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.
5 // windows.h must be first otherwise Win8 SDK breaks.
10 // SECURITY_WIN32 must be defined in order to get
11 // EXTENDED_NAME_FORMAT enumeration.
12 #define SECURITY_WIN32 1
16 #include "chrome/browser/password_manager/password_manager_util.h"
18 #include "base/prefs/pref_service.h"
19 #include "base/strings/utf_string_conversions.h"
20 #include "base/time/time.h"
21 #include "base/win/windows_version.h"
22 #include "chrome/browser/browser_process.h"
23 #include "chrome/grit/chromium_strings.h"
24 #include "components/password_manager/core/browser/password_manager.h"
25 #include "components/password_manager/core/common/password_manager_pref_names.h"
26 #include "content/public/browser/render_view_host.h"
27 #include "content/public/browser/render_widget_host_view.h"
28 #include "ui/base/l10n/l10n_util.h"
31 #include "ui/aura/window.h"
32 #include "ui/aura/window_tree_host.h"
35 namespace password_manager_util {
37 const unsigned kMaxPasswordRetries = 3;
39 const unsigned kCredUiDefaultFlags =
40 CREDUI_FLAGS_GENERIC_CREDENTIALS |
41 CREDUI_FLAGS_EXCLUDE_CERTIFICATES |
42 CREDUI_FLAGS_KEEP_USERNAME |
43 CREDUI_FLAGS_ALWAYS_SHOW_UI |
44 CREDUI_FLAGS_DO_NOT_PERSIST;
46 static int64 GetPasswordLastChanged(WCHAR* username) {
47 LPUSER_INFO_1 user_info = NULL;
50 NET_API_STATUS ret = NetUserGetInfo(NULL, username, 1, (LPBYTE*) &user_info);
52 if (ret == NERR_Success) {
53 // Returns seconds since last password change.
54 age = user_info->usri1_password_age;
55 NetApiBufferFree(user_info);
60 base::Time changed = base::Time::Now() - base::TimeDelta::FromSeconds(age);
62 return changed.ToInternalValue();
65 static bool CheckBlankPassword(WCHAR* username) {
66 PrefService* local_state = g_browser_process->local_state();
67 int64 last_changed = GetPasswordLastChanged(username);
68 bool need_recheck = true;
69 bool blank_password = false;
71 // If we cannot determine when the password was last changed
72 // then assume the password is not blank
73 if (last_changed == -1)
77 local_state->GetBoolean(password_manager::prefs::kOsPasswordBlank);
78 int64 pref_last_changed =
79 local_state->GetInt64(password_manager::prefs::kOsPasswordLastChanged);
80 if (pref_last_changed > 0 && last_changed <= pref_last_changed) {
85 HANDLE handle = INVALID_HANDLE_VALUE;
87 // Attempt to login using blank password.
88 DWORD logon_result = LogonUser(username,
91 LOGON32_LOGON_NETWORK,
92 LOGON32_PROVIDER_DEFAULT,
95 // Win XP and later return ERROR_ACCOUNT_RESTRICTION for blank password.
99 // In the case the password is blank, then LogonUser returns a failure,
100 // handle is INVALID_HANDLE_VALUE, and GetLastError() is
101 // ERROR_ACCOUNT_RESTRICTION.
102 // http://msdn.microsoft.com/en-us/library/windows/desktop/ms681385
103 blank_password = (logon_result ||
104 GetLastError() == ERROR_ACCOUNT_RESTRICTION);
107 // Account for clock skew between pulling the password age and
108 // writing to the preferences by adding a small skew factor here.
109 last_changed += base::Time::kMicrosecondsPerSecond;
111 // Save the blank password status for later.
112 local_state->SetBoolean(password_manager::prefs::kOsPasswordBlank,
114 local_state->SetInt64(password_manager::prefs::kOsPasswordLastChanged,
117 return blank_password;
120 OsPasswordStatus GetOsPasswordStatus() {
121 DWORD username_length = CREDUI_MAX_USERNAME_LENGTH;
122 WCHAR username[CREDUI_MAX_USERNAME_LENGTH+1] = {};
123 OsPasswordStatus retVal = PASSWORD_STATUS_UNKNOWN;
125 if (GetUserNameEx(NameUserPrincipal, username, &username_length)) {
126 // If we are on a domain, it is almost certain that the password is not
127 // blank, but we do not actively check any further than this to avoid any
128 // failed login attempts hitting the domain controller.
