Authentication and authorization are the two doors between your business and the world, and most breaches are not dramatic zero-days — they are doors left on the latch. Weak password handling, tokens stored in the wrong place, and session lifetime decisions made casually are the recurring themes of incident reports. This is the design checklist we apply to every login we ship.

Passwords: Hashing Is Non-Negotiable

Store only salted, adaptive hashes. Argon2id where available, bcrypt with a sensible cost otherwise — and use the framework's native abstraction (Laravel's Hash facade) so the algorithm can be upgraded without rewriting call sites. Never invent your own scheme, never use a reversible cipher, and enforce breach-list checks on signup: if a password has appeared in a known breach, ask the user to choose another.

Multi-Factor: Baseline, Not Luxury

TOTP-based MFA is cheap and effective; WebAuthn and passkeys are the direction of travel for 2026. Roll out MFA as a baseline for any account with financial or administrative power, and provide recovery codes at setup — the moment a user loses their second factor is the moment support cost doubles. Never require MFA on every low-stakes action; require it proportionally to the damage the account can do.

Sessions vs Tokens: Choose by Trade-off

Server-side sessions with httpOnly cookies give you revocation, central control, and CSRF protection out of the box — the right default for web apps. Stateless JWTs trade those properties for portability across mobile and third-party contexts, but they cannot be revoked before expiry and must be short-lived. If you must use JWTs, keep them small, sign them properly, store them in secure client storage, and refresh them aggressively with rotation.

Authorization: RBAC First, ABAC When Needed

Authorization is the more important half and the more neglected one. Start with role-based access control at the resource boundary, then layer attribute-based rules for data-level constraints — a user can edit only their own invoices. Enforce authorization in the backend on every endpoint; never rely on hiding UI buttons, because the API does not care what the button shows. Write a failing test for every denied path.

The OAuth 2.0 + PKCE Flow for Third Parties

When exposing your API to other apps, use OAuth 2.0 with PKCE for public clients. The flow: the client starts at your authorize endpoint, receives a code, and exchanges it for tokens using a proof key that was sent at the start. This closes the interception hole that the implicit flow left open. Issue scoped, expiring tokens and let users review and revoke third-party access from a settings page.

Security Headers and Rate Limiting

Layer the browser defenses: Content-Security-Policy, X-Content-Type-Options, Referrer-Policy, and a strict SameSite cookie policy. Add login rate limiting with exponential backoff and account lockout after a threshold, and log every authentication event with IP and user agent so a credential-stuffing run is visible in your metrics, not a mystery in your incident review.

The Authentication Deployment Checklist

  • Argon2id or bcrypt hashes; no plaintext, no reversibility.
  • MFA baseline for admin and financial roles, with recovery codes.
  • httpOnly, Secure, SameSite cookies for web sessions.
  • Short-lived tokens with refresh rotation for stateless flows.
  • RBAC plus ABAC enforced server-side on every endpoint.
  • CSP, security headers, rate limiting, and auth logging enabled.

Security is a property of the design, not a feature bolted on after launch. Smart Logic builds Laravel authentication and authorization — from passwordless logins and OAuth provider integrations to granular RBAC — as an engineered layer, not a default package. If you want your login surface audited or a modern auth stack designed for your product, our full-stack team is ready to run the security review.