SUPR3HardenedVerify.cpp@ 98103

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1	/* $Id: SUPR3HardenedVerify.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* VirtualBox Support Library - Verification of Hardened Installation.
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	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#if defined(RT_OS_OS2)
42	# define INCL_BASE
43	# define INCL_ERRORS
44	# include <os2.h>
45	# include <stdio.h>
46	# include <stdlib.h>
47	# include <unistd.h>
48	# include <sys/fcntl.h>
49	# include <sys/errno.h>
50	# include <sys/syslimits.h>
51
52	#elif defined(RT_OS_WINDOWS)
53	# include <iprt/nt/nt-and-windows.h>
54	# ifndef IN_SUP_HARDENED_R3
55	# include <stdio.h>
56	# endif
57
58	#else /* UNIXes */
59	# include <sys/types.h>
60	# include <stdio.h>
61	# include <stdlib.h>
62	# include <dirent.h>
63	# include <dlfcn.h>
64	# include <fcntl.h>
65	# include <limits.h>
66	# include <errno.h>
67	# include <unistd.h>
68	# include <sys/stat.h>
69	# include <sys/time.h>
70	# include <sys/fcntl.h>
71	# include <pwd.h>
72	# ifdef RT_OS_DARWIN
73	# include <mach-o/dyld.h>
74	# endif
75
76	#endif
77
78	#include <VBox/sup.h>
79	#include <VBox/err.h>
80	#include <iprt/asm.h>
81	#include <iprt/ctype.h>
82	#include <iprt/param.h>
83	#include <iprt/path.h>
84	#include <iprt/string.h>
85	#include <iprt/utf16.h>
86
87	#include "SUPLibInternal.h"
88	#if defined(RT_OS_WINDOWS) && defined(VBOX_WITH_HARDENING)
89	# define SUPHNTVI_NO_NT_STUFF
90	# include "win/SUPHardenedVerify-win.h"
91	#endif
92
93
94	/*********************************************************************************************************************************
95	* Defined Constants And Macros *
96	*********************************************************************************************************************************/
97	/** The max path length acceptable for a trusted path. */
98	#define SUPR3HARDENED_MAX_PATH 260U
99
100	/** Enable to resolve symlinks using realpath() instead of cooking our own stuff. */
101	#define SUP_HARDENED_VERIFY_FOLLOW_SYMLINKS_USE_REALPATH 1
102
103	#ifdef RT_OS_SOLARIS
104	# define dirfd(d) ((d)->d_fd)
105	#endif
106
107	/** Compare table file names with externally supplied names. */
108	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
109	# define SUP_COMP_FILENAME RTStrICmp
110	#else
111	# define SUP_COMP_FILENAME suplibHardenedStrCmp
112	#endif
113
114
115	/*********************************************************************************************************************************
116	* Global Variables *
117	*********************************************************************************************************************************/
118	/**
119	* The files that gets verified.
120	*
121	* @todo This needs reviewing against the linux packages.
122	* @todo The excessive use of kSupID_AppSharedLib needs to be reviewed at some point. For
123	* the time being we're building the linux packages with SharedLib pointing to
124	* AppPrivArch (lazy bird).
125	*
126	* @remarks If you add executables here, you might need to update
127	* g_apszSupNtVpAllowedVmExes in SUPHardenedVerifyProcess-win.cpp.
128	*/
129	static SUPINSTFILE const g_aSupInstallFiles[] =
130	{
131	/* type, dir, fOpt, "pszFile" */
132	/* ---------------------------------------------------------------------- */
133	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VMMR0.r0" },
134	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDDR0.r0" },
135
136	#ifdef VBOX_WITH_RAW_MODE
137	{ kSupIFT_Rc, kSupID_AppPrivArch, false, "VMMRC.rc" },
138	{ kSupIFT_Rc, kSupID_AppPrivArch, false, "VBoxDDRC.rc" },
139	#endif
140
141	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxRT" SUPLIB_DLL_SUFF },
142	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxVMM" SUPLIB_DLL_SUFF },
143	#if HC_ARCH_BITS == 32
144	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxREM32" SUPLIB_DLL_SUFF },
145	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxREM64" SUPLIB_DLL_SUFF },
146	#endif
147	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxDD" SUPLIB_DLL_SUFF },
148	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxDD2" SUPLIB_DLL_SUFF },
149	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxDDU" SUPLIB_DLL_SUFF },
150	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxVMMPreload" SUPLIB_EXE_SUFF },
151	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxVMMPreload" SUPLIB_DLL_SUFF },
152
153	//#ifdef VBOX_WITH_DEBUGGER_GUI
154	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxDbg" SUPLIB_DLL_SUFF },
155	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxDbg3" SUPLIB_DLL_SUFF },
156	//#endif
157
158	//#ifdef VBOX_WITH_SHARED_CLIPBOARD
159	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedClipboard" SUPLIB_DLL_SUFF },
160	//#endif
161	//#ifdef VBOX_WITH_SHARED_FOLDERS
162	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedFolders" SUPLIB_DLL_SUFF },
163	//#endif
164	//#ifdef VBOX_WITH_DRAG_AND_DROP
165	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxDragAndDropSvc" SUPLIB_DLL_SUFF },
166	//#endif
167	//#ifdef VBOX_WITH_GUEST_PROPS
168	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxGuestPropSvc" SUPLIB_DLL_SUFF },
169	//#endif
170	//#ifdef VBOX_WITH_GUEST_CONTROL
171	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxGuestControlSvc" SUPLIB_DLL_SUFF },
172	//#endif
173	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxHostChannel" SUPLIB_DLL_SUFF },
174	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedCrOpenGL" SUPLIB_DLL_SUFF },
175	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhostcrutil" SUPLIB_DLL_SUFF },
176	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhosterrorspu" SUPLIB_DLL_SUFF },
177	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLrenderspu" SUPLIB_DLL_SUFF },
178
179	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxManage" SUPLIB_EXE_SUFF },
180
181	#ifdef VBOX_WITH_MAIN
182	{ kSupIFT_Exe, kSupID_AppBin, false, "VBoxSVC" SUPLIB_EXE_SUFF },
183	#ifdef RT_OS_WINDOWS
184	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxC" SUPLIB_DLL_SUFF },
185	#else
186	{ kSupIFT_Exe, kSupID_AppPrivArch, false, "VBoxXPCOMIPCD" SUPLIB_EXE_SUFF },
187	{ kSupIFT_Dll, kSupID_AppSharedLib, false, "VBoxXPCOM" SUPLIB_DLL_SUFF },
188	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxXPCOMIPCC" SUPLIB_DLL_SUFF },
189	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxC" SUPLIB_DLL_SUFF },
190	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxSVCM" SUPLIB_DLL_SUFF },
191	{ kSupIFT_Data, kSupID_AppPrivArchComp, false, "VBoxXPCOMBase.xpt" },
192	#endif
193	#endif
194
195	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VRDPAuth" SUPLIB_DLL_SUFF },
196	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxAuth" SUPLIB_DLL_SUFF },
197	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxVRDP" SUPLIB_DLL_SUFF },
198
199	//#ifdef VBOX_WITH_HEADLESS
200	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxHeadless" SUPLIB_EXE_SUFF },
201	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxHeadless" SUPLIB_DLL_SUFF },
202	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxVideoRecFB" SUPLIB_DLL_SUFF },
203	//#endif
204
205	//#ifdef VBOX_WITH_QTGUI
206	{ kSupIFT_Exe, kSupID_AppBin, true, "VirtualBox" SUPLIB_EXE_SUFF },
207	# ifdef RT_OS_DARWIN
208	{ kSupIFT_Exe, kSupID_AppMacHelper, true, "VirtualBoxVM" SUPLIB_EXE_SUFF },
209	# else
210	{ kSupIFT_Exe, kSupID_AppBin, true, "VirtualBoxVM" SUPLIB_EXE_SUFF },
211	# endif
212	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VirtualBoxVM" SUPLIB_DLL_SUFF },
213	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "UICommon" SUPLIB_DLL_SUFF },
214	# if !defined(RT_OS_DARWIN) && !defined(RT_OS_WINDOWS) && !defined(RT_OS_OS2)
215	{ kSupIFT_Dll, kSupID_AppSharedLib, true, "VBoxKeyboard" SUPLIB_DLL_SUFF },
216	# endif
217	//#endif
218
219	//#ifdef VBOX_WITH_VBOXSDL
220	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxSDL" SUPLIB_EXE_SUFF },
221	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSDL" SUPLIB_DLL_SUFF },
222	//#endif
223
224	//#ifdef VBOX_WITH_WEBSERVICES
225	{ kSupIFT_Exe, kSupID_AppBin, true, "vboxwebsrv" SUPLIB_EXE_SUFF },
226	//#endif
227
228	#ifdef RT_OS_LINUX
229	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxTunctl" SUPLIB_EXE_SUFF },
230	#endif
231
232	//#ifdef VBOX_WITH_NETFLT
233	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxNetDHCP" SUPLIB_EXE_SUFF },
234	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxNetDHCP" SUPLIB_DLL_SUFF },
235	//#endif
236
237	//#ifdef VBOX_WITH_LWIP_NAT
238	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxNetNAT" SUPLIB_EXE_SUFF },
239	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxNetNAT" SUPLIB_DLL_SUFF },
240	//#endif
241	#if defined(VBOX_WITH_HARDENING) && defined(RT_OS_WINDOWS)
242	# define HARDENED_TESTCASE_BIN_ENTRY(a_szName) \
243	{ kSupIFT_TestExe, kSupID_AppBin, true, a_szName SUPLIB_EXE_SUFF }, \
244	{ kSupIFT_TestDll, kSupID_AppBin, true, a_szName SUPLIB_DLL_SUFF }
245	HARDENED_TESTCASE_BIN_ENTRY("tstMicro"),
246	HARDENED_TESTCASE_BIN_ENTRY("tstPDMAsyncCompletion"),
247	HARDENED_TESTCASE_BIN_ENTRY("tstPDMAsyncCompletionStress"),
248	HARDENED_TESTCASE_BIN_ENTRY("tstVMM"),
249	HARDENED_TESTCASE_BIN_ENTRY("tstVMREQ"),
250	# define HARDENED_TESTCASE_ENTRY(a_szName) \
251	{ kSupIFT_TestExe, kSupID_Testcase, true, a_szName SUPLIB_EXE_SUFF }, \
252	{ kSupIFT_TestDll, kSupID_Testcase, true, a_szName SUPLIB_DLL_SUFF }
253	HARDENED_TESTCASE_ENTRY("tstCFGM"),
254	HARDENED_TESTCASE_ENTRY("tstGIP-2"),
255	HARDENED_TESTCASE_ENTRY("tstIntNet-1"),
256	HARDENED_TESTCASE_ENTRY("tstMMHyperHeap"),
257	HARDENED_TESTCASE_ENTRY("tstRTR0ThreadPreemptionDriver"),
258	HARDENED_TESTCASE_ENTRY("tstRTR0MemUserKernelDriver"),
259	HARDENED_TESTCASE_ENTRY("tstRTR0SemMutexDriver"),
260	HARDENED_TESTCASE_ENTRY("tstRTR0TimerDriver"),
261	HARDENED_TESTCASE_ENTRY("tstSSM"),
262	#endif
263	};
264
265
266	/** Array parallel to g_aSupInstallFiles containing per-file status info. */
267	static SUPVERIFIEDFILE g_aSupVerifiedFiles[RT_ELEMENTS(g_aSupInstallFiles)];
268
269	/** Array index by install directory specifier containing info about verified directories. */
270	static SUPVERIFIEDDIR g_aSupVerifiedDirs[kSupID_End];
271
272
273	/**
274	* Assembles the path to a directory.
