590 lines
18 KiB
C
590 lines
18 KiB
C
/* pk7_smime.c */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Simple PKCS#7 processing functions */
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
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PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
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BIO *data, int flags)
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{
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PKCS7 *p7;
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int i;
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if (!(p7 = PKCS7_new())) {
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PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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if (!PKCS7_set_type(p7, NID_pkcs7_signed))
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goto err;
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if (!PKCS7_content_new(p7, NID_pkcs7_data))
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goto err;
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if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
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PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
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goto err;
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}
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if (!(flags & PKCS7_NOCERTS)) {
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for (i = 0; i < sk_X509_num(certs); i++) {
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if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
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goto err;
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}
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}
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if (flags & PKCS7_DETACHED)
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PKCS7_set_detached(p7, 1);
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if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
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return p7;
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if (PKCS7_final(p7, data, flags))
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return p7;
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err:
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PKCS7_free(p7);
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return NULL;
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}
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int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
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{
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BIO *p7bio;
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int ret = 0;
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if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
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PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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SMIME_crlf_copy(data, p7bio, flags);
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(void)BIO_flush(p7bio);
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if (!PKCS7_dataFinal(p7, p7bio)) {
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PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
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goto err;
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}
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ret = 1;
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err:
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BIO_free_all(p7bio);
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return ret;
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}
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/* Check to see if a cipher exists and if so add S/MIME capabilities */
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static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
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{
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if (EVP_get_cipherbynid(nid))
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return PKCS7_simple_smimecap(sk, nid, arg);
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return 1;
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}
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static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
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{
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if (EVP_get_digestbynid(nid))
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return PKCS7_simple_smimecap(sk, nid, arg);
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return 1;
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}
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PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
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EVP_PKEY *pkey, const EVP_MD *md,
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int flags)
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{
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PKCS7_SIGNER_INFO *si = NULL;
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STACK_OF(X509_ALGOR) *smcap = NULL;
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if (!X509_check_private_key(signcert, pkey)) {
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PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
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PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
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return NULL;
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}
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if (!(si = PKCS7_add_signature(p7, signcert, pkey, md))) {
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PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
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PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
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return NULL;
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}
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if (!(flags & PKCS7_NOCERTS)) {
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if (!PKCS7_add_certificate(p7, signcert))
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goto err;
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}
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if (!(flags & PKCS7_NOATTR)) {
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if (!PKCS7_add_attrib_content_type(si, NULL))
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goto err;
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/* Add SMIMECapabilities */
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if (!(flags & PKCS7_NOSMIMECAP)) {
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if (!(smcap = sk_X509_ALGOR_new_null())) {
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PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
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|| !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
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|| !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
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|| !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
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|| !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
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|| !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
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|| !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
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|| !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
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|| !add_cipher_smcap(smcap, NID_des_cbc, -1)
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|| !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
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|| !PKCS7_add_attrib_smimecap(si, smcap))
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goto err;
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sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
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smcap = NULL;
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}
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if (flags & PKCS7_REUSE_DIGEST) {
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if (!pkcs7_copy_existing_digest(p7, si))
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goto err;
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if (!(flags & PKCS7_PARTIAL) && !PKCS7_SIGNER_INFO_sign(si))
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goto err;
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}
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}
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return si;
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err:
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if (smcap)
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sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
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return NULL;
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}
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/*
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* Search for a digest matching SignerInfo digest type and if found copy
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* across.
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*/
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static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
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{
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int i;
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STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
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PKCS7_SIGNER_INFO *sitmp;
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ASN1_OCTET_STRING *osdig = NULL;
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sinfos = PKCS7_get_signer_info(p7);
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for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
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sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
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if (si == sitmp)
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break;
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if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
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continue;
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if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
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osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
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break;
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}
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}
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if (osdig)
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return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
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PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
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PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
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return 0;
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}
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int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
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BIO *indata, BIO *out, int flags)
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{
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STACK_OF(X509) *signers;
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X509 *signer;
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STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
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PKCS7_SIGNER_INFO *si;
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X509_STORE_CTX cert_ctx;
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char buf[4096];
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int i, j = 0, k, ret = 0;
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BIO *p7bio = NULL;
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BIO *tmpin = NULL, *tmpout = NULL;
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if (!p7) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
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return 0;
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}
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if (!PKCS7_type_is_signed(p7)) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
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return 0;
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}
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/* Check for no data and no content: no data to verify signature */
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if (PKCS7_get_detached(p7) && !indata) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
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return 0;
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}
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#if 0
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/*
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* NB: this test commented out because some versions of Netscape
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* illegally include zero length content when signing data. Also
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* Microsoft Authenticode includes a SpcIndirectDataContent data
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* structure which describes the content to be protected by the
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* signature, rather than directly embedding that content. So
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* Authenticode implementations are also expected to use
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* PKCS7_verify() with explicit external data, on non-detached
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* PKCS#7 signatures.
