How to Enable OCSP Stapling in Nginx

OCSP (Online Certificate Status Protocol) stapling is a feature that allows Nginx to provide the OCSP response along with the SSL/TLS certificate during the SSL handshake, reducing the need for clients to independently check the certificate’s revocation status with the certificate authority. Here’s how you can enable OCSP stapling in Nginx:

1. Verify Certificate Authority Supports OCSP Stapling:

Ensure that the Certificate Authority (CA) that issued your SSL certificate supports OCSP stapling. Most reputable CAs support OCSP stapling.

2. Enable OCSP Stapling in Nginx:

Edit your Nginx SSL configuration file. This is typically located in /etc/nginx/sites-available/ or within the http block of your nginx.conf.

server {
    # Your existing server configuration...

    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /path/to/your/ssl_trusted_certificate.pem;
}

• ssl_stapling on;: This enables OCSP stapling.
• ssl_stapling_verify on;: This instructs Nginx to verify the OCSP response.
• ssl_trusted_certificate /path/to/your/ssl_trusted_certificate.pem;: This points to a file containing trusted CA certificates. It’s important to include the CA certificates in this file to ensure the OCSP response is trusted.

3. Obtain the CA Certificates:

You’ll need to combine the root CA certificate and any intermediate CA certificates into a single .pem file. You can often find these certificates on your CA’s website.

For example:

cat intermediate.pem root.pem > ssl_trusted_certificate.pem

4. Test and Reload Nginx:

Before applying the changes, test your Nginx configuration:

sudo nginx -t

If the test is successful, reload Nginx to apply the configuration changes:

sudo systemctl reload nginx

5. Monitor OCSP Stapling (optional):

You can monitor the OCSP stapling status using various tools or by checking the SSL Labs report for your website.

6. Verify OCSP Stapling is Working:

Use online tools or browser developer tools to verify that OCSP stapling is indeed enabled for your website.

By following these steps, you’ve enabled OCSP stapling in Nginx, which enhances the security and performance of your SSL/TLS connections by providing OCSP responses during the handshake process. This helps validate the status of your SSL certificate without requiring additional requests to the certificate authority.