-
Notifications
You must be signed in to change notification settings - Fork 0
/
static_analysis.py
1369 lines (1212 loc) · 63 KB
/
static_analysis.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
from models.mach_object import *
from models.macho_method_hub import *
from interpreters.inner_Interpreter import *
from datetime import datetime
from multiprocessing import Pool, Lock, Manager
from models.inner_instruction import *
from cfg_generator import *
from utils import sorted_list_for_hex_string, md5_for_file
from tqdm import tqdm
from old_checker.paste_checker import *
from old_checker.storage_checker import *
from old_checker.keychain_checker import *
from old_checker.background_checker import *
from old_checker.hotfix_checker import *
import os, shutil
from models.mongo_storage import *
from queue import Queue
from time import time
# Constant
FA_CPU_TYPE_KEY = 'cputype'
FA_CPU_SUBTYPE_KEY = 'cpu_subtype'
FA_OFFSET_KEY = 'offset'
FA_SIZE_KEY = 'size'
FA_ALIGN_KEY = 'align'
_g_return_types = []
_g_current_context = ()
def _disasm_specified_function(arch, mode, machine_code, address, base_address, slice_address):
slice_address = set(slice_address) # 使用 set，加快查询速度
code = machine_code[address - base_address:]
current_function = []
model = Cs(arch=arch, mode=mode)
model.detail = True
last_addr = address - 4
while last_addr - address + 4 < len(code):
last_addr += 4
temp_code = code[last_addr - address:]
for insn in model.disasm(temp_code, last_addr):
# !!!!!!
# !!!!!! 这里的 insn 换成自己定义的类
# !!!!!!
cs_insn = CSInstruction()
cs_insn.address = insn.address
cs_insn.id = insn.id
cs_insn.mnemonic = insn.mnemonic
cs_insn.bytes = insn.bytes
cs_insn.op_str = insn.op_str
for operand in insn.operands:
cs_operand = CSOperand()
cs_operand.type = operand.type
if operand.type == ARM64_OP_REG:
cs_operand.reg = insn.reg_name(operand.reg)
elif operand.type == ARM64_OP_MEM:
mem = CSMemory()
mem.base = insn.reg_name(operand.mem.base)
mem.index = operand.mem.index
mem.disp = operand.mem.disp
cs_operand.mem = mem
elif operand.type == ARM64_OP_IMM:
cs_operand.imm = operand.imm
cs_insn.operands.append(cs_operand)
last_addr = cs_insn.address
if hex(cs_insn.address) in slice_address:
if len(current_function) != 0:
return current_function
current_function.append(cs_insn)
else:
current_function.append(cs_insn)
return current_function
def _slice_by_function_for_arm64(arch, mode, machine_code, base_addr, slice_address, method_hub=None):
model = Cs(arch=arch, mode=mode)
model.detail = True
all_functions = []
current_function = []
last_addr = base_addr - 4
slice_addr = int(slice_address[0], 16) # 当前的函数/方法边界
fm_count = 0
progress_bar = tqdm(total=len(machine_code))
while last_addr - base_addr + 4 < len(machine_code):
last_addr += 4
progress_bar.update(4)
temp_machine_code = machine_code[last_addr - base_addr:]
start = time()
for insn in model.disasm(temp_machine_code, last_addr):
end = time()
# !!!!!!# start = time()
# !!!!!! 这里的 insn 换成自己定义的类
# !!!!!!
cs_insn = CSInstruction()
cs_insn.address = insn.address
cs_insn.id = insn.id
cs_insn.mnemonic = insn.mnemonic
cs_insn.bytes = insn.bytes
cs_insn.op_str = insn.op_str
for operand in insn.operands:
cs_operand = CSOperand()
cs_operand.type = operand.type
if operand.type == ARM64_OP_REG:
cs_operand.reg = insn.reg_name(operand.reg)
elif operand.type == ARM64_OP_MEM:
mem = CSMemory()
mem.base = insn.reg_name(operand.mem.base)
mem.index = operand.mem.index
mem.disp = operand.mem.disp
cs_operand.mem = mem
elif operand.type == ARM64_OP_IMM:
cs_operand.imm = operand.imm
cs_insn.operands.append(cs_operand)
# end = time()
# print('7 ' + str((end - start) * 1000000))
# start = time()
last_addr = cs_insn.address
progress_bar.update(4)
if last_addr < slice_addr:
current_function.append(cs_insn)
elif last_addr == slice_addr:
if len(current_function) != 0:
all_functions.append(current_function)
method_hub.insert_cs_insn(current_function)
current_function = []
fm_count += 1
slice_addr = int(slice_address[fm_count], 16)
current_function.append(cs_insn)
else: # >
while last_addr > slice_addr:
fm_count += 1
slice_addr = int(slice_address[fm_count], 16)
if last_addr == slice_addr:
if len(current_function) != 0:
all_functions.append(current_function)
method_hub.insert_cs_insn(current_function)
current_function = []
fm_count += 1
slice_addr = int(slice_address[fm_count], 16)
current_function.append(cs_insn)
else:
current_function.append(cs_insn)
# end = time()
# print('8 ' + str((end - start) * 1000000))
# start = time()
progress_bar.close()
if len(current_function) > 0:
all_functions.append(current_function)
method_hub.insert_cs_insn(current_function)
return all_functions
def _slice_basic_block(method):
slice_address = set([])
current_slice_address = method[0].address
