Duo SAML Configuration

Category: Login with SSO
On this page:

    This article contains Duo-specific help for configuring Login with SSO via SAML 2.0 For help configuring Login with SSO for another IdP, refer to SAML 2.0 Configuration.

    Configuration involves working simultaneously between the Bitwarden Web Vault and the Duo Admin Portal. As you proceed, we recommend having both readily available and completing steps in the order they’re documented.

    Tip

    Already an SSO expert? Skip the instructions in this article and download screenshots of sample configurations to compare against your own.

    Download Sample

    Open SSO in the Web Vault

    Note

    This article assumes that you have already set up Duo with an Identity Provider. If you haven’t, see Duo’s documentation for details.

    If you’re coming straight from SAML 2.0 Configuration, you should already have an Organization ID created. If you don’t refer to that article to create an Organization ID for SSO.

    Navigate to your Organization’s ManageSingle Sign-On screen:

    SAML 2.0 Configuration
    SAML 2.0 Configuration

    You don’t need to edit anything on this screen yet, but keep it open for easy reference.

    Protect an Application

    In the Duo Admin Portal, navigate to the Applications screen and select the Protect an Application button:

    Protect an Application
    Protect an Application

    In the search bar, type generic service provider and select Generic Service Provider (Single Sign-On):

    Generic Service Provider
    Generic Service Provider

    Complete the following steps and configurations on the Application configuration screen, some of which you’ll need to retrieve from the Bitwarden Single Sign-On screen:

    Configuration Screen
    Configuration Screen

    Metadata

    You don’t need to edit anything in the Metadata section, but you’ll need to use these values later:

    URLs for Configuration
    URLs for Configuration

    Downloads

    Select the Download certificate button to download your X.509 Certificate, as you’ll need to use it later in the configuration.

    Service Provider

    Field Description
    Entity ID Set this field to the pre-generated SP Entity ID retrieved from the Bitwarden SSO configuration screen.

    For Cloud-hosted customers, this is always https://sso.bitwarden.com/saml2. For self-hosted instances, this is determined by your configured server URL, for example https://your.domain.com/sso.saml2.
    Assertion Consumer Service (ACS) URL Set this field to the pre-generated Assertion Consumer Service (ACS) URL retrieved from the Bitwarden SSO Configuration screen.

    For Cloud-hosted customers, this is always https://sso.bitwarden.com/saml2/your-org-id/Acs. For self-hosted instances, this is determined by your configured server URL, for example https://your.domain.com/sso/saml2/your-org-id/Acs.
    Service Provider Login URL Set this field to the login URL from which users will access Bitwarden.

    For Cloud-hosted customers, this is always https://vault.bitwarden.com/#/sso. For self-hosted instances, this is determined by your configured server URL, for example https://your.domain.com/#/sso.

    SAML Response

    Field Description
    NameID format Set this field to the SAML NameID format for Duo to send in SAML responses.
    NameID attribute Set this field to the Duo attribute that will populate the NameID in responses.
    Signature algorithm Set this field to the encryption algorithm to use for SAML assertions and responses.
    Signing options Select whether to Sign response, Sign assertion, or both.
    Map attributes Use these fields to map IdP attributes to SAML response attributes. Regardless of which NameID attribute you configured, map the IdP Email Address attribute to Email, as in the following screenshot:
    Required Attribute Mapping
    Required Attribute Mapping

    Once you’ve finished configuring these fields, Save your changes.

    Back to the Web Vault

    At this point, you’ve configured everything you need within the context of the Duo Portal. Jump back over to the Bitwarden Web Vault to complete configuration.

    The Single Sign-On screen separates configuration into two sections:

    • SAML Service Provider Configuration will determine the format of SAML requests.
    • SAML Identity Provider Configuration will determine the format to expect for SAML responses.

    Service Provider Configuration

    Configure the following fields according to the choices selected in the Duo Admin Portal during application setup:

    Field Description
    Name ID Format NameID Format to use in the SAML request (NameIDPolicy). Set this field to the selected NameID format.
    Outbound Signing Algorithm Algorithm used to sign SAML requests, by default rsa-sha256.
    Signing Behavior Whether/when SAML requests will be signed. By default, Duo will not require requests to be signed.
    Minimum Incoming Signing Algorithm The minimum signing algorithm Bitwarden will accept in SAML responses. By default, Duo will sign with rsa-sha256, so choose that option from the dropdown unless you’ve selected a different option.
    Want Assertions Signed Whether Bitwarden wants SAML assertions signed. Check this box if you selected the Sign assertion signing option.
    Validate Certificates Check this box when using trusted and valid certificates from your IdP through a trusted CA. Self-signed certificates may fail unless proper trust chains are configured within the Bitwarden Login with SSO docker image.

    When you’re done with the Service Provider Configuration section, Save your work.

    Identity Provider Configuration

    Identity Provider Configuration will often require you to refer back to the Duo Admin Portal to retrieve application values:

    Field Description
    Entity ID Enter the Entity ID value of your Duo application, which can be retrieved from the Duo app Metadata section.
    Binding Type Set this field to HTTP Post.
    Single Sign On Service URL Enter the Single Sign-On URL value of your Duo application, which can be retrieved from the Duo app Metadata section.
    Single Log Out Service URL Login with SSO currently does not support SLO. This option is planned for future development, however you may pre-configure with the Single Log-Out URL value of your Duo application.
    Artifact Resolution Service URL For Duo implementations, you can leave this field blank.
    X509 Public Certificate Paste the downloaded Certificate, removing -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----.

    Extra spaces, carriage returns, and other extraneous characters will cause certifiation validation to fail.
    Outbound Signing Algorithm Set this field to the selected SAML Response signature algorithm.
    Allow Unsolicited Authentication Response Login with SSO currently does not support unsolicited (IdP-Initiated) SAML assertions. This option is planned for future development.
    Disable Outbound Logout Requests Login with SSO currently does not support SLO. This option is planned for future development.
    Want Authentication Requests Signed Whether Duo expects SAML requests to be signed.

    When you’re done with the Identity Provider Configuration section, Save your work.

    Test the Configuration

    Once your configuration is complete, test it by navigating to https://vault.bitwarden.com and selecting the Enterprise Single Sign-On button:

    Enterprise Single Sign-On button
    Enterprise Single Sign-On button

    Enter the configured Organiztion Identifier and select Log In. If your implementation is successfully configured, you’ll be redirected to your source IdP’s login screen.

    After you authenticate with your IdP login and Duo Two-factor, enter your Bitwarden Master Password to decrypt your Vault!