# Sprint Completion Summary - 2026-01-02

## Archived Sprints

This directory contains completed sprints that were finalized on 2026-01-02.

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## 1. SPRINT_20251230_001_BE - Tiered Evidence Backport Resolver

**Status:** ✅ COMPLETE (All 38 tasks)

### Overview
Enhanced the backport patch resolver with proper version comparison semantics, derivative distro mapping, bug ID extraction, and 5-tier evidence hierarchy.

### Key Deliverables
- **Phase 1 - Version Comparator Integration (5 tasks)**
  - Created `IVersionComparatorFactory` interface
  - Wired RPM/Deb/APK comparators into `BackportStatusService`
  - Updated `EvaluateBoundaryRules` with proof lines and audit trails

- **Phase 2 - RangeRule Implementation (5 tasks)**
  - Implemented `EvaluateRangeRules` with proper version semantics
  - Added inclusive/exclusive boundary handling
  - Low confidence designation for NVD-sourced ranges (Tier 5)

- **Phase 3 - Derivative Distro Mapping (7 tasks)**
  - Created `StellaOps.DistroIntel` library
  - RHEL ↔ Alma/Rocky/CentOS mappings (Major releases 7-10)
  - Ubuntu ↔ LinuxMint/Pop!_OS mappings
  - Debian ↔ Ubuntu mappings
  - Confidence penalties: 0.95x (High) / 0.80x (Medium)

- **Phase 4 - Bug ID → CVE Mapping (9 tasks)**
  - Debian bug regex extraction (`Closes: #123456`)
  - RHBZ bug regex extraction (`RHBZ#123456`)
  - Launchpad bug regex extraction (`LP: #123456`)
  - Created `IBugCveMappingService` with `DebianSecurityTrackerClient` and `RedHatErrataClient`
  - `BugCveMappingRouter` with 24h TTL caching

- **Phase 5 - Affected Functions Extraction (8 tasks)**
  - `FunctionSignatureExtractor` for C, Go, Python, Rust, Java, JavaScript
  - Fuzzy function matching with Levenshtein similarity

- **Phase 6 - Confidence Tier Alignment (5 tasks)**
  - Expanded `RulePriority` enum to 9-level 5-tier hierarchy
  - Updated `EvidencePointer` with `TierSource` and `EvidenceTier` enum

### Files
- `SPRINT_20251230_001_BE_backport_resolver_tiered_evidence.md` - Main tracker
- `SPRINT_20251230_001_BE_backport_resolver_DESIGN.md` - Technical design doc
- `SPRINT_20251230_001_BE_backport_resolver_TESTS.md` - Test specification

### Test Coverage
- 125 BackportProof tests passing
- 34 TierPrecedenceTests
- 47 FunctionSignatureExtractor tests
- 58 FuzzyMatchingExtensions tests

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## 2. SPRINT_20260102_001_BE - Binary Delta Signatures

**Status:** ✅ COMPLETE (All 43 tasks)

### Overview
Implemented binary-level delta signature detection for identifying backported security patches across binaries without source code, enabling detection of security fixes that don't appear in changelogs or SBOMs.

### Key Deliverables
- **Phase 1 - Disassembly Abstractions (4 tasks)**
  - Created `StellaOps.Disassembly.Abstractions` library
  - Defined `IDisassemblyResult`, `IDisassembledFunction`, `IBasicBlock`, `IInstruction`

- **Phase 2 - Disassembly Orchestration (6 tasks)**
  - Created `StellaOps.Disassembly` orchestrator library
  - Implemented `DisassemblyOrchestrator` with format routing
  - Auto-detection for PE, ELF, Mach-O formats

- **Phase 3 - B2R2 Backend (6 tasks)**
  - Created `StellaOps.Disassembly.B2R2` for ELF/Mach-O
  - Implemented `B2R2DisassemblerFactory` and `B2R2Disassembler`
  - Symbol resolution and function boundary detection

- **Phase 4 - Iced Backend (5 tasks)**
  - Created `StellaOps.Disassembly.Iced` for PE/x86
  - Implemented `IcedDisassemblerFactory` and `IcedDisassembler`

- **Phase 5 - Normalization (6 tasks)**
  - Created `StellaOps.Normalization` library
  - Implemented register, constant, and jump target normalization
  - `CanonicalInstructionBuilder` for deterministic output

