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audk/SecurityPkg/Tcg/TcgDxe/TcgDxe.c

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/** @file
This module implements TCG EFI Protocol.
Copyright (c) 2005 - 2011, 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 <IndustryStandard/Tpm12.h>
#include <IndustryStandard/Acpi.h>
#include <IndustryStandard/PeImage.h>
#include <IndustryStandard/SmBios.h>
#include <Guid/GlobalVariable.h>
#include <Guid/SmBios.h>
#include <Guid/HobList.h>
#include <Guid/TcgEventHob.h>
#include <Guid/EventGroup.h>
#include <Protocol/DevicePath.h>
#include <Protocol/TcgService.h>
#include <Protocol/AcpiTable.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/HobLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PrintLib.h>
#include <Library/TpmCommLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiLib.h>
#include "TpmComm.h"
#define EFI_TCG_LOG_AREA_SIZE 0x10000
#pragma pack (1)
typedef struct _EFI_TCG_CLIENT_ACPI_TABLE {
EFI_ACPI_DESCRIPTION_HEADER Header;
UINT16 PlatformClass;
UINT32 Laml;
EFI_PHYSICAL_ADDRESS Lasa;
} EFI_TCG_CLIENT_ACPI_TABLE;
typedef struct _EFI_TCG_SERVER_ACPI_TABLE {
EFI_ACPI_DESCRIPTION_HEADER Header;
UINT16 PlatformClass;
UINT16 Reserved0;
UINT64 Laml;
EFI_PHYSICAL_ADDRESS Lasa;
UINT16 SpecRev;
UINT8 DeviceFlags;
UINT8 InterruptFlags;
UINT8 Gpe;
UINT8 Reserved1[3];
UINT32 GlobalSysInt;
EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE BaseAddress;
UINT32 Reserved2;
EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE ConfigAddress;
UINT8 PciSegNum;
UINT8 PciBusNum;
UINT8 PciDevNum;
UINT8 PciFuncNum;
} EFI_TCG_SERVER_ACPI_TABLE;
#pragma pack ()
#define TCG_DXE_DATA_FROM_THIS(this) \
BASE_CR (this, TCG_DXE_DATA, TcgProtocol)
typedef struct _TCG_DXE_DATA {
EFI_TCG_PROTOCOL TcgProtocol;
TCG_EFI_BOOT_SERVICE_CAPABILITY BsCap;
EFI_TCG_CLIENT_ACPI_TABLE *TcgClientAcpiTable;
EFI_TCG_SERVER_ACPI_TABLE *TcgServerAcpiTable;
UINTN EventLogSize;
UINT8 *LastEvent;
TIS_TPM_HANDLE TpmHandle;
} TCG_DXE_DATA;
EFI_TCG_CLIENT_ACPI_TABLE mTcgClientAcpiTemplate = {
{
EFI_ACPI_3_0_TRUSTED_COMPUTING_PLATFORM_ALLIANCE_CAPABILITIES_TABLE_SIGNATURE,
sizeof (mTcgClientAcpiTemplate),
0x02 //Revision
//
// Compiler initializes the remaining bytes to 0
// These fields should be filled in in production
//
},
0, // 0 for PC Client Platform Class
0, // Log Area Max Length
(EFI_PHYSICAL_ADDRESS) (SIZE_4GB - 1) // Log Area Start Address
};
//
// The following EFI_TCG_SERVER_ACPI_TABLE default setting is just one example,
// the TPM device connectes to LPC, and also defined the ACPI _UID as 0xFF,
// this _UID can be changed and should match with the _UID setting of the TPM
// ACPI device object
//
EFI_TCG_SERVER_ACPI_TABLE mTcgServerAcpiTemplate = {
{
EFI_ACPI_3_0_TRUSTED_COMPUTING_PLATFORM_ALLIANCE_CAPABILITIES_TABLE_SIGNATURE,
sizeof (mTcgServerAcpiTemplate),
0x02 //Revision
//
// Compiler initializes the remaining bytes to 0
// These fields should be filled in in production
//
},
1, // 1 for Server Platform Class
0, // Reserved
0, // Log Area Max Length
(EFI_PHYSICAL_ADDRESS) (SIZE_4GB - 1), // Log Area Start Address
0x0100, // TCG Specification revision 1.0
2, // Device Flags
0, // Interrupt Flags
0, // GPE
{0}, // Reserved 3 bytes
0, // Global System Interrupt
{
EFI_ACPI_3_0_SYSTEM_MEMORY,
0,
0,
EFI_ACPI_3_0_BYTE,
TPM_BASE_ADDRESS // Base Address
},
0, // Reserved
{0}, // Configuration Address
0xFF, // ACPI _UID value of the device, can be changed for different platforms
0, // ACPI _UID value of the device, can be changed for different platforms
0, // ACPI _UID value of the device, can be changed for different platforms
0 // ACPI _UID value of the device, can be changed for different platforms
};
UINTN mBootAttempts = 0;
CHAR16 mBootVarName[] = L"BootOrder";
/**
This service provides EFI protocol capability information, state information
about the TPM, and Event Log state information.
