summaryrefslogtreecommitdiff
path: root/SecurityPkg/Library/DxeTpm2MeasureBootLib/DxeTpm2MeasureBootLib.c
blob: 8482031e437ead45300c5bd2939906c3374a1d7d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
/** @file
  The library instance provides security service of TPM2 measure boot.

  Caution: This file requires additional review when modified.
  This library will have external input - PE/COFF image and GPT partition.
  This external input must be validated carefully to avoid security issue like
  buffer overflow, integer overflow.

  DxeTpm2MeasureBootLibImageRead() function will make sure the PE/COFF image content
  read is within the image buffer.

  TrEEMeasurePeImage() function will accept untrusted PE/COFF image and validate its
  data structure within this image buffer before use.

  TrEEMeasureGptTable() function will receive untrusted GPT partition table, and parse
  partition data carefully.

Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials 
are licensed and made available under the terms and conditions of the BSD License 
which accompanies this distribution.  The full text of the license may be found at 
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <PiDxe.h>

#include <Protocol/TrEEProtocol.h>
#include <Protocol/BlockIo.h>
#include <Protocol/DiskIo.h>
#include <Protocol/DevicePathToText.h>
#include <Protocol/FirmwareVolumeBlock.h>

#include <Guid/MeasuredFvHob.h>

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DevicePathLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseCryptLib.h>
#include <Library/PeCoffLib.h>
#include <Library/SecurityManagementLib.h>
#include <Library/HobLib.h>

//
// Flag to check GPT partition. It only need be measured once.
//
BOOLEAN                           mTrEEMeasureGptTableFlag = FALSE;
EFI_GUID                          mTrEEZeroGuid = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}};
UINTN                             mTrEEMeasureGptCount = 0;
VOID                              *mTrEEFileBuffer;
UINTN                             mTrEEImageSize;
//
// Measured FV handle cache
//
EFI_HANDLE                        mTrEECacheMeasuredHandle  = NULL;
MEASURED_HOB_DATA                 *mTrEEMeasuredHobData     = NULL;

/**
  Reads contents of a PE/COFF image in memory buffer.

  Caution: This function may receive untrusted input.
  PE/COFF image is external input, so this function will make sure the PE/COFF image content
  read is within the image buffer.

  @param  FileHandle      Pointer to the file handle to read the PE/COFF image.
  @param  FileOffset      Offset into the PE/COFF image to begin the read operation.
  @param  ReadSize        On input, the size in bytes of the requested read operation.  
                          On output, the number of bytes actually read.
  @param  Buffer          Output buffer that contains the data read from the PE/COFF image.
  
  @retval EFI_SUCCESS     The specified portion of the PE/COFF image was read and the size 
**/
EFI_STATUS
EFIAPI
DxeTpm2MeasureBootLibImageRead (
  IN     VOID    *FileHandle,
  IN     UINTN   FileOffset,
  IN OUT UINTN   *ReadSize,
  OUT    VOID    *Buffer
  )
{
  UINTN               EndPosition;

  if (FileHandle == NULL || ReadSize == NULL || Buffer == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  if (MAX_ADDRESS - FileOffset < *ReadSize) {
    return EFI_INVALID_PARAMETER;
  }

  EndPosition = FileOffset + *ReadSize;
  if (EndPosition > mTrEEImageSize) {
    *ReadSize = (UINT32)(mTrEEImageSize - FileOffset);
  }

  if (FileOffset >= mTrEEImageSize) {
    *ReadSize = 0;
  }

  CopyMem (Buffer, (UINT8 *)((UINTN) FileHandle + FileOffset), *ReadSize);

  return EFI_SUCCESS;
}

/**
  Measure GPT table data into TPM log.

  Caution: This function may receive untrusted input.
  The GPT partition table is external input, so this function should parse partition data carefully.

  @param TreeProtocol            Pointer to the located TREE protocol instance.
  @param GptHandle               Handle that GPT partition was installed.

