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global_variables.py
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global_variables.py
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#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
The module is the global variables store the bug count and execution path and etc.
For simplicity, it only contain the unique object global_variables_instance of class
GlobalVariables.
"""
import utils
import z3
class GlobalVariables:
def __init__(self, contract_type: str = 'eos', lvl: int = 0, simple: bool = False) -> None:
# program counter
self.pc = 0
# global path conditions and path results
self.path_conditions_and_results = {"path_conditions": [], "results": []}
# last stack
self.last_stack = []
# mark the type of smart contract
self.contract_type = contract_type
# the bug flags variables
# block dependency bugs
self.block_dependency_count = 0
self.tapos_block_function_addr = list()
self.block_number_id_list = list()
self.send_token_function_addr = list()
# ethereum delegate call bugs
self.ethereum_delegate_call = 0
self.call_delegate_addr = list()
# ethereum greedy bugs
self.ethereum_greedy = 0
self.main_function_address = None
self.get_call_value_addr = list()
self.cannot_send_ETH = False
self.ETH_payable_function_address_set = set()
# ethereum expensive fallback bugs
self.ethereum_revert_addr = list()
self.expensive_fallback = 0
self.max_gas_cost = 0
# mode flag
self.location_mode = False
self.fake_detection_mode = False
self.forged_detection_mode = False
# forged transfer notification bugs
self.vm = None
self.forged_transfer_notification_count = 0
self.found_to_check = False
self.transfer_function_index = None
self.self_locals = set()
self.to_locals = set()
self.unpack_locals = set()
self.to_offset = None
self.contract_name_int64 = None
self.eosio_assert_addrs = set()
self.action_data_size_addrs = set()
self.read_action_data_addrs = set()
self.require_auth_addrs = set()
self.shadow_ranges = set()
# fake eos transfer bugs
self.apply_function_address = None
self.apply_params = []
self.fake_eos_transfer_count = 0
self.data_addr_dict = {}
self.eosio_token_locals = set()
# loop depth limit
self.LOOP_DEPTH_LIMIT = 10
self.BRANCH_DEPTH_LIMIT = 50
# unreachable count
self.unreachable_count = 0
# jugde if simple execute
self.is_simple = simple
# offset of library func in wasm and library
self.library_offset = 0
# flag to simulate eth.callDataCopy
self.flag_callDataCopy = 0
self.num_callDataCopy = 0
# flag to simulate eth.getCallValue
self.flag_getCallValue = 0
self.flag_getCallValue_in_function = False
self.num_getCallValue = 0
# flag to simulate eth.revert
self.flag_revert = 0
# flag to simulate eth.getCallDataSize, 0 -> symbolic, 1 -> real(>4)
self.flag_getCallDataSize = 0
# flag to simulate eth.getCaller
self.flag_getCaller = 0
self.num_getCaller = 0
# flag to simulate keccak256
self.flag_keccak256 = 0
self.num_keccak256 = 0
# flag to simulate eth.getExternalBalance
self.flag_getExternalBalance = 0
self.num_getExternalBalance = 0
# flag to detect mishandled exception
self.flag_call_mishandled_exception = 0
self.call_symbolic_ret = dict()
# simulate $div and $mul
self.num_div = 0
self.num_mul = 0
# simulate eth.storageLoad
self.num_storageLoad = 0
# sum of pc
self.sum_pc = list()
self.cur_sum_pc = 0
self.lvl = lvl
self.list_func = list()
self.len_list_func = 0
# to manage symbolic_num
self.flag_num_host = 0
self.flag_num_wasm = 0
# update check block dependency
self.dict_block_solver = dict()
# Record the initial memory location of the symbol value
# Also record the converted symbol value
self.dict_symbolic_address = dict()
# save symbolic of eth.storageStore, use it to detect reentrancy
self.list_storageStore = list()
self.ethereum_reentrancy_detection = 0
def re_init(self) -> None:
self.__init__(self.contract_type, self.lvl, self.is_simple)
def clear_count(self) -> None:
self.block_dependency_count = 0
self.fake_eos_transfer_count = 0
self.ethereum_delegate_call = 0
self.forged_transfer_notification_count = 0
self.vm = None
self.found_to_check = False
self.transfer_function_index = None
self.self_locals = set()
self.to_locals = set()
self.unpack_locals = set()
self.to_offset = None
self.contract_name_int64 = None
self.eosio_assert_addrs = set()
self.action_data_size_addrs = set()
self.read_action_data_addrs = set()
self.require_auth_addrs = set()
self.shadow_ranges = set()
self.apply_function_address = None
def sym_exec(self):
self.fake_detection_mode = False
self.forged_detection_mode = False
self.location_mode = False
def locate(self):
self.location_mode = True
def fake_detect(self):
self.fake_detection_mode = True
def forged_detect(self):
self.forged_detection_mode = True
@property
