0c18794e |
1 | /** @file\r |
2 | The library instance provides security service of TPM measure boot. \r |
3 | \r |
4 | Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>\r |
5 | This program and the accompanying materials \r |
6 | are licensed and made available under the terms and conditions of the BSD License \r |
7 | which accompanies this distribution. The full text of the license may be found at \r |
8 | http://opensource.org/licenses/bsd-license.php\r |
9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
12 | \r |
13 | **/\r |
14 | \r |
15 | #include <PiDxe.h>\r |
16 | \r |
17 | #include <Protocol/TcgService.h>\r |
18 | #include <Protocol/FirmwareVolume2.h>\r |
19 | #include <Protocol/BlockIo.h>\r |
20 | #include <Protocol/DiskIo.h>\r |
21 | #include <Protocol/DevicePathToText.h>\r |
22 | \r |
23 | #include <Library/BaseLib.h>\r |
24 | #include <Library/DebugLib.h>\r |
25 | #include <Library/BaseMemoryLib.h>\r |
26 | #include <Library/MemoryAllocationLib.h>\r |
27 | #include <Library/DevicePathLib.h>\r |
28 | #include <Library/UefiBootServicesTableLib.h>\r |
29 | #include <Library/BaseCryptLib.h>\r |
30 | #include <Library/PeCoffLib.h>\r |
31 | #include <Library/SecurityManagementLib.h>\r |
32 | \r |
33 | //\r |
34 | // Flag to check GPT partition. It only need be measured once.\r |
35 | //\r |
36 | BOOLEAN mMeasureGptTableFlag = FALSE;\r |
37 | EFI_GUID mZeroGuid = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}};\r |
38 | UINTN mMeasureGptCount = 0;\r |
39 | \r |
40 | /**\r |
41 | Reads contents of a PE/COFF image in memory buffer.\r |
42 | \r |
43 | @param FileHandle Pointer to the file handle to read the PE/COFF image.\r |
44 | @param FileOffset Offset into the PE/COFF image to begin the read operation.\r |
45 | @param ReadSize On input, the size in bytes of the requested read operation. \r |
46 | On output, the number of bytes actually read.\r |
47 | @param Buffer Output buffer that contains the data read from the PE/COFF image.\r |
48 | \r |
49 | @retval EFI_SUCCESS The specified portion of the PE/COFF image was read and the size \r |
50 | **/\r |
51 | EFI_STATUS\r |
52 | EFIAPI\r |
53 | ImageRead (\r |
54 | IN VOID *FileHandle,\r |
55 | IN UINTN FileOffset,\r |
56 | IN OUT UINTN *ReadSize,\r |
57 | OUT VOID *Buffer\r |
58 | )\r |
59 | {\r |
60 | CopyMem (Buffer, (UINT8 *)((UINTN) FileHandle + FileOffset), *ReadSize);\r |
61 | return EFI_SUCCESS;\r |
62 | }\r |
63 | \r |
64 | /**\r |
65 | Measure GPT table data into TPM log.\r |
66 | \r |
67 | @param TcgProtocol Pointer to the located TCG protocol instance.\r |
68 | @param GptHandle Handle that GPT partition was installed.\r |
69 | \r |
70 | @retval EFI_SUCCESS Successfully measure GPT table.\r |
71 | @retval EFI_UNSUPPORTED Not support GPT table on the given handle.\r |
72 | @retval EFI_DEVICE_ERROR Can't get GPT table because device error.\r |
73 | @retval EFI_OUT_OF_RESOURCES No enough resource to measure GPT table.\r |
74 | @retval other error value\r |
75 | **/\r |
76 | EFI_STATUS\r |
77 | EFIAPI\r |
78 | TcgMeasureGptTable (\r |
79 | IN EFI_TCG_PROTOCOL *TcgProtocol,\r |
80 | IN EFI_HANDLE GptHandle\r |
81 | )\r |
82 | {\r |
83 | EFI_STATUS Status;\r |
84 | EFI_BLOCK_IO_PROTOCOL *BlockIo;\r |
85 | EFI_DISK_IO_PROTOCOL *DiskIo;\r |
86 | EFI_PARTITION_TABLE_HEADER *PrimaryHeader;\r |
87 | EFI_PARTITION_ENTRY *PartitionEntry;\r |
88 | UINT8 *EntryPtr;\r |
89 | UINTN NumberOfPartition;\r |
90 | UINT32 Index;\r |
91 | TCG_PCR_EVENT *TcgEvent;\r |
92 | EFI_GPT_DATA *GptData;\r |
93 | UINT32 EventSize;\r |
94 | UINT32 EventNumber;\r |
95 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
96 | \r |
97 | if (mMeasureGptCount > 0) {\r |
98 | return EFI_SUCCESS;\r |
99 | }\r |
100 | \r |
101 | Status = gBS->HandleProtocol (GptHandle, &gEfiBlockIoProtocolGuid, (VOID**)&BlockIo);\r |
102 | if (EFI_ERROR (Status)) {\r |
103 | return EFI_UNSUPPORTED;\r |
104 | }\r |
