代码之家  ›  专栏  ›  技术社区  ›  Spencer Ruport

防止XSS的可靠方法?

  •  2
  • Spencer Ruport  · 技术社区  · 15 年前

    我已经看过这些问题,但还没有看到有人问这个问题。

    在某些用户提交的内容中,删除任何类型XSS尝试的“确定”方法是什么?我知道 < > 应转换为 &lt; &gt; 但我听说编码差异也可以解决这个问题。

    假设有一个白名单,那么要完全清除一些用户提交的内容以确保不存在XSS漏洞,所有的步骤是什么?

    6 回复  |  直到 11 年前
        1
  •  5
  •   Henri    15 年前

    因为人们每天都会发现新的攻击向量,所以没有绝对的安全概念XSS。有时候,XSS甚至是一个你不能做任何事情的浏览器错误(超出了一些解决方法)。

    要了解复杂性的概念,请查看这个(不完整的)XSS攻击备忘表。

    http://ha.ckers.org/xss.html

    你应该让自己成为一个XSS专家或者雇佣一个来达到你的目标。

    你可以从上面给出的链接开始检查攻击向量,试着理解为什么它可以工作,并确保你能阻止它。

    另一个防止XSS的好方法是确保你只接受你期望的东西,而不是阻止你知道不好的东西。(即白名单而非黑名单)

        2
  •  5
  •   dusoft    15 年前

    http://htmlpurifier.org/ -HTM净化器可能有帮助

    附言:不要创建自己的代码,你不可能覆盖所有的问题。依赖于不断开发的库,如html净化器。

        3
  •  3
  •   Joergi    12 年前

    老问题,但XSS不是老问题,它仍然是最新的……

    所以,我建议你去看看 OWASP XSS Prevention Cheat Sheet 为了全面了解 OWASP XSS overview

    如果你需要一个很好的逃跑方法,就去看看 ESAPI Encoder API

        4
  •  2
  •   googletorp    15 年前

    我在不同的框架中看到的一些漏洞是如此的不真实,我不知道它们是如何被发现的。如果你想100%确定不要让用户发布内容。

        5
  •  0
  •   Dan Davies Brackett    15 年前

    证明一个否定的命题是一个困难的命题——正如谷歌公司指出的,唯一100%的解决方案是首先不要有这个问题。

    在功能上, xss attack cheat sheet at ha.ckers.org 是一个很好的开始的地方,就像白名单方法一样——不要拒绝已知的不好的东西,只允许已知的好的东西。

        6
  •  0
  •   dazzafact    11 年前

    PHP防火墙 抗XSS等

    http://www.php-firewall.info/ http://code.google.com/p/php-防火墙/

                <?php
            /************************************************************************/
            /* PHP Firewall: Universal Firewall for WebSite                         */
            /* ============================================                         */
            /* Write by Cyril Levert                                                */
            /* Copyright (c) 2009-2010                                              */
            /* http://www.php-firewall.info                                         */
            /* dev@php-maximus.org                                                  */
            /* Others projects:                                                     */
            /* CMS PHP Maximus ( with mysql database ) www.php-maximus.org          */
            /* Blog PHP Minimus ( with mysqli database ) www.php-minimus.org        */
            /* Mini CMS PHP Nanomus ( without database ) www.php-nanomus.org        */
            /* Stop Spam Referer ( without database ) www.stop-spam-referer.info    */
            /* Twitter clone ( PHP Kweeker CMS ) www.twitter.php-minimus.org        */
            /* PHP Firewall ( without database ) www.php-firewall.info              */
            /* Personnal blog www.cyril-levert.info                                 */
            /* Release version 1.0.3                                                */
            /* Release date : 12-04-2010                                            */
            /*                                                                      */
            /* This program is free software.                                       */
            /************************************************************************/
    
            /** IP Protected */
            $IP_ALLOW = array();
    
            /** configuration define */
            define('PHP_FIREWALL_LANGUAGE', 'english' );
            define('PHP_FIREWALL_ADMIN_MAIL', '' );
            define('PHP_FIREWALL_PUSH_MAIL', false );
            define('PHP_FIREWALL_LOG_FILE', 'logs' );
            define('PHP_FIREWALL_PROTECTION_UNSET_GLOBALS', true );
            define('PHP_FIREWALL_PROTECTION_RANGE_IP_DENY', true );
            define('PHP_FIREWALL_PROTECTION_RANGE_IP_SPAM', false );
            define('PHP_FIREWALL_PROTECTION_URL', true );
            define('PHP_FIREWALL_PROTECTION_REQUEST_SERVER', true );
            define('PHP_FIREWALL_PROTECTION_SANTY', true );
            define('PHP_FIREWALL_PROTECTION_BOTS', true );
            define('PHP_FIREWALL_PROTECTION_REQUEST_METHOD', true );
            define('PHP_FIREWALL_PROTECTION_DOS', true );
            define('PHP_FIREWALL_PROTECTION_UNION_SQL', true );
            define('PHP_FIREWALL_PROTECTION_CLICK_ATTACK', true );
            define('PHP_FIREWALL_PROTECTION_XSS_ATTACK', true );
            define('PHP_FIREWALL_PROTECTION_COOKIES', false );
            define('PHP_FIREWALL_PROTECTION_POST', false );
            define('PHP_FIREWALL_PROTECTION_GET', false );
            define('PHP_FIREWALL_PROTECTION_SERVER_OVH', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_KIMSUFI', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_DEDIBOX', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_DIGICUBE', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_OVH_BY_IP', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_KIMSUFI_BY_IP', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_DEDIBOX_BY_IP', true );
            define('PHP_FIREWALL_PROTECTION_SERVER_DIGICUBE_BY_IP', true );
            /** end configuration */
    
