| 1 | /** @file\r |
| 2 | The library instance provides security service of TPM measure boot.\r |
| 3 | \r |
| 4 | Caution: This file requires additional review when modified.\r |
| 5 | This library will have external input - PE/COFF image and GPT partition.\r |
| 6 | This external input must be validated carefully to avoid security issue like\r |
| 7 | buffer overflow, integer overflow.\r |
| 8 | \r |
| 9 | DxeTpmMeasureBootLibImageRead() function will make sure the PE/COFF image content\r |
| 10 | read is within the image buffer.\r |
| 11 | \r |
| 12 | TcgMeasurePeImage() function will accept untrusted PE/COFF image and validate its\r |
| 13 | data structure within this image buffer before use.\r |
| 14 | \r |
| 15 | TcgMeasureGptTable() function will receive untrusted GPT partition table, and parse\r |
| 16 | partition data carefully.\r |
| 17 | \r |
| 18 | Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r |
| 19 | This program and the accompanying materials\r |
| 20 | are licensed and made available under the terms and conditions of the BSD License\r |
| 21 | which accompanies this distribution. The full text of the license may be found at\r |
| 22 | http://opensource.org/licenses/bsd-license.php\r |
| 23 | \r |
| 24 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| 25 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| 26 | \r |
| 27 | **/\r |
| 28 | \r |
| 29 | #include <PiDxe.h>\r |
| 30 | \r |
| 31 | #include <Protocol/TcgService.h>\r |
| 32 | #include <Protocol/BlockIo.h>\r |
| 33 | #include <Protocol/DiskIo.h>\r |
| 34 | #include <Protocol/FirmwareVolumeBlock.h>\r |
| 35 | \r |
| 36 | #include <Guid/MeasuredFvHob.h>\r |
| 37 | \r |
| 38 | #include <Library/BaseLib.h>\r |
| 39 | #include <Library/DebugLib.h>\r |
| 40 | #include <Library/BaseMemoryLib.h>\r |
| 41 | #include <Library/MemoryAllocationLib.h>\r |
| 42 | #include <Library/DevicePathLib.h>\r |
| 43 | #include <Library/UefiBootServicesTableLib.h>\r |
| 44 | #include <Library/BaseCryptLib.h>\r |
| 45 | #include <Library/PeCoffLib.h>\r |
| 46 | #include <Library/SecurityManagementLib.h>\r |
| 47 | #include <Library/HobLib.h>\r |
| 48 | \r |
| 49 | //\r |
| 50 | // Flag to check GPT partition. It only need be measured once.\r |
| 51 | //\r |
| 52 | BOOLEAN mMeasureGptTableFlag = FALSE;\r |
| 53 | UINTN mMeasureGptCount = 0;\r |
| 54 | VOID *mFileBuffer;\r |
| 55 | UINTN mTpmImageSize;\r |
| 56 | //\r |
| 57 | // Measured FV handle cache\r |
| 58 | //\r |
| 59 | EFI_HANDLE mCacheMeasuredHandle = NULL;\r |
| 60 | MEASURED_HOB_DATA *mMeasuredHobData = NULL;\r |
| 61 | \r |
| 62 | /**\r |
| 63 | Reads contents of a PE/COFF image in memory buffer.\r |
| 64 | \r |
| 65 | Caution: This function may receive untrusted input.\r |
| 66 | PE/COFF image is external input, so this function will make sure the PE/COFF image content\r |
| 67 | read is within the image buffer.\r |
| 68 | \r |
| 69 | @param FileHandle Pointer to the file handle to read the PE/COFF image.\r |
| 70 | @param FileOffset Offset into the PE/COFF image to begin the read operation.\r |
| 71 | @param ReadSize On input, the size in bytes of the requested read operation.\r |
| 72 | On output, the number of bytes actually read.\r |
| 73 | @param Buffer Output buffer that contains the data read from the PE/COFF image.\r |
| 74 | \r |
| 75 | @retval EFI_SUCCESS The specified portion of the PE/COFF image was read and the size\r |
| 76 | **/\r |
| 77 | EFI_STATUS\r |
| 78 | EFIAPI\r |
| 79 | DxeTpmMeasureBootLibImageRead (\r |
| 80 | IN VOID *FileHandle,\r |
| 81 | IN UINTN FileOffset,\r |
| 82 | IN OUT UINTN *ReadSize,\r |
| 83 | OUT VOID *Buffer\r |
| 84 | )\r |
| 85 | {\r |
| 86 | UINTN EndPosition;\r |
| 87 | \r |
| 88 | if (FileHandle == NULL || ReadSize == NULL || Buffer == NULL) {\r |
| 89 | return EFI_INVALID_PARAMETER;\r |
| 90 | }\r |
| 91 | \r |
| 92 | if (MAX_ADDRESS - FileOffset < *ReadSize) {\r |
| 93 | return EFI_INVALID_PARAMETER;\r |
| 94 | }\r |
| 95 | \r |
| 96 | EndPosition = FileOffset + *ReadSize;\r |
| 97 | if (EndPosition > mTpmImageSize) {\r |
| 98 | *ReadSize = (UINT32)(mTpmImageSize - FileOffset);\r |
| 99 | }\r |
| 100 | \r |
| 101 | if (FileOffset >= mTpmImageSize) {\r |
| 102 | *ReadSize = 0;\r |
| 103 | }\r |
| 104 | \r |
| 105 | CopyMem (Buffer, (UINT8 *)((UINTN) FileHandle + FileOffset), *ReadSize);\r |
| 106 | \r |
| 107 | return EFI_SUCCESS;\r |
| 108 | }\r |
| 109 | \r |
| 110 | /**\r |
| 111 | Measure GPT table data into TPM log.\r |
| 112 | \r |
| 113 | Caution: This function may receive untrusted input.\r |
| 114 | The GPT partition table is external input, so this function should parse partition data carefully.\r |
| 115 | \r |
| 116 | @param TcgProtocol Pointer to the located TCG protocol instance.\r |
| 117 | @param GptHandle Handle that GPT partition was installed.\r |
| 118 | \r |
