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You may need to enable the dynamic challenge-response mechanism in your OpenVPN client. If you specified the reneg-sec option in the server configuration above, be sure to also include it in your client configuration file: reneg-sec 0

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The auth-user-pass line in the client config will cause the OpenVPN client to prompt the user for an additional password (described in more detail below) to authenticate. Configure the ClientĮnsure that the following line is present in the OpenVPN client configuration file of all of your users: auth-user-pass

Save the configuration file and restart the OpenVPN server for the changes to take effect. If your OpenVPN version is below 2.2, then you should instead set reneg-sec to a very large value. Old versions of OpenVPN may fail to connect with reneg-sec set to 0. Therefore, we recommend disabling reneg-sec by setting it to 0 in your server configuration file: reneg-sec 0 If your user's VPN client saves the password and automatically reauthenticates with it, this may cause issues with the user receiving unexpected push notifications or their client replaying a one-time passcode. This setting defaults to 3600 seconds, which means your users must reauthenticate every hour.

This option will determine how often OpenVPN forces a renegotiation, thereby requiring the user to reauthenticate with Duo. We also recommend setting the reneg-sec option in the server configuration file. OpenVPN 2.3 or earlier: plugin /opt/duo/duo_openvpn.so IKEY SKEY HOSTīe sure to replace IKEY, SKEY, and HOST on the plugin line with the integration key, secret key, and API hostname from your OpenVPN application's properties page in the Duo Admin Panel. OpenVPN 2.4 and later: plugin /opt/duo/duo_openvpn.so 'IKEY SKEY HOST' etc/openvpn/nf or /etc/openvpn/nf) and append the following line to it: Open your OpenVPN server configuration file (e.g. The duo_openvpn.so plugin and duo_openvpn.py Python helper script will be installed into /opt/duo.

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Then simply extract, build, and install the plugin.

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To get started with the Duo OpenVPN plugin, download the Duo OpenVPN v2.4 plugin.

Ensure Python 3 or 2.7 is installed on your OpenVPN server.

Download the Duo OpenVPN v2.4 plugin from our duo_openvpn GitHub repository.

See Protecting Applications for more information about protecting applications in Duo and additional application options. You'll need this information to complete your setup. Click Protect to the far-right to configure the application and get your integration key, secret key, and API hostname.

Log in to the Duo Admin Panel and navigate to Applications.Ĭlick Protect an Application and locate the entry for OpenVPN in the applications list.

To get started with Duo for OpenVPN, you'll need to:

Administrators should enroll users ahead of time, either manually through the Duo Admin Panel or with Duo's bulk enrollment (which sends personalized enrollment links via email). Inline self-enrollment is not supported since OpenVPN doesn't offer a web interface for login.'push', 'phone', 'sms') as their OpenVPN password. Users will provide a passcode or factor identifier (eg.Support for OpenVPN deployments with password authentication may be supported in the future. Duo only integrates with OpenVPN servers that employ certificate authentication and use a unique common name (CN) in each user's cert.

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First Stepsīefore 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 Duo Knowledge Base article 7546 for additional guidance. If your organization requires IP-based rules, please review Duo Knowledge Base article 1337.Įffective June 30, 2023, Duo will no longer accept TLS 1.0 or 1.1 connections or support insecure TLS/SSL cipher suites. This application communicates with Duo's service on SSL TCP port 443.įirewall 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.