MsiHack.cpp@ 83563

Last change on this file since 83563 was 82968, checked in by vboxsync, 5 years ago
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1	/* $Id: MsiHack.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* MsiHack - Exterimental DLL that intercept small ReadFile calls from
4	* MSI, CABINET and WINTEROP, buffering them using memory mapped files.
5	*
6	* @remarks Doesn't save as much as hoped on fast disks.
7	*/
8
9	/*
10	* Copyright (C) 2016-2020 Oracle Corporation
11	*
12	* This file is part of VirtualBox Open Source Edition (OSE), as
13	* available from http://www.virtualbox.org. This file is free software;
14	* you can redistribute it and/or modify it under the terms of the GNU
15	* General Public License (GPL) as published by the Free Software
16	* Foundation, in version 2 as it comes in the "COPYING" file of the
17	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
18	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
19	*/
20
21
22	/*********************************************************************************************************************************
23	* Header Files *
24	*********************************************************************************************************************************/
25	#include <iprt/win/windows.h>
26	#include <iprt/string.h>
27	#include <iprt/asm.h>
28	#include <stdio.h>
29	#include <wchar.h>
30
31
32	/*********************************************************************************************************************************
33	* Defined Constants And Macros *
34	*********************************************************************************************************************************/
35	/** @MSI_HACK_HANDLE_TO_INDEX
36	* Handle to g_papHandles index.
37	*/
38	#if ARCH_BITS == 64
39	# define MSI_HACK_HANDLE_TO_INDEX(hHandle) (((uintptr_t)hHandle & ~UINT64_C(0x80000000)) >> 3)
40	#elif ARCH_BITS == 32
41	# define MSI_HACK_HANDLE_TO_INDEX(hHandle) (((uintptr_t)hHandle & ~UINT32_C(0x80000000)) >> 2)
42	#else
43	# error "Unsupported or missing ARCH_BITS!"
44	#endif
45
46	/** Generic assertion macro. */
47	#define MSIHACK_ASSERT(a_Expr) \
48	do { \
49	if (!!(a_Expr)) { /* likely */ } \
50	else MsiHackErrorF("Assertion failed at line " RT_STR(__LINE__) ": " #a_Expr "\n"); \
51	} while (0)
52
53	/** Assertion macro that returns if expression is false. */
54	#define MSIHACK_ASSERT_RETURN(a_Expr, a_fRc) \
55	do { \
56	if (!!(a_Expr)) { /* likely */ } \
57	else \
58	{ \
59	MsiHackErrorF("Assertion failed at line " RT_STR(__LINE__) ": " #a_Expr "\n"); \
60	return (a_fRc); \
61	} \
62	} while (0)
63
64	/** Assertion macro that executes a statemtn when false. */
65	#define MSIHACK_ASSERT_STMT(a_Expr, a_Stmt) \
66	do { \
67	if (!!(a_Expr)) { /* likely */ } \
68	else \
69	{ \
70	MsiHackErrorF("Assertion failed at line " RT_STR(__LINE__) ": " #a_Expr "\n"); \
71	a_Stmt; \
72	} \
73	} while (0)
74
75	/** Assertion macro that executes a statemtn when false. */
76	#define MSIHACK_ASSERT_MSG(a_Expr, a_Msg) \
77	do { \
78	if (!!(a_Expr)) { /* likely */ } \
79	else \
80	{ \
81	MsiHackErrorF("Assertion failed at line " RT_STR(__LINE__) ": " #a_Expr "\n"); \
82	MsiHackErrorF a_Msg; \
83	} \
84	} while (0)
85
86
87	/*********************************************************************************************************************************
88	* Structures and Typedefs *
89	*********************************************************************************************************************************/
90	/**
91	* Intercepted handle data.
92	*/
93	typedef struct MSIHACKHANDLE
94	{
95	/** The actual handle value. */
96	HANDLE hHandle;
97	/** The buffer. */
98	uint8_t *pbBuffer;
99	/** Valid buffer size. */
100	size_t cbBuffer;
101	/** The allocated buffer size. */
102	size_t cbBufferAlloc;
103	/** The file offset of the buffer. */
104	uint64_t offFileBuffer;
105	/** The file size. */
106	uint64_t cbFile;
107	/** The current file offset. */
108	uint64_t offFile;
109	/** Whether pbBuffer is a memory mapping of hHandle. */
110	bool fMemoryMapped;
111	/** We only try caching a file onece. */
112	bool fDontTryAgain;
113	/** Reference counter. */
114	int32_t volatile cRefs;
115	/** Critical section protecting the handle. */
116	CRITICAL_SECTION CritSect;
117	} MSIHACKHANDLE;
118	/** Pointer to an intercepted handle. */
119	typedef MSIHACKHANDLE *PMSIHACKHANDLE;
120
121
122	/**
123	* Replacement function entry.
