Duo Single Sign-On for Splunk Enterprise

Overview

As business applications move from on-premises to cloud hosted solutions, users experience password fatigue due to disparate logons for different applications. Single sign-on (SSO) technologies seek to unify identities across systems and reduce the number of different credentials a user has to remember or input to gain access to resources.

While SSO is convenient for users, it presents new security challenges. If a user's primary password is compromised, attackers may be able to gain access to multiple resources. In addition, as sensitive information makes its way to cloud-hosted services it is even more important to secure access by implementing two-factor authentication and zero-trust policies.

About Duo Single Sign-On

Duo Single Sign-On is our cloud-hosted SSO product which layers Duo's strong authentication and flexible policy engine on top of Splunk Enterprise logins. Duo Single Sign-On acts as an identity provider (IdP), authenticating your users using existing on-premises Active Directory (AD) or another SSO IdP. Duo SSO prompts users for two-factor authentication and performs endpoint assessment and verification before permitting access to Splunk Enterprise.

Duo Single Sign-On is available in Duo Premier, Duo Advantage, and Duo Essentials plans, which also include the ability to define policies that enforce unique controls for each individual SSO application. For example, you can require that Salesforce users complete two-factor authentication at every login, but only once every seven days when accessing Splunk Enterprise. Duo checks the user, device, and network against an application's policy before allowing access to the application.

Configure Single Sign-On

Before configuring Splunk Enterprise with Duo SSO using Security Assertion Markup Language (SAML) 2.0 authentication you'll first need to enable Duo Single Sign-On for your Duo account and configure a working authentication source.

Once you have your SSO authentication source working, continue to the next step of creating the Splunk Enterprise application in Duo.

Create the Splunk Enterprise Application in Duo

1. Log on to the Duo Admin Panel and navigate to Applications → Protect an Application.

2. Locate the entry for Splunk Enterprise with a protection type of "2FA with SSO hosted by Duo (Single Sign-On)" in the applications list. Click Protect to the far-right to start configuring Splunk Enterprise. See Protecting Applications for more information about protecting applications with Duo and additional application options. You'll need the information on the Splunk Enterprise page under Downloads later.

3. Splunk Enterprise uses the Mail attribute and Display name attribute when authenticating. We've mapped the bridge attributes to Duo Single Sign-On supported authentication source attributes as follows:

   Bridge Attribute	Active Directory	SAML IdP
   <Email Address>	mail	Email
   <Display Name>	displayName	DisplayName

   If you are using non-standard attributes for your authentication source, check the Custom attributes box and enter the names of the attributes you wish to use instead.

4. You can adjust additional settings for your new SAML application at this time — like changing the application's name from the default value, enabling self-service, or assigning a group policy.

5. Keep the Duo Admin Panel tab open. You will come back to it later.

Duo Universal Prompt

The Duo Universal Prompt provides a simplified and accessible Duo login experience for web-based applications, offering a redesigned visual interface with security and usability enhancements.

Universal Prompt	Traditional Prompt

The Duo Splunk Enterprise application supports the Universal Prompt by default, so there's no additional action required on your part to start using the newest authentication experience.

Activate Universal Prompt

Activation of the Universal Prompt is a per-application change. Activating it for one application does not change the login experience for your other Duo applications. Universal Prompt is already activated for new Splunk Enterprise applications at creation.

The "Universal Prompt" area of the application details page shows that this application's status is "Activation complete", with these activation control options:

• Show traditional prompt: Your users experience Duo's traditional prompt via redirect when logging in to this application.
• Show new Universal Prompt: (Default) Your users experience the Universal Prompt via redirect when logging in to this application.

The application's Universal Prompt status shows "Activation complete" both here and on the Universal Prompt Update Progress report.

For the time being, you may change this setting to Show traditional prompt to use the legacy experience. Keep in mind that support for the traditional Duo prompt ended for the majority of applications in March 2024. This option will be removed in the future.

Universal Update Progress

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. You can also activate the new prompt experience for multiple supported applications from the report page instead of visiting the individual details pages for each application.

Enable Splunk Enterprise for SSO

1. Log into your Splunk Enterprise account as an administrator.

2. At the top of the page, click Settings.

3. Under "USERS AND AUTHENTICATION", click Authentication methods. The "Authentication Methods" page opens.

4. Click the SAML radio button and then click the Configure Splunk to use SAML link. The "SAML Configuration" pop-up window opens.

5. Click Download File.

6. Return to the Duo Admin Panel. Under "Service Provider", click Choose File and open the metadata file you downloaded from Splunk Enterprise earlier.

7. In the Duo Admin Panel under "Downloads", click Download XML.

8. Scroll down to the bottom of the page and click Save.

9. Return to the Splunk Enterprise "SAML Configuration" pop-up window. Click Select File and open the XML file you downloaded from the Duo Admin Panel earlier.

10. In the Splunk Enterprise "SAML Configuration" pop-up window, scroll down to "General Settings" and locate the Entity ID field.

11. Return to the Duo Admin Panel. Under "Service Provider", copy the Entity ID and paste it into the Splunk Enterpise Entity ID field.

    Example: splunkEntityId

12. In the Splunk Enterprise "SAML Configuration" pop-up window, scroll down to "Advanced Settings".

13. Click the Name Id Format drop-down menu and select Email Address.

14. Next to "SSO Binding", click HTTP Redirect.

15. Next to "Signature Algorithm", click SHA256.

16. Next to "SLO Binding", click HTTP Post.

17. Click Save. The "SAML Configuration" pop-up window closes and you return to the "SAML Groups" page.

18. In the upper right corner of the page, click New Group. The "Create New SAML Group" pop-up window opens.

19. Enter a unique name for your group into the Group Name field.

20. In the "Available item(s)" field, select your desired roles.

21. Click Save. The "Create New SAML Group" pop-up window closes and you return to the "SAML Groups" page.

22. In the Name column, copy the group you created and paste it into the Duo Admin Panel Splunk Enterprise Group Name field, under "Service Provider".

23. In the Duo Admin Panel, click the Duo groups drop-down menu and select the applicable Duo groups.

    

24. Scroll to the bottom of the page and click Save.

Learn more about Splunk Enterprise SSO at Splunk Customer Support.

Using SSO

You can log on to Splunk Enterprise by navigating to your Splunk server URL. You will be automatically redirected to Duo Single Sign-On to begin authentication.

Active Directory Login

With Active Directory as the Duo SSO authentication source, enter the primary username (email address) on the Duo SSO login page and click or tap Next.

Enter the AD primary password and click or tap Log in to continue.

Enable Duo Passwordless to log in to Duo SSO backed by Active Directory authentication without entering a password in the future.

SAML Login

With another SAML identity provider as the Duo SSO authentication source, Duo SSO immediately redirects the login attempt to that SAML IdP for primary authentication. Users do not see the Duo SSO primary login screen.

Duo Authentication

Successful verification of your primary credentials by Active Directory or a SAML IdP redirects back to Duo. Complete Duo two-factor authentication when prompted and then you'll return to Splunk Enterprise to complete the login process.

* Universal Prompt experience shown.

Congratulations! Your Splunk Enterprise users now authenticate using Duo Single Sign-On.

See the full user login experience, including expired password reset (available for Active Directory authentication sources) in the Duo End User Guide for SSO.

Enable Remembered Devices

To minimize additional Duo two-factor prompts when switching between Splunk Enterprise and your other Duo Single Sign-On SAML applications, be sure to apply a shared "Remembered Devices" policy to your SAML applications.

Troubleshooting

Need some help? Try searching our Knowledge Base articles or Community discussions. For further assistance, contact Support.