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Chainguard Container for kubelet-csr-approver-fips

Kubernetes controller to enable automatic kubelet CSR validation after a series of (configurable) security checks

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/kubelet-csr-approver-fips:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Compatibility Notes

Chaingaurd's kubelet-csr-approver-fips container image is comparable to the kubelet-csr-approver image. Like most other Chainguard container images, the kubelet-csr-approver-fips container image contains only the dependencies it needs to function, and doesn't include things like a shell or package manager.

FIPS Support

The kubelet-csr-approver-fips Chainguard Image ships with a validated redistribution of the OpenSSL's FIPS provider module. For more on FIPS support in Chainguard Images, consult the guide on FIPS-enabled Chainguard Images on Chainguard Academy

Getting Started

The Chainguard's kubelet-csr-approver-fips container image can be installed via the kubelet-csr-approver helm chart.

Create a values.yaml file with the following values

operator:
  image:
    repository: cgr.dev/ORGANIZATION/kubelet-csr-approver-fips
    tag: latest
  providerRegex: '^node-\w*\.int\.company\.ch$'
  providerIpPrefixes: '192.168.8.0/22'
  maxExpirationSeconds: '86400'
  bypassDnsResolution: 'false'

Make sure to replace ORGANIZATION with your organization.

Run the following command to install the helm chart:

helm repo add kubelet-csr-approver https://postfinance.github.io/kubelet-csr-approver
helm install kubelet-csr-approver kubelet-csr-approver/kubelet-csr-approver -n kube-system -f values.yaml

We can then try creating a CertificateSigningRequest resource like below:

apiVersion: certificates.k8s.io/v1
kind: CertificateSigningRequest
metadata:
  name: test-node-csr-valid
spec:
  request: $(base64 -w0 < /tmp/test-node.csr)
  signerName: kubernetes.io/kubelet-serving
  usages: ["digital signature","key encipherment","server auth"]
  groups: ["system:nodes"]

This should be Approved/Denied by the controller accordingly.

Documentation and Resources

What are Chainguard Containers?

Chainguard Containers are minimal container images that are secure by default.

In many cases, the Chainguard Containers tagged as :latest contain only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager. Chainguard Containers are built with Wolfi, our Linux undistro designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a -dev variant.

Although the -dev container image variants have similar security features as their more minimal versions, they feature additional software that is typically not necessary in production environments. We recommend using multi-stage builds to leverage the -dev variants, copying application artifacts into a final minimal container that offers a reduced attack surface that won’t allow package installations or logins.

Learn More

To better understand how to work with Chainguard Containers, please visit Chainguard Academy and Chainguard Courses.

In addition to Containers, Chainguard offers VMs and Libraries. Contact Chainguard to access additional products.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.

Licenses

Chainguard container images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" tag of this image:

  • Apache-2.0

  • GCC-exception-3.1

  • GPL-3.0-or-later

  • LGPL-2.1-or-later

  • MIT

  • MPL-2.0

For a complete list of licenses, please refer to this Image's SBOM.

Software license agreement

Compliance

This is a FIPS validated image for FedRAMP compliance.

This image is STIG hardened and scanned against the DISA General Purpose Operating System SRG with reports available.

Learn more about STIGsGet started with STIGs

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