Citrix Gateway RADIUS Integration with AuthPoint

Deployment Overview

This document describes how to set up multi-factor authentication (MFA) for Citrix Gateway with AuthPoint as an identity provider. Citrix Gateway must already be configured and deployed before you set up MFA with AuthPoint.

Citrix Gateway can be configured to support MFA in several modes. For this integration, we configure Citrix Gateway to use the PAP authentication protocol to authenticate local AuthPoint users.

To authenticate users synced from Active Directory or an LDAP database, you must configure Citrix Gateway to use the MS-CHAPv2 authentication protocol and enable MS-CHAPv2 for your RADIUS resource in AuthPoint. You must also configure NPS.

To use RADIUS authentication with Citrix Gateway, you must install and configure the AuthPoint Gateway. The AuthPoint Gateway functions as a RADIUS server and must be installed somewhere on your network that has Internet access and that can connect to your RADIUS clients. For more information, see About Gateways.

This integration was tested with NS11.1: Build 57.11.nc of Citrix Gateway.

Citrix Gateway Authentication Data Flow with AuthPoint

AuthPoint communicates with various cloud-based services and service providers with the RADIUS protocol. This diagram shows the data flow of an MFA transaction for a Citrix Gateway.

Before You Begin

Before you begin these procedures, make sure that:

  • End-users can log in to Citrix Gateway
  • A token is assigned to a user in AuthPoint

Configure Citrix Gateway

Create a RADIUS Authentication Policy and Server

  1. Log in to the Citrix Gateway administrator web console
  2. Select the Configuration tab.

  1. Select NetScaler Gateway > Policies > Authentication > RADIUS.
  2. Click Add.
  3. In the Name text box, type a name for the policy.

  1. Next to the Server text box, click +.
  2. In the Name text box, type a name for the server.
  3. Select Server IP.
  4. In the IP Address text box, type the IP address of the AuthPoint Gateway.
  5. In the Port text box, type the port for the AuthPoint Gateway. The default port for the Gateway is 1812.
  6. In the Secret Key and Confirm Secret Key text boxes, type a shared secret.
  7. In the Time-out text box, type 30.
  8. Click Create.

  1. From the Saved Policy Expressions drop-down list, select ns_true.

  1. Click Create.

Bind RADIUS to the Virtual Server

  1. Select the Configuration tab.

  1. Select NetScaler Gateway > Virtual Servers.
  2. Select the virtual servers created in XenApp and XenDesktop setup.
  3. Click Edit.
  4. Next to Basic Authentication, click +.

  1. From the Choose Policy drop-down list, select RADIUS.
  2. From the Choose Type drop-down list, select Primary. Click Continue.

  1. In the Policy Binding section, next to Select Policy click >.

  1. Select the RADIUS policy that you created.
  2. Click Select.

  1. Click Bind.

Create a RADIUS Authentication User

  1. Select the Configuration tab.
  2. Select NetScaler Gateway > User Administration > AAA Users.
  3. Click Add.
  4. In the User Name text box, type a user name. This user name must be the same as an AuthPoint user name.
  5. Select the External Authentication check box.
  6. Click OK.

  1. Click Done

Configure AuthPoint

Before AuthPoint can receive authentication requests from Citrix Gateway, you must specify the Citrix Gateway client as a RADIUS resource in AuthPoint. You must also assign the Citrix Gateway resource to the user group that will authenticate through Citrix Gateway.

Add a Citrix Gateway Resource in AuthPoint

From the AuthPoint management UI:

  1. From the navigation menu, select Resources.
  2. From the Choose a Resource Type drop-down list, select RADIUS Client. Click Add Resource.

  1. In the Name text box, type a descriptive name for the resource. In our example, we name the resource Citrix Gateway.
  2. In the RADIUS client trusted IP or FQDN text box, type the IP address that your RADIUS client uses to send RADIUS packets to the AuthPoint Gateway. This must be a private IP address.
  3. From the Value sent for RADIUS attribute 11 (Filter-Id) drop-down list, specify what is sent for the attribute 11 (Filter-ID) value in RADIUS responses. You can choose to send the user's AuthPoint group or the user's Active Directory groups.
  4. In the Shared Secret text box, type the password that the RADIUS server (AuthPoint Gateway) and the RADIUS client will use to communicate.
  5. Click Save.

Add an Access Policy to AuthPoint

You must have at least one user group in AuthPoint for authentication with Citrix Gateway, and you must assign an access policy for the Citrix Gateway resource to that group. If you already have a group, you do not have to add another group.

In the AuthPoint management UI:

  1. From the navigation menu, select Groups.
  2. To add a new group, click Add Group. If you already have a group that you want to use, click the Name of your group to edit it.

  1. In the Name text box, type a descriptive name for the group.
  2. (Optional) In the Description text box, type a description of the group.

  1. In the Access Policy section, click Add Policy.

  1. In the Add Policy dialog box, from the Resource drop-down list, select the resource you want to add an access policy for.
  2. (Optional) To require that users type their password before they authenticate for this resource, select the Require Password Authentication toggle.
  3. Select the authentication options users in this group can choose from when they authenticate.

    For RADIUS resources, you can only choose OTP or Push. RADIUS resources cannot use the QR code authentication option.

  1. Click Add.
    The access policy for your resource is added to the list.

  1. Click Save.

Bind the RADIUS Resource to a Gateway

To use RADIUS authentication with AuthPoint, you must have the AuthPoint Gateway installed on your corporate network and you must assign your RADIUS resources to the Gateway in the AuthPoint management UI. The Gateway functions as a RADIUS server.

If you have not already configured and installed the AuthPoint Gateway, see About Gateways.

To assign your RADIUS resources to the Gateway:

  1. From the navigation menu, select Gateway.
  2. Select the Name of the Gateway.
  3. In the RADIUS section, in the Port text box, type the port number used to communicate with the Gateway. The default ports are 1812 and 1645.
  4. In the Select a RADIUS resource drop-down list, select your RADIUS client resource.
  5. Click Save.

Add Users to AuthPoint

Before you assign users to a group, you must add the users to AuthPoint. There are two ways to add AuthPoint user accounts:

  • Sync users from an external user database
  • Add local AuthPoint users

Each user must be a member of a group. You must add at least one group before you can add users to AuthPoint.

Test the Integration

To test the integration of AuthPoint and configuration of your Citrix Gateway, you can authenticate with a mobile token on your mobile device. For RADIUS resources, you can choose one-time password (OTP) or push.

In this example, we show the one-time password authentication method.

  1. In a web browser, go to the virtual server login page
  2. Type your AuthPoint user name and password.
  3. Click Log On.
  4. Approve the authentication request that is sent to your mobile device.
    You are logged in through Citrix Gateway Gateway.