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      1 /* smime.c */
      2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      3  * project.
      4  */
      5 /* ====================================================================
      6  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in
     17  *    the documentation and/or other materials provided with the
     18  *    distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this
     21  *    software must display the following acknowledgment:
     22  *    "This product includes software developed by the OpenSSL Project
     23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     24  *
     25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     26  *    endorse or promote products derived from this software without
     27  *    prior written permission. For written permission, please contact
     28  *    licensing (at) OpenSSL.org.
     29  *
     30  * 5. Products derived from this software may not be called "OpenSSL"
     31  *    nor may "OpenSSL" appear in their names without prior written
     32  *    permission of the OpenSSL Project.
     33  *
     34  * 6. Redistributions of any form whatsoever must retain the following
     35  *    acknowledgment:
     36  *    "This product includes software developed by the OpenSSL Project
     37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     38  *
     39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     50  * OF THE POSSIBILITY OF SUCH DAMAGE.
     51  * ====================================================================
     52  *
     53  * This product includes cryptographic software written by Eric Young
     54  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     55  * Hudson (tjh (at) cryptsoft.com).
     56  *
     57  */
     58 
     59 /* S/MIME utility function */
     60 
     61 #include <stdio.h>
     62 #include <string.h>
     63 #include "apps.h"
     64 #include <openssl/crypto.h>
     65 #include <openssl/pem.h>
     66 #include <openssl/err.h>
     67 #include <openssl/x509_vfy.h>
     68 #include <openssl/x509v3.h>
     69 
     70 #undef PROG
     71 #define PROG smime_main
     72 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
     73 static int smime_cb(int ok, X509_STORE_CTX *ctx);
     74 
     75 #define SMIME_OP	0x10
     76 #define SMIME_IP	0x20
     77 #define SMIME_SIGNERS	0x40
     78 #define SMIME_ENCRYPT	(1 | SMIME_OP)
     79 #define SMIME_DECRYPT	(2 | SMIME_IP)
     80 #define SMIME_SIGN	(3 | SMIME_OP | SMIME_SIGNERS)
     81 #define SMIME_VERIFY	(4 | SMIME_IP)
     82 #define SMIME_PK7OUT	(5 | SMIME_IP | SMIME_OP)
     83 #define SMIME_RESIGN	(6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
     84 
     85 int MAIN(int, char **);
     86 
     87 int MAIN(int argc, char **argv)
     88 	{
     89 	ENGINE *e = NULL;
     90 	int operation = 0;
     91 	int ret = 0;
     92 	char **args;
     93 	const char *inmode = "r", *outmode = "w";
     94 	char *infile = NULL, *outfile = NULL;
     95 	char *signerfile = NULL, *recipfile = NULL;
     96 	STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
     97 	char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
     98 	const EVP_CIPHER *cipher = NULL;
     99 	PKCS7 *p7 = NULL;
    100 	X509_STORE *store = NULL;
    101 	X509 *cert = NULL, *recip = NULL, *signer = NULL;
    102 	EVP_PKEY *key = NULL;
    103 	STACK_OF(X509) *encerts = NULL, *other = NULL;
    104 	BIO *in = NULL, *out = NULL, *indata = NULL;
    105 	int badarg = 0;
    106 	int flags = PKCS7_DETACHED;
    107 	char *to = NULL, *from = NULL, *subject = NULL;
    108 	char *CAfile = NULL, *CApath = NULL;
    109 	char *passargin = NULL, *passin = NULL;
    110 	char *inrand = NULL;
    111 	int need_rand = 0;
    112 	int indef = 0;
    113 	const EVP_MD *sign_md = NULL;
    114 	int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
