682 lines
18 KiB
PHP
682 lines
18 KiB
PHP
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<?php
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/**
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* PHPIDS
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*
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* Requirements: PHP5, SimpleXML
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*
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* Copyright (c) 2008 PHPIDS group (http://php-ids.org)
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*
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* PHPIDS is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, version 3 of the License, or
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* (at your option) any later version.
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*
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* PHPIDS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with PHPIDS. If not, see <http://www.gnu.org/licenses/>.
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*
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* PHP version 5.1.6+
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*
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* @category Security
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* @package PHPIDS
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* @author Mario Heiderich <mario.heiderich@gmail.com>
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* @author Christian Matthies <ch0012@gmail.com>
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* @author Lars Strojny <lars@strojny.net>
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* @license http://www.gnu.org/licenses/lgpl.html LGPL
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* @link http://php-ids.org/
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*/
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/**
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* Monitoring engine
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*
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* This class represents the core of the frameworks attack detection mechanism
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* and provides functions to scan incoming data for malicious appearing script
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* fragments.
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*
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* @category Security
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* @package PHPIDS
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* @author Christian Matthies <ch0012@gmail.com>
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* @author Mario Heiderich <mario.heiderich@gmail.com>
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* @author Lars Strojny <lars@strojny.net>
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* @copyright 2007 The PHPIDS Group
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* @license http://www.gnu.org/licenses/lgpl.html LGPL
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* @version Release: $Id:Monitor.php 949 2008-06-28 01:26:03Z christ1an $
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* @link http://php-ids.org/
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*/
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class IDS_Monitor
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{
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/**
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* Tags to define what to search for
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*
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* Accepted values are xss, csrf, sqli, dt, id, lfi, rfe, spam, dos
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*
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* @var array
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*/
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private $tags = null;
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/**
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* Request array
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*
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* Array containing raw data to search in
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*
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* @var array
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*/
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private $request = null;
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/**
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* Container for filter rules
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*
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* Holds an instance of IDS_Filter_Storage
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*
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* @var object
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*/
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private $storage = null;
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/**
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* Results
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*
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* Holds an instance of IDS_Report which itself provides an API to
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* access the detected results
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*
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* @var object
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*/
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private $report = null;
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/**
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* Scan keys switch
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*
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* Enabling this property will cause the monitor to scan both the key and
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* the value of variables
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*
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* @var boolean
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*/
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public $scanKeys = false;
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/**
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* Exception container
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*
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* Using this array it is possible to define variables that must not be
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* scanned. Per default, utmz google analytics parameters are permitted.
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*
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* @var array
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*/
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private $exceptions = array();
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/**
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* Html container
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*
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* Using this array it is possible to define variables that legally
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* contain html and have to be prepared before hitting the rules to
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* avoid too many false alerts
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*
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* @var array
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*/
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private $html = array();
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/**
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* JSON container
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*
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* Using this array it is possible to define variables that contain
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* JSON data - and should be treated as such
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*
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* @var array
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*/
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private $json = array();
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/**
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* Holds HTMLPurifier object
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*
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* @var object
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*/
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private $htmlpurifier = NULL;
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/**
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* Path to HTMLPurifier source
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*
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* This path might be changed in case one wishes to make use of a
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* different HTMLPurifier source file e.g. if already used in the
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* application PHPIDS is protecting
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*
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* @var string
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*/
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private $pathToHTMLPurifier = '';
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/**
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* HTMLPurifier cache directory
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*
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* @var string
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*/
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private $HTMLPurifierCache = '';
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/**
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* This property holds the tmp JSON string from the
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* _jsonDecodeValues() callback
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*
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* @var string
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*/
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private $tmpJsonString = '';
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/**
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* Constructor
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*
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* @param array $request array to scan
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* @param object $init instance of IDS_Init
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* @param array $tags list of tags to which filters should be applied
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*
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* @return void
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*/
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public function __construct(array $request, IDS_Init $init, array $tags = null)
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{
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$version = isset($init->config['General']['min_php_version'])
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? $init->config['General']['min_php_version'] : '5.1.6';
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if (version_compare(PHP_VERSION, $version, '<')) {
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throw new Exception(
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'PHP version has to be equal or higher than ' . $version . ' or
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PHP version couldn\'t be determined'
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);
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}
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if (!empty($request)) {
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$this->storage = new IDS_Filter_Storage($init);
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$this->request = $request;
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$this->tags = $tags;
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$this->scanKeys = $init->config['General']['scan_keys'];
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$this->exceptions = isset($init->config['General']['exceptions'])
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? $init->config['General']['exceptions'] : false;
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$this->html = isset($init->config['General']['html'])
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? $init->config['General']['html'] : false;
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$this->json = isset($init->config['General']['json'])
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? $init->config['General']['json'] : false;
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if(isset($init->config['General']['HTML_Purifier_Path'])
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&& isset($init->config['General']['HTML_Purifier_Cache'])) {
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$this->pathToHTMLPurifier =
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$init->config['General']['HTML_Purifier_Path'];
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$this->HTMLPurifierCache =
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$init->config['General']['HTML_Purifier_Cache'];
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}
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}
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if (!is_writeable($init->getBasePath()
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. $init->config['General']['tmp_path'])) {
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throw new Exception(
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'Please make sure the ' .
