Using Barbican as secret backend

https://blueprints.launchpad.net/heat/+spec/barbican-as-secret-backend

We store some secret data in the Heat database using a simple symmetric encryption with a static key. To improve security of the storage, we should optionally support using Barbican to store those secrets.

Problem description

Heat uses a simple encrypt mechanism to store secret data in its database, with the key specified in the configuration. While it provides some security, a compromised Heat node will give the attacker access to all the users’ secrets.

Proposed change

Add a new flag to the Heat configuration specifying that Barbican must be used for storing secret. When set, Heat will query the service catalog for the Barbican service, and will store the secrets in the user project, with predictable prefixes.

We already support 2 different methods of decryption, ‘heat’ being the legacy one, and ‘oslo_v1’ being the current version. Current values encrypted using those methods will keep getting decrypted the same way. When we use Barbican, the encryption method will be set to ‘barbican_v1’ and the value will be the reference of the secret.

It should require a refactoring, as data encryption is today managed at the SQLAlchemy data layer, whereas it may be easier to manage it above, especially as we need user credentials to talk to Barbican.

Alternatives

There seems to be an effort to create a key management shim that may use local secure storage as an option. We may want to wait for that effort.

Implementation

Assignee(s)

Primary assignee:
therve

Milestones

Target Milestone for completion:
Kilo-2

Work Items

  • Extract encryption management from the SQLAlchemy layer
  • Move Barbican client out of contrib
  • Add a configuration option to send secrets to the Barbican service

Dependencies

None

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