SUPR3HardenedVerify.cpp@ 52355

最後變更在這個檔案從52355是 52355,由 vboxsync 提交於 11 年前
SUPR3HardenedVerify.cpp: Corrected CreateFileW result check (NULL vs INVALID_HANDLE_VALUE).
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1	/* $Id: SUPR3HardenedVerify.cpp 52355 2014-08-11 19:21:58Z vboxsync $ */
2	/** @file
3	* VirtualBox Support Library - Verification of Hardened Installation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.alldomusa.eu.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27	/*******************************************************************************
28	* Header Files *
29	*******************************************************************************/
30	#if defined(RT_OS_OS2)
31	# define INCL_BASE
32	# define INCL_ERRORS
33	# include <os2.h>
34	# include <stdio.h>
35	# include <stdlib.h>
36	# include <unistd.h>
37	# include <sys/fcntl.h>
38	# include <sys/errno.h>
39	# include <sys/syslimits.h>
40
41	#elif defined(RT_OS_WINDOWS)
42	# include <iprt/nt/nt-and-windows.h>
43	# ifndef IN_SUP_HARDENED_R3
44	# include <stdio.h>
45	# endif
46
47	#else /* UNIXes */
48	# include <sys/types.h>
49	# include <stdio.h>
50	# include <stdlib.h>
51	# include <dirent.h>
52	# include <dlfcn.h>
53	# include <fcntl.h>
54	# include <limits.h>
55	# include <errno.h>
56	# include <unistd.h>
57	# include <sys/stat.h>
58	# include <sys/time.h>
59	# include <sys/fcntl.h>
60	# include <pwd.h>
61	# ifdef RT_OS_DARWIN
62	# include <mach-o/dyld.h>
63	# endif
64
65	#endif
66
67	#include <VBox/sup.h>
68	#include <VBox/err.h>
69	#include <iprt/asm.h>
70	#include <iprt/ctype.h>
71	#include <iprt/param.h>
72	#include <iprt/path.h>
73	#include <iprt/string.h>
74
75	#include "SUPLibInternal.h"
76	#if defined(RT_OS_WINDOWS) && defined(VBOX_WITH_HARDENING)
77	# define SUPHNTVI_NO_NT_STUFF
78	# include "win/SUPHardenedVerify-win.h"
79	#endif
80
81
82	/*******************************************************************************
83	* Defined Constants And Macros *
84	*******************************************************************************/
85	/** The max path length acceptable for a trusted path. */
86	#define SUPR3HARDENED_MAX_PATH 260U
87
88	#ifdef RT_OS_SOLARIS
89	# define dirfd(d) ((d)->d_fd)
90	#endif
91
92	/** Compare table file names with externally supplied names. */
93	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
94	# define SUP_COMP_FILENAME RTStrICmp
95	#else
96	# define SUP_COMP_FILENAME suplibHardenedStrCmp
97	#endif
98
99
100	/*******************************************************************************
101	* Global Variables *
102	*******************************************************************************/
103	/**
104	* The files that gets verified.
105	*
106	* @todo This needs reviewing against the linux packages.
107	* @todo The excessive use of kSupID_SharedLib needs to be reviewed at some point. For
108	* the time being we're building the linux packages with SharedLib pointing to
109	* AppPrivArch (lazy bird).
110	*/
111	static SUPINSTFILE const g_aSupInstallFiles[] =
112	{
113	/* type, dir, fOpt, "pszFile" */
114	/* ---------------------------------------------------------------------- */
115	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VMMR0.r0" },
116	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDDR0.r0" },
117	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDD2R0.r0" },
118
119	#ifdef VBOX_WITH_RAW_MODE
120	{ kSupIFT_Rc, kSupID_AppPrivArch, false, "VMMGC.gc" },
121	{ kSupIFT_Rc, kSupID_AppPrivArch, false, "VBoxDDGC.gc" },
122	{ kSupIFT_Rc, kSupID_AppPrivArch, false, "VBoxDD2GC.gc" },
123	#endif
124
125	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxRT" SUPLIB_DLL_SUFF },
126	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxVMM" SUPLIB_DLL_SUFF },
127	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxREM" SUPLIB_DLL_SUFF },
128	#if HC_ARCH_BITS == 32
129	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxREM32" SUPLIB_DLL_SUFF },
130	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxREM64" SUPLIB_DLL_SUFF },
131	#endif
132	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDD" SUPLIB_DLL_SUFF },
133	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDD2" SUPLIB_DLL_SUFF },
134	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDDU" SUPLIB_DLL_SUFF },
135
136	//#ifdef VBOX_WITH_DEBUGGER_GUI
137	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxDbg" SUPLIB_DLL_SUFF },
138	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxDbg3" SUPLIB_DLL_SUFF },
139	//#endif
140
141	//#ifdef VBOX_WITH_SHARED_CLIPBOARD
142	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedClipboard" SUPLIB_DLL_SUFF },
143	//#endif
144	//#ifdef VBOX_WITH_SHARED_FOLDERS
145	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedFolders" SUPLIB_DLL_SUFF },
146	//#endif
147	//#ifdef VBOX_WITH_DRAG_AND_DROP
148	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxDragAndDropSvc" SUPLIB_DLL_SUFF },
149	//#endif
150	//#ifdef VBOX_WITH_GUEST_PROPS
151	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxGuestPropSvc" SUPLIB_DLL_SUFF },
152	//#endif
153	//#ifdef VBOX_WITH_GUEST_CONTROL
154	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxGuestControlSvc" SUPLIB_DLL_SUFF },
155	//#endif
156	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxHostChannel" SUPLIB_DLL_SUFF },
157	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedCrOpenGL" SUPLIB_DLL_SUFF },
158	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhostcrutil" SUPLIB_DLL_SUFF },
159	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhosterrorspu" SUPLIB_DLL_SUFF },
160	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLrenderspu" SUPLIB_DLL_SUFF },
161
162	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxManage" SUPLIB_EXE_SUFF },
163
164	#ifdef VBOX_WITH_MAIN
165	{ kSupIFT_Exe, kSupID_AppBin, false, "VBoxSVC" SUPLIB_EXE_SUFF },
166	#ifdef RT_OS_WINDOWS
167	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxC" SUPLIB_DLL_SUFF },
168	#else
169	{ kSupIFT_Exe, kSupID_AppPrivArch, false, "VBoxXPCOMIPCD" SUPLIB_EXE_SUFF },
170	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxXPCOM" SUPLIB_DLL_SUFF },
171	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxXPCOMIPCC" SUPLIB_DLL_SUFF },
172	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxC" SUPLIB_DLL_SUFF },
173	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxSVCM" SUPLIB_DLL_SUFF },
174	{ kSupIFT_Data, kSupID_AppPrivArchComp, false, "VBoxXPCOMBase.xpt" },
175	#endif
176	#endif
177
178	{ kSupIFT_Dll, kSupID_SharedLib, true, "VRDPAuth" SUPLIB_DLL_SUFF },
179	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxAuth" SUPLIB_DLL_SUFF },
180	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxVRDP" SUPLIB_DLL_SUFF },
181
182	//#ifdef VBOX_WITH_HEADLESS
183	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxHeadless" SUPLIB_EXE_SUFF },
184	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxHeadless" SUPLIB_DLL_SUFF },
185	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxVideoRecFB" SUPLIB_DLL_SUFF },
186	//#endif
187
188	//#ifdef VBOX_WITH_QTGUI
189	{ kSupIFT_Exe, kSupID_AppBin, true, "VirtualBox" SUPLIB_EXE_SUFF },
190	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VirtualBox" SUPLIB_DLL_SUFF },
191	# if !defined(RT_OS_DARWIN) && !defined(RT_OS_WINDOWS) && !defined(RT_OS_OS2)
192	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxKeyboard" SUPLIB_DLL_SUFF },
193	# endif
194	//#endif
195
196	//#ifdef VBOX_WITH_VBOXSDL
197	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxSDL" SUPLIB_EXE_SUFF },
198	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSDL" SUPLIB_DLL_SUFF },
199	//#endif
200
201	//#ifdef VBOX_WITH_WEBSERVICES
202	{ kSupIFT_Exe, kSupID_AppBin, true, "vboxwebsrv" SUPLIB_EXE_SUFF },
203	//#endif
204
205	#ifdef RT_OS_LINUX
206	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxTunctl" SUPLIB_EXE_SUFF },
207	#endif
208
209	//#ifdef VBOX_WITH_NETFLT
210	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxNetDHCP" SUPLIB_EXE_SUFF },
211	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxNetDHCP" SUPLIB_DLL_SUFF },
212	//#endif
213
214	//#ifdef VBOX_WITH_LWIP_NAT
215	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxNetNAT" SUPLIB_EXE_SUFF },
216	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxNetNAT" SUPLIB_DLL_SUFF },
217	//#endif
218	#if defined(VBOX_WITH_HARDENING) && defined(RT_OS_WINDOWS)
219	# define HARDENED_TESTCASE_BIN_ENTRY(a_szName) \
220	{ kSupIFT_TestExe, kSupID_AppBin, true, a_szName SUPLIB_EXE_SUFF }, \
221	{ kSupIFT_TestDll, kSupID_AppBin, true, a_szName SUPLIB_DLL_SUFF }
222	HARDENED_TESTCASE_BIN_ENTRY("tstMicro"),
223	HARDENED_TESTCASE_BIN_ENTRY("tstPDMAsyncCompletion"),
224	HARDENED_TESTCASE_BIN_ENTRY("tstPDMAsyncCompletionStress"),
225	HARDENED_TESTCASE_BIN_ENTRY("tstVMM"),
226	HARDENED_TESTCASE_BIN_ENTRY("tstVMREQ"),
227	# define HARDENED_TESTCASE_ENTRY(a_szName) \
228	{ kSupIFT_TestExe, kSupID_Testcase, true, a_szName SUPLIB_EXE_SUFF }, \
229	{ kSupIFT_TestDll, kSupID_Testcase, true, a_szName SUPLIB_DLL_SUFF }
230	HARDENED_TESTCASE_ENTRY("tstCFGM"),
231	HARDENED_TESTCASE_ENTRY("tstIntNet-1"),
232	HARDENED_TESTCASE_ENTRY("tstMMHyperHeap"),
233	HARDENED_TESTCASE_ENTRY("tstR0ThreadPreemptionDriver"),
234	HARDENED_TESTCASE_ENTRY("tstRTR0MemUserKernelDriver"),
235	HARDENED_TESTCASE_ENTRY("tstRTR0SemMutexDriver"),
236	HARDENED_TESTCASE_ENTRY("tstRTR0TimerDriver"),
237	HARDENED_TESTCASE_ENTRY("tstSSM"),
238	#endif
239	};
240
241
242	/** Array parallel to g_aSupInstallFiles containing per-file status info. */
243	static SUPVERIFIEDFILE g_aSupVerifiedFiles[RT_ELEMENTS(g_aSupInstallFiles)];
244
245	/** Array index by install directory specifier containing info about verified directories. */
246	static SUPVERIFIEDDIR g_aSupVerifiedDirs[kSupID_End];
247
248
249	/**
250	* Assembles the path to a directory.
