apps/smime.c - third_party/openssl - Git at Google

 /* smime.c */
 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
  * project 1999.
  */
 /* ====================================================================
  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. All advertising materials mentioning features or use of this
  *    software must display the following acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    licensing@OpenSSL.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 /* S/MIME utility function */

 #include <stdio.h>
 #include <string.h>
 #include "apps.h"
 #include <openssl/crypto.h>
 #include <openssl/pem.h>
 #include <openssl/err.h>

 #undef PROG
 #define PROG smime_main
 static X509_STORE *setup_verify(char *CAfile, char *CApath);
 static int save_certs(char *signerfile, STACK_OF(X509) *signers);

 #define SMIME_OP	0x10
 #define SMIME_ENCRYPT	(1 | SMIME_OP)
 #define SMIME_DECRYPT	2
 #define SMIME_SIGN	(3 | SMIME_OP)
 #define SMIME_VERIFY	4
 #define SMIME_PK7OUT	5

 int MAIN(int, char **);

 int MAIN(int argc, char **argv)
 {
 	int operation = 0;
 	int ret = 0;
 	char **args;
 	char *inmode = "r", *outmode = "w";
 	char *infile = NULL, *outfile = NULL;
 	char *signerfile = NULL, *recipfile = NULL;
 	char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
 	EVP_CIPHER *cipher = NULL;
 	PKCS7 *p7 = NULL;
 	X509_STORE *store = NULL;
 	X509 *cert = NULL, *recip = NULL, *signer = NULL;
 	EVP_PKEY *key = NULL;
 	STACK_OF(X509) *encerts = NULL, *other = NULL;
 	BIO *in = NULL, *out = NULL, *indata = NULL;
 	int badarg = 0;
 	int flags = PKCS7_DETACHED;
 	char *to = NULL, *from = NULL, *subject = NULL;
 	char *CAfile = NULL, *CApath = NULL;
 	char *passargin = NULL, *passin = NULL;
 	char *inrand = NULL;
 	int need_rand = 0;
 	int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 	args = argv + 1;

 	ret = 1;

 	while (!badarg && *args && *args[0] == '-') {
 		if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 		else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 		else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 		else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 		else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 #ifndef NO_DES
 		else if (!strcmp (*args, "-des3"))
 				cipher = EVP_des_ede3_cbc();
 		else if (!strcmp (*args, "-des"))
 				cipher = EVP_des_cbc();
 #endif
 #ifndef NO_RC2
 		else if (!strcmp (*args, "-rc2-40"))
 				cipher = EVP_rc2_40_cbc();
 		else if (!strcmp (*args, "-rc2-128"))
 				cipher = EVP_rc2_cbc();
 		else if (!strcmp (*args, "-rc2-64"))
 				cipher = EVP_rc2_64_cbc();
 #endif
 		else if (!strcmp (*args, "-text"))
 				flags |= PKCS7_TEXT;
 		else if (!strcmp (*args, "-nointern"))
 				flags |= PKCS7_NOINTERN;
 		else if (!strcmp (*args, "-noverify"))
 				flags |= PKCS7_NOVERIFY;
 		else if (!strcmp (*args, "-nochain"))
 				flags |= PKCS7_NOCHAIN;
 		else if (!strcmp (*args, "-nocerts"))
 				flags |= PKCS7_NOCERTS;
 		else if (!strcmp (*args, "-noattr"))
 				flags |= PKCS7_NOATTR;
 		else if (!strcmp (*args, "-nodetach"))
 				flags &= ~PKCS7_DETACHED;
 		else if (!strcmp (*args, "-nosmimecap"))
 				flags |= PKCS7_NOSMIMECAP;
 		else if (!strcmp (*args, "-binary"))
 				flags |= PKCS7_BINARY;
 		else if (!strcmp (*args, "-nosigs"))
 				flags |= PKCS7_NOSIGS;
 		else if (!strcmp(*args,"-rand")) {
 			if (args[1]) {
 				args++;
 				inrand = *args;
 			} else badarg = 1;
 			need_rand = 1;
 		} else if (!strcmp(*args,"-passin")) {
 			if (args[1]) {
 				args++;
 				passargin = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-to")) {
 			if (args[1]) {
 				args++;
 				to = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-from")) {
 			if (args[1]) {
 				args++;
 				from = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-subject")) {
 			if (args[1]) {
 				args++;
 				subject = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-signer")) {
 			if (args[1]) {
 				args++;
 				signerfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-recip")) {
 			if (args[1]) {
 				args++;
 				recipfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-inkey")) {
 			if (args[1]) {
 				args++;
 				keyfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-certfile")) {
 			if (args[1]) {
 				args++;
 				certfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-CAfile")) {
 			if (args[1]) {
 				args++;
 				CAfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-CApath")) {
 			if (args[1]) {
 				args++;
 				CApath = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-in")) {
 			if (args[1]) {
 				args++;
 				infile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-inform")) {
 			if (args[1]) {
 				args++;
 				informat = str2fmt(*args);
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-outform")) {
 			if (args[1]) {
 				args++;
 				outformat = str2fmt(*args);
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-out")) {
 			if (args[1]) {
 				args++;
 				outfile = *args;
 			} else badarg = 1;
 		} else if (!strcmp (*args, "-content")) {
 			if (args[1]) {
 				args++;
 				contfile = *args;
 			} else badarg = 1;
 		} else badarg = 1;
 		args++;
 	}