@param[in] This Indicates the calling context
@param[out] ProtocolCapability The callee allocates memory for a TCG_BOOT_SERVICE_CAPABILITY
structure and fills in the fields with the EFI protocol
capability information and the current TPM state information.
@param[out] TCGFeatureFlags This is a pointer to the feature flags. No feature
flags are currently defined so this parameter
MUST be set to 0. However, in the future,
feature flags may be defined that, for example,
enable hash algorithm agility.
@param[out] EventLogLocation This is a pointer to the address of the event log in memory.
@param[out] EventLogLastEntry If the Event Log contains more than one entry,
this is a pointer to the address of the start of
the last entry in the event log in memory.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_INVALID_PARAMETER ProtocolCapability does not match TCG capability.
**/
EFI_STATUS
EFIAPI
TcgDxeStatusCheck (
IN EFI_TCG_PROTOCOL *This,
OUT TCG_EFI_BOOT_SERVICE_CAPABILITY *ProtocolCapability,
OUT UINT32 *TCGFeatureFlags,
OUT EFI_PHYSICAL_ADDRESS *EventLogLocation,
OUT EFI_PHYSICAL_ADDRESS *EventLogLastEntry
)
{
TCG_DXE_DATA *TcgData;
TcgData = TCG_DXE_DATA_FROM_THIS (This);
if (ProtocolCapability != NULL) {
*ProtocolCapability = TcgData->BsCap;
}
if (TCGFeatureFlags != NULL) {
*TCGFeatureFlags = 0;
}
if (EventLogLocation != NULL) {
if (PcdGet8 (PcdTpmPlatformClass) == TCG_PLATFORM_TYPE_CLIENT) {
*EventLogLocation = TcgData->TcgClientAcpiTable->Lasa;
} else {
*EventLogLocation = TcgData->TcgServerAcpiTable->Lasa;
}
}
if (EventLogLastEntry != NULL) {
if (TcgData->BsCap.TPMDeactivatedFlag) {
*EventLogLastEntry = (EFI_PHYSICAL_ADDRESS)(UINTN)0;
} else {
*EventLogLastEntry = (EFI_PHYSICAL_ADDRESS)(UINTN)TcgData->LastEvent;
}
}
return EFI_SUCCESS;
}
/**
This service abstracts the capability to do a hash operation on a data buffer.
@param[in] This Indicates the calling context
@param[in] HashData Pointer to the data buffer to be hashed
@param[in] HashDataLen Length of the data buffer to be hashed
@param[in] AlgorithmId Identification of the Algorithm to use for the hashing operation
@param[in, out] HashedDataLen Resultant length of the hashed data
@param[in, out] HashedDataResult Resultant buffer of the hashed data
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_INVALID_PARAMETER HashDataLen is NULL.
@retval EFI_INVALID_PARAMETER HashDataLenResult is NULL.
@retval EFI_OUT_OF_RESOURCES Cannot allocate buffer of size *HashedDataLen.
@retval EFI_UNSUPPORTED AlgorithmId not supported.
@retval EFI_BUFFER_TOO_SMALL *HashedDataLen < sizeof (TCG_DIGEST).