251	*
252	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
253	* decides whether it returns or not).
254	*
255	* @param enmDir The directory.
256	* @param pszDst Where to assemble the path.
257	* @param cchDst The size of the buffer.
258	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
259	*/
260	static int supR3HardenedMakePath(SUPINSTDIR enmDir, char *pszDst, size_t cchDst, bool fFatal)
261	{
262	int rc;
263	switch (enmDir)
264	{
265	case kSupID_AppBin: /** @todo fix this AppBin crap (uncertain wtf some binaries actually are installed). */
266	case kSupID_Bin:
267	rc = supR3HardenedPathExecDir(pszDst, cchDst);
268	break;
269	case kSupID_SharedLib:
270	rc = supR3HardenedPathSharedLibs(pszDst, cchDst);
271	break;
272	case kSupID_AppPrivArch:
273	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
274	break;
275	case kSupID_AppPrivArchComp:
276	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
277	if (RT_SUCCESS(rc))
278	{
279	size_t off = suplibHardenedStrLen(pszDst);
280	if (cchDst - off >= sizeof("/components"))
281	suplibHardenedMemCopy(&pszDst[off], "/components", sizeof("/components"));
282	else
283	rc = VERR_BUFFER_OVERFLOW;
284	}
285	break;
286	case kSupID_AppPrivNoArch:
287	rc = supR3HardenedPathAppPrivateNoArch(pszDst, cchDst);
288	break;
289	case kSupID_Testcase:
290	rc = supR3HardenedPathExecDir(pszDst, cchDst);
291	if (RT_SUCCESS(rc))
292	{
293	size_t off = suplibHardenedStrLen(pszDst);
294	if (cchDst - off >= sizeof("/testcase"))
295	suplibHardenedMemCopy(&pszDst[off], "/testcase", sizeof("/testcase"));
296	else
297	rc = VERR_BUFFER_OVERFLOW;
298	}
299	break;
300	default:
301	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
302	"supR3HardenedMakePath: enmDir=%d\n", enmDir);
303	}
304	if (RT_FAILURE(rc))
305	supR3HardenedError(rc, fFatal,
306	"supR3HardenedMakePath: enmDir=%d rc=%d\n", enmDir, rc);
307	return rc;
308	}
309
310
311
312	/**
313	* Assembles the path to a file table entry, with or without the actual filename.
314	*
315	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
316	* decides whether it returns or not).
317	*
318	* @param pFile The file table entry.
319	* @param pszDst Where to assemble the path.
320	* @param cchDst The size of the buffer.
321	* @param fWithFilename If set, the filename is included, otherwise it is omitted (no trailing slash).
322	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
323	*/
324	static int supR3HardenedMakeFilePath(PCSUPINSTFILE pFile, char *pszDst, size_t cchDst, bool fWithFilename, bool fFatal)
325	{
326	/*
327	* Combine supR3HardenedMakePath and the filename.
328	*/
329	int rc = supR3HardenedMakePath(pFile->enmDir, pszDst, cchDst, fFatal);
330	if (RT_SUCCESS(rc) && fWithFilename)
331	{
332	size_t cchFile = suplibHardenedStrLen(pFile->pszFile);
333	size_t off = suplibHardenedStrLen(pszDst);
334	if (cchDst - off >= cchFile + 2)
335	{
336	pszDst[off++] = '/';
337	suplibHardenedMemCopy(&pszDst[off], pFile->pszFile, cchFile + 1);
338	}
339	else
340	rc = supR3HardenedError(VERR_BUFFER_OVERFLOW, fFatal,
341	"supR3HardenedMakeFilePath: pszFile=%s off=%lu\n",
342	pFile->pszFile, (long)off);
343	}
344	return rc;
345	}
346
347
348	/**
349	* Verifies a directory.
350	*
351	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
352	* fFatal is clear and if it's set the function wont return.
353	* @param enmDir The directory specifier.
354	* @param fFatal Whether validation failures should be treated as
355	* fatal (true) or not (false).
356	*/
357	DECLHIDDEN(int) supR3HardenedVerifyFixedDir(SUPINSTDIR enmDir, bool fFatal)
358	{
359	/*
360	* Validate the index just to be on the safe side...
361	*/
362	if (enmDir <= kSupID_Invalid \|\| enmDir >= kSupID_End)
363	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
364	"supR3HardenedVerifyDir: enmDir=%d\n", enmDir);
365
366	/*
367	* Already validated?
368	*/
369	if (g_aSupVerifiedDirs[enmDir].fValidated)
370	return VINF_SUCCESS; /** @todo revalidate? */
371
372	/* initialize the entry. */
373	if (g_aSupVerifiedDirs[enmDir].hDir != 0)
374	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
375	"supR3HardenedVerifyDir: hDir=%p enmDir=%d\n",
376	(void *)g_aSupVerifiedDirs[enmDir].hDir, enmDir);
377	g_aSupVerifiedDirs[enmDir].hDir = -1;
378	g_aSupVerifiedDirs[enmDir].fValidated = false;
379
380	/*
381	* Make the path and open the directory.
382	*/
383	char szPath[RTPATH_MAX];
384	int rc = supR3HardenedMakePath(enmDir, szPath, sizeof(szPath), fFatal);
385	if (RT_SUCCESS(rc))
386	{
387	#if defined(RT_OS_WINDOWS)
388	PRTUTF16 pwszPath;
389	rc = RTStrToUtf16(szPath, &pwszPath);
390	if (RT_SUCCESS(rc))
391	{
392	HANDLE hDir = CreateFileW(pwszPath,
393	GENERIC_READ,
394	FILE_SHARE_READ \| FILE_SHARE_DELETE \| FILE_SHARE_WRITE,
395	NULL,
396	OPEN_EXISTING,
397	FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_BACKUP_SEMANTICS,
398	NULL);
399	if (hDir != INVALID_HANDLE_VALUE)
400	{
401	/** @todo check the type */
402	/* That's all on windows, for now at least... */
403	g_aSupVerifiedDirs[enmDir].hDir = (intptr_t)hDir;
404	g_aSupVerifiedDirs[enmDir].fValidated = true;
405	}
406	else if (enmDir == kSupID_Testcase)
407	{
408	g_aSupVerifiedDirs[enmDir].fValidated = true;
409	rc = VINF_SUCCESS; /* Optional directory, ignore if missing. */
410	}
411	else
412	{
413	int err = GetLastError();
414	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
415	"supR3HardenedVerifyDir: Failed to open \"%s\": err=%d\n",
416	szPath, err);
417	}
418	RTUtf16Free(pwszPath);
419	}
420	else
421	rc = supR3HardenedError(rc, fFatal,
422	"supR3HardenedVerifyDir: Failed to convert \"%s\" to UTF-16: err=%d\n", szPath, rc);
423
424	#else /* UNIXY */
425	int fd = open(szPath, O_RDONLY, 0);
426	if (fd >= 0)
427	{
428	/*
429	* On unixy systems we'll make sure the directory is owned by root
430	* and not writable by the group and user.
431	*/
432	struct stat st;
433	if (!fstat(fd, &st))
434	{
435
436	if ( st.st_uid == 0
437	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
438	&& S_ISDIR(st.st_mode))
439	{
440	g_aSupVerifiedDirs[enmDir].hDir = fd;
441	g_aSupVerifiedDirs[enmDir].fValidated = true;
442	}
443	else
444	{
445	if (!S_ISDIR(st.st_mode))
446	rc = supR3HardenedError(VERR_NOT_A_DIRECTORY, fFatal,
447	"supR3HardenedVerifyDir: \"%s\" is not a directory\n",
448	szPath, (long)st.st_uid);
449	else if (st.st_uid)
450	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
451	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": not owned by root (st_uid=%ld)\n",
452	szPath, (long)st.st_uid);
453	else
454	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
455	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": group and/or other writable (st_mode=0%lo)\n",
456	szPath, (long)st.st_mode);
457	close(fd);
458	}
459	}
460	else
461	{
462	int err = errno;
463	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
464	"supR3HardenedVerifyDir: Failed to fstat \"%s\": %s (%d)\n",
465	szPath, strerror(err), err);
466	close(fd);
467	}
468	}
469	else if (enmDir == kSupID_Testcase)
470	{
471	g_aSupVerifiedDirs[enmDir].fValidated = true;
472	rc = VINF_SUCCESS; /* Optional directory, ignore if missing. */
473	}
474	else
475	{
476	int err = errno;
477	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
478	"supR3HardenedVerifyDir: Failed to open \"%s\": %s (%d)\n",
479	szPath, strerror(err), err);
480	}
481	#endif /* UNIXY */
482	}
483
484	return rc;
485	}
486
487
488	#ifdef RT_OS_WINDOWS
489	/**
490	* Opens the file for verification.
