def _get_size(self, index):
size = index.stop - index.start
if isinstance(size, BitVec):
import visitors
from manticore.core.smtlib.visitors import arithmetic_simplifier
size = arithmetic_simplifier(size)
else:
size = BitVecConstant(self._array.index_bits, size)
assert isinstance(size, BitVecConstant)
return size.value
def report(self, state_id, ty=None):
def compare_buffers(a, b):
if len(a) != len(b):
return False
cond = True
for i in range(len(a)):
cond = Operators.AND(a[i] == b[i], cond)
if cond is False:
return False
return cond
if state_id == -1:
state = self.initial_state
else:
state = self._executor._workspace.load_state(state_id,
delete=False)
world = state.platform
trace = state.context['seth.trace']
last_pc = trace[-1][1]
last_address = trace[-1][0]
try:
md_name, md_source_code, md_init_bytecode, md_metadata, md_metadata_runtime, md_hashes = self.context[
'seth']['metadata'][last_address]
except:
md_name, md_source_code, md_init_bytecode, md_metadata, md_metadata_runtime, md_hashes = None, None, None, None, None, None
try:
runtime_bytecode = world.storage[last_address]['code']
except:
runtime_bytecode = ''
e = state.context['last_exception']
if ty is not None:
if str(e) != ty:
return
print "=" * 20
print "REPORT:", e,
try:
# Magic number comes from here:
# http://solidity.readthedocs.io/en/develop/metadata.html#encoding-of-the-metadata-hash-in-the-bytecode
asm = list(
evm.EVMDecoder.decode_all(runtime_bytecode[:-9 - 33 - 2]))
asm_offset = 0
pos = 0
source_pos = md_metadata_runtime[pos]
for i in asm:
if len(md_metadata_runtime[pos]):
source_pos = md_metadata_runtime[pos]
if asm_offset == last_pc:
break
asm_offset += i.size
pos += 1
beg, size = map(int, source_pos.split(':'))
print " at:"
nl = md_source_code.count('\n')
snippet = md_source_code[beg:beg + size]
for l in snippet.split('\n'):
print ' ', nl, ' ', l
nl += 1
except:
print
print "BALANCES"
for address, account in world.storage.items():
if isinstance(account['balance'], Constant):
account['balance'] = account['balance'].value
if issymbolic(account['balance']):
m, M = solver.minmax(world.constraints,
arithmetic_simplifier(account['balance']))
if m == M:
print "\t", hex(address), M
else:
print "\t", hex(address), "range:[%x, %x]" % (m, M)
else:
print "\t", hex(address), account['balance'], "wei"
if state.platform.logs:
print "LOGS:"
for address, memlog, topics in state.platform.logs:
try:
res = memlog
if isinstance(memlog, Expression):
res = state.solve_one(memlog)
if isinstance(memlog, Array):
state.constrain(compare_buffers(memlog, res))
else:
state.constrain(memlog == res)
res1 = address
if isinstance(address, Expression):
res = state.solve_one(address)
if isinstance(address, Array):
state.constrain(compare_buffers(address, res))
else:
state.constrain(address == res)
print "\t %s: %r %s" % (hex(res1), ''.join(map(chr,
res)), topics)
except Exception, e:
print e
print "\t", address, repr(memlog), topics
class ManticoreEVM(Manticore):
class SByte():
def __init__(self, size=1):
self.size = size
def __mul__(self, reps):
return Symbol(self.size * reps)
SCHAR = SByte(1)
SUINT = SByte(32)
SValue = None
@staticmethod
def pack_msb(value):
return ''.join(ManticoreEVM.serialize_uint(value))
@staticmethod
def serialize(value):
if isinstance(value, str):
return ManticoreEVM.serialize_string(value)
if isinstance(value, list):
return ManticoreEVM.serialize_array(value)
if isinstance(value, (int, long)):
return ManticoreEVM.serialize_uint(value)
if isinstance(value, ManticoreEVM.SByte):
return ManticoreEVM.serialize_uint(
value.size) + (None, ) * value.size + (('\x00', ) *
(32 -
(value.size % 32)))
if value is None:
return (None, ) * 32
@staticmethod
def serialize_uint(value, size=32):
'''takes an int and packs it into a 32 byte string, msb first'''
assert size >= 1
bytes = []
for position in range(size):
bytes.append(Operators.EXTRACT(value, position * 8, 8))
chars = map(Operators.CHR, bytes)
return tuple(reversed(chars))
@staticmethod
def serialize_string(value):
assert isinstance(value, str)
return ManticoreEVM.serialize_uint(
len(value)) + tuple(value + ('\x00' * (32 - (len(value) % 32))))
@staticmethod
def serialize_array(value):
assert isinstance(value, list)
serialized = [ManticoreEVM.serialize_uint(len(value))]
for item in value:
serialized.append(ManticoreEVM.serialize(item))
