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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 |