Duo Single Sign-On for Zoom

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 Zoom 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 Zoom.

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 Zoom. Duo checks the user, device, and network against an application's policy before allowing access to the application.

Configure Single Sign-On

Before configuring Zoom 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 Zoom application in Duo.

Apply for Zoom Vanity URL

Zoom requires that your account have a vanity URL to set up SSO. If you already have a vanity URL such as yourcompany.zoom.us you can skip this section.

1. Log into Zoom as an administrative user. Click on your account picture in the upper-right hand corner of the page.

2. Click on Account Management and then Account Profile located in the left-hand navigation menu.

3. On the "Account Profile" page click Apply next to Vanity URL. A new window will appear.

4. In the new window, type in the vanity subdomain name you'd like to use such as yourcompany and click Apply. This subdomain name is case-sensitive.

5. You will have to wait the vanity URL to be approved by Zoom. You will receive notification via email.

6. Once your vanity URL is approved you can continue.

Create the Zoom Application in Duo

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

2. Locate the entry for Zoom 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 Zoom. See Protecting Applications for more information about protecting applications with Duo and additional application options. You'll need the information on the Zoom page under Metadata later.

3. The Zoom Vanity Subdomain is the subdomain used when logging into your organization's Zoom account. For example, if your Zoom login URL is yourcompany.zoom.us then enter yourcompany as the subdomain name in Duo.

4. Zoom uses the Mail attribute, First name attribute, and Last 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
   <First Name>	givenName	FirstName
   <Last Name>	sn	LastName

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

   

5. 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.

6. Scroll to the bottom of the page and click the Save button. Leave this page open as you'll need this information 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

We've already updated the Duo Zoom application hosted in Duo's service to support the Universal Prompt, so there's no action required on your part to update the application itself. If you created your Zoom application before March 2024, you can activate the Universal Prompt experience for users from the Duo Admin Panel. Zoom applications created after March 2024 have the Universal Prompt activated by default.

If you created your Zoom application before March 2024, it's a good idea to read the Universal Prompt Update Guide for more information, about the update process and the new login experience for users, before you activate the Universal Prompt for your application.

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.

The "Universal Prompt" area of the application details page shows that this application is "Ready to activate", 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" here and on the Universal Prompt Update Progress report.

Should you ever want to roll back to the traditional prompt, you can return to this setting and change it back to Show traditional prompt. However, this will still deliver the Duo prompt via redirect, not in an iframe. Keep in mind that support for the traditional Duo prompt ended for the majority of applications in March 2024.

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 Zoom SSO

Add the Duo Single Sign-On as a new single sign-on provider for Zoom.

1. Log on to Zoom as an administrative user and click on Advanced and then Single Sign-On located in the left-hand navigation menu.

2. If this is your first time enabling SSO you may need to click Enable Single Sign-On on the "Single Sign-On" page

3. Under "Start Using SSO by Setting SAML Basic Info" click Configure SSO Manually. The page will reload with new options.

4. On the "Configure SSO Manually" page, copy the Sign-in page URL from the Duo Admin Panel Metadata section and paste it into the Zoom Sign-in page URL field.

   Example: https://sso-abc1def2.sso.duosecurity.com/saml2/sp/DIABC123678901234567/sso

5. Copy the Sign-out page URL from the Duo Admin Panel Metadata section and paste it into the Zoom Sign-out page URL field.

   Example: https://sso-abc1def2.sso.duosecurity.com/saml2/sp/DIABC123678901234567/slo

6. Return to the Duo Admin Panel with the Zoom application open. Under "Downloads", click Copy certificate. Return to Zoom and paste the certificate file text into the Identity provider certificate field in Zoom, deleting the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- lines from the pasted certificate text.

7. Next to Service Provider (SP) Entity ID select the option that does not contain https://.

8. Copy the Issuer from the Duo Admin Panel Metadata section and paste it into the Zoom Issuer field.

   Example: https://sso-abc1def2.sso.duosecurity.com/saml2/sp/DIABC123678901234567/metadata

9. Select HTTP-Redirect for Binding.

10. Select SHA-256 for Signature Hash Algorithm.

11. Under "Security" there are various options that you can change. Do not check the boxes next to "Sign SAML request", "Sign SAML Logout request", or "Support encrypted assertions".

12. "Provision User" has different options for creating new users in Zoom if they don't already exist.

13. Click Save Changes. The page will update with "Update Single-Sign On success".

14. At the top of the screen click SAML Response Mapping. The page will display new options.

15. You can select the default user type you'd like when users are created from the options in Default user type. Click Edit and select the default type and then click Save Changes.

16. Click Map to SAML Attribute next to "Email address". In the field that appears type User.Email and then click Save Changes.

17. Click Map to SAML Attribute next to "First name". In the field that appears type User.FirstName and then click Save Changes.

18. Click Map to SAML Attribute next to "Last name". In the field that appears type User.LastName and then click Save Changes.

    

Learn more about Zoom SSO at the Zoom Support Center.

Verify SSO

You can log on to Zoom by navigating to your Zoom SSO page e.g. yourcompany.zoom.us and clicking Sign In in the top right-hand corner. This redirects you 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 Zoom to complete the login process.

* Universal Prompt experience shown.

You can also log into Zoom using Duo Central, our cloud-hosted portal which allows users to access all of their applications in one spot. Link to Zoom in Duo Central by adding it as an application tile. Once the tile has been added, log into Duo Central and click the tile for IdP-initiated authentication to Zoom.

If using the Zoom desktop or mobile app, click Sign In and then click SSO. A pop-up will appear; enter in your Vanity URL Subdomain and click Continue to redirect to Duo Single Sign-On to authenticate.

Congratulations! Your Zoom 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 Zoom 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.