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User-Level Security
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<defaultCertificate storeLocation="CurrentUser" storeName="TrustedPeople x509FindType="FindBySubjectName" findValue="localhost"/> </serviceCertificate> </clientCredentials> </behavior>
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Alternatively, an encoded version of the public portion of the service s certificate can be supplied in the definition of the endpoint. For example, the following segment from a configuration file is generated by the svcutil utility:
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<client> <endpoint address="http://localhost:8000/UpdateService" binding="wsHttpBinding" contract="UpdateService" name="WSHttpBinding_UpdateService"> <identity> <certificate encodedValue="AwAAAAEAAAAUAAAA...oVbTtOA=="/> </identity> </endpoint> </client>
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Although the options that WCF offers for authentication are helpful, there are always gaps through which specific requirements will fall. It is not possible to guarantee that all the available choices will cover every possible scenario, so in the typical WCF manner, you can extend the authentication process with your own custom mechanism. This section describes the process for doing this, along with some of the ramifications. First, to use custom authentication, the client credential type must be set to UserName. This enables the username and password to be submitted to the service to perform the authentication. A side effect is that with a UserName client credential type, WCF requires the service to reference a certificate that contains a public/private key pair. The public key portion of the certificate then encrypts the credentials before they are transmitted to the service. The default, when the client credential type is UserName, is for the service to use Windows to perform the authentication. To intercept this process, the starting point is to create a class that derives from the UserNamePasswordValidator class, which is in the System.IdentityModel.Selectors namespace. Within this class, the authentication mechanism is introduced into the process by overriding the Validate method, which is involved when WCF is in the middle of authentication. Probably the most interesting aspect of the Validate method is that it doesn t return a Boolean value. In fact, this method call doesn t return any value at all. If the method completes, WCF assumes that the credentials were valid. To invalidate the credentials, a SecurityTokenValidationException exception must be raised. An example of such a class can be seen in the following code:
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Lesson 1: Authentication
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' VB Public Class CustomAuthenticator Inherits UserNamePasswordValidator Public Overrides Sub Validate(userName As String, password As String) If (userName <> "anyuser" OR password <> "good") Then Throw New SecurityTokenValidationException("Invalid credentials") End If End Sub End Class // C# public class CustomAuthenticator : UserNamePasswordValidator { public override void Validate(string userName, string password) { if (userName != "anyuser" || password != "good") throw new SecurityTokenValidationException("Invalid credentials"); } }
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After the Validator class has been created, the next step is to configure the service to use its functionality. You do this by specifying the validator type as part of the service s behavior configuration. The following segment from a configuration file defines a service behavior that does just this:
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<serviceBehaviors> <behavior name="CustomValidator"> <serviceCredentials> <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType= "ThisAssembly.CustomAuthenticator, ThisAssembly"/> <serviceCertificate findValue="localhost" x509FindType="FindBySubjectName" storeLocation="CurrentUser" storeName="My" /> </serviceCredentials> </behavior> </serviceBehaviors>
The userNameAuthentication element contains the details that specify the custom authentication module. Although the serviceCertificate element doesn t have anything to do directly with the custom authentication, it is one of the techniques you can use to provide the certificate information to encode the credentials for transmission. Note also that the behavior just defined is not a part of any service by default. The service must specify this behavior by setting the behaviorConfiguration attribute to the name of the behavior (CustomValidator in this example). Also, the client must ensure that the client credential type is set to UserName.
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User-Level Security
To actually provide the credentials requires just a small piece of coding on the client side. If you are using the ChannelFactory class to create a proxy, the following code will submit a set of credentials with the request, and it will use the configuration information associated with the endpoint that has a name attribute of DemoEndpoint:
' VB Dim factory As New _ ChannelFactory(Of IUpdateService)("DemoEndpoint") factory.Credentials.UserName.UserName = "anyuser" factory.Credentials.UserName.Password = "good" // C# ChannelFactory<IUpdateService> factory = new ChannelFactory<IUpdateService>("DemoEndpoint"); factory.Credentials.UserName.UserName = "anyuser"; factory.Credentials.UserName.Password = "good";
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