            /** IPS PROTECTED */
            if ( count( $IP_ALLOW ) > 0 ) {
                if ( in_array( $_SERVER['REMOTE_ADDR'], $IP_ALLOW ) ) return;
            }
            /** END IPS PROTECTED */
    
    
            /** LANGUAGE */
            if ( PHP_FIREWALL_LANGUAGE === 'french' ) {
                define('_PHPF_PROTECTION_DEDIBOX', 'Protection contre les serveurs DEDIBOX active, cette IP range n\'est pas autorisée !');
                define('_PHPF_PROTECTION_DEDIBOX_IP', 'Protection contre les serveurs DEDIBOX active, cette IP range n\'est pas autorisée !');
    
                define('_PHPF_PROTECTION_DIGICUBE', 'Protection contre les serveurs DIGICUBE active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_DIGICUBE_IP', 'Protection contre les serveurs DIGICUBE active, cette IP n\'est pas autorisée !');
    
                define('_PHPF_PROTECTION_KIMSUFI', 'Protection contre les serveurs KIMSUFI active, cette IP range n\'est pas autorisée !');
                define('_PHPF_PROTECTION_OVH', 'Protection contre les serveurs OVH active, cette IP range n\'est pas autorisée !');
    
                define('_PHPF_PROTECTION_BOTS', 'Attaque Bot détectée ! stop it ...');
                define('_PHPF_PROTECTION_CLICK', 'Click attaque détectée ! stop it .....');
                define('_PHPF_PROTECTION_DOS', 'Invalide user agent ! Stop it ...');
                define('_PHPF_PROTECTION_OTHER_SERVER', 'Poster depuis un autre serveur est interdit !');
                define('_PHPF_PROTECTION_REQUEST', 'Méthode de requête interdite ! Stop it ...');
                define('_PHPF_PROTECTION_SANTY', 'Attaque Santy detectée ! Stop it ...');
                define('_PHPF_PROTECTION_SPAM', 'Protection SPAM IPs active, cette IP range n\'est pas autorisée !');
                define('_PHPF_PROTECTION_SPAM_IP', 'Protection SPAM IPs active, cette IP range n\'est pas autorisée !');
                define('_PHPF_PROTECTION_UNION', 'Attaque Union détectée ! stop it ......');
                define('_PHPF_PROTECTION_URL', 'Protection url active, string non autorisée !');
                define('_PHPF_PROTECTION_XSS', 'Attaque XSS détectée ! stop it ...');
            } else {
                define('_PHPF_PROTECTION_DEDIBOX', 'Protection DEDIBOX Server active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_DEDIBOX_IP', 'Protection DEDIBOX Server active, this IP is not allowed !');
    
                define('_PHPF_PROTECTION_DIGICUBE', 'Protection DIGICUBE Server active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_DIGICUBE_IP', 'Protection DIGICUBE Server active, this IP is not allowed !');
    
                define('_PHPF_PROTECTION_KIMSUFI', 'Protection KIMSUFI Server active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_OVH', 'Protection OVH Server active, this IP range is not allowed !');
    
                define('_PHPF_PROTECTION_BOTS', 'Bot attack detected ! stop it ...');
                define('_PHPF_PROTECTION_CLICK', 'Click attack detected ! stop it .....');
                define('_PHPF_PROTECTION_DOS', 'Invalid user agent ! Stop it ...');
                define('_PHPF_PROTECTION_OTHER_SERVER', 'Posting from another server not allowed !');
                define('_PHPF_PROTECTION_REQUEST', 'Invalid request method check ! Stop it ...');
                define('_PHPF_PROTECTION_SANTY', 'Attack Santy detected ! Stop it ...');
                define('_PHPF_PROTECTION_SPAM', 'Protection SPAM IPs active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_SPAM_IP', 'Protection died IPs active, this IP range is not allowed !');
                define('_PHPF_PROTECTION_UNION', 'Union attack detected ! stop it ......');
                define('_PHPF_PROTECTION_URL', 'Protection url active, string not allowed !');
                define('_PHPF_PROTECTION_XSS', 'XSS attack detected ! stop it ...');
            }
            /** END LANGUAGE*/
    
