1. Can you make the macro short?
EDKII_DEVICE_MEASUREMENT_POLICY_REQUIRED ->
EDKII_DEVICE_MEASUREMENT_REQUIRED
EDKII_DEVICE_AUTHENTICATION_POLICY_REQUIRED ->
EDKII_DEVICE_AUTHENTICATION_REQUIRED
2. It looks a bit strange to me that DeviceSecurityPolicy protocol not only
contains API to return the platform policy
for each device but also saves the security state for each device.
"Security state" is not a policy but a state.
I went back to check the design foils @
https://edk2.groups.io/g/devel/files/Designs/2019/1018/EDKII-Device%20Firmware%20Security.pdf
Now I understand the SetDeviceState() is used to give platform a chance to
disable the device in a platform
specific way. Then how about rename the API to NotifyDeviceState?
But I still don't understand why the device state needs to be passed into
the SetDeviceState() by reference.
Do you expect platform to change the device state? I thought making it
read-only to platform is easy to understand.
Looking deep to the code and I guess you expect the
EDKII_DEVICE_SECURITY_STATE_ERROR_UEFI_UNSUPPORTED
is passed to platform and platform can reset this status to 0 to inform
this driver ignore such error.
Can you please add comments to patch 2/6 to explain clearly what
SetDeviceState() needs to do?
3. Can you refine below debug message so that platform developers when they see
these debug messages can easily understand
these debug messages are for device security features? I suggest you
combine them into one line and with "DeviceSecurity"
keyword in the beginning of the message. "one line" is just a
recommendation but "DeviceSecurity" keyword is what I really need.
With that, debug messages are also helpful to platform developers, not just
helpful to feature developers.
DEBUG((DEBUG_INFO, " CapId - 0x%04x\n", DvSecHdr.CapId));
DEBUG((DEBUG_INFO, " CapVersion - 0x%01x\n", DvSecHdr.CapVersion));
DEBUG((DEBUG_INFO, " NextOffset - 0x%03x\n", DvSecHdr.NextOffset));
DEBUG((DEBUG_INFO, " DvSecVendorId - 0x%04x\n", DvSecHdr.DvSecVendorId));
DEBUG((DEBUG_INFO, " DvSecRevision - 0x%01x\n", DvSecHdr.DvSecRevision));
DEBUG((DEBUG_INFO, " DvSecLength - 0x%03x\n", DvSecHdr.DvSecLength));
DEBUG((DEBUG_INFO, " DvSecId - 0x%04x\n", DvSecHdr.DvSecId));
> -----Original Message-----
> From: Yao, Jiewen <jiewen....@intel.com>
> Sent: Thursday, October 31, 2019 8:31 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray...@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaga...@intel.com>; Lou, Yun <yun....@intel.com>
> Subject: [PATCH V2 4/6] IntelSiliconPkg/IntelPciDeviceSecurityDxe: Add
> PciSecurity.
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2303
>
> This driver is to do the PCI device authentication based upon Intel PCIe
> Security Specification.
>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Rangasai V Chaganty <rangasai.v.chaga...@intel.com>
> Cc: Yun Lou <yun....@intel.com>
> Signed-off-by: Jiewen Yao <jiewen....@intel.com>
> Signed-off-by: Yun Lou <yun....@intel.com>
> ---
>
> Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDxe
> /IntelPciDeviceSecurityDxe.c | 701 ++++++++++++++++++++
>
> Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDxe
> /IntelPciDeviceSecurityDxe.inf | 45 ++
>
> Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDxe
> /TcgDeviceEvent.h | 193 ++++++
> 3 files changed, 939 insertions(+)
>
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDx
> e/IntelPciDeviceSecurityDxe.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityD
> xe/IntelPciDeviceSecurityDxe.c
> new file mode 100644
> index 0000000000..f1859c2715
> --- /dev/null
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceS
> +++ ecurityDxe/IntelPciDeviceSecurityDxe.c
> @@ -0,0 +1,701 @@
> +/** @file
> + EDKII Device Security library for PCI device.
> + It follows the Intel PCIe Security Specification.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Uefi.h>
> +#include <IndustryStandard/Spdm.h>
> +#include <IndustryStandard/IntelPciSecurity.h>
> +#include <IndustryStandard/Pci.h>
> +#include <IndustryStandard/Tpm20.h>
> +#include <IndustryStandard/UefiTcgPlatform.h>
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Library/MemoryAllocationLib.h> #include
> +<Library/TpmMeasurementLib.h> #include <Protocol/PciIo.h> #include
> +<Protocol/DeviceSecurity.h> #include
> +<Protocol/PlatformDeviceSecurityPolicy.h>
> +#include "TcgDeviceEvent.h"
> +
> +typedef struct {
> + UINT8
> Measurement[SHA512_DIGEST_SIZE];
> +} EDKII_DEVICE_SECURITY_EVENT_MEASUREMENT_CONTENT_MAX_HASH;
> +
> +typedef struct {
> + UINTN Signature;
> + LIST_ENTRY Link;
> + UINTN PciSegment;
> + UINTN PciBus;
> + UINTN PciDevice;
> + UINTN PciFunction;
> +} PCI_DEVICE_INSTANCE;
> +
> +#define PCI_DEVICE_INSTANCE_SIGNATURE SIGNATURE_32 ('P', 'D', 'I',
> +'S') #define PCI_DEVICE_INSTANCE_FROM_LINK(a) CR (a,
> +PCI_DEVICE_INSTANCE, Link, PCI_DEVICE_INSTANCE_SIGNATURE)
> +
> +LIST_ENTRY mSecurityEventMeasurementDeviceList =
> +INITIALIZE_LIST_HEAD_VARIABLE(mSecurityEventMeasurementDeviceList)
> ;;
> +EDKII_DEVICE_SECURITY_POLICY_PROTOCOL *mDeviceSecurityPolicy;
> +
> +/**
> + Record a PCI device into device list.
