[openstack-dev] [swift] [keystone] Keystone v3 API domains in Swift
David Chadwick
d.w.chadwick at kent.ac.uk
Sat Feb 2 14:54:26 UTC 2013
There is nothing wrong in principle in having access control rules based
on attributes that a subject might or might not have provided. When I go
to the cinema to see a +15 movie I might have to provide proof of age.
If I have forgotten to bring it with me, then I dont get in to see the
film. It is up to the user to provide the attributes that are required
by the service in order to gain access. If the service's policy is that
subjects need to provide email addresses, then users would know that
they need to do this in order to gain access. Services should publish
their policies to users if they are different to the expected norms.
In summary, it is for the service to decide which attributes are needed.
regards
David
On 01/02/2013 21:16, Ali, Haneef wrote:
> Do we really want swift to make ACL decision based on an attribute
> which may or may not be there( since it is optional)?
>
> Thanks
>
> Haneef
>
> *From:*Adam Young [mailto:ayoung at redhat.com]
> *Sent:* Friday, February 01, 2013 12:47 PM
> *To:* openstack-dev at lists.openstack.org
> *Subject:* Re: [openstack-dev] [swift] [keystone] Keystone v3 API
> domains in Swift
>
> On 02/01/2013 01:27 PM, Dolph Mathews wrote:
>
> It's not; we dropped it from the list of required attributes, but
> you can still provide one.
>
> According to GYee's latest submission, it would be in
>
> extra:{email:address}
>
> But we haven;t yet nailed down that proposal
>
>
>
>
>
> -Dolph
>
> On Fri, Feb 1, 2013 at 11:56 AM, Ali, Haneef <haneef.ali at hp.com
> <mailto:haneef.ali at hp.com>> wrote:
>
> Are you sure that token contains email-address? I don't see that as
> required field in user creation in v3.
>
> Thanks
> Haneef
>
>
> -----Original Message-----
> From: David Chadwick [mailto:d.w.chadwick at kent.ac.uk
> <mailto:d.w.chadwick at kent.ac.uk>]
>
> Sent: Friday, February 01, 2013 3:06 AM
> To: OpenStack Development Mailing List
> Subject: Re: [openstack-dev] [swift] [keystone] Keystone v3 API domains
> in Swift
>
> Since the token contains the email address of the user, isnt it possible
> to use this in the ACL?
>
> regards
>
> David
>
> On 23/01/2013 10:23, Alexandra Shulman-Peleg wrote:
> > Hi,
> >
> > I would like to get back to this discussion and specify the exact
> > syntax of ACLs that can be used when removing the global uniqueness
> > constraint on user names. I wander whether we really need to prefix
> > both the project_name and the username with the domain id? Especially,
> > since on ACLs we mainly need to properly identify the user and not
> the project.
> > So the notion of a project may not be required in this context? For
> > example, in NFSv4 ACLs (also adopted by CDMI) users are identified by
> > username at domain. So I wander whether on ACLs, in V3 we can simply
> > switch from tenant_id:username to domain_id:username? This seems to
> > fulfill the identification requirements and will give a very simple
> > solution for the migration of existing v2 customers to private domains
> > in V3 - assigning the new domain_id to match the old tenant_id will
> > allow preserving all of the stored containers without the need to
> > modify the containers' meta data.
> >
> > Best Regards,
> > Alex.
> >
> >
> >
> > From: "Yee, Guang" <guang.yee at hp.com <mailto:guang.yee at hp.com>>
> > To: OpenStack Development Mailing List
> > <openstack-dev at lists.openstack.org
> <mailto:openstack-dev at lists.openstack.org>>,
> > Date: 11/01/2013 10:31 PM
> > Subject: Re: [openstack-dev] [swift] [keystone] Keystone v3 API
> > domains in Swift
> > ----------------------------------------------------------------------
> > --
> >
> >
> >
> > As long as Swift URL stay the same we should be OK. Frankly, there
> > aren't any strong arguments for changing it at this point. Whenever we
> > remove the globally uniqueness constraint on names, new Swift ACLs
> > probably will need to switch over to using namespacing.
> >
> > domain_name.project_name:domain_name.username
> >
> > something like that. Existing Swift ACLs should work fine since if the
> > given domain is the default (migrated) system domain, auth_token
> > middleware should not set the domains headers.
