Are you authenticating your users with LDAP on the front-end? Apache?
You can list users from the command line with the "session list" command:
You also have to authorize the users by granting them permissions using the TracAdmin tool or the permissions admin page.
Users are often managed using TracAccountManager, but I don't know which of the LDAP integration plugins are usable:
Maybe this one:
This can be really tricky though if you continue to authenticate on the front-end. In that case, TracAccountManager is just a view of the list of users. This is in contrast to delegating authentication to the plugin.
I don't know of a cookbook to make all this work, so it might require a lot of trial and error, unless someone here can post some guidance.
Ryan