/* $OpenBSD: cms.c,v 1.17 2020/01/04 14:17:55 inoguchi Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 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.
 * ====================================================================
 */

/* CMS utility function */

#include <stdio.h>
#include <string.h>

#include "apps.h"

#ifndef OPENSSL_NO_CMS

#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509_vfy.h>
#include <openssl/x509v3.h>

#include <openssl/cms.h>

static int save_certs(char *signerfile, STACK_OF(X509) *signers);
static int cms_cb(int ok, X509_STORE_CTX *ctx);
static void receipt_request_print(BIO *out, CMS_ContentInfo *cms);
static CMS_ReceiptRequest *make_receipt_request(
    STACK_OF(OPENSSL_STRING) *rr_to, int rr_allorfirst,
    STACK_OF(OPENSSL_STRING) *rr_from);
static int cms_set_pkey_param(EVP_PKEY_CTX *pctx,
    STACK_OF(OPENSSL_STRING) *param);

#define SMIME_OP	0x10
#define SMIME_IP	0x20
#define SMIME_SIGNERS	0x40
#define SMIME_ENCRYPT		(1 | SMIME_OP)
#define SMIME_DECRYPT		(2 | SMIME_IP)
#define SMIME_SIGN		(3 | SMIME_OP | SMIME_SIGNERS)
#define SMIME_VERIFY		(4 | SMIME_IP)
#define SMIME_CMSOUT		(5 | SMIME_IP | SMIME_OP)
#define SMIME_RESIGN		(6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
#define SMIME_DATAOUT		(7 | SMIME_IP)
#define SMIME_DATA_CREATE	(8 | SMIME_OP)
#define SMIME_DIGEST_VERIFY	(9 | SMIME_IP)
#define SMIME_DIGEST_CREATE	(10 | SMIME_OP)
#define SMIME_UNCOMPRESS	(11 | SMIME_IP)
#define SMIME_COMPRESS		(12 | SMIME_OP)
#define SMIME_ENCRYPTED_DECRYPT	(13 | SMIME_IP)
#define SMIME_ENCRYPTED_ENCRYPT	(14 | SMIME_OP)
#define SMIME_SIGN_RECEIPT	(15 | SMIME_IP | SMIME_OP)
#define SMIME_VERIFY_RECEIPT	(16 | SMIME_IP)

int verify_err = 0;

struct cms_key_param {
	int idx;
	STACK_OF(OPENSSL_STRING) *param;
	struct cms_key_param *next;
};

int
cms_main(int argc, char **argv)
{
	int operation = 0;
	int ret = 0;
	char **args;
	const char *inmode = "r", *outmode = "w";
	char *infile = NULL, *outfile = NULL, *rctfile = NULL;
	char *signerfile = NULL, *recipfile = NULL;
	STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
	char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
	char *certsoutfile = NULL;
	const EVP_CIPHER *cipher = NULL;
	CMS_ContentInfo *cms = NULL, *rcms = 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, *rctin = NULL;
	int badarg = 0;
	int flags = CMS_DETACHED, noout = 0, print = 0;
	int verify_retcode = 0;
	int rr_print = 0, rr_allorfirst = -1;
	STACK_OF(OPENSSL_STRING) *rr_to = NULL, *rr_from = NULL;
	CMS_ReceiptRequest *rr = NULL;
	char *to = NULL, *from = NULL, *subject = NULL;
	char *CAfile = NULL, *CApath = NULL;
	char *passargin = NULL, *passin = NULL;
	const EVP_MD *sign_md = NULL;
	int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
	int rctformat = FORMAT_SMIME, keyform = FORMAT_PEM;
	unsigned char *secret_key = NULL, *secret_keyid = NULL;
	unsigned char *pwri_pass = NULL, *pwri_tmp = NULL;
	size_t secret_keylen = 0, secret_keyidlen = 0;

	struct cms_key_param *key_first = NULL, *key_param = NULL;

	ASN1_OBJECT *econtent_type = NULL;

	X509_VERIFY_PARAM *vpm = NULL;

	if (single_execution) {
		if (pledge("stdio rpath wpath cpath tty", NULL) == -1) {
			perror("pledge");
			exit(1);
		}
	}

