552 lines
17 KiB
C
552 lines
17 KiB
C
/* smime.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 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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/* S/MIME utility function */
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#include <stdio.h>
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#include <string.h>
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#include "apps.h"
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#include <openssl/crypto.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#undef PROG
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#define PROG smime_main
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static X509_STORE *setup_verify(char *CAfile, char *CApath);
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static int save_certs(char *signerfile, STACK_OF(X509) *signers);
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#define SMIME_OP 0x10
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#define SMIME_ENCRYPT (1 | SMIME_OP)
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#define SMIME_DECRYPT 2
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#define SMIME_SIGN (3 | SMIME_OP)
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#define SMIME_VERIFY 4
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#define SMIME_PK7OUT 5
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int MAIN(int, char **);
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int MAIN(int argc, char **argv)
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{
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int operation = 0;
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int ret = 0;
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char **args;
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char *inmode = "r", *outmode = "w";
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char *infile = NULL, *outfile = NULL;
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char *signerfile = NULL, *recipfile = NULL;
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char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
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EVP_CIPHER *cipher = NULL;
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PKCS7 *p7 = NULL;
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X509_STORE *store = NULL;
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X509 *cert = NULL, *recip = NULL, *signer = NULL;
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EVP_PKEY *key = NULL;
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STACK_OF(X509) *encerts = NULL, *other = NULL;
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BIO *in = NULL, *out = NULL, *indata = NULL;
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int badarg = 0;
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int flags = PKCS7_DETACHED;
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char *to = NULL, *from = NULL, *subject = NULL;
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char *CAfile = NULL, *CApath = NULL;
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char *passargin = NULL, *passin = NULL;
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char *inrand = NULL;
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int need_rand = 0;
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int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
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args = argv + 1;
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ret = 1;
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while (!badarg && *args && *args[0] == '-') {
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if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
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else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
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else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
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else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
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else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
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#ifndef NO_DES
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else if (!strcmp (*args, "-des3"))
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cipher = EVP_des_ede3_cbc();
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else if (!strcmp (*args, "-des"))
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cipher = EVP_des_cbc();
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#endif
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#ifndef NO_RC2
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else if (!strcmp (*args, "-rc2-40"))
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cipher = EVP_rc2_40_cbc();
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else if (!strcmp (*args, "-rc2-128"))
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cipher = EVP_rc2_cbc();
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else if (!strcmp (*args, "-rc2-64"))
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cipher = EVP_rc2_64_cbc();
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#endif
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else if (!strcmp (*args, "-text"))
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flags |= PKCS7_TEXT;
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else if (!strcmp (*args, "-nointern"))
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flags |= PKCS7_NOINTERN;
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else if (!strcmp (*args, "-noverify"))
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flags |= PKCS7_NOVERIFY;
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else if (!strcmp (*args, "-nochain"))
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flags |= PKCS7_NOCHAIN;
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else if (!strcmp (*args, "-nocerts"))
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flags |= PKCS7_NOCERTS;
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else if (!strcmp (*args, "-noattr"))
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flags |= PKCS7_NOATTR;
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else if (!strcmp (*args, "-nodetach"))
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flags &= ~PKCS7_DETACHED;
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else if (!strcmp (*args, "-nosmimecap"))
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flags |= PKCS7_NOSMIMECAP;
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else if (!strcmp (*args, "-binary"))
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flags |= PKCS7_BINARY;
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else if (!strcmp (*args, "-nosigs"))
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flags |= PKCS7_NOSIGS;
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else if (!strcmp(*args,"-rand")) {
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if (args[1]) {
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args++;
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inrand = *args;
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} else badarg = 1;
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need_rand = 1;
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} else if (!strcmp(*args,"-passin")) {
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if (args[1]) {
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args++;
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passargin = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-to")) {
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if (args[1]) {
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args++;
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to = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-from")) {
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if (args[1]) {
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args++;
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from = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-subject")) {
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if (args[1]) {
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args++;
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subject = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-signer")) {
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if (args[1]) {
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args++;
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signerfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-recip")) {
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if (args[1]) {
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args++;
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recipfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-inkey")) {
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if (args[1]) {
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args++;
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keyfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-certfile")) {
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if (args[1]) {
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args++;
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certfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-CAfile")) {
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if (args[1]) {
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args++;
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CAfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-CApath")) {
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if (args[1]) {
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args++;
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CApath = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-in")) {
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if (args[1]) {
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args++;
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infile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-inform")) {
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if (args[1]) {
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args++;
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informat = str2fmt(*args);
