Software Bill of Materials

A Software Bill of Materials (SBOM) is a complete, formally structured list of components that are required to build a given piece of software. SBOM provides insight into the software supply chain and any potential concerns related to license compliance and security that might exist.

The Cilium SBOM is generated using the bom tool. To learn more about SBOM, see what an SBOM can do for you.

Prerequisites

Install cosign

Download SBOM

The SBOM can be downloaded from the supplied Cilium image using the cosign download sbom command.

$ cosign download sbom --output-file sbom.spdx <Image URL>

Verify SBOM Image Signature

To ensure the SBOM is tamper-proof, its signature can be verified using the cosign verify command.

$ COSIGN_EXPERIMENTAL=1 cosign verify --certificate-github-workflow-repository cilium/cilium --certificate-oidc-issuer https://token.actions.githubusercontent.com --attachment sbom <Image URL> | jq

It can be validated that the image was signed using Github Actions in the Cilium repository from the Issuer and Subject fields of the output.