You can set up mod_authnz_fcgi module to work with FastCGI authorizer applications to authenticate users and authorize access to resources. It supports generic FastCGI authorizers that participate in a single phase for authentication and authorization, and Apache httpd-specific authenticators and authorizers. FastCGI authorizers can authenticate using the user id and password for basic authentication or authenticate using arbitrary mechanisms.
For more information on using mod_authnz_fcgi, see http://httpd.apache.org/docs/trunk/mod/mod_authnz_fcgi.html.