system76-edk2/SecurityPkg/Library/Tpm2CommandLib/Tpm2Sequences.c

/** @file
  Implement TPM2 Sequences related command.

Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>

#pragma pack(1)

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPM2B_AUTH             Auth;
  TPMI_ALG_HASH          HashAlg;
} TPM2_HASH_SEQUENCE_START_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  TPMI_DH_OBJECT          SequenceHandle;
} TPM2_HASH_SEQUENCE_START_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_DH_OBJECT         SequenceHandle;
  UINT32                 AuthorizationSize;
  TPMS_AUTH_COMMAND      AuthSessionSeq;
  TPM2B_MAX_BUFFER       Buffer;
} TPM2_SEQUENCE_UPDATE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  ParameterSize;
  TPMS_AUTH_RESPONSE      AuthSessionSeq;
} TPM2_SEQUENCE_UPDATE_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_DH_PCR            PcrHandle;
  TPMI_DH_OBJECT         SequenceHandle;
  UINT32                 AuthorizationSize;
  TPMS_AUTH_COMMAND      AuthSessionPcr;
  TPMS_AUTH_COMMAND      AuthSessionSeq;
  TPM2B_MAX_BUFFER       Buffer;
} TPM2_EVENT_SEQUENCE_COMPLETE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  ParameterSize;
  TPML_DIGEST_VALUES      Results;
  TPMS_AUTH_RESPONSE      AuthSessionPcr;
  TPMS_AUTH_RESPONSE      AuthSessionSeq;
} TPM2_EVENT_SEQUENCE_COMPLETE_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_DH_OBJECT         SequenceHandle;
  UINT32                 AuthorizationSize;
  TPMS_AUTH_COMMAND      AuthSessionSeq;
  TPM2B_MAX_BUFFER       Buffer;
  TPMI_RH_HIERARCHY      Hierarchy;
} TPM2_SEQUENCE_COMPLETE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  ParameterSize;
  TPM2B_DIGEST            Digest;
  TPMS_AUTH_RESPONSE      AuthSessionSeq;
} TPM2_SEQUENCE_COMPLETE_RESPONSE;

#pragma pack()

/**
  This command starts a hash or an Event sequence.
  If hashAlg is an implemented hash, then a hash sequence is started.
  If hashAlg is TPM_ALG_NULL, then an Event sequence is started.

  @param[in]  HashAlg           The hash algorithm to use for the hash sequence
                                An Event sequence starts if this is TPM_ALG_NULL.
  @param[out] SequenceHandle    A handle to reference the sequence

  @retval EFI_SUCCESS      Operation completed successfully.
  @retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm2HashSequenceStart (
  IN TPMI_ALG_HASH    HashAlg,
  OUT TPMI_DH_OBJECT  *SequenceHandle
  )
{
  EFI_STATUS                         Status;
  TPM2_HASH_SEQUENCE_START_COMMAND   Cmd;
  TPM2_HASH_SEQUENCE_START_RESPONSE  Res;
  UINT32                             CmdSize;
  UINT32                             RespSize;
  UINT8                              *Buffer;
  UINT32                             ResultBufSize;

  ZeroMem (&Cmd, sizeof (Cmd));

  //
  // Construct command
  //
  Cmd.Header.tag         = SwapBytes16 (TPM_ST_NO_SESSIONS);
  Cmd.Header.commandCode = SwapBytes32 (TPM_CC_HashSequenceStart);

  Buffer = (UINT8 *)&Cmd.Auth;

  // auth = nullAuth
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (0));
  Buffer += sizeof (UINT16);

  // hashAlg
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (HashAlg));
  Buffer += sizeof (UINT16);

  CmdSize              = (UINT32)(Buffer - (UINT8 *)&Cmd);
  Cmd.Header.paramSize = SwapBytes32 (CmdSize);

