Implement and Manage Federation
Key Concepts
To effectively implement and manage federation, it is essential to understand the following key concepts:
- Federation: A method of integrating on-premises AD with Azure AD using third-party identity providers.
- Active Directory Federation Services (AD FS): A service provided by Microsoft that enables federated identity and access management.
- Security Assertion Markup Language (SAML): An open standard for exchanging authentication and authorization data between parties.
- OpenID Connect (OIDC): An authentication layer on top of OAuth 2.0, used for user authentication and authorization.
- Single Sign-On (SSO): A session and user authentication service that permits a user to use one set of login credentials to access multiple applications.
Explanation of Each Concept
Federation
Federation is a method of integrating on-premises Active Directory (AD) with Azure Active Directory (Azure AD) using third-party identity providers. This allows users to authenticate using their on-premises credentials and access cloud resources without needing to re-authenticate.
Active Directory Federation Services (AD FS)
Active Directory Federation Services (AD FS) is a service provided by Microsoft that enables federated identity and access management. AD FS allows organizations to extend their on-premises identity infrastructure to the cloud, providing a seamless authentication experience for users.
Security Assertion Markup Language (SAML)
Security Assertion Markup Language (SAML) is an open standard for exchanging authentication and authorization data between parties. SAML is commonly used in federation scenarios to enable Single Sign-On (SSO) across different domains and applications.
OpenID Connect (OIDC)
OpenID Connect (OIDC) is an authentication layer on top of OAuth 2.0, used for user authentication and authorization. OIDC provides a standardized way for applications to verify the identity of users and obtain basic profile information about them.
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 reduces the need for users to remember multiple sets of credentials and simplifies the authentication process.
Examples and Analogies
Example: Federation
Imagine you are a member of a global alliance of countries. Each country has its own passport system, but they have agreed to recognize each other's passports. This allows you to travel between countries without needing to obtain a visa for each one. Federation works similarly, allowing users to authenticate across different domains using their existing credentials.
Example: Active Directory Federation Services (AD FS)
Consider a large corporation with offices in multiple countries. Each office has its own local authentication system, but the corporation wants to provide a unified authentication experience for all employees. AD FS acts as the central authentication hub, allowing employees to use their local credentials to access corporate resources from anywhere.
Example: Security Assertion Markup Language (SAML)
Think of SAML as a standardized language used by different countries to communicate with each other. Just as countries use a common language to negotiate treaties, SAML provides a common language for exchanging authentication and authorization data between different domains and applications.
Example: OpenID Connect (OIDC)
Imagine you are using a social media platform to log in to a third-party application. OIDC allows the application to verify your identity using the social media platform's authentication system, providing a seamless login experience without needing to create a new account.
Example: Single Sign-On (SSO)
Consider a university where students need to access multiple online services, such as the library, email, and course management system. With SSO, students can log in once using their university credentials and access all these services without needing to enter their credentials again.