2 // System.Security.Principal.WindowsImpersonationContext
5 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
6 // Sebastien Pouliot (sebastien@ximian.com)
8 // (C) 2002 Ximian, Inc (http://www.ximian.com)
9 // (C) 2004 Novell (http://www.novell.com)
13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 using System.Runtime.CompilerServices;
37 using System.Security;
39 namespace System.Security.Principal {
41 public class WindowsImpersonationContext {
43 private IntPtr _token;
46 internal WindowsImpersonationContext (IntPtr token)
48 // we get a copy to control it's lifetime
49 _token = DuplicateToken (token);
50 if (!SetCurrentToken (token)) {
51 throw new SecurityException ("Couldn't impersonate token.");
56 ~WindowsImpersonationContext ()
65 if (!RevertToSelf ()) {
67 throw new SecurityException ("Couldn't switch back to original token.");
71 GC.SuppressFinalize (this);
74 // see mono/mono/metadata/security.c for implementation
76 [MethodImplAttribute (MethodImplOptions.InternalCall)]
77 private extern static bool CloseToken (IntPtr token);
79 [MethodImplAttribute (MethodImplOptions.InternalCall)]
80 private extern static IntPtr DuplicateToken (IntPtr token);
82 [MethodImplAttribute (MethodImplOptions.InternalCall)]
83 private extern static bool SetCurrentToken (IntPtr token);
85 [MethodImplAttribute (MethodImplOptions.InternalCall)]
86 private extern static bool RevertToSelf ();