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✏️ Editing: jhackguard.php

<?php
/**
 * @version     2.0.4
 * @package     plg_jhackguard
 * @copyright   Copyright (C) 2013. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 * @author      Valeri Markov <val@jhackguard.com> - http://www.jhackguard.com/
 */

defined('_JEXEC') or die;

/**
 * JHackGuard system plugin
 *
 * @package     plg_jhackguard
 */
class PlgSystemJhackguard extends JPlugin
{
    
    public $params; // Holds the com_jhackguard params
    public $log_level = 0; // 0 = none, 1 = standard, 2 = debug
    
    //IP Address check variables
    private $ip_checked = 0;
    private $ip_found = 0;
    private $ip_type = 'bl';
    
    public function __construct(&$subject, $config = array())
    {
        parent::__construct($subject, $config);
        
        //Since 2.0 version the plugin itself has no params
        //Instead we fetch the component parameters.
        $this->params = JComponentHelper::getParams('com_jhackguard');
        $this->log_level = $this->params->get('log_level',1);
    }
    
    protected function add_log($message, $severity)
    {
        /* Compare the system log level and the log request level*/
        $log_this = FALSE;
        switch($severity)
        {
            case "debug":
                if($this->log_level == 2)
                    $log_this = TRUE;
                    break;
            case "standard":
                if($this->log_level > 0)
                    $log_this = TRUE;
                    break;
        } 
        //Shall we log?
        if(!$log_this)
        {
            unset($log_this);
            return FALSE;
        }
        unset($log_this);
        //We shall log.
        $log_entry = new stdClass();
        $log_entry->message = $message;
        $log_entry->severity = ucfirst($severity);
        $log_entry->ip_address = $_SERVER['REMOTE_ADDR']; //TODO: Shouldn't we check this value first?
        
        return JFactory::getDbo()->insertObject('#__jhackguard_logs', $log_entry);
    }

function onAfterRender() {

//Run output filters. We do not wish these to be applied to the administrator section however
        //since replacing the data will break the functionality of the output filters option itself.
        $app = JFactory::getApplication();
        if ($app->isAdmin())
        {
            return true;
        }

$output = JResponse::getBody();
        
        // Get a db connection.
        $db = JFactory::getDbo();
        
        //Fetch the output filters from the database.
        $query = $db->getQuery(true);
        $query->select($db->quoteName(array('name','regex','replacement')));
        $query->from($db->quoteName('#__jhackguard_output_filters'));
        $query->where($db->quoteName('state') . ' = 1');
        $query->order('ordering ASC');
        $db->setQuery($query);
        $list = $db->loadObjectList();

foreach($list as $item)
        {
            //This holds the number of replacements.
            $count = 0;

//The actual replacement...
            $poutput = preg_replace($item->regex, $item->replacement, $output, -1, $count);
            if($poutput != NULL)
            {
                $output = $poutput;
                unset($poutput);
            }

//Check if we did any replacement.
            if($count > 0)
            {
                $this->add_log('Output filter "'.$item->name.'" matched '.$count.' time(s).','debug');
            }
        }
        //Set the changed body of the document.
        JResponse::setBody($output);
    }

public function onAfterInitialise($args=array())
    {
        //Are we enabled?
        if(!$this->params->get('enabled',1))
        {
            return 0;
        }

//DB item.
        $db = JFactory::getDbo();
        
        $this->add_log('JHackGuard initialised','debug');
        
        /* Maintenance steps start */
        $probability = rand(0,100);
        
        //Clear the expired logs (probability of running 10%)
        if($probability < 11)
        {
            $days = (int) $this->params->get('log_garbage_collection',7);
            if(!$days)
            {
                $days = 7;
            }
            $query = $db->getQuery(true);      
            $query->delete($db->quoteName('#__jhackguard_logs'));
            $query->where($db->quoteName('time') . ' < DATE_SUB(CURRENT_DATE, INTERVAL '.$days.' DAY)');
            $db->setQuery($query);
            $db->query();
            $this->add_log('Logs garbage collector ran.','debug');
        }
        
