Active Directory Federation Services
Active Directory
Federation Services(ADFS) provides single sign-on (SSO) by using
token-based authentication. With SSO, a service will trust the authentication
token of a user who has successfully logged on to a disparate but trusted
network. As, such the service will grant access without requiring the user to
authenticate again.
SSO through AD FS is not mandatory for Office 365, but
enterprise customers usually implement it because of the need to desire to
leverage existing identity management solutions such as AD.
Different types of user
accounts
There are essentially two classes of user accounts:
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Cloud Identity
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Federated Identity
Cloud Identities
are user accounts that are created directly in Office 365 through the admin
center. The passwords associated with cloud identities are also stored in
Office 365. Cloud identities can be managed through the admin center as well as
through Windows PowerShell.
Federated Identities
refer to user accounts that are maintained outside if Office 365 such as in AD.
Federated identities are the most commonly used accounts in an enterprise
because most enterprises already have an identity management solution such as
AD.
Integrating Active
Directory with Office 365
To fully leverage AD in Office 365, follow these general
steps:
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Add your domain name to your Office 365 tenant.
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Set up and configure SSO through AD FS
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Install and configure the Directory Sync tool.
Active Directory Federation
Services
AD FS is a role in Windows Server. The most prominent and
primary reason to use AD FS with Office 365 is that it allows and AD user to
seamlessly access office 365 without having to re-supply her credentials again.
However, if your organization decides to implement AD FS, the minimum AD FS
version required by office 365 is version 2.0; thus, it is often referred to as
AD FS 2.0
Single
sign-on experience
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Scenario 1: No single sign-on experience
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Scenario 2: User is logged on at work
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Scenario 3: Remote worker on a virtual private
network connection
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Scenario 4: Remote worker is not logged on to
the corporate network
Steps
to Implement SSO using AD FS
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Remediate your AD UPN suffix.
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Install IIS on the server that will host AD FS.
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Protect IIS with an Secure Sockets Layer(SSL)
certificate
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Install and configure AD FS 2.0