105 | Status = gBS->HandleProtocol (GptHandle, &gEfiDiskIoProtocolGuid, (VOID**)&DiskIo);\r |
106 | if (EFI_ERROR (Status)) {\r |
107 | return EFI_UNSUPPORTED;\r |
108 | }\r |
109 | //\r |
110 | // Read the EFI Partition Table Header\r |
111 | // \r |
112 | PrimaryHeader = (EFI_PARTITION_TABLE_HEADER *) AllocatePool (BlockIo->Media->BlockSize);\r |
113 | if (PrimaryHeader == NULL) {\r |
114 | return EFI_OUT_OF_RESOURCES;\r |
115 | } \r |
116 | Status = DiskIo->ReadDisk (\r |
117 | DiskIo,\r |
118 | BlockIo->Media->MediaId,\r |
119 | 1 * BlockIo->Media->BlockSize,\r |
120 | BlockIo->Media->BlockSize,\r |
121 | (UINT8 *)PrimaryHeader\r |
122 | );\r |
123 | if (EFI_ERROR (Status)) {\r |
124 | DEBUG ((EFI_D_ERROR, "Failed to Read Partition Table Header!\n"));\r |
125 | FreePool (PrimaryHeader);\r |
126 | return EFI_DEVICE_ERROR;\r |
127 | } \r |
128 | //\r |
129 | // Read the partition entry.\r |
130 | //\r |
131 | EntryPtr = (UINT8 *)AllocatePool (PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry);\r |
132 | if (EntryPtr == NULL) {\r |
133 | FreePool (PrimaryHeader);\r |
134 | return EFI_OUT_OF_RESOURCES;\r |
135 | }\r |
136 | Status = DiskIo->ReadDisk (\r |
137 | DiskIo,\r |
138 | BlockIo->Media->MediaId,\r |
139 | MultU64x32(PrimaryHeader->PartitionEntryLBA, BlockIo->Media->BlockSize),\r |
140 | PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry,\r |
141 | EntryPtr\r |
142 | );\r |
143 | if (EFI_ERROR (Status)) {\r |
144 | FreePool (PrimaryHeader);\r |
145 | FreePool (EntryPtr);\r |
146 | return EFI_DEVICE_ERROR;\r |
147 | }\r |
148 | \r |
149 | //\r |
150 | // Count the valid partition\r |
151 | //\r |
152 | PartitionEntry = (EFI_PARTITION_ENTRY *)EntryPtr;\r |
153 | NumberOfPartition = 0;\r |
154 | for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {\r |
155 | if (!CompareGuid (&PartitionEntry->PartitionTypeGUID, &mZeroGuid)) {\r |
156 | NumberOfPartition++; \r |
157 | }\r |
158 | PartitionEntry++;\r |
159 | }\r |
160 | \r |
161 | //\r |
162 | // Parepare Data for Measurement\r |
163 | // \r |
164 | EventSize = (UINT32)(sizeof (EFI_GPT_DATA) - sizeof (GptData->Partitions) \r |
165 | + NumberOfPartition * PrimaryHeader->SizeOfPartitionEntry);\r |
166 | TcgEvent = (TCG_PCR_EVENT *) AllocateZeroPool (EventSize + sizeof (TCG_PCR_EVENT));\r |
167 | if (TcgEvent == NULL) {\r |
168 | FreePool (PrimaryHeader);\r |
169 | FreePool (EntryPtr);\r |
170 | return EFI_OUT_OF_RESOURCES;\r |
171 | }\r |
172 | \r |
173 | TcgEvent->PCRIndex = 5;\r |
174 | TcgEvent->EventType = EV_EFI_GPT_EVENT;\r |
175 | TcgEvent->EventSize = EventSize;\r |
176 | GptData = (EFI_GPT_DATA *) TcgEvent->Event; \r |
177 | \r |
178 | //\r |
179 | // Copy the EFI_PARTITION_TABLE_HEADER and NumberOfPartition\r |
180 | // \r |
181 | CopyMem ((UINT8 *)GptData, (UINT8*)PrimaryHeader, sizeof (EFI_PARTITION_TABLE_HEADER));\r |
182 | GptData->NumberOfPartitions = NumberOfPartition;\r |
183 | //\r |
184 | // Copy the valid partition entry\r |
185 | //\r |
186 | PartitionEntry = (EFI_PARTITION_ENTRY*)EntryPtr;\r |
187 | NumberOfPartition = 0;\r |
188 | for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {\r |
189 | if (!CompareGuid (&PartitionEntry->PartitionTypeGUID, &mZeroGuid)) {\r |
190 | CopyMem (\r |
191 | (UINT8 *)&GptData->Partitions + NumberOfPartition * sizeof (EFI_PARTITION_ENTRY),\r |
192 | (UINT8 *)PartitionEntry,\r |
193 | sizeof (EFI_PARTITION_ENTRY)\r |
194 | );\r |
195 | NumberOfPartition++;\r |
196 | }\r |
197 | PartitionEntry++;\r |
198 | }\r |
199 | \r |
200 | //\r |
201 | // Measure the GPT data\r |
202 | //\r |
203 | EventNumber = 1;\r |
204 | Status = TcgProtocol->HashLogExtendEvent (\r |
205 | TcgProtocol,\r |
206 | (EFI_PHYSICAL_ADDRESS) (UINTN) (VOID *) GptData,\r |
207 | (UINT64) TcgEvent->EventSize,\r |
208 | TPM_ALG_SHA,\r |
209 | TcgEvent,\r |
210 | &EventNumber,\r |
211 | &EventLogLastEntry\r |
212 | );\r |
