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Earlier in the chapter, I discussed the authorization options available. While in a production application, you should probably use WSE or WCF, I ll show you how to pass credentials in the SOAP header using the web service support built into Visual Studio 2005.
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CHAPTER 11 s WEB SERVICES INTERFACE
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To use custom authentication, include the following line in the <appSettings> element: <add key="CslaAuthentication" value="Csla"/>
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You could also use the Windows integrated security model, as described earlier. However, if you decide to go down that route, you must not implement the security code shown here.
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When using custom authentication, the Login() method of PTPrincipal will be called to validate the username and password values provided by the consumer that s calling the web service. As discussed earlier, this could be done by putting username and password parameters on every web method, but that would pollute the parameter lists of the methods. Instead, a SOAP header can be used to transfer the values. This is a standard SOAP concept, and it s easily implemented in .NET code (on both the server and consumer).
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Note that the username and password will be passed in clear text in the SOAP envelope. To encrypt this data for additional security, you may want to use the .NET Framework s cryptography support, expose the web service over SSL, or use WSE.
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The following three steps are required in order to set up and use the SOAP header for security credentials: 1. Implement a SoapHeader class that defines the data required from the consumer. 2. Apply a [SoapHeader()] attribute to all web methods that require authentication, indicating that the web method requires the custom SOAP header. 3. Implement a method that takes the username and password values and uses them to authenticate the user, and set up the principal object on the current Thread. Let s walk through the implementation of these steps.
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CslaCredentials Class
SoapHeader is just a class that defines some fields of data that are to be included in the XML header data of a SOAP message. In this case, two values are needed: username and password. These values are passed in the SOAP header along with any method call requiring authentication. The SoapHeader class clearly defines this requirement: public class CslaCredentials : SoapHeader { public string Username; public string Password; } The class itself is very simple it just defines the two required data fields, as shown here: public string Username; public string Password; More important is the fact that it inherits from System.Web.Services.Protocols.SoapHeader. This means that the CslaCredentials object s values will be automatically populated by the .NET runtime, based on the data in the SOAP header that s provided as part of the method call. To make this happen, a [SoapHeader()] attribute will be applied to each web method in the web service to indicate that the SOAP header data should be loaded into a CslaCredentials object.
CHAPTER 11 s WEB SERVICES INTERFACE
Credentials Field
Within the PTService class, the code declares a CslaCredentials field, as follows: public CslaCredentials Credentials = new CslaCredentials(); This step is required because the actual data values will be placed into this object. There s no magic here each web method that needs access to the user s credentials will have a [SoapHeader()] attribute that tells ASP .NET to load the SOAP header data into this specific object. The use of this field, combined with the fact that the CslaCredentials class is public in scope, means that the CslaCredentials type is included as part of the web service s WSDL definition. The result is that any consumers referencing the web service will have full access to the type information, so they will clearly see the required username and password values.
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