[mirror_edk2.git] / SecurityPkg / Tcg / Tcg2Pei / Tcg2Pei.c

/** @file\r
  Initialize TPM2 device and measure FVs before handing off control to DXE.\r
\r
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>\r
Copyright (c) 2017, Microsoft Corporation.  All rights reserved. <BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <PiPei.h>\r
\r
#include <IndustryStandard/UefiTcgPlatform.h>\r
#include <Ppi/FirmwareVolumeInfo.h>\r
#include <Ppi/FirmwareVolumeInfo2.h>\r
#include <Ppi/TpmInitialized.h>\r
#include <Ppi/FirmwareVolume.h>\r
#include <Ppi/EndOfPeiPhase.h>\r
#include <Ppi/FirmwareVolumeInfoMeasurementExcluded.h>\r
#include <Ppi/FirmwareVolumeInfoPrehashedFV.h>\r
\r
#include <Guid/TcgEventHob.h>\r
#include <Guid/MeasuredFvHob.h>\r
#include <Guid/TpmInstance.h>\r
\r
#include <Library/DebugLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Library/PeimEntryPoint.h>\r
#include <Library/Tpm2CommandLib.h>\r
#include <Library/Tpm2DeviceLib.h>\r
#include <Library/HashLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/PeiServicesTablePointerLib.h>\r
#include <Protocol/Tcg2Protocol.h>\r
#include <Library/PerformanceLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/ReportStatusCodeLib.h>\r
#include <Library/ResetSystemLib.h>\r
\r
#define PERF_ID_TCG2_PEI  0x3080\r
\r
typedef struct {\r
  EFI_GUID                   *EventGuid;\r
  EFI_TCG2_EVENT_LOG_FORMAT  LogFormat;\r
} TCG2_EVENT_INFO_STRUCT;\r
\r
TCG2_EVENT_INFO_STRUCT mTcg2EventInfo[] = {\r
  {&gTcgEventEntryHobGuid,   EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2},\r
  {&gTcgEvent2EntryHobGuid,  EFI_TCG2_EVENT_LOG_FORMAT_TCG_2},\r
};\r
\r
BOOLEAN                 mImageInMemory  = FALSE;\r
EFI_PEI_FILE_HANDLE     mFileHandle;\r
\r
EFI_PEI_PPI_DESCRIPTOR  mTpmInitializedPpiList = {\r
  EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gPeiTpmInitializedPpiGuid,\r
  NULL\r
};\r
\r
EFI_PEI_PPI_DESCRIPTOR  mTpmInitializationDonePpiList = {\r
  EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gPeiTpmInitializationDonePpiGuid,\r
  NULL\r
};\r
\r
//\r
// Number of firmware blobs to grow by each time we run out of room\r
//\r
#define FIRMWARE_BLOB_GROWTH_STEP 4\r
\r
EFI_PLATFORM_FIRMWARE_BLOB *mMeasuredBaseFvInfo;\r
UINT32 mMeasuredMaxBaseFvIndex = 0;\r
UINT32 mMeasuredBaseFvIndex = 0;\r
\r
EFI_PLATFORM_FIRMWARE_BLOB *mMeasuredChildFvInfo;\r
UINT32 mMeasuredMaxChildFvIndex = 0;\r
UINT32 mMeasuredChildFvIndex = 0;\r
\r
/**\r
  Measure and record the Firmware Volume Information once FvInfoPPI install.\r
\r
  @param[in] PeiServices       An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.\r
  @param[in] NotifyDescriptor  Address of the notification descriptor data structure.\r
  @param[in] Ppi               Address of the PPI that was installed.\r
\r
  @retval EFI_SUCCESS          The FV Info is measured and recorded to TPM.\r
  @return Others               Fail to measure FV.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
FirmwareVolumeInfoPpiNotifyCallback (\r
  IN EFI_PEI_SERVICES              **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR     *NotifyDescriptor,\r
  IN VOID                          *Ppi\r
  );\r
\r
/**\r
  Record all measured Firmware Volume Information into a Guid Hob\r
\r
  @param[in] PeiServices       An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.\r
  @param[in] NotifyDescriptor  Address of the notification descriptor data structure.\r
  @param[in] Ppi               Address of the PPI that was installed.\r
\r
  @retval EFI_SUCCESS          The FV Info is measured and recorded to TPM.\r
  @return Others               Fail to measure FV.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EndofPeiSignalNotifyCallBack (\r
  IN EFI_PEI_SERVICES              **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR     *NotifyDescriptor,\r
  IN VOID                          *Ppi\r
  );\r
\r
EFI_PEI_NOTIFY_DESCRIPTOR           mNotifyList[] = {\r
  {\r
    EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,\r
    &gEfiPeiFirmwareVolumeInfoPpiGuid,\r
    FirmwareVolumeInfoPpiNotifyCallback\r
  },\r
  {\r
    EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,\r
    &gEfiPeiFirmwareVolumeInfo2PpiGuid,\r
