Duo Security does not provide a native CAS integration. Unicon includes support for Duo in their third-party multifactor module for CAS 4.1.x. See Unicon's CAS-MFA project wiki for additional information.
CAS 5.0.x includes Duo multifactor support. See the CAS Documentation for configuration instructions.
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.
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!
Migration to Universal Prompt for your CAS application is a two-step process:
CAS needs an update to support the Universal Prompt when it's ready, but the update isn't available yet. The "Universal Prompt" section reflects this status as "Waiting on App Provider". Please refer to the CAS community for information about Duo Universal Prompt support for CAS, or contact Duo Support.
After CAS includes the necessary changes you may need to install an application update or upgrade on your server to obtain Duo Universal Prompt support.
You'll later return to the settings on this page to activate the Universal Prompt for your CAS users once we've released it.Click the See Update Progress link to view the Universal Prompt Update Progress report. This report shows the update availability and migration progress for all your Duo applications in-scope for Universal Prompt support.