Fix several issues with Quick Unlock (keepassxreboot#9697)

* Fix keepassxreboot#7892 - Pressing escape when the quick unlock prompt is shown will now go back to the main unlock dialog view.
* Fix keepassxreboot#9030 - Quick unlock will be automatically invoked in the unlock dialog upon being shown.
* Fix keepassxreboot#9554 - Quick unlock application setting will be updated every time the settings widget is shown instead of just on first launch.

* Show warning that quick unlock is not enabled if user cancels Windows Hello prompt. This should limit people thinking there is a security issue. Also improve documentation describing this behavior.

* Disable quick unlock in gui tests

docs/topics/DatabaseOperations.adoc

@@ -61,7 +61,7 @@ image::database_view.png[]
 === Quick Unlock
 On Windows and macOS, subject to hardware availability, your credentials can be securely stored to enable subsequent unlocking of your database through biometric authentication. This is enabled by default on Windows using _Windows Hello_ and on macOS using _Touch ID or Apple Watch_ services. You can disable this feature in the Application Settings under the Security section.
 
-NOTE: On Windows you will be prompted to authenticate to Windows Hello on the initial database unlock. This is required to access the hardware certificate store that encrypts your credentials.
+NOTE: On Windows, you will be prompted to authenticate to Windows Hello after unlocking your database with full credentials. This is required to setup Quick Unlock. If you cancel this prompt then Quick Unlock will not be enabled and your database will continue to unlock.
 
 .Windows Hello example
 image::quick_unlock_windows_hello.png[]

share/translations/keepassxc_en.ts

@@ -1579,6 +1579,10 @@ If you do not have a key file, please leave the field empty.</source>
         <source>Failed to authenticate with Windows Hello: %1</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>Windows Hello setup was canceled or failed. Quick unlock has not been enabled.</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>DatabaseSettingWidgetMetaData</name>

src/gui/ApplicationSettingsWidget.cpp

@@ -164,15 +164,6 @@ ApplicationSettingsWidget::ApplicationSettingsWidget(QWidget* parent)
     m_generalUi->faviconTimeoutLabel->setVisible(false);
     m_generalUi->faviconTimeoutSpinBox->setVisible(false);
 #endif
-
-    bool showQuickUnlock = false;
-#if defined(Q_OS_MACOS)
-    showQuickUnlock = TouchID::getInstance().isAvailable();
-#elif defined(Q_CC_MSVC)
-    showQuickUnlock = getWindowsHello()->isAvailable();
-    connect(getWindowsHello(), &WindowsHello::availableChanged, m_secUi->quickUnlockCheckBox, &QCheckBox::setVisible);
-#endif
-    m_secUi->quickUnlockCheckBox->setVisible(showQuickUnlock);
 }
 
 ApplicationSettingsWidget::~ApplicationSettingsWidget() = default;
@@ -323,6 +314,14 @@ void ApplicationSettingsWidget::loadSettings()
     m_secUi->EnableCopyOnDoubleClickCheckBox->setChecked(
         config()->get(Config::Security_EnableCopyOnDoubleClick).toBool());
 
+    bool quickUnlockAvailable = false;
+#if defined(Q_OS_MACOS)
+    quickUnlockAvailable = TouchID::getInstance().isAvailable();
+#elif defined(Q_CC_MSVC)
+    quickUnlockAvailable = getWindowsHello()->isAvailable();
+    connect(getWindowsHello(), &WindowsHello::availableChanged, m_secUi->quickUnlockCheckBox, &QCheckBox::setEnabled);
+#endif
+    m_secUi->quickUnlockCheckBox->setEnabled(quickUnlockAvailable);
     m_secUi->quickUnlockCheckBox->setChecked(config()->get(Config::Security_QuickUnlock).toBool());
 
     for (const ExtraPage& page : asConst(m_extraPages)) {
@@ -435,7 +434,9 @@ void ApplicationSettingsWidget::saveSettings()
                   m_secUi->NoConfirmMoveEntryToRecycleBinCheckBox->isChecked());
     config()->set(Config::Security_EnableCopyOnDoubleClick, m_secUi->EnableCopyOnDoubleClickCheckBox->isChecked());
 
-    config()->set(Config::Security_QuickUnlock, m_secUi->quickUnlockCheckBox->isChecked());
+    if (m_secUi->quickUnlockCheckBox->isEnabled()) {
+        config()->set(Config::Security_QuickUnlock, m_secUi->quickUnlockCheckBox->isChecked());
+    }
 
     // Security: clear storage if related settings are disabled
     if (!config()->get(Config::RememberLastDatabases).toBool()) {

src/gui/DatabaseOpenDialog.cpp

@@ -80,6 +80,16 @@ DatabaseOpenDialog::DatabaseOpenDialog(QWidget* parent)
     connect(shortcut, &QShortcut::activated, this, [this]() { selectTabOffset(1); });
 }
 