275	*
276	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
277	* decides whether it returns or not).
278	*
279	* @param enmDir The directory.
280	* @param pszDst Where to assemble the path.
281	* @param cchDst The size of the buffer.
282	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
283	* @param pFile The file (for darwin helper app paths).
284	*/
285	static int supR3HardenedMakePath(SUPINSTDIR enmDir, char *pszDst, size_t cchDst, bool fFatal, PCSUPINSTFILE pFile)
286	{
287	int rc;
288	switch (enmDir)
289	{
290	case kSupID_AppBin:
291	rc = supR3HardenedPathAppBin(pszDst, cchDst);
292	break;
293	case kSupID_AppSharedLib:
294	rc = supR3HardenedPathAppSharedLibs(pszDst, cchDst);
295	break;
296	case kSupID_AppPrivArch:
297	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
298	break;
299	case kSupID_AppPrivArchComp:
300	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
301	if (RT_SUCCESS(rc))
302	{
303	size_t off = suplibHardenedStrLen(pszDst);
304	if (cchDst - off >= sizeof("/components"))
305	suplibHardenedMemCopy(&pszDst[off], "/components", sizeof("/components"));
306	else
307	rc = VERR_BUFFER_OVERFLOW;
308	}
309	break;
310	case kSupID_AppPrivNoArch:
311	rc = supR3HardenedPathAppPrivateNoArch(pszDst, cchDst);
312	break;
313	case kSupID_Testcase:
314	rc = supR3HardenedPathAppBin(pszDst, cchDst);
315	if (RT_SUCCESS(rc))
316	{
317	size_t off = suplibHardenedStrLen(pszDst);
318	if (cchDst - off >= sizeof("/testcase"))
319	suplibHardenedMemCopy(&pszDst[off], "/testcase", sizeof("/testcase"));
320	else
321	rc = VERR_BUFFER_OVERFLOW;
322	}
323	break;
324	#ifdef RT_OS_DARWIN
325	case kSupID_AppMacHelper:
326	rc = supR3HardenedPathAppBin(pszDst, cchDst);
327	if (RT_SUCCESS(rc))
328	{
329	/* Up one level from the VirtualBox.app/Contents/MacOS directory: */
330	size_t offDst = suplibHardenedStrLen(pszDst);
331	while (offDst > 1 && pszDst[offDst - 1] == '/')
332	offDst--;
333	while (offDst > 1 && pszDst[offDst - 1] != '/')
334	offDst--;
335
336	/* Construct the path to the helper application's Contents/MacOS directory: */
337	size_t cchFile = suplibHardenedStrLen(pFile->pszFile);
338	if (offDst + cchFile + sizeof("Resources/.app/Contents/MacOS") <= cchDst)
339	{
340	suplibHardenedMemCopy(&pszDst[offDst], RT_STR_TUPLE("Resources/"));
341	offDst += sizeof("Resources/") - 1;
342	suplibHardenedMemCopy(&pszDst[offDst], pFile->pszFile, cchFile);
343	offDst += cchFile;
344	suplibHardenedMemCopy(&pszDst[offDst], RT_STR_TUPLE(".app/Contents/MacOS") + 1);
345	}
346	else
347	rc = VERR_BUFFER_OVERFLOW;
348	}
349	break;
350	#endif
351	default:
352	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
353	"supR3HardenedMakePath: enmDir=%d\n", enmDir);
354	}
355	if (RT_FAILURE(rc))
356	supR3HardenedError(rc, fFatal,
357	"supR3HardenedMakePath: enmDir=%d rc=%d\n", enmDir, rc);
358	NOREF(pFile);
359	return rc;
360	}
361
362
363
364	/**
365	* Assembles the path to a file table entry, with or without the actual filename.
366	*
367	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
368	* decides whether it returns or not).
369	*
370	* @param pFile The file table entry.
371	* @param pszDst Where to assemble the path.
372	* @param cchDst The size of the buffer.
373	* @param fWithFilename If set, the filename is included, otherwise it is omitted (no trailing slash).
374	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
375	*/
376	static int supR3HardenedMakeFilePath(PCSUPINSTFILE pFile, char *pszDst, size_t cchDst, bool fWithFilename, bool fFatal)
377	{
378	/*
379	* Combine supR3HardenedMakePath and the filename.
380	*/
381	int rc = supR3HardenedMakePath(pFile->enmDir, pszDst, cchDst, fFatal, pFile);
382	if (RT_SUCCESS(rc) && fWithFilename)
383	{
384	size_t cchFile = suplibHardenedStrLen(pFile->pszFile);
385	size_t off = suplibHardenedStrLen(pszDst);
386	if (cchDst - off >= cchFile + 2)
387	{
388	pszDst[off++] = '/';
389	suplibHardenedMemCopy(&pszDst[off], pFile->pszFile, cchFile + 1);
390	}
391	else
392	rc = supR3HardenedError(VERR_BUFFER_OVERFLOW, fFatal,
393	"supR3HardenedMakeFilePath: pszFile=%s off=%lu\n",
394	pFile->pszFile, (long)off);
395	}
396	return rc;
397	}
398
399
400	/**
401	* Verifies a directory.
402	*
403	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
404	* fFatal is clear and if it's set the function wont return.
405	* @param enmDir The directory specifier.
406	* @param fFatal Whether validation failures should be treated as
407	* fatal (true) or not (false).
408	* @param pFile The file (for darwin helper app paths).
409	*/
410	DECLHIDDEN(int) supR3HardenedVerifyFixedDir(SUPINSTDIR enmDir, bool fFatal, PCSUPINSTFILE pFile)
411	{
412	/*
413	* Validate the index just to be on the safe side...
414	*/
415	if (enmDir <= kSupID_Invalid \|\| enmDir >= kSupID_End)
416	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
417	"supR3HardenedVerifyDir: enmDir=%d\n", enmDir);
418
419	/*
420	* Already validated?
421	*/
422	if (g_aSupVerifiedDirs[enmDir].fValidated)
423	return VINF_SUCCESS; /** @todo revalidate? */
424
425	/* initialize the entry. */
426	if (g_aSupVerifiedDirs[enmDir].hDir != 0)
427	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
428	"supR3HardenedVerifyDir: hDir=%p enmDir=%d\n",
429	(void *)g_aSupVerifiedDirs[enmDir].hDir, enmDir);
430	g_aSupVerifiedDirs[enmDir].hDir = -1;
431	g_aSupVerifiedDirs[enmDir].fValidated = false;
432
433	/*
434	* Make the path and open the directory.
435	*/
436	char szPath[RTPATH_MAX];
437	int rc = supR3HardenedMakePath(enmDir, szPath, sizeof(szPath), fFatal, pFile);
438	if (RT_SUCCESS(rc))
439	{
440	#if defined(RT_OS_WINDOWS)
441	PRTUTF16 pwszPath;
442	rc = RTStrToUtf16(szPath, &pwszPath);
443	if (RT_SUCCESS(rc))
444	{
445	HANDLE hDir = CreateFileW(pwszPath,
446	GENERIC_READ,
447	FILE_SHARE_READ \| FILE_SHARE_DELETE \| FILE_SHARE_WRITE,
448	NULL,
449	OPEN_EXISTING,
450	FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_BACKUP_SEMANTICS,
451	NULL);
452	if (hDir != INVALID_HANDLE_VALUE)
453	{
454	/** @todo check the type */
455	/* That's all on windows, for now at least... */
456	g_aSupVerifiedDirs[enmDir].hDir = (intptr_t)hDir;
457	g_aSupVerifiedDirs[enmDir].fValidated = true;
458	}
459	else if (enmDir == kSupID_Testcase)
460	{
461	g_aSupVerifiedDirs[enmDir].fValidated = true;
462	rc = VINF_SUCCESS; /* Optional directory, ignore if missing. */
463	}
464	else
465	{
466	int err = RtlGetLastWin32Error();
467	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
468	"supR3HardenedVerifyDir: Failed to open \"%s\": err=%d\n",
469	szPath, err);
470	}
471	RTUtf16Free(pwszPath);
472	}
473	else
474	rc = supR3HardenedError(rc, fFatal,
475	"supR3HardenedVerifyDir: Failed to convert \"%s\" to UTF-16: err=%d\n", szPath, rc);
476
477	#else /* UNIXY */
478	int fd = open(szPath, O_RDONLY, 0);
479	if (fd >= 0)
480	{
481	/*
482	* On unixy systems we'll make sure the directory is owned by root
483	* and not writable by the group and user.
484	*/
485	struct stat st;
486	if (!fstat(fd, &st))
487	{
488
489	if ( st.st_uid == 0
490	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
491	&& S_ISDIR(st.st_mode))
492	{
493	g_aSupVerifiedDirs[enmDir].hDir = fd;
494	g_aSupVerifiedDirs[enmDir].fValidated = true;
495	}
496	else
497	{
498	if (!S_ISDIR(st.st_mode))
499	rc = supR3HardenedError(VERR_NOT_A_DIRECTORY, fFatal,
500	"supR3HardenedVerifyDir: \"%s\" is not a directory\n",
501	szPath, (long)st.st_uid);
502	else if (st.st_uid)
503	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
504	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": not owned by root (st_uid=%ld)\n",
505	szPath, (long)st.st_uid);
506	else
507	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
508	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": group and/or other writable (st_mode=0%lo)\n",
509	szPath, (long)st.st_mode);
510	close(fd);
511	}
512	}
513	else
514	{
515	int err = errno;
516	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
517	"supR3HardenedVerifyDir: Failed to fstat \"%s\": %s (%d)\n",
518	szPath, strerror(err), err);
519	close(fd);
520	}
521	}
522	else if (enmDir == kSupID_Testcase)
523	{
524	g_aSupVerifiedDirs[enmDir].fValidated = true;
525	rc = VINF_SUCCESS; /* Optional directory, ignore if missing. */
526	}
527	else
528	{
529	int err = errno;
530	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
531	"supR3HardenedVerifyDir: Failed to open \"%s\": %s (%d)\n",
532	szPath, strerror(err), err);
533	}
534	#endif /* UNIXY */
535	}
536
537	return rc;
538	}
539
540
541	#ifdef RT_OS_WINDOWS
542	/**
543	* Opens the file for verification.
544	*
545	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
546	* fFatal is clear and if it's set the function wont return.
547	* @param pFile The file entry.
548	* @param fFatal Whether validation failures should be treated as
549	* kl fatal (true) or not (false).
550	* @param phFile The file handle, set to -1 if we failed to open
551	* the file. The function may return VINF_SUCCESS
552	* and a -1 handle if the file is optional.