	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, "-sign_receipt"))
			operation = SMIME_SIGN_RECEIPT;
		else if (!strcmp(*args, "-resign"))
			operation = SMIME_RESIGN;
		else if (!strcmp(*args, "-verify"))
			operation = SMIME_VERIFY;
		else if (!strcmp(*args, "-verify_retcode"))
			verify_retcode = 1;
		else if (!strcmp(*args, "-verify_receipt")) {
			operation = SMIME_VERIFY_RECEIPT;
			if (!args[1])
				goto argerr;
			args++;
			rctfile = *args;
		} else if (!strcmp(*args, "-cmsout"))
			operation = SMIME_CMSOUT;
		else if (!strcmp(*args, "-data_out"))
			operation = SMIME_DATAOUT;
		else if (!strcmp(*args, "-data_create"))
			operation = SMIME_DATA_CREATE;
		else if (!strcmp(*args, "-digest_verify"))
			operation = SMIME_DIGEST_VERIFY;
		else if (!strcmp(*args, "-digest_create"))
			operation = SMIME_DIGEST_CREATE;
		else if (!strcmp(*args, "-compress"))
			operation = SMIME_COMPRESS;
		else if (!strcmp(*args, "-uncompress"))
			operation = SMIME_UNCOMPRESS;
		else if (!strcmp(*args, "-EncryptedData_decrypt"))
			operation = SMIME_ENCRYPTED_DECRYPT;
		else if (!strcmp(*args, "-EncryptedData_encrypt"))
			operation = SMIME_ENCRYPTED_ENCRYPT;
#ifndef OPENSSL_NO_DES
		else if (!strcmp(*args, "-des3"))
			cipher = EVP_des_ede3_cbc();
		else if (!strcmp(*args, "-des"))
			cipher = EVP_des_cbc();
#endif
#ifndef OPENSSL_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
#ifndef OPENSSL_NO_AES
		else if (!strcmp(*args, "-aes128"))
			cipher = EVP_aes_128_cbc();
		else if (!strcmp(*args, "-aes192"))
			cipher = EVP_aes_192_cbc();
		else if (!strcmp(*args, "-aes256"))
			cipher = EVP_aes_256_cbc();
#endif
#ifndef OPENSSL_NO_CAMELLIA
		else if (!strcmp(*args, "-camellia128"))
			cipher = EVP_camellia_128_cbc();
		else if (!strcmp(*args, "-camellia192"))
			cipher = EVP_camellia_192_cbc();
		else if (!strcmp(*args, "-camellia256"))
			cipher = EVP_camellia_256_cbc();
#endif
		else if (!strcmp(*args, "-debug_decrypt"))
			flags |= CMS_DEBUG_DECRYPT;
		else if (!strcmp(*args, "-text"))
			flags |= CMS_TEXT;
		else if (!strcmp(*args, "-nointern"))
			flags |= CMS_NOINTERN;
		else if (!strcmp(*args, "-noverify") ||
		    !strcmp(*args, "-no_signer_cert_verify"))
			flags |= CMS_NO_SIGNER_CERT_VERIFY;
		else if (!strcmp(*args, "-nocerts"))
			flags |= CMS_NOCERTS;
		else if (!strcmp(*args, "-noattr"))
			flags |= CMS_NOATTR;
		else if (!strcmp(*args, "-nodetach"))
			flags &= ~CMS_DETACHED;
		else if (!strcmp(*args, "-nosmimecap"))
			flags |= CMS_NOSMIMECAP;
		else if (!strcmp(*args, "-binary"))
			flags |= CMS_BINARY;
		else if (!strcmp(*args, "-keyid"))
			flags |= CMS_USE_KEYID;
		else if (!strcmp(*args, "-nosigs"))
			flags |= CMS_NOSIGS;
		else if (!strcmp(*args, "-no_content_verify"))
			flags |= CMS_NO_CONTENT_VERIFY;
		else if (!strcmp(*args, "-no_attr_verify"))
			flags |= CMS_NO_ATTR_VERIFY;
		else if (!strcmp(*args, "-stream"))
			flags |= CMS_STREAM;
		else if (!strcmp(*args, "-indef"))
			flags |= CMS_STREAM;
		else if (!strcmp(*args, "-noindef"))
			flags &= ~CMS_STREAM;
		else if (!strcmp(*args, "-nooldmime"))
			flags |= CMS_NOOLDMIMETYPE;
		else if (!strcmp(*args, "-crlfeol"))
			flags |= CMS_CRLFEOL;
		else if (!strcmp(*args, "-noout"))
			noout = 1;
		else if (!strcmp(*args, "-receipt_request_print"))
			rr_print = 1;
		else if (!strcmp(*args, "-receipt_request_all"))
			rr_allorfirst = 0;
		else if (!strcmp(*args, "-receipt_request_first"))
			rr_allorfirst = 1;
		else if (!strcmp(*args, "-receipt_request_from")) {
			if (!args[1])
				goto argerr;
			args++;
			if (rr_from == NULL &&
			    (rr_from = sk_OPENSSL_STRING_new_null()) == NULL)
				goto end;
			if (!sk_OPENSSL_STRING_push(rr_from, *args))
				goto end;
		} else if (!strcmp(*args, "-receipt_request_to")) {
			if (!args[1])
				goto argerr;
			args++;
			if (rr_to == NULL &&
			    (rr_to = sk_OPENSSL_STRING_new_null()) == NULL)
				goto end;
			if (!sk_OPENSSL_STRING_push(rr_to, *args))
				goto end;
		} else if (!strcmp(*args, "-print")) {
			noout = 1;
			print = 1;
		} else if (!strcmp(*args, "-secretkey")) {
			long ltmp;
			if (!args[1])
				goto argerr;
			args++;
			secret_key = string_to_hex(*args, &ltmp);
			if (!secret_key) {
				BIO_printf(bio_err, "Invalid key %s\n", *args);
				goto argerr;
			}
			secret_keylen = (size_t) ltmp;
		} else if (!strcmp(*args, "-secretkeyid")) {
			long ltmp;
			if (!args[1])
				goto argerr;
			args++;
			secret_keyid = string_to_hex(*args, &ltmp);
			if (!secret_keyid) {
				BIO_printf(bio_err, "Invalid id %s\n", *args);
				goto argerr;
			}
			secret_keyidlen = (size_t) ltmp;
		} else if (!strcmp(*args, "-pwri_password")) {
			if (!args[1])
				goto argerr;
			args++;
			pwri_pass = (unsigned char *) *args;
		} else if (!strcmp(*args, "-econtent_type")) {
			if (!args[1])
				goto argerr;
			args++;
			econtent_type = OBJ_txt2obj(*args, 0);
			if (!econtent_type) {
				BIO_printf(bio_err, "Invalid OID %s\n", *args);
				goto argerr;
			}
		}
		else if (!strcmp(*args, "-passin")) {
			if (!args[1])
				goto argerr;
			passargin = *++args;
		} else if (!strcmp(*args, "-to")) {
			if (!args[1])
				goto argerr;
			to = *++args;
		} else if (!strcmp(*args, "-from")) {
			if (!args[1])
				goto argerr;
			from = *++args;
		} else if (!strcmp(*args, "-subject")) {
			if (!args[1])
				goto argerr;
			subject = *++args;
		} else if (!strcmp(*args, "-signer")) {
			if (!args[1])
				goto argerr;
			/* If previous -signer argument add signer to list */

