2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
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,
143 EVP_PKEY_CTX *pctx = NULL;
144 unsigned char *ek = NULL;
149 pctx = EVP_PKEY_CTX_new(pkey, NULL);
153 if (EVP_PKEY_decrypt_init(pctx) <= 0)
156 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
157 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
158 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
162 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
163 ri->enc_key->data, ri->enc_key->length) <= 0)
166 ek = OPENSSL_malloc(eklen);
169 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
173 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
174 ri->enc_key->data, ri->enc_key->length) <= 0
176 || (fixlen != 0 && eklen != fixlen)) {
178 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
184 OPENSSL_clear_free(*pek, *peklen);
189 EVP_PKEY_CTX_free(pctx);
196 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
199 BIO *out = NULL, *btmp = NULL;
200 X509_ALGOR *xa = NULL;
201 const EVP_CIPHER *evp_cipher = NULL;
202 STACK_OF(X509_ALGOR) *md_sk = NULL;
203 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
204 X509_ALGOR *xalg = NULL;
205 PKCS7_RECIP_INFO *ri = NULL;
206 ASN1_OCTET_STRING *os = NULL;
209 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
213 * The content field in the PKCS7 ContentInfo is optional, but that really
214 * only applies to inner content (precisely, detached signatures).
216 * When reading content, missing outer content is therefore treated as an
219 * When creating content, PKCS7_content_new() must be called before
220 * calling this method, so a NULL p7->d is always an error.
222 if (p7->d.ptr == NULL) {
223 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
227 i = OBJ_obj2nid(p7->type);
228 p7->state = PKCS7_S_HEADER;
231 case NID_pkcs7_signed:
232 md_sk = p7->d.sign->md_algs;
233 os = PKCS7_get_octet_string(p7->d.sign->contents);
235 case NID_pkcs7_signedAndEnveloped:
236 rsk = p7->d.signed_and_enveloped->recipientinfo;
237 md_sk = p7->d.signed_and_enveloped->md_algs;
238 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
239 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
240 if (evp_cipher == NULL) {
241 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
245 case NID_pkcs7_enveloped:
246 rsk = p7->d.enveloped->recipientinfo;
247 xalg = p7->d.enveloped->enc_data->algorithm;
248 evp_cipher = p7->d.enveloped->enc_data->cipher;
249 if (evp_cipher == NULL) {
250 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
254 case NID_pkcs7_digest:
255 xa = p7->d.digest->md;
256 os = PKCS7_get_octet_string(p7->d.digest->contents);
261 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
265 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
266 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
269 if (xa && !PKCS7_bio_add_digest(&out, xa))
272 if (evp_cipher != NULL) {
273 unsigned char key[EVP_MAX_KEY_LENGTH];
274 unsigned char iv[EVP_MAX_IV_LENGTH];
278 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
279 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
282 BIO_get_cipher_ctx(btmp, &ctx);
283 keylen = EVP_CIPHER_key_length(evp_cipher);
284 ivlen = EVP_CIPHER_iv_length(evp_cipher);
285 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
287 if (RAND_bytes(iv, ivlen) <= 0)
289 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
291 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
293 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
297 if (xalg->parameter == NULL) {
298 xalg->parameter = ASN1_TYPE_new();
299 if (xalg->parameter == NULL)
302 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
306 /* Lets do the pub key stuff :-) */
307 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
308 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
309 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
312 OPENSSL_cleanse(key, keylen);
322 if (PKCS7_is_detached(p7)) {
323 bio = BIO_new(BIO_s_null());
324 } else if (os && os->length > 0) {
325 bio = BIO_new_mem_buf(os->data, os->length);
327 bio = BIO_new(BIO_s_mem());
330 BIO_set_mem_eof_return(bio, 0);
347 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
350 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
351 X509_get_issuer_name(pcert));
354 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
355 ri->issuer_and_serial->serial);
359 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
362 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
364 ASN1_OCTET_STRING *data_body = NULL;
365 const EVP_MD *evp_md;
366 const EVP_CIPHER *evp_cipher = NULL;
367 EVP_CIPHER_CTX *evp_ctx = NULL;
368 X509_ALGOR *enc_alg = NULL;
369 STACK_OF(X509_ALGOR) *md_sk = NULL;
370 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
371 PKCS7_RECIP_INFO *ri = NULL;
372 unsigned char *ek = NULL, *tkey = NULL;
373 int eklen = 0, tkeylen = 0;
376 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
380 if (p7->d.ptr == NULL) {
381 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
385 i = OBJ_obj2nid(p7->type);
386 p7->state = PKCS7_S_HEADER;
389 case NID_pkcs7_signed:
391 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
392 * field and optional content.
