# Use ubuntu 16.04 FROM ubuntu:16.04 EXPOSE 2020 RUN apt-get update # install socat editor ssh RUN apt-get install socat -y RUN adduser --disabled-password --gecos "" ksl RUN echo "ksl:sebuahrahasiamas" | chpasswd RUN mkdir chall WORKDIR /chall # Secure ENV COPY flag.txt . COPY version002 . RUN echo 'alias kill="echo no kill please!"' >> ~/.bashrc RUN chmod 700 /tmp /usr/bin/* /bin/* /dev/shm # RUN chmod 755 /usr/bin/env /bin/dash /bin/bash /bin/sh /bin/nc /bin/cat /usr/bin/curl /usr/bin/groups /usr/bin/id /bin/ls /usr/bin/python /usr/bin/ruby RUN chown root:ksl /chall/version002 RUN chmod 775 /chall/version002 # Run Service RUN echo '#!/bin/bash'"\n(socat TCP-LISTEN:2020,reuseaddr,fork EXEC:"/chall/version002,su=nobody")" > /var/tmp/.start.sh && chmod +x /var/tmp/.start.sh CMD ["/var/tmp/.start.sh"]