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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Figure 6-22. WS-* Interoperability We ve listed some of the specifications implemented by WSE 3 in Table 6-3. Table 6-3. Specifications Implemented by the Microsoft Web Service Enhancements
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Specification
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WS-Security WS-SecureConnection WS-Trust WS-Policy WS-Addressing WS-Referral WS-Attachment/DIME (Direct Internet Message Encapsulation)
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Meaning in Life
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Allows you to encrypt and sign SOAP messages as well as bind security tokens to the message. Extends WS-Security with the capability for a caller and service to establish a secure connection using keys. Extends WS-Security with the capability to verify trust between the caller and service. Provides a way for the caller and service to agree upon how SOAP messages must be crafted to be accepted. Provides a way to forward and intercept SOAP messages. Provides a way to forward to a new XML Web service while preserving the current message. A new message encoding format that allows SOAP messages to include additional attachments (for example, binary files).
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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A discussion of all of these is beyond the scope of this chapter. Here, we present a highlevel overview, summarizing where WSE fits into the Big Picture. We ll also take a look at an implementation of WS-Security in action. Once WSE 3.0 is installed, from within Visual Studio .NET 2005, you can configure a project to leverage the functionality by right-clicking on the project and choosing WSE Settings 3.0 (see Figure 6-23).
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Figure 6-23. Configuring WSE support from within Visual Studio .NET 2005 Selecting this option brings up a dialog with many tabs. Support for WSE is enabled when you select the check boxes (see Figure 6-24).
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Figure 6-24. Enabling WSE within a project When this dialog is dispatched, Visual Studio adds a reference to the WSE 3.0 assembly, Microsoft.Web.Services3. Modifications will also be made to your Web.Config file to enable support for the SOAP Extensions where the WS-* specifications are implemented: <configSections> <section name="microsoft.web.services3" type="Microsoft.Web.Services3.Configuration.WebServicesConfiguration, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </configSections> <system.web> <webServices> <soapExtensionImporterTypes> <add type="WseSettings.WseExtensionImporter, WseSettings3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=97707682dce9a66b" /> </soapExtensionImporterTypes> <soapServerProtocolFactory type="Microsoft.Web.Services3.WseProtocolFactory, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </webServices>
CHAPTER 6 SOA IN .NET: WEB SERVICES
<compilation> <assemblies> <add assembly="Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> </assemblies> </compilation> </system.web> <microsoft.web.services3> <tokenIssuer> <statefulSecurityContextToken enabled="true" /> </tokenIssuer> </microsoft.web.services3> Each specification that s supported by WSE 3.0 has corresponding types exposed in the Microsoft.Web.Services3 namespace that allow you to control the implementation programmatically. Table 6-4 provides a summary of some of the types found in the assembly. Table 6-4. Summary of Namespaces in the Microsoft.Web.Services3 Assembly
Namespace
Microsoft.Web.Service3
Meaning in Life
This root namespace defines core types to interact with the incoming and outgoing WSE-enabled request/response and SOAP payload. Types that implement the WS-Addressing specification. Types that implement the DIME specification. Types that implement the WS-Referral specification. Types that define the core WS-Security types. There are several subnamespaces here that cover specific security models.
Microsoft.Web.Service3.Addressing Microsoft.Web.Service3.Dime Microsoft.Web.Service3.Messaging Microsoft.Web.Service3.Security
Table 6-4 is just a summary of the namespaces in the assembly. There are others that relate to other parts of the WSE 3.0 implementation. WSE 3.0 actually contains an implementation of a complete SOAP Stack. This stack can be used in concert with the ASMX SOAP Stack exposed by the ASP .NET Framework, or it can be used on its own. The WSE SOAP Stack has an option to listen to a TCP/IP port for incoming SOAP messages. When you use this option, IIS isn t even required. With WSE 3.0, it s also much easier to host the ASMX stack in your own process, removing the need to rely on IIS. When used in concert with the ASMX SOAP Stack running under IIS, WSE intercepts all incoming and outgoing SOAP messages. This is where the SOAP extensions added in the configuration file step in and create or examine the SOAP headers that are needed for the specification s required functionality (see Figure 6-25). There s also a client component to the WSE functionality. When WSE support is enabled in a project, all Web Service proxies that are generated when you add a Web Reference will be modified and extended to account for the WSE functionality.
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