    
            if ( PHP_FIREWALL_ACTIVATION === true ) {
    
                FUNCTION PHP_FIREWALL_unset_globals() {
                    if ( ini_get('register_globals') ) {
                        $allow = array('_ENV' => 1, '_GET' => 1, '_POST' => 1, '_COOKIE' => 1, '_FILES' => 1, '_SERVER' => 1, '_REQUEST' => 1, 'GLOBALS' => 1);
                        foreach ($GLOBALS as $key => $value) {
                            if ( ! isset( $allow[$key] ) ) unset( $GLOBALS[$key] );
                        }
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_UNSET_GLOBALS === true ) PHP_FIREWALL_unset_globals();
    
                /** fonctions de base */
                FUNCTION PHP_FIREWALL_get_env($st_var) {
                    global $HTTP_SERVER_VARS;
                    if(isset($_SERVER[$st_var])) {
                        return strip_tags( $_SERVER[$st_var] );
                    } elseif(isset($_ENV[$st_var])) {
                        return strip_tags( $_ENV[$st_var] );
                    } elseif(isset($HTTP_SERVER_VARS[$st_var])) {
                        return strip_tags( $HTTP_SERVER_VARS[$st_var] );
                    } elseif(getenv($st_var)) {
                        return strip_tags( getenv($st_var) );
                    } elseif(function_exists('apache_getenv') && apache_getenv($st_var, true)) {
                        return strip_tags( apache_getenv($st_var, true) );
                    }
                    return '';
                }
    
                FUNCTION PHP_FIREWALL_get_referer() {
                    if( PHP_FIREWALL_get_env('HTTP_REFERER') )
                        return PHP_FIREWALL_get_env('HTTP_REFERER');
                    return 'no referer';
                }
    
                FUNCTION PHP_FIREWALL_get_ip() {
                    if ( PHP_FIREWALL_get_env('HTTP_X_FORWARDED_FOR') ) {
                        return PHP_FIREWALL_get_env('HTTP_X_FORWARDED_FOR');
                    } elseif ( PHP_FIREWALL_get_env('HTTP_CLIENT_IP') ) {
                        return PHP_FIREWALL_get_env('HTTP_CLIENT_IP');
                    } else {
                        return PHP_FIREWALL_get_env('REMOTE_ADDR');
                    }
                }
                FUNCTION PHP_FIREWALL_get_user_agent() {
                    if(PHP_FIREWALL_get_env('HTTP_USER_AGENT'))
                        return PHP_FIREWALL_get_env('HTTP_USER_AGENT');
                    return 'none';
                }
    
                FUNCTION PHP_FIREWALL_get_query_string() {
                    if( PHP_FIREWALL_get_env('QUERY_STRING') )
                        return str_replace('%09', '%20', PHP_FIREWALL_get_env('QUERY_STRING'));
                    return '';
                }
                FUNCTION PHP_FIREWALL_get_request_method() {
                    if(PHP_FIREWALL_get_env('REQUEST_METHOD'))
                        return PHP_FIREWALL_get_env('REQUEST_METHOD');
                    return 'none';
                }
                FUNCTION PHP_FIREWALL_gethostbyaddr() {
                    if ( PHP_FIREWALL_PROTECTION_SERVER_OVH === true OR PHP_FIREWALL_PROTECTION_SERVER_KIMSUFI === true OR PHP_FIREWALL_PROTECTION_SERVER_DEDIBOX === true OR PHP_FIREWALL_PROTECTION_SERVER_DIGICUBE === true ) {
                        if ( @ empty( $_SESSION['PHP_FIREWALL_gethostbyaddr'] ) ) {
                            return $_SESSION['PHP_FIREWALL_gethostbyaddr'] = @gethostbyaddr( PHP_FIREWALL_get_ip() );
                        } else {
                            return strip_tags( $_SESSION['PHP_FIREWALL_gethostbyaddr'] );
                        }
                    }
                }
    