553	*/
554	static int supR3HardenedVerifyFileOpen(PCSUPINSTFILE pFile, bool fFatal, intptr_t *phFile)
555	{
556	*phFile = -1;
557
558	char szPath[RTPATH_MAX];
559	int rc = supR3HardenedMakeFilePath(pFile, szPath, sizeof(szPath), true /fWithFilename/, fFatal);
560	if (RT_SUCCESS(rc))
561	{
562	PRTUTF16 pwszPath;
563	rc = RTStrToUtf16(szPath, &pwszPath);
564	if (RT_SUCCESS(rc))
565	{
566	HANDLE hFile = CreateFileW(pwszPath,
567	GENERIC_READ,
568	FILE_SHARE_READ,
569	NULL,
570	OPEN_EXISTING,
571	FILE_ATTRIBUTE_NORMAL,
572	NULL);
573	if (hFile != INVALID_HANDLE_VALUE)
574	{
575	*phFile = (intptr_t)hFile;
576	rc = VINF_SUCCESS;
577	}
578	else
579	{
580	int err = RtlGetLastWin32Error();
581	if ( !pFile->fOptional
582	\|\| ( err != ERROR_FILE_NOT_FOUND
583	&& (err != ERROR_PATH_NOT_FOUND \|\| pFile->enmDir != kSupID_Testcase) ) )
584	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
585	"supR3HardenedVerifyFileInternal: Failed to open '%s': err=%d\n", szPath, err);
586	}
587	RTUtf16Free(pwszPath);
588	}
589	else
590	rc = supR3HardenedError(rc, fFatal, "supR3HardenedVerifyFileInternal: Failed to convert '%s' to UTF-16: %Rrc\n",
591	szPath, rc);
592	}
593	return rc;
594	}
595
596
597	/**
598	* Worker for supR3HardenedVerifyFileInternal.
599	*
600	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
601	* fFatal is clear and if it's set the function wont return.
602	* @param pFile The file entry.
603	* @param pVerified The verification record.
604	* @param fFatal Whether validation failures should be treated as
605	* fatal (true) or not (false).
606	* @param fLeaveFileOpen Whether the file should be left open.
607	*/
608	static int supR3HardenedVerifyFileSignature(PCSUPINSTFILE pFile, PSUPVERIFIEDFILE pVerified, bool fFatal, bool fLeaveFileOpen)
609	{
610	# if defined(VBOX_WITH_HARDENING) && !defined(IN_SUP_R3_STATIC) /* Latter: Not in VBoxCpuReport and friends. */
611
612	/*
613	* Open the file if we have to.
614	*/
615	int rc;
616	intptr_t hFileOpened;
617	intptr_t hFile = pVerified->hFile;
618	if (hFile != -1)
619	hFileOpened = -1;
620	else
621	{
622	rc = supR3HardenedVerifyFileOpen(pFile, fFatal, &hFileOpened);
623	if (RT_FAILURE(rc))
624	return rc;
625	hFile = hFileOpened;
626	}
627
628	/*
629	* Verify the signature.
630	*/
631	char szErr[1024];
632	RTERRINFO ErrInfo;
633	RTErrInfoInit(&ErrInfo, szErr, sizeof(szErr));
634
635	uint32_t fFlags = SUPHNTVI_F_REQUIRE_BUILD_CERT;
636	if (pFile->enmType == kSupIFT_Rc)
637	fFlags \|= SUPHNTVI_F_RC_IMAGE;
638
639	rc = supHardenedWinVerifyImageByHandleNoName((HANDLE)hFile, fFlags, &ErrInfo);
640	if (RT_SUCCESS(rc))
641	pVerified->fCheckedSignature = true;
642	else
643	{
644	pVerified->fCheckedSignature = false;
645	rc = supR3HardenedError(rc, fFatal, "supR3HardenedVerifyFileInternal: '%s': Image verify error rc=%Rrc: %s\n",
646	pFile->pszFile, rc, szErr);
647
648	}
649
650	/*
651	* Close the handle if we opened the file and we should close it.
652	*/
653	if (hFileOpened != -1)
654	{
655	if (fLeaveFileOpen && RT_SUCCESS(rc))
656	pVerified->hFile = hFileOpened;
657	else
658	NtClose((HANDLE)hFileOpened);
659	}
660
661	return rc;
662
663	# else /* Not checking signatures. */
664	RT_NOREF4(pFile, pVerified, fFatal, fLeaveFileOpen);
665	return VINF_SUCCESS;
666	# endif /* Not checking signatures. */
667	}
668	#endif
669
670
671	/**
672	* Verifies a file entry.
673	*
674	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
675	* fFatal is clear and if it's set the function wont return.
676	*
677	* @param iFile The file table index of the file to be verified.
678	* @param fFatal Whether validation failures should be treated as
679	* fatal (true) or not (false).
680	* @param fLeaveFileOpen Whether the file should be left open.
681	* @param fVerifyAll Set if this is an verify all call and we will
682	* postpone signature checking.
683	*/
684	static int supR3HardenedVerifyFileInternal(int iFile, bool fFatal, bool fLeaveFileOpen, bool fVerifyAll)
685	{
686	#ifndef RT_OS_WINDOWS
687	RT_NOREF1(fVerifyAll);
688	#endif
689	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
690	PSUPVERIFIEDFILE pVerified = &g_aSupVerifiedFiles[iFile];
691
692	/*
693	* Already done validation? Do signature validation if we haven't yet.
694	*/
695	if (pVerified->fValidated)
696	{
697	/** @todo revalidate? Check that the file hasn't been replace or similar. */
698	#ifdef RT_OS_WINDOWS
699	if (!pVerified->fCheckedSignature && !fVerifyAll)
700	return supR3HardenedVerifyFileSignature(pFile, pVerified, fFatal, fLeaveFileOpen);
701	#endif
702	return VINF_SUCCESS;
703	}
704
705
706	/* initialize the entry. */
707	if (pVerified->hFile != 0)
708	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
709	"supR3HardenedVerifyFileInternal: hFile=%p (%s)\n",
710	(void *)pVerified->hFile, pFile->pszFile);
711	pVerified->hFile = -1;
712	pVerified->fValidated = false;
713	#ifdef RT_OS_WINDOWS
714	pVerified->fCheckedSignature = false;
715	#endif
716
717	/*
718	* Verify the directory then proceed to open it.
719	* (This'll make sure the directory is opened and that we can (later)
720	* use openat if we wish.)
721	*/
722	int rc = supR3HardenedVerifyFixedDir(pFile->enmDir, fFatal, pFile);
723	if (RT_SUCCESS(rc))
724	{
725	#if defined(RT_OS_WINDOWS)
726	rc = supR3HardenedVerifyFileOpen(pFile, fFatal, &pVerified->hFile);
727	if (RT_SUCCESS(rc))
728	{
729	if (!fVerifyAll)
730	rc = supR3HardenedVerifyFileSignature(pFile, pVerified, fFatal, fLeaveFileOpen);
731	if (RT_SUCCESS(rc))
732	{
733	pVerified->fValidated = true;
734	if (!fLeaveFileOpen)
735	{
736	NtClose((HANDLE)pVerified->hFile);
737	pVerified->hFile = -1;
738	}
739	}
740	}
741	#else /* !RT_OS_WINDOWS */
742	char szPath[RTPATH_MAX];
743	rc = supR3HardenedMakeFilePath(pFile, szPath, sizeof(szPath), true /fWithFilename/, fFatal);
744	if (RT_SUCCESS(rc))
745	{
746	int fd = open(szPath, O_RDONLY, 0);
747	if (fd >= 0)
748	{
749	/*
750	* On unixy systems we'll make sure the file is owned by root
751	* and not writable by the group and user.
752	*/
753	struct stat st;
754	if (!fstat(fd, &st))
755	{
756	if ( st.st_uid == 0
757	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
758	&& S_ISREG(st.st_mode))
759	{
760	/* it's valid. */
761	if (fLeaveFileOpen)
762	pVerified->hFile = fd;
763	else
764	close(fd);
765	pVerified->fValidated = true;
766	}
767	else
768	{
769	if (!S_ISREG(st.st_mode))
770	rc = supR3HardenedError(VERR_IS_A_DIRECTORY, fFatal,
771	"supR3HardenedVerifyFileInternal: \"%s\" is not a regular file\n",
772	szPath, (long)st.st_uid);
773	else if (st.st_uid)
774	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
775	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%s\": not owned by root (st_uid=%ld)\n",
776	szPath, (long)st.st_uid);
777	else
778	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
779	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%s\": group and/or other writable (st_mode=0%lo)\n",
780	szPath, (long)st.st_mode);
781	close(fd);
782	}
783	}
784	else
785	{
786	int err = errno;
787	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
788	"supR3HardenedVerifyFileInternal: Failed to fstat \"%s\": %s (%d)\n",
789	szPath, strerror(err), err);
790	close(fd);
791	}
792	}
793	else
794	{
795	int err = errno;
796	if (!pFile->fOptional \|\| err != ENOENT)
797	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
798	"supR3HardenedVerifyFileInternal: Failed to open \"%s\": %s (%d)\n",
799	szPath, strerror(err), err);
800	}
801	}
802	#endif /* !RT_OS_WINDOWS */
803	}
804
805	return rc;
806	}
807
808
809	/**
810	* Verifies that the specified table entry matches the given filename.
811	*
812	* @returns VINF_SUCCESS if matching. On mismatch fFatal indicates whether an
813	* error is returned or we terminate the application.
814	*
815	* @param iFile The file table index.
816	* @param pszFilename The filename.
817	* @param fFatal Whether validation failures should be treated as
818	* fatal (true) or not (false).
819	*/
820	static int supR3HardenedVerifySameFile(int iFile, const char *pszFilename, bool fFatal)
821	{
822	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
823
824	/*
825	* Construct the full path for the file table entry
826	* and compare it with the specified file.
827	*/
828	char szName[RTPATH_MAX];
829	int rc = supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
830	if (RT_FAILURE(rc))
831	return rc;
832	if (SUP_COMP_FILENAME(szName, pszFilename))
833	{
834	/*
835	* Normalize the two paths and compare again.
836	*/
837	rc = VERR_NOT_SAME_DEVICE;
838	#if defined(RT_OS_WINDOWS)
839	LPSTR pszIgnored;
840	char szName2[RTPATH_MAX]; /** @todo Must use UTF-16 here! Code is mixing UTF-8 and native. */
841	if ( GetFullPathName(szName, RT_ELEMENTS(szName2), &szName2[0], &pszIgnored)
842	&& GetFullPathName(pszFilename, RT_ELEMENTS(szName), &szName[0], &pszIgnored))
843	if (!SUP_COMP_FILENAME(szName2, szName))
844	rc = VINF_SUCCESS;
845	#else
846	AssertCompile(RTPATH_MAX >= PATH_MAX);
847	char szName2[RTPATH_MAX];
848	if ( realpath(szName, szName2) != NULL
849	&& realpath(pszFilename, szName) != NULL)
850	if (!SUP_COMP_FILENAME(szName2, szName))
851	rc = VINF_SUCCESS;
852	#endif
853
854	if (RT_FAILURE(rc))
855	{
856	supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
857	return supR3HardenedError(rc, fFatal,
858	"supR3HardenedVerifySameFile: \"%s\" isn't the same as \"%s\"\n",
859	pszFilename, szName);
860	}
861	}
862
863	/*
864	* Check more stuff like the stat info if it's an already open file?
865	*/
866
867
868
869	return VINF_SUCCESS;
870	}
871
872
873	/**
874	* Verifies a file.
875	*
876	* @returns VINF_SUCCESS on success.
877	* VERR_NOT_FOUND if the file isn't in the table, this isn't ever a fatal error.
878	* On verification failure, an error code will be returned when fFatal is clear,
879	* otherwise the program will be terminated.
880	*
881	* @param pszFilename The filename.
882	* @param fFatal Whether validation failures should be treated as
883	* fatal (true) or not (false).
