Get Windows username via WCF Data Services (Silverlight) - windows

Question

I'm trying get the windows username for my silverlight 4 application using WCF Data Services. I'm seeing the username when I'm debugging the application from my local machine. But when I'm running the application from web server, the username is coming out as null.
Please let me know if you need any other details. Any help is greatly appreciated.
Here is the method I'm using to get the username :
[OperationContract]
public string GetWindowsUsername()
{
string usr = HttpContext.Current.User.Identity.Name;
return usr.ToString();
}
Here is my Web.Config :
<system.web>
<compilation debug="true" targetFramework="4.0" />
<httpRuntime maxRequestLength="2147483647" />
<authentication mode="Windows" />
<!--<anonymousIdentification enabled="true"/>-->
<authorization>
<allow users="*"/>
</authorization>
<!--<identity impersonate="false" />-->
</system.web>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
<dataContractSerializer maxItemsInObjectGraph="2147483647" />
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<basicHttpBinding>
<binding name="OrderTrackingSystem.Web.OTSService.customBinding0"
maxBufferPoolSize="2147483647" maxBufferSize="2147483647"
maxReceivedMessageSize="2147483647" transferMode="Streamed">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security>
<transport clientCredentialType="Ntlm" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
<services>
<service name="OrderTrackingSystem.Web.OTSService">
<endpoint address="" binding="basicHttpBinding" bindingConfiguration="OrderTrackingSystem.Web.OTSService.customBinding0"
name="OTSServiceCustom" contract="OrderTrackingSystem.Web.OTSService" />
</service>
</services>
</system.serviceModel>
Here is my Service Config :
<configuration>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="OTSServiceCustom" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" />
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:49458/OTSService.svc" binding="basicHttpBinding"
bindingConfiguration="OTSServiceCustom" contract="OTSProxy.OTSService"
name="OTSServiceCustom" />
</client>
</system.serviceModel>
</configuration>

Answer 1

I tried to create a demo app to test things, the following worked for me..
[OperationContract]
public string GetWindowsUsername()
{
string usr = ServiceSecurityContext.Current.WindowsIdentity.Name;
return usr;
}
But inorder to make this work you have to configure your binding as:
<bindings>
<basicHttpBinding>
<binding name="OTSServiceCustom">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Ntlm" proxyCredentialType="None" />
</security>
</binding>
</basicHttpBinding>
</bindings>
Hope this helps...