    115         int keyform = FORMAT_PEM;
    116 #ifndef OPENSSL_NO_ENGINE
    117 	char *engine=NULL;
    118 #endif
    119 
    120 	X509_VERIFY_PARAM *vpm = NULL;
    121 
    122 	args = argv + 1;
    123 	ret = 1;
    124 
    125 	apps_startup();
    126 
    127 	if (bio_err == NULL)
    128 		{
    129 		if ((bio_err = BIO_new(BIO_s_file())) != NULL)
    130 			BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
    131 		}
    132 
    133 	if (!load_config(bio_err, NULL))
    134 		goto end;
    135 
    136 	while (!badarg && *args && *args[0] == '-')
    137 		{
    138 		if (!strcmp (*args, "-encrypt"))
    139 			operation = SMIME_ENCRYPT;
    140 		else if (!strcmp (*args, "-decrypt"))
    141 			operation = SMIME_DECRYPT;
    142 		else if (!strcmp (*args, "-sign"))
    143 			operation = SMIME_SIGN;
    144 		else if (!strcmp (*args, "-resign"))
    145 			operation = SMIME_RESIGN;
    146 		else if (!strcmp (*args, "-verify"))
    147 			operation = SMIME_VERIFY;
    148 		else if (!strcmp (*args, "-pk7out"))
    149 			operation = SMIME_PK7OUT;
    150 #ifndef OPENSSL_NO_DES
    151 		else if (!strcmp (*args, "-des3"))
    152 				cipher = EVP_des_ede3_cbc();
    153 		else if (!strcmp (*args, "-des"))
    154 				cipher = EVP_des_cbc();
    155 #endif
    156 #ifndef OPENSSL_NO_SEED
    157 		else if (!strcmp (*args, "-seed"))
    158 				cipher = EVP_seed_cbc();
    159 #endif
    160 #ifndef OPENSSL_NO_RC2
    161 		else if (!strcmp (*args, "-rc2-40"))
    162 				cipher = EVP_rc2_40_cbc();
    163 		else if (!strcmp (*args, "-rc2-128"))
    164 				cipher = EVP_rc2_cbc();
    165 		else if (!strcmp (*args, "-rc2-64"))
    166 				cipher = EVP_rc2_64_cbc();
    167 #endif
    168 #ifndef OPENSSL_NO_AES
    169 		else if (!strcmp(*args,"-aes128"))
    170 				cipher = EVP_aes_128_cbc();
    171 		else if (!strcmp(*args,"-aes192"))
    172 				cipher = EVP_aes_192_cbc();
    173 		else if (!strcmp(*args,"-aes256"))
    174 				cipher = EVP_aes_256_cbc();
    175 #endif
    176 #ifndef OPENSSL_NO_CAMELLIA
    177 		else if (!strcmp(*args,"-camellia128"))
    178 				cipher = EVP_camellia_128_cbc();
    179 		else if (!strcmp(*args,"-camellia192"))
    180 				cipher = EVP_camellia_192_cbc();
    181 		else if (!strcmp(*args,"-camellia256"))
    182 				cipher = EVP_camellia_256_cbc();
    183 #endif
    184 		else if (!strcmp (*args, "-text"))
    185 				flags |= PKCS7_TEXT;
    186 		else if (!strcmp (*args, "-nointern"))
    187 				flags |= PKCS7_NOINTERN;
    188 		else if (!strcmp (*args, "-noverify"))
    189 				flags |= PKCS7_NOVERIFY;
    190 		else if (!strcmp (*args, "-nochain"))
    191 				flags |= PKCS7_NOCHAIN;
    192 		else if (!strcmp (*args, "-nocerts"))
    193 				flags |= PKCS7_NOCERTS;
    194 		else if (!strcmp (*args, "-noattr"))
    195 				flags |= PKCS7_NOATTR;
    196 		else if (!strcmp (*args, "-nodetach"))
    197 				flags &= ~PKCS7_DETACHED;
    198 		else if (!strcmp (*args, "-nosmimecap"))
    199 				flags |= PKCS7_NOSMIMECAP;
    200 		else if (!strcmp (*args, "-binary"))
    201 				flags |= PKCS7_BINARY;
    202 		else if (!strcmp (*args, "-nosigs"))
    203 				flags |= PKCS7_NOSIGS;
    204 		else if (!strcmp (*args, "-stream"))
    205 				indef = 1;
    206 		else if (!strcmp (*args, "-indef"))
    207 				indef = 1;
    208 		else if (!strcmp (*args, "-noindef"))
    209 				indef = 0;
    210 		else if (!strcmp (*args, "-nooldmime"))
    211 				flags |= PKCS7_NOOLDMIMETYPE;
    212 		else if (!strcmp (*args, "-crlfeol"))
    213 				flags |= PKCS7_CRLFEOL;
    214 		else if (!strcmp(*args,"-rand"))
    215 			{
    216 			if (!args[1])
    217 				goto argerr;
    218 			args++;
    219 			inrand = *args;
    220 			need_rand = 1;
    221 			}
    222 #ifndef OPENSSL_NO_ENGINE
    223 		else if (!strcmp(*args,"-engine"))
    224 			{
    225 			if (!args[1])
    226 				goto argerr;
