src/chrome/browser/password_manager/password_manager_util_win.cc

   1 // Copyright 2013 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 // windows.h must be first otherwise Win8 SDK breaks.
   6 #include <windows.h>
   7 #include <LM.h>
   8 #include <wincred.h>
   9
  10 // SECURITY_WIN32 must be defined in order to get
  11 // EXTENDED_NAME_FORMAT enumeration.
  12 #define SECURITY_WIN32 1
  13 #include <security.h>
  14 #undef SECURITY_WIN32
  15
  16 #include "chrome/browser/password_manager/password_manager_util.h"
  17
  18 #include "base/prefs/pref_registry_simple.h"
  19 #include "base/prefs/pref_service.h"
  20 #include "base/strings/utf_string_conversions.h"
  21 #include "base/time/time.h"
  22 #include "base/win/windows_version.h"
  23 #include "chrome/browser/browser_process.h"
  24 #include "chrome/grit/chromium_strings.h"
  25 #include "components/password_manager/core/browser/password_manager.h"
  26 #include "components/password_manager/core/common/password_manager_pref_names.h"
  27 #include "content/public/browser/render_view_host.h"
  28 #include "content/public/browser/render_widget_host_view.h"
  29 #include "ui/base/l10n/l10n_util.h"
  30
  31 #if defined(USE_AURA)
  32 #include "ui/aura/window.h"
  33 #include "ui/aura/window_tree_host.h"
  34 #endif
  35
  36 // static
  37 void password_manager::PasswordManager::RegisterLocalPrefs(
  38     PrefRegistrySimple* registry) {
  39   registry->RegisterInt64Pref(password_manager::prefs::kOsPasswordLastChanged,
  40                               0);
  41   registry->RegisterBooleanPref(password_manager::prefs::kOsPasswordBlank,
  42                                 false);
  43 }
  44
  45 namespace password_manager_util {
  46
  47 const unsigned kMaxPasswordRetries = 3;
  48
  49 const unsigned kCredUiDefaultFlags =
  50     CREDUI_FLAGS_GENERIC_CREDENTIALS |
  51     CREDUI_FLAGS_EXCLUDE_CERTIFICATES |
  52     CREDUI_FLAGS_KEEP_USERNAME |
  53     CREDUI_FLAGS_ALWAYS_SHOW_UI |
  54     CREDUI_FLAGS_DO_NOT_PERSIST;
  55
  56 static int64 GetPasswordLastChanged(WCHAR* username) {
  57   LPUSER_INFO_1 user_info = NULL;
  58   DWORD age = 0;
  59
  60   NET_API_STATUS ret = NetUserGetInfo(NULL, username, 1, (LPBYTE*) &user_info);
  61
  62   if (ret == NERR_Success) {
  63     // Returns seconds since last password change.
  64     age = user_info->usri1_password_age;
  65     NetApiBufferFree(user_info);
  66   } else {
  67     return -1;
  68   }
  69
  70   base::Time changed = base::Time::Now() - base::TimeDelta::FromSeconds(age);
  71
  72   return changed.ToInternalValue();
  73 }
  74
  75 static bool CheckBlankPassword(WCHAR* username) {
  76   PrefService* local_state = g_browser_process->local_state();
  77   int64 last_changed = GetPasswordLastChanged(username);
  78   bool need_recheck = true;
  79   bool blank_password = false;
  80
  81   // If we cannot determine when the password was last changed
  82   // then assume the password is not blank
  83   if (last_changed == -1)
  84     return false;
  85
  86   blank_password =
  87       local_state->GetBoolean(password_manager::prefs::kOsPasswordBlank);
  88   int64 pref_last_changed =
  89       local_state->GetInt64(password_manager::prefs::kOsPasswordLastChanged);
  90   if (pref_last_changed > 0 && last_changed <= pref_last_changed) {
  91     need_recheck = false;
  92   }
  93
  94   if (need_recheck) {
  95     HANDLE handle = INVALID_HANDLE_VALUE;
  96
  97     // Attempt to login using blank password.
  98     DWORD logon_result = LogonUser(username,
  99                                    L".",
 100                                    L"",
 101                                    LOGON32_LOGON_NETWORK,
 102                                    LOGON32_PROVIDER_DEFAULT,
 103                                    &handle);
 104
 105     // Win XP and later return ERROR_ACCOUNT_RESTRICTION for blank password.
 106     if (logon_result)
 107       CloseHandle(handle);
 108
 109     // In the case the password is blank, then LogonUser returns a failure,
 110     // handle is INVALID_HANDLE_VALUE, and GetLastError() is
 111     // ERROR_ACCOUNT_RESTRICTION.
 112     // http://msdn.microsoft.com/en-us/library/windows/desktop/ms681385
 113     blank_password = (logon_result ||
 114                       GetLastError() == ERROR_ACCOUNT_RESTRICTION);
 115   }
 116
 117   // Account for clock skew between pulling the password age and
 118   // writing to the preferences by adding a small skew factor here.
 119   last_changed += base::Time::kMicrosecondsPerSecond;
 120
 121   // Save the blank password status for later.