**/
EFI_STATUS
EFIAPI
TcgDxeHashAll (
IN EFI_TCG_PROTOCOL *This,
IN UINT8 *HashData,
IN UINT64 HashDataLen,
IN TCG_ALGORITHM_ID AlgorithmId,
IN OUT UINT64 *HashedDataLen,
IN OUT UINT8 **HashedDataResult
)
{
if (HashedDataLen == NULL || HashedDataResult == NULL) {
return EFI_INVALID_PARAMETER;
}
switch (AlgorithmId) {
case TPM_ALG_SHA:
if (*HashedDataLen == 0) {
*HashedDataLen = sizeof (TPM_DIGEST);
*HashedDataResult = AllocatePool ((UINTN) *HashedDataLen);
if (*HashedDataResult == NULL) {
return EFI_OUT_OF_RESOURCES;
}
}
if (*HashedDataLen < sizeof (TPM_DIGEST)) {
*HashedDataLen = sizeof (TPM_DIGEST);
return EFI_BUFFER_TOO_SMALL;
}
*HashedDataLen = sizeof (TPM_DIGEST);
return TpmCommHashAll (
HashData,
(UINTN) HashDataLen,
(TPM_DIGEST*)*HashedDataResult
);
default:
return EFI_UNSUPPORTED;
}
}
/**
Add a new entry to the Event Log.
@param[in] TcgData TCG_DXE_DATA structure.
@param[in] NewEventHdr Pointer to a TCG_PCR_EVENT_HDR data structure.
@param[in] NewEventData Pointer to the new event data.
@retval EFI_SUCCESS The new event log entry was added.
@retval EFI_OUT_OF_RESOURCES No enough memory to log the new event.
**/
EFI_STATUS
EFIAPI
TcgDxeLogEventI (
IN TCG_DXE_DATA *TcgData,
IN TCG_PCR_EVENT_HDR *NewEventHdr,
IN UINT8 *NewEventData
)
{
if (PcdGet8 (PcdTpmPlatformClass) == TCG_PLATFORM_TYPE_CLIENT) {
TcgData->LastEvent = (UINT8*)(UINTN)TcgData->TcgClientAcpiTable->Lasa;
return TpmCommLogEvent (
&TcgData->LastEvent,
&TcgData->EventLogSize,
(UINTN)TcgData->TcgClientAcpiTable->Laml,
NewEventHdr,
NewEventData
);
} else {
TcgData->LastEvent = (UINT8*)(UINTN)TcgData->TcgServerAcpiTable->Lasa;
return TpmCommLogEvent (
&TcgData->LastEvent,
&TcgData->EventLogSize,
(UINTN)TcgData->TcgServerAcpiTable->Laml,
NewEventHdr,
NewEventData
);
}
}
/**
This service abstracts the capability to add an entry to the Event Log.
@param[in] This Indicates the calling context
@param[in] TCGLogData Pointer to the start of the data buffer containing
the TCG_PCR_EVENT data structure. All fields in
this structure are properly filled by the caller.
@param[in, out] EventNumber The event number of the event just logged
@param[in] Flags Indicate additional flags. Only one flag has been
defined at this time, which is 0x01 and means the
extend operation should not be performed. All
other bits are reserved.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES Insufficient memory in the event log to complete this action.
**/
EFI_STATUS
EFIAPI
TcgDxeLogEvent (
IN EFI_TCG_PROTOCOL *This,
IN TCG_PCR_EVENT *TCGLogData,
IN OUT UINT32 *EventNumber,
IN UINT32 Flags
)
{
TCG_DXE_DATA *TcgData;
TcgData = TCG_DXE_DATA_FROM_THIS (This);
if (TcgData->BsCap.TPMDeactivatedFlag) {
return EFI_DEVICE_ERROR;
}
return TcgDxeLogEventI (
TcgData,
(TCG_PCR_EVENT_HDR*)TCGLogData,
TCGLogData->Event
);
}
/**
This service is a proxy for commands to the TPM.
@param[in] This Indicates the calling context
@param[in] TpmInputParameterBlockSize Size of the TPM input parameter block
@param[in] TpmInputParameterBlock Pointer to the TPM input parameter block
@param[in] TpmOutputParameterBlockSize Size of the TPM output parameter block
@param[in] TpmOutputParameterBlock Pointer to the TPM output parameter block
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_INVALID_PARAMETER Invalid ordinal.
@retval EFI_UNSUPPORTED Current Task Priority Level >= EFI_TPL_CALLBACK.
@retval EFI_TIMEOUT The TIS timed-out.