  @retval EFI_SUCCESS            Successfully measure GPT table.
  @retval EFI_UNSUPPORTED        Not support GPT table on the given handle.
  @retval EFI_DEVICE_ERROR       Can't get GPT table because device error.
  @retval EFI_OUT_OF_RESOURCES   No enough resource to measure GPT table.
  @retval other error value
**/
EFI_STATUS
EFIAPI
TrEEMeasureGptTable (
  IN  EFI_TREE_PROTOCOL  *TreeProtocol,
  IN  EFI_HANDLE         GptHandle
  )
{
  EFI_STATUS                        Status;
  EFI_BLOCK_IO_PROTOCOL             *BlockIo;
  EFI_DISK_IO_PROTOCOL              *DiskIo;
  EFI_PARTITION_TABLE_HEADER        *PrimaryHeader;
  EFI_PARTITION_ENTRY               *PartitionEntry;
  UINT8                             *EntryPtr;
  UINTN                             NumberOfPartition;
  UINT32                            Index;
  TrEE_EVENT                        *TreeEvent;
  EFI_GPT_DATA                      *GptData;
  UINT32                            EventSize;

  if (mTrEEMeasureGptCount > 0) {
    return EFI_SUCCESS;
  }

  Status = gBS->HandleProtocol (GptHandle, &gEfiBlockIoProtocolGuid, (VOID**)&BlockIo);
  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }
  Status = gBS->HandleProtocol (GptHandle, &gEfiDiskIoProtocolGuid, (VOID**)&DiskIo);
  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }
  //
  // Read the EFI Partition Table Header
  //  
  PrimaryHeader = (EFI_PARTITION_TABLE_HEADER *) AllocatePool (BlockIo->Media->BlockSize);
  if (PrimaryHeader == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }  
  Status = DiskIo->ReadDisk (
                     DiskIo,
                     BlockIo->Media->MediaId,
                     1 * BlockIo->Media->BlockSize,
                     BlockIo->Media->BlockSize,
                     (UINT8 *)PrimaryHeader
                     );
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "Failed to Read Partition Table Header!\n"));
    FreePool (PrimaryHeader);
    return EFI_DEVICE_ERROR;
  }  
  //
  // Read the partition entry.
  //
  EntryPtr = (UINT8 *)AllocatePool (PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry);
  if (EntryPtr == NULL) {
    FreePool (PrimaryHeader);
    return EFI_OUT_OF_RESOURCES;
  }
  Status = DiskIo->ReadDisk (
                     DiskIo,
                     BlockIo->Media->MediaId,
                     MultU64x32(PrimaryHeader->PartitionEntryLBA, BlockIo->Media->BlockSize),
                     PrimaryHeader->NumberOfPartitionEntries * PrimaryHeader->SizeOfPartitionEntry,
                     EntryPtr
                     );
  if (EFI_ERROR (Status)) {
    FreePool (PrimaryHeader);
    FreePool (EntryPtr);
    return EFI_DEVICE_ERROR;
  }
  
  //
  // Count the valid partition
  //
  PartitionEntry    = (EFI_PARTITION_ENTRY *)EntryPtr;
  NumberOfPartition = 0;
  for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {
    if (!CompareGuid (&PartitionEntry->PartitionTypeGUID, &mTrEEZeroGuid)) {
      NumberOfPartition++;  
    }
    PartitionEntry = (EFI_PARTITION_ENTRY *)((UINT8 *)PartitionEntry + PrimaryHeader->SizeOfPartitionEntry);
  }

  //
  // Prepare Data for Measurement
  // 
  EventSize = (UINT32)(sizeof (EFI_GPT_DATA) - sizeof (GptData->Partitions) 
                        + NumberOfPartition * PrimaryHeader->SizeOfPartitionEntry);
  TreeEvent = (TrEE_EVENT *) AllocateZeroPool (EventSize + sizeof (TrEE_EVENT) - sizeof(TreeEvent->Event));
  if (TreeEvent == NULL) {
    FreePool (PrimaryHeader);
    FreePool (EntryPtr);
    return EFI_OUT_OF_RESOURCES;
  }

  TreeEvent->Size = EventSize + sizeof (TrEE_EVENT) - sizeof(TreeEvent->Event);
  TreeEvent->Header.HeaderSize    = sizeof(TrEE_EVENT_HEADER);
  TreeEvent->Header.HeaderVersion = TREE_EVENT_HEADER_VERSION;
  TreeEvent->Header.PCRIndex      = 5;
  TreeEvent->Header.EventType     = EV_EFI_GPT_EVENT;
  GptData = (EFI_GPT_DATA *) TreeEvent->Event;  

