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SecurityPkg: remove PE/COFF header workaround for ELILO on IPF
[mirror_edk2.git] / SecurityPkg / Tcg / Tcg2Dxe / MeasureBootPeCoff.c
1 /** @file
2 This module implements measuring PeCoff image for Tcg2 Protocol.
3
4 Caution: This file requires additional review when modified.
5 This driver will have external input - PE/COFF image.
6 This external input must be validated carefully to avoid security issue like
7 buffer overflow, integer overflow.
8
9 Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
10 This program and the accompanying materials
11 are licensed and made available under the terms and conditions of the BSD License
12 which accompanies this distribution. The full text of the license may be found at
13 http://opensource.org/licenses/bsd-license.php
14
15 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
16 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17
18 **/
19
20 #include <PiDxe.h>
21
22 #include <Library/BaseLib.h>
23 #include <Library/DebugLib.h>
24 #include <Library/BaseMemoryLib.h>
25 #include <Library/MemoryAllocationLib.h>
26 #include <Library/DevicePathLib.h>
27 #include <Library/UefiBootServicesTableLib.h>
28 #include <Library/PeCoffLib.h>
29 #include <Library/Tpm2CommandLib.h>
30 #include <Library/HashLib.h>
31
32 UINTN mTcg2DxeImageSize = 0;
33
34 /**
35 Reads contents of a PE/COFF image in memory buffer.
36
37 Caution: This function may receive untrusted input.
38 PE/COFF image is external input, so this function will make sure the PE/COFF image content
39 read is within the image buffer.
40
41 @param FileHandle Pointer to the file handle to read the PE/COFF image.
42 @param FileOffset Offset into the PE/COFF image to begin the read operation.
43 @param ReadSize On input, the size in bytes of the requested read operation.
44 On output, the number of bytes actually read.
45 @param Buffer Output buffer that contains the data read from the PE/COFF image.
46
47 @retval EFI_SUCCESS The specified portion of the PE/COFF image was read and the size
48 **/
49 EFI_STATUS
50 EFIAPI
51 Tcg2DxeImageRead (
52 IN VOID *FileHandle,
53 IN UINTN FileOffset,
54 IN OUT UINTN *ReadSize,
55 OUT VOID *Buffer
56 )
57 {
58 UINTN EndPosition;
59
60 if (FileHandle == NULL || ReadSize == NULL || Buffer == NULL) {
61 return EFI_INVALID_PARAMETER;
62 }
63
64 if (MAX_ADDRESS - FileOffset < *ReadSize) {
65 return EFI_INVALID_PARAMETER;
66 }
67
68 EndPosition = FileOffset + *ReadSize;
69 if (EndPosition > mTcg2DxeImageSize) {
70 *ReadSize = (UINT32)(mTcg2DxeImageSize - FileOffset);
71 }
72
73 if (FileOffset >= mTcg2DxeImageSize) {
74 *ReadSize = 0;
75 }
76
77 CopyMem (Buffer, (UINT8 *)((UINTN) FileHandle + FileOffset), *ReadSize);
78
79 return EFI_SUCCESS;
80 }
81
82 /**
83 Measure PE image into TPM log based on the authenticode image hashing in
84 PE/COFF Specification 8.0 Appendix A.
85
86 Caution: This function may receive untrusted input.
87 PE/COFF image is external input, so this function will validate its data structure
88 within this image buffer before use.
89
90 Notes: PE/COFF image is checked by BasePeCoffLib PeCoffLoaderGetImageInfo().
91
92 @param[in] PCRIndex TPM PCR index
93 @param[in] ImageAddress Start address of image buffer.
94 @param[in] ImageSize Image size
95 @param[out] DigestList Digeest list of this image.
96
97 @retval EFI_SUCCESS Successfully measure image.
98 @retval EFI_OUT_OF_RESOURCES No enough resource to measure image.