 	if(operation == SMIME_SIGN) {
 		if(!signerfile) {
 			BIO_printf(bio_err, "No signer certificate specified\n");
 			badarg = 1;
 		}
 		need_rand = 1;
 	} else if(operation == SMIME_DECRYPT) {
 		if(!recipfile) {
 			BIO_printf(bio_err, "No recipient certificate and key specified\n");
 			badarg = 1;
 		}
 	} else if(operation == SMIME_ENCRYPT) {
 		if(!*args) {
 			BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 			badarg = 1;
 		}
 		need_rand = 1;
 	} else if(!operation) badarg = 1;

 	if (badarg) {
 		BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 		BIO_printf (bio_err, "where options are\n");
 		BIO_printf (bio_err, "-encrypt       encrypt message\n");
 		BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 		BIO_printf (bio_err, "-sign          sign message\n");
 		BIO_printf (bio_err, "-verify        verify signed message\n");
 		BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 #ifndef NO_DES
 		BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 		BIO_printf (bio_err, "-des           encrypt with DES\n");
 #endif
 #ifndef NO_RC2
 		BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 		BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 		BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 #endif
 		BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 		BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 		BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 		BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 		BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 		BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 		BIO_printf (bio_err, "-binary        don't translate message to text\n");
 		BIO_printf (bio_err, "-certfile file other certificates file\n");
 		BIO_printf (bio_err, "-signer file   signer certificate file\n");
 		BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 		BIO_printf (bio_err, "-in file       input file\n");
 		BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
 		BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 		BIO_printf (bio_err, "-out file      output file\n");
 		BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
 		BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
 		BIO_printf (bio_err, "-to addr       to address\n");
 		BIO_printf (bio_err, "-from ad       from address\n");
 		BIO_printf (bio_err, "-subject s     subject\n");
 		BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 		BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 		BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 		BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 		BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 		BIO_printf(bio_err,  "               the random number generator\n");
 		BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 		goto end;
 	}

 	if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 		BIO_printf(bio_err, "Error getting password\n");
 		goto end;
 	}

 	if (need_rand) {
 		app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 		if (inrand != NULL)
 			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 				app_RAND_load_files(inrand));
 	}

 	ret = 2;

 	if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;

 	if(operation & SMIME_OP) {
 		if(flags & PKCS7_BINARY) inmode = "rb";
 		if(outformat == FORMAT_ASN1) outmode = "wb";
 	} else {
 		if(flags & PKCS7_BINARY) outmode = "wb";
 		if(informat == FORMAT_ASN1) inmode = "rb";
 	}