884	*/
885	DECLHIDDEN(int) supR3HardenedVerifyFixedFile(const char *pszFilename, bool fFatal)
886	{
887	/*
888	* Lookup the file and check if it's the same file.
889	*/
890	const char *pszName = supR3HardenedPathFilename(pszFilename);
891	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
892	if (!SUP_COMP_FILENAME(pszName, g_aSupInstallFiles[iFile].pszFile))
893	{
894	int rc = supR3HardenedVerifySameFile(iFile, pszFilename, fFatal);
895	if (RT_SUCCESS(rc))
896	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, false /* fLeaveFileOpen /, false / fVerifyAll */);
897	return rc;
898	}
899
900	return VERR_NOT_FOUND;
901	}
902
903
904	/**
905	* Verifies a program, worker for supR3HardenedVerifyAll.
906	*
907	* @returns See supR3HardenedVerifyAll.
908	* @param pszProgName See supR3HardenedVerifyAll.
909	* @param pszExePath The path to the executable.
910	* @param fFatal See supR3HardenedVerifyAll.
911	* @param fLeaveOpen The leave open setting used by
912	* supR3HardenedVerifyAll.
913	* @param fMainFlags Flags supplied to SUPR3HardenedMain.
914	*/
915	static int supR3HardenedVerifyProgram(const char pszProgName, const char pszExePath, bool fFatal,
916	bool fLeaveOpen, uint32_t fMainFlags)
917	{
918	/*
919	* Search the table looking for the executable and the DLL/DYLIB/SO.
920	* Note! On darwin we have a hack in place for VirtualBoxVM helper app
921	* to share VirtualBox.dylib with the VirtualBox app. This ASSUMES
922	* that cchProgNameDll is equal or shorter to the exe name.
923	*/
924	int rc = VINF_SUCCESS;
925	bool fExe = false;
926	bool fDll = false;
927	size_t const cchProgNameExe = suplibHardenedStrLen(pszProgName);
928	#ifndef RT_OS_DARWIN
929	size_t const cchProgNameDll = cchProgNameExe;
930	NOREF(fMainFlags);
931	#else
932	size_t const cchProgNameDll = fMainFlags & SUPSECMAIN_FLAGS_OSX_VM_APP
933	? sizeof("VirtualBox") - 1
934	: cchProgNameExe;
935	if (cchProgNameDll > cchProgNameExe)
936	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
937	"supR3HardenedVerifyProgram: SUPSECMAIN_FLAGS_OSX_VM_APP + '%s'", pszProgName);
938	#endif
939	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
940	if (!suplibHardenedStrNCmp(pszProgName, g_aSupInstallFiles[iFile].pszFile, cchProgNameDll))
941	{
942	if ( ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Dll
943	\|\| g_aSupInstallFiles[iFile].enmType == kSupIFT_TestDll)
944	&& !suplibHardenedStrCmp(&g_aSupInstallFiles[iFile].pszFile[cchProgNameDll], SUPLIB_DLL_SUFF))
945	{
946	/* This only has to be found (once). */
947	if (fDll)
948	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
949	"supR3HardenedVerifyProgram: duplicate DLL entry for \"%s\"\n", pszProgName);
950	else
951	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen,
952	true /* fVerifyAll - check sign later, only final process need check it on load. */);
953	fDll = true;
954	}
955	else if ( ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Exe
956	\|\| g_aSupInstallFiles[iFile].enmType == kSupIFT_TestExe)
957	&& ( cchProgNameExe == cchProgNameDll
958	\|\| !suplibHardenedStrNCmp(pszProgName, g_aSupInstallFiles[iFile].pszFile, cchProgNameExe))
959	&& !suplibHardenedStrCmp(&g_aSupInstallFiles[iFile].pszFile[cchProgNameExe], SUPLIB_EXE_SUFF))
960	{
961	/* Here we'll have to check that the specific program is the same as the entry. */
962	if (fExe)
963	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
964	"supR3HardenedVerifyProgram: duplicate EXE entry for \"%s\"\n", pszProgName);
965	else
966	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen, false /* fVerifyAll */);
967	fExe = true;
968
969	supR3HardenedVerifySameFile(iFile, pszExePath, fFatal);
970	}
971	}
972
973	/*
974	* Check the findings.
975	*/
976	if (RT_SUCCESS(rc))
977	{
978	if (!fDll && !fExe)
979	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
980	"supR3HardenedVerifyProgram: Couldn't find the program \"%s\"\n", pszProgName);
981	else if (!fExe)
982	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
983	"supR3HardenedVerifyProgram: Couldn't find the EXE entry for \"%s\"\n", pszProgName);
984	else if (!fDll)
985	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
986	"supR3HardenedVerifyProgram: Couldn't find the DLL entry for \"%s\"\n", pszProgName);
987	}
988	return rc;
989	}
990
991
992	/**
993	* Verifies all the known files (called from SUPR3HardenedMain).
994	*
995	* @returns VINF_SUCCESS on success.
996	* On verification failure, an error code will be returned when fFatal is clear,
997	* otherwise the program will be terminated.
998	*
999	* @param fFatal Whether validation failures should be treated as
1000	* fatal (true) or not (false).
1001	* @param pszProgName The program name. This is used to verify that
1002	* both the executable and corresponding
1003	* DLL/DYLIB/SO are valid.
1004	* @param pszExePath The path to the executable.
1005	* @param fMainFlags Flags supplied to SUPR3HardenedMain.
1006	*/
1007	DECLHIDDEN(int) supR3HardenedVerifyAll(bool fFatal, const char pszProgName, const char pszExePath, uint32_t fMainFlags)
1008	{
1009	/*
1010	* On windows
1011	*/
1012	#if defined(RT_OS_WINDOWS)
1013	bool fLeaveOpen = true;
1014	#else
1015	bool fLeaveOpen = false;
1016	#endif
1017
1018	/*
1019	* The verify all the files.
1020	*/
1021	int rc = VINF_SUCCESS;
1022	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
1023	{
1024	int rc2 = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen, true /* fVerifyAll */);
1025	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
1026	rc = rc2;
1027	}
1028
1029	/*
1030	* Verify the program name, that is to say, check that it's in the table
1031	* (thus verified above) and verify the signature on platforms where we
1032	* sign things.
1033	*/
1034	int rc2 = supR3HardenedVerifyProgram(pszProgName, pszExePath, fFatal, fLeaveOpen, fMainFlags);
1035	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
1036	rc2 = rc;
1037
1038	return rc;
1039	}
1040
1041
1042	/**
1043	* Copies the N messages into the error buffer and returns @a rc.
1044	*
1045	* @returns Returns @a rc
1046	* @param rc The return code.
1047	* @param pErrInfo The error info structure.
1048	* @param cMsgs The number of messages in the ellipsis.
1049	* @param ... Message parts.
1050	*/
1051	static int supR3HardenedSetErrorN(int rc, PRTERRINFO pErrInfo, unsigned cMsgs, ...)
1052	{
1053	if (pErrInfo)
1054	{
1055	size_t cbErr = pErrInfo->cbMsg;
1056	char *pszErr = pErrInfo->pszMsg;
1057
1058	va_list va;
1059	va_start(va, cMsgs);
1060	while (cMsgs-- > 0 && cbErr > 0)
1061	{
1062	const char pszMsg = va_arg(va, const char );
1063	size_t cchMsg = RT_VALID_PTR(pszMsg) ? suplibHardenedStrLen(pszMsg) : 0;
1064	if (cchMsg >= cbErr)
1065	cchMsg = cbErr - 1;
1066	suplibHardenedMemCopy(pszErr, pszMsg, cchMsg);
1067	pszErr[cchMsg] = '\0';
1068	pszErr += cchMsg;
1069	cbErr -= cchMsg;
1070	}
1071	va_end(va);
1072
1073	pErrInfo->rc = rc;
1074	pErrInfo->fFlags \|= RTERRINFO_FLAGS_SET;
1075	}
1076
1077	return rc;
1078	}
1079
1080
1081	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_LINUX)
1082	/**
1083	* Copies the four messages into the error buffer and returns @a rc.
1084	*
1085	* @returns Returns @a rc
1086	* @param rc The return code.
1087	* @param pErrInfo The error info structure.
1088	* @param pszMsg1 The first message part.
1089	* @param pszMsg2 The second message part.
1090	* @param pszMsg3 The third message part.
1091	* @param pszMsg4 The fourth message part.
1092	*/
1093	static int supR3HardenedSetError4(int rc, PRTERRINFO pErrInfo, const char *pszMsg1,
1094	const char pszMsg2, const char pszMsg3, const char *pszMsg4)
1095	{
1096	return supR3HardenedSetErrorN(rc, pErrInfo, 4, pszMsg1, pszMsg2, pszMsg3, pszMsg4);
1097	}
1098	#endif
1099
1100
1101	/**
1102	* Copies the three messages into the error buffer and returns @a rc.
1103	*
1104	* @returns Returns @a rc
1105	* @param rc The return code.
1106	* @param pErrInfo The error info structure.
1107	* @param pszMsg1 The first message part.
1108	* @param pszMsg2 The second message part.
1109	* @param pszMsg3 The third message part.
1110	*/
1111	static int supR3HardenedSetError3(int rc, PRTERRINFO pErrInfo, const char *pszMsg1,
1112	const char pszMsg2, const char pszMsg3)
1113	{
1114	return supR3HardenedSetErrorN(rc, pErrInfo, 3, pszMsg1, pszMsg2, pszMsg3);
1115	}
1116
1117
1118	#ifdef SOME_UNUSED_FUNCTION
1119	/**
1120	* Copies the two messages into the error buffer and returns @a rc.
1121	*
1122	* @returns Returns @a rc
1123	* @param rc The return code.
1124	* @param pErrInfo The error info structure.
1125	* @param pszMsg1 The first message part.
1126	* @param pszMsg2 The second message part.
1127	*/
1128	static int supR3HardenedSetError2(int rc, PRTERRINFO pErrInfo, const char *pszMsg1,
1129	const char *pszMsg2)
1130	{
1131	return supR3HardenedSetErrorN(rc, pErrInfo, 2, pszMsg1, pszMsg2);
1132	}
1133	#endif
1134
1135
1136	#ifndef SUP_HARDENED_VERIFY_FOLLOW_SYMLINKS_USE_REALPATH
1137	# if defined(RT_OS_DARWIN) \|\| defined(RT_OS_LINUX)
1138	/**
1139	* Copies the error message to the error buffer and returns @a rc.
1140	*
1141	* @returns Returns @a rc
1142	* @param rc The return code.
1143	* @param pErrInfo The error info structure.
1144	* @param pszMsg The message.
1145	*/
1146	static int supR3HardenedSetError(int rc, PRTERRINFO pErrInfo, const char *pszMsg)
1147	{
1148	return supR3HardenedSetErrorN(rc, pErrInfo, 1, pszMsg);
1149	}
1150	# endif
1151	#endif
1152
1153
1154	/**
1155	* Output from a successfull supR3HardenedVerifyPathSanity call.
1156	*/
1157	typedef struct SUPR3HARDENEDPATHINFO
1158	{
1159	/** The length of the path in szCopy. */
1160	uint16_t cch;
1161	/** The number of path components. */
1162	uint16_t cComponents;
1163	/** Set if the path ends with slash, indicating that it's a directory
1164	* reference and not a file reference. The slash has been removed from
1165	* the copy. */
1166	bool fDirSlash;
1167	/** The offset where each path component starts, i.e. the char after the
1168	* slash. The array has cComponents + 1 entries, where the final one is
1169	* cch + 1 so that one can always terminate the current component by
1170	* szPath[aoffComponent[i] - 1] = '\0'. */
1171	uint16_t aoffComponents[32+1];
1172	/** A normalized copy of the path.