minimal_address = method[0].address
maximal_address = method[-1].address
slice_address.add(hex(current_slice_address))
for i in range(len(method)):
cs_insn = method[i]
if (cs_insn.id == ARM64_INS_B or
cs_insn.id == ARM64_INS_CBZ or
cs_insn.id == ARM64_INS_CBNZ or
cs_insn.id == ARM64_INS_TBZ or
cs_insn.id == ARM64_INS_TBNZ):
address_op = cs_insn.operands[-1]
if address_op.type == ARM64_OP_IMM:
j_address = address_op.imm
if minimal_address <= j_address <= maximal_address:
slice_address.add(hex(j_address))
if i < len(method) - 1:
slice_address.add(hex(method[i + 1].address))
basic_blocks = {}
basic_blocks_address = []
current_basic_block = []
for cs_insn in method:
if hex(cs_insn.address) in slice_address: # 当前地址是可拆分地址
if len(current_basic_block) != 0:
# basic_blocks[hex(current_basic_block_address)] = current_basic_block
cs_insn_address = hex(current_basic_block[0].address)
basic_blocks[cs_insn_address] = current_basic_block
basic_blocks_address.append(cs_insn_address)
current_basic_block = []
current_basic_block.append(cs_insn)
if cs_insn.id == ARM64_INS_RET: # 如果当前指令是 return 指令
current_basic_block.append(cs_insn)
cs_insn_address = hex(current_basic_block[0].address)
basic_blocks[cs_insn_address] = current_basic_block
basic_blocks_address.append(cs_insn_address)
current_basic_block = []
if len(current_basic_block) != 0:
cs_insn_address = hex(current_basic_block[0].address)
basic_blocks[cs_insn_address] = current_basic_block
basic_blocks_address.append(cs_insn_address)
return basic_blocks_address, basic_blocks
# 分析基本块的可达性
def _analyse_reachable_of_basic_blocks(basic_blocks_keys, basic_blocks, method_range):
reachable = set([])
wait_to_analyse = []
block_index_array = []
basic_block_key = basic_blocks_keys[0]
reachable.add(int(basic_block_key, 16))
wait_to_analyse.append(basic_blocks[basic_block_key])
block_index_array.append(0)
while len(wait_to_analyse) > 0:
# pop
block = wait_to_analyse[0]
wait_to_analyse = wait_to_analyse[1:]
block_index = block_index_array[0]
block_index_array = block_index_array[1:]
last_id = block[-1].id
if last_id == ARM64_INS_RET: # 如果这个 block 包含 return 语句，就直接不分析了
continue
if last_id != ARM64_INS_B or (last_id == ARM64_INS_B and len(block[-1].mnemonic) > 1): # 这个是有条件跳转
if block_index < len(basic_blocks_keys) - 1:
next_block_key = basic_blocks_keys[block_index + 1]
reachable.add(int(next_block_key, 16))
next_block = basic_blocks[next_block_key]
wait_to_analyse.append(next_block)
block_index_array.append(block_index + 1)
if (last_id == ARM64_INS_B or
last_id == ARM64_INS_CBZ or
last_id == ARM64_INS_CBNZ or
last_id == ARM64_INS_TBZ or
last_id == ARM64_INS_TBNZ):
address_op = block[-1].operands[-1]
if address_op.type == ARM64_OP_IMM:
j_address = address_op.imm
minimal_address, maximal_address = method_range
if (minimal_address <= j_address <= maximal_address and
j_address not in reachable):
reachable.add(j_address)
# 找那个 block
if hex(j_address) in basic_blocks:
next_block = basic_blocks[hex(j_address)]
wait_to_analyse.append(next_block)
block_index_array.append(basic_blocks_keys.index(hex(j_address))) # 这里有个查找
return reachable
def get_obj_name(mach_info, value, class_name, class_data):
if value == SELF_POINTER: # 自己的方法
return class_name
if value <= RETURN_VALUE: # 某个方法的返回值
return_index = RETURN_VALUE - value
if return_index < len(_g_return_types):
return _g_return_types[return_index]
return 'id'
if value < SELF_POINTER: # 调用的是某个参数的方法
return 'PARAMETERS_' + str(SELF_POINTER - value - 1)
if value < 0: # 调用的是父类的方法
if class_data is None:
return class_name
else:
return class_data.super
obj_name_key = hex(value)
# 其他类
if obj_name_key in mach_info.statics_class: # 静态变量
obj_name = mach_info.statics_class[obj_name_key]
return obj_name
if obj_name_key in mach_info.symbols: # 直接可以从符号表中获得信息
obj_name = mach_info.symbols[obj_name_key]
obj_name_index = obj_name.find('$')
obj_name = obj_name[obj_name_index + 2:]
return obj_name
if obj_name_key in mach_info.class_datas: # 调用的是某个类
obj_data = mach_info.class_datas[obj_name_key]
return obj_data.name
if class_data is not None and 1 <= value // 0x8 <= len(class_data.ivars): # 类中的变量
ivar_index = value // 0x8 - 1
ivar = class_data.ivars[ivar_index]
return ivar._type
if hex(value) in mach_info.cfstrings: # 某个字符串的方法
return "NSString"
if hex(value) in mach_info.statics: # 静态变量
static_name = mach_info.statics[hex(value)]
return mach_info.symbols[hex(static_name)]
# print("Some error happens during analysis in get value in register 0 (Instance) %d" % value)
return 'id'
def handle_method_call(mach_info, class_data, class_name, method_name, inter, method_hub, instruction,
recurive_stack=None, method=True, function_name=None):
global _g_current_context
if recurive_stack is not None:
r_stack = recurive_stack.copy()
else:
r_stack = set([])
if method:
