<?php
/*
 * xmlrpc.php
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2004-2016 Rubicon Communications, LLC (Netgate)
 * Copyright (c) 2005 Colin Smith
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

##|+PRIV
##|*IDENT=page-xmlrpclibrary
##|*NAME=XMLRPC Library
##|*DESCR=Allow access to the 'XMLRPC Library' page.
##|*MATCH=xmlrpc.php*
##|-PRIV

require_once("config.inc");
require_once("functions.inc");
require_once("auth.inc");
require_once("filter.inc");
require_once("ipsec.inc");
require_once("vpn.inc");
require_once("shaper.inc");
require_once("XML/RPC2/Server.php");

class pfsense_xmlrpc_server {

	private $loop_detected = false;
	private $remote_addr;

	private function auth() {
		global $config;
		$username = $_SERVER['PHP_AUTH_USER'];
		$password = $_SERVER['PHP_AUTH_PW'];

		$login_ok = false;
		if (!empty($username) && !empty($password)) {
			$attributes = array();
			$authcfg = auth_get_authserver(
			    $config['system']['webgui']['authmode']);

			if (authenticate_user($username, $password,
			    $authcfg, $attributes) ||
			    authenticate_user($username, $password)) {
				$login_ok = true;
			}
		}

		if (!$login_ok) {
			log_auth("webConfigurator authentication error for '" .
			    $username . "' from " . $this->remote_addr);

			require_once("XML/RPC2/Exception.php");
			throw new XML_RPC2_FaultException(gettext(
			    'Authentication failed: Invalid username or password'),
			    -1);
		}

		$user_entry = getUserEntry($username);
		/*
		 * admin (uid = 0) is allowed
		 * or regular user with necessary privilege
		 */
		if (isset($user_entry['uid']) && $user_entry['uid'] != '0' &&
		    !userHasPrivilege($user_entry, 'system-xmlrpc-ha-sync')) {
			log_auth("webConfigurator authentication error for '" .
			    $username . "' from " . $this->remote_addr .
			    " not enough privileges");

			require_once("XML/RPC2/Exception.php");
			throw new XML_RPC2_FaultException(gettext(
			    'Authentication failed: not enough privileges'),
			    -2);
		}

		return;
	}

	private function array_overlay($a1, $a2) {
		foreach ($a1 as $k => $v) {
			if (!array_key_exists($k, $a2)) {
				continue;
			}
			if (is_array($v) && is_array($a2[$k])) {
				$a1[$k] = $this->array_overlay($v, $a2[$k]);
			} else {
				$a1[$k] = $a2[$k];
			}
		}

		return $a1;
	}

	public function __construct() {
		global $config;

		$this->remote_addr = $_SERVER['REMOTE_ADDR'];

		/* grab sync to ip if enabled */
		if (isset($config['hasync']['synchronizetoip']) &&
		    $config['hasync']['synchronizetoip'] == $this->remote_addr) {
			$this->loop_detected = true;
		}
	}

	/**
	 * Get host version information
	 *
	 * @return array
	 */
	public function host_firmware_version($dummy = 1) {
		$this->auth();
		return host_firmware_version();
	}

	/**
	 * Executes a PHP block of code
	 *
	 * @param string $code
	 *
	 * @return bool
	 */
	public function exec_php($code) {
		$this->auth();

		eval($code);
		if ($toreturn) {
			return $toreturn;
		}

		return true;
	}

	/**
	 * Executes shell commands
	 *
	 * @param string $code
	 *
	 * @return bool
	 */
	public function exec_shell($code) {
		$this->auth();

		mwexec($code);
		return true;
	}

	/**
	 * Backup chosen config sections
	 *
	 * @param array $section
	 *
	 * @return array
	 */
	public function backup_config_section($section) {
		$this->auth();

		global $config;

		return array_intersect_key($config, array_flip($section));
	}

	/**
	 * Restore defined config section into local config
	 *
	 * @param array $sections
	 *
	 * @return bool
	 */
	public function restore_config_section($sections) {
		$this->auth();

		global $config;

		$old_config = $config;
		$old_ipsec_enabled = ipsec_enabled();

		if ($this->loop_detected) {
			log_error("Disallowing CARP sync loop");
			return true;
		}

		/*
		 * Some sections should just be copied and not merged or we end
		 * up unable to sync the deletion of the last item in a section
		 */
		$sync_full_sections = array(
			'aliases',
			'ca',
			'cert',
			'crl',
			'dhcpd',
			'dhcpv6',
			'dnsmasq',
			'filter',
			'ipsec',
			'load_balancer',
			'nat',
			'openvpn',
			'schedules',
			'unbound',
			'wol',
		);

