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ios逆向过程中lldb调试技巧

在ios逆向过程中,善于运用lldb,会给逆向带来很大的方便

一般的命令:

1、image list -o -f  看看各个模块在内存中的基址

2、register read r0  读取寄存器r0的值。register read  读取所有寄存器的值

3、expression(或者缩写expr)  表达式 

     例子:

     expression $r6 = 1   // 设置r6寄存器的值

     expression $r6       // 查看r6寄存器的值

     expression username(源代码中变量) = @"11111"

     expression [self btnTest]     // 调用某类某方法

4、po 表达式

    例子:

    po $r6

    po username

    po [[NSString alloc] initWithData:$r2 encoding:4]   // 打印$r2寄存器的明文数据

    po [$r5 base64EncodedStringWithOptions:0];          // 打印$r5寄存器(NSData)类型的base64明文数据

5、print (type)表达式

     例子:

     print (int)$r6

     print username

 6、bt [all]   --- 打印调用堆栈

     例子:

     bt

    返回如下:

 * thread #1: tid = 0x1ee09, 0x00035e80 debug`-[ViewController loginWithUserName:password:](self=0x15d7be60, _cmd=0x00036441, username=0x15db0120, password=0x0003768c) + 168 at ViewController.m:34, queue = ‘com.apple.main-thread‘, stop reason = breakpoint 2.1

  * frame #0: 0x00035e80 debug`-[ViewController loginWithUserName:password:](self=0x15d7be60, _cmd=0x00036441, username=0x15db0120, password=0x0003768c) + 168 at ViewController.m:34

7、breakpoint list     //打印断点列表

    例子:br l

8、s   源码级别单步执行,遇到子函数则进入

9、si  单步执行,遇到子函数则进入

10、n 源码级别单步执行,遇到子函数不进入,直接步过

11、ni 单步执行,遇到子函数不进入,直接步过

12、finish/f  退出子函数

13、thread list 打印线程列表

14、image lookup -a 表达式、image list

      例子:

     image lookup -a $pc

     返回如下:

      Address: debug[0x0000b236] (debug.__TEXT.__text + 1254)

      Summary: debug`main + 58 at main.m:16

15、查找某个函数:

      对于有调试符号的这样使用

      image lookup -r -n <FUNC_REGEX>

      对于无调试符号的这样使用:

      image lookup -r -s <FUNC_REGEX>

16、disassemble(简写di) -a 地址

      disassemble -A thumb    

      可选:

      thumbv4t

      thumbv5

      thumbv5e

      等等一系列

17、memory read [起始地址 结束地址]/寄存器 -outfile 输出路径

18、内存断点 watchpoint set expression 地址    /  watchpoint set variable 变量名称 -- (源码调试用到,略过)

      例子:

      watchpoint set expression 0x1457fa70

     命中后得到结果:

     Watchpoint 3 hit:

     old value: 3

     new value: 4

18.1、内存访问断点 watchpoint set expression -w read -- 内存地址

     watchpoint set expression -w read -- 0x16b9dd91

18.2、内存写入断点 watchpoint set expression -w write -- 内存地址

     watchpoint set expression -w read -- 0x16b9dd91

18.3、条件断点 watchpoint modify -c 表达式

     例子:

     watchpoint modify -c ‘*(int *)0x1457fa70 == 20‘

     命中后得到结果:

     Watchpoint 3 hit:

     old value: 15

     new value: 20

19、找按钮事件 po [按钮名称/内存地址 allTargets] 

     例子:

    (lldb) po [[self btnTest] allTargets]
    {(
        <ViewController: 0x166af1f0>
    )}

  (lldb) po [[self btnTest] actionsForTarget:(id)0x166af1f0 forControlEvent:0]
   <__NSArrayM 0x165b8950>(
  testAction:
  )

Bash
// 在机器上实战一下:
(lldb) po [[[UIApplication sharedApplication] keyWindow] recursiveDescription]
<UIWindow:
 0x15e771c0; frame = (0 0; 320 568); gestureRecognizers = <NSArray: 
0x15e96210>; layer = <UIWindowLayer: 0x15e988e0>>
   | <UIView: 0x15eb4180; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x15eb4300>>
  
 |    | <UIButton: 0x15eb32d0; frame = (277 285; 46 30); opaque = NO;
 autoresize = RM+BM; layer = <CALayer: 0x15eb2e30>>
   |    
|    | <UIButtonLabel: 0x15db5220; frame = (0 6; 46 18); text = 
‘Button‘; opaque = NO; userInteractionEnabled = NO; layer = 
<_UILabelLayer: 0x15db5410>>
   |    | <_UILayoutGuide: 0x15eb4360; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x15eb4540>>
   |    | <_UILayoutGuide: 0x15eb4af0; frame = (0 568; 0 0); hidden = YES; layer = <CALayer: 0x15eb4b70>>

(lldb) po [(UIButton *)0x15eb32d0 allTargets]
{(
    <ViewController: 0x15e93250>
)}

(lldb) po [(UIButton *)0x15eb32d0 allTargets]
{(
    <ViewController: 0x15e93250>
)}

(lldb) po [(UIButton *)0x15eb32d0 actionsForTarget:(id)0x15e93250 forControlEvent:0]
<__NSArrayM 0x15dbfc50>(
testAction:
)
// 调用--
(lldb) po [0x15e93250 testAction:nil]
0x00210c18

 // 再来一发,对按钮属性操作

Bash
(lldb) po [[[UIApplication sharedApplication] keyWindow] recursiveDescription]
<UIWindow: 0x15e771c0; frame = (0 0; 320 568); gestureRecognizers = <NSArray: 0x15e96210>; layer = <UIWindowLayer: 0x15e988e0>>
   | <UIView: 0x15eb4180; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x15eb4300>>
   |    | <UIButton: 0x15eb32d0; frame = (277 285; 46 30); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x15eb2e30>>
   |    |    | <UIButtonLabel: 0x15db5220; frame = (0 6; 46 18); text = ‘Button‘; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x15db5410>>
   |    | <_UILayoutGuide: 0x15eb4360; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x15eb4540>>
   |    | <_UILayoutGuide: 0x15eb4af0; frame = (0 568; 0 0); hidden = YES; layer = <CALayer: 0x15eb4b70>>

(lldb) expression UIButton *$btn = (UIButton *)0x15eb32d0
(lldb) expression [$btn setHidden:YES]

20、std::string 读取方式:从内存+8的地方开始  64bit自行变通

    例:

    Bash
(lldb) x $r0+8      
0x02db9248: 20 82 e3 14 71 00 00 00 61 00 00 00 c0 82 d3 14   .惝q...a...喇赢
0x02db9258: 71 00 00 00 2b 00 00 00 20 f9 e6 14 61 00 00 00  q...+... .a...
(lldb) x/s 0x14e38220
0x14e38220: "hello!piaoyun"


参考:http://www.dllhook.com/post/51.html

 

 

ios逆向过程中lldb调试技巧