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3. Send token.
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4. Issue token.
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5. Send token.
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I think of an issuer as an identity transformer. It converts incoming identities into something that s intelligible to the application.
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ADFS uses a rules engine to support claims transformation.
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Identity Transformation The issuer s job is to take some generic incoming identity (perhaps from a Kerberos ticket or an X.509 certi cate) and transform it into a security token that your application can use. That security token is like the boarding pass, in that it contains all of the user s identity details that your application needs to do its job, and nothing more. Perhaps instead of the user s Windows groups, your boarding pass contains roles that you can use right away. On the other end of the protocol are users who can use their single sign-on credentials to access many applications because the issuer in their realm knows how to authenticate them. Their local issuer provides claims to applications in their local realm as well as to issuers in other realms so that they can use many applications, both local and remote, without having to remember special credentials for each one. Consider the application s local issuer in the last illustration, Federating identity across realms. It receives a security token from a user in some other realm. Its rst job is to reject the request if the incoming token wasn t issued by one of the select issuers that it trusts. But once that check is out of the way, its job now becomes one of claims transformation. It must transform the claims made by the remote issuer into claims that make sense for your application. For a practical example, see chapter 4, Federated Identity for Web Applications. In ADFS, this sort of transformation is done with rules such as, If you see a claim of this type, with this value, issue this claim instead. For example, your application may have a role called Managers that grants special access to manager-speci c features. That claim may map directly onto a Managers group in your realm, so that local users who are in the Managers group always get the Managers role in your application. In the partner s realm, they may have a group called Supervisors that needs to access the manager-speci c features in your application. The transformation from Supervisors to Managers can happen in their issuer; if it does not, it must happen in yours. This transformation simply requires another rule in ADFS. The point is that issuers such as ADFS are speci cally designed to support this type of transformation, because it s rare that two companies will use exactly the same vocabulary.
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1. Alice (in a remote realm) clicks a link to your application. 2. You redirect Alice to your local issuer, just like before. 3. Your issuer redirects Alice s browser to the issuer in her realm. 4. Alice s local issuer authenticates and issues a token, sending Alice s browser back to your issuer with that token. 5. Your issuer validates the token, transforms the claims, and issues a token for your application to use. 6. Your issuer sends Alice s browser back to your application, with the token that contains the claims your application needs. The mystery here is in step 3. How does the issuer know that Alice is from a remote realm What prevents the issuer from thinking she s a local user and trying to authenticate her directly, which will only fail and frustrate the user Even if the issuer knew that Alice was from a remote realm, how would it know which realm it was This is because it s likely that you ll have more than one partner. This problem is known as home realm discovery. Your issuer has to determine if Alice is from the local realm or if she s from some partner organization. If she s local, the issuer can authenticate her directly. If she s remote, the issuer needs to know a URL to redirect her to so that she can be authenticated by her home realm s issuer. There are two ways to solve this problem. The simplest one is to have the user help out. In step 2, when Alice s browser is redirected to your local ADFS, it pauses the protocol and displays a Web page to Alice, asking her what company she works for. (Note that it doesn t help Alice to lie about this, because her credentials are only good for one of the companies on the list her company.) Alice clicks the link for her company and the protocol continues, since the issuer now knows what to do. To avoid asking Alice this question in the future, your issuer sets a cookie in her browser so that next time it ll know who her issuer is without having to ask. The second way to solve this problem is by adding a hint to the query string that s in the link that Alice clicks in step 1. That query string will contain a parameter named whr (hr stands for home realm). The issuer (ADFS 2.0) looks for this hint and automatically maps it to the URL of the user s home realm. This means that the issuer doesn t have to ask Alice who her issuer is because the application relays that information to the issuer. The issuer uses a cookie, just as before, to ensure that Alice is never bothered with this question.
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Take a look at chapter 3, Claims-Based Single Sign-On for the Web, to see an example of this technique.
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