src/rlz/win/lib/process_info.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // Information about the current process.
   6
   7 #include "rlz/win/lib/process_info.h"
   8
   9 #include <windows.h>
  10
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/process/process_handle.h"
  13 #include "base/strings/string16.h"
  14 #include "base/win/scoped_handle.h"
  15 #include "base/win/win_util.h"
  16 #include "base/win/windows_version.h"
  17 #include "rlz/lib/assert.h"
  18
  19 namespace {
  20
  21 HRESULT GetElevationType(PTOKEN_ELEVATION_TYPE elevation) {
  22   if (!elevation)
  23     return E_POINTER;
  24
  25   *elevation = TokenElevationTypeDefault;
  26
  27   if (base::win::GetVersion() < base::win::VERSION_VISTA)
  28     return E_FAIL;
  29
  30   HANDLE process_token;
  31   if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &process_token))
  32     return HRESULT_FROM_WIN32(GetLastError());
  33
  34   base::win::ScopedHandle scoped_process_token(process_token);
  35
  36   DWORD size;
  37   TOKEN_ELEVATION_TYPE elevation_type;
  38   if (!GetTokenInformation(process_token, TokenElevationType, &elevation_type,
  39                            sizeof(elevation_type), &size)) {
  40     return HRESULT_FROM_WIN32(GetLastError());
  41   }
  42
  43   *elevation = elevation_type;
  44   return S_OK;
  45 }
  46
  47 // based on http://msdn2.microsoft.com/en-us/library/aa376389.aspx
  48 bool GetUserGroup(long* group) {
  49   if (!group)
  50     return false;
  51
  52   *group = 0;
  53
  54   // groups are listed in DECREASING order of importance
  55   // (eg. If a user is a member of both the admin group and
  56   // the power user group, it is more useful to list the user
  57   // as an admin)
  58   DWORD user_groups[] =  {DOMAIN_ALIAS_RID_ADMINS,
  59                           DOMAIN_ALIAS_RID_POWER_USERS};
  60   SID_IDENTIFIER_AUTHORITY nt_authority = SECURITY_NT_AUTHORITY;
  61
  62   for (int i = 0; i < arraysize(user_groups) && *group == 0; ++i) {
  63     PSID current_group;
  64     if (AllocateAndInitializeSid(&nt_authority, 2,
  65                                  SECURITY_BUILTIN_DOMAIN_RID,
  66                                  user_groups[i], 0, 0, 0, 0,
  67                                  0, 0, &current_group)) {
  68       BOOL current_level;
  69       if (CheckTokenMembership(NULL, current_group, &current_level) &&
  70           current_level) {
  71         *group = user_groups[i];
  72       }
  73
  74       FreeSid(current_group);
  75     }
  76   }
  77
  78   return group != 0;
  79 }
  80 }  //anonymous
  81
  82
  83 namespace rlz_lib {
  84
  85 bool ProcessInfo::IsRunningAsSystem() {
  86   static base::string16 user_sid;
  87   if (user_sid.empty()) {
  88     if (!base::win::GetUserSidString(&user_sid))
  89       return false;
  90   }
  91   return (user_sid == L"S-1-5-18");
  92 }
  93
  94 bool ProcessInfo::HasAdminRights() {
  95   static bool evaluated = false;
  96   static bool has_rights = false;
  97
  98   if (!evaluated) {
  99     if (IsRunningAsSystem()) {
 100       has_rights = true;
 101     } else if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
 102       TOKEN_ELEVATION_TYPE elevation;
 103       base::IntegrityLevel level;
 104
 105       if (SUCCEEDED(GetElevationType(&elevation)) &&
 106         base::GetProcessIntegrityLevel(base::GetCurrentProcessHandle(), &level))
 107         has_rights = (elevation == TokenElevationTypeFull) ||
 108                      (level == base::HIGH_INTEGRITY);
 109     } else {
 110       long group = 0;
 111       if (GetUserGroup(&group))
 112         has_rights = (group == DOMAIN_ALIAS_RID_ADMINS);
 113     }
 114   }
 115
 116   evaluated = true;
 117   if (!has_rights)
 118     ASSERT_STRING("ProcessInfo::HasAdminRights: Does not have admin rights.");
 119
 120   return has_rights;
 121 }
 122
 123 };  // namespace