 	if(operation == SMIME_ENCRYPT) {
 		if (!cipher) {
 #ifndef NO_RC2
 			cipher = EVP_rc2_40_cbc();
 #else
 			BIO_printf(bio_err, "No cipher selected\n");
 			goto end;
 #endif
 		}
 		encerts = sk_X509_new_null();
 		while (*args) {
 			if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) {
 				BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 				goto end;
 			}
 			sk_X509_push(encerts, cert);
 			cert = NULL;
 			args++;
 		}
 	}

 	if(signerfile && (operation == SMIME_SIGN)) {
 		if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) {
 			BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 			goto end;
 		}
 	}

 	if(certfile) {
 		if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) {
 			BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 			ERR_print_errors(bio_err);
 			goto end;
 		}
 	}

 	if(recipfile && (operation == SMIME_DECRYPT)) {
 		if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) {
 			BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 			ERR_print_errors(bio_err);
 			goto end;
 		}
 	}

 	if(operation == SMIME_DECRYPT) {
 		if(!keyfile) keyfile = recipfile;
 	} else if(operation == SMIME_SIGN) {
 		if(!keyfile) keyfile = signerfile;
 	} else keyfile = NULL;

 	if(keyfile) {
 		if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) {
 			BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 			ERR_print_errors(bio_err);
 			goto end;
 		}
 	}

 	if (infile) {
 		if (!(in = BIO_new_file(infile, inmode))) {
 			BIO_printf (bio_err,
 				 "Can't open input file %s\n", infile);
 			goto end;
 		}
 	} else in = BIO_new_fp(stdin, BIO_NOCLOSE);

 	if (outfile) {
 		if (!(out = BIO_new_file(outfile, outmode))) {
 			BIO_printf (bio_err,
 				 "Can't open output file %s\n", outfile);
 			goto end;
 		}
 	} else out = BIO_new_fp(stdout, BIO_NOCLOSE);

 	if(operation == SMIME_VERIFY) {
 		if(!(store = setup_verify(CAfile, CApath))) goto end;
 	}

 	ret = 3;

 	if(operation == SMIME_ENCRYPT) {
 		p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 	} else if(operation == SMIME_SIGN) {
 		p7 = PKCS7_sign(signer, key, other, in, flags);
 		BIO_reset(in);
 	} else {
 		if(informat == FORMAT_SMIME)
 			p7 = SMIME_read_PKCS7(in, &indata);
 		else if(informat == FORMAT_PEM)
 			p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 		else if(informat == FORMAT_ASN1)
 			p7 = d2i_PKCS7_bio(in, NULL);
 		else {
 			BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 			goto end;
 		}

 		if(!p7) {
 			BIO_printf(bio_err, "Error reading S/MIME message\n");
 			goto end;
 		}
 		if(contfile) {
 			BIO_free(indata);
 			if(!(indata = BIO_new_file(contfile, "rb"))) {
 				BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 				goto end;
 			}
 		}
 	}

 	if(!p7) {
 		BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 		goto end;
 	}

 	ret = 4;
 	if(operation == SMIME_DECRYPT) {
 		if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 			BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 			goto end;
 		}
 	} else if(operation == SMIME_VERIFY) {
 		STACK_OF(X509) *signers;
 		if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 			BIO_printf(bio_err, "Verification Successful\n");
 		} else {
 			BIO_printf(bio_err, "Verification Failure\n");
 			goto end;
 		}
 		signers = PKCS7_get0_signers(p7, other, flags);
 		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(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;
 }
	/* smime.c */
	/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
	* project 1999.
	*/
	/* ====================================================================
	* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. All advertising materials mentioning features or use of this
	* software must display the following acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* licensing@OpenSSL.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	* OF THE POSSIBILITY OF SUCH DAMAGE.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	/* S/MIME utility function */

