<?php

/* ========================================================================== */
/*
    sshdcond.inc
    part of pfSense (http://www.pfSense.com)
    Copyright (C) 2012 Marcello Coutinho
    Copyright (C) 2012 Han Van (namezero@afim.info)
    All rights reserved.

    Based on m0n0wall (http://m0n0.ch/wall)
    Copyright (C) 2003-2006 Manuel Kasper <mk@neon1.net>.
    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.

    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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
    AUTHOR 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.
                                                                              */
/* ========================================================================== */
 require_once("config.inc");
 require_once("util.inc");
 
function restart_sshd(){
	#backup /etc/sshd before any change
	$etc_sshd="/etc/sshd";
    $pfsense_version=preg_replace("/\s/","",file_get_contents("/etc/version"));
    if (!file_exists('/root/'.$pfsense_version.'.sshd.backup')){
    	copy ($etc_sshd,'/root/'.$pfsense_version.'.sshd.backup');
    	}
    	
	#patch /etc/sshd if need
	$sshd_file=file($etc_sshd);
	$sshd_new_file="";
	foreach ($sshd_file as $line){
		if (preg_match('/sshconf .= "Port/',$line)){
			$sshd_new_file.= $line;
			$sshd_new_file.= "\t".'if(file_exists("/etc/ssh/sshd_extra")){$sshconf.=file_get_contents("/etc/ssh/sshd_extra");}'."\n";
		}
		elseif(!preg_match('/sshd_extra/',$line)){
			$sshd_new_file.= $line;
		}
	}
	file_put_contents($etc_sshd,$sshd_new_file,LOCK_EX);
	mwexec_bg($etc_sshd);
	}

function sshdcond_custom_php_install_command(){
	global $g, $config;

	conf_mount_rw();

	// We need to generate an outfile for our extra commands
	// The patched g_szSSHDFileGenerate php file then reads and appends that config
	$fd = fopen("/etc/ssh/sshd_extra", 'w');
	fclose($fd);	

	conf_mount_ro();
	}

function sshdcond_custom_php_deinstall_command(){
	global $g, $config;

	conf_mount_rw();

	// 1. Delete our config file
	unlink_if_exists("/etc/ssh/sshd_extra");

	// 2. Re-run sshd config generation script
	restart_sshd();

	conf_mount_ro();
	}

function sshdcond_custom_php_write_config(){
	global $g, $config;
	
	# detect boot process
	if (is_array($_POST)){
		if (!preg_match("/\w+/",$_POST['__csrf_magic']))
			return;
		}
	
	$sshd_extra="";
	if (is_array($config['installedpackages']['sshdcond']['config'])){
		// Mount Read-only
		conf_mount_rw();

		// Read config
		foreach ($config['installedpackages']['sshdcond']['config'] as $sshdcond){
			if ($sshdcond['enable'] && is_array($sshdcond['row'])){
				$sshd_extra.= "Match {$sshdcond['matchtype']} {$sshdcond['matchvalue']}\n";
				foreach ($sshdcond['row'] as $sshd){
					//check if there is spaces on sshd value
					if(preg_match ("/\s+/",$sshd['sshdvalue']))
						$sshd['sshdvalue']='"'.$sshd['sshdvalue'].'"';

					//check if value is not empty
					if($sshd['sshdvalue']!="")
						$sshd_extra.="\t {$sshd['sshdoption']} {$sshd['sshdvalue']}\n";

					//apply file permission if option is ChrootDirectory
					if ($sshd['sshdoption']=="ChrootDirectory" && file_exists($sshd['sshdvalue'])){
						chown('root',$sshd['sshdvalue']);
						chgrp('operator',$sshd['sshdvalue']);
					}
				}
			}
		}
	}

	//Save /etc/ssh/sshd_extra
	file_put_contents("/etc/ssh/sshd_extra",$sshd_extra,LOCK_EX);
	
	

	// Restart sshd
	restart_sshd();

	// Mount Read-only
	conf_mount_ro();
	
