13af4ab065
1. If PcdMaxAuthVariableSize is set to 0, keep current behavior as is and PcdMaxVariableSize used. 2. If PcdMaxAuthVariableSize is set to non 0, it will work on authenticated variables. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17610 6f19259b-4bc3-4df7-8a09-765794883524
361 lines
15 KiB
C
361 lines
15 KiB
C
/** @file
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The internal header file includes the common header files, defines
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internal structure and functions used by AuthService module.
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Caution: This module requires additional review when modified.
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This driver will have external input - variable data. It may be input in SMM mode.
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This external input must be validated carefully to avoid security issue like
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buffer overflow, integer overflow.
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Variable attribute should also be checked to avoid authentication bypass.
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The whole SMM authentication variable design relies on the integrity of flash part and SMM.
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which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory
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may not be modified without authorization. If platform fails to protect these resources,
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the authentication service provided in this driver will be broken, and the behavior is undefined.
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Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _AUTHSERVICE_H_
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#define _AUTHSERVICE_H_
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#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256
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#define EFI_CERT_TYPE_RSA2048_SIZE 256
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///
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/// Size of AuthInfo prior to the data payload.
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///
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#define AUTHINFO_SIZE ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION, AuthInfo)) + \
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(OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) + \
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sizeof (EFI_CERT_BLOCK_RSA_2048_SHA256))
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#define AUTHINFO2_SIZE(VarAuth2) ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \
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(UINTN) ((EFI_VARIABLE_AUTHENTICATION_2 *) (VarAuth2))->AuthInfo.Hdr.dwLength)
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#define OFFSET_OF_AUTHINFO2_CERT_DATA ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \
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(OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)))
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///
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/// "AuthVarKeyDatabase" variable for the Public Key store.
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///
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#define AUTHVAR_KEYDB_NAME L"AuthVarKeyDatabase"
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///
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/// "certdb" variable stores the signer's certificates for non PK/KEK/DB/DBX
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/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.
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///
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///
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#define EFI_CERT_DB_NAME L"certdb"
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///
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/// Struct to record signature requirement defined by UEFI spec.
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/// For SigHeaderSize and SigDataSize, ((UINT32) ~0) means NO exact length requirement for this field.
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///
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typedef struct {
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EFI_GUID SigType;
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// Expected SignatureHeader size in Bytes.
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UINT32 SigHeaderSize;
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// Expected SignatureData size in Bytes.
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UINT32 SigDataSize;
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} EFI_SIGNATURE_ITEM;
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typedef enum {
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AuthVarTypePk,
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AuthVarTypeKek,
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AuthVarTypePriv,
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AuthVarTypePayload
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} AUTHVAR_TYPE;
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#pragma pack(1)
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typedef struct {
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EFI_GUID VendorGuid;
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UINT32 CertNodeSize;
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UINT32 NameSize;
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UINT32 CertDataSize;
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/// CHAR16 VariableName[NameSize];
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/// UINT8 CertData[CertDataSize];
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} AUTH_CERT_DB_DATA;
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#pragma pack()
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/**
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Process variable with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS/EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.
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Caution: This function may receive untrusted input.
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This function may be invoked in SMM mode, and datasize and data are external input.
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This function will do basic validation, before parse the data.
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This function will parse the authentication carefully to avoid security issues, like
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buffer overflow, integer overflow.
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This function will check attribute carefully to avoid authentication bypass.
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@param[in] VariableName Name of Variable to be found.
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@param[in] VendorGuid Variable vendor GUID.
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@param[in] Data Data pointer.
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@param[in] DataSize Size of Data found. If size is less than the
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data, this value contains the required size.
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@param[in] Variable The variable information which is used to keep track of variable usage.
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@param[in] Attributes Attribute value of the variable.
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@return EFI_INVALID_PARAMETER Invalid parameter
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@return EFI_WRITE_PROTECTED Variable is write-protected and needs authentication with
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EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
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@return EFI_SECURITY_VIOLATION The variable is with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
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set, but the AuthInfo does NOT pass the validation
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check carried out by the firmware.