	#include <stdio.h>
	#include <string.h>
	#include "apps.h"
	#include <openssl/crypto.h>
	#include <openssl/pem.h>
	#include <openssl/err.h>

	#undef PROG
	#define PROG smime_main
	static X509_STORE setup_verify(char CAfile, char *CApath);
	static int save_certs(char signerfile, STACK_OF(X509) signers);

	#define SMIME_OP 0x10
	#define SMIME_ENCRYPT (1 \| SMIME_OP)
	#define SMIME_DECRYPT 2
	#define SMIME_SIGN (3 \| SMIME_OP)
	#define SMIME_VERIFY 4
	#define SMIME_PK7OUT 5

	int MAIN(int, char **);

	int MAIN(int argc, char **argv)
	{
	int operation = 0;
	int ret = 0;
	char **args;
	char inmode = "r", outmode = "w";
	char infile = NULL, outfile = NULL;
	char signerfile = NULL, recipfile = NULL;
	char certfile = NULL, keyfile = NULL, *contfile=NULL;
	EVP_CIPHER *cipher = NULL;
	PKCS7 *p7 = NULL;
	X509_STORE *store = NULL;
	X509 cert = NULL, recip = NULL, *signer = NULL;
	EVP_PKEY *key = NULL;
	STACK_OF(X509) encerts = NULL, other = NULL;
	BIO in = NULL, out = NULL, *indata = NULL;
	int badarg = 0;
	int flags = PKCS7_DETACHED;
	char to = NULL, from = NULL, *subject = NULL;
	char CAfile = NULL, CApath = NULL;
	char passargin = NULL, passin = NULL;
	char *inrand = NULL;
	int need_rand = 0;
	int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
	args = argv + 1;

	ret = 1;

	while (!badarg && args && args[0] == '-') {
	if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
	else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
	else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
	else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
	else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
	#ifndef NO_DES
	else if (!strcmp (*args, "-des3"))
	cipher = EVP_des_ede3_cbc();
	else if (!strcmp (*args, "-des"))
	cipher = EVP_des_cbc();
	#endif
	#ifndef NO_RC2
	else if (!strcmp (*args, "-rc2-40"))
	cipher = EVP_rc2_40_cbc();
	else if (!strcmp (*args, "-rc2-128"))
	cipher = EVP_rc2_cbc();
	else if (!strcmp (*args, "-rc2-64"))
	cipher = EVP_rc2_64_cbc();
	#endif
	else if (!strcmp (*args, "-text"))
	flags \|= PKCS7_TEXT;
	else if (!strcmp (*args, "-nointern"))
	flags \|= PKCS7_NOINTERN;
	else if (!strcmp (*args, "-noverify"))
	flags \|= PKCS7_NOVERIFY;
	else if (!strcmp (*args, "-nochain"))
	flags \|= PKCS7_NOCHAIN;
	else if (!strcmp (*args, "-nocerts"))
	flags \|= PKCS7_NOCERTS;
	else if (!strcmp (*args, "-noattr"))
	flags \|= PKCS7_NOATTR;
	else if (!strcmp (*args, "-nodetach"))
	flags &= ~PKCS7_DETACHED;
	else if (!strcmp (*args, "-nosmimecap"))
	flags \|= PKCS7_NOSMIMECAP;
	else if (!strcmp (*args, "-binary"))
	flags \|= PKCS7_BINARY;
	else if (!strcmp (*args, "-nosigs"))
	flags \|= PKCS7_NOSIGS;
	else if (!strcmp(*args,"-rand")) {
	if (args[1]) {
	args++;
	inrand = *args;
	} else badarg = 1;
	need_rand = 1;
	} else if (!strcmp(*args,"-passin")) {
	if (args[1]) {
	args++;
	passargin = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-to")) {
	if (args[1]) {
	args++;
	to = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-from")) {
	if (args[1]) {
	args++;
	from = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-subject")) {
	if (args[1]) {
	args++;
	subject = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-signer")) {
	if (args[1]) {
	args++;
	signerfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-recip")) {
	if (args[1]) {
	args++;
	recipfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-inkey")) {
	if (args[1]) {
	args++;
	keyfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-certfile")) {
	if (args[1]) {
	args++;
	certfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-CAfile")) {
	if (args[1]) {
	args++;
	CAfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-CApath")) {
	if (args[1]) {
	args++;
	CApath = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-in")) {
	if (args[1]) {
	args++;
	infile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-inform")) {
	if (args[1]) {
	args++;
	informat = str2fmt(*args);
	} else badarg = 1;
	} else if (!strcmp (*args, "-outform")) {
	if (args[1]) {
	args++;
	outformat = str2fmt(*args);
	} else badarg = 1;
	} else if (!strcmp (*args, "-out")) {
	if (args[1]) {
	args++;
	outfile = *args;
	} else badarg = 1;
	} else if (!strcmp (*args, "-content")) {
	if (args[1]) {
	args++;
	contfile = *args;
	} else badarg = 1;
	} else badarg = 1;
	args++;
	}