- **Phase 6 - Delta Signature Generation (8 tasks)**
  - Created `StellaOps.DeltaSig` library
  - `DeltaSignatureGenerator` for computing function-level delta hashes
  - `SymbolHasher` for symbol-based lookup
  - PostgreSQL storage integration

- **Phase 7 - Scanner Integration (4 tasks)**
  - Added `DeltaSignature` to `MatchMethod` enum
  - Extended `IBinaryVulnerabilityService` with delta sig lookup
  - Created `DeltaSigAnalyzer` in Scanner.Worker

- **Phase 8 - VEX Evidence Emission (4 tasks)**
  - Created `DeltaSignatureEvidence` model
  - Created `DeltaSigVexEmitter` service
  - Extended `EvidenceBundle` with DeltaSignature field

### Created Libraries
1. `StellaOps.Disassembly.Abstractions` - Core abstractions
2. `StellaOps.Disassembly` - Orchestration layer
3. `StellaOps.Disassembly.B2R2` - F# backend for ELF/Mach-O
4. `StellaOps.Disassembly.Iced` - C# backend for PE
5. `StellaOps.Normalization` - Instruction normalization
6. `StellaOps.DeltaSig` - Delta signature generation

### Test Coverage
- 74 DeltaSig tests passing
- 25 DeltaSigVexEmitter tests
- All BinaryIndex solution tests passing

### Documentation
- 7 AGENTS.md files for BinaryIndex libraries
- ADR 0044: Binary Delta Signatures for Backport Detection

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## 3. SPRINT_20260102_002_BE - In-Toto Link Generation

**Status:** ✅ COMPLETE (All 25 tasks)

### Overview
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.

### Key Deliverables
- **Phase 1 - Core Models (6 tasks)**
  - `InTotoLink`, `InTotoLinkPredicate`, `InTotoMaterial`, `InTotoProduct` models
  - `ILinkRecorder` interface for step execution recording
  - `LinkRecorder` implementation with TimeProvider injection

- **Phase 2 - Layout Verification (7 tasks)**
  - `ILayoutVerifier` interface
  - `InTotoLayout` model with steps and trusted keys
  - `LayoutVerifier` with step order, functionary, and threshold validation

- **Phase 3 - Signing Integration (2 tasks)**
  - `IInTotoLinkSigningService` interface
  - `InTotoLinkSigningService` implementation using existing DSSE infrastructure

- **Phase 4 - Scanner/CLI/API Integration (5 tasks)**
  - `IInTotoLinkEmitter` interface for scanner integration
  - `POST /api/v1/attestor/links` WebService endpoint
  - `stella attest link` CLI command

- **Phase 5 - Testing & Documentation (5 tasks)**
  - 55 in-toto tests passing
  - 3 golden fixtures (scan link, build link, layout)
  - Complete in-toto usage guide

### Files Created
- `src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/*.cs`
- `src/Attestor/StellaOps.Attestor/StellaOps.Attestor.Core/InToto/Layout/*.cs`
- `docs/modules/attestor/intoto-link-guide.md`

### Test Coverage
- 55 in-toto tests passing
- 15 golden tests with fixtures

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## 4. SPRINT_20260102_003_BE - VEX Proof Objects

**Status:** ✅ COMPLETE (All 30 tasks)

### Overview
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.

### Key Deliverables
- **Phase 1 - Proof Object Models (7 tasks)**
  - `VexProof` with 25+ record types for complete resolution trace
  - `VexProofBuilder` fluent builder with deterministic ordering
  - `VexProofSerializer` with RFC 8785 canonical JSON and digest computation

- **Phase 2 - Propagation Rules (6 tasks)**
  - `IPropagationRuleEngine` interface
  - `PropagationRuleEngine` with 4 rules: DirectDependencyAffected, TransitiveDependency, DependencyFixed, DependencyNotAffected

- **Phase 3 - Condition Evaluation (6 tasks)**
  - `IConditionEvaluator` interface
  - `ConditionEvaluator` with Platform, Distro, Feature, BuildFlag handlers

- **Phase 4 - Engine Integration (4 tasks)**
  - `VexConsensusEngine.ComputeConsensusWithProofAsync` for all 4 modes
  - `VexResolutionResult` record with proof attachment
  - `ComputeConsensusWithExtensionsAsync` for propagation + conditions

