/** @file
The internal header file includes the common header files, defines
internal structure and functions used by AuthService module.
Caution: This module requires additional review when modified.
This driver will have external input - variable data. It may be input in SMM mode.
This external input must be validated carefully to avoid security issue like
buffer overflow, integer overflow.
Variable attribute should also be checked to avoid authentication bypass.
The whole SMM authentication variable design relies on the integrity of flash part and SMM.
which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory
may not be modified without authorization. If platform fails to protect these resources,
the authentication service provided in this driver will be broken, and the behavior is undefined.
Copyright (c) 2009 - 2016, 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.
**/
#ifndef _AUTHSERVICE_INTERNAL_H_
#define _AUTHSERVICE_INTERNAL_H_
#include <Library/AuthVariableLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseCryptLib.h>
#include <Library/PlatformSecureLib.h>
#include <Guid/AuthenticatedVariableFormat.h>
#include <Guid/ImageAuthentication.h>
///
/// Struct to record signature requirement defined by UEFI spec.
/// For SigHeaderSize and SigDataSize, ((UINT32) ~0) means NO exact length requirement for this field.
///
typedef struct {
EFI_GUID SigType;
// Expected SignatureHeader size in Bytes.
UINT32 SigHeaderSize;
// Expected SignatureData size in Bytes.
UINT32 SigDataSize;
} EFI_SIGNATURE_ITEM;
typedef enum {
AuthVarTypePk,
AuthVarTypeKek,
AuthVarTypePriv,
AuthVarTypePayload
} AUTHVAR_TYPE;
///
/// "AuthVarKeyDatabase" variable for the Public Key store
/// of variables with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
///
/// GUID: gEfiAuthenticatedVariableGuid
///
/// We need maintain atomicity.
///
/// Format:
/// +----------------------------+
/// | AUTHVAR_KEY_DB_DATA | <-- First AuthVarKey
/// +----------------------------+
/// | ...... |
/// +----------------------------+
/// | AUTHVAR_KEY_DB_DATA | <-- Last AuthKey
/// +----------------------------+
///
#define AUTHVAR_KEYDB_NAME L"AuthVarKeyDatabase"
#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256
#define EFI_CERT_TYPE_RSA2048_SIZE 256
#pragma pack(1)
typedef struct {
UINT32 KeyIndex;
UINT8 KeyData[EFI_CERT_TYPE_RSA2048_SIZE];
} AUTHVAR_KEY_DB_DATA;
#pragma pack()
///
/// "certdb" variable stores the signer's certificates for non PK/KEK/DB/DBX
/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS|EFI_VARIABLE_NON_VOLATILE set.
/// "certdbv" variable stores the signer's certificates for non PK/KEK/DB/DBX
/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
///
/// GUID: gEfiCertDbGuid
///
/// We need maintain atomicity.
///
/// Format:
/// +----------------------------+
/// | UINT32 | <-- CertDbListSize, including this UINT32
/// +----------------------------+
/// | AUTH_CERT_DB_DATA | <-- First CERT
/// +----------------------------+
/// | ........ |
/// +----------------------------+
/// | AUTH_CERT_DB_DATA | <-- Last CERT
/// +----------------------------+
///
#define EFI_CERT_DB_NAME L"certdb"
#define EFI_CERT_DB_VOLATILE_NAME L"certdbv"
#pragma pack(1)
typedef struct {
EFI_GUID VendorGuid;
UINT32 CertNodeSize;
UINT32 NameSize;
UINT32 CertDataSize;
/// CHAR16 VariableName[NameSize];
/// UINT8 CertData[CertDataSize];
} AUTH_CERT_DB_DATA;
#pragma pack()
extern UINT8 *mPubKeyStore;
extern UINT32 mPubKeyNumber;
extern UINT32 mMaxKeyNumber;
extern UINT32 mMaxKeyDbSize;
extern UINT8 *mCertDbStore;
extern UINT32 mMaxCertDbSize;
extern UINT32 mPlatformMode;
extern UINT8 mVendorKeyState;
extern VOID *mHashCtx;
extern AUTH_VAR_LIB_CONTEXT_IN *mAuthVarLibContextIn;
/**
Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize and data are external input.
This function will do basic validation, before parse the data.
This function will parse the authentication carefully to avoid security issues, like
buffer overflow, integer overflow.
@param[in] VariableName Name of Variable to be found.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param[in] Attributes Attribute value of the variable.
@param[in] AuthVarType Verify against PK, KEK database, private database or certificate in data payload.
@param[out] VarDel Delete the variable or not.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_SECURITY_VIOLATION The variable does NOT pass the validation
check carried out by the firmware.
@retval EFI_OUT_OF_RESOURCES Failed to process variable due to lack
of resources.
@retval EFI_SUCCESS Variable pass validation successfully.
**/
EFI_STATUS
VerifyTimeBasedPayloadAndUpdate (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes,
IN AUTHVAR_TYPE AuthVarType,
OUT BOOLEAN *VarDel
);
/**
Delete matching signer's certificates when deleting common authenticated
variable by corresponding VariableName and VendorGuid from "certdb" or
"certdbv" according to authenticated variable attributes.
@param[in] VariableName Name of authenticated Variable.
@param[in] VendorGuid Vendor GUID of authenticated Variable.
@param[in] Attributes Attributes of authenticated variable.
@retval EFI_INVALID_PARAMETER Any input parameter is invalid.
@retval EFI_NOT_FOUND Fail to find "certdb"/"certdbv" or matching certs.
@retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.
@retval EFI_SUCCESS The operation is completed successfully.
**/
EFI_STATUS
DeleteCertsFromDb (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes
);
/**
Clean up signer's certificates for common authenticated variable
by corresponding VariableName and VendorGuid from "certdb".