			if (signerfile) {
				if (sksigners == NULL &&
				    (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
					goto end;
				if (!sk_OPENSSL_STRING_push(sksigners, signerfile))
					goto end;
				if (!keyfile)
					keyfile = signerfile;
				if (skkeys == NULL &&
				    (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
					goto end;
				if (!sk_OPENSSL_STRING_push(skkeys, keyfile))
					goto end;
				keyfile = NULL;
			}
			signerfile = *++args;
		} else if (!strcmp(*args, "-recip")) {
			if (!args[1])
				goto argerr;
			if (operation == SMIME_ENCRYPT) {
				if (encerts == NULL &&
				    (encerts = sk_X509_new_null()) == NULL)
					goto end;
				cert = load_cert(bio_err, *++args, FORMAT_PEM,
				    NULL, "recipient certificate file");
				if (cert == NULL)
					goto end;
				if (!sk_X509_push(encerts, cert))
					goto end;
				cert = NULL;
			} else {
				recipfile = *++args;
			}
		} else if (!strcmp(*args, "-certsout")) {
			if (!args[1])
				goto argerr;
			certsoutfile = *++args;
		} else if (!strcmp(*args, "-md")) {
			if (!args[1])
				goto argerr;
			sign_md = EVP_get_digestbyname(*++args);
			if (sign_md == NULL) {
				BIO_printf(bio_err, "Unknown digest %s\n",
				    *args);
				goto argerr;
			}
		} else if (!strcmp(*args, "-inkey")) {
			if (!args[1])
				goto argerr;
			/* If previous -inkey arument add signer to list */
			if (keyfile) {
				if (!signerfile) {
					BIO_puts(bio_err,
					    "Illegal -inkey without -signer\n");
					goto argerr;
				}
				if (sksigners == NULL &&
				    (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
					goto end;
				if (!sk_OPENSSL_STRING_push(sksigners, signerfile))
					goto end;
				signerfile = NULL;
				if (skkeys == NULL &&
				    (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
					goto end;
				if (!sk_OPENSSL_STRING_push(skkeys, keyfile))
					goto end;
			}
			keyfile = *++args;
		} else if (!strcmp(*args, "-keyform")) {
			if (!args[1])
				goto argerr;
			keyform = str2fmt(*++args);
		} else if (!strcmp (*args, "-keyopt")) {
			int keyidx = -1;
			if (!args[1])
				goto argerr;
			if (operation == SMIME_ENCRYPT) {
				if (encerts != NULL)
					keyidx += sk_X509_num(encerts);
			} else {
				if (keyfile != NULL || signerfile != NULL)
					keyidx++;
				if (skkeys != NULL)
					keyidx += sk_OPENSSL_STRING_num(skkeys);
			}
			if (keyidx < 0) {
				BIO_printf(bio_err, "No key specified\n");
				goto argerr;
			}
			if (key_param == NULL || key_param->idx != keyidx) {
				struct cms_key_param *nparam;
				if ((nparam = malloc(sizeof(struct cms_key_param))) == NULL)
					goto end;
				nparam->idx = keyidx;
				if ((nparam->param = sk_OPENSSL_STRING_new_null()) == NULL)
					goto end;
				nparam->next = NULL;
				if (key_first == NULL)
					key_first = nparam;
				else
					key_param->next = nparam;
				key_param = nparam;
			}
			if (!sk_OPENSSL_STRING_push(key_param->param, *++args))
				goto end;
		} else if (!strcmp(*args, "-rctform")) {
			if (!args[1])
				goto argerr;
			rctformat = str2fmt(*++args);
		} else if (!strcmp(*args, "-certfile")) {
			if (!args[1])
				goto argerr;
			certfile = *++args;
		} else if (!strcmp(*args, "-CAfile")) {
			if (!args[1])
				goto argerr;
			CAfile = *++args;
		} else if (!strcmp(*args, "-CApath")) {
			if (!args[1])
				goto argerr;
			CApath = *++args;
		} else if (!strcmp(*args, "-in")) {
			if (!args[1])
				goto argerr;
			infile = *++args;
		} else if (!strcmp(*args, "-inform")) {
			if (!args[1])
				goto argerr;
			informat = str2fmt(*++args);
		} else if (!strcmp(*args, "-outform")) {
			if (!args[1])
				goto argerr;
			outformat = str2fmt(*++args);
		} else if (!strcmp(*args, "-out")) {
			if (!args[1])
				goto argerr;
			outfile = *++args;
		} else if (!strcmp(*args, "-content")) {
			if (!args[1])
				goto argerr;
			contfile = *++args;
		} else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
			continue;
		else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
			badarg = 1;
		args++;
	}

