initterm.cpp@ 98103

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1	/* $Id: initterm.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* MS COM / XPCOM Abstraction Layer - Initialization and Termination.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	#define LOG_GROUP LOG_GROUP_MAIN
29	#if !defined(VBOX_WITH_XPCOM)
30
31	# if !defined(_WIN32_WINNT) \|\| _WIN32_WINNT < 0x600
32	# undef _WIN32_WINNT
33	# define _WIN32_WINNT 0x600 /* GetModuleHandleExW */
34	# endif
35	# include <iprt/nt/nt-and-windows.h>
36	# include <iprt/win/objbase.h>
37	# include <iprt/win/rpcproxy.h>
38	# include <rpcasync.h>
39
40	#else /* !defined(VBOX_WITH_XPCOM) */
41
42	# include <stdlib.h>
43
44	# include <nsIComponentRegistrar.h>
45	# include <nsIServiceManager.h>
46	# include <nsCOMPtr.h>
47	# include <nsEventQueueUtils.h>
48	# include <nsEmbedString.h>
49
50	# include <nsILocalFile.h>
51	# include <nsIDirectoryService.h>
52	# include <nsDirectoryServiceDefs.h>
53
54	#endif /* !defined(VBOX_WITH_XPCOM) */
55
56	#include "VBox/com/com.h"
57	#include "VBox/com/assert.h"
58	#include "VBox/com/NativeEventQueue.h"
59	#include "VBox/com/AutoLock.h"
60
61	#include "../include/LoggingNew.h"
62
63	#include <iprt/asm.h>
64	#include <iprt/env.h>
65	#include <iprt/ldr.h>
66	#include <iprt/param.h>
67	#include <iprt/path.h>
68	#include <iprt/string.h>
69	#include <iprt/system.h>
70	#include <iprt/thread.h>
71
72	#include <VBox/err.h>
73
74	namespace com
75	{
76
77	#if defined(VBOX_WITH_XPCOM)
78
79	class DirectoryServiceProvider : public nsIDirectoryServiceProvider
80	{
81	public:
82
83	NS_DECL_ISUPPORTS
84
85	DirectoryServiceProvider()
86	: mCompRegLocation(NULL), mXPTIDatLocation(NULL)
87	, mComponentDirLocation(NULL), mCurrProcDirLocation(NULL)
88	{}
89
90	virtual ~DirectoryServiceProvider();
91
92	HRESULT init(const char *aCompRegLocation,
93	const char *aXPTIDatLocation,
94	const char *aComponentDirLocation,
95	const char *aCurrProcDirLocation);
96
97	NS_DECL_NSIDIRECTORYSERVICEPROVIDER
98
99	private:
100	/** @remarks This is not a UTF-8 string. */
101	char *mCompRegLocation;
102	/** @remarks This is not a UTF-8 string. */
103	char *mXPTIDatLocation;
104	/** @remarks This is not a UTF-8 string. */
105	char *mComponentDirLocation;
106	/** @remarks This is not a UTF-8 string. */
107	char *mCurrProcDirLocation;
108	};
109
110	NS_IMPL_ISUPPORTS1(DirectoryServiceProvider, nsIDirectoryServiceProvider)
111
112	DirectoryServiceProvider::~DirectoryServiceProvider()
113	{
114	if (mCompRegLocation)
115	{
116	RTStrFree(mCompRegLocation);
117	mCompRegLocation = NULL;
118	}
119	if (mXPTIDatLocation)
120	{
121	RTStrFree(mXPTIDatLocation);
122	mXPTIDatLocation = NULL;
123	}
124	if (mComponentDirLocation)
125	{
126	RTStrFree(mComponentDirLocation);
127	mComponentDirLocation = NULL;
128	}
129	if (mCurrProcDirLocation)
130	{
131	RTStrFree(mCurrProcDirLocation);
132	mCurrProcDirLocation = NULL;
133	}
134	}
135
136	/**
137	* @param aCompRegLocation Path to compreg.dat, in Utf8.
138	* @param aXPTIDatLocation Path to xpti.data, in Utf8.
139	*/
140	HRESULT
141	DirectoryServiceProvider::init(const char *aCompRegLocation,
142	const char *aXPTIDatLocation,
143	const char *aComponentDirLocation,
144	const char *aCurrProcDirLocation)
145	{
146	AssertReturn(aCompRegLocation, NS_ERROR_INVALID_ARG);
147	AssertReturn(aXPTIDatLocation, NS_ERROR_INVALID_ARG);
148
149	/** @todo r=bird: Gotta check how this encoding stuff plays out on darwin!