124	*/
125	typedef struct MSIHACKREPLACEMENT
126	{
127	/** The function name. */
128	const char *pszFunction;
129	/** The length of the function name. */
130	size_t cchFunction;
131	/** The module name (optional). */
132	const char *pszModule;
133	/** The replacement function or data address. */
134	uintptr_t pfnReplacement;
135	} MSIHACKREPLACEMENT;
136	/** Pointer to a replacement function entry */
137	typedef MSIHACKREPLACEMENT const *PCMSIHACKREPLACEMENT;
138
139
140	/*********************************************************************************************************************************
141	* Global Variables *
142	*********************************************************************************************************************************/
143	/** Critical section protecting the handle table. */
144	static CRITICAL_SECTION g_CritSect;
145	/** Size of the handle table. */
146	static size_t g_cHandles;
147	/** The handle table. */
148	static PMSIHACKHANDLE *g_papHandles;
149
150
151
152	void MsiHackErrorF(const char *pszFormat, ...)
153	{
154	fprintf(stderr, "MsiHack: error: ");
155	va_list va;
156	va_start(va, pszFormat);
157	vfprintf(stderr, pszFormat, va);
158	va_end(va);
159	}
160
161
162	void MsiHackDebugF(const char *pszFormat, ...)
163	{
164	if (1)
165	{
166	fprintf(stderr, "MsiHack: debug: ");
167	va_list va;
168	va_start(va, pszFormat);
169	vfprintf(stderr, pszFormat, va);
170	va_end(va);
171	}
172	}
173
174
175	/**
176	* Destroys a handle.
177	*/
178	DECL_NO_INLINE(static, void) MsiHackHandleDestroy(PMSIHACKHANDLE pHandle)
179	{
180	/* The handle value should always be invalid at this point! */
181	MSIHACK_ASSERT(pHandle->hHandle == INVALID_HANDLE_VALUE);
182
183	if (pHandle->fMemoryMapped)
184	UnmapViewOfFile(pHandle->pbBuffer);
185	else
186	free(pHandle->pbBuffer);
187	pHandle->pbBuffer = NULL;
188
189	DeleteCriticalSection(&pHandle->CritSect);
190	free(pHandle);
191	}
192
193
194	/**
195	* Releases a handle reference.
196	* @param pHandle The handle to release.
197	*/
198	DECLINLINE(void) MsiHackHandleRelease(PMSIHACKHANDLE pHandle)
199	{
200	if (ASMAtomicDecS32(&pHandle->cRefs) != 0)
201	return;
202	MsiHackHandleDestroy(pHandle);
203	}
204
205
206	/**
207	* Get and retain handle.
208	*
209	* @returns Pointer to a reference handle or NULL if not our handle.
210	* @param hHandle The handle.
211	*/
212	DECLINLINE(PMSIHACKHANDLE) MsiHackHandleRetain(HANDLE hHandle)
213	{
214	uintptr_t const idxHandle = MSI_HACK_HANDLE_TO_INDEX(hHandle);
215	EnterCriticalSection(&g_CritSect);
216	if (idxHandle < g_cHandles)
217	{
218	PMSIHACKHANDLE pHandle = g_papHandles[idxHandle];
219	if (pHandle)
220	{
221	ASMAtomicIncS32(&pHandle->cRefs);
222	LeaveCriticalSection(&g_CritSect);
223	return pHandle;
224	}
225	}
226	LeaveCriticalSection(&g_CritSect);
227	return NULL;
228	}
229
230
231	/**
232	* Enters @a pHandle into the handle table under @a hHandle.
233	*
234	* @returns true on succes, false on error.
235	* @param pHandle The handle to enter.
236	* @param hHandle The handle value to enter it under.
237	*/
238	static bool MsiHackHandleEnter(PMSIHACKHANDLE pHandle, HANDLE hHandle)
239	{
240	uintptr_t const idxHandle = MSI_HACK_HANDLE_TO_INDEX(hHandle);
241	EnterCriticalSection(&g_CritSect);
242
243	/*
244	* Make sure there is room in the handle table.
245	*/
246	bool fOkay = idxHandle < g_cHandles;
247	if (fOkay)
248	{ /* typical */ }
249	else if (idxHandle < _1M)
250	{
251	size_t cNew = g_cHandles * 2;
252	while (cNew < idxHandle)
253	cNew *= 2;
254
255	void pvNew = realloc(g_papHandles, cNew sizeof(g_papHandles[0]));
256	if (pvNew)
257	{
258	g_papHandles = (PMSIHACKHANDLE *)pvNew;
259	memset(&g_papHandles[g_cHandles], 0, (cNew - g_cHandles) * sizeof(g_papHandles[0]));
260	g_cHandles = cNew;
261	fOkay = true;
262	}
263	else
264	MsiHackErrorF("Failed to grow handle table from %p to %p entries!\n", g_cHandles, cNew);
265	}
266	else
267	MsiHackErrorF("Handle %p (0x%p) is above the max handle table size limit!\n", hHandle, idxHandle);
268	if (fOkay)
269	{
270	/*
271	* Insert it into the table if the entry is empty.
