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Add Option to Enable/Disable Screen Capture (#1418)

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Veracrypt currently appears in screenshots and screen captures,
which can unintentionally expose sensitive information, such as
the fact that Veracrypt is running or the location of your volumes.

Both Windows and macOS offer mechanisms to exclude specific windows
from being captured. While not foolproof, this is a useful preventative
measure. The method is a no-op for Linux/FreeBSD.

For more details on the wxWidgets API, see:
https://docs.wxwidgets.org/3.2/classwx_top_level_window.html#a337b9cec62b0cbd3b1b1545a83270f64
This commit is contained in:
Deniz Türkoglu 2024-09-17 08:05:21 +10:00 committed by GitHub
parent eb0eec7b39
commit e0a46f6b2b
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
6 changed files with 22 additions and 0 deletions
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4
src/Main/CommandLineInterface.cpp
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@ -29,6 +29,7 @@ namespace VeraCrypt
ArgPim (-1),
ArgSize (0),
ArgVolumeType (VolumeType::Unknown),
ArgAllowScreencapture (false),
ArgDisableFileSizeCheck (false),
ArgUseLegacyPassword (false),
#if defined(TC_LINUX ) || defined (TC_FREEBSD)
@ -41,6 +42,7 @@ namespace VeraCrypt
parser.SetSwitchChars (L"-");
parser.AddSwitch (L"", L"allow-screencapture", _("Allow window to be included in screenshots and screen captures (Windows/MacOS)"));
parser.AddOption (L"", L"auto-mount", _("Auto mount device-hosted/favorite volumes"));
parser.AddSwitch (L"", L"backup-headers", _("Backup volume headers"));
parser.AddSwitch (L"", L"background-task", _("Start Background Task"));
@ -142,6 +144,8 @@ namespace VeraCrypt
ArgMountOptions = Preferences.DefaultMountOptions;
}
ArgAllowScreencapture = parser.Found (L"allow-screencapture");
// Commands
if (parser.Found (L"auto-mount", &str))
{

1
src/Main/CommandLineInterface.h
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@ -84,6 +84,7 @@ namespace VeraCrypt
VolumeInfoList ArgVolumes;
VolumeType::Enum ArgVolumeType;
shared_ptr<SecureBuffer> ArgTokenPin;
bool ArgAllowScreencapture;
bool ArgDisableFileSizeCheck;
bool ArgUseLegacyPassword;
#if defined(TC_LINUX ) || defined (TC_FREEBSD)

7
src/Main/Forms/MainFrame.cpp
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@ -84,6 +84,7 @@ namespace VeraCrypt
InitTaskBarIcon();
InitEvents();
InitMessageFilter();
InitWindowPrivacy();
if (!GetPreferences().SecurityTokenModule.IsEmpty() && !SecurityToken::IsInitialized())
{
@ -470,6 +471,12 @@ namespace VeraCrypt
#endif
}
void MainFrame::InitWindowPrivacy ()
{
Gui->SetContentProtection(!CmdLine->ArgAllowScreencapture);
}
void MainFrame::InitPreferences ()
{
try

1
src/Main/Forms/MainFrame.h
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@ -84,6 +84,7 @@ namespace VeraCrypt
void InitMessageFilter ();
void InitPreferences ();
void InitTaskBarIcon ();
void InitWindowPrivacy();
bool IsFreeSlotSelected () const { return SlotListCtrl->GetSelectedItemCount() == 1 && Gui->GetListCtrlSubItemText (SlotListCtrl, SelectedItemIndex, ColumnPath).empty(); }
bool IsMountedSlotSelected () const { return SlotListCtrl->GetSelectedItemCount() == 1 && !Gui->GetListCtrlSubItemText (SlotListCtrl, SelectedItemIndex, ColumnPath).empty(); }
void LoadFavoriteVolumes ();

8
src/Main/GraphicUserInterface.cpp
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@ -1874,6 +1874,14 @@ namespace VeraCrypt
listCtrl->SetMinSize (wxSize (width, listCtrl->GetMinSize().GetHeight()));
}
void GraphicUserInterface::SetContentProtection (bool enable) const
{
#if defined(TC_WINDOWS) || defined(TC_MACOSX)
GetActiveWindow()->SetContentProtection(enable ? wxCONTENT_PROTECTION_ENABLED : wxCONTENT_PROTECTION_NONE);
#endif
}
void GraphicUserInterface::ShowErrorTopMost (const wxString &message) const
{
ShowMessage (message, wxOK | wxICON_ERROR, true);

1
src/Main/GraphicUserInterface.h
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@ -86,6 +86,7 @@ namespace VeraCrypt
virtual void SetListCtrlColumnWidths (wxListCtrl *listCtrl, list <int> columnWidthPermilles, bool hasVerticalScrollbar = true) const;
virtual void SetListCtrlHeight (wxListCtrl *listCtrl, size_t rowCount) const;
virtual void SetListCtrlWidth (wxListCtrl *listCtrl, size_t charCount, bool hasVerticalScrollbar = true) const;
virtual void SetContentProtection(bool enable) const;
virtual void ShowErrorTopMost (char *langStringId) const { ShowErrorTopMost (LangString[langStringId]); }
virtual void ShowErrorTopMost (const wxString &message) const;
virtual void ShowInfoTopMost (char *langStringId) const { ShowInfoTopMost (LangString[langStringId]); }