Run ASP.net Identity as a WCF Service

We are currently in the process of building a new MVC application and I am looking at authentication.
Our security policy is such that we cannot permit a website to access the databases directly instead all requests must go through a service layer. ASP.net identity accesses the database through EF to the database directly. Is there a simple way to enable a WCF service to handle these calls and sit between the MVC app and the identity database.
Thanks
Don