98 lines
2.9 KiB
C#
98 lines
2.9 KiB
C#
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//
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// System.Security.Principal.WindowsImpersonationContext
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//
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// Authors:
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// Gonzalo Paniagua Javier (gonzalo@ximian.com)
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// Sebastien Pouliot (sebastien@ximian.com)
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//
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// (C) 2002 Ximian, Inc (http://www.ximian.com)
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Security;
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namespace System.Security.Principal {
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[ComVisible (true)]
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public class WindowsImpersonationContext : IDisposable {
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private IntPtr _token;
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private bool undo;
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internal WindowsImpersonationContext (IntPtr token)
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{
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// we get a copy to control it's lifetime
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_token = DuplicateToken (token);
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if (!SetCurrentToken (token)) {
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throw new SecurityException ("Couldn't impersonate token.");
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}
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undo = false;
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}
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[ComVisible (false)]
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public void Dispose ()
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{
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if (!undo) {
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Undo ();
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}
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}
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[ComVisible (false)]
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protected virtual void Dispose (bool disposing)
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{
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if (!undo) {
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Undo ();
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}
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if (disposing){
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// If we are explicitly disposed, we can avoid finalization.
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GC.SuppressFinalize (this);
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}
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}
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public void Undo ()
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{
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if (!RevertToSelf ()) {
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CloseToken (_token);
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throw new SecurityException ("Couldn't switch back to original token.");
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}
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CloseToken (_token);
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undo = true;
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GC.SuppressFinalize (this);
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}
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// see mono/mono/metadata/security.c for implementation
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private extern static bool CloseToken (IntPtr token);
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private extern static IntPtr DuplicateToken (IntPtr token);
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private extern static bool SetCurrentToken (IntPtr token);
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private extern static bool RevertToSelf ();
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}
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}
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