    FirmwareVolumeInfoPpiNotifyCallback\r
  },\r
  {\r
    (EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r
    &gEfiEndOfPeiSignalPpiGuid,\r
    EndofPeiSignalNotifyCallBack\r
  }\r
};\r
\r
\r
/**\r
  Record all measured Firmware Volume Information into a Guid Hob\r
  Guid Hob payload layout is\r
\r
     UINT32 *************************** FIRMWARE_BLOB number\r
     EFI_PLATFORM_FIRMWARE_BLOB******** BLOB Array\r
\r
  @param[in] PeiServices       An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.\r
  @param[in] NotifyDescriptor  Address of the notification descriptor data structure.\r
  @param[in] Ppi               Address of the PPI that was installed.\r
\r
  @retval EFI_SUCCESS          The FV Info is measured and recorded to TPM.\r
  @return Others               Fail to measure FV.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EndofPeiSignalNotifyCallBack (\r
  IN EFI_PEI_SERVICES              **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR     *NotifyDescriptor,\r
  IN VOID                          *Ppi\r
  )\r
{\r
  MEASURED_HOB_DATA *MeasuredHobData;\r
\r
  MeasuredHobData = NULL;\r
\r
  PERF_CALLBACK_BEGIN (&gEfiEndOfPeiSignalPpiGuid);\r
\r
  //\r
  // Create a Guid hob to save all measured Fv\r
  //\r
  MeasuredHobData = BuildGuidHob(\r
                      &gMeasuredFvHobGuid,\r
                      sizeof(UINTN) + sizeof(EFI_PLATFORM_FIRMWARE_BLOB) * (mMeasuredBaseFvIndex + mMeasuredChildFvIndex)\r
                      );\r
\r
  if (MeasuredHobData != NULL){\r
    //\r
    // Save measured FV info enty number\r
    //\r
    MeasuredHobData->Num = mMeasuredBaseFvIndex + mMeasuredChildFvIndex;\r
\r
    //\r
    // Save measured base Fv info\r
    //\r
    CopyMem (MeasuredHobData->MeasuredFvBuf, mMeasuredBaseFvInfo, sizeof(EFI_PLATFORM_FIRMWARE_BLOB) * (mMeasuredBaseFvIndex));\r
\r
    //\r
    // Save measured child Fv info\r
    //\r
    CopyMem (&MeasuredHobData->MeasuredFvBuf[mMeasuredBaseFvIndex] , mMeasuredChildFvInfo, sizeof(EFI_PLATFORM_FIRMWARE_BLOB) * (mMeasuredChildFvIndex));\r
  }\r
\r
  PERF_CALLBACK_END (&gEfiEndOfPeiSignalPpiGuid);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Make sure that the current PCR allocations, the TPM supported PCRs,\r
  and the PcdTpm2HashMask are all in agreement.\r
**/\r
VOID\r
SyncPcrAllocationsAndPcrMask (\r
  VOID\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  EFI_TCG2_EVENT_ALGORITHM_BITMAP   TpmHashAlgorithmBitmap;\r
  UINT32                            TpmActivePcrBanks;\r
  UINT32                            NewTpmActivePcrBanks;\r
  UINT32                            Tpm2PcrMask;\r
  UINT32                            NewTpm2PcrMask;\r
\r
  DEBUG ((EFI_D_ERROR, "SyncPcrAllocationsAndPcrMask!\n"));\r
\r
  //\r
  // Determine the current TPM support and the Platform PCR mask.\r
  //\r
  Status = Tpm2GetCapabilitySupportedAndActivePcrs (&TpmHashAlgorithmBitmap, &TpmActivePcrBanks);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Tpm2PcrMask = PcdGet32 (PcdTpm2HashMask);\r
  if (Tpm2PcrMask == 0) {\r
    //\r
    // if PcdTPm2HashMask is zero, use ActivePcr setting\r
    //\r
    PcdSet32S (PcdTpm2HashMask, TpmActivePcrBanks);\r
    Tpm2PcrMask = TpmActivePcrBanks;\r
  }\r
\r
  //\r
  // Find the intersection of Pcd support and TPM support.\r
  // If banks are missing from the TPM support that are in the PCD, update the PCD.\r
  // If banks are missing from the PCD that are active in the TPM, reallocate the banks and reboot.\r
  //\r
\r
  //\r
  // If there are active PCR banks that are not supported by the Platform mask,\r
  // update the TPM allocations and reboot the machine.\r
  //\r
  if ((TpmActivePcrBanks & Tpm2PcrMask) != TpmActivePcrBanks) {\r
    NewTpmActivePcrBanks = TpmActivePcrBanks & Tpm2PcrMask;\r
\r
    DEBUG ((EFI_D_INFO, "%a - Reallocating PCR banks from 0x%X to 0x%X.\n", __FUNCTION__, TpmActivePcrBanks, NewTpmActivePcrBanks));\r
    if (NewTpmActivePcrBanks == 0) {\r
      DEBUG ((EFI_D_ERROR, "%a - No viable PCRs active! Please set a less restrictive value for PcdTpm2HashMask!\n", __FUNCTION__));\r
      ASSERT (FALSE);\r
    } else {\r
      Status = Tpm2PcrAllocateBanks (NULL, (UINT32)TpmHashAlgorithmBitmap, NewTpmActivePcrBanks);\r
