ping-service

ping-service/Dockerfile

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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 -y
+
+RUN adduser --disabled-password --gecos "" ksl
+RUN echo "ksl:sebuahrahasiamas" | chpasswd
+
+ADD chall/. /chall
+WORKDIR /chall
+
+RUN echo 'KSL{U14RZ_M4M4NXX_KERENZX_4ANEETTT!!}'  > /chall/flag.txt # ubah isi flagnya
+
+# Secure ENV
+
+RUN echo 'alias kill="echo no kill please!"' >> ~/.bashrc
+RUN chmod 700 /tmp /var/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
+
+
+RUN chown root:ksl /chall/ping-service.py # ubah nama file
+RUN chmod 775 /chall/ping-service.py # ubah nama file
+
+# Run Service
+
+RUN echo '#!/bin/bash'"\n(socat TCP-LISTEN:7000,reuseaddr,fork EXEC:"/chall/ping-service.py,su=nobody")" > /var/tmp/.start.sh && chmod +x /var/tmp/.start.sh
+
+CMD ["/var/tmp/.start.sh"]

ping-service/README.md

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-ping-service.py

ping-service/start.sh

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-#!/bin/bash
-#nc ip port
-
-socat TCP-LISTEN:5000,reuseaddr,fork EXEC:./ping-service.py