150	* We get down to [VBoxNsxp]NS_NewNativeLocalFile and that file isn't
151	* nsLocalFileUnix.cpp on 32-bit darwin. On 64-bit darwin it's a question
152	* of what we're doing in IPRT and such... We should probably add a
153	* RTPathConvertToNative for use here. */
154	int vrc = RTStrUtf8ToCurrentCP(&mCompRegLocation, aCompRegLocation);
155	if (RT_SUCCESS(vrc))
156	vrc = RTStrUtf8ToCurrentCP(&mXPTIDatLocation, aXPTIDatLocation);
157	if (RT_SUCCESS(vrc) && aComponentDirLocation)
158	vrc = RTStrUtf8ToCurrentCP(&mComponentDirLocation, aComponentDirLocation);
159	if (RT_SUCCESS(vrc) && aCurrProcDirLocation)
160	vrc = RTStrUtf8ToCurrentCP(&mCurrProcDirLocation, aCurrProcDirLocation);
161
162	return RT_SUCCESS(vrc) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
163	}
164
165	NS_IMETHODIMP
166	DirectoryServiceProvider::GetFile(const char *aProp,
167	PRBool *aPersistent,
168	nsIFile **aRetval)
169	{
170	nsCOMPtr <nsILocalFile> localFile;
171	nsresult rv = NS_ERROR_FAILURE;
172
173	*aRetval = nsnull;
174	*aPersistent = PR_TRUE;
175
176	const char *fileLocation = NULL;
177
178	if (strcmp(aProp, NS_XPCOM_COMPONENT_REGISTRY_FILE) == 0)
179	fileLocation = mCompRegLocation;
180	else if (strcmp(aProp, NS_XPCOM_XPTI_REGISTRY_FILE) == 0)
181	fileLocation = mXPTIDatLocation;
182	else if (mComponentDirLocation && strcmp(aProp, NS_XPCOM_COMPONENT_DIR) == 0)
183	fileLocation = mComponentDirLocation;
184	else if (mCurrProcDirLocation && strcmp(aProp, NS_XPCOM_CURRENT_PROCESS_DIR) == 0)
185	fileLocation = mCurrProcDirLocation;
186	else
187	return NS_ERROR_FAILURE;
188
189	rv = NS_NewNativeLocalFile(nsEmbedCString(fileLocation),
190	PR_TRUE, getter_AddRefs(localFile));
191	if (NS_FAILED(rv))
192	return rv;
193
194	return localFile->QueryInterface(NS_GET_IID(nsIFile), (void **)aRetval);
195	}
196
197	/**
198	* Global XPCOM initialization flag (we maintain it ourselves since XPCOM
199	* doesn't provide such functionality)
200	*/
201	static bool volatile gIsXPCOMInitialized = false;
202
203	/**
204	* Number of Initialize() calls on the main thread.
205	*/
206	static unsigned int gXPCOMInitCount = 0;
207
208	#else /* !defined(VBOX_WITH_XPCOM) */
209
210	/**
211	* Replacement function for the InvokeStub method for the IRundown stub.
212	*/
213	static HRESULT STDMETHODCALLTYPE
214	Rundown_InvokeStub(IRpcStubBuffer pThis, RPCOLEMESSAGE pMsg, IRpcChannelBuffer *pBuf) RT_NOTHROW_DEF
215	{
216	/*
217	* Our mission here is to prevent remote calls to methods #8 and #9,
218	* as these contain raw pointers to callback functions.
219	*
220	* Note! APIs like I_RpcServerInqTransportType, I_RpcBindingInqLocalClientPID
221	* and RpcServerInqCallAttributesW are not usable in this context without
222	* a rpc binding handle (latter two).
223	*
224	* P.S. In more recent windows versions, the buffer implements a interface
225	* IID_IRpcChannelBufferMarshalingContext (undocumented) which has a
226	* GetIMarshallingContextAttribute() method that will return the client PID
227	* when asking for attribute #0x8000000e.
228	*/
229	uint32_t const iMethod = pMsg->iMethod & 0xffff; /* Uncertain, but there are hints that the upper bits are flags. */
230	HRESULT hrc;
231	if ( ( iMethod != 8
232	&& iMethod != 9)
233	\|\| (pMsg->rpcFlags & RPCFLG_LOCAL_CALL) )
234	hrc = CStdStubBuffer_Invoke(pThis, pMsg, pBuf);
235	else
236	{
237	LogRel(("Rundown_InvokeStub: Rejected call to CRundown::%s: rpcFlags=%#x cbBuffer=%#x dataRepresentation=%d buffer=%p:{%.*Rhxs} reserved1=%p reserved2={%p,%p,%p,%p,%p}\n",
238	pMsg->iMethod == 8 ? "DoCallback" : "DoNonreentrantCallback", pMsg->rpcFlags, pMsg->cbBuffer,
239	pMsg->dataRepresentation, pMsg->Buffer, RT_VALID_PTR(pMsg->Buffer) ? pMsg->cbBuffer : 0, pMsg->Buffer,
240	pMsg->reserved1, pMsg->reserved2[0], pMsg->reserved2[1], pMsg->reserved2[2], pMsg->reserved2[3], pMsg->reserved2[4]));
241	hrc = E_ACCESSDENIED;
242	}
243	return hrc;
244	}
245
246	/**
247	* Replacement function for the InvokeStub method for the IDLLHost stub.
