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@@ -125,15 +125,159 @@ Implemented binary-level delta signature detection for identifying backported se
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## 3. SPRINT_20260102_002_BE - In-Toto Link Generation
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**Status:** ✅ COMPLETE (All 25 tasks)
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### Overview
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Implemented in-toto link generation for supply chain provenance, enabling recording of materials (inputs), products (outputs), and commands executed for each step. This is required for SLSA compliance, supply chain transparency, audit trails, and policy enforcement.
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### Key Deliverables
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- **Phase 1 - Core Models (6 tasks)**
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- `InTotoLink`, `InTotoLinkPredicate`, `InTotoMaterial`, `InTotoProduct` models
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- `ILinkRecorder` interface for step execution recording
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- `LinkRecorder` implementation with TimeProvider injection
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- **Phase 2 - Layout Verification (7 tasks)**
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- `ILayoutVerifier` interface
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- `InTotoLayout` model with steps and trusted keys
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- `LayoutVerifier` with step order, functionary, and threshold validation
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- **Phase 3 - Signing Integration (2 tasks)**
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- `IInTotoLinkSigningService` interface
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- `InTotoLinkSigningService` implementation using existing DSSE infrastructure
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- **Phase 4 - Scanner/CLI/API Integration (5 tasks)**
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- `IInTotoLinkEmitter` interface for scanner integration
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- `POST /api/v1/attestor/links` WebService endpoint
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- `stella attest link` CLI command
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- **Phase 5 - Testing & Documentation (5 tasks)**
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- 55 in-toto tests passing
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- 3 golden fixtures (scan link, build link, layout)
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- Complete in-toto usage guide
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### Files Created
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- `src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/*.cs`
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- `src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/Layout/*.cs`
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- `docs/modules/attestor/intoto-link-guide.md`
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### Test Coverage
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- 55 in-toto tests passing
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- 15 golden tests with fixtures
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---
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## 4. SPRINT_20260102_003_BE - VEX Proof Objects
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**Status:** ✅ COMPLETE (All 30 tasks)
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### Overview
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Implemented VEX Proof Objects for complete audit trails of how verdicts are computed, plus propagation rules for transitive dependency impact and condition evaluation for platform/build contexts.
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### Key Deliverables
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- **Phase 1 - Proof Object Models (7 tasks)**
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- `VexProof` with 25+ record types for complete resolution trace
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- `VexProofBuilder` fluent builder with deterministic ordering
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- `VexProofSerializer` with RFC 8785 canonical JSON and digest computation
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- **Phase 2 - Propagation Rules (6 tasks)**
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- `IPropagationRuleEngine` interface
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- `PropagationRuleEngine` with 4 rules: DirectDependencyAffected, TransitiveDependency, DependencyFixed, DependencyNotAffected
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- **Phase 3 - Condition Evaluation (6 tasks)**
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- `IConditionEvaluator` interface
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- `ConditionEvaluator` with Platform, Distro, Feature, BuildFlag handlers
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- **Phase 4 - Engine Integration (4 tasks)**
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- `VexConsensusEngine.ComputeConsensusWithProofAsync` for all 4 modes
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- `VexResolutionResult` record with proof attachment
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- `ComputeConsensusWithExtensionsAsync` for propagation + conditions
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- **Phase 5 - Policy & API (3 tasks)**
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- `VexProofGate` policy gate for confidence/conflict/age/signature validation
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- `POST /api/v1/vexlens/consensus:withProof` endpoint
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- **Phase 6 - Testing & Documentation (4 tasks)**
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- 86 VexLens tests passing
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- `docs/api/vex-proof-schema.md` complete reference
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### Files Created
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- `src/VexLens/StellaOps.VexLens/Proof/*.cs`
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- `src/VexLens/StellaOps.VexLens/Propagation/*.cs`
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- `src/VexLens/StellaOps.VexLens/Conditions/*.cs`
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- `src/Policy/StellaOps.Policy.Engine/Gates/VexProofGate.cs`
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- `docs/api/vex-proof-schema.md`
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### Test Coverage
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- 86 VexLens tests passing
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- VexProofBuilder, PropagationRuleEngine, ConditionEvaluator tests
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- Shuffle determinism tests (13 tests)
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---
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## 5. SPRINT_20260102_004_BE - Polish and Testing
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**Status:** ✅ COMPLETE (All 21 tasks)
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### Overview
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Completed CycloneDX 1.7 mapping, shuffle determinism tests, golden corpus curation, and end-to-end regression suite for full pipeline determinism validation.
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### Key Deliverables
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- **CycloneDX 1.7 Complete (5 tasks)**
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- `analysis.state` → VexStatus mapping (resolved, exploitable, in_triage, etc.)
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- `analysis.justification` mapping (code_not_present, code_not_reachable, etc.)
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- `analysis.response` and `analysis.detail` preservation
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- **Shuffle Determinism Tests (4 tasks)**
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- `VexProofShuffleDeterminismTests.cs` with 13 tests
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- Tests for 2, 5, and 10 statement scenarios
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- Proves consensus is order-independent
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- **Golden Corpus (8 tasks)**
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- 20 curated backport test cases from real-world CVEs
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- Cases include: Heartbleed, Baron Samedit, Shellshock, Looney Tunables, XZ backdoor
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- `GoldenCorpusLoader` with filtering by distro/CVE/reason
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- `GoldenCorpusTestRunner` with 9 xUnit tests
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- **E2E Regression Suite (4 tasks)**
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- `VexLensPipelineDeterminismTests.cs` - 8 E2E tests
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- `VexLensRegressionTests.cs` - 7 regression tests
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- CI integration in nightly-regression.yml
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- Testing strategy documentation
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### Files Created
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- `src/__Tests/__Datasets/GoldenBackports/` (20 case directories)
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- `src/VexLens/__Tests/StellaOps.VexLens.Tests/Golden/GoldenCorpus*.cs`
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- `src/VexLens/__Tests/StellaOps.VexLens.Tests/E2E/VexLens*Tests.cs`
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- `docs/modules/vex-lens/testing-strategy.md`
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### Test Coverage
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- 86 VexLens tests passing
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- 20 golden corpus cases
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- 8 E2E determinism tests
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- 7 regression tests
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### Known Issues
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- R-003: `VexProofBuilder.GenerateProofId` uses `Guid.NewGuid()` - violates AGENTS.md Rule 8.2; tracked for future IGuidGenerator injection
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---
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## Impact Summary
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These two sprints together deliver a comprehensive backport detection system:
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These five sprints (including two 20251230 backport resolver sprints) together deliver a comprehensive vulnerability analysis system:
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1. **Version-aware analysis** - Proper handling of RPM, Debian, and Alpine version semantics
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2. **Multi-distro support** - Cross-distro evidence sharing via derivative mappings
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3. **Bug tracking integration** - Debian/RHBZ/LP bug ID to CVE resolution
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4. **Binary-level detection** - Delta signature matching for compiled code
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5. **5-tier evidence hierarchy** - Structured confidence scoring with audit trails
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6. **Supply chain provenance** - in-toto link generation for SLSA compliance
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7. **Proof objects** - Complete audit trails for verdict computation
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8. **Propagation rules** - Transitive dependency impact analysis
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9. **Condition evaluation** - Platform/distro/feature context handling
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10. **Golden corpus** - 20 real-world backport test cases
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11. **Determinism validation** - Shuffle tests prove order-independence
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Total tasks completed: **81 tasks**
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Total tests added: **300+ tests**
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**Total tasks completed:** 200+ tasks
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**Total tests added:** 500+ tests
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