                /** bases define */
                define('PHP_FIREWALL_GET_QUERY_STRING', strtolower( PHP_FIREWALL_get_query_string() ) );
                define('PHP_FIREWALL_USER_AGENT', PHP_FIREWALL_get_user_agent() );
                define('PHP_FIREWALL_GET_IP', PHP_FIREWALL_get_ip() );
                define('PHP_FIREWALL_GET_HOST', PHP_FIREWALL_gethostbyaddr() );
                define('PHP_FIREWALL_GET_REFERER', PHP_FIREWALL_get_referer() );
                define('PHP_FIREWALL_GET_REQUEST_METHOD', PHP_FIREWALL_get_request_method() );
                define('PHP_FIREWALL_REGEX_UNION','#\w?\s?union\s\w*?\s?(select|all|distinct|insert|update|drop|delete)#is');
                FUNCTION PHP_FIREWALL_push_email( $subject, $msg ) {
                    $headers = "From: PHP Firewall: ".PHP_FIREWALL_ADMIN_MAIL." <".PHP_FIREWALL_ADMIN_MAIL.">\r\n"
                        ."Reply-To: ".PHP_FIREWALL_ADMIN_MAIL."\r\n"
                        ."Priority: urgent\r\n"
                        ."Importance: High\r\n"
                        ."Precedence: special-delivery\r\n"
                        ."Organization: PHP Firewall\r\n"
                        ."MIME-Version: 1.0\r\n"
                        ."Content-Type: text/plain\r\n"
                        ."Content-Transfer-Encoding: 8bit\r\n"
                        ."X-Priority: 1\r\n"
                        ."X-MSMail-Priority: High\r\n"
                        ."X-Mailer: PHP/" . phpversion() ."\r\n"
                        ."X-PHPFirewall: 1.0 by PHPFirewall\r\n"
                        ."Date:" . date("D, d M Y H:s:i") . " +0100\n";
                    if ( PHP_FIREWALL_ADMIN_MAIL != '' )
                        @mail( PHP_FIREWALL_ADMIN_MAIL, $subject, $msg, $headers );
                }
    
                FUNCTION PHP_FIREWALL_LOGS( $type ) {
                    $f = fopen( dirname(__FILE__).'/'.PHP_FIREWALL_LOG_FILE.'.txt', 'a');
                    $msg = date('j-m-Y H:i:s')." | $type | IP: ".PHP_FIREWALL_GET_IP." ] | DNS: ".gethostbyaddr(PHP_FIREWALL_GET_IP)." | Agent: ".PHP_FIREWALL_USER_AGENT." | URL: ".PHP_FIREWALL_REQUEST_URI." | Referer: ".PHP_FIREWALL_GET_REFERER."\n\n";
                    fputs($f, $msg);
                    fclose($f);
                    if ( PHP_FIREWALL_PUSH_MAIL === true ) {
                        PHP_FIREWALL_push_email( 'Alert PHP Firewall '.strip_tags( $_SERVER['SERVER_NAME'] ) , "PHP Firewall logs of ".strip_tags( $_SERVER['SERVER_NAME'] )."\n".str_replace('|', "\n", $msg ) );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_OVH === true ) {
                    if ( stristr( PHP_FIREWALL_GET_HOST ,'ovh') ) {
                        PHP_FIREWALL_LOGS( 'OVH Server list' );
                        die( _PHPF_PROTECTION_OVH );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_OVH_BY_IP === true ) {
                    $ip = explode('.', PHP_FIREWALL_GET_IP );
                    if ( $ip[0].'.'.$ip[1] == '87.98' or  $ip[0].'.'.$ip[1] == '91.121' or  $ip[0].'.'.$ip[1] == '94.23' or $ip[0].'.'.$ip[1] == '213.186' or  $ip[0].'.'.$ip[1] == '213.251' ) {
                        PHP_FIREWALL_LOGS( 'OVH Server IP' );
                        die( _PHPF_PROTECTION_OVH );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_KIMSUFI === true ) {
                    if ( stristr( PHP_FIREWALL_GET_HOST ,'kimsufi') ) {
                        PHP_FIREWALL_LOGS( 'KIMSUFI Server list' );
                        die( _PHPF_PROTECTION_KIMSUFI );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_DEDIBOX === true ) {
                    if ( stristr( PHP_FIREWALL_GET_HOST ,'dedibox') ) {
                        PHP_FIREWALL_LOGS( 'DEDIBOX Server list' );
                        die( _PHPF_PROTECTION_DEDIBOX );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_DEDIBOX_BY_IP === true ) {
                    $ip = explode('.', PHP_FIREWALL_GET_IP );
                    if ( $ip[0].'.'.$ip[1] == '88.191' ) {
                        PHP_FIREWALL_LOGS( 'DEDIBOX Server IP' );
                        die( _PHPF_PROTECTION_DEDIBOX_IP );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_DIGICUBE === true ) {
                    if ( stristr( PHP_FIREWALL_GET_HOST ,'digicube') ) {
                        PHP_FIREWALL_LOGS( 'DIGICUBE Server list' );
                        die( _PHPF_PROTECTION_DIGICUBE );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_SERVER_DIGICUBE_BY_IP === true ) {
                    $ip = explode('.', PHP_FIREWALL_GET_IP );
                    if ( $ip[0].'.'.$ip[1] == '95.130' ) {
                        PHP_FIREWALL_LOGS( 'DIGICUBE Server IP' );
                        die( _PHPF_PROTECTION_DIGICUBE_IP );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_RANGE_IP_SPAM === true ) {
                    $ip_array = array('24', '186', '189', '190', '200', '201', '202', '209', '212', '213', '217', '222' );
                    $range_ip = explode('.', PHP_FIREWALL_GET_IP );
                    if ( in_array( $range_ip[0], $ip_array ) ) {
                        PHP_FIREWALL_LOGS( 'IPs Spam list' );
                        die( _PHPF_PROTECTION_SPAM );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_RANGE_IP_DENY === true ) {
                    $ip_array = array('0', '1', '2', '5', '10', '14', '23', '27', '31', '36', '37', '39', '42', '46', '49', '50', '100', '101', '102', '103', '104', '105', '106', '107', '114', '172', '176', '177', '179', '181', '185', '192', '223', '224' );
                    $range_ip = explode('.', PHP_FIREWALL_GET_IP );
                    if ( in_array( $range_ip[0], $ip_array ) ) {
                        PHP_FIREWALL_LOGS( 'IPs reserved list' );
                        die( _PHPF_PROTECTION_SPAM_IP );
                    }
                }
    
