6046bad12e
CRITICAL SECURITY FIX: Implemented Defense in Depth security pattern by adding explicit TenantId verification to all Epic/Story/Task Query and Command Handlers. Security Impact: - BEFORE: Relied solely on EF Core global query filters (single layer) - AFTER: Explicit TenantId validation + EF Core filters (defense in depth) This ensures that even if EF Core query filters are accidentally disabled or bypassed, tenant isolation is still maintained at the application layer. Changes: Query Handlers (6 handlers): - GetEpicByIdQueryHandler: Added ITenantContext injection + explicit TenantId check - GetStoryByIdQueryHandler: Added ITenantContext injection + explicit TenantId check - GetTaskByIdQueryHandler: Added ITenantContext injection + explicit TenantId check - GetEpicsByProjectIdQueryHandler: Verify Project.TenantId before querying Epics - GetStoriesByEpicIdQueryHandler: Verify Epic.TenantId before querying Stories - GetTasksByStoryIdQueryHandler: Verify Story.TenantId before querying Tasks Command Handlers (5 handlers): - UpdateEpicCommandHandler: Verify Project.TenantId before updating - UpdateStoryCommandHandler: Verify Project.TenantId before updating - UpdateTaskCommandHandler: Verify Project.TenantId before updating - DeleteStoryCommandHandler: Verify Project.TenantId before deleting - DeleteTaskCommandHandler: Verify Project.TenantId before deleting Unit Tests: - Updated 5 unit test files to mock ITenantContext - All 32 unit tests passing - All 7 multi-tenant isolation integration tests passing Defense Layers (Security in Depth): Layer 1: EF Core global query filters (database level) Layer 2: Application-layer explicit TenantId validation (handler level) Layer 3: Integration tests verifying tenant isolation (test level) Test Results: - Unit Tests: 32/32 PASSING - Integration Tests: 7/7 PASSING (multi-tenant isolation) This fix addresses a critical security vulnerability where we relied on a single layer of defense (EF Core query filters) for tenant data isolation. Now we have multiple layers ensuring no cross-tenant data leaks can occur. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>