491	*
492	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
493	* fFatal is clear and if it's set the function wont return.
494	* @param pFile The file entry.
495	* @param fFatal Whether validation failures should be treated as
496	* kl fatal (true) or not (false).
497	* @param phFile The file handle, set to -1 if we failed to open
498	* the file. The function may return VINF_SUCCESS
499	* and a -1 handle if the file is optional.
500	*/
501	static int supR3HardenedVerifyFileOpen(PCSUPINSTFILE pFile, bool fFatal, intptr_t *phFile)
502	{
503	*phFile = -1;
504
505	char szPath[RTPATH_MAX];
506	int rc = supR3HardenedMakeFilePath(pFile, szPath, sizeof(szPath), true /fWithFilename/, fFatal);
507	if (RT_SUCCESS(rc))
508	{
509	PRTUTF16 pwszPath;
510	rc = RTStrToUtf16(szPath, &pwszPath);
511	if (RT_SUCCESS(rc))
512	{
513	HANDLE hFile = CreateFileW(pwszPath,
514	GENERIC_READ,
515	FILE_SHARE_READ,
516	NULL,
517	OPEN_EXISTING,
518	FILE_ATTRIBUTE_NORMAL,
519	NULL);
520	if (hFile != INVALID_HANDLE_VALUE)
521	{
522	*phFile = (intptr_t)hFile;
523	rc = VINF_SUCCESS;
524	}
525	else
526	{
527	int err = GetLastError();
528	if ( !pFile->fOptional
529	\|\| ( err != ERROR_FILE_NOT_FOUND
530	&& (err != ERROR_PATH_NOT_FOUND \|\| pFile->enmDir != kSupID_Testcase) ) )
531	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
532	"supR3HardenedVerifyFileInternal: Failed to open '%s': err=%d\n", szPath, err);
533	}
534	RTUtf16Free(pwszPath);
535	}
536	else
537	rc = supR3HardenedError(rc, fFatal, "supR3HardenedVerifyFileInternal: Failed to convert '%s' to UTF-16: %Rrc\n",
538	szPath, rc);
539	}
540	return rc;
541	}
542
543
544	/**
545	* Worker for supR3HardenedVerifyFileInternal.
546	*
547	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
548	* fFatal is clear and if it's set the function wont return.
549	* @param pFile The file entry.
550	* @param pVerified The verification record.
551	* @param fFatal Whether validation failures should be treated as
552	* fatal (true) or not (false).
553	* @param fLeaveFileOpen Whether the file should be left open.
554	*/
555	static int supR3HardenedVerifyFileSignature(PCSUPINSTFILE pFile, PSUPVERIFIEDFILE pVerified, bool fFatal, bool fLeaveFileOpen)
556	{
557	# if defined(VBOX_WITH_HARDENING) && !defined(IN_SUP_R3_STATIC) /* Latter: Not in VBoxCpuReport and friends. */
558
559	/*
560	* Open the file if we have to.
561	*/
562	int rc;
563	intptr_t hFileOpened;
564	intptr_t hFile = pVerified->hFile;
565	if (hFile != -1)
566	hFileOpened = -1;
567	else
568	{
569	rc = supR3HardenedVerifyFileOpen(pFile, fFatal, &hFileOpened);
570	if (RT_FAILURE(rc))
571	return rc;
572	hFile = hFileOpened;
573	}
574
575	/*
576	* Verify the signature.
577	*/
578	char szErr[1024];
579	RTERRINFO ErrInfo;
580	RTErrInfoInit(&ErrInfo, szErr, sizeof(szErr));
581
582	uint32_t fFlags = SUPHNTVI_F_REQUIRE_BUILD_CERT;
583	if (pFile->enmType == kSupIFT_Rc)
584	fFlags \|= SUPHNTVI_F_RC_IMAGE;
585
586	rc = supHardenedWinVerifyImageByHandleNoName((HANDLE)hFile, fFlags, &ErrInfo);
587	if (RT_SUCCESS(rc))
588	pVerified->fCheckedSignature = true;
589	else
590	{
591	pVerified->fCheckedSignature = false;
592	rc = supR3HardenedError(rc, fFatal, "supR3HardenedVerifyFileInternal: '%s': Image verify error rc=%Rrc: %s\n",
593	pFile->pszFile, rc, szErr);
594
595	}
596
597	/*
598	* Close the handle if we opened the file and we should close it.
599	*/
600	if (hFileOpened != -1)
601	{
602	if (fLeaveFileOpen && RT_SUCCESS(rc))
603	pVerified->hFile = hFileOpened;
604	else
605	CloseHandle((HANDLE)hFileOpened);
606	}
607
608	return rc;
609
610	# else /* Not checking signatures. */
611	return VINF_SUCCESS;
612	# endif /* Not checking signatures. */
613	}
614	#endif
615
616
617	/**
618	* Verifies a file entry.
619	*
620	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
621	* fFatal is clear and if it's set the function wont return.
622	*
623	* @param iFile The file table index of the file to be verified.
624	* @param fFatal Whether validation failures should be treated as
625	* fatal (true) or not (false).
626	* @param fLeaveFileOpen Whether the file should be left open.
627	* @param fVerifyAll Set if this is an verify all call and we will
628	* postpone signature checking.
629	*/
630	static int supR3HardenedVerifyFileInternal(int iFile, bool fFatal, bool fLeaveFileOpen, bool fVerifyAll)
631	{
632	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
633	PSUPVERIFIEDFILE pVerified = &g_aSupVerifiedFiles[iFile];
634
635	/*
636	* Already done validation? Do signature validation if we haven't yet.
637	*/
638	if (pVerified->fValidated)
639	{
640	/** @todo revalidate? Check that the file hasn't been replace or similar. */
641	#ifdef RT_OS_WINDOWS
642	if (!pVerified->fCheckedSignature && !fVerifyAll)
643	return supR3HardenedVerifyFileSignature(pFile, pVerified, fFatal, fLeaveFileOpen);
644	#endif
645	return VINF_SUCCESS;
646	}
647
648
649	/* initialize the entry. */
650	if (pVerified->hFile != 0)
651	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
652	"supR3HardenedVerifyFileInternal: hFile=%p (%s)\n",
653	(void *)pVerified->hFile, pFile->pszFile);
654	pVerified->hFile = -1;
655	pVerified->fValidated = false;
656	#ifdef RT_OS_WINDOWS
657	pVerified->fCheckedSignature = false;
658	#endif
659
660	/*
661	* Verify the directory then proceed to open it.
662	* (This'll make sure the directory is opened and that we can (later)
663	* use openat if we wish.)
664	*/
665	int rc = supR3HardenedVerifyFixedDir(pFile->enmDir, fFatal);
666	if (RT_SUCCESS(rc))
667	{
668	#if defined(RT_OS_WINDOWS)
669	rc = supR3HardenedVerifyFileOpen(pFile, fFatal, &pVerified->hFile);
670	if (RT_SUCCESS(rc))
671	{
672	if (!fVerifyAll)
673	rc = supR3HardenedVerifyFileSignature(pFile, pVerified, fFatal, fLeaveFileOpen);
674	if (RT_SUCCESS(rc))
675	{
676	pVerified->fValidated = true;
677	if (!fLeaveFileOpen)
678	{
679	CloseHandle((HANDLE)pVerified->hFile);
680	pVerified->hFile = -1;
681	}
682	}
683	}
684	#else /* !RT_OS_WINDOWS */
685	char szPath[RTPATH_MAX];
686	rc = supR3HardenedMakeFilePath(pFile, szPath, sizeof(szPath), true /fWithFilename/, fFatal);
687	if (RT_SUCCESS(rc))
688	{
689	int fd = open(szPath, O_RDONLY, 0);
690	if (fd >= 0)
691	{
692	/*
693	* On unixy systems we'll make sure the file is owned by root
694	* and not writable by the group and user.
695	*/
696	struct stat st;
697	if (!fstat(fd, &st))
698	{
699	if ( st.st_uid == 0
700	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
701	&& S_ISREG(st.st_mode))
702	{
703	/* it's valid. */
704	if (fLeaveFileOpen)
705	pVerified->hFile = fd;
706	else
707	close(fd);
708	pVerified->fValidated = true;
709	}
710	else
711	{
712	if (!S_ISREG(st.st_mode))
713	rc = supR3HardenedError(VERR_IS_A_DIRECTORY, fFatal,
714	"supR3HardenedVerifyFileInternal: \"%s\" is not a regular file\n",
715	szPath, (long)st.st_uid);
716	else if (st.st_uid)
717	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
718	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%s\": not owned by root (st_uid=%ld)\n",
719	szPath, (long)st.st_uid);
720	else
721	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
722	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%s\": group and/or other writable (st_mode=0%lo)\n",
723	szPath, (long)st.st_mode);
724	close(fd);
725	}
726	}
727	else
728	{
729	int err = errno;
730	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
731	"supR3HardenedVerifyFileInternal: Failed to fstat \"%s\": %s (%d)\n",
732	szPath, strerror(err), err);
733	close(fd);
734	}
735	}
736	else
737	{
738	int err = errno;
739	if (!pFile->fOptional \|\| err != ENOENT)
740	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
741	"supR3HardenedVerifyFileInternal: Failed to open \"%s\": %s (%d)\n",
742	szPath, strerror(err), err);
743	}
744	}
745	#endif /* !RT_OS_WINDOWS */
746	}
747
748	return rc;
749	}
750
751
752	/**
753	* Verifies that the specified table entry matches the given filename.
