class EmulatorConfigsDialog(QDialog):
def __init__(self, dwarf, parent=None):
super(EmulatorConfigsDialog, self).__init__(parent)
self.dwarf = dwarf
self._prefs = Prefs()
layout = QVBoxLayout(self)
self.setMinimumWidth(500)
layout.addWidget(QLabel('callbacks path'))
callbacks_layout = QHBoxLayout()
pick_path = QPushButton('choose')
pick_path.clicked.connect(self.pick_callbacks_path)
current_callbacks_path = self._prefs.get(EMULATOR_CALLBACKS_PATH)
if current_callbacks_path == '':
current_callbacks_path = 'none'
self.callbacks_path_label = QLabel(current_callbacks_path)
callbacks_layout.addWidget(pick_path)
callbacks_layout.addWidget(self.callbacks_path_label)
layout.addLayout(callbacks_layout)
layout.addWidget(QLabel('delay between instructions'))
self.instructions_delay = QLineEdit()
self.instructions_delay.setText(str(self._prefs.get(EMULATOR_INSTRUCTIONS_DELAY, 0.5)))
layout.addWidget(self.instructions_delay)
buttons = QHBoxLayout()
cancel = QPushButton('cancel')
cancel.clicked.connect(self.close)
buttons.addWidget(cancel)
accept = QPushButton('accept')
accept.clicked.connect(self.accept)
buttons.addWidget(accept)
layout.addLayout(buttons)
def pick_callbacks_path(self):
r = QFileDialog.getOpenFileName()
if len(r) > 0 and len(r[0]) > 0:
self._prefs.put(EMULATOR_CALLBACKS_PATH, r[0])
self.callbacks_path_label.setText(r[0])
@staticmethod
def show_dialog(dwarf):
dialog = EmulatorConfigsDialog(dwarf)
result = dialog.exec_()
if result == QDialog.Accepted:
try:
dialog._prefs.put(EMULATOR_INSTRUCTIONS_DELAY, float(dialog.instructions_delay.text()))
except:
pass
class Emulator(QThread):
class EmulatorSetupFailedError(Exception):
""" Setup Failed
"""
class EmulatorAlreadyRunningError(Exception):
""" isrunning
"""
onEmulatorSetup = pyqtSignal(list, name='onEmulatorSetup')
onEmulatorStart = pyqtSignal(name='onEmulatorStart')
onEmulatorStop = pyqtSignal(name='onEmulatorStop')
onEmulatorStep = pyqtSignal(name='onEmulatorStep')
onEmulatorHook = pyqtSignal(Instruction, name='onEmulatorHook')
onEmulatorMemoryHook = pyqtSignal(list, name='onEmulatorMemoryHook')
onEmulatorMemoryRangeMapped = pyqtSignal(
list, name='onEmulatorMemoryRangeMapped')
onEmulatorLog = pyqtSignal(str, name='onEmulatorLog')
# setup errors
ERR_INVALID_TID = 1
ERR_INVALID_CONTEXT = 2
ERR_SETUP_FAILED = 3
def __init__(self, dwarf):
super(Emulator, self).__init__()
self.setTerminationEnabled(True)
self.dwarf = dwarf
self._prefs = Prefs()
self._setup_done = False
self._blacklist_regs = []
