Deep dive into Web Single Sign-on with WS-Federation. Learn how to implement secure federated identity, manage STS, and bridge legacy apps with modern CIAM.

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WS-Federation is a claims-based identity protocol primarily used in Microsoft ecosystems for federated authentication across trust boundaries. The protocol uses a passive requestor profile with browser redirects, wrapping SAML tokens in WS-Fed envelopes signed by Identity Providers. Implementation in hybrid environments requires careful configuration of endpoints, certificate management, and User Principal Name matching between on-premise Active Directory and cloud tenants. Security considerations include session management, single sign-off implementation, MFA claim propagation, and certificate expiration monitoring. While SAML suits enterprise SaaS and OIDC fits modern APIs, WS-Federation remains optimal for legacy .NET applications, ADFS deployments, and SharePoint integrations.

Web Single Sign-on with WS-Federation

Understanding the Role of WS-Federation in Modern SSO

Technical Architecture and the Authentication Flow

Implementing WS-Federation in a Hybrid Environment