mirror of https://github.com/acidanthera/audk.git
438 lines
13 KiB
C
438 lines
13 KiB
C
/** @file
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This library is BaseCrypto router. It will redirect hash request to each individual
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hash handler registerd, such as SHA1, SHA256.
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Platform can use PcdTpm2HashMask to mask some hash engines.
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Copyright (c) 2013 - 2017, Intel Corporation. All rights reserved. <BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiPei.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/Tpm2CommandLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/HobLib.h>
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#include <Library/HashLib.h>
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#include <Guid/ZeroGuid.h>
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#include "HashLibBaseCryptoRouterCommon.h"
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#define HASH_LIB_PEI_ROUTER_GUID \
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{ 0x84681c08, 0x6873, 0x46f3, { 0x8b, 0xb7, 0xab, 0x66, 0x18, 0x95, 0xa1, 0xb3 } }
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EFI_GUID mHashLibPeiRouterGuid = HASH_LIB_PEI_ROUTER_GUID;
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typedef struct {
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//
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// If gZeroGuid, SupportedHashMask is 0 for FIRST module which consumes HashLib
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// or the hash algorithm bitmap of LAST module which consumes HashLib.
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// HashInterfaceCount and HashInterface are all 0.
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// If gEfiCallerIdGuid, HashInterfaceCount, HashInterface and SupportedHashMask
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// are the hash interface information of CURRENT module which consumes HashLib.
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//
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EFI_GUID Identifier;
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UINTN HashInterfaceCount;
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HASH_INTERFACE HashInterface[HASH_COUNT];
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UINT32 SupportedHashMask;
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} HASH_INTERFACE_HOB;
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/**
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This function gets hash interface hob.
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@param Identifier Identifier to get hash interface hob.
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@retval hash interface hob.
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**/
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HASH_INTERFACE_HOB *
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InternalGetHashInterfaceHob (
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EFI_GUID *Identifier
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)
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{
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EFI_PEI_HOB_POINTERS Hob;
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HASH_INTERFACE_HOB *HashInterfaceHob;
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Hob.Raw = GetFirstGuidHob (&mHashLibPeiRouterGuid);
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while (Hob.Raw != NULL) {
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HashInterfaceHob = GET_GUID_HOB_DATA (Hob);
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if (CompareGuid (&HashInterfaceHob->Identifier, Identifier)) {
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//
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// Found the matched one.
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//
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return HashInterfaceHob;
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}
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Hob.Raw = GET_NEXT_HOB (Hob);
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Hob.Raw = GetNextGuidHob (&mHashLibPeiRouterGuid, Hob.Raw);
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}
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return NULL;
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}
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/**
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This function creates hash interface hob.
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@param Identifier Identifier to create hash interface hob.
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@retval hash interface hob.
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**/
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HASH_INTERFACE_HOB *
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InternalCreateHashInterfaceHob (
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EFI_GUID *Identifier
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)
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{
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HASH_INTERFACE_HOB LocalHashInterfaceHob;
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ZeroMem (&LocalHashInterfaceHob, sizeof(LocalHashInterfaceHob));
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CopyGuid (&LocalHashInterfaceHob.Identifier, Identifier);
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return BuildGuidDataHob (&mHashLibPeiRouterGuid, &LocalHashInterfaceHob, sizeof(LocalHashInterfaceHob));
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}
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/**
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Check mismatch of supported HashMask between modules
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that may link different HashInstanceLib instances.
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@param HashInterfaceHobCurrent Pointer to hash interface hob for CURRENT module.
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**/
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VOID
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CheckSupportedHashMaskMismatch (
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IN HASH_INTERFACE_HOB *HashInterfaceHobCurrent
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)
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{
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HASH_INTERFACE_HOB *HashInterfaceHobLast;
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HashInterfaceHobLast = InternalGetHashInterfaceHob (&gZeroGuid);
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ASSERT (HashInterfaceHobLast != NULL);
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if ((HashInterfaceHobLast->SupportedHashMask != 0) &&
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(HashInterfaceHobCurrent->SupportedHashMask != HashInterfaceHobLast->SupportedHashMask)) {
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DEBUG ((
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DEBUG_WARN,
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"WARNING: There is mismatch of supported HashMask (0x%x - 0x%x) between modules\n",
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HashInterfaceHobCurrent->SupportedHashMask,
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HashInterfaceHobLast->SupportedHashMask
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));
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DEBUG ((DEBUG_WARN, "that are linking different HashInstanceLib instances!\n"));
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}
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}
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/**
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Start hash sequence.
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@param HashHandle Hash handle.
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@retval EFI_SUCCESS Hash sequence start and HandleHandle returned.
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@retval EFI_OUT_OF_RESOURCES No enough resource to start hash.