**/
EFI_STATUS
EFIAPI
TcgDxePassThroughToTpm (
IN EFI_TCG_PROTOCOL *This,
IN UINT32 TpmInputParameterBlockSize,
IN UINT8 *TpmInputParameterBlock,
IN UINT32 TpmOutputParameterBlockSize,
IN UINT8 *TpmOutputParameterBlock
)
{
TCG_DXE_DATA *TcgData;
TcgData = TCG_DXE_DATA_FROM_THIS (This);
return TisPcExecute (
TcgData->TpmHandle,
"%r%/%r",
TpmInputParameterBlock,
(UINTN) TpmInputParameterBlockSize,
TpmOutputParameterBlock,
(UINTN) TpmOutputParameterBlockSize
);
}
/**
Do a hash operation on a data buffer, extend a specific TPM PCR with the hash result,
and add an entry to the Event Log.
@param[in] TcgData TCG_DXE_DATA structure.
@param[in] HashData Physical address of the start of the data buffer
to be hashed, extended, and logged.
@param[in] HashDataLen The length, in bytes, of the buffer referenced by HashData
@param[in, out] NewEventHdr Pointer to a TCG_PCR_EVENT_HDR data structure.
@param[in] NewEventData Pointer to the new event data.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES No enough memory to log the new event.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
EFIAPI
TcgDxeHashLogExtendEventI (
IN TCG_DXE_DATA *TcgData,
IN UINT8 *HashData,
IN UINT64 HashDataLen,
IN OUT TCG_PCR_EVENT_HDR *NewEventHdr,
IN UINT8 *NewEventData
)
{
EFI_STATUS Status;
if (HashDataLen > 0) {
Status = TpmCommHashAll (
HashData,
(UINTN) HashDataLen,
&NewEventHdr->Digest
);
ASSERT_EFI_ERROR (Status);
}
Status = TpmCommExtend (
TcgData->TpmHandle,
&NewEventHdr->Digest,
NewEventHdr->PCRIndex,
NULL
);
if (!EFI_ERROR (Status)) {
Status = TcgDxeLogEventI (TcgData, NewEventHdr, NewEventData);
}
return Status;
}
/**
This service abstracts the capability to do a hash operation on a data buffer,
extend a specific TPM PCR with the hash result, and add an entry to the Event Log
@param[in] This Indicates the calling context
@param[in] HashData Physical address of the start of the data buffer
to be hashed, extended, and logged.
@param[in] HashDataLen The length, in bytes, of the buffer referenced by HashData
@param[in] AlgorithmId Identification of the Algorithm to use for the hashing operation
@param[in, out] TCGLogData The physical address of the start of the data
buffer containing the TCG_PCR_EVENT data structure.
@param[in, out] EventNumber The event number of the event just logged.
@param[out] EventLogLastEntry Physical address of the first byte of the entry
just placed in the Event Log. If the Event Log was
empty when this function was called then this physical
address will be the same as the physical address of
the start of the Event Log.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_UNSUPPORTED AlgorithmId != TPM_ALG_SHA.
@retval EFI_UNSUPPORTED Current TPL >= EFI_TPL_CALLBACK.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
EFIAPI
TcgDxeHashLogExtendEvent (
IN EFI_TCG_PROTOCOL *This,
IN EFI_PHYSICAL_ADDRESS HashData,
IN UINT64 HashDataLen,
IN TPM_ALGORITHM_ID AlgorithmId,
IN OUT TCG_PCR_EVENT *TCGLogData,
IN OUT UINT32 *EventNumber,
OUT EFI_PHYSICAL_ADDRESS *EventLogLastEntry
)
{
TCG_DXE_DATA *TcgData;
TcgData = TCG_DXE_DATA_FROM_THIS (This);
if (TcgData->BsCap.TPMDeactivatedFlag) {
return EFI_DEVICE_ERROR;
}
if (AlgorithmId != TPM_ALG_SHA) {
return EFI_UNSUPPORTED;
}
return TcgDxeHashLogExtendEventI (
TcgData,
(UINT8 *) (UINTN) HashData,
HashDataLen,
(TCG_PCR_EVENT_HDR*)TCGLogData,
TCGLogData->Event
);
}
TCG_DXE_DATA mTcgDxeData = {
{
TcgDxeStatusCheck,
TcgDxeHashAll,
TcgDxeLogEvent,
TcgDxePassThroughToTpm,
TcgDxeHashLogExtendEvent
},
{
sizeof (mTcgDxeData.BsCap),
{ 1, 2, 0, 0 },
{ 1, 2, 0, 0 },
1,
TRUE,
FALSE
},
&mTcgClientAcpiTemplate,
&mTcgServerAcpiTemplate,
0,
NULL,
NULL
};
/**
Initialize the Event Log and log events passed from the PEI phase.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES Out of memory.
