# LL::NG as federation protocol proxy

LL::NG can use federation protocols (SAML, CAS, OpenID) independently to:

- authenticate users
- provide identities to other systems

So you can configure it to authenticate users using a federation protocol and simultaneously to provide identities using other(s) federation protocols.

Schemes tested:

- SAML / OpenID-Connect:
  - SAML-SP <=> LLNG as SAML/OpenID-Connect proxy <=> OIDC Provider
  - OIDC-RP <=> LLNG as OpenID-Connect/SAML proxy <=> SAML Identity Provider
- SAML / CAS
  - SAML-SP <=> LLNG as SAML/CAS proxy <=> CAS Server
  - CAS Application <=> LLNG as CAS/SAML proxy <=> SAML Identity Provider

Note that OpenID-Connect consortium hasn't already defined single-logout initiated by OpenID-Connect Provider. LLNG will implement it when this standard will be published.

Federation proxy installation can be complex. Don't hesitate to contact us on lemonldap-ng-users@ow2.org

See the following chapters:

- Authentication protocols
- Identity provider