Dockerfile

FROM ubuntu
MAINTAINER James Shuttleworth <csx239@coventry.ac.uk>

RUN apt-get update
RUN apt-get -y install net-tools
RUN apt-get -y install openssh-server sudo
RUN apt-get -y install zip unzip

COPY starter.sh /root/
RUN chmod u+x /root/starter.sh
RUN useradd -ms /bin/bash tri

RUN echo "tri:force"|chpasswd
RUN echo "tri ALL = NOPASSWD: /usr/bin/unzip" >> /etc/sudoers
RUN chmod a+rx /root/
RUN echo "This is a file only accessible by root" > /root/flag.txt
RUN chmod a-rwx /root/flag.txt

CMD ["/root/starter.sh"]