| 119 | @retval EFI_SUCCESS Successfully measure GPT table.\r |
| 120 | @retval EFI_UNSUPPORTED Not support GPT table on the given handle.\r |
| 121 | @retval EFI_DEVICE_ERROR Can't get GPT table because device error.\r |
| 122 | @retval EFI_OUT_OF_RESOURCES No enough resource to measure GPT table.\r |
| 123 | @retval other error value\r |
| 124 | **/\r |
| 125 | EFI_STATUS\r |
| 126 | EFIAPI\r |
| 127 | TcgMeasureGptTable (\r |
| 128 | IN EFI_TCG_PROTOCOL *TcgProtocol,\r |
| 129 | IN EFI_HANDLE GptHandle\r |
| 130 | )\r |
| 131 | {\r |
| 132 | EFI_STATUS Status;\r |
| 133 | EFI_BLOCK_IO_PROTOCOL *BlockIo;\r |
| 134 | EFI_DISK_IO_PROTOCOL *DiskIo;\r |
| 135 | EFI_PARTITION_TABLE_HEADER *PrimaryHeader;\r |
| 136 | EFI_PARTITION_ENTRY *PartitionEntry;\r |
| 137 | UINT8 *EntryPtr;\r |
| 138 | UINTN NumberOfPartition;\r |
| 139 | UINT32 Index;\r |
| 140 | TCG_PCR_EVENT *TcgEvent;\r |
| 141 | EFI_GPT_DATA *GptData;\r |
| 142 | UINT32 EventSize;\r |
| 143 | UINT32 EventNumber;\r |
| 144 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
| 145 | \r |
| 146 | if (mMeasureGptCount > 0) {\r |
| 147 | return EFI_SUCCESS;\r |
| 148 | }\r |
| 149 | \r |
| 150 | Status = gBS->HandleProtocol (GptHandle, &gEfiBlockIoProtocolGuid, (VOID**)&BlockIo);\r |
| 151 | if (EFI_ERROR (Status)) {\r |
| 152 | return EFI_UNSUPPORTED;\r |
| 153 | }\r |
| 154 | Status = gBS->HandleProtocol (GptHandle, &gEfiDiskIoProtocolGuid, (VOID**)&DiskIo);\r |
| 155 | if (EFI_ERROR (Status)) {\r |
| 156 | return EFI_UNSUPPORTED;\r |
| 157 | }\r |
| 158 | //\r |
| 159 | // Read the EFI Partition Table Header\r |
| 160 | //\r |
| 161 | PrimaryHeader = (EFI_PARTITION_TABLE_HEADER *) AllocatePool (BlockIo->Media->BlockSize);\r |
| 162 | if (PrimaryHeader == NULL) {\r |
| 163 | return EFI_OUT_OF_RESOURCES;\r |
| 164 | }\r |
| 165 | Status = DiskIo->ReadDisk (\r |
| 166 | DiskIo,\r |
| 167 | BlockIo->Media->MediaId,\r |
| 168 | 1 * BlockIo->Media->BlockSize,\r |
| 169 | BlockIo->Media->BlockSize,\r |
| 170 | (UINT8 *)PrimaryHeader\r |
| 171 | );\r |
| 172 | if (EFI_ERROR (Status)) {\r |
| 173 | DEBUG ((EFI_D_ERROR, "Failed to Read Partition Table Header!\n"));\r |
| 174 | FreePool (PrimaryHeader);\r |
| 175 | return EFI_DEVICE_ERROR;\r |
| 176 | }\r |
| 177 | //\r |
| 178 | // Read the partition entry.\r |
| 179 | //\r |
| 180 | EntryPtr = (UINT8 *)AllocatePool (PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry);\r |
| 181 | if (EntryPtr == NULL) {\r |
| 182 | FreePool (PrimaryHeader);\r |
| 183 | return EFI_OUT_OF_RESOURCES;\r |
| 184 | }\r |
| 185 | Status = DiskIo->ReadDisk (\r |
| 186 | DiskIo,\r |
| 187 | BlockIo->Media->MediaId,\r |
| 188 | MultU64x32(PrimaryHeader->PartitionEntryLBA, BlockIo->Media->BlockSize),\r |
| 189 | PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry,\r |
| 190 | EntryPtr\r |
| 191 | );\r |
| 192 | if (EFI_ERROR (Status)) {\r |
| 193 | FreePool (PrimaryHeader);\r |
| 194 | FreePool (EntryPtr);\r |
| 195 | return EFI_DEVICE_ERROR;\r |
| 196 | }\r |
| 197 | \r |
| 198 | //\r |
| 199 | // Count the valid partition\r |
| 200 | //\r |
| 201 | PartitionEntry = (EFI_PARTITION_ENTRY *)EntryPtr;\r |
| 202 | NumberOfPartition = 0;\r |
| 203 | for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {\r |
| 204 | if (!IsZeroGuid (&PartitionEntry->PartitionTypeGUID)) {\r |
| 205 | NumberOfPartition++;\r |
| 206 | }\r |
| 207 | PartitionEntry = (EFI_PARTITION_ENTRY *)((UINT8 *)PartitionEntry + PrimaryHeader->SizeOfPartitionEntry);\r |
| 208 | }\r |
| 209 | \r |
| 210 | //\r |
| 211 | // Prepare Data for Measurement\r |
| 212 | //\r |
| 213 | EventSize = (UINT32)(sizeof (EFI_GPT_DATA) - sizeof (GptData->Partitions)\r |
| 214 | + NumberOfPartition * PrimaryHeader->SizeOfPartitionEntry);\r |
| 215 | TcgEvent = (TCG_PCR_EVENT *) AllocateZeroPool (EventSize + sizeof (TCG_PCR_EVENT_HDR));\r |
| 216 | if (TcgEvent == NULL) {\r |
| 217 | FreePool (PrimaryHeader);\r |
| 218 | FreePool (EntryPtr);\r |
| 219 | return EFI_OUT_OF_RESOURCES;\r |
| 220 | }\r |
| 221 | \r |
| 222 | TcgEvent->PCRIndex = 5;\r |
| 223 | TcgEvent->EventType = EV_EFI_GPT_EVENT;\r |
| 224 | TcgEvent->EventSize = EventSize;\r |
| 225 | GptData = (EFI_GPT_DATA *) TcgEvent->Event;\r |
| 226 | \r |
| 227 | //\r |
| 228 | // Copy the EFI_PARTITION_TABLE_HEADER and NumberOfPartition\r |
| 229 | //\r |
| 230 | CopyMem ((UINT8 *)GptData, (UINT8*)PrimaryHeader, sizeof (EFI_PARTITION_TABLE_HEADER));\r |
| 231 | GptData->NumberOfPartitions = NumberOfPartition;\r |
| 232 | //\r |
| 233 | // Copy the valid partition entry\r |
| 234 | //\r |
| 235 | PartitionEntry = (EFI_PARTITION_ENTRY*)EntryPtr;\r |
| 236 | NumberOfPartition = 0;\r |
| 237 | for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {\r |
| 238 | if (!IsZeroGuid (&PartitionEntry->PartitionTypeGUID)) {\r |
| 239 | CopyMem (\r |
| 240 | (UINT8 *)&GptData->Partitions + NumberOfPartition * PrimaryHeader->SizeOfPartitionEntry,\r |