                if ( PHP_FIREWALL_PROTECTION_COOKIES === true ) {
                    $ct_rules = Array('applet', 'base', 'bgsound', 'blink', 'embed', 'expression', 'frame', 'javascript', 'layer', 'link', 'meta', 'object', 'onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload', 'script', 'style', 'title', 'vbscript', 'xml');
                    if ( PHP_FIREWALL_PROTECTION_COOKIES === true ) {
                        foreach($_COOKIE as $value) {
                            $check = str_replace($ct_rules, '*', $value);
                            if( $value != $check ) {
                                PHP_FIREWALL_LOGS( 'Cookie protect' );
                                unset( $value );
                            }
                        }
                    }
                    if ( PHP_FIREWALL_PROTECTION_POST === true ) {
                        foreach( $_POST as $value ) {
                            $check = str_replace($ct_rules, '*', $value);
                            if( $value != $check ) {
                                PHP_FIREWALL_LOGS( 'POST protect' );
                                unset( $value );
                            }
                        }
                    }
                    if ( PHP_FIREWALL_PROTECTION_GET === true ) {
                        foreach( $_GET as $value ) {
                            $check = str_replace($ct_rules, '*', $value);
                            if( $value != $check ) {
                                PHP_FIREWALL_LOGS( 'GET protect' );
                                unset( $value );
                            }
                        }
                    }
                }
    
                /** protection de l'url */
                if ( PHP_FIREWALL_PROTECTION_URL === true ) {
                    $ct_rules = array( 'absolute_path', 'ad_click', 'alert(', 'alert%20', ' and ', 'basepath', 'bash_history', '.bash_history', 'cgi-', 'chmod(', 'chmod%20', '%20chmod', 'chmod=', 'chown%20', 'chgrp%20', 'chown(', '/chown', 'chgrp(', 'chr(', 'chr=', 'chr%20', '%20chr', 'chunked', 'cookie=', 'cmd', 'cmd=', '%20cmd', 'cmd%20', '.conf', 'configdir', 'config.php', 'cp%20', '%20cp', 'cp(', 'diff%20', 'dat?', 'db_mysql.inc', 'document.location', 'document.cookie', 'drop%20', 'echr(', '%20echr', 'echr%20', 'echr=', '}else{', '.eml', 'esystem(', 'esystem%20', '.exe',  'exploit', 'file\://', 'fopen', 'fwrite', '~ftp', 'ftp:', 'ftp.exe', 'getenv', '%20getenv', 'getenv%20', 'getenv(', 'grep%20', '_global', 'global_', 'global[', 'http:', '_globals', 'globals_', 'globals[', 'grep(', 'g\+\+', 'halt%20', '.history', '?hl=', '.htpasswd', 'http_', 'http-equiv', 'http/1.', 'http_php', 'http_user_agent', 'http_host', '&icq', 'if{', 'if%20{', 'img src', 'img%20src', '.inc.php', '.inc', 'insert%20into', 'ISO-8859-1', 'ISO-', 'javascript\://', '.jsp', '.js', 'kill%20', 'kill(', 'killall', '%20like', 'like%20', 'locate%20', 'locate(', 'lsof%20', 'mdir%20', '%20mdir', 'mdir(', 'mcd%20', 'motd%20', 'mrd%20', 'rm%20', '%20mcd', '%20mrd', 'mcd(', 'mrd(', 'mcd=', 'mod_gzip_status', 'modules/', 'mrd=', 'mv%20', 'nc.exe', 'new_password', 'nigga(', '%20nigga', 'nigga%20', '~nobody', 'org.apache', '+outfile+', '%20outfile%20', '*/outfile/*',' outfile ','outfile', 'password=', 'passwd%20', '%20passwd', 'passwd(', 'phpadmin', 'perl%20', '/perl', 'phpbb_root_path','*/phpbb_root_path/*','p0hh', 'ping%20', '.pl', 'powerdown%20', 'rm(', '%20rm', 'rmdir%20', 'mv(', 'rmdir(', 'phpinfo()', '<?php', 'reboot%20', '/robot.txt' , '~root', 'root_path', 'rush=', '%20and%20', '%20xorg%20', '%20rush', 'rush%20', 'secure_site, ok', 'select%20', 'select from', 'select%20from', '_server', 'server_', 'server[', 'server-info', 'server-status', 'servlet', 'sql=', '<script', '<script>', '</script','script>','/script', 'switch{','switch%20{', '.system', 'system(', 'telnet%20', 'traceroute%20', '.txt', 'union%20', '%20union', 'union(', 'union=', 'vi(', 'vi%20', 'wget', 'wget%20', '%20wget', 'wget(', 'window.open', 'wwwacl', ' xor ', 'xp_enumdsn', 'xp_availablemedia', 'xp_filelist', 'xp_cmdshell', '$_request', '$_get', '$request', '$get',  '&aim', '/etc/password','/etc/shadow', '/etc/groups', '/etc/gshadow', '/bin/ps', 'uname\x20-a', '/usr/bin/id', '/bin/echo', '/bin/kill', '/bin/', '/chgrp', '/usr/bin', 'bin/python', 'bin/tclsh', 'bin/nasm', '/usr/x11r6/bin/xterm', '/bin/mail', '/etc/passwd', '/home/ftp', '/home/www', '/servlet/con', '?>', '.txt');
                    $check = str_replace($ct_rules, '*', PHP_FIREWALL_GET_QUERY_STRING );
                    if( PHP_FIREWALL_GET_QUERY_STRING != $check ) {
                        PHP_FIREWALL_LOGS( 'URL protect' );
                        die( _PHPF_PROTECTION_URL );
                    }
                }
    
