Windows: Add tooltip message and help button for new option to disable memory protection

Also a dedicated page in the documentation was added for it.

src/Common/Dlgcode.c

@@ -1759,6 +1759,88 @@ void AccommodateTextField (HWND hwndDlg, UINT ctrlId, BOOL bFirstUpdate, HFONT h
 	}
 }
 
+// Resizes width of a checkbox according to actual width in pixels of its label text (font size is taken into account)
+void AccommodateCheckBoxTextWidth (HWND hwndDlg, UINT ctrlId)
+{
+	RECT rec;
+	HWND hwndCtrl = GetDlgItem (hwndDlg, ctrlId);
+	int width, origWidth, origHeight;
+	int horizSubOffset;
+	wchar_t text [MAX_URL_LENGTH];
+	HFONT hFont = (HFONT) SendDlgItemMessage (hwndDlg, ctrlId, WM_GETFONT, 0, 0);
+
+	// Resize the field according to its length and font size and move if centered or right-aligned
+
+	GetWindowTextW (hwndCtrl, text, sizeof (text) / sizeof (wchar_t));
+
+	width = GetTextGfxWidth (hwndCtrl, text, hFont);
+
+	// add to width variable value the width of the checkbox square. We use SM_CXMENUCHECK which is a little larger than actual width
+	width += GetSystemMetrics(SM_CXMENUCHECK);
+	
+
+	GetClientRect (hwndCtrl, &rec);	
+	origWidth = rec.right;
+	origHeight = rec.bottom;
+
+	if (width >= 0
+		&& (origWidth > width))	// The original width of the field is the maximum allowed size 
+	{
+		horizSubOffset = origWidth - width;
+
+		// Resize the text field
+		SetWindowPos (hwndCtrl, 0, 0, 0,
+			origWidth - horizSubOffset,
+			origHeight,
+			SWP_NOMOVE | SWP_NOZORDER);
+
+		InvalidateRect (hwndCtrl, NULL, TRUE);
+	}
+}
+
+// makes controls contiguous by moving the second control right next to the first one horizontally
+void MakeControlsContiguous(HWND hwndDlg, UINT ctrl1ID, UINT ctrl2ID) {
+    HWND hwndCtrl1 = GetDlgItem(hwndDlg, ctrl1ID);
+    HWND hwndCtrl2 = GetDlgItem(hwndDlg, ctrl2ID);
+	RECT rect1, rect2;
+	POINT pt1, pt2;
+	int newLeftPosition;
+
+    // Exit silently if one or both controls are missing
+    if (!hwndCtrl1 || !hwndCtrl2) {
+        return;
+    }
+
+    
+    GetWindowRect(hwndCtrl1, &rect1);
+    GetWindowRect(hwndCtrl2, &rect2);
+
+    // Convert the top-right point of the first control from screen to client coordinates
+    pt1.x = rect1.right;
+	pt1.y = rect1.top;
+    if (!ScreenToClient(hwndDlg, &pt1)) {
+        return; // Exit if the conversion fails
+    }
+
+    // Convert the top-left point of the second control from screen to client coordinates
+    pt2.x = rect2.left;
+	pt2.y = rect2.top;
+    if (!ScreenToClient(hwndDlg, &pt2)) {
+        return; // Exit if the conversion fails
+    }
+
+    // Ensure the second control is always placed to the right of the first one
+    newLeftPosition = pt1.x + 1;
+
+    if (pt2.x < pt1.x) { // if the second control is to the left of the first one
+        newLeftPosition += (pt1.x - pt2.x);
+    }
+
+    // Move the second control to its new position
+    SetWindowPos(hwndCtrl2, NULL, newLeftPosition, pt2.y, 0, 0, SWP_NOZORDER | SWP_NOSIZE);
+}
+
+
 // Note that the user can still close the window by right-clicking its taskbar icon and selecting 'Close window', or by pressing Alt-F4, or using the Task Manager.
 void DisableCloseButton (HWND hwndDlg)
 {
@@ -2129,6 +2211,42 @@ BOOL CALLBACK AboutDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam
 	return 0;
 }
 
