VBoxCheckImports.cpp@ 59628

Last change on this file since 59628 was 59404, checked in by vboxsync, 9 years ago

Forward-ported r104938, r104943, r104950, r104952, r104953, r104987, r104988, r104990 from 5.0:

VBoxStub: Lazy import DLLs not in the KnownDlls list (and then some) and check that we don't accidentally add new imports as time goes by.
VBoxStub: the dlls have export names, so use them instead of the ordinals.
VBoxDef2LazyLoad fixes and error reporting, fixed missing VBoxCheckImports dependency during use in VBoxStub.
iprt/initterm.h,vbox-img,VBoxStub: Introduced RTR3INIT_FLAGS_STANDALONE_APP for statically linked applications that are expected to run outside the normal VirtualBox installation directory and need to be on their toes wrt dynamic library search paths. (Only windows, really.) Also, _always_ initialize IPRT first, don't ever do anything before that unless it 104% must be done there.
RTR3INIT_FLAGS_STANDALONE_APP trumps concerns about Vista GUI

Property svn:eol-style set to native
Property svn:keywords set to Author Date Id Revision

File size: 11.8 KB

Line
1	/* $Id: VBoxCheckImports.cpp 59404 2016-01-19 10:10:39Z vboxsync $ */
2	/** @file
3	* IPRT - Checks that a windows image only imports from a given set of DLLs.
4	*/
5
6	/*
7	* Copyright (C) 2012-2015 Oracle Corporation
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
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#include <iprt/formats/mz.h>
23	#include <iprt/formats/pecoff.h>
24	#include <stdio.h>
25	#include <stdlib.h>
26	#include <string.h>
27
28
29	/*********************************************************************************************************************************
30	* Structures and Typedefs *
31	*********************************************************************************************************************************/
32	typedef struct
33	{
34	const char *pszImage;
35	FILE *pFile;
36	bool f32Bit;
37	union
38	{
39	IMAGE_NT_HEADERS32 Nt32;
40	IMAGE_NT_HEADERS64 Nt64;
41	} Hdrs;
42
43	uint32_t cSections;
44	PIMAGE_SECTION_HEADER paSections;
45	} MYIMAGE;
46
47
48	static bool Failed(MYIMAGE pThis, const char pszFmt, ...)
49	{
50	va_list va;
51	fprintf(stderr, "error '%s': ", pThis->pszImage);
52	va_start(va, pszFmt);
53	vfprintf(stderr, pszFmt, va);
54	va_end(va);
55	fprintf(stderr, "\n");
56	return false;
57	}
58
59
60	static bool ReadPeHeaders(MYIMAGE *pThis)
61	{
62	/*
63	* MZ header.
64	*/
65	IMAGE_DOS_HEADER MzHdr;
66	if (fread(&MzHdr, sizeof(MzHdr), 1, pThis->pFile) != 1)
67	return Failed(pThis, "Reading DOS header");
68
69	if (MzHdr.e_magic != IMAGE_DOS_SIGNATURE)
70	return Failed(pThis, "No MZ magic (found %#x)", MzHdr.e_magic);
71
72	if (fseek(pThis->pFile, MzHdr.e_lfanew, SEEK_SET) != 0)
73	return Failed(pThis, "Seeking to %#lx", (unsigned long)MzHdr.e_lfanew);
74
75	/*
76	* NT signature + file header.
77	*/
