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Duo Protection for CrashPlan with Duo Access Gateway

Last Updated: June 1st, 2023

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

Duo Access Gateway reaches Last Day of Support on October 26, 2023 for Duo Essentials, Advantage, and Premier customers. As of that date Duo Support may only assist with the migration of existing Duo Access Gateway applications to Duo Single Sign-On. Customers may not create new DAG applications after May 19, 2022. Please see the Guide to Duo Access Gateway end of life for more details.

Use the Duo Single Sign-on for CrashPlan application to protect CrashPlan with Duo Single Sign-On, our cloud-hosted identity provider featuring Duo Central and the Duo Universal Prompt.

seo_description: | Learn how Duo offers a variety of methods for adding two-factor authentication and flexible security policies to CrashPlan SSO logins.

Duo Protection for CrashPlan has been tested on CrashPlan Server 5.1.0 and 5.3.0.

CrashPlan requires Duo Access Gateway version 1.3.0 or greater. Please upgrade your Duo Access Gateway before attempting to use CrashPlan.


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 CrashPlan 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 CrashPlan.

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 CrashPlan. 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 an Authentication Source.

  2. Add the attributes from the table below that correspond to the Duo attributes Mail attribute, Username attribute, Last name attribute, and First 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,sAMAccountName,sn,givenName in the "Attributes" field.

    Duo Attribute Active Directory OpenLDAP
    Mail attribute mail mail
    Username attribute sAMAccountName uid
    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 CrashPlan when configuring SSO. Make note of the Entity ID URL, you will need this later.

    DAG Metadata Information

Create the CrashPlan 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 CrashPlan 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 CrashPlan. See Protecting Applications for more information about protecting applications in Duo and additional application options.

  3. The CrashPlan URL is the URL used to access your CrashPlan server. For example, if your CrashPlan URL is than you would type in in the field.

  4. CrashPlan uses the Mail attribute, Username attribute, First name attribute, and Last name attribute when authenticating. We've mapped those to DAG supported authentication source attributes as follows:

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

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

  5. Click Save Configuration when done.

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

  3. The CrashPlan SAML application is added.

    CrashPlan Application Added

Configure CrashPlan SSO

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

  1. Log on to CrashPlan as an administrative user and navigate to SettingsSecuritySingle Sign-On. Click Add Identity Provider or Federation.

  2. Once on the "Identity Provider" page paste in the Duo Access Gateway Entity ID URL from earlier and click Continue.


  3. The page will reload with more options. In the Display name field type Duo_Access_Gateway.

  4. Under "Attribute Mapping" uncheck Use default mapping.

  5. Click Use nameId for the Username field.

  6. Fill out the remaining fields following the table below:

    CrashPlan Attribute Duo Attribute
    Email mail
    First name User.FirstName
    Last name User.LastName
  7. After you've entered all the required information click Save.

    CrashPlan Single Sign-On Additional Settings

Enable CrashPlan SSO

Enable the Duo Access Gateway as the authentication source for an organization within CrashPlan.

  1. In CrashPlan navigate to Organizations. Select the organization you want SSO enabled for.

  2. Click the Gear icon in the upper right-hand corner of the screen and select Edit from the drop-down.

  3. When the Organization Settings page appears click the Security button.

  4. In the Servers section uncheck Inherit security settings from parent.

  5. Select SSO from the drop-down for 1. Select an authentication method.

  6. A new option called Choose Providers will appear. Check the box next to Duo_Access_Gateway.

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

    CrashPlan Single Sign-On Additional Settings

Learn more about CrashPlan SSO at the CrashPlan Support Site.

Install CrashPlan application with SSO

CrashPlan desktop clients do not support SSO by default. Follow the documentation found here to install the CrashPlan desktop clients with support for SSO.

Log in with SSO

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

You can also access CrashPlan by going to the CrashPlan login page and click Sign in using single sign-on. 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 CrashPlan site after authenticating.

DAG Login and Authentication Prompt

Congratulations! Your CrashPlan users now authenticate using Duo Access Gateway.

Configure Allowed Hostnames

If you plan to permit use of WebAuthn authentication methods (security keys, U2F tokens, or Touch ID) in the traditional Duo Prompt, Duo recommends configuring allowed hostnames for this application and any others that show the inline Duo Prompt before onboarding your end-users.

The Duo Universal Prompt has built-in protection from unauthorized domains so this setting does not apply.

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 CrashPlan. Learn more about configuring CrashPlan SSO with AD FS at the CrashPlan Support site.

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

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.


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