auth-and-authorization-patterns: Скилл для аутентификации и авторизации

--- name: auth-and-authorization-patterns description: Use this skill when implementing authentication (login, token issuance) or authorization (access control, permissions). Apply whenever the task involves login flows, JWT, OAuth2, session management, or RBAC. category: security --- # Auth & Authorization Patterns **Authentication (who are you?):** - Use a battle-tested library — do not roll your own crypto. - Hash passwords with bcrypt/argon2; never MD5/SHA1 for passwords. - Use short-lived JWTs (15–60 min) with refresh tokens; store refresh tokens securely. - Implement MFA for sensitive operations. **Authorization (what can you do?):** - Check authorization on every request, not just at login. - Enforce RBAC or ABAC at the service layer, not the UI. - Apply principle of least privilege: grant minimal permissions needed. **OAuth2 / OIDC:** - Use the Authorization Code flow with PKCE for user-facing apps. - Validate `iss`, `aud`, `exp`, and `nonce` claims on every token. **Session management:** - Regenerate session ID after login (session fixation prevention). - Set `HttpOnly` and `Secure` flags on session cookies.