Kerberos Module for Apache

Mod_auth_kerb is an Apache module designed to provide Kerberos
authentication to the Apache web server. Using the Basic Auth mechanism,
it retrieves a username/password pair from the browser and checks them
against a Kerberos server as set up by your particular organization. The
module also supports the Negotiate authentication method, which performs
full Kerberos authentication based on ticket exchanges, and does not
require users to insert their passwords to the browser.