2 * Copyright 1995-2020 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 "internal/cryptlib.h"
12 #include <openssl/rand.h>
13 #include <openssl/objects.h>
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
16 #include <openssl/err.h>
17 #include "pk7_local.h"
19 DEFINE_STACK_OF(PKCS7_RECIP_INFO)
20 DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
22 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
24 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
26 static int PKCS7_type_is_other(PKCS7 *p7)
30 int nid = OBJ_obj2nid(p7->type);
34 case NID_pkcs7_signed:
35 case NID_pkcs7_enveloped:
36 case NID_pkcs7_signedAndEnveloped:
37 case NID_pkcs7_digest:
38 case NID_pkcs7_encrypted:
49 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
51 if (PKCS7_type_is_data(p7))
53 if (PKCS7_type_is_other(p7) && p7->d.other
54 && (p7->d.other->type == V_ASN1_OCTET_STRING))
55 return p7->d.other->value.octet_string;
59 static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
64 EVP_MD *fetched = NULL;
67 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
68 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
72 name = OBJ_nid2sn(OBJ_obj2nid(alg->algorithm));
75 fetched = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
79 md = EVP_get_digestbyname(name);
82 (void)ERR_clear_last_mark();
83 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
86 (void)ERR_pop_to_mark();
92 else if (!BIO_push(*pbio, btmp)) {
93 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
105 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
106 unsigned char *key, int keylen)
108 EVP_PKEY_CTX *pctx = NULL;
109 EVP_PKEY *pkey = NULL;
110 unsigned char *ek = NULL;
113 const PKCS7_CTX *ctx = ri->ctx;
115 pkey = X509_get0_pubkey(ri->cert);
119 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
123 if (EVP_PKEY_encrypt_init(pctx) <= 0)
126 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
127 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
128 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
132 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
135 ek = OPENSSL_malloc(eklen);
138 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
142 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
145 ASN1_STRING_set0(ri->enc_key, ek, eklen);
151 EVP_PKEY_CTX_free(pctx);
157 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
158 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
161 EVP_PKEY_CTX *pctx = NULL;
162 unsigned char *ek = NULL;
165 const PKCS7_CTX *ctx = ri->ctx;
167 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
171 if (EVP_PKEY_decrypt_init(pctx) <= 0)
174 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
175 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
176 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
180 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
181 ri->enc_key->data, ri->enc_key->length) <= 0)
184 ek = OPENSSL_malloc(eklen);
187 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
191 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
192 ri->enc_key->data, ri->enc_key->length) <= 0
194 || (fixlen != 0 && eklen != fixlen)) {
196 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
202 OPENSSL_clear_free(*pek, *peklen);
207 EVP_PKEY_CTX_free(pctx);
214 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
217 BIO *out = NULL, *btmp = NULL;
218 X509_ALGOR *xa = NULL;
219 EVP_CIPHER *fetched_cipher = NULL;
220 const EVP_CIPHER *cipher;
221 const EVP_CIPHER *evp_cipher = NULL;
222 STACK_OF(X509_ALGOR) *md_sk = NULL;
223 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
224 X509_ALGOR *xalg = NULL;
225 PKCS7_RECIP_INFO *ri = NULL;
226 ASN1_OCTET_STRING *os = NULL;
227 const PKCS7_CTX *p7_ctx;
230 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
233 p7_ctx = pkcs7_get0_ctx(p7);
236 * The content field in the PKCS7 ContentInfo is optional, but that really
237 * only applies to inner content (precisely, detached signatures).
239 * When reading content, missing outer content is therefore treated as an
242 * When creating content, PKCS7_content_new() must be called before
243 * calling this method, so a NULL p7->d is always an error.
