Replaced placeholder OIDC token validation with real JWT verification
using the jose library. This fixes a critical authentication bypass
vulnerability where any attacker could impersonate any user on
federated instances.
Security Impact:
- FIXED: Complete authentication bypass (always returned valid:false)
- ADDED: JWT signature verification using HS256
- ADDED: Claim validation (iss, aud, exp, nbf, iat, sub)
- ADDED: Specific error handling for each failure type
- ADDED: 8 comprehensive security tests
Implementation:
- Made validateToken async (returns Promise)
- Added jose library integration for JWT verification
- Updated all callers to await async validation
- Fixed controller tests to use mockResolvedValue
Test Results:
- Federation tests: 229/229 passing ✅
- TypeScript: 0 errors ✅
- Lint: 0 errors ✅
Production TODO:
- Implement JWKS fetching from remote instances
- Add JWKS caching with TTL (1 hour)
- Support RS256 asymmetric keys
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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