	if(operation == SMIME_SIGN) {
	if(!signerfile) {
	BIO_printf(bio_err, "No signer certificate specified\n");
	badarg = 1;
	}
	need_rand = 1;
	} else if(operation == SMIME_DECRYPT) {
	if(!recipfile) {
	BIO_printf(bio_err, "No recipient certificate and key specified\n");
	badarg = 1;
	}
	} else if(operation == SMIME_ENCRYPT) {
	if(!*args) {
	BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
	badarg = 1;
	}
	need_rand = 1;
	} else if(!operation) badarg = 1;

	if (badarg) {
	BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
	BIO_printf (bio_err, "where options are\n");
	BIO_printf (bio_err, "-encrypt encrypt message\n");
	BIO_printf (bio_err, "-decrypt decrypt encrypted message\n");
	BIO_printf (bio_err, "-sign sign message\n");
	BIO_printf (bio_err, "-verify verify signed message\n");
	BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n");
	#ifndef NO_DES
	BIO_printf (bio_err, "-des3 encrypt with triple DES\n");
	BIO_printf (bio_err, "-des encrypt with DES\n");
	#endif
	#ifndef NO_RC2
	BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n");
	BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n");
	BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n");
	#endif
	BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n");
	BIO_printf (bio_err, "-nosigs don't verify message signature\n");
	BIO_printf (bio_err, "-noverify don't verify signers certificate\n");
	BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n");
	BIO_printf (bio_err, "-nodetach use opaque signing\n");
	BIO_printf (bio_err, "-noattr don't include any signed attributes\n");
	BIO_printf (bio_err, "-binary don't translate message to text\n");
	BIO_printf (bio_err, "-certfile file other certificates file\n");
	BIO_printf (bio_err, "-signer file signer certificate file\n");
	BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n");
	BIO_printf (bio_err, "-in file input file\n");
	BIO_printf (bio_err, "-inform arg input format SMIME (default), PEM or DER\n");
	BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n");
	BIO_printf (bio_err, "-out file output file\n");
	BIO_printf (bio_err, "-outform arg output format SMIME (default), PEM or DER\n");
	BIO_printf (bio_err, "-content file supply or override content for detached signature\n");
	BIO_printf (bio_err, "-to addr to address\n");
	BIO_printf (bio_err, "-from ad from address\n");
	BIO_printf (bio_err, "-subject s subject\n");
	BIO_printf (bio_err, "-text include or delete text MIME headers\n");
	BIO_printf (bio_err, "-CApath dir trusted certificates directory\n");
	BIO_printf (bio_err, "-CAfile file trusted certificates file\n");
	BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
	BIO_printf(bio_err, " load the file (or the files in the directory) into\n");
	BIO_printf(bio_err, " the random number generator\n");
	BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n");
	goto end;
	}

	if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
	BIO_printf(bio_err, "Error getting password\n");
	goto end;
	}

