backspace/docs/systems/security-scanning.md

Security Scanning & Supply-Chain Assurance

Automated, continuous scanning wired into GitHub Actions. This document is the reference for what runs, where results go, and the one-time settings a maintainer must enable. Current state: report-only — scanners surface findings in the Security tab but do not block merges yet. Enforcement (blocking) is turned on in a later change once the remediation pass has cleared the backlog.

Workflows

File	Purpose	Trigger	Result
.github/dependabot.yml	Dependency + action + base-image update PRs	weekly	PRs
.github/workflows/codeql.yml	CodeQL SAST (javascript-typescript, build-mode none)	PR + push main + weekly	Security tab
.github/workflows/security.yml	gitleaks (secrets, full history), OSV-Scanner (deps), Trivy config (IaC), Trivy license	PR + push main + weekly	Security tab
.github/workflows/scorecard.yml	OpenSSF Scorecard (repo posture)	push main + weekly	Security tab + public badge

Tiered policy (target, enforced in a later change)

• Always block: gitleaks secret hit; OSV/Trivy fixable HIGH/CRITICAL; Trivy disallowed license.
• Advisory (SARIF → Security tab): CodeQL alerts; OSV/Trivy unfixable or medium/low; Scorecard.

Code-level gates (OSV, Trivy, gitleaks) block via workflow exit codes. CodeQL merge-blocking, Dependabot alerts, and native secret-scanning are GitHub settings — see the checklist below.

Supply-chain hardening

• Every action is pinned to a full commit SHA (# vX.Y.Z comment) — resists tag-move attacks and satisfies Scorecard's Pinned-Dependencies check.
• step-security/harden-runner (egress-policy audit) on Linux jobs.
• Least-privilege permissions: per workflow/job.
• SBOM + SLSA provenance are attached to the published container image (added with the image-scan work).

Maintainer checklist (one-time GitHub settings — NOT code)

• Repository must be public (required for the Scorecard badge/publish and the CodeQL free tier).
• Settings → Code security: enable Dependabot alerts and Dependabot security updates.
• Settings → Code security: enable Secret scanning + Push protection.
• Settings → Code security: enable CodeQL / code-scanning merge protection so high-severity alerts block PRs (the code-level gates do the rest).
• Branch protection on main: require the CI + security status checks to pass.
• Manual image bumps: Dependabot does not track docker-compose.yml image: pins — update caddy and livekit/livekit-server by hand when new releases ship. (Renovate, which parses compose, is an optional future alternative.)