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Duo Single Sign-On for Zoom

Last Updated: October 23rd, 2020

Add two-factor authentication and flexible security policies to Zoom SSO logins with Duo Single-Sign On, our cloud-hosted SAML 2.0 identity provider, complete with inline self-service enrollment and Duo Prompt.

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.

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 using the Security Assertion Markup Language (SAML) 2.0 authentication standard. Duo Single Sign-On acts as an identity provider (IdP), authenticating your users using existing on-premises Active Directory (AD) or any SAML 2.0 IdP and prompting for two-factor authentication before permitting access to Zoom.

Duo Single Sign-On is available in Duo Beyond, Duo Access, and Duo MFA 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 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.

  2. Click Protect an Application and 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 in 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.

    Duo Zoom Application Settings

  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.

Duo Universal Prompt

Duo's next-generation authentication experience, the Universal Prompt, is coming to web-based applications that display the current Duo Prompt in browsers.

Migration to Universal Prompt for your Zoom application is a two-step process:

  • Update the Zoom application to support the Universal Prompt.
  • Enable the Universal Prompt experience for users of that Zoom application (when the Universal Prompt becomes available)

We've already updated the Duo Zoom application to support the Universal Prompt when it's ready, so there's no action required on your part to update. The "Universal Prompt" section of this application's details page in the Admin Panel reflects this status today as "New Prompt Ready".

Universal Prompt Info - Application Updated

When the Universal Prompt becomes available, you'll return here to activate it for users of this application.

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.

Read the Universal Prompt Update Guide for more information about the update process to support the new prompt, and watch the Duo Blog for future updates about the Duo Universal Prompt.

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. Click Download certificate next to "Identity provider certificate" on the Duo Admin Panel under Downloads to download the Duo Single Sign-On signing certificate. Open the certificate file in a text editor (like Notepad), and copy the entire contents of the file between the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- lines. Paste the certificate file text into the "Identity provider certificate" field in Zoom.

  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

    Zoom Single Sign-On Settings

  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".

    Zoom Single Sign-On Settings

  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.

    Zoom Single Sign-On Additional Settings

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 click Sign In in the top right-hand corner. This redirects to the Duo Single Sign-On login page. Enter your primary directory logon information, approve Duo two-factor authentication, and get redirected back to the Zoom site after authenticating.

Duo Single Sign-On Login and Authentication Prompt

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 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. You will be directed to the Duo Single Sign-On to authenticate.

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

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.