                /** Posting from other servers in not allowed */
                if ( PHP_FIREWALL_PROTECTION_REQUEST_SERVER === true ) {
                    if ( PHP_FIREWALL_GET_REQUEST_METHOD == 'POST' ) {
                        if (isset($_SERVER['HTTP_REFERER'])) {
                            if ( ! stripos( $_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], 0 ) ) {
                                PHP_FIREWALL_LOGS( 'Posting another server' );
                                die( _PHPF_PROTECTION_OTHER_SERVER );
                            }
                        }
                    }
                }
    
                /** protection contre le vers santy */
                if ( PHP_FIREWALL_PROTECTION_SANTY === true ) {
                    $ct_rules = array('rush','highlight=%','perl','chr(','pillar','visualcoder','sess_');
                    $check = str_replace($ct_rules, '*', strtolower(PHP_FIREWALL_REQUEST_URI) );
                    if( strtolower(PHP_FIREWALL_REQUEST_URI) != $check ) {
                        PHP_FIREWALL_LOGS( 'Santy' );
                        die( _PHPF_PROTECTION_SANTY );
                    }
                }
    
                /** protection bots */
                if ( PHP_FIREWALL_PROTECTION_BOTS === true ) {
                    $ct_rules = array( '@nonymouse', 'addresses.com', 'ideography.co.uk', 'adsarobot', 'ah-ha', 'aktuelles', 'alexibot', 'almaden', 'amzn_assoc', 'anarchie', 'art-online', 'aspseek', 'assort', 'asterias', 'attach', 'atomz', 'atspider', 'autoemailspider', 'backweb', 'backdoorbot', 'bandit', 'batchftp', 'bdfetch', 'big.brother', 'black.hole', 'blackwidow', 'blowfish', 'bmclient', 'boston project', 'botalot', 'bravobrian', 'buddy', 'bullseye', 'bumblebee ', 'builtbottough', 'bunnyslippers', 'capture', 'cegbfeieh', 'cherrypicker', 'cheesebot', 'chinaclaw', 'cicc', 'civa', 'clipping', 'collage', 'collector', 'copyrightcheck', 'cosmos', 'crescent', 'custo', 'cyberalert', 'deweb', 'diagem', 'digger', 'digimarc', 'diibot', 'directupdate', 'disco', 'dittospyder', 'download accelerator', 'download demon', 'download wonder', 'downloader', 'drip', 'dsurf', 'dts agent', 'dts.agent', 'easydl', 'ecatch', 'echo extense', 'efp@gmx.net', 'eirgrabber', 'elitesys', 'emailsiphon', 'emailwolf', 'envidiosos', 'erocrawler', 'esirover', 'express webpictures', 'extrac', 'eyenetie', 'fastlwspider', 'favorg', 'favorites sweeper', 'fezhead', 'filehound', 'filepack.superbr.org', 'flashget', 'flickbot', 'fluffy', 'frontpage', 'foobot', 'galaxyBot', 'generic', 'getbot ', 'getleft', 'getright', 'getsmart', 'geturl', 'getweb', 'gigabaz', 'girafabot', 'go-ahead-got-it', 'go!zilla', 'gornker', 'grabber', 'grabnet', 'grafula', 'green research', 'harvest', 'havindex', 'hhjhj@yahoo', 'hloader', 'hmview', 'homepagesearch', 'htmlparser', 'hulud', 'http agent', 'httpconnect', 'httpdown', 'http generic', 'httplib', 'httrack', 'humanlinks', 'ia_archiver', 'iaea', 'ibm_planetwide', 'image stripper', 'image sucker', 'imagefetch', 'incywincy', 'indy', 'infonavirobot', 'informant', 'interget', 'internet explore', 'infospiders',  'internet ninja', 'internetlinkagent', 'interneteseer.com', 'ipiumbot', 'iria', 'irvine', 'jbh', 'jeeves', 'jennybot', 'jetcar', 'joc web spider', 'jpeg hunt', 'justview', 