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Integrate with Semaphore UI

Support level: Community

What is Semaphore UI​

Semaphore UI is a modern web interface for managing popular DevOps tools.

-- https://semaphoreui.com/

This guide explains how to configure Semaphore UI to use authentik as the OAuth provider for logging in to the Web GUI.

Preparation​

The following placeholders are used in this guide:

  • semaphore.company is the FQDN of the Semaphore installation.
  • authentik.company is the FQDN of the authentik installation.
note

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 Semaphore with authentik, you need to create an application/provider pair in authentik.

Create an application and provider in authentik​

  1. Log in to authentik as an admin, 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 OAuth2/OpenID Connect 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.
    • Note the Client ID,Client Secret, and slug values because they will be required later.
    • Set a Strict redirect URI to https://semaphore.company/api/auth/oidc/authentik/redirect.
    • Select any available signing key.
  • 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.
  1. Click Submit to save the new application and provider.

Semaphore UI configuration​

Log in to your Semaphore UI host via SSH. Edit the /etc/semaphore/config.json file with the text editor of your choice.

Add the oidc_providers configuration:

{
  "oidc_providers": {
    "authentik": {
      "display_name": "Sign in with authentik",
      "provider_url": "https://authentik.company/application/o/<slug>/",
      "client_id": "<client-id>",
      "client_secret": "<client-secret>",
      "redirect_url": "https://semaphore.company/api/auth/oidc/authentik/redirect/",
      "username_claim": "username",
      "name_claim": "name",
      "email_claim": "email",
      "scopes": ["openid", "profile", "email"]
    }
  },
  ...
}
info

The name of the oidc_provider (e.g. authentik) needs to match the name on the redirect URL.

info

If a Not Found error is displayed after the login, you might need to set the web_root to / (see https://github.com/semaphoreui/semaphore/issues/2681):

SEMAPHORE_WEB_ROOT: /

More information on this can be found in the Semaphore documentation https://docs.semaphoreui.com/administration-guide/openid/authentik/.

Test the login​

  • Open a browser of your choice and open the URL https://semaphore.company.
  • Click on the SSO-Login button.
  • You should be redirected to authentik (with the login flows you created) and then authentik should redirect you back to https://semaphore.company URL.
  • If you are redirected back to the https://semaphore.company URL you did everything correct.
info

Users are created upon logging in with authentik. They will not have the rights to create anything initially. These permissions must be assigned later by the local admin created during the first login to the Semaphore UI.