Jorge's Quest For Knowledge!

All About Identity And Security On-Premises And In The Cloud – It's Just Like An Addiction, The More You Have, The More You Want To Have!

(2016-12-24) Can You Use ADFS v2.x To Federate With Azure AD?

Posted by Jorge on 2016-12-24


You might still be running ADFS v2.0 and you want to know if you can federate with Azure AD and what possible limitations are.

Below you can find my experiences:

  1. Federated user authentication against Azure AD will work
  2. Federated computer authentication against Azure AD will NOT work. In other words Auto Azure AD join will not work
  3. Redirecting MFA from Azure AD to on-premises ADFS will NOT work, unless you have a custom developed MFA solution for ADFS v2.x

[AD.1]

The read about the configurations required, see (2016-12-16) Automatic Azure AD Join With ADFS v3.0 And Higher And Conditional Access – What You Really Need In Detail. Look at the claims rules for user authentication on the RP trust for Azure AD and the CP trust for AD.

[AD.2]

All the required configurations as mention in (2016-12-16) Automatic Azure AD Join With ADFS v3.0 And Higher And Conditional Access – What You Really Need In Detail can be achieved in ADFS, except one! You just configure the "AllowedAuthenticationClassReferences" on the RP trust for Azure AD, which is not possible in ADFS v2.0

[AD.3]

To use MFA with ADFS v2.0, like it is possible in ADFS v3.0 and higher, you have bought or developed a custom MFA solution. Any investment in that is pointless as you cannot reuse it in any way in ADFS v3.0 or higher due to the different architecture. Therefore, without an MFA solution in ADFS v2.0 you will not be able to redirect any MFA required to the on-premises ADFS. It must be processed by Azure AD itself.

Cheers,
Jorge
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* Always evaluate/test yourself before using/implementing this!
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