FROM ubuntu:20.04 RUN export DEBIAN_FRONTEND=noninteractive && apt update -y && apt -y install xinetd python3 python3-pip RUN useradd ctf WORKDIR /app RUN chown ctf /app COPY challenge.py . COPY numpymt.xinetd /etc/xinetd.d/numpymt RUN pip install pycryptodome RUN pip install numpy CMD xinetd -dontfork