754	*
755	* @returns VINF_SUCCESS if matching. On mismatch fFatal indicates whether an
756	* error is returned or we terminate the application.
757	*
758	* @param iFile The file table index.
759	* @param pszFilename The filename.
760	* @param fFatal Whether validation failures should be treated as
761	* fatal (true) or not (false).
762	*/
763	static int supR3HardenedVerifySameFile(int iFile, const char *pszFilename, bool fFatal)
764	{
765	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
766
767	/*
768	* Construct the full path for the file table entry
769	* and compare it with the specified file.
770	*/
771	char szName[RTPATH_MAX];
772	int rc = supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
773	if (RT_FAILURE(rc))
774	return rc;
775	if (SUP_COMP_FILENAME(szName, pszFilename))
776	{
777	/*
778	* Normalize the two paths and compare again.
779	*/
780	rc = VERR_NOT_SAME_DEVICE;
781	#if defined(RT_OS_WINDOWS)
782	LPSTR pszIgnored;
783	char szName2[RTPATH_MAX]; /** @todo Must use UTF-16 here! Code is mixing UTF-8 and native. */
784	if ( GetFullPathName(szName, RT_ELEMENTS(szName2), &szName2[0], &pszIgnored)
785	&& GetFullPathName(pszFilename, RT_ELEMENTS(szName), &szName[0], &pszIgnored))
786	if (!SUP_COMP_FILENAME(szName2, szName))
787	rc = VINF_SUCCESS;
788	#else
789	AssertCompile(RTPATH_MAX >= PATH_MAX);
790	char szName2[RTPATH_MAX];
791	if ( realpath(szName, szName2) != NULL
792	&& realpath(pszFilename, szName) != NULL)
793	if (!SUP_COMP_FILENAME(szName2, szName))
794	rc = VINF_SUCCESS;
795	#endif
796
797	if (RT_FAILURE(rc))
798	{
799	supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
800	return supR3HardenedError(rc, fFatal,
801	"supR3HardenedVerifySameFile: \"%s\" isn't the same as \"%s\"\n",
802	pszFilename, szName);
803	}
804	}
805
806	/*
807	* Check more stuff like the stat info if it's an already open file?
808	*/
809
810
811
812	return VINF_SUCCESS;
813	}
814
815
816	/**
817	* Verifies a file.
818	*
819	* @returns VINF_SUCCESS on success.
820	* VERR_NOT_FOUND if the file isn't in the table, this isn't ever a fatal error.
821	* On verification failure, an error code will be returned when fFatal is clear,
822	* otherwise the program will be terminated.
823	*
824	* @param pszFilename The filename.
825	* @param fFatal Whether validation failures should be treated as
826	* fatal (true) or not (false).
827	*/
828	DECLHIDDEN(int) supR3HardenedVerifyFixedFile(const char *pszFilename, bool fFatal)
829	{
830	/*
831	* Lookup the file and check if it's the same file.
832	*/
833	const char *pszName = supR3HardenedPathFilename(pszFilename);
834	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
835	if (!SUP_COMP_FILENAME(pszName, g_aSupInstallFiles[iFile].pszFile))
836	{
837	int rc = supR3HardenedVerifySameFile(iFile, pszFilename, fFatal);
838	if (RT_SUCCESS(rc))
839	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, false /* fLeaveFileOpen /, false / fVerifyAll */);
840	return rc;
841	}
842
843	return VERR_NOT_FOUND;
844	}
845
846
847	/**
848	* Verifies a program, worker for supR3HardenedVerifyAll.
849	*
850	* @returns See supR3HardenedVerifyAll.
851	* @param pszProgName See supR3HardenedVerifyAll.
852	* @param fFatal See supR3HardenedVerifyAll.
853	* @param fLeaveOpen The leave open setting used by
854	* supR3HardenedVerifyAll.
855	*/
856	static int supR3HardenedVerifyProgram(const char *pszProgName, bool fFatal, bool fLeaveOpen)
857	{
858	/*
859	* Search the table looking for the executable and the DLL/DYLIB/SO.
860	*/
861	int rc = VINF_SUCCESS;
862	bool fExe = false;
863	bool fDll = false;
864	size_t const cchProgName = suplibHardenedStrLen(pszProgName);
865	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
866	if (!suplibHardenedStrNCmp(pszProgName, g_aSupInstallFiles[iFile].pszFile, cchProgName))
867	{
868	if ( ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Dll
869	\|\| g_aSupInstallFiles[iFile].enmType == kSupIFT_TestDll)
870	&& !suplibHardenedStrCmp(&g_aSupInstallFiles[iFile].pszFile[cchProgName], SUPLIB_DLL_SUFF))
871	{
872	/* This only has to be found (once). */
873	if (fDll)
874	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
875	"supR3HardenedVerifyProgram: duplicate DLL entry for \"%s\"\n", pszProgName);
876	else
877	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen, false /* fVerifyAll */);
878	fDll = true;
879	}
880	else if ( ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Exe
881	\|\| g_aSupInstallFiles[iFile].enmType == kSupIFT_TestExe)
882	&& !suplibHardenedStrCmp(&g_aSupInstallFiles[iFile].pszFile[cchProgName], SUPLIB_EXE_SUFF))
883	{
884	/* Here we'll have to check that the specific program is the same as the entry. */
885	if (fExe)
886	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
887	"supR3HardenedVerifyProgram: duplicate EXE entry for \"%s\"\n", pszProgName);
888	else
889	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen, false /* fVerifyAll */);
890	fExe = true;
891
892	char szFilename[RTPATH_MAX];
893	int rc2 = supR3HardenedPathExecDir(szFilename, sizeof(szFilename) - cchProgName - sizeof(SUPLIB_EXE_SUFF));
894	if (RT_SUCCESS(rc2))
895	{
896	suplibHardenedStrCat(szFilename, "/");
897	suplibHardenedStrCat(szFilename, g_aSupInstallFiles[iFile].pszFile);
898	supR3HardenedVerifySameFile(iFile, szFilename, fFatal);
899	}
900	else
901	rc = supR3HardenedError(rc2, fFatal,
902	"supR3HardenedVerifyProgram: failed to query program path: rc=%d\n", rc2);
903	}
904	}
905
906	/*
907	* Check the findings.
908	*/
909	if (RT_SUCCESS(rc))
910	{
911	if (!fDll && !fExe)
912	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
913	"supR3HardenedVerifyProgram: Couldn't find the program \"%s\"\n", pszProgName);
914	else if (!fExe)
915	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
916	"supR3HardenedVerifyProgram: Couldn't find the EXE entry for \"%s\"\n", pszProgName);
917	else if (!fDll)
918	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
919	"supR3HardenedVerifyProgram: Couldn't find the DLL entry for \"%s\"\n", pszProgName);
920	}
921	return rc;
922	}
923
924
925	/**
926	* Verifies all the known files (called from SUPR3HardenedMain).
927	*
928	* @returns VINF_SUCCESS on success.
929	* On verification failure, an error code will be returned when fFatal is clear,
930	* otherwise the program will be terminated.
931	*
932	* @param fFatal Whether validation failures should be treated as
933	* fatal (true) or not (false).
934	* @param pszProgName The program name. This is used to verify that
935	* both the executable and corresponding
936	* DLL/DYLIB/SO are valid.
937	*/
938	DECLHIDDEN(int) supR3HardenedVerifyAll(bool fFatal, const char *pszProgName)
939	{
940	/*
941	* On windows
942	*/
943	#if defined(RT_OS_WINDOWS)
944	bool fLeaveOpen = true;
945	#else
946	bool fLeaveOpen = false;
947	#endif
948
949	/*
950	* The verify all the files.
951	*/
952	int rc = VINF_SUCCESS;
953	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
954	{
955	int rc2 = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveOpen, true /* fVerifyAll */);
956	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
957	rc = rc2;
958	}
959
960	/*
961	* Verify the program name, that is to say, check that it's in the table
962	* (thus verified above) and verify the signature on platforms where we
963	* sign things.
964	*/
965	int rc2 = supR3HardenedVerifyProgram(pszProgName, fFatal, fLeaveOpen);
966	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
967	rc2 = rc;
968
969	return rc;
970	}
971
972
973	/**
974	* Copies the N messages into the error buffer and returns @a rc.
975	*
976	* @returns Returns @a rc
977	* @param rc The return code.
978	* @param pErrInfo The error info structure.
979	* @param cMsgs The number of messages in the ellipsis.
980	* @param ... Message parts.
981	*/
982	static int supR3HardenedSetErrorN(int rc, PRTERRINFO pErrInfo, unsigned cMsgs, ...)
