2 * Copyright 1995-2018 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>
18 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
20 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
22 static int PKCS7_type_is_other(PKCS7 *p7)
26 int nid = OBJ_obj2nid(p7->type);
30 case NID_pkcs7_signed:
31 case NID_pkcs7_enveloped:
32 case NID_pkcs7_signedAndEnveloped:
33 case NID_pkcs7_digest:
34 case NID_pkcs7_encrypted:
45 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
47 if (PKCS7_type_is_data(p7))
49 if (PKCS7_type_is_other(p7) && p7->d.other
50 && (p7->d.other->type == V_ASN1_OCTET_STRING))
51 return p7->d.other->value.octet_string;
55 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
59 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
60 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
64 md = EVP_get_digestbyobj(alg->algorithm);
66 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
73 else if (!BIO_push(*pbio, btmp)) {
74 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
87 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
88 unsigned char *key, int keylen)
90 EVP_PKEY_CTX *pctx = NULL;
91 EVP_PKEY *pkey = NULL;
92 unsigned char *ek = NULL;
96 pkey = X509_get0_pubkey(ri->cert);
101 pctx = EVP_PKEY_CTX_new(pkey, NULL);
105 if (EVP_PKEY_encrypt_init(pctx) <= 0)
108 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
109 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
110 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
114 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
117 ek = OPENSSL_malloc(eklen);
120 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
124 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
127 ASN1_STRING_set0(ri->enc_key, ek, eklen);
133 EVP_PKEY_CTX_free(pctx);
139 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
140 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
142 EVP_PKEY_CTX *pctx = NULL;
143 unsigned char *ek = NULL;
148 pctx = EVP_PKEY_CTX_new(pkey, NULL);
152 if (EVP_PKEY_decrypt_init(pctx) <= 0)
155 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
156 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
157 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
161 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
162 ri->enc_key->data, ri->enc_key->length) <= 0)
165 ek = OPENSSL_malloc(eklen);
168 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
172 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
173 ri->enc_key->data, ri->enc_key->length) <= 0) {
175 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
181 OPENSSL_clear_free(*pek, *peklen);
186 EVP_PKEY_CTX_free(pctx);
193 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
196 BIO *out = NULL, *btmp = NULL;
197 X509_ALGOR *xa = NULL;
198 const EVP_CIPHER *evp_cipher = NULL;
199 STACK_OF(X509_ALGOR) *md_sk = NULL;
200 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
201 X509_ALGOR *xalg = NULL;
202 PKCS7_RECIP_INFO *ri = NULL;
203 ASN1_OCTET_STRING *os = NULL;
206 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
210 * The content field in the PKCS7 ContentInfo is optional, but that really
211 * only applies to inner content (precisely, detached signatures).
213 * When reading content, missing outer content is therefore treated as an
216 * When creating content, PKCS7_content_new() must be called before
217 * calling this method, so a NULL p7->d is always an error.
219 if (p7->d.ptr == NULL) {
220 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
224 i = OBJ_obj2nid(p7->type);
225 p7->state = PKCS7_S_HEADER;
228 case NID_pkcs7_signed:
229 md_sk = p7->d.sign->md_algs;
230 os = PKCS7_get_octet_string(p7->d.sign->contents);
232 case NID_pkcs7_signedAndEnveloped:
233 rsk = p7->d.signed_and_enveloped->recipientinfo;
234 md_sk = p7->d.signed_and_enveloped->md_algs;
235 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
236 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
237 if (evp_cipher == NULL) {
238 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
242 case NID_pkcs7_enveloped:
243 rsk = p7->d.enveloped->recipientinfo;
244 xalg = p7->d.enveloped->enc_data->algorithm;
245 evp_cipher = p7->d.enveloped->enc_data->cipher;
246 if (evp_cipher == NULL) {
247 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
251 case NID_pkcs7_digest:
252 xa = p7->d.digest->md;
253 os = PKCS7_get_octet_string(p7->d.digest->contents);
258 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
262 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
263 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
266 if (xa && !PKCS7_bio_add_digest(&out, xa))
269 if (evp_cipher != NULL) {
270 unsigned char key[EVP_MAX_KEY_LENGTH];
271 unsigned char iv[EVP_MAX_IV_LENGTH];
275 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
276 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
279 BIO_get_cipher_ctx(btmp, &ctx);