  //
  // Copy the EFI_PARTITION_TABLE_HEADER and NumberOfPartition
  //  
  CopyMem ((UINT8 *)GptData, (UINT8*)PrimaryHeader, sizeof (EFI_PARTITION_TABLE_HEADER));
  GptData->NumberOfPartitions = NumberOfPartition;
  //
  // Copy the valid partition entry
  //
  PartitionEntry    = (EFI_PARTITION_ENTRY*)EntryPtr;
  NumberOfPartition = 0;
  for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {
    if (!CompareGuid (&PartitionEntry->PartitionTypeGUID, &mTrEEZeroGuid)) {
      CopyMem (
        (UINT8 *)&GptData->Partitions + NumberOfPartition * PrimaryHeader->SizeOfPartitionEntry,
        (UINT8 *)PartitionEntry,
        PrimaryHeader->SizeOfPartitionEntry
        );
      NumberOfPartition++;
    }
    PartitionEntry =(EFI_PARTITION_ENTRY *)((UINT8 *)PartitionEntry + PrimaryHeader->SizeOfPartitionEntry);
  }

  //
  // Measure the GPT data
  //
  Status = TreeProtocol->HashLogExtendEvent (
             TreeProtocol,
             0,
             (EFI_PHYSICAL_ADDRESS) (UINTN) (VOID *) GptData,
             (UINT64) EventSize,
             TreeEvent
             );
  if (!EFI_ERROR (Status)) {
    mTrEEMeasureGptCount++;
  }

  FreePool (PrimaryHeader);
  FreePool (EntryPtr);
  FreePool (TreeEvent);

  return Status;
}

/**
  Measure PE image into TPM log based on the authenticode image hashing in
  PE/COFF Specification 8.0 Appendix A.

  Caution: This function may receive untrusted input.
  PE/COFF image is external input, so this function will validate its data structure
  within this image buffer before use.

  @param[in] TreeProtocol   Pointer to the located TREE protocol instance.
  @param[in] ImageAddress   Start address of image buffer.
  @param[in] ImageSize      Image size
  @param[in] LinkTimeBase   Address that the image is loaded into memory.
  @param[in] ImageType      Image subsystem type.
  @param[in] FilePath       File path is corresponding to the input image.

  @retval EFI_SUCCESS            Successfully measure image.
  @retval EFI_OUT_OF_RESOURCES   No enough resource to measure image.
  @retval EFI_UNSUPPORTED        ImageType is unsupported or PE image is mal-format.  
  @retval other error value

**/
EFI_STATUS
EFIAPI
TrEEMeasurePeImage (
  IN  EFI_TREE_PROTOCOL         *TreeProtocol,
  IN  EFI_PHYSICAL_ADDRESS      ImageAddress,
  IN  UINTN                     ImageSize,
  IN  UINTN                     LinkTimeBase,
  IN  UINT16                    ImageType,
  IN  EFI_DEVICE_PATH_PROTOCOL  *FilePath
  )
{
  EFI_STATUS                        Status;
  TrEE_EVENT                        *TreeEvent;
  EFI_IMAGE_LOAD_EVENT              *ImageLoad;
  UINT32                            FilePathSize;
  UINT32                            EventSize;

  Status        = EFI_UNSUPPORTED;
  ImageLoad     = NULL;
  FilePathSize  = (UINT32) GetDevicePathSize (FilePath);

  //
  // Determine destination PCR by BootPolicy
  //
  EventSize = sizeof (*ImageLoad) - sizeof (ImageLoad->DevicePath) + FilePathSize;
  TreeEvent = AllocateZeroPool (EventSize + sizeof (TrEE_EVENT) - sizeof(TreeEvent->Event));
  if (TreeEvent == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  TreeEvent->Size = EventSize + sizeof (TrEE_EVENT) - sizeof(TreeEvent->Event);
  TreeEvent->Header.HeaderSize    = sizeof(TrEE_EVENT_HEADER);
  TreeEvent->Header.HeaderVersion = TREE_EVENT_HEADER_VERSION;
  ImageLoad           = (EFI_IMAGE_LOAD_EVENT *) TreeEvent->Event;

  switch (ImageType) {
    case EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION:
      TreeEvent->Header.EventType = EV_EFI_BOOT_SERVICES_APPLICATION;
      TreeEvent->Header.PCRIndex  = 4;
      break;
    case EFI_IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
      TreeEvent->Header.EventType = EV_EFI_BOOT_SERVICES_DRIVER;
      TreeEvent->Header.PCRIndex  = 2;
      break;
    case EFI_IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
      TreeEvent->Header.EventType = EV_EFI_RUNTIME_SERVICES_DRIVER;
      TreeEvent->Header.PCRIndex  = 2;
      break;
    default:
      DEBUG ((
        EFI_D_ERROR,
        "TrEEMeasurePeImage: Unknown subsystem type %d",
        ImageType
        ));
      goto Finish;
  }

