Integrate with GitHub Enterprise Server

What is GitHub Enterprise Server

GitHub Enterprise Server is a self-hosted platform for software development within your enterprise. Your team can use GitHub Enterprise Server to build and ship software using Git version control, powerful APIs, productivity and collaboration tools, and integrations. Developers familiar with GitHub.com can onboard and contribute seamlessly using familiar features and workflows.

-- https://docs.github.com/en/[email protected]/admin/overview/about-github-enterprise-server

Preparation

The following placeholders are used in this guide:

• https://github.company is your GitHub Enterprise Server installation
• authentik.company is the FQDN of the authentik installation.
• GitHub Users is an authentik group used for holding GitHub users.
• GitHub Admins is an authentik group used for indicating GitHub administrators.

:::info This documentation lists only the settings that you need to change from their default values. Be aware that any changes other than those explicitly mentioned in this guide could cause issues accessing your application. :::

authentik configuration

To support the integration of GitHub Enterprise Server with authentik, you need to create an application/provider pair in authentik.

:::info In order to use GitHub Enterprise Server, SCIM must also be set up. :::

Create an application and provider in authentik

1. Log in to authentik as an administrator and open the authentik Admin interface.
2. Navigate to Applications > Applications and click Create with Provider to create an application and provider pair. (Alternatively you can first create a provider separately, then create the application and connect it with the provider.)

• Application: provide a descriptive name, an optional group for the type of application, the policy engine mode, and optional UI settings.
• Choose a Provider type: select SAML Provider as the provider type.
• Configure the Provider: provide a name (or accept the auto-provided name), the authorization flow to use for this provider, and the following required configurations.
  • Set the ACS URL to https://github.company/saml/consume.
  • Set the Audience and Issuer to https://github.company.
  • Set the Service Provider Binding to Post.
  • Under Advanced protocol settings, select an available Signing certificate. It is advised to download this certificate as it will be required later. It can be found under System > Certificates in the Admin Interface.
• Configure Bindings (optional): you can create a binding (policy, group, or user) to manage the listing and access to applications on a user's My applications page.

3. Click Submit to save the new application and provider.

Create the users and administrator groups

In the authentik Admin Interface, navigate to Directory > Groups and click Create. Set the group's name, any other desired settings, and click Create. Repeat this step twice: Once for the users group and once for the administrator group.

After creating the groups, select a group, navigate to the Users tab, and manage its members by using the Add existing user and Create user buttons as needed.

SAML Configuration

If you are planning to use SCIM, (available from GHES 3.14.0) you should create a first administrator user on your instance and go to your personal access tokens at https://github.company/settings/tokens/new, click Generate new token and click Generate new token (classic). Your token should have a descriptive name and ideally, no expiration date. For permission scopes, you need to select admin:enterprise. Click Generate token and store the resulting token in a safe location.

To enable SAML, navigate to your appliance maintenance settings. These are found at https://github.company:8443. Here, sign in with an administrator user and go to the Authentication section.

On this page:

• Select the SAML option.
• In Sign on URL, input your SSO URL (Redirect) from authentik.
• For Issuer, use the Audience you set in authentik.
• Verify that the Signature method and Digest method match your SAML provider settings in authentik.
• For Validation certificate, upload the signing certificate you downloaded after creating the provider.
• If you plan to enable SCIM, select Allow creation of accounts with built-in authentication and Disable administrator demotion/promotion options. These are selected so you can use your administrator user as an emergency non-SSO account, as well as create machine users, and to ensure users are not promoted outside your IdP.
• In the User attributes section, enter http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress in the Username field to ensure the emails become normalized into usernames in GitHub.
• Press Save settings on the left-hand side and wait for the changes to apply.

Once the appliance has saved the settings and reloaded the services, you should be able to navigate to your instance URL at https://github.company and sign in with SAML.

SCIM Configuration

This section only applies if you have taken the steps prior to prepare the instance for SCIM enablement.

After enabling SAML, log into your initial administrator account again. Click the user portrait in tee top right, click Enterprise settings, click Settings in the left-hand sidebar, click Authentication security. On this page you have to check Enable SCIM configuration and press Save. After which you should get a message reading SCIM Enabled.

Before we create a SCIM provider, we have to create a new Property Mapping. In authentik, go to Customization, then Property Mappings. Here, click Create, select SCIM Provider Mapping. Name the mapping something memorable and paste the following code in the Expression field:

roles = []
# Edit this if statement if you need to add more GitHub roles.
# Valid roles include:
# user, guest_collaborator, enterprise_owner, billing_manager
if ak_is_group_member(request.user, name='GitHub Admins'):
    roles.append({'value': 'enterprise_owner', 'primary': True})
else:
    roles.append({'value': 'user', 'primary': True})

return {
    "roles": roles,
}

If you named your group anything other than GitHub Admins, please ensure you change it in the code above.

Create a new SCIM provider with the following parameters:

• URL: https://github.company/api/v3/scim/v2
• Token: Paste the token you generated earlier here.
• In the User filtering section, you can select your GitHub Users group.
• In the Attribute mapping section, de-select the authentik default SCIM Mapping: User mapping from the User Property Mappings by selecting it on the right-hand side and clicking the left-facing single chevron.
• Select the property mapping you created in the previous step and add it by clicking the right-facing single chevron.
• Ensure that authentik default SCIM Mapping: Group is the only one active in the Group Property Mappings.
• Click Finish.

Go back to your GitHub Enterprise Server Application created in the first step and add your new SCIM provider in the Backchannel Providers field, then click the Update button.

You should now be ready to assign users to your GitHub Users and GitHub Admins groups, which will be provisioned by the SCIM provisioner. If you do not see your users being provisioned, go to your SCIM provider and click the Run sync again option. A few seconds later, you should see results of the SCIM sync.