280 keylen = EVP_CIPHER_key_length(evp_cipher);
281 ivlen = EVP_CIPHER_iv_length(evp_cipher);
282 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
284 if (RAND_bytes(iv, ivlen) <= 0)
286 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
288 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
290 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
294 if (xalg->parameter == NULL) {
295 xalg->parameter = ASN1_TYPE_new();
296 if (xalg->parameter == NULL)
299 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
303 /* Lets do the pub key stuff :-) */
304 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
305 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
306 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
309 OPENSSL_cleanse(key, keylen);
319 if (PKCS7_is_detached(p7)) {
320 bio = BIO_new(BIO_s_null());
321 } else if (os && os->length > 0) {
322 bio = BIO_new_mem_buf(os->data, os->length);
324 bio = BIO_new(BIO_s_mem());
327 BIO_set_mem_eof_return(bio, 0);
344 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
347 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
348 X509_get_issuer_name(pcert));
351 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
352 ri->issuer_and_serial->serial);
356 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
359 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
361 ASN1_OCTET_STRING *data_body = NULL;
362 const EVP_MD *evp_md;
363 const EVP_CIPHER *evp_cipher = NULL;
364 EVP_CIPHER_CTX *evp_ctx = NULL;
365 X509_ALGOR *enc_alg = NULL;
366 STACK_OF(X509_ALGOR) *md_sk = NULL;
367 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
368 PKCS7_RECIP_INFO *ri = NULL;
369 unsigned char *ek = NULL, *tkey = NULL;
370 int eklen = 0, tkeylen = 0;
373 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
377 if (p7->d.ptr == NULL) {
378 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
382 i = OBJ_obj2nid(p7->type);
383 p7->state = PKCS7_S_HEADER;
386 case NID_pkcs7_signed:
388 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
389 * field and optional content.
390 * data_body is NULL if that structure has no (=detached) content
391 * or if the contentType is wrong (i.e., not "data").
393 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
394 if (!PKCS7_is_detached(p7) && data_body == NULL) {
395 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
396 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
399 md_sk = p7->d.sign->md_algs;
401 case NID_pkcs7_signedAndEnveloped:
402 rsk = p7->d.signed_and_enveloped->recipientinfo;
403 md_sk = p7->d.signed_and_enveloped->md_algs;
404 /* data_body is NULL if the optional EncryptedContent is missing. */
405 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
406 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
407 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
408 if (evp_cipher == NULL) {
409 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
410 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
414 case NID_pkcs7_enveloped:
415 rsk = p7->d.enveloped->recipientinfo;
416 enc_alg = p7->d.enveloped->enc_data->algorithm;
417 /* data_body is NULL if the optional EncryptedContent is missing. */
418 data_body = p7->d.enveloped->enc_data->enc_data;
419 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
420 if (evp_cipher == NULL) {
421 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
422 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
427 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
431 /* Detached content must be supplied via in_bio instead. */
432 if (data_body == NULL && in_bio == NULL) {
433 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
437 /* We will be checking the signature */
439 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
440 xa = sk_X509_ALGOR_value(md_sk, i);
441 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
442 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
446 j = OBJ_obj2nid(xa->algorithm);
447 evp_md = EVP_get_digestbynid(j);
448 if (evp_md == NULL) {
449 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
450 PKCS7_R_UNKNOWN_DIGEST_TYPE);
454 BIO_set_md(btmp, evp_md);
463 if (evp_cipher != NULL) {
464 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
465 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
470 * It was encrypted, we need to decrypt the secret key with the
475 * Find the recipientInfo which matches the passed certificate (if
480 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
481 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
482 if (!pkcs7_cmp_ri(ri, pcert))
487 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
488 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
493 /* If we haven't got a certificate try each ri in turn */
496 * Always attempt to decrypt all rinfo even after success as a
497 * defence against MMA timing attacks.
