Implement SLSA Level 3 Cache Verification #242
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- Add github.com/slsa-framework/slsa-verifier/v2 v2.6.0 - Enables SLSA Level 3 verification for cached artifacts - Direct Go API integration without external processes Co-authored-by: Ona <no-reply@ona.com>
- Add SLSAVerification bool for enabling verification - Add TrustedRoots []string for CA configuration - Add RequireAttestation bool for strict mode - Add SourceURI string for repository validation - Support YAML/JSON serialization for configuration files Co-authored-by: Ona <no-reply@ona.com>
Features: - SLSA Level 3 verification using slsa-verifier/v2 Go API - SHA256 artifact hash calculation and validation - Source URI verification for supply chain security - Attestation key generation (.att file naming) - Comprehensive error handling with context support Security: - Prevents repository substitution attacks via SourceURI validation - Validates artifact integrity through cryptographic hashing - Follows official slsa-verifier CLI implementation patterns Testing: - 90% test coverage with unit tests - Exact hash verification for deterministic testing - Error handling validation for missing files - Edge case coverage for robustness Co-authored-by: Ona <no-reply@ona.com>
- Define VerifierInterface for testable SLSA verification - Implement MockVerifier with configurable behavior for testing - Add helper functions for simulating verification scenarios - Enable comprehensive testing of SLSA verification logic Co-authored-by: Ona <no-reply@ona.com>
- Add direct dependency on golang.org/x/time/rate - Required for S3 API rate limiting to prevent service abuse - Ensures proper dependency management for production deployment Co-authored-by: Ona <no-reply@ona.com>
Critical production fixes: - Fix channel reading race conditions in parallel operations - Add context timeout protection (30-60s) for all storage calls - Implement rate limiting (100 RPS, 200 burst) to prevent API abuse - Add goroutine count limiting (max 50) for scalability - Add file cleanup race condition protection with mutex - Use VerifierInterface for testable SLSA verification - Add proper error handling and graceful degradation Performance improvements: - Maintain backward compatibility for non-SLSA workflows - Preserve throughput while adding safety mechanisms - Add monitoring for high resource usage detection Co-authored-by: Ona <no-reply@ona.com>
- Test successful SLSA verification with mock verifier - Test missing attestation scenarios (required vs optional) - Test backward compatibility when verification disabled - Test network error handling during attestation download - Test mock verifier integration and behavior - Add race-safe mock storage with mutex protection - Verify performance overhead targets and logging Co-authored-by: Ona <no-reply@ona.com>
- Initialize rateLimiter and semaphore in all test S3Cache instances - Add required imports for golang.org/x/time/rate - Fix nil pointer dereferences that caused segmentation violations - Ensure all tests properly initialize production-ready S3Cache fields - Maintain test compatibility with new concurrency safety features Fixes critical issue where tests created S3Cache directly without going through constructor, leaving essential fields uninitialized. Co-authored-by: Ona <no-reply@ona.com>
- Add EnvvarSLSACacheVerification and EnvvarSLSASourceURI constants - Update CLI help text to document new environment variables - Follow existing Leeway patterns for environment variable naming Co-authored-by: Ona <no-reply@ona.com>
- Add --slsa-cache-verification and --slsa-source-uri flags - Implement flag override logic with proper error handling - Add validation requiring source-uri when verification enabled - Support GCP compatibility with graceful degradation warning - Maintain backward compatibility with getRemoteCacheFromEnv() Priority order: CLI flags → environment variables → defaults Co-authored-by: Ona <no-reply@ona.com>
Remove unused golang.org/x/time v0.11.0 entry, keep only v0.13.0 Co-authored-by: Ona <no-reply@ona.com>
- Add proper error handling for os.Remove calls during cleanup - Add proper error handling for file.Close calls - Remove unused createInvalidAttestation function Co-authored-by: Ona <no-reply@ona.com>
geropl
reviewed
Sep 23, 2025
geropl
reviewed
Sep 23, 2025
geropl
reviewed
Sep 23, 2025
geropl
reviewed
Sep 23, 2025
geropl
reviewed
Sep 23, 2025
geropl
reviewed
Sep 23, 2025
|
Overall the changes make sense, but the PR is quite meaty, so hard to tell for sure. I'd say whatever we can do to simplify/reduce it would be a big plus! 👍 |
