET_STRING_free(os);
798 p7->d.digest->contents->d.data = NULL;
803 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
808 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
809 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
810 if (si->pkey == NULL)
813 j = OBJ_obj2nid(si->digest_alg->algorithm);
817 btmp = PKCS7_find_digest(&mdc, btmp, j);
823 * We now have the EVP_MD_CTX, lets do the signing.
825 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
831 * If there are attributes, we add the digest attribute and only
832 * sign the attributes
834 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
835 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
838 unsigned char *abuf = NULL;
839 unsigned int abuflen;
840 abuflen = EVP_PKEY_size(si->pkey);
841 abuf = OPENSSL_malloc(abuflen);
845 if (!EVP_SignFinal_ex(ctx_tmp, abuf, &abuflen, si->pkey,
846 ossl_pkcs7_ctx_get0_libctx(p7_ctx),
847 ossl_pkcs7_ctx_get0_propq(p7_ctx))) {
849 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
852 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
855 } else if (i == NID_pkcs7_digest) {
856 unsigned char md_data[EVP_MAX_MD_SIZE];
858 if (!PKCS7_find_digest(&mdc, bio,
859 OBJ_obj2nid(p7->d.digest->md->algorithm)))
861 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
863 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
867 if (!PKCS7_is_detached(p7)) {
869 * NOTE(emilia): I think we only reach os == NULL here because detached
870 * digested data support is broken.
874 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
877 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
879 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
882 contlen = BIO_get_mem_data(btmp, &cont);
884 * Mark the BIO read only then we can use its copy of the data
885 * instead of making an extra copy.
887 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
888 BIO_set_mem_eof_return(btmp, 0);
889 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
894 EVP_MD_CTX_free(ctx_tmp);
898 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
901 EVP_PKEY_CTX *pctx = NULL;
902 unsigned char *abuf = NULL;
905 const EVP_MD *md = NULL;
906 const PKCS7_CTX *ctx = si->ctx;
908 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
912 mctx = EVP_MD_CTX_new();
914 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
918 if (EVP_DigestSignInit_ex(mctx, &pctx, EVP_MD_name(md),
919 ossl_pkcs7_ctx_get0_libctx(ctx),
920 ossl_pkcs7_ctx_get0_propq(ctx), si->pkey,
924 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
925 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
928 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
932 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
934 abuf = OPENSSL_malloc(siglen);
937 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
940 EVP_MD_CTX_free(mctx);
942 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
948 EVP_MD_CTX_free(mctx);
952 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
953 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
955 PKCS7_ISSUER_AND_SERIAL *ias;
957 STACK_OF(X509) *cert;
961 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
965 if (p7->d.ptr == NULL) {
966 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
970 if (PKCS7_type_is_signed(p7)) {
971 cert = p7->d.sign->cert;
972 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
973 cert = p7->d.signed_and_enveloped->cert;
975 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
978 /* XXXXXXXXXXXXXXXXXXXXXXX */
979 ias = si->issuer_and_serial;
981 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
983 /* were we able to find the cert in passed to us */
985 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
990 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
991 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
994 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
995 i = X509_verify_cert(ctx);
997 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1001 return PKCS7_signatureVerify(bio, p7, si, x509);
1006 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1009 ASN1_OCTET_STRING *os;
1010 EVP_MD_CTX *mdc_tmp, *mdc;
1012 EVP_MD *fetched_md = NULL;
1015 STACK_OF(X509_ATTRIBUTE) *sk;
1018 const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
1019 OSSL_LIB_CTX *libctx = ossl_pkcs7_ctx_get0_libctx(ctx);
1020 const char *propq = ossl_pkcs7_ctx_get0_propq(ctx);
1022 mdc_tmp = EVP_MD_CTX_new();
1023 if (mdc_tmp == NULL) {
1024 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
1028 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1029 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1033 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1037 if ((btmp == NULL) ||
1038 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1039 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1042 BIO_get_md_ctx(btmp, &mdc);
1044 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
1047 if (EVP_MD_CTX_type(mdc) == md_type)
1050 * Workaround for some broken clients that put the signature OID
1051 * instead of the digest OID in digest_alg->algorithm
1053 if (EVP_MD_pkey_type(EVP_MD_CTX_get0_md(mdc)) == md_type)
1055 btmp = BIO_next(btmp);
1059 * mdc is the digest ctx that we want, unless there are attributes, in
1060 * which case the digest is the signed attributes
1062 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1066 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1067 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1068 unsigned int md_len;
1070 ASN1_OCTET_STRING *message_digest;
1072 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1074 message_digest = PKCS7_digest_from_attributes(sk);
1075 if (!message_digest) {
1076 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1079 if ((message_digest->length != (int)md_len) ||
1080 (memcmp(message_digest->data, md_dat, md_len))) {
1081 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DIGEST_FAILURE);
1086 (void)ERR_set_mark();
1087 fetched_md = EVP_MD_fetch(libctx, OBJ_nid2sn(md_type), propq);
1089 if (fetched_md != NULL)
1092 md = EVP_get_digestbynid(md_type);
1094 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1095 (void)ERR_clear_last_mark();
1098 (void)ERR_pop_to_mark();
1100 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1101 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1103 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
1107 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1113 os = si->enc_digest;
1114 pkey = X509_get0_pubkey(x509);
1120 i = EVP_VerifyFinal_ex(mdc_tmp, os->data, os->length, pkey, libctx, propq);
1122 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
1128 EVP_MD_CTX_free(mdc_tmp);
1129 EVP_MD_free(fetched_md);
1133 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1135 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1136 PKCS7_RECIP_INFO *ri;
1139 i = OBJ_obj2nid(p7->type);
1140 if (i != NID_pkcs7_signedAndEnveloped)
1142 if (p7->d.signed_and_enveloped == NULL)
1144 rsk = p7->d.signed_and_enveloped->recipientinfo;
1147 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1149 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1150 return ri->issuer_and_serial;
1153 ASN1_TYPE *PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1155 return get_attribute(si->auth_attr, nid);
1158 ASN1_TYPE *PKCS7_get_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1160 return get_attribute(si->unauth_attr, nid);
1163 static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1167 idx = X509at_get_attr_by_NID(sk, nid, -1);
1168 xa = X509at_get_attr(sk, idx);
1169 return X509_ATTRIBUTE_get0_type(xa, 0);
1172 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1175 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1177 return astype->value.octet_string;
1180 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1181 STACK_OF(X509_ATTRIBUTE) *sk)
1185 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1186 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1187 if (p7si->auth_attr == NULL)
1189 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1190 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1191 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1199 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1200 STACK_OF(X509_ATTRIBUTE) *sk)
1204 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1205 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1206 if (p7si->unauth_attr == NULL)
1208 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1209 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1210 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1218 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1221 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1224 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1227 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1230 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1233 X509_ATTRIBUTE *attr = NULL;
1236 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1239 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1241 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1242 X509_ATTRIBUTE_free(attr);
1248 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1249 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1250 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1251 X509_ATTRIBUTE_free(attr);
1252 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1255 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1256 X509_ATTRIBUTE_free(attr);