      if (EFI_ERROR (Status)) {\r
        //\r
        // We can't do much here, but we hope that this doesn't happen.\r
        //\r
        DEBUG ((EFI_D_ERROR, "%a - Failed to reallocate PCRs!\n", __FUNCTION__));\r
        ASSERT_EFI_ERROR (Status);\r
      }\r
      //\r
      // Need reset system, since we just called Tpm2PcrAllocateBanks().\r
      //\r
      ResetCold();\r
    }\r
  }\r
\r
  //\r
  // If there are any PCRs that claim support in the Platform mask that are\r
  // not supported by the TPM, update the mask.\r
  //\r
  if ((Tpm2PcrMask & TpmHashAlgorithmBitmap) != Tpm2PcrMask) {\r
    NewTpm2PcrMask = Tpm2PcrMask & TpmHashAlgorithmBitmap;\r
\r
    DEBUG ((EFI_D_INFO, "%a - Updating PcdTpm2HashMask from 0x%X to 0x%X.\n", __FUNCTION__, Tpm2PcrMask, NewTpm2PcrMask));\r
    if (NewTpm2PcrMask == 0) {\r
      DEBUG ((EFI_D_ERROR, "%a - No viable PCRs supported! Please set a less restrictive value for PcdTpm2HashMask!\n", __FUNCTION__));\r
      ASSERT (FALSE);\r
    }\r
\r
    Status = PcdSet32S (PcdTpm2HashMask, NewTpm2PcrMask);\r
    ASSERT_EFI_ERROR (Status);\r
  }\r
}\r
\r
/**\r
  Add a new entry to the Event Log.\r
\r
  @param[in]     DigestList    A list of digest.\r
  @param[in,out] NewEventHdr   Pointer to a TCG_PCR_EVENT_HDR data structure.\r
  @param[in]     NewEventData  Pointer to the new event data.\r
\r
  @retval EFI_SUCCESS           The new event log entry was added.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
**/\r
EFI_STATUS\r
LogHashEvent (\r
  IN TPML_DIGEST_VALUES             *DigestList,\r
  IN OUT  TCG_PCR_EVENT_HDR         *NewEventHdr,\r
  IN      UINT8                     *NewEventData\r
  )\r
{\r
  VOID                              *HobData;\r
  EFI_STATUS                        Status;\r
  UINTN                             Index;\r
  EFI_STATUS                        RetStatus;\r
  UINT32                            SupportedEventLogs;\r
  TCG_PCR_EVENT2                    *TcgPcrEvent2;\r
  UINT8                             *DigestBuffer;\r
\r
  SupportedEventLogs = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 | EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;\r
\r
  RetStatus = EFI_SUCCESS;\r
  for (Index = 0; Index < sizeof(mTcg2EventInfo)/sizeof(mTcg2EventInfo[0]); Index++) {\r
    if ((SupportedEventLogs & mTcg2EventInfo[Index].LogFormat) != 0) {\r
      DEBUG ((EFI_D_INFO, "  LogFormat - 0x%08x\n", mTcg2EventInfo[Index].LogFormat));\r
      switch (mTcg2EventInfo[Index].LogFormat) {\r
      case EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2:\r
        Status = GetDigestFromDigestList (TPM_ALG_SHA1, DigestList, &NewEventHdr->Digest);\r
        if (!EFI_ERROR (Status)) {\r
          HobData = BuildGuidHob (\r
                     &gTcgEventEntryHobGuid,\r
                     sizeof (*NewEventHdr) + NewEventHdr->EventSize\r
                     );\r
          if (HobData == NULL) {\r
            RetStatus = EFI_OUT_OF_RESOURCES;\r
            break;\r
          }\r
\r
          CopyMem (HobData, NewEventHdr, sizeof (*NewEventHdr));\r
          HobData = (VOID *) ((UINT8*)HobData + sizeof (*NewEventHdr));\r
          CopyMem (HobData, NewEventData, NewEventHdr->EventSize);\r
        }\r
        break;\r
      case EFI_TCG2_EVENT_LOG_FORMAT_TCG_2:\r
        //\r
        // Use GetDigestListSize (DigestList) in the GUID HOB DataLength calculation\r
        // to reserve enough buffer to hold TPML_DIGEST_VALUES compact binary.\r
        //\r
        HobData = BuildGuidHob (\r
                   &gTcgEvent2EntryHobGuid,\r
                   sizeof(TcgPcrEvent2->PCRIndex) + sizeof(TcgPcrEvent2->EventType) + GetDigestListSize (DigestList) + sizeof(TcgPcrEvent2->EventSize) + NewEventHdr->EventSize\r
                   );\r
        if (HobData == NULL) {\r
          RetStatus = EFI_OUT_OF_RESOURCES;\r
          break;\r
        }\r
\r
        TcgPcrEvent2 = HobData;\r
        TcgPcrEvent2->PCRIndex = NewEventHdr->PCRIndex;\r
        TcgPcrEvent2->EventType = NewEventHdr->EventType;\r
        DigestBuffer = (UINT8 *)&TcgPcrEvent2->Digest;\r
        DigestBuffer = CopyDigestListToBuffer (DigestBuffer, DigestList, PcdGet32 (PcdTpm2HashMask));\r
