container-openvpn/containerfiles/Containerfile

FROM ghcr.io/allanger/dumb-downloader as dudo
ARG OPENVPN_VERSION
RUN apt update && apt install gnupg tar -y
RUN mkdir /output
# ------------------------------------------------------
# -- Downlaod OpenVPN
# ------------------------------------------------------
RUN dudo -l "https://keys.openpgp.org/vks/v1/by-fingerprint/F554A3687412CFFEBDEFE0A312F5F7B42F2B01E7" -d security-openvpn-net.asc -p DUMMY
RUN gpg --import security-openvpn-net.asc
RUN dudo -l "https://swupdate.openvpn.org/community/releases/openvpn-{{ version }}.tar.gz.asc" -d /tmp/openvpn.asc -p ${OPENVPN_VERSION}
# ------------------------------------------------------
# -- todo: I should fix it later
# ------------------------------------------------------
# RUN gpg  --no-tty --verify /tmp/openvpn.asc
RUN dudo -l "https://swupdate.openvpn.org/community/releases/openvpn-{{ version }}.tar.gz " -d /tmp/openvpn.tar.gz -p ${OPENVPN_VERSION}
RUN tar -xf /tmp/openvpn.tar.gz  -C /tmp && rm -f /tmp/openvpn.tar.gz
RUN mv /tmp/openvpn-${OPENVPN_VERSION} /output/openvpn

FROM ubuntu as builder
# ------------------------------------------------------
# -- TODO: Define it only once
# ------------------------------------------------------
ARG OPENVPN_VERSION
COPY --from=dudo /output /src
RUN apt-get update &&\
      apt-get install -y wget tar unzip build-essential \
      libssl-dev iproute2 liblz4-dev liblzo2-dev \
      libpam0g-dev libpkcs11-helper1-dev libsystemd-dev \
      easy-rsa iptables pkg-config libcap-ng-dev
WORKDIR /src/openvpn
RUN ./configure --disable-systemd --enable-async-push --enable-iproute2
RUN make && make install
RUN mkdir /output
RUN cp $(which openvpn) /output/

# ------------------------------------------------------
# -- Final container
# ------------------------------------------------------
FROM ubuntu:22.04
LABEL maintainer="allanger <allanger@zohomail.com>"
COPY --from=builder /output /src
# -------------------------------------------------------
# -- Prepare system deps
# -------------------------------------------------------
RUN apt update && apt install openvpn easy-rsa iptables -y && \
  mv /src/openvpn $(which openvpn)

# Needed by scripts
ENV OPENVPN /etc/openvpn

# Prevents refused client connection because of an expired CRL
ENV EASYRSA_CRL_DAYS 3650

VOLUME ["/etc/openvpn"]

# Internally uses port 1194, remap if needed using `docker run -p 443:1194/tcp`
EXPOSE 1194

CMD ["ovpn_run"]

COPY --chmod='755' ./bin /usr/local/bin
# -----------------------------------------------------------
# -- Add support for OTP authentication using a PAM module
# -- I have no idea how it works yet
# -----------------------------------------------------------
WORKDIR /etc/openvpn