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Duo Protection for Zoom

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

Duo Access Gateway

Duo Access Gateway (DAG), our on-premises SSO product, 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 Access Gateway authenticates your users using existing on-premises or cloud-based directory credentials and prompts for two-factor authentication before permitting access to Zoom.

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 Zoom. 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, configuring DAG settings, and adding your primary authentication source.

  2. Add the attributes from the table below that correspond to the Duo attributes Mail attribute, First Name attribute, and Last Name attribute in the "Attributes" field when configuring your Active Directory or OpenLDAP authentication source in the DAG admin console, separated by a comma. For example, if Active Directory is your authentication source, enter mail,givenName,sn in the "Attributes" field.

    Duo Attribute Active Directory OpenLDAP
    Mail attribute mail mail
    First Name attribute givenName gn
    Last Name attribute sn sn

    If your organization uses other directory attributes than the ones listed here then enter those attribute names instead. If you've already configured the attributes list for another cloud service provider, append these additional attributes to the list.

  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 Zoom when configuring SSO. Click the Download Certificate link to obtain the token signing certificate (the downloaded file is named "dag.crt").

    DAG Metadata Information

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.

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

  3. On the "Account Management" 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.

  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, locate SAML - Zoom in the applications list, and click Protect this Application. See Getting Started for help.

  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 attributes to DAG supported authentication source attributes as follows:

    Duo Attribute Active Directory OpenLDAP SAML IdP Google Azure
    Mail attribute mail mail mail email mail
    First Name attribute givenName gn givenName given_name givenName
    Last Name attribute sn sn sn family_name surname

    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 Zoom 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 Zoom 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 Zoom 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 Zoom SAML application JSON file you downloaded from the Duo Admin Panel earlier. Click the Upload button after selecting the JSON configuration file.

  3. The Zoom SAML application is added.

    Zoom Application Added

Enable Zoom SSO

Add the Duo Access Gateway as a new single sign-on provider for Zoom.

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

  2. Once on the "Single Sign-On" page click Enable Single Sign-On. The page will reload with new options.

  3. Copy the SSO URL information from the Duo Access Gateway admin console Metadata display and paste it into the Zoom Sign-in page URL field.

    Example: https://yourserver.example.com/dag/saml2/idp/SSOService.php

  4. Copy the Logout URL information from the Duo Access Gateway admin console Metadata display and paste it into the Zoom Sign-out page URL field.

    Example: https://yourserver.example.com/dag/saml2/idp/SingleLogoutService.php

  5. The "Identity provider certificate" is the DAG Metadata certificate supplied by Duo Access Gateway. Open the dag.crt 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 this field.

  6. Copy the Entity ID information from the Duo Access Gateway admin console Metadata display and paste it into the Zoom Issuer field.

    Example: https://yourserver.example.com/dag/saml2/idp/metadata.php

  7. Select HTTP-Redirect for Binding.

  8. You can select the default user type you'd like when users are created from the options in Default user type.

    Zoom Single Sign-On Settings

  9. Under the Customize SAML Response Mapping check the boxes next to Email address, First name, and Last name. Leave all other boxes unchecked. Fill in the attributes with the following Duo attribute from the table below:

    Zoom Attribute Duo Attribute
    Email address mail
    First name User.FirstName
    Last name User.LastName

    Leave all other fields blank.

  10. After you've entered all the required information click Save.

    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 Access Gateway login page. Enter your primary directory logon information, approve Duo two-factor authentication, and get redirected back to the Zoom site after authenticating.

DAG Login and Authentication Prompt

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 Access Gateway to authenticate.

Congratulations! Your Zoom 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 Zoom. Learn more about configuring Zoom SSO with AD FS at the Zoom Support Center.

After you have successfully configured and tested AD FS SSO login to Zoom 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 Zoom.

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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