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Duo Protection for Splunk SSO

Duo offers a variety of methods for adding two-factor authentication and flexible security policies to Splunk SSO logins, complete with inline self-service enrollment and authentication prompt.

These are instructions for protecting Splunk with the Duo Access Gateway. For information about our built-in Splunk protection click here.

Duo Protection for Splunk SSO has been tested on Splunk 6.5.2.

Splunk requires Duo Access Gateway version 1.3.1 or greater. Please upgrade your Duo Access Gateway before attempting to use Splunk.

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.

Duo Access Gateway

Duo Access Gateway (DAG), our on-premises SSO product, layers Duo's strong authentication and flexible policy engine on top of Splunk logins using the Security Assertion Markup Language (SAML) 2.0 authentication standard. Duo Access Gateway authenticates your users using existing on-premises or cloud-based directory credentials and prompts for two-factor authentication before permitting access to Splunk.

Duo Access Gateway is part of the Duo Beyond and Duo Access plans, so you can 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. Duo checks the user, device, and network against an application's policy before allowing access to the application.

Deploy Duo Access Gateway

  1. Install Duo Access Gateway on a server in your DMZ. Follow our instructions for deploying the server and configuring DAG settings.

  2. Include the AD attributes distinguishedName,mail,sAMAccountName,userPrincipalName in the “Attributes” field when configuring the Active Directory authentication source in the DAG admin console. If you've already configured the attributes list for another cloud service provider, append the additional attributes to the list. You must use Active Directory as your authentication source; other DAG authentication sources do not support Splunk logins.

  3. After completing the initial DAG configuration steps, click Applications on the left side of the Duo Access Gateway admin console.

  4. Scroll down the Applications page to the Metadata section. This is the information you need to provide to Splunk when configuring SSO. Click the Download XML metadata link to obtain the DAG metadata file (the downloaded file is named "dag.xml").

    DAG Metadata Information

Enable Splunk SSO

Create the Splunk Application in Duo

  1. Log on to the Duo Admin Panel and navigate to Applications.

  2. Click Protect an Application, locate SAML - Splunk in the applications list, and click Protect this Application. See Getting Started for help.

  3. Enter your Splunk URL used to access the Splunk site in the Domain name field.

    Example: https://splunk.yourcompany.com

  4. Splunk uses the Mail attribute when authenticating. We've mapped Mail attribute to DAG supported authentication source attributes as follows:

    Duo Attribute Active Directory
    Mail attribute mail

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

  5. Click Save Configuration to generate a downloadable configuration file.

    Duo Splunk Application Settings

  6. 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 — or come back and change the application's policies and settings after you finish SSO setup. If you do update any settings, click the Save Changes button when done.

  7. Click the Download your configuration file link to obtain the Splunk application settings (as a JSON file).

    Important: This file contains information that uniquely identifies this application to Duo. Secure this file as you would any other sensitive or password information. Don't share it with unauthorized individuals or email it to anyone under any circumstances!

Add the Splunk Application to Duo Access Gateway

  1. Return to the Applications page of the DAG admin console session.

  2. Click the Choose File button in the "Add Application" section of the page and locate the Splunk SAML application JSON file you downloaded from the Duo Admin Panel earlier. Click the Upload button after selecting the JSON configuration file.

  3. The Splunk SAML application is added.

    Splunk Application Added

Create SAML Groups

Important: The Splunk group names must begin with DAG-Splunk-, and you must also create Active Directory groups to match the Splunk groups. For example, if you create a DAG-Splunk-Admins group in Splunk, also create a DAG-Splunk-Admins group in AD. Add any AD users who should be in that Splunk group to the AD group.

  1. Log into your Splunk admin console as an administrative user. Click Settings in the upper right-hand corner of the screen. Click Access controls located under "Users and Authentication".

