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Ensure policy check before creating Zone.Identifier for downloaded files on Windows

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Eugene 2025-03-01 19:03:51 +03:00 • committed by John Preston
parent 9e12e18f90
commit e99cb9bfb8
1 changed files with 27 additions and 0 deletions
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27
Telegram/SourceFiles/platform/win/file_utilities_win.cpp
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@ -117,6 +117,28 @@ HBITMAP IconToBitmap(LPWSTR icon, int iconindex) {
return (HBITMAP)CopyImage(result, IMAGE_BITMAP, 0, 0, LR_DEFAULTSIZE | LR_CREATEDIBSECTION); return (HBITMAP)CopyImage(result, IMAGE_BITMAP, 0, 0, LR_DEFAULTSIZE | LR_CREATEDIBSECTION);
} }
bool ShouldSaveZoneInformation() {
// Check if the "Do not preserve zone information in file attachments" policy is enabled.
const auto keyName = L"Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Attachments";
const auto valueName = L"SaveZoneInformation";
auto key = HKEY();
auto result = RegOpenKeyEx(HKEY_CURRENT_USER, keyName, 0, KEY_READ, &key);
if (result != ERROR_SUCCESS) {
// If the registry key cannot be opened, assume the default behavior:
// Windows preserves zone information for downloaded files.
return true;
}
DWORD value = 0, type = 0, size = sizeof(value);
result = RegQueryValueEx(key, valueName, 0, &type, (LPBYTE)&value, &size);
RegCloseKey(key);
if (result != ERROR_SUCCESS || type != REG_DWORD) {
return true;
}
return (value != 1);
}
} // namespace } // namespace
void UnsafeOpenEmailLink(const QString &email) { void UnsafeOpenEmailLink(const QString &email) {
@ -277,6 +299,11 @@ void UnsafeLaunch(const QString &filepath) {
} }
void PostprocessDownloaded(const QString &filepath) { void PostprocessDownloaded(const QString &filepath) {
// Mark file saved to the NTFS file system as originating from the Internet security zone
// unless this feature is disabled by Group Policy.
if (!ShouldSaveZoneInformation()) {
return;
}
auto wstringZoneFile = QDir::toNativeSeparators(filepath).toStdWString() + L":Zone.Identifier"; auto wstringZoneFile = QDir::toNativeSeparators(filepath).toStdWString() + L":Zone.Identifier";
auto f = CreateFile(wstringZoneFile.c_str(), GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); auto f = CreateFile(wstringZoneFile.c_str(), GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (f == INVALID_HANDLE_VALUE) { // :( if (f == INVALID_HANDLE_VALUE) { // :(