C# – Windows Authentication using WCF and Self Hosting

I've developed a very simple host and client which I wanted to use to test whether it would be possible for a WCF client to pass the logged on windows' user's credentials to the host service without requiring the user to re-enter their credentials or setup security.

My host config looks like this:

<configuration>
  <system.serviceModel>
    <services>
      <service name="WCFTest.CalculatorService" behaviorConfiguration="WCFTest.CalculatorBehavior">
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost:8000/WCFTest/CalculatorService/" />
            <add baseAddress = "net.tcp://localhost:9000/WCFTest/CalculatorService/" />
          </baseAddresses>
        </host>
        <endpoint address ="basicHttpEP" binding="basicHttpBinding" contract="WCFTest.ICalculatorService" bindingConfiguration="basicHttpBindingConfig"/>
        <endpoint address ="netTcpEP" binding="netTcpBinding" contract="WCFTest.ICalculatorService"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>

      </service>
    </services>
    <bindings>
      <basicHttpBinding>
        <binding name="basicHttpBindingConfig">
          <security mode="TransportCredentialOnly">
            <transport clientCredentialType="Windows" />
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior name="WCFTest.CalculatorBehavior">          
          <serviceAuthorization impersonateCallerForAllOperations="false"  principalPermissionMode="UseWindowsGroups" />
          <serviceCredentials >
            <windowsAuthentication allowAnonymousLogons="false" includeWindowsGroups="true" />
          </serviceCredentials>
          <serviceMetadata httpGetEnabled="True"/>
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

My client config looks like this:

<configuration>
    <configSections>
        <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
            <section name="WCFClient.Settings1" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpBinding_ICalculatorService" closeTimeout="00:01:00"
                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                    allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
                    useDefaultWebProxy="true">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <security mode="TransportCredentialOnly">
                        <transport clientCredentialType="Windows" proxyCredentialType="None"
                            realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>
            </basicHttpBinding>
            <netTcpBinding>
                <binding name="NetTcpBinding_ICalculatorService" closeTimeout="00:01:00"
                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                    transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"
                    hostNameComparisonMode="StrongWildcard" listenBacklog="10"
                    maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10"
                    maxReceivedMessageSize="65536">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <reliableSession ordered="true" inactivityTimeout="00:10:00"
                        enabled="false" />
                    <security mode="Transport">
                        <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
                        <message clientCredentialType="Windows" />
                    </security>
                </binding>
            </netTcpBinding>
        </bindings>
        <client>
            <endpoint address="http://ldndwm286380:8000/WCFTest/CalculatorService/basicHttpEP"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_ICalculatorService"
                contract="CalcService.ICalculatorService" name="BasicHttpBinding_ICalculatorService" />
            <endpoint address="net.tcp://ldndwm286380:9000/WCFTest/CalculatorService/netTcpEP"
                binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ICalculatorService"
                contract="CalcService.ICalculatorService" name="NetTcpBinding_ICalculatorService">
            </endpoint>
        </client>
    </system.serviceModel>
    <userSettings>
        <WCFClient.Settings1>
            <setting name="Setting" serializeAs="String">
                <value>True</value>
            </setting>
        </WCFClient.Settings1>
    </userSettings>
</configuration>

My client code is:

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Press enter to start");
        Console.ReadLine();

        CalcService.ICalculatorService httpCalcService = new CalcService.CalculatorServiceClient("BasicHttpBinding_ICalculatorService");
        Console.WriteLine(httpCalcService.AddValues(new int[] { 1, 2, 3 }).Value);
        Console.ReadLine();

        CalcService.ICalculatorService TcpCalcService = new CalcService.CalculatorServiceClient("NetTcpBinding_ICalculatorService");
        Console.WriteLine(httpCalcService.AddValues(new int[] { 5, 10, 15 }).Value);
        Console.ReadLine();
    }
}

This works fine if I run the client on my PC. If I run the client on a colleague's PC I get this exception stack on the client:

Unhandled Exception:
System.ServiceModel.Security.MessageSecurityException:
The HTTP request is unauthorized with
client authentication scheme
'Negotiate'. The authentication header
received from the server was
'Negotiate oX0we6ADCgEBonQEcm
BwBgkqhkiG9xIBAgIDAH5hMF+gAwIBBaEDAgEepBEYDzIwMTAwMzExMTAzNjAzWqUFAgMEDFimAwIBKakYGxZJTlRSQU5FVC5CQVJDQVBJTlQuQ09NqhowGK
ADAgEBoREwDxsNTERORFdNMjg2MzgwJA=='.
—> System.Net.WebException: The remote server returned an error: (401)
Unauthoriz ed. —>
System.ComponentModel.Win32Exception:
The target principal name is incorrect
at
System.Net.NTAuthentication.GetOutgoingBlob(Byte[]
incomingBlob, Boolean throwOnError,
SecurityStatus& statusCode)

at
System.Net.NTAuthentication.GetOutgoingBlob(String
incomingBlob) at
System.Net.NegotiateClient.DoAuthenticate(String
challenge, WebRequest webRequest,
ICredentials credentials, Boole an
preAuthenticate) at
System.Net.NegotiateClient.Authenticate(String
challenge, WebRequest webRequest,
ICredentials credentials) at
System.Net.AuthenticationManager.Authenticate(String
challenge, WebRequest request,
ICredentials credentials) at
System.Net.AuthenticationState.AttemptAuthenticate(HttpWebRequest
httpWebRequest, ICredentials authInfo)
at
System.Net.HttpWebRequest.CheckResubmitForAuth()
at
System.Net.HttpWebRequest.CheckResubmit(Exception&
e) — End of inner exception stack
trace — at
System.Net.HttpWebRequest.GetResponse()
at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeou t) — End of inner
exception stack trace —

Any help appreciated,

Thanks,

Nick