SUPR3HardenedVerify.cpp@ 17935

Last change on this file since 17935 was 17794, checked in by vboxsync, 16 years ago
SUPR3/Hardend builds: Update.
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1	/* $Id: SUPR3HardenedVerify.cpp 17794 2009-03-13 09:36:06Z vboxsync $ */
2	/** @file
3	* VirtualBox Support Library - Verification of Hardened Installation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2008 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31	/*******************************************************************************
32	* Header Files *
33	*******************************************************************************/
34	#if defined(RT_OS_OS2)
35	# define INCL_BASE
36	# define INCL_ERRORS
37	# include <os2.h>
38	# include <stdio.h>
39	# include <stdlib.h>
40	# include <unistd.h>
41	# include <sys/fcntl.h>
42	# include <sys/errno.h>
43	# include <sys/syslimits.h>
44
45	#elif defined(RT_OS_WINDOWS)
46	# include <Windows.h>
47	# include <stdio.h>
48
49	#else /* UNIXes */
50	# include <sys/types.h>
51	# include <stdio.h>
52	# include <stdlib.h>
53	# include <dlfcn.h>
54	# include <fcntl.h>
55	# include <limits.h>
56	# include <errno.h>
57	# include <unistd.h>
58	# include <sys/stat.h>
59	# include <sys/time.h>
60	# include <sys/fcntl.h>
61	# include <stdio.h>
62	# include <pwd.h>
63	# ifdef RT_OS_DARWIN
64	# include <mach-o/dyld.h>
65	# endif
66
67	#endif
68
69	#include <VBox/sup.h>
70	#include <VBox/err.h>
71	#include <iprt/string.h>
72	#include <iprt/param.h>
73
74	#include "SUPLibInternal.h"
75
76
77
78
79	/*******************************************************************************
80	* Global Variables *
81	*******************************************************************************/
82	/**
83	* The files that gets verified.
84	*
85	* @todo This needs reviewing against the linux packages.
86	* @todo The excessive use of kSupID_SharedLib needs to be reviewed at some point. For
87	* the time being we're building the linux packages with SharedLib pointing to
88	* AppPrivArch (lazy bird).
89	*/
90	static SUPINSTFILE const g_aSupInstallFiles[] =
91	{
92	/* type, dir,fOptional, pszFile */
93	/* ---------------------------------------------------------------------- */
94	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VMMR0.r0" },
95	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDDR0.r0" },
96	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDD2R0.r0" },
97
98	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VMMGC.gc" },
99	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDDGC.gc" },
100	{ kSupIFT_Dll, kSupID_AppPrivArch, false, "VBoxDD2GC.gc" },
101
102	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxRT" SUPLIB_DLL_SUFF },
103	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxVMM" SUPLIB_DLL_SUFF },
104	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxREM" SUPLIB_DLL_SUFF },
105	#if HC_ARCH_BITS == 32
106	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxREM32" SUPLIB_DLL_SUFF },
107	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxREM64" SUPLIB_DLL_SUFF },
108	#endif
109	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDD" SUPLIB_DLL_SUFF },
110	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDD2" SUPLIB_DLL_SUFF },
111	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxDDU" SUPLIB_DLL_SUFF },
112
113	//#ifdef VBOX_WITH_DEBUGGER_GUI
114	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxDbg" SUPLIB_DLL_SUFF },
115	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxDbg3" SUPLIB_DLL_SUFF },
116	//#endif
117