213 | if (!EFI_ERROR (Status)) {\r |
214 | mMeasureGptCount++;\r |
215 | }\r |
216 | \r |
217 | FreePool (PrimaryHeader);\r |
218 | FreePool (EntryPtr);\r |
219 | FreePool (TcgEvent);\r |
220 | \r |
221 | return Status;\r |
222 | }\r |
223 | \r |
224 | /**\r |
225 | Measure PE image into TPM log based on the authenticode image hashing in\r |
226 | PE/COFF Specification 8.0 Appendix A.\r |
227 | \r |
228 | @param[in] TcgProtocol Pointer to the located TCG protocol instance.\r |
229 | @param[in] ImageAddress Start address of image buffer.\r |
230 | @param[in] ImageSize Image size\r |
231 | @param[in] LinkTimeBase Address that the image is loaded into memory.\r |
232 | @param[in] ImageType Image subsystem type.\r |
233 | @param[in] FilePath File path is corresponding to the input image.\r |
234 | \r |
235 | @retval EFI_SUCCESS Successfully measure image.\r |
236 | @retval EFI_OUT_OF_RESOURCES No enough resource to measure image.\r |
237 | @retval other error value\r |
238 | **/\r |
239 | EFI_STATUS\r |
240 | EFIAPI\r |
241 | TcgMeasurePeImage (\r |
242 | IN EFI_TCG_PROTOCOL *TcgProtocol,\r |
243 | IN EFI_PHYSICAL_ADDRESS ImageAddress,\r |
244 | IN UINTN ImageSize,\r |
245 | IN UINTN LinkTimeBase,\r |
246 | IN UINT16 ImageType,\r |
247 | IN EFI_DEVICE_PATH_PROTOCOL *FilePath\r |
248 | )\r |
249 | {\r |
250 | EFI_STATUS Status;\r |
251 | TCG_PCR_EVENT *TcgEvent;\r |
252 | EFI_IMAGE_LOAD_EVENT *ImageLoad;\r |
253 | UINT32 FilePathSize;\r |
254 | VOID *Sha1Ctx;\r |
255 | UINTN CtxSize;\r |
256 | EFI_IMAGE_DOS_HEADER *DosHdr;\r |
257 | UINT32 PeCoffHeaderOffset;\r |
258 | EFI_IMAGE_SECTION_HEADER *Section;\r |
259 | UINT8 *HashBase;\r |
260 | UINTN HashSize;\r |
261 | UINTN SumOfBytesHashed;\r |
262 | EFI_IMAGE_SECTION_HEADER *SectionHeader;\r |
263 | UINTN Index, Pos;\r |
264 | UINT16 Magic;\r |
265 | UINT32 EventSize;\r |
266 | UINT32 EventNumber;\r |
267 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
268 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r |
269 | \r |
270 | Status = EFI_SUCCESS;\r |
271 | ImageLoad = NULL;\r |
272 | SectionHeader = NULL;\r |
273 | Sha1Ctx = NULL;\r |
274 | FilePathSize = (UINT32) GetDevicePathSize (FilePath);\r |
275 | \r |
276 | //\r |
277 | // Determine destination PCR by BootPolicy\r |
278 | //\r |
279 | EventSize = sizeof (*ImageLoad) - sizeof (ImageLoad->DevicePath) + FilePathSize;\r |
280 | TcgEvent = AllocateZeroPool (EventSize + sizeof (TCG_PCR_EVENT));\r |
281 | if (TcgEvent == NULL) {\r |
282 | return EFI_OUT_OF_RESOURCES;\r |
283 | }\r |
284 | \r |
285 | TcgEvent->EventSize = EventSize;\r |
286 | ImageLoad = (EFI_IMAGE_LOAD_EVENT *) TcgEvent->Event;\r |
287 | \r |
288 | switch (ImageType) {\r |
289 | case EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION:\r |
290 | TcgEvent->EventType = EV_EFI_BOOT_SERVICES_APPLICATION;\r |
291 | TcgEvent->PCRIndex = 4;\r |
292 | break;\r |
293 | case EFI_IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:\r |
294 | TcgEvent->EventType = EV_EFI_BOOT_SERVICES_DRIVER;\r |
295 | TcgEvent->PCRIndex = 2;\r |
296 | break;\r |
297 | case EFI_IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:\r |
298 | TcgEvent->EventType = EV_EFI_RUNTIME_SERVICES_DRIVER;\r |
299 | TcgEvent->PCRIndex = 2;\r |
300 | break;\r |
301 | default:\r |
302 | DEBUG ((\r |
303 | EFI_D_ERROR,\r |
304 | "TcgMeasurePeImage: Unknown subsystem type %d",\r |
305 | ImageType\r |
306 | ));\r |
307 | ASSERT (FALSE);\r |
308 | TcgEvent->EventType = ImageType;\r |
309 | Status = EFI_UNSUPPORTED;\r |
310 | goto Finish;\r |
311 | }\r |
312 | \r |
313 | ImageLoad->ImageLocationInMemory = ImageAddress;\r |
314 | ImageLoad->ImageLengthInMemory = ImageSize;\r |
315 | ImageLoad->ImageLinkTimeAddress = LinkTimeBase;\r |
316 | ImageLoad->LengthOfDevicePath = FilePathSize;\r |
317 | CopyMem (ImageLoad->DevicePath, FilePath, FilePathSize);\r |
318 | \r |
319 | //\r |
320 | // Check PE/COFF image\r |