+HWND CreateToolTip(int toolID, HWND hDlg, const char* strID)
+{
+    if (!toolID || !hDlg)
+    {
+        return FALSE;
+    }
+    
+    // Create the tooltip.
+    HWND hwndTip = CreateWindowExW(NULL, TOOLTIPS_CLASS, NULL,
+                              WS_POPUP | TTS_ALWAYSTIP | TTS_NOPREFIX | TTS_BALLOON,
+                              CW_USEDEFAULT, CW_USEDEFAULT,
+                              CW_USEDEFAULT, CW_USEDEFAULT,
+                              hDlg, NULL, 
+                              hInst, NULL);
+    
+   if (!hwndTip)
+   {
+       return (HWND)NULL;
+   }                              
+                              
+    // Associate the tooltip with the tool.
+    TOOLINFOW toolInfo = { 0 };
+    toolInfo.cbSize = sizeof(toolInfo);
+    toolInfo.hwnd = hDlg;
+    toolInfo.uFlags = TTF_SUBCLASS | TTF_IDISHWND;
+    toolInfo.uId = (UINT_PTR) GetDlgItem(hDlg, toolID);
+    toolInfo.lpszText = GetString(strID);
+
+	// set tooltip maximum width
+	SendMessage(hwndTip, TTM_SETMAXTIPWIDTH, 0, (LPARAM) 300);
+
+    SendMessage(hwndTip, TTM_ADDTOOL, 0, (LPARAM)&toolInfo);
+
+    return hwndTip;
+}
+
 
 static HWND StaticModelessWaitDlgHandle = NULL;
 
@@ -11093,6 +11211,10 @@ void Applink (const char *dest)
 	{
 		StringCbCopyW (page, sizeof (page),L"Personal%20Iterations%20Multiplier%20%28PIM%29.html");
 	}
+	else if (strcmp(dest, "memoryprotection") == 0)
+	{
+		StringCbCopyW (page, sizeof (page),L"VeraCrypt%20Memory%20Protection.html");
+	}
 	else
 	{
 		StringCbCopyW (url, sizeof (url),TC_APPLINK);

src/Common/Dlgcode.h

@@ -327,6 +327,7 @@ void HandCursor ();
 void AddComboPair (HWND hComboBox, const wchar_t *lpszItem, int value);
 void SelectAlgo ( HWND hComboBox , int *nCipher );
 void PopulateWipeModeCombo (HWND hComboBox, BOOL bNA, BOOL bInPlaceEncryption, BOOL bHeaderWipe);
+HWND CreateToolTip(int toolID, HWND hDlg, const char* strID);
 wchar_t *GetWipeModeName (WipeAlgorithmId modeId);
 wchar_t *GetPathType (const wchar_t *path, BOOL bUpperCase, BOOL *bIsPartition);
 LRESULT CALLBACK CustomDlgProc ( HWND hwnd , UINT uMsg , WPARAM wParam , LPARAM lParam );
@@ -532,6 +533,8 @@ void EnableCloseButton (HWND hwndDlg);
 void ToBootPwdField (HWND hwndDlg, UINT ctrlId);
 void ToNormalPwdField (HWND hwndDlg, UINT ctrlId);
 void AccommodateTextField (HWND hwndDlg, UINT ctrlId, BOOL bFirstUpdate, HFONT hFont);
+void AccommodateCheckBoxTextWidth (HWND hwndDlg, UINT ctrlId);
+void MakeControlsContiguous(HWND hwndDlg, UINT ctrl1ID, UINT ctrl2ID);
 BOOL GetDriveLabel (int driveNo, wchar_t *label, int labelSize);
 BOOL GetSysDevicePaths (HWND hwndDlg);
 BOOL DoDriverInstall (HWND hwndDlg);

src/Common/Language.xml

@@ -1633,7 +1633,8 @@
     <entry lang="en" key="EXPANDER_EXTENDING_FILESYSTEM">Extending file system ...\n</entry>
     <entry lang="en" key="PARTIAL_SYSENC_MOUNT_READONLY">Warning: The system partition you attempted to mount was not fully encrypted. As a safety measure to prevent potential corruption or unwanted modifications, volume '%s' was mounted as read-only.</entry>
     <entry lang="en" key="IDC_LINK_KEYFILES_EXTENSIONS_WARNING">Important information on using third-party file extensions</entry>
-    <entry lang="en" key="IDC_DISABLE_MEMORY_PROTECTION">Disable memory protection in VeraCrypt</entry>
+    <entry lang="en" key="IDC_DISABLE_MEMORY_PROTECTION">Disable memory protection for Accessibility tools compatibility</entry>
+    <entry lang="en" key="DISABLE_MEMORY_PROTECTION_WARNING">WARNING: Disabling memory protection significantly reduces security. Enable this option ONLY if you rely on Accessibility tools, like Screen Readers, to interact with VeraCrypt's UI.</entry>
   </localization>
   <xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
     <xs:element name="VeraCrypt">

src/Common/Resource.h

@@ -227,6 +227,7 @@
 #define IDC_KEYFILES_SIZE_UNIT          5143
 #define IDC_LINK_KEYFILES_EXTENSIONS_WARNING 5144
 #define IDC_DISABLE_MEMORY_PROTECTION   5145
+#define IDC_DISABLE_MEMORY_PROTECTION_HELP   5146
 
