<?php
/* $Id$ */
/*
	filter_log.inc
	part of pfSesne by Scott Ullrich
	originally based on m0n0wall (http://m0n0.ch/wall)

	Copyright (C) 2009 Jim Pingle <myfirstname>@<mylastname>.org
	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.
*/
/*
	pfSense_BUILDER_BINARIES:	/usr/sbin/fifolog_reader	/usr/bin/tail	/usr/local/sbin/clog
	pfSense_MODULE:	filter
*/

require 'config.inc';

global $buffer_rules_rdr, $buffer_rules_normal;
$buffer_rules_rdr = array();
$buffer_rules_normal = array();

/* format filter logs */
function conv_log_filter($logfile, $nentries, $tail = 50, $filtertext = "", $filterinterface = null) {
	global $config, $g;

	/* Make sure this is a number before using it in a system call */
	if (!(is_numeric($tail)))
		return;

	if ($filtertext)
		$tail = 5000;

	/* Always do a reverse tail, to be sure we're grabbing the 'end' of the log. */
	$logarr = "";

	if(isset($config['system']['usefifolog']))
		exec("/usr/sbin/fifolog_reader " . escapeshellarg($logfile) . " | /usr/bin/grep 'filterlog:' | /usr/bin/tail -r -n {$tail}", $logarr);
	else
		exec("/usr/local/sbin/clog " . escapeshellarg($logfile) . " | grep -v \"CLOG\" | grep -v \"\033\" | /usr/bin/grep 'filterlog:' | /usr/bin/tail -r -n {$tail}", $logarr);

	$filterlog = array();
	$counter = 0;

	$filterinterface = strtoupper($filterinterface);
	foreach ($logarr as $logent) {
		if($counter >= $nentries)
			break;

		$flent = parse_filter_line($logent);
		if (!$filterinterface || ($filterinterface == $flent['interface']))
		{
			if ( ( ($flent != "") && (!is_array($filtertext)) && (match_filter_line ($flent, $filtertext))) || 
			     ( ($flent != "") && ( is_array($filtertext)) && (match_filter_field($flent, $filtertext)) ) ) {
				$counter++;
				$filterlog[] = $flent;
			}
		}
	}
	/* Since the lines are in reverse order, flip them around if needed based on the user's preference */
	return isset($config['syslog']['reverse']) ? $filterlog : array_reverse($filterlog);
}

function escape_filter_regex($filtertext) {
	/* If the caller (user) has not already put a backslash before a slash, to escape it in the regex, */
	/* then this will do it. Take out any "\/" already there, then turn all ordinary "/" into "\/".  */
	return str_replace('/', '\/', str_replace('\/', '/', $filtertext));
}

function match_filter_line($flent, $filtertext = "") {
	if (!$filtertext)
		return true;
	$filtertext = escape_filter_regex(str_replace(' ', '\s+', $filtertext));
	return @preg_match("/{$filtertext}/i", implode(" ", array_values($flent)));
}

function match_filter_field($flent, $fields) {
	foreach ($fields as $key => $field) {
		if ($field == "All")
			continue;
		if ((strpos($field, '!') === 0)) {
			$field = substr($field, 1);
			if (strtolower($key) == 'act') {
				if (in_arrayi($flent[$key], explode(" ", $field)))
					return false;
			} else {
				$field_regex = escape_filter_regex($field);
				if (@preg_match("/{$field_regex}/i", $flent[$key]))
					return false;
			}
		} else {
			if (strtolower($key) == 'act') {
				if (!in_arrayi($flent[$key], explode(" ", $field)))
					return false;
			} else {
				$field_regex = escape_filter_regex($field);
				if (!@preg_match("/{$field_regex}/i", $flent[$key]))
					return false;
			}
		}
	}
	return true;
}

// Case Insensitive in_array function
function in_arrayi($needle, $haystack) {
	return in_array(strtolower($needle), array_map('strtolower', $haystack));
}

function parse_filter_line($line) {
	global $config, $g;

	$flent = array();
	$log_split = "";

	if (!preg_match("/(.*)\s(.*)\sfilterlog:\s(.*)$/", $line, $log_split))
		return "";

	list($all, $flent['time'], $host, $rule) = $log_split;