245 if (p7->d.ptr == NULL) {
246 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
250 i = OBJ_obj2nid(p7->type);
251 p7->state = PKCS7_S_HEADER;
254 case NID_pkcs7_signed:
255 md_sk = p7->d.sign->md_algs;
256 os = PKCS7_get_octet_string(p7->d.sign->contents);
258 case NID_pkcs7_signedAndEnveloped:
259 rsk = p7->d.signed_and_enveloped->recipientinfo;
260 md_sk = p7->d.signed_and_enveloped->md_algs;
261 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
262 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
263 if (evp_cipher == NULL) {
264 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
268 case NID_pkcs7_enveloped:
269 rsk = p7->d.enveloped->recipientinfo;
270 xalg = p7->d.enveloped->enc_data->algorithm;
271 evp_cipher = p7->d.enveloped->enc_data->cipher;
272 if (evp_cipher == NULL) {
273 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
277 case NID_pkcs7_digest:
278 xa = p7->d.digest->md;
279 os = PKCS7_get_octet_string(p7->d.digest->contents);
284 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
288 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
289 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
292 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
295 if (evp_cipher != NULL) {
296 unsigned char key[EVP_MAX_KEY_LENGTH];
297 unsigned char iv[EVP_MAX_IV_LENGTH];
301 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
302 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
305 BIO_get_cipher_ctx(btmp, &ctx);
306 keylen = EVP_CIPHER_key_length(evp_cipher);
307 ivlen = EVP_CIPHER_iv_length(evp_cipher);
308 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
310 if (RAND_bytes_ex(p7_ctx->libctx, iv, ivlen) <= 0)
313 (void)ERR_set_mark();
314 fetched_cipher = EVP_CIPHER_fetch(p7_ctx->libctx,
315 EVP_CIPHER_name(evp_cipher),
317 (void)ERR_pop_to_mark();
318 if (fetched_cipher != NULL)
319 cipher = fetched_cipher;
323 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
326 EVP_CIPHER_free(fetched_cipher);
327 fetched_cipher = NULL;
329 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
331 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
335 if (xalg->parameter == NULL) {
336 xalg->parameter = ASN1_TYPE_new();
337 if (xalg->parameter == NULL)
340 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
344 /* Lets do the pub key stuff :-) */
345 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
346 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
347 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
350 OPENSSL_cleanse(key, keylen);
360 if (PKCS7_is_detached(p7)) {
361 bio = BIO_new(BIO_s_null());
362 } else if (os && os->length > 0) {
363 bio = BIO_new_mem_buf(os->data, os->length);
365 bio = BIO_new(BIO_s_mem());
368 BIO_set_mem_eof_return(bio, 0);
380 EVP_CIPHER_free(fetched_cipher);
386 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
389 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
390 X509_get_issuer_name(pcert));
393 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
394 ri->issuer_and_serial->serial);
398 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
401 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
403 ASN1_OCTET_STRING *data_body = NULL;
404 EVP_MD *evp_md = NULL;
406 EVP_CIPHER *evp_cipher = NULL;
407 const EVP_CIPHER *cipher = NULL;
408 EVP_CIPHER_CTX *evp_ctx = NULL;
409 X509_ALGOR *enc_alg = NULL;
410 STACK_OF(X509_ALGOR) *md_sk = NULL;
411 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
412 PKCS7_RECIP_INFO *ri = NULL;
413 unsigned char *ek = NULL, *tkey = NULL;
414 int eklen = 0, tkeylen = 0;
416 const PKCS7_CTX *p7_ctx;
419 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
423 p7_ctx = pkcs7_get0_ctx(p7);
425 if (p7->d.ptr == NULL) {
426 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
430 i = OBJ_obj2nid(p7->type);
431 p7->state = PKCS7_S_HEADER;
434 case NID_pkcs7_signed:
436 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
437 * field and optional content.
438 * data_body is NULL if that structure has no (=detached) content
439 * or if the contentType is wrong (i.e., not "data").
441 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
442 if (!PKCS7_is_detached(p7) && data_body == NULL) {
443 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
444 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
447 md_sk = p7->d.sign->md_algs;
449 case NID_pkcs7_signedAndEnveloped:
450 rsk = p7->d.signed_and_enveloped->recipientinfo;
451 md_sk = p7->d.signed_and_enveloped->md_algs;
452 /* data_body is NULL if the optional EncryptedContent is missing. */
453 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
454 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
456 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
458 (void)ERR_set_mark();
459 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
460 if (evp_cipher != NULL)
463 cipher = EVP_get_cipherbyname(name);
465 if (cipher == NULL) {
466 (void)ERR_clear_last_mark();
467 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
468 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
471 (void)ERR_pop_to_mark();
473 case NID_pkcs7_enveloped:
474 rsk = p7->d.enveloped->recipientinfo;
475 enc_alg = p7->d.enveloped->enc_data->algorithm;
476 /* data_body is NULL if the optional EncryptedContent is missing. */
477 data_body = p7->d.enveloped->enc_data->enc_data;
478 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
480 (void)ERR_set_mark();
481 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
482 if (evp_cipher != NULL)
485 cipher = EVP_get_cipherbyname(name);
487 if (cipher == NULL) {
488 (void)ERR_clear_last_mark();
489 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
490 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
493 (void)ERR_pop_to_mark();
496 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
500 /* Detached content must be supplied via in_bio instead. */
501 if (data_body == NULL && in_bio == NULL) {
502 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
506 /* We will be checking the signature */
508 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
509 xa = sk_X509_ALGOR_value(md_sk, i);
510 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
511 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
515 name = OBJ_nid2sn(OBJ_obj2nid(xa->algorithm));
517 (void)ERR_set_mark();
518 evp_md = EVP_MD_fetch(p7_ctx->libctx, name, p7_ctx->propq);
522 md = EVP_get_digestbyname(name);
525 (void)ERR_clear_last_mark();
526 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
527 PKCS7_R_UNKNOWN_DIGEST_TYPE);
530 (void)ERR_pop_to_mark();
532 BIO_set_md(btmp, md);
542 if (cipher != NULL) {
543 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
544 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
549 * It was encrypted, we need to decrypt the secret key with the
554 * Find the recipientInfo which matches the passed certificate (if
559 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
560 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
561 if (!pkcs7_cmp_ri(ri, pcert))
566 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
567 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
572 /* If we haven't got a certificate try each ri in turn */
575 * Always attempt to decrypt all rinfo even after success as a
576 * defence against MMA timing attacks.