248	*/
249	static HRESULT STDMETHODCALLTYPE
250	DLLHost_InvokeStub(IRpcStubBuffer pThis, RPCOLEMESSAGE pMsg, IRpcChannelBuffer *pBuf) RT_NOTHROW_DEF
251	{
252	/*
253	* Our mission here is to prevent remote calls to this interface as method #3
254	* contain a raw pointer an DllGetClassObject function. There are only that
255	* method in addition to the IUnknown stuff, and it's ASSUMED that it's
256	* process internal only (cross apartment stuff).
257	*/
258	uint32_t const iMethod = pMsg->iMethod & 0xffff; /* Uncertain, but there are hints that the upper bits are flags. */
259	HRESULT hrc;
260	if (pMsg->rpcFlags & RPCFLG_LOCAL_CALL)
261	hrc = CStdStubBuffer_Invoke(pThis, pMsg, pBuf);
262	else
263	{
264	LogRel(("DLLHost_InvokeStub: Rejected call to CDLLHost::%s: rpcFlags=%#x cbBuffer=%#x dataRepresentation=%d buffer=%p:{%.*Rhxs} reserved1=%p reserved2={%p,%p,%p,%p,%p}\n",
265	pMsg->iMethod == 0 ? "QueryInterface" :
266	pMsg->iMethod == 1 ? "AddRef" :
267	pMsg->iMethod == 2 ? "ReleaseRef" :
268	pMsg->iMethod == 3 ? "DllGetClassObject" : "Unknown", pMsg->rpcFlags, pMsg->cbBuffer,
269	pMsg->dataRepresentation, pMsg->Buffer, RT_VALID_PTR(pMsg->Buffer) ? pMsg->cbBuffer : 0, pMsg->Buffer,
270	pMsg->reserved1, pMsg->reserved2[0], pMsg->reserved2[1], pMsg->reserved2[2], pMsg->reserved2[3], pMsg->reserved2[4]));
271	hrc = E_ACCESSDENIED;
272	}
273	return hrc;
274	}
275
276	/**
277	* Replaces the IRundown InvokeStub method with Rundown_InvokeStub so we can
278	* reject remote calls to a couple of misdesigned methods.
279	*
280	* Also replaces the IDLLHost for the same reasons.
281	*/
282	void PatchComBugs(void)
283	{
284	static volatile bool s_fPatched = false;
285	if (s_fPatched)
286	return;
287
288	/*
289	* The combase.dll / ole32.dll is exporting a DllGetClassObject function
290	* that is implemented using NdrDllGetClassObject just like our own
291	* proxy/stub DLL. This means we can get at the stub interface lists,
292	* since what NdrDllGetClassObject has CStdPSFactoryBuffer as layout.
293	*
294	* Note! Tried using CoRegisterPSClsid instead of this mess, but no luck.
295	*/
296	/* Locate the COM DLL, it must be loaded by now: */
297	HMODULE hmod = GetModuleHandleW(L"COMBASE.DLL");
298	if (!hmod)
299	hmod = GetModuleHandleW(L"OLE32.DLL"); /* w7 */
300	AssertReturnVoid(hmod != NULL);
301
302	/* Resolve the class getter: */
303	LPFNGETCLASSOBJECT pfnGetClassObject = (LPFNGETCLASSOBJECT)GetProcAddress(hmod, "DllGetClassObject");
304	AssertReturnVoid(pfnGetClassObject != NULL);
305
306	/* Get the factory instance: */
307	static const CLSID s_PSOlePrx32ClsId = {0x00000320,0x0000,0x0000,{0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
308	CStdPSFactoryBuffer *pFactoryBuffer = NULL;
309	HRESULT hrc = pfnGetClassObject(s_PSOlePrx32ClsId, IID_IPSFactoryBuffer, (void **)&pFactoryBuffer);
310	AssertMsgReturnVoid(SUCCEEDED(hrc), ("hrc=%Rhrc\n", hrc));
311	AssertReturnVoid(pFactoryBuffer != NULL);
312
313	/*
314	* Search thru the file list for the interface we want to patch.
