3.1.3 Identity Federation Explained
Key Concepts
- Identity Federation
- Single Sign-On (SSO)
- Security Assertion Markup Language (SAML)
- OAuth
- OpenID Connect
Identity Federation
Identity Federation is a framework for interoperability between security domains. It allows users from one domain to access resources in another domain without needing separate authentication credentials for each domain. This simplifies user access management and enhances security.
Example: A university uses Identity Federation to allow its students to access online resources from multiple educational platforms without needing to create separate accounts for each platform.
Single Sign-On (SSO)
Single Sign-On (SSO) is a session and user authentication service that permits a user to use one set of login credentials to access multiple applications. SSO is a common feature of Identity Federation, providing a seamless user experience.
Example: An employee logs into their company's SSO system with a single username and password. This grants them access to the company's intranet, email, and other applications without needing to log in separately to each.
Security Assertion Markup Language (SAML)
Security Assertion Markup Language (SAML) is an XML-based standard for exchanging authentication and authorization data between security domains. SAML enables web-based SSO and is widely used in Identity Federation.
Example: A company uses SAML to integrate its internal applications with a third-party SaaS provider. When an employee logs into the company's SSO system, SAML exchanges authentication data to grant access to the SaaS application without requiring a separate login.
OAuth
OAuth is an open standard for access delegation, commonly used as a way for users to grant websites or applications access to their information on other websites without giving them the passwords. OAuth is often used in conjunction with Identity Federation.
Example: A user logs into a social media app using their Google account. OAuth allows the app to access the user's Google profile information without needing the user's Google password.
OpenID Connect
OpenID Connect is an authentication layer on top of OAuth 2.0, which allows clients to verify the identity of the end-user based on the authentication performed by an authorization server. It provides a simple and secure way to handle user authentication in Identity Federation.
Example: A user logs into an online shopping website using their Facebook account. OpenID Connect verifies the user's identity through Facebook's authorization server, allowing the shopping website to authenticate the user without needing their Facebook password.
Examples and Analogies
Think of Identity Federation as a passport system that allows users to access multiple countries without needing separate visas for each country. Single Sign-On (SSO) is like having a single passport that grants access to all the countries you need to visit.
Security Assertion Markup Language (SAML) is like a secure messaging system that exchanges passport information between countries to verify your identity. OAuth is like a customs system that allows you to bring certain items into a country without needing to declare them at every border.
OpenID Connect is like a modern passport system that not only verifies your identity but also provides additional security features to ensure that your identity is protected during travel.
Conclusion
Identity Federation is a powerful framework that simplifies user access management and enhances security by allowing users to access resources across different domains with a single set of credentials. By understanding and implementing key concepts such as Identity Federation, Single Sign-On (SSO), Security Assertion Markup Language (SAML), OAuth, and OpenID Connect, organizations can create a seamless and secure user experience.