78	if (fread(&pThis->Hdrs.Nt32, offsetof(IMAGE_NT_HEADERS32, OptionalHeader), 1, pThis->pFile) != 1)
79	return Failed(pThis, "Reading NT file header");
80
81	if (pThis->Hdrs.Nt32.Signature != IMAGE_NT_SIGNATURE)
82	return Failed(pThis, "No PE magic (found %#x)", pThis->Hdrs.Nt32.Signature);
83
84	if (pThis->Hdrs.Nt32.FileHeader.SizeOfOptionalHeader == sizeof(pThis->Hdrs.Nt32.OptionalHeader))
85	pThis->f32Bit = true;
86	else if (pThis->Hdrs.Nt32.FileHeader.SizeOfOptionalHeader == sizeof(pThis->Hdrs.Nt64.OptionalHeader))
87	pThis->f32Bit = false;
88	else
89	return Failed(pThis, "Unsupported SizeOfOptionalHeaders value: %#x",
90	pThis->Hdrs.Nt32.FileHeader.SizeOfOptionalHeader);
91
92	/*
93	* NT optional header.
94	*/
95	if (fread(&pThis->Hdrs.Nt32.OptionalHeader, pThis->Hdrs.Nt32.FileHeader.SizeOfOptionalHeader, 1, pThis->pFile) != 1)
96	return Failed(pThis, "Reading NT optional header");
97
98	if ( pThis->Hdrs.Nt32.OptionalHeader.Magic
99	!= (pThis->f32Bit ? IMAGE_NT_OPTIONAL_HDR32_MAGIC : IMAGE_NT_OPTIONAL_HDR64_MAGIC) )
100	return Failed(pThis, "Bad optional header magic: %#x", pThis->Hdrs.Nt32.OptionalHeader.Magic);
101
102	uint32_t NumberOfRvaAndSizes = pThis->f32Bit
103	? pThis->Hdrs.Nt32.OptionalHeader.NumberOfRvaAndSizes
104	: pThis->Hdrs.Nt64.OptionalHeader.NumberOfRvaAndSizes;
105	if (NumberOfRvaAndSizes != IMAGE_NUMBEROF_DIRECTORY_ENTRIES)
106	return Failed(pThis, "Unsupported NumberOfRvaAndSizes value: %#x", NumberOfRvaAndSizes);
107
108	/*
109	* Read the section table.
110	*/
111	pThis->cSections = pThis->Hdrs.Nt32.FileHeader.NumberOfSections;
112	if (!pThis->cSections)
113	return Failed(pThis, "No sections in image!");
114	pThis->paSections = (PIMAGE_SECTION_HEADER)calloc(sizeof(pThis->paSections[0]), pThis->cSections);
115	if (!pThis->paSections)
116	return Failed(pThis, "Out of memory!");
117	if (fread(pThis->paSections, sizeof(pThis->paSections[0]), pThis->cSections, pThis->pFile) != pThis->cSections)
118	return Failed(pThis, "Reading NT section headers");
119
120
121	return true;
122	}
123
124
125	static bool ReadAtRva(MYIMAGE pThis, uint32_t uRva, void pvBuf, size_t cbToRead)
126	{
127	unsigned const uRvaOrg = uRva;
128	size_t const cbToReadOrg = cbToRead;
129
130	/*
131	* Header section.
132	*/
133	int iSh = -1;
134	uint32_t uSectRva = 0;
135	uint32_t offSectRaw = 0;
136	uint32_t cbSectRaw = pThis->f32Bit
137	? pThis->Hdrs.Nt32.OptionalHeader.SizeOfHeaders
138	: pThis->Hdrs.Nt64.OptionalHeader.SizeOfHeaders;
139	uint32_t cbSectMax = pThis->paSections[0].VirtualAddress;
140
141	for (;;)
142	{
143	/* Read if we've got a match. */
144	uint32_t off = uRva - uSectRva;
145	if (off < cbSectMax)
146	{
147	uint32_t cbThis = cbSectMax - off;
148	if (cbThis > cbToRead)
149	cbThis = (uint32_t)cbToRead;
150
151	memset(pvBuf, 0, cbThis);
152
153	if (off < cbSectRaw)
154	{
155	if (fseek(pThis->pFile, offSectRaw + off, SEEK_SET) != 0)
