# Configuring SSO

OpenIAM supports **single sign-on (SSO)** for connected applications.

You can configure SSO in two ways:

* **Federation protocols** such as **SAML 2.0**, **OAuth 2.0**, and **OpenID Connect (OIDC)**
* [**Reverse proxy**](/sso-to-legacy-applications.md) for legacy applications

Federation is the most common SSO model in OpenIAM. It lets applications trust OpenIAM for authentication and token issuance.

### Federation protocols

Use federation when your application supports standard identity protocols.

* [OAuth 2.0](/federation/oidc-and-oauth-integration.md) — use this for delegated authorization and API access.
* [OIDC and OAuth integration](/federation/oidc-and-oauth-integration.md) — use this when the application needs both authentication and OAuth-based access.

### Reverse proxy

Use reverse proxy for older applications that do not support modern federation protocols.

### Choose the right model

* Use **SAML 2.0** for enterprise SSO integrations.
* Use **OAuth 2.0** for API authorization.
* Use **OIDC** when the application needs user authentication on top of OAuth 2.0.


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