118	//#ifdef VBOX_WITH_SHARED_CLIPBOARD
119	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedClipboard" SUPLIB_DLL_SUFF },
120	//#endif
121	//#ifdef VBOX_WITH_SHARED_FOLDERS
122	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedFolders" SUPLIB_DLL_SUFF },
123	//#endif
124	//#ifdef VBOX_WITH_GUEST_PROPS
125	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxGuestPropSvc" SUPLIB_DLL_SUFF },
126	//#endif
127	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSharedCrOpenGL" SUPLIB_DLL_SUFF },
128	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhostcrutil" SUPLIB_DLL_SUFF },
129	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLhosterrorspu" SUPLIB_DLL_SUFF },
130	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxOGLrenderspu" SUPLIB_DLL_SUFF },
131
132	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxManage" SUPLIB_EXE_SUFF },
133
134	#ifdef VBOX_WITH_MAIN
135	{ kSupIFT_Exe, kSupID_AppBin, false, "VBoxSVC" SUPLIB_EXE_SUFF },
136	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxSettings" SUPLIB_DLL_SUFF },
137	#ifdef RT_OS_WINDOWS
138	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxC" SUPLIB_DLL_SUFF },
139	#else
140	{ kSupIFT_Exe, kSupID_AppPrivArch, false, "VBoxXPCOMIPCD" SUPLIB_EXE_SUFF },
141	{ kSupIFT_Dll, kSupID_SharedLib, false, "VBoxXPCOM" SUPLIB_DLL_SUFF },
142	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxXPCOMIPCC" SUPLIB_DLL_SUFF },
143	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxC" SUPLIB_DLL_SUFF },
144	{ kSupIFT_Dll, kSupID_AppPrivArchComp, false, "VBoxSVCM" SUPLIB_DLL_SUFF },
145	{ kSupIFT_Data, kSupID_AppPrivArchComp, false, "VBoxXPCOMBase.xpt" },
146	#endif
147	#endif
148
149	//#ifdef VBOX_WITH_VRDP
150	{ kSupIFT_Dll, kSupID_SharedLib, true, "VRDPAuth" SUPLIB_DLL_SUFF },
151	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxVRDP" SUPLIB_DLL_SUFF },
152	//#endif
153
154	//#ifdef VBOX_WITH_HEADLESS
155	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxHeadless" SUPLIB_EXE_SUFF },
156	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxHeadless" SUPLIB_DLL_SUFF },
157	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxFFmpegFB" SUPLIB_DLL_SUFF },
158	//#endif
159
160	//#ifdef VBOX_WITH_QTGUI
161	{ kSupIFT_Exe, kSupID_AppBin, true, "VirtualBox" SUPLIB_EXE_SUFF },
162	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VirtualBox" SUPLIB_DLL_SUFF },
163	# if !defined(RT_OS_DARWIN) && !defined(RT_OS_WINDOWS) && !defined(RT_OS_OS2)
164	{ kSupIFT_Dll, kSupID_SharedLib, true, "VBoxKeyboard" SUPLIB_DLL_SUFF },
165	# endif
166	//#endif
167
168	//#ifdef VBOX_WITH_VBOXSDL
169	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxSDL" SUPLIB_EXE_SUFF },
170	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxSDL" SUPLIB_DLL_SUFF },
171	//#endif
172
173	//#ifdef VBOX_WITH_VBOXBFE
174	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxBFE" SUPLIB_EXE_SUFF },
175	{ kSupIFT_Dll, kSupID_AppPrivArch, true, "VBoxBFE" SUPLIB_DLL_SUFF },
176	//#endif
177
178	//#ifdef VBOX_WITH_WEBSERVICES
179	{ kSupIFT_Exe, kSupID_AppBin, true, "vboxwebsrv" SUPLIB_EXE_SUFF },
180	//#endif
181
182	#ifdef RT_OS_LINUX
183	{ kSupIFT_Exe, kSupID_AppBin, true, "VBoxTunctl" SUPLIB_EXE_SUFF },
184	#endif
185	};
186
187
188	/** Array parallel to g_aSupInstallFiles containing per-file status info. */
189	static SUPVERIFIEDFILE g_aSupVerifiedFiles[RT_ELEMENTS(g_aSupInstallFiles)];
190
191	/** Array index by install directory specifier containing info about verified directories. */
192	static SUPVERIFIEDDIR g_aSupVerifiedDirs[kSupID_End];
193
194
195	/**
196	* Assembles the path to a dirtory.
