Dockerfile.sshbox

# Final stage
FROM ubuntu:24.04

ENV DEBIAN_FRONTEND=noninteractive

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    ca-certificates \
    tzdata \
    docker.io \
    bash \
    wget \
    curl \
    openssh-server \
    sudo

# Configure SSH
RUN mkdir /var/run/sshd
RUN echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config

# Create startup script
RUN echo '#!/bin/bash\n\
if [ -n "$SSH_USER" ]; then\n\
    if [ "$SSH_USER" = "root" ]; then\n\
        echo "PermitRootLogin yes" >> /etc/ssh/sshd_config\n\
        if [ -n "$SSH_PASSWORD" ]; then\n\
            echo "root:$SSH_PASSWORD" | chpasswd\n\
        fi\n\
    else\n\
        echo "PermitRootLogin no" >> /etc/ssh/sshd_config\n\
        useradd -m -s /bin/bash $SSH_USER\n\
        if [ -n "$SSH_PASSWORD" ]; then\n\
            echo "$SSH_USER:$SSH_PASSWORD" | chpasswd\n\
        fi\n\
        if [ -n "$SUDO_ACCESS" ] && [ "$SUDO_ACCESS" = "true" ]; then\n\
            echo "$SSH_USER ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/$SSH_USER\n\
        fi\n\
    fi\n\
fi\n\
/usr/sbin/sshd -D' > /start.sh

RUN chmod +x /start.sh

EXPOSE 22

CMD ["/start.sh"]