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} else badarg = 1;
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} else if (!strcmp (*args, "-outform")) {
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if (args[1]) {
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args++;
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outformat = str2fmt(*args);
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} else badarg = 1;
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} else if (!strcmp (*args, "-out")) {
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if (args[1]) {
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args++;
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outfile = *args;
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} else badarg = 1;
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} else if (!strcmp (*args, "-content")) {
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if (args[1]) {
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args++;
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contfile = *args;
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} else badarg = 1;
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} else badarg = 1;
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args++;
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}
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if(operation == SMIME_SIGN) {
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if(!signerfile) {
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BIO_printf(bio_err, "No signer certificate specified\n");
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badarg = 1;
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}
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need_rand = 1;
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} else if(operation == SMIME_DECRYPT) {
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if(!recipfile) {
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BIO_printf(bio_err, "No recipient certificate and key specified\n");
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badarg = 1;
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}
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} else if(operation == SMIME_ENCRYPT) {
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if(!*args) {
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BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
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badarg = 1;
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}
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need_rand = 1;
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} else if(!operation) badarg = 1;
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if (badarg) {
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BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
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BIO_printf (bio_err, "where options are\n");
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BIO_printf (bio_err, "-encrypt encrypt message\n");
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BIO_printf (bio_err, "-decrypt decrypt encrypted message\n");
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BIO_printf (bio_err, "-sign sign message\n");
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BIO_printf (bio_err, "-verify verify signed message\n");
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BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n");
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#ifndef NO_DES
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BIO_printf (bio_err, "-des3 encrypt with triple DES\n");
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BIO_printf (bio_err, "-des encrypt with DES\n");
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#endif
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#ifndef NO_RC2
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BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n");
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BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n");
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BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n");
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#endif
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BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n");
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BIO_printf (bio_err, "-nosigs don't verify message signature\n");
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BIO_printf (bio_err, "-noverify don't verify signers certificate\n");
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BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n");
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BIO_printf (bio_err, "-nodetach use opaque signing\n");
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BIO_printf (bio_err, "-noattr don't include any signed attributes\n");
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BIO_printf (bio_err, "-binary don't translate message to text\n");
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BIO_printf (bio_err, "-certfile file other certificates file\n");
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BIO_printf (bio_err, "-signer file signer certificate file\n");
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BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n");
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BIO_printf (bio_err, "-in file input file\n");
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BIO_printf (bio_err, "-inform arg input format SMIME (default), PEM or DER\n");
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BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n");
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BIO_printf (bio_err, "-out file output file\n");
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BIO_printf (bio_err, "-outform arg output format SMIME (default), PEM or DER\n");
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BIO_printf (bio_err, "-content file supply or override content for detached signature\n");
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BIO_printf (bio_err, "-to addr to address\n");
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BIO_printf (bio_err, "-from ad from address\n");
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BIO_printf (bio_err, "-subject s subject\n");
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BIO_printf (bio_err, "-text include or delete text MIME headers\n");
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BIO_printf (bio_err, "-CApath dir trusted certificates directory\n");
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BIO_printf (bio_err, "-CAfile file trusted certificates file\n");
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BIO_printf (bio_err, "-passin arg input file pass phrase source\n");
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BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
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BIO_printf(bio_err, " load the file (or the files in the directory) into\n");
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BIO_printf(bio_err, " the random number generator\n");
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BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n");
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goto end;
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}
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if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
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BIO_printf(bio_err, "Error getting password\n");
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goto end;
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}
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if (need_rand) {
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app_RAND_load_file(NULL, bio_err, (inrand != NULL));
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if (inrand != NULL)
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BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
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app_RAND_load_files(inrand));
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}
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ret = 2;
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if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
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if(operation & SMIME_OP) {
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if(flags & PKCS7_BINARY) inmode = "rb";
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if(outformat == FORMAT_ASN1) outmode = "wb";
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} else {
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if(flags & PKCS7_BINARY) outmode = "wb";
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if(informat == FORMAT_ASN1) inmode = "rb";
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}
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if(operation == SMIME_ENCRYPT) {
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if (!cipher) {
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#ifndef NO_RC2
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cipher = EVP_rc2_40_cbc();
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#else
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BIO_printf(bio_err, "No cipher selected\n");
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goto end;
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#endif
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}
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encerts = sk_X509_new_null();
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while (*args) {
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if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) {
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BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
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goto end;
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}
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sk_X509_push(encerts, cert);
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cert = NULL;