983	{
984	if (pErrInfo)
985	{
986	size_t cbErr = pErrInfo->cbMsg;
987	char *pszErr = pErrInfo->pszMsg;
988
989	va_list va;
990	va_start(va, cMsgs);
991	while (cMsgs-- > 0 && cbErr > 0)
992	{
993	const char pszMsg = va_arg(va, const char );
994	size_t cchMsg = VALID_PTR(pszMsg) ? suplibHardenedStrLen(pszMsg) : 0;
995	if (cchMsg >= cbErr)
996	cchMsg = cbErr - 1;
997	suplibHardenedMemCopy(pszErr, pszMsg, cchMsg);
998	pszErr[cchMsg] = '\0';
999	pszErr += cchMsg;
1000	cbErr -= cchMsg;
1001	}
1002	va_end(va);
1003
1004	pErrInfo->rc = rc;
1005	pErrInfo->fFlags \|= RTERRINFO_FLAGS_SET;
1006	}
1007
1008	return rc;
1009	}
1010
1011
1012	/**
1013	* Copies the three messages into the error buffer and returns @a rc.
1014	*
1015	* @returns Returns @a rc
1016	* @param rc The return code.
1017	* @param pErrInfo The error info structure.
1018	* @param pszMsg1 The first message part.
1019	* @param pszMsg2 The second message part.
1020	* @param pszMsg3 The third message part.
1021	*/
1022	static int supR3HardenedSetError3(int rc, PRTERRINFO pErrInfo, const char *pszMsg1,
1023	const char pszMsg2, const char pszMsg3)
1024	{
1025	return supR3HardenedSetErrorN(rc, pErrInfo, 3, pszMsg1, pszMsg2, pszMsg3);
1026	}
1027
1028	#ifdef SOME_UNUSED_FUNCTION
1029
1030	/**
1031	* Copies the two messages into the error buffer and returns @a rc.
1032	*
1033	* @returns Returns @a rc
1034	* @param rc The return code.
1035	* @param pErrInfo The error info structure.
1036	* @param pszMsg1 The first message part.
1037	* @param pszMsg2 The second message part.
1038	*/
1039	static int supR3HardenedSetError2(int rc, PRTERRINFO pErrInfo, const char *pszMsg1,
1040	const char *pszMsg2)
1041	{
1042	return supR3HardenedSetErrorN(rc, pErrInfo, 2, pszMsg1, pszMsg2);
1043	}
1044
1045
1046	/**
1047	* Copies the error message to the error buffer and returns @a rc.
1048	*
1049	* @returns Returns @a rc
1050	* @param rc The return code.
1051	* @param pErrInfo The error info structure.
1052	* @param pszMsg The message.
1053	*/
1054	static int supR3HardenedSetError(int rc, PRTERRINFO pErrInfo, const char *pszMsg)
1055	{
1056	return supR3HardenedSetErrorN(rc, pErrInfo, 1, pszMsg);
1057	}
1058
1059	#endif /* SOME_UNUSED_FUNCTION */
1060
1061	/**
1062	* Output from a successfull supR3HardenedVerifyPathSanity call.
1063	*/
1064	typedef struct SUPR3HARDENEDPATHINFO
1065	{
1066	/** The length of the path in szCopy. */
1067	uint16_t cch;
1068	/** The number of path components. */
1069	uint16_t cComponents;
1070	/** Set if the path ends with slash, indicating that it's a directory
1071	* reference and not a file reference. The slash has been removed from
1072	* the copy. */
1073	bool fDirSlash;
1074	/** The offset where each path component starts, i.e. the char after the
1075	* slash. The array has cComponents + 1 entries, where the final one is
1076	* cch + 1 so that one can always terminate the current component by
1077	* szPath[aoffComponent[i] - 1] = '\0'. */
1078	uint16_t aoffComponents[32+1];
1079	/** A normalized copy of the path.
1080	* Reserve some extra space so we can be more relaxed about overflow
1081	* checks and terminator paddings, especially when recursing. */
1082	char szPath[SUPR3HARDENED_MAX_PATH * 2];
1083	} SUPR3HARDENEDPATHINFO;
1084	/** Pointer to a parsed path. */
1085	typedef SUPR3HARDENEDPATHINFO *PSUPR3HARDENEDPATHINFO;
1086
1087
1088	/**
1089	* Verifies that the path is absolutely sane, it also parses the path.
1090	*
1091	* A sane path starts at the root (w/ drive letter on DOS derived systems) and
1092	* does not have any relative bits (/../) or unnecessary slashes (/bin//ls).
1093	* Sane paths are less or equal to SUPR3HARDENED_MAX_PATH bytes in length. UNC
1094	* paths are not supported.
1095	*
1096	* @returns VBox status code.
1097	* @param pszPath The path to check.
1098	* @param pErrInfo The error info structure.
1099	* @param pInfo Where to return a copy of the path along with
1100	* parsing information.
1101	*/
1102	static int supR3HardenedVerifyPathSanity(const char *pszPath, PRTERRINFO pErrInfo, PSUPR3HARDENEDPATHINFO pInfo)
1103	{
1104	const char *pszSrc = pszPath;
1105	char *pszDst = pInfo->szPath;
1106
1107	/*
1108	* Check that it's an absolute path and copy the volume/root specifier.
1109	*/
1110	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
1111	if ( !RT_C_IS_ALPHA(pszSrc[0])
1112	\|\| pszSrc[1] != ':'
1113	\|\| !RTPATH_IS_SLASH(pszSrc[2]))
1114	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo, "The path is not absolute: '", pszPath, "'");
1115
1116	*pszDst++ = RT_C_TO_UPPER(pszSrc[0]);
1117	*pszDst++ = ':';
1118	*pszDst++ = RTPATH_SLASH;
1119	pszSrc += 3;
1120
1121	#else
1122	if (!RTPATH_IS_SLASH(pszSrc[0]))
1123	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo, "The path is not absolute: '", pszPath, "'");
1124
1125	*pszDst++ = RTPATH_SLASH;
1126	pszSrc += 1;
1127	#endif
1128
1129	/*
1130	* No path specifying the root or something very shortly thereafter will
1131	* be approved of.
1132	*/
1133	if (pszSrc[0] == '\0')
1134	return supR3HardenedSetError3(VERR_SUPLIB_PATH_IS_ROOT, pErrInfo, "The path is root: '", pszPath, "'");
1135	if ( pszSrc[1] == '\0'
1136	\|\| pszSrc[2] == '\0')
1137	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_SHORT, pErrInfo, "The path is too short: '", pszPath, "'");
1138
1139	/*
1140	* Check each component. No parent references or double slashes.
1141	*/
1142	pInfo->cComponents = 0;
1143	pInfo->fDirSlash = false;
1144	while (pszSrc[0])
1145	{
1146	/* Sanity checks. */
1147	if (RTPATH_IS_SLASH(pszSrc[0])) /* can be relaxed if we care. */
1148	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_CLEAN, pErrInfo,
1149	"The path is not clean of double slashes: '", pszPath, "'");
1150	if ( pszSrc[0] == '.'
1151	&& pszSrc[1] == '.'
1152	&& RTPATH_IS_SLASH(pszSrc[2]))
1153	return supR3HardenedSetError3(VERR_SUPLIB_PATH_NOT_ABSOLUTE, pErrInfo,
1154	"The path is not absolute: '", pszPath, "'");
1155
1156	/* Record the start of the component. */
1157	if (pInfo->cComponents >= RT_ELEMENTS(pInfo->aoffComponents) - 1)
1158	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_MANY_COMPONENTS, pErrInfo,
1159	"The path has too many components: '", pszPath, "'");
1160	pInfo->aoffComponents[pInfo->cComponents++] = pszDst - &pInfo->szPath[0];
1161
1162	/* Traverse to the end of the component, copying it as we go along. */
1163	while (pszSrc[0])
1164	{
1165	if (RTPATH_IS_SLASH(pszSrc[0]))
1166	{
1167	pszSrc++;
1168	if (*pszSrc)
1169	*pszDst++ = RTPATH_SLASH;
1170	else
1171	pInfo->fDirSlash = true;
1172	break;
1173	}
1174	pszDst++ = pszSrc++;
1175	if ((uintptr_t)(pszDst - &pInfo->szPath[0]) >= SUPR3HARDENED_MAX_PATH)
1176	return supR3HardenedSetError3(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo,
1177	"The path is too long: '", pszPath, "'");
1178	}
1179	}
1180
1181	/* Terminate the string and enter its length. */
1182	pszDst[0] = '\0';
1183	pszDst[1] = '\0'; /* for aoffComponents */
1184	pInfo->cch = (uint16_t)(pszDst - &pInfo->szPath[0]);
1185	pInfo->aoffComponents[pInfo->cComponents] = pInfo->cch + 1;
1186
1187	return VINF_SUCCESS;
1188	}
1189
1190
1191	/**
1192	* The state information collected by supR3HardenedVerifyFsObject.
1193	*
1194	* This can be used to verify that a directory we've opened for enumeration is
1195	* the same as the one that supR3HardenedVerifyFsObject just verified. It can
1196	* equally be used to verify a native specfied by the user.
1197	*/
1198	typedef struct SUPR3HARDENEDFSOBJSTATE
1199	{
1200	#ifdef RT_OS_WINDOWS
1201	/** Not implemented for windows yet. */
1202	char chTodo;
1203	#else
1204	/** The stat output. */
1205	struct stat Stat;
1206	#endif
1207	} SUPR3HARDENEDFSOBJSTATE;
1208	/** Pointer to a file system object state. */
1209	typedef SUPR3HARDENEDFSOBJSTATE *PSUPR3HARDENEDFSOBJSTATE;
1210	/** Pointer to a const file system object state. */
1211	typedef SUPR3HARDENEDFSOBJSTATE const *PCSUPR3HARDENEDFSOBJSTATE;
1212
1213
1214	/**
1215	* Query information about a file system object by path.
