Dockerfile.debian

FROM debian:buster

RUN apt-get update

RUN apt-get install -y openssh-server sudo trickle

RUN mkdir /var/run/sshd

RUN echo "root:userland" | chpasswd

RUN sed -ri 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
RUN sed -ri 's/#PasswordAuthentication yes/PasswordAuthentication no/g' /etc/ssh/sshd_config

RUN mkdir /root/.ssh

# Allow SSH Access and give shell for the userland user
RUN useradd -m -s /bin/bash userland && \
  mkdir /home/userland/.ssh && \
  chown userland:userland /home/userland/.ssh && \
  chmod 0700 /home/userland/.ssh && \
  touch /home/userland/.ssh/authorized_keys && \
  chown userland:userland /home/userland/.ssh/authorized_keys && \
  chmod 0600 /home/userland/.ssh/authorized_keys && \
  echo "userland:userland" | chpasswd &&  \
  usermod -aG sudo userland && \
  touch /home/userland/.sudo_as_admin_successful

RUN echo '#!/bin/bash\n\
run_countdown(){\n\
   if [ ! -f /etc/end_time ]; then\n\
      return 0;\n\
   fi\n\
   END_TIME=`cat /etc/end_time`;\n\
   while sleep 1;\n\
   do\n\
      CURRENT_TIME=`date +%s`;\n\
      if [ "$CURRENT_TIME" -gt "$END_TIME" ]; then\n\
         REMAINING_TIME=0;\n\
      else\n\
         REMAINING_TIME=$((END_TIME-CURRENT_TIME));\n\
      fi\n\
      if [ "$REMAINING_TIME" -gt "600" ]; then\n\
         COLOR_ON="\e[34m"\n\
         COLOR_OFF="\e[39m"\n\
         BLINK_ON=""\n\
         BLINK_OFF=""\n\
      elif [ "$REMAINING_TIME" -gt "120" ]; then\n\
         COLOR_ON="\e[33m"\n\
         COLOR_OFF="\e[39m"\n\
         BLINK_ON=""\n\
         BLINK_OFF=""\n\
      else\n\
         COLOR_ON="\e[31m"\n\
         COLOR_OFF="\e[39m"\n\
         BLINK_ON="\e[5m"\n\
         BLINK_OFF="\e[25m"\n\
      fi\n\
      tput sc;\n\
      tput cup 0 $(($(tput cols)-15));\n\
      FORMATTED_COUNTDOWN=$(printf "%02d:%02d" $((REMAINING_TIME/60)) $((REMAINING_TIME%60)));\n\
      echo -e "$BLINK_ON$COLOR_ON$FORMATTED_COUNTDOWN Remaining$COLOR_OFF$BLINK_OFF";\n\
      tput rc;\n\
   done\n\
}\n\
run_countdown &'\
  >> /etc/profile.d/countdown.sh

RUN chmod +x /etc/profile.d/countdown.sh

RUN echo '#!/bin/sh\n\
  END_TIME=`date +%s`\n\
  END_TIME=$((END_TIME+TIME_LIMIT))\n\
  echo $END_TIME > /etc/end_time\n\
  echo $SSH_KEY > /home/userland/.ssh/authorized_keys\n\
  exec trickle -s -u $BANDWIDTH -d $BANDWIDTH /usr/sbin/sshd -D'\
  >> /usr/bin/run_with_limits.sh

RUN chmod +x /usr/bin/run_with_limits.sh

#Clean up
RUN apt-get clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

EXPOSE 22

ENTRYPOINT ["/usr/bin/run_with_limits.sh"]