        CopyMem (DigestBuffer, &NewEventHdr->EventSize, sizeof(TcgPcrEvent2->EventSize));\r
        DigestBuffer = DigestBuffer + sizeof(TcgPcrEvent2->EventSize);\r
        CopyMem (DigestBuffer, NewEventData, NewEventHdr->EventSize);\r
        break;\r
      }\r
    }\r
  }\r
\r
  return RetStatus;\r
}\r
\r
/**\r
  Do a hash operation on a data buffer, extend a specific TPM PCR with the hash result,\r
  and build a GUIDed HOB recording the event which will be passed to the DXE phase and\r
  added into the Event Log.\r
\r
  @param[in]      Flags         Bitmap providing additional information.\r
  @param[in]      HashData      Physical address of the start of the data buffer\r
                                to be hashed, extended, and logged.\r
  @param[in]      HashDataLen   The length, in bytes, of the buffer referenced by HashData.\r
  @param[in]      NewEventHdr   Pointer to a TCG_PCR_EVENT_HDR data structure.\r
  @param[in]      NewEventData  Pointer to the new event data.\r
\r
  @retval EFI_SUCCESS           Operation completed successfully.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
  @retval EFI_DEVICE_ERROR      The command was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
HashLogExtendEvent (\r
  IN      UINT64                    Flags,\r
  IN      UINT8                     *HashData,\r
  IN      UINTN                     HashDataLen,\r
  IN      TCG_PCR_EVENT_HDR         *NewEventHdr,\r
  IN      UINT8                     *NewEventData\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  TPML_DIGEST_VALUES                DigestList;\r
\r
  if (GetFirstGuidHob (&gTpmErrorHobGuid) != NULL) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Status = HashAndExtend (\r
             NewEventHdr->PCRIndex,\r
             HashData,\r
             HashDataLen,\r
             &DigestList\r
             );\r
  if (!EFI_ERROR (Status)) {\r
    if ((Flags & EFI_TCG2_EXTEND_ONLY) == 0) {\r
      Status = LogHashEvent (&DigestList, NewEventHdr, NewEventData);\r
    }\r
  }\r
\r
  if (Status == EFI_DEVICE_ERROR) {\r
    DEBUG ((EFI_D_ERROR, "HashLogExtendEvent - %r. Disable TPM.\n", Status));\r
    BuildGuidHob (&gTpmErrorHobGuid,0);\r
    REPORT_STATUS_CODE (\r
      EFI_ERROR_CODE | EFI_ERROR_MINOR,\r
      (PcdGet32 (PcdStatusCodeSubClassTpmDevice) | EFI_P_EC_INTERFACE_ERROR)\r
      );\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Measure CRTM version.\r
\r
  @retval EFI_SUCCESS           Operation completed successfully.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
  @retval EFI_DEVICE_ERROR      The command was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
MeasureCRTMVersion (\r
  VOID\r
  )\r
{\r
  TCG_PCR_EVENT_HDR                 TcgEventHdr;\r
\r
  //\r
  // Use FirmwareVersion string to represent CRTM version.\r
  // OEMs should get real CRTM version string and measure it.\r
  //\r
\r
  TcgEventHdr.PCRIndex  = 0;\r
  TcgEventHdr.EventType = EV_S_CRTM_VERSION;\r
  TcgEventHdr.EventSize = (UINT32) StrSize((CHAR16*)PcdGetPtr (PcdFirmwareVersionString));\r
\r
  return HashLogExtendEvent (\r
           0,\r
           (UINT8*)PcdGetPtr (PcdFirmwareVersionString),\r
           TcgEventHdr.EventSize,\r
           &TcgEventHdr,\r
           (UINT8*)PcdGetPtr (PcdFirmwareVersionString)\r
           );\r
}\r
\r
/**\r
  Measure FV image.\r
  Add it into the measured FV list after the FV is measured successfully.\r
\r
  @param[in]  FvBase            Base address of FV image.\r
  @param[in]  FvLength          Length of FV image.\r
\r
  @retval EFI_SUCCESS           Fv image is measured successfully\r
                                or it has been already measured.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
  @retval EFI_DEVICE_ERROR      The command was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
MeasureFvImage (\r
  IN EFI_PHYSICAL_ADDRESS           FvBase,\r
  IN UINT64                         FvLength\r
  )\r
{\r
  UINT32                                                Index;\r
  EFI_STATUS                                            Status;\r
  EFI_PLATFORM_FIRMWARE_BLOB                            FvBlob;\r
  TCG_PCR_EVENT_HDR                                     TcgEventHdr;\r