197	*
198	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
199	* decides whether it returns or not).
200	*
201	* @param enmDir The directory.
202	* @param pszDst Where to assemble the path.
203	* @param cchDst The size of the buffer.
204	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
205	*/
206	static int supR3HardenedMakePath(SUPINSTDIR enmDir, char *pszDst, size_t cchDst, bool fFatal)
207	{
208	int rc;
209	switch (enmDir)
210	{
211	case kSupID_AppBin: /** @todo fix this AppBin crap (uncertain wtf some binaries actually are installed). */
212	case kSupID_Bin:
213	rc = supR3HardenedPathProgram(pszDst, cchDst);
214	break;
215	case kSupID_SharedLib:
216	rc = supR3HardenedPathSharedLibs(pszDst, cchDst);
217	break;
218	case kSupID_AppPrivArch:
219	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
220	break;
221	case kSupID_AppPrivArchComp:
222	rc = supR3HardenedPathAppPrivateArch(pszDst, cchDst);
223	if (RT_SUCCESS(rc))
224	{
225	size_t off = strlen(pszDst);
226	if (cchDst - off >= sizeof("/components"))
227	memcpy(&pszDst[off], "/components", sizeof("/components"));
228	else
229	rc = VERR_BUFFER_OVERFLOW;
230	}
231	break;
232	case kSupID_AppPrivNoArch:
233	rc = supR3HardenedPathAppPrivateNoArch(pszDst, cchDst);
234	break;
235	default:
236	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
237	"supR3HardenedMakePath: enmDir=%d\n", enmDir);
238	}
239	if (RT_FAILURE(rc))
240	supR3HardenedError(rc, fFatal,
241	"supR3HardenedMakePath: enmDir=%d rc=%d\n", enmDir, rc);
242	return rc;
243	}
244
245
246
247	/**
248	* Assembles the path to a file table entry, with or without the actual filename.
249	*
250	* @returns VINF_SUCCESS on success, some error code on failure (fFatal
251	* decides whether it returns or not).
252	*
253	* @param pFile The file table entry.
254	* @param pszDst Where to assemble the path.
255	* @param cchDst The size of the buffer.
256	* @param fWithFilename If set, the filename is included, otherwise it is omitted (no trailing slash).
257	* @param fFatal Whether failures should be treated as fatal (true) or not (false).
258	*/
259	static int supR3HardenedMakeFilePath(PCSUPINSTFILE pFile, char *pszDst, size_t cchDst, bool fWithFilename, bool fFatal)
260	{
261	/*
262	* Combine supR3HardenedMakePath and the filename.
263	*/
264	int rc = supR3HardenedMakePath(pFile->enmDir, pszDst, cchDst, fFatal);
265	if (RT_SUCCESS(rc))
266	{
267	size_t cchFile = strlen(pFile->pszFile);
268	size_t off = strlen(pszDst);
269	if (cchDst - off >= cchFile + 2)
270	{
271	pszDst[off++] = '/';
272	memcpy(&pszDst[off], pFile->pszFile, cchFile + 1);
273	}
274	else
275	rc = supR3HardenedError(VERR_BUFFER_OVERFLOW, fFatal,
276	"supR3HardenedMakeFilePath: pszFile=%s off=%lu\n",
277	pFile->pszFile, (long)off);
278	}
279	return rc;
280	}
281
282
283	/**
284	* Verifies a directory.
285	*
286	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
287	* fFatal is clear and if it's set the function wont return.
288	* @param enmDir The directory specifier.
289	* @param fFatal Whether validation failures should be treated as
290	* fatal (true) or not (false).
291	*/
292	DECLHIDDEN(int) supR3HardenedVerifyDir(SUPINSTDIR enmDir, bool fFatal)
293	{
294	/*
295	* Validate the index just to be on the safe side...
296	*/
297	if (enmDir <= kSupID_Invalid \|\| enmDir >= kSupID_End)
298	return supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
299	"supR3HardenedVerifyDir: enmDir=%d\n", enmDir);
300
301	/*
302	* Already validated?