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**/
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EFI_STATUS
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EFIAPI
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HashStart (
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OUT HASH_HANDLE *HashHandle
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)
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{
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HASH_INTERFACE_HOB *HashInterfaceHob;
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HASH_HANDLE *HashCtx;
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UINTN Index;
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UINT32 HashMask;
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_UNSUPPORTED;
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}
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if (HashInterfaceHob->HashInterfaceCount == 0) {
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return EFI_UNSUPPORTED;
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}
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CheckSupportedHashMaskMismatch (HashInterfaceHob);
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HashCtx = AllocatePool (sizeof(*HashCtx) * HashInterfaceHob->HashInterfaceCount);
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ASSERT (HashCtx != NULL);
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for (Index = 0; Index < HashInterfaceHob->HashInterfaceCount; Index++) {
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HashMask = Tpm2GetHashMaskFromAlgo (&HashInterfaceHob->HashInterface[Index].HashGuid);
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if ((HashMask & PcdGet32 (PcdTpm2HashMask)) != 0) {
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HashInterfaceHob->HashInterface[Index].HashInit (&HashCtx[Index]);
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}
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}
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*HashHandle = (HASH_HANDLE)HashCtx;
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return EFI_SUCCESS;
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}
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/**
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Update hash sequence data.
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@param HashHandle Hash handle.
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@param DataToHash Data to be hashed.
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@param DataToHashLen Data size.
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@retval EFI_SUCCESS Hash sequence updated.
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**/
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EFI_STATUS
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EFIAPI
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HashUpdate (
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IN HASH_HANDLE HashHandle,
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IN VOID *DataToHash,
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IN UINTN DataToHashLen
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)
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{
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HASH_INTERFACE_HOB *HashInterfaceHob;
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HASH_HANDLE *HashCtx;
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UINTN Index;
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UINT32 HashMask;
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_UNSUPPORTED;
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}
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if (HashInterfaceHob->HashInterfaceCount == 0) {
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return EFI_UNSUPPORTED;
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}
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CheckSupportedHashMaskMismatch (HashInterfaceHob);
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HashCtx = (HASH_HANDLE *)HashHandle;
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for (Index = 0; Index < HashInterfaceHob->HashInterfaceCount; Index++) {
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HashMask = Tpm2GetHashMaskFromAlgo (&HashInterfaceHob->HashInterface[Index].HashGuid);
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if ((HashMask & PcdGet32 (PcdTpm2HashMask)) != 0) {
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HashInterfaceHob->HashInterface[Index].HashUpdate (HashCtx[Index], DataToHash, DataToHashLen);
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}
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}
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return EFI_SUCCESS;
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}
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/**
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Hash sequence complete and extend to PCR.
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@param HashHandle Hash handle.
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@param PcrIndex PCR to be extended.
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@param DataToHash Data to be hashed.
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@param DataToHashLen Data size.
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@param DigestList Digest list.
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@retval EFI_SUCCESS Hash sequence complete and DigestList is returned.
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**/
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EFI_STATUS
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EFIAPI
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HashCompleteAndExtend (
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IN HASH_HANDLE HashHandle,
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IN TPMI_DH_PCR PcrIndex,
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IN VOID *DataToHash,
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IN UINTN DataToHashLen,
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OUT TPML_DIGEST_VALUES *DigestList
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)
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{
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TPML_DIGEST_VALUES Digest;
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HASH_INTERFACE_HOB *HashInterfaceHob;
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HASH_HANDLE *HashCtx;
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UINTN Index;
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EFI_STATUS Status;
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UINT32 HashMask;
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_UNSUPPORTED;
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}
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if (HashInterfaceHob->HashInterfaceCount == 0) {
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return EFI_UNSUPPORTED;
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}
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CheckSupportedHashMaskMismatch (HashInterfaceHob);
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HashCtx = (HASH_HANDLE *)HashHandle;
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ZeroMem (DigestList, sizeof(*DigestList));
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for (Index = 0; Index < HashInterfaceHob->HashInterfaceCount; Index++) {
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HashMask = Tpm2GetHashMaskFromAlgo (&HashInterfaceHob->HashInterface[Index].HashGuid);
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if ((HashMask & PcdGet32 (PcdTpm2HashMask)) != 0) {
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HashInterfaceHob->HashInterface[Index].HashUpdate (HashCtx[Index], DataToHash, DataToHashLen);
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HashInterfaceHob->HashInterface[Index].HashFinal (HashCtx[Index], &Digest);
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Tpm2SetHashToDigestList (DigestList, &Digest);
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}
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}
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FreePool (HashCtx);
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Status = Tpm2PcrExtend (
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PcrIndex,
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DigestList
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);
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return Status;
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}
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/**
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Hash data and extend to PCR.
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@param PcrIndex PCR to be extended.
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@param DataToHash Data to be hashed.
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@param DataToHashLen Data size.
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@param DigestList Digest list.
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@retval EFI_SUCCESS Hash data and DigestList is returned.
