2012-08-22 16:04:25 +08:00
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<?php
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/**
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* 全局安全过滤函数
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* 支持SQL注入和跨站脚本攻击
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*/
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function global_filter()
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{
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//APP，ACT 分别为控制器和控制器方法
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$params = array(APP, ACT);
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foreach($params as $k => $v)
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{
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if(!preg_match("/^[a-zA-Z0-9_-]+$/", $v))
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{
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header_status_404();
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}
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}
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$arrStr = array('%0d%0a', "'", '<', '>', '$', 'script', 'document', 'eval','atestu','select','insert?into','delete?from');
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global_inject_input($_SERVER['HTTP_REFERER'], $arrStr, true);
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global_inject_input($_SERVER['HTTP_USER_AGENT'], $arrStr, true);
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global_inject_input($_SERVER['HTTP_ACCEPT_LANGUAGE'], $arrStr, true);
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global_inject_input($_GET, array_merge($arrStr, array('"')), true);
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//global_inject_input($_COOKIE, array_merge($arrStr, array('"', '&')), true);
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//cookie会有对url的记录(pGClX_last_url)。去掉对&的判断
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global_inject_input($_COOKIE, array_merge($arrStr, array('"')), true);
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global_inject_input($_SERVER, array('%0d%0a'), true);
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//处理跨域POST提交问题
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if($_SERVER['REQUEST_METHOD'] == 'POST')
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{
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2012-10-30 15:37:36 +08:00
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//处理客户端POST请求处理没有HTTP_REFERER参数问题
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if(isset($_SERVER['HTTP_REFERER']))
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2012-08-22 16:04:25 +08:00
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{
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2012-10-30 15:37:36 +08:00
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$url = parse_url($_SERVER['HTTP_REFERER']);
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$referer_host = !empty($url['port']) && $url['port'] != '80' ? $url['host'].':'.$url['port'] : $url['host'];
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if($referer_host != $_SERVER['HTTP_HOST'])
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{
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header_status_404();
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}
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2012-08-22 16:04:25 +08:00
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}
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}
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global_inject_input($_POST, array('%0d%0a'));
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global_inject_input($_REQUEST, array('%0d%0a'));
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}
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/**
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* 全局安全过滤函数
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*/
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function global_inject_input($string, $inject_string, $replace = false)
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{
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if(!is_array($string))
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{
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foreach($inject_string as $value)
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{
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if(stripos(strtolower($string), $value) !== false)
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{
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header_status_404();
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}
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}
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if($replace)
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{
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return filter_var(safe_replace($string),FILTER_SANITIZE_STRING);
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}
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else
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{
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return $string;
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}
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}
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foreach($string as $key => $val)
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{
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$string[$key] = global_inject_input($val, $inject_string, $replace);
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}
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return $string;
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}
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/**
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* http 头信息
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**/
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function header_status_404($status = '404')
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{
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if(substr(php_sapi_name(), 0, 3) == 'cgi')
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{
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header('Status: '.$status, TRUE);
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exit;
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}
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else
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{
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header($_SERVER['SERVER_PROTOCOL'].' '.$status);
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$error_404 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n";
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$error_404 .= "<html><head>\r\n";
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$error_404 .= "<title>404 Not Found</title>\r\n";
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$error_404 .= "</head><body>\r\n";
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$error_404 .= "<h1>Object not found!</h1>\r\n";
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$error_404 .= "<p>The requested URL was not found on this server!~</p>\r\n";
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$error_404 .= "<h2>Error 404</h2></body></html>";
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echo $error_404;
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exit;
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}
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}
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/**
|
|
|
|
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* 安全过滤函数
|
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*
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* @param $string
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* @return string
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*/
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function safe_replace($string)
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{
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$string = str_replace('%20', '', $string);
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$string = str_replace('%27', '', $string);
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$string = str_replace('%2527', '', $string);
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$string = str_replace('*', '', $string);
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$string = str_replace('"', '"', $string);
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$string = str_replace("'", '', $string);
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$string = str_replace('"', '', $string);
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$string = str_replace(';', '', $string);
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$string = str_replace('<', '<', $string);
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$string = str_replace('>', '>', $string);
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$string = str_replace("{", '', $string);
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$string = str_replace('}', '', $string);
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return $string;
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}
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