Dockerfile

FROM ubuntu:24.04

# Set environment variables to avoid interactive prompts during installation
ENV DEBIAN_FRONTEND=noninteractive

# Install OpenSSH server, clean up, create directories, set permissions, and configure SSH
RUN apt update \
     && (echo "y") | unminimize \
     && apt install -y ubuntu-desktop \
     && apt install -y sudo iproute2 iputils-ping openssh-server telnet curl \
     && apt clean \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
     && (echo "password"; echo "password") | passwd ubuntu \
     && mkdir -p /home/ubuntu/.ssh \
     && chown -R ubuntu /home/ubuntu \
     && mkdir /run/sshd \
     && echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config \
     && echo "PermitRootLogin no" >> /etc/ssh/sshd_config \
     && sudo mkdir -p /etc/apt/keyrings && curl -fsSL https://packages.openvpn.net/packages-repo.gpg | sudo tee /etc/apt/keyrings/openvpn.asc \
     && echo "deb [signed-by=/etc/apt/keyrings/openvpn.asc] https://packages.openvpn.net/openvpn3/debian noble main" | sudo tee /etc/apt/sources.list.d/openvpn-packages.list \
     && sudo apt update \
     && sudo apt -y install openvpn3

# Expose SSH port
EXPOSE 22

# Start SSH server
CMD /usr/sbin/sshd -D