**/
EFI_STATUS
EFIAPI
SetupEventLog (
VOID
)
{
EFI_STATUS Status;
TCG_PCR_EVENT *TcgEvent;
EFI_PEI_HOB_POINTERS GuidHob;
EFI_PHYSICAL_ADDRESS Lasa;
if (PcdGet8 (PcdTpmPlatformClass) == TCG_PLATFORM_TYPE_CLIENT) {
Lasa = mTcgClientAcpiTemplate.Lasa;
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiACPIMemoryNVS,
EFI_SIZE_TO_PAGES (EFI_TCG_LOG_AREA_SIZE),
&Lasa
);
if (EFI_ERROR (Status)) {
return Status;
}
mTcgClientAcpiTemplate.Lasa = Lasa;
//
// To initialize them as 0xFF is recommended
// because the OS can know the last entry for that.
//
SetMem ((VOID *)(UINTN)mTcgClientAcpiTemplate.Lasa, EFI_TCG_LOG_AREA_SIZE, 0xFF);
mTcgClientAcpiTemplate.Laml = EFI_TCG_LOG_AREA_SIZE;
} else {
Lasa = mTcgServerAcpiTemplate.Lasa;
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiACPIMemoryNVS,
EFI_SIZE_TO_PAGES (EFI_TCG_LOG_AREA_SIZE),
&Lasa
);
if (EFI_ERROR (Status)) {
return Status;
}
mTcgServerAcpiTemplate.Lasa = Lasa;
//
// To initialize them as 0xFF is recommended
// because the OS can know the last entry for that.
//
SetMem ((VOID *)(UINTN)mTcgServerAcpiTemplate.Lasa, EFI_TCG_LOG_AREA_SIZE, 0xFF);
mTcgServerAcpiTemplate.Laml = EFI_TCG_LOG_AREA_SIZE;
}
GuidHob.Raw = GetHobList ();
while (!EFI_ERROR (Status) &&
(GuidHob.Raw = GetNextGuidHob (&gTcgEventEntryHobGuid, GuidHob.Raw)) != NULL) {
TcgEvent = GET_GUID_HOB_DATA (GuidHob.Guid);
GuidHob.Raw = GET_NEXT_HOB (GuidHob);
Status = TcgDxeLogEventI (
&mTcgDxeData,
(TCG_PCR_EVENT_HDR*)TcgEvent,
TcgEvent->Event
);
}
return Status;
}
/**
Measure and log an action string, and extend the measurement result into PCR[5].
@param[in] String A specific string that indicates an Action event.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
TcgMeasureAction (
IN CHAR8 *String
)
{
TCG_PCR_EVENT_HDR TcgEvent;
TcgEvent.PCRIndex = 5;
TcgEvent.EventType = EV_EFI_ACTION;
TcgEvent.EventSize = (UINT32)AsciiStrLen (String);
return TcgDxeHashLogExtendEventI (
&mTcgDxeData,
(UINT8*)String,
TcgEvent.EventSize,
&TcgEvent,
(UINT8 *) String
);
}
/**
Measure and log EFI handoff tables, and extend the measurement result into PCR[1].
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureHandoffTables (
VOID
)
{
EFI_STATUS Status;
SMBIOS_TABLE_ENTRY_POINT *SmbiosTable;
TCG_PCR_EVENT_HDR TcgEvent;
EFI_HANDOFF_TABLE_POINTERS HandoffTables;
Status = EfiGetSystemConfigurationTable (
&gEfiSmbiosTableGuid,
(VOID **) &SmbiosTable
);
if (!EFI_ERROR (Status)) {
ASSERT (SmbiosTable != NULL);
TcgEvent.PCRIndex = 1;
TcgEvent.EventType = EV_EFI_HANDOFF_TABLES;
TcgEvent.EventSize = sizeof (HandoffTables);
HandoffTables.NumberOfTables = 1;
HandoffTables.TableEntry[0].VendorGuid = gEfiSmbiosTableGuid;
HandoffTables.TableEntry[0].VendorTable = SmbiosTable;
DEBUG ((DEBUG_INFO, "The Smbios Table starts at: 0x%x\n", SmbiosTable->TableAddress));
DEBUG ((DEBUG_INFO, "The Smbios Table size: 0x%x\n", SmbiosTable->TableLength));
Status = TcgDxeHashLogExtendEventI (
&mTcgDxeData,
(UINT8*)(UINTN)SmbiosTable->TableAddress,
SmbiosTable->TableLength,
&TcgEvent,
(UINT8*)&HandoffTables
);
}
return Status;
}
/**
Measure and log Separator event, and extend the measurement result into a specific PCR.