# !!!!!!
if class_data is None: # 分类或者 Block
pass
# 分类中的方法，再说
else:
class_name = class_data.name
reg0_value = inter.gen_regs[0].value
reg1_value = inter.gen_regs[1].value
# 从寄存器中获得方法的调用者
caller_name = get_obj_name(mach_info, reg0_value, class_name, class_data)
try:
meth_name = mach_info.symbols[hex(reg1_value)]
except Exception as e:
# print("Some error happens during analysis in get value in register 1 (Method)")
# print(str(e))
return False
# Handle Notification
if caller_name == 'NSNotificationCenter' and meth_name == 'addObserver:selector:name:object:':
observer = get_obj_name(mach_info, inter.gen_regs[2].value, class_name, class_data)
if hex(inter.gen_regs[3].value) in mach_info.cfstrings:
selector = mach_info.symbols[hex(mach_info.cfstrings[hex(inter.gen_regs[3].value)])]
elif hex(inter.gen_regs[3].value) in mach_info.symbols:
selector = mach_info.symbols[hex(inter.gen_regs[3].value)]
else:
selector = 'Unknown'
notification_name_key = hex(inter.gen_regs[4].value)
if notification_name_key in mach_info.symbols:
# System notification
notification = mach_info.symbols[notification_name_key]
elif notification_name_key in mach_info.cfstrings:
if hex(mach_info.cfstrings[notification_name_key]) in mach_info.symbols:
notification = mach_info.symbols[hex(mach_info.cfstrings[notification_name_key])]
else:
notification = 'Unknown'
else:
notification = 'Unknown'
mach_info.add_notification_observer(notification, observer, selector)
# Post Notification
if caller_name == 'NSNotificationCenter' and meth_name == 'postNotificationName:object:userInfo:':
notification_name_key = hex(inter.gen_regs[2].value)
if notification_name_key in mach_info.symbols:
# System notification
notification = mach_info.symbols[notification_name_key]
elif notification_name_key in mach_info.cfstrings:
if hex(mach_info.cfstrings[notification_name_key]) in mach_info.symbols:
notification = mach_info.symbols[hex(mach_info.cfstrings[notification_name_key])]
else:
notification = 'Unknown'
else:
notification = 'Unknown'
mach_info.post_notification(notification, class_name, method_name)
# 处理方法中的参数
# 从上下文中提取数据变量，来生成数据流依赖
method_arguments = mach_info.get_arguments_from_method(caller_name, meth_name)
for i in range(0, len(method_arguments)):
argument_type = method_arguments[i].type
argument = None
if argument_type == 'id' or argument_type == 'Class' or argument_type == 'SEL' or argument_type == 'Pointer':
argument = 'int'
elif argument_type == 'Float':
argument = 'float'
elif argument_type == 'Char' or argument_type == 'Integer' or argument_type == 'Bool':
argument = 'int'
if argument is None: # 默认参数为 int 类型
argument = 'int'
# 作为参数的时候
if argument == 'int':
context_reg_name = 'gen_' + str(i)
else:
context_reg_name = 'float_' + str(i)
if context_reg_name in inter.context.register_variable:
var_name = inter.context.register_variable[context_reg_name]
from_item = inter.context.variable_from[var_name]
inter.context.add_from_to(var_name, from_item, instruction, i)
else:
caller_name = '$Function'
meth_name = function_name
# 处理参数中的 Block
block_arguments, call_it = mach_info.contain_block_arguments(caller_name, meth_name)
if len(block_arguments) > 0:
for index in block_arguments:
block_value = inter.gen_regs[index].value
if block_value == 0:
continue
if hex(block_value) in mach_info.block_methods: # Global block
block_data = mach_info.block_methods[hex(block_value)]
_, block_name = mach_info.methods[hex(block_data.invoke)]
instruction.block_callback(block_name)
# 调用 Block
if call_it:
block_insn = method_hub.get_method_insn('$Block', block_name)
if block_insn is None:
if ('$Block', block_name) not in r_stack:
method_address = mach_info.get_method_address('$Block', block_name)
if method_address is not None:
block_instruction = method_hub.get_cs_insn(hex(method_address))
if block_instruction is not None:
_analyse_method(block_instruction, mach_info, method_hub, recursive_stack=r_stack)
else: # 未分析过的 Block 在 MethodHub 中提取不到
arch, mode = _g_current_context
slice_address = list(mach_info.methods.keys())
