Category: Kerberos

AAD-DS + KCD-PT + Federation (or how to avoid passwords on the cloud)

New (and only available within Azure) are the Azure Active Directory Domain Services. This service is based on Azure Active Directory and the data replicated into it. It provides Domain Services as a service to subscription administrators and can be very useful for many scenario’s where domain services are required, but security or management of domain controllers in the cloud is a concern.

In many documents, you will see that you need to replicate user password [hashes] into AAD to make it fully work.. but this post is about how you can avoid that using Kerberos Constraint Delegation with Protocol Transition….
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2FA via the cloud – Cryptocard

So many of you probably have been wondering what type of 2FA I am using for my tests. Instead of setting up internal servers, dealing with encryption keys and various tokens, I stumbled upon a cloud service that handles all of this for you. Now before we dive into the “commercial” part (although I did not see any money from them) the basics for configuring TMG with radius are also covered in this post, so if you prefer another vendor, your own radius/2FA solution, this post still applies.

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IIS & Kerberos Kernel Mode

A new post about kerberos.. indeed some techno stuff nobody seems to understand but is very important for security. A new feature in Windows 2008 IIS7 is the kernel mode support, what does it do, and more important how can it help you?

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Windows 2008R2 features part VI: Managed Service Accounts – delegation

In a previous entry I’ve explained how you can run services under the new Managed  Service Account. Say now that we want to use this service account in combination with Kerberos and the account needs to be trusted for delegation. We set an SPN to it, but in the Active Directory Users and Computers, we seem to be unable to find the trusted for delegation option.. Let’s take a closer look at these accounts once they have been created, to do this we’ll be using ldp.exe

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Kerberos multiple hops

You all remember the maximum 2 hops for Kerberos right.. well in Microsoft land it works a little different and it is possible to create a multiple tier Kerberos delegation structure.

 

Basically we want the following to happen:

 

Client->IIS1->IIS2->IIS3->IIS4 where all hops require Kerberos authentication

 

In this case, IIS1, IIS2 and IIS3 need to be trusted for delegation. In my test lab I’ve used (http://support.microsoft.com/kb/314404) for the setup..

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Kerberos PAC validation

 

 
basically, all Kerberos tickets in windows have a PAC (that holds all the groups of the identity). If the resource that is accessed is NOT running under system account (but user/service), the resource will issue a verification of the PAC at the nearest domain controller. That DC will verify the PAC load and will give the green light.
 
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