/** @file
  Opal Password PEI driver which is used to unlock Opal Password for S3.

Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "OpalPasswordPei.h"

EFI_GUID  mOpalDeviceLockBoxGuid = OPAL_DEVICE_LOCKBOX_GUID;

/**
  Send a security protocol command to a device that receives data and/or the result
  of one or more commands sent by SendData.

  The ReceiveData function sends a security protocol command to the given MediaId.
  The security protocol command sent is defined by SecurityProtocolId and contains
  the security protocol specific data SecurityProtocolSpecificData. The function
  returns the data from the security protocol command in PayloadBuffer.

  For devices supporting the SCSI command set, the security protocol command is sent
  using the SECURITY PROTOCOL IN command defined in SPC-4.

  For devices supporting the ATA command set, the security protocol command is sent
  using one of the TRUSTED RECEIVE commands defined in ATA8-ACS if PayloadBufferSize
  is non-zero.

  If the PayloadBufferSize is zero, the security protocol command is sent using the
  Trusted Non-Data command defined in ATA8-ACS.

  If PayloadBufferSize is too small to store the available data from the security
  protocol command, the function shall copy PayloadBufferSize bytes into the
  PayloadBuffer and return EFI_WARN_BUFFER_TOO_SMALL.

  If PayloadBuffer or PayloadTransferSize is NULL and PayloadBufferSize is non-zero,
  the function shall return EFI_INVALID_PARAMETER.

  If the given MediaId does not support security protocol commands, the function shall
  return EFI_UNSUPPORTED. If there is no media in the device, the function returns
  EFI_NO_MEDIA. If the MediaId is not the ID for the current media in the device,
  the function returns EFI_MEDIA_CHANGED.

  If the security protocol fails to complete within the Timeout period, the function
  shall return EFI_TIMEOUT.

  If the security protocol command completes without an error, the function shall
  return EFI_SUCCESS. If the security protocol command completes with an error, the
  function shall return EFI_DEVICE_ERROR.

  @param  This                         Indicates a pointer to the calling context.
  @param  MediaId                      ID of the medium to receive data from. If there is no
                                       block IO protocol supported by the physical device, the
                                       value of MediaId is undefined.
  @param  Timeout                      The timeout, in 100ns units, to use for the execution
                                       of the security protocol command. A Timeout value of 0
                                       means that this function will wait indefinitely for the
                                       security protocol command to execute. If Timeout is greater
                                       than zero, then this function will return EFI_TIMEOUT
                                       if the time required to execute the receive data command
                                       is greater than Timeout.
  @param  SecurityProtocolId           The value of the "Security Protocol" parameter of
                                       the security protocol command to be sent.
  @param  SecurityProtocolSpecificData The value of the "Security Protocol Specific" parameter
                                       of the security protocol command to be sent.
  @param  PayloadBufferSize            Size in bytes of the payload data buffer.
  @param  PayloadBuffer                A pointer to a destination buffer to store the security
                                       protocol command specific payload data for the security
                                       protocol command. The caller is responsible for having
                                       either implicit or explicit ownership of the buffer.
  @param  PayloadTransferSize          A pointer to a buffer to store the size in bytes of the
                                       data written to the payload data buffer.

  @retval EFI_SUCCESS                  The security protocol command completed successfully.
  @retval EFI_WARN_BUFFER_TOO_SMALL    The PayloadBufferSize was too small to store the available
                                       data from the device. The PayloadBuffer contains the truncated data.
  @retval EFI_UNSUPPORTED              The given MediaId does not support security protocol commands.
  @retval EFI_DEVICE_ERROR             The security protocol command completed with an error.
  @retval EFI_NO_MEDIA                 There is no media in the device.
  @retval EFI_MEDIA_CHANGED            The MediaId is not for the current media.
  @retval EFI_INVALID_PARAMETER        The PayloadBuffer or PayloadTransferSize is NULL and
                                       PayloadBufferSize is non-zero.
  @retval EFI_TIMEOUT                  A timeout occurred while waiting for the security
                                       protocol command to execute.

**/
EFI_STATUS
EFIAPI
SecurityReceiveData (
  IN  EFI_STORAGE_SECURITY_COMMAND_PROTOCOL  *This,
  IN  UINT32                                 MediaId,
  IN  UINT64                                 Timeout,
  IN  UINT8                                  SecurityProtocolId,
  IN  UINT16                                 SecurityProtocolSpecificData,
  IN  UINTN                                  PayloadBufferSize,
  OUT VOID                                   *PayloadBuffer,
  OUT UINTN                                  *PayloadTransferSize
  )
{
  OPAL_PEI_DEVICE  *PeiDev;

  PeiDev = OPAL_PEI_DEVICE_FROM_THIS (This);
  if (PeiDev == NULL) {
    return EFI_DEVICE_ERROR;
  }

  return PeiDev->SscPpi->ReceiveData (
                           PeiDev->SscPpi,
                           PeiDev->DeviceIndex,
                           SSC_PPI_GENERIC_TIMEOUT,
                           SecurityProtocolId,
                           SecurityProtocolSpecificData,
                           PayloadBufferSize,
                           PayloadBuffer,
                           PayloadTransferSize
                           );
}

/**
  Send a security protocol command to a device.

