SecurityPkg/Library/DxeTpmMeasurementLib/DxeTpmMeasurementLib.c

   1 /** @file
   2   This library is used by other modules to measure data to TPM.
   3
   4 Copyright (c) 2012, Intel Corporation. All rights reserved. <BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <PiDxe.h>
  16
  17 #include <Protocol/TcgService.h>
  18
  19 #include <Library/BaseMemoryLib.h>
  20 #include <Library/MemoryAllocationLib.h>
  21 #include <Library/UefiBootServicesTableLib.h>
  22 #include <Library/DebugLib.h>
  23 #include <Library/TpmMeasurementLib.h>
  24
  25 #include <Guid/Acpi.h>
  26 #include <IndustryStandard/Acpi.h>
  27
  28
  29
  30 /**
  31   Tpm12 measure and log data, and extend the measurement result into a specific PCR.
  32
  33   @param[in]  PcrIndex         PCR Index.
  34   @param[in]  EventType        Event type.
  35   @param[in]  EventLog         Measurement event log.
  36   @param[in]  LogLen           Event log length in bytes.
  37   @param[in]  HashData         The start of the data buffer to be hashed, extended.
  38   @param[in]  HashDataLen      The length, in bytes, of the buffer referenced by HashData
  39
  40   @retval EFI_SUCCESS           Operation completed successfully.
  41   @retval EFI_UNSUPPORTED       TPM device not available.
  42   @retval EFI_OUT_OF_RESOURCES  Out of memory.
  43   @retval EFI_DEVICE_ERROR      The operation was unsuccessful.
  44 **/
  45
  46 EFI_STATUS
  47 Tpm12MeasureAndLogData (
  48   IN UINT32             PcrIndex,
  49   IN UINT32             EventType,
  50   IN VOID               *EventLog,
  51   IN UINT32             LogLen,
  52   IN VOID               *HashData,
  53   IN UINT64             HashDataLen
  54   )
  55 {
  56   EFI_STATUS                Status;
  57   EFI_TCG_PROTOCOL          *TcgProtocol;
  58   TCG_PCR_EVENT             *TcgEvent;
  59   EFI_PHYSICAL_ADDRESS      EventLogLastEntry;
  60   UINT32                    EventNumber;
  61
  62   TcgEvent = NULL;
  63
  64   //
  65   // Tpm active/deactive state is checked in HashLogExtendEvent
  66   //
  67   Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &TcgProtocol);
  68   if (EFI_ERROR(Status)){
  69     return Status;
  70   }
  71
  72   TcgEvent = (TCG_PCR_EVENT *)AllocateZeroPool (sizeof (TCG_PCR_EVENT_HDR) + LogLen);
  73   if(TcgEvent == NULL) {
  74     return EFI_OUT_OF_RESOURCES;
  75   }
  76
  77   TcgEvent->PCRIndex  = PcrIndex;
  78   TcgEvent->EventType = EventType;
  79   TcgEvent->EventSize = LogLen;
  80   CopyMem (&TcgEvent->Event[0], EventLog, LogLen);
  81   EventNumber = 1;
  82   Status = TcgProtocol->HashLogExtendEvent (
  83                           TcgProtocol,
  84                           (EFI_PHYSICAL_ADDRESS)(UINTN)HashData,
  85                           HashDataLen,
  86                           TPM_ALG_SHA,
  87                           TcgEvent,
  88                           &EventNumber,
  89                           &EventLogLastEntry
  90                           );
  91
  92   FreePool (TcgEvent);
  93
  94   return Status;
  95 }
  96
  97 /**
  98   Tpm measure and log data, and extend the measurement result into a specific PCR.
  99
 100   @param[in]  PcrIndex         PCR Index.
 101   @param[in]  EventType        Event type.
 102   @param[in]  EventLog         Measurement event log.
 103   @param[in]  LogLen           Event log length in bytes.
 104   @param[in]  HashData         The start of the data buffer to be hashed, extended.
 105   @param[in]  HashDataLen      The length, in bytes, of the buffer referenced by HashData
 106
 107   @retval EFI_SUCCESS               Operation completed successfully.
 108   @retval EFI_UNSUPPORTED       TPM device not available.
 109   @retval EFI_OUT_OF_RESOURCES  Out of memory.
 110   @retval EFI_DEVICE_ERROR      The operation was unsuccessful.
 111 **/
 112
 113 EFI_STATUS
 114 EFIAPI
 115 TpmMeasureAndLogData (
 116   IN UINT32             PcrIndex,
 117   IN UINT32             EventType,
 118   IN VOID               *EventLog,
 119   IN UINT32             LogLen,
 120   IN VOID               *HashData,
 121   IN UINT64             HashDataLen
 122   )
 123 {
 124   EFI_STATUS  Status;
 125
 126   //
 127   // Try to measure using Tpm1.2 protocol
 128   //
 129   Status = Tpm12MeasureAndLogData(
 130                PcrIndex,
 131                EventType,
 132                EventLog,
 133                LogLen,
 134                HashData,
 135                HashDataLen
 136                );
 137
 138   return Status;
 139 }