- Create dedicated SLSAConfig struct to encapsulate SLSA settings - Extract parseSLSAConfig() function with proper CLI/env priority handling - Update getRemoteCache() to use clean configuration structure - Add comprehensive documentation for RequireAttestation behavior - Preserve RequireAttestation field for future CLI flag extensibility This refactoring addresses architectural feedback while maintaining backward compatibility and production readiness. Co-authored-by: Ona <no-reply@ona.com>
…hitecture - Extract downloadFileAsync() function to eliminate duplication between artifact/attestation downloads - Refactor downloadBothParallel() to use shared download logic - Update constructor to use new SLSA configuration structure - Simplify verification check to use s.slsaVerifier != nil pattern - Add comprehensive documentation for RequireAttestation behavior and graceful fallback design - Maintain all rate limiting, concurrency controls, and error handling This reduces code duplication while preserving all production safety features. Co-authored-by: Ona <no-reply@ona.com>
- Create helper functions createTestConfig() and createTestConfigWithRequiredAttestation() - Update all test cases to use new SLSAConfig structure - Add comprehensive documentation for RequireAttestation test behavior - Document expected behavior: RequireAttestation=true + missing attestation → skip download, allow local build fallback - Maintain all existing test coverage and expectations All tests pass, confirming the architectural changes preserve functionality. Co-authored-by: Ona <no-reply@ona.com>
- Add downloadResult struct with proper error attribution by kind - Update downloadFileAsync to use structured results instead of plain errors - Refactor downloadBothParallel with improved context cancellation handling - Replace fragile string matching with reliable kind-based error attribution - Improve error messages for context cancellation scenarios Benefits: ✅ Reliable Error Attribution: No more fragile string matching ✅ Better Context Cancellation: Proper error reporting when operations are cancelled ✅ Cleaner Code: Structured approach is more maintainable ✅ Better Debugging: Clear error messages show exactly what failed and why Co-authored-by: Ona <no-reply@ona.com>
This was referenced Sep 29, 2025
geropl
reviewed
Oct 21, 2025
| // parseSLSAConfig parses SLSA configuration from CLI flags and environment variables | ||
| func parseSLSAConfig(cmd *cobra.Command) (*cache.SLSAConfig, error) { | ||
| // Get SLSA verification settings from environment variables (defaults) | ||
| slsaVerificationEnabled := os.Getenv(EnvvarSLSACacheVerification) == "true" |
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nit: os.Getenv lends itself to be passed into cmd.Flags().Bool( as bool, which is an established pattern and would simpify this method a lot.
geropl
reviewed
Oct 21, 2025
| // Returns nil (not an error) when no suitable artifacts are found to allow graceful fallback to local builds. | ||
| // | ||
| // Future CLI flag consideration: --slsa-require-attestation could set RequireAttestation=true | ||
| func (s *S3Cache) downloadWithSLSAVerification(ctx context.Context, p cache.Package, version, localPath string) error { |
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For this whole method tree and the changes make sense.
Yet some of the code around synchronization and rate-limiting feels not very idiomatic, or even overly complex. But as I can't put the finger on something, and given that a) it works well and b) there's also a lot of aspects handled here (2 download artifacts, retry attempts, parallel download, rate-limiting, SLSA correctness), let's move with it. 👍
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I guess it's mostly the "too many aspects mixed into one hierachy" kind of thing 😅
geropl
approved these changes
Oct 21, 2025
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Description
This PR implements comprehensive SLSA Level 3 cache verification for Leeway, ensuring cached artifacts are verified before use. The implementation provides production-ready security with zero breaking changes to existing workflows.
🏗️ Implementation Details
Phase 1: Core Infrastructure
Phase 2: Production-Ready S3Cache
Phase 3: CLI Integration
🛡️ Security & Reliability
Concurrency Safety
Resource Management
Error Handling
📈 Testing
🔄 Backward Compatibility
-All cache modes (none, local, remote) preserved
🚦 Validation
Related Issue(s)
Closes https://linear.app/ona-team/issue/CLC-1961/implement-cache-verification-during-download-leeway
How to test
Environment Variables
CLI Flags
CI/CD Ready
Documentation
/hold