> +
> + @param PciIo PciIo instance of the device
> + @param PciDeviceList The list to record the the device
> +**/
> +VOID
> +RecordPciDeviceInList(
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN LIST_ENTRY *PciDeviceList
> + )
> +{
> + UINTN PciSegment;
> + UINTN PciBus;
> + UINTN PciDevice;
> + UINTN PciFunction;
> + EFI_STATUS Status;
> + PCI_DEVICE_INSTANCE *NewPciDevice;
> +
> + Status = PciIo->GetLocation (PciIo, &PciSegment, &PciBus, &PciDevice,
> + &PciFunction); ASSERT_EFI_ERROR(Status);
> +
> + NewPciDevice = AllocateZeroPool(sizeof(*NewPciDevice));
> + ASSERT_EFI_ERROR(NewPciDevice != NULL);
> +
> + NewPciDevice->Signature = PCI_DEVICE_INSTANCE_SIGNATURE;
> + NewPciDevice->PciSegment = PciSegment;
> + NewPciDevice->PciBus = PciBus;
> + NewPciDevice->PciDevice = PciDevice;
> + NewPciDevice->PciFunction = PciFunction;
> +
> + InsertTailList(PciDeviceList, &NewPciDevice->Link); }
> +
> +/**
> + Check if a PCI device is recorded in device list.
> +
> + @param PciIo PciIo instance of the device
> + @param PciDeviceList The list to record the the device
> +
> + @retval TRUE The PCI device is in the list.
> + @retval FALSE The PCI device is NOT in the list.
> +**/
> +BOOLEAN
> +IsPciDeviceInList(
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN LIST_ENTRY *PciDeviceList
> + )
> +{
> + UINTN PciSegment;
> + UINTN PciBus;
> + UINTN PciDevice;
> + UINTN PciFunction;
> + EFI_STATUS Status;
> + LIST_ENTRY *Link;
> + PCI_DEVICE_INSTANCE *CurrentPciDevice;
> +
> + Status = PciIo->GetLocation (PciIo, &PciSegment, &PciBus, &PciDevice,
> + &PciFunction); ASSERT_EFI_ERROR(Status);
> +
> + Link = GetFirstNode(PciDeviceList);
> + while (!IsNull(PciDeviceList, Link)) {
> + CurrentPciDevice = PCI_DEVICE_INSTANCE_FROM_LINK(Link);
> +
> + if (CurrentPciDevice->PciSegment == PciSegment && CurrentPciDevice-
> >PciBus == PciBus &&
> + CurrentPciDevice->PciDevice == PciDevice && CurrentPciDevice-
> >PciFunction == PciFunction) {
> + DEBUG((DEBUG_INFO, "PCI device duplicated (Loc -
> %04x:%02x:%02x:%02x)\n", PciSegment, PciBus, PciDevice, PciFunction));
> + return TRUE;
> + }
> +
> + Link = GetNextNode(PciDeviceList, Link); }
> +
> + return FALSE;
> +}
> +
> +/*
> + return Offset of the PCI Cap ID.
> +
> + @param PciIo PciIo instance of the device
> + @param CapId The Capability ID of the Pci device
> +
> + @return The PCI Capability ID Offset
> +*/
> +UINT32
> +GetPciCapId (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN UINT8 CapId
> + )
> +{
> + EFI_PCI_CAPABILITY_HDR PciCapIdHdr;
> + UINT32 PciCapIdOffset;
> + EFI_STATUS Status;
> +
> + PciCapIdHdr.CapabilityID = ~CapId;
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint8,
> + PCI_CAPBILITY_POINTER_OFFSET, 1, &PciCapIdHdr.NextItemPtr);
> + ASSERT_EFI_ERROR(Status); if (PciCapIdHdr.NextItemPtr == 0 ||
> PciCapIdHdr.NextItemPtr == 0xFF) {
> + return 0;
> + }
> + PciCapIdOffset = 0;
> + do {
> + if (PciCapIdHdr.CapabilityID == CapId) {
> + break;
> + }
> + PciCapIdOffset = PciCapIdHdr.NextItemPtr;
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint16, PciCapIdOffset, 1,
> &PciCapIdHdr);
> + ASSERT_EFI_ERROR(Status);
> + } while (PciCapIdHdr.NextItemPtr != 0 && PciCapIdHdr.NextItemPtr !=
> + 0xFF);
> +
> + if (PciCapIdHdr.CapabilityID == CapId) {
> + return PciCapIdOffset;
> + } else {
> + return 0;
> + }
> +}
> +
> +/*
> + return Offset of the PCIe Ext Cap ID.
> +
> + @param PciIo PciIo instance of the device
> + @param CapId The Ext Capability ID of the Pci device
> +
> + @return The PCIe Ext Capability ID Offset */
> +UINT32
> +GetPciExpressExtCapId (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN UINT16 CapId
> + )
> +{
> + UINT32 PcieCapIdOffset;
> + PCI_EXPRESS_EXTENDED_CAPABILITIES_HEADER PciExpressExtCapIdHdr;
> + EFI_STATUS Status;
> +
> + PcieCapIdOffset = GetPciCapId (PciIo, EFI_PCI_CAPABILITY_ID_PCIEXP);
> + if (PcieCapIdOffset == 0) {
> + return 0;
> + }
> +
> + PciExpressExtCapIdHdr.CapabilityId = ~CapId;
> + PciExpressExtCapIdHdr.CapabilityVersion = 0xF;
> + PciExpressExtCapIdHdr.NextCapabilityOffset = 0x100; PcieCapIdOffset =
> + 0; do {
> + if (PciExpressExtCapIdHdr.CapabilityId == CapId) {
> + break;
> + }
> + PcieCapIdOffset = PciExpressExtCapIdHdr.NextCapabilityOffset;
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, PcieCapIdOffset, 1,
> &PciExpressExtCapIdHdr);
> + ASSERT_EFI_ERROR(Status);
> + } while (PciExpressExtCapIdHdr.NextCapabilityOffset != 0 &&
> + PciExpressExtCapIdHdr.NextCapabilityOffset != 0xFFF);
> +
> + if (PciExpressExtCapIdHdr.CapabilityId == CapId) {
> + return PcieCapIdOffset;
> + } else {
> + return 0;
> + }
> +}
> +
> +/**
> + Read byte of the PCI device configuration space.
> +
> + @param PciIo PciIo instance of the device
> + @param Offset The offset of the Pci device configuration space
> +
> + @return Byte value of the PCI device configuration space.
