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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 <PiPei.h>
#include <Guid/CcEventHob.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/HashLib.h>
#include <Library/HobLib.h>
#include <Library/PrintLib.h>
#include <IndustryStandard/Tpm20.h>
#include <Protocol/CcMeasurement.h>
#include <Library/TpmMeasurementLib.h>
#pragma pack(1)
typedef struct {
UINT32 Count;
TPMI_ALG_HASH HashAlg;
BYTE Sha384[SHA384_DIGEST_SIZE];
} TDX_DIGEST_VALUE;
#pragma pack()
#define INVALID_PCR2MR_INDEX 0xFF
/**
Get the mapped RTMR index based on the input PCRIndex.
RTMR[0] => PCR[1,7]
RTMR[1] => PCR[2,3,4,5]
RTMR[2] => PCR[8~15]
RTMR[3] => NA
Note:
PCR[0] is mapped to MRTD and should not appear here.
PCR[6] is reserved for OEM. It is not used.
@param[in] PCRIndex The input PCR index
@retval UINT8 The mapped RTMR index.
**/
UINT8
GetMappedRtmrIndex (
IN UINT32 PCRIndex
)
{
UINT8 RtmrIndex;
if ((PCRIndex == 6) || (PCRIndex == 0) || (PCRIndex > 15)) {
DEBUG ((DEBUG_ERROR, "Invalid PCRIndex(%d) map to MR Index.\n", PCRIndex));
ASSERT (FALSE);
return INVALID_PCR2MR_INDEX;
}
RtmrIndex = 0;
if ((PCRIndex == 1) || (PCRIndex == 7)) {
RtmrIndex = 0;
} else if ((PCRIndex >= 2) && (PCRIndex < 6)) {
RtmrIndex = 1;
} else if ((PCRIndex >= 8) && (PCRIndex <= 15)) {
RtmrIndex = 2;
}
return RtmrIndex;
}
/**
Tpm measure and log data, and extend the measurement result into a specific PCR.
@param[in] PcrIndex PCR Index.
@param[in] EventType Event type.
@param[in] EventLog Measurement event log.
@param[in] LogLen Event log length in bytes.
@param[in] HashData The start of the data buffer to be hashed, extended.
@param[in] HashDataLen The length, in bytes, of the buffer referenced by HashData
@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
TpmMeasureAndLogData (
IN UINT32 PcrIndex,
IN UINT32 EventType,
IN VOID *EventLog,
IN UINT32 LogLen,
IN VOID *HashData,
IN UINT64 HashDataLen
)
{
EFI_STATUS Status;
UINT32 RtmrIndex;
VOID *EventHobData;
TCG_PCR_EVENT2 *TcgPcrEvent2;
UINT8 *DigestBuffer;
TDX_DIGEST_VALUE *TdxDigest;
TPML_DIGEST_VALUES DigestList;
UINT8 *Ptr;
if (!TdIsEnabled ()) {
return EFI_UNSUPPORTED;
}
RtmrIndex = GetMappedRtmrIndex (PcrIndex);
if (RtmrIndex == INVALID_PCR2MR_INDEX) {
return EFI_INVALID_PARAMETER;
}
DEBUG ((DEBUG_INFO, "Creating TdTcg2PcrEvent PCR[%d]/RTMR[%d] EventType 0x%x\n", PcrIndex, RtmrIndex, EventType));
Status = HashAndExtend (
RtmrIndex,
(VOID *)HashData,
HashDataLen,
&DigestList
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO, "Failed to HashAndExtend. %r\n", Status));
return Status;
}
//
// Use TDX_DIGEST_VALUE in the GUID HOB DataLength calculation
// to reserve enough buffer to hold TPML_DIGEST_VALUES compact binary
// which is limited to a SHA384 digest list
//
EventHobData = BuildGuidHob (
&gCcEventEntryHobGuid,
sizeof (TcgPcrEvent2->PCRIndex) + sizeof (TcgPcrEvent2->EventType) +
sizeof (TDX_DIGEST_VALUE) +
sizeof (TcgPcrEvent2->EventSize) + LogLen
);
if (EventHobData == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Ptr = (UINT8 *)EventHobData;
//
// Initialize PcrEvent data now
//
RtmrIndex++;
CopyMem (Ptr, &RtmrIndex, sizeof (UINT32));
Ptr += sizeof (UINT32);
CopyMem (Ptr, &EventType, sizeof (TCG_EVENTTYPE));
Ptr += sizeof (TCG_EVENTTYPE);
DigestBuffer = Ptr;
TdxDigest = (TDX_DIGEST_VALUE *)DigestBuffer;
TdxDigest->Count = 1;
TdxDigest->HashAlg = TPM_ALG_SHA384;
CopyMem (
TdxDigest->Sha384,
DigestList.digests[0].digest.sha384,
SHA384_DIGEST_SIZE
);
Ptr += sizeof (TDX_DIGEST_VALUE);
CopyMem (Ptr, &LogLen, sizeof (UINT32));
Ptr += sizeof (UINT32);
CopyMem (Ptr, EventLog, LogLen);
Ptr += LogLen;
Status = EFI_SUCCESS;
return Status;
}
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