Change:
// GroupsClaim, if specified, causes the OIDCAuthenticator to try to populate the user's // groups with a ID Token field. If the GrouppClaim field is present in a ID Token the value <del> // must be a list of strings. </del> <ins> // must be a string or list of strings. </ins> GroupsClaim string }

Discussion:
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): Linux localhost 4.7.0-coreos SMP Wed Jul 27 07:30:04 UTC 2016 x8664 Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz GenuineIntel GNU/Linux Install tools: Vagrant Others: What happened: The claim named in --oidc-groups-claim MUST be list of strings, even if there is only one value. Talking to this is by design since its assumed that users will have more then one group. What you expected to happen: The OIDC authenticator should accept either a list of strings or a single string since: There is no concept of schema that marks an attribute as single value or multi value in JSON or a JWT There is no standard for representing groups in a JWT There is no standard for representing groups in OIDC An OIDC should be flexible in how it accepts data. How to reproduce it (as minimally and precisely as possible): Deploy with RBAC enabled Create a role binding for the group "admin" Generate a JWT such as the one that does NOT work below User won't be able to login Generate a JWT where the role is multi-value User will be authorized Does NOT Work: DOES Work: Anything else do we need to know:
These should be called groups, not roles, right? Those are different. And, is it normal for a JWT to contain keys which are arrays? That seems weird.
where do you see role defined? you mean the user_role claim?
Claims can be structured, yes. The name of the groups claim is arbitrary. Could easily have been "group". In my mind, this is all about enabling mapping a "groupish" claim from whatever IDP issued the JWT, even if it is a single value instead of an array.
That's the way it works currently. Yeah I'm fine with this.
Okay.