    227 			engine = *++args;
    228 			}
    229 #endif
    230 		else if (!strcmp(*args,"-passin"))
    231 			{
    232 			if (!args[1])
    233 				goto argerr;
    234 			passargin = *++args;
    235 			}
    236 		else if (!strcmp (*args, "-to"))
    237 			{
    238 			if (!args[1])
    239 				goto argerr;
    240 			to = *++args;
    241 			}
    242 		else if (!strcmp (*args, "-from"))
    243 			{
    244 			if (!args[1])
    245 				goto argerr;
    246 			from = *++args;
    247 			}
    248 		else if (!strcmp (*args, "-subject"))
    249 			{
    250 			if (!args[1])
    251 				goto argerr;
    252 			subject = *++args;
    253 			}
    254 		else if (!strcmp (*args, "-signer"))
    255 			{
    256 			if (!args[1])
    257 				goto argerr;
    258 			/* If previous -signer argument add signer to list */
    259 
    260 			if (signerfile)
    261 				{
    262 				if (!sksigners)
    263 					sksigners = sk_OPENSSL_STRING_new_null();
    264 				sk_OPENSSL_STRING_push(sksigners, signerfile);
    265 				if (!keyfile)
    266 					keyfile = signerfile;
    267 				if (!skkeys)
    268 					skkeys = sk_OPENSSL_STRING_new_null();
    269 				sk_OPENSSL_STRING_push(skkeys, keyfile);
    270 				keyfile = NULL;
    271 				}
    272 			signerfile = *++args;
    273 			}
    274 		else if (!strcmp (*args, "-recip"))
    275 			{
    276 			if (!args[1])
    277 				goto argerr;
    278 			recipfile = *++args;
    279 			}
    280 		else if (!strcmp (*args, "-md"))
    281 			{
    282 			if (!args[1])
    283 				goto argerr;
    284 			sign_md = EVP_get_digestbyname(*++args);
    285 			if (sign_md == NULL)
    286 				{
    287 				BIO_printf(bio_err, "Unknown digest %s\n",
    288 							*args);
    289 				goto argerr;
    290 				}
    291 			}
    292 		else if (!strcmp (*args, "-inkey"))
    293 			{
    294 			if (!args[1])
    295 				goto argerr;
    296 			/* If previous -inkey arument add signer to list */
    297 			if (keyfile)
    298 				{
    299 				if (!signerfile)
    300 					{
    301 					BIO_puts(bio_err, "Illegal -inkey without -signer\n");
    302 					goto argerr;
    303 					}
    304 				if (!sksigners)
    305 					sksigners = sk_OPENSSL_STRING_new_null();
    306 				sk_OPENSSL_STRING_push(sksigners, signerfile);
    307 				signerfile = NULL;
    308 				if (!skkeys)
    309 					skkeys = sk_OPENSSL_STRING_new_null();
    310 				sk_OPENSSL_STRING_push(skkeys, keyfile);
    311 				}
    312 			keyfile = *++args;
    313 			}
    314 		else if (!strcmp (*args, "-keyform"))
    315 			{
    316 			if (!args[1])
    317 				goto argerr;
    318 			keyform = str2fmt(*++args);
    319 			}
    320 		else if (!strcmp (*args, "-certfile"))
    321 			{
    322 			if (!args[1])
    323 				goto argerr;
    324 			certfile = *++args;
    325 			}
    326 		else if (!strcmp (*args, "-CAfile"))
    327 			{
    328 			if (!args[1])
    329 				goto argerr;
    330 			CAfile = *++args;
    331 			}
    332 		else if (!strcmp (*args, "-CApath"))
    333 			{
    334 			if (!args[1])
    335 				goto argerr;
    336 			CApath = *++args;
    337 			}
    338 		else if (!strcmp (*args, "-in"))
    339 			{
    340 			if (!args[1])
    341 				goto argerr;
    342 			infile = *++args;
    343 			}
    344 		else if (!strcmp (*args, "-inform"))
    345 			{
    346 			if (!args[1])
    347 				goto argerr;
    348 			informat = str2fmt(*++args);
    349 			}
    350 		else if (!strcmp (*args, "-outform"))
    351 			{
    352 			if (!args[1])
    353 				goto argerr;
    354 			outformat = str2fmt(*++args);
    355 			}
    356 		else if (!strcmp (*args, "-out"))
    357 			{
    358 			if (!args[1])
    359 				goto argerr;
    360 			outfile = *++args;
    361 			}
    362 		else if (!strcmp (*args, "-content"))
    363 			{
    364 			if (!args[1])
    365 				goto argerr;
    366 			contfile = *++args;
    367 			}
