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OpenVPN Access Server Integration with AuthPoint

Deployment Overview

This document describes how to set up multi-factor authentication (MFA) for OpenVPN Access Server with AuthPoint as an identity provider.

Your OpenVPN Access Server must already be configured and deployed before you set up MFA with AuthPoint. OpenVPN Access Server can be configured to support MFA in several modes. For this integration, we set up RADIUS authentication with AuthPoint.

This integration was tested with version 2.1.9 of OpenVPN Access Server.

OpenVPN Access Server 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 OpenVPN Access Server.

Before You Begin

Before you begin these procedures, make sure that:

  • You have installed and configured the AuthPoint Gateway
  • You have chosen a shared secret key
  • End-users can log in to the OpenVPN Access Server
  • A token is assigned to a user in AuthPoint
  • You have installed the OpenVPN client application

Configure OpenVPN Access Server

Configure RADIUS Server

To use RADIUS authentication with OpenVPN Access Server, you must configure the RADIUS server (AuthPoint Gateway).

  1. Log in to the OpenVPN Access Server web UI at https://<IP address of OpenVPN Access Server:943>.
  2. Select Authentication > RADIUS.

  1. In the Hostname or IP Address text box, type the IP address of the AuthPoint Gateway (RADIUS server).
  2. In the Shared Secret text box, type a shared secret key for OpenVPN to use for communication with AuthPoint.
  3. Click Save Settings.

  1. Click Use RADIUS to select RADIUS for authentication users.
  2. Click Update Running Server.

Configure VPN Server Settings

  1. Select Configuration > VPN Settings.
  2. In the Dynamic IP Address Network section, in the Network Address text box, type the IP address for VPN clients to use if a user does not have a specific VPN IP address configured.
  3. In the Dynamic IP Address Network section, in the Number of Bits in Netmask text box, type the netmask for VPN clients to use if a user does not have a specific VPN IP address configured.
  4. In the Routing section, in the Specify private subnets text box, type the private subnets that all VPN clients should have access to.

  1. Click Save Settings.
  2. Click Update Running Server.

Configure VPN Client Settings.

  1. Select Configuration > Client Settings.
  2. On the Client Settings screen, configure the client web server or modify access server client settings.
  3. Click Save Settings.
  4. Click Update Running Server.

Configure AuthPoint

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

Add a Radius 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. Click Add.

  1. In the Name text box, type a resource name for OpenVPN Access Server.
  2. In the Host text box, type the OpenVPN Access Server IP address.
  3. In the User IDdrop-down selection list, select User Name.
  4. In the Shared Secret text box, type the shared secret for OpenVPN Access Server.
  5. Click Save.

Add an Access Policy to AuthPoint

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

In the AuthPoint management UI:

  1. Select Groups.
  2. To add a new group, click Add. 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 slider.
  3. Select which authentication options users in this group can choose from when they authenticate.

    For SAML resources, if you select more than one authentication option, users must choose one of the available options when they authenticate. For example, if you select OTP and Push users can choose whether to type their OTP or approve a push to authenticate, but you cannot require that they do both.

  1. Click Add.

  1. (Optional) Add one or more safe locations to your group. For more information about safe locations and detailed instructions to add them, see About Safe Locations.
  2. Click Save.

Before you can assign users to a group, you must add them to AuthPoint. You can either manually add user accounts, or import user accounts from your LDAP database. For more information about how to add user accounts, see Add User Accounts.

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 web UI. The Gateway functions as a RADIUS server. For more information, see About Gateways.

  1. From the navigation menu, select Gateway.
  2. Click the Name of your 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. From the Select a RADIUS resource text box, select your RADIUS client resource.
  5. Click Save.

Test the Integration

To test the integration of AuthPoint and your configuration of OpenVPN Access Server, you can authenticate with your mobile device. For RADIUS resources, you can choose the one-time password (OTP) or push authentication methods.

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

  1. Run the OpenVPN client application.
  2. In the task bar, right-click OpenVPN and select Connect.

  1. Type your OpenVPN Access Server IP address. Click Continue.

  1. In the Username text box, type AuthPoint user name.
  2. In the Password text box, type your AuthPoint password and OTP. The OTP for your token is shown in the AuthPoint mobile app.
  3. Click Connect.

  1. In the OpenVPN Warning dialog, click Yes to allow the VPN connection to use the unverified profile.

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