Open Stack

Dear all,

I would provide both PaaS and IaaS (Openstack)  services, with two keystone
services: one for the PaaS (Keystone PaaS) and the other one for the IaaS
(Keystone IaaS).

In particular, I would Openstack system appear as a PaaS service towards
PaaS's users, so that an user that authenticates against Keystone PaaS can
use Openstack services too.

So, I was thinking of using Keystones federation, so that:
1- PaaS's user authenticates against Keystone PaaS and receives a scoped
token.
2- PaaS's user invokes openstack services by using the scoped token
received from Keystone PaaS;
3- Openstack services validate the token against Keystone IaaS;
4- Keystone IaaS validate against Keystone PaaS

Do you think this scenario is possible? I would be appreciate any further
solutions you think I might implement.

Best regards,
Giuseppe
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