156	return Failed(pThis, "Seeking to %#x", offSectRaw + off);
157	if (fread(pvBuf, RT_MIN(cbThis, cbSectRaw - off), 1, pThis->pFile) != 1)
158	return Failed(pThis, "Reading %u bytes at %#x", RT_MIN(cbThis, cbSectRaw - off), offSectRaw + off);
159	}
160
161	cbToRead -= cbThis;
162	if (!cbToRead)
163	return true;
164	pvBuf = (uint8_t *)pvBuf + cbThis;
165	}
166
167	/* next section */
168	iSh++;
169	if ((unsigned)iSh >= pThis->cSections)
170	return Failed(pThis, "RVA %#x LB %u is outside the image", uRvaOrg, cbToReadOrg);
171	uSectRva = pThis->paSections[iSh].VirtualAddress;
172	offSectRaw = pThis->paSections[iSh].PointerToRawData;
173	cbSectRaw = pThis->paSections[iSh].SizeOfRawData;
174	if ((unsigned)iSh + 1 < pThis->cSections)
175	cbSectMax = pThis->paSections[iSh + 1].VirtualAddress - uSectRva;
176	else
177	cbSectMax = pThis->paSections[iSh].Misc.VirtualSize;
178	}
179	}
180
181
182	static bool ReadStringAtRva(MYIMAGE pThis, uint32_t uRva, char pszBuf, size_t cbMax)
183	{
184	uint32_t const uRvaOrg = uRva;
185
186	/*
187	* Try read the whole string at once.
188	*/
189	uint32_t cbImage = pThis->f32Bit
190	? pThis->Hdrs.Nt32.OptionalHeader.SizeOfImage
191	: pThis->Hdrs.Nt64.OptionalHeader.SizeOfImage;
192	uint32_t cbThis = uRva < cbImage ? cbImage - uRva : 1;
193	if (cbThis > cbMax)
194	cbThis = (uint32_t)cbMax;
195	if (!ReadAtRva(pThis, uRva, pszBuf, cbThis))
196	return false;
197	if (memchr(pszBuf, 0, cbThis) != NULL)
198	return true;
199
200	/*
201	* Read more, byte-by-byte.
202	*/
203	for (;;)
204	{
205	cbMax -= cbThis;
206	if (!cbMax)
207	return Failed(pThis, "String to long at %#x", uRvaOrg);
208	pszBuf += cbThis;
209	uRva += cbThis;
210
211	cbThis = 1;
212	if (!ReadAtRva(pThis, uRva, pszBuf, cbThis))
213	return false;
214	if (!*pszBuf)
215	return true;
216	}
217	}
218
219
220	static void ReadAtRvaAlloc(MYIMAGE pThis, uint32_t uRva, size_t cbToRead)
221	{
222	void *pvBuf = malloc(cbToRead);
223	if (pvBuf)
224	{
225	if (ReadAtRva(pThis, uRva, pvBuf, cbToRead))
226	return pvBuf;
227	free(pvBuf);
228	}
229	else
230	Failed(pThis, "Out of memory!");
231	return NULL;
232	}
233
234
235	static bool ParseAndCheckImports(MYIMAGE pThis, const char *papszAllowed, unsigned cAllowed)
236	{
237	/*
238	* Do we have an import directory? If so, read it.
239	*/
240	IMAGE_DATA_DIRECTORY ImpDir = pThis->f32Bit
241	? pThis->Hdrs.Nt32.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
242	: pThis->Hdrs.Nt64.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
243	if (ImpDir.Size == 0)
244	return true;
245
246	uint32_t cImps = ImpDir.Size / sizeof(IMAGE_IMPORT_DESCRIPTOR);
247	if (cImps * sizeof(IMAGE_IMPORT_DESCRIPTOR) != ImpDir.Size)
248	return Failed(pThis, "Import directory size is not a multiple of IMAGE_IMPORT_DESCRIPTOR: %#x", ImpDir.Size);
249
250	PIMAGE_IMPORT_DESCRIPTOR paImps = (PIMAGE_IMPORT_DESCRIPTOR)ReadAtRvaAlloc(pThis, ImpDir.VirtualAddress, ImpDir.Size);
