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PiHole + Wireguard Road Warrior Setup

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I have setup a very basic VPN setup while traveling to prevent tracking & annoying ads on unsecured public WiFi networks. It all runs on a tiny t2.nano AWS EC2 instance costing less than $5/month.

The box


All this runs on a single t2.nano AWS instance running in the nearest region running Ubuntu server.

Pi-hole (DNS + AdBlocker)
A simply trusty old cURL to bash?‍
curl -sSL https://install.pi-hole.net | bash

WireGuard
Setting this up is quite easy after you get the hang of the key generation commands.
add-apt-repository ppa:wireguard/wireguard
apt-get update
apt-get install wireguard

cd /etc/wireguard
wg genkey | tee privatekey | wg pubkey > publickey

I then muck around inside vim to create /etc/wireguard/wg0.conf which contains something like:
Note check what your outgoing interface is. It's probably not ens5 like mine depending on your distro.

[Interface]
Address = 192.168.13.1
PrivateKey = [aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1vYXZNdFVXREJUTQ==] change me
ListenPort = 51820
PostUp = sysctl net.ipv4.ip_forward=1; iptables -A FORWARD -i %i -j ACCEPT; iptables -t nat -A POSTROUTING -s 192.168.13.0/24 -o ens5 -j MASQUERADE; /usr/local/bin/pihole restartdns
PostDown = iptables -t nat -D POSTROUTING -s 192.168.13.0/24 -o ens5 -j MASQUERADE

[Peer]
PublicKey = [aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1vYXZNdFVXREJUTQ==] change me
AllowedIPs = 192.168.13.2/32
...
etc etc

The post-up/stop commands ensure traffic is forwarded out of the machine's IP address. You might need to replace ens5 to your default route's interface. Pihole is restarted to make sure it's listening on the wg0 interface for clients to use it as the DNS server.
Sample client config file
[Interface]
PrivateKey = aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1vYXZNdFVXREJUTQ==
Address = 192.168.13.2/32
DNS = 192.168.13.1

[Peer]
# the server
PublicKey = aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1vYXZNdFVXREJUTQ== change me
AllowedIPs = 0.0.0.0/0
# The server IP/udp port wg listens on
Endpoint = 13.37.13.37:51820
PersistentKeepalive = 25

systemctl enable wg-quick@wg0
systemctl start wg-quick@wg0

systemctl status wg-quick@wg0
wg-quick@wg0.service - WireGuard via wg-quick(8) for wg0
   Loaded: loaded (/lib/systemd/system/wg-quick@.service; enabled; vendor preset: enabled)
   Active: active (exited) since Fri 2019-10-18 14:00:55 UTC; 21s ago
     Docs: man:wg-quick(8)
           man:wg(8)
           https://www.wireguard.com/
           https://www.wireguard.com/quickstart/
           https://git.zx2c4.com/WireGuard/about/src/tools/man/wg-quick.8
           https://git.zx2c4.com/WireGuard/about/src/tools/man/wg.8
  Process: 18126 ExecStart=/usr/bin/wg-quick up wg0 (code=exited, status=0/SUCCESS)
 Main PID: 18126 (code=exited, status=0/SUCCESS)

Oct 18 14:00:55 ip-172-31-5-144 systemd[1]: Starting WireGuard via wg-quick(8) for wg0...
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] ip link add wg0 type wireguard
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] wg setconf wg0 /dev/fd/63
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] ip -4 address add 192.168.13.1 dev wg0
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] ip link set mtu 8921 up dev wg0
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] ip -4 route add 192.168.13.2/32 dev wg0
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: [#] sysctl net.ipv4.ip_forward=1; iptables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -s 192.168.13.0/24 -o ens5 -j MASQUERADE; /usr/local/bin/pihole restartdns
Oct 18 14:00:55 ip-172-31-5-144 wg-quick[18126]: net.ipv4.ip_forward = 1
Oct 18 14:00:55 ip-172-31-5-144 systemd[1]: Started WireGuard via wg-quick(8) for wg0.

Everything should be running now but Pihole needs a change to allow it to listen for DNS requests on the wg0 interface. I don't know how to do this automatically yet.
First we must set a password for pihole:

pihole -a -p
  1. Connect to the VPN
  2. visit http://192.168.13.1/admin/settings.php?tab=dns over the VPN
  3. change Interface Listening Behaviour to : Listen on all interfaces, permit all origins
  4. restart pihole
  5. Note Make sure not to allow public traffic on port 53 to prevent open dns resolver abuse. AWS security groups solve this for me.

Done!

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