	//sync config with other pfsense servers
	sshdcond_sync_on_changes();
	}

/* Uses XMLRPC to synchronize the changes to a remote node */
function sshdcond_sync_on_changes() {
	global $config, $g;
	
	if (is_array($config['installedpackages']['sshdcondsync']))
		if (!$config['installedpackages']['sshdcondsync']['config'][0]['synconchanges'])	
			return;

	log_error("[sshdcond] xmlrpc sync is starting.");
	foreach ($config['installedpackages']['sshdcondsync']['config'] as $rs ){
		foreach($rs['row'] as $sh){
			$sync_to_ip = $sh['ipaddress'];
			$password = $sh['password'];
			if($password && $sync_to_ip)
				sshdcond_do_xmlrpc_sync($sync_to_ip, $password);
			}
	}
	log_error("[sshdcond] xmlrpc sync is ending.");
}

/* Do the actual XMLRPC sync */
function sshdcond_do_xmlrpc_sync($sync_to_ip, $password) {
	global $config, $g;

	if(!$password)
		return;

	if(!$sync_to_ip)
		return;

	$username='admin';
	$xmlrpc_sync_neighbor = $sync_to_ip;
    if($config['system']['webgui']['protocol'] != "") {
		$synchronizetoip = $config['system']['webgui']['protocol'];
		$synchronizetoip .= "://";
    }
    $port = $config['system']['webgui']['port'];
    /* if port is empty lets rely on the protocol selection */
    if($port == "") {
		if($config['system']['webgui']['protocol'] == "http") 
			$port = "80";
		else 
			$port = "443";
    }
	$synchronizetoip .= $sync_to_ip;

	/* xml will hold the sections to sync */
	$xml = array();
	$xml['sshdcond'] = $config['installedpackages']['sshdcond'];
	/* assemble xmlrpc payload */
	$params = array(
		XML_RPC_encode($password),
		XML_RPC_encode($xml)
	);

	/* set a few variables needed for sync code borrowed from filter.inc */
	$url = $synchronizetoip;
	log_error("Beginning sshdcond XMLRPC sync to {$url}:{$port}.");
	$method = 'pfsense.merge_installedpackages_section_xmlrpc';
	$msg = new XML_RPC_Message($method, $params);
	$cli = new XML_RPC_Client('/xmlrpc.php', $url, $port);
	$cli->setCredentials($username, $password);
	if($g['debug'])
		$cli->setDebug(1);
	/* send our XMLRPC message and timeout after 250 seconds */
	$resp = $cli->send($msg, "250");
	if(!$resp) {
		$error = "A communications error occurred while attempting sshdcond XMLRPC sync with {$url}:{$port}.";
		log_error($error);
		file_notice("sync_settings", $error, "sshdcond Settings Sync", "");
	} elseif($resp->faultCode()) {
		$cli->setDebug(1);
		$resp = $cli->send($msg, "250");
		$error = "An error code was received while attempting sshdcond XMLRPC sync with {$url}:{$port} - Code " . $resp->faultCode() . ": " . $resp->faultString();
		log_error($error);
		file_notice("sync_settings", $error, "sshdcond Settings Sync", "");
	} else {
		log_error("sshdcond XMLRPC sync successfully completed with {$url}:{$port}.");
	}
	
	/* tell sshdcond to reload our settings on the destionation sync host. */
	$method = 'pfsense.exec_php';
	$execcmd  = "require_once('/usr/local/pkg/sshdcond.inc');\n";
	$execcmd .= "sshdcond_custom_php_write_config();";
	/* assemble xmlrpc payload */
	$params = array(
		XML_RPC_encode($password),
		XML_RPC_encode($execcmd)
	);
	
	log_error("sshdcond XMLRPC reload data {$url}:{$port}.");
	$msg = new XML_RPC_Message($method, $params);
	$cli = new XML_RPC_Client('/xmlrpc.php', $url, $port);
	$cli->setCredentials($username, $password);
	$resp = $cli->send($msg, "250");
	if(!$resp) {
		$error = "A communications error occurred while attempting sshdcond XMLRPC sync with {$url}:{$port} (pfsense.exec_php).";
		log_error($error);
		file_notice("sync_settings", $error, "sshdcond Settings Sync", "");
	} elseif($resp->faultCode()) {
		$cli->setDebug(1);
		$resp = $cli->send($msg, "250");
		$error = "An error code was received while attempting sshdcond XMLRPC sync with {$url}:{$port} - Code " . $resp->faultCode() . ": " . $resp->faultString();
		log_error($error);
		file_notice("sync_settings", $error, "sshdcond Settings Sync", "");
	} else {
		log_error("sshdcond XMLRPC reload data success with {$url}:{$port} (pfsense.exec_php).");
	}
}
	?>