  The SendData function sends a security protocol command containing the payload
  PayloadBuffer to the given MediaId. The security protocol command sent is
  defined by SecurityProtocolId and contains the security protocol specific data
  SecurityProtocolSpecificData. If the underlying protocol command requires a
  specific padding for the command payload, the SendData function shall add padding
  bytes to the command payload to satisfy the padding requirements.

  For devices supporting the SCSI command set, the security protocol command is sent
  using the SECURITY PROTOCOL OUT command defined in SPC-4.

  For devices supporting the ATA command set, the security protocol command is sent
  using one of the TRUSTED SEND commands defined in ATA8-ACS if PayloadBufferSize
  is non-zero. If the PayloadBufferSize is zero, the security protocol command is
  sent using the Trusted Non-Data command defined in ATA8-ACS.

  If PayloadBuffer is NULL and PayloadBufferSize is non-zero, the function shall
  return EFI_INVALID_PARAMETER.

  If the given MediaId does not support security protocol commands, the function
  shall return EFI_UNSUPPORTED. If there is no media in the device, the function
  returns EFI_NO_MEDIA. If the MediaId is not the ID for the current media in the
  device, the function returns EFI_MEDIA_CHANGED.

  If the security protocol fails to complete within the Timeout period, the function
  shall return EFI_TIMEOUT.

  If the security protocol command completes without an error, the function shall return
  EFI_SUCCESS. If the security protocol command completes with an error, the function
  shall return EFI_DEVICE_ERROR.

  @param  This                         Indicates a pointer to the calling context.
  @param  MediaId                      ID of the medium to receive data from. If there is no
                                       block IO protocol supported by the physical device, the
                                       value of MediaId is undefined.
  @param  Timeout                      The timeout, in 100ns units, to use for the execution
                                       of the security protocol command. A Timeout value of 0
                                       means that this function will wait indefinitely for the
                                       security protocol command to execute. If Timeout is greater
                                       than zero, then this function will return EFI_TIMEOUT
                                       if the time required to execute the send data command
                                       is greater than Timeout.
  @param  SecurityProtocolId           The value of the "Security Protocol" parameter of
                                       the security protocol command to be sent.
  @param  SecurityProtocolSpecificData The value of the "Security Protocol Specific" parameter
                                       of the security protocol command to be sent.
  @param  PayloadBufferSize            Size in bytes of the payload data buffer.
  @param  PayloadBuffer                A pointer to a destination buffer to store the security
                                       protocol command specific payload data for the security
                                       protocol command.

  @retval EFI_SUCCESS                  The security protocol command completed successfully.
  @retval EFI_UNSUPPORTED              The given MediaId does not support security protocol commands.
  @retval EFI_DEVICE_ERROR             The security protocol command completed with an error.
  @retval EFI_NO_MEDIA                 There is no media in the device.
  @retval EFI_MEDIA_CHANGED            The MediaId is not for the current media.
  @retval EFI_INVALID_PARAMETER        The PayloadBuffer is NULL and PayloadBufferSize is non-zero.
  @retval EFI_TIMEOUT                  A timeout occurred while waiting for the security
                                       protocol command to execute.

**/
EFI_STATUS
EFIAPI
SecuritySendData (
  IN EFI_STORAGE_SECURITY_COMMAND_PROTOCOL  *This,
  IN UINT32                                 MediaId,
  IN UINT64                                 Timeout,
  IN UINT8                                  SecurityProtocolId,
  IN UINT16                                 SecurityProtocolSpecificData,
  IN UINTN                                  PayloadBufferSize,
  IN VOID                                   *PayloadBuffer
  )
{
  OPAL_PEI_DEVICE  *PeiDev;

  PeiDev = OPAL_PEI_DEVICE_FROM_THIS (This);
  if (PeiDev == NULL) {
    return EFI_DEVICE_ERROR;
  }

  return PeiDev->SscPpi->SendData (
                           PeiDev->SscPpi,
                           PeiDev->DeviceIndex,
                           SSC_PPI_GENERIC_TIMEOUT,
                           SecurityProtocolId,
                           SecurityProtocolSpecificData,
                           PayloadBufferSize,
                           PayloadBuffer
                           );
}

/**

  The function returns whether or not the device is Opal Locked.
  TRUE means that the device is partially or fully locked.
  This will perform a Level 0 Discovery and parse the locking feature descriptor

  @param[in]      OpalDev             Opal object to determine if locked.
  @param[out]     BlockSidSupported   Whether device support BlockSid feature.