> +**/
> +UINT8
> +DvSecPciRead8 (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN UINT32 Offset
> + )
> +{
> + EFI_STATUS Status;
> + UINT8 Data;
> +
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint8, Offset, 1,
> + &Data); ASSERT_EFI_ERROR(Status);
> +
> + return Data;
> +}
> +
> +/**
> + Write byte of the PCI device configuration space.
> +
> + @param PciIo PciIo instance of the device
> + @param Offset The offset of the Pci device configuration space
> + @param Data Byte value of the PCI device configuration space.
> +**/
> +VOID
> +DvSecPciWrite8 (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN UINT32 Offset,
> + IN UINT8 Data
> + )
> +{
> + EFI_STATUS Status;
> +
> + Status = PciIo->Pci.Write (PciIo, EfiPciIoWidthUint8, Offset, 1,
> +&Data);
> + ASSERT_EFI_ERROR(Status);
> +}
> +
> +/**
> + Get the Digest size from the TCG hash Algorithm ID.
> +
> + @param TcgAlgId TCG hash Algorithm ID
> +
> + @return Digest size of the TCG hash Algorithm ID **/ UINTN
> +DigestSizeFromTcgAlgId (
> + IN UINT16 TcgAlgId
> + )
> +{
> + switch (TcgAlgId) {
> + case TPM_ALG_SHA256:
> + return SHA256_DIGEST_SIZE;
> + case TPM_ALG_SHA384:
> + return SHA384_DIGEST_SIZE;
> + case TPM_ALG_SHA512:
> + return SHA512_DIGEST_SIZE;
> + case TPM_ALG_SM3_256:
> + default:
> + break;
> + }
> + return 0;
> +}
> +
> +/**
> + Convert the SPDM hash algo ID from the TCG hash Algorithm ID.
> +
> + @param TcgAlgId TCG hash Algorithm ID
> +
> + @return SPDM hash algo ID
> +**/
> +UINT8
> +TcgAlgIdToSpdmHashAlgo (
> + IN UINT16 TcgAlgId
> + )
> +{
> + switch (TcgAlgId) {
> + case TPM_ALG_SHA256:
> + return SPDM_ALGORITHMS_BASE_HASH_ALGO_TPM_ALG_SHA2_256;
> + case TPM_ALG_SHA384:
> + return SPDM_ALGORITHMS_BASE_HASH_ALGO_TPM_ALG_SHA2_384;
> + case TPM_ALG_SHA512:
> + return SPDM_ALGORITHMS_BASE_HASH_ALGO_TPM_ALG_SHA2_512;
> + case TPM_ALG_SM3_256:
> + default:
> + break;
> + }
> + return 0;
> +}
> +
> +/**
> + This function extend the PCI digest from the DvSec register.
> +
> + @param[in] PciIo The PciIo of the device.
> + @param[in] DeviceSecurityPolicy The Device Security Policy associated
> with the device.
> + @param[in] TcgAlgId TCG hash Algorithm ID
> + @param[in] DigestSel The digest selector
> + @param[in] Digest The digest buffer
> + @param[out] DeviceSecurityState The Device Security state associated
> with the device.
> +**/
> +VOID
> +ExtendDigestRegister (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN EDKII_DEVICE_SECURITY_POLICY *DeviceSecurityPolicy,
> + IN UINT16 TcgAlgId,
> + IN UINT8 DigestSel,
> + IN UINT8 *Digest,
> + OUT EDKII_DEVICE_SECURITY_STATE *DeviceSecurityState
> + )
> +{
> + UINT32 PcrIndex;
> + UINT32 EventType;
> + EDKII_DEVICE_SECURITY_PCI_EVENT_DATA EventLog;
> + EDKII_DEVICE_SECURITY_EVENT_MEASUREMENT_CONTENT_MAX_HASH
> HashData;
> + UINT64 HashDataLen;
> + UINTN DigestSize;
> + EFI_STATUS Status;
> + PCI_TYPE00 PciData;
> +
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint8, 0,
> + sizeof(PciData), &PciData); ASSERT_EFI_ERROR(Status);
> +
> + PcrIndex = EDKII_DEVICE_MEASUREMENT_COMPONENT_PCR_INDEX;
> + EventType = EDKII_DEVICE_MEASUREMENT_COMPONENT_EVENT_TYPE;
> +
> + CopyMem (EventLog.EventData.Signature,
> EDKII_DEVICE_SECURITY_EVENT_DATA_SIGNATURE,
> sizeof(EventLog.EventData.Signature));
> + EventLog.EventData.Version =
> EDKII_DEVICE_SECURITY_EVENT_DATA_VERSION;
> + EventLog.EventData.Length =
> sizeof(EDKII_DEVICE_SECURITY_PCI_EVENT_DATA);
> + EventLog.EventData.SpdmMeasurementBlock.Index =
> DigestSel;
> + EventLog.EventData.SpdmMeasurementBlock.MeasurementType =
> SPDM_MEASUREMENT_BLOCK_MEASUREMENT_TYPE_MUTABLE_FIRMWA
> RE;
> + EventLog.EventData.SpdmMeasurementBlock.MeasurementSpecification
> = 0xFF;
> + EventLog.EventData.SpdmMeasurementBlock.Reserved = 0;
> + EventLog.EventData.SpdmHashAlgo = TcgAlgIdToSpdmHashAlgo
> (TcgAlgId);
> + EventLog.EventData.DeviceType =
> EDKII_DEVICE_SECURITY_EVENT_DATA_DEVICE_TYPE_PCI;
> + ZeroMem (EventLog.EventData.Reserved,
> sizeof(EventLog.EventData.Reserved));
> + EventLog.PciContext.Version =
> EDKII_DEVICE_SECURITY_EVENT_DATA_PCI_CONTEXT_VERSION;
> + EventLog.PciContext.Length =
> sizeof(EDKII_DEVICE_SECURITY_EVENT_DATA_PCI_CONTEXT);
> + EventLog.PciContext.VendorId = PciData.Hdr.VendorId;
> + EventLog.PciContext.DeviceId = PciData.Hdr.DeviceId;
> + EventLog.PciContext.RevisionID = PciData.Hdr.RevisionID;
> + EventLog.PciContext.ClassCode[0] = PciData.Hdr.ClassCode[0];
> + EventLog.PciContext.ClassCode[1] = PciData.Hdr.ClassCode[1];
> + EventLog.PciContext.ClassCode[2] = PciData.Hdr.ClassCode[2];
> + if ((PciData.Hdr.HeaderType & HEADER_LAYOUT_CODE) ==
> HEADER_TYPE_DEVICE) {
> + EventLog.PciContext.SubsystemVendorID =
> PciData.Device.SubsystemVendorID;
> + EventLog.PciContext.SubsystemID = PciData.Device.SubsystemID;
> + } else {
> + EventLog.PciContext.SubsystemVendorID = 0;
> + EventLog.PciContext.SubsystemID = 0;
> + }
> +
> + DigestSize = DigestSizeFromTcgAlgId (TcgAlgId); CopyMem
> + (&HashData.Measurement, Digest, DigestSize);
> +
> + HashDataLen = DigestSize;
> + Status = TpmMeasureAndLogData (
> + PcrIndex,
> + EventType,
> + &EventLog,
> + EventLog.EventData.Length,
> + &HashData,
> + HashDataLen
> + );
> + DEBUG((DEBUG_INFO, "TpmMeasureAndLogData - %r\n", Status));
> + if (EFI_ERROR(Status)) {
> + DeviceSecurityState->MeasurementState =
> +EDKII_DEVICE_SECURITY_STATE_ERROR_TCG_EXTEND_TPM_PCR;
> + } else {
> + RecordPciDeviceInList (PciIo,
> +&mSecurityEventMeasurementDeviceList);
> + }
> +}
> +
> +/**
> + This function reads the PCI digest from the DvSec register and extend to
> TPM.