303	*/
304	if (g_aSupVerifiedDirs[enmDir].fValidated)
305	return VINF_SUCCESS; /** @todo revalidate? */
306
307	/* initialize the entry. */
308	if (g_aSupVerifiedDirs[enmDir].hDir != 0)
309	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
310	"supR3HardenedVerifyDir: hDir=%p enmDir=%d\n",
311	(void *)g_aSupVerifiedDirs[enmDir].hDir, enmDir);
312	g_aSupVerifiedDirs[enmDir].hDir = -1;
313	g_aSupVerifiedDirs[enmDir].fValidated = false;
314
315	/*
316	* Make the path and open the directory.
317	*/
318	char szPath[RTPATH_MAX];
319	int rc = supR3HardenedMakePath(enmDir, szPath, sizeof(szPath), fFatal);
320	if (RT_SUCCESS(rc))
321	{
322	#if defined(RT_OS_WINDOWS)
323	HANDLE hDir = CreateFile(szPath,
324	GENERIC_READ,
325	FILE_SHARE_READ \| FILE_SHARE_DELETE \| FILE_SHARE_WRITE,
326	NULL,
327	OPEN_ALWAYS,
328	FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_BACKUP_SEMANTICS,
329	NULL);
330	if (hDir != INVALID_HANDLE_VALUE)
331	{
332	/** @todo check the type */
333	/* That's all on windows, for now at least... */
334	g_aSupVerifiedDirs[enmDir].hDir = (intptr_t)hDir;
335	g_aSupVerifiedDirs[enmDir].fValidated = true;
336	}
337	else
338	{
339	int err = GetLastError();
340	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
341	"supR3HardenedVerifyDir: Failed to open \"%s\": err=%d\n",
342	szPath, err);
343	}
344	#else /* UNIXY */
345	int fd = open(szPath, O_RDONLY, 0);
346	if (fd >= 0)
347	{
348	/*
349	* On unixy systems we'll make sure the directory is owned by root
350	* and not writable by the group and user.
351	*/
352	struct stat st;
353	if (!fstat(fd, &st))
354	{
355
356	if ( st.st_uid == 0
357	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
358	&& S_ISDIR(st.st_mode))
359	{
360	g_aSupVerifiedDirs[enmDir].hDir = fd;
361	g_aSupVerifiedDirs[enmDir].fValidated = true;
362	}
363	else
364	{
365	if (!S_ISDIR(st.st_mode))
366	rc = supR3HardenedError(VERR_NOT_A_DIRECTORY, fFatal,
367	"supR3HardenedVerifyDir: \"%s\" is not a directory\n",
368	szPath, (long)st.st_uid);
369	else if (st.st_uid)
370	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
371	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": not owned by root (st_uid=%ld)\n",
372	szPath, (long)st.st_uid);
373	else
374	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
375	"supR3HardenedVerifyDir: Cannot trust the directory \"%s\": group and/or other writable (st_mode=0%lo)\n",
376	szPath, (long)st.st_mode);
377	close(fd);
378	}
379	}
380	else
381	{
382	int err = errno;
383	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
384	"supR3HardenedVerifyDir: Failed to fstat \"%s\": %s (%d)\n",
385	szPath, strerror(err), err);
386	close(fd);
387	}
388	}
389	else
390	{
391	int err = errno;
392	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
393	"supR3HardenedVerifyDir: Failed to open \"%s\": %s (%d)\n",
394	szPath, strerror(err), err);
395	}
396	#endif /* UNIXY */
397	}
398
399	return rc;
400	}
401
402
403	/**
404	* Verifies a file entry.
405	*
406	* @returns VINF_SUCCESS on success. On failure, an error code is returned if
407	* fFatal is clear and if it's set the function wont return.
408	*
409	* @param iFile The file table index of the file to be verified.
410	* @param fFatal Whether validation failures should be treated as
411	* fatal (true) or not (false).