**/
BOOLEAN
IsOpalDeviceLocked (
  OPAL_PEI_DEVICE  *OpalDev,
  BOOLEAN          *BlockSidSupported
  )
{
  OPAL_SESSION                    Session;
  OPAL_DISK_SUPPORT_ATTRIBUTE     SupportedAttributes;
  TCG_LOCKING_FEATURE_DESCRIPTOR  LockingFeature;
  UINT16                          OpalBaseComId;
  TCG_RESULT                      Ret;

  Session.Sscp    = &OpalDev->Sscp;
  Session.MediaId = 0;

  Ret = OpalGetSupportedAttributesInfo (&Session, &SupportedAttributes, &OpalBaseComId);
  if (Ret != TcgResultSuccess) {
    return FALSE;
  }

  Session.OpalBaseComId = OpalBaseComId;
  *BlockSidSupported    = SupportedAttributes.BlockSid == 1 ? TRUE : FALSE;

  Ret = OpalGetLockingInfo (&Session, &LockingFeature);
  if (Ret != TcgResultSuccess) {
    return FALSE;
  }

  return OpalDeviceLocked (&SupportedAttributes, &LockingFeature);
}

/**
  Unlock OPAL password for S3.

  @param[in] OpalDev            Opal object to unlock.

**/
VOID
UnlockOpalPassword (
  IN OPAL_PEI_DEVICE  *OpalDev
  )
{
  TCG_RESULT    Result;
  OPAL_SESSION  Session;
  BOOLEAN       BlockSidSupport;
  UINT32        PpStorageFlags;
  BOOLEAN       BlockSIDEnabled;

  BlockSidSupport = FALSE;
  if (IsOpalDeviceLocked (OpalDev, &BlockSidSupport)) {
    ZeroMem (&Session, sizeof (Session));
    Session.Sscp          = &OpalDev->Sscp;
    Session.MediaId       = 0;
    Session.OpalBaseComId = OpalDev->Device->OpalBaseComId;

    Result = OpalUtilUpdateGlobalLockingRange (
               &Session,
               OpalDev->Device->Password,
               OpalDev->Device->PasswordLength,
               FALSE,
               FALSE
               );
    DEBUG ((
      DEBUG_INFO,
      "%a() OpalUtilUpdateGlobalLockingRange() Result = 0x%x\n",
      __func__,
      Result
      ));
  }

  PpStorageFlags = Tcg2PhysicalPresenceLibGetManagementFlags ();
  if ((PpStorageFlags & TCG2_BIOS_STORAGE_MANAGEMENT_FLAG_ENABLE_BLOCK_SID) != 0) {
    BlockSIDEnabled = TRUE;
  } else {
    BlockSIDEnabled = FALSE;
  }

  if (BlockSIDEnabled && BlockSidSupport) {
    DEBUG ((DEBUG_INFO, "OpalPassword: S3 phase send BlockSid command to device!\n"));
    ZeroMem (&Session, sizeof (Session));
    Session.Sscp          = &OpalDev->Sscp;
    Session.MediaId       = 0;
    Session.OpalBaseComId = OpalDev->Device->OpalBaseComId;
    Result                = OpalBlockSid (&Session, TRUE);
    DEBUG ((
      DEBUG_INFO,
      "%a() OpalBlockSid() Result = 0x%x\n",
      __func__,
      Result
      ));
  }
}

/**
  Unlock the OPAL NVM Express and ATA devices for S3.

  @param[in] SscPpi    Pointer to the EDKII_PEI_STORAGE_SECURITY_CMD_PPI instance.

**/
VOID
UnlockOpalPasswordDevices (
  IN EDKII_PEI_STORAGE_SECURITY_CMD_PPI  *SscPpi
  )
{
  EFI_STATUS                Status;
  UINT8                     *DevInfoBuffer;
  UINT8                     DummyData;
  OPAL_DEVICE_LOCKBOX_DATA  *DevInfo;
  UINTN                     DevInfoLength;
  EFI_DEVICE_PATH_PROTOCOL  *SscDevicePath;
  UINTN                     SscDevicePathLength;
  UINTN                     SscDeviceNum;
  UINTN                     SscDeviceIndex;
  OPAL_PEI_DEVICE           OpalDev;

