Charon/docs/reports/qa_report.md

QA & Security Report: Supply Chain Workflow Validation

Date: February 6, 2026 Target: .github/workflows/supply-chain-pr.yml Auditor: QA Security Engineer (Gemini 3 Pro) Action: Pre-commit Validation & Logic Audit

1. Automated Validation (Pre-commit)

Status: ✅ PASS

All pre-commit hooks executed successfully on the codebase.

• YAML Syntax: Validated via check-yaml. No syntax errors found.
• Linting: Validated via standard hooks. Code style is compliant.
• Consistency: No trailing whitespace or end-of-file issues.

2. Logic & Security Audit (supply-chain-pr.yml)

A. Workflow Structure & Triggers

• Trigger Mechanism: The workflow correctly uses on: workflow_run with types: [completed] to wait for the "Docker Build, Publish & Test" workflow.
  • Security Verdict: ✅ Secure. This separates the privileged supply chain verification (read/write access to security events/PRs) from the potentially untrusted build context.
• Conditions: The if condition github.event.workflow_run.conclusion == 'success' correctly ensures verification strictly follows successful builds.

B. Input Handling & Injection Prevention

• Findings: The bash scripts utilize environment variables (e.g., "${INPUT_PR_NUMBER}") instead of inline template injection (e.g., ${{ inputs.pr_number }}) for execution.
  • Impact: This mitigates script injection risks from malicious input (branch names, PR titles).
  • Verdict: ✅ Secure.

C. Logical Flow (Artifact Handover)

• Execution Order Verified:
  1. check-artifact: Identifies the pr-image-* artifact from the triggering run.
  2. download / load: Retrieves and loads the image before the SBOM generation steps.
  3. set-target: Correctly resolves the image name from the loaded artifact context.
• Verdict: ✅ Valid. The dependency chain is logically sound and ensures the scanner targets the correct image.

3. Conclusion

The supply-chain-pr.yml workflow is syntactically correct, logically sound, and adheres to security best practices for workflow_run usage. The explicit separation of "Build" (untrusted) and "Verify" (privileged) contexts is correctly implemented.

Risk Rating: 🟢 LOW Recommendation: Approved for production use.