| 241 | (UINT8 *)PartitionEntry,\r |
| 242 | PrimaryHeader->SizeOfPartitionEntry\r |
| 243 | );\r |
| 244 | NumberOfPartition++;\r |
| 245 | }\r |
| 246 | PartitionEntry =(EFI_PARTITION_ENTRY *)((UINT8 *)PartitionEntry + PrimaryHeader->SizeOfPartitionEntry);\r |
| 247 | }\r |
| 248 | \r |
| 249 | //\r |
| 250 | // Measure the GPT data\r |
| 251 | //\r |
| 252 | EventNumber = 1;\r |
| 253 | Status = TcgProtocol->HashLogExtendEvent (\r |
| 254 | TcgProtocol,\r |
| 255 | (EFI_PHYSICAL_ADDRESS) (UINTN) (VOID *) GptData,\r |
| 256 | (UINT64) TcgEvent->EventSize,\r |
| 257 | TPM_ALG_SHA,\r |
| 258 | TcgEvent,\r |
| 259 | &EventNumber,\r |
| 260 | &EventLogLastEntry\r |
| 261 | );\r |
| 262 | if (!EFI_ERROR (Status)) {\r |
| 263 | mMeasureGptCount++;\r |
| 264 | }\r |
| 265 | \r |
| 266 | FreePool (PrimaryHeader);\r |
| 267 | FreePool (EntryPtr);\r |
| 268 | FreePool (TcgEvent);\r |
| 269 | \r |
| 270 | return Status;\r |
| 271 | }\r |
| 272 | \r |
| 273 | /**\r |
| 274 | Measure PE image into TPM log based on the authenticode image hashing in\r |
| 275 | PE/COFF Specification 8.0 Appendix A.\r |
| 276 | \r |
| 277 | Caution: This function may receive untrusted input.\r |
| 278 | PE/COFF image is external input, so this function will validate its data structure\r |
| 279 | within this image buffer before use.\r |
| 280 | \r |
| 281 | Notes: PE/COFF image has been checked by BasePeCoffLib PeCoffLoaderGetImageInfo() in\r |
| 282 | its caller function DxeTpmMeasureBootHandler().\r |
| 283 | \r |
| 284 | @param[in] TcgProtocol Pointer to the located TCG protocol instance.\r |
| 285 | @param[in] ImageAddress Start address of image buffer.\r |
| 286 | @param[in] ImageSize Image size\r |
| 287 | @param[in] LinkTimeBase Address that the image is loaded into memory.\r |
| 288 | @param[in] ImageType Image subsystem type.\r |
| 289 | @param[in] FilePath File path is corresponding to the input image.\r |
| 290 | \r |
| 291 | @retval EFI_SUCCESS Successfully measure image.\r |
| 292 | @retval EFI_OUT_OF_RESOURCES No enough resource to measure image.\r |
| 293 | @retval EFI_UNSUPPORTED ImageType is unsupported or PE image is mal-format.\r |
| 294 | @retval other error value\r |
| 295 | \r |
| 296 | **/\r |
| 297 | EFI_STATUS\r |
| 298 | EFIAPI\r |
| 299 | TcgMeasurePeImage (\r |
| 300 | IN EFI_TCG_PROTOCOL *TcgProtocol,\r |
| 301 | IN EFI_PHYSICAL_ADDRESS ImageAddress,\r |
| 302 | IN UINTN ImageSize,\r |
| 303 | IN UINTN LinkTimeBase,\r |
| 304 | IN UINT16 ImageType,\r |
| 305 | IN EFI_DEVICE_PATH_PROTOCOL *FilePath\r |
| 306 | )\r |
| 307 | {\r |
| 308 | EFI_STATUS Status;\r |
| 309 | TCG_PCR_EVENT *TcgEvent;\r |
| 310 | EFI_IMAGE_LOAD_EVENT *ImageLoad;\r |
| 311 | UINT32 FilePathSize;\r |
| 312 | VOID *Sha1Ctx;\r |
| 313 | UINTN CtxSize;\r |
| 314 | EFI_IMAGE_DOS_HEADER *DosHdr;\r |
| 315 | UINT32 PeCoffHeaderOffset;\r |
| 316 | EFI_IMAGE_SECTION_HEADER *Section;\r |
| 317 | UINT8 *HashBase;\r |
| 318 | UINTN HashSize;\r |
| 319 | UINTN SumOfBytesHashed;\r |
| 320 | EFI_IMAGE_SECTION_HEADER *SectionHeader;\r |
| 321 | UINTN Index;\r |
| 322 | UINTN Pos;\r |
| 323 | UINT32 EventSize;\r |
| 324 | UINT32 EventNumber;\r |
| 325 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
| 326 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r |
| 327 | UINT32 NumberOfRvaAndSizes;\r |
| 328 | BOOLEAN HashStatus;\r |
| 329 | UINT32 CertSize;\r |
| 330 | \r |
| 331 | Status = EFI_UNSUPPORTED;\r |
| 332 | ImageLoad = NULL;\r |
| 333 | SectionHeader = NULL;\r |
| 334 | Sha1Ctx = NULL;\r |
| 335 | FilePathSize = (UINT32) GetDevicePathSize (FilePath);\r |
| 336 | \r |
| 337 | //\r |
| 338 | // Determine destination PCR by BootPolicy\r |
| 339 | //\r |
| 340 | EventSize = sizeof (*ImageLoad) - sizeof (ImageLoad->DevicePath) + FilePathSize;\r |
| 341 | TcgEvent = AllocateZeroPool (EventSize + sizeof (TCG_PCR_EVENT));\r |
| 342 | if (TcgEvent == NULL) {\r |
| 343 | return EFI_OUT_OF_RESOURCES;\r |
| 344 | }\r |
| 345 | \r |
| 346 | TcgEvent->EventSize = EventSize;\r |
| 347 | ImageLoad = (EFI_IMAGE_LOAD_EVENT *) TcgEvent->Event;\r |
| 348 | \r |
| 349 | switch (ImageType) {\r |
| 350 | case EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION:\r |
| 351 | TcgEvent->EventType = EV_EFI_BOOT_SERVICES_APPLICATION;\r |
| 352 | TcgEvent->PCRIndex = 4;\r |
| 353 | break;\r |
| 354 | case EFI_IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:\r |
| 355 | TcgEvent->EventType = EV_EFI_BOOT_SERVICES_DRIVER;\r |
| 356 | TcgEvent->PCRIndex = 2;\r |
| 357 | break;\r |
| 358 | case EFI_IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:\r |
| 359 | TcgEvent->EventType = EV_EFI_RUNTIME_SERVICES_DRIVER;\r |
| 360 | TcgEvent->PCRIndex = 2;\r |
| 361 | break;\r |
| 362 | default:\r |
| 363 | DEBUG ((\r |
| 364 | EFI_D_ERROR,\r |
| 365 | "TcgMeasurePeImage: Unknown subsystem type %d",\r |
