maincom.cpp

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/*
 Copyright (c) 2007-2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.6 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include <atlcomcli.h>
#include <atlconv.h>
#include <windows.h>
#include "BaseCom.h"
#include "BootEncryption.h"
#include "Dlgcode.h"
#include "MainCom.h"
#include "MainCom_h.h"
#include "MainCom_i.c"
#include "Mount.h"
#include "Password.h"

using namespace TrueCrypt;

static volatile LONG ObjectCount = 0;

class TrueCryptMainCom : public ITrueCryptMainCom
{

public:
	TrueCryptMainCom (DWORD messageThreadId) : RefCount (0), MessageThreadId (messageThreadId)
	{
		InterlockedIncrement (&ObjectCount);
	}

	~TrueCryptMainCom ()
	{
		if (InterlockedDecrement (&ObjectCount) == 0)
			PostThreadMessage (MessageThreadId, WM_APP, 0, 0);
	}

	virtual ULONG STDMETHODCALLTYPE AddRef ()
	{
		return InterlockedIncrement (&RefCount);
	}

	virtual ULONG STDMETHODCALLTYPE Release ()
	{
		if (!InterlockedDecrement (&RefCount))
		{
			delete this;
			return 0;
		}

		return RefCount;
	}

	virtual HRESULT STDMETHODCALLTYPE QueryInterface (REFIID riid, void **ppvObject)
	{
		if (riid == IID_IUnknown || riid == IID_ITrueCryptMainCom)
			*ppvObject = this;
		else
		{
			*ppvObject = NULL;
			return E_NOINTERFACE;
		}

		AddRef ();
		return S_OK;
	}
	
	virtual int STDMETHODCALLTYPE BackupVolumeHeader (LONG_PTR hwndDlg, BOOL bRequireConfirmation, BSTR lpszVolume)
	{
		USES_CONVERSION;
		MainDlg = (HWND) hwndDlg;
		return ::BackupVolumeHeader ((HWND) hwndDlg, bRequireConfirmation, CW2A (lpszVolume));
	}

	virtual int STDMETHODCALLTYPE RestoreVolumeHeader (LONG_PTR hwndDlg, BSTR lpszVolume)
	{
		USES_CONVERSION;
		MainDlg = (HWND) hwndDlg;
		return ::RestoreVolumeHeader ((HWND) hwndDlg, CW2A (lpszVolume));
	}

	virtual DWORD STDMETHODCALLTYPE CallDriver (DWORD ioctl, BSTR input, BSTR *output)
	{
		return BaseCom::CallDriver (ioctl, input, output);
	}

	virtual int STDMETHODCALLTYPE ChangePassword (BSTR volumePath, Password *oldPassword, Password *newPassword, int pkcs5, LONG_PTR hWnd)
	{
		USES_CONVERSION;
		MainDlg = (HWND) hWnd;
		return ::ChangePwd (CW2A (volumePath), oldPassword, newPassword, pkcs5, (HWND) hWnd);
	}
	
	virtual BOOL STDMETHODCALLTYPE IsPagingFileActive (BOOL checkNonWindowsPartitionsOnly)
	{
		return BaseCom::IsPagingFileActive (checkNonWindowsPartitionsOnly);
	}

	virtual DWORD STDMETHODCALLTYPE ReadWriteFile (BOOL write, BOOL device, BSTR filePath, BSTR *bufferBstr, unsigned __int64 offset, unsigned __int32 size, DWORD *sizeDone)
	{
		return BaseCom::ReadWriteFile (write, device, filePath, bufferBstr, offset, size, sizeDone);
	}

	virtual DWORD STDMETHODCALLTYPE RegisterFilterDriver (BOOL registerDriver, BOOL volumeClass)
	{
		return BaseCom::RegisterFilterDriver (registerDriver, volumeClass);
	}

	virtual DWORD STDMETHODCALLTYPE SetDriverServiceStartType (DWORD startType)
	{
		return BaseCom::SetDriverServiceStartType (startType);
	}

	virtual DWORD STDMETHODCALLTYPE WriteLocalMachineRegistryDwordValue (BSTR keyPath, BSTR valueName, DWORD value)
	{
		return BaseCom::WriteLocalMachineRegistryDwordValue (keyPath, valueName, value);
	}

protected:
	DWORD MessageThreadId;
	LONG RefCount;
};


extern "C" BOOL ComServerMain ()
{
	SetProcessShutdownParameters (0x100, 0);

	TrueCryptFactory<TrueCryptMainCom> factory (GetCurrentThreadId ());
	DWORD cookie;

	if (IsUacSupported ())
		UacElevated = TRUE;

	if (CoRegisterClassObject (CLSID_TrueCryptMainCom, (LPUNKNOWN) &factory,
		CLSCTX_LOCAL_SERVER, REGCLS_SINGLEUSE, &cookie) != S_OK)
		return FALSE;

	MSG msg;
	while (int r = GetMessage (&msg, NULL, 0, 0))
	{
		if (r == -1)
			return FALSE;

		TranslateMessage (&msg);
		DispatchMessage (&msg);

		if (msg.message == WM_APP
			&& ObjectCount < 1
			&& !factory.IsServerLocked ())
			break;
	}
	CoRevokeClassObject (cookie);

	return TRUE;
}


static BOOL ComGetInstance (HWND hWnd, ITrueCryptMainCom **tcServer)
{
	return ComGetInstanceBase (hWnd, CLSID_TrueCryptMainCom, IID_ITrueCryptMainCom, (void **) tcServer);
}


ITrueCryptMainCom *GetElevatedInstance (HWND parent)
{
	ITrueCryptMainCom *instance;

	if (!ComGetInstance (parent, &instance))
		throw UserAbort (SRC_POS);

	return instance;
}


extern "C" int UacBackupVolumeHeader (HWND hwndDlg, BOOL bRequireConfirmation, char *lpszVolume)
{
	CComPtr<ITrueCryptMainCom> tc;
	int r;

	CoInitialize (NULL);

	if (ComGetInstance (hwndDlg, &tc))
		r = tc->BackupVolumeHeader ((LONG_PTR) hwndDlg, bRequireConfirmation, CComBSTR (lpszVolume));
	else
		r = -1;

	CoUninitialize ();

	return r;
}


extern "C" int UacRestoreVolumeHeader (HWND hwndDlg, char *lpszVolume)
{
	CComPtr<ITrueCryptMainCom> tc;
	int r;

	CoInitialize (NULL);

	if (ComGetInstance (hwndDlg, &tc))
		r = tc->RestoreVolumeHeader ((LONG_PTR) hwndDlg, CComBSTR (lpszVolume));
	else
		r = -1;

	CoUninitialize ();

	return r;
}


extern "C" int UacChangePwd (char *lpszVolume, Password *oldPassword, Password *newPassword, int pkcs5, HWND hwndDlg)
{
	CComPtr<ITrueCryptMainCom> tc;
	int r;

	if (ComGetInstance (hwndDlg, &tc))
	{
		WaitCursor ();
		r = tc->ChangePassword (CComBSTR (lpszVolume), oldPassword, newPassword, 0, (LONG_PTR) hwndDlg);
		NormalCursor ();
	}
	else
		r = -1;

	return r;
}