slice_address += list(mach_info.functions.keys())
block_instruction = _disasm_specified_function(arch, mode, mach_info.text,
method_address, mach_info.text_addr,
slice_address)
method_hub.insert_cs_insn(block_instruction)
_analyse_method(block_instruction, mach_info, method_hub, recursive_stack=r_stack)
else: # Stack block
if hex(block_value) not in inter.memory:
continue
# if hex(inter.memory[hex(block_value)]) not in mach_info.symbols:
# continue
dylib_name = mach_info.symbols[hex(inter.memory[hex(block_value)])]
if dylib_name == '__NSConcreteStackBlock':
type = BlockMethodTypeStack
block_data = BlockMethodData(type)
block_data.invoke = inter.memory[hex(block_value + (16 if mach_info.is_64_bit else 12))]
mach_info.methods[hex(block_data.invoke)] = '$Block', hex(block_data.invoke)
instruction.block_callback(hex(block_data.invoke))
if call_it:
block_insn = method_hub.get_method_insn('$Block', hex(block_data.invoke))
if block_insn is None:
if ('$Block', hex(block_data.invoke)) not in r_stack:
method_address = mach_info.get_method_address('$Block', hex(block_data.invoke))
if method_address is not None:
block_instruction = method_hub.get_cs_insn(hex(method_address))
if block_instruction is not None:
_analyse_method(block_instruction, mach_info, method_hub,
recursive_stack=r_stack)
else:
arch, mode = _g_current_context
slice_address = list(mach_info.methods.keys())
slice_address += list(mach_info.functions.keys())
block_instruction = _disasm_specified_function(arch, mode, mach_info.text,
block_data.invoke,
mach_info.text_addr, slice_address)
method_hub.insert_cs_insn(block_instruction)
_analyse_method(block_instruction, mach_info, method_hub, recursive_stack=r_stack)
# 处理返回值
# 递归调用方法
method_insn = method_hub.get_method_insn(caller_name, meth_name)
if method_insn is not None: # 方法指令不是空
if len(method_insn.return_type) > 0:
return_type = method_insn.return_type[0]
else:
return_type = 'None'
else:
if (caller_name, meth_name) in r_stack:
return_type = 'id'
else:
# 该方法在当前二进制文件中
method_address = mach_info.get_method_address(caller_name, meth_name)
if method_address is not None:
goto_instruction = method_hub.get_cs_insn(hex(method_address))
if goto_instruction is not None:
method_insn = _analyse_method(goto_instruction, mach_info, method_hub, recursive_stack=r_stack)
if len(method_insn.return_type) > 0:
return_type = method_insn.return_type[0]
else:
return_type = 'None'
else:
arch, mode = _g_current_context
# 根据所有 key 确定分隔地址
slice_address = list(mach_info.methods.keys())
slice_address += list(mach_info.functions.keys())
goto_instruction = _disasm_specified_function(arch, mode, mach_info.text, method_address,
mach_info.text_addr, slice_address)
method_insn = _analyse_method(goto_instruction, mach_info, method_hub, recursive_stack=r_stack)
if len(method_insn.return_type) > 0:
return_type = method_insn.return_type[0]
else:
return_type = 'None'
else:
# 该方法在动态库中
dylib_key = '_OBJC_CLASS_$_' + caller_name
if dylib_key in mach_info.dylib_frameworks_pair:
dylib_mach_info = mach_info.get_dylib_frameworks(
mach_info.dylib_frameworks_pair[dylib_key])
if dylib_mach_info is not None:
dylib_slice_address = list(dylib_mach_info.methods.keys())
dylib_slice_address += list(dylib_mach_info.functions.keys())
# 从动态库中找到该方法
address = dylib_mach_info.get_method_address(caller_name, meth_name)
if address is not None:
arch, mode = _g_current_context
dylib_method = _disasm_specified_function(arch, mode, dylib_mach_info.text, address,
dylib_mach_info.text_addr, dylib_slice_address)
dylib_method_instruction = _analyse_method(dylib_method, dylib_mach_info,
method_hub=method_hub, recursive_stack=r_stack)
if len(dylib_method_instruction.return_type) > 0:
return_type = dylib_method_instruction.return_type[0]
else:
return_type = 'None'
else:
return_type = 'None'
else:
if method:
return_type = mach_info.get_return_type_from_method(caller_name, meth_name)
else:
return_type = mach_info.get_return_type_from_function(meth_name)
else:
if method:
return_type = mach_info.get_return_type_from_method(caller_name, meth_name)
else:
return_type = mach_info.get_return_type_from_function(meth_name)
# 返回值
if return_type == '$SELF':
return_type = caller_name
# 作为返回值的时候
if not return_type == 'None':
_g_return_types.append(return_type)
inter.modify_regs('0', RETURN_VALUE - (len(_g_return_types) - 1))
inter.context.add_variable('gen_0') # 存储返回值
inter.context.var_from('var_' + str(inter.context.variable_count - 1), instruction)
# if caller_name == 'PasteBoardManager' and meth_name == 'getOutText':
# print('var_' + str(inter.context.variable_count - 1))
instruction.goto(caller_name, meth_name) # ！！！！！！！！！！！！！
return True
def handle_super_method(mach_info, class_data, inter, instruction):
reg1_value = inter.gen_regs[1].value
if hex(reg1_value) not in mach_info.symbols:
meth_name = 'unknown_method'
else:
meth_name = mach_info.symbols[hex(reg1_value)] # 解析出方法名
# 处理父类调用的返回值
# ！！！！！！！！！！！！！
if class_data is None: # None 的时候通常是分类
class_name = 'id'
return_type = 'id'
else:
class_name = class_data.name
return_type = mach_info.get_return_type_from_method(class_data.super, meth_name)
method_arguments = mach_info.get_arguments_from_method(class_name, meth_name)
for i in range(0, len(method_arguments)):
argument_type = method_arguments[i].type
argument = None
if argument_type == 'id' or argument_type == 'Class' or argument_type == 'SEL' or argument_type == 'Pointer':
argument = 'int'
elif argument_type == 'Float':
argument = 'float'
elif argument_type == 'Char' or argument_type == 'Integer' or argument_type == 'Bool':
argument = 'int'
if argument is None: # 默认先预设 int 类型的参数
argument = 'int'
# 作为参数的时候
# 从上下文中提取数据变量，来生成数据流依赖
if argument == 'int':
context_reg_name = 'gen_' + str(i)
else:
context_reg_name = 'float_' + str(i)
if context_reg_name in inter.context.register_variable:
var_name = inter.context.register_variable[context_reg_name] # 获得变量名
from_item = inter.context.variable_from[var_name] # from_item 可能是字符串或者 Instruction 类型
to_item = instruction
inter.context.add_from_to(var_name, from_item, to_item, i)
if return_type == '$SELF':
return_type = class_name
# 作为返回值的时候
if not return_type == 'None': # 返回值不为空
_g_return_types.append(return_type)
inter.modify_regs('0', RETURN_VALUE - (len(_g_return_types) - 1))
inter.context.add_variable('gen_0') # 存储返回值
inter.context.var_from('var_' + str(inter.context.variable_count - 1), instruction)
instruction.goto(class_name, meth_name)
def _analyse_basic_block(block_instruction, identify, mach_info, class_data, class_name, method_name,
inter: Interpreter, add_range, method_hub=None, recursive_stack=set([])):
# print('analyse basic block')
r_stack = recursive_stack.copy()
basic_block = MethodBasicBlockInstructions(identify)
for i in range(len(block_instruction)):
cs_insn = block_instruction[i]
results = inter.interpret_code(block_instruction, begin=i, end=i + 1) # 执行当前语句
result = None
if len(results) > 0:
result = results[0]
comment = None
if result is not None:
if hex(result) in inter.memory:
result = inter.memory[hex(result)]
if result == SELF_POINTER: # 自己的方法
comment = class_name
elif result <= RETURN_VALUE: # 某个方法的返回值
return_index = RETURN_VALUE - result
if return_index < len(_g_return_types):
comment = _g_return_types[return_index]
else:
comment = 'id'
elif result < SELF_POINTER: # 调用的是某个参数的方法
comment = 'PARAMETERS_' + str(SELF_POINTER - result - 1)
elif result < 0: # 调用的是父类的方法
pass
else:
obj_name_key = hex(result)
# 其他类
if obj_name_key in mach_info.statics_class: # 静态变量
obj_name = mach_info.statics_class[obj_name_key]
comment = obj_name
elif obj_name_key in mach_info.symbols: # 直接可以从符号表中获得信息
obj_name = mach_info.symbols[obj_name_key]
comment = obj_name
elif obj_name_key in mach_info.class_datas: # 调用的是某个类
obj_data = mach_info.class_datas[obj_name_key]
comment = obj_data.name
elif class_data is not None and 1 <= result // 0x8 <= len(class_data.ivars): # 类中的变量
ivar_index = result // 0x8 - 1
ivar = class_data.ivars[ivar_index]
comment = ivar.name
elif obj_name_key in mach_info.cfstrings: # 某个字符串的方法
# comment = mach_info.cfstrings[obj_name_key]
pass
elif obj_name_key in mach_info.statics: # 静态变量
