Jason Woltje
ebd842f007
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Implemented comprehensive CSRF protection for all state-changing endpoints (POST, PATCH, DELETE) using the double-submit cookie pattern. Security Implementation: - Created CsrfGuard using double-submit cookie validation - Token set in httpOnly cookie and validated against X-CSRF-Token header - Applied guard to FederationController (vulnerable endpoints) - Safe HTTP methods (GET, HEAD, OPTIONS) automatically exempted - Signature-based endpoints (@SkipCsrf decorator) exempted Components Added: - CsrfGuard: Validates cookie and header token match - CsrfController: GET /api/v1/csrf/token endpoint for token generation - @SkipCsrf(): Decorator to exempt endpoints with alternative auth - Comprehensive tests (20 tests, all passing) Protected Endpoints: - POST /api/v1/federation/connections/initiate - POST /api/v1/federation/connections/:id/accept - POST /api/v1/federation/connections/:id/reject - POST /api/v1/federation/connections/:id/disconnect - POST /api/v1/federation/instance/regenerate-keys Exempted Endpoints: - POST /api/v1/federation/incoming/connect (signature-verified) - GET requests (safe methods) Security Features: - httpOnly cookies prevent XSS attacks - SameSite=strict prevents subdomain attacks - Cryptographically secure random tokens (32 bytes) - 24-hour token expiry - Structured logging for security events Testing: - 14 guard tests covering all scenarios - 6 controller tests for token generation - Quality gates: lint, typecheck, build all passing Note: Frontend integration required to use tokens. Clients must: 1. GET /api/v1/csrf/token to receive token 2. Include token in X-CSRF-Token header for state-changing requests Fixes #278 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>