	if (((rr_allorfirst != -1) || rr_from) && !rr_to) {
		BIO_puts(bio_err, "No Signed Receipts Recipients\n");
		goto argerr;
	}
	if (!(operation & SMIME_SIGNERS) && (rr_to || rr_from)) {
		BIO_puts(bio_err, "Signed receipts only allowed with -sign\n");
		goto argerr;
	}
	if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners)) {
		BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
		goto argerr;
	}
	if (operation & SMIME_SIGNERS) {
		if (keyfile && !signerfile) {
			BIO_puts(bio_err, "Illegal -inkey without -signer\n");
			goto argerr;
		}
		/* Check to see if any final signer needs to be appended */
		if (signerfile) {
			if (sksigners == NULL &&
			    (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
				goto end;
			if (!sk_OPENSSL_STRING_push(sksigners, signerfile))
				goto end;
			if (skkeys == NULL &&
			    (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
				goto end;
			if (!keyfile)
				keyfile = signerfile;
			if (!sk_OPENSSL_STRING_push(skkeys, keyfile))
				goto end;
		}
		if (!sksigners) {
			BIO_printf(bio_err,
			    "No signer certificate specified\n");
			badarg = 1;
		}
		signerfile = NULL;
		keyfile = NULL;
	} else if (operation == SMIME_DECRYPT) {
		if (!recipfile && !keyfile && !secret_key && !pwri_pass) {
			BIO_printf(bio_err,
			    "No recipient certificate or key specified\n");
			badarg = 1;
		}
	} else if (operation == SMIME_ENCRYPT) {
		if (!*args && !secret_key && !pwri_pass && !encerts) {
			BIO_printf(bio_err,
			    "No recipient(s) certificate(s) specified\n");
			badarg = 1;
		}
	} else if (!operation)
		badarg = 1;

	if (badarg) {
 argerr:
		BIO_printf(bio_err, "Usage cms [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, "-cmsout        output CMS structure\n");
#ifndef OPENSSL_NO_DES
		BIO_printf(bio_err, "-des3          encrypt with triple DES\n");
		BIO_printf(bio_err, "-des           encrypt with DES\n");
#endif
#ifndef OPENSSL_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
#ifndef OPENSSL_NO_AES
		BIO_printf(bio_err, "-aes128, -aes192, -aes256\n");
		BIO_printf(bio_err, "               encrypt PEM output with cbc aes\n");
#endif
#ifndef OPENSSL_NO_CAMELLIA
		BIO_printf(bio_err, "-camellia128, -camellia192, -camellia256\n");
		BIO_printf(bio_err, "               encrypt PEM output with cbc camellia\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, "-certsout file certificate output 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, "-keyid         use subject key identifier\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, "-keyform arg   input private key format (PEM)\n");
		BIO_printf(bio_err, "-keyopt nm:v   set public key parameters\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, "-crl_check     check revocation status of signer's certificate using CRLs\n");
		BIO_printf(bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
		BIO_printf(bio_err, "-passin arg    input file pass phrase source\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;
	}
	ret = 2;

	if (!(operation & SMIME_SIGNERS))
		flags &= ~CMS_DETACHED;

	if (operation & SMIME_OP) {
		if (outformat == FORMAT_ASN1)
			outmode = "wb";
	} else {
		if (flags & CMS_BINARY)
			outmode = "wb";
	}

	if (operation & SMIME_IP) {
		if (informat == FORMAT_ASN1)
			inmode = "rb";
	} else {
		if (flags & CMS_BINARY)
			inmode = "rb";
	}