> >
> >
> > Guang
> >
> >
> > -----Original Message-----
> > From: David Chadwick [mailto:d.w.chadwick at kent.ac.uk
> <mailto:d.w.chadwick at kent.ac.uk>]
> > Sent: Friday, January 11, 2013 8:36 AM
> > To: OpenStack Development Mailing List
> > Subject: Re: [openstack-dev] [swift] [keystone] Keystone v3 API
> > domains in Swift
> >
> > Hi Chuck
> >
> > On 11/01/2013 15:59, Chuck Thier wrote:
> > > The Tenant_ID is in the URL
> > > (https://{SWIFT_IP}/v1/AUTH_{TENANT_ID}/{CONTAINER}/{OBJECT})
> > >
> > > I think we have beaten this part to death a bit now, as we seem to
> > all > agree that we can continue this pattern with the V3 API. The
> > one > concern that I still have is how the ACLs will work, and
> > weather or > not that will need to change.
> > >
> > > I'm also curious how the Keystone V3 API will work alongside V2 apis.
> >
> > My opinion (only, I dont speak for anyone else) is as follows:
> >
> > 1. A v2 API system has no problems as it is working OK today 2. A v3
> > API system only, with domains added, should work OK tomorrow otherwise
> > the v3 API has problems 3. So the main point as you say is how do v2
> > and v3 systems interwork. I suggest there is an intercept module, say
> > in the Keystone pipeline, that knows it is operating in a v2/v3
> > environment, and when it receives a v2 request already containing a
> > tenant_ID it knows it will comprise domain:project and it can unpack
> > it, and give the separate elements to the rest of the V3 code for
> > processing as in a v3 system. When the intercept module receives a v2
> > request that needs a tenant ID returning to it, it will encode up the
> > domain and project as a tenant ID, and return this to the v2 client.
> > The v2 client will be blissfully unaware that what it thinks is a
> > tenant ID is actually a combination of domain and project.
> >
> > regards
> >
> > david
> >
> >
> >
> > >
> > > --
> > > Chuck
> > >
> > > On Thu, Jan 10, 2013 at 4:16 AM, David Chadwick
> > <d.w.chadwick at kent.ac.uk <mailto:d.w.chadwick at kent.ac.uk>>
> > wrote:
> > >> You have to ask, where does the Swift client get the tenant_Id from?
> > Isnt
> > it
> > >> Keystone? So if Keystone returns project_ID:tenant_Id to swift as
> > the >> project_id string, then Swift can continue to use this as if
> > nothing has >> changed. Its just a string whose content has no
> > meaning to Swift, but whose >> content does have meaning to Keystone.
> > The Swift policy simply needs to >> change the value of the tenant_id
> > in its policy to the new value and it >> should work the same >> >>
> > regards >> >> David >> >> >> On 09/01/2013 20:21, heckj wrote:
> > >>>
> > >>> Given that domains are a segmentation of projects/tenants, then I
> > wouldn't >>> expect to want to change it from a project_id
> > representation to anything >>> else.
> > >>>
> > >>> -joe
> > >>>
> > >>> On Jan 9, 2013, at 12:13 PM, Chuck Thier <cthier at gmail.com
> <mailto:cthier at gmail.com>> wrote:
> > >>>>
> > >>>> Things are always easy, until you start thinking about backwards
> > >>>> compatibility. The storage urls for swift with keystone are
> > currently >>>> keyed off of the tenant_id (soon to be project_id), so
> > you end up with >>>> an endpoint url that looks something like >>>>
> > http://{SWIFT_IP}/v1/AUTH_{TENANT_ID} if you change that by adding
> > >>>> the domain, then you break any current users in your system, and
> > you >>>> can't use v2 and v3 auth contracts simultaneously.
> > >>>>
> > >>>> --
> > >>>> Chuck
> > >>>>
> > >>>> On Wed, Jan 9, 2013 at 1:37 PM, David Chadwick
> > <d.w.chadwick at kent.ac.uk <mailto:d.w.chadwick at kent.ac.uk>> >>>> wrote:
> > >>>>>
> > >>>>> I would have thought that the solution is conceptually rather
> > >>>>> straightforward. If domains can have their own project names and
> > >>>>> usernames, >>>>> then you prefix the names with the domain ID
> > or domain name to make them >>>>> globally unique again.
> > >>>>>
> > >>>>> regards
> > >>>>>
> > >>>>> David
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> On 09/01/2013 19:14, Yee, Guang wrote:
> > >>>>>>
> > >>>>>>
> > >>>>>> Yes. Swift ACLs <tenant_id>:<user_name>,
> > <tenant_id>:<user_name>, and >>>>>> *:<user_name> will be impacted if
> > project (formely tenant) name and >>>>>> user >>>>>> name are no
> > longer globally unique. We'll need to figure out a >>>>>> migration
> > >>>>>> path before relaxing that constraint.
