authentik/docs/integrations/as-sp/gitlab/index.md

GitLab Integration

GitLab can authenticate against passbook using SAML.

Preparation

The following placeholders will be used:

• gitlab.company is the FQDN of the GitLab Install
• passbook.company is the FQDN of the passbook Install

Create an application in passbook and note the slug, as this will be used later. Create a SAML Provider with the following Parameters:

• ACS URL: https://gitlab.company/users/auth/saml/callback
• Audience: https://gitlab.company
• Issuer: https://gitlab.company

You can of course use a custom Signing Certificate, and adjust the Assertion Length. To get the value for idp_cert_fingerprint, you can use a tool like this.

GitLab Configuration

Paste the following block in your gitlab.rb file, after replacing the placeholder values from above. The file is located in /etc/gitlab.

gitlab_rails['omniauth_enabled'] = true
gitlab_rails['omniauth_allow_single_sign_on'] = ['saml']
gitlab_rails['omniauth_sync_email_from_provider'] = 'saml'
gitlab_rails['omniauth_sync_profile_from_provider'] = ['saml']
gitlab_rails['omniauth_sync_profile_attributes'] = ['email']
gitlab_rails['omniauth_auto_sign_in_with_provider'] = 'saml'
gitlab_rails['omniauth_block_auto_created_users'] = false
gitlab_rails['omniauth_auto_link_saml_user'] = true
gitlab_rails['omniauth_providers'] = [
  {
    name: 'saml',
    args: {
      assertion_consumer_service_url: 'https://gitlab.company/users/auth/saml/callback',
      idp_cert_fingerprint: '4E:1E:CD:67:4A:67:5A:E9:6A:D0:3C:E6:DD:7A:F2:44:2E:76:00:6A',
      idp_sso_target_url: 'https://passbook.company/application/saml/<passbook application slug>/login/',
      issuer: 'https://gitlab.company',
      name_identifier_format: 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress',
      attribute_statements: {
        email: ['urn:oid:1.3.6.1.4.1.5923.1.1.1.6'],
        first_name: ['urn:oid:2.5.4.3'],
        nickname: ['urn:oid:2.16.840.1.113730.3.1.241']
      }
    },
    label: 'passbook'
  }
]

Afterwards, either run gitlab-ctl reconfigure if you're running GitLab Omnibus, or restart the container if you're using the container.