NTSTATUS NTAPI RtlImpersonateSelf ( IN SECURITY_IMPERSONATION_LEVEL ImpersonationLevel )
Definition at line 22 of file security.c.
{
   HANDLE ProcessToken;
   HANDLE ImpersonationToken;
   NTSTATUS Status;
   OBJECT_ATTRIBUTES ObjAttr;
   SECURITY_QUALITY_OF_SERVICE Sqos;

   PAGED_CODE_RTL();

   Status = ZwOpenProcessToken(NtCurrentProcess(),
                               TOKEN_DUPLICATE,
                               &ProcessToken);
   if (!NT_SUCCESS(Status))
   {
      DPRINT1("NtOpenProcessToken() failed (Status %lx)\n", Status);
      return(Status);
   }

   Sqos.Length = sizeof(SECURITY_QUALITY_OF_SERVICE);
   Sqos.ImpersonationLevel = ImpersonationLevel;
   Sqos.ContextTrackingMode = 0;
   Sqos.EffectiveOnly = FALSE;

   InitializeObjectAttributes(
      &ObjAttr,
      NULL,
      0,
      NULL,
      NULL
      );

   ObjAttr.SecurityQualityOfService = &Sqos;

   Status = ZwDuplicateToken(ProcessToken,
                             TOKEN_IMPERSONATE,
                             &ObjAttr,
                             Sqos.EffectiveOnly, /* why both here _and_ in Sqos? */
                             TokenImpersonation,
                             &ImpersonationToken);
   if (!NT_SUCCESS(Status))
   {
      DPRINT1("NtDuplicateToken() failed (Status %lx)\n", Status);
      NtClose(ProcessToken);
      return(Status);
   }

   Status = ZwSetInformationThread(NtCurrentThread(),
                                   ThreadImpersonationToken,
                                   &ImpersonationToken,
                                   sizeof(HANDLE));
   if (!NT_SUCCESS(Status))
   {
     DPRINT1("NtSetInformationThread() failed (Status %lx)\n", Status);
   }

   ZwClose(ImpersonationToken);
   ZwClose(ProcessToken);

   return(Status);
}
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