可以有效防护XSS，sql注射，代码执行，文件包含等多种高危漏洞。

http://bbs.aliyun.com/read/137391.html

<?php

/**
*   云体检通用漏洞防护补丁v1.1
*   更新时间：2013-05-25
*   功能说明：防护XSS,SQL,代码执行，文件包含等多种高危漏洞
*/

$url_arr = array(
    'xss' => "\\=\\+\\/v(?:8|9|\\+|\\/)|\\%0acontent\\-(?:id|location|type|transfer\\-encoding)",
);

$args_arr = array(
    'xss' => "[\\'\\\"\\;\\*\\<\\>].*\\bon[a-zA-Z]{3,15}[\\s\\r\\n\\v\\f]*\\=|\\b(?:expression)\\(|\\<script[\\s\\\\\\/]|\\<\\!\\[cdata\\[|\\b(?:eval|alert|prompt|msgbox)\\s*\\(|url\\((?:\\#|data|javascript)",

    'sql' => "[^\\{\\s]{1}(\\s|\\b)+(?:select\\b|update\\b|insert(?:(\\/\\*.*?\\*\\/)|(\\s)|(\\+))+into\\b).+?(?:from\\b|set\\b)|[^\\{\\s]{1}(\\s|\\b)+(?:create|delete|drop|truncate|rename|desc)(?:(\\/\\*.*?\\*\\/)|(\\s)|(\\+))+(?:table\\b|from\\b|database\\b)|into(?:(\\/\\*.*?\\*\\/)|\\s|\\+)+(?:dump|out)file\\b|\\bsleep\\([\\s]*[\\d]+[\\s]*\\)|benchmark\\(([^\\,]*)\\,([^\\,]*)\\)|(?:declare|set|select)\\b.*@|union\\b.*(?:select|all)\\b|(?:select|update|insert|create|delete|drop|grant|truncate|rename|exec|desc|from|table|database|set|where)\\b.*(charset|ascii|bin|char|uncompress|concat|concat_ws|conv|export_set|hex|instr|left|load_file|locate|mid|sub|substring|oct|reverse|right|unhex)\\(|(?:master\\.\\.sysdatabases|msysaccessobjects|msysqueries|sysmodules|mysql\\.db|sys\\.database_name|information_schema\\.|sysobjects|sp_makewebtask|xp_cmdshell|sp_oamethod|sp_addextendedproc|sp_oacreate|xp_regread|sys\\.dbms_export_extension)",

    'other' => "\\.\\.[\\\\\\/].*\\%00([^0-9a-fA-F]|$)|%00[\\'\\\"\\.]"
);

$referer = empty($_SERVER['HTTP_REFERER']) ? array() : array($_SERVER['HTTP_REFERER']);

$query_string = empty($_SERVER["QUERY_STRING"]) ? array() : array($_SERVER["QUERY_STRING"]);

check_data( $query_string , $url_arr );
check_data( $_GET , $args_arr );
check_data( $_POST , $args_arr );

check_data( $_COOKIE , $args_arr );
check_data( $referer , $args_arr );

function W_log($log){

    $logpath = $_SERVER["DOCUMENT_ROOT"]."/log.txt";
    $log_f = fopen($logpath,"a+");
    fputs($log_f,$log."\r\n");
    fclose($log_f);

}

function check_data($arr,$v) {
    foreach($arr as $key=>$value){
        if(!is_array($key)){
            check($key,$v);
        }else{
            check_data($key,$v);
        }

        if( !is_array($value) ){
            check($value,$v);
        }else{
            check_data($value,$v);
        }
    }
}

function check($str,$v){
    foreach($v as $key=>$value){
        if ( preg_match("/".$value."/is",$str) == 1 ||
            preg_match("/".$value."/is",urlencode($str) ) ==1 ){
            //W_log("<br>IP: ".$_SERVER["REMOTE_ADDR"]."<br>时间: ".strftime("%Y-%m-%d %H:%M:%S")."<br>页面:".$_SERVER["PHP_SELF"]."<br>提交方式: ".$_SERVER["REQUEST_METHOD"]."<br>提交数据: ".$str);
            print "您的提交带有不合法参数,谢谢合作";
            exit();
        }
    }
}

?>