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Verifying ESS releases against Cosign

Cosign ESS Verification Key

ESS does not use Cosign transaction log to be able to support airgapped deployment. We are instead relying on a public key that you can ask if you need to run image verification in your cluster.

The ESS Cosign public key is the following one :

-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE1Lc+7BqkqD+0XYft05CeXto/Ga1Y
DKNk3o48PIJ2JMrq3mzw13/m5rzlGjdgJCs6yctf4+UdACZx5WSiIWTFbQ==
-----END PUBLIC KEY-----

Verifying manually

To verify a container against ESS Keys, you will have to run the following command :

  • Operator : cosign verify registry.gitlab.element.io/engineering/ess/operator/element-kubernetes-operator:<version> --key cosign.pub --insecure-ignore-tlog=true
  • Updater : cosign verify registry.gitlab.element.io/engineering/ess/operator/element-kubernetes-updater:<version> --key cosign.pub --insecure-ignore-tlog=true

Verifying automatically

You will have to setup and configure your SIGStore Admission Policy to use ESS Public Key.

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