  //
  // Call the TPM
  //
  ResultBufSize = sizeof (Res);
  Status        = Tpm2SubmitCommand (CmdSize, (UINT8 *)&Cmd, &ResultBufSize, (UINT8 *)&Res);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (ResultBufSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "HashSequenceStart: Failed ExecuteCommand: Buffer Too Small\r\n"));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Validate response headers
  //
  RespSize = SwapBytes32 (Res.Header.paramSize);
  if (RespSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "HashSequenceStart: Response size too large! %d\r\n", RespSize));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Fail if command failed
  //
  if (SwapBytes32 (Res.Header.responseCode) != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "HashSequenceStart: Response Code error! 0x%08x\r\n", SwapBytes32 (Res.Header.responseCode)));
    return EFI_DEVICE_ERROR;
  }

  //
  // Unmarshal the response
  //

  // sequenceHandle
  *SequenceHandle = SwapBytes32 (Res.SequenceHandle);

  return EFI_SUCCESS;
}

/**
  This command is used to add data to a hash or HMAC sequence.
  The amount of data in buffer may be any size up to the limits of the TPM.
  NOTE: In all TPM, a buffer size of 1,024 octets is allowed.

  @param[in] SequenceHandle    Handle for the sequence object
  @param[in] Buffer            Data to be added to hash

  @retval EFI_SUCCESS      Operation completed successfully.
  @retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm2SequenceUpdate (
  IN TPMI_DH_OBJECT    SequenceHandle,
  IN TPM2B_MAX_BUFFER  *Buffer
  )
{
  EFI_STATUS                     Status;
  TPM2_SEQUENCE_UPDATE_COMMAND   Cmd;
  TPM2_SEQUENCE_UPDATE_RESPONSE  Res;
  UINT32                         CmdSize;
  UINT32                         RespSize;
  UINT8                          *BufferPtr;
  UINT32                         SessionInfoSize;
  UINT32                         ResultBufSize;

  ZeroMem (&Cmd, sizeof (Cmd));

  //
  // Construct command
  //
  Cmd.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  Cmd.Header.commandCode = SwapBytes32 (TPM_CC_SequenceUpdate);
  Cmd.SequenceHandle     = SwapBytes32 (SequenceHandle);

  //
  // Add in Auth session
  //
  BufferPtr = (UINT8 *)&Cmd.AuthSessionSeq;

  // sessionInfoSize
  SessionInfoSize       = CopyAuthSessionCommand (NULL, BufferPtr);
  BufferPtr            += SessionInfoSize;
  Cmd.AuthorizationSize = SwapBytes32 (SessionInfoSize);

  // buffer.size
  WriteUnaligned16 ((UINT16 *)BufferPtr, SwapBytes16 (Buffer->size));
  BufferPtr += sizeof (UINT16);

  CopyMem (BufferPtr, &Buffer->buffer, Buffer->size);
  BufferPtr += Buffer->size;

  CmdSize              = (UINT32)(BufferPtr - (UINT8 *)&Cmd);
  Cmd.Header.paramSize = SwapBytes32 (CmdSize);

  //
  // Call the TPM
  //
  ResultBufSize = sizeof (Res);
  Status        = Tpm2SubmitCommand (CmdSize, (UINT8 *)&Cmd, &ResultBufSize, (UINT8 *)&Res);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (ResultBufSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "SequenceUpdate: Failed ExecuteCommand: Buffer Too Small\r\n"));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Validate response headers
  //
  RespSize = SwapBytes32 (Res.Header.paramSize);
  if (RespSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "SequenceUpdate: Response size too large! %d\r\n", RespSize));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Fail if command failed
  //
  if (SwapBytes32 (Res.Header.responseCode) != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "SequenceUpdate: Response Code error! 0x%08x\r\n", SwapBytes32 (Res.Header.responseCode)));
    return EFI_DEVICE_ERROR;
  }

  //
  // Unmarshal the response
  //

  // None

  return EFI_SUCCESS;
}

/**
  This command adds the last part of data, if any, to an Event sequence and returns the result in a digest list.
  If pcrHandle references a PCR and not TPM_RH_NULL, then the returned digest list is processed in
  the same manner as the digest list input parameter to TPM2_PCR_Extend() with the pcrHandle in each
  bank extended with the associated digest value.