	if (operation == SMIME_ENCRYPT) {
		if (!cipher) {
#ifndef OPENSSL_NO_DES
			cipher = EVP_des_ede3_cbc();
#else
			BIO_printf(bio_err, "No cipher selected\n");
			goto end;
#endif
		}
		if (secret_key && !secret_keyid) {
			BIO_printf(bio_err, "No secret key id\n");
			goto end;
		}
		if (*args && encerts == NULL)
			if ((encerts = sk_X509_new_null()) == NULL)
				goto end;
		while (*args) {
			if (!(cert = load_cert(bio_err, *args, FORMAT_PEM,
			    NULL, "recipient certificate file")))
				goto end;
			if (!sk_X509_push(encerts, cert))
				goto end;
			cert = NULL;
			args++;
		}
	}
	if (certfile) {
		if (!(other = load_certs(bio_err, certfile, FORMAT_PEM, NULL,
		    "certificate file"))) {
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if (recipfile && (operation == SMIME_DECRYPT)) {
		if (!(recip = load_cert(bio_err, recipfile, FORMAT_PEM, NULL,
		    "recipient certificate file"))) {
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if (operation == SMIME_SIGN_RECEIPT) {
		if (!(signer = load_cert(bio_err, signerfile, FORMAT_PEM, NULL,
		    "receipt signer certificate file"))) {
			ERR_print_errors(bio_err);
			goto end;
		}
	}
	if (operation == SMIME_DECRYPT) {
		if (!keyfile)
			keyfile = recipfile;
	} else if ((operation == SMIME_SIGN) ||
	    (operation == SMIME_SIGN_RECEIPT)) {
		if (!keyfile)
			keyfile = signerfile;
	} else
		keyfile = NULL;

	if (keyfile) {
		key = load_key(bio_err, keyfile, keyform, 0, passin,
		    "signing key file");
		if (!key)
			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 (operation & SMIME_IP) {
		if (informat == FORMAT_SMIME)
			cms = SMIME_read_CMS(in, &indata);
		else if (informat == FORMAT_PEM)
			cms = PEM_read_bio_CMS(in, NULL, NULL, NULL);
		else if (informat == FORMAT_ASN1)
			cms = d2i_CMS_bio(in, NULL);
		else {
			BIO_printf(bio_err, "Bad input format for CMS file\n");
			goto end;
		}

		if (!cms) {
			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 (certsoutfile) {
			STACK_OF(X509) *allcerts;
			if ((allcerts = CMS_get1_certs(cms)) == NULL)
				goto end;
			if (!save_certs(certsoutfile, allcerts)) {
				BIO_printf(bio_err,
				    "Error writing certs to %s\n",
				    certsoutfile);
				ret = 5;
				goto end;
			}
			sk_X509_pop_free(allcerts, X509_free);
		}
	}
	if (rctfile) {
		char *rctmode = (rctformat == FORMAT_ASN1) ? "rb" : "r";
		if (!(rctin = BIO_new_file(rctfile, rctmode))) {
			BIO_printf(bio_err,
			    "Can't open receipt file %s\n", rctfile);
			goto end;
		}
		if (rctformat == FORMAT_SMIME)
			rcms = SMIME_read_CMS(rctin, NULL);
		else if (rctformat == FORMAT_PEM)
			rcms = PEM_read_bio_CMS(rctin, NULL, NULL, NULL);
		else if (rctformat == FORMAT_ASN1)
			rcms = d2i_CMS_bio(rctin, NULL);
		else {
			BIO_printf(bio_err, "Bad input format for receipt\n");
			goto end;
		}

		if (!rcms) {
			BIO_printf(bio_err, "Error reading receipt\n");
			goto end;
		}
	}
	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) ||
	    (operation == SMIME_VERIFY_RECEIPT)) {
		if (!(store = setup_verify(bio_err, CAfile, CApath)))
			goto end;
		X509_STORE_set_verify_cb(store, cms_cb);
		if (vpm)
			X509_STORE_set1_param(store, vpm);
	}
	ret = 3;

	if (operation == SMIME_DATA_CREATE) {
		cms = CMS_data_create(in, flags);
	} else if (operation == SMIME_DIGEST_CREATE) {
		cms = CMS_digest_create(in, sign_md, flags);
	} else if (operation == SMIME_COMPRESS) {
		cms = CMS_compress(in, -1, flags);
	} else if (operation == SMIME_ENCRYPT) {
		int i;
		flags |= CMS_PARTIAL;
		cms = CMS_encrypt(NULL, in, cipher, flags);
		if (cms == NULL)
			goto end;
		for (i = 0; i < sk_X509_num(encerts); i++) {
			CMS_RecipientInfo *ri;
			struct cms_key_param *kparam;
			int tflags = flags;
			X509 *x = sk_X509_value(encerts, i);
			for (kparam = key_first; kparam; kparam = kparam->next) {
				if (kparam->idx == i) {
					tflags |= CMS_KEY_PARAM;
					break;
				}
			}
			ri = CMS_add1_recipient_cert(cms, x, tflags);
			if (ri == NULL)
				goto end;
			if (kparam != NULL) {
				EVP_PKEY_CTX *pctx;
				if ((pctx = CMS_RecipientInfo_get0_pkey_ctx(ri)) == NULL)
					goto end;
				if (!cms_set_pkey_param(pctx, kparam->param))
					goto end;
			}
		}