272	*/
273	if (g_papHandles[idxHandle] == NULL)
274	{
275	g_papHandles[idxHandle] = pHandle;
276	LeaveCriticalSection(&g_CritSect);
277	return true;
278	}
279	MsiHackErrorF("Handle table entry 0x%p (%p) is already busy with %p! Cannot replace with %p.\n",
280	hHandle, idxHandle, g_papHandles[idxHandle], pHandle);
281	}
282
283	LeaveCriticalSection(&g_CritSect);
284	return false;
285	}
286
287
288	/**
289	* Prepares a file for potential caching.
290	*
291	* If successful, the handled is entered into the handle table.
292	*
293	* @param hFile Handle to the file to cache.
294	*/
295	static void MsiHackFilePrepare(HANDLE hFile)
296	{
297	DWORD const dwErrSaved = GetLastError();
298
299	LARGE_INTEGER cbFile;
300	if (GetFileSizeEx(hFile, &cbFile))
301	{
302	PMSIHACKHANDLE pHandle = (PMSIHACKHANDLE)calloc(1, sizeof(*pHandle));
303	if (pHandle)
304	{
305	pHandle->cbFile = cbFile.QuadPart;
306	pHandle->pbBuffer = NULL;
307	pHandle->cbBuffer = 0;
308	pHandle->cbBufferAlloc = 0;
309	pHandle->offFileBuffer = 0;
310	pHandle->fMemoryMapped = true;
311	pHandle->cRefs = 1;
312	InitializeCriticalSection(&pHandle->CritSect);
313	if (MsiHackHandleEnter(pHandle, hFile))
314	{
315	SetLastError(dwErrSaved);
316	return;
317	}
318
319	free(pHandle);
320	}
321	}
322
323	SetLastError(dwErrSaved);
324	}
325
326
327	/**
328	* Worker for MsiHackFileSetupCache
329	*
330	* @returns True if sucessfully cached, False if not.
331	* @param pHandle The file.
332	* @param hFile The current valid handle.
333	*/
334	static bool MsiHackFileSetupCache(PMSIHACKHANDLE pHandle, HANDLE hFile)
335	{
336	DWORD const dwErrSaved = GetLastError();
337	HANDLE hMapping = CreateFileMappingW(hFile, NULL /pSecAttrs/, PAGE_READONLY,
338	0 /cbMaxLow/, 0 /cbMaxHigh/, NULL /pwszName/);
339	if (hMapping != NULL)
340	{
341	pHandle->pbBuffer = (uint8_t )MapViewOfFile(hMapping, FILE_MAP_READ, 0 /offFileHigh/, 0 /offFileLow*/,
342	(SIZE_T)pHandle->cbFile);
343	if (pHandle->pbBuffer)
344	{
345	pHandle->cbBuffer = (size_t)pHandle->cbFile;
346	pHandle->cbBufferAlloc = (size_t)pHandle->cbFile;
347	pHandle->offFileBuffer = 0;
348	pHandle->fMemoryMapped = true;
349	CloseHandle(hMapping);
350
351	SetLastError(dwErrSaved);
352	return true;
353	}
354	CloseHandle(hMapping);
355	}
356	SetLastError(dwErrSaved);
357	pHandle->fDontTryAgain = true;
358	return false;
359	}
360
361
362	/**
363	* This is called to check if the file is cached and try cache it.
364	*
365	* We delay the actually caching till the file is read, so we don't waste time
366	* mapping it into memory when all that is wanted is the file size or something
367	* like that.
368	*
369	* @returns True if cached, False if not.
370	* @param pHandle The file.
371	* @param hFile The current valid handle.
372	*/
373	DECLINLINE(bool) MsiHackFileIsCached(PMSIHACKHANDLE pHandle, HANDLE hFile)
374	{
375	if (pHandle->pbBuffer)
376	return true;
377	if (!pHandle->fDontTryAgain)
378	return MsiHackFileSetupCache(pHandle, hFile);
379	return false;
380	}
381
382
383	/** Kernel32 - CreateFileA */
384	static HANDLE WINAPI MsiHack_Kernel32_CreateFileA(LPCSTR pszFilename, DWORD dwDesiredAccess, DWORD dwShareMode,
385	LPSECURITY_ATTRIBUTES pSecAttrs, DWORD dwCreationDisposition,
386	DWORD dwFlagsAndAttributes, HANDLE hTemplateFile)
387	{
388	/*
389	* If this is read-only access to the file, try cache it.
390	*/
391	if (dwCreationDisposition == OPEN_EXISTING)
392	{
393	if ( dwDesiredAccess == GENERIC_READ
394	\|\| dwDesiredAccess == FILE_GENERIC_READ)
395	{
396	if (dwShareMode & FILE_SHARE_READ)
397	{
398	if ( !pSecAttrs
399	\|\| ( pSecAttrs->nLength == sizeof(*pSecAttrs)
400	&& pSecAttrs->lpSecurityDescriptor == NULL ) )
401	{
402	HANDLE hFile = CreateFileA(pszFilename, dwDesiredAccess, dwShareMode, pSecAttrs,
403	dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
404	if (hFile != INVALID_HANDLE_VALUE && hFile != NULL)
405	{
406	MsiHackDebugF("CreateFileA: %s\n", pszFilename );
407	MsiHackFilePrepare(hFile);
408	}
409	return hFile;
410	}
411	}
412	}
413	}
414
415	/*
416	* Don't intercept it.
