path: root/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c

/** @file
  HII Config Access protocol implementation of SecureBoot configuration module.

Copyright (c) 2011, 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
which 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 "SecureBootConfigImpl.h"

CHAR16                          mSecureBootStorageName[] = L"SECUREBOOT_CONFIGURATION";

SECUREBOOT_CONFIG_PRIVATE_DATA         mSecureBootConfigPrivateDateTemplate = {
  SECUREBOOT_CONFIG_PRIVATE_DATA_SIGNATURE,
  {
    SecureBootExtractConfig,
    SecureBootRouteConfig,
    SecureBootCallback
  }
};

HII_VENDOR_DEVICE_PATH          mSecureBootHiiVendorDevicePath = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_VENDOR_DP,
      {
        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
      }
    },
    SECUREBOOT_CONFIG_FORM_SET_GUID
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    {
      (UINT8) (END_DEVICE_PATH_LENGTH),
      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
    }
  }
};

/**
  Save Secure Boot option to variable space.

  @param[in] VarValue              The option of Secure Boot.

  @retval    EFI_SUCCESS           The operation is finished successfully.
  @retval    Others                Other errors as indicated.

**/
EFI_STATUS
SaveSecureBootVariable (
  IN UINT8                         VarValue
  )
{
  EFI_STATUS                       Status;

  Status = gRT->SetVariable (
             EFI_SECURE_BOOT_ENABLE_NAME,
             &gEfiSecureBootEnableDisableGuid,
             EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,
             sizeof (UINT8),
             &VarValue
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }
  gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
  return EFI_SUCCESS;
}

/**
  This function allows a caller to extract the current configuration for one
  or more named elements from the target driver.

  @param[in]   This              Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]   Request           A null-terminated Unicode string in
                                 <ConfigRequest> format.
  @param[out]  Progress          On return, points to a character in the Request
                                 string. Points to the string's null terminator if
                                 request was successful. Points to the most recent
                                 '&' before the first failing name/value pair (or
                                 the beginning of the string if the failure is in
                                 the first name/value pair) if the request was not
                                 successful.
  @param[out]  Results           A null-terminated Unicode string in
                                 <ConfigAltResp> format which has all values filled
                                 in for the names in the Request string. String to
                                 be allocated by the called function.

  @retval EFI_SUCCESS            The Results is filled with the requested values.
  @retval EFI_OUT_OF_RESOURCES   Not enough memory to store the results.
  @retval EFI_INVALID_PARAMETER  Request is illegal syntax, or unknown name.
  @retval EFI_NOT_FOUND          Routing data doesn't match any storage in this
                                 driver.

**/
EFI_STATUS
EFIAPI
SecureBootExtractConfig (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL        *This,
  IN CONST EFI_STRING                            Request,
       OUT EFI_STRING                            *Progress,
       OUT EFI_STRING                            *Results
  )
{
  EFI_STATUS                        Status;
  UINTN                             BufferSize;
  UINTN                             Size;
  SECUREBOOT_CONFIGURATION          Configuration;

  EFI_STRING                        ConfigRequest;
  EFI_STRING                        ConfigRequestHdr;
  UINT8                             *SecureBootEnable;
  SECUREBOOT_CONFIG_PRIVATE_DATA    *PrivateData;
  BOOLEAN                           AllocatedRequest;

  if (Progress == NULL || Results == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  AllocatedRequest = FALSE;
  ConfigRequestHdr = NULL;
  ConfigRequest    = NULL;
  Size             = 0;
  
  ZeroMem (&Configuration, sizeof (Configuration));
  PrivateData      = SECUREBOOT_CONFIG_PRIVATE_FROM_THIS (This);
  *Progress        = Request;
  
  if ((Request != NULL) && !HiiIsConfigHdrMatch (Request, &gSecureBootConfigFormSetGuid, mSecureBootStorageName)) {
    return EFI_NOT_FOUND;
  }

  
  //
  // Get the SecureBoot Variable
  //
  SecureBootEnable = GetVariable (EFI_SECURE_BOOT_ENABLE_NAME, &gEfiSecureBootEnableDisableGuid);

