c# pdf417 (1) The Client issues a signed request to the STS for a Security Context Token in Visual C#.NET

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(1) The Client issues a signed request to the STS for a Security Context Token
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(2) The STS responds by issuing a Security Context Token SERVICE TOKEN PROVIDER (STS) (3) The Client issues a secured Web service request using the Security Context Token
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(4) The Web service issues a secured response using the Security Context Token
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Note: The Web Service and the Service Token Provider may be accessed through the same virtual directory; or may be deployed on separate servers.
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Note: The Client Security Context the STS prior to first request to
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retrieves a Token from initiating the the Web service.
Figure 8-1. Architecture diagram for a secure conversation solution A secure conversation is initiated by a client that requires an on-demand secure communication session with a Web service. The session may be required for the duration of one request, or for several back-and-forth requests and responses between the client and Web service. The workflow for establishing and conducting a secure conversation is presented in Figure 8-1, and typically follows four steps: Step 1: The client issues a signed request to the security token service provider for a security context token. The client initiates the secure conversation by issuing a signed request to the security token service (STS) provider for a security context token. The client may sign the request with any standard security token, including UsernameToken and X.509 certificates. The sample solution will demonstrate using a UsernameToken security token.
Establish Trusted Communication with WS-Secure Conversation
Step 2: The security token service provider verifies the request and issues a security context token back to the client. The STS provider verifies the integrity of the signed request. It then generates a security context token and delivers it to the client. In the sample solution the Web service itself also acts as the security token service. You can, however, deploy the STS as a separate service. The security context token is actually returned from the STS as a so-called request security token (RST). The client can then extract the security context token from the RST. WSE 2.0 provides all of the support classes that you need to handle these tasks in code. Steps 3 and 4: The client and the Web service use the security context token for further communication. The client and Web service use the security context token to secure back-and-forth request and response communications with each other. The security context token can be used like any standard security token. It inherits from the same base classes and its usage is no different from the security tokens you learned how to work with in 6. Security context tokens may be cached in a global cache for future retrieval, for example, when the client will be issuing multiple requests over a period of time. We will look at how to do this later in the chapter. Programming-wise, Web Services Enhancements (WSE) 2.0 makes it very easy to implement a service token provider because the WSE infrastructure will automatically issue security context tokens. This feature is enabled by simply adding a configuration element to the service token provider s configuration file. The STS provider can be incorporated into the client s target Web service, or the STS provider can be implemented as a dedicated Web service. There is little difference in the code between a hosted service token provider (that resides in the client s target Web service) and a dedicated service token provider (that resides on a separate domain). There are some significant configuration and deployment differences between the two models, but code-wise they are very similar.
NOTE
The feature you know as Secure Conversation uses several WS-Specifications, including WS-Trust, WS-Secure Conversation, and WS-Security. In addition, you can reduce code listings (and potential errors!) by implementing policy frameworks for the participating services and clients. This chapter does not focus on when particular WS-Specifications come into play. Instead, the focus is on understanding the concepts, and discussing practical code samples.
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