417	*/
418	return CreateFileA(pszFilename, dwDesiredAccess, dwShareMode, pSecAttrs,
419	dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
420	}
421
422
423	/** Kernel32 - CreateFileW */
424	static HANDLE WINAPI MsiHack_Kernel32_CreateFileW(LPCWSTR pwszFilename, DWORD dwDesiredAccess, DWORD dwShareMode,
425	LPSECURITY_ATTRIBUTES pSecAttrs, DWORD dwCreationDisposition,
426	DWORD dwFlagsAndAttributes, HANDLE hTemplateFile)
427	{
428	/*
429	* If this is read-only access to the file, try cache it.
430	*/
431	if (dwCreationDisposition == OPEN_EXISTING)
432	{
433	if ( dwDesiredAccess == GENERIC_READ
434	\|\| dwDesiredAccess == FILE_GENERIC_READ)
435	{
436	if (dwShareMode & FILE_SHARE_READ)
437	{
438	if ( !pSecAttrs
439	\|\| ( pSecAttrs->nLength == sizeof(*pSecAttrs)
440	&& pSecAttrs->lpSecurityDescriptor == NULL ) )
441	{
442	HANDLE hFile = CreateFileW(pwszFilename, dwDesiredAccess, dwShareMode, pSecAttrs,
443	dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
444	if (hFile != INVALID_HANDLE_VALUE && hFile != NULL)
445	{
446	MsiHackDebugF("CreateFileW: %ls\n", pwszFilename);
447	MsiHackFilePrepare(hFile);
448	}
449	return hFile;
450	}
451	}
452	}
453	}
454
455	/*
456	* Don't intercept it.
457	*/
458	return CreateFileW(pwszFilename, dwDesiredAccess, dwShareMode, pSecAttrs,
459	dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
460	}
461
462
463	/** Kernel32 - SetFilePointer */
464	static DWORD WINAPI MsiHack_Kernel32_SetFilePointer(HANDLE hFile, LONG cbMove, PLONG pcbMoveHi, DWORD dwMoveMethod)
465	{
466	/*
467	* If intercepted handle, deal with it.
468	*/
469	PMSIHACKHANDLE pHandle = MsiHackHandleRetain(hFile);
470	if (pHandle)
471	{
472	if (MsiHackFileIsCached(pHandle, hFile))
473	{
474	int64_t offMove = pcbMoveHi ? ((int64_t)*pcbMoveHi << 32) \| cbMove : cbMove;
475
476	EnterCriticalSection(&pHandle->CritSect);
477	switch (dwMoveMethod)
478	{
479	case FILE_BEGIN:
480	break;
481	case FILE_CURRENT:
482	offMove += pHandle->offFile;
483	break;
484	case FILE_END:
485	offMove += pHandle->cbFile;
486	break;
487	default:
488	LeaveCriticalSection(&pHandle->CritSect);
489	MsiHackHandleRelease(pHandle);
490
491	MsiHackErrorF("SetFilePointer(%p) - invalid method!\n", hFile);
492	SetLastError(ERROR_INVALID_PARAMETER);
493	return INVALID_SET_FILE_POINTER;
494	}
495
496	if (offMove >= 0)
497	{
498	/* Seeking beyond the end isn't useful, so just clamp it. */
499	if (offMove >= (int64_t)pHandle->cbFile)
500	offMove = (int64_t)pHandle->cbFile;
501	pHandle->offFile = (uint64_t)offMove;
502	}
503	else
504	{
505	LeaveCriticalSection(&pHandle->CritSect);
506	MsiHackHandleRelease(pHandle);
507
508	MsiHackErrorF("SetFilePointer(%p) - negative seek!\n", hFile);
509	SetLastError(ERROR_NEGATIVE_SEEK);
510	return INVALID_SET_FILE_POINTER;
511	}
512
513	LeaveCriticalSection(&pHandle->CritSect);
514	MsiHackHandleRelease(pHandle);
515
516	if (pcbMoveHi)
517	*pcbMoveHi = (uint64_t)offMove >> 32;
518	SetLastError(NO_ERROR);
519	return (uint32_t)offMove;
520	}
521	MsiHackHandleRelease(pHandle);
522	}
523
524	/*
525	* Not one of ours.
526	*/
527	return SetFilePointer(hFile, cbMove, pcbMoveHi, dwMoveMethod);
528	}
529
530
531	/** Kernel32 - SetFilePointerEx */
532	static BOOL WINAPI MsiHack_Kernel32_SetFilePointerEx(HANDLE hFile, LARGE_INTEGER offMove, PLARGE_INTEGER poffNew,
533	DWORD dwMoveMethod)
534	{
535	/*
536	* If intercepted handle, deal with it.