  ImageLoad->ImageLocationInMemory = ImageAddress;
  ImageLoad->ImageLengthInMemory   = ImageSize;
  ImageLoad->ImageLinkTimeAddress  = LinkTimeBase;
  ImageLoad->LengthOfDevicePath    = FilePathSize;
  if ((FilePath != NULL) && (FilePathSize != 0)) {
    CopyMem (ImageLoad->DevicePath, FilePath, FilePathSize);
  }

  //
  // Log the PE data
  //
  Status = TreeProtocol->HashLogExtendEvent (
             TreeProtocol,
             PE_COFF_IMAGE,
             ImageAddress,
             ImageSize,
             TreeEvent
             );
  if (Status == EFI_VOLUME_FULL) {
    //
    // Volume full here means the image is hashed and its result is extended to PCR.
    // But the event log cann't be saved since log area is full.
    // Just return EFI_SUCCESS in order not to block the image load.
    //
    Status = EFI_SUCCESS;
  }

Finish:
  FreePool (TreeEvent);

  return Status;
}

/**
  The security handler is used to abstract platform-specific policy 
  from the DXE core response to an attempt to use a file that returns a 
  given status for the authentication check from the section extraction protocol.  

  The possible responses in a given SAP implementation may include locking 
  flash upon failure to authenticate, attestation logging for all signed drivers, 
  and other exception operations.  The File parameter allows for possible logging 
  within the SAP of the driver.

  If File is NULL, then EFI_INVALID_PARAMETER is returned.

  If the file specified by File with an authentication status specified by 
  AuthenticationStatus is safe for the DXE Core to use, then EFI_SUCCESS is returned.

  If the file specified by File with an authentication status specified by 
  AuthenticationStatus is not safe for the DXE Core to use under any circumstances, 
  then EFI_ACCESS_DENIED is returned.

  If the file specified by File with an authentication status specified by 
  AuthenticationStatus is not safe for the DXE Core to use right now, but it 
  might be possible to use it at a future time, then EFI_SECURITY_VIOLATION is 
  returned.

  @param[in]      AuthenticationStatus  This is the authentication status returned
                                        from the securitymeasurement services for the
                                        input file.
  @param[in]      File       This is a pointer to the device path of the file that is
                             being dispatched. This will optionally be used for logging.
  @param[in]      FileBuffer File buffer matches the input file device path.
  @param[in]      FileSize   Size of File buffer matches the input file device path.
  @param[in]      BootPolicy A boot policy that was used to call LoadImage() UEFI service.

  @retval EFI_SUCCESS             The file specified by DevicePath and non-NULL
                                  FileBuffer did authenticate, and the platform policy dictates
                                  that the DXE Foundation may use the file.
  @retval other error value
**/
EFI_STATUS
EFIAPI
DxeTpm2MeasureBootHandler (
  IN  UINT32                           AuthenticationStatus,
  IN  CONST EFI_DEVICE_PATH_PROTOCOL   *File,
  IN  VOID                             *FileBuffer,
  IN  UINTN                            FileSize,
  IN  BOOLEAN                          BootPolicy
  )
{
  EFI_TREE_PROTOCOL                   *TreeProtocol;
  EFI_STATUS                          Status;
  TREE_BOOT_SERVICE_CAPABILITY        ProtocolCapability;
  EFI_DEVICE_PATH_PROTOCOL            *DevicePathNode;
  EFI_DEVICE_PATH_PROTOCOL            *OrigDevicePathNode;
  EFI_HANDLE                          Handle;
  EFI_HANDLE                          TempHandle;
  BOOLEAN                             ApplicationRequired;
  PE_COFF_LOADER_IMAGE_CONTEXT        ImageContext;
  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *FvbProtocol;
  EFI_PHYSICAL_ADDRESS                FvAddress;
  UINT32                              Index;