		if (secret_key) {
			if (!CMS_add0_recipient_key(cms, NID_undef, secret_key,
			    secret_keylen, secret_keyid, secret_keyidlen,
			    NULL, NULL, NULL))
				goto end;
			/* NULL these because call absorbs them */
			secret_key = NULL;
			secret_keyid = NULL;
		}
		if (pwri_pass) {
			pwri_tmp = strdup(pwri_pass);
			if (!pwri_tmp)
				goto end;
			if (!CMS_add0_recipient_password(cms, -1, NID_undef,
			    NID_undef, pwri_tmp, -1, NULL))
				goto end;
			pwri_tmp = NULL;
		}
		if (!(flags & CMS_STREAM)) {
			if (!CMS_final(cms, in, NULL, flags))
				goto end;
		}
	} else if (operation == SMIME_ENCRYPTED_ENCRYPT) {
		cms = CMS_EncryptedData_encrypt(in, cipher, secret_key,
		    secret_keylen, flags);

	} else if (operation == SMIME_SIGN_RECEIPT) {
		CMS_ContentInfo *srcms = NULL;
		STACK_OF(CMS_SignerInfo) *sis;
		CMS_SignerInfo *si;
		sis = CMS_get0_SignerInfos(cms);
		if (!sis)
			goto end;
		si = sk_CMS_SignerInfo_value(sis, 0);
		srcms = CMS_sign_receipt(si, signer, key, other, flags);
		if (!srcms)
			goto end;
		CMS_ContentInfo_free(cms);
		cms = srcms;
	} else if (operation & SMIME_SIGNERS) {
		int i;
		/*
		 * If detached data content we enable streaming if S/MIME
		 * output format.
		 */
		if (operation == SMIME_SIGN) {

			if (flags & CMS_DETACHED) {
				if (outformat == FORMAT_SMIME)
					flags |= CMS_STREAM;
			}
			flags |= CMS_PARTIAL;
			cms = CMS_sign(NULL, NULL, other, in, flags);
			if (!cms)
				goto end;
			if (econtent_type)
				if (!CMS_set1_eContentType(cms, econtent_type))
					goto end;

			if (rr_to) {
				rr = make_receipt_request(rr_to, rr_allorfirst,
				    rr_from);
				if (!rr) {
					BIO_puts(bio_err,
					    "Signed Receipt Request Creation Error\n");
					goto end;
				}
			}
		} else
			flags |= CMS_REUSE_DIGEST;
		for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
			CMS_SignerInfo *si;
			struct cms_key_param *kparam;
			int tflags = flags;
			signerfile = sk_OPENSSL_STRING_value(sksigners, i);
			keyfile = sk_OPENSSL_STRING_value(skkeys, i);

			signer = load_cert(bio_err, signerfile, FORMAT_PEM,
			    NULL, "signer certificate");
			if (!signer)
				goto end;
			key = load_key(bio_err, keyfile, keyform, 0, passin,
			    "signing key file");
			if (!key)
				goto end;
			for (kparam = key_first; kparam; kparam = kparam->next) {
				if (kparam->idx == i) {
					tflags |= CMS_KEY_PARAM;
					break;
				}
			}
			si = CMS_add1_signer(cms, signer, key, sign_md, tflags);
			if (si == NULL)
				goto end;
			if (kparam != NULL) {
				EVP_PKEY_CTX *pctx;
				if ((pctx = CMS_SignerInfo_get0_pkey_ctx(si)) == NULL)
					goto end;
				if (!cms_set_pkey_param(pctx, kparam->param))
					goto end;
			}
			if (rr && !CMS_add1_ReceiptRequest(si, rr))
				goto end;
			X509_free(signer);
			signer = NULL;
			EVP_PKEY_free(key);
			key = NULL;
		}
		/* If not streaming or resigning finalize structure */
		if ((operation == SMIME_SIGN) && !(flags & CMS_STREAM)) {
			if (!CMS_final(cms, in, NULL, flags))
				goto end;
		}
	}
	if (!cms) {
		BIO_printf(bio_err, "Error creating CMS structure\n");
		goto end;
	}
	ret = 4;
	if (operation == SMIME_DECRYPT) {
		if (flags & CMS_DEBUG_DECRYPT)
			CMS_decrypt(cms, NULL, NULL, NULL, NULL, flags);