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htmlspecialchars($init->getBasePath() .
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$init->config['General']['tmp_path'], ENT_QUOTES, 'UTF-8') .
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' folder is writable'
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);
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}
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include_once 'IDS/Report.php';
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$this->report = new IDS_Report;
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}
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/**
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* Starts the scan mechanism
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*
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* @return object IDS_Report
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*/
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public function run()
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{
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if (!empty($this->request)) {
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foreach ($this->request as $key => $value) {
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$this->_iterate($key, $value);
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}
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}
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return $this->getReport();
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}
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/**
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* Iterates through given data and delegates it to IDS_Monitor::_detect() in
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* order to check for malicious appearing fragments
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*
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* @param mixed $key the former array key
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* @param mixed $value the former array value
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*
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* @return void
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*/
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private function _iterate($key, $value)
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{
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if (!is_array($value)) {
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if (is_string($value)) {
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if ($filter = $this->_detect($key, $value)) {
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include_once 'IDS/Event.php';
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$this->report->addEvent(
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new IDS_Event(
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$key,
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$value,
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$filter
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)
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);
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}
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}
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} else {
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foreach ($value as $subKey => $subValue) {
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$this->_iterate($key . '.' . $subKey, $subValue);
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}
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}
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}
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/**
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* Checks whether given value matches any of the supplied filter patterns
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*
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* @param mixed $key the key of the value to scan
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* @param mixed $value the value to scan
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*
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* @return bool|array false or array of filter(s) that matched the value
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*/
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private function _detect($key, $value)
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{
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// to increase performance, only start detection if value
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// isn't alphanumeric
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if (!$value || !preg_match('/[^\w\s\/@!?,\.]+|(?:\.\/)|(?:@@\w+)/', $value)) {
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return false;
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}
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// check if this field is part of the exceptions
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if (is_array($this->exceptions)
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&& in_array($key, $this->exceptions, true)) {
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return false;
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}
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// check for magic quotes and remove them if necessary
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if (function_exists('get_magic_quotes_gpc')
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&& get_magic_quotes_gpc()) {
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$value = stripslashes($value);
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}
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// if html monitoring is enabled for this field - then do it!
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if (is_array($this->html) && in_array($key, $this->html, true)) {
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list($key, $value) = $this->_purifyValues($key, $value);
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}
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// check if json monitoring is enabled for this field
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if (is_array($this->json) && in_array($key, $this->json, true)) {
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list($key, $value) = $this->_jsonDecodeValues($key, $value);
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}
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// use the converter
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include_once 'IDS/Converter.php';
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$value = IDS_Converter::runAll($value);
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$value = IDS_Converter::runCentrifuge($value, $this);
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// scan keys if activated via config
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$key = $this->scanKeys ? IDS_Converter::runAll($key)
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: $key;
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$key = $this->scanKeys ? IDS_Converter::runCentrifuge($key, $this)
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: $key;
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$filters = array();
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$filterSet = $this->storage->getFilterSet();
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foreach ($filterSet as $filter) {
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/*
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* in case we have a tag array specified the IDS will only
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* use those filters that are meant to detect any of the
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* defined tags
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*/
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if (is_array($this->tags)) {
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if (array_intersect($this->tags, $filter->getTags())) {
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if ($this->_match($key, $value, $filter)) {
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$filters[] = $filter;
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}
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}
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} else {
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if ($this->_match($key, $value, $filter)) {
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$filters[] = $filter;
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}
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}
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}
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return empty($filters) ? false : $filters;
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}
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/**
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* Purifies given key and value variables using HTMLPurifier
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*
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* This function is needed whenever there is variables for which HTML
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* might be allowed like e.g. WYSIWYG post bodies. It will dectect malicious
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* code fragments and leaves harmless parts untouched.