1173	* Reserve some extra space so we can be more relaxed about overflow
1174	* checks and terminator paddings, especially when recursing. */
1175	char szPath[SUPR3HARDENED_MAX_PATH * 2];
1176	} SUPR3HARDENEDPATHINFO;
1177	/** Pointer to a parsed path. */
1178	typedef SUPR3HARDENEDPATHINFO *PSUPR3HARDENEDPATHINFO;
1179
1180
1181	/**
1182	* Verifies that the path is absolutely sane, it also parses the path.
1183	*
1184	* A sane path starts at the root (w/ drive letter on DOS derived systems) and
1185	* does not have any relative bits (/../) or unnecessary slashes (/bin//ls).
1186	* Sane paths are less or equal to SUPR3HARDENED_MAX_PATH bytes in length. UNC
1187	* paths are not supported.
1188	*
1189	* @returns VBox status code.
1190	* @param pszPath The path to check.
1191	* @param pErrInfo The error info structure.
1192	* @param pInfo Where to return a copy of the path along with
1193	* parsing information.
1194	*/
1195	static int supR3HardenedVerifyPathSanity(const char *pszPath, PRTERRINFO pErrInfo, PSUPR3HARDENEDPATHINFO pInfo)
1196	{
1197	const char *pszSrc = pszPath;
1198	char *pszDst = pInfo->szPath;
1199
1200	/*
1201	* Check that it's an absolute path and copy the volume/root specifier.
1202	*/
1203	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
1204	if ( !RT_C_IS_ALPHA(pszSrc[0])
1205	\|\| pszSrc[1] != ':'
1206	\|\| !RTPATH_IS_SLASH(pszSrc[2]))
1207	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo, "The path is not absolute: '", pszPath, "'");
1208
1209	*pszDst++ = RT_C_TO_UPPER(pszSrc[0]);
1210	*pszDst++ = ':';
1211	*pszDst++ = RTPATH_SLASH;
1212	pszSrc += 3;
1213
1214	#else
1215	if (!RTPATH_IS_SLASH(pszSrc[0]))
1216	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo, "The path is not absolute: '", pszPath, "'");
1217
1218	*pszDst++ = RTPATH_SLASH;
1219	pszSrc += 1;
1220	#endif
1221
1222	/*
1223	* No path specifying the root or something very shortly thereafter will
1224	* be approved of.
1225	*/
1226	if (pszSrc[0] == '\0')
1227	return supR3HardenedSetError3(VERR_SUPLIB_PATH_IS_ROOT, pErrInfo, "The path is root: '", pszPath, "'");
1228	if ( pszSrc[1] == '\0'
1229	\|\| pszSrc[2] == '\0')
1230	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_SHORT, pErrInfo, "The path is too short: '", pszPath, "'");
1231
1232	#if RTPATH_STYLE == RTPATH_STR_F_STYLE_UNIX
1233	/*
1234	* Skip double slashes.
1235	*/
1236	while (RTPATH_IS_SLASH(*pszSrc))
1237	pszSrc++;
1238	#else
1239	/*
1240	* The root slash should be alone to avoid UNC confusion.
1241	*/
1242	if (RTPATH_IS_SLASH(pszSrc[0]))
1243	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_CLEAN, pErrInfo,
1244	"The path is not clean of leading double slashes: '", pszPath, "'");
1245	#endif
1246	/*
1247	* Check each component. No parent references.
1248	*/
1249	pInfo->cComponents = 0;
1250	pInfo->fDirSlash = false;
1251	while (pszSrc[0])
1252	{
1253	/* Sanity checks. */
1254	if ( pszSrc[0] == '.'
1255	&& pszSrc[1] == '.'
1256	&& RTPATH_IS_SLASH(pszSrc[2]))
1257	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo,
1258	"The path is not absolute: '", pszPath, "'");
1259
1260	/* Record the start of the component. */
1261	if (pInfo->cComponents >= RT_ELEMENTS(pInfo->aoffComponents) - 1)
1262	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_MANY_COMPONENTS, pErrInfo,
1263	"The path has too many components: '", pszPath, "'");
1264	pInfo->aoffComponents[pInfo->cComponents++] = pszDst - &pInfo->szPath[0];
1265
1266	/* Traverse to the end of the component, copying it as we go along. */
1267	while (pszSrc[0])
1268	{
1269	if (RTPATH_IS_SLASH(pszSrc[0]))
1270	{
1271	pszSrc++;
1272	if (*pszSrc)
1273	*pszDst++ = RTPATH_SLASH;
1274	else
1275	pInfo->fDirSlash = true;
1276	break;
1277	}
1278	pszDst++ = pszSrc++;
1279	if ((uintptr_t)(pszDst - &pInfo->szPath[0]) >= SUPR3HARDENED_MAX_PATH)
1280	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo,
1281	"The path is too long: '", pszPath, "'");
1282	}
1283
1284	/* Skip double slashes. */
1285	while (RTPATH_IS_SLASH(*pszSrc))
1286	pszSrc++;
1287	}
1288
1289	/* Terminate the string and enter its length. */
1290	pszDst[0] = '\0';
1291	pszDst[1] = '\0'; /* for aoffComponents */
1292	pInfo->cch = (uint16_t)(pszDst - &pInfo->szPath[0]);
1293	pInfo->aoffComponents[pInfo->cComponents] = pInfo->cch + 1;
1294
1295	return VINF_SUCCESS;
1296	}
1297
1298
1299	/**
1300	* The state information collected by supR3HardenedVerifyFsObject.
1301	*
1302	* This can be used to verify that a directory we've opened for enumeration is
1303	* the same as the one that supR3HardenedVerifyFsObject just verified. It can
1304	* equally be used to verify a native specfied by the user.
1305	*/
1306	typedef struct SUPR3HARDENEDFSOBJSTATE
1307	{
1308	#ifdef RT_OS_WINDOWS
1309	/** Not implemented for windows yet. */
1310	char chTodo;
1311	#else
1312	/** The stat output. */
1313	struct stat Stat;
1314	#endif
1315	} SUPR3HARDENEDFSOBJSTATE;
1316	/** Pointer to a file system object state. */
1317	typedef SUPR3HARDENEDFSOBJSTATE *PSUPR3HARDENEDFSOBJSTATE;
1318	/** Pointer to a const file system object state. */
1319	typedef SUPR3HARDENEDFSOBJSTATE const *PCSUPR3HARDENEDFSOBJSTATE;
1320
1321
1322	/**
1323	* Query information about a file system object by path.
1324	*
1325	* @returns VBox status code, error buffer filled on failure.
1326	* @param pszPath The path to the object.
1327	* @param pFsObjState Where to return the state information.
1328	* @param pErrInfo The error info structure.
1329	*/
1330	static int supR3HardenedQueryFsObjectByPath(char const *pszPath, PSUPR3HARDENEDFSOBJSTATE pFsObjState, PRTERRINFO pErrInfo)
1331	{
1332	#if defined(RT_OS_WINDOWS)
1333	/** @todo Windows hardening. */
1334	pFsObjState->chTodo = 0;
1335	RT_NOREF2(pszPath, pErrInfo);
1336	return VINF_SUCCESS;
1337
1338	#else
1339	/*
1340	* Stat the object, do not follow links.
1341	*/
1342	if (lstat(pszPath, &pFsObjState->Stat) != 0)
1343	{
1344	/* Ignore access errors */
1345	if (errno != EACCES)
1346	return supR3HardenedSetErrorN(VERR_SUPLIB_STAT_FAILED, pErrInfo,
1347	5, "stat failed with ", strerror(errno), " on: '", pszPath, "'");
1348	}
1349
1350	/*
1351	* Read ACLs.
1352	*/
1353	/** @todo */
1354
1355	return VINF_SUCCESS;
1356	#endif
1357	}
1358
1359
1360	/**
1361	* Query information about a file system object by native handle.
1362	*
1363	* @returns VBox status code, error buffer filled on failure.
1364	* @param hNative The native handle to the object @a pszPath
1365	* specifies and this should be verified to be the
1366	* same file system object.
1367	* @param pFsObjState Where to return the state information.
1368	* @param pszPath The path to the object. (For the error message
1369	* only.)
1370	* @param pErrInfo The error info structure.
1371	*/
1372	static int supR3HardenedQueryFsObjectByHandle(RTHCUINTPTR hNative, PSUPR3HARDENEDFSOBJSTATE pFsObjState,
1373	char const *pszPath, PRTERRINFO pErrInfo)
1374	{
1375	#if defined(RT_OS_WINDOWS)
1376	/** @todo Windows hardening. */
1377	pFsObjState->chTodo = 0;
1378	RT_NOREF3(hNative, pszPath, pErrInfo);
1379	return VINF_SUCCESS;
1380
1381	#else
1382	/*
1383	* Stat the object, do not follow links.
1384	*/
1385	if (fstat((int)hNative, &pFsObjState->Stat) != 0)
1386	return supR3HardenedSetErrorN(VERR_SUPLIB_STAT_FAILED, pErrInfo,
1387	5, "fstat failed with ", strerror(errno), " on '", pszPath, "'");
1388
1389	/*
1390	* Read ACLs.
1391	*/
1392	/** @todo */
1393
1394	return VINF_SUCCESS;
1395	#endif
1396	}
1397
1398
1399	/**
1400	* Verifies that the file system object indicated by the native handle is the
1401	* same as the one @a pFsObjState indicates.
1402	*
1403	* @returns VBox status code, error buffer filled on failure.
1404	* @param pFsObjState1 File system object information/state by path.
1405	* @param pFsObjState2 File system object information/state by handle.
1406	* @param pszPath The path to the object @a pFsObjState
1407	* describes. (For the error message.)
1408	* @param pErrInfo The error info structure.
1409	*/
1410	static int supR3HardenedIsSameFsObject(PCSUPR3HARDENEDFSOBJSTATE pFsObjState1, PCSUPR3HARDENEDFSOBJSTATE pFsObjState2,
1411	const char *pszPath, PRTERRINFO pErrInfo)
1412	{
1413	#if defined(RT_OS_WINDOWS)
1414	/** @todo Windows hardening. */
1415	RT_NOREF4(pFsObjState1, pFsObjState2, pszPath, pErrInfo);
1416	return VINF_SUCCESS;
1417
1418	#elif defined(RT_OS_OS2)
1419	RT_NOREF4(pFsObjState1, pFsObjState2, pszPath, pErrInfo);
1420	return VINF_SUCCESS;
1421
1422	#else
1423	/*
1424	* Compare the ino+dev, then the uid+gid and finally the important mode
1425	* bits. Technically the first one should be enough, but we're paranoid.
