I've seen some issues here that could be solved by using meteor package: https://atmospherejs.com/meteor/accounts-base.

I will list the related issues that I believe could benefit from it:

#120
#119
#212

Other related packages that can provide the "Enterprise grade authentication":
https://github.com/typ90/meteor-accounts-ldap (authenticate agains ldap)
https://atmospherejs.com/meteor/accounts-google (authenticate in a google apps domain organization)
https://atmospherejs.com/meteor/accounts-github (authenticate in a github organization)
https://atmospherejs.com/meteor/accounts-oauth (maybe useful for gitlab)