because there are no more updates on this thread, I tried to update the ldap-plugin from https://github.com/ianbogda/nodebb-plugin-sso-ldap
I figured out, that there was an installation problem with passport-ldap, so i changed this to passport-ldapauth and updated the admin form. Besides I take the nodebb-plugin-sso-google plugin as template to updated the library.js in the ldap-plugin.
After all the ldap-plugin can be installed but the ldap-authentication doesn't work. Anyway this is my first contact with nodejs and nodebb development and i don't know how it goes.
Maybe one of you take a look and fix this. The code can be found at https://github.com/Psych0D/nodebb-plugin-sso-ldap
I'm very interested in using nodebb but i need an ldap authentication.