  2. Click Authentication method on the "Access controls" page.

  3. Click the SAML radio button and then click Configure Splunk to use SAML.

  4. On the "SAML Groups" page click New Group in the upper right-hand corner of the screen. A new window will appear.

  5. Type the name you'd like to use for the Splunk SAML group. The group name must begin with DAG-Splunk-.

    Example: DAG-Splunk-Admins

  6. Next to "Splunk Roles" you can click on the available Splunk roles to give permission to the users of the group. When you've selected all the roles you'd like to have, click Save. The group will be listed on "SAML Groups" page.

    Splunk SAML Group Configuration

  7. Repeat steps 4-6 to create more Splunk SAML groups.

  8. Make sure that you have created AD groups with the same "DAG-Splunk-..." name as the Splunk groups, and that you've added the AD users who should be authenticated to Splunk using the roles specified in the matching Splunk group.

Add Splunk SSO

  1. While on the "SAML Groups" page click SAML Configuration. A new window will appear.

  2. On the "SAML Configuration" screen click Select File next to "Metadata XML File". Select the dag.xml file you downloaded earlier. The page will reload with populated fields.

  3. In the Entity ID field enter the same URL entered when asked for the Splunk domain name in Create the Splunk Application in Duo.

    Example: https://splunk.yourcompany.com

    Splunk SAML Configuration

  4. Scroll down the screen and check the box next to Sign AuthnRequest.

  5. Check the box next to Verify SAML response.

  6. Under "Advanced Settings" select Unspecified from the Name Id Format drop-down.

  7. Click the HTTP Redirect button next to SSO Binding.

  8. Click the HTTP Redirect button next to SLO Binding.

  9. Click Save.

    Additional Splunk SAML Configuration

Learn more about Splunk SSO at the Splunk docs site.

Enable Splunk SSO

  1. Click Settings in the upper right-hand corner of the screen. Click Access controls located under "Users and Authentication".

  2. Click Authentication method on the "Access controls" page.

  3. Click Reload authentication configuration. The page will reload and SAML authentication will now be enabled.

    Additional Splunk SAML Configuration

Important: You should not enable Duo Security under "Multifactor Authentication" while SAML is enabled. If you'd like to use Duo 2FA to protect Splunk without SAML use Splunk's built-in Duo 2FA.

Verify SSO

If your organization enabled the Duo Access Gateway portal, log into the portal page using the link provided by your administrator. Click Splunk from the dashboard to access the application.

You can also access Splunk by going to the Splunk login page. This redirects to the Duo Access Gateway login page. Enter your Authentication Source logon information, approve Duo two-factor authentication, and get redirected back to the Splunk site after authenticating.

DAG Login and Authentication Prompt

Congratulations! Your Splunk console users now authenticate using Duo Access Gateway.

Microsoft AD FS

Microsoft's Active Directory Federation Services (AD FS) is a popular choice for SSO because it easily integrates with the AD identity store many organizations already have deployed. Duo's support for cloud applications and SSO drops in to an existing AD FS installation to provide secondary authentication after a user passes primary authentication (successful Active Directory logon).

If you don't already have AD federation running the first step is to install and configure Microsoft AD FS in your organization. Microsoft's Deployment Guides for AD FS versions 2.0, 2.1, and 3.0 are available on the TechNet site.

Once your AD FS services are up and running, the second step is to configure the SSO partnership between your AD FS service and the external cloud resource, in this case Splunk. Learn more about configuring Splunk SSO with AD FS at the Splunk docs site.

After you have successfully configured and tested AD FS SSO login to Splunk using your AD domain credentials, you can then install the Duo AD FS integration. AD FS protection is included with Duo's paid plans.

With the Duo integration for AD FS installed, users pass primary authentication to the AD FS service as usual. Once primary authentication succeeds, users are forwarded to the Duo service for secondary authentication. After approving logon using one of Duo's authentication methods, the user is fully logged in to Splunk.

Other Identity Partners

Using a third-party SSO provider for cloud application access? Duo partners with leading cloud SSO providers like Okta and OneLogin to secure access with our strong and flexible authentication platform.

You can also use Duo two-factor authentication with CAS and Shibboleth on-premises IdPs.

Troubleshooting

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

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