315	*/
316	static const IID s_IID_Rundown = {0x00000134,0x0000,0x0000,{0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
317	static const IID s_IID_DLLHost = {0x00000141,0x0000,0x0000,{0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
318	decltype(CStdStubBuffer_Invoke) *pfnInvoke = (decltype(pfnInvoke))GetProcAddress(hmod, "CStdStubBuffer_Invoke");
319	if (!pfnInvoke)
320	pfnInvoke = (decltype(pfnInvoke))GetProcAddress(GetModuleHandleW(L"RPCRT4.DLL"), "CStdStubBuffer_Invoke");
321
322	unsigned cPatched = 0;
323	unsigned cAlreadyPatched = 0;
324	Assert(pFactoryBuffer->pProxyFileList != NULL);
325	for (ProxyFileInfo const *ppCur = pFactoryBuffer->pProxyFileList; ppCur != NULL; ppCur++)
326	{
327	ProxyFileInfo const pCur = ppCur;
328
329	if (pCur->pStubVtblList)
330	{
331	for (PCInterfaceStubVtblList const ppCurStub = pCur->pStubVtblList; ppCurStub != NULL; ppCurStub++)
332	{
333	PCInterfaceStubVtblList const pCurStub = *ppCurStub;
334	IID const *piid = pCurStub->header.piid;
335	if (piid)
336	{
337	if (IsEqualIID(*piid, s_IID_Rundown))
338	{
339	if (pCurStub->Vtbl.Invoke == pfnInvoke)
340	{
341	DWORD fOld = 0;
342	if (VirtualProtect(&pCurStub->Vtbl.Invoke, sizeof(pCurStub->Vtbl.Invoke), PAGE_READWRITE, &fOld))
343	{
344	pCurStub->Vtbl.Invoke = Rundown_InvokeStub;
345	VirtualProtect(&pCurStub->Vtbl.Invoke, sizeof(pCurStub->Vtbl.Invoke), fOld, &fOld);
346	cPatched++;
347	}
348	else
349	AssertMsgFailed(("%d\n", GetLastError()));
350	}
351	else
352	cAlreadyPatched++;
353	}
354	else if (IsEqualIID(*piid, s_IID_DLLHost))
355	{
356	if (pCurStub->Vtbl.Invoke == pfnInvoke)
357	{
358	DWORD fOld = 0;
359	if (VirtualProtect(&pCurStub->Vtbl.Invoke, sizeof(pCurStub->Vtbl.Invoke), PAGE_READWRITE, &fOld))
360	{
361	pCurStub->Vtbl.Invoke = DLLHost_InvokeStub;
362	VirtualProtect(&pCurStub->Vtbl.Invoke, sizeof(pCurStub->Vtbl.Invoke), fOld, &fOld);
363	cPatched++;
364	}
365	else
366	AssertMsgFailed(("%d\n", GetLastError()));
367	}
368	else
369	cAlreadyPatched++;
370	}
371	}
372	}
373	}
374	}
375
376	/* done */
377	pFactoryBuffer->lpVtbl->Release((IPSFactoryBuffer *)pFactoryBuffer);
378
379	/*
380	* If we patched anything we should try prevent being unloaded.
381	*/
382	if (cPatched > 0)
383	{
384	s_fPatched = true;
385	HMODULE hmodSelf;
386	AssertLogRelMsg(GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS \| GET_MODULE_HANDLE_EX_FLAG_PIN,
387	(LPCWSTR)(uintptr_t)Rundown_InvokeStub, &hmodSelf),
388	("last error: %u; Rundown_InvokeStub=%p\n", GetLastError(), Rundown_InvokeStub));
389	}
390	AssertLogRelMsg(cAlreadyPatched + cPatched >= 2,
391	("COM patching of IRundown/IDLLHost failed! (%d+%d)\n", cAlreadyPatched, cPatched));
392	}
393
394
395	/**
396	* The COM main thread handle. (The first caller of com::Initialize().)
397	*/
398	static RTTHREAD volatile gCOMMainThread = NIL_RTTHREAD;
399
400	/**
401	* Number of Initialize() calls on the main thread.
402	*/
403	static uint32_t gCOMMainInitCount = 0;
404
405	#endif /* !defined(VBOX_WITH_XPCOM) */
406
407
408	/**
409	* Initializes the COM runtime.
410	*
411	* This method must be called on each thread of the client application that
412	* wants to access COM facilities. The initialization must be performed before
413	* calling any other COM method or attempting to instantiate COM objects.
414	*
415	* On platforms using XPCOM, this method uses the following scheme to search for
416	* XPCOM runtime:
417	*
418	* 1. If the VBOX_APP_HOME environment variable is set, the path it specifies
419	* is used to search XPCOM libraries and components. If this method fails to
420	* initialize XPCOM runtime using this path, it will immediately return a
421	* failure and will NOT check for other paths as described below.