 // Next default values for new objects
 // 
@@ -235,7 +236,7 @@
 #define _APS_NO_MFC                     1
 #define _APS_NEXT_RESOURCE_VALUE        578
 #define _APS_NEXT_COMMAND_VALUE         40001
-#define _APS_NEXT_CONTROL_VALUE         5146
+#define _APS_NEXT_CONTROL_VALUE         5147
 #define _APS_NEXT_SYMED_VALUE           101
 #endif
 #endif

src/Mount/Mount.c

@@ -11574,6 +11574,7 @@ void NotifyService (DWORD dwNotifyCmd)
 
 static BOOL CALLBACK PerformanceSettingsDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
 {
+	static HWND hDisableMemProtectionTooltipWnd = NULL;
 	WORD lw = LOWORD (wParam);
 
 	switch (msg)
@@ -11652,9 +11653,24 @@ static BOOL CALLBACK PerformanceSettingsDlgProc (HWND hwndDlg, UINT msg, WPARAM
 
 			ToHyperlink (hwndDlg, IDC_MORE_INFO_ON_HW_ACCELERATION);
 			ToHyperlink (hwndDlg, IDC_MORE_INFO_ON_THREAD_BASED_PARALLELIZATION);
+
+			hDisableMemProtectionTooltipWnd = CreateToolTip (IDC_DISABLE_MEMORY_PROTECTION, hwndDlg, "DISABLE_MEMORY_PROTECTION_WARNING");
+			// make IDC_DISABLE_MEMORY_PROTECTION control fit the text so that the tooltip is shown only when mouse is over the text
+			AccommodateCheckBoxTextWidth(hwndDlg, IDC_DISABLE_MEMORY_PROTECTION);
+			// make the help button adjacent to the checkbox
+			MakeControlsContiguous(hwndDlg, IDC_DISABLE_MEMORY_PROTECTION, IDC_DISABLE_MEMORY_PROTECTION_HELP);
 		}
 		return 0;
 
+	// handle message to destroy hDisableMemProtectionTooltipWnd when the dialog is closed
+	case WM_DESTROY:
+		if (hDisableMemProtectionTooltipWnd)
+		{
+			DestroyWindow (hDisableMemProtectionTooltipWnd);
+			hDisableMemProtectionTooltipWnd = NULL;
+		}
+		break;
+
 	case WM_COMMAND:
 
 		switch (lw)
@@ -11852,10 +11868,18 @@ static BOOL CALLBACK PerformanceSettingsDlgProc (HWND hwndDlg, UINT msg, WPARAM
 				BOOL originalDisableMemoryProtection = !ReadMemoryProtectionConfig();
 				if (disableMemoryProtection != originalDisableMemoryProtection)
 				{
+					if (disableMemoryProtection)
+					{
+						Warning ("DISABLE_MEMORY_PROTECTION_WARNING", hwndDlg);
+					}
+
 					Warning ("SETTING_REQUIRES_REBOOT", hwndDlg);
 				}
 			}
 			return 1;
+		case IDC_DISABLE_MEMORY_PROTECTION_HELP:
+			Applink ("memoryprotection");
+			return 1;
 		case IDC_BENCHMARK:
 			Benchmark (hwndDlg);
 			return 1;

src/Mount/Mount.rc

@@ -345,8 +345,9 @@ BEGIN
                     "Button",BS_AUTOCHECKBOX | WS_TABSTOP,18,237,335,10
     CONTROL         "Activate encryption of keys and passwords stored in RAM",IDC_ENABLE_RAM_ENCRYPTION,
                     "Button",BS_AUTOCHECKBOX | WS_TABSTOP,18,250,337,10
-    CONTROL         "Disable memory protection in VeraCrypt",IDC_DISABLE_MEMORY_PROTECTION,
+    CONTROL         "Disable memory protection for Accessibility tools compatibility",IDC_DISABLE_MEMORY_PROTECTION,
                     "Button",BS_AUTOCHECKBOX | WS_TABSTOP,18,263,339,10
+    PUSHBUTTON      "?",IDC_DISABLE_MEMORY_PROTECTION_HELP,364,259,7,14
     PUSHBUTTON      "&Benchmark",IDC_BENCHMARK,7,279,59,14
     DEFPUSHBUTTON   "OK",IDOK,257,279,50,14
     PUSHBUTTON      "Cancel",IDCANCEL,314,279,50,14

