[keycloak-user] Log out server sessions when using bearer authentication

[Dan Østerberg]

Thanx for the reply. But wouldn’t that be a bit against the whole point with token based authentication? We’ve used Jasig CAS before, and thereby used internal server-only authentication + server session. That’s very similar to Keycloak used the way you describe – and limiting in several ways. If that was the only option, we would have stayed with CAS. Being stateless & having more control in the client is certainly beneficial in a client-heavy REST-based application, where the client accesses multiple webapps (within the same realm).

I guess we’ll just have to implement some in-house solution then...

~Dan

Fra: Stian Thorgersen [mailto:sthorger at redhat.com]
Sendt: mandag 2. januar 2017 15.16
Til: Dan Østerberg <dan at ren.no>
Kopi: keycloak-user at lists.jboss.org
Emne: Re: [keycloak-user] Log out server sessions when using bearer authentication

There's no standard way of doing backchannel logout with OAuth2. There's a draft spec for OpenID Connect that we may implement in the future.

Keycloak has it's own proprietary backchannel logout, but that's only for applications that do the login. In your case as it's a JS app that obtains the tokens there's no backchannel logout involved and instead it relies on the session cookie + access token timeout. Assuming your JEE app is a rest service it should create a session that allows invoking without a access token from the JS app. That way it won't be possible for the JS app to invoke it once the session is logged out as it won't be able to obtain new access tokens.

On 29 December 2016 at 11:27, Dan Østerberg <dan at ren.no<mailto:dan at ren.no>> wrote:
Hi,

How can we make single sign out work when passing bearer tokens to a server guarded by a «traditional» session based Oauth2 client / adapter?

Lets say we use bearer authentication via the Javascript adapter, and make REST requests to a stateless (no session) server. Lets further say that during some later request, a server session will be created – either intentionally to store state, or unintentionally e.g. by some shared code (since sessions are auto-created in Java EE). Now single sign out won’t work, because Keycloak is neither aware of the server session nor the Oauth2 client that has an admin URL.

One solution could be to detect the creation of a session, and internally via an extended REST API tell the Keycloak server to create a session also for the client with admin URL (connecting it to the created session ID). But it just sounds as if this should be covered out-of-the-box, so maybe I’m just missing or misunderstanding something...

~Dan
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