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*
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* @param mixed $key
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* @param mixed $value
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* @since 0.5
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*
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* @return array
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*/
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private function _purifyValues($key, $value) {
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include_once $this->pathToHTMLPurifier;
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if (!is_writeable($this->HTMLPurifierCache)) {
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throw new Exception(
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$this->HTMLPurifierCache . ' must be writeable');
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}
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if (class_exists('HTMLPurifier')) {
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$config = HTMLPurifier_Config::createDefault();
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$config->set('Attr', 'EnableID', true);
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$config->set('Cache', 'SerializerPath', $this->HTMLPurifierCache);
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$config->set('Output', 'Newline', "\n");
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$this->htmlpurifier = new HTMLPurifier($config);
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} else {
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throw new Exception(
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'HTMLPurifier class could not be found - ' .
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'make sure the purifier files are valid and' .
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' the path is correct'
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);
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}
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$purified_value = $this->htmlpurifier->purify($value);
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$purified_key = $this->htmlpurifier->purify($key);
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$redux_value = strip_tags($value);
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$redux_key = strip_tags($key);
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if ($value != $purified_value || $redux_value) {
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$value = $this->_diff($value, $purified_value, $redux_value);
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} else {
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$value = NULL;
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}
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if ($key != $purified_key) {
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$key = $this->_diff($key, $purified_key, $redux_key);
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} else {
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$key = NULL;
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|
}
|
||
|
|
|
||
|
|
return array($key, $value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This method calculates the difference between the original
|
||
|
|
* and the purified markup strings.
|
||
|
|
*
|
||
|
|
* @param string $original the original markup
|
||
|
|
* @param string $purified the purified markup
|
||
|
|
* @param string $redux the string without html
|
||
|
|
* @since 0.5
|
||
|
|
*
|
||
|
|
* @return string the difference between the strings
|
||
|
|
*/
|
||
|
|
private function _diff($original, $purified, $redux)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* deal with over-sensitive alt-attribute addition of the purifier
|
||
|
|
* and other common html formatting problems
|
||
|
|
*/
|
||
|
|
$purified = preg_replace('/\s+alt="[^"]*"/m', null, $purified);
|
||
|
|
$purified = preg_replace('/=?\s*"\s*"/m', null, $purified);
|
||
|
|
|
||
|
|
$original = preg_replace('/=?\s*"\s*"/m', null, $original);
|
||
|
|
$original = preg_replace('/\s+alt=?/m', null, $original);
|
||
|
|
|
||
|
|
// check which string is longer
|
||
|
|
$length = (strlen($original) - strlen($purified));
|
||
|
|
/*
|
||
|
|
* Calculate the difference between the original html input
|
||
|
|
* and the purified string.
|
||
|
|
*/
|
||
|
|
if ($length > 0) {
|
||
|
|
$array_2 = str_split($original);
|
||
|
|
$array_1 = str_split($purified);
|
||
|
|
} else {
|
||
|
|
$array_1 = str_split($original);
|
||
|
|
$array_2 = str_split($purified);
|
||
|
|
}
|
||
|
|
foreach ($array_2 as $key => $value) {
|
||
|
|
if ($value !== $array_1[$key]) {
|
||
|
|
$array_1 = array_reverse($array_1);
|
||
|
|
$array_1[] = $value;
|
||
|
|
$array_1 = array_reverse($array_1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// return the diff - ready to hit the converter and the rules
|
||
|
|
$diff = trim(join('', array_reverse(
|
||
|
|
(array_slice($array_1, 0, $length)))));
|
||
|
|
|
||
|
|
// clean up spaces between tag delimiters
|
||
|
|
$diff = preg_replace('/>\s*</m', '><', $diff);
|
||
|
|
|
||
|
|
// correct over-sensitively stripped bad html elements
|
||
|
|
$diff = preg_replace('/[^<](iframe|script|embed|object' .
|
||
|
|
'|applet|base|img|style)/m', '<$1', $diff);
|
||
|
|
|
||
|
|
if ($original == $purified && !$redux) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $diff . $redux;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This method prepares incoming JSON data for the PHPIDS detection
|
||
|
|
* process. It utilizes _jsonConcatContents() as callback and returns a
|
||
|
|
* string version of the JSON data structures.