422	*
423	* 2. If VBOX_APP_HOME is not set, this methods tries the following paths in the
424	* given order:
425	*
426	* a) Compiled-in application data directory (as returned by
427	* RTPathAppPrivateArch())
428	* b) "/usr/lib/virtualbox" (Linux only)
429	* c) "/opt/VirtualBox" (Linux only)
430	*
431	* The first path for which the initialization succeeds will be used.
432	*
433	* On MS COM platforms, the COM runtime is provided by the system and does not
434	* need to be searched for.
435	*
436	* Once the COM subsystem is no longer necessary on a given thread, Shutdown()
437	* must be called to free resources allocated for it. Note that a thread may
438	* call Initialize() several times but for each of tese calls there must be a
439	* corresponding Shutdown() call.
440	*
441	* @return S_OK on success and a COM result code in case of failure.
442	*/
443	HRESULT Initialize(uint32_t fInitFlags /=VBOX_COM_INIT_F_DEFAULT/)
444	{
445	HRESULT rc = E_FAIL;
446
447	#if !defined(VBOX_WITH_XPCOM)
448
449	# ifdef VBOX_WITH_AUTO_COM_REG_UPDATE
450	/*
451	* First time we're called in a process, we refresh the VBox COM
452	* registrations. Use a global mutex to prevent updating when there are
453	* API users already active, as that could lead to a bit of a mess.
454	*/
455	if ( (fInitFlags & VBOX_COM_INIT_F_AUTO_REG_UPDATE)
456	&& gCOMMainThread == NIL_RTTHREAD)
457	{
458	SetLastError(ERROR_SUCCESS);
459	HANDLE hLeakIt = CreateMutexW(NULL/pSecAttr/, FALSE, L"Global\\VirtualBoxComLazyRegistrationMutant");
460	DWORD dwErr = GetLastError();
461	AssertMsg(dwErr == ERROR_SUCCESS \|\| dwErr == ERROR_ALREADY_EXISTS \|\| dwErr == ERROR_ACCESS_DENIED, ("%u\n", dwErr));
462	if (dwErr == ERROR_SUCCESS)
463	{
464	char szPath[RTPATH_MAX];
465	int vrc = RTPathAppPrivateArch(szPath, sizeof(szPath));
466	if (RT_SUCCESS(vrc))
467	# ifndef VBOX_IN_32_ON_64_MAIN_API
468	vrc = RTPathAppend(szPath, sizeof(szPath),
469	RT_MAKE_U64(((PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA)->NtMinorVersion,
470	((PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA)->NtMajorVersion)
471	>= RT_MAKE_U64(1/Lo/,6/Hi/)
472	? "VBoxProxyStub.dll" : "VBoxProxyStubLegacy.dll");
473	# else
474	vrc = RTPathAppend(szPath, sizeof(szPath), "x86\\VBoxProxyStub-x86.dll");
475	# endif
476	if (RT_SUCCESS(vrc))
477	{
478	RTLDRMOD hMod;
479	vrc = RTLdrLoad(szPath, &hMod);
480	if (RT_SUCCESS(vrc))
481	{
482	union
483	{
484	void *pv;
485	DECLCALLBACKMEMBER(uint32_t, pfnRegUpdate,(void));
486	} u;
487	vrc = RTLdrGetSymbol(hMod, "VbpsUpdateRegistrations", &u.pv);
488	if (RT_SUCCESS(vrc))
489	u.pfnRegUpdate();
490	/* Just keep it loaded. */
491	}
492	}
493	Assert(hLeakIt != NULL); NOREF(hLeakIt);
494	}
495	}
496	# endif
497
498	/*
499	* We initialize COM in GUI thread in STA, to be compliant with QT and
500	* OLE requirments (for example to allow D&D), while other threads
501	* initialized in regular MTA. To allow fast proxyless access from
502	* GUI thread to COM objects, we explicitly provide our COM objects
503	* with free threaded marshaller.
504	* !!!!! Please think twice before touching this code !!!!!
505	*/
506	DWORD flags = fInitFlags & VBOX_COM_INIT_F_GUI
507	? COINIT_APARTMENTTHREADED
508	\| COINIT_SPEED_OVER_MEMORY
509	: COINIT_MULTITHREADED
510	\| COINIT_DISABLE_OLE1DDE
511	\| COINIT_SPEED_OVER_MEMORY;
512
513	rc = CoInitializeEx(NULL, flags);
514
515	/* the overall result must be either S_OK or S_FALSE (S_FALSE means
516	* "already initialized using the same apartment model") */
517	AssertMsg(rc == S_OK \|\| rc == S_FALSE, ("rc=%08X\n", rc));
518
519	#if defined(VBOX_WITH_SDS)
520	// Setup COM Security to enable impersonation
521	HRESULT hrGUICoInitializeSecurity = CoInitializeSecurity(NULL,
522	-1,
523	NULL,
524	NULL,
525	RPC_C_AUTHN_LEVEL_DEFAULT,
526	RPC_C_IMP_LEVEL_IMPERSONATE,
527	NULL,
528	EOAC_NONE,
529	NULL);
530	NOREF(hrGUICoInitializeSecurity);
531	Assert(SUCCEEDED(hrGUICoInitializeSecurity) \|\| hrGUICoInitializeSecurity == RPC_E_TOO_LATE);
532	#endif
533
534	/*
535	* IRundown has unsafe two methods we need to patch to prevent remote access.