| 366 | ImageType\r |
| 367 | ));\r |
| 368 | goto Finish;\r |
| 369 | }\r |
| 370 | \r |
| 371 | ImageLoad->ImageLocationInMemory = ImageAddress;\r |
| 372 | ImageLoad->ImageLengthInMemory = ImageSize;\r |
| 373 | ImageLoad->ImageLinkTimeAddress = LinkTimeBase;\r |
| 374 | ImageLoad->LengthOfDevicePath = FilePathSize;\r |
| 375 | if ((FilePath != NULL) && (FilePathSize != 0)) {\r |
| 376 | CopyMem (ImageLoad->DevicePath, FilePath, FilePathSize);\r |
| 377 | }\r |
| 378 | \r |
| 379 | //\r |
| 380 | // Check PE/COFF image\r |
| 381 | //\r |
| 382 | DosHdr = (EFI_IMAGE_DOS_HEADER *) (UINTN) ImageAddress;\r |
| 383 | PeCoffHeaderOffset = 0;\r |
| 384 | if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {\r |
| 385 | PeCoffHeaderOffset = DosHdr->e_lfanew;\r |
| 386 | }\r |
| 387 | \r |
| 388 | Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset);\r |
| 389 | if (Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {\r |
| 390 | goto Finish;\r |
| 391 | }\r |
| 392 | \r |
| 393 | //\r |
| 394 | // PE/COFF Image Measurement\r |
| 395 | //\r |
| 396 | // NOTE: The following codes/steps are based upon the authenticode image hashing in\r |
| 397 | // PE/COFF Specification 8.0 Appendix A.\r |
| 398 | //\r |
| 399 | //\r |
| 400 | \r |
| 401 | // 1. Load the image header into memory.\r |
| 402 | \r |
| 403 | // 2. Initialize a SHA hash context.\r |
| 404 | CtxSize = Sha1GetContextSize ();\r |
| 405 | Sha1Ctx = AllocatePool (CtxSize);\r |
| 406 | if (Sha1Ctx == NULL) {\r |
| 407 | Status = EFI_OUT_OF_RESOURCES;\r |
| 408 | goto Finish;\r |
| 409 | }\r |
| 410 | \r |
| 411 | HashStatus = Sha1Init (Sha1Ctx);\r |
| 412 | if (!HashStatus) {\r |
| 413 | goto Finish;\r |
| 414 | }\r |
| 415 | \r |
| 416 | //\r |
| 417 | // Measuring PE/COFF Image Header;\r |
| 418 | // But CheckSum field and SECURITY data directory (certificate) are excluded\r |
| 419 | //\r |
| 420 | \r |
| 421 | //\r |
| 422 | // 3. Calculate the distance from the base of the image header to the image checksum address.\r |
| 423 | // 4. Hash the image header from its base to beginning of the image checksum.\r |
| 424 | //\r |
| 425 | HashBase = (UINT8 *) (UINTN) ImageAddress;\r |
| 426 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 427 | //\r |
| 428 | // Use PE32 offset\r |
| 429 | //\r |
| 430 | NumberOfRvaAndSizes = Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes;\r |
| 431 | HashSize = (UINTN) (&Hdr.Pe32->OptionalHeader.CheckSum) - (UINTN) HashBase;\r |
| 432 | } else {\r |
| 433 | //\r |
| 434 | // Use PE32+ offset\r |
| 435 | //\r |
| 436 | NumberOfRvaAndSizes = Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes;\r |
| 437 | HashSize = (UINTN) (&Hdr.Pe32Plus->OptionalHeader.CheckSum) - (UINTN) HashBase;\r |
| 438 | }\r |
| 439 | \r |
| 440 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 441 | if (!HashStatus) {\r |
| 442 | goto Finish;\r |
| 443 | }\r |
| 444 | \r |
| 445 | //\r |
| 446 | // 5. Skip over the image checksum (it occupies a single ULONG).\r |
| 447 | //\r |
| 448 | if (NumberOfRvaAndSizes <= EFI_IMAGE_DIRECTORY_ENTRY_SECURITY) {\r |
| 449 | //\r |
| 450 | // 6. Since there is no Cert Directory in optional header, hash everything\r |
| 451 | // from the end of the checksum to the end of image header.\r |
| 452 | //\r |
| 453 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 454 | //\r |
| 455 | // Use PE32 offset.\r |
| 456 | //\r |
| 457 | HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);\r |
| 458 | HashSize = Hdr.Pe32->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);\r |
| 459 | } else {\r |
| 460 | //\r |
| 461 | // Use PE32+ offset.\r |
| 462 | //\r |
| 463 | HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);\r |
| 464 | HashSize = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);\r |
| 465 | }\r |
| 466 | \r |
| 467 | if (HashSize != 0) {\r |
| 468 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 469 | if (!HashStatus) {\r |
| 470 | goto Finish;\r |
| 471 | }\r |
| 472 | }\r |
| 473 | } else {\r |
| 474 | //\r |
| 475 | // 7. Hash everything from the end of the checksum to the start of the Cert Directory.\r |
| 476 | //\r |
| 477 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 478 | //\r |
| 479 | // Use PE32 offset\r |
| 480 | //\r |
| 481 | HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);\r |
| 482 | HashSize = (UINTN) (&Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - (UINTN) HashBase;\r |
| 483 | } else {\r |
| 484 | //\r |
| 485 | // Use PE32+ offset\r |
| 486 | //\r |
| 487 | HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);\r |
| 488 | HashSize = (UINTN) (&Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - (UINTN) HashBase;\r |
| 489 | }\r |
| 490 | \r |
| 491 | if (HashSize != 0) {\r |
| 492 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 493 | if (!HashStatus) {\r |
