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---
comments: false
type: index
stage: Manage
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group: Authentication and Authorization
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# GitLab authentication and authorization **(FREE SELF)**
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GitLab integrates with a number of [OmniAuth providers ](../../integration/omniauth.md#supported-providers ),
and the following external authentication and authorization providers:
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- [LDAP ](ldap/index.md ): Includes Active Directory, Apple Open Directory, Open LDAP,
and 389 Server.
- [Google Secure LDAP ](ldap/google_secure_ldap.md )
- [SAML for GitLab.com groups ](../../user/group/saml_sso/index.md ) ** (PREMIUM SAAS)**
- [Smartcard ](smartcard.md ) ** (PREMIUM SELF)**
NOTE:
UltraAuth has removed their software which supports OmniAuth integration. We have therefore removed all references to UltraAuth integration.
## SaaS vs Self-Managed Comparison
The external authentication and authorization providers may support the following capabilities.
For more information, see the links shown on this page for each external provider.
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| Capability | SaaS | Self-managed |
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|-------------------------------------------------|-----------------------------------------|------------------------------------|
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| **User Provisioning** | SCIM< br > SAML < sup > 1</ sup > | LDAP < sup > 1</ sup >< br > SAML < sup > 1</ sup >< br > [OmniAuth Providers](../../integration/omniauth.md#supported-providers) < sup > 1</ sup > |
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| **User Detail Updating** (not group management) | Not Available | LDAP Sync |
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| **Authentication** | SAML at top-level group (1 provider) | LDAP (multiple providers)< br > Generic OAuth2< br > SAML (only 1 permitted per unique provider)< br > Kerberos< br > JWT< br > Smartcard< br > [OmniAuth Providers](../../integration/omniauth.md#supported-providers) (only 1 permitted per unique provider) |
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| **Provider-to-GitLab Role Sync** | SAML Group Sync | LDAP Group Sync< br > SAML Group Sync ([GitLab 15.1](https://gitlab.com/gitlab-org/gitlab/-/issues/285150) and later) |
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| **User Removal** | SCIM (remove user from top-level group) | LDAP (remove user from groups and block from the instance) |
1. Using Just-In-Time (JIT) provisioning, user accounts are created when the user first signs in.
