Securing the Software Supply Chain (SLSA, SBOM, Signing)
⚡ TL;DR: Most of your production code is dependencies you didn't write, so the supply chain is the attack surface. Shift security left with SBOMs, signing and provenance via Sigstore, the SLSA levels, and least-privilege CI. Contents You didn't write most of your production code Shift left: security in the pipeline, not after it SBOM: an ingredients label for your software Signing and provenance:…
Most of the code running in production comes from dependencies you didn't write. A single package can have hundreds or thousands of transitive dependencies. This software supply chain is the new attack surface that attackers exploit. Securing it requires a multi-faceted approach.
Shift left security into your pipeline, not just after. Run security checks early, during pull requests, not weeks later after a breach. By catching vulnerable dependencies early, you can quickly update them.
Generate a Software Bill of Materials (SBOM) for every build. An SBOM is an inventory of every component in your artifact, including transitive dependencies. Store the SBOM and query it to see if you're affected by known vulnerabilities like log4shell. Tools like Syft and Grype can generate and scan SBOMs.
Sign and prove the integrity of your artifacts. Use keyless signing with Sigstore's cosign tool to sign images after they've been scanned. Attach the SBOM as a signed attestation so deployers can verify the image really came from your source. Verify the signature and provenance before running images in production.
Follow the SLSA (Software Supply Chain Levels for Software Artifacts) maturity model to harden your build process. SLSA provides a ladder of best practices from level 1 (no security considerations) to level 4 (full verification and attestation). Aim for higher levels to ensure more trustworthy builds.
A few common mistakes lead to costly hours: not maintaining an SBOM per build, not signing images, not verifying signatures at deploy time. The key is to treat every input to your build as untrusted until proven otherwise.
For engineers maintaining CI/CD pipelines, understanding SBOMs, signing, provenance, and SLSA levels is essential. No deep security background is required—these concepts are explained from scratch. Familiarity with your pipeline (build → test → publish) is assumed. By shifting security left, generating SBOMs, signing and verifying artifacts, and following SLSA levels, you can significantly harden your software supply chain.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — it may contain errors, so check the original before relying on it.
