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+# Use ubuntu 16.04
+FROM ubuntu:16.04
+
+RUN apt-get update && apt-get -y dist-upgrade --fix-missing --fix-broken
+
+# 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
+
+RUN adduser --disabled-password --gecos "" ksl
+RUN echo "ksl:sebuahrahasiamas" | chpasswd
+
+ADD chall/. /chall
+WORKDIR /chall
+
+RUN cp /usr/bin/ruby /usr/local/bin/
+RUN cp /usr/bin/curl /usr/local/bin/
+RUN echo 'KSL{n0T_0nLy_p1P3_L1n3_C4n_D0_Th4T}'  > /chall/flag.txt # ubah isi flagnya
+
+# Secure ENV
+
+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/header.rb # ubah nama file
+RUN chmod 775 /chall/header.rb # ubah nama file
+
+# Run Service
+
+RUN echo '#!/bin/bash'"\n(socat TCP-LISTEN:5550,reuseaddr,fork EXEC:"/chall/header.rb,su=nobody")" > /var/tmp/.start.sh && chmod +x /var/tmp/.start.sh
+
+CMD ["/var/tmp/.start.sh"]