Release v0.1.0

Release Notes Confidential Containers v0.1.0

This is the first full release of Confidential Containers. The goal of this release is to provide a stable, simple, and well-documented base for the Confidential Containers project. The Confidential Containers operator is the focal point of the release. The operator allows users to install Confidential Containers on an existing Kubernetes cluster. This release also provides core Confidential Containers features, such as being able to run encrypted containers on Intel-TDX and AMD-SEV.

Please see the quickstart guide for details on how to try out Confidential Containers"

Hardware Support

Confidential Containers is tested with attestation on the following platforms:

  • Intel TDX

The following platforms are untested or partially supported:

  • IBM Z SE

The following platforms are in development:

  • Intel SGX


The following are known limitations of this release:

  • Platform support is currently limited, and rapidly changing
    • S390x is not supported by the CoCo operator
    • AMD SEV-ES has not been tested.
    • AMD SEV does not support container image signature validation.
  • Attestation and key brokering support is still under development
    • The disk-based key broker client (KBC) is used when there is no HW support, but is not suitable for production (except with encrypted VM images).
    • Currently, there are two KBS that can be used:
      • simple-kbs: simple key broker service (KBS) for SEV(-ES).
      • Verdictd: An external project with which Attestation Agent can conduct remote attestation communication and key acquisition via EAA KBC
    • The full-featured generic KBS and the corresponding KBC are still in the development stage.
    • For developers, other KBCs can be experimented with.
    • AMD SEV must use a KBS even for unencrypted images.
  • The format of encrypted container images is still subject to change
    • The oci-crypt container image format itself may still change
    • The tools to generate images are not in their final form
    • The image format itself is subject to change in upcoming releases
    • Image repository support for encrypted images is unequal
  • CoCo currently requires a custom build of containerd
    • The CoCo operator will deploy the correct version of containerd for you
    • Changes are required to delegate PullImage to the agent in the virtual machine
    • The required changes are not part of the vanilla containerd
    • The final form of the required changes in containerd is expected to be different
    • crio is not supported
  • CoCo is not fully integrated with the orchestration ecosystem (Kubernetes, OpenShift)
    • OpenShift is a non-started at the moment due to their dependency on CRIO
    • Existing APIs do not fully support the CoCo security and threat model
    • Some commands accessing confidential data, such as kubectl exec, may either fail to work, or incorrectly expose information to the host
    • Container image sharing is not possible in this release
    • Container images are downloaded by the guest (with encryption), not by the host
    • As a result, the same image will be downloaded separately by every pod using it, not shared between pods on the same host.
  • The CoCo community aspires to adopting open source security best practices, but not all practices are adopted yet.
    • We track our status with the OpenSSF Best Practices Badge, which was at 43% at the time of this release.
    • The main gaps are in test coverage, both general and security tests.
    • Vulnerability reporting mechanisms also need to be created. Public github issues are still appropriate for this release until private reporting is established.

CVE Fixes

None - This is our first release.