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 __init__(self, arch: Architecture): self.cVmtSelfPtr = Type.pointer(arch, Type.void()) self.cVmtIntfTable = Type.pointer(arch, Type.void()) self.cVmtAutoTable = Type.pointer(arch, Type.void()) self.cVmtInitTable = Type.pointer(arch, Type.void()) self.cVmtTypeInfo = Type.pointer(arch, Type.void()) self.cVmtFieldTable = Type.pointer(arch, Type.void()) self.cVmtMethodTable = Type.pointer(arch, Type.void()) self.cVmtDynamicTable = Type.pointer(arch, Type.void()) self.cVmtClassName = Type.pointer(arch, Type.void()) self.cVmtInstanceSize = Type.int(arch.address_size) self.cVmtParent = Type.pointer(arch, Type.void())
def create_vtable(view, vtable_name, vtable_address, max_funcs = 64): pointer_t = BinjaStruct.Pointer(view) funcs = list() for i in range(max_funcs): func_pointer_address = vtable_address + (i * view.address_size) func_address, _ = pointer_t.read(view, func_pointer_address) if func_address is None: break if not view.is_offset_executable(func_address): break func = view.get_function_at(func_pointer_address) if func is None: if i and view.get_code_refs(func_pointer_address, view.address_size): break funcs.append(func_address) if funcs: view.define_user_symbol(Symbol(SymbolType.DataSymbol, vtable_address, vtable_name)) view.define_user_data_var(vtable_address, Type.array(Type.pointer(view.arch, Type.void(), const = True), len(funcs))) return funcs
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, class_name: str, view: BinaryView): if address == 0: return None from_bytes = get_from_bytes(view) ivar_t_type = view.types['ivar_t'] ivar_t = Type.named_type_from_type( 'ivar_t', ivar_t_type ) members = get_structure_members(address, ivar_t_type, view) member_dict = {m.name: m for m in ivar_t_type.structure.members} # x64 uses uint64_t for offset, but everything else # uses uint32_t ivar_offset_type = ( member_dict['offset'].type.target if view.arch != Architecture['x86_64'] else Type.int(8, False) ) ivar_offset_type.const = True if view.get_data_var_at(address) is None: view.define_user_data_var(address, ivar_t) if members['name'] != 0: name_string = view.get_ascii_string_at(members['name'], 1) if name_string is not None: members['name'] = name_string.value else: members['name'] = '' if members['type']: type_string = view.get_ascii_string_at(members['type'], 1).value members['type'] = _lookup_type(type_string, view) if not members['type']: members['type'] = Type.pointer(view.arch, Type.void()) if members['offset']: view.define_user_data_var(members['offset'], ivar_offset_type) view.define_user_symbol( Symbol( SymbolType.DataSymbol, members['offset'], f'{members["name"]}_offset', namespace=class_name ) ) members['offset'] = from_bytes( view.read(members['offset'], member_dict['offset'].type.target.width) ) else: members['offset'] = None return cls(address, **members)
def _add_vmt_methods(bv: BinaryView, vmt: DelphiVMT, out_struct: types.Structure) -> bool: offset_ptr_size = vmt.offset_ptr_size if not vmt.seek_to_vmt_offset(vmt.vmt_offsets.cVmtParent + offset_ptr_size): return False for _ in range(len(vmt.virtual_methods)): value = vmt.read_ptr() if value == 0: continue if value not in vmt.virtual_methods: prev_offset = vmt.br_offset - offset_ptr_size raise RuntimeError( f'Invalid method address detected at 0x{prev_offset:08x} ({vmt.class_name})') # Create function if not exists if bv.get_function_at(value) is None: bv.create_user_function(value) function = bv.get_function_at(value) # Set method name if not already set function_name = function.name method_name = vmt.virtual_methods[value] if function_name.startswith('sub_'): bv.define_user_symbol(Symbol( SymbolType.FunctionSymbol, value, method_name )) # Add field to structure field_type = Type.pointer( bv.arch, Type.function( function.return_type, [(Type.void() if x.type is None else x.type) for x in function.parameter_vars], function.calling_convention ) ) field_name = method_name.split('.')[-1] out_struct.append(field_type, field_name) return True
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))
def fix_printfs(view: BinaryView): printf = view.get_symbols_by_name('_printf') if not printf: printf = view.get_symbols_by_name('printf') if not printf: return for sym in printf: function = view.get_function_at(sym.address) if not function: continue xrefs = view.get_code_refs(function.start) for xref in xrefs: caller: Function = xref.function call_mlil = caller.get_low_level_il_at(xref.address).mlil print(call_mlil) if call_mlil is None: continue fmt_operand = call_mlil.params[0] if fmt_operand.operation == MediumLevelILOperation.MLIL_VAR: log.log_warn( f"Potential format string bug: {fmt_operand.address:x}") continue elif fmt_operand.operation in ( MediumLevelILOperation.MLIL_CONST_PTR, MediumLevelILOperation.MLIL_CONST): fmt_address = fmt_operand.constant fmt = view.get_ascii_string_at(fmt_address, 2) if fmt is None: continue fmt_value = fmt.value else: continue specifiers = fmt_value.split('%') param_types = [] for specifier in specifiers[1:]: if not specifier: continue if specifier.startswith('d'): param_types.append(Type.int(4, sign=True)) elif specifier.startswith('s'): param_types.append(Type.pointer(view.arch, Type.char())) elif specifier.startswith('p'): param_types.append(Type.pointer(view.arch, Type.void())) else: log.log_warn( f'Unknown format specifier: {specifier}; skipping') param_types.append(Type.pointer(view.arch, Type.void())) param_idx = 1 params = [ FunctionParameter(Type.pointer(view.arch, Type.char()), 'fmt') ] for param in param_types: params.append(FunctionParameter(param, f'arg{param_idx}')) param_idx += 1 caller.set_call_type_adjustment(xref.address, Type.function(Type.int(4), params))
basic_types = { 'c': Type.char(), 'i': Type.int(4, True), 's': Type.int(2, True), 'l': Type.int(4, True), 'q': Type.int(8, True), 'C': Type.int(1, False), 'I': Type.int(4, False), 'S': Type.int(2, False), 'L': Type.int(4, False), 'Q': Type.int(8, False), 'f': Type.float(4), 'd': Type.float(8), 'B': Type.bool(), 'v': Type.void() } def define_types_plugin(view): log_debug("define_types_plugin") objc_types = view.platform.parse_types_from_source(_objc_types) for objc_type in objc_types.types.items(): view.define_user_type(*objc_type) def _get_from_bytes(view: BinaryView): return partial( int.from_bytes, byteorder=( "little" if view.endianness == Endianness.LittleEndian