[ovs-discuss] OVN RBAC role for ovn-northd?

Frode Nordahl frode.nordahl at canonical.com
Thu Nov 7 21:59:50 UTC 2019


fwiw; I proposed this small note earlier this evening:
https://github.com/ovn-org/ovn/pull/25

tor. 7. nov. 2019, 21:47 skrev Ben Pfaff <blp at ovn.org>:

> Sure, anything helps.
>
> On Thu, Nov 07, 2019 at 12:27:44PM -0800, aginwala wrote:
> > Hi Ben:
> >
> > It seems RBAC doc
> >
> http://docs.openvswitch.org/en/stable/tutorials/ovn-rbac/#configuring-rbac
> > only talks
> > about chassis and not mentioning about northd. I can submit a patch to
> > update that as a todo for northd and mention the workaround until we add
> > formal support. Is that ok?
> >
> >
> >
> >
> > On Thu, Nov 7, 2019 at 12:14 PM Ben Pfaff <blp at ovn.org> wrote:
> >
> > > Have we documented this?  Should we?
> > >
> > > On Thu, Nov 07, 2019 at 10:20:22AM -0800, aginwala wrote:
> > > > Hi:
> > > >
> > > > It is a known fact and have-been discussed before. We use the same
> > > > workaround as you mentioned. Alternatively, you can also set role=""
> and
> > > it
> > > > will work for both northd and ovn-controller instead of separate
> > > listeners
> > > > which is also a security loop-hole. In short, some work is needed
> here
> > > > to handle rbac for northd.
> > > >
> > > > On Thu, Nov 7, 2019 at 9:47 AM Frode Nordahl <
> > > frode.nordahl at canonical.com>
> > > > wrote:
> > > >
> > > > > Hello all,
> > > > >
> > > > > TL;DR; When enabling the `ovn-controller` role on the SB DB
> > > `ovsdb-server`
> > > > > listener, `ovn-northd` no longer has the necessary access to do
> its job
> > > > > when you are unable to use the local unix socket for its
> connection to
> > > the
> > > > > database.
> > > > >
> > > > > AFAICT there is no northd-specifc or admin type role available,
> have I
> > > > > missed something?
> > > > >
> > > > > I have worked around the issue by enabling a separate listener on a
> > > > > different port on the Southbound ovsdb-servers so that
> `ovn-northd` can
> > > > > connect to that.
> > > > >
> > > > >
> > > > > I have a OVN deployment with central components spread across three
> > > > > machines, there is an instance of the Northbound and Southbound
> > > > > `ovsdb-server` on each of them which are clustered, and there is
> also
> > > an
> > > > > instance of `ovn-northd` on each of them.
> > > > >
> > > > > The deployment is TLS-enabled and I have enabled RBAC.
> > > > >
> > > > > Since the DBs are clustered I have no control of which machine
> will be
> > > the
> > > > > leader, and it may be that one machine has the leader for the
> > > Northbound DB
> > > > > and a different machine has the leader of the Southbound DB.
> > > > >
> > > > > Because of this ovn-northd is unable to talk to the databases
> through a
> > > > > local unix socket and must use a TLS-enabled connection to the
> DBs, and
> > > > > herein lies the problem.
> > > > >
> > > > >
> > > > > I peeked at the RBAC implementation, and it appears to me that the
> > > > > permission system is tied to having specific columns in each table
> that
> > > > > maps to the name of the client that wants permission.  On the
> surface
> > > this
> > > > > appears to not fit with `ovn-northd`'s needs as I would think it
> would
> > > need
> > > > > full access to all tables perhaps based on a centrally managed set
> of
> > > > > hostnames.
> > > > >
> > > > > --
> > > > > Frode Nordahl
> > > > >
> > > > > _______________________________________________
> > > > > discuss mailing list
> > > > > discuss at openvswitch.org
> > > > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
> > > > >
> > >
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> > >
> > >
>
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