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HomeBackend DevelopmentPHP Tutorialphp跨站攻击实例分析_PHP

本文实例讲述了php跨站攻击的原理与防范技巧。分享给大家供大家参考。具体方法分析如下:

跨站攻击就是利用程序上的一些细节或bug问题进行的,那么我们要如何耿防止跨站攻击呢?下面就以一个防止跨站攻击例子来说明,希望对各位有帮助。

代码如下:

#demo for prevent csrf
/**
* enc
*/
function encrypt($token_time) {
return md5('!@##$@$$#%43' . $token_time);
}
$token_time = time();
$token = encrypt($token_time);
$expire_time = 10;
if ($_POST) {
$_token_time = $_POST['token_time'];
$_token = $_POST['token'];
if ((time() – $_token_time) > $expire_time) {
echo “expired token”;
echo “
”;
}
echo $_token;
echo “
”;
$_token_real = encrypt($_token_time);
echo $_token_real;
//compare $_token and $_token_real
}
?>




test for csrf





” />
” />




 
通过在你的表单中包括验证码,你事实上已经消除了跨站请求伪造攻击的风险。可以在任何需要执行操作的任何表单中使用这个流程
当然,将token 存储到session更好,这里只是简单示例下

简单分析:

token防攻击也叫作令牌,我们在用户访问页面时就生成了一个随机的token保存session与表单了,用户提交时如果我们获取到的token与session不一样就可以提交重新输入提交数据了

希望本文所述对大家的php程序设计有所帮助。

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