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//
// System.Security.SecurityContext class
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Security.Principal;
using System.Threading;
namespace System.Security {
#if NET_2_0
public sealed class SecurityContext {
#else
internal sealed class SecurityContext {
#endif
private bool _capture;
private IntPtr _winid;
private CompressedStack _stack;
private bool _suppressFlowWindowsIdentity;
private bool _suppressFlow;
internal SecurityContext ()
{
}
// copy constructor
internal SecurityContext (SecurityContext sc)
{
_capture = true;
_winid = sc._winid;
if (sc._stack != null)
_stack = sc._stack.CreateCopy ();
}
public SecurityContext CreateCopy ()
{
if (!_capture)
throw new InvalidOperationException ();
return new SecurityContext (this);
}
// static methods
static public SecurityContext Capture ()
{
SecurityContext sc = Thread.CurrentThread.ExecutionContext.SecurityContext;
if (sc.FlowSuppressed)
return null;
SecurityContext capture = new SecurityContext ();
capture._capture = true;
capture._winid = WindowsIdentity.GetCurrentToken ();
capture._stack = CompressedStack.Capture ();
return capture;
}
// internal stuff
internal bool FlowSuppressed {
get { return _suppressFlow; }
set { _suppressFlow = value; }
}
internal bool WindowsIdentityFlowSuppressed {
get { return _suppressFlowWindowsIdentity; }
set { _suppressFlowWindowsIdentity = value; }
}
internal CompressedStack CompressedStack {
get { return _stack; }
set { _stack = value; }
}
internal IntPtr IdentityToken {
get { return _winid; }
set { _winid = value; }
}
// Suppressing the SecurityContext flow wasn't required before 2.0
static public bool IsFlowSuppressed ()
{
return Thread.CurrentThread.ExecutionContext.SecurityContext.FlowSuppressed;
}
static public bool IsWindowsIdentityFlowSuppressed ()
{
return Thread.CurrentThread.ExecutionContext.SecurityContext.WindowsIdentityFlowSuppressed;
}
static public void RestoreFlow ()
{
SecurityContext sc = Thread.CurrentThread.ExecutionContext.SecurityContext;
// if nothing is suppressed then throw
if (!sc.FlowSuppressed && !sc.WindowsIdentityFlowSuppressed)
throw new InvalidOperationException ();
sc.FlowSuppressed = false;
sc.WindowsIdentityFlowSuppressed = false;
}
#if NET_2_0
// if you got the context then you can use it
[SecurityPermission (SecurityAction.Assert, ControlPrincipal = true)]
[SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
static public void Run (SecurityContext securityContext, ContextCallback callBack, object state)
{
if (securityContext == null) {
throw new InvalidOperationException (Locale.GetText (
"Null SecurityContext"));
}
SecurityContext sc = Thread.CurrentThread.ExecutionContext.SecurityContext;
IPrincipal original = Thread.CurrentPrincipal;
try {
if (sc.IdentityToken != IntPtr.Zero) {
Thread.CurrentPrincipal = new WindowsPrincipal (new WindowsIdentity (sc.IdentityToken));
}
// FIXME: is the security manager isn't active then we may not have
// a compressed stack (bug #78652)
if (securityContext.CompressedStack != null)
CompressedStack.Run (securityContext.CompressedStack, callBack, state);
else
callBack (state);
}
finally {
if ((original != null) && (sc.IdentityToken != IntPtr.Zero))
Thread.CurrentPrincipal = original;
}
}
#endif
[SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
static public AsyncFlowControl SuppressFlow ()
{
Thread t = Thread.CurrentThread;
// suppress both flows
t.ExecutionContext.SecurityContext.FlowSuppressed = true;
t.ExecutionContext.SecurityContext.WindowsIdentityFlowSuppressed = true;
return new AsyncFlowControl (t, AsyncFlowControlType.Security);
}
static public AsyncFlowControl SuppressFlowWindowsIdentity ()
{
Thread t = Thread.CurrentThread;
t.ExecutionContext.SecurityContext.WindowsIdentityFlowSuppressed = true;
return new AsyncFlowControl (t, AsyncFlowControlType.Security);
}
}
}
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