412	* @param fLeaveFileOpen Whether the file should be left open.
413	*/
414	static int supR3HardenedVerifyFileInternal(int iFile, bool fFatal, bool fLeaveFileOpen)
415	{
416	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
417	PSUPVERIFIEDFILE pVerified = &g_aSupVerifiedFiles[iFile];
418
419	/*
420	* Already done?
421	*/
422	if (pVerified->fValidated)
423	return VINF_SUCCESS; /** @todo revalidate? */
424
425
426	/* initialize the entry. */
427	if (pVerified->hFile != 0)
428	supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
429	"supR3HardenedVerifyFileInternal: hFile=%p (%s)\n",
430	(void *)pVerified->hFile, pFile->pszFile);
431	pVerified->hFile = -1;
432	pVerified->fValidated = false;
433
434	/*
435	* Verify the directory then proceed to open it.
436	* (This'll make sure the directory is opened and that we can (later)
437	* use openat if we wish.)
438	*/
439	int rc = supR3HardenedVerifyDir(pFile->enmDir, fFatal);
440	if (RT_SUCCESS(rc))
441	{
442	char szPath[RTPATH_MAX];
443	int rc = supR3HardenedMakeFilePath(pFile, szPath, sizeof(szPath), true, fFatal);
444	if (RT_SUCCESS(rc))
445	{
446	#if defined(RT_OS_WINDOWS)
447	HANDLE hFile = CreateFile(szPath,
448	GENERIC_READ,
449	FILE_SHARE_READ,
450	NULL,
451	OPEN_ALWAYS,
452	FILE_ATTRIBUTE_NORMAL,
453	NULL);
454	if (hFile != INVALID_HANDLE_VALUE)
455	{
456	/** @todo Check the type, and verify the signature (separate function so we can skip it). */
457	{
458	/* it's valid. */
459	if (fLeaveFileOpen)
460	pVerified->hFile = (intptr_t)hFile;
461	else
462	CloseHandle(hFile);
463	pVerified->fValidated = true;
464	}
465	}
466	else
467	{
468	int err = GetLastError();
469	if (!pFile->fOptional \|\| err != ERROR_FILE_NOT_FOUND)
470	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
471	"supR3HardenedVerifyFileInternal: Failed to open \"%s\": err=%d\n",
472	szPath, err);
473	}
474	#else /* UNIXY */
475	int fd = open(szPath, O_RDONLY, 0);
476	if (fd >= 0)
477	{
478	/*
479	* On unixy systems we'll make sure the directory is owned by root
480	* and not writable by the group and user.
481	*/
482	struct stat st;
483	if (!fstat(fd, &st))
484	{
485	if ( st.st_uid == 0
486	&& !(st.st_mode & (S_IWGRP \| S_IWOTH))
487	&& S_ISREG(st.st_mode))
488	{
489	/* it's valid. */
490	if (fLeaveFileOpen)
491	pVerified->hFile = fd;
492	else
493	close(fd);
494	pVerified->fValidated = true;
495	}
496	else
497	{
498	if (!S_ISREG(st.st_mode))
499	rc = supR3HardenedError(VERR_IS_A_DIRECTORY, fFatal,
500	"supR3HardenedVerifyFileInternal: \"%s\" is not a regular file\n",
501	szPath, (long)st.st_uid);
502	else if (st.st_uid)
503	rc = supR3HardenedError(VERR_ACCESS_DENIED, fFatal,
504	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%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	"supR3HardenedVerifyFileInternal: Cannot trust the file \"%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	"supR3HardenedVerifyFileInternal: Failed to fstat \"%s\": %s (%d)\n",
518	szPath, strerror(err), err);
519	close(fd);
520	}
521	}
522	else
523	{
524	int err = errno;
525	if (!pFile->fOptional \|\| err != ENOENT)
526	rc = supR3HardenedError(VERR_PATH_NOT_FOUND, fFatal,
527	"supR3HardenedVerifyFileInternal: Failed to open \"%s\": %s (%d)\n",
528	szPath, strerror(err), err);
529	}
530	#endif /* UNIXY */
531	}
532	}
533
534	return rc;
535	}
536
537
538	/**
539	* Verifies that the specified table entry matches the given filename.