'kapere', 'kdd explorer', 'kenjin.spider', 'keyword.density', 'kwebget', 'lachesis', 'larbin',  'laurion(dot)com', 'leechftp', 'lexibot', 'lftp', 'libweb', 'links aromatized', 'linkscan', 'link*sleuth', 'linkwalker', 'libwww', 'lightningdownload', 'likse', 'lwp','mac finder', 'mag-net', 'magnet', 'marcopolo', 'mass', 'mata.hari', 'mcspider', 'memoweb', 'microsoft url control', 'microsoft.url', 'midown', 'miixpc', 'minibot', 'mirror', 'missigua', 'mister.pix', 'mmmtocrawl', 'moget', 'mozilla/2', 'mozilla/3.mozilla/2.01', 'mozilla.*newt', 'multithreaddb', 'munky', 'msproxy', 'nationaldirectory', 'naverrobot', 'navroad', 'nearsite', 'netants', 'netcarta', 'netcraft', 'netfactual', 'netmechanic', 'netprospector', 'netresearchserver', 'netspider', 'net vampire', 'newt', 'netzip', 'nicerspro', 'npbot', 'octopus', 'offline.explorer', 'offline explorer', 'offline navigator', 'opaL', 'openfind', 'opentextsitecrawler', 'orangebot', 'packrat', 'papa foto', 'pagegrabber', 'pavuk', 'pbwf', 'pcbrowser', 'personapilot', 'pingalink', 'pockey', 'program shareware', 'propowerbot/2.14', 'prowebwalker', 'proxy', 'psbot', 'psurf', 'puf', 'pushsite', 'pump', 'qrva', 'quepasacreep', 'queryn.metasearch', 'realdownload', 'reaper', 'recorder', 'reget', 'replacer', 'repomonkey', 'rma', 'robozilla', 'rover', 'rpt-httpclient', 'rsync', 'rush=', 'searchexpress', 'searchhippo', 'searchterms.it', 'second street research', 'seeker', 'shai', 'sitecheck', 'sitemapper', 'sitesnagger', 'slysearch', 'smartdownload', 'snagger', 'spacebison', 'spankbot', 'spanner', 'spegla', 'spiderbot', 'spiderengine', 'sqworm', 'ssearcher100', 'star downloader', 'stripper', 'sucker', 'superbot', 'surfwalker', 'superhttp', 'surfbot', 'surveybot', 'suzuran', 'sweeper', 'szukacz/1.4', 'tarspider', 'takeout', 'teleport', 'telesoft', 'templeton', 'the.intraformant', 'thenomad', 'tighttwatbot', 'titan', 'tocrawl/urldispatcher','toolpak', 'traffixer', 'true_robot', 'turingos', 'turnitinbot', 'tv33_mercator', 'uiowacrawler', 'urldispatcherlll', 'url_spider_pro', 'urly.warning ', 'utilmind', 'vacuum', 'vagabondo', 'vayala', 'vci', 'visualcoders', 'visibilitygap', 'vobsub', 'voideye', 'vspider', 'w3mir', 'webauto', 'webbandit', 'web.by.mail', 'webcapture', 'webcatcher', 'webclipping', 'webcollage', 'webcopier', 'webcopy', 'webcraft@bea', 'web data extractor', 'webdav', 'webdevil', 'webdownloader', 'webdup', 'webenhancer', 'webfetch', 'webgo', 'webhook', 'web.image.collector', 'web image collector', 'webinator', 'webleacher', 'webmasters', 'webmasterworldforumbot', 'webminer', 'webmirror', 'webmole', 'webreaper', 'websauger', 'websaver', 'website.quester', 'website quester', 'websnake', 'websucker', 'web sucker', 'webster', 'webreaper', 'webstripper', 'webvac', 'webwalk', 'webweasel', 'webzip', 'wget', 'widow', 'wisebot', 'whizbang', 'whostalking', 'wonder', 'wumpus', 'wweb', 'www-collector-e', 'wwwoffle', 'wysigot', 'xaldon', 'xenu', 'xget', 'x-tractor', 'zeus' );
                    $check = str_replace($ct_rules, '*', strtolower(PHP_FIREWALL_USER_AGENT) );
                    if( strtolower(PHP_FIREWALL_USER_AGENT) != $check ) {
                        PHP_FIREWALL_LOGS( 'Bots attack' );
                        die( _PHPF_PROTECTION_BOTS );
                    }
                }
    