		$syncd_full_sections = array();

		foreach ($sync_full_sections as $section) {
			if (!isset($sections[$section])) {
				continue;
			}

			$config[$section] = $sections[$section];
			unset($sections[$section]);
			$syncd_full_sections[] = $section;
		}

		$vipbackup = array();
		$oldvips = array();
		if (isset($sections['virtualip']) &&
		    is_array($config['virtualip']['vip'])) {
			foreach ($config['virtualip']['vip'] as $vip) {
				if ($vip['mode'] == "carp") {
					$key = $vip['interface'] .
					    "_vip" . $vip['vhid'];

					$oldvips[$key]['content'] =
					    $vip['password'] .
					    $vip['advskew'] .
					    $vip['subnet'] .
					    $vip['subnet_bits'] .
					    $vip['advbase'];
					$oldvips[$key]['interface'] =
					    $vip['interface'];
					$oldvips[$key]['subnet'] =
					    $vip['subnet'];
				} else if ($vip['mode'] == "ipalias" &&
				    (substr($vip['interface'], 0, 4) == '_vip'
				    || strstr($vip['interface'], "lo0"))) {
					$oldvips[$vip['subnet']]['content'] =
					    $vip['interface'] .
					    $vip['subnet'] .
					    $vip['subnet_bits'];
					$oldvips[$vip['subnet']]['interface'] =
					    $vip['interface'];
					$oldvips[$vip['subnet']]['subnet'] =
					    $vip['subnet'];
				} else if (($vip['mode'] == "ipalias" ||
				    $vip['mode'] == 'proxyarp') &&
				    !(substr($vip['interface'], 0, 4) == '_vip')
				    || strstr($vip['interface'], "lo0")) {
					$vipbackup[] = $vip;
				}
			}
		}

		/* For vip section, first keep items sent from the master */
		$config = array_merge_recursive_unique($config, $sections);

		/*
		 * Then add ipalias and proxyarp types already defined
		 * on the backup
		 */
		if (is_array($vipbackup) && !empty($vipbackup)) {
			if (!is_array($config['virtualip'])) {
				$config['virtualip'] = array();
			}
			if (!is_array($config['virtualip']['vip'])) {
				$config['virtualip']['vip'] = array();
			}
			foreach ($vipbackup as $vip) {
				array_unshift($config['virtualip']['vip'], $vip);
			}
		}

		/* Log what happened */
		$mergedkeys = implode(",", array_merge(array_keys($sections),
		    $syncd_full_sections));
		write_config(sprintf(gettext(
		    "Merged in config (%s sections) from XMLRPC client."),
		    $mergedkeys));

		/*
		 * The real work on handling the vips specially
		 * This is a copy of intefaces_vips_configure with addition of
		 * not reloading existing/not changed carps
		 */
		if (isset($sections['virtualip']) &&
		    is_array($config['virtualip']) &&
		    is_array($config['virtualip']['vip'])) {
			$carp_setuped = false;
			$anyproxyarp = false;

			foreach ($config['virtualip']['vip'] as $vip) {
				$key = "{$vip['interface']}_vip{$vip['vhid']}";

				if ($vip['mode'] == "carp" &&
				    isset($oldvips[$key])) {
					if ($oldvips[$key]['content'] ==
					    $vip['password'] .
					    $vip['advskew'] .
					    $vip['subnet'] .
					    $vip['subnet_bits'] .
					    $vip['advbase'] &&
					    does_vip_exist($vip)) {
						unset($oldvips[$key]);
						/*
						 * Skip reconfiguring this vips
						 * since nothing has changed.
						 */
						continue;
					}

				} elseif ($vip['mode'] == "ipalias" &&
				    (substr($vip['interface'], 0, 4) == '_vip'
				    || strstr($vip['interface'], "lo0")) &&
				    isset($oldvips[$vip['subnet']])) {
					$key = $vip['subnet'];
					if ($oldvips[$key]['content'] ==
					    $vip['interface'] .
					    $vip['subnet'] .
					    $vip['subnet_bits'] &&
					    does_vip_exist($vip)) {
						unset($oldvips[$key]);
						/*
						 * Skip reconfiguring this vips
						 * since nothing has changed.
						 */
						continue;
					}
					unset($oldvips[$key]);
				}

				switch ($vip['mode']) {
				case "proxyarp":
					$anyproxyarp = true;
					break;
				case "ipalias":
					interface_ipalias_configure($vip);
					break;
				case "carp":
					$carp_setuped = true;
					interface_carp_configure($vip);
					break;
				}
			}