540	*
541	* @returns VINF_SUCCESS if matching. On mismatch fFatal indicates whether an
542	* error is returned or we terminate the application.
543	*
544	* @param iFile The file table index.
545	* @param pszFilename The filename.
546	* @param fFatal Whether validation failures should be treated as
547	* fatal (true) or not (false).
548	*/
549	static int supR3HardenedVerifySameFile(int iFile, const char *pszFilename, bool fFatal)
550	{
551	PCSUPINSTFILE pFile = &g_aSupInstallFiles[iFile];
552
553	/*
554	* Construct the full path for the file table entry
555	* and compare it with the specified file.
556	*/
557	char szName[RTPATH_MAX];
558	int rc = supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
559	if (RT_FAILURE(rc))
560	return rc;
561	#if defined(RT_OS_WINDOWS) \|\| defined(RT_OS_OS2)
562	if (stricmp(szName, pszFilename))
563	#else
564	if (strcmp(szName, pszFilename))
565	#endif
566	{
567	/*
568	* Normalize the two paths and compare again.
569	*/
570	rc = VERR_NOT_SAME_DEVICE;
571	#if defined(RT_OS_WINDOWS)
572	LPSTR pszIgnored;
573	char szName2[RTPATH_MAX];
574	if ( GetFullPathName(szName, RT_ELEMENTS(szName2), &szName2[0], &pszIgnored)
575	&& GetFullPathName(pszFilename, RT_ELEMENTS(szName), &szName[0], &pszIgnored))
576	if (!stricmp(szName2, szName))
577	rc = VINF_SUCCESS;
578	#else
579	AssertCompile(RTPATH_MAX >= PATH_MAX);
580	char szName2[RTPATH_MAX];
581	if ( realpath(szName, szName2) != NULL
582	&& realpath(pszFilename, szName) != NULL)
583	if (!strcmp(szName2, szName))
584	rc = VINF_SUCCESS;
585	#endif
586
587	if (RT_FAILURE(rc))
588	{
589	supR3HardenedMakeFilePath(pFile, szName, sizeof(szName), true /fWithFilename/, fFatal);
590	return supR3HardenedError(rc, fFatal,
591	"supR3HardenedVerifySameFile: \"%s\" isn't the same as \"%s\"\n",
592	pszFilename, szName);
593	}
594	}
595
596	/*
597	* Check more stuff like the stat info if it's an already open file?
598	*/
599
600
601
602	return VINF_SUCCESS;
603	}
604
605
606	/**
607	* Verifies a file.
608	*
609	* @returns VINF_SUCCESS on success.
610	* VERR_NOT_FOUND if the file isn't in the table, this isn't ever a fatal error.
611	* On verfication failure, an error code will be returned when fFatal is clear,
612	* otherwise the program will be termindated.
613	*
614	* @param pszFilename The filename.
615	* @param fFatal Whether validation failures should be treated as
616	* fatal (true) or not (false).
617	*/
618	DECLHIDDEN(int) supR3HardenedVerifyFile(const char *pszFilename, bool fFatal)
619	{
620	/*
621	* Lookup the file and check if it's the same file.
622	*/
623	const char *pszName = supR3HardenedPathFilename(pszFilename);
624	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
625	if (!strcmp(pszName, g_aSupInstallFiles[iFile].pszFile))
626	{
627	int rc = supR3HardenedVerifySameFile(iFile, pszFilename, fFatal);
628	if (RT_SUCCESS(rc))
629	rc = supR3HardenedVerifyFileInternal(iFile, fFatal, false /* fLeaveFileOpen */);
630	return rc;
631	}
632
633	return VERR_NOT_FOUND;
634	}
635
636
637	/**
638	* Verifies a program, worker for supR3HardenedVerifyAll.