|
||
|
|
*
|
||
|
|
* @param mixed $key
|
||
|
|
* @param mixed $value
|
||
|
|
* @since 0.5.3
|
||
|
|
*
|
||
|
|
* @return array
|
||
|
|
*/
|
||
|
|
private function _jsonDecodeValues($key, $value) {
|
||
|
|
|
||
|
|
$tmp_key = json_decode($key);
|
||
|
|
$tmp_value = json_decode($value);
|
||
|
|
|
||
|
|
if($tmp_value && is_array($tmp_value) || is_object($tmp_value)) {
|
||
|
|
array_walk_recursive($tmp_value, array($this, '_jsonConcatContents'));
|
||
|
|
$value = $this->tmpJsonString;
|
||
|
|
}
|
||
|
|
|
||
|
|
if($tmp_key && is_array($tmp_key) || is_object($tmp_key)) {
|
||
|
|
array_walk_recursive($tmp_key, array($this, '_jsonConcatContents'));
|
||
|
|
$key = $this->tmpJsonString;
|
||
|
|
}
|
||
|
|
|
||
|
|
return array($key, $value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This is the callback used in _jsonDecodeValues(). The method
|
||
|
|
* concatenates key and value and stores them in $this->tmpJsonString.
|
||
|
|
*
|
||
|
|
* @param mixed $key
|
||
|
|
* @param mixed $value
|
||
|
|
* @since 0.5.3
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
private function _jsonConcatContents($key, $value) {
|
||
|
|
|
||
|
|
$this->tmpJsonString .= $key . " " . $value . "\n";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Matches given value and/or key against given filter
|
||
|
|
*
|
||
|
|
* @param mixed $key the key to optionally scan
|
||
|
|
* @param mixed $value the value to scan
|
||
|
|
* @param object $filter the filter object
|
||
|
|
*
|
||
|
|
* @return boolean
|
||
|
|
*/
|
||
|
|
private function _match($key, $value, $filter)
|
||
|
|
{
|
||
|
|
if ($this->scanKeys) {
|
||
|
|
if ($filter->match($key)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($filter->match($value)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Sets exception array
|
||
|
|
*
|
||
|
|
* @param mixed $exceptions the thrown exceptions
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function setExceptions($exceptions)
|
||
|
|
{
|
||
|
|
if (!is_array($exceptions)) {
|
||
|
|
$exceptions = array($exceptions);
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->exceptions = $exceptions;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns exception array
|
||
|
|
*
|
||
|
|
* @return array
|
||
|
|
*/
|
||
|
|
public function getExceptions()
|
||
|
|
{
|
||
|
|
return $this->exceptions;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Sets html array
|
||
|
|
*
|
||
|
|
* @param mixed $html the fields containing html
|
||
|
|
* @since 0.5
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function setHtml($html)
|
||
|
|
{
|
||
|
|
if (!is_array($html)) {
|
||
|
|
$html = array($html);
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->html = $html;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Adds a value to the html array
|
||
|
|
*
|
||
|
|
* @since 0.5
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function addHtml($value)
|
||
|
|
{
|
||
|
|
$this->html[] = $value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns html array
|
||
|
|
*
|
||
|
|
* @since 0.5
|
||
|
|
*
|
||
|
|
* @return array the fields that contain allowed html
|
||
|
|
*/
|
||
|
|
public function getHtml()
|
||
|
|
{
|
||
|
|
return $this->html;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Sets json array
|
||
|
|
*
|
||
|
|
* @param mixed $json the fields containing json
|
||
|
|
* @since 0.5.3
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function setJson($json)
|
||
|
|
{
|
||
|
|
if (!is_array($json)) {
|
||
|
|
$json = array($json);
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->json = $json;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Adds a value to the json array
|
||
|
|
*
|
||
|
|
* @since 0.5.3
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function addJson($value)
|
||
|
|
{
|
||
|
|
$this->json[] = $value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns json array
|
||
|
|
*
|
||
|
|
* @since 0.5.3
|
||
|
|
*
|
||
|
|
* @return array the fields that contain json
|
||
|
|
*/
|
||
|
|
public function getJson()
|
||
|
|
{
|
||
|
|
return $this->json;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns storage container
|
||
|
|
*
|
||
|
|
* @return array
|
||
|
|
*/
|
||
|
|
public function getStorage()
|
||
|
|
{
|
||
|
|
return $this->storage;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns report object providing various functions to work with
|
||
|
|
* detected results. Also the centrifuge data is being set as property
|
||
|
|
* of the report object.
|
||
|
|
*
|
||
|
|
* @return object IDS_Report
|
||
|
|
*/
|
||
|
|
public function getReport()
|
||
|
|
{
|
||
|
|
if (isset($this->centrifuge) && $this->centrifuge) {
|
||
|
|
$this->report->setCentrifuge($this->centrifuge);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->report;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Local variables:
|
||
|
|
* tab-width: 4
|
||
|
|
* c-basic-offset: 4
|
||
|
|
* End:
|
||
|
|
* vim600: sw=4 ts=4 expandtab
|
||
|
|
*/
|