FROM ubuntu:22.04
 
RUN apt-get update && \
    apt-get install -y sudo ssh less
 
RUN useradd -m hacker

RUN echo "hacker:hacker0619" | chpasswd

RUN mkdir /var/run/sshd


WORKDIR /home/hacker


RUN mkdir /home/hacker/dev && \
    mknod /home/hacker/dev/null c 1 3 && \
    mknod /home/hacker/dev/zero c 1 5 && \
    mknod /home/hacker/dev/random c 1 8 && \
    mknod /home/hacker/dev/urandom c 1 9 && \
    chmod 666 /home/hacker/dev/*
 
RUN mkdir /home/hacker/bin && \
    cp /bin/ls /home/hacker/bin && \
    cp /bin/cat /home/hacker/bin && \
    cp /bin/head /home/hacker/bin && \
    cp /bin/more /home/hacker/bin && \
    cp /bin/tac /home/hacker/bin

COPY ./bin/ /home/hacker/
RUN chown -R root:hacker /home/hacker && \
    chmod -R 750 /home/hacker && \
    chmod 700 /home/hacker/flag && \
    chmod u+s /home/hacker/bin/tac
 
CMD ["/usr/sbin/sshd", "-D"]
 
EXPOSE 22