537	*/
538	PMSIHACKHANDLE pHandle = MsiHackHandleRetain(hFile);
539	if (pHandle)
540	{
541	if (MsiHackFileIsCached(pHandle, hFile))
542	{
543	int64_t offMyMove = offMove.QuadPart;
544
545	EnterCriticalSection(&pHandle->CritSect);
546	switch (dwMoveMethod)
547	{
548	case FILE_BEGIN:
549	break;
550	case FILE_CURRENT:
551	offMyMove += pHandle->offFile;
552	break;
553	case FILE_END:
554	offMyMove += pHandle->cbFile;
555	break;
556	default:
557	LeaveCriticalSection(&pHandle->CritSect);
558	MsiHackHandleRelease(pHandle);
559
560	MsiHackErrorF("SetFilePointerEx(%p) - invalid method!\n", hFile);
561	SetLastError(ERROR_INVALID_PARAMETER);
562	return INVALID_SET_FILE_POINTER;
563	}
564	if (offMyMove >= 0)
565	{
566	/* Seeking beyond the end isn't useful, so just clamp it. */
567	if (offMyMove >= (int64_t)pHandle->cbFile)
568	offMyMove = (int64_t)pHandle->cbFile;
569	pHandle->offFile = (uint64_t)offMyMove;
570	}
571	else
572	{
573	LeaveCriticalSection(&pHandle->CritSect);
574	MsiHackHandleRelease(pHandle);
575
576	MsiHackErrorF("SetFilePointerEx(%p) - negative seek!\n", hFile);
577	SetLastError(ERROR_NEGATIVE_SEEK);
578	return INVALID_SET_FILE_POINTER;
579	}
580
581	LeaveCriticalSection(&pHandle->CritSect);
582	MsiHackHandleRelease(pHandle);
583
584	if (poffNew)
585	poffNew->QuadPart = offMyMove;
586	return TRUE;
587	}
588	MsiHackHandleRelease(pHandle);
589	}
590
591	/*
592	* Not one of ours.
593	*/
594	return SetFilePointerEx(hFile, offMove, poffNew, dwMoveMethod);
595	}
596
597
598	/** Kernel32 - ReadFile */
599	static BOOL WINAPI MsiHack_Kernel32_ReadFile(HANDLE hFile, LPVOID pvBuffer, DWORD cbToRead, LPDWORD pcbActuallyRead,
600	LPOVERLAPPED pOverlapped)
601	{
602	/*
603	* If intercepted handle, deal with it.
604	*/
605	PMSIHACKHANDLE pHandle = MsiHackHandleRetain(hFile);
606	if (pHandle)
607	{
608	if (MsiHackFileIsCached(pHandle, hFile))
609	{
610	EnterCriticalSection(&pHandle->CritSect);
611	uint32_t cbActually = pHandle->cbFile - pHandle->offFile;
612	if (cbActually > cbToRead)
613	cbActually = cbToRead;
614
615	memcpy(pvBuffer, &pHandle->pbBuffer[pHandle->offFile], cbActually);
616	pHandle->offFile += cbActually;
617
618	LeaveCriticalSection(&pHandle->CritSect);
619	MsiHackHandleRelease(pHandle);
620
621	MSIHACK_ASSERT(!pOverlapped); MSIHACK_ASSERT(pcbActuallyRead);
622	*pcbActuallyRead = cbActually;
623
624	return TRUE;
625	}
626	MsiHackHandleRelease(pHandle);
627	}
628
629	/*
630	* Not one of ours.
631	*/
632	return ReadFile(hFile, pvBuffer, cbToRead, pcbActuallyRead, pOverlapped);
633	}
634
635
636	/** Kernel32 - ReadFileEx */
637	static BOOL WINAPI MsiHack_Kernel32_ReadFileEx(HANDLE hFile, LPVOID pvBuffer, DWORD cbToRead, LPOVERLAPPED pOverlapped,
638	LPOVERLAPPED_COMPLETION_ROUTINE pfnCompletionRoutine)
639	{
640	/*
641	* If intercepted handle, deal with it.
642	*/
643	PMSIHACKHANDLE pHandle = MsiHackHandleRetain(hFile);
644	if (pHandle)
645	{
646	MsiHackHandleRelease(pHandle);
647
648	MsiHackErrorF("Unexpected ReadFileEx call!\n");
649	SetLastError(ERROR_INVALID_FUNCTION);
650	return FALSE;
651	}
652
653	/*
654	* Not one of ours.
655	*/
656	return ReadFileEx(hFile, pvBuffer, cbToRead, pOverlapped, pfnCompletionRoutine);
657	}
658
659
660	/** Kernel32 - DuplicateHandle */
661	static BOOL WINAPI MsiHack_Kernel32_DuplicateHandle(HANDLE hSrcProc, HANDLE hSrc, HANDLE hDstProc, PHANDLE phNew,
662	DWORD dwDesiredAccess, BOOL fInheritHandle, DWORD dwOptions)
663	{
664	/*
665	* We must catch our handles being duplicated.