| 494 | goto Finish;\r |
| 495 | }\r |
| 496 | }\r |
| 497 | \r |
| 498 | //\r |
| 499 | // 8. Skip over the Cert Directory. (It is sizeof(IMAGE_DATA_DIRECTORY) bytes.)\r |
| 500 | // 9. Hash everything from the end of the Cert Directory to the end of image header.\r |
| 501 | //\r |
| 502 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 503 | //\r |
| 504 | // Use PE32 offset\r |
| 505 | //\r |
| 506 | HashBase = (UINT8 *) &Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];\r |
| 507 | HashSize = Hdr.Pe32->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);\r |
| 508 | } else {\r |
| 509 | //\r |
| 510 | // Use PE32+ offset\r |
| 511 | //\r |
| 512 | HashBase = (UINT8 *) &Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];\r |
| 513 | HashSize = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - (UINTN) (HashBase - ImageAddress);\r |
| 514 | }\r |
| 515 | \r |
| 516 | if (HashSize != 0) {\r |
| 517 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 518 | if (!HashStatus) {\r |
| 519 | goto Finish;\r |
| 520 | }\r |
| 521 | }\r |
| 522 | }\r |
| 523 | \r |
| 524 | //\r |
| 525 | // 10. Set the SUM_OF_BYTES_HASHED to the size of the header\r |
| 526 | //\r |
| 527 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 528 | //\r |
| 529 | // Use PE32 offset\r |
| 530 | //\r |
| 531 | SumOfBytesHashed = Hdr.Pe32->OptionalHeader.SizeOfHeaders;\r |
| 532 | } else {\r |
| 533 | //\r |
| 534 | // Use PE32+ offset\r |
| 535 | //\r |
| 536 | SumOfBytesHashed = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders;\r |
| 537 | }\r |
| 538 | \r |
| 539 | //\r |
| 540 | // 11. Build a temporary table of pointers to all the IMAGE_SECTION_HEADER\r |
| 541 | // structures in the image. The 'NumberOfSections' field of the image\r |
| 542 | // header indicates how big the table should be. Do not include any\r |
| 543 | // IMAGE_SECTION_HEADERs in the table whose 'SizeOfRawData' field is zero.\r |
| 544 | //\r |
| 545 | SectionHeader = (EFI_IMAGE_SECTION_HEADER *) AllocateZeroPool (sizeof (EFI_IMAGE_SECTION_HEADER) * Hdr.Pe32->FileHeader.NumberOfSections);\r |
| 546 | if (SectionHeader == NULL) {\r |
| 547 | Status = EFI_OUT_OF_RESOURCES;\r |
| 548 | goto Finish;\r |
| 549 | }\r |
| 550 | \r |
| 551 | //\r |
| 552 | // 12. Using the 'PointerToRawData' in the referenced section headers as\r |
| 553 | // a key, arrange the elements in the table in ascending order. In other\r |
| 554 | // words, sort the section headers according to the disk-file offset of\r |
| 555 | // the section.\r |
| 556 | //\r |
| 557 | Section = (EFI_IMAGE_SECTION_HEADER *) (\r |
| 558 | (UINT8 *) (UINTN) ImageAddress +\r |
| 559 | PeCoffHeaderOffset +\r |
| 560 | sizeof(UINT32) +\r |
| 561 | sizeof(EFI_IMAGE_FILE_HEADER) +\r |
| 562 | Hdr.Pe32->FileHeader.SizeOfOptionalHeader\r |
| 563 | );\r |
| 564 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r |
| 565 | Pos = Index;\r |
| 566 | while ((Pos > 0) && (Section->PointerToRawData < SectionHeader[Pos - 1].PointerToRawData)) {\r |
| 567 | CopyMem (&SectionHeader[Pos], &SectionHeader[Pos - 1], sizeof(EFI_IMAGE_SECTION_HEADER));\r |
| 568 | Pos--;\r |
| 569 | }\r |
| 570 | CopyMem (&SectionHeader[Pos], Section, sizeof(EFI_IMAGE_SECTION_HEADER));\r |
| 571 | Section += 1;\r |
| 572 | }\r |
| 573 | \r |
| 574 | //\r |
| 575 | // 13. Walk through the sorted table, bring the corresponding section\r |
| 576 | // into memory, and hash the entire section (using the 'SizeOfRawData'\r |
| 577 | // field in the section header to determine the amount of data to hash).\r |
| 578 | // 14. Add the section's 'SizeOfRawData' to SUM_OF_BYTES_HASHED .\r |
| 579 | // 15. Repeat steps 13 and 14 for all the sections in the sorted table.\r |
| 580 | //\r |
| 581 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r |
| 582 | Section = (EFI_IMAGE_SECTION_HEADER *) &SectionHeader[Index];\r |
| 583 | if (Section->SizeOfRawData == 0) {\r |
| 584 | continue;\r |
| 585 | }\r |
| 586 | HashBase = (UINT8 *) (UINTN) ImageAddress + Section->PointerToRawData;\r |
| 587 | HashSize = (UINTN) Section->SizeOfRawData;\r |
| 588 | \r |
| 589 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 590 | if (!HashStatus) {\r |
| 591 | goto Finish;\r |
| 592 | }\r |
| 593 | \r |
| 594 | SumOfBytesHashed += HashSize;\r |
| 595 | }\r |
| 596 | \r |
| 597 | //\r |
| 598 | // 16. If the file size is greater than SUM_OF_BYTES_HASHED, there is extra\r |
| 599 | // data in the file that needs to be added to the hash. This data begins\r |
| 600 | // at file offset SUM_OF_BYTES_HASHED and its length is:\r |
| 601 | // FileSize - (CertDirectory->Size)\r |
| 602 | //\r |
| 603 | if (ImageSize > SumOfBytesHashed) {\r |
| 604 | HashBase = (UINT8 *) (UINTN) ImageAddress + SumOfBytesHashed;\r |
| 605 | \r |
| 606 | if (NumberOfRvaAndSizes <= EFI_IMAGE_DIRECTORY_ENTRY_SECURITY) {\r |
| 607 | CertSize = 0;\r |
