OpenID Logout Not Implemented

[jskillen]

• [X ] The issue is present in the latest release.
• [X ] I have searched the issues of this repository and believe that this is not a duplicate.

What happened?

Created OpenID integration with Auth0. Login integration works. Logging out does not seem to clear the data from the session and redirect the user to the Auth0 logout endpoint. Consequently the user is not challenged with credentials after logging out.

What did you expect?

When I return to the system after logging out I should be forced to log back in.

Steps to reproduce this issue

Steps:

1. Implement the OpenID connector using Auth0.
2. Log in to Chirpstack and use Auth0 to log in.
3. Log out of Chirpstack.
4. Log back in. Observe that the Auth0 login immediately redirects to Chirpstack without challenging the user for credentials.

Your Environment

ChirpStack Application Server 3.11.1

[brocaar]

I think this depends on coreos/go-oidc#226 to get merged in as this is the library I'm using for OIDC support.

[brocaar]

@jskillen the above change makes it possible to configure a logout_url endpoint.

[jskillen]

Thanks @brocaar !