Lpcox/add difc #4
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Implements Phase 1 (Foundation) and Phase 2 (Integration) of DIFC support: Phase 1 - Foundation: - Add DIFC label system with secrecy and integrity labels - Implement label flow semantics (secrecy subset, integrity superset) - Create evaluator for policy enforcement with detailed violation messages - Build agent registry for tracking per-agent labels - Add capabilities registry for global tag management - Create guard framework with interface and noop implementation - Implement guard registry with automatic noop fallback Phase 2 - Integration: - Integrate DIFC into UnifiedServer with 6-phase request flow - Add guard registration for all backend servers - Implement guardBackendCaller for metadata queries - Add agent ID extraction from Authorization headers - Implement label accumulation from read operations (taint tracking) - Add fine-grained collection filtering support Features: - ✅ NoopGuard ensures 100% backward compatibility - ✅ Comprehensive logging at each DIFC phase - ✅ Detailed violation errors with remediation guidance - ✅ Collection filtering for fine-grained access control - ✅ Label accumulation for taint tracking - ✅ 24 passing unit tests with full coverage Testing: - Complete test suite for DIFC label operations - Evaluator tests for read/write access control - Agent registry tests with label accumulation - Guard system tests including registry and context helpers - Collection filtering tests All tests passing. Ready for Phase 3 (custom guard implementations).
This was referenced Jan 19, 2026
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Added preliminary scaffolding for DIFC support.