As the title says, is there any way to make a SSO plugin using our forum data?
Unfortunately I don't believe so. There's no plugin that lets NodeBB be an OAuth 2.0 provider at this time. It's low priority for us 
You could contact us to fund development if you're interested?
I'm developer, all I need to do is to add new functions to our product even though it is non-profit. If I were successful business man, I would help us doing that.
But, on put it in another way, every forum using NodeBB has its users and their user data-structure are easy to read in another NodeBB based forum, that is to say, to share forum users is feasible. Secondly, sharing user data can obviously enlarge users to the forum maintainers and thus improves the statistics on each forum. Thirdly, there will be more forums willing to cooperate with NodeBB and other NodeBB based forum to gain exposure. All in all, it is worth implementing this.
What is the main concern on it? Is it difficult to finish a OAuth 2 strategy based on NodeBB? or there would be a great change on data structure if you were to implement this? or you don't have much time to do that? Any technical problems can share to us.
@julian: Is there any update on this? Our plan is to use Nodebb user database for my rocket chat app log ins and registrations. We have seen few of the methods:
Thanks
Nonetheless, I've seen it supports login in with favebook, twitter and the like... so I gues it does support Oauth2 strategies, right?
@tayyaba @Chlorophyll Oh yes, NodeBB supports OAuth2 strategies, but does not act as a provider at this time
@julian Thanks for the update 
