[openstack-dev] [Magnum] TLS Support in Magnum

Adrian Otto adrian.otto at rackspace.com
Mon Jun 15 06:09:39 UTC 2015


On Jun 14, 2015, at 10:30 PM, Madhuri Rai <madhuri.rai07 at gmail.com<mailto:madhuri.rai07 at gmail.com>> wrote:

Hi All,

This is to bring the blueprint  secure-kubernetes<https://blueprints.launchpad.net/magnum/+spec/secure-kubernetes> in discussion. I have been trying to figure out what could be the possible change area to support this feature in Magnum. Below is just a rough idea on how to proceed further on it.

This task can be further broken in smaller pieces.

1. Add support for TLS in python-k8sclient.
The current auto-generated code doesn't support TLS. So this work will be to add TLS support in kubernetes python APIs.

2. Add support for Barbican in Magnum.
Barbican will be used to store all the keys and certificates.

Keep in mind that not all clouds will support Barbican yet, so this approach could impair adoption of Magnum until Barbican is universally supported. It might be worth considering a solution that would generate all keys on the client, and copy them to the Bay master for communication with other Bay nodes. This is less secure than using Barbican, but would allow for use of Magnum before Barbican is adopted.

If both methods were supported, the Barbican method should be the default, and we should put warning messages in the config file so that when the administrator relaxes the setting to use the non-Barbican configuration he/she is made aware that it requires a less secure mode of operation.

My suggestion is to completely implement the Barbican support first, and follow up that implementation with a non-Barbican option as a second iteration for the feature.

Another possibility would be for Magnum to use its own private installation of Barbican in cases where it is not available in the service catalog. I dislike this option because it creates an operational burden for maintaining the private Barbican service, and additional complexities with securing it.

3. Add support of TLS in Magnum.
This work mainly involves supporting the use of key and certificates in magnum to support TLS.

The user generates the keys, certificates and store them in Barbican. Now there is two way to access these keys while creating a bay.

Rather than "the user generates the keys…", perhaps it might be better to word that as "the magnum client library code generates the keys for the user…”.

1. Heat will access Barbican directly.
While creating bay, the user will provide this key and heat templates will fetch this key from Barbican.

I think you mean that Heat will use the Barbican key to fetch the TLS key for accessing the native API service running on the Bay.

2. Magnum-conductor access Barbican.
While creating bay, the user will provide this key and then Magnum-conductor will fetch this key from Barbican and provide this key to heat.

Then heat will copy this files on kubernetes master node. Then bay will use this key to start a Kubernetes services signed with these keys.

Make sure that the Barbican keys used by Heat and magnum-conductor to store the various TLS certificates/keys are unique per tenant and per bay, and are not shared among multiple tenants. We don’t want it to ever be possible to trick Magnum into revealing secrets belonging to other tenants.

After discussion when we all come to same point, I will create separate blueprints for each task.
I am currently working on configuring Kubernetes services with TLS keys.

Please provide your suggestions if any.

Thanks for kicking off this discussion.



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