	$rule_data = explode(",", $rule);
	$field = 0;

	$flent['rulenum'] = $rule_data[$field++];
	$flent['subrulenum'] = $rule_data[$field++];
	$flent['anchor'] = $rule_data[$field++];
	$flent['tracker'] = $rule_data[$field++];
	$flent['realint'] = $rule_data[$field++];
	$flent['interface']  = convert_real_interface_to_friendly_descr($flent['realint']);
	$flent['reason'] = $rule_data[$field++];
	$flent['act'] = $rule_data[$field++];
	$flent['direction'] = $rule_data[$field++];
	$flent['version'] = $rule_data[$field++];

	if ($flent['version'] == '4' || $flent['version'] == '6') {
		if ($flent['version'] == '4') {
			$flent['tos'] = $rule_data[$field++];
			$flent['ecn'] = $rule_data[$field++];
			$flent['ttl'] = $rule_data[$field++];
			$flent['id'] = $rule_data[$field++];
			$flent['offset'] = $rule_data[$field++];
			$flent['flags'] = $rule_data[$field++];
			$flent['protoid'] = $rule_data[$field++];
			$flent['proto'] = strtoupper($rule_data[$field++]);
		} else {
			$flent['class'] = $rule_data[$field++];
			$flent['flowlabel'] = $rule_data[$field++];
			$flent['hlim'] = $rule_data[$field++];
			$flent['proto'] = $rule_data[$field++];
			$flent['protoid'] = $rule_data[$field++];
		}

		$flent['length'] = $rule_data[$field++];
		$flent['srcip'] = $rule_data[$field++];
		$flent['dstip'] = $rule_data[$field++];

		if ($flent['protoid'] == '6' || $flent['protoid'] == '17') { // TCP or UDP
			$flent['srcport'] = $rule_data[$field++];
			$flent['dstport'] = $rule_data[$field++];

			$flent['src'] = $flent['srcip'] . ':' . $flent['srcport'];
			$flent['dst'] = $flent['dstip'] . ':' . $flent['dstport'];

			$flent['datalen'] = $rule_data[$field++];
			if ($flent['protoid'] == '6') { // TCP
				$flent['tcpflags'] = $rule_data[$field++];
				$flent['seq'] = $rule_data[$field++];
				$flent['ack'] = $rule_data[$field++];
				$flent['window'] = $rule_data[$field++];
				$flent['urg'] = $rule_data[$field++];
				$flent['options'] = explode(";",$rule_data[$field++]);
			}
		} else if ($flent['protoid'] == '1') { // ICMP
			$flent['src'] = $flent['srcip'];
			$flent['dst'] = $flent['dstip'];

			$flent['icmp_type'] = $rule_data[$field++];

			switch ($flent['icmp_type']) {
			case "request":
			case "reply":
				$flent['icmp_id'] = $rule_data[$field++];
				$flent['icmp_seq'] = $rule_data[$field++];
				break;
			case "unreachproto":
				$flent['icmp_dstip'] = $rule_data[$field++];
				$flent['icmp_protoid'] = $rule_data[$field++];
				break;
			case "unreachport":
				$flent['icmp_dstip'] = $rule_data[$field++];
				$flent['icmp_protoid'] = $rule_data[$field++];
				$flent['icmp_port'] = $rule_data[$field++];
				break;
			case "unreach":
			case "timexceed":
			case "paramprob":
			case "redirect":
			case "maskreply":
				$flent['icmp_descr'] = $rule_data[$field++];
				break;
			case "needfrag":
				$flent['icmp_dstip'] = $rule_data[$field++];
				$flent['icmp_mtu'] = $rule_data[$field++];
				break;
			case "tstamp":
				$flent['icmp_id'] = $rule_data[$field++];
				$flent['icmp_seq'] = $rule_data[$field++];
				break;
			case "tstampreply":
				$flent['icmp_id'] = $rule_data[$field++];
				$flent['icmp_seq'] = $rule_data[$field++];
				$flent['icmp_otime'] = $rule_data[$field++];
				$flent['icmp_rtime'] = $rule_data[$field++];
				$flent['icmp_ttime'] = $rule_data[$field++];
				break;
			default :
				$flent['icmp_descr'] = $rule_data[$field++];
				break;
			}