> +
> + @param[in] PciIo The PciIo of the device.
> + @param[in] DvSecOffset The DvSec register offset of the device.
> + @param[in] DeviceSecurityPolicy The Device Security Policy associated
> with the device.
> + @param[out] DeviceSecurityState The Device Security state associated
> with the device.
> +**/
> +VOID
> +DoMeasurementsFromDigestRegister (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN UINT32 DvSecOffset,
> + IN EDKII_DEVICE_SECURITY_POLICY *DeviceSecurityPolicy,
> + OUT EDKII_DEVICE_SECURITY_STATE *DeviceSecurityState
> + )
> +{
> + UINT8 Modified;
> + UINT8 Valid;
> + UINT16 TcgAlgId;
> + UINT8 NumDigest;
> + UINT8 DigestSel;
> + UINT8 Digest[SHA512_DIGEST_SIZE];
> + UINTN DigestSize;
> + EFI_STATUS Status;
> +
> + TcgAlgId = DvSecPciRead8 (
> + PciIo,
> + DvSecOffset + sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> OFFSET_OF(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE, TcgAlgId)
> + );
> + DEBUG((DEBUG_INFO, " TcgAlgId - 0x%04x\n", TcgAlgId));
> + DigestSize = DigestSizeFromTcgAlgId (TcgAlgId); if (DigestSize == 0)
> + {
> + DEBUG((DEBUG_INFO, "Unsupported Algorithm - 0x%04x\n", TcgAlgId));
> + DeviceSecurityState->MeasurementState =
> EDKII_DEVICE_SECURITY_STATE_ERROR_PCI_NO_CAPABILITIES;
> + return ;
> + }
> + DEBUG((DEBUG_INFO, " (DigestSize: 0x%x)\n", DigestSize));
> +
> + DeviceSecurityState->MeasurementState =
> + EDKII_DEVICE_SECURITY_STATE_SUCCESS;
> +
> + NumDigest = DvSecPciRead8 (
> + PciIo,
> + DvSecOffset + sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> OFFSET_OF(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE, FirmwareID)
> + );
> + DEBUG((DEBUG_INFO, " NumDigest - 0x%02x\n", NumDigest));
> +
> + Valid = DvSecPciRead8 (
> + PciIo,
> + DvSecOffset + sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> OFFSET_OF(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE, Valid)
> + );
> + DEBUG((DEBUG_INFO, " Valid - 0x%02x\n", Valid));
> +
> + //
> + // Only 2 are supported as maximum.
> + // But hardware may report 3.
> + //
> + if (NumDigest > 2) {
> + NumDigest = 2;
> + }
> +
> + for (DigestSel = 0; DigestSel < NumDigest; DigestSel++) {
> + DEBUG((DEBUG_INFO, " DigestSel - 0x%02x\n", DigestSel));
> + if ((DigestSel == 0) && ((Valid & INTEL_PCI_DIGEST_0_VALID) == 0)) {
> + continue;
> + }
> + if ((DigestSel == 1) && ((Valid & INTEL_PCI_DIGEST_1_VALID) == 0)) {
> + continue;
> + }
> + while (TRUE) {
> + //
> + // Host MUST clear DIGEST_MODIFIED before read DIGEST.
> + //
> + DvSecPciWrite8 (
> + PciIo,
> + DvSecOffset + sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> OFFSET_OF(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE, Modified),
> + INTEL_PCI_DIGEST_MODIFIED
> + );
> +
> + Status = PciIo->Pci.Read (
> + PciIo,
> + EfiPciIoWidthUint8,
> + (UINT32)(DvSecOffset +
> sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> sizeof(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE) + DigestSize * DigestSel),
> + DigestSize,
> + Digest
> + );
> + ASSERT_EFI_ERROR(Status);
> +
> + //
> + // After read DIGEST, Host MUST consult DIGEST_MODIFIED.
> + //
> + Modified = DvSecPciRead8 (
> + PciIo,
> + DvSecOffset + sizeof(INTEL_PCI_DIGEST_CAPABILITY_HEADER) +
> OFFSET_OF(INTEL_PCI_DIGEST_CAPABILITY_STRUCTURE, Modified)
> + );
> + if ((Modified & INTEL_PCI_DIGEST_MODIFIED) == 0) {
> + break;
> + }
> + }
> +
> + //
> + // Dump Digest
> + //
> + {
> + UINTN Index;
> + DEBUG((DEBUG_INFO, " Digest - "));
> + for (Index = 0; Index < DigestSize; Index++) {
> + DEBUG((DEBUG_INFO, "%02x", *(Digest + Index)));
> + }
> + DEBUG((DEBUG_INFO, "\n"));
> + }
> +
> + DEBUG((DEBUG_INFO, "ExtendDigestRegister...\n",
> ExtendDigestRegister));
> + ExtendDigestRegister (PciIo, DeviceSecurityPolicy, TcgAlgId,
> +DigestSel, Digest, DeviceSecurityState);
> + }
> +}
> +
> +/**
> + The device driver uses this service to measure a PCI device.
