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 DEFINE_STACK_OF(X509_ALGOR)
19 DEFINE_STACK_OF(X509_ATTRIBUTE)
20 DEFINE_STACK_OF(PKCS7_RECIP_INFO)
21 DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
23 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
25 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
27 static int PKCS7_type_is_other(PKCS7 *p7)
31 int nid = OBJ_obj2nid(p7->type);
35 case NID_pkcs7_signed:
36 case NID_pkcs7_enveloped:
37 case NID_pkcs7_signedAndEnveloped:
38 case NID_pkcs7_digest:
39 case NID_pkcs7_encrypted:
50 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
52 if (PKCS7_type_is_data(p7))
54 if (PKCS7_type_is_other(p7) && p7->d.other
55 && (p7->d.other->type == V_ASN1_OCTET_STRING))
56 return p7->d.other->value.octet_string;
60 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
64 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
65 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
69 md = EVP_get_digestbyobj(alg->algorithm);
71 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
78 else if (!BIO_push(*pbio, btmp)) {
79 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
92 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
93 unsigned char *key, int keylen)
95 EVP_PKEY_CTX *pctx = NULL;
96 EVP_PKEY *pkey = NULL;
97 unsigned char *ek = NULL;
101 pkey = X509_get0_pubkey(ri->cert);
105 pctx = EVP_PKEY_CTX_new(pkey, NULL);
109 if (EVP_PKEY_encrypt_init(pctx) <= 0)
112 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
113 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
114 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
118 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
121 ek = OPENSSL_malloc(eklen);
124 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
128 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
131 ASN1_STRING_set0(ri->enc_key, ek, eklen);
137 EVP_PKEY_CTX_free(pctx);
143 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
144 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
147 EVP_PKEY_CTX *pctx = NULL;
148 unsigned char *ek = NULL;
152 pctx = EVP_PKEY_CTX_new(pkey, NULL);
156 if (EVP_PKEY_decrypt_init(pctx) <= 0)
159 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
160 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
161 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
165 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
166 ri->enc_key->data, ri->enc_key->length) <= 0)
169 ek = OPENSSL_malloc(eklen);
172 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
176 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
177 ri->enc_key->data, ri->enc_key->length) <= 0
179 || (fixlen != 0 && eklen != fixlen)) {
181 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
187 OPENSSL_clear_free(*pek, *peklen);
192 EVP_PKEY_CTX_free(pctx);
199 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
202 BIO *out = NULL, *btmp = NULL;
203 X509_ALGOR *xa = NULL;
204 const EVP_CIPHER *evp_cipher = NULL;
205 STACK_OF(X509_ALGOR) *md_sk = NULL;
206 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
207 X509_ALGOR *xalg = NULL;
208 PKCS7_RECIP_INFO *ri = NULL;
209 ASN1_OCTET_STRING *os = NULL;
212 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
216 * The content field in the PKCS7 ContentInfo is optional, but that really
217 * only applies to inner content (precisely, detached signatures).
219 * When reading content, missing outer content is therefore treated as an
222 * When creating content, PKCS7_content_new() must be called before
223 * calling this method, so a NULL p7->d is always an error.
225 if (p7->d.ptr == NULL) {
226 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
230 i = OBJ_obj2nid(p7->type);
231 p7->state = PKCS7_S_HEADER;
234 case NID_pkcs7_signed:
235 md_sk = p7->d.sign->md_algs;
236 os = PKCS7_get_octet_string(p7->d.sign->contents);
238 case NID_pkcs7_signedAndEnveloped:
239 rsk = p7->d.signed_and_enveloped->recipientinfo;
240 md_sk = p7->d.signed_and_enveloped->md_algs;
241 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
242 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
243 if (evp_cipher == NULL) {
244 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
248 case NID_pkcs7_enveloped:
249 rsk = p7->d.enveloped->recipientinfo;
250 xalg = p7->d.enveloped->enc_data->algorithm;
251 evp_cipher = p7->d.enveloped->enc_data->cipher;
252 if (evp_cipher == NULL) {
253 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
257 case NID_pkcs7_digest:
258 xa = p7->d.digest->md;
259 os = PKCS7_get_octet_string(p7->d.digest->contents);
264 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
268 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
269 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
272 if (xa && !PKCS7_bio_add_digest(&out, xa))
275 if (evp_cipher != NULL) {
276 unsigned char key[EVP_MAX_KEY_LENGTH];
277 unsigned char iv[EVP_MAX_IV_LENGTH];
281 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