        //Clear the expired IP address filters (probability: 60%)
        if($probability < 61)
        {
            $query = $db->getQuery(true);      
            $query->delete($db->quoteName('#__jhackguard_ip_filters'));
            $query->where($db->quoteName('expires') . ' BETWEEN DATE_SUB(CURRENT_DATE, INTERVAL 36500 DAY) AND DATE_SUB(CURRENT_DATE, INTERVAL 1 DAY)');
            $db->setQuery($query);
            $db->query();
            $this->add_log('IP filters garbage collector ran.','debug');
        }
        /* Maintenance steps end */

/* Whitelisted Groups Check */
        $user = JFactory::getUser();
        $whg = $this->params->get('whitelisted_groups',array());
        foreach($user->groups as $g)
        {
            if(in_array($g, $whg))
            {
                $this->add_log('JHackGuard execution stopped because user group is whitelisted.','debug');
                return 0;
            }
        }
        
        /* IP black/white listing check */
        if($this->ip_is('whitelisted'))
        {
            //Cease further processing
            $this->add_log('Encountered whitelisted IP','debug');
            return 0;
        }
        
        if($this->ip_is('blacklisted'))
        {
            $this->add_log('Found blacklisted IP address. Script terminated.','standard');
            die(include_once(JPATH_ADMINISTRATOR.'/components/com_jhackguard/blocked.html'));
        }

/* Administrator secret key addon */
        if($this->params->get('admin_protection',0))
        {
            //Verify we have a secret word setup in the configuration.
            if(strlen($this->params->get('admin_keyword','')) < 1)
            {
                $this->add_log('Administrator folder protection enabled but no keyword found.','debug');
            } else {
                //Check if the current page is in the administrator area.
                if(JFactory::getApplication()->isAdmin() AND JFactory::getUser()->guest)
                {
                    if(is_array($_POST) AND isset($_POST['option']) AND $_POST['option'] == "com_login" AND isset($_POST['task']) AND $_POST['task'] == "login")
                    {
                        //This is post login processing script and we do not want to filter it. 
                        //TODO: check if we have actually came from a login page.
                        //Probably CSRF token would do the trick here.
                    } else {
                        if(!array_key_exists($this->params->get('admin_keyword',''),$_GET))
                        {
                            //We have no secret word added to the URL. Redirecting to main page.
                            $this->add_log('No admin keyword found in request to administrator folder. Redirecting to main page. ','debug');
                            header("Location: ".JURI::base()."..");
                            die();
                        }
                    }
                }
            }
        }
        /* Administrator secret word checks end */

/* Filter Administrator panel, jHackGuard pages. We do not want to filter our own content, after all */
	if(JFactory::getApplication()->isAdmin() AND !JFactory::getUser()->guest)
	{
		if(isset($_REQUEST['option']) AND $_REQUEST['option'] == "com_jhackguard")
		{
			$this->add_log('Admin page com_jhackguard is whitelisted. Filters skipped.','debug');
			return 0;
		}
	}
        
        /* Input filters Start */
        if(file_exists(JPATH_ADMINISTRATOR.'/components/com_jhackguard/data/input_rules.php') AND !file_exists(JPATH_ADMINISTRATOR.'/components/com_jhackguard/data/.disable_input_rules'))
        {
            require_once(JPATH_ADMINISTRATOR.'/components/com_jhackguard/data/input_rules.php');
            if (class_exists('JHackGuard_Input_Filters')) {
                $rules = new JHackGuard_Input_Filters();
                $rules->run();
            } else {
                $this->add_log('Cannot locate JHackGuard_Input_Filters class in data/input_rules.php. Perhaps no rules have been defined yet.','debug');
            }
            
        } else {
            $this->add_log('No input filters found or .disable_input_rules was defined.','debug');
        }
        /* End of Input filters */
        
        /* Scan through or disable the upload files, if configured */
        if($this->params->get('disable_uploads',0))
        {
            if(is_array($_FILES) AND count($_FILES) > 0)
            {
                JFactory::getApplication()->enqueueMessage("File upload denied by JHackGuard.","warning");
                $_FILES = array(); //TADAAA. This is not OK. We should probably delete the tmp files.
            }
        }

