Duo integrates with your SonicWALL SRA SSL VPN to add two-factor authentication to any browser VPN login, complete with inline self-service enrollment and Duo Prompt.
If you are using SonicWALL's Global VPN Client using IPsec or the SonicWALL Mobile Connect app then see the VPN Client Instructions to configure the SonicWALL device to use Duo Security's push authentication. Other types of SonicWALL devices (such as the NSA series or Aventail) may also work with Duo's RADIUS Application.
The Duo web-based prompt is compatible with SonicWALL SRA firmware versions up to 8.5.x. It is not supported on SMA 8.6+ devices.
This integration communicates with Duo's service on TCP port 443. Also, we do not recommend locking down your firewall to individual IP addresses, since these may change over time to maintain our service's high availability.
You should already have a working primary authentication configuration for your SonicWALL SRA SSL VPN users before you begin to deploy Duo.
To integrate Duo with your SonicWALL SRA 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:
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!
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).
Ensure that OpenSSL, Python 2.6 or 2.7 (including development headers and libraries), 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 openssl-devel python-devel libffi-develOn Debian-derived systems, install these dependencies by running (as root):
$ apt-get install build-essential libssl-dev python-dev libffi-devDownload the most recent Authentication Proxy for Unix from https://dl.duosecurity.com/duoauthproxy-latest-src.tgz. Depending on your download method, the actual filename may reflect the version e.g. duoauthproxy-2.10.1-src.tgz. View checksums for Duo downloads here.
Extract the Authentication Proxy files and build it as follows:
$ tar xzf duoauthproxy-latest-src.tgz
$ cd duoauthproxy-version-src
$ makeInstall the authentication proxy (as root):
$ cd duoauthproxy-build
$ ./installFollow the prompts to complete the installation.
If you ever need to uninstall the proxy, run /opt/duoauthproxy/uninstall.
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:
| Platform | Default Configuration Path |
|---|---|
| Windows (64-bit) | C:\Program Files (x86)\Duo Security Authentication Proxy\conf\authproxy.cfg |
| Windows (32-bit) | C:\Program Files\Duo Security Authentication Proxy\conf\authproxy.cfg |
| Linux | /opt/duoauthproxy/conf/authproxy.cfg |
The configuration file is formatted as a simple INI file. Section headings appear as:
[section]Individual properties beneath a section appear as:
name=valueThe 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.
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.
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
host
|
The hostname or IP address of your domain controller. |
service_account_username
|
The username of a domain member account that has permission to bind to your Active Directory and perform searches. We recommend creating a service account that has read-only access. |
service_account_password
|
The password corresponding to service_account_username. If you're on Windows and would like to encrypt this password, see Encrypting Passwords in the full Authentication Proxy documentation.
|
search_dn
|
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: |
Optional
host_2
|
The hostname or IP address of a secondary/fallback domain controller. You can add additional domain controllers as host_3, host_4, etc.
|
security_group_dn
|
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. Other users will not pass primary authentication. For example: |
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=comFor 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:
Required
host
|
The IP address of your RADIUS server. You can add backup servers with host_2, host_3, etc.
|
secret
|
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. |
Optional
port
|
The authentication port on your RADIUS server. By default, the proxy will attempt to contact your RADIUS server on port 1812. Use port_2, port_3, etc. to specify ports for the backup servers.
|
pass_through_all
|
If this option is set to "true", all RADIUS attributes set by the primary authentication server will be copied into RADIUS responses sent by the proxy. Default: "false" |
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.
Next, we'll set up the Authentication Proxy to work with your SonicWALL SRA SSL VPN. Create a [radius_server_iframe] section with the following properties:
Required
type
|
sonicwall_sra | ||||||
ikey
|
Your integration key. | ||||||
skey
|
Your secret key. | ||||||
api_host
|
Your API hostname (e.g. "api-XXXXXXXX.duosecurity.com"). | ||||||
radius_ip_1
|
The IP address of your SonicWALL SRA SSL VPN. | ||||||
radius_secret_1
|
A secret to be shared between the proxy and your SonicWALL SRA SSL VPN. If you're on Windows and would like to encrypt this secret, see Encrypting Passwords in the full Authentication Proxy documentation. | ||||||
client
|
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. |
Optional
port
|
The port on which to listen for incoming RADIUS Access Requests. Default: 1812. | ||||
failmode
|
Either "safe" or "secure":
|
||||
radius_ip_2
|
The IP address of your second SonicWALL SRA SSL VPN, if you have one. You can specify additional devices as as radius_ip_3, radius_ip_4, etc.
|
||||
radius_secret_2
|
The secrets shared with your second SonicWALL SRA SSL VPN, if using one. You can specify secrets for additional devices as radius_secret_3, radius_secret_4, etc. If you're on Windows and would like to encrypt this secret, see Encrypting Passwords in the full Authentication Proxy documentation.
|
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=sonicwall_sra
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=safeMake sure to save your configuration file when done.
View video guides for proxy deployment at the Authentication Proxy Overview or see the Authentication Proxy Reference Guide for additional configuration options.
Open an Administrator command prompt and run:
net start DuoAuthProxyAlternatvely, open the Windows Services console (services.msc), locate "Duo Security Authentication Proxy Service" in the list of services, and click the Start Service button.
If the service starts successfully, Authentication Proxy service output is written to the authproxy.log file, which can be found in the log subdirectory.
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 Windows Services console or issuing these commands from an Administrator command prompt:
net stop DuoAuthProxy & net start DuoAuthProxyOpen a root shell and run:
# /opt/duoauthproxy/bin/authproxyctl startTo ensure the proxy started successfully, run:
# /opt/duoauthproxy/bin/authproxyctl statusAuthentication Proxy service output is written to the authproxy.log file, which can be found in the log subdirectory.
To stop and restart the Authentication Proxy, open a root shell and run:
# /opt/duoauthproxy/bin/authproxyctl restartIf 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.
You can add Duo authentication to an existing remote access portal, or you can create a new portal to use with Duo. Follow these steps to create a new portal.
On the General tab, add the following to the end of the text in the Login Message box:
<script src="https://API_HOSTNAME/frame/hosted/Duo-SonicWALL-SRA-v1.js"></script>Replace API_HOSTNAME with your API hostname (i.e. api-XXXXXXXX.duosecurity.com)
Select the Display custom login page check box.
Make sure to write down or copy the Portal URL so we can access this portal after we are finished with the setup.
Click on the Virtual Host tab.
Enter your desired Virtual Host Domain Name.
Click Accept to save the settings.
Under Primary Radius server, enter the following information:
| Radius server address | The IP address of your Duo Authentication Proxy | Radius server port | 1812 |
| Secret password | The RADIUS secret shared with your Duo Authentication Proxy |
| Radius Timeout (Seconds) | Increase to 60 |
For the Portal name, select the portal(s) that should use this new RADIUS domain from the list.
Click Accept to save the settings.
To test your setup, go to the Duo-Portal URL that you previously copied to log in to your SonicWALL SRA VPN. Make sure to select Duo Domain from the Domain drop down list.
After you complete primary authentication, the Duo enrollment/login prompt appears.
Need some help? Take a look at the SonicWALL SRA Frequently Asked Questions (FAQ) page or try searching our SonicWALL SRA Knowledge Base articles or Community discussions. For further assistance, contact Support.
