This application communicates with Duo's service on TCP port 443. Firewall configurations that restrict outbound access to Duo's service with rules using destination IP addresses or IP address ranges aren't recommended, since these may change over time to maintain our service's high availability. If your organization requires IP-based rules, please review this Duo KB article.
Before moving on to the deployment steps, it's a good idea to familiarize yourself with Duo administration concepts and features like options for applications, available methods for enrolling Duo users, and Duo policy settings and how to apply them. See all Duo Administrator documentation.
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 Duo proxy service on a machine within your network. This Duo proxy server will receive incoming RADIUS requests from your Array AG SSL VPN, contact your existing local LDAP/AD or RADIUS server to perform primary authentication, and then contact Duo's cloud service for secondary authentication.
If you are already running a Duo Authentication Proxy server in your environment, you can use that existing host for additional applications, appending the new configuration sections to the current config. You don't have to set up a new Authentication Proxy server for each application you create. However, there are some cases where it might make sense for you to deploy a new proxy server for a new application, like if you want to co-locate the Duo proxy with the application it will protect in the same data center.
If you will set up a new Duo server, locate (or set up) a system to host the Duo Authentication Proxy installation. The proxy supports these operating systems:
See detailed Authentication Proxy operating system performance recommendations in the Duo Authentication Proxy Reference.
Then you'll need to:
The security of your Duo application is tied to the security of your secret key (skey). Secure it as you would any sensitive credential. Don't share it with unauthorized individuals or email it to anyone under any circumstances!
You also need to download the custom Duo theme for the AG from the Array site. An Array support portal login is required.
If you will reuse an existing Duo Authentication Proxy server for this new application, you can skip the install steps and go to Configure the 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). See additional Authentication Proxy performance recommendations in the Duo Authentication Proxy Reference.
When installing, you can choose whether or not you want to install the Proxy Manager. The Proxy Manager is a Windows utility that helps you edit the Duo Authentication Proxy configuration, determine the proxy's status, and start or stop the proxy service. Learn more about using the Proxy Manager. Installing the Proxy Manager adds about 100 MB to the installed size.
If you do not want to install the Proxy Manager, you may deselect it on the "Choose Components" installer screen before clicking Install.
To perform a silent install on Windows, issue the following from an elevated command prompt after downloading the installer (replacing version with the actual version you downloaded):
/exclude-auth-proxy-manager to install silently without the Proxy Manager:
duoauthproxy-version.exe /S /exclude-auth-proxy-manager
Ensure that Perl and a compiler toolchain are installed. On most recent RPM-based distributions — like Fedora, RedHat Enterprise, and CentOS — you can install these by running (as root):
$ yum install gcc make libffi-devel perl zlib-devel diffutils
On Debian-derived systems, install these dependencies by running (as root):
$ apt-get install build-essential libffi-dev perl zlib1g-dev
If SELinux is present on your system and you want the Authentication Proxy installer to build and install its SELinux module, include
selinux-policy-devel in the dependencies:
$ yum install gcc make libffi-devel perl zlib-devel diffutils selinux-policy-devel
$ apt-get install build-essential libffi-dev perl zlib1g-dev selinux-policy-devel
Download the most recent Authentication Proxy for Unix from https://dl.duosecurity.com/duoauthproxy-latest-src.tgz. From the command line you can use
wget to download the file, like
$ wget --content-disposition https://dl.duosecurity.com/duoauthproxy-latest-src.tgz. Depending on your download method, the actual filename may reflect the version e.g. duoauthproxy-5.7.1-src.tgz. View checksums for Duo downloads here.
Extract the Authentication Proxy files and build it as follows:
$ tar xzf duoauthproxy-5.7.1-src.tgz $ cd duoauthproxy-version-src $ make
Install the authentication proxy (as root):
$ cd duoauthproxy-build $ ./install
Follow the prompts to complete the installation. The installer creates a user to run the proxy service and a group to own the log directory and files. You can accept the default user and group names or enter your own.
