/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2005 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_SSL

#include "defs.h"

#include <glib.h>
#include <glib/gi18n.h>

#include "utils.h"
#include "ssl.h"

static SSL_CTX *ssl_ctx_SSLv23;
static SSL_CTX *ssl_ctx_TLSv1;

void ssl_init(void)
{
	gchar *certs_dir;

	SSL_library_init();
	SSL_load_error_strings();

	certs_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, "certs", NULL);
	if (!is_dir_exist(certs_dir)) {
		debug_print("%s doesn't exist, or not a directory.\n",
			    certs_dir);
		g_free(certs_dir);
		certs_dir = NULL;
	}

	ssl_ctx_SSLv23 = SSL_CTX_new(SSLv23_client_method());
	if (ssl_ctx_SSLv23 == NULL) {
		debug_print(_("SSLv23 not available\n"));
	} else {
		debug_print(_("SSLv23 available\n"));
		if (certs_dir &&
		    !SSL_CTX_load_verify_locations(ssl_ctx_SSLv23, NULL,
						   certs_dir))
			g_warning("SSLv23 SSL_CTX_load_verify_locations failed.\n");
	}

	ssl_ctx_TLSv1 = SSL_CTX_new(TLSv1_client_method());
	if (ssl_ctx_TLSv1 == NULL) {
		debug_print(_("TLSv1 not available\n"));
	} else {
		debug_print(_("TLSv1 available\n"));
		if (certs_dir &&
		    !SSL_CTX_load_verify_locations(ssl_ctx_TLSv1, NULL,
						   certs_dir))
			g_warning("TLSv1 SSL_CTX_load_verify_locations failed.\n");
	}

	g_free(certs_dir);
}

void ssl_done(void)
{
	if (ssl_ctx_SSLv23) {
		SSL_CTX_free(ssl_ctx_SSLv23);
	}

	if (ssl_ctx_TLSv1) {
		SSL_CTX_free(ssl_ctx_TLSv1);
	}
}

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;
	gint ret;

	switch (method) {
	case SSL_METHOD_SSLv23:
		if (!ssl_ctx_SSLv23) {
			g_warning(_("SSL method not available\n"));
			return FALSE;
		}
		sockinfo->ssl = SSL_new(ssl_ctx_SSLv23);
		break;
	case SSL_METHOD_TLSv1:
		if (!ssl_ctx_TLSv1) {
			g_warning(_("SSL method not available\n"));
			return FALSE;
		}
		sockinfo->ssl = SSL_new(ssl_ctx_TLSv1);
		break;
	default:
		g_warning(_("Unknown SSL method *PROGRAM BUG*\n"));
		return FALSE;
		break;
	}

	if (sockinfo->ssl == NULL) {
		g_warning(_("Error creating ssl context\n"));
		return FALSE;
	}

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

	/* Get the cipher */

	debug_print(_("SSL connection using %s\n"),
		    SSL_get_cipher(sockinfo->ssl));

	/* Get server's certificate (note: beware of dynamic allocation) */

	if ((server_cert = SSL_get_peer_certificate(sockinfo->ssl)) != NULL) {
		gchar *str;
		glong verify_result;

		debug_print(_("Server certificate:\n"));

		if ((str = X509_NAME_oneline(X509_get_subject_name(server_cert), 0, 0)) != NULL) {
			debug_print(_("  Subject: %s\n"), str);
			g_free(str);
		}

		if ((str = X509_NAME_oneline(X509_get_issuer_name(server_cert), 0, 0)) != NULL) {
			debug_print(_("  Issuer: %s\n"), str);
			g_free(str);
		}

		verify_result = SSL_get_verify_result(sockinfo->ssl);
		if (verify_result == X509_V_OK)
			debug_print("SSL verify OK\n");
		else
			g_warning("%s: SSL certificate verify failed (%ld: %s)\n",
				  sockinfo->hostname, verify_result,
				  X509_verify_cert_error_string(verify_result));

		X509_free(server_cert);
	}

	return TRUE;
}

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

#endif /* USE_SSL */