639	*
640	* @returns See supR3HardenedVerifyAll.
641	* @param pszProgName See supR3HardenedVerifyAll.
642	* @param fFatal See supR3HardenedVerifyAll.
643	*/
644	static int supR3HardenedVerifyProgram(const char *pszProgName, bool fFatal)
645	{
646	/*
647	* Search the table looking for the executable and the DLL/DYLIB/SO.
648	*/
649	int rc = VINF_SUCCESS;
650	bool fExe = false;
651	bool fDll = false;
652	size_t const cchProgName = strlen(pszProgName);
653	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
654	if (!strncmp(pszProgName, g_aSupInstallFiles[iFile].pszFile, cchProgName))
655	{
656	if ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Dll
657	&& !strcmp(&g_aSupInstallFiles[iFile].pszFile[cchProgName], SUPLIB_DLL_SUFF))
658	{
659	/* This only has to be found (once). */
660	if (fDll)
661	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
662	"supR3HardenedVerifyProgram: duplicate DLL entry for \"%s\"\n", pszProgName);
663	fDll = true;
664	}
665	else if ( g_aSupInstallFiles[iFile].enmType == kSupIFT_Exe
666	&& !strcmp(&g_aSupInstallFiles[iFile].pszFile[cchProgName], SUPLIB_EXE_SUFF))
667	{
668	/* Here we'll have to check that the specific program is the same as the entry. */
669	if (fExe)
670	rc = supR3HardenedError(VERR_INTERNAL_ERROR, fFatal,
671	"supR3HardenedVerifyProgram: duplicate EXE entry for \"%s\"\n", pszProgName);
672	fExe = true;
673
674	char szFilename[RTPATH_MAX];
675	int rc2 = supR3HardenedPathProgram(szFilename, sizeof(szFilename) - cchProgName - sizeof(SUPLIB_EXE_SUFF));
676	if (RT_SUCCESS(rc2))
677	{
678	strcat(szFilename, "/");
679	strcat(szFilename, g_aSupInstallFiles[iFile].pszFile);
680	supR3HardenedVerifySameFile(iFile, szFilename, fFatal);
681	}
682	else
683	rc = supR3HardenedError(rc2, fFatal,
684	"supR3HardenedVerifyProgram: failed to query program path: rc=%d\n", rc2);
685	}
686	}
687
688	/*
689	* Check the findings.
690	*/
691	if (!fDll && !fExe)
692	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
693	"supR3HardenedVerifyProgram: Couldn't find the program \"%s\"\n", pszProgName);
694	else if (!fExe)
695	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
696	"supR3HardenedVerifyProgram: Couldn't find the EXE entry for \"%s\"\n", pszProgName);
697	else if (!fDll)
698	rc = supR3HardenedError(VERR_NOT_FOUND, fFatal,
699	"supR3HardenedVerifyProgram: Couldn't find the DLL entry for \"%s\"\n", pszProgName);
700	return rc;
701	}
702
703
704
705	/**
706	* Verifies all the known files.
707	*
708	* @returns VINF_SUCCESS on success.
709	* On verfication failure, an error code will be returned when fFatal is clear,
710	* otherwise the program will be termindated.
711	*
712	* @param fFatal Whether validation failures should be treated as
713	* fatal (true) or not (false).
714	* @param fLeaveFilesOpen If set, all the verfied files are left open.
715	* @param pszProgName Optional program name. This is used by SUPR3HardenedMain
716	* to verify that both the executable and corresponding
717	* DLL/DYLIB/SO are valid.
718	*/
719	DECLHIDDEN(int) supR3HardenedVerifyAll(bool fFatal, bool fLeaveFilesOpen, const char *pszProgName)
720	{
721	/*
722	* The verify all the files.
723	*/
724	int rc = VINF_SUCCESS;
725	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
726	{
727	int rc2 = supR3HardenedVerifyFileInternal(iFile, fFatal, fLeaveFilesOpen);
728	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
729	rc = rc2;
730	}
731
732	/*
733	* Verify the program name if specified, that is to say, just check that
734	* it's in the table (=> we've already verified it).