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*
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* In OpenSSL 1.1 a new flag PKCS7_NO_DUAL_CONTENT has been
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* introduced to disable this sanity check. For the 1.0.2 branch
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* this change is not acceptable, so the check remains completely
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* commented out (as it has been for a long time).
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*/
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/* Check for data and content: two sets of data */
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if (!PKCS7_get_detached(p7) && indata) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
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return 0;
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}
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#endif
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sinfos = PKCS7_get_signer_info(p7);
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if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
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return 0;
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}
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signers = PKCS7_get0_signers(p7, certs, flags);
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if (!signers)
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return 0;
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/* Now verify the certificates */
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if (!(flags & PKCS7_NOVERIFY))
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for (k = 0; k < sk_X509_num(signers); k++) {
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signer = sk_X509_value(signers, k);
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if (!(flags & PKCS7_NOCHAIN)) {
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if (!X509_STORE_CTX_init(&cert_ctx, store, signer,
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p7->d.sign->cert)) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
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goto err;
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}
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X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
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} else if (!X509_STORE_CTX_init(&cert_ctx, store, signer, NULL)) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
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goto err;
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}
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if (!(flags & PKCS7_NOCRL))
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X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
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i = X509_verify_cert(&cert_ctx);
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if (i <= 0)
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j = X509_STORE_CTX_get_error(&cert_ctx);
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X509_STORE_CTX_cleanup(&cert_ctx);
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if (i <= 0) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY,
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PKCS7_R_CERTIFICATE_VERIFY_ERROR);
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ERR_add_error_data(2, "Verify error:",
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X509_verify_cert_error_string(j));
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goto err;
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}
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/* Check for revocation status here */
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}
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/*
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* Performance optimization: if the content is a memory BIO then store
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* its contents in a temporary read only memory BIO. This avoids
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* potentially large numbers of slow copies of data which will occur when
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* reading from a read write memory BIO when signatures are calculated.
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*/
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if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
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char *ptr;
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long len;
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len = BIO_get_mem_data(indata, &ptr);
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tmpin = BIO_new_mem_buf(ptr, len);
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if (tmpin == NULL) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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} else
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tmpin = indata;
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if (!(p7bio = PKCS7_dataInit(p7, tmpin)))
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goto err;
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if (flags & PKCS7_TEXT) {
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if (!(tmpout = BIO_new(BIO_s_mem()))) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BIO_set_mem_eof_return(tmpout, 0);
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} else
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tmpout = out;
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/* We now have to 'read' from p7bio to calculate digests etc. */
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for (;;) {
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i = BIO_read(p7bio, buf, sizeof(buf));
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if (i <= 0)
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break;
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if (tmpout)
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BIO_write(tmpout, buf, i);
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}
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if (flags & PKCS7_TEXT) {
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if (!SMIME_text(tmpout, out)) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SMIME_TEXT_ERROR);
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BIO_free(tmpout);
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goto err;
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}
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BIO_free(tmpout);
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}
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/* Now Verify All Signatures */
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if (!(flags & PKCS7_NOSIGS))
