pc/util_winnt.c

   1 /* Utilities - Windows NT specific utilities (not in Win95)
   2    Copyright (C) 1994, 1995, 1996 the Free Software Foundation.
   3
   4    Written 1996 by Juan Grigera<grigera@isis.unlp.edu.ar>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 */
  20 #include <config.h>
  21 #include <windows.h>
  22 #include "util_win32.h"
  23 #include "trace_nt.h"
  24
  25
  26 /* int winnt_IsAdministrator() - Determines whether user has Administrator (root)
  27                    priviledges.
  28    Return: 1 if administrator
  29            0 if not
  30
  31    Note:  Code taken from MSKbase Number: Q118626.
  32
  33    To determine whether or not a user is an administrator, you need to examine
  34    the user's access token with GetTokenInformation(). The access token
  35    represents the user's privileges and the groups to which the user belongs.
  36 */
  37
  38 int winnt_IsAdministrator()
  39 {
  40    HANDLE hAccessToken;
  41    UCHAR InfoBuffer[1024];
  42    PTOKEN_GROUPS ptgGroups = (PTOKEN_GROUPS)InfoBuffer;
  43    DWORD dwInfoBufferSize;
  44    PSID psidAdministrators;
  45    SID_IDENTIFIER_AUTHORITY siaNtAuthority = SECURITY_NT_AUTHORITY;
  46    UINT x;
  47    BOOL bSuccess;
  48
  49    if(!OpenProcessToken(GetCurrentProcess(),TOKEN_READ,&hAccessToken))
  50       return 0;
  51
  52    bSuccess = GetTokenInformation(hAccessToken,TokenGroups,InfoBuffer,
  53       1024, &dwInfoBufferSize);
  54
  55    CloseHandle(hAccessToken);
  56
  57    if( !bSuccess )
  58       return 0;
  59
  60    if(!AllocateAndInitializeSid(&siaNtAuthority, 2,
  61       SECURITY_BUILTIN_DOMAIN_RID,
  62       DOMAIN_ALIAS_RID_ADMINS,
  63       0, 0, 0, 0, 0, 0,
  64       &psidAdministrators))
  65       return 0;
  66
  67    bSuccess = 0;
  68    for(x=0;x<ptgGroups->GroupCount;x++) {
  69       if( EqualSid(psidAdministrators, ptgGroups->Groups[x].Sid) ) {
  70          bSuccess = 1;
  71          break;
  72       }
  73    }
  74    FreeSid(psidAdministrators);
  75    return bSuccess;
  76 }
  77
  78
  79 int geteuid ()
  80 {
  81     if (winnt_IsAdministrator())
  82         return 0;
  83     return 1;
  84 }
  85