321 | //\r |
322 | DosHdr = (EFI_IMAGE_DOS_HEADER *) (UINTN) ImageAddress;\r |
323 | PeCoffHeaderOffset = 0;\r |
324 | if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {\r |
325 | PeCoffHeaderOffset = DosHdr->e_lfanew;\r |
326 | }\r |
327 | if (((EFI_TE_IMAGE_HEADER *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset))->Signature\r |
328 | == EFI_TE_IMAGE_HEADER_SIGNATURE) {\r |
329 | goto Finish;\r |
330 | }\r |
331 | \r |
332 | //\r |
333 | // PE/COFF Image Measurement\r |
334 | //\r |
335 | // NOTE: The following codes/steps are based upon the authenticode image hashing in\r |
336 | // PE/COFF Specification 8.0 Appendix A.\r |
337 | //\r |
338 | //\r |
339 | \r |
340 | // 1. Load the image header into memory.\r |
341 | \r |
342 | // 2. Initialize a SHA hash context.\r |
343 | CtxSize = Sha1GetContextSize ();\r |
344 | Sha1Ctx = AllocatePool (CtxSize);\r |
345 | if (Sha1Ctx == NULL) {\r |
346 | Status = EFI_OUT_OF_RESOURCES;\r |
347 | goto Finish;\r |
348 | }\r |
349 | \r |
350 | Sha1Init (Sha1Ctx);\r |
351 | \r |
352 | //\r |
353 | // Measuring PE/COFF Image Header;\r |
354 | // But CheckSum field and SECURITY data directory (certificate) are excluded\r |
355 | //\r |
356 | Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset);\r |
357 | Magic = Hdr.Pe32->OptionalHeader.Magic;\r |
358 | \r |
359 | //\r |
360 | // 3. Calculate the distance from the base of the image header to the image checksum address.\r |
361 | // 4. Hash the image header from its base to beginning of the image checksum.\r |
362 | //\r |
363 | HashBase = (UINT8 *) (UINTN) ImageAddress;\r |
364 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
365 | //\r |
366 | // Use PE32 offset\r |
367 | //\r |
368 | HashSize = (UINTN) ((UINT8 *)(&Hdr.Pe32->OptionalHeader.CheckSum) - HashBase);\r |
369 | } else {\r |
370 | //\r |
371 | // Use PE32+ offset\r |
372 | //\r |
373 | HashSize = (UINTN) ((UINT8 *)(&Hdr.Pe32Plus->OptionalHeader.CheckSum) - HashBase);\r |
374 | }\r |
375 | \r |
376 | Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
377 | \r |
378 | //\r |
379 | // 5. Skip over the image checksum (it occupies a single ULONG).\r |
380 | // 6. Get the address of the beginning of the Cert Directory.\r |
381 | // 7. Hash everything from the end of the checksum to the start of the Cert Directory.\r |
382 | //\r |
383 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
384 | //\r |
385 | // Use PE32 offset\r |
386 | //\r |
387 | HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);\r |
388 | HashSize = (UINTN) ((UINT8 *)(&Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - HashBase);\r |
389 | } else {\r |
390 | //\r |
391 | // Use PE32+ offset\r |
392 | // \r |
393 | HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);\r |
394 | HashSize = (UINTN) ((UINT8 *)(&Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - HashBase);\r |
395 | }\r |
396 | \r |
397 | Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
398 | \r |
399 | //\r |
400 | // 8. Skip over the Cert Directory. (It is sizeof(IMAGE_DATA_DIRECTORY) bytes.)\r |
401 | // 9. Hash everything from the end of the Cert Directory to the end of image header.\r |
402 | //\r |
403 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
404 | //\r |
405 | // Use PE32 offset\r |
406 | //\r |
407 | HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];\r |
408 | HashSize = Hdr.Pe32->OptionalHeader.SizeOfHeaders -\r |
409 | (UINTN) ((UINT8 *)(&Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1]) - (UINT8 *) (UINTN) ImageAddress);\r |
410 | } else {\r |
411 | //\r |
412 | // Use PE32+ offset\r |
413 | //\r |
414 | HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];\r |
415 | HashSize = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders -\r |
416 | (UINTN) ((UINT8 *)(&Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1]) - (UINT8 *) (UINTN) ImageAddress);\r |
417 | }\r |
418 | \r |
