pdf417 c# open source Figure 6-3. A B2B Web service in Visual C#.NET

Creation PDF-417 2d barcode in Visual C#.NET Figure 6-3. A B2B Web service

Figure 6-3. A B2B Web service
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Multiple Internet Web services: These services are exposed by organizations whose policies require single sign-on capabilities (SSO). In this scenario the web application needs to access several services provided by an organization that stores user credentials in a database. The web application uses a secure channel to communicate with a Security Token Service (STS) that generates a secure token. This secure token can be used to interact with Web services A and B. This model provides a performance benefit because the authentication of the user is done only once: at the beginning of the session. The rest of the service calls are done using the secure token provided by the STS. Figure 6-4 illustrates a highly utilized web application that needs to access more than one external service. These common security scenarios helped Microsoft define a set of core strategies that allow software developers to easily secure a Web service. These strategies are called turnkey security assertions and they are available in WSE 3.0 as a group of predefined policies that can be configured using the WSE 3.0 Settings Tool, or manually via code or a configuration file. Before we discuss these turnkey assertions, let s review the policy framework provided by WSE. This will help you understand the way that messages get processed when they are being sent or received by a client or a service.
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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Figure 6-4. A multiple Internet Web service
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WSE 3.0 Security Policies
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WSE provides a set of classes that allow you to define your security requirements by declaring a policy using an XML configuration file. This file can be edited manually or using the WSE Settings Tool. Later in this chapter you will have the opportunity to use this tool to implement security policies for a client and service project. Each policy file can contain multiple policies, which gives you the flexibility to enforce different security restrictions within the same application. You can also define your policies directly in the code. This could be a good option if you don t want to have the flexibility to add the policy definition without having to recompile your application. We recommend using policy files, since they will give system administrators the ability to modify the policy depending on the characteristics of the deployment environment. If you separate the security policy from the code you will increase the maintainability of your system and it will make your application easier to secure. A policy is a group of policy assertions that map directly to a class. These classes get instantiated at runtime by the WSE framework and they are responsible for processing the SOAP messages and applying digital signatures, encryption, or any other custom processing that you might need, such as writing the content of the message to trace log.
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Note WSE 3.0 has greatly simplified the policy model, compared to the one provided by WSE 2.0. In this
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new version of WSE, the declarative model and the imperative programming model have been aligned so that you can use policy files to implement the same security restrictions that you could define via code.
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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Listing 6-3 shows a simplified policy file that defines that SOAP messages should be secured using Kerberos. The name of the class that implements the assertion is shown in bold. Listing 6-3. Policy File Showing an Empty Kerberos Assertion <policies xmlns="http://schemas.microsoft.com/wse/2005/06/policy"> <extensions> <extension name="kerberosSecurity" type="Microsoft.Web.Services3.Design.KerberosAssertion, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </extensions> <policy name="MyKerberosPolicy"> <kerberosSecurity /> </policy> </policies> You can assign a policy to a Web service by using the Policy attribute, as shown in the following example: [Policy("MyKerberosPolicy")] public class Service : System.Web.Services.WebService { public Service () {} [WebMethod] public string HelloWorld() { return "Hello World"; } } You can do the same at the client side by applying the Policy attribute to the proxy class autogenerated by WSE 3.0. When you use WSE 3.0, your proxy file will contain a couple of classes that you can use to communicate with the service. One of them inherits from SoapHttpClientProtocol and it doesn t provide the extended capabilities offered by WSE. The second one inherits from WebServicesClientProtocol and this is the class that allows you to benefit from the features of the WSE framework. You could apply the Policy attribute to the second class, but this file is autogenerated and you would lose your changes if you update the Web reference. For this reason, the best way to apply a policy at the client side is using the SetPolicy method of the WSE-enabled proxy class. MyService.ServiceWse myService = new MyService.ServiceWse(); myService.SetPolicy("MyKerberosPolicy"); You can think of policies and their assertions as a pipeline where the assertions are executed in the order in which they are listed. Each policy assertion generates SOAP filters that are responsible for inspecting and modifying the SOAP messages. The methods that apply these filters are defined as abstract methods in the PolicyAssertion class and they are overridden by each policy assertion implementation.
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