Duo Protection for Zoom with Duo Access Gateway

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.

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 acts as an identity provider (IdP), authenticating your users using existing on-premises or cloud-based directory credentials and prompting for two-factor authentication before permitting access to Zoom.

Duo Access Gateway is included in the 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.

Deploy or Update 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 the additional attributes not already present to the list, separated by a comma.

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").

   

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 self-hosted (Duo Access Gateway)" 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.

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.

   

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

Before you do this, verify that you updated the "Attributes" list for your Duo Access Gateway authentication source as specified here.

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.

   

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 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 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

5. 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

6. 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.

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

8. 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

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 mail 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 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.

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. Deployment Guides for AD FS versions 2.1, and 3.0/4.0 are available from Microsoft.

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.