文件部署

from hashlib import sha256
import socketserver
from secret import flag
import signal
import string
import random
import os


class Task(socketserver.BaseRequestHandler):
    def _recvall(self):
        BUFF_SIZE = 2048
        data = b''
        while True:
            part = self.request.recv(BUFF_SIZE)
            data += part
            if len(part) < BUFF_SIZE:
                break
        return data.strip()

    def send(self, msg, newline=True):
        try:
            if newline:
                msg += b'\n'
            self.request.sendall(msg)
        except:
            pass

    def recv(self, prompt=b'[-] '):
        self.send(prompt, newline=False)
        return self._recvall()

    def proof_of_work(self):
        random.seed(os.urandom(8))
        proof = ''.join(
            [random.choice(string.ascii_letters+string.digits) for _ in range(20)])
        _hexdigest = sha256(proof.encode()).hexdigest()
        self.send(f"[+] sha256(XXXX+{proof[4:]}) == {_hexdigest}".encode())
        x = self.recv(prompt=b'[+] Plz tell me XXXX: ')
        if len(x) != 4 or sha256(x+proof[4:].encode()).hexdigest() != _hexdigest:
            return False
        return True

    def handle(self):
        signal.alarm(60)
        if not self.proof_of_work():
            self.send(b'[!] Wrong!')
            return

        self.send(b'here is your flag')
        self.send(flag)


class ThreadedServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
    pass


class ForkedServer(socketserver.ForkingMixIn, socketserver.TCPServer):
    pass


if __name__ == "__main__":
    HOST, PORT = '0.0.0.0', 10001
    server = ForkedServer((HOST, PORT), Task)
    server.allow_reuse_address = True
    print(HOST, PORT)
    server.serve_forever()

FROM python:3.8
LABEL Description="baby_try" VERSION='1.0'

COPY server.py .
COPY secret.py .

RUN chmod +x server.py

EXPOSE 12345	# 仅仅是申明，没有实际用，容器都是随机映射的，这里方便编写者查看

CMD ["python", "server.py"]

flag=b'flag{hahahahah}'

docker部署

创建镜像

$ docker build . -t baby_try

启动容器

$ docker run --name trytry -d -idt -p 12345:10001 baby_try