Dockerfile

FROM buildpack-deps:bullseye

WORKDIR /app

# Update package lists and install required packages
RUN apt-get update && apt-get install -y \
  libgmp-dev \
  iptables \
  xl2tpd \
  kmod \
  supervisor \
  && rm -rf /var/lib/apt/lists/*

ENV STRONGSWAN_VERSION 5.5.0
ENV GPG_KEY 948F158A4E76A27BF3D07532DF42C170B34DBA77

RUN mkdir -p /usr/src/strongswan \
	&& cd /usr/src \
	&& curl -SOL "https://download.strongswan.org/strongswan-$STRONGSWAN_VERSION.tar.gz.sig" \
	&& curl -SOL "https://download.strongswan.org/strongswan-$STRONGSWAN_VERSION.tar.gz" \
	&& export GNUPGHOME="$(mktemp -d)" \
	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
	&& gpg --batch --verify strongswan-$STRONGSWAN_VERSION.tar.gz.sig strongswan-$STRONGSWAN_VERSION.tar.gz \
	&& tar -zxf strongswan-$STRONGSWAN_VERSION.tar.gz -C /usr/src/strongswan --strip-components 1 \
	&& cd /usr/src/strongswan \
	&& ./configure --prefix=/usr --sysconfdir=/etc \
		--enable-eap-radius \
		--enable-eap-mschapv2 \
		--enable-eap-identity \
		--enable-eap-md5 \
		--enable-eap-tls \
		--enable-eap-ttls \
		--enable-eap-peap \
		--enable-eap-tnc \
		--enable-eap-dynamic \
		--enable-xauth-eap \
		--enable-openssl \
	&& make -j \
	&& make install \
	&& rm -rf "/usr/src/strongswan*"

# Strongswan Configuration
ADD ipsec.conf /etc/ipsec.conf
ADD strongswan.conf /etc/strongswan.conf

# XL2TPD Configuration
ADD xl2tpd.conf /etc/xl2tpd/xl2tpd.conf
ADD options.xl2tpd /etc/ppp/options.xl2tpd

# Supervisor config
ADD supervisord.conf supervisord.conf
ADD kill_supervisor.py /usr/bin/kill_supervisor.py

ADD run.sh /run.sh
ADD vpn_adduser /usr/local/bin/vpn_adduser
ADD vpn_deluser /usr/local/bin/vpn_deluser
ADD vpn_setpsk /usr/local/bin/vpn_setpsk
ADD vpn_unsetpsk /usr/local/bin/vpn_unsetpsk
ADD vpn_apply /usr/local/bin/vpn_apply

# The password is later on replaced with a random string
ENV VPN_USER user
ENV VPN_PASSWORD password
ENV VPN_PSK password

RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"

RUN chmod -R 777 /app
VOLUME ["/etc/ipsec.d"]

EXPOSE 4500/udp 500/udp 1701/udp

CMD ["/run.sh"]