578 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
579 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
581 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
582 EVP_CIPHER_key_length(cipher)) < 0)
588 /* Only exit on fatal errors, not decrypt failure */
589 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
595 BIO_get_cipher_ctx(etmp, &evp_ctx);
596 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
598 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
600 /* Generate random key as MMA defence */
601 len = EVP_CIPHER_CTX_key_length(evp_ctx);
604 tkeylen = (size_t)len;
605 tkey = OPENSSL_malloc(tkeylen);
608 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
616 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
618 * Some S/MIME clients don't use the same key and effective key
619 * length. The key length is determined by the size of the
622 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
623 /* Use random key as MMA defence */
624 OPENSSL_clear_free(ek, eklen);
630 /* Clear errors so we don't leak information useful in MMA */
632 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
635 OPENSSL_clear_free(ek, eklen);
637 OPENSSL_clear_free(tkey, tkeylen);
646 if (in_bio != NULL) {
649 if (data_body->length > 0)
650 bio = BIO_new_mem_buf(data_body->data, data_body->length);
652 bio = BIO_new(BIO_s_mem());
655 BIO_set_mem_eof_return(bio, 0);
662 EVP_CIPHER_free(evp_cipher);
666 EVP_CIPHER_free(evp_cipher);
667 OPENSSL_clear_free(ek, eklen);
668 OPENSSL_clear_free(tkey, tkeylen);
676 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
679 bio = BIO_find_type(bio, BIO_TYPE_MD);
681 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
682 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
685 BIO_get_md_ctx(bio, pmd);
687 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
690 if (EVP_MD_CTX_type(*pmd) == nid)
697 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
699 unsigned char md_data[EVP_MAX_MD_SIZE];
702 /* Add signing time if not already present */
703 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
704 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
705 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
711 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
712 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
715 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
716 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
720 /* Now sign the attributes */
721 if (!PKCS7_SIGNER_INFO_sign(si))
727 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
732 PKCS7_SIGNER_INFO *si;
733 EVP_MD_CTX *mdc, *ctx_tmp;
734 STACK_OF(X509_ATTRIBUTE) *sk;
735 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
736 ASN1_OCTET_STRING *os = NULL;
737 const PKCS7_CTX *p7_ctx;
740 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
744 p7_ctx = pkcs7_get0_ctx(p7);
746 if (p7->d.ptr == NULL) {
747 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
751 ctx_tmp = EVP_MD_CTX_new();
752 if (ctx_tmp == NULL) {
753 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
757 i = OBJ_obj2nid(p7->type);
758 p7->state = PKCS7_S_HEADER;
764 case NID_pkcs7_signedAndEnveloped:
765 /* XXXXXXXXXXXXXXXX */
766 si_sk = p7->d.signed_and_enveloped->signer_info;
767 os = p7->d.signed_and_enveloped->enc_data->enc_data;
769 os = ASN1_OCTET_STRING_new();
771 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
774 p7->d.signed_and_enveloped->enc_data->enc_data = os;
777 case NID_pkcs7_enveloped:
778 /* XXXXXXXXXXXXXXXX */
779 os = p7->d.enveloped->enc_data->enc_data;
781 os = ASN1_OCTET_STRING_new();
783 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
786 p7->d.enveloped->enc_data->enc_data = os;
789 case NID_pkcs7_signed:
790 si_sk = p7->d.sign->signer_info;
791 os = PKCS7_get_octet_string(p7->d.sign->contents);
792 /* If detached data then the content is excluded */
793 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
794 ASN1_OCTET_STRING_free(os);
796 p7->d.sign->contents->d.data = NULL;
800 case NID_pkcs7_digest:
801 os = PKCS7_get_octet_string(p7->d.digest->contents);
802 /* If detached data then the content is excluded */
803 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
804 ASN1_OCTET_STRING_free(os);
806 p7->d.digest->contents->d.data = NULL;
811 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
816 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
817 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
818 if (si->pkey == NULL)
821 j = OBJ_obj2nid(si->digest_alg->algorithm);
825 btmp = PKCS7_find_digest(&mdc, btmp, j);
831 * We now have the EVP_MD_CTX, lets do the signing.