If SELinux is present on the target server, the Duo installer will ask you if you want to install the Authentication Proxy SELinux module. Your selection affects whether systemd can start the Authentication Proxy after installation.
|SELinux Mode||Default Response||Result|
|Enforcing||Yes||Choose 'yes' to install the Authentication Proxy's SELinux module. This permits start of the Authentication Proxy service by systemd. If you choose 'no' then the SELinux module is not installed, and systemd cannot start the Authentication Proxy service.|
|Permissive||No||Choose 'no' to decline install of the Authentication Proxy's SELinux module. The Authentication Proxy service can be started by systemd. However, if you change SELinux from permissive to enforcing mode after installing the Duo proxy, systemd can no longer start the Authentication Proxy service. If you plan to enable SELinux enforcing mode later, you should choose 'yes' to install the Authentication Proxy SELinux module now.|
To install the Duo proxy silently with the default options, use the following command:
sudo ./duoauthproxy-build/install --install-dir /opt/duoauthproxy --service-user duo_authproxy_svc --log-group duo_authproxy_grp --create-init-script yes
--enable-selinux=yes|no to the install command to choose whether to install the Authentication Proxy SELinux module.
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:
|Windows||v5.0.0 and later||
|Windows||v4.0.2 and earlier||
Note that as of v4.0.0, the default file access on Windows for the
conf directory is restricted to the built-in Administrators group during installation.
The configuration file is formatted as a simple INI file. Section headings appear as:
Individual properties beneath a section appear as:
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.
The Duo Authentication Proxy Manager is a Windows utility for managing the Authentication Proxy installation on the Windows server where you install the Authentication Proxy. The Proxy Manager comes with Duo Authentication Proxy for Windows version 5.6.0 and later.
The Proxy Manager cannot manage remote Duo Authentication Proxy servers, nor can you install the Proxy Manager as a stand-alone application. There is no Proxy Manager available for Linux. The Proxy Manager only functions as part of a local Duo Authentication Proxy installation on Windows servers.
Learn more about using the Proxy Manager in the Duo Authentication Proxy Reference before you continue.
To launch the Proxy Manager utility:
%ProgramFiles%\Duo Security Authentication Proxy\conf\authproxy.cfgfile for editing.
Use the Proxy Manager editor on the left to make the
authproxy.cfg changes in these instructions. As you type into the editor, the Proxy Manager will automatically suggest configuration options. Accepting these suggestions helps make sure you use the correct option syntax.
As you follow the instructions on this page to edit the Authentication Proxy configuration, you can click Validate to verify your changes (output shown on the right).
When you complete the Authentication Proxy configuration steps in this document, you can use the Save button to write your updates to
authproxy.cfg, and then use the
authproxy.cfg button to start the Authentication Proxy service before continuing on to the next configuration steps.
If you do not use the Proxy Manager to edit your configuration then we recommend using WordPad or another text editor instead of Notepad when editing the config file on Windows.
In this step, you'll set up the Proxy's primary authenticator — the system which will validate users' existing passwords. Determine which type of primary authentication you'll be using, and create either an Active Directory/LDAP
[ad_client] client section, or a RADIUS
[radius_client] section as follows.
To use Active Directory/LDAP as your primary authenticator, add an
[ad_client] section to the top of your config file. Add the following properties to the section:
The hostname or IP address of your domain controller.
The username of a domain account that has permission to bind to your directory and perform searches. We recommend creating a service account that has read-only access.
The password corresponding to
The LDAP distinguished name (DN) of an Active Directory container or organizational unit (OU) containing all of the users you wish to permit to log in. For example:
The hostname or IP address of a secondary/fallback domain controller. You can add additional domain controllers as
To further restrict access, specify the LDAP distinguished name (DN) of a security group that contains the users who should be able to log in as direct group members. Nested groups are not supported. Users who are not direct members of the specified group will not pass primary authentication. Example:
Starting with Authentication Proxy v3.2.0, the
LDAP attribute found on a user entry which will contain the submitted username. In most Active Directory configurations, it should not be necessary to change this option from the default value. OpenLDAP directories may use "uid" or another attribute for the username, which should be specified with this option.
[ad_client] host=22.214.171.124 host_2=126.96.36.199 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.
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:
The IP address of your RADIUS server. You can add backup servers with
A secret to be shared between the Authentication Proxy and your existing RADIUS server. If you're on Windows and would like to encrypt this secret, see Encrypting Passwords in the full Authentication Proxy documentation.
The authentication port on your RADIUS server. Use
If this option is set to
[radius_client] host=188.8.131.52 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.
Next, we'll set up the Authentication Proxy to work with your Array AG SSL VPN. Create a
[radius_server_iframe] section and add the properties listed below. If you've already set up the Duo Authentication Proxy for a different RADIUS iframe application, append a number to the section header to make it unique, like
Your integration key.