> +
> + @param[in] PciIo The PciIo of the device.
> + @param[in] DeviceSecurityPolicy The Device Security Policy associated
> with the device.
> + @param[out] DeviceSecurityState The Device Security state associated
> with the device.
> +**/
> +VOID
> +DoDeviceMeasurement (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN EDKII_DEVICE_SECURITY_POLICY *DeviceSecurityPolicy,
> + OUT EDKII_DEVICE_SECURITY_STATE *DeviceSecurityState
> + )
> +{
> + UINT32 DvSecOffset;
> + INTEL_PCI_DIGEST_CAPABILITY_HEADER DvSecHdr;
> + EFI_STATUS Status;
> +
> + if (IsPciDeviceInList (PciIo, &mSecurityEventMeasurementDeviceList)) {
> + DeviceSecurityState->MeasurementState =
> EDKII_DEVICE_SECURITY_STATE_SUCCESS;
> + return ;
> + }
> +
> + DvSecOffset = GetPciExpressExtCapId (PciIo, INTEL_PCI_CAPID_DVSEC);
> + DEBUG((DEBUG_INFO, "DvSecOffset - 0x%x\n", DvSecOffset)); if
> + (DvSecOffset == 0) {
> + DeviceSecurityState->MeasurementState =
> EDKII_DEVICE_SECURITY_STATE_ERROR_PCI_NO_CAPABILITIES;
> + return ;
> + }
> + Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint16, DvSecOffset,
> + sizeof(DvSecHdr)/sizeof(UINT16), &DvSecHdr);
> ASSERT_EFI_ERROR(Status);
> + DEBUG((DEBUG_INFO, " CapId - 0x%04x\n", DvSecHdr.CapId));
> + DEBUG((DEBUG_INFO, " CapVersion - 0x%01x\n",
> DvSecHdr.CapVersion));
> + DEBUG((DEBUG_INFO, " NextOffset - 0x%03x\n",
> DvSecHdr.NextOffset));
> + DEBUG((DEBUG_INFO, " DvSecVendorId - 0x%04x\n",
> + DvSecHdr.DvSecVendorId)); DEBUG((DEBUG_INFO, " DvSecRevision -
> 0x%01x\n", DvSecHdr.DvSecRevision));
> + DEBUG((DEBUG_INFO, " DvSecLength - 0x%03x\n",
> DvSecHdr.DvSecLength));
> + DEBUG((DEBUG_INFO, " DvSecId - 0x%04x\n", DvSecHdr.DvSecId));
> + if ((DvSecHdr.DvSecVendorId != INTEL_PCI_DVSEC_VENDORID_INTEL) &&
> + (DvSecHdr.DvSecId != INTEL_PCI_DVSEC_DVSECID_MEASUREMENT)) {
> + DeviceSecurityState->MeasurementState =
> EDKII_DEVICE_SECURITY_STATE_ERROR_PCI_NO_CAPABILITIES;
> + return ;
> + }
> +
> + DoMeasurementsFromDigestRegister (PciIo, DvSecOffset,
> +DeviceSecurityPolicy, DeviceSecurityState); }
> +
> +/**
> + The device driver uses this service to verify a PCI device.
> +
> + @param[in] PciIo The PciIo of the device.
> + @param[in] DeviceSecurityPolicy The Device Security Policy associated
> with the device.
> + @param[out] DeviceSecurityState The Device Security state associated
> with the device.
> +**/
> +VOID
> +DoDeviceAuthentication (
> + IN EFI_PCI_IO_PROTOCOL *PciIo,
> + IN EDKII_DEVICE_SECURITY_POLICY *DeviceSecurityPolicy,
> + OUT EDKII_DEVICE_SECURITY_STATE *DeviceSecurityState
> + )
> +{
> + DeviceSecurityState->AuthenticationState =
> +EDKII_DEVICE_SECURITY_STATE_ERROR_UEFI_UNSUPPORTED;
> +}
> +
> +/**
> + The device driver uses this service to measure and/or verify a device.
> +
> + The flow in device driver is:
> + 1) Device driver discovers a new device.
> + 2) Device driver creates an EFI_DEVICE_PATH_PROTOCOL.
> + 3) Device driver creates a device access protocol. e.g.
> + EFI_PCI_IO_PROTOCOL for PCI device.
> + EFI_USB_IO_PROTOCOL for USB device.
> + EFI_EXT_SCSI_PASS_THRU_PROTOCOL for SCSI device.
> + EFI_ATA_PASS_THRU_PROTOCOL for ATA device.
> + EFI_NVM_EXPRESS_PASS_THRU_PROTOCOL for NVMe device.
> + EFI_SD_MMC_PASS_THRU_PROTOCOL for SD/MMC device.
> + 4) Device driver installs the EFI_DEVICE_PATH_PROTOCOL with
> EFI_DEVICE_PATH_PROTOCOL_GUID,
> + and the device access protocol with
> EDKII_DEVICE_IDENTIFIER_TYPE_xxx_GUID.
> + Once it is done, a DeviceHandle is returned.
> + 5) Device driver creates EDKII_DEVICE_IDENTIFIER with
> EDKII_DEVICE_IDENTIFIER_TYPE_xxx_GUID
> + and the DeviceHandle.
> + 6) Device driver calls DeviceAuthenticate().
> + 7) If DeviceAuthenticate() returns EFI_SECURITY_VIOLATION, the device
> driver uninstalls
> + all protocols on this handle.
> + 8) If DeviceAuthenticate() returns EFI_SUCCESS, the device driver installs
> the device access
> + protocol with a real protocol GUID. e.g.
> + EFI_PCI_IO_PROTOCOL with EFI_PCI_IO_PROTOCOL_GUID.