> > >>>>>>
> > >>>>>>
> > >>>>>> Guang
> > >>>>>>
> > >>>>>>
> > >>>>>> -----Original Message-----
> > >>>>>> From: Chuck Thier [mailto:cthier at gmail.com
> <mailto:cthier at gmail.com>] >>>>>> Sent:
> > Wednesday, January 09, 2013 10:48 AM >>>>>> To: OpenStack Development
> > Mailing List >>>>>> Subject: Re: [openstack-dev] [swift] [keystone]
> > Keystone v3 API domains >>>>>> in >>>>>> Swift >>>>>> >>>>>> Se
> > responses inline:
> > >>>>>>
> > >>>>>> On Wed, Jan 9, 2013 at 4:01 AM, Henry Nash
> > <henryn at linux.vnet.ibm.com <mailto:henryn at linux.vnet.ibm.com>>
> >>>>>> wrote:
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> So there are a couple of issues intertwined in this thread:
> > >>>>>>>
> > >>>>>>> 1) Uniqueness of identifiers in Swift given the keystone
> > Identity v3 >>>>>>> api.
> > >>>>>>> This is the issue of whether Swift uses tenant names (now
> > called >>>>>>> project >>>>>>> names) at all to uniquely identify
> > any objects - if it did, then it >>>>>>> would >>>>>>> need to also
> > consider storing a domain name or id. From the >>>>>>> discussion,
> > >>>>>> >>>>>> >>>>>> it >>>>>>> >>>>>>> >>>>>>> sounds like
> > tenant/project ID is used instead, which (from a >>>>>>> uniqueness
> > >>>>>>> point of view) is fine. A separate issue exists needs to be
> > discussed >>>>>>> around swift ACLs and whether username potentially
> > becoming unique >>>>>>> only >>>>>>> within a domain will have an
> > impact.
> > >>>>>>>
> > >>>>>>
> > >>>>>> For AuthN, you are correct, in that it only relies on
> > tenant/project >>>>>> ID. So, nothing has to be changed from that
> > perspective. AuthZ is a >>>>>> little more tricky. For ACLs with
> > keystone, they are set as >>>>>> TENANT:USER in any of the following
> > patterns:
> > >>>>>>
> > >>>>>> *:user_name - that user from any tenant has access >>>>>>
> > tenant_id:user_name - that user from that tenant id has access >>>>>>
> > tenant_name:user_name - that user from that tenant name has access
> > >>>>>> >>>>>> If project_name will not be unique in v3, then the
> > >>>>>> tenant_name:user_name format may have to be deprecated.
> > >>>>>>
> > >>>>>> I would be interested to hear from providers that are using
> > keystone >>>>>> with swift and hear which of the above use cases
> they are using.
> > >>>>>>
> > >>>>>>
> > >>>>>>> 2) Given that keystone identity v3 domains are likely to be
> > usually >>>>>>> used >>>>>> >>>>>> >>>>>> to >>>>>>> >>>>>>>
> > >>>>>>> represent an enterprise (or "account holder" in common cloud
> > >>>>>>> terminology) >>>>>>> and contain the collection of projects
> > owned by that enterprise, is it >>>>>>> important for Swift to have
> > that domain knowledge? Will there be >>>>>> >>>>>> >>>>>>
> > operations >>>>>>> >>>>>>> >>>>>>> either within swift (or more
> > likely layered on top of swift) that need >>>>>> >>>>>> >>>>>> that
> > >>>>>>> >>>>>>> >>>>>>> information? E.g. How would someone layer a
> > billing engine on top of >>>>>> >>>>>> >>>>>> swift >>>>>>>
> > >>>>>>> >>>>>>> that could collate all the swift containers that were
> > part of one >>>>>>> domain?
> > >>>>>>> Obviously that engine could call keystone with each
> > project_id in turn >>>>>>> and >>>>>>> find the domain_id.....but
> > that sounds pretty inefficient.
> > >>>>>>>
> > >>>>>>
> > >>>>>> As is, containers can already be collated for a given
> > tenant/project >>>>>> id. The containers for a domain is then an
> > aggregate of the project >>>>>> ids associated to that domain.
> > >>>>>>
> > >>>>>> I think the default should be that domains are not mapped in
> swift.
> > I
> > >>>>>> believe that this will also be required to facilitate
> > backwards >>>>>> compatibility, which brings up another interesting
> > question -- Is >>>>>> there an expectation that people will be able
> > to run keystone auth >>>>>> v2.0 and v3.0 side by side?
> > >>>>>>
> > >>>>>> --
> > >>>>>> Chuck
> > >>>>>>
> > >>>>>> _______________________________________________
> > >>>>>> OpenStack-dev mailing list
> > >>>>>> OpenStack-dev at lists.openstack.org
> <mailto:OpenStack-dev at lists.openstack.org> >>>>>>
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