To authenticate users to MS Active Directory both the LDAP interface and the Kerberos interface can be used. See the relevant sections in this manual for more details:
The advantage of configuring SPNEGO is that users that are logged in to the AD domain will be logged in automatically at CAS, without any interaction asking for the password yet again. Note that this may not be desirable.
Example Configuration for FastBind and Active Directory
The example uses something called User Principal Name (UPN) in filter. The full Distinguished Name (DN) was CN=LastName\,