KubeCon + CloudNativeCon North America 2022

In order to ensure the trustworthiness of your software supply chain, maintainers must restate a number of assumptions. As opposed to inherently trusting build systems to serve accurate package metadata, we propose verification of every claim in the chain against the actors and tasks involved in the process. The combination of cryptographically verifiable identities with the use of transparency logs provides a novel approach to accomplish so and increase the security guarantees of your release artifacts.Project Sigstore provides a toolkit to allow organizations to publish verifiable provenance about publicly distributed artifacts. This metadata is in turn stored on the Sigstore Binary Transparency Log (Rekor), signed and verified by use of Keyless Signatures (Cosign) and the Sigstore Certificate Authority (Fulcio), and stored in an OCI registry where it can be verified, discovered, and used in policy engines. Backed by SPIFFE’s reference implementation SPIRE, all cryptographic operations are rooted in a strongly attested universal identity control plane for distributed systems.This presentation will demonstrate how a zero trust supply chain architecture can be applied to build systems, through the use of Sigstore and SPIRE for a Federated, Verifiable, Zero-Trust Supply Chain. Additionally, TektonCD will be used as the example build system and in-toto as the example provenance format.

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Zero Trust Supply Chains with Project Sigstore and SPIFFE

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