129 retVal = PASSWORD_STATUS_WIN_DOMAIN;
131 username_length = CREDUI_MAX_USERNAME_LENGTH;
132 if (GetUserName(username, &username_length)) {
133 retVal = CheckBlankPassword(username) ? PASSWORD_STATUS_BLANK :
134 PASSWORD_STATUS_NONBLANK;
141 bool AuthenticateUser(gfx::NativeWindow window) {
143 CREDUI_INFO cui = {};
144 WCHAR username[CREDUI_MAX_USERNAME_LENGTH+1] = {};
145 WCHAR displayname[CREDUI_MAX_USERNAME_LENGTH+1] = {};
146 WCHAR password[CREDUI_MAX_PASSWORD_LENGTH+1] = {};
147 DWORD username_length = CREDUI_MAX_USERNAME_LENGTH;
148 base::string16 product_name = l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
149 base::string16 password_prompt =
150 l10n_util::GetStringUTF16(IDS_PASSWORDS_PAGE_AUTHENTICATION_PROMPT);
151 HANDLE handle = INVALID_HANDLE_VALUE;
153 bool use_displayname = false;
154 bool use_principalname = false;
155 DWORD logon_result = 0;
157 // Disable password manager reauthentication before Windows 7.
158 // This is because of an interaction between LogonUser() and the sandbox.
159 // http://crbug.com/345916
160 if (base::win::GetVersion() < base::win::VERSION_WIN7)
163 // On a domain, we obtain the User Principal Name
164 // for domain authentication.
165 if (GetUserNameEx(NameUserPrincipal, username, &username_length)) {
166 use_principalname = true;
168 username_length = CREDUI_MAX_USERNAME_LENGTH;
169 // Otherwise, we're a workstation, use the plain local username.
170 if (!GetUserName(username, &username_length)) {
171 DLOG(ERROR) << "Unable to obtain username " << GetLastError();
174 // As we are on a workstation, it's possible the user
175 // has no password, so check here.
176 if (CheckBlankPassword(username))
181 // Try and obtain a friendly display name.
182 username_length = CREDUI_MAX_USERNAME_LENGTH;
183 if (GetUserNameEx(NameDisplay, displayname, &username_length))
184 use_displayname = true;
186 cui.cbSize = sizeof(CREDUI_INFO);
187 cui.hwndParent = NULL;
188 #if defined(USE_AURA)
189 cui.hwndParent = window->GetHost()->GetAcceleratedWidget();
191 cui.hwndParent = window;
194 cui.pszMessageText = password_prompt.c_str();
195 cui.pszCaptionText = product_name.c_str();
197 cui.hbmBanner = NULL;
198 BOOL save_password = FALSE;
199 DWORD credErr = NO_ERROR;
204 // TODO(wfh) Make sure we support smart cards here.
205 credErr = CredUIPromptForCredentials(
207 product_name.c_str(),
210 use_displayname ? displayname : username,
211 CREDUI_MAX_USERNAME_LENGTH+1,
213 CREDUI_MAX_PASSWORD_LENGTH+1,
215 kCredUiDefaultFlags |
216 (tries > 1 ? CREDUI_FLAGS_INCORRECT_PASSWORD : 0));
218 if (credErr == NO_ERROR) {
219 logon_result = LogonUser(username,
220 use_principalname ? NULL : L".",
222 LOGON32_LOGON_NETWORK,
223 LOGON32_PROVIDER_DEFAULT,
229 if (GetLastError() == ERROR_ACCOUNT_RESTRICTION &&
230 wcslen(password) == 0) {
231 // Password is blank, so permit.
234 DLOG(WARNING) << "Unable to authenticate " << GetLastError();
237 SecureZeroMemory(password, sizeof(password));
239 } while (credErr == NO_ERROR &&
240 (retval == false && tries < kMaxPasswordRetries));
244 } // namespace password_manager_util