return reduce(lambda x, y: x + y, serialized)
@staticmethod
def make_function_id(method_name):
s = sha3.keccak_256()
s.update(method_name)
return s.hexdigest()[:8].decode('hex')
@staticmethod
def make_function_call(method_name, *args):
function_id = ManticoreEVM.make_function_id(method_name)
def check_bitsize(value, size):
if isinstance(value, BitVec):
return value.size == size
return (value & ~((1 << size) - 1)) == 0
assert len(function_id) == 4
result = [tuple(function_id)]
dynamic_args = []
dynamic_offset = 32 * len(args)
for arg in args:
if isinstance(arg, (list, tuple, str, ManticoreEVM.SByte)):
result.append(ManticoreEVM.serialize(dynamic_offset))
serialized_arg = ManticoreEVM.serialize(arg)
dynamic_args.append(serialized_arg)
assert len(serialized_arg) % 32 == 0
dynamic_offset += len(serialized_arg)
else:
result.append(ManticoreEVM.serialize(arg))
for arg in dynamic_args:
result.append(arg)
return reduce(lambda x, y: x + y, result)
@staticmethod
def compile(source_code):
return compile_code(source_code)
def __init__(self):
#Make the constraint store
constraints = ConstraintSet()
#make the ethereum world state
world = evm.EVMWorld(constraints)
initial_state = State(constraints, world)
super(ManticoreEVM, self).__init__(initial_state)
#The following should go to manticore.context so we can use multiprocessing
self.code = {}
self.context['seth'] = {}
self.context['seth']['_pending_transaction'] = None
self.context['seth']['_saved_states'] = []
self.context['seth']['_final_states'] = []
self._executor.subscribe('did_load_state', self.load_state_callback)
self._executor.subscribe('will_terminate_state',
self.terminate_state_callback)
self._executor.subscribe('will_execute_instruction',
self.will_execute_instruction_callback)
self._executor.subscribe('did_read_code', self.did_read_code)
self._executor.subscribe('on_symbolic_sha3', self.symbolic_sha3)
self._executor.subscribe('on_concrete_sha3', self.concrete_sha3)
@property
def world(self):
if self.initial_state is None:
return None
return self.initial_state.platform
@property
def running_state_ids(self):
with self.locked_context('seth') as context:
if self.initial_state is not None:
return context['_saved_states'] + [-1]
else:
return context['_saved_states']
@property
def final_state_ids(self):
with self.locked_context('seth') as context:
return context['_final_states']
def get_world(self, state_id):
if state_id == -1:
return self.initial_state.platform
state = self._executor._workspace.load_state(state_id, delete=False)
return state.platform
def create_contract(self, owner, balance=0, init=None, address=None):
''' Only available when there is a single state of the world'''
with self.locked_context('seth') as context:
assert context['_pending_transaction'] is None
assert init is not None
address = self.world._new_address()
self.context['seth']['_pending_transaction'] = ('CREATE_CONTRACT',
owner, address,
balance, init)
self.run()
return address
def create_account(self, balance=0, address=None):
''' Only available when there is a single state of the world'''
with self.locked_context('seth') as context:
assert context['_pending_transaction'] is None
return self.world.create_account(address,
balance,
code='',
storage=None)
def transaction(self, caller, address, value, data):
if isinstance(data, self.SByte):
data = (None, ) * data.size
with self.locked_context('seth') as context:
context['_pending_transaction'] = ('CALL', caller, address, value,
data)
return self.run()
def run(self, **kwargs):
#Check if there is a pending transaction
with self.locked_context('seth') as context:
assert context['_pending_transaction'] is not None
#there is at least one states in seth saved states
assert context['_saved_states'] or self.initial_state
#there is no states added to the executor queue
assert len(self._executor.list()) == 0
for state_id in context['_saved_states']:
self._executor.put(state_id)
context['_saved_states'] = []
#A callback will use _pending_transaction and
#issue the transaction in each state
result = super(ManticoreEVM, self).run(**kwargs)
with self.locked_context('seth') as context:
if len(context['_saved_states']) == 1:
self._initial_state = self._executor._workspace.load_state(
context['_saved_states'][0], delete=True)
context['_saved_states'] = []
#clear pending transcations. We are done.
