[openstack-dev] [keystone][barbican] Regarding exposing X-Group-xxxx in token validation

Dolph Mathews dolph.mathews at gmail.com
Thu Jun 4 01:44:08 UTC 2015

On Wed, Jun 3, 2015 at 5:58 PM, John Wood <john.wood at rackspace.com> wrote:

>  Hello folks,
>  There has been discussion about adding user group support to the
> per-secret access control list (ACL) feature in Barbican. Hence secrets
> could be marked as accessible by a group on the ACL rather than an
> individual user as implemented now.
>  Our understanding is that Keystone does not pass along a user’s group
> information during token validation however (such as in the form of
> X-Group-Ids/X-Group-Names headers passed along via Keystone middleware).

The pre-requisite for including that information in the form of headers
would be adding group information to the token validation response. In the
case of UUID, it would be pre-computed and stored in the DB at token
creation time. In the case of PKI, it would be encoded into the PKI token
and further bloat PKI tokens. And in the case of Fernet, it would be
included at token validation time.

Including group information, however, would also let us efficient revoke
tokens using token revocation events when group membership is affected in
any way (user being removed from a group, a group being deleted, or a
group-based role assignment being revoked). The OS-FEDERATION extension is
actually already including groups in tokens today, as a required part of
the federated workflow. We'd effectively be introducing that same behavior
into the core Identity API (see the federated token example):


This would allow us to address bugs such as:


In the past, we shied away from including groups if only to avoid bloating
the size of PKI tokens any further (but now we have Fernet tokens providing
a viable alternative). Are there any other reasons not to add group
information to the token validation response?

>  Would the community consider this a useful feature? Would the community
> consider adding this support to Liberty?
>  Thank you,
> John
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