  Status = gBS->LocateProtocol (&gEfiTrEEProtocolGuid, NULL, (VOID **) &TreeProtocol);
  if (EFI_ERROR (Status)) {
    //
    // TrEE protocol is not installed. So, TPM2 is not present.
    // Don't do any measurement, and directly return EFI_SUCCESS.
    //
    DEBUG ((EFI_D_ERROR, "DxeTpm2MeasureBootHandler - TrEE - %r\n", Status));
    return EFI_SUCCESS;
  }

  ProtocolCapability.Size = (UINT8) sizeof (ProtocolCapability);
  Status = TreeProtocol->GetCapability (
                           TreeProtocol, 
                           &ProtocolCapability
                           );
  if (EFI_ERROR (Status) || !ProtocolCapability.TrEEPresentFlag) {
    //
    // TPM device doesn't work or activate.
    //
    DEBUG ((EFI_D_ERROR, "DxeTpm2MeasureBootHandler (%r) - TrEEPresentFlag - %x\n", Status, ProtocolCapability.TrEEPresentFlag));
    return EFI_SUCCESS;
  }

  //
  // Copy File Device Path
  //
  OrigDevicePathNode = DuplicateDevicePath (File);
  
  //
  // 1. Check whether this device path support BlockIo protocol.
  // Is so, this device path may be a GPT device path.
  //
  DevicePathNode = OrigDevicePathNode;
  Status = gBS->LocateDevicePath (&gEfiBlockIoProtocolGuid, &DevicePathNode, &Handle);
  if (!EFI_ERROR (Status) && !mTrEEMeasureGptTableFlag) {
    //
    // Find the gpt partion on the given devicepath
    //
    DevicePathNode = OrigDevicePathNode;
    ASSERT (DevicePathNode != NULL);
    while (!IsDevicePathEnd (DevicePathNode)) {
      //
      // Find the Gpt partition
      //
      if (DevicePathType (DevicePathNode) == MEDIA_DEVICE_PATH &&
            DevicePathSubType (DevicePathNode) == MEDIA_HARDDRIVE_DP) {
        //
        // Check whether it is a gpt partition or not
        //                           
        if (((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->MBRType == MBR_TYPE_EFI_PARTITION_TABLE_HEADER && 
            ((HARDDRIVE_DEVICE_PATH *) DevicePathNode)->SignatureType == SIGNATURE_TYPE_GUID) {

          //
          // Change the partition device path to its parent device path (disk) and get the handle.
          //
          DevicePathNode->Type    = END_DEVICE_PATH_TYPE;
          DevicePathNode->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
          DevicePathNode          = OrigDevicePathNode;
          Status = gBS->LocateDevicePath (
                         &gEfiDiskIoProtocolGuid,
                         &DevicePathNode,
                         &Handle
                         );
          if (!EFI_ERROR (Status)) {
            //
            // Measure GPT disk.
            //
            Status = TrEEMeasureGptTable (TreeProtocol, Handle);
            DEBUG ((EFI_D_ERROR, "DxeTpm2MeasureBootHandler - TrEEMeasureGptTable - %r\n", Status));
            if (!EFI_ERROR (Status)) {
              //
              // GPT disk check done.
              //
              mTrEEMeasureGptTableFlag = TRUE;
            }
          }
          FreePool (OrigDevicePathNode);
          OrigDevicePathNode = DuplicateDevicePath (File);
          ASSERT (OrigDevicePathNode != NULL);
          break;
        }
      }
      DevicePathNode    = NextDevicePathNode (DevicePathNode);
    }
  }
  
  //
  // 2. Measure PE image.
  //
  ApplicationRequired = FALSE;

  //
  // Check whether this device path support FVB protocol.
  //
  DevicePathNode = OrigDevicePathNode;
  Status = gBS->LocateDevicePath (&gEfiFirmwareVolumeBlockProtocolGuid, &DevicePathNode, &Handle);
  if (!EFI_ERROR (Status)) {
    //
    // Don't check FV image, and directly return EFI_SUCCESS.
    // It can be extended to the specific FV authentication according to the different requirement.
    //
    if (IsDevicePathEnd (DevicePathNode)) {
      return EFI_SUCCESS;
    }
    //
    // The PE image from unmeasured Firmware volume need be measured
    // The PE image from measured Firmware volume will be mearsured according to policy below.
    //   If it is driver, do not measure
    //   If it is application, still measure.
    //
    ApplicationRequired = TRUE;

    if (mTrEECacheMeasuredHandle != Handle && mTrEEMeasuredHobData != NULL) {
      //
      // Search for Root FV of this PE image
      //
      TempHandle = Handle;
      do {
        Status = gBS->HandleProtocol(
                        TempHandle, 
                        &gEfiFirmwareVolumeBlockProtocolGuid,
                        (VOID**)&FvbProtocol
                        );
        TempHandle = FvbProtocol->ParentHandle;
      } while (!EFI_ERROR(Status) && FvbProtocol->ParentHandle != NULL);