536	* Do that before we start using COM and open ourselves to possible attacks.
537	*/
538	if (!(fInitFlags & VBOX_COM_INIT_F_NO_COM_PATCHING))
539	PatchComBugs();
540
541	/* To be flow compatible with the XPCOM case, we return here if this isn't
542	* the main thread or if it isn't its first initialization call.
543	* Note! CoInitializeEx and CoUninitialize does it's own reference
544	* counting, so this exercise is entirely for the EventQueue init. */
545	bool fRc;
546	RTTHREAD hSelf = RTThreadSelf();
547	if (hSelf != NIL_RTTHREAD)
548	ASMAtomicCmpXchgHandle(&gCOMMainThread, hSelf, NIL_RTTHREAD, fRc);
549	else
550	fRc = false;
551
552	if (fInitFlags & VBOX_COM_INIT_F_GUI)
553	Assert(RTThreadIsMain(hSelf));
554
555	if (!fRc)
556	{
557	if ( gCOMMainThread == hSelf
558	&& SUCCEEDED(rc))
559	gCOMMainInitCount++;
560
561	AssertComRC(rc);
562	return rc;
563	}
564	Assert(RTThreadIsMain(hSelf));
565
566	/* this is the first main thread initialization */
567	Assert(gCOMMainInitCount == 0);
568	if (SUCCEEDED(rc))
569	gCOMMainInitCount = 1;
570
571	#else /* !defined(VBOX_WITH_XPCOM) */
572
573	/* Unused here */
574	RT_NOREF(fInitFlags);
575
576	if (ASMAtomicXchgBool(&gIsXPCOMInitialized, true) == true)
577	{
578	/* XPCOM is already initialized on the main thread, no special
579	* initialization is necessary on additional threads. Just increase
580	* the init counter if it's a main thread again (to correctly support
581	* nested calls to Initialize()/Shutdown() for compatibility with
582	* Win32). */
583
584	nsCOMPtr<nsIEventQueue> eventQ;
585	rc = NS_GetMainEventQ(getter_AddRefs(eventQ));
586
587	if (NS_SUCCEEDED(rc))
588	{
589	PRBool isOnMainThread = PR_FALSE;
590	rc = eventQ->IsOnCurrentThread(&isOnMainThread);
591	if (NS_SUCCEEDED(rc) && isOnMainThread)
592	++gXPCOMInitCount;
593	}
594
595	AssertComRC(rc);
596	return rc;
597	}
598	Assert(RTThreadIsMain(RTThreadSelf()));
599
600	/* this is the first initialization */
601	gXPCOMInitCount = 1;
602
603	/* prepare paths for registry files */
604	char szCompReg[RTPATH_MAX];
605	char szXptiDat[RTPATH_MAX];
606
607	int vrc = GetVBoxUserHomeDirectory(szCompReg, sizeof(szCompReg));
608	if (vrc == VERR_ACCESS_DENIED)
609	return NS_ERROR_FILE_ACCESS_DENIED;
610	AssertRCReturn(vrc, NS_ERROR_FAILURE);
611	vrc = RTStrCopy(szXptiDat, sizeof(szXptiDat), szCompReg);
612	AssertRCReturn(vrc, NS_ERROR_FAILURE);
613	# ifdef VBOX_IN_32_ON_64_MAIN_API
614	vrc = RTPathAppend(szCompReg, sizeof(szCompReg), "compreg-x86.dat");
615	AssertRCReturn(vrc, NS_ERROR_FAILURE);
616	vrc = RTPathAppend(szXptiDat, sizeof(szXptiDat), "xpti-x86.dat");
617	AssertRCReturn(vrc, NS_ERROR_FAILURE);
618	# else
619	vrc = RTPathAppend(szCompReg, sizeof(szCompReg), "compreg.dat");
620	AssertRCReturn(vrc, NS_ERROR_FAILURE);
621	vrc = RTPathAppend(szXptiDat, sizeof(szXptiDat), "xpti.dat");
622	AssertRCReturn(vrc, NS_ERROR_FAILURE);
623	# endif
624
625	LogFlowFunc(("component registry : \"%s\"\n", szCompReg));
626	LogFlowFunc(("XPTI data file : \"%s\"\n", szXptiDat));
627
628	static const char *kAppPathsToProbe[] =
629	{
630	NULL, /* 0: will use VBOX_APP_HOME */
631	NULL, /* 1: will try RTPathAppPrivateArch(), correctly installed release builds will never go further */
632	NULL, /* 2: will try parent directory of RTPathAppPrivateArch(), only for testcases in non-hardened builds */
633	/* There used to be hard coded paths, but they only caused trouble
634	* because they often led to mixing of builds or even versions.