1426	*/
1427	if ( pFsObjState1->Stat.st_ino != pFsObjState2->Stat.st_ino
1428	\|\| pFsObjState1->Stat.st_dev != pFsObjState2->Stat.st_dev)
1429	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1430	"The native handle is not the same as '", pszPath, "' (ino/dev)");
1431	if ( pFsObjState1->Stat.st_uid != pFsObjState2->Stat.st_uid
1432	\|\| pFsObjState1->Stat.st_gid != pFsObjState2->Stat.st_gid)
1433	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1434	"The native handle is not the same as '", pszPath, "' (uid/gid)");
1435	if ( (pFsObjState1->Stat.st_mode & (S_IFMT \| S_IWUSR \| S_IWGRP \| S_IWOTH))
1436	!= (pFsObjState2->Stat.st_mode & (S_IFMT \| S_IWUSR \| S_IWGRP \| S_IWOTH)))
1437	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1438	"The native handle is not the same as '", pszPath, "' (mode)");
1439	return VINF_SUCCESS;
1440	#endif
1441	}
1442
1443
1444	/**
1445	* Verifies a file system object (file or directory).
1446	*
1447	* @returns VBox status code, error buffer filled on failure.
1448	* @param pFsObjState The file system object information/state to be
1449	* verified.
1450	* @param fDir Whether this is a directory or a file.
1451	* @param fRelaxed Whether we can be more relaxed about this
1452	* directory (only used for grand parent
1453	* directories).
1454	* @param fSymlinksAllowed Flag whether symlinks are allowed or not.
1455	* If allowed the symlink object is verified not the target.
1456	* @param pszPath The path to the object. For error messages and
1457	* securing a couple of hacks.
1458	* @param pErrInfo The error info structure.
1459	*/
1460	static int supR3HardenedVerifyFsObject(PCSUPR3HARDENEDFSOBJSTATE pFsObjState, bool fDir, bool fRelaxed,
1461	bool fSymlinksAllowed, const char *pszPath, PRTERRINFO pErrInfo)
1462	{
1463	#if defined(RT_OS_WINDOWS)
1464	/** @todo Windows hardening. */
1465	RT_NOREF(pFsObjState, fDir, fRelaxed, fSymlinksAllowed, pszPath, pErrInfo);
1466	return VINF_SUCCESS;
1467
1468	#elif defined(RT_OS_OS2)
1469	/* No hardening here - it's a single user system. */
1470	RT_NOREF(pFsObjState, fDir, fRelaxed, fSymlinksAllowed, pszPath, pErrInfo);
1471	return VINF_SUCCESS;
1472
1473	#else
1474	/*
1475	* The owner must be root.
1476	*
1477	* This can be extended to include predefined system users if necessary.
1478	*/
1479	if (pFsObjState->Stat.st_uid != 0)
1480	return supR3HardenedSetError3(VERR_SUPLIB_OWNER_NOT_ROOT, pErrInfo, "The owner is not root: '", pszPath, "'");
1481
1482	/*
1483	* The object type must be directory or file. It can be a symbolic link
1484	* if explicitely allowed. Otherwise this and other risky stuff is not allowed
1485	* (sorry dude, but we're paranoid on purpose here).
1486	*/
1487	if ( !S_ISLNK(pFsObjState->Stat.st_mode)
1488	\|\| !fSymlinksAllowed)
1489	{
1490
1491	if ( !S_ISDIR(pFsObjState->Stat.st_mode)
1492	&& !S_ISREG(pFsObjState->Stat.st_mode))
1493	{
1494	if (S_ISLNK(pFsObjState->Stat.st_mode))
1495	return supR3HardenedSetError3(VERR_SUPLIB_SYMLINKS_ARE_NOT_PERMITTED, pErrInfo,
1496	"Symlinks are not permitted: '", pszPath, "'");
1497	return supR3HardenedSetError3(VERR_SUPLIB_NOT_DIR_NOT_FILE, pErrInfo,
1498	"Not regular file or directory: '", pszPath, "'");
1499	}
1500	if (fDir != !!S_ISDIR(pFsObjState->Stat.st_mode))
1501	{
1502	if (S_ISDIR(pFsObjState->Stat.st_mode))
1503	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
1504	"Expected file but found directory: '", pszPath, "'");
1505	return supR3HardenedSetError3(VERR_SUPLIB_IS_FILE, pErrInfo,
1506	"Expected directory but found file: '", pszPath, "'");
1507	}
1508	}
1509
1510	/*
1511	* The group does not matter if it does not have write access, if it has
1512	* write access it must be group 0 (root/wheel/whatever).
1513	*
1514	* This can be extended to include predefined system groups or groups that
1515	* only root is member of.
1516	*/
1517	if ( (pFsObjState->Stat.st_mode & S_IWGRP)
1518	&& pFsObjState->Stat.st_gid != 0)
1519	{
1520	# ifdef RT_OS_DARWIN
1521	/* HACK ALERT: On Darwin /Applications is root:admin with admin having
1522	full access. So, to work around we relax the hardening a bit and
1523	permit grand parents and beyond to be group writable by admin. */
1524	/** @todo dynamically resolve the admin group? */
1525	bool fBad = !fRelaxed \|\| pFsObjState->Stat.st_gid != 80 /admin/ \|\| suplibHardenedStrCmp(pszPath, "/Applications");
1526
1527	# elif defined(RT_OS_FREEBSD)
1528	/* HACK ALERT: PC-BSD 9 has group-writable /usr/pib directory which is
1529	similar to /Applications on OS X (see above).
1530	On FreeBSD root is normally the only member of this group, on
1531	PC-BSD the default user is a member. */
1532	/** @todo dynamically resolve the operator group? */
1533	bool fBad = !fRelaxed \|\| pFsObjState->Stat.st_gid != 5 /operator/ \|\| suplibHardenedStrCmp(pszPath, "/usr/pbi");
1534	NOREF(fRelaxed);
1535	# elif defined(RT_OS_SOLARIS)
1536	/* HACK ALERT: Solaris has group-writable /usr/lib/iconv directory from
1537	which the appropriate module is loaded.
1538	By default only root and daemon are part of that group.
1539	. */
1540	/** @todo dynamically resolve the bin group? */
1541	bool fBad = !fRelaxed \|\| pFsObjState->Stat.st_gid != 2 /bin/ \|\| suplibHardenedStrCmp(pszPath, "/usr/lib/iconv");
1542	# else
1543	NOREF(fRelaxed);
1544	bool fBad = true;
1545	# endif
1546	if (fBad)
1547	return supR3HardenedSetError3(VERR_SUPLIB_WRITE_NON_SYS_GROUP, pErrInfo,
1548	"An unknown (and thus untrusted) group has write access to '", pszPath,
1549	"' and we therefore cannot trust the directory content or that of any subdirectory");
1550	}
1551
1552	/*
1553	* World must not have write access. There is no relaxing this rule.
1554	* Linux exception: Symbolic links are always give permission 0777, there
1555	* is no lchmod or lchown APIs. The permissions on parent
1556	* directory that contains the symbolic link is what is
1557	* decising wrt to modifying it. (Caller is expected not
1558	* to allow symbolic links in the first path component.)
1559	*/
1560	if ( (pFsObjState->Stat.st_mode & S_IWOTH)
1561	# ifdef RT_OS_LINUX
1562	&& ( !S_ISLNK(pFsObjState->Stat.st_mode)
1563	\|\| !fSymlinksAllowed /* paranoia */)
1564	# endif
1565	)
1566	return supR3HardenedSetError3(VERR_SUPLIB_WORLD_WRITABLE, pErrInfo,
1567	"World writable: '", pszPath, "'");
1568
1569	/*
1570	* Check the ACLs.
1571	*/
1572	/** @todo */
1573
1574	return VINF_SUCCESS;
1575	#endif
1576	}
1577
1578
1579	/**
1580	* Verifies that the file system object indicated by the native handle is the
1581	* same as the one @a pFsObjState indicates.
1582	*
1583	* @returns VBox status code, error buffer filled on failure.
1584	* @param hNative The native handle to the object @a pszPath
1585	* specifies and this should be verified to be the
1586	* same file system object.
1587	* @param pFsObjState The information/state returned by a previous
1588	* query call.
1589	* @param pszPath The path to the object @a pFsObjState
1590	* describes. (For the error message.)
1591	* @param pErrInfo The error info structure.
1592	*/
1593	static int supR3HardenedVerifySameFsObject(RTHCUINTPTR hNative, PCSUPR3HARDENEDFSOBJSTATE pFsObjState,
1594	const char *pszPath, PRTERRINFO pErrInfo)
1595	{
1596	SUPR3HARDENEDFSOBJSTATE FsObjState2;
1597	int rc = supR3HardenedQueryFsObjectByHandle(hNative, &FsObjState2, pszPath, pErrInfo);
1598	if (RT_SUCCESS(rc))
1599	rc = supR3HardenedIsSameFsObject(pFsObjState, &FsObjState2, pszPath, pErrInfo);
1600	return rc;
1601	}
1602
1603
1604	/**
1605	* Does the recursive directory enumeration.
1606	*
1607	* @returns VBox status code, error buffer filled on failure.
1608	* @param pszDirPath The path buffer containing the subdirectory to
1609	* enumerate followed by a slash (this is never
1610	* the root slash). The buffer is RTPATH_MAX in
1611	* size and anything starting at @a cchDirPath
1612	* - 1 and beyond is scratch space.
1613	* @param cchDirPath The length of the directory path + slash.
1614	* @param pFsObjState Pointer to the file system object state buffer.
1615	* On input this will hold the stats for
1616	* the directory @a pszDirPath indicates and will
1617	* be used to verified that we're opening the same
1618	* thing.
1619	* @param fRecursive Whether to recurse into subdirectories.
1620	* @param pErrInfo The error info structure.
1621	*/
1622	static int supR3HardenedVerifyDirRecursive(char *pszDirPath, size_t cchDirPath, PSUPR3HARDENEDFSOBJSTATE pFsObjState,
1623	bool fRecursive, PRTERRINFO pErrInfo)
1624	{
1625	#if defined(RT_OS_WINDOWS)
1626	/** @todo Windows hardening. */
1627	RT_NOREF5(pszDirPath, cchDirPath, pFsObjState, fRecursive, pErrInfo);
1628	return VINF_SUCCESS;
1629
1630	#elif defined(RT_OS_OS2)
1631	/* No hardening here - it's a single user system. */
1632	RT_NOREF5(pszDirPath, cchDirPath, pFsObjState, fRecursive, pErrInfo);
1633	return VINF_SUCCESS;
1634
1635	#else
1636	/*
1637	* Open the directory. Now, we could probably eliminate opendir here
1638	* and go down on kernel API level (open + getdents for instance), however
1639	* that's not very portable and hopefully not necessary.
1640	*/
1641	DIR *pDir = opendir(pszDirPath);
1642	if (!pDir)
1643	{
1644	/* Ignore access errors. */
1645	if (errno == EACCES)
1646	return VINF_SUCCESS;
1647	return supR3HardenedSetErrorN(VERR_SUPLIB_DIR_ENUM_FAILED, pErrInfo,
1648	5, "opendir failed with ", strerror(errno), " on '", pszDirPath, "'");
1649	}
1650	if (dirfd(pDir) != -1)
1651	{
1652	int rc = supR3HardenedVerifySameFsObject(dirfd(pDir), pFsObjState, pszDirPath, pErrInfo);
1653	if (RT_FAILURE(rc))
1654	{
1655	closedir(pDir);
1656	return rc;
1657	}
1658	}
1659
1660	/*
1661	* Enumerate the directory, check all the requested bits.
