How do you get Windows user domain/username with C# Razor on IIS 10?

Question

Trying to build a web app that will utilize single-sign-on using Windows authentication with Active Directory. I'm having trouble getting the logged in Windows user domain and username. Things I have tried:

• WindowsIdentity.GetCurrent().Name

  Returns IIS APPPOOL\DefaultAppPool

• System.Environment.UserName

  Returns DefaultAppPool

• Page.User.Identity.Name

  Results in a compilation error

  
  Anonymous Authentication is disabled
  ASP.NET Impersonation is enabled
  Windows Authentication is enabled

  
  Web.config

  <?xml version="1.0" encoding="utf-8"?>
  <configuration>
    <appSettings>
      <add key="EnableSimpleMembership" value="false" />
    </appSettings>
    <system.web>
      <compilation debug="false" targetFramework="4.6.1">
        <assemblies>
          <add assembly="System.Net.Http, Version=4.1.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
          <add assembly="Microsoft.Web.Administration, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        </assemblies>
      </compilation>
      <httpRuntime targetFramework="4.6.1" />
      <authentication mode="Windows" />
      <authorization>
        <deny users="?" />
      </authorization>
      <identity impersonate="true" />
    </system.web>
    <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
          <assemblyIdentity name="System.Security.Cryptography.X509Certificates" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
          <bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" />
        </dependentAssembly>
        <dependentAssembly>
          <assemblyIdentity name="Microsoft.Win32.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
          <bindingRedirect oldVersion="0.0.0.0-4.0.1.0" newVersion="4.0.1.0" />
        </dependentAssembly>
        <dependentAssembly>
          <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
          <bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" />
        </dependentAssembly>
        <dependentAssembly>
          <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
          <bindingRedirect oldVersion="0.0.0.0-9.0.0.0" newVersion="9.0.0.0" />
        </dependentAssembly>
      </assemblyBinding>
    </runtime>
    <system.webServer>
      <modules runAllManagedModulesForAllRequests="true">
      </modules>
      <validation validateIntegratedModeConfiguration="false" />
      <handlers>
        <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
        <remove name="OPTIONSVerbHandler" />
        <remove name="TRACEVerbHandler" />
        <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
      </handlers>
    </system.webServer>
  </configuration>
  

Answer 1

Try the following:

var windowsIdentity = System.Web.HttpContext.Current.User.Identity as WindowsIdentity;

Answer 2

You might have to adjust, depending on on the context that you are trying to access the current user

e.g. from a Controller you can do the following:

User.Identity.GetUserId();

make sure that you are using:

using Microsoft.AspNet.Identity;