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for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
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si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
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signer = sk_X509_value(signers, i);
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j = PKCS7_signatureVerify(p7bio, p7, si, signer);
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if (j <= 0) {
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PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
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goto err;
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}
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}
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ret = 1;
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err:
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if (tmpin == indata) {
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if (indata)
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BIO_pop(p7bio);
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}
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BIO_free_all(p7bio);
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sk_X509_free(signers);
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return ret;
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}
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STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
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int flags)
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{
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STACK_OF(X509) *signers;
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STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
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PKCS7_SIGNER_INFO *si;
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PKCS7_ISSUER_AND_SERIAL *ias;
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X509 *signer;
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int i;
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if (!p7) {
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PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
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return NULL;
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}
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if (!PKCS7_type_is_signed(p7)) {
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PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
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return NULL;
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}
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/* Collect all the signers together */
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sinfos = PKCS7_get_signer_info(p7);
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if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
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PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
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return 0;
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}
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if (!(signers = sk_X509_new_null())) {
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PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
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si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
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ias = si->issuer_and_serial;
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signer = NULL;
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/* If any certificates passed they take priority */
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if (certs)
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signer = X509_find_by_issuer_and_serial(certs,
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ias->issuer, ias->serial);
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if (!signer && !(flags & PKCS7_NOINTERN)
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&& p7->d.sign->cert)
|
|
signer =
|
|
X509_find_by_issuer_and_serial(p7->d.sign->cert,
|
|
ias->issuer, ias->serial);
|
|
if (!signer) {
|
|
PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
|
|
PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
|
|
sk_X509_free(signers);
|
|
return 0;
|
|
}
|
|
|
|
if (!sk_X509_push(signers, signer)) {
|
|
sk_X509_free(signers);
|
|
return NULL;
|
|
}
|
|
}
|
|
return signers;
|
|
}
|
|
|
|
/* Build a complete PKCS#7 enveloped data */
|
|
|
|
PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
|
|
int flags)
|
|
{
|
|
PKCS7 *p7;
|
|
BIO *p7bio = NULL;
|
|
int i;
|
|
X509 *x509;
|
|
if (!(p7 = PKCS7_new())) {
|
|
PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
|
return NULL;
|
|
}
|
|
|
|
if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
|
|
goto err;
|
|
if (!PKCS7_set_cipher(p7, cipher)) {
|
|
PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i < sk_X509_num(certs); i++) {
|
|
x509 = sk_X509_value(certs, i);
|
|
if (!PKCS7_add_recipient(p7, x509)) {
|
|
PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (flags & PKCS7_STREAM)
|
|
return p7;
|
|
|
|
if (PKCS7_final(p7, in, flags))
|
|
return p7;
|
|
|
|
err:
|
|
|
|
BIO_free_all(p7bio);
|
|
PKCS7_free(p7);
|
|
return NULL;
|
|
|
|
}
|
|
|
|
int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
|
|
{
|
|
BIO *tmpmem;
|
|
int ret, i;
|
|
char buf[4096];
|
|
|
|
if (!p7) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
|
|
return 0;
|
|
}
|
|
|
|
if (!PKCS7_type_is_enveloped(p7)) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
|
|
return 0;
|
|
}
|
|
|
|
if (cert && !X509_check_private_key(cert, pkey)) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT,
|
|
PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
|
|
return 0;
|
|
}
|
|
|
|
if (!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
if (flags & PKCS7_TEXT) {
|
|
BIO *tmpbuf, *bread;
|
|
/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
|
|
if (!(tmpbuf = BIO_new(BIO_f_buffer()))) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
|
|
BIO_free_all(tmpmem);
|
|
return 0;
|
|
}
|
|
if (!(bread = BIO_push(tmpbuf, tmpmem))) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
|
|
BIO_free_all(tmpbuf);
|
|
BIO_free_all(tmpmem);
|
|
return 0;
|
|
}
|
|
ret = SMIME_text(bread, data);
|
|
if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
|
|
if (!BIO_get_cipher_status(tmpmem))
|
|
ret = 0;
|
|
}
|
|
BIO_free_all(bread);
|
|
return ret;
|
|
} else {
|
|
for (;;) {
|
|
i = BIO_read(tmpmem, buf, sizeof(buf));
|
|
if (i <= 0) {
|
|
ret = 1;
|
|
if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
|
|
if (!BIO_get_cipher_status(tmpmem))
|
|
ret = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
if (BIO_write(data, buf, i) != i) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
BIO_free_all(tmpmem);
|
|
return ret;
|
|
}
|
|
}
|