    368 		else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
    369 			continue;
    370 		else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
    371 			badarg = 1;
    372 		args++;
    373 		}
    374 
    375 	if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners))
    376 		{
    377 		BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
    378 		goto argerr;
    379 		}
    380 
    381 	if (operation & SMIME_SIGNERS)
    382 		{
    383 		/* Check to see if any final signer needs to be appended */
    384 		if (keyfile && !signerfile)
    385 			{
    386 			BIO_puts(bio_err, "Illegal -inkey without -signer\n");
    387 			goto argerr;
    388 			}
    389 		if (signerfile)
    390 			{
    391 			if (!sksigners)
    392 				sksigners = sk_OPENSSL_STRING_new_null();
    393 			sk_OPENSSL_STRING_push(sksigners, signerfile);
    394 			if (!skkeys)
    395 				skkeys = sk_OPENSSL_STRING_new_null();
    396 			if (!keyfile)
    397 				keyfile = signerfile;
    398 			sk_OPENSSL_STRING_push(skkeys, keyfile);
    399 			}
    400 		if (!sksigners)
    401 			{
    402 			BIO_printf(bio_err, "No signer certificate specified\n");
    403 			badarg = 1;
    404 			}
    405 		signerfile = NULL;
    406 		keyfile = NULL;
    407 		need_rand = 1;
    408 		}
    409 	else if (operation == SMIME_DECRYPT)
    410 		{
    411 		if (!recipfile && !keyfile)
    412 			{
    413 			BIO_printf(bio_err, "No recipient certificate or key specified\n");
    414 			badarg = 1;
    415 			}
    416 		}
    417 	else if (operation == SMIME_ENCRYPT)
    418 		{
    419 		if (!*args)
    420 			{
    421 			BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
    422 			badarg = 1;
    423 			}
    424 		need_rand = 1;
    425 		}
    426 	else if (!operation)
    427 		badarg = 1;
    428 
    429 	if (badarg)
    430 		{
    431 		argerr:
    432 		BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
    433 		BIO_printf (bio_err, "where options are\n");
    434 		BIO_printf (bio_err, "-encrypt       encrypt message\n");
    435 		BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
    436 		BIO_printf (bio_err, "-sign          sign message\n");
    437 		BIO_printf (bio_err, "-verify        verify signed message\n");
    438 		BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
    439 #ifndef OPENSSL_NO_DES
    440 		BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
    441 		BIO_printf (bio_err, "-des           encrypt with DES\n");
    442 #endif
    443 #ifndef OPENSSL_NO_SEED
    444 		BIO_printf (bio_err, "-seed          encrypt with SEED\n");
    445 #endif
    446 #ifndef OPENSSL_NO_RC2
    447 		BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
    448 		BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
    449 		BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
    450 #endif
    451 #ifndef OPENSSL_NO_AES
    452 		BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
    453 		BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
    454 #endif
    455 #ifndef OPENSSL_NO_CAMELLIA
    456 		BIO_printf (bio_err, "-camellia128, -camellia192, -camellia256\n");
    457 		BIO_printf (bio_err, "               encrypt PEM output with cbc camellia\n");
    458 #endif
    459 		BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
    460 		BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
    461 		BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
    462 		BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
    463 		BIO_printf (bio_err, "-nodetach      use opaque signing\n");
    464 		BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
    465 		BIO_printf (bio_err, "-binary        don't translate message to text\n");
    466 		BIO_printf (bio_err, "-certfile file other certificates file\n");
    467 		BIO_printf (bio_err, "-signer file   signer certificate file\n");
    468 		BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
