---- On Thu, 20 Jan 2022 13:36:53 -0600 Mark Goddard <mark@stackhpc.com> wrote ----
On Thu, 20 Jan 2022 at 18:40, Ghanshyam Mann <gmann@ghanshyammann.com> wrote:
---- On Thu, 20 Jan 2022 03:35:33 -0600 Mark Goddard <mark@stackhpc.com> wrote ----
On Wed, 19 Jan 2022 at 16:12, Ghanshyam Mann <gmann@ghanshyammann.com> wrote:
---- On Wed, 19 Jan 2022 04:35:53 -0600 Mark Goddard <mark@stackhpc.com> wrote ----
Hi,
If you haven't been paying close attention, it would be easy to miss some of the upcoming RBAC changes which will have an impact on deployment projects. I thought I'd start a thread so that we can share how we are approaching this, get answers to open questions, and ideally all end up with a fairly consistent approach.
The secure RBAC work has a long history, and continues to evolve. According to [1], we should start to see some fairly substantial changes over the next few releases. That spec is fairly long, but worth a read.
In the yoga timeline [2], there is one change in particular that has an impact on deployment projects, "3. Keystone enforces scope by default". After this change, all of the deprecated policies that many still rely on in Keystone will be removed.
In kolla-ansible, we have an etherpad [5] with some notes, questions and half-baked plans. We made some changes in Xena [3] to use system scope in some places when interacting with system APIs in Ansible tasks.
The next change we have staged is to add the service role to all service users [4], in preparation for [2].
Question: should the role be added with system scope or in the existing service project? The obvious main use for this is token validation, which seems to allow system or project scope.
We anticipate that some service users may still require some project-scoped roles, e.g. when creating resources for octavia. We'll deal with those on a case by case basis.
Service roles are planned for phase2 which is Z release[1]. The Idea here is service to service communication will happen with 'service' role (which keystone need to implement yet) and end users will keep using the what ever role is default (or overridden in policy file) which can be project or system scoped depends on the APIs.
So at the end service-service APIs policy default will looks like
'(role:admin and system:network and project_id:%(project_id)s) or (role:service and project_name:service)'
Say nova will use that service role to communicate to cinder and cinder policy will pass as service role is in OR in default policy.
But let's see how they are going to be and if any challenges when we will implement it in Z cycle.
I'm not 100% on our reasoning for using the service role in yoga (I wasn't in the discussion when we made the switch, although John Garbutt was), although I can provide at least one reason.
Currently, we have a bunch of service users doing things like keystone token validation using the admin role in the service project. If we enforce scopes & new defaults in keystone, this will no longer work, due to the default policy:
identity:validate_token: (role:reader and system_scope:all) or rule:service_role or rule:token_subject
Now we could go and assign system-reader to all these users, but if the end goal is to give them all the service role, and that allows token validation, then to me that seems like a better path.
Currently, we're creating the service role during deploy & upgrade, then assigning it to users. Keystone is supposed to create the service role in yoga, so we can eventually drop that part.
Does this seem reasonable? Is keystone still on track to create the service role in yoga?
I think this is a reasonable plan and once we have service roles implemented in keystone as well as in all the services to request other service APIs then deployment project (Kolla here) can update them from system_reader to actual service role.
To be clear, I am proposing to skip system-reader, and go straight to the service role in yoga.
But that would not be doable until services implement service roles which is Yoga cycle target for keystone and Z cyle target for other projects. Or you mean to re-consider to target the service role for all projects also in Yoga so that deployment projects can go with service role directly? -gmann
And yes that can be done for token validation as well as the service-to-service API calls for example nova to cinder or neutron to nova APIs call. I do not think we can migrate everything (service tokens) together for all the services in deployment projects until all these services are ready with the 'service' role implementation (implementation means changing their default roles to add 'service' role for service-to-service APIs).
Regarding the keystone track on service role work in Yoga or not, I do not have clear answer may be Lance or keystone team can answer it. But Lance has spec up[1] but not yet merged.
[1] https://review.opendev.org/c/openstack/keystone-specs/+/818616
-gmann
In anticipation of keystone setting enforce_scope=True and removing old default policies (which I assume effectively removes enforce_new_defaults?), we will set this in kolla-ansible, and try to deal with any fallout. Hopefully the previous work will make this minimal.
How does that line up with other projects' approaches? What have we missed?
Yeah, we want users/deployment projects/horizon etc to use the new policy from keystone as first and we will see feedback how they are (good, bad, really bad) from usage perspective. Why we choose keystone is, because new policy are there since many cycle and ready to use. Other projects needs to work their policy as per new SRBAC design/direction (for example nova needs to modify their policy before we ask users to use new policy and work is under progress[2]).
I think trying in kolla will be good way to know if we can move to keystone's new policy completely in yoga.
We have a scope-enforcing preview patch [1], and it's passing our base set of tests. I have another that triggers all of the jobs.
[1] https://review.opendev.org/c/openstack/kolla-ansible/+/825406
[1] https://opendev.org/openstack/governance/src/branch/master/goals/selected/co... [2] https://blueprints.launchpad.net/nova/+spec/policy-defaults-refresh-2
-gmann
Mark
[1] https://opendev.org/openstack/governance/src/branch/master/goals/selected/co... [2] https://opendev.org/openstack/governance/src/branch/master/goals/selected/co... [3] https://opendev.org/openstack/kolla-ansible/commit/2e933dceb591c3505f35c2c1d... [4] https://review.opendev.org/c/openstack/kolla-ansible/+/815577 [5] https://etherpad.opendev.org/p/enabling-system-scope-in-kolla-ansible