666	*/
667	if ( hSrcProc == GetCurrentProcess()
668	&& hDstProc == hSrcProc)
669	{
670	PMSIHACKHANDLE pSrcHandle = MsiHackHandleRetain(hSrcProc);
671	if (pSrcHandle)
672	{
673	if (dwOptions & DUPLICATE_CLOSE_SOURCE)
674	MsiHackErrorF("DUPLICATE_CLOSE_SOURCE is not implemented!\n");
675	BOOL fRet = DuplicateHandle(hSrcProc, hSrc, hDstProc, phNew, dwDesiredAccess, fInheritHandle, dwOptions);
676	if (fRet)
677	{
678	if (MsiHackHandleEnter(pSrcHandle, *phNew))
679	return fRet; /* don't release reference. */
680
681	CloseHandle(*phNew);
682	*phNew = INVALID_HANDLE_VALUE;
683	SetLastError(ERROR_NOT_ENOUGH_MEMORY);
684	fRet = FALSE;
685	}
686	MsiHackHandleRelease(pSrcHandle);
687	return fRet;
688	}
689	}
690
691	/*
692	* Not one of ours.
693	*/
694	return DuplicateHandle(hSrcProc, hSrc, hDstProc, phNew, dwDesiredAccess, fInheritHandle, dwOptions);
695	}
696
697
698	/** Kernel32 - CloseHandle */
699	static BOOL WINAPI MsiHack_Kernel32_CloseHandle(HANDLE hObject)
700	{
701	/*
702	* If intercepted handle, remove it from the table.
703	*/
704	uintptr_t const idxHandle = MSI_HACK_HANDLE_TO_INDEX(hObject);
705	EnterCriticalSection(&g_CritSect);
706	if (idxHandle < g_cHandles)
707	{
708	PMSIHACKHANDLE pHandle = g_papHandles[idxHandle];
709	if (pHandle)
710	{
711	g_papHandles[idxHandle] = NULL;
712	LeaveCriticalSection(&g_CritSect);
713
714	/*
715	* Then close the handle.
716	*/
717	EnterCriticalSection(&pHandle->CritSect);
718	BOOL fRet = CloseHandle(hObject);
719	pHandle->hHandle = INVALID_HANDLE_VALUE;
720	DWORD dwErr = GetLastError();
721	LeaveCriticalSection(&pHandle->CritSect);
722
723	/*
724	* And finally release the reference held by the handle table.
725	*/
726	MsiHackHandleRelease(pHandle);
727	SetLastError(dwErr);
728	return fRet;
729	}
730	}
731
732	/*
733	* Not one of ours.
734	*/
735	LeaveCriticalSection(&g_CritSect);
736	return CloseHandle(hObject);
737	}
738
739
740
741
742	/** Replacement functions. */
743	static const MSIHACKREPLACEMENT g_aReplaceFunctions[] =
744	{
745	{ RT_STR_TUPLE("CreateFileA"), NULL, (uintptr_t)MsiHack_Kernel32_CreateFileA },
746	{ RT_STR_TUPLE("CreateFileW"), NULL, (uintptr_t)MsiHack_Kernel32_CreateFileW },
747	{ RT_STR_TUPLE("ReadFile"), NULL, (uintptr_t)MsiHack_Kernel32_ReadFile },
748	{ RT_STR_TUPLE("ReadFileEx"), NULL, (uintptr_t)MsiHack_Kernel32_ReadFileEx },
749	{ RT_STR_TUPLE("SetFilePointer"), NULL, (uintptr_t)MsiHack_Kernel32_SetFilePointer },
750	{ RT_STR_TUPLE("SetFilePointerEx"), NULL, (uintptr_t)MsiHack_Kernel32_SetFilePointerEx },
751	{ RT_STR_TUPLE("DuplicateHandle"), NULL, (uintptr_t)MsiHack_Kernel32_DuplicateHandle },
752	{ RT_STR_TUPLE("CloseHandle"), NULL, (uintptr_t)MsiHack_Kernel32_CloseHandle },
753	};
754
755
756
757	/**
758	* Patches the import table of the given DLL.
759	*
760	* @returns true on success, false on failure.
761	* @param hmod .
762	*/
763	__declspec(dllexport) /* kBuild workaround */
764	bool MsiHackPatchDll(HMODULE hmod)
765	{
766	uint8_t const * const pbImage = (uint8_t const *)hmod;
767
768	/*
769	* Locate the import descriptors.
