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			|  |  |  | # Use ubuntu 16.04 | 
		
	
		
			
			|  |  |  | FROM ubuntu:16.04 | 
		
	
		
			
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			|  |  |  | RUN apt-get update && apt-get -y dist-upgrade --fix-missing --fix-broken | 
		
	
		
			
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			|  |  |  | # install socat editor ssh | 
		
	
		
			
			|  |  |  | RUN apt-get install curl netcat-openbsd vim nano openssh-server socat lib32ncurses5 python python-pip python-dev ruby-full -y | 
		
	
		
			
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			|  |  |  | RUN adduser --disabled-password --gecos "" ksl | 
		
	
		
			
			|  |  |  | RUN echo "ksl:sebuahrahasiamas" | chpasswd | 
		
	
		
			
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			|  |  |  | ADD chall/. /chall #membuat direktory chall | 
		
	
		
			
			|  |  |  | WORKDIR /chall #direktory chall akan digunakan sebagai tempat kerja | 
		
	
		
			
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			|  |  |  | RUN cp /usr/bin/ruby /usr/local/bin/ | 
		
	
		
			
			|  |  |  | RUN echo 'KSL{t3RM1naL_Linux_3azy}'  > /chall/flag.txt # ubah isi flagnya | 
		
	
		
			
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			|  |  |  | # Secure ENV | 
		
	
		
			
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			|  |  |  | RUN echo 'alias kill="echo no kill please!"' >> ~/.bashrc | 
		
	
		
			
			|  |  |  | RUN chmod 700 /tmp /usr/bin/* /bin/* /dev/shm #memberi hak akses | 
		
	
		
			
			|  |  |  | 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 | 
		
	
		
			
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			|  |  |  | RUN chown root:ksl /chall/service_agent.rb # ubah nama file | 
		
	
		
			
			|  |  |  | RUN chmod 775 /chall/service_agent.rb # ubah nama file | 
		
	
		
			
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			|  |  |  | # Run Service | 
		
	
		
			
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			|  |  |  | RUN echo '#!/bin/bash'"\n(socat TCP-LISTEN:7000,reuseaddr,fork EXEC:"/chall/service_agent.rb,su=nobody")" > /var/tmp/.start.sh && chmod +x /var/tmp/.start.sh | 
		
	
		
			
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			|  |  |  | CMD ["/var/tmp/.start.sh"] |