499 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
500 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
502 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
507 /* Only exit on fatal errors, not decrypt failure */
508 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
514 BIO_get_cipher_ctx(etmp, &evp_ctx);
515 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
517 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
519 /* Generate random key as MMA defence */
520 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
521 tkey = OPENSSL_malloc(tkeylen);
524 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
532 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
534 * Some S/MIME clients don't use the same key and effective key
535 * length. The key length is determined by the size of the
538 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
539 /* Use random key as MMA defence */
540 OPENSSL_clear_free(ek, eklen);
546 /* Clear errors so we don't leak information useful in MMA */
548 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
551 OPENSSL_clear_free(ek, eklen);
553 OPENSSL_clear_free(tkey, tkeylen);
562 if (in_bio != NULL) {
565 if (data_body->length > 0)
566 bio = BIO_new_mem_buf(data_body->data, data_body->length);
568 bio = BIO_new(BIO_s_mem());
571 BIO_set_mem_eof_return(bio, 0);
581 OPENSSL_clear_free(ek, eklen);
582 OPENSSL_clear_free(tkey, tkeylen);
590 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
593 bio = BIO_find_type(bio, BIO_TYPE_MD);
595 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
596 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
599 BIO_get_md_ctx(bio, pmd);
601 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
604 if (EVP_MD_CTX_type(*pmd) == nid)
611 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
613 unsigned char md_data[EVP_MAX_MD_SIZE];
616 /* Add signing time if not already present */
617 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
618 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
619 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
625 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
626 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
629 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
630 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
634 /* Now sign the attributes */
635 if (!PKCS7_SIGNER_INFO_sign(si))
641 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
646 PKCS7_SIGNER_INFO *si;
647 EVP_MD_CTX *mdc, *ctx_tmp;
648 STACK_OF(X509_ATTRIBUTE) *sk;
649 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
650 ASN1_OCTET_STRING *os = NULL;
653 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
657 if (p7->d.ptr == NULL) {
658 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
662 ctx_tmp = EVP_MD_CTX_new();
663 if (ctx_tmp == NULL) {
664 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
668 i = OBJ_obj2nid(p7->type);
669 p7->state = PKCS7_S_HEADER;
675 case NID_pkcs7_signedAndEnveloped:
676 /* XXXXXXXXXXXXXXXX */
677 si_sk = p7->d.signed_and_enveloped->signer_info;
678 os = p7->d.signed_and_enveloped->enc_data->enc_data;
680 os = ASN1_OCTET_STRING_new();
682 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
685 p7->d.signed_and_enveloped->enc_data->enc_data = os;
688 case NID_pkcs7_enveloped:
689 /* XXXXXXXXXXXXXXXX */
690 os = p7->d.enveloped->enc_data->enc_data;
692 os = ASN1_OCTET_STRING_new();
694 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
697 p7->d.enveloped->enc_data->enc_data = os;
700 case NID_pkcs7_signed:
701 si_sk = p7->d.sign->signer_info;
702 os = PKCS7_get_octet_string(p7->d.sign->contents);
703 /* If detached data then the content is excluded */
704 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
705 ASN1_OCTET_STRING_free(os);
707 p7->d.sign->contents->d.data = NULL;
711 case NID_pkcs7_digest:
712 os = PKCS7_get_octet_string(p7->d.digest->contents);
713 /* If detached data then the content is excluded */
714 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
715 ASN1_OCTET_STRING_free(os);
717 p7->d.digest->contents->d.data = NULL;
722 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
727 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
728 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
729 if (si->pkey == NULL)
732 j = OBJ_obj2nid(si->digest_alg->algorithm);
736 btmp = PKCS7_find_digest(&mdc, btmp, j);
742 * We now have the EVP_MD_CTX, lets do the signing.
744 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
750 * If there are attributes, we add the digest attribute and only
751 * sign the attributes
753 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
754 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
757 unsigned char *abuf = NULL;
758 unsigned int abuflen;
759 abuflen = EVP_PKEY_size(si->pkey);
760 abuf = OPENSSL_malloc(abuflen);
764 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
766 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
769 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
772 } else if (i == NID_pkcs7_digest) {
773 unsigned char md_data[EVP_MAX_MD_SIZE];
775 if (!PKCS7_find_digest(&mdc, bio,
776 OBJ_obj2nid(p7->d.digest->md->algorithm)))
778 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
780 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
784 if (!PKCS7_is_detached(p7)) {
786 * NOTE(emilia): I think we only reach os == NULL here because detached
787 * digested data support is broken.
791 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
794 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
796 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
799 contlen = BIO_get_mem_data(btmp, &cont);
801 * Mark the BIO read only then we can use its copy of the data
802 * instead of making an extra copy.
804 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
805 BIO_set_mem_eof_return(btmp, 0);
806 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
811 EVP_MD_CTX_free(ctx_tmp);
815 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
818 EVP_PKEY_CTX *pctx = NULL;
819 unsigned char *abuf = NULL;
822 const EVP_MD *md = NULL;
824 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
828 mctx = EVP_MD_CTX_new();
830 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
834 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
838 * TODO(3.0): This causes problems when providers are in use, so disabled
839 * for now. Can we get rid of this completely? AFAICT this ctrl has never
840 * been used since it was first put in. All internal implementations just
841 * return 1 and ignore this ctrl and have always done so by the looks of
842 * things. To fix this we could convert this ctrl into a param, which would
843 * require us to send all the signer info data as a set of params...but that
844 * is non-trivial and since this isn't used by anything it may be better
845 * just to remove it. The original commit that added it had this
846 * justification in CHANGES:
848 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
849 * EVP_PKEY_METHOD before and after signing via the
850 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
851 * before and/or after signing if necessary."
