On 8/30/2016 4:36 PM, Michael Still wrote:
Sorry for being slow on this one, I've been pulled into some internal
things at work.
So... Talking to Matt Riedemann just now, it seems like we should
continue to pass through the user authentication details when we have
them to the plugin. The problem is what to do in the case where we do
not (which is mostly going to be when the instance itself makes a
metadata request).
I think what you're saying though is that the middleware wont let any
requests through if they have no auth details? Is that correct?
Michael
On Fri, Aug 26, 2016 at 12:46 PM, Adam Young <ayo...@redhat.com
<mailto:ayo...@redhat.com>> wrote:
On 08/22/2016 11:11 AM, Rob Crittenden wrote:
Adam Young wrote:
On 08/15/2016 05:10 PM, Rob Crittenden wrote:
Review https://review.openstack.org/#/c/317739/
<https://review.openstack.org/#/c/317739/> added a new
dynamic
metadata handler to nova. The basic jist is that rather
than serving
metadata statically, it can be done dyamically, so that
certain values
aren't provided until they are needed, mostly for
security purposes
(like credentials to enroll in an AD domain). The
metadata is
configured as URLs to a REST service.
Very little is passed into the REST call, mostly UUIDs
of the
instance, image, etc. to ensure a stable API. What this
means though
is that the REST service may need to make calls into
nova or glance to
get information, like looking up the image metadata in
glance.
Currently the dynamic metadata handler _can_ generate
auth headers if
an authenticated request is made to it, but consider
that a common use
case is fetching metadata from within an instance using
something like:
% curl
http://169.254.169.254/openstack/2016-10-06/vendor_data2.json
<http://169.254.169.254/openstack/2016-10-06/vendor_data2.json>
This will come into the nova metadata service
unauthenticated.
So a few questions:
1. Is it possible to configure paste (I'm a relative
newbie) both
authenticated and unauthenticated requests are accepted
such that IF
an authenticated request comes it, those credentials can
be used,
otherwise fall back to something else?
Only if they are on different URLs, I think. Its auth_token
middleware
for all services but Keystone. Keystone, the rles are
similar, but the
implementation is a little different.
Ok. I'm fine with the unauthenticated path if the service we can
just create a separate service user for it.
2. If an unauthenticated request comes in, how best to
obtain a token
to use? Is it best to create a service user for the REST
services
(perhaps several), use a shared user, something else?
No unauthenticated requests, please. If the call is to
Keystone, we
could use the X509 Tokenless approach, but if the call comes
from the
new server, you won't have a cert by the time you need to
make the call,
will you?
Not sure which cert you're referring too but yeah, the metadata
service is unauthenticated. The requests can come in from the
instance which has no credentials (via http://169.254.169.254/).
Shared service users are probably your best bet. We can
limit the roles
that they get. What are these calls you need to make?
To glance for image metadata, Keystone for project information
and nova for instance information. The REST call passes in
various UUIDs for these so they need to be dereferenced. There
is no guarantee that these would be called in all cases but it
is a possibility.
rob
I guess if config_drive is True then this isn't really a
problem as
the metadata will be there in the instance already.
thanks
rob
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Sounded like you had this sorted. True?
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I think in the case of the initial boot we want all of the virt drivers
to be passing the auth details to the external vendor data provider at a
minimum in case that's going to block requests with no auth headers.
Otherwise that means when we release newton that only works for the
libvirt driver. That's being fixed for the other virt drivers here:
https://review.openstack.org/#/c/348066/
If the instance itself can't get updated information from the metadata
service because it doesn't have the auth details, and nova isn't making
an authenticated request on it's behalf with a service user, then I
don't see that as being any worse off than the config drive case where
you get the data on initial boot and it doesn't change. It's not great,
but it's not something we have to hold this up for as we're 2 days away
from feature freeze.
So I think we should get https://review.openstack.org/#/c/348066/ merged
for Newton and work on what to do about unauthenticated requests from
the instance as a future enhancement.
--
Thanks,
Matt Riedemann
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