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/** @file
This library is used by other modules to measure data to TPM.
Copyright (c) 2020, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi/UefiBaseType.h>
#include <Pi/PiFirmwareVolume.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/ReportStatusCodeLib.h>
#include <Library/PcdLib.h>
#include <Library/PrintLib.h>
#include <Library/TcgEventLogRecordLib.h>
#include <Library/TpmMeasurementLib.h>
#include <IndustryStandard/UefiTcgPlatform.h>
/**
Get the FvName from the FV header.
Causion: The FV is untrusted input.
@param[in] FvBase Base address of FV image.
@param[in] FvLength Length of FV image.
@return FvName pointer
@retval NULL FvName is NOT found
**/
VOID *
TpmMeasurementGetFvName (
IN EFI_PHYSICAL_ADDRESS FvBase,
IN UINT64 FvLength
)
{
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
EFI_FIRMWARE_VOLUME_EXT_HEADER *FvExtHeader;
if (FvBase >= MAX_ADDRESS) {
return NULL;
}
if (FvLength >= MAX_ADDRESS - FvBase) {
return NULL;
}
if (FvLength < sizeof (EFI_FIRMWARE_VOLUME_HEADER)) {
return NULL;
}
FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)FvBase;
if (FvHeader->Signature != EFI_FVH_SIGNATURE) {
return NULL;
}
if (FvHeader->ExtHeaderOffset < sizeof (EFI_FIRMWARE_VOLUME_HEADER)) {
return NULL;
}
if (FvHeader->ExtHeaderOffset + sizeof (EFI_FIRMWARE_VOLUME_EXT_HEADER) > FvLength) {
return NULL;
}
FvExtHeader = (EFI_FIRMWARE_VOLUME_EXT_HEADER *)(UINTN)(FvBase + FvHeader->ExtHeaderOffset);
return &FvExtHeader->FvName;
}
/**
Measure a FirmwareBlob.
@param[in] PcrIndex PcrIndex of the measurement.
@param[in] Description Description for this FirmwareBlob.
@param[in] FirmwareBlobBase Base address of this FirmwareBlob.
@param[in] FirmwareBlobLength Size in bytes of this FirmwareBlob.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_UNSUPPORTED TPM device not available.
@retval EFI_OUT_OF_RESOURCES Out of memory.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureFirmwareBlob (
IN UINT32 PcrIndex,
IN CHAR8 *Description OPTIONAL,
IN EFI_PHYSICAL_ADDRESS FirmwareBlobBase,
IN UINT64 FirmwareBlobLength
)
{
EFI_PLATFORM_FIRMWARE_BLOB FvBlob;
PLATFORM_FIRMWARE_BLOB2_STRUCT FvBlob2;
VOID *FvName;
UINT32 EventType;
VOID *EventLog;
UINT32 EventLogSize;
EFI_STATUS Status;
FvName = TpmMeasurementGetFvName (FirmwareBlobBase, FirmwareBlobLength);
if (((Description != NULL) || (FvName != NULL)) &&
(PcdGet32 (PcdTcgPfpMeasurementRevision) >= TCG_EfiSpecIDEventStruct_SPEC_ERRATA_TPM2_REV_105))
{
if (Description != NULL) {
AsciiSPrint ((CHAR8 *)FvBlob2.BlobDescription, sizeof (FvBlob2.BlobDescription), "%a", Description);
} else {
AsciiSPrint ((CHAR8 *)FvBlob2.BlobDescription, sizeof (FvBlob2.BlobDescription), "Fv(%g)", FvName);
}
FvBlob2.BlobDescriptionSize = sizeof (FvBlob2.BlobDescription);
FvBlob2.BlobBase = FirmwareBlobBase;
FvBlob2.BlobLength = FirmwareBlobLength;
EventType = EV_EFI_PLATFORM_FIRMWARE_BLOB2;
EventLog = &FvBlob2;
EventLogSize = sizeof (FvBlob2);
} else {
FvBlob.BlobBase = FirmwareBlobBase;
FvBlob.BlobLength = FirmwareBlobLength;
EventType = EV_EFI_PLATFORM_FIRMWARE_BLOB;
EventLog = &FvBlob;
EventLogSize = sizeof (FvBlob);
}
Status = TpmMeasureAndLogData (
PcrIndex,
EventType,
EventLog,
EventLogSize,
(VOID *)(UINTN)FirmwareBlobBase,
FirmwareBlobLength
);
return Status;
}
/**
Measure a HandoffTable.
@param[in] PcrIndex PcrIndex of the measurement.
@param[in] Description Description for this HandoffTable.
@param[in] TableGuid GUID of this HandoffTable.
@param[in] TableAddress Base address of this HandoffTable.
@param[in] TableLength Size in bytes of this HandoffTable.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_UNSUPPORTED TPM device not available.
@retval EFI_OUT_OF_RESOURCES Out of memory.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureHandoffTable (
IN UINT32 PcrIndex,
IN CHAR8 *Description OPTIONAL,
IN EFI_GUID *TableGuid,
IN VOID *TableAddress,
IN UINTN TableLength
)
{
EFI_HANDOFF_TABLE_POINTERS HandoffTables;
HANDOFF_TABLE_POINTERS2_STRUCT HandoffTables2;
UINT32 EventType;
VOID *EventLog;
UINT32 EventLogSize;
EFI_STATUS Status;
if ((Description != NULL) &&
(PcdGet32 (PcdTcgPfpMeasurementRevision) >= TCG_EfiSpecIDEventStruct_SPEC_ERRATA_TPM2_REV_105))
{
AsciiSPrint ((CHAR8 *)HandoffTables2.TableDescription, sizeof (HandoffTables2.TableDescription), "%a", Description);
HandoffTables2.TableDescriptionSize = sizeof (HandoffTables2.TableDescription);
HandoffTables2.NumberOfTables = 1;
CopyGuid (&(HandoffTables2.TableEntry[0].VendorGuid), TableGuid);
HandoffTables2.TableEntry[0].VendorTable = TableAddress;
EventType = EV_EFI_HANDOFF_TABLES2;
EventLog = &HandoffTables2;
EventLogSize = sizeof (HandoffTables2);
} else {
HandoffTables.NumberOfTables = 1;
CopyGuid (&(HandoffTables.TableEntry[0].VendorGuid), TableGuid);
HandoffTables.TableEntry[0].VendorTable = TableAddress;
EventType = EV_EFI_HANDOFF_TABLES;
EventLog = &HandoffTables;
EventLogSize = sizeof (HandoffTables);
}
Status = TpmMeasureAndLogData (
PcrIndex,
EventType,
EventLog,
EventLogSize,
TableAddress,
TableLength
);
return Status;
}
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