public HostedImpersonationContext()
{
if (ServiceHostingEnvironment.AspNetCompatibilityEnabled)
{
int error;
bool isSuccess = SafeNativeMethods.OpenCurrentThreadTokenCritical(TokenAccessLevels.Query | TokenAccessLevels.Impersonate,
true, out tokenHandle, out error);
if (isSuccess)
{
isImpersonated = true;
Interlocked.Increment(ref refCount);
}
else
{
CloseInvalidOutSafeHandleCritical(tokenHandle);
tokenHandle = null;
if (error != SafeNativeMethods.ERROR_NO_TOKEN)
{
throw FxTrace.Exception.AsError(new Win32Exception(error, SR.Hosting_ImpersonationFailed));
}
}
}
}
private static extern bool OpenThreadTokenCritical([In] IntPtr ThreadHandle, [In] TokenAccessLevels DesiredAccess, [In] bool OpenAsSelf, out SafeCloseHandleCritical TokenHandle);
internal static bool OpenCurrentThreadTokenCritical(TokenAccessLevels desiredAccess, bool openAsSelf, out SafeCloseHandleCritical tokenHandle, out int error)
{
bool flag = OpenThreadTokenCritical(GetCurrentThread(), desiredAccess, openAsSelf, out tokenHandle);
error = Marshal.GetLastWin32Error();
return flag;
}
private static extern bool OpenThreadTokenCritical([In] IntPtr ThreadHandle, [In] TokenAccessLevels DesiredAccess, [In] bool OpenAsSelf, out SafeCloseHandleCritical TokenHandle);
internal static bool OpenCurrentThreadTokenCritical(TokenAccessLevels desiredAccess, bool openAsSelf, out SafeCloseHandleCritical tokenHandle, out int error)
{
bool flag = OpenThreadTokenCritical(GetCurrentThread(), desiredAccess, openAsSelf, out tokenHandle);
error = Marshal.GetLastWin32Error();
return(flag);
}
public void Release()
{
if (IsImpersonated)
{
Fx.Assert(tokenHandle != null, "The token handle is incorrectly released earlier.");
int currentCount = Interlocked.Decrement(ref refCount);
if (currentCount == 0)
{
lock (tokenHandle)
{
tokenHandle.Close();
tokenHandle = null;
}
}
}
}