comment = mach_info.statics[obj_name_key]
if comment is not None:
cs_insn.comment = comment
# 生成语句
insn_str = hex(cs_insn.address) + '\t' + cs_insn.bytes.hex() + '\t' + cs_insn.mnemonic + '\t' + cs_insn.op_str
instruction = Instruction(insn_str)
instruction.address = cs_insn.address
basic_block.insert_instruction(instruction)
if cs_insn.id == ARM64_INS_BL or cs_insn.id == ARM64_INS_BLR: # 函数调用
operand = cs_insn.operands[0] # 获得调用的值
if operand.type != ARM64_OP_IMM:
print('The operand type is not IMM')
try:
_function = mach_info.functions[hex(operand.imm)] # 取得调用的函数
except Exception as e:
continue
# 解析出函数名
function_name = mach_info.symbols[hex(_function)]
cs_insn.comment = function_name
if function_name == "_objc_msgSendSuper2": # 调用父类方法
handle_super_method(mach_info, class_data, inter, instruction)
# basic_block.insert_instruction(instruction)
elif function_name == "_objc_storeStrong": # 一些特殊方法
reg0_value = inter.gen_regs[0].value
reg1_value = inter.gen_regs[1].value
inter.modify_memory(reg0_value, reg1_value, 'gen_1')
elif function_name == "_objc_msgSend": # 调用方法
# 处理普通方法调用
result = handle_method_call(mach_info, class_data, class_name, method_name, inter, method_hub,
instruction, recurive_stack=r_stack)
# if result:
# basic_block.insert_instruction(instruction)
else:
result = handle_method_call(mach_info, class_data, class_name, method_name, inter, method_hub,
instruction, recursive_stack, False, function_name)
filtered_functions = {'_objc_msgSendSuper2', '_objc_storeStrong', '_objc_msgSend',
'_objc_retainAutoreleasedReturnValue', '_objc_release'}
# if result and function_name not in filtered_functions:
# basic_block.insert_instruction(instruction)
elif cs_insn.id == ARM64_INS_B:
address_op = cs_insn.operands[-1]
if len(cs_insn.mnemonic) == 1: # 无条件跳转
basic_block.jump_condition = None
# 无条件跳转出去了是不是也是返回了？
if address_op.type == ARM64_OP_IMM:
jump_address = address_op.imm
begin, end = add_range
if not (begin <= jump_address <= end):
basic_block.is_return = True
# 解析返回值传递
if 'gen_0' in inter.context.register_variable:
var_name = inter.context.register_variable['gen_0']
from_item = inter.context.variable_from[var_name]
inter.context.add_to_out(var_name, from_item)
else:
basic_block.jump_condition = cs_insn.mnemonic
if address_op.type == ARM64_OP_IMM:
basic_block.jump_to_block = hex(address_op.imm)
elif cs_insn.id == ARM64_INS_CBZ or cs_insn.id == ARM64_INS_CBNZ or cs_insn.id == ARM64_INS_TBZ or cs_insn.id == ARM64_INS_TBNZ:
address_op = cs_insn.operands[-1]
# 决定跳转条件
jump_condition = cs_insn.mnemonic + ' '
condition_op = cs_insn.operands[0]
if condition_op.type == ARM64_OP_REG:
reg_name = condition_op.reg
jump_condition += reg_name
basic_block.jump_condition = jump_condition
if address_op.type == ARM64_OP_IMM:
basic_block.jump_to_block = hex(address_op.imm)
elif cs_insn.id == ARM64_INS_RET:
basic_block.is_return = True
# 解析返回值传递
if 'gen_0' in inter.context.register_variable:
var_name = inter.context.register_variable['gen_0']
from_item = inter.context.variable_from[var_name]
inter.context.add_to_out(var_name, from_item)
return basic_block
return basic_block
def _analyse_method(method, mach_info, method_hub=None, recursive=True, recursive_stack=set([])):
r_stack = recursive_stack.copy()
def memory_provider(address):
if address < 0x1000: # 因为小于 0x1000 不会是地址，当时是为了 ivar
return address
try:
result, content = mach_info.get_memory_content(address, 8)
if result:
return content
else:
if hex(address) in mach_info.symbols:
return address
return content
except Exception as _:
return 0
def store_notify(memory, value):
if memory in mach_info.statics:
type_name = get_obj_name(mach_info, value, class_name, class_data)
static_name = mach_info.statics[memory]
mach_info.statics_class[hex(static_name)] = type_name
method_address_key = hex(method[0].address)
if method_address_key in mach_info.methods: # pass the functions
class_name, method_name = mach_info.methods[method_address_key]
elif method_address_key in mach_info.functions:
class_name = '$Function'
