In the previous blog entry [Pi-hole with DNS-over-TLS] I set up stubby for dns-over-tls on the pi-hole. I want to do the same now for DNS-over-HTTPS (DoH), but neither Stubby nor Unbound support the young protocol which answers DNS queries via HTTPS. Some browsers have now integrated DoH, but I would like to protect all DNS queries from my home network. Therefore I use the client of cloudflare written in Go:
More about the pi-hole and installation instructions can be found here:
- Kuketz Blog | Pi-Hole: black hole for advertising
Basically there is an existing documentation at pi-hole.net how to set up DNS-over-HTTPS with cloudflared, but I would like to optimize the installation for me so that I can use multiple clients at the same time.
cloudflared can be downloaded at Cloudflare as binary and is ready for use after a small configuration.
On the Raspberry Pi:
cd wget https://bin.equinox.io/c/VdrWdbjqyF/cloudflared-stable-linux-arm.tgz tar -xvzf cloudflared-stable-linux-arm.tgz cp ./cloudflared /usr/local/bin chmod +x /usr/local/bin/cloudflared
For the service we use our own user:
sudo useradd -s /usr/sbin/nologin -r -M cloudflared sudo chown cloudflared:cloudflared /usr/local/bin/cloudflared # auto-update the binary
Your DNS Choose
Carefully choose your DNS provider because you are exposing your data to it. Who you trust is your decision.
There are many alternatives and probably better options than Quad9.
Cloudflare also offers DNS-over-HTTPS, but I would rather use the service of Quad9, so I use the IP
18.104.22.168 as upstream.
sudo vi /lib/systemd/system/cloudflared.service
[Unit] Description=cloudflared DNS over HTTPS proxy After=syslog.target network-online.target [Service] Type=simple User=cloudflared ExecStart=/usr/local/bin/cloudflared proxy-dns --address 127.0.3.3 --port 5353 --upstream https://22.214.171.124/dns-query Restart=on-failure RestartSec=10 KillMode=process [Install] WantedBy=multi-user.target
And activate and restart the restart service:
sudo systemctl daemon-reload sudo systemctl enable cloudflared sudo systemctl start cloudflared
To make the pi-hole statistics easier to see which DNS queries are now answered via stubby or unbound or cloudflared, the IP of the service can be entered in
cloudflared appears instead of
127.0.3.3. The same, can of course, be done for all other clients.
echo "127.0.3.3 cloudflared" >> /etc/hosts
The active cloudflared service can now be configured in the pi-hole as custom DNS server. To do this, enter the local IP of the service and the port of the service under "Settings > DNS" for Upstream DNS Servers under "custom": e.g.
After saving, the pi-hole should now forward DNS requests that are not cached or blocked to
pi@pi-hole:~ $ dig @127.0.3.3 -p 5353 blog.sandchaschte.ch ; <<>> DiG 9.10.3-P4-Raspbian <<>> @127.0.3.3 -p 5353 blog.sandchaschte.ch ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7383 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;blog.sandchaschte.ch. IN A ;; ANSWER SECTION: blog.sandchaschte.ch. 900 IN CNAME sandchaschte.ch. sandchaschte.ch. 900 IN A 126.96.36.199 ;; Query time: 245 msec ;; SERVER: 127.0.3.3#5353(127.0.3.3) ;; WHEN: Fri Jan 18 15:54:23 UTC 2019 ;; MSG SIZE rcvd: 129
It works. 🎉
Maybe I'll do an evaluation which of the clients (Unbound with DoT, Stubby with DoT or Cloudflared with DoH) has a better performance, so I can continue surfing fast as possible 🙂.