    469 		BIO_printf (bio_err, "-in file       input file\n");
    470 		BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
    471 		BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
    472 		BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
    473 		BIO_printf (bio_err, "-out file      output file\n");
    474 		BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
    475 		BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
    476 		BIO_printf (bio_err, "-to addr       to address\n");
    477 		BIO_printf (bio_err, "-from ad       from address\n");
    478 		BIO_printf (bio_err, "-subject s     subject\n");
    479 		BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
    480 		BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
    481 		BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
    482 		BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
    483 		BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
    484 #ifndef OPENSSL_NO_ENGINE
    485 		BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
    486 #endif
    487 		BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
    488 		BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
    489 		BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
    490 		BIO_printf(bio_err,  "               the random number generator\n");
    491 		BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
    492 		goto end;
    493 		}
    494 
    495 #ifndef OPENSSL_NO_ENGINE
    496         e = setup_engine(bio_err, engine, 0);
    497 #endif
    498 
    499 	if (!app_passwd(bio_err, passargin, NULL, &passin, NULL))
    500 		{
    501 		BIO_printf(bio_err, "Error getting password\n");
    502 		goto end;
    503 		}
    504 
    505 	if (need_rand)
    506 		{
    507 		app_RAND_load_file(NULL, bio_err, (inrand != NULL));
    508 		if (inrand != NULL)
    509 			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
    510 				app_RAND_load_files(inrand));
    511 		}
    512 
    513 	ret = 2;
    514 
    515 	if (!(operation & SMIME_SIGNERS))
    516 		flags &= ~PKCS7_DETACHED;
    517 
    518 	if (operation & SMIME_OP)
    519 		{
    520 		if (outformat == FORMAT_ASN1)
    521 			outmode = "wb";
    522 		}
    523 	else
    524 		{
    525 		if (flags & PKCS7_BINARY)
    526 			outmode = "wb";
    527 		}
    528 
    529 	if (operation & SMIME_IP)
    530 		{
    531 		if (informat == FORMAT_ASN1)
    532 			inmode = "rb";
    533 		}
    534 	else
    535 		{
    536 		if (flags & PKCS7_BINARY)
    537 			inmode = "rb";
    538 		}
    539 
    540 	if (operation == SMIME_ENCRYPT)
    541 		{
    542 		if (!cipher)
    543 			{
    544 #ifndef OPENSSL_NO_RC2
    545 			cipher = EVP_rc2_40_cbc();
    546 #else
    547 			BIO_printf(bio_err, "No cipher selected\n");
    548 			goto end;
    549 #endif
    550 			}
    551 		encerts = sk_X509_new_null();
    552 		while (*args)
    553 			{
    554 			if (!(cert = load_cert(bio_err,*args,FORMAT_PEM,
    555 				NULL, e, "recipient certificate file")))
    556 				{
    557 #if 0				/* An appropriate message is already printed */
    558 				BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
    559 #endif
    560 				goto end;
    561 				}
    562 			sk_X509_push(encerts, cert);
    563 			cert = NULL;
    564 			args++;
    565 			}
    566 		}
    567 
    568 	if (certfile)
    569 		{
    570 		if (!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
    571 			e, "certificate file")))
    572 			{
    573 			ERR_print_errors(bio_err);
    574 			goto end;
    575 			}
    576 		}
    577 
    578 	if (recipfile && (operation == SMIME_DECRYPT))
    579 		{
    580 		if (!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
    581 			e, "recipient certificate file")))
    582 			{
    583 			ERR_print_errors(bio_err);
    584 			goto end;
    585 			}
    586 		}
    587 