1662	*/
1663	int rc = VINF_SUCCESS;
1664	for (;;)
1665	{
1666	pszDirPath[cchDirPath] = '\0'; /* for error messages. */
1667
1668	struct dirent Entry;
1669	struct dirent *pEntry;
1670	#if RT_GNUC_PREREQ(4, 6)
1671	# pragma GCC diagnostic push
1672	# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
1673	#endif
1674	int iErr = readdir_r(pDir, &Entry, &pEntry);
1675	#if RT_GNUC_PREREQ(4, 6)
1676	# pragma GCC diagnostic pop
1677	#endif
1678	if (iErr)
1679	{
1680	rc = supR3HardenedSetErrorN(VERR_SUPLIB_DIR_ENUM_FAILED, pErrInfo,
1681	5, "readdir_r failed with ", strerror(iErr), " in '", pszDirPath, "'");
1682	break;
1683	}
1684	if (!pEntry)
1685	break;
1686
1687	/*
1688	* Check the length and copy it into the path buffer so it can be
1689	* stat()'ed.
1690	*/
1691	size_t cchName = suplibHardenedStrLen(pEntry->d_name);
1692	if (cchName + cchDirPath > SUPR3HARDENED_MAX_PATH)
1693	{
1694	rc = supR3HardenedSetErrorN(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo,
1695	4, "Path grew too long during recursion: '", pszDirPath, pEntry->d_name, "'");
1696	break;
1697	}
1698	suplibHardenedMemCopy(&pszDirPath[cchDirPath], pEntry->d_name, cchName + 1);
1699
1700	/*
1701	* Query the information about the entry and verify it.
1702	* (We don't bother skipping '.' and '..' at this point, a little bit
1703	* of extra checks doesn't hurt and neither requires relaxed handling.)
1704	*/
1705	rc = supR3HardenedQueryFsObjectByPath(pszDirPath, pFsObjState, pErrInfo);
1706	if (RT_SUCCESS(rc))
1707	break;
1708	rc = supR3HardenedVerifyFsObject(pFsObjState, S_ISDIR(pFsObjState->Stat.st_mode), false /fRelaxed/,
1709	false /fSymlinksAllowed/, pszDirPath, pErrInfo);
1710	if (RT_FAILURE(rc))
1711	break;
1712
1713	/*
1714	* Recurse into subdirectories if requested.
1715	*/
1716	if ( fRecursive
1717	&& S_ISDIR(pFsObjState->Stat.st_mode)
1718	&& suplibHardenedStrCmp(pEntry->d_name, ".")
1719	&& suplibHardenedStrCmp(pEntry->d_name, ".."))
1720	{
1721	pszDirPath[cchDirPath + cchName] = RTPATH_SLASH;
1722	pszDirPath[cchDirPath + cchName + 1] = '\0';
1723
1724	rc = supR3HardenedVerifyDirRecursive(pszDirPath, cchDirPath + cchName + 1, pFsObjState,
1725	fRecursive, pErrInfo);
1726	if (RT_FAILURE(rc))
1727	break;
1728	}
1729	}
1730
1731	closedir(pDir);
1732	return rc;
1733	#endif
1734	}
1735
1736
1737	/**
1738	* Worker for SUPR3HardenedVerifyDir.
1739	*
1740	* @returns See SUPR3HardenedVerifyDir.
1741	* @param pszDirPath See SUPR3HardenedVerifyDir.
1742	* @param fRecursive See SUPR3HardenedVerifyDir.
1743	* @param fCheckFiles See SUPR3HardenedVerifyDir.
1744	* @param pErrInfo See SUPR3HardenedVerifyDir.
1745	*/
1746	DECLHIDDEN(int) supR3HardenedVerifyDir(const char *pszDirPath, bool fRecursive, bool fCheckFiles, PRTERRINFO pErrInfo)
1747	{
1748	/*
1749	* Validate the input path and parse it.
1750	*/
1751	SUPR3HARDENEDPATHINFO Info;
1752	int rc = supR3HardenedVerifyPathSanity(pszDirPath, pErrInfo, &Info);
1753	if (RT_FAILURE(rc))
1754	return rc;
1755
1756	/*
1757	* Verify each component from the root up.
1758	*/
1759	SUPR3HARDENEDFSOBJSTATE FsObjState;
1760	uint32_t const cComponents = Info.cComponents;
1761	for (uint32_t iComponent = 0; iComponent < cComponents; iComponent++)
1762	{
1763	bool fRelaxed = iComponent + 2 < cComponents;
1764	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = '\0';
1765	rc = supR3HardenedQueryFsObjectByPath(Info.szPath, &FsObjState, pErrInfo);
1766	if (RT_SUCCESS(rc))
1767	rc = supR3HardenedVerifyFsObject(&FsObjState, true /fDir/, fRelaxed,
1768	false /fSymlinksAllowed/, Info.szPath, pErrInfo);
1769	if (RT_FAILURE(rc))
1770	return rc;
1771	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = iComponent + 1 != cComponents ? RTPATH_SLASH : '\0';
1772	}
1773
1774	/*
1775	* Check files and subdirectories if requested.
1776	*/
1777	if (fCheckFiles \|\| fRecursive)
1778	{
1779	Info.szPath[Info.cch] = RTPATH_SLASH;
1780	Info.szPath[Info.cch + 1] = '\0';
1781	return supR3HardenedVerifyDirRecursive(Info.szPath, Info.cch + 1, &FsObjState,
1782	fRecursive, pErrInfo);
1783	}
1784
1785	return VINF_SUCCESS;
1786	}
1787
1788
1789	/**
1790	* Verfies a file.
1791	*
1792	* @returns VBox status code, error buffer filled on failure.
1793	* @param pszFilename The file to verify.
1794	* @param hNativeFile Handle to the file, verify that it's the same
1795	* as we ended up with when verifying the path.
1796	* RTHCUINTPTR_MAX means NIL here.
1797	* @param fMaybe3rdParty Set if the file is could be a supplied by a
1798	* third party. Different validation rules may
1799	* apply to 3rd party code on some platforms.
1800	* @param pErrInfo Where to return extended error information.
1801	* Optional.
1802	*/
1803	DECLHIDDEN(int) supR3HardenedVerifyFile(const char *pszFilename, RTHCUINTPTR hNativeFile,
1804	bool fMaybe3rdParty, PRTERRINFO pErrInfo)
1805	{
1806	/*
1807	* Validate the input path and parse it.
1808	*/
1809	SUPR3HARDENEDPATHINFO Info;
1810	int rc = supR3HardenedVerifyPathSanity(pszFilename, pErrInfo, &Info);
1811	if (RT_FAILURE(rc))
1812	return rc;
1813	if (Info.fDirSlash)
1814	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
1815	"The file path specifies a directory: '", pszFilename, "'");
1816
1817	/*
1818	* Verify each component from the root up.
1819	*/
1820	SUPR3HARDENEDFSOBJSTATE FsObjState;
1821	uint32_t const cComponents = Info.cComponents;
1822	for (uint32_t iComponent = 0; iComponent < cComponents; iComponent++)
1823	{
1824	bool fFinal = iComponent + 1 == cComponents;
1825	bool fRelaxed = iComponent + 2 < cComponents;
1826	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = '\0';
1827	rc = supR3HardenedQueryFsObjectByPath(Info.szPath, &FsObjState, pErrInfo);
1828	if (RT_SUCCESS(rc))
1829	rc = supR3HardenedVerifyFsObject(&FsObjState, !fFinal /fDir/, fRelaxed,
1830	false /fSymlinksAllowed/, Info.szPath, pErrInfo);
1831	if (RT_FAILURE(rc))
1832	return rc;
1833	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = !fFinal ? RTPATH_SLASH : '\0';
1834	}
1835
1836	/*
1837	* Verify the file handle against the last component, if specified.
1838	*/
1839	if (hNativeFile != RTHCUINTPTR_MAX)
1840	{
1841	rc = supR3HardenedVerifySameFsObject(hNativeFile, &FsObjState, Info.szPath, pErrInfo);
1842	if (RT_FAILURE(rc))
1843	return rc;
1844	}
1845
1846	#ifdef RT_OS_WINDOWS
1847	/*
1848	* The files shall be signed on windows, verify that.
1849	*/
1850	rc = VINF_SUCCESS;
1851	HANDLE hVerify;
1852	if (hNativeFile == RTHCUINTPTR_MAX)
1853	{
1854	PRTUTF16 pwszPath;
1855	rc = RTStrToUtf16(pszFilename, &pwszPath);
1856	if (RT_SUCCESS(rc))
1857	{
1858	hVerify = CreateFileW(pwszPath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
1859	RTUtf16Free(pwszPath);
1860	}
1861	else
1862	{
1863	rc = RTErrInfoSetF(pErrInfo, rc, "Error converting '%s' to UTF-16: %Rrc", pszFilename, rc);
1864	hVerify = INVALID_HANDLE_VALUE;
1865	}
1866	}
1867	else
1868	{
1869	NTSTATUS rcNt = NtDuplicateObject(NtCurrentProcess(), (HANDLE)hNativeFile, NtCurrentProcess(), &hVerify,
1870	GENERIC_READ, 0 /HandleAttributes/, 0 /Options/);
1871	if (!NT_SUCCESS(rcNt))
1872	hVerify = INVALID_HANDLE_VALUE;
1873	}
1874	if (hVerify != INVALID_HANDLE_VALUE)
1875	{
1876	# ifdef VBOX_WITH_HARDENING
1877	uint32_t fFlags = SUPHNTVI_F_REQUIRE_KERNEL_CODE_SIGNING;
1878	if (!fMaybe3rdParty)
1879	fFlags = SUPHNTVI_F_REQUIRE_BUILD_CERT;
1880	const char *pszSuffix = RTPathSuffix(pszFilename);
1881	if ( pszSuffix
1882	&& pszSuffix[0] == '.'
1883	&& ( RT_C_TO_LOWER(pszSuffix[1]) == 'r'
1884	\|\| RT_C_TO_LOWER(pszSuffix[1]) == 'g')
1885	&& RT_C_TO_LOWER(pszSuffix[2]) == 'c'
1886	&& pszSuffix[3] == '\0' )
1887	fFlags \|= SUPHNTVI_F_RC_IMAGE;
1888	# ifndef IN_SUP_R3_STATIC /* Not in VBoxCpuReport and friends. */
1889	rc = supHardenedWinVerifyImageByHandleNoName(hVerify, fFlags, pErrInfo);
1890	# endif
1891	# else
1892	RT_NOREF1(fMaybe3rdParty);
1893	# endif
1894	NtClose(hVerify);
1895	}
1896	else if (RT_SUCCESS(rc))
1897	rc = RTErrInfoSetF(pErrInfo, RTErrConvertFromWin32(RtlGetLastWin32Error()),
1898	"Error %u trying to open (or duplicate handle for) '%s'", RtlGetLastWin32Error(), pszFilename);
1899	if (RT_FAILURE(rc))
1900	return rc;
1901	#else
1902	RT_NOREF1(fMaybe3rdParty);
1903	#endif
1904
1905	return VINF_SUCCESS;
1906	}
1907
1908
1909	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_LINUX)
1910	/**
1911	* Verfies a file following symlinks.
1912	*
1913	* @returns VBox status code, error buffer filled on failure.
1914	* @param pszFilename The file to verify.
1915	* @param hNativeFile Handle to the file, verify that it's the same
1916	* as we ended up with when verifying the path.
1917	* RTHCUINTPTR_MAX means NIL here.
1918	* @param fMaybe3rdParty Set if the file is could be a supplied by a
1919	* third party. Different validation rules may
1920	* apply to 3rd party code on some platforms.