context['_pending_transaction'] = None
return result
def save(self, state, final=False):
#save the state to secondary storage
state_id = self._executor._workspace.save_state(state)
with self.locked_context('seth') as context:
if final:
#Keep it on a private list
context['_final_states'].append(state_id)
else:
#Keep it on a private list
context['_saved_states'].append(state_id)
return state_id
#Callbacks
def terminate_state_callback(self, state, state_id, e):
''' INTERNAL USE
Every time a state finishes executing last transaction we save it in
our private list
'''
state.context['last_exception'] = e
if e.message != 'REVERT':
# if not a revert we save the state for further transactioning
state.context['processed'] = False
if e.message == 'RETURN':
with self.locked_context('seth') as context:
ty, caller, address, value, data = context[
'_pending_transaction']
if ty == 'CREATE_CONTRACT':
world = state.platform
world.storage[address]['code'] = world.last_return
self.save(state)
e.testcase = False #Do not generate a testcase file
else:
self.save(state, final=True)
#Callbacks
def load_state_callback(self, state, state_id):
''' INTERNAL USE
When a state was just loaded from stoage we do the pending transaction
'''
if state.context.get('processed', False):
return
world = state.platform
state.context['processed'] = True
with self.locked_context('seth') as context:
ty, caller, address, value, data = context['_pending_transaction']
#Replace any none by symbolic values
if value is None:
value = state.new_symbolic_value(256, label='value')
if isinstance(data, tuple):
if any(x is None for x in data):
symbolic_data = state.new_symbolic_buffer(label='data',
nbytes=len(data))
for i in range(len(data)):
if data[i] is not None:
symbolic_data[i] = data[i]
data = symbolic_data
if ty == 'CALL':
world.transaction(address=address,
caller=caller,
data=data,
value=value)
else:
assert ty == 'CREATE_CONTRACT'
world.create_contract(caller=caller,
address=address,
balance=value,
init=data)
def will_execute_instruction_callback(self, state, instruction):
assert state.constraints == state.platform.constraints
assert state.platform.constraints == state.platform.current.constraints
with self.locked_context('coverage', set) as coverage:
coverage.add(
(state.platform.current.address, state.platform.current.pc))
def did_read_code(self, state, offset, size):
with self.locked_context('code_data', set) as code_data:
for i in range(offset, offset + size):
code_data.add((state.platform.current.address, i))
def report(self, state_id, ty=None):
if state_id == -1:
state = self.initial_state
else:
state = self._executor._workspace.load_state(state_id,
delete=False)
e = state.context['last_exception']
world = state.platform
def compare_buffers(a, b):
if len(a) != len(b):
return False
cond = True
for i in range(len(a)):
cond = Operators.AND(a[i] == b[i], cond)
if cond is False:
return False
return cond
if ty is not None:
if str(e) != ty:
return
print "=" * 20
print "REPORT:", e, "\n"
print "LOGS:"
for address, memlog, topics in state.platform.logs:
try:
res = memlog
if isinstance(memlog, Expression):
res = state.solve_one(memlog)
if isinstance(memlog, Array):
state.constrain(compare_buffers(memlog, res))
else:
state.constrain(memlog == res)
res1 = address
if isinstance(address, Expression):
res = state.solve_one(address)
if isinstance(address, Array):
state.constrain(compare_buffers(address, res))
else:
state.constrain(address == res)
print "\t %s: %r %s" % (hex(res1), ''.join(map(chr,
res)), topics)
except Exception, e:
print e
print "\t", address, repr(memlog), topics
#print state.constraints
print "INPUT SYMBOLS"
for expr in state.input_symbols:
res = state.solve_one(expr)
if isinstance(expr, Array):
state.constrain(compare_buffers(expr, res))
else:
state.constrain(expr == res)
try:
print "\t %s: %s" % (expr.name, res.encode('hex'))
except:
print "\t", expr.name + ':', res
print "BALANCES"
for address, account in world.storage.items():
if isinstance(account['balance'], Constant):
account['balance'] = account['balance'].value
if issymbolic(account['balance']):
m, M = solver.minmax(world.constraints,
arithmetic_simplifier(account['balance']))
if m == M:
print "\t", hex(address), M
else:
print "\t", hex(address), "range:[%x, %x]" % (m, M)
else:
print "\t", hex(address), account['balance']