    588 	if (operation == SMIME_DECRYPT)
    589 		{
    590 		if (!keyfile)
    591 			keyfile = recipfile;
    592 		}
    593 	else if (operation == SMIME_SIGN)
    594 		{
    595 		if (!keyfile)
    596 			keyfile = signerfile;
    597 		}
    598 	else keyfile = NULL;
    599 
    600 	if (keyfile)
    601 		{
    602 		key = load_key(bio_err, keyfile, keyform, 0, passin, e,
    603 			       "signing key file");
    604 		if (!key)
    605 			goto end;
    606 		}
    607 
    608 	if (infile)
    609 		{
    610 		if (!(in = BIO_new_file(infile, inmode)))
    611 			{
    612 			BIO_printf (bio_err,
    613 				 "Can't open input file %s\n", infile);
    614 			goto end;
    615 			}
    616 		}
    617 	else
    618 		in = BIO_new_fp(stdin, BIO_NOCLOSE);
    619 
    620 	if (operation & SMIME_IP)
    621 		{
    622 		if (informat == FORMAT_SMIME)
    623 			p7 = SMIME_read_PKCS7(in, &indata);
    624 		else if (informat == FORMAT_PEM)
    625 			p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
    626 		else if (informat == FORMAT_ASN1)
    627 			p7 = d2i_PKCS7_bio(in, NULL);
    628 		else
    629 			{
    630 			BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
    631 			goto end;
    632 			}
    633 
    634 		if (!p7)
    635 			{
    636 			BIO_printf(bio_err, "Error reading S/MIME message\n");
    637 			goto end;
    638 			}
    639 		if (contfile)
    640 			{
    641 			BIO_free(indata);
    642 			if (!(indata = BIO_new_file(contfile, "rb")))
    643 				{
    644 				BIO_printf(bio_err, "Can't read content file %s\n", contfile);
    645 				goto end;
    646 				}
    647 			}
    648 		}
    649 
    650 	if (outfile)
    651 		{
    652 		if (!(out = BIO_new_file(outfile, outmode)))
    653 			{
    654 			BIO_printf (bio_err,
    655 				 "Can't open output file %s\n", outfile);
    656 			goto end;
    657 			}
    658 		}
    659 	else
    660 		{
    661 		out = BIO_new_fp(stdout, BIO_NOCLOSE);
    662 #ifdef OPENSSL_SYS_VMS
    663 		{
    664 		    BIO *tmpbio = BIO_new(BIO_f_linebuffer());
    665 		    out = BIO_push(tmpbio, out);
    666 		}
    667 #endif
    668 		}
    669 
    670 	if (operation == SMIME_VERIFY)
    671 		{
    672 		if (!(store = setup_verify(bio_err, CAfile, CApath)))
    673 			goto end;
    674 		X509_STORE_set_verify_cb(store, smime_cb);
    675 		if (vpm)
    676 			X509_STORE_set1_param(store, vpm);
    677 		}
    678 
    679 
    680 	ret = 3;
    681 
    682 	if (operation == SMIME_ENCRYPT)
    683 		{
    684 		if (indef)
    685 			flags |= PKCS7_STREAM;
    686 		p7 = PKCS7_encrypt(encerts, in, cipher, flags);
    687 		}
    688 	else if (operation & SMIME_SIGNERS)
    689 		{
    690 		int i;
    691 		/* If detached data content we only enable streaming if
    692 		 * S/MIME output format.
    693 		 */
    694 		if (operation == SMIME_SIGN)
    695 			{
    696 			if (flags & PKCS7_DETACHED)
    697 				{
    698 				if (outformat == FORMAT_SMIME)
    699 					flags |= PKCS7_STREAM;
    700 				}
    701 			else if (indef)
    702 				flags |= PKCS7_STREAM;
    703 			flags |= PKCS7_PARTIAL;
    704 			p7 = PKCS7_sign(NULL, NULL, other, in, flags);
    705 			if (!p7)
    706 				goto end;
    707 			}
    708 		else
    709 			flags |= PKCS7_REUSE_DIGEST;
    710 		for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++)
    711 			{
    712 			signerfile = sk_OPENSSL_STRING_value(sksigners, i);
    713 			keyfile = sk_OPENSSL_STRING_value(skkeys, i);
    714 			signer = load_cert(bio_err, signerfile,FORMAT_PEM, NULL,
    715 					e, "signer certificate");
    716 			if (!signer)
    717 				goto end;
    718 			key = load_key(bio_err, keyfile, keyform, 0, passin, e,
    719 			       "signing key file");
    720 			if (!key)
    721 				goto end;
    722 			if (!PKCS7_sign_add_signer(p7, signer, key,
    723 						sign_md, flags))
    724 				goto end;
