SAML Single Sign-On
SAML single sign-on (SSO) is an XML-based federation protocol where an identity provider (IdP) authenticates the user and sends a signed SAML assertion to a service provider (SP). The SP trusts the assertion to create a session without handling the user password directly.
Technical Architecture & Deep-Dive
SAML remains common in enterprise SaaS, especially for workforce apps that integrate with Okta, Azure AD, or Ping. The SP publishes an ACS URL, the IdP signs assertions with its private key, and the SP validates signatures against published metadata.
Misconfigurations include weak signature validation, accepting unsigned assertions, or trusting assertions without audience restrictions. Edge gateways can broker SAML to OAuth for modern APIs, validate clocks skew, and map SAML attributes into short-lived API tokens instead of long-lived SP sessions in every microservice.
Key Architectural Benefits
Implement SAML Single Sign-On at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:Is SAML the same as OAuth for API access?
No. SAML targets browser SSO with XML assertions. OAuth issues bearer tokens for API access. Many products use SAML for login and OAuth or OIDC for APIs.
Related Architecture Concepts
Single sign-on (SSO) lets a user authenticate once with an identity provider and access multiple applications without signing in again. SSO protocols such as SAML, OpenID Connect, and Kerberos exchange trust artifacts that downstream apps validate to create local sessions.
Federated identity lets applications trust user authentication performed by an external identity provider instead of storing local passwords. Protocols such as SAML, OpenID Connect, and SCIM provisioning exchange trusted assertions, tokens, and directory attributes.
OAuth 2.0 is an authorization framework that lets an application obtain limited access to a user account on another service without handling the user password. The user approves requested scopes, and the application receives an access token it uses to call the service API.
OpenID Connect (OIDC) is an identity layer built on OAuth 2.0 that lets applications verify who a user is. Alongside an access token, the identity provider issues a signed ID token, a JWT containing claims such as the user ID, email, and authentication time.
Ready-to-Use Edge Recipes
To solve call clerk backend api from client side, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To combine firebase auth user with supabase profile endpoint, use one RealComposer pipeline with parallel steps. Firebase ID token lookup and Supabase profile row merged at edge. Your React / Flutter / Mobile app makes one request instead of several sequential upstream calls.
To stitch firebase with clerk session bootstrap, use one RealComposer pipeline with parallel steps. Clerk session and Firebase FCM registration merged at startup. Your React Native app makes one request instead of several sequential upstream calls.