Make Dns Overhttps Bind9 Nginx
Introduction to DNS over HTTPS (DoH)
DNS over HTTPS (DoH) is a relatively new method of encrypting and tunneling Domain Name System (DNS) queries through an HTTPS connection. This allows for more secure communications between DNS servers and clients, as any network traffic is protected by the TLS/SSL tunnel that is established. The main advantages of using DoH are privacy and resistance to censorship. By using HTTPS, DoH prevents third parties and malicious actors from tampering with or observing DNS requests. Moreover, the encrypted nature of the tunnel makes it difficult or impossible to be blocked or censored in certain regions.
Setup Bind9 for DNS Over HTTPS
Bind9 is a popular DNS server software. It can be configured to use DoH, enabling more secure communication between DNS servers and clients. To set up Bind9 for DoH, first, install the Bind9 package on your server. Once the Bind9 software is installed and running, edit the Bind configuration file, located at /etc/bind/named.conf. Inside the configuration file, add the following lines to enable DoH:
options {
dnssec-enable no;
dnssec-validation no;
dnssec-lookaside auto;
dns-over-tls {
tls-port 853; }
};
This will enable the DNS-over-TLS feature, using port 853. Next, we need to configure the DoH client. In order for the DoH client to make requests to the DoH server, it will need an HTTPS endpoint. We will use Nginx to create an HTTPS endpoint for this purpose.
Setup Nginx for DNS Over HTTPS
Nginx is a powerful, versatile web server. It is a great choice for setting up a DoH endpoint because of its ease of use and ability to work with a wide range of protocols. To use Nginx for DoH, first, install the Nginx package on your server. Next, create a configuration file for Nginx, located at /etc/nginx/conf.d/doh.conf. Inside the configuration file, add the following lines to enable DoH:
server {
listen 443 ssl;
server_name doh.example.com;
location / {
ssl_certificate_key /etc/ssl/private/doh.example.com.key;
ssl_certificate /etc/ssl/certs/doh.example.com.crt;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass https://127.0.0.1:853;
}
}
This will enable Nginx to act as a proxy between the client and the Bind9 server. The client will make an HTTPS request to Nginx, and Nginx will forward that request to the Bind9 server using port 853. Once this is done, Restart Nginx to apply the changes. Now, your DoH server is up and running.
Testing DNS Over HTTPS
Now that Bind9 and Nginx are set up to use DoH, you can use the dig command to test your setup. This command will send a DNS query to the DoH server, and the server will return a response. For example, the following command will send an A record query to the server and return the response:
dig @doh.example.com +tls=doh www.example.com A
If the command is successful, the server will return the A record for www.example.com. If the command is unsuccessful, the server will return an error message. You can also use other tools, such as Curl, to test your setup. For example, the following command will send an A record query to the server using the Curl command:
curl –tlsv1.2 https://doh.example.com/www.example.com
If successful, the server will return the A record for www.example.com. If unsuccessful, the server will return an error message.
Conclusion
DNS over HTTPS is a powerful tool for protecting DNS requests and ensuring privacy. By setting up Bind9 and Nginx to use DoH, you can enable secure communications between DNS servers and clients. You can also use the dig and Curl commands to test your setup. With this guide, you now have the knowledge to set up your server for DoH and start enjoying the benefits of more secure DNS queries.
FAQs
- What is DNS over HTTPS?
DNS over HTTPS (DoH) is a method of encrypting and tunneling Domain Name System (DNS) queries through an HTTPS connection.
- What are the benefits of using DNS over HTTPS?
The main advantages of using DoH are privacy and resistance to censorship. By using HTTPS, DoH prevents third parties and malicious actors from tampering with or observing DNS requests, and the encrypted nature of the tunnel makes it difficult or impossible to be blocked or censored in certain regions.
- How do I test my DNS over HTTPS setup?
You can use the dig and Curl commands to test your setup. The dig command will send a DNS query to the DoH server, and the server will return a response. The Curl command will send an A record query to the server and return the response.
Thank you for reading this article. For more information and to learn how to configure DNS over HTTPS, please read the other related articles.
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