Web security to prevent sql injection is multi-filtering with PHP filtering function-PHP Tutorial-php.cn

Web security to prevent sql injection is multi-filtering with PHP filtering function

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Release： 2023-03-25 11:06:01

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这篇文章主要介绍了关于web安全防sql注入就是多过滤附PHP过滤函数，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

SQL注入与跨站攻击过滤函数，支持SQL注入，跨站脚本攻击和跨站POST提交等常见安全过滤。

<?php    
     /**    
      * 全局安全过滤函数    
      * 支持SQL注入和跨站脚本攻击    
      */    
     function global_filter()    
     {    
     //APP，ACT 分别为控制器和控制器方法    
     $params = array(APP, ACT);    
     foreach($params as $k => $v)    
     {    
     if(!preg_match("/^[a-zA-Z0-9_-]+$/", $v))    
     {    
                 header_status_404();    
     }    
     }    
     
     $arrStr = array(&#39;%0d%0a&#39;, "&#39;", &#39;<&#39;, &#39;>&#39;, &#39;$&#39;, &#39;script&#39;, &#39;document&#39;, &#39;eval&#39;,&#39;atestu&#39;,&#39;select&#39;,&#39;insert?into&#39;,&#39;delete?from&#39;);    
     global_inject_input($_SERVER[&#39;HTTP_REFERER&#39;], $arrStr, true);    
     global_inject_input($_SERVER[&#39;HTTP_USER_AGENT&#39;], $arrStr, true);    
     global_inject_input($_SERVER[&#39;HTTP_ACCEPT_LANGUAGE&#39;], $arrStr, true);    
     global_inject_input($_GET, array_merge($arrStr, array(&#39;"&#39;)), true);    
     //global_inject_input($_COOKIE, array_merge($arrStr, array(&#39;"&#39;, &#39;&&#39;)), true);    
         //cookie会有对url的记录(pGClX_last_url)。去掉对&的判断    
         global_inject_input($_COOKIE, array_merge($arrStr, array(&#39;"&#39;)), true);    
     global_inject_input($_SERVER, array(&#39;%0d%0a&#39;), true);    
     
     //处理跨域POST提交问题    
     if($_SERVER[&#39;REQUEST_METHOD&#39;] == &#39;POST&#39;)    
     {    
     //处理客户端POST请求处理没有HTTP_REFERER参数问题    
     if(isset($_SERVER[&#39;HTTP_REFERER&#39;]))    
     {    
     $url = parse_url($_SERVER[&#39;HTTP_REFERER&#39;]);    
     $referer_host = !empty($url[&#39;port&#39;]) && $url[&#39;port&#39;] != &#39;80&#39; ? $url[&#39;host&#39;].&#39;:&#39;.$url[&#39;port&#39;] : $url[&#39;host&#39;];    
     if($referer_host != $_SERVER[&#39;HTTP_HOST&#39;])    
     {    
        header_status_404();    
     }    
     }    
     }    
     
     global_inject_input($_POST, array(&#39;%0d%0a&#39;));    
     global_inject_input($_REQUEST, array(&#39;%0d%0a&#39;));    
     }    
     
     /**    
      * 全局安全过滤函数    
      */    
     function global_inject_input($string, $inject_string, $replace = false)    
     {    
     if(!is_array($string))    
     {    
     foreach($inject_string as $value)    
     {    
     if(stripos(strtolower($string), $value) !== false)    
     {    
                     header_status_404();    
     }    
     }    
     if($replace)    
     {    
     return filter_var(safe_replace($string),FILTER_SANITIZE_STRING);    
     }    
     else    
     {    
        return $string;    
     }    
     }    
     
     foreach($string as $key => $val)    
     {    
     $string[$key] = global_inject_input($val, $inject_string, $replace);    
     }    
     
     return $string;    
     }    
     
     /**    
      * http 头信息    
     **/    
     function header_status_404($status = &#39;404&#39;)    
     {    
        if(substr(php_sapi_name(), 0, 3) == &#39;cgi&#39;)    
     {    
        header(&#39;Status: &#39;.$status, TRUE);    
        exit;    
     }    
        else    
        {    
     header($_SERVER[&#39;SERVER_PROTOCOL&#39;].&#39; &#39;.$status);    
     $error_404 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n";    
     $error_404 .= "<html><head>\r\n";    
     $error_404 .= "<title>404 Not Found</title>\r\n";    
     $error_404 .= "</head><body>\r\n";    
     $error_404 .= "<h1>Object not found!</h1>\r\n";    
     $error_404 .= "<p>The requested URL was not found on this server!~</p>\r\n";    
     $error_404 .= "<h2>Error 404</h2></body></html>";    
     echo $error_404;    
     exit;    
     }    
     }    
     
     /**    
      * 安全过滤函数    
      *    
      * @param $string    
      * @return string    
      */    
     function safe_replace($string)    
     {    
     $string = str_replace(&#39;%20&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;%27&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;%2527&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;*&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;"&#39;, &#39;&quot;&#39;, $string);    
     $string = str_replace("&#39;", &#39;&#39;, $string);    
     $string = str_replace(&#39;"&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;;&#39;, &#39;&#39;, $string);    
     $string = str_replace(&#39;<&#39;, &#39;&lt;&#39;, $string);    
     $string = str_replace(&#39;>&#39;, &#39;&gt;&#39;, $string);    
     $string = str_replace("{", &#39;&#39;, $string);    
     $string = str_replace(&#39;}&#39;, &#39;&#39;, $string);    
     return $string;    
     }

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