src/Mount/Resource.h

@@ -198,8 +198,8 @@
 #define IDC_FORCE_NEXT_BOOT_VERACRYPT   1176
 #define IDC_FORCE_VERACRYPT_BOOT_ENTRY  1177
 #define IDC_FORCE_VERACRYPT_FIRST_BOOT_ENTRY 1178
-#define IDC_ENABLE_EMV_SUPPORT			1179
-#define IDT_EMV_OPTIONS					1180
+#define IDC_ENABLE_EMV_SUPPORT          1179
+#define IDT_EMV_OPTIONS                 1180
 #define IDM_HELP                        40001
 #define IDM_ABOUT                       40002
 #define IDM_UNMOUNT_VOLUME              40003
@@ -277,7 +277,7 @@
 #define _APS_NO_MFC                     1
 #define _APS_NEXT_RESOURCE_VALUE        120
 #define _APS_NEXT_COMMAND_VALUE         40070
-#define _APS_NEXT_CONTROL_VALUE         1179
+#define _APS_NEXT_CONTROL_VALUE         1181
 #define _APS_NEXT_SYMED_VALUE           101
 #endif
 #endif

src/Setup/Setup.rc

@@ -151,8 +151,9 @@ BEGIN
     CONTROL         "Add VeraCrypt icon to &desktop",IDC_DESKTOP_ICON,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,92,168,11
     CONTROL         "Associate the .hc file &extension with VeraCrypt",IDC_FILE_TYPE,
                     "Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,104,232,11
-    CONTROL         "Disable memory protection in VeraCrypt",IDC_DISABLE_MEMORY_PROTECTION,
-                    "Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,115,218,10
+    CONTROL         "Disable memory protection for Accessibility tools compatibility",IDC_DISABLE_MEMORY_PROTECTION,
+                    "Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,115,315,10
+    PUSHBUTTON      "?",IDC_DISABLE_MEMORY_PROTECTION_HELP,337,111,7,14
     CONTROL         "Create System &Restore point",IDC_SYSTEM_RESTORE,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,16,125,194,11
     LTEXT           "Please select or type the location where you want to install the VeraCrypt program files. If the specified folder does not exist, it will be automatically created.",IDT_INSTALL_DESTINATION,11,14,319,25
 END

src/Setup/Wizard.c

@@ -212,6 +212,7 @@ static int GetDonVal (int minVal, int maxVal)
 BOOL CALLBACK PageDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
 	static char PageDebugId[128];
+	static HWND hDisableMemProtectionTooltipWnd = NULL;
 	WORD lw = LOWORD (wParam);
 	WORD hw = HIWORD (wParam);
 
@@ -439,9 +440,16 @@ BOOL CALLBACK PageDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 					EnableWindow (GetDlgItem (hwndDlg, IDC_SYSTEM_RESTORE), FALSE);
 				}
 
+				hDisableMemProtectionTooltipWnd = CreateToolTip (IDC_DISABLE_MEMORY_PROTECTION, hwndDlg, "DISABLE_MEMORY_PROTECTION_WARNING");
+				// make IDC_DISABLE_MEMORY_PROTECTION control fit the text so that the tooltip is shown only when mouse is over the text
+				AccommodateCheckBoxTextWidth(hwndDlg, IDC_DISABLE_MEMORY_PROTECTION);
+				// make the help button adjacent to the checkbox
+				MakeControlsContiguous(hwndDlg, IDC_DISABLE_MEMORY_PROTECTION, IDC_DISABLE_MEMORY_PROTECTION_HELP);
+
 				SetCheckBox (hwndDlg, IDC_ALL_USERS, bForAllUsers);
 				SetCheckBox (hwndDlg, IDC_FILE_TYPE, bRegisterFileExt);
 				SetCheckBox (hwndDlg, IDC_PROG_GROUP, bAddToStartMenu);
+				SetCheckBox (hwndDlg, IDC_DISABLE_MEMORY_PROTECTION, bDisableMemoryProtection);
 				SetCheckBox (hwndDlg, IDC_DESKTOP_ICON, bDesktopIcon);
 
 				SetWindowTextW (GetDlgItem (GetParent (hwndDlg), IDC_NEXT), GetString (bUpgrade ? "UPGRADE" : "INSTALL"));
@@ -687,6 +695,14 @@ BOOL CALLBACK PageDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 
 			case IDC_DISABLE_MEMORY_PROTECTION:
 				bDisableMemoryProtection = IsButtonChecked (GetDlgItem (hCurPage, IDC_DISABLE_MEMORY_PROTECTION));
+				if (bDisableMemoryProtection)
+				{
+					Warning ("DISABLE_MEMORY_PROTECTION_WARNING", hwndDlg);
+				}
+				return 1;
+
+			case IDC_DISABLE_MEMORY_PROTECTION_HELP:
+				Applink("memoryprotection")
 				return 1;
 
 			case IDC_FILE_TYPE:
@@ -764,6 +780,16 @@ BOOL CALLBACK PageDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 		}
 		return 0;
 
+	case WM_DESTROY:
+	
+		if (hDisableMemProtectionTooltipWnd != NULL)
+		{
+			DestroyWindow (hDisableMemProtectionTooltipWnd);
+			hDisableMemProtectionTooltipWnd = NULL;
+		}
+
+		break;
+
 	}
 
 	return 0;