419 | Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
420 | \r |
421 | //\r |
422 | // 10. Set the SUM_OF_BYTES_HASHED to the size of the header\r |
423 | //\r |
424 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
425 | //\r |
426 | // Use PE32 offset\r |
427 | //\r |
428 | SumOfBytesHashed = Hdr.Pe32->OptionalHeader.SizeOfHeaders;\r |
429 | } else {\r |
430 | //\r |
431 | // Use PE32+ offset\r |
432 | //\r |
433 | SumOfBytesHashed = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders;\r |
434 | }\r |
435 | \r |
436 | //\r |
437 | // 11. Build a temporary table of pointers to all the IMAGE_SECTION_HEADER\r |
438 | // structures in the image. The 'NumberOfSections' field of the image\r |
439 | // header indicates how big the table should be. Do not include any\r |
440 | // IMAGE_SECTION_HEADERs in the table whose 'SizeOfRawData' field is zero.\r |
441 | //\r |
442 | SectionHeader = (EFI_IMAGE_SECTION_HEADER *)AllocateZeroPool (sizeof (EFI_IMAGE_SECTION_HEADER) * Hdr.Pe32->FileHeader.NumberOfSections);\r |
443 | if (SectionHeader == NULL) {\r |
444 | Status = EFI_OUT_OF_RESOURCES;\r |
445 | goto Finish;\r |
446 | }\r |
447 | \r |
448 | //\r |
449 | // 12. Using the 'PointerToRawData' in the referenced section headers as\r |
450 | // a key, arrange the elements in the table in ascending order. In other\r |
451 | // words, sort the section headers according to the disk-file offset of\r |
452 | // the section.\r |
453 | //\r |
454 | Section = (EFI_IMAGE_SECTION_HEADER *) (\r |
455 | (UINT8 *) (UINTN) ImageAddress +\r |
456 | PeCoffHeaderOffset +\r |
457 | sizeof(UINT32) +\r |
458 | sizeof(EFI_IMAGE_FILE_HEADER) +\r |
459 | Hdr.Pe32->FileHeader.SizeOfOptionalHeader\r |
460 | );\r |
461 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r |
462 | Pos = Index;\r |
463 | while ((Pos > 0) && (Section->PointerToRawData < SectionHeader[Pos - 1].PointerToRawData)) {\r |
464 | CopyMem (&SectionHeader[Pos], &SectionHeader[Pos - 1], sizeof(EFI_IMAGE_SECTION_HEADER));\r |
465 | Pos--;\r |
466 | }\r |
467 | CopyMem (&SectionHeader[Pos], Section, sizeof(EFI_IMAGE_SECTION_HEADER));\r |
468 | Section += 1;\r |
469 | }\r |
470 | \r |
471 | //\r |
472 | // 13. Walk through the sorted table, bring the corresponding section\r |
473 | // into memory, and hash the entire section (using the 'SizeOfRawData'\r |
474 | // field in the section header to determine the amount of data to hash).\r |
475 | // 14. Add the section's 'SizeOfRawData' to SUM_OF_BYTES_HASHED .\r |
476 | // 15. Repeat steps 13 and 14 for all the sections in the sorted table.\r |
477 | //\r |
478 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r |
479 | Section = (EFI_IMAGE_SECTION_HEADER *) &SectionHeader[Index];\r |
480 | if (Section->SizeOfRawData == 0) {\r |
481 | continue;\r |
482 | }\r |
483 | HashBase = (UINT8 *) (UINTN) ImageAddress + Section->PointerToRawData;\r |
484 | HashSize = (UINTN) Section->SizeOfRawData;\r |
485 | \r |
486 | Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
487 | \r |
488 | SumOfBytesHashed += HashSize;\r |
489 | }\r |
490 | \r |
491 | //\r |
492 | // 16. If the file size is greater than SUM_OF_BYTES_HASHED, there is extra\r |
493 | // data in the file that needs to be added to the hash. This data begins\r |
494 | // at file offset SUM_OF_BYTES_HASHED and its length is:\r |
495 | // FileSize - (CertDirectory->Size)\r |
496 | //\r |
497 | if (ImageSize > SumOfBytesHashed) {\r |
498 | HashBase = (UINT8 *) (UINTN) ImageAddress + SumOfBytesHashed;\r |
499 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
500 | //\r |
501 | // Use PE32 offset\r |
502 | //\r |
503 | HashSize = (UINTN)(ImageSize -\r |
504 | Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size -\r |
505 | SumOfBytesHashed);\r |
506 | } else {\r |
507 | //\r |
508 | // Use PE32+ offset\r |
509 | //\r |
510 | HashSize = (UINTN)(ImageSize -\r |
