I'm working on a Rails 2 app (I know it's pretty old), but that's what they are working on. I need a working approach to use AD authentication in the app.
Seems like I could do it with 'devise_ldap_authenticatable' gem, but they aren't using Devise for authentication.
I used a much simpler method using this gem (https://github.com/ruby-ldap/ruby-net-ldap), and a great tutorial is here: http://net-ldap.rubyforge.org/Net/LDAP.html