SecurityPkg/Library/PlatformSecureLibNull/PlatformSecureLibNull.c

   1 /** @file
   2   Provides a secure platform-specific method to detect physically present user.
   3
   4 Copyright (c) 2011 - 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 /**
  16
  17   This function provides a platform-specific method to detect whether the platform
  18   is operating by a physically present user.
  19
  20   Programmatic changing of platform security policy (such as disable Secure Boot,
  21   or switch between Standard/Custom Secure Boot mode) MUST NOT be possible during
  22   Boot Services or after exiting EFI Boot Services. Only a physically present user
  23   is allowed to perform these operations.
  24
  25   NOTE THAT: This function cannot depend on any EFI Variable Service since they are
  26   not available when this function is called in AuthenticateVariable driver.
  27
  28   @retval  TRUE       The platform is operated by a physically present user.
  29   @retval  FALSE      The platform is NOT operated by a physically present user.
  30
  31 **/
  32 BOOLEAN
  33 EFIAPI
  34 UserPhysicalPresent (
  35   VOID
  36   )
  37 {
  38   return TRUE;
  39 }