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CHAPTER 7 ■ IMPLEMENTING WCF SECURITY 243ramrameshreddy.blog.comWhat are cards, and how many types of cards does CardSpace support? A card is a digitallysigned entity that illustrates the user’s claims to a system. In general, two types of cards exist. Thefirst one is the personal card. The user can issue these cards to herself. This is similar to pickingan e-mail address and a password for a Passport account. The second type is the provider card.This is provided by a trusted third party. These cannot be issued by the user. This is similar to abank card that is given to you by the bank.How Does Windows CardSpace Work?How does CardSpace work? You may remember that your bank card has a magnetic strip onthe back of it. This stores your claims to the bank system. Windows CardSpace works the same.CardSpace converts your personal or provider cards to special tokens and validates theirauthenticity on demand. Different card types can use different tokens for this validations.Personal cards use SAML 1.1 token types by default. However, provider card tokens are subjectto an organization’s technology preferences.■Note It is important to note that CardSpace is based on the WS-Trust specification. Windows CardSpacecan use SAML tokens to validate the user claims. However, it is not restricted to SAML tokens. It can use anycustom token algorithm as long the server can validate the credentials. It is also important to understandthat the Windows CardSpace is the Microsoft implementation of an identity metasystem. There are otheridentity metasystems based on other software platforms. Currently, CardSpace is available only on theWindows XP SP2, Windows Server 2003 SP1, and Windows Vista operating systems.So, what is the difference between Passport and CardSpace? Microsoft .NET Passport isone identity system that enables access to multiple Microsoft resources. Passport’s singleidentity system fits well into the metaidentity system of CardSpace. Microsoft has also indicatedthat a metaidentity system that supports multiple identities is more scalable thanattempting to dominate the world with a single identity system (such as Passport). CardSpaceis already supported by a Java toolkit from Ping Identity (a major player in the identity space).Therefore, you can utilize multiple identities on heterogeneous platforms to validate identitieswith CardSpace.How do you know whether you have CardSpace available on your system? How can you setup cards that can be used by WCF for authentication purposes? You can verify the CardSpaceavailability by navigating to Start ➤ Control Panel. You should have an icon called Digital Identities.Your screen should be similar to Figure 7-13.When you double-click the icon, you will see a wizard that will assist you in creating personalcards and exporting provider cards. This interface acts as a container for all your identityneeds. Now you’ll learn how to use CardSpace in WCF.ramrameshreddyramrameshreddy
amrameshreddy.blog.com244 CHAPTER 7 ■ IMPLEMENTING WCF SECURITYramrameshreddy.blog.comFigure 7-13. Checking whether you have CardSpace available on your systemEnabling Windows CardSpace in WCFCardSpace is one of the client credential types in WCF. CardSpace is used as an authenticationmechanism on the client side. The server receives a token that summarizes the claims in thepersonal or provider card. However, the service side must authenticate itself using an X.509certificate to verify the authenticity. (In other words, since you rely on a foreign token, youneed to make sure you have valid credentials at the server side to execute the service.) Therefore,the configuration file will be similar to Listing 7-12.Listing 7-12. Service Application Configuration File for CardSpace Support
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amrameshreddy.blog.comTHE EXPERT’
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amrameshreddy.blog.comPro WCF: Prac
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amrameshreddy.blog.comApplying Beha
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amrameshreddy.blog.comxii ■CONTEN
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amrameshreddy.blog.comxiv ■CONTEN
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amrameshreddy.blog.comxviii ■FORE
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amrameshreddy.blog.comxx ■ABOUT T
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amrameshreddy.blog.comxxviii ■INT
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amrameshreddy.blog.com4 CHAPTER 1
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amrameshreddy.blog.com426 APPENDIX
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amrameshreddy.blog.com456 ■INDEXr
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