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Table 72 Hosting Choices Host When to Use
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Host in IIS for unattended services that start and stop with the system If you re deploying into an environment that already has IIS running, many of the administrative policies are already in place, and IT staff may already be trained IIS hosting is limited to HTTP transports Host in IIS if you want to leverage WCF for services (as opposed to ASMX) but want access to some of the ASMX/ASPNET features
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Host in WAS for unattended services that start and stop with the system but that use TCP, MSMQ, named pipes, or other transports Host in a managed service (aka NT Service) if you want a custom administration interface for starting and stopping the host Managed services can be con gured to start and stop with the system Many commercial grade applications run as managed services
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Summar y
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Host When to Use
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Host a desktop application if you re implementing a service for user interaction Peer networking is a common example Console applications are great for testing services because debugging is very straightforward
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facet of business applications in today s environment that is more critical than security Certainly performance and availability are also central concerns, but there is little value in an application that is sometimes secure (in fact, it is probably more harmful than valuable) When we use an online banking service, we trust that the application providers have done their utmost to prevent abuse, corruption of data, hacking, and exposure of our nancial details to others The same is expected of us as we provide WCF-based services to consumers This chapter will focus on the concepts behind security and the practical means by which services are secured (when necessary) using WCF We ll begin by introducing the major concepts, and then work our way into the details, showing many examples along the way After a description of concepts, to provide background necessary to work with the remainder of the chapter, we begin with an introduction to the creation and use of certi cates to secure services That in hand, we cover the details behind ensuring security from the transport and message perspectives A large part of the chapter focuses on practical approaches for security services in commonly encountered scenarios These are categorized into two broad groups, modeling intranet and Internet environments
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T S HARD TO IMAGINE A
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Finally, we end the chapter by showing how to enable WCF s security auditing features, enabling us to track and diagnose issues related to authentication and authorization of callers to our service operations
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Before we get to the code, con guration, and processes for implementing secure services, let s begin by introducing four major tenets of service security: authentication, authorization, con dentiality, and integrity With those de ned, we ll then describe the concepts of transport and message security as they apply to WCF
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Authentication One of the most fundamental concepts of security is knowing who is knocking on your door Authentication is the process of establishing a clear identity for an entity, for example, by providing evidence such as username and password Although this is clearly important for a service to understand of its callers, it is equally important that callers have an assurance that the service being called is the expected service and not an impostor WCF provides several options for this mutual authentication by both the service and the caller for example, certi cates and Windows accounts and groups By using these and other options, as we ll show throughout this chapter, each side can have rm trust that they are communicating with an expected party Authorization The next step in security, after identity has been established, is to determine whether the calling party should be permitted to do what they are requesting This process is called authorization because the service or resource authorizes a caller to proceed Note that you can choose to authorize anonymous users for actions as well, so although authorization is not strictly dependent on authentication, it does normally follow Authorization can be performed by custom code in the service, native or custom authorization providers, ASPNET roles, Windows groups, Active Directory, Authorization Manager, and other mechanisms
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