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 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System
.Runtime
.CompilerServices
;
32 using System
.Runtime
.InteropServices
;
33 using System
.Security
;
35 namespace System
.Security
.Principal
{
38 public class WindowsImpersonationContext
: IDisposable
{
40 private IntPtr _token
;
43 internal WindowsImpersonationContext (IntPtr token
)
45 // we get a copy to control it's lifetime
46 _token
= DuplicateToken (token
);
47 if (!SetCurrentToken (token
)) {
48 throw new SecurityException ("Couldn't impersonate token.");
53 public void Dispose ()
61 protected virtual void Dispose (bool disposing
)
67 // If we are explicitly disposed, we can avoid finalization.
68 GC
.SuppressFinalize (this);
74 if (!RevertToSelf ()) {
76 throw new SecurityException ("Couldn't switch back to original token.");
80 GC
.SuppressFinalize (this);
83 // see mono/mono/metadata/security.c for implementation
85 [MethodImplAttribute (MethodImplOptions
.InternalCall
)]
86 private extern static bool CloseToken (IntPtr token
);
88 [MethodImplAttribute (MethodImplOptions
.InternalCall
)]
89 private extern static IntPtr
DuplicateToken (IntPtr token
);
91 [MethodImplAttribute (MethodImplOptions
.InternalCall
)]
92 private extern static bool SetCurrentToken (IntPtr token
);
94 [MethodImplAttribute (MethodImplOptions
.InternalCall
)]
95 private extern static bool RevertToSelf ();