| 608 | } else {\r |
| 609 | if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r |
| 610 | //\r |
| 611 | // Use PE32 offset.\r |
| 612 | //\r |
| 613 | CertSize = Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size;\r |
| 614 | } else {\r |
| 615 | //\r |
| 616 | // Use PE32+ offset.\r |
| 617 | //\r |
| 618 | CertSize = Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size;\r |
| 619 | }\r |
| 620 | }\r |
| 621 | \r |
| 622 | if (ImageSize > CertSize + SumOfBytesHashed) {\r |
| 623 | HashSize = (UINTN) (ImageSize - CertSize - SumOfBytesHashed);\r |
| 624 | \r |
| 625 | HashStatus = Sha1Update (Sha1Ctx, HashBase, HashSize);\r |
| 626 | if (!HashStatus) {\r |
| 627 | goto Finish;\r |
| 628 | }\r |
| 629 | } else if (ImageSize < CertSize + SumOfBytesHashed) {\r |
| 630 | goto Finish;\r |
| 631 | }\r |
| 632 | }\r |
| 633 | \r |
| 634 | //\r |
| 635 | // 17. Finalize the SHA hash.\r |
| 636 | //\r |
| 637 | HashStatus = Sha1Final (Sha1Ctx, (UINT8 *) &TcgEvent->Digest);\r |
| 638 | if (!HashStatus) {\r |
| 639 | goto Finish;\r |
| 640 | }\r |
| 641 | \r |
| 642 | //\r |
| 643 | // Log the PE data\r |
| 644 | //\r |
| 645 | EventNumber = 1;\r |
| 646 | Status = TcgProtocol->HashLogExtendEvent (\r |
| 647 | TcgProtocol,\r |
| 648 | (EFI_PHYSICAL_ADDRESS) (UINTN) (VOID *) NULL,\r |
| 649 | 0,\r |
| 650 | TPM_ALG_SHA,\r |
| 651 | TcgEvent,\r |
| 652 | &EventNumber,\r |
| 653 | &EventLogLastEntry\r |
| 654 | );\r |
| 655 | if (Status == EFI_OUT_OF_RESOURCES) {\r |
| 656 | //\r |
| 657 | // Out of resource here means the image is hashed and its result is extended to PCR.\r |
| 658 | // But the event log cann't be saved since log area is full.\r |
| 659 | // Just return EFI_SUCCESS in order not to block the image load.\r |
| 660 | //\r |
| 661 | Status = EFI_SUCCESS;\r |
| 662 | }\r |
| 663 | \r |
| 664 | Finish:\r |
| 665 | FreePool (TcgEvent);\r |
| 666 | \r |
| 667 | if (SectionHeader != NULL) {\r |
| 668 | FreePool (SectionHeader);\r |
| 669 | }\r |
| 670 | \r |
| 671 | if (Sha1Ctx != NULL ) {\r |
| 672 | FreePool (Sha1Ctx);\r |
| 673 | }\r |
| 674 | return Status;\r |
| 675 | }\r |
| 676 | \r |
| 677 | /**\r |
| 678 | The security handler is used to abstract platform-specific policy\r |
| 679 | from the DXE core response to an attempt to use a file that returns a\r |
| 680 | given status for the authentication check from the section extraction protocol.\r |
| 681 | \r |
| 682 | The possible responses in a given SAP implementation may include locking\r |
| 683 | flash upon failure to authenticate, attestation logging for all signed drivers,\r |
| 684 | and other exception operations. The File parameter allows for possible logging\r |
| 685 | within the SAP of the driver.\r |
| 686 | \r |
| 687 | If File is NULL, then EFI_INVALID_PARAMETER is returned.\r |
| 688 | \r |
| 689 | If the file specified by File with an authentication status specified by\r |
| 690 | AuthenticationStatus is safe for the DXE Core to use, then EFI_SUCCESS is returned.\r |
| 691 | \r |
| 692 | If the file specified by File with an authentication status specified by\r |
| 693 | AuthenticationStatus is not safe for the DXE Core to use under any circumstances,\r |
| 694 | then EFI_ACCESS_DENIED is returned.\r |
| 695 | \r |
| 696 | If the file specified by File with an authentication status specified by\r |
| 697 | AuthenticationStatus is not safe for the DXE Core to use right now, but it\r |
| 698 | might be possible to use it at a future time, then EFI_SECURITY_VIOLATION is\r |
| 699 | returned.\r |
| 700 | \r |
| 701 | @param[in] AuthenticationStatus This is the authentication status returned\r |
| 702 | from the securitymeasurement services for the\r |
| 703 | input file.\r |
| 704 | @param[in] File This is a pointer to the device path of the file that is\r |
| 705 | being dispatched. This will optionally be used for logging.\r |
| 706 | @param[in] FileBuffer File buffer matches the input file device path.\r |
| 707 | @param[in] FileSize Size of File buffer matches the input file device path.\r |
| 708 | @param[in] BootPolicy A boot policy that was used to call LoadImage() UEFI service.\r |
| 709 | \r |
| 710 | @retval EFI_SUCCESS The file specified by DevicePath and non-NULL\r |
| 711 | FileBuffer did authenticate, and the platform policy dictates\r |
| 712 | that the DXE Foundation may use the file.\r |
| 713 | @retval other error value\r |
| 714 | **/\r |
| 715 | EFI_STATUS\r |
| 716 | EFIAPI\r |
| 717 | DxeTpmMeasureBootHandler (\r |
| 718 | IN UINT32 AuthenticationStatus,\r |
| 719 | IN CONST EFI_DEVICE_PATH_PROTOCOL *File,\r |
| 720 | IN VOID *FileBuffer,\r |
| 721 | IN UINTN FileSize,\r |
| 722 | IN BOOLEAN BootPolicy\r |
| 723 | )\r |
| 724 | {\r |
| 725 | EFI_TCG_PROTOCOL *TcgProtocol;\r |
| 726 | EFI_STATUS Status;\r |
| 727 | TCG_EFI_BOOT_SERVICE_CAPABILITY ProtocolCapability;\r |
