path: root/SecurityPkg/VariableAuthenticated/RuntimeDxe/AuthService.h

/** @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 - 2015, 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_H_
#define _AUTHSERVICE_H_

#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256
#define EFI_CERT_TYPE_RSA2048_SIZE        256

///
/// Size of AuthInfo prior to the data payload.
///
#define AUTHINFO_SIZE ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION, AuthInfo)) + \
                       (OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) + \
                       sizeof (EFI_CERT_BLOCK_RSA_2048_SHA256))

#define AUTHINFO2_SIZE(VarAuth2) ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \
                                  (UINTN) ((EFI_VARIABLE_AUTHENTICATION_2 *) (VarAuth2))->AuthInfo.Hdr.dwLength)

#define OFFSET_OF_AUTHINFO2_CERT_DATA ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \
                                       (OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)))

///
/// "AuthVarKeyDatabase" variable for the Public Key store.
///
#define AUTHVAR_KEYDB_NAME      L"AuthVarKeyDatabase"

///
/// "certdb" variable stores the signer's certificates for non PK/KEK/DB/DBX
/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.
/// 
///
#define EFI_CERT_DB_NAME        L"certdb"

///
/// 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;

#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()

/**
  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 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]  Variable                    The variable information which is used to keep track of variable usage.
  @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_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 passed validation successfully.

**/
EFI_STATUS
ProcessVariable (
  IN     CHAR16                             *VariableName,
  IN     EFI_GUID                           *VendorGuid,
  IN     VOID                               *Data,
  IN     UINTN                              DataSize,
  IN     VARIABLE_POINTER_TRACK             *Variable,
  IN     UINT32                             Attributes
  );

/**
  Update platform mode.

  @param[in]      Mode                    SETUP_MODE or USER_MODE.

  @return EFI_INVALID_PARAMETER           Invalid parameter.
  @return EFI_SUCCESS                     Update platform mode successfully.

**/
EFI_STATUS
UpdatePlatformMode (
  IN  UINT32                    Mode
  );

/**
  Initializes for authenticated varibale service.

  @param[in] MaxAuthVariableSize    Reflect the overhead associated with the saving
                                    of a single EFI authenticated variable with the exception
                                    of the overhead associated with the length
                                    of the string name of the EFI variable.

  @retval EFI_SUCCESS           Function successfully executed.
  @retval EFI_OUT_OF_RESOURCES  Fail to allocate enough memory resources.

**/
EFI_STATUS
AutenticatedVariableServiceInitialize (
  IN UINTN      MaxAuthVariableSize
  );

/**
  Initializes for cryptlib service before use, include register algrithm and allocate scratch.

**/
VOID
CryptLibraryInitialize (
  VOID
  );

/**
  Check input data form to make sure it is a valid EFI_SIGNATURE_LIST for PK/KEK variable.

  @param[in]  VariableName                Name of Variable to be check.
  @param[in]  VendorGuid                  Variable vendor GUID.
  @param[in]  Data                        Point to the variable data to be checked.
  @param[in]  DataSize                    Size of Data.

  @return EFI_INVALID_PARAMETER           Invalid signature list format.
  @return EFI_SUCCESS                     Passed signature list format check successfully.
  
**/
EFI_STATUS
CheckSignatureListFormat(
  IN  CHAR16                    *VariableName,
  IN  EFI_GUID                  *VendorGuid,
  IN  VOID                      *Data,
  IN  UINTN                     DataSize
  );

/**
  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]  Variable                    The variable information which is used to keep track of variable usage.
  @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  VARIABLE_POINTER_TRACK    *Variable,
  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]  Variable                    The variable information that is used to keep track of variable usage.
  @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 passed validation successfully.

**/
EFI_STATUS
ProcessVarWithKek (
  IN  CHAR16                    *VariableName,
  IN  EFI_GUID                  *VendorGuid,
  IN  VOID                      *Data,
  IN  UINTN                     DataSize,
  IN  VARIABLE_POINTER_TRACK    *Variable,
  IN  UINT32                    Attributes OPTIONAL
  );

/**
  Merge two buffers which formatted as EFI_SIGNATURE_LIST. Only the new EFI_SIGNATURE_DATA
  will be appended to the original EFI_SIGNATURE_LIST, duplicate EFI_SIGNATURE_DATA
  will be ignored.

  @param[in, out]  Data             Pointer to original EFI_SIGNATURE_LIST.
  @param[in]       DataSize         Size of Data buffer.
  @param[in]       FreeBufSize      Size of free data buffer 
  @param[in]       NewData          Pointer to new EFI_SIGNATURE_LIST to be appended.
  @param[in]       NewDataSize      Size of NewData buffer.
  @param[out]      MergedBufSize    Size of the merged buffer

  @return EFI_BUFFER_TOO_SMALL if input Data buffer overflowed

**/
EFI_STATUS
AppendSignatureList (
  IN  OUT VOID            *Data,
  IN  UINTN               DataSize,
  IN  UINTN               FreeBufSize,
  IN  VOID                *NewData,
  IN  UINTN               NewDataSize,
  OUT UINTN               *MergedBufSize
  );

/**
  Compare two EFI_TIME data.


  @param FirstTime           A pointer to the first EFI_TIME data.
  @param SecondTime          A pointer to the second EFI_TIME data.

  @retval  TRUE              The FirstTime is not later than the SecondTime.
  @retval  FALSE             The FirstTime is later than the SecondTime.

**/
BOOLEAN
CompareTimeStamp (
  IN EFI_TIME               *FirstTime,
  IN EFI_TIME               *SecondTime
  );

/**
  Delete matching signer's certificates when deleting common authenticated
  variable by corresponding VariableName and VendorGuid from "certdb".

  @param[in]  VariableName   Name of authenticated Variable.
  @param[in]  VendorGuid     Vendor GUID of authenticated Variable.

  @retval  EFI_INVALID_PARAMETER Any input parameter is invalid.
  @retval  EFI_NOT_FOUND         Fail to find "certdb" 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
  );

/**
  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]  Variable                    The variable information which is used to keep track of variable usage.
  @param[in]  Attributes                  Attribute value of the variable.
  @param[in]  AuthVarType                 Verify against PK or KEK database or private database.
  @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
VerifyTimeBasedPayload (
  IN     CHAR16                             *VariableName,
  IN     EFI_GUID                           *VendorGuid,
  IN     VOID                               *Data,
  IN     UINTN                              DataSize,
  IN     VARIABLE_POINTER_TRACK             *Variable,
  IN     UINT32                             Attributes,
  IN     AUTHVAR_TYPE                       AuthVarType,
  OUT    BOOLEAN                            *VarDel
  );

extern UINT8  *mPubKeyStore;
extern UINT8  *mCertDbStore;
extern UINT32 mPubKeyNumber;
extern VOID   *mHashCtx;

#endif