  UINT32                                                Instance;\r
  UINT32                                                Tpm2HashMask;\r
  TPML_DIGEST_VALUES                                    DigestList;\r
  UINT32                                                DigestCount;\r
  EFI_PEI_FIRMWARE_VOLUME_INFO_MEASUREMENT_EXCLUDED_PPI *MeasurementExcludedFvPpi;\r
  EDKII_PEI_FIRMWARE_VOLUME_INFO_PREHASHED_FV_PPI       *PrehashedFvPpi;\r
  HASH_INFO                                             *PreHashInfo;\r
  UINT32                                                HashAlgoMask;\r
\r
  //\r
  // Check Excluded FV list\r
  //\r
  Instance = 0;\r
  do {\r
    Status = PeiServicesLocatePpi(\r
                 &gEfiPeiFirmwareVolumeInfoMeasurementExcludedPpiGuid,\r
                 Instance,\r
                 NULL,\r
                 (VOID**)&MeasurementExcludedFvPpi\r
                 );\r
    if (!EFI_ERROR(Status)) {\r
      for (Index = 0; Index < MeasurementExcludedFvPpi->Count; Index ++) {\r
        if (MeasurementExcludedFvPpi->Fv[Index].FvBase == FvBase\r
         && MeasurementExcludedFvPpi->Fv[Index].FvLength == FvLength) {\r
          DEBUG ((DEBUG_INFO, "The FV which is excluded by Tcg2Pei starts at: 0x%x\n", FvBase));\r
          DEBUG ((DEBUG_INFO, "The FV which is excluded by Tcg2Pei has the size: 0x%x\n", FvLength));\r
          return EFI_SUCCESS;\r
        }\r
      }\r
\r
      Instance++;\r
    }\r
  } while (!EFI_ERROR(Status));\r
\r
  //\r
  // Check measured FV list\r
  //\r
  for (Index = 0; Index < mMeasuredBaseFvIndex; Index ++) {\r
    if (mMeasuredBaseFvInfo[Index].BlobBase == FvBase && mMeasuredBaseFvInfo[Index].BlobLength == FvLength) {\r
      DEBUG ((DEBUG_INFO, "The FV which is already measured by Tcg2Pei starts at: 0x%x\n", FvBase));\r
      DEBUG ((DEBUG_INFO, "The FV which is already measured by Tcg2Pei has the size: 0x%x\n", FvLength));\r
      return EFI_SUCCESS;\r
    }\r
  }\r
\r
  //\r
  // Check pre-hashed FV list\r
  //\r
  Instance     = 0;\r
  Tpm2HashMask = PcdGet32 (PcdTpm2HashMask);\r
  do {\r
    Status = PeiServicesLocatePpi (\r
               &gEdkiiPeiFirmwareVolumeInfoPrehashedFvPpiGuid,\r
               Instance,\r
               NULL,\r
               (VOID**)&PrehashedFvPpi\r
               );\r
    if (!EFI_ERROR(Status) && PrehashedFvPpi->FvBase == FvBase && PrehashedFvPpi->FvLength == FvLength) {\r
      ZeroMem (&DigestList, sizeof(TPML_DIGEST_VALUES));\r
\r
      //\r
      // The FV is prehashed, check against TPM hash mask\r
      //\r
      PreHashInfo = (HASH_INFO *)(PrehashedFvPpi + 1);\r
      for (Index = 0, DigestCount = 0; Index < PrehashedFvPpi->Count; Index++) {\r
        DEBUG((DEBUG_INFO, "Hash Algo ID in PrehashedFvPpi=0x%x\n", PreHashInfo->HashAlgoId));\r
        HashAlgoMask = GetHashMaskFromAlgo(PreHashInfo->HashAlgoId);\r
        if ((Tpm2HashMask & HashAlgoMask) != 0 ) {\r
          //\r
          // Hash is required, copy it to DigestList\r
          //\r
          WriteUnaligned16(&(DigestList.digests[DigestCount].hashAlg), PreHashInfo->HashAlgoId);\r
          CopyMem (\r
            &DigestList.digests[DigestCount].digest,\r
            PreHashInfo + 1,\r
            PreHashInfo->HashSize\r
            );\r
          DigestCount++;\r
          //\r
          // Clean the corresponding Hash Algo mask bit\r
          //\r
          Tpm2HashMask &= ~HashAlgoMask;\r
        }\r
        PreHashInfo = (HASH_INFO *)((UINT8 *)(PreHashInfo + 1) + PreHashInfo->HashSize);\r
      }\r
\r
      WriteUnaligned32(&DigestList.count, DigestCount);\r
\r
      break;\r
    }\r
    Instance++;\r
  } while (!EFI_ERROR(Status));\r
\r
  //\r
  // Init the log event for FV measurement\r
  //\r
  FvBlob.BlobBase       = FvBase;\r
  FvBlob.BlobLength     = FvLength;\r
  TcgEventHdr.PCRIndex  = 0;\r
  TcgEventHdr.EventType = EV_EFI_PLATFORM_FIRMWARE_BLOB;\r
  TcgEventHdr.EventSize = sizeof (FvBlob);\r
\r
  if (Tpm2HashMask == 0) {\r
    //\r
    // FV pre-hash algos comply with current TPM hash requirement\r
    // Skip hashing step in measure, only extend DigestList to PCR and log event\r
    //\r
    Status = Tpm2PcrExtend(\r
               0,\r
               &DigestList\r