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@return EFI_SUCCESS Variable is not write-protected, or passed validation successfully.
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**/
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EFI_STATUS
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ProcessVariable (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN VOID *Data,
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IN UINTN DataSize,
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IN VARIABLE_POINTER_TRACK *Variable,
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IN UINT32 Attributes
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);
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/**
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Update platform mode.
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@param[in] Mode SETUP_MODE or USER_MODE.
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@return EFI_INVALID_PARAMETER Invalid parameter.
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@return EFI_SUCCESS Update platform mode successfully.
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**/
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EFI_STATUS
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UpdatePlatformMode (
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IN UINT32 Mode
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);
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/**
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Initializes for authenticated varibale service.
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@param[in] MaxAuthVariableSize Reflect the overhead associated with the saving
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of a single EFI authenticated variable with the exception
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of the overhead associated with the length
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of the string name of the EFI variable.
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@retval EFI_SUCCESS Function successfully executed.
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@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resources.
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**/
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EFI_STATUS
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AutenticatedVariableServiceInitialize (
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IN UINTN MaxAuthVariableSize
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);
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/**
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Initializes for cryptlib service before use, include register algrithm and allocate scratch.
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**/
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VOID
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CryptLibraryInitialize (
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VOID
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);
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/**
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Check input data form to make sure it is a valid EFI_SIGNATURE_LIST for PK/KEK variable.
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@param[in] VariableName Name of Variable to be check.
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@param[in] VendorGuid Variable vendor GUID.
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@param[in] Data Point to the variable data to be checked.
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@param[in] DataSize Size of Data.
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@return EFI_INVALID_PARAMETER Invalid signature list format.
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@return EFI_SUCCESS Passed signature list format check successfully.
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**/
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EFI_STATUS
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CheckSignatureListFormat(
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN VOID *Data,
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IN UINTN DataSize
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);
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/**
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Process variable with platform key for verification.
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Caution: This function may receive untrusted input.
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This function may be invoked in SMM mode, and datasize and data are external input.
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This function will do basic validation, before parse the data.
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This function will parse the authentication carefully to avoid security issues, like
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buffer overflow, integer overflow.
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This function will check attribute carefully to avoid authentication bypass.
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@param[in] VariableName Name of Variable to be found.
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@param[in] VendorGuid Variable vendor GUID.
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@param[in] Data Data pointer.
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@param[in] DataSize Size of Data found. If size is less than the
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data, this value contains the required size.
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@param[in] Variable The variable information which is used to keep track of variable usage.
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@param[in] Attributes Attribute value of the variable.
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@param[in] IsPk Indicate whether it is to process pk.
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@return EFI_INVALID_PARAMETER Invalid parameter
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@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation
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check carried out by the firmware.
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@return EFI_SUCCESS Variable passed validation successfully.
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**/
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EFI_STATUS
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ProcessVarWithPk (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN VOID *Data,
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IN UINTN DataSize,
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IN VARIABLE_POINTER_TRACK *Variable,
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IN UINT32 Attributes OPTIONAL,
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IN BOOLEAN IsPk
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);
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/**
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Process variable with key exchange key for verification.
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Caution: This function may receive untrusted input.
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This function may be invoked in SMM mode, and datasize and data are external input.
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This function will do basic validation, before parse the data.
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This function will parse the authentication carefully to avoid security issues, like
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buffer overflow, integer overflow.
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This function will check attribute carefully to avoid authentication bypass.
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@param[in] VariableName Name of Variable to be found.
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@param[in] VendorGuid Variable vendor GUID.
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@param[in] Data Data pointer.
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@param[in] DataSize Size of Data found. If size is less than the
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data, this value contains the required size.
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@param[in] Variable The variable information that is used to keep track of variable usage.
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@param[in] Attributes Attribute value of the variable.
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@return EFI_INVALID_PARAMETER Invalid parameter.
