From b6c290e4fd77c5d4ae1f5fb68e69006d49e1ad52 Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@idrix.fr>
Date: Tue, 21 Jan 2020 00:53:32 +0100
Subject: Windows: Fix failure of Screen Readers (Accessibility support) to
 reader UI by disabling newly introduced memory protection by default and
 adding a CLI switch (/protectMemory) to enable it when needed. This fixes
 issue https://github.com/veracrypt/VeraCrypt/issues/536

---
 src/ExpandVolume/WinMain.cpp | 69 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

(limited to 'src/ExpandVolume/WinMain.cpp')

diff --git a/src/ExpandVolume/WinMain.cpp b/src/ExpandVolume/WinMain.cpp
index ffeabe01..10c1af40 100644
--- a/src/ExpandVolume/WinMain.cpp
+++ b/src/ExpandVolume/WinMain.cpp
@@ -866,6 +866,67 @@ static BOOL SelectPartition (HWND hwndDlg)
 	return FALSE;
 }
 
+void ExtractCommandLine (HWND hwndDlg, wchar_t *lpszCommandLine)
+{
+	wchar_t **lpszCommandLineArgs = NULL;	/* Array of command line arguments */
+	int nNoCommandLineArgs;	/* The number of arguments in the array */
+
+	/* Extract command line arguments */
+	nNoCommandLineArgs = Win32CommandLine (&lpszCommandLineArgs);
+	if (nNoCommandLineArgs > 0)
+	{
+		int i;
+
+		for (i = 0; i < nNoCommandLineArgs; i++)
+		{
+			enum
+			{
+				OptionEnableMemoryProtection,
+			};
+
+			argument args[]=
+			{
+				{ OptionEnableMemoryProtection,	L"/protectMemory",	NULL, FALSE },
+			};
+
+			argumentspec as;
+
+			int x;
+
+			if (lpszCommandLineArgs[i] == NULL)
+				continue;
+
+			as.args = args;
+			as.arg_cnt = sizeof(args)/ sizeof(args[0]);
+
+			x = GetArgumentID (&as, lpszCommandLineArgs[i]);
+
+			switch (x)
+			{
+
+			case OptionEnableMemoryProtection:
+				EnableMemoryProtection = TRUE;
+				break;
+
+			default:
+				DialogBoxParamW (hInst, MAKEINTRESOURCEW (IDD_COMMANDHELP_DLG), hwndDlg, (DLGPROC)
+						CommandHelpDlgProc, (LPARAM) &as);
+
+				exit(0);
+			}
+		}
+	}
+
+	/* Free up the command line arguments */
+	while (--nNoCommandLineArgs >= 0)
+	{
+		free (lpszCommandLineArgs[nNoCommandLineArgs]);
+	}
+
+	if (lpszCommandLineArgs)
+		free (lpszCommandLineArgs);
+}
+
 
 /* Except in response to the WM_INITDIALOG and WM_ENDSESSION messages, the dialog box procedure
    should return nonzero if it processes a message, and zero if it does not. */
@@ -890,6 +951,8 @@ BOOL CALLBACK MainDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 			bUseSecureDesktop = FALSE;
 			bUseLegacyMaxPasswordLength = FALSE;
 
+			VeraCryptExpander::ExtractCommandLine (hwndDlg, (wchar_t *) lParam);
+
 			if (UsePreferences)
 			{
 				// General preferences
@@ -900,6 +963,12 @@ BOOL CALLBACK MainDialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 				RestoreDefaultKeyFilesParam ();
 			}
 
+			if (EnableMemoryProtection)
+			{
+				/* Protect this process memory from being accessed by non-admin users */
+				EnableProcessProtection ();
+			}
+
 			InitMainDialog (hwndDlg);
 
 			// Quit
-- 
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