511 | Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size -\r |
512 | SumOfBytesHashed); \r |
513 | }\r |
514 | \r |
515 | Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
516 | }\r |
517 | \r |
518 | //\r |
519 | // 17. Finalize the SHA hash.\r |
520 | //\r |
521 | Sha1Final (Sha1Ctx, (UINT8 *)&TcgEvent->Digest);\r |
522 | \r |
523 | //\r |
524 | // Log the PE data\r |
525 | //\r |
526 | EventNumber = 1;\r |
527 | Status = TcgProtocol->HashLogExtendEvent (\r |
528 | TcgProtocol,\r |
529 | (EFI_PHYSICAL_ADDRESS) (UINTN) (VOID *) NULL,\r |
530 | 0,\r |
531 | TPM_ALG_SHA,\r |
532 | TcgEvent,\r |
533 | &EventNumber,\r |
534 | &EventLogLastEntry\r |
535 | );\r |
536 | \r |
537 | Finish:\r |
538 | FreePool (TcgEvent);\r |
539 | \r |
540 | if (SectionHeader != NULL) {\r |
541 | FreePool (SectionHeader);\r |
542 | }\r |
543 | \r |
544 | if (Sha1Ctx != NULL ) {\r |
545 | FreePool (Sha1Ctx);\r |
546 | }\r |
547 | return Status;\r |
548 | }\r |
549 | \r |
550 | /**\r |
551 | The security handler is used to abstract platform-specific policy \r |
552 | from the DXE core response to an attempt to use a file that returns a \r |
553 | given status for the authentication check from the section extraction protocol. \r |
554 | \r |
555 | The possible responses in a given SAP implementation may include locking \r |
556 | flash upon failure to authenticate, attestation logging for all signed drivers, \r |
557 | and other exception operations. The File parameter allows for possible logging \r |
558 | within the SAP of the driver.\r |
559 | \r |
560 | If File is NULL, then EFI_INVALID_PARAMETER is returned.\r |
561 | \r |
562 | If the file specified by File with an authentication status specified by \r |
563 | AuthenticationStatus is safe for the DXE Core to use, then EFI_SUCCESS is returned.\r |
564 | \r |
565 | If the file specified by File with an authentication status specified by \r |
566 | AuthenticationStatus is not safe for the DXE Core to use under any circumstances, \r |
567 | then EFI_ACCESS_DENIED is returned.\r |
568 | \r |
569 | If the file specified by File with an authentication status specified by \r |
570 | AuthenticationStatus is not safe for the DXE Core to use right now, but it \r |
571 | might be possible to use it at a future time, then EFI_SECURITY_VIOLATION is \r |
572 | returned.\r |
573 | \r |
574 | @param[in, out] AuthenticationStatus This is the authentication status returned\r |
575 | from the securitymeasurement services for the\r |
576 | input file.\r |
577 | @param[in] File This is a pointer to the device path of the file that is\r |
578 | being dispatched. This will optionally be used for logging.\r |
579 | @param[in] FileBuffer File buffer matches the input file device path.\r |
580 | @param[in] FileSize Size of File buffer matches the input file device path.\r |
581 | \r |
582 | @retval EFI_SUCCESS The file specified by File did authenticate, and the\r |
583 | platform policy dictates that the DXE Core may use File.\r |
584 | @retval EFI_INVALID_PARAMETER File is NULL.\r |
585 | @retval EFI_SECURITY_VIOLATION The file specified by File did not authenticate, and\r |
586 | the platform policy dictates that File should be placed\r |
587 | in the untrusted state. A file may be promoted from\r |
588 | the untrusted to the trusted state at a future time\r |
589 | with a call to the Trust() DXE Service.\r |
590 | @retval EFI_ACCESS_DENIED The file specified by File did not authenticate, and\r |
591 | the platform policy dictates that File should not be\r |
592 | used for any purpose.\r |
593 | \r |
594 | **/\r |
595 | EFI_STATUS\r |
596 | EFIAPI\r |
597 | DxeTpmMeasureBootHandler (\r |
598 | IN OUT UINT32 AuthenticationStatus,\r |
599 | IN CONST EFI_DEVICE_PATH_PROTOCOL *File,\r |
600 | IN VOID *FileBuffer OPTIONAL,\r |
601 | IN UINTN FileSize OPTIONAL\r |
602 | )\r |
603 | {\r |
604 | EFI_TCG_PROTOCOL *TcgProtocol;\r |
