add openvpn image

images/openvpn/Dockerfile

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+# Original credit: https://github.com/jpetazzo/dockvpn
+# Original credit: https://github.com/kylemanna/docker-openvpn
+
+# Smallest base image
+FROM alpine:latest
+
+LABEL maintainer="Carlos Giraldo <cgiraldo@gradiant.org>"
+
+# Testing: pamtester
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories && \
+    apk add --update openvpn iptables bash easy-rsa openvpn-auth-pam google-authenticator pamtester libqrencode && \
+    ln -s /usr/share/easy-rsa/easyrsa /usr/local/bin && \
+    rm -rf /tmp/* /var/tmp/* /var/cache/apk/* /var/cache/distfiles/*
+
+# Needed by scripts
+ENV OPENVPN=/etc/openvpn
+ENV EASYRSA=/usr/share/easy-rsa \
+    EASYRSA_CRL_DAYS=3650 \
+    EASYRSA_PKI=$OPENVPN/pki
+
+VOLUME ["/etc/openvpn"]
+
+# Internally uses port 1194/udp, remap using `docker run -p 443:1194/tcp`
+EXPOSE 1194/udp
+
+CMD ["ovpn_run"]
+
+ADD ./bin /usr/local/bin
+RUN chmod a+x /usr/local/bin/*
+
+# Add support for OTP authentication using a PAM module
+ADD ./otp/openvpn /etc/pam.d/

images/openvpn/bin/ovpn_copy_server_files

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+#!/bin/bash
+## @licence MIT <http://opensource.org/licenses/MIT>
+## @author Copyright (C) 2015 Robin Schneider <ypid@riseup.net>
+
+set -e
+
+if [ -z "$OPENVPN" ]; then
+    export OPENVPN="$PWD"
+fi
+if ! source "$OPENVPN/ovpn_env.sh"; then
+    echo "Could not source $OPENVPN/ovpn_env.sh."
+    exit 1
+fi
+
+TARGET="$OPENVPN/server"
+if [ -n "$1" ]; then
+    TARGET="$1"
+fi
+mkdir -p "${TARGET}"
+
+## Ensure that no other keys then the one for the server is present.
+rm -rf "$TARGET/pki/private" "$TARGET/pki/issued"
+
+FILES=(
+    "openvpn.conf"
+    "ovpn_env.sh"
+    "pki/private/${OVPN_CN}.key"
+    "pki/issued/${OVPN_CN}.crt"
+    "pki/dh.pem"
+    "pki/ta.key"
+    "pki/ca.crt"
+    "ccd"
+)
+
+if [ -f "${OPENVPN}/pki/crl.pem" ]; then
+    FILES+=("pki/crl.pem")
+fi
+
+# Ensure the ccd directory exists, even if empty
+mkdir -p "ccd"
+
+# rsync isn't available to keep size down
+# cp --parents isn't in busybox version
+# hack the directory structure with tar
+tar cf - -C "${OPENVPN}" "${FILES[@]}" | tar xvf - -C "${TARGET}"
+
+echo "Created the openvpn configuration for the server: $TARGET"