/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2002 Hiroyuki Yamamoto
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#if USE_OPENSSL

#include "defs.h"

#include <glib.h>

#include "intl.h"
#include "utils.h"
#include "ssl.h"
#include "log.h"
#include "ssl_certificate.h"

static SSL_CTX *ssl_ctx;

void ssl_init(void)
{
	SSL_METHOD *meth;
	FILE *cert_test;

	/* Global system initialization*/
	SSL_library_init();
	SSL_load_error_strings();
	
	/* Create our context*/
	meth = SSLv23_client_method();
	ssl_ctx = SSL_CTX_new(meth);

	/* Set default certificate paths */
	SSL_CTX_set_default_verify_paths(ssl_ctx);
	
	/* this problem seems quite common */
	cert_test = fopen (X509_get_default_cert_file(), "r");
	if (cert_test != NULL)
		fclose(cert_test);
	else {
		printf("ssl_init: warning, can't open %s\n", X509_get_default_cert_file());
		printf("ssl_init: it means that certificates' signatures won't appear as Correct,\n");
		printf("ssl_init: even if they should. Check your openssl install.\n");
	}
#if (OPENSSL_VERSION_NUMBER < 0x0090600fL)
	SSL_CTX_set_verify_depth(ctx,1);
#endif
}

void ssl_done(void)
{
	if (!ssl_ctx)
		return;
	
	SSL_CTX_free(ssl_ctx);
}

gboolean ssl_init_socket(SockInfo *sockinfo)
{
	return ssl_init_socket_with_method(sockinfo, SSL_METHOD_SSLv23);
}

gboolean ssl_init_socket_with_method(SockInfo *sockinfo, SSLMethod method)
{
	X509 *server_cert;
	SSL *ssl;

	ssl = SSL_new(ssl_ctx);
	if (ssl == NULL) {
		log_warning(_("Error creating ssl context\n"));
		return FALSE;
	}

	switch (method) {
	case SSL_METHOD_SSLv23:
		debug_print("Setting SSLv23 client method\n");
		SSL_set_ssl_method(ssl, SSLv23_client_method());
		break;
	case SSL_METHOD_TLSv1:
		debug_print("Setting TLSv1 client method\n");
		SSL_set_ssl_method(ssl, TLSv1_client_method());
		break;
	default:
		break;
	}

	SSL_set_fd(ssl, sockinfo->sock);
	if (SSL_connect(ssl) == -1) {
		log_warning(_("SSL connect failed (%s)\n"),
			    ERR_error_string(ERR_get_error(), NULL));
		SSL_free(ssl);
		return FALSE;
	}

	/* Get the cipher */
	log_print(_("SSL connection using %s\n"), SSL_get_cipher(ssl));

	/* Get server's certificate (note: beware of dynamic allocation) */
	if ((server_cert = SSL_get_peer_certificate(ssl)) == NULL) {
		debug_print("server_cert is NULL ! this _should_not_ happen !\n");
		SSL_free(ssl);
		return FALSE;
	}

/*
	if (!ssl_certificate_check(server_cert, sockinfo->hostname, sockinfo->port)) {
		X509_free(server_cert);
		SSL_free(ssl);
		return FALSE;
	}
*/

	X509_free(server_cert);
	sockinfo->ssl = ssl;

	return TRUE;
}

void ssl_done_socket(SockInfo *sockinfo)
{
	if (sockinfo->ssl) {
		SSL_free(sockinfo->ssl);
	}
}

#endif /* USE_OPENSSL */