282 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
285 BIO_get_cipher_ctx(btmp, &ctx);
286 keylen = EVP_CIPHER_key_length(evp_cipher);
287 ivlen = EVP_CIPHER_iv_length(evp_cipher);
288 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
290 if (RAND_bytes(iv, ivlen) <= 0)
292 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
294 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
296 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
300 if (xalg->parameter == NULL) {
301 xalg->parameter = ASN1_TYPE_new();
302 if (xalg->parameter == NULL)
305 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
309 /* Lets do the pub key stuff :-) */
310 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
311 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
312 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
315 OPENSSL_cleanse(key, keylen);
325 if (PKCS7_is_detached(p7)) {
326 bio = BIO_new(BIO_s_null());
327 } else if (os && os->length > 0) {
328 bio = BIO_new_mem_buf(os->data, os->length);
330 bio = BIO_new(BIO_s_mem());
333 BIO_set_mem_eof_return(bio, 0);
350 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
353 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
354 X509_get_issuer_name(pcert));
357 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
358 ri->issuer_and_serial->serial);
362 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
365 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
367 ASN1_OCTET_STRING *data_body = NULL;
368 const EVP_MD *evp_md;
369 const EVP_CIPHER *evp_cipher = NULL;
370 EVP_CIPHER_CTX *evp_ctx = NULL;
371 X509_ALGOR *enc_alg = NULL;
372 STACK_OF(X509_ALGOR) *md_sk = NULL;
373 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
374 PKCS7_RECIP_INFO *ri = NULL;
375 unsigned char *ek = NULL, *tkey = NULL;
376 int eklen = 0, tkeylen = 0;
379 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
383 if (p7->d.ptr == NULL) {
384 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
388 i = OBJ_obj2nid(p7->type);
389 p7->state = PKCS7_S_HEADER;
392 case NID_pkcs7_signed:
394 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
395 * field and optional content.
396 * data_body is NULL if that structure has no (=detached) content
397 * or if the contentType is wrong (i.e., not "data").
399 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
400 if (!PKCS7_is_detached(p7) && data_body == NULL) {
401 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
402 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
405 md_sk = p7->d.sign->md_algs;
407 case NID_pkcs7_signedAndEnveloped:
408 rsk = p7->d.signed_and_enveloped->recipientinfo;
409 md_sk = p7->d.signed_and_enveloped->md_algs;
410 /* data_body is NULL if the optional EncryptedContent is missing. */
411 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
412 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
413 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
414 if (evp_cipher == NULL) {
415 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
416 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
420 case NID_pkcs7_enveloped:
421 rsk = p7->d.enveloped->recipientinfo;
422 enc_alg = p7->d.enveloped->enc_data->algorithm;
423 /* data_body is NULL if the optional EncryptedContent is missing. */
424 data_body = p7->d.enveloped->enc_data->enc_data;
425 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
426 if (evp_cipher == NULL) {
427 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
428 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
433 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
437 /* Detached content must be supplied via in_bio instead. */
438 if (data_body == NULL && in_bio == NULL) {
439 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
443 /* We will be checking the signature */
445 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
446 xa = sk_X509_ALGOR_value(md_sk, i);
447 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
448 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
452 j = OBJ_obj2nid(xa->algorithm);
453 evp_md = EVP_get_digestbynid(j);
454 if (evp_md == NULL) {
455 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
456 PKCS7_R_UNKNOWN_DIGEST_TYPE);
460 BIO_set_md(btmp, evp_md);
469 if (evp_cipher != NULL) {
470 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
471 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
476 * It was encrypted, we need to decrypt the secret key with the
481 * Find the recipientInfo which matches the passed certificate (if
486 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
487 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
488 if (!pkcs7_cmp_ri(ri, pcert))
493 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
494 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
499 /* If we haven't got a certificate try each ri in turn */
502 * Always attempt to decrypt all rinfo even after success as a
503 * defence against MMA timing attacks.
