First Steps

You should already have a working primary authentication configuration for your Array AG SSL VPN users before you begin to deploy Duo.

To integrate Duo with your Array AG SSL VPN, you will need to install a local proxy service on a machine within your network. This Duo proxy server also acts as a RADIUS server — there's usually no need to deploy a separate RADIUS server to use Duo.

Before proceeding, you should locate (or set up) a system on which you will install the Duo Authentication Proxy. The proxy supports Windows and Linux systems (in particular, we recommend Windows Server 2012 R2 or later, Red Hat Enterprise Linux 7 or later, CentOS 7 or later, or Debian 7 or later).

Then you'll need to:

1. Sign up for a Duo account.
2. Log in to the Duo Admin Panel and navigate to Applications.
3. Click Protect an Application and locate Array SSL VPN in the applications list. Click Protect this Application to get your integration key, secret key, and API hostname. See Getting Started for help.

You also need to download the custom Duo theme for the AG from the Array site. An Array support portal login is required.

Install the Duo Authentication Proxy

The Duo Authentication Proxy can be installed on a physical or virtual host. We recommend a system with at least 1 CPU, 200 MB disk space, and 4 GB RAM (although 1 GB RAM is usually sufficient).

Configure the Proxy

After the installation completes, you will need to configure the proxy.

The Duo Authentication Proxy configuration file is named authproxy.cfg, and is located in the conf subdirectory of the proxy installation. With default installation paths, the proxy configuration file will be located at:

The configuration file is formatted as a simple INI file. Section headings appear as:

[section]

Individual properties beneath a section appear as:

name=value

The Authentication Proxy may include an existing authproxy.cfg with some example content. For the purposes of these instructions, however, you should delete the existing content and start with a blank text file. We recommend using WordPad or another text editor instead of Notepad when editing the config file on Windows.

Configure the Proxy for Your Primary Authenticator

In this step, you'll set up the Proxy's primary authenticator — the system which will validate users' existing passwords. In most cases, this means configuring the Proxy to communicate with Active Directory or RADIUS.

Active Directory

To use Active Directory as your primary authenticator, add an [ad_client] section to the top of your config file. Add the following properties to the section:

Required

search_dn=DC=example,DC=com

Optional

security_group_dn=CN=DuoVPNUsers,OU=Groups,DC=example,DC=com

For example:

[ad_client]
host=1.2.3.4
host_2=1.2.3.5
service_account_username=duoservice
service_account_password=password1
search_dn=DC=example,DC=com
security_group_dn=CN=DuoVPNUsers,OU=Groups,DC=example,DC=com

For advanced Active Directory configuration, see the full Authentication Proxy documentation.

RADIUS

To use RADIUS as your primary authenticator, add a [radius_client] section to the top of your config file. Then add the following properties to the section:

Required

Optional

For example:

[radius_client]
host=1.2.3.4
secret=radiusclientsecret

In addition, make sure that the RADIUS server is configured to accept authentication requests from the Authentication Proxy.

For advanced RADIUS configuration, see the full Authentication Proxy documentation.

Configure the Proxy for Your Array AG SSL VPN

Next, we'll set up the Authentication Proxy to work with your Array AG SSL VPN. Create a [radius_server_iframe] section with the following properties:

Required

Optional

A completed config file, using Active Directory as the primary authenticator, should look something like:

[ad_client]
host=1.2.3.4
service_account_username=duoservice
service_account_password=password1
search_dn=cn=Users,dc=example,dc=com
 
[radius_server_iframe]
type=array
ikey=DIXXXXXXXXXXXXXXXXXX
skey=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
api_host=api-XXXXXXXX.duosecurity.com
radius_ip_1=5.6.7.8
radius_secret_1=radiussecret1
client=ad_client
port=1812
failmode=safe

Make sure to save your configuration file when done.

Start the Proxy

net start DuoAuthProxy

net stop DuoAuthProxy & net start DuoAuthProxy

# /opt/duoauthproxy/bin/authproxyctl start

# /opt/duoauthproxy/bin/authproxyctl status

# /opt/duoauthproxy/bin/authproxyctl restart

If you modify your authproxy.cfg configuration after initial setup, you'll need to stop and restart the Duo Authentication Proxy service or process for your change to take effect.