    725 			X509_free(signer);
    726 			signer = NULL;
    727 			EVP_PKEY_free(key);
    728 			key = NULL;
    729 			}
    730 		/* If not streaming or resigning finalize structure */
    731 		if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM))
    732 			{
    733 			if (!PKCS7_final(p7, in, flags))
    734 				goto end;
    735 			}
    736 		}
    737 
    738 	if (!p7)
    739 		{
    740 		BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
    741 		goto end;
    742 		}
    743 
    744 	ret = 4;
    745 	if (operation == SMIME_DECRYPT)
    746 		{
    747 		if (!PKCS7_decrypt(p7, key, recip, out, flags))
    748 			{
    749 			BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
    750 			goto end;
    751 			}
    752 		}
    753 	else if (operation == SMIME_VERIFY)
    754 		{
    755 		STACK_OF(X509) *signers;
    756 		if (PKCS7_verify(p7, other, store, indata, out, flags))
    757 			BIO_printf(bio_err, "Verification successful\n");
    758 		else
    759 			{
    760 			BIO_printf(bio_err, "Verification failure\n");
    761 			goto end;
    762 			}
    763 		signers = PKCS7_get0_signers(p7, other, flags);
    764 		if (!save_certs(signerfile, signers))
    765 			{
    766 			BIO_printf(bio_err, "Error writing signers to %s\n",
    767 								signerfile);
    768 			ret = 5;
    769 			goto end;
    770 			}
    771 		sk_X509_free(signers);
    772 		}
    773 	else if (operation == SMIME_PK7OUT)
    774 		PEM_write_bio_PKCS7(out, p7);
    775 	else
    776 		{
    777 		if (to)
    778 			BIO_printf(out, "To: %s\n", to);
    779 		if (from)
    780 			BIO_printf(out, "From: %s\n", from);
    781 		if (subject)
    782 			BIO_printf(out, "Subject: %s\n", subject);
    783 		if (outformat == FORMAT_SMIME)
    784 			{
    785 			if (operation == SMIME_RESIGN)
    786 				SMIME_write_PKCS7(out, p7, indata, flags);
    787 			else
    788 				SMIME_write_PKCS7(out, p7, in, flags);
    789 			}
    790 		else if (outformat == FORMAT_PEM)
    791 			PEM_write_bio_PKCS7_stream(out, p7, in, flags);
    792 		else if (outformat == FORMAT_ASN1)
    793 			i2d_PKCS7_bio_stream(out,p7, in, flags);
    794 		else
    795 			{
    796 			BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
    797 			goto end;
    798 			}
    799 		}
    800 	ret = 0;
    801 end:
    802 	if (need_rand)
    803 		app_RAND_write_file(NULL, bio_err);
    804 	if (ret) ERR_print_errors(bio_err);
    805 	sk_X509_pop_free(encerts, X509_free);
    806 	sk_X509_pop_free(other, X509_free);
    807 	if (vpm)
    808 		X509_VERIFY_PARAM_free(vpm);
    809 	if (sksigners)
    810 		sk_OPENSSL_STRING_free(sksigners);
    811 	if (skkeys)
    812 		sk_OPENSSL_STRING_free(skkeys);
    813 	X509_STORE_free(store);
    814 	X509_free(cert);
    815 	X509_free(recip);
    816 	X509_free(signer);
    817 	EVP_PKEY_free(key);
    818 	PKCS7_free(p7);
    819 	BIO_free(in);
    820 	BIO_free(indata);
    821 	BIO_free_all(out);
    822 	if (passin) OPENSSL_free(passin);
    823 	return (ret);
    824 }
    825 
    826 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
    827 	{
    828 	int i;
    829 	BIO *tmp;
    830 	if (!signerfile)
    831 		return 1;
    832 	tmp = BIO_new_file(signerfile, "w");
    833 	if (!tmp) return 0;
    834 	for(i = 0; i < sk_X509_num(signers); i++)
    835 		PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
    836 	BIO_free(tmp);
    837 	return 1;
    838 	}
    839 
    840 
    841 /* Minimal callback just to output policy info (if any) */
    842 
    843 static int smime_cb(int ok, X509_STORE_CTX *ctx)
    844 	{
    845 	int error;
    846 
    847 	error = X509_STORE_CTX_get_error(ctx);
    848 
    849 	if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
    850 		&& ((error != X509_V_OK) || (ok != 2)))
    851 		return ok;
    852 
    853 	policies_print(NULL, ctx);
    854 
    855 	return ok;
    856 
    857 	}
    858