ctf-安慰奖
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<?php
header("Content-Type: text/html;charset=utf-8");
error_reporting(0);
echo "<!-- YmFja3Vwcw== -->";
class ctf
{
protected $username = 'hack';
protected $cmd = 'NULL';
public function __construct($username,$cmd)
{
$this->username = $username;
$this->cmd = $cmd;
}
function __wakeup()
{
$this->username = 'guest';
}
function __destruct()
{
if(preg_match("/cat|more|tail|less|head|curl|nc|strings|sort|echo/i", $this->cmd))
{
exit('</br>flag能让你这么容易拿到吗？<br>');
}
if ($this->username === 'admin')
{
// echo "<br>right!<br>";
$a = `$this->cmd`;
var_dump($a);
}else
{
echo "</br>给你个安慰奖吧，hhh！</br>";
die();
}
}
}
$select = $_GET['code'];
$res=unserialize(@$select);
?>
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