kooltab-backoffice/docs/security.md

Security

Authentication

Device Tokens

• Format: dev_ + 48 random bytes, base64url-encoded
• Stored as SHA-256 hash in database
• Raw token returned only once during registration
• Expire after 90 days
• Revocation immediately invalidates token

Client Authentication

• Passwords hashed with bcrypt (10 rounds)
• JWT access tokens (15 minute expiration)
• Refresh tokens (30 days) with rotation and revocation; a refresh token works only once
• The dashboard keeps both tokens in SameSite=Lax cookies (Secure over HTTPS). They are readable by the dashboard's JavaScript, so an XSS bug would expose them; the short access token lifetime limits the damage

Authorization

Role-Based Access

• admin: Full access, including users and pairing or unpairing terminals
• manager (the people running the venue): products and their pictures, stock, tabs, planned customers and reminders. Accounts and tokens with the former role viewer are treated as managers
• Product pictures are public by id (GET /images/:imageId); the id is a SHA-256 hash, so it can't be guessed

Venue Isolation

• Every user and device is scoped to exactly one venue
• All service methods validate venue context from authentication
• Cross-venue access is blocked at the service layer

API Security

Headers

• Helmet for security headers
• Strict CORS (dashboard origin only)
• Body size limits enforced

Rate Limiting

• Login and device registration: 10 requests per minute per client
• General: 100 requests per minute per client
• Device sync and command acks are not rate limited (they are authenticated by the device token)

Error Handling

• Consistent error format never exposes internals
• No secrets in error messages
• No stack traces in production

Audit Trail

All sensitive operations are logged:

• Command creation, acknowledgement, expiration
• Device registration and revocation
• Snapshot conflicts
• No sensitive data (passwords, tokens) in audit logs