> + EFI_USB_IO_PROTOCOL with EFI_USB_IO_PROTOCOL_GUID.
> +
> + @param[in] This The protocol instance pointer.
> + @param[in] DeviceId The Identifier for the device.
> +
> + @retval EFI_SUCCESS The device specified by the DeviceId
> passed
> the measurement
> + and/or authentication based upon the
> platform policy.
> + If TCG measurement is required, the
> measurement is
> extended to TPM PCR.
> + @retval EFI_SECURITY_VIOLATION The device fails to return the
> measurement data.
> + @retval EFI_SECURITY_VIOLATION The device fails to response the
> authentication request.
> + @retval EFI_SECURITY_VIOLATION The system fails to verify the device
> based upon the authentication response.
> + @retval EFI_SECURITY_VIOLATION The system fails to extend the
> measurement to TPM PCR.
> +**/
> +EFI_STATUS
> +EFIAPI
> +DeviceAuthentication (
> + IN EDKII_DEVICE_SECURITY_PROTOCOL *This,
> + IN EDKII_DEVICE_IDENTIFIER *DeviceId
> + )
> +{
> + EDKII_DEVICE_SECURITY_POLICY *DeviceSecurityPolicy;
> + EDKII_DEVICE_SECURITY_STATE DeviceSecurityState;
> + EFI_PCI_IO_PROTOCOL *PciIo;
> + EFI_STATUS Status;
> +
> + if (mDeviceSecurityPolicy == NULL) {
> + return EFI_SUCCESS;
> + }
> +
> + if (!CompareGuid (&DeviceId->DeviceType,
> &gEdkiiDeviceIdentifierTypePciGuid)) {
> + return EFI_SUCCESS;
> + }
> +
> + Status = gBS->HandleProtocol (
> + DeviceId->DeviceHandle,
> + &gEdkiiDeviceIdentifierTypePciGuid,
> + (VOID **)&PciIo
> + );
> + if (EFI_ERROR(Status)) {
> + DEBUG ((DEBUG_ERROR, "Locate - DeviceIdentifierTypePci - %r\n",
> Status));
> + return EFI_SUCCESS;
> + }
> +
> + DeviceSecurityState.Version = 0x1;
> + DeviceSecurityState.MeasurementState = 0x0;
> + DeviceSecurityState.AuthenticationState = 0x0;
> +
> + Status = mDeviceSecurityPolicy->GetDevicePolicy
> + (mDeviceSecurityPolicy, DeviceId, &DeviceSecurityPolicy); if
> (EFI_ERROR(Status)) {
> + DEBUG((DEBUG_ERROR, "mDeviceSecurityPolicy->GetDevicePolicy -
> %r\n", Status));
> + DeviceSecurityState.MeasurementState =
> EDKII_DEVICE_SECURITY_STATE_ERROR_UEFI_GET_POLICY_PROTOCOL;
> + DeviceSecurityState.AuthenticationState =
> + EDKII_DEVICE_SECURITY_STATE_ERROR_UEFI_GET_POLICY_PROTOCOL;
> + } else {
> + if ((DeviceSecurityPolicy->MeasurementPolicy &
> EDKII_DEVICE_MEASUREMENT_POLICY_REQUIRED) != 0) {
> + DoDeviceMeasurement (PciIo, DeviceSecurityPolicy,
> &DeviceSecurityState);
> + DEBUG((DEBUG_ERROR, "MeasurementState - 0x%08x\n",
> DeviceSecurityState.MeasurementState));
> + }
> + if ((DeviceSecurityPolicy->AuthenticationPolicy &
> EDKII_DEVICE_AUTHENTICATION_POLICY_REQUIRED) != 0) {
> + DoDeviceAuthentication (PciIo, DeviceSecurityPolicy,
> &DeviceSecurityState);
> + DEBUG((DEBUG_ERROR, "AuthenticationState - 0x%08x\n",
> DeviceSecurityState.AuthenticationState));
> + }
> + }
> +
> + Status = mDeviceSecurityPolicy->SetDeviceState
> + (mDeviceSecurityPolicy, DeviceId, &DeviceSecurityState); if
> (EFI_ERROR(Status)) {
> + DEBUG((DEBUG_ERROR, "mDeviceSecurityPolicy->SetDeviceState - %r\n",
> + Status)); }
> +
> + if ((DeviceSecurityState.MeasurementState == 0) &&
> + (DeviceSecurityState.AuthenticationState == 0)) {
> + return EFI_SUCCESS;
> + } else {
> + return EFI_SECURITY_VIOLATION;
> + }
> +}
> +
> +EDKII_DEVICE_SECURITY_PROTOCOL mDeviceSecurity = {
> + EDKII_DEVICE_SECURITY_PROTOCOL_REVISION,
> + DeviceAuthentication
> +};
> +
> +/**
> + Entrypoint of the device security driver.
> +
> + @param[in] ImageHandle ImageHandle of the loaded driver @param[in]
> + SystemTable Pointer to the System Table
> +
> + @retval EFI_SUCCESS The Protocol is installed.
> + @retval EFI_OUT_OF_RESOURCES Not enough resources available to
> initialize driver.