735	*/
736	if (pszProgName)
737	{
738	int rc2 = supR3HardenedVerifyProgram(pszProgName, fFatal);
739	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
740	rc2 = rc;
741	}
742
743	return rc;
744	}
745
746
747	/**
748	* Gets the pre-init data for the hand-over to the other version
749	* of this code.
750	*
751	* The reason why we pass this information on is that it contains
752	* open directories and files. Later it may include even more info
753	* (int the verified arrays mostly).
754	*
755	* The receiver is supR3HardenedRecvPreInitData.
756	*
757	* @param pPreInitData Where to store it.
758	*/
759	DECLHIDDEN(void) supR3HardenedGetPreInitData(PSUPPREINITDATA pPreInitData)
760	{
761	pPreInitData->cInstallFiles = RT_ELEMENTS(g_aSupInstallFiles);
762	pPreInitData->paInstallFiles = &g_aSupInstallFiles[0];
763	pPreInitData->paVerifiedFiles = &g_aSupVerifiedFiles[0];
764
765	pPreInitData->cVerifiedDirs = RT_ELEMENTS(g_aSupVerifiedDirs);
766	pPreInitData->paVerifiedDirs = &g_aSupVerifiedDirs[0];
767	}
768
769
770	/**
771	* Receives the pre-init data from the static executable stub.
772	*
773	* @returns VBox status code. Will not bitch on failure since the
774	* runtime isn't ready for it, so that is left to the exe stub.
775	*
776	* @param pPreInitData The hand-over data.
777	*/
778	DECLHIDDEN(int) supR3HardenedRecvPreInitData(PCSUPPREINITDATA pPreInitData)
779	{
780	/*
781	* Compare the array lengths and the contents of g_aSupInstallFiles.
782	*/
783	if ( pPreInitData->cInstallFiles != RT_ELEMENTS(g_aSupInstallFiles)
784	\|\| pPreInitData->cVerifiedDirs != RT_ELEMENTS(g_aSupVerifiedDirs))
785	return VERR_VERSION_MISMATCH;
786	SUPINSTFILE const *paInstallFiles = pPreInitData->paInstallFiles;
787	for (unsigned iFile = 0; iFile < RT_ELEMENTS(g_aSupInstallFiles); iFile++)
788	if ( g_aSupInstallFiles[iFile].enmDir != paInstallFiles[iFile].enmDir
789	\|\| g_aSupInstallFiles[iFile].enmType != paInstallFiles[iFile].enmType
790	\|\| g_aSupInstallFiles[iFile].fOptional != paInstallFiles[iFile].fOptional
791	\|\| strcmp(g_aSupInstallFiles[iFile].pszFile, paInstallFiles[iFile].pszFile))
792	return VERR_VERSION_MISMATCH;
793
794	/*
795	* Check that we're not called out of order.
796	* If dynamic linking it screwed up, we may end up here.
797	*/
798	if ( ASMMemIsAll8(&g_aSupVerifiedFiles[0], sizeof(g_aSupVerifiedFiles), 0) != NULL
799	\|\| ASMMemIsAll8(&g_aSupVerifiedDirs[0], sizeof(g_aSupVerifiedDirs), 0) != NULL)
800	return VERR_WRONG_ORDER;
801
802	/*
803	* Copy the verification data over.
804	*/
805	memcpy(&g_aSupVerifiedFiles[0], pPreInitData->paVerifiedFiles, sizeof(g_aSupVerifiedFiles));
806	memcpy(&g_aSupVerifiedDirs[0], pPreInitData->paVerifiedDirs, sizeof(g_aSupVerifiedDirs));
807	return VINF_SUCCESS;
808	}

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source: vbox/trunk/src/VBox/HostDrivers/Support/SUPR3HardenedVerify.cpp@ 17935

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