+void DatabaseOpenDialog::showEvent(QShowEvent* event)
+{
+    QDialog::showEvent(event);
+    QTimer::singleShot(100, this, [=] {
+        if (m_view->isOnQuickUnlockScreen() && !m_view->unlockingDatabase()) {
+            m_view->triggerQuickUnlock();
+        }
+    });
+}
+
 void DatabaseOpenDialog::selectTabOffset(int offset)
 {
     if (offset == 0 || m_tabBar->count() <= 1) {

src/gui/DatabaseOpenDialog.h

@@ -58,6 +58,9 @@ public slots:
     void complete(bool accepted);
     void tabChanged(int index);
 
+protected:
+    void showEvent(QShowEvent* event) override;
+
 private:
     void selectTabOffset(int offset);
 

src/gui/DatabaseOpenWidget.cpp

@@ -139,6 +139,7 @@ DatabaseOpenWidget::DatabaseOpenWidget(QWidget* parent)
     // QuickUnlock actions
     connect(m_ui->quickUnlockButton, &QPushButton::pressed, this, [this] { openDatabase(); });
     connect(m_ui->resetQuickUnlockButton, &QPushButton::pressed, this, [this] { resetQuickUnlock(); });
+    m_ui->resetQuickUnlockButton->setShortcut(Qt::Key_Escape);
 }
 
 DatabaseOpenWidget::~DatabaseOpenWidget() = default;
@@ -284,7 +285,11 @@ void DatabaseOpenWidget::openDatabase()
             auto keyData = databaseKey->serialize();
 #if defined(Q_CC_MSVC)
             // Store the password using Windows Hello
-            getWindowsHello()->storeKey(m_filename, keyData);
+            if (!getWindowsHello()->storeKey(m_filename, keyData)) {
+                getMainWindow()->displayTabMessage(
+                    tr("Windows Hello setup was canceled or failed. Quick unlock has not been enabled."),
+                    MessageWidget::MessageType::Warning);
+            }
 #elif defined(Q_OS_MACOS)
             // Store the password using TouchID
             TouchID::getInstance().storeKey(m_filename, keyData);
@@ -534,6 +539,13 @@ bool DatabaseOpenWidget::isOnQuickUnlockScreen()
     return m_ui->centralStack->currentIndex() == 1;
 }
 
+void DatabaseOpenWidget::triggerQuickUnlock()
+{
+    if (isOnQuickUnlockScreen()) {
+        m_ui->quickUnlockButton->click();
+    }
+}
+
 /**
  * Reset installed quick unlock secrets.
  *

src/gui/DatabaseOpenWidget.h

@@ -45,9 +45,13 @@ class DatabaseOpenWidget : public DialogyWidget
     void clearForms();
     void enterKey(const QString& pw, const QString& keyFile);
     QSharedPointer<Database> database();
-    void resetQuickUnlock();
     bool unlockingDatabase();
 
+    // Quick Unlock helper functions
+    bool isOnQuickUnlockScreen();
+    void triggerQuickUnlock();
+    void resetQuickUnlock();
+
 signals:
     void dialogFinished(bool accepted);
 
@@ -56,8 +60,6 @@ class DatabaseOpenWidget : public DialogyWidget
     void hideEvent(QHideEvent* event) override;
     QSharedPointer<CompositeKey> buildDatabaseKey();
     void setUserInteractionLock(bool state);
-    // Quick Unlock helper functions
-    bool isOnQuickUnlockScreen();
 
     const QScopedPointer<Ui::DatabaseOpenWidget> m_ui;
     QSharedPointer<Database> m_db;

tests/gui/TestGuiBrowser.cpp

@@ -68,6 +68,8 @@ void TestGuiBrowser::initTestCase()
     config()->set(Config::GUI_ShowTrayIcon, true);
     // Disable the update check first time alert
     config()->set(Config::UpdateCheckMessageShown, true);
+    // Disable quick unlock
+    config()->set(Config::Security_QuickUnlock, false);
 
     m_mainWindow.reset(new MainWindow());
     m_tabWidget = m_mainWindow->findChild<DatabaseTabWidget*>("tabWidget");

tests/gui/TestGuiFdoSecrets.cpp

@@ -142,6 +142,8 @@ void TestGuiFdoSecrets::initTestCase()
     config()->set(Config::AutoSaveOnExit, false);
     config()->set(Config::GUI_ShowTrayIcon, true);
     config()->set(Config::UpdateCheckMessageShown, true);
+    // Disable quick unlock
+    config()->set(Config::Security_QuickUnlock, false);
     // Disable secret service integration (activate within individual tests to test the plugin)
     FdoSecrets::settings()->setEnabled(false);
     // activate within individual tests