854 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
855 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
856 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
861 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
862 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
865 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
869 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
871 abuf = OPENSSL_malloc(siglen);
874 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
878 * TODO(3.0): This causes problems when providers are in use, so disabled
879 * for now. Can we get rid of this completely? AFAICT this ctrl has never
880 * been used since it was first put in. All internal implementations just
881 * return 1 and ignore this ctrl and have always done so by the looks of
882 * things. To fix this we could convert this ctrl into a param, which would
883 * require us to send all the signer info data as a set of params...but that
884 * is non-trivial and since this isn't used by anything it may be better
885 * just to remove it. The original commit that added it had this
886 * justification in CHANGES:
888 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
889 * EVP_PKEY_METHOD before and after signing via the
890 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
891 * before and/or after signing if necessary."
894 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
895 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
896 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
901 EVP_MD_CTX_free(mctx);
903 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
909 EVP_MD_CTX_free(mctx);
914 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
915 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
917 PKCS7_ISSUER_AND_SERIAL *ias;
919 STACK_OF(X509) *cert;
923 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
927 if (p7->d.ptr == NULL) {
928 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
932 if (PKCS7_type_is_signed(p7)) {
933 cert = p7->d.sign->cert;
934 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
935 cert = p7->d.signed_and_enveloped->cert;
937 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
940 /* XXXXXXXXXXXXXXXXXXXXXXX */
941 ias = si->issuer_and_serial;
943 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
945 /* were we able to find the cert in passed to us */
947 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
948 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
953 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
954 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
957 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
958 i = X509_verify_cert(ctx);
960 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
961 X509_STORE_CTX_cleanup(ctx);
964 X509_STORE_CTX_cleanup(ctx);
966 return PKCS7_signatureVerify(bio, p7, si, x509);
971 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
974 ASN1_OCTET_STRING *os;
975 EVP_MD_CTX *mdc_tmp, *mdc;
978 STACK_OF(X509_ATTRIBUTE) *sk;
982 mdc_tmp = EVP_MD_CTX_new();
983 if (mdc_tmp == NULL) {
984 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
988 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
989 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
993 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
997 if ((btmp == NULL) ||
998 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
999 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1000 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1003 BIO_get_md_ctx(btmp, &mdc);
1005 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1008 if (EVP_MD_CTX_type(mdc) == md_type)
1011 * Workaround for some broken clients that put the signature OID
1012 * instead of the digest OID in digest_alg->algorithm
1014 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1016 btmp = BIO_next(btmp);
1020 * mdc is the digest ctx that we want, unless there are attributes, in
1021 * which case the digest is the signed attributes
1023 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1027 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1028 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1029 unsigned int md_len;
1031 ASN1_OCTET_STRING *message_digest;
1033 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1035 message_digest = PKCS7_digest_from_attributes(sk);
1036 if (!message_digest) {
1037 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1038 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1041 if ((message_digest->length != (int)md_len) ||
1042 (memcmp(message_digest->data, md_dat, md_len))) {
1043 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1048 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1051 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1052 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1054 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1058 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1064 os = si->enc_digest;
1065 pkey = X509_get0_pubkey(x509);
1071 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1073 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1079 EVP_MD_CTX_free(mdc_tmp);
1083 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1085 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1086 PKCS7_RECIP_INFO *ri;
1089 i = OBJ_obj2nid(p7->type);
1090 if (i != NID_pkcs7_signedAndEnveloped)
1092 if (p7->d.signed_and_enveloped == NULL)
1094 rsk = p7->d.signed_and_enveloped->recipientinfo;
1097 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1099 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1100 return ri->issuer_and_serial;
1103 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1105 return get_attribute(si->auth_attr, nid);
1108 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1110 return get_attribute(si->unauth_attr, nid);
1113 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1117 idx = X509at_get_attr_by_NID(sk, nid, -1);
1118 xa = X509at_get_attr(sk, idx);
1119 return X509_ATTRIBUTE_get0_type(xa, 0);
1122 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1125 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1127 return astype->value.octet_string;
1130 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1131 STACK_OF(X509_ATTRIBUTE) *sk)
1135 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1136 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1137 if (p7si->auth_attr == NULL)
1139 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1140 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1141 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1149 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1150 STACK_OF(X509_ATTRIBUTE) *sk)
1154 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1155 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1156 if (p7si->unauth_attr == NULL)
1158 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1159 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1160 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1168 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1171 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1174 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1177 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1180 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1183 X509_ATTRIBUTE *attr = NULL;
1186 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1189 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1191 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1192 X509_ATTRIBUTE_free(attr);
1198 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1199 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1200 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1201 X509_ATTRIBUTE_free(attr);
1202 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1205 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1206 X509_ATTRIBUTE_free(attr);