      //
      // Search in measured FV Hob
      //
      Status = FvbProtocol->GetPhysicalAddress(FvbProtocol, &FvAddress);
      if (EFI_ERROR(Status)){
        return Status;
      }

      ApplicationRequired = FALSE;

      for (Index = 0; Index < mTrEEMeasuredHobData->Num; Index++) {
        if(mTrEEMeasuredHobData->MeasuredFvBuf[Index].BlobBase == FvAddress) {
          //
          // Cache measured FV for next measurement
          //
          mTrEECacheMeasuredHandle = Handle;
          ApplicationRequired  = TRUE;
          break;
        }
      }
    }
  }

  //
  // File is not found.
  //
  if (FileBuffer == NULL) {
    Status = EFI_SECURITY_VIOLATION;
    goto Finish;
  }

  mTrEEImageSize  = FileSize;
  mTrEEFileBuffer = FileBuffer;

  //
  // Measure PE Image
  //
  DevicePathNode = OrigDevicePathNode;
  ZeroMem (&ImageContext, sizeof (ImageContext));
  ImageContext.Handle    = (VOID *) FileBuffer;
  ImageContext.ImageRead = (PE_COFF_LOADER_READ_FILE) DxeTpm2MeasureBootLibImageRead;

  //
  // Get information about the image being loaded
  //
  Status = PeCoffLoaderGetImageInfo (&ImageContext);
  if (EFI_ERROR (Status)) {
    //
    // The information can't be got from the invalid PeImage
    //
    goto Finish;
  }
  
  //
  // Measure only application if Application flag is set
  // Measure drivers and applications if Application flag is not set
  //
  if ((!ApplicationRequired) || 
        (ApplicationRequired && ImageContext.ImageType == EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION)) {  
    //
    // Print the image path to be measured.
    //    
    DEBUG_CODE_BEGIN ();
      CHAR16                            *ToText;
      ToText = ConvertDevicePathToText (
                 DevicePathNode,
                 FALSE,
                 TRUE
                 );
      if (ToText != NULL) {
        DEBUG ((DEBUG_INFO, "The measured image path is %s.\n", ToText));
        FreePool (ToText);
      }
    DEBUG_CODE_END ();

    //
    // Measure PE image into TPM log.
    //
    Status = TrEEMeasurePeImage (
               TreeProtocol,
               (EFI_PHYSICAL_ADDRESS) (UINTN) FileBuffer, 
               FileSize, 
               (UINTN) ImageContext.ImageAddress, 
               ImageContext.ImageType, 
               DevicePathNode
               );
    DEBUG ((EFI_D_ERROR, "DxeTpm2MeasureBootHandler - TrEEMeasurePeImage - %r\n", Status));
  }

  //
  // Done, free the allocated resource.
  //
Finish:
  if (OrigDevicePathNode != NULL) {
    FreePool (OrigDevicePathNode);
  }

  DEBUG ((EFI_D_ERROR, "DxeTpm2MeasureBootHandler - %r\n", Status));

  return Status;
}

/**
  Register the security handler to provide TPM measure boot service.

  @param  ImageHandle  ImageHandle of the loaded driver.
  @param  SystemTable  Pointer to the EFI System Table.

  @retval  EFI_SUCCESS            Register successfully.
  @retval  EFI_OUT_OF_RESOURCES   No enough memory to register this handler.
**/
EFI_STATUS
EFIAPI
DxeTpm2MeasureBootLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_HOB_GUID_TYPE  *GuidHob;

  GuidHob = NULL;

  GuidHob = GetFirstGuidHob (&gMeasuredFvHobGuid);

  if (GuidHob != NULL) {
    mTrEEMeasuredHobData = GET_GUID_HOB_DATA (GuidHob);
  }

  return RegisterSecurity2Handler (
          DxeTpm2MeasureBootHandler,
          EFI_AUTH_OPERATION_MEASURE_IMAGE | EFI_AUTH_OPERATION_IMAGE_REQUIRED
          );
}