83 lines
4.1 KiB
Docker
83 lines
4.1 KiB
Docker
FROM public.ecr.aws/docker/library/golang:1.21-alpine AS builder
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# Build the Go application
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WORKDIR /app
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COPY src/main.go .
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RUN go build -o challenge main.go
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# Final stage
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FROM public.ecr.aws/docker/library/ubuntu:20.04
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ARG PASSWORD
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ENV DEBIAN_FRONTEND=noninteractive
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# Install necessary packages
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RUN apt-get update && apt-get install -y nano openssh-server python3 curl netcat-traditional wget sudo nginx golang-go && rm -rf /var/lib/apt/lists/*
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# Create ctfuser and set password
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RUN useradd -m -d /home/ctfuser ctfuser && echo ctfuser:${PASSWORD} | chpasswd
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# Configure SSH
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RUN echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && echo "PermitRootLogin no" >> /etc/ssh/sshd_config && echo "AllowUsers ctfuser" >> /etc/ssh/sshd_config && echo "PermitEmptyPasswords no" >> /etc/ssh/sshd_config
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# Generate SSH host keys
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RUN ssh-keygen -A
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RUN mkdir -p /run/sshd && chmod 755 /run/sshd
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# Create working directories
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RUN mkdir -p /opt/files && chown -R ctfuser:ctfuser /opt && chmod 755 /opt && chmod 755 /opt/files
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# Copy the built binary from builder stage
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COPY --from=builder /app/challenge /opt/challenge
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RUN chmod 755 /opt/challenge && chown ctfuser:ctfuser /opt/challenge
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# Copy HTML template
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COPY src/index.html /opt/index.html
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RUN chmod 644 /opt/index.html
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# Create sample files for the file viewer
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RUN echo "Welcome to the File Viewer Challenge!\n\nThis is a simple file viewer application.\nYou can view different files using the /view endpoint.\n\nExample: /view?file=welcome.txt\n\nGood luck finding the flag!" > /opt/files/welcome.txt
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RUN echo "File Viewer v1.0\n\nThis application allows you to view text files stored in /opt/files/\n\nAvailable files:\n- welcome.txt\n- info.txt\n- hint.txt" > /opt/files/info.txt
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RUN echo "Hint: The flag is hidden somewhere on the system.\nMaybe you can try viewing other files?\nWhat about files outside the /opt/files/ directory?\n\nThink about path traversal..." > /opt/files/hint.txt
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RUN chmod 644 /opt/files/*.txt
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# Create flag file
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COPY flag.txt /flag.txt
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RUN chmod 444 /flag.txt && chown root:root /flag.txt
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# Copy main.go for users to patch
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COPY src/main.go /opt/main.go
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RUN chown ctfuser:ctfuser /opt/main.go && chmod 644 /opt/main.go
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# Create rebuild script for users
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RUN echo '#!/bin/bash' > /opt/rebuild.sh && \
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echo 'echo "Building patched challenge..."' >> /opt/rebuild.sh && \
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echo 'cd /opt' >> /opt/rebuild.sh && \
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echo 'go build -o challenge.new main.go' >> /opt/rebuild.sh && \
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echo 'if [ $? -ne 0 ]; then' >> /opt/rebuild.sh && \
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echo ' echo "Build failed!"' >> /opt/rebuild.sh && \
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echo ' exit 1' >> /opt/rebuild.sh && \
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echo 'fi' >> /opt/rebuild.sh && \
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echo 'chmod 755 /opt/challenge.new' >> /opt/rebuild.sh && \
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echo 'echo "Restarting challenge..."' >> /opt/rebuild.sh && \
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echo 'mv /opt/challenge.new /opt/challenge' >> /opt/rebuild.sh && \
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echo 'pkill -f /opt/challenge' >> /opt/rebuild.sh && \
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echo 'sleep 1' >> /opt/rebuild.sh && \
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echo '/opt/challenge >/tmp/challenge.log 2>&1 &' >> /opt/rebuild.sh && \
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echo 'echo "Challenge rebuilt and restarted!"' >> /opt/rebuild.sh && \
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chmod +x /opt/rebuild.sh && \
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chown ctfuser:ctfuser /opt/rebuild.sh
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# Configure nginx
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COPY nginx.conf /etc/nginx/sites-available/warmup
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RUN ln -s /etc/nginx/sites-available/warmup /etc/nginx/sites-enabled/warmup && rm -f /etc/nginx/sites-enabled/default && chown root:root /etc/nginx/sites-available/warmup && chmod 644 /etc/nginx/sites-available/warmup
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# Create startup script
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RUN echo '#!/bin/bash' > /opt/start.sh && echo 'set -e' >> /opt/start.sh && echo 'service ssh start' >> /opt/start.sh && echo 'nginx -t && service nginx start || echo "Nginx config error"' >> /opt/start.sh && echo 'su - ctfuser -c "/opt/challenge >/tmp/challenge.log 2>&1 &"' >> /opt/start.sh && echo 'sleep 1' >> /opt/start.sh && echo 'pgrep -f /opt/challenge > /tmp/challenge.pid' >> /opt/start.sh && echo 'trap "if [ -f /tmp/challenge.pid ]; then kill -TERM $(cat /tmp/challenge.pid) 2>/dev/null || true; fi; exit 0" SIGTERM SIGINT' >> /opt/start.sh && echo 'tail -f /dev/null' >> /opt/start.sh && chmod +x /opt/start.sh
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EXPOSE 8080 22
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USER root
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CMD ["/opt/start.sh"]
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