Server Signature is type of foot-printing in which the version number of web server module like Ngnix and PHP are considered as known by attackers for collection of data for foot-printing of servers. They are using the simple Linux commands or using some tools or some web browsers. On Alma / Rocky / Amazon Linux for hiding the server signature is necessary to remove the information from the sets to secure the web servers from the external attacks.

Step-1 : Check the Nginx version by typing

First verify if server is showing Nginx version or not by the command

# curl -I

Sample Output

HTTP/1.1 200 OK
Server: nginx/1.4.4
Date: Fri, 5 Jun 2015 11:38:47 CDT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/5.4.23
Set-Cookie: CACHED_FRONT_FORM_KEY=bCunlLxt1Sw1qHfw; path=/
Step-2 : Edit the Nginx Configuration File

Goto nginx.conf

# vi /etc/nginx/nginx.conf

Add below parameter and save

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server_tokens off;

Like this

user nginx;
worker_processes 4;
error_log /var/log/nginx/error.log warn;
pid /var/run/;
events { worker_connections 1024; }
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
' $status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
keepalive_timeout 65;
server_tokens off;
gzip on;
gzip_static on;
gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;
gzip_buffers 16 8k;
gzip_vary on;
## Detect when HTTPS is used
map $scheme $fastcgi_https
default off;
https on;
include /etc/nginx/conf.d/*.conf;
Step-3 : Edit the PHP configuration file to edit the settings

Then goto php.ini file and set expose_php = Off

# vi /etc/php.ini
expose_php = Off

Note: (O must be capital)

Step-4 : Check and verify the Nginx and PHP-FPM services

Reload Nginx and php-fpm services and check again

# curl -I

It must now hide version and server signature as shown.

HTTP/1.1 200 OK
Server: nginx
Date: Fri, 5 Jun 2015 11:56:03 CDT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
Set-Cookie: CACHED_FRONT_FORM_KEY=NX3yUkgwxgJwQRLR; path=/

Congratulations now you have hidden the Nginx server signature and PHP version on Ubuntu and Alma / Rocky / Amazon Linux.