1216	*
1217	* @returns VBox status code, error buffer filled on failure.
1218	* @param pszPath The path to the object.
1219	* @param pFsObjState Where to return the state information.
1220	* @param pErrInfo The error info structure.
1221	*/
1222	static int supR3HardenedQueryFsObjectByPath(char const *pszPath, PSUPR3HARDENEDFSOBJSTATE pFsObjState, PRTERRINFO pErrInfo)
1223	{
1224	#if defined(RT_OS_WINDOWS)
1225	/** @todo Windows hardening. */
1226	pFsObjState->chTodo = 0;
1227	return VINF_SUCCESS;
1228
1229	#else
1230	/*
1231	* Stat the object, do not follow links.
1232	*/
1233	if (lstat(pszPath, &pFsObjState->Stat) != 0)
1234	{
1235	/* Ignore access errors */
1236	if (errno != EACCES)
1237	return supR3HardenedSetErrorN(VERR_SUPLIB_STAT_FAILED, pErrInfo,
1238	5, "stat failed with ", strerror(errno), " on: '", pszPath, "'");
1239	}
1240
1241	/*
1242	* Read ACLs.
1243	*/
1244	/** @todo */
1245
1246	return VINF_SUCCESS;
1247	#endif
1248	}
1249
1250
1251	/**
1252	* Query information about a file system object by native handle.
1253	*
1254	* @returns VBox status code, error buffer filled on failure.
1255	* @param hNative The native handle to the object @a pszPath
1256	* specifies and this should be verified to be the
1257	* same file system object.
1258	* @param pFsObjState Where to return the state information.
1259	* @param pszPath The path to the object. (For the error message
1260	* only.)
1261	* @param pErrInfo The error info structure.
1262	*/
1263	static int supR3HardenedQueryFsObjectByHandle(RTHCUINTPTR hNative, PSUPR3HARDENEDFSOBJSTATE pFsObjState,
1264	char const *pszPath, PRTERRINFO pErrInfo)
1265	{
1266	#if defined(RT_OS_WINDOWS)
1267	/** @todo Windows hardening. */
1268	pFsObjState->chTodo = 0;
1269	return VINF_SUCCESS;
1270
1271	#else
1272	/*
1273	* Stat the object, do not follow links.
1274	*/
1275	if (fstat((int)hNative, &pFsObjState->Stat) != 0)
1276	return supR3HardenedSetErrorN(VERR_SUPLIB_STAT_FAILED, pErrInfo,
1277	5, "fstat failed with ", strerror(errno), " on '", pszPath, "'");
1278
1279	/*
1280	* Read ACLs.
1281	*/
1282	/** @todo */
1283
1284	return VINF_SUCCESS;
1285	#endif
1286	}
1287
1288
1289	/**
1290	* Verifies that the file system object indicated by the native handle is the
1291	* same as the one @a pFsObjState indicates.
1292	*
1293	* @returns VBox status code, error buffer filled on failure.
1294	* @param pFsObjState1 File system object information/state by path.
1295	* @param pFsObjState2 File system object information/state by handle.
1296	* @param pszPath The path to the object @a pFsObjState
1297	* describes. (For the error message.)
1298	* @param pErrInfo The error info structure.
1299	*/
1300	static int supR3HardenedIsSameFsObject(PCSUPR3HARDENEDFSOBJSTATE pFsObjState1, PCSUPR3HARDENEDFSOBJSTATE pFsObjState2,
1301	const char *pszPath, PRTERRINFO pErrInfo)
1302	{
1303	#if defined(RT_OS_WINDOWS)
1304	/** @todo Windows hardening. */
1305	return VINF_SUCCESS;
1306
1307	#elif defined(RT_OS_OS2)
1308	return VINF_SUCCESS;
1309
1310	#else
1311	/*
1312	* Compare the ino+dev, then the uid+gid and finally the important mode
1313	* bits. Technically the first one should be enough, but we're paranoid.
1314	*/
1315	if ( pFsObjState1->Stat.st_ino != pFsObjState2->Stat.st_ino
1316	\|\| pFsObjState1->Stat.st_dev != pFsObjState2->Stat.st_dev)
1317	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1318	"The native handle is not the same as '", pszPath, "' (ino/dev)");
1319	if ( pFsObjState1->Stat.st_uid != pFsObjState2->Stat.st_uid
1320	\|\| pFsObjState1->Stat.st_gid != pFsObjState2->Stat.st_gid)
1321	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1322	"The native handle is not the same as '", pszPath, "' (uid/gid)");
1323	if ( (pFsObjState1->Stat.st_mode & (S_IFMT \| S_IWUSR \| S_IWGRP \| S_IWOTH))
1324	!= (pFsObjState2->Stat.st_mode & (S_IFMT \| S_IWUSR \| S_IWGRP \| S_IWOTH)))
1325	return supR3HardenedSetError3(VERR_SUPLIB_NOT_SAME_OBJECT, pErrInfo,
1326	"The native handle is not the same as '", pszPath, "' (mode)");
1327	return VINF_SUCCESS;
1328	#endif
1329	}
1330
1331
1332	/**
1333	* Verifies a file system object (file or directory).
1334	*
1335	* @returns VBox status code, error buffer filled on failure.
1336	* @param pFsObjState The file system object information/state to be
1337	* verified.
1338	* @param fDir Whether this is a directory or a file.
1339	* @param fRelaxed Whether we can be more relaxed about this
1340	* directory (only used for grand parent
1341	* directories).
1342	* @param pszPath The path to the object. For error messages and
1343	* securing a couple of hacks.
1344	* @param pErrInfo The error info structure.
1345	*/
1346	static int supR3HardenedVerifyFsObject(PCSUPR3HARDENEDFSOBJSTATE pFsObjState, bool fDir, bool fRelaxed,
1347	const char *pszPath, PRTERRINFO pErrInfo)
1348	{
1349	#if defined(RT_OS_WINDOWS)
1350	/** @todo Windows hardening. */
1351	NOREF(pFsObjState); NOREF(fDir); NOREF(fRelaxed); NOREF(pszPath); NOREF(pErrInfo);
1352	return VINF_SUCCESS;
1353
1354	#elif defined(RT_OS_OS2)
1355	/* No hardening here - it's a single user system. */
1356	NOREF(pFsObjState); NOREF(fDir); NOREF(fRelaxed); NOREF(pszPath); NOREF(pErrInfo);
1357	return VINF_SUCCESS;
1358
1359	#else
1360	/*
1361	* The owner must be root.
1362	*
1363	* This can be extended to include predefined system users if necessary.
1364	*/
1365	if (pFsObjState->Stat.st_uid != 0)
1366	return supR3HardenedSetError3(VERR_SUPLIB_OWNER_NOT_ROOT, pErrInfo, "The owner is not root: '", pszPath, "'");
1367
1368	/*
1369	* The object type must be directory or file, no symbolic links or other
1370	* risky stuff (sorry dude, but we're paranoid on purpose here).
1371	*/
1372	if ( !S_ISDIR(pFsObjState->Stat.st_mode)
1373	&& !S_ISREG(pFsObjState->Stat.st_mode))
1374	{
1375	if (S_ISLNK(pFsObjState->Stat.st_mode))
1376	return supR3HardenedSetError3(VERR_SUPLIB_SYMLINKS_ARE_NOT_PERMITTED, pErrInfo,
1377	"Symlinks are not permitted: '", pszPath, "'");
1378	return supR3HardenedSetError3(VERR_SUPLIB_NOT_DIR_NOT_FILE, pErrInfo,
1379	"Not regular file or directory: '", pszPath, "'");
1380	}
1381	if (fDir != !!S_ISDIR(pFsObjState->Stat.st_mode))
1382	{
1383	if (S_ISDIR(pFsObjState->Stat.st_mode))
1384	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
1385	"Expected file but found directory: '", pszPath, "'");
1386	return supR3HardenedSetError3(VERR_SUPLIB_IS_FILE, pErrInfo,
1387	"Expected directory but found file: '", pszPath, "'");
1388	}
1389
1390	/*
1391	* The group does not matter if it does not have write access, if it has
1392	* write access it must be group 0 (root/wheel/whatever).
1393	*
1394	* This can be extended to include predefined system groups or groups that
1395	* only root is member of.
1396	*/
1397	if ( (pFsObjState->Stat.st_mode & S_IWGRP)
1398	&& pFsObjState->Stat.st_gid != 0)
1399	{
1400	#ifdef RT_OS_DARWIN
1401	/* HACK ALERT: On Darwin /Applications is root:admin with admin having
1402	full access. So, to work around we relax the hardening a bit and
1403	permit grand parents and beyond to be group writable by admin. */
1404	/** @todo dynamically resolve the admin group? */
1405	bool fBad = !fRelaxed \|\| pFsObjState->Stat.st_gid != 80 /admin/ \|\| suplibHardenedStrCmp(pszPath, "/Applications");
1406
1407	#elif defined(RT_OS_FREEBSD)
1408	/* HACK ALERT: PC-BSD 9 has group-writable /usr/pib directory which is
1409	similar to /Applications on OS X (see above).