               );\r
\r
    if (!EFI_ERROR(Status)) {\r
       Status = LogHashEvent (&DigestList, &TcgEventHdr, (UINT8*) &FvBlob);\r
       DEBUG ((DEBUG_INFO, "The pre-hashed FV which is extended & logged by Tcg2Pei starts at: 0x%x\n", FvBlob.BlobBase));\r
       DEBUG ((DEBUG_INFO, "The pre-hashed FV which is extended & logged by Tcg2Pei has the size: 0x%x\n", FvBlob.BlobLength));\r
    } else if (Status == EFI_DEVICE_ERROR) {\r
      BuildGuidHob (&gTpmErrorHobGuid,0);\r
      REPORT_STATUS_CODE (\r
        EFI_ERROR_CODE | EFI_ERROR_MINOR,\r
        (PcdGet32 (PcdStatusCodeSubClassTpmDevice) | EFI_P_EC_INTERFACE_ERROR)\r
        );\r
    }\r
  } else {\r
    //\r
    // Hash the FV, extend digest to the TPM and log TCG event\r
    //\r
    Status = HashLogExtendEvent (\r
               0,\r
               (UINT8*) (UINTN) FvBlob.BlobBase,\r
               (UINTN) FvBlob.BlobLength,\r
               &TcgEventHdr,\r
               (UINT8*) &FvBlob\r
               );\r
    DEBUG ((DEBUG_INFO, "The FV which is measured by Tcg2Pei starts at: 0x%x\n", FvBlob.BlobBase));\r
    DEBUG ((DEBUG_INFO, "The FV which is measured by Tcg2Pei has the size: 0x%x\n", FvBlob.BlobLength));\r
  }\r
\r
  if (EFI_ERROR(Status)) {\r
    DEBUG ((DEBUG_ERROR, "The FV which failed to be measured starts at: 0x%x\n", FvBase));\r
    return Status;\r
  }\r
\r
  //\r
  // Add new FV into the measured FV list.\r
  //\r
  if (mMeasuredBaseFvIndex >= mMeasuredMaxBaseFvIndex) {\r
    mMeasuredBaseFvInfo = ReallocatePool (\r
                            sizeof (EFI_PLATFORM_FIRMWARE_BLOB) * mMeasuredMaxBaseFvIndex,\r
                            sizeof (EFI_PLATFORM_FIRMWARE_BLOB) * (mMeasuredMaxBaseFvIndex + FIRMWARE_BLOB_GROWTH_STEP),\r
                            mMeasuredBaseFvInfo\r
                            );\r
    ASSERT (mMeasuredBaseFvInfo != NULL);\r
    mMeasuredMaxBaseFvIndex = mMeasuredMaxBaseFvIndex + FIRMWARE_BLOB_GROWTH_STEP;\r
  }\r
\r
  mMeasuredBaseFvInfo[mMeasuredBaseFvIndex].BlobBase   = FvBase;\r
  mMeasuredBaseFvInfo[mMeasuredBaseFvIndex].BlobLength = FvLength;\r
  mMeasuredBaseFvIndex++;\r
\r
  return Status;\r
}\r
\r
/**\r
  Measure main BIOS.\r
\r
  @retval EFI_SUCCESS           Operation completed successfully.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
  @retval EFI_DEVICE_ERROR      The command was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
MeasureMainBios (\r
  VOID\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  EFI_PEI_FV_HANDLE                 VolumeHandle;\r
  EFI_FV_INFO                       VolumeInfo;\r
  EFI_PEI_FIRMWARE_VOLUME_PPI       *FvPpi;\r
\r
  PERF_START_EX (mFileHandle, "EventRec", "Tcg2Pei", 0, PERF_ID_TCG2_PEI);\r
\r
  //\r
  // Only measure BFV at the very beginning. Other parts of Static Core Root of\r
  // Trust for Measurement(S-CRTM) will be measured later on FvInfoNotify.\r
  // BFV is processed without installing FV Info Ppi. Other FVs either inside BFV or\r
  // reported by platform will be installed with Fv Info Ppi\r
  // This firmware volume measure policy can be modified/enhanced by special\r
  // platform for special CRTM TPM measuring.\r
  //\r
  Status = PeiServicesFfsFindNextVolume (0, &VolumeHandle);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Measure and record the firmware volume that is dispatched by PeiCore\r
  //\r
  Status = PeiServicesFfsGetVolumeInfo (VolumeHandle, &VolumeInfo);\r
  ASSERT_EFI_ERROR (Status);\r
  //\r
  // Locate the corresponding FV_PPI according to founded FV's format guid\r
  //\r
  Status = PeiServicesLocatePpi (\r
             &VolumeInfo.FvFormat,\r
             0,\r
             NULL,\r
             (VOID**)&FvPpi\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = MeasureFvImage ((EFI_PHYSICAL_ADDRESS) (UINTN) VolumeInfo.FvStart, VolumeInfo.FvSize);\r
\r
  PERF_END_EX (mFileHandle, "EventRec", "Tcg2Pei", 0, PERF_ID_TCG2_PEI + 1);\r
\r
  return Status;\r
}\r
\r
/**\r
  Measure and record the Firmware Volume Information once FvInfoPPI install.\r
\r
  @param[in] PeiServices       An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.\r
  @param[in] NotifyDescriptor  Address of the notification descriptor data structure.\r