self.cs = None
self.uc = None
self.context = None
self.thumb = False
self.end_ptr = 0
self.step_mode = STEP_MODE_NONE
self.current_context = None
self._current_instruction = 0
self._next_instruction = 0
self._current_cpu_mode = 0
self._last_emulated_instruction = None
self._request_stop = False
# configurations
self.callbacks_path = None
self.callbacks = None
self.instructions_delay = 0
self._start_address = 0
self._end_address = 0
# prevent emulator loop for any reason
# i.e through custom callback
# we don't want any UI freeze, so we just setup a n00b way to check if we are looping
# inside the same instruction for N times.
# notice that when an unmapped memory region is required during emulation, this will be taken from target proc
# and mapped into unicorn context. Later, the code fallback to execute the same instruction once again
self._anti_loop = 0
# reset single instance preferences
from ucdwarf.plugin import EMULATOR_CALLBACKS_PATH
self._prefs.put(EMULATOR_CALLBACKS_PATH, '')
def setup_arm(self):
self.thumb = self.context.pc.thumb
if self.thumb:
self._current_cpu_mode = unicorn.UC_MODE_THUMB
self.cs = Cs(CS_ARCH_ARM, CS_MODE_THUMB)
self.uc = unicorn.Uc(unicorn.UC_ARCH_ARM, unicorn.UC_MODE_THUMB)
# Enable VFP instr
self.uc.mem_map(0x1000, 1024)
self.uc.mem_write(0x1000, binascii.unhexlify(VFP))
self.uc.emu_start(0x1000 | 1, 0x1000 + len(VFP))
self.uc.mem_unmap(0x1000, 1024)
else:
self.cs = Cs(CS_ARCH_ARM, CS_MODE_ARM)
self.uc = unicorn.Uc(unicorn.UC_ARCH_ARM, unicorn.UC_MODE_ARM)
self._current_cpu_mode = unicorn.UC_MODE_ARM
def setup_arm64(self):
self.uc = unicorn.Uc(unicorn.UC_ARCH_ARM64,
unicorn.UC_MODE_LITTLE_ENDIAN)
self.cs = Cs(CS_ARCH_ARM64, CS_MODE_LITTLE_ENDIAN)
self._current_cpu_mode = unicorn.UC_MODE_LITTLE_ENDIAN
def setup_x86(self):
self.uc = unicorn.Uc(unicorn.UC_ARCH_X86, unicorn.UC_MODE_32)
self.cs = Cs(CS_ARCH_X86, CS_MODE_32)
def setup_x64(self):
self.uc = unicorn.Uc(unicorn.UC_ARCH_X86, unicorn.UC_MODE_64)
self.cs = Cs(CS_ARCH_X86, CS_MODE_64)
def _setup(self,
user_arch=None,
user_mode=None,
cs_arch=None,
cs_mode=None):
if user_arch is not None and user_mode is not None:
try:
self.uc = unicorn.Uc(user_arch, user_mode)
self.cs = Cs(cs_arch, cs_mode)
self.thumb = user_mode == unicorn.UC_MODE_THUMB
except:
raise self.EmulatorSetupFailedError('Unsupported arch')
else:
if self.dwarf.arch == 'arm':
self.setup_arm()
elif self.dwarf.arch == 'arm64':
self.setup_arm64()
elif self.dwarf.arch == 'ia32':
self.setup_x86()
elif self.dwarf.arch == 'x64':
self.setup_x64()
else:
# unsupported arch
raise self.EmulatorSetupFailedError('Unsupported arch')
if not self.uc or not self.cs:
raise self.EmulatorSetupFailedError('Unicorn or Capstone missing')
# enable capstone details
if self.cs is not None:
self.cs.detail = True
if not self.context.is_native_context:
raise self.EmulatorSetupFailedError(
'Cannot run emulator on non-native context')
err = self.map_range(self.context.pc.value)
if err:
raise self.EmulatorSetupFailedError('Mapping failed')