		if (secret_key) {
			if (!CMS_decrypt_set1_key(cms, secret_key,
			    secret_keylen, secret_keyid, secret_keyidlen)) {
				BIO_puts(bio_err,
				    "Error decrypting CMS using secret key\n");
				goto end;
			}
		}
		if (key) {
			if (!CMS_decrypt_set1_pkey(cms, key, recip)) {
				BIO_puts(bio_err,
				    "Error decrypting CMS using private key\n");
				goto end;
			}
		}
		if (pwri_pass) {
			if (!CMS_decrypt_set1_password(cms, pwri_pass, -1)) {
				BIO_puts(bio_err,
				    "Error decrypting CMS using password\n");
				goto end;
			}
		}
		if (!CMS_decrypt(cms, NULL, NULL, indata, out, flags)) {
			BIO_printf(bio_err, "Error decrypting CMS structure\n");
			goto end;
		}
	} else if (operation == SMIME_DATAOUT) {
		if (!CMS_data(cms, out, flags))
			goto end;
	} else if (operation == SMIME_UNCOMPRESS) {
		if (!CMS_uncompress(cms, indata, out, flags))
			goto end;
	} else if (operation == SMIME_DIGEST_VERIFY) {
		if (CMS_digest_verify(cms, indata, out, flags) > 0)
			BIO_printf(bio_err, "Verification successful\n");
		else {
			BIO_printf(bio_err, "Verification failure\n");
			goto end;
		}
	} else if (operation == SMIME_ENCRYPTED_DECRYPT) {
		if (!CMS_EncryptedData_decrypt(cms, secret_key, secret_keylen,
		    indata, out, flags))
			goto end;
	} else if (operation == SMIME_VERIFY) {
		if (CMS_verify(cms, other, store, indata, out, flags) > 0)
			BIO_printf(bio_err, "Verification successful\n");
		else {
			BIO_printf(bio_err, "Verification failure\n");
			if (verify_retcode)
				ret = verify_err + 32;
			goto end;
		}
		if (signerfile) {
			STACK_OF(X509) *signers;
			if ((signers = CMS_get0_signers(cms)) == NULL)
				goto end;
			if (!save_certs(signerfile, signers)) {
				BIO_printf(bio_err,
				    "Error writing signers to %s\n",
				    signerfile);
				ret = 5;
				goto end;
			}
			sk_X509_free(signers);
		}
		if (rr_print)
			receipt_request_print(bio_err, cms);

	} else if (operation == SMIME_VERIFY_RECEIPT) {
		if (CMS_verify_receipt(rcms, cms, other, store, flags) > 0)
			BIO_printf(bio_err, "Verification successful\n");
		else {
			BIO_printf(bio_err, "Verification failure\n");
			goto end;
		}
	} else {
		if (noout) {
			if (print &&
			    !CMS_ContentInfo_print_ctx(out, cms, 0, NULL))
				goto end;
		} else if (outformat == FORMAT_SMIME) {
			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 (operation == SMIME_RESIGN)
				ret = SMIME_write_CMS(out, cms, indata, flags);
			else
				ret = SMIME_write_CMS(out, cms, in, flags);
		} else if (outformat == FORMAT_PEM)
			ret = PEM_write_bio_CMS_stream(out, cms, in, flags);
		else if (outformat == FORMAT_ASN1)
			ret = i2d_CMS_bio_stream(out, cms, in, flags);
		else {
			BIO_printf(bio_err, "Bad output format for CMS file\n");
			goto end;
		}
		if (ret <= 0) {
			ret = 6;
			goto end;
		}
	}
	ret = 0;

 end:
	if (ret)
		ERR_print_errors(bio_err);

	sk_X509_pop_free(encerts, X509_free);
	sk_X509_pop_free(other, X509_free);
	X509_VERIFY_PARAM_free(vpm);
	sk_OPENSSL_STRING_free(sksigners);
	sk_OPENSSL_STRING_free(skkeys);
	free(secret_key);
	free(secret_keyid);
	free(pwri_tmp);
	ASN1_OBJECT_free(econtent_type);
	CMS_ReceiptRequest_free(rr);
	sk_OPENSSL_STRING_free(rr_to);
	sk_OPENSSL_STRING_free(rr_from);
	for (key_param = key_first; key_param;) {
		struct cms_key_param *tparam;
		sk_OPENSSL_STRING_free(key_param->param);
		tparam = key_param->next;
		free(key_param);
		key_param = tparam;
	}
	X509_STORE_free(store);
	X509_free(cert);
	X509_free(recip);
	X509_free(signer);
	EVP_PKEY_free(key);
	CMS_ContentInfo_free(cms);
	CMS_ContentInfo_free(rcms);
	BIO_free(rctin);
	BIO_free(in);
	BIO_free(indata);
	BIO_free_all(out);
	free(passin);

	return (ret);
}

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;
}

/* Minimal callback just to output policy info (if any) */

static int
cms_cb(int ok, X509_STORE_CTX *ctx)
{
	int error;

	error = X509_STORE_CTX_get_error(ctx);

	verify_err = error;

	if ((error != X509_V_ERR_NO_EXPLICIT_POLICY) &&
	    ((error != X509_V_OK) || (ok != 2)))
		return ok;

	policies_print(NULL, ctx);

	return ok;
}

static void
gnames_stack_print(BIO *out, STACK_OF(GENERAL_NAMES) *gns)
{
	STACK_OF(GENERAL_NAME) *gens;
	GENERAL_NAME *gen;
	int i, j;