833 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
839 * If there are attributes, we add the digest attribute and only
840 * sign the attributes
842 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
843 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
846 unsigned char *abuf = NULL;
847 unsigned int abuflen;
848 abuflen = EVP_PKEY_size(si->pkey);
849 abuf = OPENSSL_malloc(abuflen);
853 if (!EVP_SignFinal_with_libctx(ctx_tmp, abuf, &abuflen, si->pkey,
854 p7_ctx->libctx, p7_ctx->propq)) {
856 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
859 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
862 } else if (i == NID_pkcs7_digest) {
863 unsigned char md_data[EVP_MAX_MD_SIZE];
865 if (!PKCS7_find_digest(&mdc, bio,
866 OBJ_obj2nid(p7->d.digest->md->algorithm)))
868 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
870 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
874 if (!PKCS7_is_detached(p7)) {
876 * NOTE(emilia): I think we only reach os == NULL here because detached
877 * digested data support is broken.
881 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
884 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
886 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
889 contlen = BIO_get_mem_data(btmp, &cont);
891 * Mark the BIO read only then we can use its copy of the data
892 * instead of making an extra copy.
894 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
895 BIO_set_mem_eof_return(btmp, 0);
896 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
901 EVP_MD_CTX_free(ctx_tmp);
905 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
908 EVP_PKEY_CTX *pctx = NULL;
909 unsigned char *abuf = NULL;
912 const EVP_MD *md = NULL;
913 const PKCS7_CTX *ctx = si->ctx;
915 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
919 mctx = EVP_MD_CTX_new();
921 PKCS7err(0, ERR_R_MALLOC_FAILURE);
925 if (EVP_DigestSignInit_with_libctx(mctx, &pctx,
926 EVP_MD_name(md), ctx->libctx, ctx->propq,
931 * TODO(3.0): This causes problems when providers are in use, so disabled
932 * for now. Can we get rid of this completely? AFAICT this ctrl has never
933 * been used since it was first put in. All internal implementations just
934 * return 1 and ignore this ctrl and have always done so by the looks of
935 * things. To fix this we could convert this ctrl into a param, which would
936 * require us to send all the signer info data as a set of params...but that
937 * is non-trivial and since this isn't used by anything it may be better
938 * just to remove it. The original commit that added it had this
939 * justification in CHANGES:
941 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
942 * EVP_PKEY_METHOD before and after signing via the
943 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
944 * before and/or after signing if necessary."
947 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
948 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
949 PKCS7err(0, PKCS7_R_CTRL_ERROR);
954 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
955 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
958 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
962 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
964 abuf = OPENSSL_malloc(siglen);
967 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
971 * TODO(3.0): This causes problems when providers are in use, so disabled
972 * for now. Can we get rid of this completely? AFAICT this ctrl has never
973 * been used since it was first put in. All internal implementations just
974 * return 1 and ignore this ctrl and have always done so by the looks of
975 * things. To fix this we could convert this ctrl into a param, which would
976 * require us to send all the signer info data as a set of params...but that
977 * is non-trivial and since this isn't used by anything it may be better
978 * just to remove it. The original commit that added it had this
979 * justification in CHANGES:
981 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
982 * EVP_PKEY_METHOD before and after signing via the
983 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
984 * before and/or after signing if necessary."
