AI agent skill · by @aiming-lab

Auth And Authorization Patterns

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.

Archived 2026-10-23 · Source updated 2026-06-07 · License: MIT. Check the original repository for the latest version.

SKILL.md instructions

# 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.