770	*/
771	/* MZ header and PE headers. */
772	IMAGE_NT_HEADERS const *pNtHdrs;
773	IMAGE_DOS_HEADER const pMzHdr = (IMAGE_DOS_HEADER const )pbImage;
774	if (pMzHdr->e_magic == IMAGE_DOS_SIGNATURE)
775	pNtHdrs = (IMAGE_NT_HEADERS const *)&pbImage[pMzHdr->e_lfanew];
776	else
777	pNtHdrs = (IMAGE_NT_HEADERS const *)pbImage;
778
779	/* Check PE header. */
780	MSIHACK_ASSERT_RETURN(pNtHdrs->Signature == IMAGE_NT_SIGNATURE, false);
781	MSIHACK_ASSERT_RETURN(pNtHdrs->FileHeader.SizeOfOptionalHeader == sizeof(pNtHdrs->OptionalHeader), false);
782	uint32_t const cbImage = pNtHdrs->OptionalHeader.SizeOfImage;
783
784	/* Locate the import descriptor array. */
785	IMAGE_DATA_DIRECTORY const *pDirEnt;
786	pDirEnt = (IMAGE_DATA_DIRECTORY const *)&pNtHdrs->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
787	if ( pDirEnt->Size > 0
788	&& pDirEnt->VirtualAddress != 0)
789	{
790	const IMAGE_IMPORT_DESCRIPTOR pImpDesc = (const IMAGE_IMPORT_DESCRIPTOR )&pbImage[pDirEnt->VirtualAddress];
791	uint32_t cLeft = pDirEnt->Size / sizeof(*pImpDesc);
792	MEMORY_BASIC_INFORMATION ProtInfo = { NULL, NULL, 0, 0, 0, 0, 0 };
793	uint8_t *pbProtRange = NULL;
794	SIZE_T cbProtRange = 0;
795	DWORD fOldProt = 0;
796	uint32_t const cbPage = 0x1000;
797	BOOL fRc;
798
799	MSIHACK_ASSERT_RETURN(pDirEnt->VirtualAddress < cbImage, false);
800	MSIHACK_ASSERT_RETURN(pDirEnt->Size < cbImage, false);
801	MSIHACK_ASSERT_RETURN(pDirEnt->VirtualAddress + pDirEnt->Size <= cbImage, false);
802
803	/*
804	* Walk the import descriptor array.
805	* Note! This only works if there's a backup thunk array, otherwise we cannot get at the name.
806	*/
807	while ( cLeft-- > 0
808	&& pImpDesc->Name > 0
809	&& pImpDesc->FirstThunk > 0)
810	{
811	uint32_t iThunk;
812	const char * const pszImport = (const char *)&pbImage[pImpDesc->Name];
813	PIMAGE_THUNK_DATA paThunks = (PIMAGE_THUNK_DATA)&pbImage[pImpDesc->FirstThunk];
814	PIMAGE_THUNK_DATA paOrgThunks = (PIMAGE_THUNK_DATA)&pbImage[pImpDesc->OriginalFirstThunk];
815	MSIHACK_ASSERT_RETURN(pImpDesc->Name < cbImage, false);
816	MSIHACK_ASSERT_RETURN(pImpDesc->FirstThunk < cbImage, false);
817	MSIHACK_ASSERT_RETURN(pImpDesc->OriginalFirstThunk < cbImage, false);
818	MSIHACK_ASSERT_RETURN(pImpDesc->OriginalFirstThunk != pImpDesc->FirstThunk, false);
819	MSIHACK_ASSERT_RETURN(pImpDesc->OriginalFirstThunk, false);
820
821	/* Iterate the thunks. */
822	for (iThunk = 0; paOrgThunks[iThunk].u1.Ordinal != 0; iThunk++)
823	{
824	uintptr_t const off = paOrgThunks[iThunk].u1.Function;
825	MSIHACK_ASSERT_RETURN(off < cbImage, false);
826	if (!IMAGE_SNAP_BY_ORDINAL(off))
827	{
828	IMAGE_IMPORT_BY_NAME const pName = (IMAGE_IMPORT_BY_NAME const )&pbImage[off];
829	size_t const cchSymbol = strlen((const char *)&pName->Name[0]);
830	uint32_t i = RT_ELEMENTS(g_aReplaceFunctions);
831	while (i-- > 0)
832	if ( g_aReplaceFunctions[i].cchFunction == cchSymbol
833	&& memcmp(g_aReplaceFunctions[i].pszFunction, pName->Name, cchSymbol) == 0)
834	{
835	if ( !g_aReplaceFunctions[i].pszModule
836	\|\| stricmp(g_aReplaceFunctions[i].pszModule, pszImport) == 0)
837	{
838	MsiHackDebugF("Replacing %s!%s\n", pszImport, pName->Name);
839
840	/* The .rdata section is normally read-only, so we need to make it writable first. */
841	if ((uintptr_t)&paThunks[iThunk] - (uintptr_t)pbProtRange >= cbPage)
842	{
843	/* Restore previous .rdata page. */
844	if (fOldProt)
845	{
846	fRc = VirtualProtect(pbProtRange, cbProtRange, fOldProt, NULL /pfOldProt/);
847	MSIHACK_ASSERT(fRc);
848	fOldProt = 0;
849	}
850
851	/* Query attributes for the current .rdata page. */
852	pbProtRange = (uint8_t *)((uintptr_t)&paThunks[iThunk] & ~(uintptr_t)(cbPage - 1));
853	cbProtRange = VirtualQuery(pbProtRange, &ProtInfo, sizeof(ProtInfo));
854	MSIHACK_ASSERT(cbProtRange);