	for (i = 0; i < sk_GENERAL_NAMES_num(gns); i++) {
		gens = sk_GENERAL_NAMES_value(gns, i);
		for (j = 0; j < sk_GENERAL_NAME_num(gens); j++) {
			gen = sk_GENERAL_NAME_value(gens, j);
			BIO_puts(out, "    ");
			GENERAL_NAME_print(out, gen);
			BIO_puts(out, "\n");
		}
	}
	return;
}

static void
receipt_request_print(BIO *out, CMS_ContentInfo *cms)
{
	STACK_OF(CMS_SignerInfo) *sis;
	CMS_SignerInfo *si;
	CMS_ReceiptRequest *rr;
	int allorfirst;
	STACK_OF(GENERAL_NAMES) *rto, *rlist;
	ASN1_STRING *scid;
	int i, rv;

	if ((sis = CMS_get0_SignerInfos(cms)) == NULL)
		return;
	for (i = 0; i < sk_CMS_SignerInfo_num(sis); i++) {
		si = sk_CMS_SignerInfo_value(sis, i);
		rv = CMS_get1_ReceiptRequest(si, &rr);
		BIO_printf(bio_err, "Signer %d:\n", i + 1);
		if (rv == 0)
			BIO_puts(bio_err, "  No Receipt Request\n");
		else if (rv < 0) {
			BIO_puts(bio_err, "  Receipt Request Parse Error\n");
			ERR_print_errors(bio_err);
		} else {
			char *id;
			int idlen;
			CMS_ReceiptRequest_get0_values(rr, &scid, &allorfirst,
			    &rlist, &rto);
			BIO_puts(out, "  Signed Content ID:\n");
			idlen = ASN1_STRING_length(scid);
			id = (char *) ASN1_STRING_data(scid);
			BIO_dump_indent(out, id, idlen, 4);
			BIO_puts(out, "  Receipts From");
			if (rlist) {
				BIO_puts(out, " List:\n");
				gnames_stack_print(out, rlist);
			} else if (allorfirst == 1)
				BIO_puts(out, ": First Tier\n");
			else if (allorfirst == 0)
				BIO_puts(out, ": All\n");
			else
				BIO_printf(out, " Unknown (%d)\n", allorfirst);
			BIO_puts(out, "  Receipts To:\n");
			gnames_stack_print(out, rto);
		}
		if (rr)
			CMS_ReceiptRequest_free(rr);
	}
}

static STACK_OF(GENERAL_NAMES) *
make_names_stack(STACK_OF(OPENSSL_STRING) *ns)
{
	int i;
	STACK_OF(GENERAL_NAMES) *ret;
	GENERAL_NAMES *gens = NULL;
	GENERAL_NAME *gen = NULL;
	if ((ret = sk_GENERAL_NAMES_new_null()) == NULL)
		goto err;
	for (i = 0; i < sk_OPENSSL_STRING_num(ns); i++) {
		char *str = sk_OPENSSL_STRING_value(ns, i);
		gen = a2i_GENERAL_NAME(NULL, NULL, NULL, GEN_EMAIL, str, 0);
		if (!gen)
			goto err;
		gens = GENERAL_NAMES_new();
		if (!gens)
			goto err;
		if (!sk_GENERAL_NAME_push(gens, gen))
			goto err;
		gen = NULL;
		if (!sk_GENERAL_NAMES_push(ret, gens))
			goto err;
		gens = NULL;
	}

	return ret;

 err:
	sk_GENERAL_NAMES_pop_free(ret, GENERAL_NAMES_free);
	GENERAL_NAMES_free(gens);
	GENERAL_NAME_free(gen);

	return NULL;
}


static CMS_ReceiptRequest *
make_receipt_request(STACK_OF(OPENSSL_STRING) *rr_to, int rr_allorfirst,
    STACK_OF(OPENSSL_STRING) *rr_from)
{
	STACK_OF(GENERAL_NAMES) *rct_to, *rct_from;
	CMS_ReceiptRequest *rr;

	rct_to = make_names_stack(rr_to);
	if (!rct_to)
		goto err;
	if (rr_from) {
		rct_from = make_names_stack(rr_from);
		if (!rct_from)
			goto err;
	} else
		rct_from = NULL;

	if ((rr = CMS_ReceiptRequest_create0(NULL, -1, rr_allorfirst, rct_from,
	    rct_to)) == NULL)
		goto err;

	return rr;

 err:
	return NULL;
}

static int
cms_set_pkey_param(EVP_PKEY_CTX *pctx, STACK_OF(OPENSSL_STRING) *param)
{
	char *keyopt;
	int i;

	if (sk_OPENSSL_STRING_num(param) <= 0)
		return 1;
	for (i = 0; i < sk_OPENSSL_STRING_num(param); i++) {
		keyopt = sk_OPENSSL_STRING_value(param, i);
		if (pkey_ctrl_string(pctx, keyopt) <= 0) {
			BIO_printf(bio_err, "parameter error \"%s\"\n", keyopt);
			ERR_print_errors(bio_err);
			return 0;
		}
	}
	return 1;
}

#endif