251	if (!paImps)
252	return false;
253
254	/* There is usually an empty entry at the end. */
255	if ( paImps[cImps - 1].Name == 0
256	\|\| paImps[cImps - 1].FirstThunk == 0)
257	cImps--;
258
259	/*
260	* Do the processing.
261	*/
262	bool fRc = true;
263	for (uint32_t i = 0; i < cImps; i++)
264	{
265	/* Read the import name string. */
266	char szName[128];
267	if (!ReadStringAtRva(pThis, paImps[i].Name, szName, sizeof(szName)))
268	{
269	fRc = false;
270	break;
271	}
272
273	/* Check it against the list of allowed DLLs. */
274	bool fFound = false;
275	unsigned j = cAllowed;
276	while (j-- > 0)
277	if (stricmp(papszAllowed[j], szName) == 0)
278	{
279	fFound = true;
280	break;
281	}
282	if (!fFound)
283	fRc = Failed(pThis, "Illegal import: '%s'", szName);
284	}
285
286	free(paImps);
287	return fRc;
288	}
289
290
291	static int usage(const char *argv0)
292	{
293	printf("usage: %s --image <image> [allowed-dll [..]]\n");
294	return RTEXITCODE_SUCCESS;
295	}
296
297
298	int main(int argc, char **argv)
299	{
300	/*
301	* Parse arguments.
302	*/
303	const char *pszImage = NULL;
304	const char papszAllowed = (const char )calloc(argc, sizeof(const char *));
305	unsigned cAllowed = 0;
306
307	for (int i = 1; i < argc; i++)
308	{
309	const char *psz = argv[i];
310	if (*psz == '-')
311	{
312	if (!strcmp(psz, "--image") \|\| !strcmp(psz, "-i"))
313	{
314	if (++i >= argc)
315	{
316	fprintf(stderr, "syntax error: File name expected after '%s'.\n", psz);
317	return RTEXITCODE_SYNTAX;
318	}
319	pszImage = argv[i];
320	}
321	else if ( !strcmp(psz, "--help")
322	\|\| !strcmp(psz, "-help")
323	\|\| !strcmp(psz, "-h")
324	\|\| !strcmp(psz, "-?") )
325	return usage(argv[0]);
326	else if ( !strcmp(psz, "--version")
327	\|\| !strcmp(psz, "-V"))
328	{
329	printf("$Revision: 59404 $\n");
330	return RTEXITCODE_SUCCESS;
331	}
332	else
333	{
334	fprintf(stderr, "syntax error: Unknown option '%s'.\n", psz);
335	return RTEXITCODE_SYNTAX;
336	}
337	}
338	else
339	papszAllowed[cAllowed++] = argv[i];
340	}
341
342	if (!pszImage)
343	{
344	fprintf(stderr, "syntax error: No input file specified.\n");
345	return RTEXITCODE_SYNTAX;
346	}
347
348	/*
349	* Open the image and process headers.
350	*/
351	RTEXITCODE rcExit = RTEXITCODE_FAILURE;
352	MYIMAGE MyImage;
353	memset(&MyImage, 0, sizeof(MyImage));
354	MyImage.pszImage = pszImage;
355	MyImage.pFile = fopen(pszImage, "rb");
356	if (MyImage.pFile)
357	{
358	if ( ReadPeHeaders(&MyImage)
359	&& ParseAndCheckImports(&MyImage, papszAllowed, cAllowed))
360	rcExit = RTEXITCODE_SUCCESS;
361
362	fclose(MyImage.pFile);
363	free(MyImage.paSections);
364	}
365	else
366	Failed(&MyImage, "Failed to open image for binary reading.");
367
368	return rcExit;
369	}
370
371

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source: vbox/trunk/src/bldprogs/VBoxCheckImports.cpp@ 59628

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