Allow IP address without authentication

Question

I have set up a site that is currently work in progress. I'm using an external SMS gateway that needs access to a script on my server. However, I have set up a basic username and password authentication for regular users, but the SMS gateway can't get through that.

How can I allow a single IP to pass through the authentication without authenticating itself, and deny all other users that aren't authenticated?

Here's my .htaccess file:

Order allow,deny Allow from all AuthType Basic AuthUserFile /www/.site_htpasswd AuthName "Protected Area" require user admin 

Answer 1

Just found out, with help from JoseK:

Order deny,allow Deny from all AuthType Basic AuthUserFile /www/.site_htpasswd AuthName "Protected Area" require valid-user Allow from 1.2.3.4 Satisfy Any 

Answer 2

UPDATE: As of Apache 2.4, Order, Allow, Deny, and Satisfy directives should not be used anymore. So the new syntax is:

AuthType Basic AuthUserFile /www/.site_htpasswd AuthName "Protected Area"  <RequireAny>     Require ip 1.2.3.4     Require valid-user </RequireAny>