[nova] [ops] user_id based policy enforcement

Ghanshyam Mann gmann at ghanshyammann.com
Wed Jun 3 17:18:26 UTC 2020

 ---- On Wed, 03 Jun 2020 11:17:41 -0500 Massimo Sgaravatto <massimo.sgaravatto at gmail.com> wrote ----
 > Thank you !
 > The "destructive actions" I guess are the ones listed here:
 > https://specs.openstack.org/openstack/nova-specs/specs/newton/implemented/user-id-based-policy-enforcement.html
 > In this page there is also the link to the ML thread you were talking about
 > So the user_id based policy enforcement for those destructive actions is supposed to work till Train ? Did I get it right ?

Yes, that is the exact list we kept the user_id restriction support for backword compatilbity. They will keep running till Ussuri for sure.
Please ntoe, we might cleanup those in Victoria cycle in favor of new defaults.


 > Thanks, Massimo
 > On Wed, Jun 3, 2020 at 3:53 PM Ghanshyam Mann <gmann at ghanshyammann.com> wrote:
 >  ---- On Wed, 03 Jun 2020 01:18:41 -0500 Massimo Sgaravatto <massimo.sgaravatto at gmail.com> wrote ----
 >  > Hi
 >  > In my Rocky installation I am preventing users from deleting instances created by other users of the same project.This was implemented setting in the nova policy file:
 >  > 
 >  > "os_compute_api:servers:delete": "rule:admin_api or user_id:%(user_id)s"
 >  > 
 >  > This works, even if in the nova log file I see:
 >  > The user_id attribute isn't supported in the rule 'os_compute_api:servers:delete'. All the user_id based policy enforcement will be removed in the future.
 >  > 
 >  > Now I would also like preventing user to see the console log file of instances created by other users. I set in the nova policy file:
 >  > "os_compute_api:os-console-output" : "rule:admin_api or user_id:%(user_id)s"
 > Nova does not restrict the policy by user_id except keypairs API or a few of the destructive actions( which I think we supported for backwards compatiblity and
 > intent to remove it later that is why you can see the warning).  I remember we discussed this in 2016 but I could not find the ML thread for that but
 > the consensus that time was we do not intend to support user_id based restriction permission in the API.
 > On the same note,  ussuri onwards you can enforce some user-level restriction based on the role, but not by user_id. In the Ussuri cycle, we have implemented
 > the keystone new defaults roles in nova policy. You can assign read and write roles for users and achieve the user's isolation within same project. 
 > Please refer this doc to know more details on those new policies
 > - https://docs.openstack.org/nova/latest/configuration/policy-concepts.html
 > -gmann
 >  > 
 >  > but this doesn't work
 >  > Any hints ?
 >  > More in general: were the user_id based policy eventually removed in latest OpenStack releases ?Which are then the  possible alternatives to implement my use case ?
 >  > Thanks, Massimo

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