System.Security.Principal (mscorlib.dll)class
public class WindowsIdentity : IIdentity, System.Runtime.Serialization.ISerializable,          System.Runtime.Serialization.IDeserializationCallback { // Public Constructors    public WindowsIdentity(IntPtr userToken);    public WindowsIdentity(IntPtr userToken, string type);    public WindowsIdentity(IntPtr userToken, string type, WindowsAccountType acctType);    public WindowsIdentity(IntPtr userToken, string type, WindowsAccountType acctType, bool isAuthenticated);    public WindowsIdentity(System.Runtime.Serialization.SerializationInfo info,        System.Runtime.Serialization.StreamingContext context);    public WindowsIdentity(string sUserPrincipalName);    public WindowsIdentity(string sUserPrincipalName, string type); // Public Instance Properties    public virtual string AuthenticationType{get; } // implements IIdentity    public virtual bool IsAnonymous{get; }    public virtual bool IsAuthenticated{get; }  // implements IIdentity    public virtual bool IsGuest{get; }    public virtual bool IsSystem{get; }    public virtual string Name{get; }  // implements IIdentity    public virtual IntPtr Token{get; } // Public Static Methods    public static WindowsIdentity GetAnonymous(  );    public static WindowsIdentity GetCurrent(  );    public static WindowsImpersonationContext Impersonate(IntPtr userToken); // Public Instance Methods    public virtual WindowsImpersonationContext Impersonate(  ); // Protected Instance Methods    protected override void Finalize(  );         // overrides object }

The WindowsIdentity class provides an IIdentity implementation that represents a Windows user. Because WindowsIdentity is Windows-specific, it implements members useful for working with Windows user accounts in addition to the minimum functionality defined by IIdentity.

The static GetCurrent( ) method returns a WindowsIdentity object representing the currently logged-on Windows user, and the staticGetAnonymous( ) method returns a WindowsIdentity object representing an anonymous Windows user. The WindowsIdentity constructors support creation of WindowsIdentity objects that represent users other than the active user. Each constructor requires a Windows access token representing the desired user. A handle to the Windows access token is passed to the constructor wrapped in a System.IntPtr object. The Windows access token is usually obtained through a call to unmanaged code, such as the LogonUser( ) method of the advapi32.dllWin32 library. The access token for an existing WindowsIdentity is available through its Token property. Starting with .NET 1.1, however, it is possible to construct a WindowsIdentity using a string argument containing the user Principal Name of the user, such as the value that would be passed to the LogonUser( ) API. However, this functionality is only available on Windows 2003 Server or later platforms; on any other platform, it will throw an ArgumentException.

Calling the Impersonate( ) method changes the Windows access token of the current thread to that of the user represented by the WindowsIdentity object. By creating a WindowsIdentity that represents a user other than the active Windows user, Impersonate( ) allows code to perform operating system-level impersonation. The Impersonate( ) method returns a WindowsImpersonationContext object representing the Windows access token prior to impersonation; this object must be kept in order to revert to the original access token once impersonation is no longer required.

The IsAnonymous, IsGuest, and IsSystem properties provide an easy-to-use mechanism for determining if a WindowsIdentity object represents an anonymous, guest, or system Windows user account. Determining if a WindowsIdentity represents a normal account is a process of elimination; there is no IsNormal property.

The Name property of a WindowsIdentity object will return a name in the form DOMAINNAME\USERNAME, where DOMAINNAME specifies the authority used to validate the user; for example, COMPANY_X\Gary or MY_MACHINE\Peter.

Passed To

WindowsPrincipal.WindowsPrincipal( )

Programming. NET Security
Programming .Net Security
ISBN: 0596004427
EAN: 2147483647
Year: 2005
Pages: 346

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