> + @retval EFI_DEVICE_ERROR A device error occurred attempting to
> initialize the driver.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MainEntryPoint (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + EFI_HANDLE Handle;
> + EFI_STATUS Status;
> +
> + Status = gBS->LocateProtocol
> + (&gEdkiiDeviceSecurityPolicyProtocolGuid, NULL, (VOID
> + **)&mDeviceSecurityPolicy); ASSERT_EFI_ERROR(Status);
> +
> + Handle = NULL;
> + Status = gBS->InstallProtocolInterface (
> + &Handle,
> + &gEdkiiDeviceSecurityProtocolGuid,
> + EFI_NATIVE_INTERFACE,
> + (VOID **)&mDeviceSecurity
> + );
> + ASSERT_EFI_ERROR(Status);
> +
> + return Status;
> +}
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDx
> e/IntelPciDeviceSecurityDxe.inf
> b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityD
> xe/IntelPciDeviceSecurityDxe.inf
> new file mode 100644
> index 0000000000..89a4c8fadd
> --- /dev/null
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceS
> +++ ecurityDxe/IntelPciDeviceSecurityDxe.inf
> @@ -0,0 +1,45 @@
> +## @file
> +# EDKII Device Security library for PCI device # # Copyright (c) 2019,
> +Intel Corporation. All rights reserved.<BR> # SPDX-License-Identifier:
> +BSD-2-Clause-Patent # ##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = IntelPciDeviceSecurityDxe
> + FILE_GUID = D9569195-ED94-47D2-9523-38BF2D201371
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + ENTRY_POINT = MainEntryPoint
> +
> +[Sources]
> + IntelPciDeviceSecurityDxe.c
> + TcgDeviceEvent.h
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> + IntelSiliconPkg/IntelSiliconPkg.dec
> +
> +[LibraryClasses]
> + UefiRuntimeServicesTableLib
> + UefiBootServicesTableLib
> + UefiDriverEntryPoint
> + MemoryAllocationLib
> + DevicePathLib
> + BaseMemoryLib
> + PrintLib
> + DebugLib
> + UefiLib
> + PcdLib
> + TpmMeasurementLib
> +
> +[Protocols]
> + gEdkiiDeviceSecurityPolicyProtocolGuid ## CONSUMES
> + gEdkiiDeviceSecurityProtocolGuid ## PRODUCES
> + gEdkiiDeviceIdentifierTypePciGuid ## COMSUMES
> +
> +[Depex]
> + gEdkiiDeviceSecurityPolicyProtocolGuid
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityDx
> e/TcgDeviceEvent.h
> b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceSecurityD
> xe/TcgDeviceEvent.h
> new file mode 100644
> index 0000000000..8b1227dace
> --- /dev/null
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/PcieSecurity/IntelPciDeviceS
> +++ ecurityDxe/TcgDeviceEvent.h
> @@ -0,0 +1,193 @@
> +/** @file
> + TCG Device Event data structure
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent **/
> +
> +
> +#ifndef __TCG_EVENT_DATA_H__
> +#define __TCG_EVENT_DATA_H__
> +
> +#include <IndustryStandard/Spdm.h>
> +
> +#pragma pack(1)
> +
> +// -------------------------------------------
> +// TCG Measurement for SPDM Device Measurement //
> +-------------------------------------------
> +
> +//
> +// Device Firmware Component (including immutable ROM or mutable
> +firmware) //
> +#define EDKII_DEVICE_MEASUREMENT_COMPONENT_PCR_INDEX 2
> +#define EDKII_DEVICE_MEASUREMENT_COMPONENT_EVENT_TYPE
> 0x800000E1
> +//
> +// Device Firmware Configuration (including hardware configuration or
> +firmware configuration) //
> +#define EDKII_DEVICE_MEASUREMENT_CONFIGURATION_PCR_INDEX 4
> +#define EDKII_DEVICE_MEASUREMENT_CONFIGURATION_EVENT_TYPE
> 0x800000E2
> +
> +//
> +// Device Firmware Measurement Measurement Data // The measurement
> data
> +is the device firmware measurement.
> +//
> +// TBD: Open:
> +// In order to support crypto agile, the firmware will hash the
> DeviceMeasurement again.
> +// As such the device measurement algo might be different with host
> firmware measurement algo.
> +//
> +
> +//
> +// Device Firmware Measurement Event Data // #define
> +EDKII_DEVICE_SECURITY_EVENT_DATA_SIGNATURE "SPDM Device Sec\0"
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_VERSION 0
> +
> +//
> +// Device Type
> +// 0x03 ~ 0xDF reserved by TCG.
> +// 0xE0 ~ 0xFF reserved by OEM.
> +//
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_DEVICE_TYPE_NULL 0
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_DEVICE_TYPE_PCI 1
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_DEVICE_TYPE_USB 2
> +
> +//
> +// Device Firmware Measurement Event Data Common Part // The device
> +specific part should follow this data structure.
> +//
> +typedef struct {
> + //
> + // It must be EDKII_DEVICE_SECURITY_EVENT_DATA_SIGNATURE.
> + //
> + UINT8 Signature[16];
> + //
> + // It must be EDKII_DEVICE_SECURITY_EVENT_DATA_VERSION.
> + //
> + UINT16 Version;
> + //
> + // The length of whole data structure, including Device Context.
> + //
> + UINT16 Length;
> + //
> + // The SPDM measurement block header.
> + //
> + SPDM_MEASUREMENT_BLOCK_HEADER SpdmMeasurementBlock;
> + //
> + // The SpdmHashAlgo
> + //
> + UINT8 SpdmHashAlgo;
> + //
> + // The type of device. This field is to determine the Device Context
> followed by.
> + //
> + UINT8 DeviceType;
> + //
> + // reserved. Make UINT64 aligned.
> + //
> + UINT8 Reserved[6];
> +} EDKII_DEVICE_SECURITY_EVENT_DATA_HEADER;
> +
> +//
> +// PCI device specific context
> +//
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_PCI_CONTEXT_VERSION 0
> typedef
> +struct {
> + UINT16 Version;
> + UINT16 Length;
> + UINT16 VendorId;
> + UINT16 DeviceId;
> + UINT8 RevisionID;
> + UINT8 ClassCode[3];
> + UINT16 SubsystemVendorID;
> + UINT16 SubsystemID;
> +} EDKII_DEVICE_SECURITY_EVENT_DATA_PCI_CONTEXT;
> +
> +typedef struct {
> + EDKII_DEVICE_SECURITY_EVENT_DATA_HEADER EventData;
> + EDKII_DEVICE_SECURITY_EVENT_DATA_PCI_CONTEXT PciContext; }
> +EDKII_DEVICE_SECURITY_PCI_EVENT_DATA;
> +
> +//
> +// USB device specific context
> +//
> +#define EDKII_DEVICE_SECURITY_EVENT_DATA_USB_CONTEXT_VERSION
> 0 typedef
> +struct {
> + UINT16 Version;
> + UINT16 Length;
> +//UINT8 DeviceDescriptor[DescLen];
> +//UINT8 BodDescriptor[DescLen];
> +//UINT8 ConfigurationDescriptor[DescLen][NumOfConfiguration];
> +} EDKII_DEVICE_SECURITY_EVENT_DATA_USB_CONTEXT;
> +
> +typedef struct {
> + EDKII_DEVICE_SECURITY_EVENT_DATA_HEADER EventData;
> + EDKII_DEVICE_SECURITY_EVENT_DATA_USB_CONTEXT PciContext; }
> +EDKII_DEVICE_SECURITY_USB_EVENT_DATA;
> +
> +// ----------------------------------------------
> +// TCG Measurement for SPDM Device Authentication //
> +----------------------------------------------
> +
> +//
> +// Device Root cert is stored into a UEFI authenticated variable.