99 @retval other error value
100 **/
101 EFI_STATUS
102 MeasurePeImageAndExtend (
103 IN UINT32 PCRIndex,
104 IN EFI_PHYSICAL_ADDRESS ImageAddress,
105 IN UINTN ImageSize,
106 OUT TPML_DIGEST_VALUES *DigestList
107 )
108 {
109 EFI_STATUS Status;
110 EFI_IMAGE_DOS_HEADER *DosHdr;
111 UINT32 PeCoffHeaderOffset;
112 EFI_IMAGE_SECTION_HEADER *Section;
113 UINT8 *HashBase;
114 UINTN HashSize;
115 UINTN SumOfBytesHashed;
116 EFI_IMAGE_SECTION_HEADER *SectionHeader;
117 UINTN Index;
118 UINTN Pos;
119 EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
120 UINT32 NumberOfRvaAndSizes;
121 UINT32 CertSize;
122 HASH_HANDLE HashHandle;
123 PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;
124
125 HashHandle = 0xFFFFFFFF; // Know bad value
126
127 Status = EFI_UNSUPPORTED;
128 SectionHeader = NULL;
129
130 //
131 // Check PE/COFF image
132 //
133 ZeroMem (&ImageContext, sizeof (ImageContext));
134 ImageContext.Handle = (VOID *) (UINTN) ImageAddress;
135 mTcg2DxeImageSize = ImageSize;
136 ImageContext.ImageRead = (PE_COFF_LOADER_READ_FILE) Tcg2DxeImageRead;
137
138 //
139 // Get information about the image being loaded
140 //
141 Status = PeCoffLoaderGetImageInfo (&ImageContext);
142 if (EFI_ERROR (Status)) {
143 //
144 // The information can't be got from the invalid PeImage
145 //
146 DEBUG ((DEBUG_INFO, "Tcg2Dxe: PeImage invalid. Cannot retrieve image information.\n"));
147 goto Finish;
148 }
149
150 DosHdr = (EFI_IMAGE_DOS_HEADER *) (UINTN) ImageAddress;
151 PeCoffHeaderOffset = 0;
152 if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
153 PeCoffHeaderOffset = DosHdr->e_lfanew;
154 }
155
156 Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset);
157 if (Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {
158 Status = EFI_UNSUPPORTED;
159 goto Finish;
160 }
161
162 //
163 // PE/COFF Image Measurement
164 //
165 // NOTE: The following codes/steps are based upon the authenticode image hashing in
166 // PE/COFF Specification 8.0 Appendix A.
167 //
168 //
169
170 // 1. Load the image header into memory.
171
172 // 2. Initialize a SHA hash context.
173
174 Status = HashStart (&HashHandle);
175 if (EFI_ERROR (Status)) {
176 goto Finish;
177 }
178
179 //
180 // Measuring PE/COFF Image Header;
181 // But CheckSum field and SECURITY data directory (certificate) are excluded
182 //
183
184 //
185 // 3. Calculate the distance from the base of the image header to the image checksum address.
186 // 4. Hash the image header from its base to beginning of the image checksum.
187 //
188 HashBase = (UINT8 *) (UINTN) ImageAddress;
189 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
190 //
191 // Use PE32 offset
192 //
193 NumberOfRvaAndSizes = Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes;
194 HashSize = (UINTN) (&Hdr.Pe32->OptionalHeader.CheckSum) - (UINTN) HashBase;
195 } else {
196 //
197 // Use PE32+ offset
198 //
199 NumberOfRvaAndSizes = Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes;
200 HashSize = (UINTN) (&Hdr.Pe32Plus->OptionalHeader.CheckSum) - (UINTN) HashBase;
201 }
202
203 Status = HashUpdate (HashHandle, HashBase, HashSize);
204 if (EFI_ERROR (Status)) {
205 goto Finish;
206 }
207
208 //
209 // 5. Skip over the image checksum (it occupies a single ULONG).
210 //
211 if (NumberOfRvaAndSizes <= EFI_IMAGE_DIRECTORY_ENTRY_SECURITY) {
212 //
213 // 6. Since there is no Cert Directory in optional header, hash everything
214 // from the end of the checksum to the end of image header.
215 //
216 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
217 //
218 // Use PE32 offset.
219 //
220 HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);
221 HashSize = Hdr.Pe32->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);
222 } else {
223 //
224 // Use PE32+ offset.
225 //
226 HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);
227 HashSize = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);
228 }
229
230 if (HashSize != 0) {
231 Status = HashUpdate (HashHandle, HashBase, HashSize);
232 if (EFI_ERROR (Status)) {
233 goto Finish;
234 }
235 }
236 } else {
237 //
238 // 7. Hash everything from the end of the checksum to the start of the Cert Directory.
239 //
240 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
241 //
242 // Use PE32 offset
243 //
244 HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);
245 HashSize = (UINTN) (&Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - (UINTN) HashBase;
246 } else {
247 //
248 // Use PE32+ offset
249 //
250 HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);
251 HashSize = (UINTN) (&Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - (UINTN) HashBase;
252 }
253
254 if (HashSize != 0) {
255 Status = HashUpdate (HashHandle, HashBase, HashSize);
256 if (EFI_ERROR (Status)) {
257 goto Finish;
258 }
259 }
260
261 //
262 // 8. Skip over the Cert Directory. (It is sizeof(IMAGE_DATA_DIRECTORY) bytes.)
263 // 9. Hash everything from the end of the Cert Directory to the end of image header.