393 * data_body is NULL if that structure has no (=detached) content
394 * or if the contentType is wrong (i.e., not "data").
396 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
397 if (!PKCS7_is_detached(p7) && data_body == NULL) {
398 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
399 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
402 md_sk = p7->d.sign->md_algs;
404 case NID_pkcs7_signedAndEnveloped:
405 rsk = p7->d.signed_and_enveloped->recipientinfo;
406 md_sk = p7->d.signed_and_enveloped->md_algs;
407 /* data_body is NULL if the optional EncryptedContent is missing. */
408 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
409 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
410 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
411 if (evp_cipher == NULL) {
412 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
413 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
417 case NID_pkcs7_enveloped:
418 rsk = p7->d.enveloped->recipientinfo;
419 enc_alg = p7->d.enveloped->enc_data->algorithm;
420 /* data_body is NULL if the optional EncryptedContent is missing. */
421 data_body = p7->d.enveloped->enc_data->enc_data;
422 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
423 if (evp_cipher == NULL) {
424 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
425 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
430 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
434 /* Detached content must be supplied via in_bio instead. */
435 if (data_body == NULL && in_bio == NULL) {
436 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
440 /* We will be checking the signature */
442 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
443 xa = sk_X509_ALGOR_value(md_sk, i);
444 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
445 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
449 j = OBJ_obj2nid(xa->algorithm);
450 evp_md = EVP_get_digestbynid(j);
451 if (evp_md == NULL) {
452 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
453 PKCS7_R_UNKNOWN_DIGEST_TYPE);
457 BIO_set_md(btmp, evp_md);
466 if (evp_cipher != NULL) {
467 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
468 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
473 * It was encrypted, we need to decrypt the secret key with the
478 * Find the recipientInfo which matches the passed certificate (if
483 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
484 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
485 if (!pkcs7_cmp_ri(ri, pcert))
490 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
491 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
496 /* If we haven't got a certificate try each ri in turn */
499 * Always attempt to decrypt all rinfo even after success as a
500 * defence against MMA timing attacks.
502 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
503 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
505 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
506 EVP_CIPHER_key_length(evp_cipher)) < 0)
511 /* Only exit on fatal errors, not decrypt failure */
512 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
518 BIO_get_cipher_ctx(etmp, &evp_ctx);
519 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
521 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
523 /* Generate random key as MMA defence */
524 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
525 tkey = OPENSSL_malloc(tkeylen);
528 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
536 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
538 * Some S/MIME clients don't use the same key and effective key
539 * length. The key length is determined by the size of the
542 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
543 /* Use random key as MMA defence */
544 OPENSSL_clear_free(ek, eklen);
550 /* Clear errors so we don't leak information useful in MMA */
552 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
555 OPENSSL_clear_free(ek, eklen);
557 OPENSSL_clear_free(tkey, tkeylen);
566 if (in_bio != NULL) {
569 if (data_body->length > 0)
570 bio = BIO_new_mem_buf(data_body->data, data_body->length);
572 bio = BIO_new(BIO_s_mem());
575 BIO_set_mem_eof_return(bio, 0);
585 OPENSSL_clear_free(ek, eklen);
586 OPENSSL_clear_free(tkey, tkeylen);
594 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