505 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
506 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
508 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
509 EVP_CIPHER_key_length(evp_cipher)) < 0)
514 /* Only exit on fatal errors, not decrypt failure */
515 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
521 BIO_get_cipher_ctx(etmp, &evp_ctx);
522 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
524 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
526 /* Generate random key as MMA defence */
527 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
528 tkey = OPENSSL_malloc(tkeylen);
531 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
539 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
541 * Some S/MIME clients don't use the same key and effective key
542 * length. The key length is determined by the size of the
545 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
546 /* Use random key as MMA defence */
547 OPENSSL_clear_free(ek, eklen);
553 /* Clear errors so we don't leak information useful in MMA */
555 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
558 OPENSSL_clear_free(ek, eklen);
560 OPENSSL_clear_free(tkey, tkeylen);
569 if (in_bio != NULL) {
572 if (data_body->length > 0)
573 bio = BIO_new_mem_buf(data_body->data, data_body->length);
575 bio = BIO_new(BIO_s_mem());
578 BIO_set_mem_eof_return(bio, 0);
588 OPENSSL_clear_free(ek, eklen);
589 OPENSSL_clear_free(tkey, tkeylen);
597 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
600 bio = BIO_find_type(bio, BIO_TYPE_MD);
602 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
603 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
606 BIO_get_md_ctx(bio, pmd);
608 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
611 if (EVP_MD_CTX_type(*pmd) == nid)
618 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
620 unsigned char md_data[EVP_MAX_MD_SIZE];
623 /* Add signing time if not already present */
624 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
625 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
626 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
632 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
633 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
636 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
637 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
641 /* Now sign the attributes */
642 if (!PKCS7_SIGNER_INFO_sign(si))
648 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
653 PKCS7_SIGNER_INFO *si;
654 EVP_MD_CTX *mdc, *ctx_tmp;
655 STACK_OF(X509_ATTRIBUTE) *sk;
656 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
657 ASN1_OCTET_STRING *os = NULL;
660 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
664 if (p7->d.ptr == NULL) {
665 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
669 ctx_tmp = EVP_MD_CTX_new();
670 if (ctx_tmp == NULL) {
671 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
675 i = OBJ_obj2nid(p7->type);
676 p7->state = PKCS7_S_HEADER;
682 case NID_pkcs7_signedAndEnveloped:
683 /* XXXXXXXXXXXXXXXX */
684 si_sk = p7->d.signed_and_enveloped->signer_info;
685 os = p7->d.signed_and_enveloped->enc_data->enc_data;
687 os = ASN1_OCTET_STRING_new();
689 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
692 p7->d.signed_and_enveloped->enc_data->enc_data = os;
695 case NID_pkcs7_enveloped:
696 /* XXXXXXXXXXXXXXXX */
697 os = p7->d.enveloped->enc_data->enc_data;
699 os = ASN1_OCTET_STRING_new();
701 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
704 p7->d.enveloped->enc_data->enc_data = os;
707 case NID_pkcs7_signed:
708 si_sk = p7->d.sign->signer_info;
709 os = PKCS7_get_octet_string(p7->d.sign->contents);
710 /* If detached data then the content is excluded */
711 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
712 ASN1_OCTET_STRING_free(os);
714 p7->d.sign->contents->d.data = NULL;
718 case NID_pkcs7_digest:
719 os = PKCS7_get_octet_string(p7->d.digest->contents);
720 /* If detached data then the content is excluded */
721 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
722 ASN1_OCTET_STRING_free(os);
724 p7->d.digest->contents->d.data = NULL;
729 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
734 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
735 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
736 if (si->pkey == NULL)
739 j = OBJ_obj2nid(si->digest_alg->algorithm);
743 btmp = PKCS7_find_digest(&mdc, btmp, j);
749 * We now have the EVP_MD_CTX, lets do the signing.
751 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
757 * If there are attributes, we add the digest attribute and only
758 * sign the attributes
760 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
761 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
764 unsigned char *abuf = NULL;
765 unsigned int abuflen;
766 abuflen = EVP_PKEY_size(si->pkey);
767 abuf = OPENSSL_malloc(abuflen);
771 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
773 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
776 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
779 } else if (i == NID_pkcs7_digest) {
780 unsigned char md_data[EVP_MAX_MD_SIZE];
782 if (!PKCS7_find_digest(&mdc, bio,
783 OBJ_obj2nid(p7->d.digest->md->algorithm)))
785 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
787 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
791 if (!PKCS7_is_detached(p7)) {
793 * NOTE(emilia): I think we only reach os == NULL here because detached
794 * digested data support is broken.
798 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
801 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
803 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
806 contlen = BIO_get_mem_data(btmp, &cont);
808 * Mark the BIO read only then we can use its copy of the data
809 * instead of making an extra copy.
811 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
812 BIO_set_mem_eof_return(btmp, 0);
813 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
818 EVP_MD_CTX_free(ctx_tmp);
822 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
825 EVP_PKEY_CTX *pctx = NULL;
826 unsigned char *abuf = NULL;
829 const EVP_MD *md = NULL;
831 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
835 mctx = EVP_MD_CTX_new();
837 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
841 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
845 * TODO(3.0): This causes problems when providers are in use, so disabled
846 * for now. Can we get rid of this completely? AFAICT this ctrl has never
847 * been used since it was first put in. All internal implementations just
848 * return 1 and ignore this ctrl and have always done so by the looks of
849 * things. To fix this we could convert this ctrl into a param, which would
850 * require us to send all the signer info data as a set of params...but that
851 * is non-trivial and since this isn't used by anything it may be better
852 * just to remove it. The original commit that added it had this
853 * justification in CHANGES:
855 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
856 * EVP_PKEY_METHOD before and after signing via the
857 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
858 * before and/or after signing if necessary."
