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Initial support for pledges in openssl(1) commands.

openssl(1) has two mechanisms for operating: either a single execution
of one command (looking at argv[0] or argv[1]) or as an interactive
session than may execute any number of commands.

We already have a top level pledge that should cover all commands
and that's what interactive mode must continue using.  However, we can
tighten up the pledges when only executing one command.

This is an initial stab at support and may contain regressions.  Most
commands only need "stdio rpath wpath cpath".  The pledges could be
further restricted by evaluating the situation after parsing options.

deraadt@ and beck@ are roughly fine with this approach.

/* $OpenBSD: ciphers.c,v 1.7 2015/10/10 22:28:51 doug Exp $ */
/*
 * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>

#include <openssl/err.h>
#include <openssl/ssl.h>

#include "apps.h"
#include "progs.h"

struct {
	int usage;
	int verbose;
} ciphers_config;

struct option ciphers_options[] = {
	{
		.name = "h",
		.type = OPTION_FLAG,
		.opt.flag = &ciphers_config.usage,
	},
	{
		.name = "?",
		.type = OPTION_FLAG,
		.opt.flag = &ciphers_config.usage,
	},
	{
		.name = "tls1",
		.desc = "This option is deprecated since it is the default",
		.type = OPTION_DISCARD,
	},
	{
		.name = "v",
		.desc = "Provide cipher listing",
		.type = OPTION_VALUE,
		.opt.value = &ciphers_config.verbose,
		.value = 1,
	},
	{
		.name = "V",
		.desc = "Provide cipher listing with cipher suite values",
		.type = OPTION_VALUE,
		.opt.value = &ciphers_config.verbose,
		.value = 2,
	},
	{ NULL },
};

static void
ciphers_usage(void)
{
	fprintf(stderr, "usage: ciphers [-hVv] [-tls1] [cipherlist]\n");
	options_usage(ciphers_options);
}

int
ciphers_main(int argc, char **argv)
{
	char *cipherlist = NULL;
	STACK_OF(SSL_CIPHER) *ciphers;
	const SSL_CIPHER *cipher;
	SSL_CTX *ssl_ctx = NULL;
	SSL *ssl = NULL;
	uint16_t value;
	int i, rv = 0;
	char *desc;

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

	memset(&ciphers_config, 0, sizeof(ciphers_config));

	if (options_parse(argc, argv, ciphers_options, &cipherlist,
	    NULL) != 0) {
		ciphers_usage();
		return (1);
	}

	if (ciphers_config.usage) {
		ciphers_usage();
		return (1);
	}

	if ((ssl_ctx = SSL_CTX_new(TLSv1_client_method())) == NULL)
		goto err;

	if (cipherlist != NULL) {
		if (SSL_CTX_set_cipher_list(ssl_ctx, cipherlist) == 0)
			goto err;
	}

	if ((ssl = SSL_new(ssl_ctx)) == NULL)
		goto err;

	if ((ciphers = SSL_get_ciphers(ssl)) == NULL)
		goto err;

	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
		cipher = sk_SSL_CIPHER_value(ciphers, i);
		if (ciphers_config.verbose == 0) {
			fprintf(stdout, "%s%s", (i ? ":" : ""),
			    SSL_CIPHER_get_name(cipher));
			continue;
		}
		if (ciphers_config.verbose > 1) {
			value = SSL_CIPHER_get_value(cipher);
			fprintf(stdout, "%-*s0x%02X,0x%02X - ", 10, "",
				((value >> 8) & 0xff), (value & 0xff));
		}
		desc = SSL_CIPHER_description(cipher, NULL, 0);
		if (strcmp(desc, "OPENSSL_malloc Error") == 0) {
			fprintf(stderr, "out of memory\n");
			goto err;
		}
		fprintf(stdout, "%s", desc);
		free(desc);
	}
	if (ciphers_config.verbose == 0)
		fprintf(stdout, "\n");

	goto done;

err:
	ERR_print_errors_fp(stderr);
	rv = 1;

done:
	SSL_CTX_free(ssl_ctx);
	SSL_free(ssl);

	return (rv);
}