Restrict access to controller

Hello!

I need to restrict access to a controller.
I have tried placing a .htaccess file inside the controllers directory with code like this:

Code:

<FilesMatch "config\.php|function\.php|include\.php">
 Order allow,deny
 Deny from all
</FilesMatch>

But it doesn't seem to work

How can I restrict access to controller?

I hope somebody can point me in the right direction.

Best regards.