861 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
862 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
863 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
868 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
869 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
872 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
876 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
878 abuf = OPENSSL_malloc(siglen);
881 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
885 * TODO(3.0): This causes problems when providers are in use, so disabled
886 * for now. Can we get rid of this completely? AFAICT this ctrl has never
887 * been used since it was first put in. All internal implementations just
888 * return 1 and ignore this ctrl and have always done so by the looks of
889 * things. To fix this we could convert this ctrl into a param, which would
890 * require us to send all the signer info data as a set of params...but that
891 * is non-trivial and since this isn't used by anything it may be better
892 * just to remove it. The original commit that added it had this
893 * justification in CHANGES:
895 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
896 * EVP_PKEY_METHOD before and after signing via the
897 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
898 * before and/or after signing if necessary."
901 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
902 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
903 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
908 EVP_MD_CTX_free(mctx);
910 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
916 EVP_MD_CTX_free(mctx);
921 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
922 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
924 PKCS7_ISSUER_AND_SERIAL *ias;
926 STACK_OF(X509) *cert;
930 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
934 if (p7->d.ptr == NULL) {
935 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
939 if (PKCS7_type_is_signed(p7)) {
940 cert = p7->d.sign->cert;
941 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
942 cert = p7->d.signed_and_enveloped->cert;
944 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
947 /* XXXXXXXXXXXXXXXXXXXXXXX */
948 ias = si->issuer_and_serial;
950 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
952 /* were we able to find the cert in passed to us */
954 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
955 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
960 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
961 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
964 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
965 i = X509_verify_cert(ctx);
967 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
968 X509_STORE_CTX_cleanup(ctx);
971 X509_STORE_CTX_cleanup(ctx);
973 return PKCS7_signatureVerify(bio, p7, si, x509);
978 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
981 ASN1_OCTET_STRING *os;
982 EVP_MD_CTX *mdc_tmp, *mdc;
985 STACK_OF(X509_ATTRIBUTE) *sk;
989 mdc_tmp = EVP_MD_CTX_new();
990 if (mdc_tmp == NULL) {
991 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
995 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
996 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1000 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1004 if ((btmp == NULL) ||
1005 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1006 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1007 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1010 BIO_get_md_ctx(btmp, &mdc);
1012 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1015 if (EVP_MD_CTX_type(mdc) == md_type)
1018 * Workaround for some broken clients that put the signature OID
1019 * instead of the digest OID in digest_alg->algorithm
1021 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1023 btmp = BIO_next(btmp);
1027 * mdc is the digest ctx that we want, unless there are attributes, in
1028 * which case the digest is the signed attributes
1030 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1034 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1035 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1036 unsigned int md_len;
1038 ASN1_OCTET_STRING *message_digest;
1040 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1042 message_digest = PKCS7_digest_from_attributes(sk);
1043 if (!message_digest) {
1044 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1045 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1048 if ((message_digest->length != (int)md_len) ||
1049 (memcmp(message_digest->data, md_dat, md_len))) {
1050 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1055 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1058 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1059 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1061 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1065 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1071 os = si->enc_digest;
1072 pkey = X509_get0_pubkey(x509);
1078 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1080 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1086 EVP_MD_CTX_free(mdc_tmp);
1090 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1092 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1093 PKCS7_RECIP_INFO *ri;
1096 i = OBJ_obj2nid(p7->type);
1097 if (i != NID_pkcs7_signedAndEnveloped)
1099 if (p7->d.signed_and_enveloped == NULL)
1101 rsk = p7->d.signed_and_enveloped->recipientinfo;
1104 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1106 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1107 return ri->issuer_and_serial;
1110 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1112 return get_attribute(si->auth_attr, nid);
1115 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1117 return get_attribute(si->unauth_attr, nid);
1120 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1124 idx = X509at_get_attr_by_NID(sk, nid, -1);
1125 xa = X509at_get_attr(sk, idx);
1126 return X509_ATTRIBUTE_get0_type(xa, 0);
1129 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1132 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1134 return astype->value.octet_string;
1137 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1138 STACK_OF(X509_ATTRIBUTE) *sk)
1142 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1143 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1144 if (p7si->auth_attr == NULL)
1146 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1147 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1148 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1156 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1157 STACK_OF(X509_ATTRIBUTE) *sk)
1161 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1162 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1163 if (p7si->unauth_attr == NULL)
1165 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1166 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1167 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1175 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1178 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1181 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1184 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1187 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1190 X509_ATTRIBUTE *attr = NULL;
1193 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1196 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1198 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1199 X509_ATTRIBUTE_free(attr);
1205 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1206 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1207 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1208 X509_ATTRIBUTE_free(attr);
1209 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1212 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1213 X509_ATTRIBUTE_free(attr);