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/** @file
Copyright (c) 2017, 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 that 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 <PiPei.h>
#include <Library/PeiServicesLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/HobLib.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/RngLib.h>
#include <Ppi/EndOfPeiPhase.h>
#define MAX_NEW_AUTHORIZATION_SIZE SHA512_DIGEST_SIZE
/**
Generate high-quality entropy source through RDRAND.
@param[in] Length Size of the buffer, in bytes, to fill with.
@param[out] Entropy Pointer to the buffer to store the entropy data.
@retval EFI_SUCCESS Entropy generation succeeded.
@retval EFI_NOT_READY Failed to request random data.
**/
EFI_STATUS
EFIAPI
RdRandGenerateEntropy (
IN UINTN Length,
OUT UINT8 *Entropy
)
{
EFI_STATUS Status;
UINTN BlockCount;
UINT64 Seed[2];
UINT8 *Ptr;
Status = EFI_NOT_READY;
BlockCount = Length / 64;
Ptr = (UINT8 *)Entropy;
//
// Generate high-quality seed for DRBG Entropy
//
while (BlockCount > 0) {
Status = GetRandomNumber128(Seed);
if (EFI_ERROR(Status)) {
return Status;
}
CopyMem(Ptr, Seed, 64);
BlockCount--;
Ptr = Ptr + 64;
}
//
// Populate the remained data as request.
//
Status = GetRandomNumber128(Seed);
if (EFI_ERROR(Status)) {
return Status;
}
CopyMem(Ptr, Seed, (Length % 64));
return Status;
}
/**
Set PlatformAuth to random value.
**/
VOID
RandomizePlatformAuth (
VOID
)
{
EFI_STATUS Status;
UINT16 AuthSize;
TPML_PCR_SELECTION Pcrs;
UINT32 Index;
UINT8 *Rand;
UINTN RandSize;
TPM2B_AUTH NewPlatformAuth;
//
// Send Tpm2HierarchyChange Auth with random value to avoid PlatformAuth being null
//
ZeroMem(&Pcrs, sizeof(TPML_PCR_SELECTION));
AuthSize = MAX_NEW_AUTHORIZATION_SIZE;
Status = Tpm2GetCapabilityPcrs(&Pcrs);
if (EFI_ERROR(Status)) {
DEBUG((EFI_D_ERROR, "Tpm2GetCapabilityPcrs fail!\n"));
} else {
for (Index = 0; Index < Pcrs.count; Index++) {
switch (Pcrs.pcrSelections[Index].hash) {
case TPM_ALG_SHA1:
AuthSize = SHA1_DIGEST_SIZE;
break;
case TPM_ALG_SHA256:
AuthSize = SHA256_DIGEST_SIZE;
break;
case TPM_ALG_SHA384:
AuthSize = SHA384_DIGEST_SIZE;
break;
case TPM_ALG_SHA512:
AuthSize = SHA512_DIGEST_SIZE;
break;
case TPM_ALG_SM3_256:
AuthSize = SM3_256_DIGEST_SIZE;
break;
}
}
}
ZeroMem(NewPlatformAuth.buffer, AuthSize);
NewPlatformAuth.size = AuthSize;
//
// Allocate one buffer to store random data.
//
RandSize = MAX_NEW_AUTHORIZATION_SIZE;
Rand = AllocatePool(RandSize);
RdRandGenerateEntropy(RandSize, Rand);
CopyMem(NewPlatformAuth.buffer, Rand, AuthSize);
FreePool(Rand);
//
// Send Tpm2HierarchyChangeAuth command with the new Auth value
//
Status = Tpm2HierarchyChangeAuth(TPM_RH_PLATFORM, NULL, &NewPlatformAuth);
DEBUG((DEBUG_INFO, "Tpm2HierarchyChangeAuth Result: - %r\n", Status));
ZeroMem(NewPlatformAuth.buffer, AuthSize);
ZeroMem(Rand, RandSize);
}
/**
This function handles PlatformInit task at the end of PEI
@param[in] PeiServices Pointer to PEI Services Table.
@param[in] NotifyDesc Pointer to the descriptor for the Notification event that
caused this function to execute.
@param[in] Ppi Pointer to the PPI data associated with this function.
@retval EFI_SUCCESS The function completes successfully
@retval others
**/
EFI_STATUS
EFIAPI
PlatformInitEndOfPei (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,
IN VOID *Ppi
)
{
VOID *TcgEventLog;
//
// Try to get TcgEventLog in S3 to see if S3 error is reported.
//
TcgEventLog = GetFirstGuidHob(&gTcgEventEntryHobGuid);
if (TcgEventLog == NULL) {
TcgEventLog = GetFirstGuidHob(&gTcgEvent2EntryHobGuid);
}
if (TcgEventLog == NULL) {
//
// no S3 error reported
//
return EFI_SUCCESS;
}
//
// If there is S3 error on TPM_SU_STATE and success on TPM_SU_CLEAR,
// Send Tpm2HierarchyChange Auth with random value to avoid PlatformAuth being null
//
RandomizePlatformAuth();
return EFI_SUCCESS;
}
static EFI_PEI_NOTIFY_DESCRIPTOR mEndOfPeiNotifyList = {
(EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiEndOfPeiSignalPpiGuid,
(EFI_PEIM_NOTIFY_ENTRY_POINT)PlatformInitEndOfPei
};
/**
Main entry
@param[in] FileHandle Handle of the file being invoked.
@param[in] PeiServices Pointer to PEI Services table.
@retval EFI_SUCCESS Install function successfully.
**/
EFI_STATUS
EFIAPI
Tcg2PlatformPeiEntryPoint (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
EFI_STATUS Status;
EFI_BOOT_MODE BootMode;
Status = PeiServicesGetBootMode (&BootMode);
ASSERT_EFI_ERROR(Status);
if (BootMode != BOOT_ON_S3_RESUME) {
return EFI_SUCCESS;
}
//
// Performing PlatformInitEndOfPei after EndOfPei PPI produced
//
Status = PeiServicesNotifyPpi (&mEndOfPeiNotifyList);
return Status;
}
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