597 bio = BIO_find_type(bio, BIO_TYPE_MD);
599 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
600 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
603 BIO_get_md_ctx(bio, pmd);
605 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
608 if (EVP_MD_CTX_type(*pmd) == nid)
615 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
617 unsigned char md_data[EVP_MAX_MD_SIZE];
620 /* Add signing time if not already present */
621 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
622 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
623 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
629 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
630 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
633 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
634 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
638 /* Now sign the attributes */
639 if (!PKCS7_SIGNER_INFO_sign(si))
645 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
650 PKCS7_SIGNER_INFO *si;
651 EVP_MD_CTX *mdc, *ctx_tmp;
652 STACK_OF(X509_ATTRIBUTE) *sk;
653 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
654 ASN1_OCTET_STRING *os = NULL;
657 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
661 if (p7->d.ptr == NULL) {
662 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
666 ctx_tmp = EVP_MD_CTX_new();
667 if (ctx_tmp == NULL) {
668 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
672 i = OBJ_obj2nid(p7->type);
673 p7->state = PKCS7_S_HEADER;
679 case NID_pkcs7_signedAndEnveloped:
680 /* XXXXXXXXXXXXXXXX */
681 si_sk = p7->d.signed_and_enveloped->signer_info;
682 os = p7->d.signed_and_enveloped->enc_data->enc_data;
684 os = ASN1_OCTET_STRING_new();
686 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
689 p7->d.signed_and_enveloped->enc_data->enc_data = os;
692 case NID_pkcs7_enveloped:
693 /* XXXXXXXXXXXXXXXX */
694 os = p7->d.enveloped->enc_data->enc_data;
696 os = ASN1_OCTET_STRING_new();
698 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
701 p7->d.enveloped->enc_data->enc_data = os;
704 case NID_pkcs7_signed:
705 si_sk = p7->d.sign->signer_info;
706 os = PKCS7_get_octet_string(p7->d.sign->contents);
707 /* If detached data then the content is excluded */
708 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
709 ASN1_OCTET_STRING_free(os);
711 p7->d.sign->contents->d.data = NULL;
715 case NID_pkcs7_digest:
716 os = PKCS7_get_octet_string(p7->d.digest->contents);
717 /* If detached data then the content is excluded */
718 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
719 ASN1_OCTET_STRING_free(os);
721 p7->d.digest->contents->d.data = NULL;
726 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
731 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
732 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
733 if (si->pkey == NULL)
736 j = OBJ_obj2nid(si->digest_alg->algorithm);
740 btmp = PKCS7_find_digest(&mdc, btmp, j);
746 * We now have the EVP_MD_CTX, lets do the signing.
748 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
754 * If there are attributes, we add the digest attribute and only
755 * sign the attributes
757 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
758 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
761 unsigned char *abuf = NULL;
762 unsigned int abuflen;
763 abuflen = EVP_PKEY_size(si->pkey);
764 abuf = OPENSSL_malloc(abuflen);
768 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
770 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
773 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
776 } else if (i == NID_pkcs7_digest) {
777 unsigned char md_data[EVP_MAX_MD_SIZE];
779 if (!PKCS7_find_digest(&mdc, bio,
780 OBJ_obj2nid(p7->d.digest->md->algorithm)))
782 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
784 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
788 if (!PKCS7_is_detached(p7)) {
790 * NOTE(emilia): I think we only reach os == NULL here because detached
791 * digested data support is broken.
795 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
798 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
800 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
803 contlen = BIO_get_mem_data(btmp, &cont);
805 * Mark the BIO read only then we can use its copy of the data
806 * instead of making an extra copy.