def detection_mode(self):
return self.fake_detection_mode or self.forged_detection_mode
def set_name_int64(self, name):
self.contract_name_int64 = utils.eos_abi_to_int(name)
def add_cond_and_results(self, path_condition: list, left_branch_res: list) -> None:
self.path_conditions_and_results["path_conditions"].append(path_condition[:])
self.path_conditions_and_results["results"].append(left_branch_res[:])
def add_tapos_block_function_addr(self, address: int) -> None:
self.tapos_block_function_addr.append(address)
def add_random_number_id(self, number_id: int) -> None:
self.block_number_id_list.append(number_id)
def add_send_token_function_addr(self, address: int) -> None:
self.send_token_function_addr.append(address)
def add_call_delegate_addr(self, address: int) -> None:
self.call_delegate_addr.append(address)
def add_revert_addr(self, address: int) -> None:
self.ethereum_revert_addr.append(address)
def add_get_call_value_addr(self, address: int) -> None:
self.get_call_value_addr.append(address)
def set_main_function_addr(self, address: int) -> None:
self.main_function_address = address
def set_apply_function_addr(self, address: int) -> None:
self.apply_function_address = address
def find_forged_notification(self):
self.forged_transfer_notification_count = 1
def find_block_dependence(self) -> None:
self.block_dependency_count += 1
def find_fake_eos_transfer(self) -> None:
self.fake_eos_transfer_count = 1
def find_ethereum_delegate_call(self) -> None:
self.ethereum_delegate_call += 1
def find_ethereum_greedy(self) -> None:
self.ethereum_greedy = 1
def add_flag_callDataCopy(self) -> None:
self.flag_callDataCopy += 1
def clear_flag_callDataCopy(self) -> None:
self.flag_callDataCopy = 0
def add_num_callDataCopy(self) -> None:
self.num_callDataCopy += 1
def clear_num_callDataCopy(self) -> None:
self.num_callDataCopy = 0
def add_flag_keccak256(self) -> None:
self.flag_keccak256 += 1
def clear_flag_keccak256(self) -> None:
self.flag_keccak256 = 0
def add_num_keccak256(self) -> None:
self.num_keccak256 += 1
def clear_num_keccak256(self) -> None:
self.num_keccak256 = 0
def add_flag_getCallValue(self) -> None:
self.flag_getCallValue += 1
def clear_flag_getCallValue(self) -> None:
self.flag_getCallValue = 0
def add_num_getCallValue(self) -> None:
self.num_getCallValue += 1
def clear_num_getCallValue(self) -> None:
self.num_getCallValue = 0
def change_flag_getCallValue_in_function(self) -> None:
self.flag_getCallValue_in_function = not self.flag_getCallValue_in_function
def add_flag_revert(self) -> None:
self.flag_revert = 1
def clear_flag_revert(self) -> None:
self.flag_revert = 0
def add_flag_getCaller(self) -> None:
self.flag_getCaller += 1
def clear_flag_getCaller(self) -> None:
self.flag_getCaller = 0
def add_num_getCaller(self) -> None:
self.num_getCaller += 1
def clear_num_getCaller(self) -> None:
self.num_getCaller = 0
def add_flag_getCallDataSize(self) -> None:
self.flag_getCallDataSize += 1
def clear_flag_getCallDataSize(self) -> None:
self.flag_getCallDataSize = 0
def add_num_div(self) -> None:
self.num_div += 1
def clear_num_div(self) -> None:
self.num_div = 0
def add_num_mul(self) -> None:
self.num_mul += 1
def clear_num_mul(self) -> None:
self.num_mul = 0
def add_num_storageLoad(self) -> None:
self.num_storageLoad += 1
def clear_num_storageLoad(self) -> None:
self.num_storageLoad = 0
def add_flag_getExternalBalance(self) -> None:
self.flag_getExternalBalance += 1
def clear_flag_getExternalBalance(self) -> None:
self.flag_getExternalBalance = 0
def add_num_getExternalBalance(self) -> None:
self.num_getExternalBalance += 1
def clear_num_getExternalBalance(self) -> None:
self.num_getExternalBalance = 0
def add_flag_num_host(self) -> int:
self.flag_num_host += 1
return self.flag_num_host - 1
def add_flag_num_wasm(self) -> int:
self.flag_num_wasm += 1
return self.flag_num_wasm - 1
def add_dict_block_solver(self, key, value):
if isinstance(value, z3.Solver):
self.dict_block_solver[key] = list()
self.dict_block_solver[key].append(value)
elif utils.is_symbolic(value):
self.dict_block_solver[key].append(value)
elif isinstance(value, int):
self.dict_block_solver[key].append(value)
def add_dict_symbolic_address(self, key, value):
self.dict_symbolic_address[key] = value
def find_dict_root(self, key):
dic = dict()
if not (key in self.dict_symbolic_address):
return
if isinstance(self.dict_symbolic_address[key], list):
for item in self.dict_symbolic_address[key]:
tmp = self.find_dict_root(item)
if tmp:
dic.update(tmp)
return dic
else:
dic[key] = self.dict_symbolic_address[key]
return dic
def clear_dict_symbolic_address(self):
self.dict_symbolic_address.clear()
def find_reentrancy_detection(self) -> None:
self.ethereum_reentrancy_detection +=1
global_vars = GlobalVariables()