SAML SSO allows people to authenticate and access your GitHub Enterprise Server instance through an external system for identity management.
SAML is an XML-based standard for authentication and authorization. When you configure SAML for your GitHub Enterprise Server instance, the external system for authentication is called an identity provider (IdP). Your instance acts as a SAML service provider (SP). For more information about the SAML standard, see Security Assertion Markup Language on Wikipedia.
For more information about the configuration of SAML SSO on GitHub Enterprise Server, see "Configuring SAML single sign-on for your enterprise."
If you remove a user from your IdP, you must also manually suspend them. Otherwise, the account's owner can continue to authenticate using access tokens or SSH keys. For more information, see "Suspending and unsuspending users".
When using SAML or CAS, two-factor authentication is not supported or managed on the GitHub Enterprise Server appliance, but may be supported by the external authentication provider. Two-factor authentication enforcement on organizations is not available. For more information about enforcing two-factor authentication on organizations, see "Requiring two-factor authentication in your organization."
If you want to allow authentication for some people who don't have an account on your external authentication provider, you can allow fallback authentication to local accounts on your GitHub Enterprise Server instance. For more information, see "Allowing built-in authentication for users outside your provider."
GitHub Enterprise Server supports SAML SSO with IdPs that implement the SAML 2.0 standard. For more information, see the SAML Wiki on the OASIS website.
GitHub officially supports and internally tests the following IdPs.
- Active Directory Federation Services (AD FS)
- Azure Active Directory (Azure AD)
If your IdP supports encrypted assertions, you can configure encrypted assertions on GitHub Enterprise Server for increased security during the authentication process.
GitHub Enterprise Server does not support SAML Single Logout. To terminate an active SAML session, users should log out directly on your SAML IdP.
- SAML Wiki on the OASIS website
- System for Cross-domain Identity Management: Protocol (RFC 7644) on the IETF website