def _parse_structure(type_string: str, view: BinaryView) -> Type:
type_name = ''.join(
takewhile(lambda i: i != '=', type_string)
)
type_string = type_string[len(type_name)+1:]
fields = []
while type_string:
if type_string[0] == '{':
field_type, type_string = _parse_structure(type_string[1:], view)
fields.append(field_type)
elif type_string[0] == '}':
type_string = type_string[1:]
break
elif type_string[0] == '[':
array_size = ''.join(takewhile(str.isdigit, type_string[1:]))
array_type = ''.join(
takewhile(lambda i: i != ']', type_string[1:])
)
type_string = type_string[len(array_size)+len(array_type)+2:]
fields.append(
Type.array(_lookup_type(array_type, view), int(array_size))
)
elif type_string[0] == ']':
type_string = type_string[1:]
continue
elif _lookup_type(type_string[0], view):
fields.append(_lookup_type(type_string[0], view))
type_string = type_string[1:]
else:
log_debug(f"Not sure what is going on with this type: {type_string!r}")
raise NotImplementedError(f"{type_string!r}")
parsed_struct = Structure()
for field in fields:
parsed_struct.append(field)
log_debug(f"Created {type_name}={parsed_struct}")
view.define_user_type(type_name, Type.structure_type(parsed_struct))
return (
Type.named_type_from_type(
type_name,
view.types.get(type_name)
),
type_string
)
def _lookup_type(type_string: str, view: BinaryView):
if type_string in basic_types:
return basic_types[type_string]
elif type_string == '*':
return Type.pointer(view.arch, Type.char())
elif type_string.startswith('@'):
if type_string[2:-1] in view.types:
return Type.pointer(
view.arch,
Type.named_type_from_type(
type_string[2:-1],
view.types[type_string[2:-1]]
)
)
elif type_string != '@?' and type_string != '@':
if type_string[2:-1]:
new_type = Type.named_type_from_type(
type_string[2:-1], Type.structure_type(Structure()))
view.define_user_type(type_string[2:-1], new_type)
else:
new_type = Type.void()
return Type.pointer(view.arch, new_type)
else:
return Type.pointer(view.arch, Type.void())
elif type_string.startswith('#'):
return Type.pointer(view.arch, Type.void())
elif type_string == ':':
return view.types['SEL']
else:
return Type.pointer(view.arch, Type.void())
def visit_MLIL_CONST(self, expr):
view = expr.function.source_function.view
class_symbol = view.get_symbol_at(expr.constant)
if class_symbol is None:
return
log_debug(class_symbol.name)
class_match = re.match(
r'_OBJC_(META)?CLASS_\$_(?P<classname>[_A-Za-z0-9=/]+)(@GOT)?',
class_symbol.name
)
class_name = class_match.group('classname')
class_type = view.types.get(class_name)
if class_type is None:
view.define_user_type(class_name, Type.structure_type(Structure()))
class_type = view.types.get(class_name)
return Type.pointer(
view.arch,
Type.named_type_from_type(class_name, class_type)
)
def update_memory_view(self):
if self.adapter == None:
raise Exception('missing adapter')
if self.memory_view == None:
raise Exception('missing memory_view')
for symbol in self.old_symbols:
# Symbols are immutable so just destroy the old one
self.memory_view.undefine_auto_symbol(symbol)
for dv in self.old_dvs:
self.memory_view.undefine_data_var(dv)
self.old_symbols = []
self.old_dvs = set()
new_dvs = set()
for (reg, addr) in self.registers:
bits = self.registers.bits(reg)
symbol_name = '$' + reg
self.memory_view.define_auto_symbol(
Symbol(SymbolType.ExternalSymbol,
addr,
symbol_name,
namespace=symbol_name))
self.old_symbols.append(
self.memory_view.get_symbol_by_raw_name(symbol_name,
namespace=symbol_name))
self.memory_view.define_data_var(addr,
Type.int(bits // 8, sign=False))
self.old_dvs.add(addr)
# Special struct for stack frame
if self.remote_arch.name == 'x86_64':
width = self.registers['rbp'] - self.registers[
'rsp'] + self.remote_arch.address_size
if width > 0:
if width > 0x1000:
width = 0x1000
struct = Structure()
struct.type = StructureType.StructStructureType
struct.width = width
for i in range(0, width, self.remote_arch.address_size):
var_name = "var_{:x}".format(width - i)
struct.insert(i, Type.pointer(self.remote_arch,
Type.void()), var_name)
self.memory_view.define_data_var(self.registers['rsp'],
Type.structure_type(struct))
self.memory_view.define_auto_symbol(
Symbol(SymbolType.ExternalSymbol,
self.registers['rsp'],
"$stack_frame",
raw_name="$stack_frame"))
self.old_symbols.append(
self.memory_view.get_symbol_by_raw_name("$stack_frame"))
self.old_dvs.add(self.registers['rsp'])
else:
pass
def update_memory_view(self):
if self.adapter == None:
raise Exception('missing adapter')
if self.memory_view == None:
raise Exception('missing memory_view')
addr_regs = {}
reg_addrs = {}
for reg in self.adapter.reg_list():
addr = self.adapter.reg_read(reg)
reg_symbol_name = '$' + reg
if addr not in addr_regs.keys():
addr_regs[addr] = [reg_symbol_name]
else:
addr_regs[addr].append(reg_symbol_name)
reg_addrs[reg] = addr
for symbol in self.old_symbols:
# Symbols are immutable so just destroy the old one
self.memory_view.undefine_auto_symbol(symbol)
for dv in self.old_dvs:
self.memory_view.undefine_data_var(dv)
self.old_symbols = []
self.old_dvs = set()
new_dvs = set()