		} else if ($flent['protoid'] == '112') { // CARP
			$flent['type'] = $rule_data[$field++];
			$flent['ttl'] = $rule_data[$field++];
			$flent['vhid'] = $rule_data[$field++];
			$flent['version'] = $rule_data[$field++];
			$flent['advskew'] = $rule_data[$field++];
			$flent['advbase'] = $rule_data[$field++];
		}
	} else {
		if($g['debug'])
			log_error(sprintf(gettext("There was a error parsing rule number: %s.   Please report to mailing list or forum."), $flent['rulenum']));
		return "";
	}

	/* If there is a src, a dst, and a time, then the line should be usable/good */
	if (!((trim($flent['src']) == "") || (trim($flent['dst']) == "") || (trim($flent['time']) == ""))) {
		return $flent;
	} else {
		if($g['debug']) {
			log_error(sprintf(gettext("There was a error parsing rule: %s.   Please report to mailing list or forum."), $errline));
		}
		return "";
	}
}

function get_port_with_service($port, $proto) {
	if (!$port)
		return '';

	$service = getservbyport($port, $proto);
	$portstr = "";
	if ($service) {
		$portstr = sprintf('<span title="' . gettext('Service %1$s/%2$s: %3$s') . '">' . htmlspecialchars($port) . '</span>', $port, $proto, $service);
	} else {
		$portstr = htmlspecialchars($port);
	}
	return ':' . $portstr;
}

function find_rule_by_number($rulenum, $trackernum, $type="block") {
	global $g;

	/* Passing arbitrary input to grep could be a Very Bad Thing(tm) */
	if (!is_numeric($rulenum) || !is_numeric($trackernum) || !in_array($type, array('pass', 'block', 'match', 'rdr')))
		return;

	if ($trackernum == "0")
		$lookup_pattern = "^@{$rulenum}\([0-9]+\)[[:space:]]{$type}[[:space:]].*[[:space:]]log[[:space:]]";
	else
		$lookup_pattern = "^@[0-9]+\({$trackernum}\)[[:space:]]{$type}[[:space:]].*[[:space:]]log[[:space:]]";

	/* At the moment, miniupnpd is the only thing I know of that
	   generates logging rdr rules */
	unset($buffer);
	if ($type == "rdr")
		$_gb = exec("/sbin/pfctl -vvPsn -a \"miniupnpd\" | /usr/bin/egrep " . escapeshellarg("^@{$rulenum}"), $buffer);
	else {
		if (file_exists("{$g['tmp_path']}/rules.debug"))
			$_gb = exec("/sbin/pfctl -vvPnf {$g['tmp_path']}/rules.debug 2>/dev/null | /usr/bin/egrep " . escapeshellarg($lookup_pattern), $buffer);
		else
			$_gb = exec("/sbin/pfctl -vvPsr | /usr/bin/egrep " . escapeshellarg($lookup_pattern), $buffer);
	}
	if (is_array($buffer))
		return $buffer[0];

	return "";
}

function buffer_rules_load() {
	global $g, $buffer_rules_rdr, $buffer_rules_normal;
	unset($buffer, $buffer_rules_rdr, $buffer_rules_normal);
	/* Redeclare globals after unset to work around PHP */
	global $buffer_rules_rdr, $buffer_rules_normal;
	$buffer_rules_rdr = array();
	$buffer_rules_normal = array();

	$_gb = exec("/sbin/pfctl -vvPsn -a \"miniupnpd\" | grep '^@'", $buffer);
	if (is_array($buffer)) {
		foreach ($buffer as $line) {
			list($key, $value) = explode (" ", $line, 2);
			$buffer_rules_rdr[$key] = $value;
		}
	}
	unset($buffer, $_gb);
	if (file_exists("{$g['tmp_path']}/rules.debug"))
		$_gb = exec("/sbin/pfctl -vvPnf {$g['tmp_path']}/rules.debug 2>/dev/null | /usr/bin/egrep '^@[0-9]+\([0-9]+\)[[:space:]].*[[:space:]]log[[:space:]]' | /usr/bin/egrep -v '^@[0-9]+\([0-9]+\)[[:space:]](nat|rdr|binat|no|scrub)'", $buffer);
	else
		$_gb = exec("/sbin/pfctl -vvPsr | /usr/bin/egrep '^@[0-9]+\([0-9]+\)[[:space:]].*[[:space:]]log[[:space:]]'", $buffer);

