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# Authentication and Authorization
GitLab integrates with the following external authentication and authorization
providers.
- [LDAP](ldap.md) Includes Active Directory, Apple Open Directory, Open LDAP,
and 389 Server
- [LDAP for GitLab EE](ldap-ee.md): LDAP additions to GitLab Enterprise Editions **(STARTER ONLY)**
- [OmniAuth](../../integration/omniauth.md) Sign in via Twitter, GitHub, GitLab.com, Google,
Bitbucket, Facebook, Shibboleth, Crowd, Azure, Authentiq ID, and JWT
- [CAS](../../integration/cas.md) Configure GitLab to sign in using CAS
- [SAML](../../integration/saml.md) Configure GitLab as a SAML 2.0 Service Provider
- [Okta](okta.md) Configure GitLab to sign in using Okta
- [Authentiq](authentiq.md): Enable the Authentiq OmniAuth provider for passwordless authentication
- [Smartcard](smartcard.md) Smartcard authentication **(PREMIUM ONLY)**
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