- **Phase 5 - Policy & API (3 tasks)**
  - `VexProofGate` policy gate for confidence/conflict/age/signature validation
  - `POST /api/v1/vexlens/consensus:withProof` endpoint

- **Phase 6 - Testing & Documentation (4 tasks)**
  - 86 VexLens tests passing
  - `docs/api/vex-proof-schema.md` complete reference

### Files Created
- `src/VexLens/StellaOps.VexLens/Proof/*.cs`
- `src/VexLens/StellaOps.VexLens/Propagation/*.cs`
- `src/VexLens/StellaOps.VexLens/Conditions/*.cs`
- `src/Policy/StellaOps.Policy.Engine/Gates/VexProofGate.cs`
- `docs/api/vex-proof-schema.md`

### Test Coverage
- 86 VexLens tests passing
- VexProofBuilder, PropagationRuleEngine, ConditionEvaluator tests
- Shuffle determinism tests (13 tests)

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## 5. SPRINT_20260102_004_BE - Polish and Testing

**Status:** ✅ COMPLETE (All 21 tasks)

### Overview
Completed CycloneDX 1.7 mapping, shuffle determinism tests, golden corpus curation, and end-to-end regression suite for full pipeline determinism validation.

### Key Deliverables
- **CycloneDX 1.7 Complete (5 tasks)**
  - `analysis.state` → VexStatus mapping (resolved, exploitable, in_triage, etc.)
  - `analysis.justification` mapping (code_not_present, code_not_reachable, etc.)
  - `analysis.response` and `analysis.detail` preservation

- **Shuffle Determinism Tests (4 tasks)**
  - `VexProofShuffleDeterminismTests.cs` with 13 tests
  - Tests for 2, 5, and 10 statement scenarios
  - Proves consensus is order-independent

- **Golden Corpus (8 tasks)**
  - 20 curated backport test cases from real-world CVEs
  - Cases include: Heartbleed, Baron Samedit, Shellshock, Looney Tunables, XZ backdoor
  - `GoldenCorpusLoader` with filtering by distro/CVE/reason
  - `GoldenCorpusTestRunner` with 9 xUnit tests

- **E2E Regression Suite (4 tasks)**
  - `VexLensPipelineDeterminismTests.cs` - 8 E2E tests
  - `VexLensRegressionTests.cs` - 7 regression tests
  - CI integration in nightly-regression.yml
  - Testing strategy documentation

### Files Created
- `src/__Tests/__Datasets/GoldenBackports/` (20 case directories)
- `src/VexLens/__Tests/StellaOps.VexLens.Tests/Golden/GoldenCorpus*.cs`
- `src/VexLens/__Tests/StellaOps.VexLens.Tests/E2E/VexLens*Tests.cs`
- `docs/modules/vex-lens/testing-strategy.md`

### Test Coverage
- 86 VexLens tests passing
- 20 golden corpus cases
- 8 E2E determinism tests
- 7 regression tests

### Known Issues
- R-003: `VexProofBuilder.GenerateProofId` uses `Guid.NewGuid()` - violates AGENTS.md Rule 8.2; tracked for future IGuidGenerator injection

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## Impact Summary

These five sprints (including two 20251230 backport resolver sprints) together deliver a comprehensive vulnerability analysis system:

1. **Version-aware analysis** - Proper handling of RPM, Debian, and Alpine version semantics
2. **Multi-distro support** - Cross-distro evidence sharing via derivative mappings
3. **Bug tracking integration** - Debian/RHBZ/LP bug ID to CVE resolution
4. **Binary-level detection** - Delta signature matching for compiled code
5. **5-tier evidence hierarchy** - Structured confidence scoring with audit trails
6. **Supply chain provenance** - in-toto link generation for SLSA compliance
7. **Proof objects** - Complete audit trails for verdict computation
8. **Propagation rules** - Transitive dependency impact analysis
9. **Condition evaluation** - Platform/distro/feature context handling
10. **Golden corpus** - 20 real-world backport test cases
11. **Determinism validation** - Shuffle tests prove order-independence

**Total tasks completed:** 200+ tasks
**Total tests added:** 500+ tests