  //
  // Get OPAL devices info from LockBox.
  //
  DevInfoBuffer = &DummyData;
  DevInfoLength = sizeof (DummyData);
  Status        = RestoreLockBox (&mOpalDeviceLockBoxGuid, DevInfoBuffer, &DevInfoLength);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    DevInfoBuffer = AllocatePages (EFI_SIZE_TO_PAGES (DevInfoLength));
    if (DevInfoBuffer != NULL) {
      Status = RestoreLockBox (&mOpalDeviceLockBoxGuid, DevInfoBuffer, &DevInfoLength);
    }
  }

  if ((DevInfoBuffer == NULL) || (DevInfoBuffer == &DummyData)) {
    return;
  } else if (EFI_ERROR (Status)) {
    FreePages (DevInfoBuffer, EFI_SIZE_TO_PAGES (DevInfoLength));
    return;
  }

  //
  // Go through all the devices managed by the SSC PPI instance.
  //
  Status = SscPpi->GetNumberofDevices (SscPpi, &SscDeviceNum);
  if (EFI_ERROR (Status)) {
    goto Exit;
  }

  for (SscDeviceIndex = 1; SscDeviceIndex <= SscDeviceNum; SscDeviceIndex++) {
    Status = SscPpi->GetDevicePath (
                       SscPpi,
                       SscDeviceIndex,
                       &SscDevicePathLength,
                       &SscDevicePath
                       );
    if (SscDevicePathLength <= sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
      //
      // Device path validity check.
      //
      continue;
    }

    //
    // Search the device in the restored LockBox.
    //
    for (DevInfo = (OPAL_DEVICE_LOCKBOX_DATA *)DevInfoBuffer;
         (UINTN)DevInfo < ((UINTN)DevInfoBuffer + DevInfoLength);
         DevInfo = (OPAL_DEVICE_LOCKBOX_DATA *)((UINTN)DevInfo + DevInfo->Length))
    {
      //
      // Find the matching device.
      //
      if ((DevInfo->DevicePathLength >= SscDevicePathLength) &&
          (CompareMem (
             DevInfo->DevicePath,
             SscDevicePath,
             SscDevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)
             ) == 0))
      {
        OpalDev.Signature        = OPAL_PEI_DEVICE_SIGNATURE;
        OpalDev.Sscp.ReceiveData = SecurityReceiveData;
        OpalDev.Sscp.SendData    = SecuritySendData;
        OpalDev.Device           = DevInfo;
        OpalDev.Context          = NULL;
        OpalDev.SscPpi           = SscPpi;
        OpalDev.DeviceIndex      = SscDeviceIndex;
        UnlockOpalPassword (&OpalDev);
        break;
      }
    }
  }

Exit:
  ZeroMem (DevInfoBuffer, DevInfoLength);
  FreePages (DevInfoBuffer, EFI_SIZE_TO_PAGES (DevInfoLength));
}

/**
  One notified function at the installation of EDKII_PEI_STORAGE_SECURITY_CMD_PPI.
  It is to unlock OPAL password for S3.

  @param[in] PeiServices         Indirect reference to the PEI Services Table.
  @param[in] NotifyDescriptor    Address of the notification descriptor data structure.
  @param[in] Ppi                 Address of the PPI that was installed.

  @return Status of the notification.
          The status code returned from this function is ignored.

**/
EFI_STATUS
EFIAPI
OpalPasswordStorageSecurityPpiNotify (
  IN EFI_PEI_SERVICES           **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc,
  IN VOID                       *Ppi
  )
{
  DEBUG ((DEBUG_INFO, "%a entered at S3 resume!\n", __func__));

  UnlockOpalPasswordDevices ((EDKII_PEI_STORAGE_SECURITY_CMD_PPI *)Ppi);

  DEBUG ((DEBUG_INFO, "%a exit at S3 resume!\n", __func__));

  return EFI_SUCCESS;
}

EFI_PEI_NOTIFY_DESCRIPTOR  mOpalPasswordStorageSecurityPpiNotifyDesc = {
  (EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gEdkiiPeiStorageSecurityCommandPpiGuid,
  OpalPasswordStorageSecurityPpiNotify
};

/**
  Main entry for this module.

  @param FileHandle             Handle of the file being invoked.
  @param PeiServices            Pointer to PEI Services table.

  @return Status from PeiServicesNotifyPpi.

**/
EFI_STATUS
EFIAPI
OpalPasswordPeiInit (
  IN EFI_PEI_FILE_HANDLE     FileHandle,
  IN CONST EFI_PEI_SERVICES  **PeiServices
  )
{
  EFI_STATUS     Status;
  EFI_BOOT_MODE  BootMode;

  Status = PeiServicesGetBootMode (&BootMode);
  if ((EFI_ERROR (Status)) || (BootMode != BOOT_ON_S3_RESUME)) {
    return EFI_UNSUPPORTED;
  }

  DEBUG ((DEBUG_INFO, "%a: Enters in S3 path.\n", __func__));

  Status = PeiServicesNotifyPpi (&mOpalPasswordStorageSecurityPpiNotifyDesc);
  ASSERT_EFI_ERROR (Status);
  return Status;
}