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HomeBackend DevelopmentPHP Tutorial 刚刚说到XSS攻击.

刚刚说到XSS攻击.

Jun 13, 2016 pm 01:18 PM
arrayhtmlspecialcharsquotreturn

刚说到XSS攻击..
我记得我之前做一个项目.就给检测出存在XSS攻击。

开始我没有过滤提交的内容。

后来foreach 循环过滤每一个变量$_GET...$_POST...,发现不行。

然后只好写了个函数 直接检测 $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"] 判断直接 exit...

不知道大家都是怎么处理这个问题的...


------解决方案--------------------
htmlspecialchars过滤
------解决方案--------------------
htmlspecialchars
------解决方案--------------------

探讨
怎么过滤 过滤 $_GET所有变量 ? 这样没用...我试过了.


引用:

htmlspecialchars过滤

------解决方案--------------------
PHP code
<?php $array = array("hello"=>"dsa");
foreach($array as &$value){     
$value = htmlspecialchars($value);
}
var_dump($array);
array(1) {
  ["hello"]=>
  &string(11) "dsa<>"
}
<br><font color="#e78608">------解决方案--------------------</font><br>
探讨

你用
foreach($_GET as &$value){
$value=htmlspecialchars($value);}

这样来过滤?



引用:

引用:
怎么过滤 过滤 $_GET所有变量 ? 这样没用...我试过了.


引用:

htmlspecialchars过滤


没用是什……

------解决方案--------------------
给你这三个函数,你根据需求稍加修改就好了,以后要获取内容的时候不管是get还是post传值都用这样的方法来获取:
$变量名=Toget('参数名或表单内的项目名');

PHP code

//函数:获取数据
//参数:表单名,是否需要转译
Function Toget($__k,$Slash=True){
    IF($__k==""){Return False;}

    IF(Array_key_exists($__k,$_REQUEST)){
        $Value=IsSet($_POST["".$__k.""])?$_POST["".$__k.""]:$_GET["".$__k.""];
    }Else{
        Return False;
    }

    IF(Is_array($Value)){
        $Value=Array_Filter($Value,'_nul');
    }Else{
        $Value=Trim($Value);
        IF($Value==""){Return False;}
    }

    IF($Slash){
        $Value=Addlash($Value);
    }

    //反馈结果
    IF(Is_array($Value)){Return $Value;}
    IF($Value=="" Or !Isset($Value)){
        Return False;
    }Else{
        Return $Value;
    }
}
function Addlash($Str){
    !Defined('MAGIC_QUOTES_GPC') && Define('MAGIC_QUOTES_GPC',get_magic_quotes_gpc());
    IF(!MAGIC_QUOTES_GPC){
        IF(Is_array($Str)){
            $keys=array_keys($Str);
            Foreach($keys as $key){
                $val=$Str[$key];unset($Str[$key]);
                $Str[addslashes($key)]=Addlash($val);
            }
        }Else{
            $Str=addslashes($Str);
        }
    }
    Return $Str;
}

//清理数组中的空值
//用法:Print_r (Array_Filter($Arr,'_nul'));
Function _nul($param){
    Return ($param!="") ? True : False;
}
<br><font color="#e78608">------解决方案--------------------</font><br>这个得mark一下,继续~
<br><font color="#e78608">------解决方案--------------------</font><br>
XSS又叫CSS (Cross Site Script) ,跨站脚本攻击。它指的是恶意攻击者往Web页面里插入恶意脚本代码,当用户浏览该页之时,嵌入其中Web里面的脚本代码会被执行,从而达到恶意攻击用户的特殊目的。XSS属于被动式的攻击,因为其被动且不好利用,所以许多人常忽略其危害性。<br><br>服务器端脚本防止 XSS 的唯一手段是检查传入的数据中是否有 script 标记<br>当然,攻击者还有 n 多的手段去直接在你的页面中嵌入恶意代码。这就不是服务器端脚本能解决的问题了<br>简单的用 htmlspecialchars 处理一下,只适合于其后只将传入的数据作为字符串显示的场合。<br>由于 <script xss></script><br>对于 #7 的 <img  src alt=" 刚刚说到XSS攻击. " >显然使用的检测算法不是最大匹配算法,而是简单的包含算法<br>虽无大错,但误判率升高。宁可错杀三千,不可放过一个<br><br><br><br>
<br><font color="#e78608">------解决方案--------------------</font><br>
探讨

引用:

你用
foreach($_GET as &$value){
$value=htmlspecialchars($value);}

这样来过滤?
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