method_name = mach_info.symbols[hex(mach_info.functions[method_address_key])]
else:
return None
# 参数等会儿考虑
if class_name == '$Function':
arguments_count = 8 # 如果是函数，假设共有 8 个参数
arguments = []
elif class_name == '$Block':
arguments = []
else:
method_arguments = mach_info.get_arguments_from_method(class_name, method_name)
# 传入解释器的参数类型（float, int）
# 传入解释器的参数(type, length, value)
arguments = [('int', 8, SELF_POINTER), ('int', 8, CURRENT_SELECTOR)]
if len(method_arguments) > 2:
for i in range(2, len(method_arguments)):
argument_type = method_arguments[i].type
length = method_arguments[i].length
argument = None
if argument_type == 'id' or argument_type == '#id' or argument_type == 'Class' or argument_type == 'SEL' or argument_type == 'Pointer':
argument = ('int', length, SELF_POINTER - i + 1)
elif argument_type == 'Float' or argument_type == '#float' or argument_type == '#double' or argument_type == 'float' or argument_type == 'double':
argument = ('float', length, SELF_POINTER - i + 1)
elif argument_type == 'Char' or argument_type == 'Integer' or argument_type == 'Bool':
argument = ('int', length, SELF_POINTER - i + 1)
if argument is not None:
arguments.append(argument)
method_instructions = method_hub.get_method_insn(class_name, method_name)
if method_instructions is not None:
return method_instructions
# 构造一个解释器
ctx = ExecuteContext() # 构造一个上下文
inter = Interpreter(memory_provider=memory_provider, context=ctx, store_notify=store_notify, parameters=arguments)
print('Current analyse <%s: %s>' % (class_name, method_name))
r_stack.add((class_name, method_name))
class_data = None
if class_name in mach_info.class_name_address:
data_address = mach_info.class_name_address[class_name]
class_data = mach_info.class_datas[hex(data_address)]
# 用来代表当前方法
method_instructions = MethodInstructions(class_name, method_name)
# 将当前方法拆分成基本块 basic_blocks_address, basic_blocks
basic_blocks_keys, basic_blocks_instructions = _slice_basic_block(method)
method_address_range = (method[0].address, method[-1].address)
# 判断可达的块
reachable_blocks_queue = _analyse_reachable_of_basic_blocks(basic_blocks_keys, basic_blocks_instructions,
method_address_range)
blocks_instructions_queue = [] # 执行队列
basic_block_key = basic_blocks_keys[0]
blocks_instructions_queue.append(basic_blocks_instructions[basic_block_key]) # 将入口块入队列
blocks_instructions_index_queue = [0]
wait_for_follow_queue = [] # 等待分析后续基本块的当前基本块队列
wait_for_follow_count_queue = [] # 等待分析后续基本块的数量队列
wait_for_follow = None
wait_for_follow_count = 0
return_types = []
while len(blocks_instructions_queue) > 0: # 执行队列不为空
follow_count = 0
# 设置前向 block
if wait_for_follow is None and len(wait_for_follow_queue) > 0:
wait_for_follow = wait_for_follow_queue[0]
wait_for_follow_queue = wait_for_follow_queue[1:]
wait_for_follow_count = wait_for_follow_count_queue[0]
wait_for_follow_count_queue = wait_for_follow_count_queue[1:]
block_instructions = blocks_instructions_queue[0] # 队尾出队
blocks_instructions_queue = blocks_instructions_queue[1:]
block_instructions_index = blocks_instructions_index_queue[0]
blocks_instructions_index_queue = blocks_instructions_index_queue[1:]
if wait_for_follow is not None:
# 恢复寄存器状态
inter.restore_state(wait_for_follow.identify)
wait_for_follow_count -= 1
if wait_for_follow_count == 0:
wait_for_follow = None
if hex(block_instructions[0].address) in method_instructions.all_blocks: # 如果这个块被执行过了
continue
# 模拟执行这个基本块
block = _analyse_basic_block(block_instructions, hex(block_instructions[0].address),
mach_info, class_data, class_name, method_name, inter,
(method[0].address, method[-1].address), method_hub, r_stack)
method_instructions.all_blocks[block.identify] = block
# 执行完毕，获取其后续块（跳转过去的块或者下一个块）
if not block.is_return and (block.jump_to_block is None or
(block.jump_to_block is not None and block.jump_condition is not None)):
current_index = block_instructions_index
if current_index + 1 < len(basic_blocks_keys):
next_block_address_key = basic_blocks_keys[current_index + 1]
if int(next_block_address_key, 16) in reachable_blocks_queue: # 只有在该块可达的时候才有必要归入 next_block