  @param[in]  PcrHandle         PCR to be extended with the Event data
  @param[in]  SequenceHandle    Authorization for the sequence
  @param[in]  Buffer            Data to be added to the Event
  @param[out] Results           List of digests computed for the PCR

  @retval EFI_SUCCESS      Operation completed successfully.
  @retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm2EventSequenceComplete (
  IN TPMI_DH_PCR          PcrHandle,
  IN TPMI_DH_OBJECT       SequenceHandle,
  IN TPM2B_MAX_BUFFER     *Buffer,
  OUT TPML_DIGEST_VALUES  *Results
  )
{
  EFI_STATUS                             Status;
  TPM2_EVENT_SEQUENCE_COMPLETE_COMMAND   Cmd;
  TPM2_EVENT_SEQUENCE_COMPLETE_RESPONSE  Res;
  UINT32                                 CmdSize;
  UINT32                                 RespSize;
  UINT8                                  *BufferPtr;
  UINT32                                 SessionInfoSize;
  UINT32                                 SessionInfoSize2;
  UINT32                                 Index;
  UINT32                                 ResultBufSize;
  UINT16                                 DigestSize;

  ZeroMem (&Cmd, sizeof (Cmd));

  //
  // Construct command
  //
  Cmd.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  Cmd.Header.commandCode = SwapBytes32 (TPM_CC_EventSequenceComplete);
  Cmd.PcrHandle          = SwapBytes32 (PcrHandle);
  Cmd.SequenceHandle     = SwapBytes32 (SequenceHandle);

  //
  // Add in pcrHandle Auth session
  //
  BufferPtr = (UINT8 *)&Cmd.AuthSessionPcr;

  // sessionInfoSize
  SessionInfoSize = CopyAuthSessionCommand (NULL, BufferPtr);
  BufferPtr      += SessionInfoSize;

  // sessionInfoSize
  SessionInfoSize2      = CopyAuthSessionCommand (NULL, BufferPtr);
  BufferPtr            += SessionInfoSize2;
  Cmd.AuthorizationSize = SwapBytes32 (SessionInfoSize + SessionInfoSize2);

  // buffer.size
  WriteUnaligned16 ((UINT16 *)BufferPtr, SwapBytes16 (Buffer->size));
  BufferPtr += sizeof (UINT16);

  CopyMem (BufferPtr, &Buffer->buffer[0], Buffer->size);
  BufferPtr += Buffer->size;

  CmdSize              = (UINT32)(BufferPtr - (UINT8 *)&Cmd);
  Cmd.Header.paramSize = SwapBytes32 (CmdSize);

  //
  // Call the TPM
  //
  ResultBufSize = sizeof (Res);
  Status        = Tpm2SubmitCommand (CmdSize, (UINT8 *)&Cmd, &ResultBufSize, (UINT8 *)&Res);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (ResultBufSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "EventSequenceComplete: Failed ExecuteCommand: Buffer Too Small\r\n"));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Validate response headers
  //
  RespSize = SwapBytes32 (Res.Header.paramSize);
  if (RespSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "EventSequenceComplete: Response size too large! %d\r\n", RespSize));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Fail if command failed
  //
  if (SwapBytes32 (Res.Header.responseCode) != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "EventSequenceComplete: Response Code error! 0x%08x\r\n", SwapBytes32 (Res.Header.responseCode)));
    return EFI_DEVICE_ERROR;
  }

  //
  // Unmarshal the response
  //

  BufferPtr = (UINT8 *)&Res.Results;

  // count
  Results->count = SwapBytes32 (ReadUnaligned32 ((UINT32 *)BufferPtr));
  if (Results->count > HASH_COUNT) {
    DEBUG ((DEBUG_ERROR, "Tpm2EventSequenceComplete - Results->count error %x\n", Results->count));
    return EFI_DEVICE_ERROR;
  }

  BufferPtr += sizeof (UINT32);

  for (Index = 0; Index < Results->count; Index++) {
    Results->digests[Index].hashAlg = SwapBytes16 (ReadUnaligned16 ((UINT16 *)BufferPtr));
    BufferPtr                      += sizeof (UINT16);

    DigestSize = GetHashSizeFromAlgo (Results->digests[Index].hashAlg);
    if (DigestSize == 0) {
      DEBUG ((DEBUG_ERROR, "EventSequenceComplete: Unknown hash algorithm %d\r\n", Results->digests[Index].hashAlg));
      return EFI_DEVICE_ERROR;
    }

    CopyMem (
      &Results->digests[Index].digest,
      BufferPtr,
      DigestSize
      );
    BufferPtr += DigestSize;
  }

  return EFI_SUCCESS;
}

/**
  This command adds the last part of data, if any, to a hash/HMAC sequence and returns the result.