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@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation
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check carried out by the firmware.
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@return EFI_SUCCESS Variable passed validation successfully.
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**/
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EFI_STATUS
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ProcessVarWithKek (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN VOID *Data,
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IN UINTN DataSize,
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IN VARIABLE_POINTER_TRACK *Variable,
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IN UINT32 Attributes OPTIONAL
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);
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/**
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Merge two buffers which formatted as EFI_SIGNATURE_LIST. Only the new EFI_SIGNATURE_DATA
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will be appended to the original EFI_SIGNATURE_LIST, duplicate EFI_SIGNATURE_DATA
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will be ignored.
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@param[in, out] Data Pointer to original EFI_SIGNATURE_LIST.
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@param[in] DataSize Size of Data buffer.
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@param[in] FreeBufSize Size of free data buffer
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@param[in] NewData Pointer to new EFI_SIGNATURE_LIST to be appended.
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@param[in] NewDataSize Size of NewData buffer.
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@param[out] MergedBufSize Size of the merged buffer
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@return EFI_BUFFER_TOO_SMALL if input Data buffer overflowed
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**/
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EFI_STATUS
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AppendSignatureList (
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IN OUT VOID *Data,
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IN UINTN DataSize,
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IN UINTN FreeBufSize,
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IN VOID *NewData,
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IN UINTN NewDataSize,
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OUT UINTN *MergedBufSize
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);
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/**
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Compare two EFI_TIME data.
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@param FirstTime A pointer to the first EFI_TIME data.
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@param SecondTime A pointer to the second EFI_TIME data.
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@retval TRUE The FirstTime is not later than the SecondTime.
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@retval FALSE The FirstTime is later than the SecondTime.
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**/
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BOOLEAN
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CompareTimeStamp (
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IN EFI_TIME *FirstTime,
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IN EFI_TIME *SecondTime
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);
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/**
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Delete matching signer's certificates when deleting common authenticated
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variable by corresponding VariableName and VendorGuid from "certdb".
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@param[in] VariableName Name of authenticated Variable.
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@param[in] VendorGuid Vendor GUID of authenticated Variable.
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@retval EFI_INVALID_PARAMETER Any input parameter is invalid.
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@retval EFI_NOT_FOUND Fail to find "certdb" or matching certs.
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@retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.
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@retval EFI_SUCCESS The operation is completed successfully.
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**/
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EFI_STATUS
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DeleteCertsFromDb (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid
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);
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/**
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Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
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Caution: This function may receive untrusted input.
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This function may be invoked in SMM mode, and datasize and data are external input.
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This function will do basic validation, before parse the data.
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This function will parse the authentication carefully to avoid security issues, like
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buffer overflow, integer overflow.
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@param[in] VariableName Name of Variable to be found.
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@param[in] VendorGuid Variable vendor GUID.
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@param[in] Data Data pointer.
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@param[in] DataSize Size of Data found. If size is less than the
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data, this value contains the required size.
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@param[in] Variable The variable information which is used to keep track of variable usage.
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@param[in] Attributes Attribute value of the variable.
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@param[in] AuthVarType Verify against PK or KEK database or private database.
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@param[out] VarDel Delete the variable or not.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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@retval EFI_SECURITY_VIOLATION The variable does NOT pass the validation
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check carried out by the firmware.
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@retval EFI_OUT_OF_RESOURCES Failed to process variable due to lack
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of resources.
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@retval EFI_SUCCESS Variable pass validation successfully.
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**/
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EFI_STATUS
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VerifyTimeBasedPayload (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN VOID *Data,
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IN UINTN DataSize,
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IN VARIABLE_POINTER_TRACK *Variable,
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IN UINT32 Attributes,
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IN AUTHVAR_TYPE AuthVarType,
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OUT BOOLEAN *VarDel
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);
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extern UINT8 *mPubKeyStore;
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extern UINT8 *mCertDbStore;
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extern UINT32 mPubKeyNumber;
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extern VOID *mHashCtx;
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#endif
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