# 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)

- [Why do I keep getting signed out?](../../user/profile/index.md#why-do-i-keep-getting-signed-out)

- **Articles:**
  - [Support for Universal 2nd Factor Authentication - YubiKeys](https://about.gitlab.com/2016/06/22/gitlab-adds-support-for-u2f/)
  - [Security Webcast with Yubico](https://about.gitlab.com/2016/08/31/gitlab-and-yubico-security-webcast/)
- **Integrations:**

  - [GitLab as OAuth2 authentication service provider](../../integration/oauth_provider.md#introduction-to-oauth)

  - [GitLab as OpenID Connect identity provider](../../integration/openid_connect_provider.md)

## GitLab administrators

- [LDAP (Community Edition)](../../administration/auth/ldap.md)

- [LDAP (Enterprise Edition)](https://docs.gitlab.com/ee/administration/auth/ldap-ee.html)

- [Enforce Two-factor Authentication (2FA)](../../security/two_factor_authentication.md#enforce-two-factor-authentication-2fa)
- **Articles:**

  - [How to Configure LDAP with GitLab CE](../../administration/auth/how_to_configure_ldap_gitlab_ce/index.md)

  - [How to Configure LDAP with GitLab EE](https://docs.gitlab.com/ee/articles/how_to_configure_ldap_gitlab_ee/)

  - [Feature Highlight: LDAP Integration](https://about.gitlab.com/2014/07/10/feature-highlight-ldap-sync/)

  - [Debugging LDAP](https://about.gitlab.com/handbook/support/workflows/ldap/debugging_ldap.html)

- **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)
  - [Okta SSO provider](../../administration/auth/okta.md)

  - [Kerberos integration (GitLab EE)](https://docs.gitlab.com/ee/integration/kerberos.html)

## API

- [OAuth 2 Tokens](../../api/README.md#oauth-2-tokens)
- [Private Tokens](../../api/README.md#private-tokens)

- [Impersonation tokens](../../api/README.md#impersonation-tokens)

- [GitLab as an OAuth2 provider](../../api/oauth2.md#gitlab-as-an-oauth2-provider)

## Third-party resources

- [Kanboard Plugin GitLab Authentication](https://kanboard.net/plugin/gitlab-auth)

- [Jenkins GitLab OAuth Plugin](https://wiki.jenkins-ci.org/display/JENKINS/GitLab+OAuth+Plugin)
- [Setup Gitlab CE with Active Directory authentication](https://www.caseylabs.com/setup-gitlab-ce-with-active-directory-authentication/)
- [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/)
- [Openshift - Configuring Authentication and User Agent](https://docs.openshift.org/latest/install_config/configuring_authentication.html#GitLab)