  @param[in] Ppi               Address of the PPI that was installed.\r
\r
  @retval EFI_SUCCESS          The FV Info is measured and recorded to TPM.\r
  @return Others               Fail to measure FV.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
FirmwareVolumeInfoPpiNotifyCallback (\r
  IN EFI_PEI_SERVICES               **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR      *NotifyDescriptor,\r
  IN VOID                           *Ppi\r
  )\r
{\r
  EFI_PEI_FIRMWARE_VOLUME_INFO_PPI  *Fv;\r
  EFI_STATUS                        Status;\r
  EFI_PEI_FIRMWARE_VOLUME_PPI       *FvPpi;\r
  UINTN                             Index;\r
\r
  Fv = (EFI_PEI_FIRMWARE_VOLUME_INFO_PPI *) Ppi;\r
\r
  //\r
  // The PEI Core can not dispatch or load files from memory mapped FVs that do not support FvPpi.\r
  //\r
  Status = PeiServicesLocatePpi (\r
             &Fv->FvFormat,\r
             0,\r
             NULL,\r
             (VOID**)&FvPpi\r
             );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  //\r
  // This is an FV from an FFS file, and the parent FV must have already been measured,\r
  // No need to measure twice, so just record the FV and return\r
  //\r
  if (Fv->ParentFvName != NULL || Fv->ParentFileName != NULL ) {\r
\r
    if (mMeasuredChildFvIndex >= mMeasuredMaxChildFvIndex) {\r
      mMeasuredChildFvInfo = ReallocatePool (\r
                               sizeof (EFI_PLATFORM_FIRMWARE_BLOB) * mMeasuredMaxChildFvIndex,\r
                               sizeof (EFI_PLATFORM_FIRMWARE_BLOB) * (mMeasuredMaxChildFvIndex + FIRMWARE_BLOB_GROWTH_STEP),\r
                               mMeasuredChildFvInfo\r
                               );\r
      ASSERT (mMeasuredChildFvInfo != NULL);\r
      mMeasuredMaxChildFvIndex = mMeasuredMaxChildFvIndex + FIRMWARE_BLOB_GROWTH_STEP;\r
    }\r
    //\r
    // Check whether FV is in the measured child FV list.\r
    //\r
    for (Index = 0; Index < mMeasuredChildFvIndex; Index++) {\r
      if (mMeasuredChildFvInfo[Index].BlobBase == (EFI_PHYSICAL_ADDRESS) (UINTN) Fv->FvInfo) {\r
        return EFI_SUCCESS;\r
      }\r
    }\r
    mMeasuredChildFvInfo[mMeasuredChildFvIndex].BlobBase   = (EFI_PHYSICAL_ADDRESS) (UINTN) Fv->FvInfo;\r
    mMeasuredChildFvInfo[mMeasuredChildFvIndex].BlobLength = Fv->FvInfoSize;\r
    mMeasuredChildFvIndex++;\r
    return EFI_SUCCESS;\r
  }\r
\r
  return MeasureFvImage ((EFI_PHYSICAL_ADDRESS) (UINTN) Fv->FvInfo, Fv->FvInfoSize);\r
}\r
\r
/**\r
  Do measurement after memory is ready.\r
\r
  @param[in]      PeiServices   Describes the list of possible PEI Services.\r
\r
  @retval EFI_SUCCESS           Operation completed successfully.\r
  @retval EFI_OUT_OF_RESOURCES  No enough memory to log the new event.\r
  @retval EFI_DEVICE_ERROR      The command was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
PeimEntryMP (\r
  IN      EFI_PEI_SERVICES          **PeiServices\r
  )\r
{\r
  EFI_STATUS                        Status;\r
\r
  if (PcdGet8 (PcdTpm2ScrtmPolicy) == 1) {\r
    Status = MeasureCRTMVersion ();\r
  }\r
\r
  Status = MeasureMainBios ();\r
  if (EFI_ERROR(Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Post callbacks:\r
  // for the FvInfoPpi services to measure and record\r
  // the additional Fvs to TPM\r
  //\r
  Status = PeiServicesNotifyPpi (&mNotifyList[0]);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r
\r
/**\r
  Measure and log Separator event with error, and extend the measurement result into a specific PCR.\r
\r
  @param[in] PCRIndex         PCR index.\r
\r
  @retval EFI_SUCCESS         Operation completed successfully.\r
  @retval EFI_DEVICE_ERROR    The operation was unsuccessful.\r
\r
**/\r
EFI_STATUS\r
MeasureSeparatorEventWithError (\r
  IN      TPM_PCRINDEX              PCRIndex\r
  )\r
{\r
  TCG_PCR_EVENT_HDR                 TcgEvent;\r
  UINT32                            EventData;\r
\r
  //\r
  // Use EventData 0x1 to indicate there is error.\r
  //\r
  EventData = 0x1;\r
  TcgEvent.PCRIndex  = PCRIndex;\r
  TcgEvent.EventType = EV_SEPARATOR;\r
  TcgEvent.EventSize = (UINT32)sizeof (EventData);\r
  return HashLogExtendEvent(0,(UINT8 *)&EventData, TcgEvent.EventSize, &TcgEvent,(UINT8 *)&EventData);\r
}\r
\r
/**\r