self.current_context = EmulatorContext(self.dwarf)
for reg in self.current_context._unicorn_registers:
if reg in self.context.__dict__:
if reg not in self._blacklist_regs:
self.uc.reg_write(
self.current_context._unicorn_registers[reg],
self.context.__dict__[reg].value)
self.uc.hook_add(unicorn.UC_HOOK_CODE, self.hook_code)
self.uc.hook_add(unicorn.UC_HOOK_MEM_WRITE | unicorn.UC_HOOK_MEM_READ,
self.hook_mem_access)
self.uc.hook_add(
unicorn.UC_HOOK_MEM_FETCH_UNMAPPED
| unicorn.UC_HOOK_MEM_WRITE_UNMAPPED
| unicorn.UC_HOOK_MEM_READ_UNMAPPED, self.hook_unmapped)
self.current_context.set_context(self.uc)
return 0
def run(self):
# dont call this func
if not self._setup_done:
return
try:
if self.thumb and self._start_address % 2 != 1:
self._start_address += 1
self.uc.emu_start(
self._start_address,
0xffffffffffffffff) # end is handled in hook_code
except unicorn.UcError as e:
self.log_to_ui('[*] error: ' + str(e))
except Exception as e:
self.log_to_ui('[*] error: ' + str(e))
self._setup_done = False
self.onEmulatorStop.emit()
def api(self, parts):
"""
expose api to js side for allowing emulator interaction while scripting
:param parts: arr -> cmd api split by ":::"
:return: the result from the api
"""
cmd = parts[0]
if cmd == 'clean':
return self.clean()
elif cmd == 'setup':
custom_uc_arch = None
custom_cs_arch = None
custom_uc_mode = None
custom_cs_mode = None
if len(parts) > 3:
try:
arch = 'UC_ARCH_' + parts[2].upper()
if arch in unicorn.__dict__:
custom_uc_arch = unicorn.__dict__[arch]
arch = 'CS_ARCH_' + parts[2].upper()
custom_cs_arch = capstone.__dict__[arch]
mode = 'UC_MODE_' + parts[3].upper()
if mode in unicorn.__dict__:
custom_uc_mode = unicorn.__dict__[mode]
mode = 'CS_MODE_' + parts[3].upper()
custom_cs_mode = capstone.__dict__[mode]
except:
custom_uc_arch = None
custom_cs_arch = None
custom_uc_mode = None
custom_cs_mode = None
if custom_uc_arch is not None and custom_uc_mode is not None:
err = self.setup(parts[1],
user_arch=custom_uc_arch,
user_mode=custom_uc_mode,
cs_arch=custom_cs_arch,
cs_mode=custom_cs_mode)
else:
err = self.setup(parts[1])
if err > 0:
self.context = None
return err
elif cmd == 'start':
until = 0
if len(parts) > 1:
try:
until = int(parts[1])
except:
pass
return self.emulate(until=until)
elif cmd == 'step':
step_mode = STEP_MODE_SINGLE
if len(parts) > 1:
try:
step_mode = int(parts[1])
except:
pass
return self.emulate(step_mode=step_mode)
def clean(self):
if self.isRunning():
raise self.EmulatorAlreadyRunningError()
self._current_instruction = 0
self._next_instruction = 0
self._current_cpu_mode = 0
self.context = None
self._last_emulated_instruction = None
return 0
def hook_code(self, uc, address, size, user_data):
# QApplication.processEvents()
if self._request_stop:
self.log_to_ui('Error: Emulator stopped - reached end')
self.stop()
return
# anti loop checks
if self._anti_loop == address:
self.log_to_ui('Error: Emulator stopped - looping')
self.stop()
return
self._current_instruction = address
# check if pc/eip is end_ptr
pc = 0 # address should be pc too ???
