[rbac][keystone][kolla][osa][tripleo][charms] RBAC in Yoga for deployment projects

Mark Goddard mark at stackhpc.com
Wed Jan 19 10:35:53 UTC 2022


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

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.

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

How does that line up with other projects' approaches? What have we missed?


[1] https://opendev.org/openstack/governance/src/branch/master/goals/selected/consistent-and-secure-rbac.rst
[2] https://opendev.org/openstack/governance/src/branch/master/goals/selected/consistent-and-secure-rbac.rst#yoga-timeline-7th-mar-2022
[3] https://opendev.org/openstack/kolla-ansible/commit/2e933dceb591c3505f35c2c1de924f3978fb81a7
[4] https://review.opendev.org/c/openstack/kolla-ansible/+/815577
[5] https://etherpad.opendev.org/p/enabling-system-scope-in-kolla-ansible

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