			/* Cleanup remaining old carps */
			foreach ($oldvips as $oldvipar) {
				$oldvipif = get_real_interface(
				    $oldvipar['interface']);

				if (empty($oldvipif)) {
					continue;
				}

				if (is_ipaddrv6($oldvipar['subnet'])) {
					 mwexec("/sbin/ifconfig " .
					     escapeshellarg($oldvipif) .
					     " inet6 " .
					     escapeshellarg($oldvipar['subnet']) .
					     " delete");
				} else {
					pfSense_interface_deladdress($oldvipif,
					    $oldvipar['subnet']);
				}
			}
			if ($carp_setuped == true) {
				interfaces_sync_setup();
			}
			if ($anyproxyarp == true) {
				interface_proxyarp_configure();
			}
		}

		if ($old_ipsec_enabled !== ipsec_enabled()) {
			vpn_ipsec_configure();
		}

		unset($old_config);

		return true;
	}

	/**
	 * Merge items into installedpackages config section
	 *
	 * @param array $section
	 *
	 * @return bool
	 */
	public function merge_installedpackages_section($section) {
		$this->auth();

		global $config;

		if ($this->loop_detected) {
			log_error("Disallowing CARP sync loop");
			return true;
		}

		$config['installedpackages'] = array_merge(
		    $config['installedpackages'], $section);
		$mergedkeys = implode(",", array_keys($section));
		write_config(sprintf(gettext(
		    "Merged in config (%s sections) from XMLRPC client."),
		    $mergedkeys));

		return true;
	}

	/**
	 * Merge items into config
	 *
	 * @param array $section
	 *
	 * @return bool
	 */
	public function merge_config_section($section) {
		$this->auth();

		global $config;

		if ($this->loop_detected) {
			log_error("Disallowing CARP sync loop");
			return true;
		}

		$config_new = $this->array_overlay($config, $section);
		$config = $config_new;
		$mergedkeys = implode(",", array_keys($section));
		write_config(sprintf(gettext(
		    "Merged in config (%s sections) from XMLRPC client."),
		    $mergedkeys));

		return true;
	}

	/**
	 * Wrapper for filter_configure()
	 *
	 * @return bool
	 */
	public function filter_configure() {
		$this->auth();

		global $g, $config;

		filter_configure();
		system_routing_configure();
		setup_gateways_monitor();
		relayd_configure();
		require_once("openvpn.inc");
		openvpn_resync_all();

		/*
		 * The DNS Resolver and the DNS Forwarder may both be active so
		 * long as * they are running on different ports.
		 * See ticket #5882
		 */
		if (isset($config['dnsmasq']['enable'])) {
			/* Configure dnsmasq but tell it NOT to restart DHCP */
			services_dnsmasq_configure(false);
		} else {
			/* kill any running dnsmasq instance */
			if (isvalidpid("{$g['varrun_path']}/dnsmasq.pid")) {
				sigkillbypid("{$g['varrun_path']}/dnsmasq.pid",
				    "TERM");
			}
		}
		if (isset($config['unbound']['enable'])) {
			/* Configure unbound but tell it NOT to restart DHCP */
			services_unbound_configure(false);
		} else {
			/* kill any running Unbound instance */
			if (isvalidpid("{$g['varrun_path']}/unbound.pid")) {
				sigkillbypid("{$g['varrun_path']}/unbound.pid",
				    "TERM");
			}
		}

		/*
		 * Call this separately since the above are manually set to
		 * skip the DHCP restart they normally perform.
		 * This avoids restarting dhcpd twice as described on
		 * ticket #3797
		 */
		services_dhcpd_configure();

		local_sync_accounts();

		return true;
	}

	/**
	 * Wrapper for configuring CARP interfaces
	 *
	 * @return bool
	 */
	public function interfaces_carp_configure() {
		$this->auth();

		if ($this->loop_detected) {
			log_error("Disallowing CARP sync loop");
			return true;
		}

		interfaces_vips_configure();

		return true;
	}

	/**
	 * Wrapper for rc.reboot
	 *
	 * @return bool
	 */
	public function reboot() {
		$this->auth();

		mwexec_bg("/etc/rc.reboot");

		return true;
	}
}

$xmlrpclockkey = lock('xmlrpc', LOCK_EX);

XML_RPC2_Backend::setBackend('php');
$HTTP_RAW_POST_DATA = file_get_contents('php://input');

$options = array(
	'prefix' => 'pfsense.',
	'encoding' => 'utf-8',
	'autoDocument' => false,
);

$server = XML_RPC2_Server::create(new pfsense_xmlrpc_server(), $options);
$server->handleCall();

unlock($xmlrpclockkey);

?>