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Per-Layer SBOM Export API

Module

Scanner

Status

IMPLEMENTED

Description

Per-layer SBOMs stored as individual CAS artifacts with API endpoints to retrieve layer-specific SBOMs (GET /scans/{id}/layers, GET /scans/{id}/layers/{digest}/sbom with format param), content negotiation, immutable caching (ETag, Cache-Control), and CLI commands (stella scan layer-sbom, stella scan recipe).

Implementation Details

  • API Endpoints:
    • src/Scanner/StellaOps.Scanner.WebService/Endpoints/LayerSbomEndpoints.cs - LayerSbomEndpoints with GET /scans/{id}/layers (list layers) and GET /scans/{id}/layers/{digest}/sbom (retrieve per-layer SBOM with format negotiation)
    • src/Scanner/StellaOps.Scanner.WebService/Endpoints/ScanEndpoints.cs - Scan endpoints integrating per-layer SBOM access
  • Layer SBOM Service:
    • src/Scanner/StellaOps.Scanner.WebService/Services/ILayerSbomService.cs - ILayerSbomService interface for layer SBOM operations
    • src/Scanner/StellaOps.Scanner.WebService/Services/LayerSbomService.cs - LayerSbomService manages per-layer SBOM retrieval with content negotiation (SPDX, CycloneDX) and immutable caching
    • src/Scanner/StellaOps.Scanner.WebService/Services/SurfacePointerService.cs - SurfacePointerService tracks surface-level pointers for layer SBOMs
  • Layer SBOM Composition:
    • src/Scanner/__Libraries/StellaOps.Scanner.Emit/Composition/LayerSbomComposer.cs - Composes per-layer SBOMs
    • src/Scanner/__Libraries/StellaOps.Scanner.Emit/Composition/SpdxLayerWriter.cs - SPDX format layer SBOM writer
    • src/Scanner/__Libraries/StellaOps.Scanner.Emit/Composition/CycloneDxLayerWriter.cs - CycloneDX format layer SBOM writer

E2E Test Plan

  • Call GET /scans/{id}/layers and verify a list of container layers with digests and sizes is returned
  • Call GET /scans/{id}/layers/{digest}/sbom?format=spdx and verify a valid SPDX SBOM is returned for the specific layer
  • Call GET /scans/{id}/layers/{digest}/sbom?format=cyclonedx and verify a valid CycloneDX SBOM is returned
  • Verify ETag and Cache-Control headers are set for immutable caching of per-layer SBOMs
  • Verify content negotiation via Accept header works as an alternative to the format query parameter
  • Verify requesting a non-existent layer digest returns 404