1410	On FreeBSD root is normally the only member of this group, on
1411	PC-BSD the default user is a member. */
1412	/** @todo dynamically resolve the operator group? */
1413	bool fBad = !fRelaxed \|\| pFsObjState->Stat.st_gid != 5 /operator/ \|\| suplibHardenedStrCmp(pszPath, "/usr/pbi");
1414	NOREF(fRelaxed);
1415	#else
1416	NOREF(fRelaxed);
1417	bool fBad = true;
1418	#endif
1419	if (fBad)
1420	return supR3HardenedSetError3(VERR_SUPLIB_WRITE_NON_SYS_GROUP, pErrInfo,
1421	"The group is not a system group and it has write access to '", pszPath, "'");
1422	}
1423
1424	/*
1425	* World must not have write access. There is no relaxing this rule.
1426	*/
1427	if (pFsObjState->Stat.st_mode & S_IWOTH)
1428	return supR3HardenedSetError3(VERR_SUPLIB_WORLD_WRITABLE, pErrInfo,
1429	"World writable: '", pszPath, "'");
1430
1431	/*
1432	* Check the ACLs.
1433	*/
1434	/** @todo */
1435
1436	return VINF_SUCCESS;
1437	#endif
1438	}
1439
1440
1441	/**
1442	* Verifies that the file system object indicated by the native handle is the
1443	* same as the one @a pFsObjState indicates.
1444	*
1445	* @returns VBox status code, error buffer filled on failure.
1446	* @param hNative The native handle to the object @a pszPath
1447	* specifies and this should be verified to be the
1448	* same file system object.
1449	* @param pFsObjState The information/state returned by a previous
1450	* query call.
1451	* @param pszPath The path to the object @a pFsObjState
1452	* describes. (For the error message.)
1453	* @param pErrInfo The error info structure.
1454	*/
1455	static int supR3HardenedVerifySameFsObject(RTHCUINTPTR hNative, PCSUPR3HARDENEDFSOBJSTATE pFsObjState,
1456	const char *pszPath, PRTERRINFO pErrInfo)
1457	{
1458	SUPR3HARDENEDFSOBJSTATE FsObjState2;
1459	int rc = supR3HardenedQueryFsObjectByHandle(hNative, &FsObjState2, pszPath, pErrInfo);
1460	if (RT_SUCCESS(rc))
1461	rc = supR3HardenedIsSameFsObject(pFsObjState, &FsObjState2, pszPath, pErrInfo);
1462	return rc;
1463	}
1464
1465
1466	/**
1467	* Does the recursive directory enumeration.
1468	*
1469	* @returns VBox status code, error buffer filled on failure.
1470	* @param pszDirPath The path buffer containing the subdirectory to
1471	* enumerate followed by a slash (this is never
1472	* the root slash). The buffer is RTPATH_MAX in
1473	* size and anything starting at @a cchDirPath
1474	* - 1 and beyond is scratch space.
1475	* @param cchDirPath The length of the directory path + slash.
1476	* @param pFsObjState Pointer to the file system object state buffer.
1477	* On input this will hold the stats for
1478	* the directory @a pszDirPath indicates and will
1479	* be used to verified that we're opening the same
1480	* thing.
1481	* @param fRecursive Whether to recurse into subdirectories.
1482	* @param pErrInfo The error info structure.
1483	*/
1484	static int supR3HardenedVerifyDirRecursive(char *pszDirPath, size_t cchDirPath, PSUPR3HARDENEDFSOBJSTATE pFsObjState,
1485	bool fRecursive, PRTERRINFO pErrInfo)
1486	{
1487	#if defined(RT_OS_WINDOWS)
1488	/** @todo Windows hardening. */
1489	return VINF_SUCCESS;
1490
1491	#elif defined(RT_OS_OS2)
1492	/* No hardening here - it's a single user system. */
1493	return VINF_SUCCESS;
1494
1495	#else
1496	/*
1497	* Open the directory. Now, we could probably eliminate opendir here
1498	* and go down on kernel API level (open + getdents for instance), however
1499	* that's not very portable and hopefully not necessary.
1500	*/
1501	DIR *pDir = opendir(pszDirPath);
1502	if (!pDir)
1503	{
1504	/* Ignore access errors. */
1505	if (errno == EACCES)
1506	return VINF_SUCCESS;
1507	return supR3HardenedSetErrorN(VERR_SUPLIB_DIR_ENUM_FAILED, pErrInfo,
1508	5, "opendir failed with ", strerror(errno), " on '", pszDirPath, "'");
1509	}
1510	if (dirfd(pDir) != -1)
1511	{
1512	int rc = supR3HardenedVerifySameFsObject(dirfd(pDir), pFsObjState, pszDirPath, pErrInfo);
1513	if (RT_FAILURE(rc))
1514	{
1515	closedir(pDir);
1516	return rc;
1517	}
1518	}
1519
1520	/*
1521	* Enumerate the directory, check all the requested bits.
1522	*/
1523	int rc = VINF_SUCCESS;
1524	for (;;)
1525	{
1526	pszDirPath[cchDirPath] = '\0'; /* for error messages. */
1527
1528	struct dirent Entry;
1529	struct dirent *pEntry;
1530	int iErr = readdir_r(pDir, &Entry, &pEntry);
1531	if (iErr)
1532	{
1533	rc = supR3HardenedSetErrorN(VERR_SUPLIB_DIR_ENUM_FAILED, pErrInfo,
1534	5, "readdir_r failed with ", strerror(iErr), " in '", pszDirPath, "'");
1535	break;
1536	}
1537	if (!pEntry)
1538	break;
1539
1540	/*
1541	* Check the length and copy it into the path buffer so it can be
1542	* stat()'ed.
1543	*/
1544	size_t cchName = suplibHardenedStrLen(pEntry->d_name);
1545	if (cchName + cchDirPath > SUPR3HARDENED_MAX_PATH)
1546	{
1547	rc = supR3HardenedSetErrorN(VERR_SUPLIB_PATH_TOO_LONG, pErrInfo,
1548	4, "Path grew too long during recursion: '", pszDirPath, pEntry->d_name, "'");
1549	break;
1550	}
1551	suplibHardenedMemCopy(&pszDirPath[cchName], pEntry->d_name, cchName + 1);
1552
1553	/*
1554	* Query the information about the entry and verify it.
1555	* (We don't bother skipping '.' and '..' at this point, a little bit
1556	* of extra checks doesn't hurt and neither requires relaxed handling.)
1557	*/
1558	rc = supR3HardenedQueryFsObjectByPath(pszDirPath, pFsObjState, pErrInfo);
1559	if (RT_SUCCESS(rc))
1560	break;
1561	rc = supR3HardenedVerifyFsObject(pFsObjState, S_ISDIR(pFsObjState->Stat.st_mode), false /fRelaxed/,
1562	pszDirPath, pErrInfo);
1563	if (RT_FAILURE(rc))
1564	break;
1565
1566	/*
1567	* Recurse into subdirectories if requested.
1568	*/
1569	if ( fRecursive
1570	&& S_ISDIR(pFsObjState->Stat.st_mode)
1571	&& suplibHardenedStrCmp(pEntry->d_name, ".")
1572	&& suplibHardenedStrCmp(pEntry->d_name, ".."))
1573	{
1574	pszDirPath[cchDirPath + cchName] = RTPATH_SLASH;
1575	pszDirPath[cchDirPath + cchName + 1] = '\0';
1576
1577	rc = supR3HardenedVerifyDirRecursive(pszDirPath, cchDirPath + cchName + 1, pFsObjState,
1578	fRecursive, pErrInfo);
1579	if (RT_FAILURE(rc))
1580	break;
1581	}
1582	}
1583
1584	closedir(pDir);
1585	return VINF_SUCCESS;
1586	#endif
1587	}
1588
1589
1590	/**
1591	* Worker for SUPR3HardenedVerifyDir.
1592	*
1593	* @returns See SUPR3HardenedVerifyDir.
1594	* @param pszDirPath See SUPR3HardenedVerifyDir.
1595	* @param fRecursive See SUPR3HardenedVerifyDir.
1596	* @param fCheckFiles See SUPR3HardenedVerifyDir.
1597	* @param pErrInfo See SUPR3HardenedVerifyDir.
1598	*/
1599	DECLHIDDEN(int) supR3HardenedVerifyDir(const char *pszDirPath, bool fRecursive, bool fCheckFiles, PRTERRINFO pErrInfo)
1600	{
1601	/*
1602	* Validate the input path and parse it.
1603	*/
1604	SUPR3HARDENEDPATHINFO Info;
1605	int rc = supR3HardenedVerifyPathSanity(pszDirPath, pErrInfo, &Info);
1606	if (RT_FAILURE(rc))
1607	return rc;
1608
1609	/*
1610	* Verify each component from the root up.
1611	*/
1612	SUPR3HARDENEDFSOBJSTATE FsObjState;
1613	uint32_t const cComponents = Info.cComponents;
1614	for (uint32_t iComponent = 0; iComponent < cComponents; iComponent++)
1615	{
1616	bool fRelaxed = iComponent + 2 < cComponents;
1617	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = '\0';
1618	rc = supR3HardenedQueryFsObjectByPath(Info.szPath, &FsObjState, pErrInfo);
1619	if (RT_SUCCESS(rc))
1620	rc = supR3HardenedVerifyFsObject(&FsObjState, true /fDir/, fRelaxed, Info.szPath, pErrInfo);
1621	if (RT_FAILURE(rc))
1622	return rc;
1623	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = iComponent + 1 != cComponents ? RTPATH_SLASH : '\0';
1624	}
1625
1626	/*
1627	* Check files and subdirectories if requested.