> +// It is non-volatile, boot service, runtime service, and time based
> authenticated variable.
> +// The "devdb" includes a list of allowed device root cert.
> +// The "devdbx" includes a list of forbidden device root cert.
> +// The usage of "devdb" and "devdbx" is same as "db" and "dbx" in UEFI
> secure boot.
> +//
> +// NOTE: We choose not to mix "db"/"dbx" for better management
> purpose.
> +//
> +
> +#define EDKII_DEVICE_ROOT_CERT_VARAIBLE_NAME L"devdb"
> +#define EDKII_DEVICE_ROOT_CERT_VARAIBLE2_NAME L"devdbx"
> +
> +#define EDKII_DEVICE_SIGNATURE_DATABASE_GUID \
> + {0xb9c2b4f4, 0xbf5f, 0x462d, 0x8a, 0xdf, 0xc5, 0xc7, 0xa, 0xc3, 0x5d,
> +0xad}
> +
> +//
> +// Platform Firmware adhering to the policy MUST therefore measure the
> following values into PCR[7]:
> +// 1. The content of the
> EDKII_DEVICE_SIGNATURE_DATABASE_GUID/EDKII_DEVICE_ROOT_CERT_V
> ARAIBLE_NAME variable.
> +// 2. The content of the
> EDKII_DEVICE_SIGNATURE_DATABASE_GUID/EDKII_DEVICE_ROOT_CERT_V
> ARAIBLE2_NAME variable.
> +// 3. Entries in the
> EDKII_DEVICE_SIGNATURE_DATABASE_GUID/EDKII_DEVICE_ROOT_CERT_V
> ARAIBLE_NAME variable to
> +// authenticate the device.
> +//
> +// For all UEFI variable value events, the eventType SHALL be
> +EV_EFI_VARIABLE_DRIVER_CONFIG and the Event // value SHALL be the
> value of the UEFI_VARIABLE_DATA structure (this structure SHALL be
> considered byte-aligned).
> +// The measurement digest MUST be tagged Hash for each supported PCR
> +bank of the event data which is the // UEFI_VARIABLE_DATA structure.
> +The UEFI_VARIABLE_DATA.UnicodeNameLength value is the number of
> CHAR16 // characters (not the number of bytes). The
> UEFI_VARIABLE_DATA.UnicodeName contents MUST NOT include a NUL.
> +// If reading a UEFI variable returns UEFI_NOT_FOUND, the
> +UEFI_VARIABLE_DATA.VariableDataLength field MUST // be set to zero and
> UEFI_VARIABLE_DATA.VariableData field will have a size of zero.
> +//
> +
> +//
> +// Entities that MUST be measured if the TPM is enabled:
> +// 1. Before executing any code not cryptographically authenticated as
> being provided by the Platform Manufacturer,
> +// the Platform Manufacturer firmware MUST measure the following
> values, in the order listed using the
> +// EV_EFI_VARIABLE_DRIVER_CONFIG event type to PCR[7]:
> +// a) The content of the EDKII_DEVICE_SIGNATURE_DATABASE_GUID/
> EDKII_DEVICE_ROOT_CERT_VARAIBLE_NAME variable.
> +// b) The content of the EDKII_DEVICE_SIGNATURE_DATABASE_GUID/
> EDKII_DEVICE_ROOT_CERT_VARAIBLE2_NAME variable.
> +// 2. If the platform supports changing any of the following UEFI policy
> variables after they are initially measured
> +// in PCR[7] and before ExitBootServices() has completed, the platform
> MAY be restarted OR the variables MUST be
> +// remeasured into PCR[7]. Additionally the normal update process for
> setting any of the UEFI variables below SHOULD
> +// occur before the initial measurement in PCR[7] or after the call to
> ExitBootServices() has completed.
> +// a) The content of the EDKII_DEVICE_SIGNATURE_DATABASE_GUID/
> EDKII_DEVICE_ROOT_CERT_VARAIBLE_NAME variable.
> +// b) The content of the EDKII_DEVICE_SIGNATURE_DATABASE_GUID/
> EDKII_DEVICE_ROOT_CERT_VARAIBLE2_NAME variable.
> +// 3. The system SHALL measure the EV_SEPARATOR event in PCR[7]. (This
> occurs at the same time the separator is
> +// measured to PCR[0-7].)
> +// Before setting up a device, the UEFI firmware SHALL determine if the
> entry in the
> +// EDKII_DEVICE_SIGNATURE_DATABASE_GUID/
> EDKII_DEVICE_ROOT_CERT_VARAIBLE_NAME variable that was used to
> validate
> +// the device has previously been measured in PCR[7]. If it has not been,
> it
> MUST be measured into PCR[7] as follows.
> +// If it has been measured previously, it MUST NOT be measured again.
> The measurement SHALL occur in conjunction
> +// with device setup.
> +// a) The eventType SHALL be EV_EFI_VARIABLE_AUTHORITY.
> +// b) The event value SHALL be the value of the UEFI_VARIABLE_DATA
> structure.
> +// i. The UEFI_VARIABLE_DATA.VariableData value SHALL be the
> UEFI_SIGNATURE_DATA value from the
> +// UEFI_SIGNATURE_LIST that contained the authority that was used
> to validate the image.
> +// ii. The UEFI_VARIABLE_DATA.VariableName SHALL be set to
> UEFI_IMAGE_SECURITY_DATABASE_GUID.
> +// iii. The UEFI_VARIABLE_DATA.UnicodeName SHALL be set to the value
> of UEFI_IMAGE_SECURITY_DATABASE.
> +// The value MUST NOT include the terminating NUL.
> +//
> +
> +#pragma pack()
> +
> +#endif
> --
> 2.19.2.windows.1
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