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/** @file
Implements CRC32 guided section handler to parse CRC32 encapsulation section,
extract data and authenticate 32 bit CRC value.
Copyright (c) 2007 - 2008, 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 <PiDxe.h>
#include <Protocol/Crc32GuidedSectionExtraction.h>
#include <Protocol/SecurityPolicy.h>
#include <Library/ExtractGuidedSectionLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#define EFI_SECITON_SIZE_MASK 0x00ffffff
typedef struct {
EFI_GUID_DEFINED_SECTION GuidedSectionHeader;
UINT32 CRC32Checksum;
} CRC32_SECTION_HEADER;
/**
The implementation of Crc32 guided section GetInfo() to get
size and attribute of the guided section.
@param InputSection Buffer containing the input GUIDed section to be processed.
@param OutputBufferSize The size of OutputBuffer.
@param ScratchBufferSize The size of ScratchBuffer.
@param SectionAttribute The attribute of the input guided section.
@retval EFI_SUCCESS The size of destination buffer, the size of scratch buffer and
the attribute of the input section are successull retrieved.
@retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.
**/
EFI_STATUS
EFIAPI
Crc32GuidedSectionGetInfo (
IN CONST VOID *InputSection,
OUT UINT32 *OutputBufferSize,
OUT UINT32 *ScratchBufferSize,
OUT UINT16 *SectionAttribute
)
{
//
// Check whether the input guid section is recognized.
//
if (!CompareGuid (
&gEfiCrc32GuidedSectionExtractionProtocolGuid,
&(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {
return EFI_INVALID_PARAMETER;
}
//
// Retrieve the size and attribute of the input section data.
//
*SectionAttribute = ((EFI_GUID_DEFINED_SECTION *) InputSection)->Attributes;
*ScratchBufferSize = 0;
*OutputBufferSize = *(UINT32 *) (((EFI_COMMON_SECTION_HEADER *) InputSection)->Size) & EFI_SECITON_SIZE_MASK;
*OutputBufferSize -= ((EFI_GUID_DEFINED_SECTION *) InputSection)->DataOffset;
return EFI_SUCCESS;
}
/**
The implementation of Crc32 Guided section extraction to get the section data.
@param InputSection Buffer containing the input GUIDed section to be processed.
@param OutputBuffer to contain the output data, which is allocated by the caller.
@param ScratchBuffer A pointer to a caller-allocated buffer for function internal use.
@param AuthenticationStatus A pointer to a caller-allocated UINT32 that indicates the
authentication status of the output buffer.
@retval EFI_SUCCESS Section Data and Auth Status is extracted successfully.
@retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.
**/
EFI_STATUS
EFIAPI
Crc32GuidedSectionHandler (
IN CONST VOID *InputSection,
OUT VOID **OutputBuffer,
IN VOID *ScratchBuffer, OPTIONAL
OUT UINT32 *AuthenticationStatus
)
{
EFI_STATUS Status;
CRC32_SECTION_HEADER *Crc32SectionHeader;
UINT32 Crc32Checksum;
UINT32 OutputBufferSize;
VOID *DummyInterface;
//
// Check whether the input guid section is recognized.
//
if (!CompareGuid (
&gEfiCrc32GuidedSectionExtractionProtocolGuid,
&(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {
return EFI_INVALID_PARAMETER;
}
//
// Init Checksum value to Zero.
//
Crc32Checksum = 0;
//
// Points to the Crc32 section header
//
Crc32SectionHeader = (CRC32_SECTION_HEADER *) InputSection;
*OutputBuffer = (UINT8 *) InputSection + Crc32SectionHeader->GuidedSectionHeader.DataOffset;
OutputBufferSize = *(UINT32 *) (((EFI_COMMON_SECTION_HEADER *) InputSection)->Size) & EFI_SECITON_SIZE_MASK;
OutputBufferSize -= Crc32SectionHeader->GuidedSectionHeader.DataOffset;
//
// Implictly CRC32 GUIDed section should have STATUS_VALID bit set
//
ASSERT (Crc32SectionHeader->GuidedSectionHeader.Attributes & EFI_GUIDED_SECTION_AUTH_STATUS_VALID);
*AuthenticationStatus = EFI_AUTH_STATUS_IMAGE_SIGNED;
//
// Check whether there exists EFI_SECURITY_POLICY_PROTOCOL_GUID.
//
Status = gBS->LocateProtocol (&gEfiSecurityPolicyProtocolGuid, NULL, &DummyInterface);
if (!EFI_ERROR (Status)) {
//
// If SecurityPolicy Protocol exist, AUTH platform override bit is set.
//
*AuthenticationStatus |= EFI_AUTH_STATUS_PLATFORM_OVERRIDE;
} else {
//
// Calculate CRC32 Checksum of Image
//
Status = gBS->CalculateCrc32 (*OutputBuffer, OutputBufferSize, &Crc32Checksum);
if (Status == EFI_SUCCESS) {
if (Crc32Checksum != Crc32SectionHeader->CRC32Checksum) {
//
// If Crc32 checksum is not matched, AUTH tested failed bit is set.
//
*AuthenticationStatus |= EFI_AUTH_STATUS_TEST_FAILED;
}
} else {
//
// If Crc32 checksum is not calculated, AUTH not tested bit is set.
//
*AuthenticationStatus |= EFI_AUTH_STATUS_NOT_TESTED;
}
}
return EFI_SUCCESS;
}
/**
Register Crc32 section handler.
@retval RETURN_SUCCESS Register successfully.
@retval RETURN_OUT_OF_RESOURCES No enough memory to register this handler.
**/
EFI_STATUS
EFIAPI
DxeCrc32GuidedSectionExtractLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return ExtractGuidedSectionRegisterHandlers (
&gEfiCrc32GuidedSectionExtractionProtocolGuid,
Crc32GuidedSectionGetInfo,
Crc32GuidedSectionHandler
);
}
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