635	* If you feel tempted to add anything here, think again. They would
636	* only be used if option 1 would not work, which is a sign of a big
637	* problem, as it returns a fixed location defined at compile time.
638	* It is better to fail than blindly trying to cover the problem. */
639	};
640
641	/* Find out the directory where VirtualBox binaries are located */
642	for (size_t i = 0; i < RT_ELEMENTS(kAppPathsToProbe); ++ i)
643	{
644	char szAppHomeDir[RTPATH_MAX];
645
646	if (i == 0)
647	{
648	/* Use VBOX_APP_HOME if present */
649	vrc = RTEnvGetEx(RTENV_DEFAULT, "VBOX_APP_HOME", szAppHomeDir, sizeof(szAppHomeDir), NULL);
650	if (vrc == VERR_ENV_VAR_NOT_FOUND)
651	continue;
652	AssertRC(vrc);
653	}
654	else if (i == 1)
655	{
656	/* Use RTPathAppPrivateArch() first */
657	vrc = RTPathAppPrivateArch(szAppHomeDir, sizeof(szAppHomeDir));
658	AssertRC(vrc);
659	}
660	else if (i == 2)
661	{
662	# ifdef VBOX_WITH_HARDENING
663	continue;
664	# else /* !VBOX_WITH_HARDENING */
665	/* Use parent of RTPathAppPrivateArch() if ends with "testcase" */
666	vrc = RTPathAppPrivateArch(szAppHomeDir, sizeof(szAppHomeDir));
667	AssertRC(vrc);
668	vrc = RTPathStripTrailingSlash(szAppHomeDir);
669	AssertRC(vrc);
670	char *filename = RTPathFilename(szAppHomeDir);
671	if (!filename \|\| strcmp(filename, "testcase"))
672	continue;
673	RTPathStripFilename(szAppHomeDir);
674	# endif /* !VBOX_WITH_HARDENING */
675	}
676	else
677	{
678	/* Iterate over all other paths */
679	RTStrCopy(szAppHomeDir, sizeof(szAppHomeDir), kAppPathsToProbe[i]);
680	vrc = VINF_SUCCESS;
681	}
682	if (RT_FAILURE(vrc))
683	{
684	rc = NS_ERROR_FAILURE;
685	continue;
686	}
687	char szCompDir[RTPATH_MAX];
688	vrc = RTStrCopy(szCompDir, sizeof(szCompDir), szAppHomeDir);
689	if (RT_FAILURE(vrc))
690	{
691	rc = NS_ERROR_FAILURE;
692	continue;
693	}
694	vrc = RTPathAppend(szCompDir, sizeof(szCompDir), "components");
695	if (RT_FAILURE(vrc))
696	{
697	rc = NS_ERROR_FAILURE;
698	continue;
699	}
700	LogFlowFunc(("component directory : \"%s\"\n", szCompDir));
701
702	nsCOMPtr<DirectoryServiceProvider> dsProv;
703	dsProv = new DirectoryServiceProvider();
704	if (dsProv)
705	rc = dsProv->init(szCompReg, szXptiDat, szCompDir, szAppHomeDir);
706	else
707	rc = NS_ERROR_OUT_OF_MEMORY;
708	if (NS_FAILED(rc))
709	break;
710
711	/* Setup the application path for NS_InitXPCOM2. Note that we properly
712	* answer the NS_XPCOM_CURRENT_PROCESS_DIR query in our directory
713	* service provider but it seems to be activated after the directory
714	* service is used for the first time (see the source NS_InitXPCOM2). So
715	* use the same value here to be on the safe side. */
716	nsCOMPtr <nsIFile> appDir;
717	{
718	char *appDirCP = NULL;
719	vrc = RTStrUtf8ToCurrentCP(&appDirCP, szAppHomeDir);
720	if (RT_SUCCESS(vrc))
721	{
722	nsCOMPtr<nsILocalFile> file;
723	rc = NS_NewNativeLocalFile(nsEmbedCString(appDirCP),
724	PR_FALSE, getter_AddRefs(file));
725	if (NS_SUCCEEDED(rc))
726	appDir = do_QueryInterface(file, &rc);
727
728	RTStrFree(appDirCP);
729	}
730	else
731	rc = NS_ERROR_FAILURE;
732	}
733	if (NS_FAILED(rc))
734	break;
735
736	/* Set VBOX_XPCOM_HOME to the same app path to make XPCOM sources that
737	* still use it instead of the directory service happy */
738	vrc = RTEnvSetEx(RTENV_DEFAULT, "VBOX_XPCOM_HOME", szAppHomeDir);