@param[in] PCRIndex PCR index.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureSeparatorEvent (
IN TPM_PCRINDEX PCRIndex
)
{
TCG_PCR_EVENT_HDR TcgEvent;
UINT32 EventData;
EventData = 0;
TcgEvent.PCRIndex = PCRIndex;
TcgEvent.EventType = EV_SEPARATOR;
TcgEvent.EventSize = (UINT32)sizeof (EventData);
return TcgDxeHashLogExtendEventI (
&mTcgDxeData,
(UINT8 *)&EventData,
sizeof (EventData),
&TcgEvent,
(UINT8 *)&EventData
);
}
/**
Read an EFI Variable.
This function allocates a buffer to return the contents of the variable. The caller is
responsible for freeing the buffer.
@param[in] VarName A Null-terminated string that is the name of the vendor's variable.
@param[in] VendorGuid A unique identifier for the vendor.
@param[out] VarSize The size of the variable data.
@return A pointer to the buffer to return the contents of the variable.Otherwise NULL.
**/
VOID *
EFIAPI
ReadVariable (
IN CHAR16 *VarName,
IN EFI_GUID *VendorGuid,
OUT UINTN *VarSize
)
{
EFI_STATUS Status;
VOID *VarData;
*VarSize = 0;
Status = gRT->GetVariable (
VarName,
VendorGuid,
NULL,
VarSize,
NULL
);
if (Status != EFI_BUFFER_TOO_SMALL) {
return NULL;
}
VarData = AllocatePool (*VarSize);
if (VarData != NULL) {
Status = gRT->GetVariable (
VarName,
VendorGuid,
NULL,
VarSize,
VarData
);
if (EFI_ERROR (Status)) {
FreePool (VarData);
VarData = NULL;
*VarSize = 0;
}
}
return VarData;
}
/**
Measure and log an EFI variable, and extend the measurement result into a specific PCR.
@param[in] PCRIndex PCR Index.
@param[in] EventType Event type.
@param[in] VarName A Null-terminated string that is the name of the vendor's variable.
@param[in] VendorGuid A unique identifier for the vendor.
@param[in] VarData The content of the variable data.
@param[in] VarSize The size of the variable data.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES Out of memory.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureVariable (
IN TPM_PCRINDEX PCRIndex,
IN TCG_EVENTTYPE EventType,
IN CHAR16 *VarName,
IN EFI_GUID *VendorGuid,
IN VOID *VarData,
IN UINTN VarSize
)
{
EFI_STATUS Status;
TCG_PCR_EVENT_HDR TcgEvent;
UINTN VarNameLength;
EFI_VARIABLE_DATA *VarLog;
VarNameLength = StrLen (VarName);
TcgEvent.PCRIndex = PCRIndex;
TcgEvent.EventType = EventType;
TcgEvent.EventSize = (UINT32)(sizeof (*VarLog) + VarNameLength * sizeof (*VarName) + VarSize
- sizeof (VarLog->UnicodeName) - sizeof (VarLog->VariableData));
VarLog = (EFI_VARIABLE_DATA*)AllocatePool (TcgEvent.EventSize);
if (VarLog == NULL) {
return EFI_OUT_OF_RESOURCES;
}
VarLog->VariableName = *VendorGuid;
VarLog->UnicodeNameLength = VarNameLength;
VarLog->VariableDataLength = VarSize;
CopyMem (
VarLog->UnicodeName,
VarName,
VarNameLength * sizeof (*VarName)
);
CopyMem (
(CHAR16 *)VarLog->UnicodeName + VarNameLength,
VarData,
VarSize
);
Status = TcgDxeHashLogExtendEventI (
&mTcgDxeData,
(UINT8*)VarData,
VarSize,
&TcgEvent,
(UINT8*)VarLog
);
FreePool (VarLog);
return Status;
}
/**
Read then Measure and log an EFI boot variable, and extend the measurement result into PCR[5].
@param[in] VarName A Null-terminated string that is the name of the vendor's variable.
