|  | # 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"]
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