  Entry point of this module.\r
\r
  @param[in] FileHandle   Handle of the file being invoked.\r
  @param[in] PeiServices  Describes the list of possible PEI Services.\r
\r
  @return Status.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PeimEntryMA (\r
  IN       EFI_PEI_FILE_HANDLE      FileHandle,\r
  IN CONST EFI_PEI_SERVICES         **PeiServices\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  EFI_STATUS                        Status2;\r
  EFI_BOOT_MODE                     BootMode;\r
  TPM_PCRINDEX                      PcrIndex;\r
  BOOLEAN                           S3ErrorReport;\r
\r
  if (CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceNoneGuid) ||\r
      CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)){\r
    DEBUG ((DEBUG_INFO, "No TPM2 instance required!\n"));\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  if (GetFirstGuidHob (&gTpmErrorHobGuid) != NULL) {\r
    DEBUG ((EFI_D_ERROR, "TPM2 error!\n"));\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Status = PeiServicesGetBootMode (&BootMode);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // In S3 path, skip shadow logic. no measurement is required\r
  //\r
  if (BootMode != BOOT_ON_S3_RESUME) {\r
    Status = (**PeiServices).RegisterForShadow(FileHandle);\r
    if (Status == EFI_ALREADY_STARTED) {\r
      mImageInMemory = TRUE;\r
      mFileHandle = FileHandle;\r
    } else if (Status == EFI_NOT_FOUND) {\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
  }\r
\r
  if (!mImageInMemory) {\r
    //\r
    // Initialize TPM device\r
    //\r
    Status = Tpm2RequestUseTpm ();\r
    if (EFI_ERROR (Status)) {\r
      DEBUG ((DEBUG_ERROR, "TPM2 not detected!\n"));\r
      goto Done;\r
    }\r
\r
    S3ErrorReport = FALSE;\r
    if (PcdGet8 (PcdTpm2InitializationPolicy) == 1) {\r
      if (BootMode == BOOT_ON_S3_RESUME) {\r
        Status = Tpm2Startup (TPM_SU_STATE);\r
        if (EFI_ERROR (Status) ) {\r
          Status = Tpm2Startup (TPM_SU_CLEAR);\r
          if (!EFI_ERROR(Status)) {\r
            S3ErrorReport = TRUE;\r
          }\r
        }\r
      } else {\r
        Status = Tpm2Startup (TPM_SU_CLEAR);\r
      }\r
      if (EFI_ERROR (Status) ) {\r
        goto Done;\r
      }\r
    }\r
\r
    //\r
    // Update Tpm2HashMask according to PCR bank.\r
    //\r
    SyncPcrAllocationsAndPcrMask ();\r
\r
    if (S3ErrorReport) {\r
      //\r
      // The system firmware that resumes from S3 MUST deal with a\r
      // TPM2_Startup error appropriately.\r
      // For example, issue a TPM2_Startup(TPM_SU_CLEAR) command and\r
      // configuring the device securely by taking actions like extending a\r
      // separator with an error digest (0x01) into PCRs 0 through 7.\r
      //\r
      for (PcrIndex = 0; PcrIndex < 8; PcrIndex++) {\r
        Status = MeasureSeparatorEventWithError (PcrIndex);\r
        if (EFI_ERROR (Status)) {\r
          DEBUG ((EFI_D_ERROR, "Separator Event with Error not Measured. Error!\n"));\r
        }\r
      }\r
    }\r
\r
    //\r
    // TpmSelfTest is optional on S3 path, skip it to save S3 time\r
    //\r
    if (BootMode != BOOT_ON_S3_RESUME) {\r
      if (PcdGet8 (PcdTpm2SelfTestPolicy) == 1) {\r
        Status = Tpm2SelfTest (NO);\r
        if (EFI_ERROR (Status)) {\r
          goto Done;\r
        }\r
      }\r
    }\r
\r
    //\r
    // Only intall TpmInitializedPpi on success\r
    //\r
    Status = PeiServicesInstallPpi (&mTpmInitializedPpiList);\r
    ASSERT_EFI_ERROR (Status);\r
  }\r
\r
  if (mImageInMemory) {\r
    Status = PeimEntryMP ((EFI_PEI_SERVICES**)PeiServices);\r
    return Status;\r
  }\r
\r
Done:\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_ERROR, "TPM2 error! Build Hob\n"));\r
    BuildGuidHob (&gTpmErrorHobGuid,0);\r
    REPORT_STATUS_CODE (\r
      EFI_ERROR_CODE | EFI_ERROR_MINOR,\r
      (PcdGet32 (PcdStatusCodeSubClassTpmDevice) | EFI_P_EC_INTERFACE_ERROR)\r
      );\r
  }\r
  //\r
  // Always intall TpmInitializationDonePpi no matter success or fail.\r
  // Other driver can know TPM initialization state by TpmInitializedPpi.\r
  //\r
  Status2 = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);\r
  ASSERT_EFI_ERROR (Status2);\r
\r
  return Status;\r
}\r