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args++;
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}
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}
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if(signerfile && (operation == SMIME_SIGN)) {
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if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) {
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BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
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goto end;
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}
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}
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if(certfile) {
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if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) {
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BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if(recipfile && (operation == SMIME_DECRYPT)) {
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if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) {
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BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if(operation == SMIME_DECRYPT) {
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if(!keyfile) keyfile = recipfile;
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} else if(operation == SMIME_SIGN) {
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if(!keyfile) keyfile = signerfile;
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} else keyfile = NULL;
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if(keyfile) {
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if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) {
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BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
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ERR_print_errors(bio_err);
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goto end;
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}
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}
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if (infile) {
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if (!(in = BIO_new_file(infile, inmode))) {
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BIO_printf (bio_err,
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"Can't open input file %s\n", infile);
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goto end;
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}
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} else in = BIO_new_fp(stdin, BIO_NOCLOSE);
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if (outfile) {
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if (!(out = BIO_new_file(outfile, outmode))) {
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BIO_printf (bio_err,
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"Can't open output file %s\n", outfile);
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goto end;
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}
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} else {
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out = BIO_new_fp(stdout, BIO_NOCLOSE);
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#ifdef VMS
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{
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BIO *tmpbio = BIO_new(BIO_f_linebuffer());
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out = BIO_push(tmpbio, out);
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}
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#endif
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}
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if(operation == SMIME_VERIFY) {
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if(!(store = setup_verify(CAfile, CApath))) goto end;
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}
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ret = 3;
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if(operation == SMIME_ENCRYPT) {
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p7 = PKCS7_encrypt(encerts, in, cipher, flags);
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} else if(operation == SMIME_SIGN) {
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p7 = PKCS7_sign(signer, key, other, in, flags);
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if (BIO_reset(in) != 0 && (flags & PKCS7_DETACHED)) {
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BIO_printf(bio_err, "Can't rewind input file\n");
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goto end;
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}
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} else {
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if(informat == FORMAT_SMIME)
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p7 = SMIME_read_PKCS7(in, &indata);
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else if(informat == FORMAT_PEM)
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p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
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else if(informat == FORMAT_ASN1)
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p7 = d2i_PKCS7_bio(in, NULL);
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else {
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BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
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goto end;
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}
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if(!p7) {
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BIO_printf(bio_err, "Error reading S/MIME message\n");
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goto end;
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}
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if(contfile) {
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BIO_free(indata);
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if(!(indata = BIO_new_file(contfile, "rb"))) {
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BIO_printf(bio_err, "Can't read content file %s\n", contfile);
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goto end;
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}
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}
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}
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if(!p7) {
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BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
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goto end;
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}
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ret = 4;
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if(operation == SMIME_DECRYPT) {
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if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
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BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
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goto end;
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}
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} else if(operation == SMIME_VERIFY) {
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STACK_OF(X509) *signers;
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if(PKCS7_verify(p7, other, store, indata, out, flags)) {
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BIO_printf(bio_err, "Verification successful\n");
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} else {
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BIO_printf(bio_err, "Verification failure\n");
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goto end;
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}
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signers = PKCS7_get0_signers(p7, other, flags);
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if(!save_certs(signerfile, signers)) {
|
|
BIO_printf(bio_err, "Error writing signers to %s\n",
|
|
signerfile);
|
|
ret = 5;
|
|
goto end;
|
|
}
|
|
sk_X509_free(signers);
|
|
} else if(operation == SMIME_PK7OUT) {
|
|
PEM_write_bio_PKCS7(out, p7);
|
|
} else {
|
|
if(to) BIO_printf(out, "To: %s\n", to);
|
|
if(from) BIO_printf(out, "From: %s\n", from);
|
|
if(subject) BIO_printf(out, "Subject: %s\n", subject);
|
|
if(outformat == FORMAT_SMIME)
|
|
SMIME_write_PKCS7(out, p7, in, flags);
|
|
else if(outformat == FORMAT_PEM)
|
|
PEM_write_bio_PKCS7(out,p7);
|
|
else if(outformat == FORMAT_ASN1)
|
|
i2d_PKCS7_bio(out,p7);
|
|
else {
|
|
BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
|
|
goto end;
|
|
}
|
|
}
|
|
ret = 0;
|
|
end:
|
|
if (need_rand)
|
|
app_RAND_write_file(NULL, bio_err);
|
|
if(ret) ERR_print_errors(bio_err);
|
|
sk_X509_pop_free(encerts, X509_free);
|
|
sk_X509_pop_free(other, X509_free);
|
|
X509_STORE_free(store);
|
|
X509_free(cert);
|
|
X509_free(recip);
|
|
X509_free(signer);
|
|
EVP_PKEY_free(key);
|
|
PKCS7_free(p7);
|
|
BIO_free(in);
|
|
BIO_free(indata);
|
|
BIO_free_all(out);
|
|
if(passin) OPENSSL_free(passin);
|
|
return (ret);
|
|
}
|
|
|
|
static X509_STORE *setup_verify(char *CAfile, char *CApath)
|
|
{
|
|
X509_STORE *store;
|
|
X509_LOOKUP *lookup;
|
|
if(!(store = X509_STORE_new())) goto end;
|
|
lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
|
|
if (lookup == NULL) goto end;
|
|
if (CAfile) {
|
|
if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
|
|
BIO_printf(bio_err, "Error loading file %s\n", CAfile);
|
|
goto end;
|
|
}
|
|
} else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
|
|
|
|
lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
|
|
if (lookup == NULL) goto end;
|
|
if (CApath) {
|
|
if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
|
|
BIO_printf(bio_err, "Error loading directory %s\n", CApath);
|
|
goto end;
|
|
}
|
|
} else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
|
|
|
|
ERR_clear_error();
|
|
return store;
|
|
end:
|
|
X509_STORE_free(store);
|
|
return NULL;
|
|
}
|
|
|
|
static int save_certs(char *signerfile, STACK_OF(X509) *signers)
|
|
{
|
|
int i;
|
|
BIO *tmp;
|
|
if(!signerfile) return 1;
|
|
tmp = BIO_new_file(signerfile, "w");
|
|
if(!tmp) return 0;
|
|
for(i = 0; i < sk_X509_num(signers); i++)
|
|
PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
|
|
BIO_free(tmp);
|
|
return 1;
|
|
}
|
|
|