1628	*/
1629	if (fCheckFiles \|\| fRecursive)
1630	{
1631	Info.szPath[Info.cch] = RTPATH_SLASH;
1632	Info.szPath[Info.cch + 1] = '\0';
1633	return supR3HardenedVerifyDirRecursive(Info.szPath, Info.cch + 1, &FsObjState,
1634	fRecursive, pErrInfo);
1635	}
1636
1637	return VINF_SUCCESS;
1638	}
1639
1640
1641	/**
1642	* Verfies a file.
1643	*
1644	* @returns VBox status code, error buffer filled on failure.
1645	* @param pszFilename The file to verify.
1646	* @param hNativeFile Handle to the file, verify that it's the same
1647	* as we ended up with when verifying the path.
1648	* RTHCUINTPTR_MAX means NIL here.
1649	* @param fMaybe3rdParty Set if the file is could be a supplied by a
1650	* third party. Different validation rules may
1651	* apply to 3rd party code on some platforms.
1652	* @param pErrInfo Where to return extended error information.
1653	* Optional.
1654	*/
1655	DECLHIDDEN(int) supR3HardenedVerifyFile(const char *pszFilename, RTHCUINTPTR hNativeFile,
1656	bool fMaybe3rdParty, PRTERRINFO pErrInfo)
1657	{
1658	/*
1659	* Validate the input path and parse it.
1660	*/
1661	SUPR3HARDENEDPATHINFO Info;
1662	int rc = supR3HardenedVerifyPathSanity(pszFilename, pErrInfo, &Info);
1663	if (RT_FAILURE(rc))
1664	return rc;
1665	if (Info.fDirSlash)
1666	return supR3HardenedSetError3(VERR_SUPLIB_IS_DIRECTORY, pErrInfo,
1667	"The file path specifies a directory: '", pszFilename, "'");
1668
1669	/*
1670	* Verify each component from the root up.
1671	*/
1672	SUPR3HARDENEDFSOBJSTATE FsObjState;
1673	uint32_t const cComponents = Info.cComponents;
1674	for (uint32_t iComponent = 0; iComponent < cComponents; iComponent++)
1675	{
1676	bool fFinal = iComponent + 1 == cComponents;
1677	bool fRelaxed = iComponent + 2 < cComponents;
1678	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = '\0';
1679	rc = supR3HardenedQueryFsObjectByPath(Info.szPath, &FsObjState, pErrInfo);
1680	if (RT_SUCCESS(rc))
1681	rc = supR3HardenedVerifyFsObject(&FsObjState, !fFinal /fDir/, fRelaxed, Info.szPath, pErrInfo);
1682	if (RT_FAILURE(rc))
1683	return rc;
1684	Info.szPath[Info.aoffComponents[iComponent + 1] - 1] = !fFinal ? RTPATH_SLASH : '\0';
1685	}
1686
1687	/*
1688	* Verify the file handle against the last component, if specified.
1689	*/
1690	if (hNativeFile != RTHCUINTPTR_MAX)
1691	{
1692	rc = supR3HardenedVerifySameFsObject(hNativeFile, &FsObjState, Info.szPath, pErrInfo);
1693	if (RT_FAILURE(rc))
1694	return rc;
1695	}
1696
1697	#ifdef RT_OS_WINDOWS
1698	/*
1699	* The files shall be signed on windows, verify that.
1700	*/
1701	rc = VINF_SUCCESS;
1702	HANDLE hVerify;
1703	if (hNativeFile == RTHCUINTPTR_MAX)
1704	{
1705	PRTUTF16 pwszPath;
1706	rc = RTStrToUtf16(pszFilename, &pwszPath);
1707	if (RT_SUCCESS(rc))
1708	{
1709	hVerify = CreateFileW(pwszPath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
1710	RTUtf16Free(pwszPath);
1711	}
1712	else
1713	rc = RTErrInfoSetF(pErrInfo, rc, "Error converting '%s' to UTF-16: %Rrc", pszFilename, rc);
1714	}
1715	else
1716	{
1717	NTSTATUS rcNt = NtDuplicateObject(NtCurrentProcess(), (HANDLE)hNativeFile, NtCurrentProcess(), &hVerify,
1718	GENERIC_READ, 0 /HandleAttributes/, 0 /Options/);
1719	if (!NT_SUCCESS(rcNt))
1720	hVerify = INVALID_HANDLE_VALUE;
1721	}
1722	if (hVerify != INVALID_HANDLE_VALUE)
1723	{
1724	# ifdef VBOX_WITH_HARDENING
1725	uint32_t fFlags = SUPHNTVI_F_REQUIRE_KERNEL_CODE_SIGNING;
1726	if (!fMaybe3rdParty)
1727	fFlags = SUPHNTVI_F_REQUIRE_BUILD_CERT;
1728	const char *pszSuffix = RTPathSuffix(pszFilename);
1729	if ( pszSuffix
1730	&& pszSuffix[0] == '.'
1731	&& ( RT_C_TO_LOWER(pszSuffix[1]) == 'r'
1732	\|\| RT_C_TO_LOWER(pszSuffix[1]) == 'g')
1733	&& RT_C_TO_LOWER(pszSuffix[2]) == 'c'
1734	&& pszSuffix[3] == '\0' )
1735	fFlags \|= SUPHNTVI_F_RC_IMAGE;
1736	# ifndef IN_SUP_R3_STATIC /* Not in VBoxCpuReport and friends. */
1737	rc = supHardenedWinVerifyImageByHandleNoName(hVerify, fFlags, pErrInfo);
1738	# endif
1739	# endif
1740	CloseHandle(hVerify);
1741	}
1742	else if (RT_SUCCESS(rc))
1743	rc = RTErrInfoSetF(pErrInfo, RTErrConvertFromWin32(GetLastError()),
1744	"Error %u trying to open (or duplicate handle for) '%s'", GetLastError(), pszFilename);
1745	if (RT_FAILURE(rc))
1746	return rc;
1747	#endif
1748
1749	return VINF_SUCCESS;
1750	}
1751
1752
1753	/**
1754	* Gets the pre-init data for the hand-over to the other version
1755	* of this code.
1756	*
1757	* The reason why we pass this information on is that it contains
1758	* open directories and files. Later it may include even more info
1759	* (int the verified arrays mostly).
1760	*
1761	* The receiver is supR3HardenedRecvPreInitData.
1762	*
1763	* @param pPreInitData Where to store it.
1764	*/
1765	DECLHIDDEN(void) supR3HardenedGetPreInitData(PSUPPREINITDATA pPreInitData)
1766	{
1767	pPreInitData->cInstallFiles = RT_ELEMENTS(g_aSupInstallFiles);
1768	pPreInitData->paInstallFiles = &g_aSupInstallFiles[0];
1769	pPreInitData->paVerifiedFiles = &g_aSupVerifiedFiles[0];
1770
1771	pPreInitData->cVerifiedDirs = RT_ELEMENTS(g_aSupVerifiedDirs);
1772	pPreInitData->paVerifiedDirs = &g_aSupVerifiedDirs[0];
1773	}
1774
1775
1776	/**
1777	* Receives the pre-init data from the static executable stub.
1778	*
1779	* @returns VBox status code. Will not bitch on failure since the
1780	* runtime isn't ready for it, so that is left to the exe stub.
1781	*
1782	* @param pPreInitData The hand-over data.
1783	*/
1784	DECLHIDDEN(int) supR3HardenedRecvPreInitData(PCSUPPREINITDATA pPreInitData)
1785	{
1786	/*
1787	* Compare the array lengths and the contents of g_aSupInstallFiles.
1788	*/
1789	if ( pPreInitData->cInstallFiles != RT_ELEMENTS(g_aSupInstallFiles)
1790	\|\| pPreInitData->cVerifiedDirs != RT_ELEMENTS(g_aSupVerifiedDirs))
1791	return VERR_VERSION_MISMATCH;
1792	SUPINSTFILE const *paInstallFiles = pPreInitData->paInstallFiles;
1793	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
1794	if ( g_aSupInstallFiles[iFile].enmDir != paInstallFiles[iFile].enmDir
1795	\|\| g_aSupInstallFiles[iFile].enmType != paInstallFiles[iFile].enmType
1796	\|\| g_aSupInstallFiles[iFile].fOptional != paInstallFiles[iFile].fOptional
1797	\|\| suplibHardenedStrCmp(g_aSupInstallFiles[iFile].pszFile, paInstallFiles[iFile].pszFile))
1798	return VERR_VERSION_MISMATCH;
1799
1800	/*
1801	* Check that we're not called out of order.
1802	* If dynamic linking it screwed up, we may end up here.
1803	*/
1804	if ( ASMMemIsAll8(&g_aSupVerifiedFiles[0], sizeof(g_aSupVerifiedFiles), 0) != NULL
1805	\|\| ASMMemIsAll8(&g_aSupVerifiedDirs[0], sizeof(g_aSupVerifiedDirs), 0) != NULL)
1806	return VERR_WRONG_ORDER;
1807
1808	/*
1809	* Copy the verification data over.
1810	*/
1811	suplibHardenedMemCopy(&g_aSupVerifiedFiles[0], pPreInitData->paVerifiedFiles, sizeof(g_aSupVerifiedFiles));
1812	suplibHardenedMemCopy(&g_aSupVerifiedDirs[0], pPreInitData->paVerifiedDirs, sizeof(g_aSupVerifiedDirs));
1813	return VINF_SUCCESS;
1814	}

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source: vbox/trunk/src/VBox/HostDrivers/Support/SUPR3HardenedVerify.cpp@ 52355

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