for (reg, addr) in reg_addrs.items():
symbol_name = '$' + reg
self.memory_view.define_auto_symbol(Symbol(SymbolType.ExternalSymbol, addr, symbol_name, namespace=symbol_name))
self.old_symbols.append(self.memory_view.get_symbol_by_raw_name(symbol_name, namespace=symbol_name))
new_dvs.add(addr)
for new_dv in new_dvs:
self.memory_view.define_data_var(new_dv, Type.int(8))
self.old_dvs.add(new_dv)
# Special struct for stack frame
if self.bv.arch.name == 'x86_64':
width = reg_addrs['rbp'] - reg_addrs['rsp'] + self.bv.arch.address_size
if width > 0:
if width > 0x1000:
width = 0x1000
struct = Structure()
struct.type = StructureType.StructStructureType
struct.width = width
for i in range(0, width, self.bv.arch.address_size):
var_name = "var_{:x}".format(width - i)
struct.insert(i, Type.pointer(self.bv.arch, Type.void()), var_name)
self.memory_view.define_data_var(reg_addrs['rsp'], Type.structure_type(struct))
self.memory_view.define_auto_symbol(Symbol(SymbolType.ExternalSymbol, reg_addrs['rsp'], "$stack_frame", raw_name="$stack_frame"))
self.old_symbols.append(self.memory_view.get_symbol_by_raw_name("$stack_frame"))
self.old_dvs.add(reg_addrs['rsp'])
else:
raise NotImplementedError('only x86_64 so far')
def from_address(cls,
address: int,
self_type: str,
view: BinaryView,
is_class=False):
if address == 0:
return None
if self_type not in view.types:
view.define_user_type(self_type, Type.structure_type(Structure()))
method_t_type = view.get_type_by_name('method_t')
method_t = Type.named_type_from_type('method_t', method_t_type)
if view.get_data_var_at(address) is None:
view.define_user_data_var(address, method_t)
members = get_structure_members(address, method_t_type, view)
members['name'] = (view.get_ascii_string_at(members['name'], 1).value
if members['name'] else '')
members['types'] = parse_function_type(
view.get_ascii_string_at(members['types'], 1).value
if members['types'] else '', self_type, view, is_class)
members['imp'] = view.get_function_at(members['imp'])
if members['imp'] is not None:
if not is_class:
method_name = f'-[{self_type} {members["name"]}]'
else:
method_name = f'+[{self_type} {members["name"]}]'
if view.symbols.get(method_name):
namespace = f'{members["imp"].start}'
else:
namespace = None
view.define_user_symbol(
Symbol(SymbolType.FunctionSymbol,
members['imp'].start,
method_name,
namespace=namespace))
if members['types'] is not None:
members['imp'].function_type = members['types']
return cls(address, **members)
def from_address(cls, address: int, view: BinaryView) -> Protocol:
if address == 0:
return None
from .class_t import Class
from_bytes = partial(int.from_bytes,
byteorder=("little" if view.endianness
== Endianness.LittleEndian else "big"))
protocol_t = Type.named_type_from_type(
'protocol_t', view.get_type_by_name('protocol_t'))
if not view.get_data_var_at(address):
view.define_user_data_var(address, protocol_t)
members = {
m.name: from_bytes(view.read(address + m.offset, m.type.width))
for m in view.get_type_by_name('protocol_t').structure.members
}
members['isa'] = Class.from_address(members['isa'], view)
members['name'] = (view.get_ascii_string_at(members['name'], 1).value
if members['name'] != 0 else '')
if members['name'] not in view.types:
view.define_user_type(members['name'],
Type.structure_type(Structure()))
members['protocols'] = ProtocolList.from_address(
members['protocols'], view)
members['instanceMethods'] = MethodList.from_address(
members['instanceMethods'], members['name'], view)
members['optionalInstanceMethods'] = MethodList.from_address(
members['optionalInstanceMethods'], members['name'], view)
new_protocol = cls(address, **members)
view.session_data['Protocols'][new_protocol.name] = new_protocol
return new_protocol
def define_type(self):
structure = Structure()
structure.type = StructureType.ClassStructureType
structure.width = self.vtable.instanceSize
structure.insert(0, Type.pointer(self._view.arch, Type.void()), 'isa')
classes = [self]
current_superclass = self.superclass
while current_superclass:
classes.append(current_superclass)
current_superclass = current_superclass.superclass
while classes:
current_class = classes.pop()
if current_class.vtable.ivars is None:
continue
ivar_list = current_class.vtable.ivars
for name, ivar in ivar_list.ivars.items():
structure.insert(ivar.offset, ivar.type, name)
self._view.define_user_type(self.vtable.name,
Type.structure_type(structure))
from binaryninja import (
Architecture,
FunctionParameter,
Platform,
QualifiedName,
Type,
TypeLibrary,
Structure
)
advapi32_x86 = TypeLibrary.new(Architecture["x86"], "advapi32.dll")
advapi32_x86.add_platform(Platform["windows-x86"])
BOOL = Type.int(4, altname="BOOL")
HCRYPTPROV_type = Type.structure_type(Structure())
HCRYPTPROV = Type.named_type_from_type(
"HCRYPTPROV", HCRYPTPROV_type
)
LPCSTR_type = Type.pointer(Architecture["x86"], Type.char())
LPCSTR = Type.named_type_from_type('LPCSTR', LPCSTR_type)
DWORD = Type.int(4, sign=False, altname="DWORD")
advapi32_x86.add_named_type("HCRYPTPROV", HCRYPTPROV_type)
CryptAcquireContextA = Type.function(
BOOL,
[
FunctionParameter(