1921	* @param pErrInfo Where to return extended error information.
1922	* Optional.
1923	*
1924	* @note This is only used on OS X for libraries loaded with dlopen() because
1925	* the frameworks use symbolic links to point to the relevant library.
1926	*
1927	* @sa supR3HardenedVerifyFile
1928	*/
1929	DECLHIDDEN(int) supR3HardenedVerifyFileFollowSymlinks(const char *pszFilename, RTHCUINTPTR hNativeFile, bool fMaybe3rdParty,
1930	PRTERRINFO pErrInfo)
1931	{
1932	RT_NOREF1(fMaybe3rdParty);
1933
1934	/*
1935	* Validate the input path and parse it.
1936	*/
1937	SUPR3HARDENEDPATHINFO Info;
1938	int rc = supR3HardenedVerifyPathSanity(pszFilename, pErrInfo, &Info);
1939	if (RT_FAILURE(rc))
1940	return rc;
1941	if (Info.fDirSlash)
1942	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
1943	"The file path specifies a directory: '", pszFilename, "'");
1944
1945	/*
1946	* Verify each component from the root up.
1947	*/
1948	#ifndef SUP_HARDENED_VERIFY_FOLLOW_SYMLINKS_USE_REALPATH
1949	uint32_t iLoops = 0;
1950	#endif
1951	SUPR3HARDENEDFSOBJSTATE FsObjState;
1952	uint32_t iComponent = 0;
1953	while (iComponent < Info.cComponents)
1954	{
1955	bool fFinal = iComponent + 1 == Info.cComponents;
1956	bool fRelaxed = iComponent + 2 < Info.cComponents;
1957	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = '\0';
1958	rc = supR3HardenedQueryFsObjectByPath(Info.szPath, &FsObjState, pErrInfo);
1959	if (RT_SUCCESS(rc))
1960	{
1961	/*
1962	* In case the component is a symlink expand it and start from the beginning after
1963	* verifying it has the proper access rights.
1964	* Furthermore only allow symlinks which don't contain any .. or . in the target
1965	* (enforced by supR3HardenedVerifyPathSanity).
1966	*/
1967	rc = supR3HardenedVerifyFsObject(&FsObjState, !fFinal /fDir/, fRelaxed,
1968	true /fSymlinksAllowed/, Info.szPath, pErrInfo);
1969	if ( RT_SUCCESS(rc)
1970	&& S_ISLNK(FsObjState.Stat.st_mode))
1971	{
1972	#if SUP_HARDENED_VERIFY_FOLLOW_SYMLINKS_USE_REALPATH /* Another approach using realpath() and verifying the result when encountering a symlink. */
1973	char *pszFilenameResolved = realpath(pszFilename, NULL);
1974	if (pszFilenameResolved)
1975	{
1976	rc = supR3HardenedVerifyFile(pszFilenameResolved, hNativeFile, fMaybe3rdParty, pErrInfo);
1977	free(pszFilenameResolved);
1978	return rc;
1979	}
1980	else
1981	{
1982	int iErr = errno;
1983	supR3HardenedError(VERR_ACCESS_DENIED, false /fFatal/,
1984	"supR3HardenedVerifyFileFollowSymlinks: Failed to resolve the real path '%s': %s (%d)\n",
1985	pszFilename, strerror(iErr), iErr);
1986	return supR3HardenedSetError4(VERR_ACCESS_DENIED, pErrInfo,
1987	"realpath failed for '", pszFilename, "': ", strerror(iErr));
1988	}
1989	#else
1990	/* Don't loop forever. */
1991	iLoops++;
1992	if (iLoops < 8)
1993	{
1994	/*
1995	* Construct new path by replacing the current component by the symlink value.
1996	* Note! readlink() is a weird API that doesn't necessarily indicates if the
1997	* buffer is too small.
1998	*/
1999	char szPath[RTPATH_MAX];
2000	size_t const cchBefore = Info.aoffComponents[iComponent]; /* includes slash */
2001	size_t const cchAfter = fFinal ? 0 : 1 /slash/ + Info.cch - Info.aoffComponents[iComponent + 1];
2002	if (sizeof(szPath) > cchBefore + cchAfter + 2)
2003	{
2004	ssize_t cchTarget = readlink(Info.szPath, szPath, sizeof(szPath) - 1);
2005	if (cchTarget > 0)
2006	{
2007	/* Some serious paranoia against embedded zero terminator and weird return values. */
2008	szPath[cchTarget] = '\0';
2009	size_t cchLink = strlen(szPath);
2010
2011	/* Strip trailing dirslashes of non-final link. */
2012	if (!fFinal)
2013	while (cchLink > 1 and szPath[cchLink - 1] == '/')
2014	cchLink--;
2015
2016	/* Check link value sanity and buffer size. */
2017	if (cchLink == 0)
2018	return supR3HardenedSetError3(VERR_ACCESS_DENIED, pErrInfo,
2019	"Bad readlink return for '", Info.szPath, "'");
2020	if (szPath[0] == '/')
2021	return supR3HardenedSetError3(VERR_ACCESS_DENIED, pErrInfo,
2022	"Absolute symbolic link not allowed: '", szPath, "'");
2023	if (cchBefore + cchLink + cchAfter + 1 /terminator/ > sizeof(szPath))
2024	return supR3HardenedSetError(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo,
2025	"Symlinks causing too long path!");
2026
2027	/* Construct the new path. */
2028	if (cchBefore)
2029	memmove(&szPath[cchBefore], &szPath[0], cchLink);
2030	memcpy(&szPath[0], Info.szPath, cchBefore);
2031	if (!cchAfter)
2032	szPath[cchBefore + cchLink] = '\0';
2033	else
2034	{
2035	szPath[cchBefore + cchLink] = RTPATH_SLASH;
2036	memcpy(&szPath[cchBefore + cchLink + 1],
2037	&Info.szPath[Info.aoffComponents[iComponent + 1]],
2038	cchAfter); /* cchAfter includes a zero terminator */
2039	}
2040
2041	/* Parse, copy and check the sanity (no '..' or '.') of the altered path. */
2042	rc = supR3HardenedVerifyPathSanity(szPath, pErrInfo, &Info);
2043	if (RT_FAILURE(rc))
2044	return rc;
2045	if (Info.fDirSlash)
2046	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
2047	"The file path specifies a directory: '", szPath, "'");
2048
2049	/* Restart from the current component. */
2050	continue;
2051	}
2052	int iErr = errno;
2053	supR3HardenedError(VERR_ACCESS_DENIED, false /fFatal/,
2054	"supR3HardenedVerifyFileFollowSymlinks: Failed to readlink '%s': %s (%d)\n",
2055	Info.szPath, strerror(iErr), iErr);
2056	return supR3HardenedSetError4(VERR_ACCESS_DENIED, pErrInfo,
2057	"readlink failed for '", Info.szPath, "': ", strerror(iErr));
2058	}
2059	return supR3HardenedSetError(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo, "Path too long for symlink replacing!");
2060	}
2061	else
2062	return supR3HardenedSetError3(VERR_TOO_MANY_SYMLINKS, pErrInfo,
2063	"Too many symbolic links: '", pszFilename, "'");
2064	#endif
2065	}
2066	}
2067	if (RT_FAILURE(rc))
2068	return rc;
2069	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = !fFinal ? RTPATH_SLASH : '\0';
2070	iComponent++;
2071	}
2072
2073	/*
2074	* Verify the file handle against the last component, if specified.
2075	*/
2076	if (hNativeFile != RTHCUINTPTR_MAX)
2077	{
2078	rc = supR3HardenedVerifySameFsObject(hNativeFile, &FsObjState, Info.szPath, pErrInfo);
2079	if (RT_FAILURE(rc))
2080	return rc;
2081	}
2082
2083	return VINF_SUCCESS;
2084	}
2085	#endif /* RT_OS_DARWIN \|\| RT_OS_LINUX */
2086
2087
2088	/**
2089	* Gets the pre-init data for the hand-over to the other version
2090	* of this code.
2091	*
2092	* The reason why we pass this information on is that it contains
2093	* open directories and files. Later it may include even more info
2094	* (int the verified arrays mostly).
2095	*
2096	* The receiver is supR3HardenedRecvPreInitData.
2097	*
2098	* @param pPreInitData Where to store it.
2099	*/
2100	DECLHIDDEN(void) supR3HardenedGetPreInitData(PSUPPREINITDATA pPreInitData)
2101	{
2102	pPreInitData->cInstallFiles = RT_ELEMENTS(g_aSupInstallFiles);
2103	pPreInitData->paInstallFiles = &g_aSupInstallFiles[0];
2104	pPreInitData->paVerifiedFiles = &g_aSupVerifiedFiles[0];
2105
2106	pPreInitData->cVerifiedDirs = RT_ELEMENTS(g_aSupVerifiedDirs);
2107	pPreInitData->paVerifiedDirs = &g_aSupVerifiedDirs[0];
2108	}
2109
2110
2111	/**
2112	* Receives the pre-init data from the static executable stub.
2113	*
2114	* @returns VBox status code. Will not bitch on failure since the
2115	* runtime isn't ready for it, so that is left to the exe stub.
2116	*
2117	* @param pPreInitData The hand-over data.
2118	*/
2119	DECLHIDDEN(int) supR3HardenedRecvPreInitData(PCSUPPREINITDATA pPreInitData)
2120	{
2121	/*
2122	* Compare the array lengths and the contents of g_aSupInstallFiles.
2123	*/
2124	if ( pPreInitData->cInstallFiles != RT_ELEMENTS(g_aSupInstallFiles)
2125	\|\| pPreInitData->cVerifiedDirs != RT_ELEMENTS(g_aSupVerifiedDirs))
2126	return VERR_VERSION_MISMATCH;
2127	SUPINSTFILE const *paInstallFiles = pPreInitData->paInstallFiles;
2128	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
2129	if ( g_aSupInstallFiles[iFile].enmDir != paInstallFiles[iFile].enmDir
2130	\|\| g_aSupInstallFiles[iFile].enmType != paInstallFiles[iFile].enmType
2131	\|\| g_aSupInstallFiles[iFile].fOptional != paInstallFiles[iFile].fOptional
2132	\|\| suplibHardenedStrCmp(g_aSupInstallFiles[iFile].pszFile, paInstallFiles[iFile].pszFile))
2133	return VERR_VERSION_MISMATCH;
2134
2135	/*
2136	* Check that we're not called out of order.
2137	* If dynamic linking it screwed up, we may end up here.
2138	*/
2139	if ( !ASMMemIsZero(&g_aSupVerifiedFiles[0], sizeof(g_aSupVerifiedFiles))
2140	\|\| !ASMMemIsZero(&g_aSupVerifiedDirs[0], sizeof(g_aSupVerifiedDirs)))
2141	return VERR_WRONG_ORDER;
2142
2143	/*
2144	* Copy the verification data over.
2145	*/
2146	suplibHardenedMemCopy(&g_aSupVerifiedFiles[0], pPreInitData->paVerifiedFiles, sizeof(g_aSupVerifiedFiles));
2147	suplibHardenedMemCopy(&g_aSupVerifiedDirs[0], pPreInitData->paVerifiedDirs, sizeof(g_aSupVerifiedDirs));
2148	return VINF_SUCCESS;
2149	}

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source: vbox/trunk/src/VBox/HostDrivers/Support/SUPR3HardenedVerify.cpp@ 98103

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