| 728 | UINT32 TCGFeatureFlags;\r |
| 729 | EFI_PHYSICAL_ADDRESS EventLogLocation;\r |
| 730 | EFI_PHYSICAL_ADDRESS EventLogLastEntry;\r |
| 731 | EFI_DEVICE_PATH_PROTOCOL *DevicePathNode;\r |
| 732 | EFI_DEVICE_PATH_PROTOCOL *OrigDevicePathNode;\r |
| 733 | EFI_HANDLE Handle;\r |
| 734 | EFI_HANDLE TempHandle;\r |
| 735 | BOOLEAN ApplicationRequired;\r |
| 736 | PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;\r |
| 737 | EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvbProtocol;\r |
| 738 | EFI_PHYSICAL_ADDRESS FvAddress;\r |
| 739 | UINT32 Index;\r |
| 740 | \r |
| 741 | Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &TcgProtocol);\r |
| 742 | if (EFI_ERROR (Status)) {\r |
| 743 | //\r |
| 744 | // TCG protocol is not installed. So, TPM is not present.\r |
| 745 | // Don't do any measurement, and directly return EFI_SUCCESS.\r |
| 746 | //\r |
| 747 | return EFI_SUCCESS;\r |
| 748 | }\r |
| 749 | \r |
| 750 | ProtocolCapability.Size = (UINT8) sizeof (ProtocolCapability);\r |
| 751 | Status = TcgProtocol->StatusCheck (\r |
| 752 | TcgProtocol,\r |
| 753 | &ProtocolCapability,\r |
| 754 | &TCGFeatureFlags,\r |
| 755 | &EventLogLocation,\r |
| 756 | &EventLogLastEntry\r |
| 757 | );\r |
| 758 | if (EFI_ERROR (Status) || ProtocolCapability.TPMDeactivatedFlag || (!ProtocolCapability.TPMPresentFlag)) {\r |
| 759 | //\r |
| 760 | // TPM device doesn't work or activate.\r |
| 761 | //\r |
| 762 | return EFI_SUCCESS;\r |
| 763 | }\r |
| 764 | \r |
| 765 | //\r |
| 766 | // Copy File Device Path\r |
| 767 | //\r |
| 768 | OrigDevicePathNode = DuplicateDevicePath (File);\r |
| 769 | \r |
| 770 | //\r |
| 771 | // 1. Check whether this device path support BlockIo protocol.\r |
| 772 | // Is so, this device path may be a GPT device path.\r |
| 773 | //\r |
| 774 | DevicePathNode = OrigDevicePathNode;\r |
| 775 | Status = gBS->LocateDevicePath (&gEfiBlockIoProtocolGuid, &DevicePathNode, &Handle);\r |
| 776 | if (!EFI_ERROR (Status) && !mMeasureGptTableFlag) {\r |
| 777 | //\r |
| 778 | // Find the gpt partion on the given devicepath\r |
| 779 | //\r |
| 780 | DevicePathNode = OrigDevicePathNode;\r |
| 781 | ASSERT (DevicePathNode != NULL);\r |
| 782 | while (!IsDevicePathEnd (DevicePathNode)) {\r |
| 783 | //\r |
| 784 | // Find the Gpt partition\r |
| 785 | //\r |
| 786 | if (DevicePathType (DevicePathNode) == MEDIA_DEVICE_PATH &&\r |
| 787 | DevicePathSubType (DevicePathNode) == MEDIA_HARDDRIVE_DP) {\r |
| 788 | //\r |
| 789 | // Check whether it is a gpt partition or not\r |
| 790 | //\r |
| 791 | if (((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->MBRType == MBR_TYPE_EFI_PARTITION_TABLE_HEADER &&\r |
| 792 | ((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->SignatureType == SIGNATURE_TYPE_GUID) {\r |
| 793 | \r |
| 794 | //\r |
| 795 | // Change the partition device path to its parent device path (disk) and get the handle.\r |
| 796 | //\r |
| 797 | DevicePathNode->Type = END_DEVICE_PATH_TYPE;\r |
| 798 | DevicePathNode->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;\r |
| 799 | DevicePathNode = OrigDevicePathNode;\r |
| 800 | Status = gBS->LocateDevicePath (\r |
| 801 | &gEfiDiskIoProtocolGuid,\r |
| 802 | &DevicePathNode,\r |
| 803 | &Handle\r |
| 804 | );\r |
| 805 | if (!EFI_ERROR (Status)) {\r |
| 806 | //\r |
| 807 | // Measure GPT disk.\r |
| 808 | //\r |
| 809 | Status = TcgMeasureGptTable (TcgProtocol, Handle);\r |
| 810 | if (!EFI_ERROR (Status)) {\r |
| 811 | //\r |
| 812 | // GPT disk check done.\r |
| 813 | //\r |
| 814 | mMeasureGptTableFlag = TRUE;\r |
| 815 | }\r |
| 816 | }\r |
| 817 | FreePool (OrigDevicePathNode);\r |
| 818 | OrigDevicePathNode = DuplicateDevicePath (File);\r |
| 819 | ASSERT (OrigDevicePathNode != NULL);\r |
| 820 | break;\r |
| 821 | }\r |
| 822 | }\r |
| 823 | DevicePathNode = NextDevicePathNode (DevicePathNode);\r |
| 824 | }\r |
| 825 | }\r |
| 826 | \r |
| 827 | //\r |
| 828 | // 2. Measure PE image.\r |
| 829 | //\r |
| 830 | ApplicationRequired = FALSE;\r |
| 831 | \r |
| 832 | //\r |
| 833 | // Check whether this device path support FVB protocol.\r |
| 834 | //\r |
| 835 | DevicePathNode = OrigDevicePathNode;\r |
| 836 | Status = gBS->LocateDevicePath (&gEfiFirmwareVolumeBlockProtocolGuid, &DevicePathNode, &Handle);\r |
| 837 | if (!EFI_ERROR (Status)) {\r |
| 838 | //\r |
| 839 | // Don't check FV image, and directly return EFI_SUCCESS.\r |
| 840 | // It can be extended to the specific FV authentication according to the different requirement.\r |
| 841 | //\r |
| 842 | if (IsDevicePathEnd (DevicePathNode)) {\r |
| 843 | return EFI_SUCCESS;\r |
| 844 | }\r |
| 845 | //\r |
| 846 | // The PE image from unmeasured Firmware volume need be measured\r |
| 847 | // The PE image from measured Firmware volume will be mearsured according to policy below.\r |
| 848 | // If it is driver, do not measure\r |
