[tripa]

I'm fine with permissions. Heck, it's what I already say.

Login, no, just no.

Login is ambiguous to begin with, is it the action or the user identifier?

Login as the process of logging in, the best interpretation, is still pretty limited: authentication is the validation of a much longer chain of events than that. It may start with login, but it lasts for as long as the service accepts to believe such principal is behind such actions.

Login as username is IMHO the most common use of the word, and most obviously the wrong one to mean authentication.

To make things me interesting, auth already means authentication to me. I accept it can lead to confusion and a better substitute would be welcome.