Sytem may break down during Timebased Variable update & certdb update,
make them inconsistent, this function is called in AuthVariable Init to ensure
consistency
@retval EFI_NOT_FOUND Fail to find matching certs.
@retval EFI_SUCCESS Find matching certs and output parameters.
**/
EFI_STATUS
CleanCertsFromDb (
VOID
);
/**
Filter out the duplicated EFI_SIGNATURE_DATA from the new data by comparing to the original data.
@param[in] Data Pointer to original EFI_SIGNATURE_LIST.
@param[in] DataSize Size of Data buffer.
@param[in, out] NewData Pointer to new EFI_SIGNATURE_LIST.
@param[in, out] NewDataSize Size of NewData buffer.
**/
EFI_STATUS
FilterSignatureList (
IN VOID *Data,
IN UINTN DataSize,
IN OUT VOID *NewData,
IN OUT UINTN *NewDataSize
);
/**
Process variable with platform key for verification.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize and data are external input.
This function will do basic validation, before parse the data.
This function will parse the authentication carefully to avoid security issues, like
buffer overflow, integer overflow.
This function will check attribute carefully to avoid authentication bypass.
@param[in] VariableName Name of Variable to be found.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param[in] Attributes Attribute value of the variable
@param[in] IsPk Indicate whether it is to process pk.
@return EFI_INVALID_PARAMETER Invalid parameter.
@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation.
check carried out by the firmware.
@return EFI_SUCCESS Variable passed validation successfully.
**/
EFI_STATUS
ProcessVarWithPk (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes OPTIONAL,
IN BOOLEAN IsPk
);
/**
Process variable with key exchange key for verification.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize and data are external input.
This function will do basic validation, before parse the data.
This function will parse the authentication carefully to avoid security issues, like
buffer overflow, integer overflow.
This function will check attribute carefully to avoid authentication bypass.
@param[in] VariableName Name of Variable to be found.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param[in] Attributes Attribute value of the variable.
@return EFI_INVALID_PARAMETER Invalid parameter.
@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation
check carried out by the firmware.
@return EFI_SUCCESS Variable pass validation successfully.
**/
EFI_STATUS
ProcessVarWithKek (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes OPTIONAL
);
/**
Process variable with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS/EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize and data are external input.
This function will do basic validation, before parse the data.
This function will parse the authentication carefully to avoid security issues, like
buffer overflow, integer overflow.
This function will check attribute carefully to avoid authentication bypass.
@param[in] VariableName Name of the variable.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data.
@param[in] Attributes Attribute value of the variable.
@return EFI_INVALID_PARAMETER Invalid parameter.
@return EFI_WRITE_PROTECTED Variable is write-protected and needs authentication with
EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
@return EFI_OUT_OF_RESOURCES The Database to save the public key is full.
@return EFI_SECURITY_VIOLATION The variable is with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
set, but the AuthInfo does NOT pass the validation
check carried out by the firmware.
@return EFI_SUCCESS Variable is not write-protected or pass validation successfully.
**/
EFI_STATUS
ProcessVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes
);
/**
Finds variable in storage blocks of volatile and non-volatile storage areas.
This code finds variable in storage blocks of volatile and non-volatile storage areas.
If VariableName is an empty string, then we just return the first
qualified variable without comparing VariableName and VendorGuid.
@param[in] VariableName Name of the variable to be found.
@param[in] VendorGuid Variable vendor GUID to be found.
@param[out] Data Pointer to data address.
@param[out] DataSize Pointer to data size.
@retval EFI_INVALID_PARAMETER If VariableName is not an empty string,
while VendorGuid is NULL.
@retval EFI_SUCCESS Variable successfully found.
@retval EFI_NOT_FOUND Variable not found
**/
EFI_STATUS
AuthServiceInternalFindVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT VOID **Data,
OUT UINTN *DataSize
);
/**
Update the variable region with Variable information.
@param[in] VariableName Name of variable.
@param[in] VendorGuid Guid of variable.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data.
@param[in] Attributes Attribute value of the variable.
@retval EFI_SUCCESS The update operation is success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_WRITE_PROTECTED Variable is write-protected.
@retval EFI_OUT_OF_RESOURCES There is not enough resource.
**/
EFI_STATUS
AuthServiceInternalUpdateVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes
);
/**
Update the variable region with Variable information.
@param[in] VariableName Name of variable.
@param[in] VendorGuid Guid of variable.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data.
@param[in] Attributes Attribute value of the variable.
@param[in] KeyIndex Index of associated public key.
@param[in] MonotonicCount Value of associated monotonic count.
@retval EFI_SUCCESS The update operation is success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_WRITE_PROTECTED Variable is write-protected.
@retval EFI_OUT_OF_RESOURCES There is not enough resource.
**/
EFI_STATUS
AuthServiceInternalUpdateVariableWithMonotonicCount (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes,
IN UINT32 KeyIndex,
IN UINT64 MonotonicCount
);
/**
Update the variable region with Variable information.
@param[in] VariableName Name of variable.
@param[in] VendorGuid Guid of variable.
@param[in] Data Data pointer.
@param[in] DataSize Size of Data.
@param[in] Attributes Attribute value of the variable.
@param[in] TimeStamp Value of associated TimeStamp.
@retval EFI_SUCCESS The update operation is success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_WRITE_PROTECTED Variable is write-protected.
@retval EFI_OUT_OF_RESOURCES There is not enough resource.
**/
EFI_STATUS
AuthServiceInternalUpdateVariableWithTimeStamp (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes,
IN EFI_TIME *TimeStamp
);
#endif