@param[in] VendorGuid A unique identifier for the vendor.
@param[out] VarSize The size of the variable data.
@param[out] VarData Pointer to the content of the variable.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES Out of memory.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
ReadAndMeasureBootVariable (
IN CHAR16 *VarName,
IN EFI_GUID *VendorGuid,
OUT UINTN *VarSize,
OUT VOID **VarData
)
{
EFI_STATUS Status;
*VarData = ReadVariable (VarName, VendorGuid, VarSize);
if (*VarData == NULL) {
return EFI_NOT_FOUND;
}
Status = MeasureVariable (
5,
EV_EFI_VARIABLE_BOOT,
VarName,
VendorGuid,
*VarData,
*VarSize
);
return Status;
}
/**
Measure and log all EFI boot variables, and extend the measurement result into a specific PCR.
The EFI boot variables are BootOrder and Boot#### variables.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_OUT_OF_RESOURCES Out of memory.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
EFIAPI
MeasureAllBootVariables (
VOID
)
{
EFI_STATUS Status;
UINT16 *BootOrder;
UINTN BootCount;
UINTN Index;
VOID *BootVarData;
UINTN Size;
Status = ReadAndMeasureBootVariable (
mBootVarName,
&gEfiGlobalVariableGuid,
&BootCount,
(VOID **) &BootOrder
);
if (Status == EFI_NOT_FOUND) {
return EFI_SUCCESS;
}
ASSERT (BootOrder != NULL);
if (EFI_ERROR (Status)) {
FreePool (BootOrder);
return Status;
}
BootCount /= sizeof (*BootOrder);
for (Index = 0; Index < BootCount; Index++) {
UnicodeSPrint (mBootVarName, sizeof (mBootVarName), L"Boot%04x", BootOrder[Index]);
Status = ReadAndMeasureBootVariable (
mBootVarName,
&gEfiGlobalVariableGuid,
&Size,
&BootVarData
);
if (!EFI_ERROR (Status)) {
FreePool (BootVarData);
}
}
FreePool (BootOrder);
return EFI_SUCCESS;
}
/**
Ready to Boot Event notification handler.
Sequence of OS boot events is measured in this event notification handler.
@param[in] Event Event whose notification function is being invoked
@param[in] Context Pointer to the notification function's context
**/
VOID
EFIAPI
OnReadyToBoot (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
TPM_PCRINDEX PcrIndex;
if (mBootAttempts == 0) {
//
// Measure handoff tables.
//
Status = MeasureHandoffTables ();
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "HOBs not Measured. Error!\n"));
}
//
// Measure BootOrder & Boot#### variables.
//
Status = MeasureAllBootVariables ();
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "Boot Variables not Measured. Error!\n"));
}
//
// 1. This is the first boot attempt.
//
Status = TcgMeasureAction (
EFI_CALLING_EFI_APPLICATION
);
ASSERT_EFI_ERROR (Status);
//
// 2. Draw a line between pre-boot env and entering post-boot env.
//
for (PcrIndex = 0; PcrIndex < 8; PcrIndex++) {
Status = MeasureSeparatorEvent (PcrIndex);
ASSERT_EFI_ERROR (Status);
}
//
// 3. Measure GPT. It would be done in SAP driver.
//
//
// 4. Measure PE/COFF OS loader. It would be done in SAP driver.
//
//
// 5. Read & Measure variable. BootOrder already measured.
//
} else {
//
// 6. Not first attempt, meaning a return from last attempt
//
Status = TcgMeasureAction (
EFI_RETURNING_FROM_EFI_APPLICATOIN
);
ASSERT_EFI_ERROR (Status);
}
DEBUG ((EFI_D_INFO, "TPM TcgDxe Measure Data when ReadyToBoot\n"));
//
// Increase boot attempt counter.
//
mBootAttempts++;
}
/**
Install TCG ACPI Table when ACPI Table Protocol is available.
A system<65><6D>s firmware uses an ACPI table to identify the system's TCG capabilities
to the Post-Boot environment. The information in this ACPI table is not guaranteed
to be valid until the Host Platform transitions from pre-boot state to post-boot state.
