Why We Don't Trust the Database with Authentication
4 days ago
- #Database Authentication
- #API Security
- #Defense in Depth
- Do not treat the database as the ultimate source of truth for API authentication, as it creates a dangerous vulnerability that can lead to full-system breaches.
- SQL injection can bypass API security by allowing attackers to copy and replace API key hashes, granting unauthorized access across tenants.
- Use cryptographic binding with a server-side pepper to sign API keys, tying them to structural context like key ID, rotation version, and organization ID to prevent hash swapping attacks.
- Implement rollback resistance by including a rotation version in the hash and using database triggers to enforce a one-way ratchet on version increments.
- Enforce multi-layered tenancy checks at routing, authentication, application, and database schema levels to prevent cross-tenant data leakage.
- Enable zero-downtime key rotation with grace periods and triggers to manage old keys securely without disrupting client systems.
- Architectural simplicity and mathematical rigor, rather than complex infrastructure, provide true security by containing failures and preventing breaches.