  //
  // If the SecureBoot Variable doesn't exist, hide the SecureBoot Enable/Disable
  // Checkbox.
  //
  if (SecureBootEnable == NULL) {
    Configuration.HideSecureBoot = TRUE;
  } else {
    Configuration.HideSecureBoot = FALSE;
    Configuration.SecureBootState = *SecureBootEnable;
  }
  
  BufferSize = sizeof (SECUREBOOT_CONFIGURATION);
  ConfigRequest = Request;
  if ((Request == NULL) || (StrStr (Request, L"OFFSET") == NULL)) {
    //
    // Request is set to NULL or OFFSET is NULL, construct full request string.
    //

    //
    // Allocate and fill a buffer large enough to hold the <ConfigHdr> template
    // followed by "&OFFSET=0&WIDTH=WWWWWWWWWWWWWWWW" followed by a Null-terminator
    //
    ConfigRequestHdr = HiiConstructConfigHdr (&gSecureBootConfigFormSetGuid, mSecureBootStorageName, PrivateData->DriverHandle);
    Size = (StrLen (ConfigRequestHdr) + 32 + 1) * sizeof (CHAR16);
    ConfigRequest = AllocateZeroPool (Size);
    ASSERT (ConfigRequest != NULL);
    AllocatedRequest = TRUE;
    UnicodeSPrint (ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, (UINT64)BufferSize);
    FreePool (ConfigRequestHdr);
    ConfigRequestHdr = NULL;
  }

  Status = gHiiConfigRouting->BlockToConfig (
                                gHiiConfigRouting,
                                ConfigRequest,
                                (UINT8 *) &Configuration,
                                BufferSize,
                                Results,
                                Progress
                                );

  //
  // Free the allocated config request string.
  //
  if (AllocatedRequest) {
    FreePool (ConfigRequest);
  }

  //
  // Set Progress string to the original request string.
  //
  if (Request == NULL) {
    *Progress = NULL;
  } else if (StrStr (Request, L"OFFSET") == NULL) {
    *Progress = Request + StrLen (Request);
  }

  return Status;
}

/**
  This function processes the results of changes in configuration.

  @param[in]  This               Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]  Configuration      A null-terminated Unicode string in <ConfigResp>
                                 format.
  @param[out] Progress           A pointer to a string filled in with the offset of
                                 the most recent '&' before the first failing
                                 name/value pair (or the beginning of the string if
                                 the failure is in the first name/value pair) or
                                 the terminating NULL if all was successful.

  @retval EFI_SUCCESS            The Results is processed successfully.
  @retval EFI_INVALID_PARAMETER  Configuration is NULL.
  @retval EFI_NOT_FOUND          Routing data doesn't match any storage in this
                                 driver.

**/
EFI_STATUS
EFIAPI
SecureBootRouteConfig (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL      *This,
  IN CONST EFI_STRING                          Configuration,
       OUT EFI_STRING                          *Progress
  )
{
  EFI_STATUS                       Status;
  UINTN                            BufferSize;
  SECUREBOOT_CONFIGURATION         SecureBootConfiguration;
  UINT8                            *SecureBootEnable;


  if (Configuration == NULL || Progress == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  *Progress = Configuration;
  if (!HiiIsConfigHdrMatch (Configuration, &gSecureBootConfigFormSetGuid, mSecureBootStorageName)) {
    return EFI_NOT_FOUND;
  }

  //
  // Convert <ConfigResp> to buffer data by helper function ConfigToBlock()
  //
  BufferSize = sizeof (SECUREBOOT_CONFIGURATION);
  Status = gHiiConfigRouting->ConfigToBlock (
                                gHiiConfigRouting,
                                Configuration,
                                (UINT8 *) &SecureBootConfiguration,
                                &BufferSize,
                                Progress
                                );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  SecureBootEnable = GetVariable (EFI_SECURE_BOOT_ENABLE_NAME, &gEfiSecureBootEnableDisableGuid);
  if (SecureBootEnable == NULL) {
    return EFI_SUCCESS;
  }

  if ((*SecureBootEnable) != SecureBootConfiguration.SecureBootState) {
    //
    // If the configure is changed, update the SecureBoot Variable.
    //
    SaveSecureBootVariable (SecureBootConfiguration.SecureBootState);
  }
  return EFI_SUCCESS;
}

/**
  This function processes the results of changes in configuration.