605 | EFI_STATUS Status;\r |
606 | TCG_EFI_BOOT_SERVICE_CAPABILITY ProtocolCapability;\r |
607 | UINT32 TCGFeatureFlags;\r |
608 | EFI_PHYSICAL_ADDRESS EventLogLocation;\r |
609 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
610 | EFI_DEVICE_PATH_PROTOCOL *DevicePathNode;\r |
611 | EFI_DEVICE_PATH_PROTOCOL *OrigDevicePathNode;\r |
612 | EFI_HANDLE Handle;\r |
613 | BOOLEAN ApplicationRequired;\r |
614 | PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;\r |
615 | \r |
616 | if (File == NULL) {\r |
617 | return EFI_INVALID_PARAMETER;\r |
618 | }\r |
619 | \r |
620 | Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &TcgProtocol);\r |
621 | if (EFI_ERROR (Status)) {\r |
622 | //\r |
623 | // TCG protocol is not installed. So, TPM is not present.\r |
624 | // Don't do any measurement, and directly return EFI_SUCCESS.\r |
625 | //\r |
626 | return EFI_SUCCESS;\r |
627 | }\r |
628 | \r |
629 | ProtocolCapability.Size = (UINT8) sizeof (ProtocolCapability);\r |
630 | Status = TcgProtocol->StatusCheck (\r |
631 | TcgProtocol, \r |
632 | &ProtocolCapability,\r |
633 | &TCGFeatureFlags,\r |
634 | &EventLogLocation,\r |
635 | &EventLogLastEntry\r |
636 | );\r |
637 | if (EFI_ERROR (Status) || ProtocolCapability.TPMDeactivatedFlag) {\r |
638 | //\r |
639 | // TPM device doesn't work or activate.\r |
640 | //\r |
641 | return EFI_SUCCESS;\r |
642 | }\r |
643 | \r |
644 | //\r |
645 | // Copy File Device Path\r |
646 | //\r |
647 | OrigDevicePathNode = DuplicateDevicePath (File);\r |
648 | ASSERT (OrigDevicePathNode != NULL);\r |
649 | \r |
650 | //\r |
651 | // 1. Check whether this device path support BlockIo protocol.\r |
652 | // Is so, this device path may be a GPT device path.\r |
653 | //\r |
654 | DevicePathNode = OrigDevicePathNode;\r |
655 | Status = gBS->LocateDevicePath (&gEfiBlockIoProtocolGuid, &DevicePathNode, &Handle);\r |
656 | if (!EFI_ERROR (Status) && !mMeasureGptTableFlag) {\r |
657 | //\r |
658 | // Find the gpt partion on the given devicepath\r |
659 | //\r |
660 | DevicePathNode = OrigDevicePathNode;\r |
661 | while (!IsDevicePathEnd (DevicePathNode)) {\r |
662 | //\r |
663 | // Find the Gpt partition\r |
664 | //\r |
665 | if (DevicePathType (DevicePathNode) == MEDIA_DEVICE_PATH &&\r |
666 | DevicePathSubType (DevicePathNode) == MEDIA_HARDDRIVE_DP) {\r |
667 | //\r |
668 | // Check whether it is a gpt partition or not\r |
669 | // \r |
670 | if (((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->MBRType == MBR_TYPE_EFI_PARTITION_TABLE_HEADER && \r |
671 | ((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->SignatureType == SIGNATURE_TYPE_GUID) {\r |
672 | \r |
673 | //\r |
674 | // Change the partition device path to its parent device path (disk) and get the handle.\r |
675 | //\r |
676 | DevicePathNode->Type = END_DEVICE_PATH_TYPE;\r |
677 | DevicePathNode->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;\r |
678 | DevicePathNode = OrigDevicePathNode;\r |
679 | Status = gBS->LocateDevicePath (\r |
680 | &gEfiDiskIoProtocolGuid,\r |
681 | &DevicePathNode,\r |
682 | &Handle\r |
683 | );\r |
684 | if (!EFI_ERROR (Status)) {\r |
685 | //\r |
686 | // Measure GPT disk.\r |
687 | //\r |
688 | Status = TcgMeasureGptTable (TcgProtocol, Handle);\r |
689 | if (!EFI_ERROR (Status)) {\r |
690 | //\r |
691 | // GPT disk check done.\r |
692 | //\r |
693 | mMeasureGptTableFlag = TRUE;\r |
694 | }\r |
695 | }\r |
696 | FreePool (OrigDevicePathNode);\r |
697 | OrigDevicePathNode = DuplicateDevicePath (File);\r |
698 | ASSERT (OrigDevicePathNode != NULL);\r |
699 | break;\r |
700 | }\r |
701 | }\r |
702 | DevicePathNode = NextDevicePathNode (DevicePathNode);\r |
703 | }\r |
704 | }\r |
705 | \r |
706 | //\r |
707 | // 2. Measure PE image.\r |
708 | //\r |
709 | ApplicationRequired = FALSE;\r |
710 | \r |
711 | //\r |
712 | // Check whether this device path support FV2 protocol.\r |
713 | //\r |
714 | DevicePathNode = OrigDevicePathNode;\r |
