Not sure that AuthZ has to be federated.  If AuthN can return a list of 
meaningful groups (something akin to roles) to AuthZ, we can isolate AuthZ to a 
given deployment.  So we can have a set of standard groups defined, and if 
Alice's AuthN returns one of those groups, she can launch.  It means we will 
probably have to define some sort of openstack-compatible authn groups.

Vish
 
On Mar 30, 2011, at 12:44 PM, Sandy Walsh wrote:

> From: Jon Slenk [jsl...@internap.com]
> 
>> I think that if the system used capabilities/ZBAC then there would be
> no such weird prompting.
> 
> I see your point, but I'm assuming AuthZ has to be federated as well. We 
> don't know about Alice, she lives in her private cloud. We have to ask her 
> AuthZ system if she can boot a new instance. 
> 
> This flow is saying "The AuthZ resource lives on your side of the fence and 
> I'd like to access it", but to do so Alice needs to grant permission and that 
> interaction seems confusing to me.
> 
> -S
> 
> PS> appreciate the feedback!
> 
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