chrome/browser/policy/policy_path_parser_win.cc

   1 // Copyright (c) 2011 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 #include <shlobj.h>
   6 #include <wtsapi32.h>
   7 #pragma comment(lib, "wtsapi32.lib")
   8
   9 #include "chrome/browser/policy/policy_path_parser.h"
  10
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/win/registry.h"
  14 #include "chrome/common/chrome_switches.h"
  15 #include "policy/policy_constants.h"
  16
  17 namespace {
  18
  19 // Checks if the key exists in the given hive and expands any string variables.
  20 bool LoadUserDataDirPolicyFromRegistry(HKEY hive, base::FilePath* dir) {
  21   std::wstring value;
  22   std::wstring key_name(base::ASCIIToWide(policy::key::kUserDataDir));
  23   base::win::RegKey key(hive, policy::kRegistryChromePolicyKey, KEY_READ);
  24   if (key.ReadValue(key_name.c_str(), &value) == ERROR_SUCCESS) {
  25     *dir = base::FilePath(policy::path_parser::ExpandPathVariables(value));
  26     return true;
  27   }
  28   return false;
  29 }
  30
  31 const WCHAR* kMachineNamePolicyVarName = L"${machine_name}";
  32 const WCHAR* kUserNamePolicyVarName = L"${user_name}";
  33 const WCHAR* kWinDocumentsFolderVarName = L"${documents}";
  34 const WCHAR* kWinLocalAppDataFolderVarName = L"${local_app_data}";
  35 const WCHAR* kWinRoamingAppDataFolderVarName = L"${roaming_app_data}";
  36 const WCHAR* kWinProfileFolderVarName = L"${profile}";
  37 const WCHAR* kWinProgramDataFolderVarName = L"${global_app_data}";
  38 const WCHAR* kWinProgramFilesFolderVarName = L"${program_files}";
  39 const WCHAR* kWinWindowsFolderVarName = L"${windows}";
  40 const WCHAR* kWinClientName = L"${client_name}";
  41
  42 struct WinFolderNamesToCSIDLMapping {
  43   const WCHAR* name;
  44   int id;
  45 };
  46
  47 // Mapping from variable names to Windows CSIDL ids.
  48 const WinFolderNamesToCSIDLMapping win_folder_mapping[] = {
  49     { kWinWindowsFolderVarName,        CSIDL_WINDOWS},
  50     { kWinProgramFilesFolderVarName,   CSIDL_PROGRAM_FILES},
  51     { kWinProgramDataFolderVarName,    CSIDL_COMMON_APPDATA},
  52     { kWinProfileFolderVarName,        CSIDL_PROFILE},
  53     { kWinLocalAppDataFolderVarName,   CSIDL_LOCAL_APPDATA},
  54     { kWinRoamingAppDataFolderVarName, CSIDL_APPDATA},
  55     { kWinDocumentsFolderVarName,      CSIDL_PERSONAL}
  56 };
  57
  58 }  // namespace
  59
  60 namespace policy {
  61
  62 namespace path_parser {
  63
  64 // Replaces all variable occurances in the policy string with the respective
  65 // system settings values.
  66 base::FilePath::StringType ExpandPathVariables(
  67     const base::FilePath::StringType& untranslated_string) {
  68   base::FilePath::StringType result(untranslated_string);
  69   if (result.length() == 0)
  70     return result;
  71   // Sanitize quotes in case of any around the whole string.
  72   if (result.length() > 1 &&
  73       ((result[0] == L'"' && result[result.length() - 1] == L'"') ||
  74        (result[0] == L'\'' && result[result.length() - 1] == L'\''))) {
  75     // Strip first and last char which should be matching quotes now.
  76     result = result.substr(1, result.length() - 2);
  77   }
  78   // First translate all path variables we recognize.
  79   for (int i = 0; i < arraysize(win_folder_mapping); ++i) {
  80     size_t position = result.find(win_folder_mapping[i].name);
  81     if (position != std::wstring::npos) {
  82       WCHAR path[MAX_PATH];
  83       ::SHGetSpecialFolderPath(0, path, win_folder_mapping[i].id, false);
  84       std::wstring path_string(path);
  85       result.replace(position, wcslen(win_folder_mapping[i].name), path_string);
  86     }
  87   }
  88   // Next translate other windows specific variables.
  89   size_t position = result.find(kUserNamePolicyVarName);
  90   if (position != std::wstring::npos) {
  91     DWORD return_length = 0;
  92     ::GetUserName(NULL, &return_length);
  93     if (return_length != 0) {
  94       scoped_ptr<WCHAR[]> username(new WCHAR[return_length]);
  95       ::GetUserName(username.get(), &return_length);
  96       std::wstring username_string(username.get());
  97       result.replace(position, wcslen(kUserNamePolicyVarName), username_string);
  98     }
  99   }
 100   position = result.find(kMachineNamePolicyVarName);
 101   if (position != std::wstring::npos) {
 102     DWORD return_length = 0;
 103     ::GetComputerNameEx(ComputerNamePhysicalDnsHostname, NULL, &return_length);
 104     if (return_length != 0) {
 105       scoped_ptr<WCHAR[]> machinename(new WCHAR[return_length]);
 106       ::GetComputerNameEx(ComputerNamePhysicalDnsHostname,
 107                           machinename.get(), &return_length);
 108       std::wstring machinename_string(machinename.get());
 109       result.replace(
 110           position, wcslen(kMachineNamePolicyVarName), machinename_string);
 111     }
 112   }
 113   position = result.find(kWinClientName);
 114   if (position != std::wstring::npos) {
 115     LPWSTR buffer = NULL;
 116     DWORD buffer_length = 0;
 117     if (::WTSQuerySessionInformation(WTS_CURRENT_SERVER, WTS_CURRENT_SESSION,
 118                                      WTSClientName,
 119                                      &buffer, &buffer_length)) {
 120       std::wstring clientname_string(buffer);
 121       result.replace(position, wcslen(kWinClientName), clientname_string);
 122       ::WTSFreeMemory(buffer);
 123     }
 124   }
 125
 126   return result;
 127 }
 128
 129 void CheckUserDataDirPolicy(base::FilePath* user_data_dir) {
 130   DCHECK(user_data_dir);
 131   // Policy from the HKLM hive has precedence over HKCU.
 132   if (!LoadUserDataDirPolicyFromRegistry(HKEY_LOCAL_MACHINE, user_data_dir))
 133     LoadUserDataDirPolicyFromRegistry(HKEY_CURRENT_USER, user_data_dir);
 134 }
 135
 136 }  // namespace path_parser
 137
 138 }  // namespace policy