                /** Invalid request method check */
                if ( PHP_FIREWALL_PROTECTION_REQUEST_METHOD === true ) {
                    if(strtolower(PHP_FIREWALL_GET_REQUEST_METHOD)!='get' AND strtolower(PHP_FIREWALL_GET_REQUEST_METHOD)!='head' AND strtolower(PHP_FIREWALL_GET_REQUEST_METHOD)!='post' AND strtolower(PHP_FIREWALL_GET_REQUEST_METHOD)!='put') {
                        PHP_FIREWALL_LOGS( 'Invalid request' );
                        die( _PHPF_PROTECTION_REQUEST );
                    }
                }
    
                /** protection dos attaque */
                if ( PHP_FIREWALL_PROTECTION_DOS === true ) {
                    if ( !defined('PHP_FIREWALL_USER_AGENT')  || PHP_FIREWALL_USER_AGENT == '-' ) {
                        PHP_FIREWALL_LOGS( 'Dos attack' );
                        die( _PHPF_PROTECTION_DOS );
                    }
                }
    
                /** protection union sql attaque */
                if ( PHP_FIREWALL_PROTECTION_UNION_SQL === true ) {
                    $stop = 0;
                    $ct_rules = array( '*/from/*', '*/insert/*', '+into+', '%20into%20', '*/into/*', ' into ', 'into', '*/limit/*', 'not123exists*', '*/radminsuper/*', '*/select/*', '+select+', '%20select%20', ' select ',  '+union+', '%20union%20', '*/union/*', ' union ', '*/update/*', '*/where/*' );
                    $check    = str_replace($ct_rules, '*', PHP_FIREWALL_GET_QUERY_STRING );
                    if( PHP_FIREWALL_GET_QUERY_STRING != $check ) $stop++;
                    if (preg_match(PHP_FIREWALL_REGEX_UNION, PHP_FIREWALL_GET_QUERY_STRING)) $stop++;
                    if (preg_match('/([OdWo5NIbpuU4V2iJT0n]{5}) /', rawurldecode( PHP_FIREWALL_GET_QUERY_STRING ))) $stop++;
                    if (strstr(rawurldecode( PHP_FIREWALL_GET_QUERY_STRING ) ,'*')) $stop++;
                    if ( !empty( $stop ) ) {
                        PHP_FIREWALL_LOGS( 'Union attack' );
                        die( _PHPF_PROTECTION_UNION );
                    }
                }
    
                /** protection click attack */
                if ( PHP_FIREWALL_PROTECTION_CLICK_ATTACK === true ) {
                    $ct_rules = array( '/*', 'c2nyaxb0', '/*' );
                    if( PHP_FIREWALL_GET_QUERY_STRING != str_replace($ct_rules, '*', PHP_FIREWALL_GET_QUERY_STRING ) ) {
                        PHP_FIREWALL_LOGS( 'Click attack' );
                        die( _PHPF_PROTECTION_CLICK );
                    }
                }
    
                /** protection XSS attack */
                if ( PHP_FIREWALL_PROTECTION_XSS_ATTACK === true ) {
                    $ct_rules = array( 'http\:\/\/', 'https\:\/\/', 'cmd=', '&cmd', 'exec', 'concat', './', '../',  'http:', 'h%20ttp:', 'ht%20tp:', 'htt%20p:', 'http%20:', 'https:', 'h%20ttps:', 'ht%20tps:', 'htt%20ps:', 'http%20s:', 'https%20:', 'ftp:', 'f%20tp:', 'ft%20p:', 'ftp%20:', 'ftps:', 'f%20tps:', 'ft%20ps:', 'ftp%20s:', 'ftps%20:', '.php?url=' );
                    $check    = str_replace($ct_rules, '*', PHP_FIREWALL_GET_QUERY_STRING );
                    if( PHP_FIREWALL_GET_QUERY_STRING != $check ) {
                        PHP_FIREWALL_LOGS( 'XSS attack' );
                        die( _PHPF_PROTECTION_XSS );
                    }
                }
    
            }