808 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
809 BIO_set_mem_eof_return(btmp, 0);
810 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
815 EVP_MD_CTX_free(ctx_tmp);
819 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
822 EVP_PKEY_CTX *pctx = NULL;
823 unsigned char *abuf = NULL;
826 const EVP_MD *md = NULL;
828 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
832 mctx = EVP_MD_CTX_new();
834 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
838 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
841 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
842 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
843 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
847 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
848 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
851 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
855 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
857 abuf = OPENSSL_malloc(siglen);
860 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
863 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
864 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
865 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
869 EVP_MD_CTX_free(mctx);
871 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
877 EVP_MD_CTX_free(mctx);
882 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
883 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
885 PKCS7_ISSUER_AND_SERIAL *ias;
887 STACK_OF(X509) *cert;
891 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
895 if (p7->d.ptr == NULL) {
896 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
900 if (PKCS7_type_is_signed(p7)) {
901 cert = p7->d.sign->cert;
902 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
903 cert = p7->d.signed_and_enveloped->cert;
905 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
908 /* XXXXXXXXXXXXXXXXXXXXXXX */
909 ias = si->issuer_and_serial;
911 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
913 /* were we able to find the cert in passed to us */
915 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
916 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
921 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
922 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
925 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
926 i = X509_verify_cert(ctx);
928 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
929 X509_STORE_CTX_cleanup(ctx);
932 X509_STORE_CTX_cleanup(ctx);
934 return PKCS7_signatureVerify(bio, p7, si, x509);
939 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
942 ASN1_OCTET_STRING *os;
943 EVP_MD_CTX *mdc_tmp, *mdc;
946 STACK_OF(X509_ATTRIBUTE) *sk;
950 mdc_tmp = EVP_MD_CTX_new();
951 if (mdc_tmp == NULL) {
952 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
956 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
957 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
961 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
965 if ((btmp == NULL) ||
966 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
967 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
968 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
971 BIO_get_md_ctx(btmp, &mdc);
973 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
976 if (EVP_MD_CTX_type(mdc) == md_type)
979 * Workaround for some broken clients that put the signature OID
980 * instead of the digest OID in digest_alg->algorithm
982 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
984 btmp = BIO_next(btmp);
988 * mdc is the digest ctx that we want, unless there are attributes, in
989 * which case the digest is the signed attributes
991 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
995 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
996 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
999 ASN1_OCTET_STRING *message_digest;
1001 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1003 message_digest = PKCS7_digest_from_attributes(sk);
1004 if (!message_digest) {
1005 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1006 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1009 if ((message_digest->length != (int)md_len) ||
1010 (memcmp(message_digest->data, md_dat, md_len))) {
1011 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1016 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1019 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1020 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1022 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1026 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1032 os = si->enc_digest;
1033 pkey = X509_get0_pubkey(x509);
1039 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1041 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1047 EVP_MD_CTX_free(mdc_tmp);
1051 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1053 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1054 PKCS7_RECIP_INFO *ri;
1057 i = OBJ_obj2nid(p7->type);
1058 if (i != NID_pkcs7_signedAndEnveloped)
1060 if (p7->d.signed_and_enveloped == NULL)
1062 rsk = p7->d.signed_and_enveloped->recipientinfo;
1065 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1067 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1068 return ri->issuer_and_serial;
1071 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1073 return get_attribute(si->auth_attr, nid);
1076 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1078 return get_attribute(si->unauth_attr, nid);
1081 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1085 idx = X509at_get_attr_by_NID(sk, nid, -1);
1086 xa = X509at_get_attr(sk, idx);
1087 return X509_ATTRIBUTE_get0_type(xa, 0);
1090 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1093 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1095 return astype->value.octet_string;
1098 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1099 STACK_OF(X509_ATTRIBUTE) *sk)
1103 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1104 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1105 if (p7si->auth_attr == NULL)
1107 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1108 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1109 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1117 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1118 STACK_OF(X509_ATTRIBUTE) *sk)
1122 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1123 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1124 if (p7si->unauth_attr == NULL)
1126 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1127 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1128 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1136 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1139 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1142 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1145 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1148 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1151 X509_ATTRIBUTE *attr = NULL;
1154 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1157 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1159 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1160 X509_ATTRIBUTE_free(attr);
1166 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1167 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1168 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1169 X509_ATTRIBUTE_free(attr);
1170 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1173 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1174 X509_ATTRIBUTE_free(attr);