Configure Your Array AG SSL VPN

Add the Duo RADIUS Server

1. Log in to the Array AG administrative interface. Change the mode from "Enable" to "Config".

2. Navigate to the Virtual Site that you'd like to protect using the drop-down list in the upper left corner.

3. Click on AAA under the "Site Configuration" menu on the left.

4. On the General tab, ensure that the Enable AAA option is checked, then click the Server tab. Once on the Server tab, click on RADIUS.

5. Enter a Server Name and Description for the new RADIUS server and click the Add button. Your new RADIUS server is added to the list. Double-click it to open the "Advanced RADIUS Server Configuration" page.

   

6. On the "Advanced RADIUS Server Configuration" page, click the Add RADIUS Server link in the lower right.

7. In the Add RADIUS Server form, enter the following information:

   Server IP	The IP address of your Duo RADIUS proxy
   Server Port	1812 (or whichever port specified in the Duo RADIUS proxy configuration)
   Secret Password	The RADIUS secret configured on your Duo RADIUS proxy
   Timeout	60
   Redundancy Order	1 if this is the first RADIUS server
   Retries	5
   Accounting Port	Default is 1813 (Accounting is not used so any port is fine)

   

   Click Save to save the RADIUS server settings. The new Duo RADIUS server is shown in the RADIUS SERVER CONFIGURATION list back on the "Advanced RADIUS Server Configuration" page.

8. Click on the Method tab then click Add Method on the right. Enter a Method Name and Method Description, then in the "General Authentication Configuration" section choose your Duo RADIUS AAA server from the Authentication drop-down list.

   

   Click Save to save the method configuration. The new method is shown in the list. While still on the Method tab, set the AAA Method for Mobile VPN Clients at the bottom to use the Duo RADIUS authentication method you just created.

   

9. Click on Web Access under the "Access Method" on the left, and then click the URL Property tab.

10. Click the Add URL Property link on the right. Leave the "Mask type" set as Rewrite and enter http://localhost/challenge/ as the "URL". Click the Save link on the right when done.

    

11. Click the Save Configuration link in the top right corner of the Array AG administrative interface, when prompted for confirmation click OK.

Upload the Custom Theme

1. While still logged in to the Array AG Config session, click on Portal under the "Site Configuration" menu on the left, then click the Themes tab.

2. Click Import Theme. Click the Choose File button and select the zipped theme file you downloaded earlier from Array's support portal. Enter a name for the theme and click Import.

   

3. Double-click your newly created theme to get to the "THEME OBJECTS" page, and while on that page double-click the challenge theme object. This takes you to the "OBJECT RESOURCES" page.

4. Click the Edit link for the index.html file. Locate both occurances of the string api-xxxxxxxx.duosecurity.com and replace it with the API host name shown on your Array application's properties page in the Duo Admin Panel.

   

   Click Save in the upper right corner when done. You are returned to the "THEME OBJECTS" page. Click the Back to top link to return to the "Themes" page.

5. Your new custom theme is in the theme list, but is not the default theme. To make it the default theme, click your custom theme once to select it, then click Activate Theme in the upper right.

   

   Click OK in the activation confirmation pop-up. Your custom theme moves to the top of the list after activation.

   

6. Click the Save Configuration link in the top right corner of the Array AG administrative interface, when prompted for confirmation click OK.

Test Your Setup

To test your Array AG two-factor authentication setup, go to the URL that you defined for your sign-in policy. After you complete primary authentication, the Duo enrollment/login prompt appears.

Troubleshooting

Need some help? Take a look at the Array AG Frequently Asked Questions (FAQ) page or try searching our Array AG Knowledge Base articles or Community discussions. For further assistance, contact Support.

Network Diagram

1. Primary authentication initiated to Array AG SSL VPN
2. Array AG SSL VPN send authentication request to Duo Security’s authentication proxy
3. Primary authentication using Active Directory or RADIUS
4. Duo authentication proxy connection established to Duo Security over TCP port 443
5. Secondary authentication via Duo Security’s service
6. Duo authentication proxy receives authentication response
7. Array AG SSL VPN access granted