The Federated Identity Service as a Hub for Authentication, Authorization, and Provisioning
- Michel Prompt
- April 1, 2013
- Founder's Corner
- 3 MIN READ
I’ve been blogging in response to Ian Glazer’s video about killing IAM in order to save it (I’m in favor of saving, even if we don’t agree on the killing part).
A Millions Paths to Everywhere: The Internal Authentication Challenge
As we discussed in my most recent post, authenticating users and securely communicating authorization information with a cloud application—or any web-based portal—requires a common endpoint acting as the enterprise IdP. We also know you’ll need to be able to access multiple cloud applications, such as Salesforce, Workday, and Google Apps, as your enterprise moves toward this model. And we’ve seen that you’ll need many token translations on a per-application basis. But this is only one part of the requirement.
Another key function to support is being able to authenticate an incoming user against multiple internal authentication sources. Think about all the legacy applications and identity stores deployed across your infrastructure, with their various authentication methods and protocols—they’re all over the map, right? First, you encounter the AD domains, and get lost in all those forests. The authentication method here could be name/UPN and password or based on Kerberos and Windows integrated authentication. But the user could also be stored in some SQL database with a proprietary hard-coded password encryption. Chasing the user across diverse forests and data stores and knowing which authentication method is appropriate for presenting and checking credentials is a full-time job—one that predates the challenge of cloud applications. In fact, the search for a common identity structure has been a primary headache for IAM for as nearly long as the category has existed. Multiple attempts have been made to solve these issues, from in-house script-and-sync to metadirectories to virtual directories. These new requirements for supporting the cloud have just made it more acute.
No matter what you call it (or how it works)—whether it’s an enterprise directory, metadirectory, or virtual directory—the logical mechanism you need is a federated form of identity. Why federated? Because you don’t want to reinvent this layer, which already exists in a highly distributed, heterogeneous way across your identity silos. Better to tap into what already exists, while giving your underlying data more scope and flexibility by bringing it—or a flexible representation of it—into an identity hub. Now, you could implement this hub in many different ways, but we believe that a virtualization layer, based on a global data model that rationalizes and reconciles the different local views, is the most effective way to do it. And in a world where you will connect to multiple applications using “federation” standards, you need to do more than just federate access via the SaML or OpenID Connect layer—you need to federate your identity layer, as well. And the way to get to a federated identity is through virtualization.
All Roads Lead to the Hub: The Need for a Common Attribute Server and Better Provisioning
Fast forward and think about the n different applications in the cloud you need to provision to, and it’s like déjà vu all over again…with even more complications. So again, as both a final authoritative source of your identity and as an attribute server, you will need a rationalized view of your identity, a federated Identity system.
This diagram illustrates how such a federated identity service would enable authorization and provisioning to cloud-based applications, using attributes from across your heterogeneous stores:
Next time we will look at the architecture of this federated identity, or “FID,” and then we’ll end this series with a deep dive into my favorite topic—context—along with graph and protocols support.
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