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**/
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EFI_STATUS
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EFIAPI
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HashAndExtend (
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IN TPMI_DH_PCR PcrIndex,
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IN VOID *DataToHash,
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IN UINTN DataToHashLen,
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OUT TPML_DIGEST_VALUES *DigestList
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)
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{
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HASH_INTERFACE_HOB *HashInterfaceHob;
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HASH_HANDLE HashHandle;
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EFI_STATUS Status;
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_UNSUPPORTED;
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}
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if (HashInterfaceHob->HashInterfaceCount == 0) {
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return EFI_UNSUPPORTED;
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}
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CheckSupportedHashMaskMismatch (HashInterfaceHob);
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HashStart (&HashHandle);
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HashUpdate (HashHandle, DataToHash, DataToHashLen);
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Status = HashCompleteAndExtend (HashHandle, PcrIndex, NULL, 0, DigestList);
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return Status;
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}
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/**
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This service register Hash.
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@param HashInterface Hash interface
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@retval EFI_SUCCESS This hash interface is registered successfully.
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@retval EFI_UNSUPPORTED System does not support register this interface.
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@retval EFI_ALREADY_STARTED System already register this interface.
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**/
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EFI_STATUS
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EFIAPI
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RegisterHashInterfaceLib (
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IN HASH_INTERFACE *HashInterface
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)
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{
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UINTN Index;
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HASH_INTERFACE_HOB *HashInterfaceHob;
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UINT32 HashMask;
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EFI_STATUS Status;
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//
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// Check allow
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//
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HashMask = Tpm2GetHashMaskFromAlgo (&HashInterface->HashGuid);
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if ((HashMask & PcdGet32 (PcdTpm2HashMask)) == 0) {
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return EFI_UNSUPPORTED;
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}
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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HashInterfaceHob = InternalCreateHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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}
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if (HashInterfaceHob->HashInterfaceCount >= HASH_COUNT) {
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return EFI_OUT_OF_RESOURCES;
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}
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//
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// Check duplication
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//
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for (Index = 0; Index < HashInterfaceHob->HashInterfaceCount; Index++) {
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if (CompareGuid (&HashInterfaceHob->HashInterface[Index].HashGuid, &HashInterface->HashGuid)) {
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DEBUG ((DEBUG_ERROR, "Hash Interface (%g) has been registered\n", &HashInterface->HashGuid));
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return EFI_ALREADY_STARTED;
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}
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}
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//
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// Record hash algorithm bitmap of CURRENT module which consumes HashLib.
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//
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HashInterfaceHob->SupportedHashMask = PcdGet32 (PcdTcg2HashAlgorithmBitmap) | HashMask;
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Status = PcdSet32S (PcdTcg2HashAlgorithmBitmap, HashInterfaceHob->SupportedHashMask);
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ASSERT_EFI_ERROR (Status);
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CopyMem (&HashInterfaceHob->HashInterface[HashInterfaceHob->HashInterfaceCount], HashInterface, sizeof(*HashInterface));
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HashInterfaceHob->HashInterfaceCount ++;
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return EFI_SUCCESS;
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}
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/**
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The constructor function of HashLibBaseCryptoRouterPei.
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@param FileHandle The handle of FFS header the loaded driver.
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@param PeiServices The pointer to the PEI services.
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@retval EFI_SUCCESS The constructor executes successfully.
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@retval EFI_OUT_OF_RESOURCES There is no enough resource for the constructor.
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**/
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EFI_STATUS
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EFIAPI
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HashLibBaseCryptoRouterPeiConstructor (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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EFI_STATUS Status;
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HASH_INTERFACE_HOB *HashInterfaceHob;
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HashInterfaceHob = InternalGetHashInterfaceHob (&gZeroGuid);
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if (HashInterfaceHob == NULL) {
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//
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// No HOB with gZeroGuid Identifier has been created,
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// this is FIRST module which consumes HashLib.
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// Create the HOB with gZeroGuid Identifier.
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//
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HashInterfaceHob = InternalCreateHashInterfaceHob (&gZeroGuid);
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if (HashInterfaceHob == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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} else {
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//
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// Record hash algorithm bitmap of LAST module which also consumes HashLib.
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//
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HashInterfaceHob->SupportedHashMask = PcdGet32 (PcdTcg2HashAlgorithmBitmap);
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}
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HashInterfaceHob = InternalGetHashInterfaceHob (&gEfiCallerIdGuid);
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if (HashInterfaceHob != NULL) {
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//
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// In PEI phase, some modules may call RegisterForShadow and will be
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// shadowed and executed again after memory is discovered.
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// This is the second execution of this module, clear the hash interface
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// information registered at its first execution.
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//
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ZeroMem (&HashInterfaceHob->HashInterface, sizeof (*HashInterfaceHob) - sizeof (EFI_GUID));
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}
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//
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// Set PcdTcg2HashAlgorithmBitmap to 0 in CONSTRUCTOR for CURRENT module.
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//
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Status = PcdSet32S (PcdTcg2HashAlgorithmBitmap, 0);
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ASSERT_EFI_ERROR (Status);
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return EFI_SUCCESS;
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}
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