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Surface.Secrets Provider Chain

Module

Scanner

Status

VERIFIED

Description

Pluggable secret provider chain with backends for Kubernetes mounted secrets, file-based secrets, and offline credential stores. Provides typed handles for attestation signing keys, CAS tokens, and registry credentials.

Implementation Details

  • Provider Interface:
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/ISurfaceSecretProvider.cs - ISurfaceSecretProvider interface for pluggable secret providers
  • Provider Implementations:
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/CompositeSurfaceSecretProvider.cs - CompositeSurfaceSecretProvider chaining multiple providers with fallback
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/KubernetesSurfaceSecretProvider.cs - KubernetesSurfaceSecretProvider reading secrets from Kubernetes mounted volumes
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/FileSurfaceSecretProvider.cs - FileSurfaceSecretProvider reading secrets from file system paths
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/InlineSurfaceSecretProvider.cs - InlineSurfaceSecretProvider for inline/environment-variable secrets
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/InMemorySurfaceSecretProvider.cs - In-memory provider for testing
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/OfflineSurfaceSecretProvider.cs - OfflineSurfaceSecretProvider for air-gapped credential stores
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/AuditingSurfaceSecretProvider.cs - AuditingSurfaceSecretProvider wrapping providers with access auditing
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/Providers/CachingSurfaceSecretProvider.cs - CachingSurfaceSecretProvider caching secret lookups
  • Typed Secret Handles:
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/AttestationSecret.cs - AttestationSecret typed handle for attestation signing keys
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/CasAccessSecret.cs - CasAccessSecret typed handle for CAS (Content-Addressable Storage) tokens
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/RegistryAccessSecret.cs - RegistryAccessSecret typed handle for container registry credentials
  • Request Model:
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/SurfaceSecretRequest.cs - Request model for secret retrieval
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/SurfaceSecretHandle.cs - Handle wrapping resolved secrets
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/SurfaceSecretNotFoundException.cs - Exception when secrets are not found
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/SurfaceSecretsOptions.cs - Configuration options
  • DI & Integration:
    • src/Scanner/__Libraries/StellaOps.Scanner.Surface.Secrets/ServiceCollectionExtensions.cs - DI registration for surface secrets
    • src/Scanner/StellaOps.Scanner.Worker/Options/ScannerStorageSurfaceSecretConfigurator.cs - Worker-side secret configuration
    • src/Scanner/StellaOps.Scanner.WebService/Options/ScannerSurfaceSecretConfigurator.cs - WebService-side secret configuration
  • Tests:
    • src/Scanner/__Tests/StellaOps.Scanner.Surface.Secrets.Tests/InlineSurfaceSecretProviderTests.cs - Inline provider tests
    • src/Scanner/__Tests/StellaOps.Scanner.Surface.Secrets.Tests/FileSurfaceSecretProviderTests.cs - File provider tests

E2E Test Plan

  • Configure a composite provider chain (Kubernetes -> File -> Offline) and verify secrets are resolved from the first available provider
  • Verify KubernetesSurfaceSecretProvider reads secrets from Kubernetes mounted volumes at expected paths
  • Verify AttestationSecret typed handle correctly provides attestation signing key material
  • Verify RegistryAccessSecret typed handle provides registry credentials for authenticated pulls
  • Verify AuditingSurfaceSecretProvider logs all secret access for audit trail
  • Verify OfflineSurfaceSecretProvider works in air-gapped environments without network access

Verification

Check Result
Tier 0 - Source files exist PASS
Tier 1 - Build + code review PASS
Tier 2 - Integration tests PASS
Verified 2026-02-13T18:10:00Z