Most exploits gain entry via the web server. The following 2 methods are simple and effective ways to prevent that. These methods assume the web server does not need anonymous access.
First method
Password protect web folders. You will have to log in once via a web browser. Tell the browser to save the log in info when it asks so you do not have to log in again.
mkdir -p /etc/pbx
# Create password file and first user htpasswd -c /etc/pbx/wwwpasswd someusername
# Add additional users to existing password file
htpasswd /etc/pbx/wwwpasswd someotherusername
nano /var/www/html/.htaccess
# .htaccess files require AllowOverride On in /etc/httpd/conf/httpd.conf AuthType Basic AuthName "Restricted Access" AuthUserFile /etc/pbx/wwwpasswd Require valid-user
Alternatively, the authentication can be added to an apache config file such as /etc/httpd/conf.d/myauthentication.conf.
For Apache v2.2
<Directory /var/www/html> AuthType Basic AuthName "Restricted Area" AuthUserFile /etc/pbx/wwwpasswd Require valid-user </Directory>
For Apache v2.4
<Location />
AuthType Basic
AuthName "Restricted Area"
AuthUserFile /etc/pbx/wwwpasswd
Require valid-user
</Location>
To bypass this extra security on the user control panel (http://xx.xx.xx.xx/ucp) add the following to the same file.
For Apache 2.2
<Directory /var/www/html/ucp> Satisfy Any
Allow from All
</Directory>
For Apache 2.4, put it after the other Location directive
<Location "/ucp" > Require all granted </Location>
If using SSL certificates.
For Apache 2.2
<Directory /var/www/html/.well-known> Require all granted </Directory>
<Directory /var/www/html/.freepbx-known> Require all granted </Directory>
For Apache 2.4
<Location /.well-known> Require all granted </Location>
<Location /.freepbx-known> Require all granted </Location>
Second Method
Whitelist protect web folders. If browser http access is only required from certain IP addresses or ranges of addresses.
nano /etc/httpd/conf.d/whitelist.conf
For Apache v2.2
<Location /> Order Deny,Allow Deny from all # Allow from x.x.x.x Allow from x.x.x.x x.x.x.x x.x.x.x Allow from somedomain.com Allow from x.x Allow from x.x.x.0/255.255.255.0 # #See http://httpd.apache.org/docs/2.2/mod/mod_authz_host.html for more examples # </Location>
For Apache v2.4
<Directory "/"> <RequireAny/> ## This first one should only be uncommented when full anonymous access is required # Require all granted Require ip x.x.x.x Require ip x.x.x.x x.x.x.x x.x.x.x Require host somedomain.com Require ip x.x Require ip x.x.x.0/255.255.255.0 # #See http://httpd.apache.org/docs/2.4/mod/mod_authz_host.html#requiredredirectives for more examples # </RequireAny>
</Directory>
Make sure to restart the web server after doing any of the above.
service httpd restart
Alternatively, just reboot for the changes to take effect.
