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WindowsIdentity Class

Represents a Windows user.

System.Object
  System.Security.Principal.WindowsIdentity

Namespace:  System.Security.Principal
Assembly:  mscorlib (in mscorlib.dll)

[SerializableAttribute]
[ComVisibleAttribute(true)]
public class WindowsIdentity : IIdentity, 
	ISerializable, IDeserializationCallback, IDisposable

The WindowsIdentity type exposes the following members.

  NameDescription
Public methodWindowsIdentity(IntPtr)Initializes a new instance of the WindowsIdentity class for the user represented by the specified Windows account token.
Public methodWindowsIdentity(String)Initializes a new instance of the WindowsIdentity class for the user represented by the specified User Principal Name (UPN).
Public methodWindowsIdentity(IntPtr, String)Initializes a new instance of the WindowsIdentity class for the user represented by the specified Windows account token and the specified authentication type.
Public methodWindowsIdentity(SerializationInfo, StreamingContext)Initializes a new instance of the WindowsIdentity class for the user represented by information in a SerializationInfo stream.
Public methodWindowsIdentity(String, String)Initializes a new instance of the WindowsIdentity class for the user represented by the specified User Principal Name (UPN) and the specified authentication type.
Public methodWindowsIdentity(IntPtr, String, WindowsAccountType)Initializes a new instance of the WindowsIdentity class for the user represented by the specified Windows account token, the specified authentication type, and the specified Windows account type.
Public methodWindowsIdentity(IntPtr, String, WindowsAccountType, Boolean)Initializes a new instance of the WindowsIdentity class for the user represented by the specified Windows account token, the specified authentication type, the specified Windows account type, and the specified authentication status.
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  NameDescription
Public propertyAuthenticationTypeGets the type of authentication used to identify the user.
Public propertyGroupsGets the groups the current Windows user belongs to.
Public propertyImpersonationLevelGets the impersonation level for the user.
Public propertyIsAnonymousGets a value indicating whether the user account is identified as an anonymous account by the system.
Public propertyIsAuthenticatedGets a value indicating whether the user has been authenticated by Windows.
Public propertyIsGuestGets a value indicating whether the user account is identified as a Guest account by the system.
Public propertyIsSystemGets a value indicating whether the user account is identified as a System account by the system.
Public propertyNameGets the user's Windows logon name.
Public propertyOwnerGets the security identifier (SID) for the token owner.
Public propertyTokenGets the Windows account token for the user.
Public propertyUserGets the security identifier (SID) for the user.
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  NameDescription
Public methodDispose()Releases all resources used by the WindowsIdentity.
Protected methodDispose(Boolean)Releases the unmanaged resources used by the WindowsIdentity and optionally releases the managed resources.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodStatic memberGetAnonymousReturns a WindowsIdentity object that represents an anonymous user.
Public methodStatic memberGetCurrent()Returns a WindowsIdentity object that represents the current Windows user.
Public methodStatic memberGetCurrent(Boolean)Returns a WindowsIdentity object that represents the Windows identity for either the thread or the process, depending on the value of the ifImpersonating parameter.
Public methodStatic memberGetCurrent(TokenAccessLevels)Returns a WindowsIdentity object that represents the current Windows user, using the specified desired token access level.
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodImpersonate()Impersonates the user represented by the WindowsIdentity object.
Public methodStatic memberImpersonate(IntPtr)Impersonates the user represented by the specified user token.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate methodIDeserializationCallback.OnDeserializationInfrastructure. Implements the ISerializable interface and is called back by the deserialization event when deserialization is complete.
Explicit interface implemetationPrivate methodISerializable.GetObjectDataInfrastructure. Sets the SerializationInfo object with the logical context information needed to recreate an instance of this execution context.
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Call the GetCurrent method to create a WindowsIdentity object that represents the current user.

The following example shows the use of members of WindowsIdentity class. For an example showing how to obtain a Windows account token through a call to the unmanaged Win32 LogonUser function, and use that token to impersonate another user, see the WindowsImpersonationContext class.


using System;
using System.Security.Principal;

class WindowsIdentityMembers
{
    [STAThread]
    static void Main(string[] args)
    {
        // Retrieve the Windows account token for the current user.
        IntPtr logonToken = LogonUser();

        // Constructor implementations.
        IntPtrConstructor(logonToken);
        IntPtrStringConstructor(logonToken);
        IntPtrStringTypeConstructor(logonToken);
        IntPrtStringTypeBoolConstructor(logonToken);

        // Property implementations.
        UseProperties(logonToken);

        // Method implementations.
        GetAnonymousUser();
        ImpersonateIdentity(logonToken);

        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified Windows account token.
    private static void IntPtrConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }


    // Create a WindowsIdentity object for the user represented by the
    // specified account token and authentication type.
    private static void IntPtrStringConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account token 
        // and the specified authentication type.
        string authenticationType = "WindowsAuthentication";
        WindowsIdentity windowsIdentity =
			            new WindowsIdentity(logonToken, authenticationType);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, and Windows account
    // type.
    private static void IntPtrStringTypeConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account token,
        // and the specified authentication type, and Windows account type.
        string authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        WindowsIdentity windowsIdentity =
            new WindowsIdentity(logonToken, authenticationType, guestAccount);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }

    // Create a WindowsIdentity object for the user represented by the
    // specified account token, authentication type, Windows account type, and
    // Boolean authentication flag.
    private static void IntPrtStringTypeBoolConstructor(IntPtr logonToken)
    {
        // Construct a WindowsIdentity object using the input account token,
        // and the specified authentication type, Windows account type, and
        // authentication flag.
        string authenticationType = "WindowsAuthentication";
        WindowsAccountType guestAccount = WindowsAccountType.Guest;
        bool isAuthenticated = true;
        WindowsIdentity windowsIdentity = new WindowsIdentity(
            logonToken, authenticationType, guestAccount, isAuthenticated);

        Console.WriteLine("Created a Windows identity object named " +
            windowsIdentity.Name + ".");
    }
    // Access the properties of a WindowsIdentity object.
    private static void UseProperties(IntPtr logonToken)
    {
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);
        string propertyDescription = "The Windows identity named ";

        // Retrieve the Windows logon name from the Windows identity object.
        propertyDescription += windowsIdentity.Name;

        // Verify that the user account is not considered to be an Anonymous
        // account by the system.
        if (!windowsIdentity.IsAnonymous)
        {
            propertyDescription += " is not an Anonymous account";
        }

        // Verify that the user account has been authenticated by Windows.
        if (windowsIdentity.IsAuthenticated)
        {
            propertyDescription += ", is authenticated";
        }

        // Verify that the user account is considered to be a System account
        // by the system.
        if (windowsIdentity.IsSystem)
        {
            propertyDescription += ", is a System account";
        }
        // Verify that the user account is considered to be a Guest account
        // by the system.
        if (windowsIdentity.IsGuest)
        {
            propertyDescription += ", is a Guest account";
        }

        // Retrieve the authentication type for the 
        String authenticationType = windowsIdentity.AuthenticationType;

        // Append the authenication type to the output message.
        if (authenticationType != null)
        {
            propertyDescription += (" and uses " + authenticationType);
            propertyDescription += (" authentication type.");
        }

        Console.WriteLine(propertyDescription);

        // Display the SID for the owner.
        Console.Write("The SID for the owner is : ");
        SecurityIdentifier si = windowsIdentity.Owner;
        Console.WriteLine(si.ToString());
        // Display the SIDs for the groups the current user belongs to.
        Console.WriteLine("Display the SIDs for the groups the current user belongs to.");
        IdentityReferenceCollection irc = windowsIdentity.Groups;
        foreach (IdentityReference ir in irc)
            Console.WriteLine(ir.Value);
        TokenImpersonationLevel token = windowsIdentity.ImpersonationLevel;
        Console.WriteLine("The impersonation level for the current user is : " + token.ToString());
    }

    // Retrieve the account token from the current WindowsIdentity object
    // instead of calling the unmanaged LogonUser method in the advapi32.dll.
    private static IntPtr LogonUser()
    {
        IntPtr accountToken = WindowsIdentity.GetCurrent().Token;
        Console.WriteLine( "Token number is: " + accountToken.ToString());

        return accountToken;
    }

    // Get the WindowsIdentity object for an Anonymous user.
    private static void GetAnonymousUser()
    {
        // Retrieve a WindowsIdentity object that represents an anonymous
        // Windows user.
        WindowsIdentity windowsIdentity = WindowsIdentity.GetAnonymous();
    }

    // Impersonate a Windows identity.
    private static void ImpersonateIdentity(IntPtr logonToken)
    {
        // Retrieve the Windows identity using the specified token.
        WindowsIdentity windowsIdentity = new WindowsIdentity(logonToken);

        // Create a WindowsImpersonationContext object by impersonating the
        // Windows identity.
        WindowsImpersonationContext impersonationContext =
            windowsIdentity.Impersonate();

        Console.WriteLine("Name of the identity after impersonation: "
            + WindowsIdentity.GetCurrent().Name + ".");
        Console.WriteLine(windowsIdentity.ImpersonationLevel);
        // Stop impersonating the user.
        impersonationContext.Undo();

        // Check the identity name.
        Console.Write("Name of the identity after performing an Undo on the");
        Console.WriteLine(" impersonation: " +
            WindowsIdentity.GetCurrent().Name);
    }
}



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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