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# Authentication
This page gathers all the resources for the topic **Authentication** within GitLab.
## GitLab users
- [SSH ](../../ssh/README.md )
- [Two-Factor Authentication (2FA) ](../../user/profile/account/two_factor_authentication.md#two-factor-authentication )
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- [Why do I keep getting signed out? ](../../user/profile/index.md#why-do-i-keep-getting-signed-out )
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- **Articles:**
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- [Support for Universal 2nd Factor Authentication - YubiKeys ](https://about.gitlab.com/blog/2016/06/22/gitlab-adds-support-for-u2f/ )
- [Security Webcast with Yubico ](https://about.gitlab.com/blog/2016/08/31/gitlab-and-yubico-security-webcast/ )
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- **Integrations:**
- [GitLab as OAuth2 authentication service provider ](../../integration/oauth_provider.md#introduction-to-oauth )
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- [GitLab as OpenID Connect identity provider ](../../integration/openid_connect_provider.md )
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## GitLab administrators
- [LDAP (Community Edition) ](../../administration/auth/ldap.md )
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- [LDAP (Enterprise Edition) ](../../administration/auth/ldap-ee.md ) ** (STARTER)**
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- [Enforce Two-factor Authentication (2FA) ](../../security/two_factor_authentication.md#enforce-two-factor-authentication-2fa )
- **Articles:**
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- [How to Configure LDAP with GitLab CE ](../../administration/auth/how_to_configure_ldap_gitlab_ce/index.md )
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- [How to Configure LDAP with GitLab EE ](../../administration/auth/how_to_configure_ldap_gitlab_ee/index.md ) ** (STARTER)**
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- [Feature Highlight: LDAP Integration ](https://about.gitlab.com/blog/2014/07/10/feature-highlight-ldap-sync/ )
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- [Debugging LDAP ](https://about.gitlab.com/handbook/support/workflows/debugging_ldap.html )
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- **Integrations:**
- [OmniAuth ](../../integration/omniauth.md )
- [Authentiq OmniAuth Provider ](../../administration/auth/authentiq.md#authentiq-omniauth-provider )
- [Atlassian Crowd OmniAuth Provider ](../../administration/auth/crowd.md )
- [CAS OmniAuth Provider ](../../integration/cas.md )
- [SAML OmniAuth Provider ](../../integration/saml.md )
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- [SAML for GitLab.com Groups ](../../user/group/saml_sso/index.md ) ** (SILVER ONLY)**
- [SCIM user provisioning for GitLab.com Groups ](../../user/group/saml_sso/scim_setup.md ) ** (SILVER ONLY)**
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- [Okta SSO provider ](../../administration/auth/okta.md )
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- [Kerberos integration (GitLab EE) ](../../integration/kerberos.md ) ** (STARTER)**
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## API
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- [OAuth 2 Tokens ](../../api/README.md#oauth2-tokens )
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- [Personal access tokens ](../../api/README.md#personalproject-access-tokens )
- [Project access tokens ](../../api/README.md#personalproject-access-tokens ) ** (CORE ONLY)**
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- [Impersonation tokens ](../../api/README.md#impersonation-tokens )
- [GitLab as an OAuth2 provider ](../../api/oauth2.md#gitlab-as-an-oauth2-provider )
## Third-party resources
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- [Kanboard Plugin GitLab Authentication ](https://github.com/kanboard/plugin-gitlab-auth )
- [Jenkins GitLab OAuth Plugin ](https://wiki.jenkins.io/display/JENKINS/GitLab+OAuth+Plugin )
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- [How to customize GitLab to support OpenID authentication ](http://eric.van-der-vlist.com/blog/2013/11/23/how-to-customize-gitlab-to-support-openid-authentication/ )
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- [OKD - Configuring Authentication and User Agent ](https://docs.okd.io/3.11/install_config/configuring_authentication.html#GitLab )
