Add Key rotation policy.

[MohamedSalah9972]

Key Rotation Policy

Definitions

• Rotation Period: The duration after which a key is rotated.
• Grace Period: The time after the rotation period during which the key will still be returned.

New Properties

• Expiry: Private keys will have a new property expiry. This is an indication for clients and can be used to:
  • Clean caches.
  • Test the functionality.

Enforcement

• Expiring Keys: Enforced in unwrapKey.
  • The key can expire between calling the key and unwrapKey.
  • From a client perspective, it is more logical to handle expired keys only when calling unwrapKey where is needs to be done anyway.
  • Allow for clients to build monitoring to spot the key expired event ASAP

TODO

• Create an endpoint to return the key rotation policy.
• Enforce key rotation policy in public keys.

[beejones]

We now have a new end to end testing framework. This is perfect for this. Have a look to e.g.
test_keyReleasePolicy.py
You could change policies and test the key expiry case

[beejones]

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[MohamedSalah9972]

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[kapilvgit]

It is useful to log the timestamp in the ledger even if we are getting from the host. It allows auditors to detect misbehavior.

[beejones]

The timestamp and expiry are in the KeyItem stored on the ledger

[kapilvgit]

This seems very low for default. One day with a grace period of a few hours e.g., 6 hours sounds more reasonable?

[beejones]

this is currently only used in tests. If the consortium does not apply the policy, no key rotation policy will be active as at this moment.
If we want to make this more as a policy example, shouldn't we use something like six months. We should of course use a lower value for testing first.

[MohamedSalah9972]

Hi @beejones, we agreed here that the expiry date should be calculated on the fly

[beejones]

We still calculate it on the fly. Expiry can be used by clients to remove the key from their cache and go back to kms.
It is also very useful for testing the expiry feature in our E2E tests.

[kapilvgit]

keyItem is not a parameter