ADFS SAML Implementation
This article contains Active Directory Federation Services (AD FS)-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 within the Bitwarden Web Vault and the AD FS Server Manager. As you proceed, we recommend having both readily available and completing steps in the order they’re documented.
Already an SSO expert? Skip the instructions in this article and download screenshots of sample configurations to compare against your own.
Open SSO in the Web Vault
Navigate to your Organization’s Manage → Single Sign-On screen:
You don’t need to edit anything on this screen yet, but keep it open for easy reference.
Create a Relying Party Trust
In the AD FS Server Manager, select Tools → AD FS Management → Action → Add Relying Party Trust. In the Wizard, make the following selections:
- On the Welcome screen, select Claims Aware.
- On the Select Data Source screen, select Enter data about the relying party manually.
- On the Specify Display Name screen, enter a Bitwarden-specific display name.
On the Configure URL screen, select Enable support for SAML 2.0 WebSSO protocol.
In the Relying party SAML 2.0 SSO service URL input, enter the 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
- On the Choose Access Control Policy screen, select the
On the Configure Identifiers screen, add the SP Entity ID (retrieved from the Bitwarden SSO Configuration screen) as a relying party trust identifier.
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
- On the Choose Access Control Policy screen, select the desired policy (by default, Permit Everyone).
- On the Ready to Add Trust screen, review your selections.
Once the Relying Party Trust is created, you can further configure its settings by selecting Relying Party Trusts from the left-hand file navigator and selecting the correct display name.
To change the Secure hash algorithm (by default, SHA-256), navigate to the Advanced tab:
To change the endpoint Binding (by default, POST), navigate to the Endpoints tab and select the configured ACS URL:
Edit Claim Issuance Rules
Construct Claim Issuance Rules to ensure that the appropriate claims, including Name ID, are passed to Bitwarden. The following tabs illustrate a sample ruleset:
In the left-hand file navigator, select AD FS → Service → Certificates to open the list of certificates. Select the Token-signing certificate, navigate to its Details tab, and select the Copy to File… button to export the Base-64 encoded token signing certificate:
You will need this certificate during a later step.
Get Federation Service Identifier
In the left-hand file navigator, select AD FS and from the right-hand options menu select Edit Federation Service Properties. In the Federation Service Properties window, copy the Federation Service Identifier:
You will need this identifier during a later step.
Back to the Web Vault
At this point, you’ve configured everything you need within the context of the AD FS Server Manager. 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
In the Service Provider Configuration section, configure the following fields:
|Name ID Format||Select the Outgoing Name ID Format selected when constructing Claims Issuance Rules (see Rule 3).|
|Outbound Signing Algorithm||The algorithm Bitwarden will use to sign SAML requests.|
|Signing Behavior||Whether/when SAML requests will be signed.|
|Minimum Incoming Signing Algorithm||By default, AD FS will sign with SHA-256. Select SHA-256 from the dropdown unless you’ve configured AD FS to use different algorithm.|
|Want Assertions Signed||Whether Bitwarden expects SAML assertions to be signed.|
|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 AD FS Server Manager to retrieve values:
|Entity ID||Enter the retrieved Federation Service Identifier. Please note, this may not use HTTPS.|
|Binding Type||By default, AD FS with use HTTP POST endpoint binding. Select HTTP POST unless you’ve configured AD FS to use a different method.|
|Single Sign On Service URL||Enter the SSO Service Endpoint. This value can be retrieved from the Service → Endpoints tab in AD FS Manager and by default should begin with
|Artifact Resolution Service URL||Only use this field if you have selected Artifact as the endpoint binding method of your Relying Party Trust.|
|X509 Public Certificate||Paste the downloaded certificate, removing
Extra spaces, carriage returns, and other extraneous characters will cause certification to fail.
|Outbound Signing Algorithm||By default, AD FS will sign with SHA-256. Select SHA-256 from the dropdown unless you’ve configured AD FS to use different 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 AD FS 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-On button:
Enter the configured Organization Identifier and select Log In. If your implementation is successfully configured, you’ll be redirected to the AD FS SSO login screen. After you authenticate with your AD FS credentials, enter your Bitwarden Master Password to decrypt your Vault!