 122   local_state->SetBoolean(password_manager::prefs::kOsPasswordBlank,
 123                           blank_password);
 124   local_state->SetInt64(password_manager::prefs::kOsPasswordLastChanged,
 125                         last_changed);
 126
 127   return blank_password;
 128 }
 129
 130 OsPasswordStatus GetOsPasswordStatus() {
 131   DWORD username_length = CREDUI_MAX_USERNAME_LENGTH;
 132   WCHAR username[CREDUI_MAX_USERNAME_LENGTH+1] = {};
 133   OsPasswordStatus retVal = PASSWORD_STATUS_UNKNOWN;
 134
 135   if (GetUserNameEx(NameUserPrincipal, username, &username_length)) {
 136     // If we are on a domain, it is almost certain that the password is not
 137     // blank, but we do not actively check any further than this to avoid any
 138     // failed login attempts hitting the domain controller.
 139     retVal = PASSWORD_STATUS_WIN_DOMAIN;
 140   } else {
 141     username_length = CREDUI_MAX_USERNAME_LENGTH;
 142     if (GetUserName(username, &username_length)) {
 143       retVal = CheckBlankPassword(username) ? PASSWORD_STATUS_BLANK :
 144           PASSWORD_STATUS_NONBLANK;
 145     }
 146   }
 147
 148   return retVal;
 149 }
 150
 151 bool AuthenticateUser(gfx::NativeWindow window) {
 152   bool retval = false;
 153   CREDUI_INFO cui = {};
 154   WCHAR username[CREDUI_MAX_USERNAME_LENGTH+1] = {};
 155   WCHAR displayname[CREDUI_MAX_USERNAME_LENGTH+1] = {};
 156   WCHAR password[CREDUI_MAX_PASSWORD_LENGTH+1] = {};
 157   DWORD username_length = CREDUI_MAX_USERNAME_LENGTH;
 158   base::string16 product_name = l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
 159   base::string16 password_prompt =
 160       l10n_util::GetStringUTF16(IDS_PASSWORDS_PAGE_AUTHENTICATION_PROMPT);
 161   HANDLE handle = INVALID_HANDLE_VALUE;
 162   int tries = 0;
 163   bool use_displayname = false;
 164   bool use_principalname = false;
 165   DWORD logon_result = 0;
 166
 167   // Disable password manager reauthentication before Windows 7.
 168   // This is because of an interaction between LogonUser() and the sandbox.
 169   // http://crbug.com/345916
 170   if (base::win::GetVersion() < base::win::VERSION_WIN7)
 171     return true;
 172
 173   // On a domain, we obtain the User Principal Name
 174   // for domain authentication.
 175   if (GetUserNameEx(NameUserPrincipal, username, &username_length)) {
 176     use_principalname = true;
 177   } else {
 178     username_length = CREDUI_MAX_USERNAME_LENGTH;
 179     // Otherwise, we're a workstation, use the plain local username.
 180     if (!GetUserName(username, &username_length)) {
 181       DLOG(ERROR) << "Unable to obtain username " << GetLastError();
 182       return false;
 183     } else {
 184       // As we are on a workstation, it's possible the user
 185       // has no password, so check here.
 186       if (CheckBlankPassword(username))
 187         return true;
 188     }
 189   }
 190
 191   // Try and obtain a friendly display name.
 192   username_length = CREDUI_MAX_USERNAME_LENGTH;
 193   if (GetUserNameEx(NameDisplay, displayname, &username_length))
 194     use_displayname = true;
 195
 196   cui.cbSize = sizeof(CREDUI_INFO);
 197   cui.hwndParent = NULL;
 198 #if defined(USE_AURA)
 199   cui.hwndParent = window->GetHost()->GetAcceleratedWidget();
 200 #else
 201   cui.hwndParent = window;
 202 #endif
 203
 204   cui.pszMessageText = password_prompt.c_str();
 205   cui.pszCaptionText = product_name.c_str();
 206
 207   cui.hbmBanner = NULL;
 208   BOOL save_password = FALSE;
 209   DWORD credErr = NO_ERROR;
 210
 211   do {
 212     tries++;
 213
 214     // TODO(wfh) Make sure we support smart cards here.
 215     credErr = CredUIPromptForCredentials(
 216         &cui,
 217         product_name.c_str(),
 218         NULL,
 219         0,
 220         use_displayname ? displayname : username,
 221         CREDUI_MAX_USERNAME_LENGTH+1,
 222         password,
 223         CREDUI_MAX_PASSWORD_LENGTH+1,
 224         &save_password,
 225         kCredUiDefaultFlags |
 226         (tries > 1 ? CREDUI_FLAGS_INCORRECT_PASSWORD : 0));
 227
 228     if (credErr == NO_ERROR) {
 229       logon_result = LogonUser(username,
 230                                use_principalname ? NULL : L".",
 231                                password,
 232                                LOGON32_LOGON_NETWORK,
 233                                LOGON32_PROVIDER_DEFAULT,
 234                                &handle);
 235       if (logon_result) {
 236         retval = true;
 237         CloseHandle(handle);
 238       } else {
 239         if (GetLastError() == ERROR_ACCOUNT_RESTRICTION &&
 240             wcslen(password) == 0) {
 241           // Password is blank, so permit.
 242           retval = true;
 243         } else {
 244           DLOG(WARNING) << "Unable to authenticate " << GetLastError();
 245         }
 246       }
 247       SecureZeroMemory(password, sizeof(password));
 248     }
 249   } while (credErr == NO_ERROR &&
 250            (retval == false && tries < kMaxPasswordRetries));
 251   return retval;
 252 }
 253
 254 }  // namespace password_manager_util