In case you haven't noticed, LDAP has been introduced since Aperture Data Studio v2.0.11.
Go to Settings>Security to set up the LDAP properties.
Once this is set up, you can test the connection to the ldap server. A message will be shown to indicate whether the connection is successful or has failed.
Once the connection has been set up, you can then set up a user to use LDAP authentication.
Go to System>Users. When adding a new user or editing an existing user, you should be able to select LDAP and MS Active Directory server as an authentication mechanism and enter the LDAP ID.