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Killswitch added with firewall, fixes #3

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This commit is contained in:
Quentin McGaw
2018-06-06 22:44:11 -04:00
parent f6d6b69043
commit 7aa43274b1
3 changed files with 47 additions and 4 deletions
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4
Dockerfile
View File

@@ -6,7 +6,7 @@ LABEL maintainer="quentin.mcgaw@gmail.com" \
ram="12MB" \
cpu_usage="Low" \
github="https://github.com/qdm12/private-internet-access-docker"
RUN apk add -q --progress --no-cache --update openvpn unbound ca-certificates && \
RUN apk add -q --progress --no-cache --update openvpn unbound ca-certificates iptables && \
apk add -q --progress --no-cache --update --virtual=build-dependencies unzip && \
mkdir /openvpn-udp-normal /openvpn-udp-strong /openvpn-tcp-normal /openvpn-tcp-strong && \
wget -q https://www.privateinternetaccess.com/openvpn/openvpn.zip \
@@ -29,4 +29,4 @@ ENV ENCRYPTION=strong \
REGION=Germany
COPY entrypoint.sh /
RUN chmod +x /entrypoint.sh
ENTRYPOINT /entrypoint.sh
ENTRYPOINT /entrypoint.sh

4
README.md
View File

@@ -4,6 +4,8 @@ Docker VPN client to private internet access servers using [OpenVPN](https://ope
Optionally set the protocol (TCP, UDP) and the level of encryption using Docker environment variables.
A killswitch is implemented with a firewall (*iptables*), only allowing traffic with PIA servers on needed ports / protocols.
[![PIA Docker OpenVPN](https://github.com/qdm12/private-internet-access-docker/raw/master/readme/title.png)](https://hub.docker.com/r/qmcgaw/private-internet-access/)
[![Build Status](https://travis-ci.org/qdm12/private-internet-access-docker.svg?branch=master)](https://travis-ci.org/qdm12/private-internet-access-docker)
@@ -126,7 +128,7 @@ Otherwise you can follow these instructions:
1. Run the **curl** Docker container using your *pia* container with:
```bash
docker run --rm --network=container:pia byrnedo/alpine-curl ifconfig.co
docker run --rm --network=container:pia byrnedo/alpine-curl -s ifconfig.co
```
If the displayed IP address appears and is different that your host IP address,

43
entrypoint.sh
View File

@@ -7,7 +7,48 @@ echo "nameserver 127.0.0.1" > /etc/resolv.conf
echo "options ndots:0" >> /etc/resolv.conf
printf "DONE\nStarting Unbound to connect to Cloudflare DNS 1.1.1.1 at its TLS endpoint..."
unbound
printf "DONE\nSetting firewall for killswitch purposes...\n Detecting local subnet..."
SUBNET=$(ip route show default | tail -n 1 | awk '// {print $1}')
printf "$SUBNET\n Detecting IP addresses corresponding to $REGION.privateinternetaccess.com..."
VPNIPS=$(nslookup $REGION.privateinternetaccess.com localhost | tail -n +5 | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
for ip in $VPNIPS
do
printf "\n $ip"
done
printf "\n Deleting all iptables rules..."
iptables --flush
iptables --delete-chain
iptables -t nat --flush
iptables -t nat --delete-chain
iptables -P OUTPUT DROP
printf "DONE\n Adding rules to accept local loopback traffic..."
iptables -A INPUT -j ACCEPT -i lo
iptables -A OUTPUT -j ACCEPT -o lo
printf "DONE\n Adding rules to accept traffic of subnet $SUBNET..."
#iptables -A INPUT --src $SUBNET -j ACCEPT -i eth0
iptables -A OUTPUT -d $SUBNET -j ACCEPT -o eth0
printf "DONE\n Determining port to be used with PIA..."
if [ "$PROTOCOL-$ENCRYPTION" == "tcp-normal" ]; then
PORT=502
elif [ "$PROTOCOL-$ENCRYPTION" == "tcp-strong" ]; then
PORT=501
elif [ "$PROTOCOL-$ENCRYPTION" == "udp-normal" ]; then
PORT=1198
elif [ "$PROTOCOL-$ENCRYPTION" == "udp-strong" ]; then
PORT=1197
fi
printf "$PROTOCOL $PORT"
for ip in $VPNIPS
do
printf "\n Adding rules to accept traffic with VPN IP address $ip on port $PROTOCOL $PORT..."
iptables -A OUTPUT -j ACCEPT -d $ip -o eth0 -p $PROTOCOL -m $PROTOCOL --dport $PORT
iptables -A INPUT -j ACCEPT -s $ip -i eth0 -p $PROTOCOL -m $PROTOCOL --sport $PORT
printf "DONE"
done
printf "\n Adding rules to accept traffic going through the tun device..."
iptables -A INPUT -j ACCEPT -i tun0
iptables -A OUTPUT -j ACCEPT -o tun0
printf "DONE\nStarting OpenVPN using $PROTOCOL with $ENCRYPTION encryption\n"
cd /openvpn-$PROTOCOL-$ENCRYPTION
openvpn --config "$REGION.ovpn" --auth-user-pass /auth.conf
printf "\n\nExiting..."
printf "\n\nExiting..."