FROM ubuntu:22.04
 
RUN apt-get update && apt-get -y dist-upgrade && \
    apt-get install -y lib32z1 xinetd
 
RUN useradd -m ctf
 
WORKDIR /home/ctf
 
RUN  cp -R /usr/lib* /home/ctf
 
RUN mkdir /home/ctf/dev && \
    mknod /home/ctf/dev/null c 1 3 && \
    mknod /home/ctf/dev/zero c 1 5 && \
    mknod /home/ctf/dev/random c 1 8 && \
    mknod /home/ctf/dev/urandom c 1 9 && \
    chmod 666 /home/ctf/dev/*
 
RUN mkdir /home/ctf/bin && \
    cp /bin/sh /home/ctf/bin && \
    cp /bin/ls /home/ctf/bin && \
    cp /bin/cat /home/ctf/bin
 
COPY ./ctf.xinetd /etc/xinetd.d/ctf
COPY ./init.sh /init.sh
RUN echo "Blocked by ctf_xinetd" > /etc/banner_fail
 
RUN chmod +x /init.sh
 
COPY ./bin/ /home/ctf/
RUN chown -R root:ctf /home/ctf && \
    chmod -R 750 /home/ctf && \
    chmod 740 /home/ctf/flag
 
CMD ["/init.sh"]
 
EXPOSE 70