[openstack-dev] [Keystone] State of Fernet Token deployment

Brant Knudson blk at acm.org
Mon Apr 18 14:29:38 UTC 2016

On Fri, Apr 15, 2016 at 9:04 PM, Adam Young <ayoung at redhat.com> wrote:

> We all want Fernet to be a reality.  We ain't there yet (Except for mfish
> who has no patience) but we are getting closer.  The goal is to get Fernet
> as the default token provider as soon as possible. The review to do this
> has uncovered a few details that need to be fixed before we can do this.
> Trusts for V2 tokens were not working correctly.  Relatively easy fix.
> https://review.openstack.org/#/c/278693/ Patch is still failing on Python
> 3.  The tests are kindof racy due to the revocation event 1 second
> granularity.  Some of the tests here have A sleep (1) in them still, but
> all should be using the time control aspect of the unit test fixtures.
> Some of the tests also use the same user to validate a token as that have,
> for example, a role unassigned.  These expose a problem that the revocation
> events are catching too many tokens, some of which should not be treated as
> revoked.
> Also, some of the logic for revocation checking has to change. Before, if
> a user had two roles, and had one removed, the token would be revoked.
> Now, however, the token will validate successful, but the response will
> only have the single assigned role in it.
> Python 3 tests are failing because the Fernet formatter is insisting that
> all project-ids be valid UUIDs, but some of the old tests have "FOO" and
> "BAR" as ids.  These either need to be converted to UUIDS, or the formatter
> needs to be more forgiving.
> Caching of token validations was messing with revocation checking. Tokens
> that were valid once were being reported as always valid. Thus, the current
> review  removes all caching on token validations, a change we cannot
> maintain.  Once all the test are successfully passing, we will re-introduce
> the cache, and be far more aggressive about cache invalidation.
> Tempest tests are currently failing due to Devstack not properly
> identifying Fernet as the default token provider, and creating the Fernet
> key repository.  I'm tempted to just force devstack to always create the
> directory, as a user would need it if they ever switched the token provider
> post launch anyway.
There's a review to change devstack to default to fernet:
https://review.openstack.org/#/c/195780/ . This was mostly to show that
tempest still passes with fernet configured. It uncovered a couple of test
issues (similar in nature to the revocation checking issues mentioned in
the original note) that have since been fixed.

We'd prefer to not have devstack overriding config options and instead use
keystone's defaults. The problem is if fernet is the default in keystone
then it won't work out of the box since the key database won't exist. One
option that I think we should investigate is to have keystone create the
key database on startup if it doesn't exist.

- Brant
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