audk/MdeModulePkg/Core/Pei/Security/Security.c

/** @file
  EFI PEI Core Security services
  
Copyright (c) 2006, Intel Corporation                                                         
All rights reserved. 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 <PeiMain.h>

/**

  Provide a callback for when the security PPI is installed.

  @param PeiServices        An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param NotifyDescriptor   The descriptor for the notification event.
  @param Ppi                Pointer to the PPI in question.

  @return Always success

**/
EFI_STATUS
EFIAPI
SecurityPpiNotifyCallback (
  IN EFI_PEI_SERVICES           **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,
  IN VOID                       *Ppi
  );

STATIC EFI_PEI_NOTIFY_DESCRIPTOR mNotifyList = {
   EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
   &gEfiPeiSecurity2PpiGuid,
   SecurityPpiNotifyCallback
};

/**
  Initialize the security services.

  @param PeiServices     An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param OldCoreData     Pointer to the old core data.
                         NULL if being run in non-permament memory mode.

**/
VOID
InitializeSecurityServices (
  IN EFI_PEI_SERVICES  **PeiServices,
  IN PEI_CORE_INSTANCE *OldCoreData
  )
{
  if (OldCoreData == NULL) {
    PeiServicesNotifyPpi (&mNotifyList);
  }
  return;
}

/**

  Provide a callback for when the security PPI is installed.
  This routine will cache installed security PPI into PeiCore's private data.
  
  @param PeiServices        An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param NotifyDescriptor   The descriptor for the notification event.
  @param Ppi                Pointer to the PPI in question.

  @return Always success

**/
EFI_STATUS
EFIAPI
SecurityPpiNotifyCallback (
  IN EFI_PEI_SERVICES           **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,
  IN VOID                       *Ppi
  )
{
  PEI_CORE_INSTANCE                       *PrivateData;

  //
  // Get PEI Core private data
  //
  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS (PeiServices);
  
  //
  // If there isn't a security PPI installed, use the one from notification
  //
  if (PrivateData->PrivateSecurityPpi == NULL) {
    PrivateData->PrivateSecurityPpi = (EFI_PEI_SECURITY2_PPI *)Ppi;
  }
  return EFI_SUCCESS;
}

/**

  Provide a callout to the security verification service.


  @param PrivateData     PeiCore's private data structure
  @param VolumeHandle    Handle of FV
  @param FileHandle      Handle of PEIM's ffs

  @retval EFI_SUCCESS              Image is OK
  @retval EFI_SECURITY_VIOLATION   Image is illegal
  @retval EFI_NOT_FOUND            If security PPI is not installed.
**/
EFI_STATUS
VerifyPeim (
  IN PEI_CORE_INSTANCE      *PrivateData,
  IN EFI_PEI_FV_HANDLE      VolumeHandle,
  IN EFI_PEI_FILE_HANDLE    FileHandle
  )
{
  EFI_STATUS                      Status;
  UINT32                          AuthenticationStatus;
  BOOLEAN                         DeferExection;

  //
  // Set a default authentication state
  //
  AuthenticationStatus = 0;

  if (PrivateData->PrivateSecurityPpi == NULL) {
    Status = EFI_NOT_FOUND;
  } else {
    //
    // Check to see if the image is OK
    //
    Status = PrivateData->PrivateSecurityPpi->AuthenticationState (
                                                (CONST EFI_PEI_SERVICES **) &PrivateData->PS,
                                                PrivateData->PrivateSecurityPpi,
                                                AuthenticationStatus,
                                                VolumeHandle,
                                                FileHandle,
                                                &DeferExection
                                                );
    if (DeferExection) {
      Status = EFI_SECURITY_VIOLATION;
    }
  }
  return Status;
}


/**
  Verify a Firmware volume.

  @param CurrentFvAddress   Pointer to the current Firmware Volume under consideration

  @retval EFI_SUCCESS       Firmware Volume is legal

**/
EFI_STATUS
VerifyFv (
  IN EFI_FIRMWARE_VOLUME_HEADER  *CurrentFvAddress
  )
{
  //
  // Right now just pass the test.  Future can authenticate and/or check the
  // FV-header or other metric for goodness of binary.
  //
  return EFI_SUCCESS;
}