264 //
265 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
266 //
267 // Use PE32 offset
268 //
269 HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];
270 HashSize = Hdr.Pe32->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);
271 } else {
272 //
273 // Use PE32+ offset
274 //
275 HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];
276 HashSize = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);
277 }
278
279 if (HashSize != 0) {
280 Status = HashUpdate (HashHandle, HashBase, HashSize);
281 if (EFI_ERROR (Status)) {
282 goto Finish;
283 }
284 }
285 }
286
287 //
288 // 10. Set the SUM_OF_BYTES_HASHED to the size of the header
289 //
290 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
291 //
292 // Use PE32 offset
293 //
294 SumOfBytesHashed = Hdr.Pe32->OptionalHeader.SizeOfHeaders;
295 } else {
296 //
297 // Use PE32+ offset
298 //
299 SumOfBytesHashed = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders;
300 }
301
302 //
303 // 11. Build a temporary table of pointers to all the IMAGE_SECTION_HEADER
304 // structures in the image. The 'NumberOfSections' field of the image
305 // header indicates how big the table should be. Do not include any
306 // IMAGE_SECTION_HEADERs in the table whose 'SizeOfRawData' field is zero.
307 //
308 SectionHeader = (EFI_IMAGE_SECTION_HEADER *) AllocateZeroPool (sizeof (EFI_IMAGE_SECTION_HEADER) * Hdr.Pe32->FileHeader.NumberOfSections);
309 if (SectionHeader == NULL) {
310 Status = EFI_OUT_OF_RESOURCES;
311 goto Finish;
312 }
313
314 //
315 // 12. Using the 'PointerToRawData' in the referenced section headers as
316 // a key, arrange the elements in the table in ascending order. In other
317 // words, sort the section headers according to the disk-file offset of
318 // the section.
319 //
320 Section = (EFI_IMAGE_SECTION_HEADER *) (
321 (UINT8 *) (UINTN) ImageAddress +
322 PeCoffHeaderOffset +
323 sizeof(UINT32) +
324 sizeof(EFI_IMAGE_FILE_HEADER) +
325 Hdr.Pe32->FileHeader.SizeOfOptionalHeader
326 );
327 for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {
328 Pos = Index;
329 while ((Pos > 0) && (Section->PointerToRawData < SectionHeader[Pos - 1].PointerToRawData)) {
330 CopyMem (&SectionHeader[Pos], &SectionHeader[Pos - 1], sizeof(EFI_IMAGE_SECTION_HEADER));
331 Pos--;
332 }
333 CopyMem (&SectionHeader[Pos], Section, sizeof(EFI_IMAGE_SECTION_HEADER));
334 Section += 1;
335 }
336
337 //
338 // 13. Walk through the sorted table, bring the corresponding section
339 // into memory, and hash the entire section (using the 'SizeOfRawData'
340 // field in the section header to determine the amount of data to hash).
341 // 14. Add the section's 'SizeOfRawData' to SUM_OF_BYTES_HASHED .
342 // 15. Repeat steps 13 and 14 for all the sections in the sorted table.
343 //
344 for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {
345 Section = (EFI_IMAGE_SECTION_HEADER *) &SectionHeader[Index];
346 if (Section->SizeOfRawData == 0) {
347 continue;
348 }
349 HashBase = (UINT8 *) (UINTN) ImageAddress + Section->PointerToRawData;
350 HashSize = (UINTN) Section->SizeOfRawData;
351
352 Status = HashUpdate (HashHandle, HashBase, HashSize);
353 if (EFI_ERROR (Status)) {
354 goto Finish;
355 }
356
357 SumOfBytesHashed += HashSize;
358 }
359
360 //
361 // 16. If the file size is greater than SUM_OF_BYTES_HASHED, there is extra
362 // data in the file that needs to be added to the hash. This data begins
363 // at file offset SUM_OF_BYTES_HASHED and its length is:
364 // FileSize - (CertDirectory->Size)
365 //
366 if (ImageSize > SumOfBytesHashed) {
367 HashBase = (UINT8 *) (UINTN) ImageAddress + SumOfBytesHashed;
368
369 if (NumberOfRvaAndSizes <= EFI_IMAGE_DIRECTORY_ENTRY_SECURITY) {
370 CertSize = 0;
371 } else {
372 if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
373 //
374 // Use PE32 offset.
375 //
376 CertSize = Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size;
377 } else {
378 //
379 // Use PE32+ offset.
380 //
381 CertSize = Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size;
382 }
383 }
384
385 if (ImageSize > CertSize + SumOfBytesHashed) {
386 HashSize = (UINTN) (ImageSize - CertSize - SumOfBytesHashed);
387
388 Status = HashUpdate (HashHandle, HashBase, HashSize);
389 if (EFI_ERROR (Status)) {
390 goto Finish;
391 }
392 } else if (ImageSize < CertSize + SumOfBytesHashed) {
393 Status = EFI_UNSUPPORTED;
394 goto Finish;
395 }
396 }
397
398 //
399 // 17. Finalize the SHA hash.
400 //
401 Status = HashCompleteAndExtend (HashHandle, PCRIndex, NULL, 0, DigestList);
402 if (EFI_ERROR (Status)) {
403 goto Finish;
404 }
405
406 Finish:
407 if (SectionHeader != NULL) {
408 FreePool (SectionHeader);
409 }
410
411 return Status;
412 }
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