| 849 | // If it is application, still measure.\r |
| 850 | //\r |
| 851 | ApplicationRequired = TRUE;\r |
| 852 | \r |
| 853 | if (mCacheMeasuredHandle != Handle && mMeasuredHobData != NULL) {\r |
| 854 | //\r |
| 855 | // Search for Root FV of this PE image\r |
| 856 | //\r |
| 857 | TempHandle = Handle;\r |
| 858 | do {\r |
| 859 | Status = gBS->HandleProtocol(\r |
| 860 | TempHandle,\r |
| 861 | &gEfiFirmwareVolumeBlockProtocolGuid,\r |
| 862 | (VOID**)&FvbProtocol\r |
| 863 | );\r |
| 864 | TempHandle = FvbProtocol->ParentHandle;\r |
| 865 | } while (!EFI_ERROR(Status) && FvbProtocol->ParentHandle != NULL);\r |
| 866 | \r |
| 867 | //\r |
| 868 | // Search in measured FV Hob\r |
| 869 | //\r |
| 870 | Status = FvbProtocol->GetPhysicalAddress(FvbProtocol, &FvAddress);\r |
| 871 | if (EFI_ERROR(Status)){\r |
| 872 | return Status;\r |
| 873 | }\r |
| 874 | \r |
| 875 | ApplicationRequired = FALSE;\r |
| 876 | \r |
| 877 | for (Index = 0; Index < mMeasuredHobData->Num; Index++) {\r |
| 878 | if(mMeasuredHobData->MeasuredFvBuf[Index].BlobBase == FvAddress) {\r |
| 879 | //\r |
| 880 | // Cache measured FV for next measurement\r |
| 881 | //\r |
| 882 | mCacheMeasuredHandle = Handle;\r |
| 883 | ApplicationRequired = TRUE;\r |
| 884 | break;\r |
| 885 | }\r |
| 886 | }\r |
| 887 | }\r |
| 888 | }\r |
| 889 | \r |
| 890 | //\r |
| 891 | // File is not found.\r |
| 892 | //\r |
| 893 | if (FileBuffer == NULL) {\r |
| 894 | Status = EFI_SECURITY_VIOLATION;\r |
| 895 | goto Finish;\r |
| 896 | }\r |
| 897 | \r |
| 898 | mTpmImageSize = FileSize;\r |
| 899 | mFileBuffer = FileBuffer;\r |
| 900 | \r |
| 901 | //\r |
| 902 | // Measure PE Image\r |
| 903 | //\r |
| 904 | DevicePathNode = OrigDevicePathNode;\r |
| 905 | ZeroMem (&ImageContext, sizeof (ImageContext));\r |
| 906 | ImageContext.Handle = (VOID *) FileBuffer;\r |
| 907 | ImageContext.ImageRead = (PE_COFF_LOADER_READ_FILE) DxeTpmMeasureBootLibImageRead;\r |
| 908 | \r |
| 909 | //\r |
| 910 | // Get information about the image being loaded\r |
| 911 | //\r |
| 912 | Status = PeCoffLoaderGetImageInfo (&ImageContext);\r |
| 913 | if (EFI_ERROR (Status)) {\r |
| 914 | //\r |
| 915 | // The information can't be got from the invalid PeImage\r |
| 916 | //\r |
| 917 | goto Finish;\r |
| 918 | }\r |
| 919 | \r |
| 920 | //\r |
| 921 | // Measure only application if Application flag is set\r |
| 922 | // Measure drivers and applications if Application flag is not set\r |
| 923 | //\r |
| 924 | if ((!ApplicationRequired) ||\r |
| 925 | (ApplicationRequired && ImageContext.ImageType == EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION)) {\r |
| 926 | //\r |
| 927 | // Print the image path to be measured.\r |
| 928 | //\r |
| 929 | DEBUG_CODE_BEGIN ();\r |
| 930 | CHAR16 *ToText;\r |
| 931 | ToText = ConvertDevicePathToText (\r |
| 932 | DevicePathNode,\r |
| 933 | FALSE,\r |
| 934 | TRUE\r |
| 935 | );\r |
| 936 | if (ToText != NULL) {\r |
| 937 | DEBUG ((DEBUG_INFO, "The measured image path is %s.\n", ToText));\r |
| 938 | FreePool (ToText);\r |
| 939 | }\r |
| 940 | DEBUG_CODE_END ();\r |
| 941 | \r |
| 942 | //\r |
| 943 | // Measure PE image into TPM log.\r |
| 944 | //\r |
| 945 | Status = TcgMeasurePeImage (\r |
| 946 | TcgProtocol,\r |
| 947 | (EFI_PHYSICAL_ADDRESS) (UINTN) FileBuffer,\r |
| 948 | FileSize,\r |
| 949 | (UINTN) ImageContext.ImageAddress,\r |
| 950 | ImageContext.ImageType,\r |
| 951 | DevicePathNode\r |
| 952 | );\r |
| 953 | }\r |
| 954 | \r |
| 955 | //\r |
| 956 | // Done, free the allocated resource.\r |
| 957 | //\r |
| 958 | Finish:\r |
| 959 | if (OrigDevicePathNode != NULL) {\r |
| 960 | FreePool (OrigDevicePathNode);\r |
| 961 | }\r |
| 962 | \r |
| 963 | return Status;\r |
| 964 | }\r |
| 965 | \r |
| 966 | /**\r |
| 967 | Register the security handler to provide TPM measure boot service.\r |
| 968 | \r |
| 969 | @param ImageHandle ImageHandle of the loaded driver.\r |
| 970 | @param SystemTable Pointer to the EFI System Table.\r |
| 971 | \r |
| 972 | @retval EFI_SUCCESS Register successfully.\r |
| 973 | @retval EFI_OUT_OF_RESOURCES No enough memory to register this handler.\r |
| 974 | **/\r |
| 975 | EFI_STATUS\r |
| 976 | EFIAPI\r |
| 977 | DxeTpmMeasureBootLibConstructor (\r |
| 978 | IN EFI_HANDLE ImageHandle,\r |
| 979 | IN EFI_SYSTEM_TABLE *SystemTable\r |
| 980 | )\r |
| 981 | {\r |
| 982 | EFI_HOB_GUID_TYPE *GuidHob;\r |
| 983 | \r |
| 984 | GuidHob = NULL;\r |
| 985 | \r |
| 986 | GuidHob = GetFirstGuidHob (&gMeasuredFvHobGuid);\r |
| 987 | \r |
| 988 | if (GuidHob != NULL) {\r |
| 989 | mMeasuredHobData = GET_GUID_HOB_DATA (GuidHob);\r |
| 990 | }\r |
| 991 | \r |
| 992 | return RegisterSecurity2Handler (\r |
| 993 | DxeTpmMeasureBootHandler,\r |
| 994 | EFI_AUTH_OPERATION_MEASURE_IMAGE | EFI_AUTH_OPERATION_IMAGE_REQUIRED\r |
| 995 | );\r |
| 996 | }\r |