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586 lines
18 KiB
586 lines
18 KiB
/* 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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|
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/* Simple PKCS#7 processing functions */ |
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|
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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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|
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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; |
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BIO *tmpin, *tmpout; |
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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. |
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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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sk_X509_free(signers); |
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return 0; |
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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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sk_X509_free(signers); |
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return 0; |
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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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sk_X509_free(signers); |
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return 0; |
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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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/* |
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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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|
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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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return 0; |
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} |
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} else |
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tmpin = indata; |
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|
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if (!(p7bio = PKCS7_dataInit(p7, tmpin))) |
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goto err; |
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|
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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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|
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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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|
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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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|
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err: |
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|
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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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|
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sk_X509_free(signers); |
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|
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return ret; |
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} |
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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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|
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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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|
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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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|
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/* Collect all the signers together */ |
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|
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sinfos = PKCS7_get_signer_info(p7); |
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|
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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); |
|
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) |
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signer = |
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X509_find_by_issuer_and_serial(p7->d.sign->cert, |
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ias->issuer, ias->serial); |
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if (!signer) { |
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PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, |
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PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); |
|
sk_X509_free(signers); |
|
return 0; |
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} |
|
|
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if (!sk_X509_push(signers, signer)) { |
|
sk_X509_free(signers); |
|
return NULL; |
|
} |
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} |
|
return signers; |
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} |
|
|
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/* Build a complete PKCS#7 enveloped data */ |
|
|
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PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, |
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int flags) |
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{ |
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PKCS7 *p7; |
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BIO *p7bio = NULL; |
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int i; |
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X509 *x509; |
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if (!(p7 = PKCS7_new())) { |
|
PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE); |
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return NULL; |
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} |
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|
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if (!PKCS7_set_type(p7, NID_pkcs7_enveloped)) |
|
goto err; |
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if (!PKCS7_set_cipher(p7, cipher)) { |
|
PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER); |
|
goto err; |
|
} |
|
|
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for (i = 0; i < sk_X509_num(certs); i++) { |
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x509 = sk_X509_value(certs, i); |
|
if (!PKCS7_add_recipient(p7, x509)) { |
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PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT); |
|
goto err; |
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} |
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} |
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|
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if (flags & PKCS7_STREAM) |
|
return p7; |
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|
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if (PKCS7_final(p7, in, flags)) |
|
return p7; |
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|
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err: |
|
|
|
BIO_free_all(p7bio); |
|
PKCS7_free(p7); |
|
return NULL; |
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|
|
} |
|
|
|
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; |
|
} |
|
}
|
|
|