987 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
988 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
989 PKCS7err(0, PKCS7_R_CTRL_ERROR);
994 EVP_MD_CTX_free(mctx);
996 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
1002 EVP_MD_CTX_free(mctx);
1006 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
1007 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
1009 PKCS7_ISSUER_AND_SERIAL *ias;
1011 STACK_OF(X509) *cert;
1015 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
1019 if (p7->d.ptr == NULL) {
1020 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
1024 if (PKCS7_type_is_signed(p7)) {
1025 cert = p7->d.sign->cert;
1026 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
1027 cert = p7->d.signed_and_enveloped->cert;
1029 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1032 /* XXXXXXXXXXXXXXXXXXXXXXX */
1033 ias = si->issuer_and_serial;
1035 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
1037 /* were we able to find the cert in passed to us */
1039 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
1040 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1045 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
1046 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1049 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1050 i = X509_verify_cert(ctx);
1052 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1053 X509_STORE_CTX_cleanup(ctx);
1056 X509_STORE_CTX_cleanup(ctx);
1058 return PKCS7_signatureVerify(bio, p7, si, x509);
1063 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1066 ASN1_OCTET_STRING *os;
1067 EVP_MD_CTX *mdc_tmp, *mdc;
1069 EVP_MD *fetched_md = NULL;
1072 STACK_OF(X509_ATTRIBUTE) *sk;
1075 const PKCS7_CTX *ctx = pkcs7_get0_ctx(p7);
1077 mdc_tmp = EVP_MD_CTX_new();
1078 if (mdc_tmp == NULL) {
1079 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
1083 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1084 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1088 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1092 if ((btmp == NULL) ||
1093 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1094 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1095 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1098 BIO_get_md_ctx(btmp, &mdc);
1100 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1103 if (EVP_MD_CTX_type(mdc) == md_type)
1106 * Workaround for some broken clients that put the signature OID
1107 * instead of the digest OID in digest_alg->algorithm
1109 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1111 btmp = BIO_next(btmp);
1115 * mdc is the digest ctx that we want, unless there are attributes, in
1116 * which case the digest is the signed attributes
1118 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1122 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1123 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1124 unsigned int md_len;
1126 ASN1_OCTET_STRING *message_digest;
1128 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1130 message_digest = PKCS7_digest_from_attributes(sk);
1131 if (!message_digest) {
1132 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1133 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1136 if ((message_digest->length != (int)md_len) ||
1137 (memcmp(message_digest->data, md_dat, md_len))) {
1138 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1143 (void)ERR_set_mark();
1144 fetched_md = EVP_MD_fetch(ctx->libctx, OBJ_nid2sn(md_type), ctx->propq);
1146 if (fetched_md != NULL)
1149 md = EVP_get_digestbynid(md_type);
1151 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1152 (void)ERR_clear_last_mark();
1155 (void)ERR_pop_to_mark();
1157 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1158 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1160 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1164 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1170 os = si->enc_digest;
1171 pkey = X509_get0_pubkey(x509);
1177 i = EVP_VerifyFinal_with_libctx(mdc_tmp, os->data, os->length, pkey,
1178 ctx->libctx, ctx->propq);
1180 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1186 EVP_MD_CTX_free(mdc_tmp);
1187 EVP_MD_free(fetched_md);
1191 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1193 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1194 PKCS7_RECIP_INFO *ri;
1197 i = OBJ_obj2nid(p7->type);
1198 if (i != NID_pkcs7_signedAndEnveloped)
1200 if (p7->d.signed_and_enveloped == NULL)
1202 rsk = p7->d.signed_and_enveloped->recipientinfo;
1205 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1207 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1208 return ri->issuer_and_serial;
1211 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1213 return get_attribute(si->auth_attr, nid);
1216 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1218 return get_attribute(si->unauth_attr, nid);
1221 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1225 idx = X509at_get_attr_by_NID(sk, nid, -1);
1226 xa = X509at_get_attr(sk, idx);
1227 return X509_ATTRIBUTE_get0_type(xa, 0);
1230 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1233 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1235 return astype->value.octet_string;
1238 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1239 STACK_OF(X509_ATTRIBUTE) *sk)
1243 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1244 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1245 if (p7si->auth_attr == NULL)
1247 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1248 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1249 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1257 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1258 STACK_OF(X509_ATTRIBUTE) *sk)
1262 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1263 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1264 if (p7si->unauth_attr == NULL)
1266 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1267 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1268 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1276 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1279 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1282 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1285 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1288 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1291 X509_ATTRIBUTE *attr = NULL;
1294 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1297 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1299 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1300 X509_ATTRIBUTE_free(attr);
1306 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1307 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1308 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1309 X509_ATTRIBUTE_free(attr);
1310 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1313 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1314 X509_ATTRIBUTE_free(attr);