  @param[in]  This               Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]  Action             Specifies the type of action taken by the browser.
  @param[in]  QuestionId         A unique value which is sent to the original
                                 exporting driver so that it can identify the type
                                 of data to expect.
  @param[in]  Type               The type of value for the question.
  @param[in]  Value              A pointer to the data being sent to the original
                                 exporting driver.
  @param[out] ActionRequest      On return, points to the action requested by the
                                 callback function.

  @retval EFI_SUCCESS            The callback successfully handled the action.
  @retval EFI_OUT_OF_RESOURCES   Not enough storage is available to hold the
                                 variable and its data.
  @retval EFI_DEVICE_ERROR       The variable could not be saved.
  @retval EFI_UNSUPPORTED        The specified Action is not supported by the
                                 callback.

**/
EFI_STATUS
EFIAPI
SecureBootCallback (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL      *This,
  IN     EFI_BROWSER_ACTION                    Action,
  IN     EFI_QUESTION_ID                       QuestionId,
  IN     UINT8                                 Type,
  IN     EFI_IFR_TYPE_VALUE                    *Value,
     OUT EFI_BROWSER_ACTION_REQUEST            *ActionRequest
  )
{
  BOOLEAN           SecureBootEnable;

  if ((This == NULL) || (Value == NULL) || (ActionRequest == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  if ((Action != EFI_BROWSER_ACTION_CHANGED) || (QuestionId != KEY_SECURE_BOOT_ENABLE)) {
    return EFI_UNSUPPORTED;
  }

  if (NULL == GetVariable (EFI_SECURE_BOOT_ENABLE_NAME, &gEfiSecureBootEnableDisableGuid)) {
    return EFI_SUCCESS;
  }

  SecureBootEnable = Value->u8;
  SaveSecureBootVariable (Value->u8);
  return EFI_SUCCESS;

}

/**
  This function publish the SecureBoot configuration Form.

  @param[in, out]  PrivateData   Points to SecureBoot configuration private data.

  @retval EFI_SUCCESS            HII Form is installed for this network device.
  @retval EFI_OUT_OF_RESOURCES   Not enough resource for HII Form installation.
  @retval Others                 Other errors as indicated.

**/
EFI_STATUS
InstallSecureBootConfigForm (
  IN OUT SECUREBOOT_CONFIG_PRIVATE_DATA  *PrivateData
  )
{
  EFI_STATUS                      Status;
  EFI_HII_HANDLE                  HiiHandle;
  EFI_HANDLE                      DriverHandle;

  EFI_HII_CONFIG_ACCESS_PROTOCOL  *ConfigAccess;

  DriverHandle = NULL;
  ConfigAccess = &PrivateData->ConfigAccess;
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &DriverHandle,
                  &gEfiDevicePathProtocolGuid,
                  &mSecureBootHiiVendorDevicePath,
                  &gEfiHiiConfigAccessProtocolGuid,
                  ConfigAccess,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  PrivateData->DriverHandle = DriverHandle;

  //
  // Publish the HII package list
  //
  HiiHandle = HiiAddPackages (
                &gSecureBootConfigFormSetGuid,
                DriverHandle,
                SecureBootConfigDxeStrings,
                SecureBootConfigBin,
                NULL
                );
  if (HiiHandle == NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           DriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mSecureBootHiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           ConfigAccess,
           NULL
           );

    return EFI_OUT_OF_RESOURCES;
  }

  PrivateData->HiiHandle = HiiHandle;
  return EFI_SUCCESS;
}

/**
  This function removes SecureBoot configuration Form.

  @param[in, out]  PrivateData   Points to SecureBoot configuration private data.

**/
VOID
UninstallSecureBootConfigForm (
  IN OUT SECUREBOOT_CONFIG_PRIVATE_DATA    *PrivateData
  )
{
  //
  // Uninstall HII package list
  //
  if (PrivateData->HiiHandle != NULL) {
    HiiRemovePackages (PrivateData->HiiHandle);
    PrivateData->HiiHandle = NULL;
  }

  //
  // Uninstall HII Config Access Protocol
  //
  if (PrivateData->DriverHandle != NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           PrivateData->DriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mSecureBootHiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           &PrivateData->ConfigAccess,
           NULL
           );
    PrivateData->DriverHandle = NULL;
  }

  FreePool (PrivateData);
}