11d8cdc6ad
I thought it was about time I dusted this off. This stuff had been sitting on my hard drive for *ages* (2003 in fact). Hasn't been tested well and may not work properly. Nothing uses it at present which is just as well. Think of this as a traditional Christmas present which looks far more impressive in the adverts and on the box, some of the bits are missing and falls to bits if you play with it too much.
585 lines
15 KiB
C
585 lines
15 KiB
C
/* pk7_smime.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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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{
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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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{
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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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{
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for(i = 0; i < sk_X509_num(certs); i++)
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{
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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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{
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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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BIO_flush(p7bio);
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if (!PKCS7_dataFinal(p7,p7bio))
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{
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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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int si_free = 1;
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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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{
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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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{
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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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/* si is now part of p7 so don't free it on error */
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si_free = 0;
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if(!(flags & PKCS7_NOCERTS))
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{
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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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{
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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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{
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if(!(smcap = sk_X509_ALGOR_new_null()))
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{
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PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
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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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{
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if (!pkcs7_copy_existing_digest(p7, si))
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goto err;
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if (!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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if (si && si_free)
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PKCS7_SIGNER_INFO_free(si);
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return NULL;
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}
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/* Search for a digest matching SignerInfo digest type and if found
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* copy 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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{
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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,
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sitmp->digest_alg->algorithm))
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{
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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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/* 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) return 0;
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/* Now verify the certificates */
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if (!(flags & PKCS7_NOVERIFY)) 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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{
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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_purpose(&cert_ctx,
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X509_PURPOSE_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) 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,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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/* Performance optimization: if the content is a memory BIO then
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* store its contents in a temporary read only memory BIO. This
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* avoids potentially large numbers of slow copies of data which will
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* occur when reading from a read write memory BIO when signatures
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* are calculated.
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*/
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if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
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{
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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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{
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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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}
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else
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tmpin = indata;
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p7bio=PKCS7_dataInit(p7,tmpin);
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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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} else 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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{
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i=BIO_read(p7bio,buf,sizeof(buf));
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if (i <= 0) break;
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if (tmpout) 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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{
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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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{
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if (indata) 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, 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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{
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si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
|
|
ias = si->issuer_and_serial;
|
|
signer = NULL;
|
|
/* If any certificates passed they take priority */
|
|
if (certs) signer = X509_find_by_issuer_and_serial (certs,
|
|
ias->issuer, ias->serial);
|
|
if (!signer && !(flags & PKCS7_NOINTERN)
|
|
&& 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;
|
|
}
|
|
|
|
sk_X509_push(signers, signer);
|
|
}
|
|
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;
|
|
}
|
|
|
|
PKCS7_set_type(p7, NID_pkcs7_enveloped);
|
|
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(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);
|
|
return 0;
|
|
}
|
|
if(!(bread = BIO_push(tmpbuf, tmpmem))) {
|
|
PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
ret = SMIME_text(bread, data);
|
|
BIO_free_all(bread);
|
|
return ret;
|
|
} else {
|
|
for(;;) {
|
|
i = BIO_read(tmpmem, buf, sizeof(buf));
|
|
if(i <= 0) break;
|
|
BIO_write(data, buf, i);
|
|
}
|
|
BIO_free_all(tmpmem);
|
|
return 1;
|
|
}
|
|
}
|