	if (is_array($buffer)) {
		foreach ($buffer as $line) {
			list($key, $value) = explode (" ", $line, 2);
			# pfctl rule number output with tracker number: @dd(dddddddddd)
			$matches = array();
			if (preg_match('/\@(?P<rulenum>\d+)\((?<trackernum>\d+)\)/', $key, $matches) == 1) {
				if ($matches['trackernum'] > 0)
					$key = $matches['trackernum'];
				else
					$key = "@{$matches['rulenum']}";
			}
			$buffer_rules_normal[$key] = $value;
		}
	}
	unset($_gb, $buffer);
}

function buffer_rules_clear() {
	unset($GLOBALS['buffer_rules_normal']);
	unset($GLOBALS['buffer_rules_rdr']);
}

function find_rule_by_number_buffer($rulenum, $trackernum, $type){
	global $g, $buffer_rules_rdr, $buffer_rules_normal;

	if ($trackernum == "0")
		$lookup_key = "@{$rulenum}";
	else
		$lookup_key = $trackernum;

	if ($type == "rdr")	{
		$ruleString = $buffer_rules_rdr[$lookup_key];
		//TODO: get the correct 'description' part of a RDR log line. currently just first 30 characters..
		$rulename = substr($ruleString,0,30);
	} else {
		$ruleString = $buffer_rules_normal[$lookup_key];
		list(,$rulename,) = explode("\"",$ruleString);
		$rulename = str_replace("USER_RULE: ",'<img src="/themes/'.$g['theme'].'/images/icons/icon_frmfld_user.png" width="11" height="12" title="USER_RULE" alt="USER_RULE"/> ',$rulename);
	}
	return "{$rulename} ({$lookup_key})";
}

function find_action_image($action) {
	global $g;
	if ((strstr(strtolower($action), "p")) || (strtolower($action) == "rdr"))
		return "/themes/{$g['theme']}/images/icons/icon_pass.gif";
	else if(strstr(strtolower($action), "r"))
		return "/themes/{$g['theme']}/images/icons/icon_reject.gif";
	else
		return "/themes/{$g['theme']}/images/icons/icon_block.gif";
}

/* AJAX specific handlers */
function handle_ajax($nentries, $tail = 50) {
	global $config;
	if($_GET['lastsawtime'] or $_POST['lastsawtime']) {
		global $filter_logfile,$filterent;
		if($_GET['lastsawtime'])
			$lastsawtime = $_GET['lastsawtime'];
		if($_POST['lastsawtime'])
			$lastsawtime = $_POST['lastsawtime'];
		/*  compare lastsawrule's time stamp to filter logs.
		 *  afterwards return the newer records so that client
		 *  can update AJAX interface screen.
		 */
		$new_rules = "";
		$filterlog = conv_log_filter($filter_logfile, $nentries, $tail);
		/* We need this to always be in forward order for the AJAX update to work properly */
		$filterlog = isset($config['syslog']['reverse']) ? array_reverse($filterlog) : $filterlog;
		foreach($filterlog as $log_row) {
			$row_time = strtotime($log_row['time']);
			$img = "<img border='0' src='" . find_action_image($log_row['act']) . "' alt={$log_row['act']} title={$log_row['act']} />";
			if($row_time > $lastsawtime) {
				if ($log_row['proto'] == "TCP")
					$log_row['proto'] .= ":{$log_row['tcpflags']}";

				$img = "<a href=\"#\" onClick=\"javascript:getURL('diag_logs_filter.php?getrulenum={$log_row['rulenum']},{$log_row['rulenum']}', outputrule);\">{$img}</a>";
				$new_rules .= "{$img}||{$log_row['time']}||{$log_row['interface']}||{$log_row['srcip']}||{$log_row['srcport']}||{$log_row['dstip']}||{$log_row['dstport']}||{$log_row['proto']}||{$log_row['version']}||" . time() . "||\n";
			}
		}
		echo $new_rules;
		exit;
	}
}

?>