Prerequisites

• Self-prepared SSL certificate.
• The steps to apply for a free personal domain SSL certificate are omitted. Please search for free certificate application tutorials online.
• You need a .crt file and a .key file.

Deployment Diagram

Deployment for Reference

My WAF and website are on the same server.

Step 1: Modify the Port of the Application's Nginx

Because the WAF and the web application are on the same server, there will be port conflicts. So, first, change the application's own Nginx port to something other than 80 and 443. I used port 8000, but you can change it to any available port as long as it does not conflict with existing ports on the server.

To view existing ports on the server, use the command:

netstat -an|grep LISTEN|grep -v unix

Change the Nginx listen port from 80 to another port.

Reload the Nginx configuration:

nginx -t 
nginx -s reload

Step 2: Add a Protected Site in SafeLine WAF

Adding an HTTP Site

• Port: 80
• Since my WAF and site are on the same server, the upstream server is set to 127.0.0.1:8000. Modify according to your situation.

Adding an HTTPS Site

• Port: 443
• Check SSL and upload the certificate files. Modify according to your situation.
• The upstream server should point to the same web application address.

Submit the configuration.

Step 3: Modify SafeLine WAF Nginx Forwarding Configuration

The default path for SafeLine Nginx proxy configuration files is:

/data/safeline/resources/nginx/sites-enabled

Modify the site configuration file corresponding to port 80 to set up redirection from 80 to 443:

# Add this in the server block
rewrite ^(.*)$ https://$host$1 permanent;

Reload the SafeLine Nginx configuration:

# Test if the Nginx configuration is correct
docker exec -it safeline-tengine /usr/sbin/nginx -t

# Reload the configuration
docker exec -it safeline-tengine /usr/sbin/nginx -s reload

Step 4: Browser Testing

Access http://yoursite.com

Check if the request is redirected to https://yoursite.com

It should automatically redirect to HTTPS.

Here are the links about SafeLine WAF.
Github
Discord
Website