Method OnCopyData

cppcryptfs/ui/CryptPropertySheet.cpp:267–353

}

BOOL CCryptPropertySheet::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
	// TODO: Add your message handler code here and/or call default

	if (pCopyDataStruct && 
		pCopyDataStruct->dwData == CPPCRYPTFS_COPYDATA_PIPE &&
		pCopyDataStruct->cbData == sizeof(HANDLE)) {

		auto hPipe = *reinterpret_cast<HANDLE*>(pCopyDataStruct->lpData);

		DWORD client_process_id = 0;

		if (!GetNamedPipeClientProcessId(hPipe, &client_process_id)) {
			return FALSE;
		}

		bool denyOtherSessions = false;
		CryptSettings::getInstance().GetSettingCurrent(DENY_OTHER_SESSIONS, denyOtherSessions);

		bool denyServices = false;
		CryptSettings::getInstance().GetSettingCurrent(DENY_SERVICES, denyServices);

		if (denyOtherSessions || denyServices) {

			DWORD theirSessionId;
			if (!ProcessIdToSessionId(client_process_id, &theirSessionId)) {
				CloseHandle(hPipe);
				return FALSE;
			}

			if (theirSessionId == 0 && denyServices) {			
				CloseHandle(hPipe);
				return FALSE;
			}

			if (denyOtherSessions && theirSessionId != 0) {
				static DWORD mySessionId;
				static once_flag once;
				static bool got_my_sessionid = false;
				call_once(once, [&]() {
					if (ProcessIdToSessionId(GetCurrentProcessId(), &mySessionId)) {
						got_my_sessionid = true;
					}
					});

				if (!got_my_sessionid) {
					CloseHandle(hPipe);
					return FALSE;
				}


				if (theirSessionId != mySessionId) {
					CloseHandle(hPipe);
					return FALSE;
				}
			}
		}