  @param[in]  SequenceHandle    Authorization for the sequence
  @param[in]  Buffer            Data to be added to the hash/HMAC
  @param[out] Result            The returned HMAC or digest in a sized buffer

  @retval EFI_SUCCESS      Operation completed successfully.
  @retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm2SequenceComplete (
  IN TPMI_DH_OBJECT    SequenceHandle,
  IN TPM2B_MAX_BUFFER  *Buffer,
  OUT TPM2B_DIGEST     *Result
  )
{
  EFI_STATUS                       Status;
  TPM2_SEQUENCE_COMPLETE_COMMAND   Cmd;
  TPM2_SEQUENCE_COMPLETE_RESPONSE  Res;
  UINT32                           CmdSize;
  UINT32                           RespSize;
  UINT8                            *BufferPtr;
  UINT32                           SessionInfoSize;
  UINT32                           ResultBufSize;

  ZeroMem (&Cmd, sizeof (Cmd));

  //
  // Construct command
  //
  Cmd.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  Cmd.Header.commandCode = SwapBytes32 (TPM_CC_SequenceComplete);
  Cmd.SequenceHandle     = SwapBytes32 (SequenceHandle);

  //
  // Add in Auth session
  //
  BufferPtr = (UINT8 *)&Cmd.AuthSessionSeq;

  // sessionInfoSize
  SessionInfoSize       = CopyAuthSessionCommand (NULL, BufferPtr);
  BufferPtr            += SessionInfoSize;
  Cmd.AuthorizationSize = SwapBytes32 (SessionInfoSize);

  // buffer.size
  WriteUnaligned16 ((UINT16 *)BufferPtr, SwapBytes16 (Buffer->size));
  BufferPtr += sizeof (UINT16);

  CopyMem (BufferPtr, &Buffer->buffer[0], Buffer->size);
  BufferPtr += Buffer->size;

  // Hierarchy
  WriteUnaligned32 ((UINT32 *)BufferPtr, SwapBytes32 (TPM_RH_NULL));
  BufferPtr += sizeof (UINT32);

  CmdSize              = (UINT32)(BufferPtr - (UINT8 *)&Cmd);
  Cmd.Header.paramSize = SwapBytes32 (CmdSize);

  //
  // Call the TPM
  //
  ResultBufSize = sizeof (Res);
  Status        = Tpm2SubmitCommand (CmdSize, (UINT8 *)&Cmd, &ResultBufSize, (UINT8 *)&Res);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (ResultBufSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "SequenceComplete: Failed ExecuteCommand: Buffer Too Small\r\n"));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Validate response headers
  //
  RespSize = SwapBytes32 (Res.Header.paramSize);
  if (RespSize > sizeof (Res)) {
    DEBUG ((DEBUG_ERROR, "SequenceComplete: Response size too large! %d\r\n", RespSize));
    return EFI_BUFFER_TOO_SMALL;
  }

  //
  // Fail if command failed
  //
  if (SwapBytes32 (Res.Header.responseCode) != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "SequenceComplete: Response Code error! 0x%08x\r\n", SwapBytes32 (Res.Header.responseCode)));
    return EFI_DEVICE_ERROR;
  }

  //
  // Unmarshal the response
  //

  BufferPtr = (UINT8 *)&Res.Digest;

  // digestSize
  Result->size = SwapBytes16 (ReadUnaligned16 ((UINT16 *)BufferPtr));
  if (Result->size > sizeof (TPMU_HA)) {
    DEBUG ((DEBUG_ERROR, "Tpm2SequenceComplete - Result->size error %x\n", Result->size));
    return EFI_DEVICE_ERROR;
  }

  BufferPtr += sizeof (UINT16);

  CopyMem (
    Result->buffer,
    BufferPtr,
    Result->size
    );

  return EFI_SUCCESS;
}