	if (need_rand) {
	app_RAND_load_file(NULL, bio_err, (inrand != NULL));
	if (inrand != NULL)
	BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
	app_RAND_load_files(inrand));
	}

	ret = 2;

	if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;

	if(operation & SMIME_OP) {
	if(flags & PKCS7_BINARY) inmode = "rb";
	if(outformat == FORMAT_ASN1) outmode = "wb";
	} else {
	if(flags & PKCS7_BINARY) outmode = "wb";
	if(informat == FORMAT_ASN1) inmode = "rb";
	}

	if(operation == SMIME_ENCRYPT) {
	if (!cipher) {
	#ifndef NO_RC2
	cipher = EVP_rc2_40_cbc();
	#else
	BIO_printf(bio_err, "No cipher selected\n");
	goto end;
	#endif
	}
	encerts = sk_X509_new_null();
	while (*args) {
	if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) {
	BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
	goto end;
	}
	sk_X509_push(encerts, cert);
	cert = NULL;
	args++;
	}
	}

	if(signerfile && (operation == SMIME_SIGN)) {
	if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) {
	BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
	goto end;
	}
	}

	if(certfile) {
	if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) {
	BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
	ERR_print_errors(bio_err);
	goto end;
	}
	}

	if(recipfile && (operation == SMIME_DECRYPT)) {
	if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) {
	BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
	ERR_print_errors(bio_err);
	goto end;
	}
	}

	if(operation == SMIME_DECRYPT) {
	if(!keyfile) keyfile = recipfile;
	} else if(operation == SMIME_SIGN) {
	if(!keyfile) keyfile = signerfile;
	} else keyfile = NULL;

	if(keyfile) {
	if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) {
	BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
	ERR_print_errors(bio_err);
	goto end;
	}
	}

	if (infile) {
	if (!(in = BIO_new_file(infile, inmode))) {
	BIO_printf (bio_err,
	"Can't open input file %s\n", infile);
	goto end;
	}
	} else in = BIO_new_fp(stdin, BIO_NOCLOSE);

	if (outfile) {
	if (!(out = BIO_new_file(outfile, outmode))) {
	BIO_printf (bio_err,
	"Can't open output file %s\n", outfile);
	goto end;
	}
	} else out = BIO_new_fp(stdout, BIO_NOCLOSE);

	if(operation == SMIME_VERIFY) {
	if(!(store = setup_verify(CAfile, CApath))) goto end;
	}

	ret = 3;

	if(operation == SMIME_ENCRYPT) {
	p7 = PKCS7_encrypt(encerts, in, cipher, flags);
	} else if(operation == SMIME_SIGN) {
	p7 = PKCS7_sign(signer, key, other, in, flags);
	BIO_reset(in);
	} else {
	if(informat == FORMAT_SMIME)
	p7 = SMIME_read_PKCS7(in, &indata);
	else if(informat == FORMAT_PEM)
	p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
	else if(informat == FORMAT_ASN1)
	p7 = d2i_PKCS7_bio(in, NULL);
	else {
	BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
	goto end;
	}

	if(!p7) {
	BIO_printf(bio_err, "Error reading S/MIME message\n");
	goto end;
	}
	if(contfile) {
	BIO_free(indata);
	if(!(indata = BIO_new_file(contfile, "rb"))) {
	BIO_printf(bio_err, "Can't read content file %s\n", contfile);
	goto end;
	}
	}
	}

	if(!p7) {
	BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
	goto end;
	}

	ret = 4;
	if(operation == SMIME_DECRYPT) {
	if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
	BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
	goto end;
	}
	} else if(operation == SMIME_VERIFY) {
	STACK_OF(X509) *signers;
	if(PKCS7_verify(p7, other, store, indata, out, flags)) {
	BIO_printf(bio_err, "Verification Successful\n");
	} else {
	BIO_printf(bio_err, "Verification Failure\n");
	goto end;
	}
	signers = PKCS7_get0_signers(p7, other, flags);
	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(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;
	}