next_block_instructions = basic_blocks_instructions[next_block_address_key]
blocks_instructions_queue.append(next_block_instructions) # 入队列
blocks_instructions_index_queue.append(current_index + 1)
follow_count += 1
block.next_block = next_block_address_key
if block.jump_to_block is not None and block.jump_to_block in basic_blocks_instructions:
jump_to_block_instructions = basic_blocks_instructions[block.jump_to_block]
blocks_instructions_queue.append(jump_to_block_instructions) # 入队列
blocks_instructions_index_queue.append(basic_blocks_keys.index(block.jump_to_block))
follow_count += 1
if follow_count > 0: # 这个块有后续的块
wait_for_follow_queue.append(block)
wait_for_follow_count_queue.append(follow_count)
inter.save_state(block.identify) # 保存此时的寄存器状态
else:
# 在这里获取返回值
return_value = inter.gen_regs[0].value # 对象的返回值肯定是存在 r0 寄存器里的
return_types.append(return_value)
# 如果入口块是空的，添加入口块
if method_instructions.entry_block is None:
method_instructions.entry_block = block
return_types = list(set(return_types))
return_types_str = []
return_type = 'id'
for rt in return_types:
return_type = get_obj_name(mach_info, rt, class_name, class_data)
return_types_str.append(return_type)
method_instructions.return_type = return_types_str
if (class_name, method_name) in mach_info.methods_type:
if 'void' not in mach_info.methods_type[(class_name, method_name)].return_type and return_type != 'id':
mach_info.methods_type[(class_name, method_name)].return_type = return_type
method_hub.insert_method_insn(method_instructions)
for data_var in ctx.data_flow:
for from_item, to_item, position in ctx.data_flow[data_var]:
if type(from_item) == str:
method_instructions.add_data_flow_from_parameter(from_item, to_item, position)
else:
method_instructions.add_data_flow_from_instruction(from_item, to_item, position)
return method_instructions
# 进行静态分析
def view_static_analysis(binary_file, app_name, arch=0, msg_queue: Queue = None, obj_queue: Queue = None):
global _g_current_context
binary_md5 = md5_for_file(binary_file)
# 用来获取动态库二进制文件
def macho_file_provider(file_path):
if '/' in binary_file:
path_components = binary_file.split('/')
path_components = path_components[:-1]
path = '/'.join(path_components)
file_path = path + '/' + file_path
return open(file_path, 'rb')
else:
return open(file_path, 'rb')
mach_o_file = open(binary_file, 'rb')
if arch == 0:
mode = Analyse_64_Bit
elif arch == 1:
mode = Analyse_32_Bit
else:
mode = Analyse_Both
# Parse the mach-o information
msg_queue.put('Open binary successfully')
msg_queue.put('Start analyzing the information of Mach-O file')
print('in static anaysfklsadjfklsadjfkljadskfjasdjflksjflkjslfj')
mach_container = load_mach_container_of_md5(binary_md5)
print('in static anaysfklsadjfklsadjfkljadskfjasdjflksjflkjslfj')
print(mach_container)
if mach_container is None:
mach_container = MachContainer(mach_o_file.read(), file_provider=macho_file_provider, mode=mode)
if len(mach_container.mach_objects) == 0:
mach_container = MachContainer(mach_o_file.read(), file_provider=macho_file_provider, mode=Analyse_32_Bit)
else:
for mach_info in mach_container.mach_objects:
mach_info.file_provider = macho_file_provider
msg_queue.put('Analyze Mach-O file finish')
methods_hubs = [] # [method_hub]
for mach_info in mach_container.mach_objects:
arch = CS_ARCH_ALL
mode = CS_MODE_32
if mach_info.cpu_type == CPU_TYPE_ARM:
arch = CS_ARCH_ARM
mode = CS_MODE_THUMB
elif mach_info.cpu_type == CPU_TYPE_ARM64:
arch = CS_ARCH_ARM64
mode = CS_MODE_ARM
elif mach_info.cpu_type == CPU_TYPE_X86_64:
arch = CS_ARCH_X86
mode = CS_MODE_32 if not mach_info.is_64_bit else CS_MODE_64
_g_current_context = (arch, mode)
slice_addresses = list(mach_info.methods.keys())
slice_addresses += list(mach_info.functions.keys())
sorted_slice_addresses = sorted_list_for_hex_string(slice_addresses)
# Start disassemble all methods
msg_queue.put('Start disassemble all methods')
print('Start disassemble all methods')
method_instructions = load_cs_instructions_of_md5(binary_md5, mach_info.is_64_bit)
# method_hub = MachoMethodHub() # 对于每一个架构都有一个