if self.dwarf.arch == 'arm':
pc = uc.reg_read(unicorn.arm_const.UC_ARM_REG_PC)
elif self.dwarf.arch == 'arm64':
pc = uc.reg_read(unicorn.arm64_const.UC_ARM64_REG_PC)
elif self.dwarf.arch == 'ia32':
pc = uc.reg_read(unicorn.x86_const.UC_X86_REG_EIP)
elif self.dwarf.arch == 'x64':
pc = uc.reg_read(unicorn.x86_const.UC_X86_REG_RIP)
if self.thumb:
pc = pc | 1
if pc == self._end_address:
self._request_stop = True
# set the current context
self.current_context.set_context(uc)
instruction = None
try:
try:
data = bytes(uc.mem_read(address, size))
assembly = self.cs.disasm(data, address)
except:
self.log_to_ui('Error: Emulator stopped - disasm')
self.stop()
return
for i in assembly:
# QApplication.processEvents()
instruction = Instruction(self.dwarf,
i,
context=self.current_context)
self.onEmulatorHook.emit(instruction)
if self.callbacks is not None:
try:
self.callbacks.hook_code(self, instruction, address,
size)
except:
# hook code not implemented in callbacks
pass
if not instruction.is_jump and not instruction.is_call:
self._next_instruction = address + i.size
else:
if instruction.is_call:
self._next_instruction = instruction.call_address
if instruction.should_change_arm_instruction_set:
if self.thumb:
self._current_cpu_mode = unicorn.UC_MODE_ARM
self.thumb = False
else:
self._current_cpu_mode = unicorn.UC_MODE_THUMB
self.thumb = True
self.cs.mode(self._current_cpu_mode)
break
# time.sleep(self.instructions_delay)
except:
self.log_to_ui('Error: Emulator stopped')
self.stop()
return
if self.step_mode != STEP_MODE_NONE:
if instruction.is_jump:
# do not break at jump as we should calculate next instruction properly
return
if self.step_mode == STEP_MODE_SINGLE:
self.stop()
else:
if instruction.is_call and self.step_mode == STEP_MODE_FUNCTION:
self.stop()
self._last_emulated_instruction = instruction
def hook_mem_access(self, uc, access, address, size, value, user_data):
v = value
if access == unicorn.UC_MEM_READ:
v = int.from_bytes(uc.mem_read(address, size), 'little')
self.onEmulatorMemoryHook.emit([uc, access, address, v])
if self.callbacks is not None:
try:
self.callbacks.hook_memory_access(self, access, address, size,
v)
except:
# hook code not implemented in callbacks
pass
def hook_unmapped(self, uc, access, address, size, value, user_data):
self.log_to_ui(
"[*] Trying to access an unmapped memory address at 0x%x" %
address)
err = self.map_range(address)
if err > 0:
self.log_to_ui('[*] Error %d mapping range at %s' %
(err, hex(address)))
return False
return True
def invalidate_configurations(self):
from ucdwarf.plugin import EMULATOR_CALLBACKS_PATH, EMULATOR_INSTRUCTIONS_DELAY
self.callbacks_path = self._prefs.get(EMULATOR_CALLBACKS_PATH, '')
self.instructions_delay = self._prefs.get(EMULATOR_INSTRUCTIONS_DELAY,
0)
def map_range(self, address):
self.dwarf.io.read_range_async(address, self.on_memory_read)
return 0
def on_memory_read(self, base, data, offset):
size = len(data)
try:
self.uc.mem_map(base, size)
except Exception as e:
self.dwarf.log(e)
return 301
try:
self.uc.mem_write(base, data)
except Exception as e:
self.dwarf.log(e)
return 302
self.log_to_ui("[*] Mapped %d at 0x%x" % (size, base))
self.onEmulatorMemoryRangeMapped.emit([base, size])
def setup(self,
tid=0,
user_arch=None,
user_mode=None,
cs_arch=None,
cs_mode=None):
if tid == 0:
# get current context tid if none provided
tid = self.dwarf.context_tid
# make sure it's int < pp: why make sure its int and then using str(tid) later??
# when calling from api its str
if isinstance(tid, str):
try:
tid = int(tid)
except ValueError:
return self.ERR_INVALID_TID
if not isinstance(tid, int):
return self.ERR_INVALID_TID
self.context = None
if str(tid) in self.dwarf.contexts:
self.context = self.dwarf.contexts[str(tid)]
if tid == 0 or self.context is None or not self.context.is_native_context:
# prevent emulation if out-of-context
return self.ERR_INVALID_CONTEXT
try:
self._setup(user_arch=user_arch,
user_mode=user_mode,
cs_arch=cs_arch,
cs_mode=cs_mode)
self.onEmulatorSetup.emit([user_arch, user_mode])
except self.EmulatorSetupFailedError:
return self.ERR_SETUP_FAILED
return 0
def start(self, priority=QThread.HighPriority):
# dont call this func
if not self._setup_done:
return
return super().start(priority=priority)
def emulate(self,
until=0,
step_mode=STEP_MODE_NONE,
user_arch=None,
user_mode=None,
cs_arch=None,
cs_mode=None):
if self.isRunning():
raise self.EmulatorAlreadyRunningError()
if isinstance(until, str):
try:
until = int(until, 16)
except ValueError:
until = 0
if until and isinstance(until, int):
self.end_ptr = utils.parse_ptr(until)
if self.end_ptr == 0:
# invalid end pointer
raise self.EmulatorSetupFailedError('Invalid EndPtr')
if self.context is None:
err = self.setup(user_arch=user_arch,
user_mode=user_mode,
cs_arch=cs_arch,
cs_mode=cs_mode)
if err > 0:
# make sure context is None if setup failed for any reason. we want a clean setup later
self.context = None
err_msg = 'unhandled error'
if err == self.ERR_INVALID_TID:
err_msg = 'invalid thread id'
elif err == self.ERR_INVALID_CONTEXT:
err_msg = 'invalid context'
raise self.EmulatorSetupFailedError('Setup failed: %s' %
err_msg)
# calculate the start address
address = self._next_instruction
if address == 0:
if self.uc._arch == unicorn.UC_ARCH_ARM:
address = self.uc.reg_read(unicorn.arm_const.UC_ARM_REG_PC)
elif self.uc._arch == unicorn.UC_ARCH_ARM64:
address = self.uc.reg_read(unicorn.arm64_const.UC_ARM64_REG_PC)
elif self.uc._arch == unicorn.UC_ARCH_X86 and self.uc._mode == unicorn.UC_MODE_32:
address = self.uc.reg_read(unicorn.x86_const.UC_X86_REG_EIP)
elif self.uc._arch == unicorn.UC_ARCH_X86 and self.uc._mode == unicorn.UC_MODE_64:
address = self.uc.reg_read(unicorn.x86_const.UC_X86_REG_RIP)
else:
raise self.EmulatorSetupFailedError('Unsupported arch')
if until > 0:
self.log_to_ui('[*] start emulation from %s to %s' %
(hex(address), hex(self.end_ptr)))
else:
if step_mode == STEP_MODE_NONE or step_mode == STEP_MODE_SINGLE:
self.log_to_ui('[*] stepping %s' % hex(address))
elif step_mode == STEP_MODE_FUNCTION:
self.log_to_ui('[*] stepping to next function call')
self.onEmulatorStart.emit()
# invalidate prefs before start
self.invalidate_configurations()
# load callbacks if needed
if self.callbacks_path is not None and self.callbacks_path != '':
try:
spec = spec_from_loader(
"callbacks",
SourceFileLoader("callbacks", self.callbacks_path))
self.callbacks = module_from_spec(spec)
spec.loader.exec_module(self.callbacks)
except Exception as e:
self.log_to_ui('[*] failed to load callbacks: %s' % str(e))
# reset callbacks path
from ucdwarf.plugin import EMULATOR_CALLBACKS_PATH
self._prefs.put(EMULATOR_CALLBACKS_PATH, '')
self.callbacks_path = ''
self.callbacks = None
else:
self.callbacks = None
# until is 0 (i.e we are stepping)
if until == 0 and step_mode == STEP_MODE_NONE:
self.step_mode = STEP_MODE_SINGLE
else:
self.step_mode = step_mode
self._start_address = address
if self.thumb:
if self._start_address % 2 == 0:
self._start_address = self._start_address | 1
else:
if self._start_address % 2 != 0:
self._start_address -= 1
self._end_address = self.end_ptr
self._setup_done = True
self.start()
def stop(self):
if self.isRunning():
self.uc.emu_stop()
def log_to_ui(self, what):
self.onEmulatorLog.emit(what)
