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Integrate with Technitium DNS

Support level: Community

What is Technitium DNS​

Technitium DNS Server is a free, open source, cross-platform, authoritative and recursive DNS server that can be self-hosted for privacy and security, software development, and testing on small to medium-sized networks.

-- https://technitium.com/dns/

Preparation​

The following placeholders are used in this guide:

  • technitium.company is the FQDN of the Technitium DNS installation.
  • authentik.company is the FQDN of the authentik installation.

This guide requires Technitium DNS Server version 15.0 or later.

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 Technitium DNS with authentik, you need to create a scope mapping, an application/provider pair, and application entitlements in authentik.

Create a scope mapping in authentik​

Technitium DNS uses the roles claim to map SSO users to local groups. Create a scope mapping to pass authentik application entitlements as role values.

  1. Log in to authentik as an administrator and open the authentik Admin interface.

  2. Navigate to Customization > Property Mappings and click Create.

    • Select type: select Scope Mapping.

    • Configure the Scope Mapping: configure the following settings:

      • Name: provide a descriptive name, such as Technitium DNS roles.
      • Scope name: profile
      • Expression:
      return {
          "roles": [
              entitlement.name
              for entitlement in request.user.app_entitlements(provider.application)
          ],
      }

  3. Click Finish to save the scope mapping.

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 New Application to open the application wizard.

    • 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 Client type to Confidential.
      • Set a Strict redirect URI to https://technitium.company/sso/callback.
      • Select any available signing key.
      • Ensure that the openid, email, and profile scopes are selected. Remove the email scope if you prefer usernames to use the preferred username claim instead of the email address.
      • Under Advanced protocol settings > Selected Scopes, add the scope mapping that you created in the previous section.
    • 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 application entitlements in authentik​

Use application entitlements to represent the Technitium DNS groups that this application should assign.

  1. Open the Technitium DNS application that you just created in the authentik Admin interface.
  2. Click the Application entitlements tab.
  3. Create one entitlement for each Technitium DNS group that users should be able to receive, such as Technitium Admins.
  4. Open each entitlement and bind the users or groups that should receive it.
Entitlement group names

The entitlement names must exactly match the Remote Group values that you configure in the Technitium Group Map.

Technitium configuration​

  1. Log in to the Technitium web console using a local administrator account.
  2. Navigate to Administration > Single Sign-On (SSO).
  3. Select Enable Single Sign-On (SSO).
  4. Configure the following settings:
    • Authority (Issuer): https://authentik.company/application/o/<application_slug>/
    • Client ID: enter the client ID from authentik.
    • Client Secret: enter the client secret from authentik.
    • Metadata Address: https://authentik.company/application/o/<application_slug>/.well-known/openid-configuration
  5. Configure SSO User Sign Up as appropriate:
    • Allow New User Sign Up: enable this to allow automatic provisioning of user accounts for new SSO users.
    • Allow Sign Up Only For Mapped Users: enable this to restrict sign-up to users that belong to a mapped remote group. If enabled, you must configure at least one entry in the Group Map section, otherwise new SSO users cannot sign up.
  6. Configure the Group Map to map authentik application entitlements to local Technitium groups:
    • Remote Group: the name of the authentik application entitlement (e.g. Technitium Admins).
    • Local Group: the corresponding Technitium local group (e.g. Administrators).
Local administrator fallback

It is strongly recommended to keep a local administrator account as a fallback. Any DNS failure could cause SSO to stop working, making it impossible for SSO-only users to log in.

  1. Click Save Config to apply the changes. The web service restarts automatically.

Configuration verification​

To confirm that authentik is properly configured with Technitium DNS, log out of Technitium. Then, navigate to the Technitium login page and click OpenID Connect. You should be redirected to authentik to log in, and if successful, redirected to the Technitium dashboard.

Resources​