auth

Auth — Authentication & Authorization

Activate When

• User invokes /godmode:auth
• User says "authentication", "login flow", "OAuth setup", "JWT tokens", "session management"
• User says "MFA", "two-factor", "passwordless", "social login", "SSO"
• Building features that require user identity or access control
• Integrating with identity providers (Auth0, Okta, Cognito, Keycloak, Firebase Auth)
• Pre-ship check when /godmode:secure detects authentication weaknesses
• Designing API authentication for /godmode:api endpoints

Workflow

Step 1: Identity Requirements Discovery

Determine the authentication and authorization needs:

IDENTITY REQUIREMENTS:
Application type: <SPA | SSR | Mobile | API-only | Microservices | Hybrid>
User populations:

Step 2: Auth Strategy Selection

Select and design the authentication strategy based on requirements:

Strategy: JWT (JSON Web Tokens)

For stateless API authentication:

JWT DESIGN:
Algorithm: RS256 (asymmetric) | ES256 (ECDSA) | HS256 (symmetric, single-service only)
Access token:

Strategy: OAuth 2.0 / OpenID Connect

For delegated authentication and third-party integration:

OAUTH2 / OIDC DESIGN:
Grant types:
  - [ ] Authorization Code + PKCE (SPAs, mobile, server apps — RECOMMENDED)

Strategy: SAML 2.0

For enterprise SSO federation:

SAML DESIGN:
Role: Service Provider (SP)
Identity Provider: <Okta | Azure AD | ADFS | OneLogin | custom>

API KEY DESIGN: Format: Prefixed key (e.g., sk_live_abc123, pk_test_xyz789) Prefix: Environment indicator (live/test) + type (secret/publishable) Entropy: 32+ bytes of cryptographic random, base62 encoded Length: 40-64 characters total

Storage: Server-side: Store HASH only (SHA-256 or bcrypt), never plaintext Display: Show only last 4 characters after creation (sk_live_...a1b2) Lookup: Use prefix + hash index for efficient lookup

Lifecycle: Creation: User generates via dashboard/API, shown ONCE Rotation: Support key rotation with overlap period (old key valid for 24h) Revocation: Immediate revocation via dashboard/API Expiry: Optional expiry date, default no expiry with activity monitoring

Scoping:

Strategy: mTLS (Mutual TLS)

For zero-trust service-to-service authentication:

mTLS DESIGN:
Certificate authority: <internal CA | HashiCorp Vault | AWS ACM PCA | cfssl>
Certificate format: X.509 v3

SESSION MANAGEMENT: Type: Stateless (JWT) | Stateful (server-side sessions) | Hybrid

Stateless sessions (JWT-based): Advantages: No server-side storage, horizontal scaling Disadvantages: Cannot revoke individual tokens, payload size Mitigation: Short-lived access tokens + refresh token rotation Revocation strategy: - Token blacklist in Redis (TTL = remaining token lifetime) - Refresh token family tracking (revoke family on reuse detection) - Version counter on user record (invalidate all tokens on password change)

Stateful sessions (server-side): Store: Redis | PostgreSQL | DynamoDB Session ID: 256-bit cryptographic random, base64url encoded Idle timeout: 30min, absolute timeout: 12h, sliding window reset on request Concurrent limit: per user. Regenerate ID after auth. Destroy on logout. Cookie: __Host-session, HttpOnly, Secure, SameSite=Lax, no Domain set

SECURITY CHECKLIST:

• Session ID is cryptographically random (256+ bits)
• Session ID regenerated after login (prevent fixation)
• Session destroyed on logout (server-side + cookie cleared)
• Idle timeout enforced server-side
• Absolute timeout enforced (even active sessions expire)
• Concurrent session limit enforced
• Session bound to user-agent and IP (detect hijacking)
• Cookie flags: HttpOnly, Secure, SameSite

### Step 4: Multi-Factor Authentication (MFA)
Design MFA implementation if required:

MFA DESIGN: Enrollment flow: Registration -> Verify first factor -> Enroll MFA -> Verify MFA Authentication flow: Password -> MFA challenge -> Session created

Supported factors:

• TOTP (Authenticator app — Google Authenticator, Authy, 1Password) Algorithm: SHA-1 (RFC 6238 compatible) Digits: 6 Period: 30 seconds Secret: 160-bit random, base32 encoded Provisioning: otpauth:// URI + QR code Backup: 8-10 single-use recovery codes (16 chars each, stored hashed)

• WebAuthn / Passkeys (FIDO2) Relying Party ID: <your-domain.com> Attestation: none (privacy-preserving) | direct (hardware verification) User verification: preferred (biometric if available) Resident keys: preferred (discoverable credentials for passwordless) Authenticators: Platform (TouchID, FaceID, Windows Hello) + Roaming (YubiKey) Credential storage: credentialId + publicKey + signCount per user

• SMS OTP (FALLBACK ONLY — vulnerable to SIM swap) Code: 6-digit random Expiry: 5 minutes Rate limit: 3 attempts per code, 5 codes per hour WARNING: NIST SP 800-63B deprecated SMS for authentication

• Email magic link Token: 256-bit random, single-use Expiry: 15 minutes Rate limit: 5 links per hour

Step 5: Passwordless Authentication

Design passwordless flows if required:

PASSWORDLESS DESIGN:

Strategy: Magic Links

TOKEN LIFECYCLE: TOKEN LIFECYCLE ISSUANCE ├─ User authenticates (password + MFA) ├─ Generate access token (short-lived: 15min) ├─ Generate refresh token (long-lived: 7-30 days) ├─ Store refresh token hash in database └─ Return tokens to client USAGE ├─ Client sends access token on every request ├─ Server validates signature, expiry, audience, issuer ├─ Server extracts claims (userId, roles, permissions) └─ Request proceeds or is rejected (401/403) REFRESH ├─ Access token expires -> client sends refresh token ├─ Server validates refresh token hash against database ├─ Server issues NEW access token + NEW refresh token ├─ Server invalidates OLD refresh token (rotation) └─ If old refresh token is reused -> revoke entire family REVOCATION ├─ User logout: Delete refresh token from database ├─ Password change: Revoke ALL refresh tokens for user ├─ Security event: Revoke ALL tokens for user ├─ Admin action: Revoke specific session or all sessions └─ Access token: Add to blacklist (Redis, TTL = remaining) CLEANUP ├─ Expired refresh tokens: Cron job deletes daily ├─ Blacklist entries: Auto-expire via Redis TTL └─ Audit log: Retain token events for compliance period

Token storage by client type:

Client Type	Access Token	Refresh Token
SPA	In-memory only	HttpOnly cookie (Secure)
SSR (Next.js)	Server memory	HttpOnly cookie (Secure)
Mobile app	Secure keychain	Secure keychain
Server/CLI	Environment var	Encrypted file / vault
Microservice	In-memory cache	N/A (client credentials)

### Step 7: Social Login Integration
Design social authentication if required:

SOCIAL LOGIN DESIGN:

Provider	Protocol	Scopes	User Data
Google	OIDC	openid email profile	email, name
GitHub	OAuth2	user:email	email, name
Apple	OIDC	openid email name	email, name
Microsoft	OIDC	openid email profile	email, name
Facebook	OAuth2	email public_profile	email, name

Account linking strategy: Primary key: Email address (verified by provider) On first login: - Email matches existing account -> Link social identity - Email is new -> Create account + link social identity On subsequent login:

Step 8: Implementation Artifacts

Generate the authentication implementation:

IMPLEMENTATION ARTIFACTS:
| File | Purpose |

Step 9: Security Hardening Checklist

Final security review of the authentication system:

AUTH SECURITY HARDENING:
| Category | Control | Status |

Step 10: Auth Architecture Report

  AUTH ARCHITECTURE REPORT

Step 11: Commit and Transition

1. Save architecture as docs/auth/<feature>-auth-architecture.md
2. Commit: "auth: <feature> — <strategy> with <MFA type>, <N> endpoints"
3. If INCOMPLETE: "Auth design needs additional work. Address remaining items, then re-run /godmode:auth."
4. If PRODUCTION READY: "Authentication architecture complete. Run /godmode:rbac to design access control, or /godmode:build to implement."

Quality Targets

• Access token TTL: <15min
• Auth round-trip: <500ms latency
• Secrets exposure: 0% plaintext in codebase

Key Behaviors

Never ask to continue. Loop autonomously until all auth flows pass and security checklist is complete.

# Test auth flows end-to-end
npm test -- --grep "auth"
npx jest tests/auth/ --coverage --coverageThreshold='{"global":{"branches":80}}'

IF access token TTL > 15 minutes: reduce to <= 15 min. WHEN login failures > 5 per account per hour: trigger rate limit. IF password hash cost factor < 12: increase to >= 12 (bcrypt).

1. Security by default. Most secure option unless justified.
2. Strategy must match architecture. JWT for stateless, sessions for SSR.
3. Token lifecycle non-negotiable. Issue, validate, refresh, revoke, cleanup.
4. MFA not optional for production. Minimum: TOTP support.
5. Social login = account linking. Not account creation.
6. Show the code. Artifacts, not just diagrams.
7. Password: Argon2id or bcrypt (cost >= 12). No exceptions.

Auth Flow Audit Loop

auth_flows = [session, token, oauth, mfa, password_reset, social, api_key]
FOR each flow:
  KEEP if: exploitable weakness with code evidence
  DISCARD if: not applicable to chosen strategy OR already remediated

Output Format

  AUTH RESULT
  Strategy: <JWT | Session | OAuth2/OIDC | SAML | Hybrid>
  MFA: <TOTP | WebAuthn | SMS | None>
  Endpoints: <N designed/implemented>
  Security controls: <N passed> / <N total>
  Verdict: <PRODUCTION READY | NEEDS HARDENING | INCOMPLETE>

TSV Logging

timestamp	feature	strategy	mfa_type	endpoints	controls_passed	controls_total	verdict

Append one row per invocation. Never overwrite previous rows.

PASS if ALL of the following:
  - Password hashing uses Argon2id or bcrypt (cost >= 12)
  - Access tokens are short-lived (<= 15 min)
  - Refresh tokens use rotation with family-based revocation
  - Token storage follows client-type recommendations (no localStorage for JWTs)
  - HTTPS enforced with HSTS header

Keep/Discard

KEEP if: improvement verified. DISCARD if: regression or no change. Revert discards immediately.

Stop Conditions

Stop when: target reached, budget exhausted, or >5 consecutive discards.