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 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
Subject fields of the output.