855	if (cbProtRange)
856	{
857	switch (ProtInfo.Protect)
858	{
859	case PAGE_READWRITE:
860	case PAGE_WRITECOPY:
861	case PAGE_EXECUTE_READWRITE:
862	case PAGE_EXECUTE_WRITECOPY:
863	/* Already writable, nothing to do. */
864	fRc = TRUE;
865	break;
866
867	default:
868	MSIHACK_ASSERT_MSG(false, ("%#x\n", ProtInfo.Protect));
869	case PAGE_READONLY:
870	cbProtRange = cbPage;
871	fRc = VirtualProtect(pbProtRange, cbProtRange, PAGE_READWRITE, &fOldProt);
872	break;
873
874	case PAGE_EXECUTE:
875	case PAGE_EXECUTE_READ:
876	cbProtRange = cbPage;
877	fRc = VirtualProtect(pbProtRange, cbProtRange, PAGE_EXECUTE_READWRITE, &fOldProt);
878	break;
879	}
880	MSIHACK_ASSERT_STMT(fRc, fOldProt = 0);
881	}
882	}
883
884	paThunks[iThunk].u1.AddressOfData = g_aReplaceFunctions[i].pfnReplacement;
885	break;
886	}
887	}
888	}
889	}
890
891
892	/* Next import descriptor. */
893	pImpDesc++;
894	}
895
896
897	if (fOldProt)
898	{
899	DWORD fIgnore = 0;
900	fRc = VirtualProtect(pbProtRange, cbProtRange, fOldProt, &fIgnore);
901	MSIHACK_ASSERT_MSG(fRc, ("%u\n", GetLastError())); NOREF(fRc);
902	}
903	return true;
904	}
905	MsiHackErrorF("No imports in target DLL!\n");
906	return false;
907	}
908
909
910	/**
911	* The Dll main entry point.
912	*/
913	BOOL __stdcall DllMain(HANDLE hModule, DWORD dwReason, PVOID pvReserved)
914	{
915	RT_NOREF_PV(pvReserved);
916
917	switch (dwReason)
918	{
919	case DLL_PROCESS_ATTACH:
920	{
921	/*
922	* Make sure we cannot be unloaded. This saves us the bother of ever
923	* having to unpatch MSI.DLL
924	*/
925	WCHAR wszName[MAX_PATH*2];
926	SetLastError(NO_ERROR);
927	if ( GetModuleFileNameW((HMODULE)hModule, wszName, RT_ELEMENTS(wszName)) > 0
928	&& GetLastError() == NO_ERROR)
929	{
930	int cExtraLoads = 32;
931	while (cExtraLoads-- > 0)
932	LoadLibraryW(wszName);
933	}
934
935	/*
936	* Initialize globals.
937	*/
938	InitializeCriticalSection(&g_CritSect);
939	g_papHandles = (PMSIHACKHANDLE *)calloc(sizeof(g_papHandles[0]), 8192);
940	if (g_papHandles)
941	g_cHandles = 8192;
942	else
943	{
944	MsiHackErrorF("Failed to allocate handle table!\n");
945	return FALSE;
946	}
947
948	/*
949	* Find MSI and patch it.
950	*/
951	static struct
952	{
953	const wchar_t pwszName; /< Dll name. /
954	bool fSystem; /*< Set if system, clear if wix. /
955	} s_aDlls[] =
956	{
957	{ L"MSI.DLL", true },
958	{ L"CABINET.DLL", true },
959	{ L"WINTEROP.DLL", false },
960	};
961
962	for (unsigned i = 0; i < RT_ELEMENTS(s_aDlls); i++)
963	{
964	HMODULE hmodTarget = GetModuleHandleW(s_aDlls[i].pwszName);
965	if (!hmodTarget)
966	{
967	UINT cwc;
968	if (s_aDlls[i].fSystem)
969	cwc = GetSystemDirectoryW(wszName, RT_ELEMENTS(wszName) - 16);
970	else
971	{
972	cwc = GetModuleFileNameW(GetModuleHandleW(NULL), wszName, RT_ELEMENTS(wszName) - 16);
973	while (cwc > 0 && (wszName[cwc - 1] != '\\' && wszName[cwc - 1] != '/'))
974	wszName[--cwc] = '\0';
975	}
976	wszName[cwc++] = '\\';
977	wcscpy(&wszName[cwc], s_aDlls[i].pwszName);
978	hmodTarget = LoadLibraryW(wszName);
979	if (!hmodTarget)
980	{
981	MsiHackErrorF("%ls could not be found nor loaded (%ls): %u\n", &wszName[cwc], wszName, GetLastError());
982	return FALSE;
983	}
984	}
985
986	if (MsiHackPatchDll(hmodTarget))
987	MsiHackDebugF("MsiHackPatchDll returned successfully for %ls.\n", s_aDlls[i].pwszName);
988	else
989	MsiHackErrorF("MsiHackPatchDll failed for %ls!\n", s_aDlls[i].pwszName);
990	}
991	break;
992	}
993
994	case DLL_PROCESS_DETACH:
995	case DLL_THREAD_ATTACH:
996	case DLL_THREAD_DETACH:
997	default:
998	/* ignore */
999	break;
1000	}
1001	return TRUE;
1002	}
1003

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source: vbox/trunk/src/VBox/Installer/win/MsiHack/MsiHack.cpp@ 83563

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