lib/ntdll/rtl/security.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            lib/ntdll/rtl/security.c
   6  * PURPOSE:         Miscellaneous securitiy related functions
   7  * PROGRAMMER:      Eric Kohl
   8  * UPDATE HISTORY:
   9  *                  21/11/2001 Created
  10  */
  11
  12 #include <ddk/ntddk.h>
  13 #include <ntdll/rtl.h>
  14
  15
  16 NTSTATUS STDCALL
  17 RtlImpersonateSelf(IN SECURITY_IMPERSONATION_LEVEL ImpersonationLevel)
  18 {
  19   OBJECT_ATTRIBUTES ObjectAttributes;
  20   SECURITY_QUALITY_OF_SERVICE SecQos;
  21   HANDLE ProcessToken;
  22   HANDLE ImpersonationToken;
  23   NTSTATUS Status;
  24
  25   Status = NtOpenProcessToken(NtCurrentProcess(),
  26                               TOKEN_DUPLICATE,
  27                               &ProcessToken);
  28   if (!NT_SUCCESS(Status))
  29     return(Status);
  30
  31   SecQos.Length = sizeof(SECURITY_QUALITY_OF_SERVICE);
  32   SecQos.ImpersonationLevel = ImpersonationLevel;
  33   SecQos.ContextTrackingMode = SECURITY_DYNAMIC_TRACKING;
  34   SecQos.EffectiveOnly = FALSE;
  35
  36   ObjectAttributes.Length = sizeof(OBJECT_ATTRIBUTES);
  37   ObjectAttributes.RootDirectory = 0;
  38   ObjectAttributes.ObjectName = NULL;
  39   ObjectAttributes.Attributes = 0;
  40   ObjectAttributes.SecurityDescriptor = NULL;
  41   ObjectAttributes.SecurityQualityOfService = &SecQos;
  42
  43   Status = NtDuplicateToken(ProcessToken,
  44                             TOKEN_IMPERSONATE,
  45                             &ObjectAttributes,
  46                             0,
  47                             TokenImpersonation,
  48                             &ImpersonationToken);
  49   if (!NT_SUCCESS(Status))
  50     {
  51       NtClose(ProcessToken);
  52       return(Status);
  53     }
  54
  55   Status = NtSetInformationThread(NtCurrentThread(),
  56                                   ThreadImpersonationToken,
  57                                   &ImpersonationToken,
  58                                   sizeof(HANDLE));
  59   NtClose(ImpersonationToken);
  60   NtClose(ProcessToken);
  61
  62   return(Status);
  63 }
  64
  65 /* EOF */