739	AssertRC(vrc);
740
741	/* Finally, initialize XPCOM */
742	{
743	nsCOMPtr<nsIServiceManager> serviceManager;
744	rc = NS_InitXPCOM2(getter_AddRefs(serviceManager), appDir, dsProv);
745	if (NS_SUCCEEDED(rc))
746	{
747	nsCOMPtr<nsIComponentRegistrar> registrar =
748	do_QueryInterface(serviceManager, &rc);
749	if (NS_SUCCEEDED(rc))
750	{
751	rc = registrar->AutoRegister(nsnull);
752	if (NS_SUCCEEDED(rc))
753	{
754	/* We succeeded, stop probing paths */
755	LogFlowFunc(("Succeeded.\n"));
756	break;
757	}
758	}
759	}
760	}
761
762	/* clean up before the new try */
763	HRESULT rc2 = NS_ShutdownXPCOM(nsnull);
764	if (SUCCEEDED(rc))
765	rc = rc2;
766
767	if (i == 0)
768	{
769	/* We failed with VBOX_APP_HOME, don't probe other paths */
770	break;
771	}
772	}
773
774	#endif /* !defined(VBOX_WITH_XPCOM) */
775
776	AssertComRCReturnRC(rc);
777
778	// for both COM and XPCOM, we only get here if this is the main thread;
779	// only then initialize the autolock system (AutoLock.cpp)
780	Assert(RTThreadIsMain(RTThreadSelf()));
781	util::InitAutoLockSystem();
782
783	/*
784	* Init the main event queue (ASSUMES it cannot fail).
785	*/
786	if (SUCCEEDED(rc))
787	NativeEventQueue::init();
788
789	return rc;
790	}
791
792	HRESULT Shutdown()
793	{
794	HRESULT rc = S_OK;
795
796	#if !defined(VBOX_WITH_XPCOM)
797
798	/* EventQueue::uninit reference counting fun. */
799	RTTHREAD hSelf = RTThreadSelf();
800	if ( hSelf == gCOMMainThread
801	&& hSelf != NIL_RTTHREAD)
802	{
803	if (-- gCOMMainInitCount == 0)
804	{
805	NativeEventQueue::uninit();
806	ASMAtomicWriteHandle(&gCOMMainThread, NIL_RTTHREAD);
807	}
808	}
809
810	CoUninitialize();
811
812	#else /* !defined(VBOX_WITH_XPCOM) */
813
814	nsCOMPtr<nsIEventQueue> eventQ;
815	rc = NS_GetMainEventQ(getter_AddRefs(eventQ));
816
817	if (NS_SUCCEEDED(rc) \|\| rc == NS_ERROR_NOT_AVAILABLE)
818	{
819	/* NS_ERROR_NOT_AVAILABLE seems to mean that
820	* nsIEventQueue::StopAcceptingEvents() has been called (see
821	* nsEventQueueService.cpp). We hope that this error code always means
822	* just that in this case and assume that we're on the main thread
823	* (it's a kind of unexpected behavior if a non-main thread ever calls
824	* StopAcceptingEvents() on the main event queue). */
825
826	PRBool isOnMainThread = PR_FALSE;
827	if (NS_SUCCEEDED(rc))
828	{
829	rc = eventQ->IsOnCurrentThread(&isOnMainThread);
830	eventQ = nsnull; /* early release before shutdown */
831	}
832	else
833	{
834	isOnMainThread = RTThreadIsMain(RTThreadSelf());
835	rc = NS_OK;
836	}
837
838	if (NS_SUCCEEDED(rc) && isOnMainThread)
839	{
840	/* only the main thread needs to uninitialize XPCOM and only if
841	* init counter drops to zero */
842	if (--gXPCOMInitCount == 0)
843	{
844	NativeEventQueue::uninit();
845	rc = NS_ShutdownXPCOM(nsnull);
846
847	/* This is a thread initialized XPCOM and set gIsXPCOMInitialized to
848	* true. Reset it back to false. */
849	bool wasInited = ASMAtomicXchgBool(&gIsXPCOMInitialized, false);
850	Assert(wasInited == true);
851	NOREF(wasInited);
852	}
853	}
854	}
855
856	#endif /* !defined(VBOX_WITH_XPCOM) */
857
858	AssertComRC(rc);
859
860	return rc;
861	}
862
863	} /* namespace com */

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source: vbox/trunk/src/VBox/Main/glue/initterm.cpp@ 98103

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