715 | Status = gBS->LocateDevicePath (&gEfiFirmwareVolume2ProtocolGuid, &DevicePathNode, &Handle);\r |
716 | if (!EFI_ERROR (Status)) {\r |
717 | //\r |
718 | // Don't check FV image, and directly return EFI_SUCCESS.\r |
719 | // It can be extended to the specific FV authentication according to the different requirement.\r |
720 | //\r |
721 | if (IsDevicePathEnd (DevicePathNode)) {\r |
722 | return EFI_SUCCESS;\r |
723 | }\r |
724 | //\r |
725 | // The image from Firmware image will not be mearsured.\r |
726 | // Current policy doesn't measure PeImage from Firmware if it is driver\r |
727 | // If the got PeImage is application, it will be still be measured.\r |
728 | //\r |
729 | ApplicationRequired = TRUE;\r |
730 | }\r |
731 | \r |
732 | //\r |
733 | // File is not found.\r |
734 | //\r |
735 | if (FileBuffer == NULL) {\r |
736 | Status = EFI_SECURITY_VIOLATION;\r |
737 | goto Finish;\r |
738 | }\r |
739 | \r |
740 | //\r |
741 | // Measure PE Image\r |
742 | //\r |
743 | DevicePathNode = OrigDevicePathNode;\r |
744 | ZeroMem (&ImageContext, sizeof (ImageContext));\r |
745 | ImageContext.Handle = (VOID *) FileBuffer;\r |
746 | ImageContext.ImageRead = (PE_COFF_LOADER_READ_FILE) ImageRead;\r |
747 | \r |
748 | //\r |
749 | // Get information about the image being loaded\r |
750 | //\r |
751 | Status = PeCoffLoaderGetImageInfo (&ImageContext);\r |
752 | if (EFI_ERROR (Status)) {\r |
753 | //\r |
754 | // The information can't be got from the invalid PeImage\r |
755 | //\r |
756 | goto Finish;\r |
757 | }\r |
758 | \r |
759 | //\r |
760 | // Measure only application if Application flag is set\r |
761 | // Measure drivers and applications if Application flag is not set\r |
762 | //\r |
763 | if ((!ApplicationRequired) || \r |
764 | (ApplicationRequired && ImageContext.ImageType == EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION)) { \r |
765 | //\r |
766 | // Print the image path to be measured.\r |
767 | // \r |
768 | DEBUG_CODE_BEGIN ();\r |
769 | CHAR16 *ToText;\r |
770 | EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *DevPathToText;\r |
771 | Status = gBS->LocateProtocol (\r |
772 | &gEfiDevicePathToTextProtocolGuid,\r |
773 | NULL,\r |
774 | (VOID **) &DevPathToText\r |
775 | );\r |
776 | if (!EFI_ERROR (Status)) {\r |
777 | ToText = DevPathToText->ConvertDevicePathToText (\r |
778 | DevicePathNode,\r |
779 | FALSE,\r |
780 | TRUE\r |
781 | );\r |
782 | if (ToText != NULL) {\r |
783 | DEBUG ((DEBUG_INFO, "The measured image path is %s.\n", ToText));\r |
784 | }\r |
785 | }\r |
786 | DEBUG_CODE_END ();\r |
787 | \r |
788 | //\r |
789 | // Measure PE image into TPM log.\r |
790 | //\r |
791 | Status = TcgMeasurePeImage (\r |
792 | TcgProtocol,\r |
793 | (EFI_PHYSICAL_ADDRESS) (UINTN) FileBuffer, \r |
794 | FileSize, \r |
795 | (UINTN) ImageContext.ImageAddress, \r |
796 | ImageContext.ImageType, \r |
797 | DevicePathNode\r |
798 | );\r |
799 | }\r |
800 | \r |
801 | //\r |
802 | // Done, free the allocated resource.\r |
803 | //\r |
804 | Finish:\r |
805 | FreePool (OrigDevicePathNode);\r |
806 | \r |
807 | return Status;\r |
808 | }\r |
809 | \r |
810 | /**\r |
811 | Register the security handler to provide TPM measure boot service.\r |
812 | \r |
813 | @param ImageHandle ImageHandle of the loaded driver.\r |
814 | @param SystemTable Pointer to the EFI System Table.\r |
815 | \r |
816 | @retval EFI_SUCCESS Register successfully.\r |
817 | @retval EFI_OUT_OF_RESOURCES No enough memory to register this handler.\r |
818 | **/\r |
819 | EFI_STATUS\r |
820 | EFIAPI\r |
821 | DxeTpmMeasureBootLibConstructor (\r |
822 | IN EFI_HANDLE ImageHandle,\r |
823 | IN EFI_SYSTEM_TABLE *SystemTable\r |
824 | )\r |
825 | {\r |
826 | return RegisterSecurityHandler (\r |
827 | DxeTpmMeasureBootHandler,\r |
828 | EFI_AUTH_OPERATION_MEASURE_IMAGE | EFI_AUTH_OPERATION_IMAGE_REQUIRED\r |
829 | );\r |
830 | }\r |