@param[in] Event Event whose notification function is being invoked
@param[in] Context Pointer to the notification function's context
**/
VOID
EFIAPI
InstallAcpiTable (
IN EFI_EVENT Event,
IN VOID* Context
)
{
UINTN TableKey;
EFI_STATUS Status;
EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
UINT8 Checksum;
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTable);
if (EFI_ERROR (Status)) {
return;
}
if (PcdGet8 (PcdTpmPlatformClass) == TCG_PLATFORM_TYPE_CLIENT) {
//
// The ACPI table must be checksumed before calling the InstallAcpiTable()
// service of the ACPI table protocol to install it.
//
Checksum = CalculateCheckSum8 ((UINT8 *)&mTcgClientAcpiTemplate, sizeof (mTcgClientAcpiTemplate));
mTcgClientAcpiTemplate.Header.Checksum = Checksum;
Status = AcpiTable->InstallAcpiTable (
AcpiTable,
&mTcgClientAcpiTemplate,
sizeof (mTcgClientAcpiTemplate),
&TableKey
);
} else {
//
// The ACPI table must be checksumed before calling the InstallAcpiTable()
// service of the ACPI table protocol to install it.
//
Checksum = CalculateCheckSum8 ((UINT8 *)&mTcgServerAcpiTemplate, sizeof (mTcgServerAcpiTemplate));
mTcgServerAcpiTemplate.Header.Checksum = Checksum;
Status = AcpiTable->InstallAcpiTable (
AcpiTable,
&mTcgServerAcpiTemplate,
sizeof (mTcgServerAcpiTemplate),
&TableKey
);
}
ASSERT_EFI_ERROR (Status);
}
/**
Exit Boot Services Event notification handler.
Measure invocation and success of ExitBootServices.
@param[in] Event Event whose notification function is being invoked
@param[in] Context Pointer to the notification function's context
**/
VOID
EFIAPI
OnExitBootServices (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
//
// Measure invocation of ExitBootServices,
//
Status = TcgMeasureAction (
EFI_EXIT_BOOT_SERVICES_INVOCATION
);
ASSERT_EFI_ERROR (Status);
//
// Measure success of ExitBootServices
//
Status = TcgMeasureAction (
EFI_EXIT_BOOT_SERVICES_SUCCEEDED
);
ASSERT_EFI_ERROR (Status);
}
/**
Get TPM Deactivated state.
@param[out] TPMDeactivatedFlag Returns TPM Deactivated state.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The operation was unsuccessful.
**/
EFI_STATUS
GetTpmStatus (
OUT BOOLEAN *TPMDeactivatedFlag
)
{
EFI_STATUS Status;
TPM_STCLEAR_FLAGS VFlags;
Status = TpmCommGetFlags (
mTcgDxeData.TpmHandle,
TPM_CAP_FLAG_VOLATILE,
&VFlags,
sizeof (VFlags)
);
if (!EFI_ERROR (Status)) {
*TPMDeactivatedFlag = VFlags.deactivated;
}
return Status;
}
/**
The driver's entry point.
It publishes EFI TCG Protocol.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval other Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
DriverEntry (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT Event;
VOID *Registration;
mTcgDxeData.TpmHandle = (TIS_TPM_HANDLE)(UINTN)TPM_BASE_ADDRESS;
Status = TisPcRequestUseTpm (mTcgDxeData.TpmHandle);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "TPM not detected!\n"));
return Status;
}
Status = GetTpmStatus (&mTcgDxeData.BsCap.TPMDeactivatedFlag);
if (EFI_ERROR (Status)) {
DEBUG ((
EFI_D_ERROR,
"Line %d in file " __FILE__ ":\n "
"DriverEntry: TPM not working properly\n",
__LINE__
));
return Status;
}
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gEfiTcgProtocolGuid,
EFI_NATIVE_INTERFACE,
&mTcgDxeData.TcgProtocol
);
//
// Install ACPI Table
//
EfiCreateProtocolNotifyEvent (&gEfiAcpiTableProtocolGuid, TPL_CALLBACK, InstallAcpiTable, NULL, &Registration);
if (!EFI_ERROR (Status) && !mTcgDxeData.BsCap.TPMDeactivatedFlag) {
//
// Setup the log area and copy event log from hob list to it
//
Status = SetupEventLog ();
ASSERT_EFI_ERROR (Status);
//
// Measure handoff tables, Boot#### variables etc.
//
Status = EfiCreateEventReadyToBootEx (
TPL_CALLBACK,
OnReadyToBoot,
NULL,
&Event
);
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
OnExitBootServices,
NULL,
&gEfiEventExitBootServicesGuid,
&Event
);
}
return Status;
}
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