Your secret key.
Your API hostname (e.g. "api-XXXXXXXX.duosecurity.com").
The IP address of your Array AG SSL VPN.
A secret to be shared between the proxy and your Array AG SSL VPN. If you're on Windows and would like to encrypt this secret, see Encrypting Passwords in the full Authentication Proxy documentation.
The mechanism that the Authentication Proxy should use to perform primary authentication. This should correspond with a "client" section elsewhere in the config file.
This parameter is optional if you only have one "client" section. If you have multiple, each "server" section should specify which "client" to use.
The port on which to listen for incoming RADIUS Access Requests. If you have multiple RADIUS server sections you should use a unique port for each one.
Either "safe" or "secure":
The IP address of your second Array AG SSL VPN, if you have one. You can specify additional devices as as
The secrets shared with your second Array AG SSL VPN, if using one. You can specify secrets for additional devices as
A completed config file, using Active Directory as the primary authenticator, should look something like:
[ad_client] host=184.108.40.206 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=220.127.116.11 radius_secret_1=radiussecret1 client=ad_client port=1812 failmode=safe
Make sure to save your configuration file in your text editor — or validate and save in the Proxy Manager for Windows — when you're finished making changes.
If you installed the Duo Authentication Proxy Manager utility (available with 5.6.0 and later), click the Start Service button at the top of the Proxy Manager window to start the service.
To start the service from the command line, open an Administrator command prompt and run:
net start DuoAuthProxy
Alternatively, open the Windows Services console (
services.msc), locate "Duo Security Authentication Proxy Service" in the list of services, and click the Start Service button.
Authentication Proxy v5.1.0 and later includes the
authproxyctl executable, which shows the connectivity tool output when starting the service. The installer adds the Authentication Proxy
C:\Program Files\Duo Security Authentication Proxy\bin to your system path automatically, so you should not need to specify the full path to
authproxyctl to run it.
From an administrator command prompt run:
If the service starts successfully, Authentication Proxy service output is written to the authproxy.log file, which can be found in the
If you see an error saying that the "service could not be started", open the Application Event Viewer and look for an Error from the source "DuoAuthProxy". The traceback may include a "ConfigError" that can help you find the source of the issue.
Stop and restart the Authentication Proxy service by either clicking the Restart Service button in the Duo Authentication Proxy Manager or the Windows Services console or issuing these commands from an Administrator command prompt:
net stop DuoAuthProxy & net start DuoAuthProxy
To stop and restart the Authentication Proxy using authproxyctl, from an administrator command prompt run:
Open a root shell and run:
# /opt/duoauthproxy/bin/authproxyctl start
To ensure the proxy started successfully, run:
# /opt/duoauthproxy/bin/authproxyctl status
Authentication Proxy service output is written to the authproxy.log file, which can be found in the
To stop and restart the Authentication Proxy, open a root shell and run:
# /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.
Log in to the Array AG administrative interface. Change the mode from "Enable" to "Config".
Navigate to the Virtual Site that you'd like to protect using the drop-down list in the upper left corner.
Click on AAA under the "Site Configuration" menu on the left.
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.
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.
On the "Advanced RADIUS Server Configuration" page, click the Add RADIUS Server link in the lower right.
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|
|Redundancy Order||1 if this is the first RADIUS server|
|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.
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.
Click on Web Access under the "Access Method" on the left, and then click the URL Property tab.
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.
Click the Save Configuration link in the top right corner of the Array AG administrative interface, when prompted for confirmation click OK.
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.
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 theme and click Import.
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.
Click the Edit link for the index.html file. Locate both occurrences 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.
Your new custom theme is in 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.
Click the Save Configuration link in the top right corner of the Array AG administrative interface, when prompted for confirmation click OK.
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.
If you plan to permit use of WebAuthn authentication methods (security keys, U2F tokens, or Touch ID) in the traditional Duo Prompt, Duo recommends configuring allowed hostnames for this application and any others that show the inline Duo Prompt before onboarding your end-users.
The Duo Universal Prompt has built-in protection from unauthorized domains so this setting does not apply.
Need some help? Review troubleshooting tips for the Authentication Proxy and try the connectivity tool included with Duo Authentication Proxy 2.9.0 and later to discover and troubleshoot general connectivity issues.