//Scan using or own rules.
        if($this->params->get('scan_uploads',1))
        {
            if(is_array($_FILES) AND count($_FILES) > 0 AND is_readable(JPATH_ADMINISTRATOR.'/components/com_jhackguard/data/scans/rules.php'))
            {
                foreach($_FILES as $key=>$file)
                {
                    $hit = 0;
                    if(isset($file['tmp_name']))
                    {
                        if(is_array($file['tmp_name']))
                        {
                            foreach($file['tmp_name'] as $tmp_file)
                            {
                                include_once(JPATH_ADMINISTRATOR.'/components/com_jhackguard/data/scans/rules.php');
                                $it = new SplFileInfo($tmp_file);
                                if($it->isFile() AND $it->isReadable())
                                {
                                    $s = new JHackGuard_OnDemand_Scan_Rules();
                                    $s->scan($it);
                                    if($s->score > 99)
                                    {
                                        $hit = 1;
                                        JFactory::getApplication()->enqueueMessage("File upload denied by JHackGuard. Internal scan hit.","warning");
                                        $this->add_log('Possible malicious file upload (score:'.$s->score.').File deleted.','standard');
                                    } else {
                                        $this->add_log('Clean file upload (score:'.$s->score.').','debug');
                                    }
                                }
                            }
                        }
                    }
                    //Do we have a hit?
                    if($hit)
                    {
                        unset($_FILES[$key]);
                    }                
                } //End foreach in $_FILES
            } 
        } //End if scan_uploads

//Scan using CYMRU Malware Hash Registry.
        if($this->params->get('use_cymru',1))
        {
            if(is_array($_FILES) AND count($_FILES) > 0)
            {
                foreach($_FILES as $key=>$file)
                {
                    $hit = 0;
                    if(isset($file['tmp_name']))
                    {
                        if(is_array($file['tmp_name']))
                        {
                            foreach($file['tmp_name'] as $tmp_file)
                            {
                                if($tmp_file != NULL)
                                {
                                    $hash = md5_file($tmp_file);
                                    if(checkdnsrr ($hash.".malware.hash.cymru.com.","A"))
                                    {
                                        JFactory::getApplication()->enqueueMessage("File upload denied by JHackGuard. Cymru malware hash database hit.","warning");
                                        $this->add_log('Possible malicious file upload (CYMRU Hash DB Hit).File deleted.','standard');
                                        $hit = 1;
                                    }
                                }
                            }
                        }
                    }
                    //Do we have a hit?
                    if($hit)
                    {
                        unset($_FILES[$key]);
                    }                
                } //End foreach in $_FILES
            }
        } //End if use_cymru option.

//END OF UPLOADED FILES CHECKS
    }
    
    public function ip_is($type)
    {
        if($this->ip_checked)
        {
            //We already checked this IP address. No need to query the DB again.
            if($this->ip_found)
            {
                return ($type == $this->ip_type ? TRUE : FALSE);    
            } else {
                return FALSE;
            }
        }
        
        // Get a db connection.
        $db = JFactory::getDbo();
        
        // Create a new query object.
        $query = $db->getQuery(true);
        $query->select($db->quoteName(array('state', 'rule_type')));
        $query->from($db->quoteName('#__jhackguard_ip_filters'));
        $query->where($db->quoteName('ip') . ' = '. $db->quote($_SERVER['REMOTE_ADDR']));
        $query->where($db->quoteName('state') . ' = 1');
        $query->order('ordering ASC');
        
        $db->setQuery($query);
        $result = $db->loadObject();        
        
        if(is_null($result))
        {
            //No such record found
            $this->ip_checked = TRUE;
            $this->ip_found = FALSE;
        } 
        else 
        {
            $this->ip_checked = TRUE;
            $this->ip_found = TRUE;
            if($result->rule_type == 'wl'){
                $this->ip_type = 'whitelisted';
            } else {
                $this->ip_type = 'blacklisted';
            }
        }
        unset($query,$result);
        return $this->ip_is($type);
    }
}
//End of file: jhackguard.php
//Location: plugins/system/jhackguard/

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