使用class-dump-z分析支付宝APP

为了了解支付宝APP的源码结构，我们可以使用class-dump-z工具来分析支付宝二进制。

1、下载配置class_dump_z

前往https://code.google.com/p/networkpx/wiki/class_dump_z，下载tar包，然后解压配置到本地环境：

$ tar -zxvf class-dump-z_0.2a.tar.gz
$ sudo cp mac_x86/class-dump-z /usr/bin/

2、class_dump支付宝APP

$ class-dump-z Portal > Portal-dump.txt

@protocol XXEncryptedProtocol_10764b0
-(?)XXEncryptedMethod_d109df;
-(?)XXEncryptedMethod_d109d3;
-(?)XXEncryptedMethod_d109c7;
-(?)XXEncryptedMethod_d109bf;
-(?)XXEncryptedMethod_d109b8;
-(?)XXEncryptedMethod_d109a4;
-(?)XXEncryptedMethod_d10990;
-(?)XXEncryptedMethod_d1097f;
-(?)XXEncryptedMethod_d10970;
-(?)XXEncryptedMethod_d10968;
-(?)XXEncryptedMethod_d10941;
-(?)XXEncryptedMethod_d10925;
-(?)XXEncryptedMethod_d10914;
-(?)XXEncryptedMethod_d1090f;
-(?)XXEncryptedMethod_d1090a;
-(?)XXEncryptedMethod_d10904;
-(?)XXEncryptedMethod_d108f9;
-(?)XXEncryptedMethod_d108f4;
-(?)XXEncryptedMethod_d108eb;
@optional
-(?)XXEncryptedMethod_d109eb;
@end

查看得到的信息是加过密的，这个加密操作是苹果在部署到App Store时做的，所以我们还需要做一步解密操作。

3、使用Clutch解密支付宝APP

1、下载Clutch

iOS7越狱后的Cydia源里已经下载不到Clutch了，但是我们可以从网上下载好，推进iPhone。

地址：Clutch传送门

2、查看可解密的应用列表

root# ./Clutch

Clutch-1.3.2
usage: ./Clutch [flags] [application name] [...]
Applications available: 9P_RetinaWallpapers breadtrip Chiizu CodecademyiPhone FisheyeFree food GirlsCamera IMDb InstaDaily InstaTextFree iOne ItsMe3 linecamera Moldiv MPCamera MYXJ NewsBoard Photo Blur Photo Editor PhotoWonder POCO相机 Portal QQPicShow smashbandits Spark tripcamera Tuding_vITC_01 wantu WaterMarkCamera WeiBo Weibo

3、解密支付宝APP

root# ./Clutch Portal

Clutch-1.3.2
Cracking Portal...
Creating working directory...
Performing initial analysis...
Performing cracking preflight...
dumping binary: analyzing load commands
dumping binary: obtaining ptrace handle
dumping binary: forking to begin tracing
dumping binary: successfully forked
dumping binary: obtaining mach port
dumping binary: preparing code resign
dumping binary: preparing to dump
dumping binary: ASLR enabled, identifying dump location dynamically
dumping binary: performing dump
dumping binary: patched cryptid
dumping binary: writing new checksum
Censoring iTunesMetadata.plist...
Packaging IPA file...

compression level: 0
  /var/root/Documents/Cracked/支付宝钱包-v8.0.0-(Clutch-1.3.2).ipa

elapsed time: 7473ms

Applications Cracked:
Portal

Applications that Failed:

Total Success: 1 Total Failed: 0

4、导出已解密的支付宝APP

从上一步骤得知，已解密的ipa位置为：/var/root/Documents/Cracked/支付宝钱包-v8.0.0-(Clutch-1.3.2).ipa。

将其拷贝到本地去分析。

4、class_dump已解密的支付宝APP

解压.ipa后，到"支付宝钱包-v8.0.0-(Clutch-1.3.2)/Payload/Portal.app"目录下，class_dump已解密的二进制文件。

$ class-dump-z Portal > ~/Portal-classdump.txt

这回就可以得到对应的信息了：

@protocol ALPNumPwdInputViewDelegate <NSObject>
-(void)onPasswordDidChange:(id)onPassword;
@end

@protocol ALPContactBaseTableViewCellDelegate <NSObject>
-(void)shareClicked:(id)clicked sender:(id)sender;
@end

@interface MMPPayWayViewController : XXUnknownSuperclass <SubChannelSelectDelegate, UITableViewDataSource, UITableViewDelegate, CellDelegate, UIAlertViewDelegate> {
@private
  Item* channelSelected;
  BOOL _bCheck;
  BOOL _bOpenMiniPay;
  BOOL _bNeedPwd;
  BOOL _bSimplePwd;
  BOOL _bAutopayon;
  BOOL _bHasSub;
  BOOL _bFirstChannel;
  BOOL _bChangeSub;
  BOOL _bClickBack;
  UITableView* _channelListTableView;
  NSMutableArray* _channelListArray;
  NSMutableArray* _subChanneSelectedlList;
  NSMutableArray* _unCheckArray;
  UIButton* _saveButton;
  UILabel* _tipLabel;
  MMPPasswordSwichView* _payWaySwitch;
  MMPPopupAlertView* _alertView;
  UIView* _setView;
  int _originalSelectedRow;
  int _currentSelectedRow;
  NSString* _statusCode;
  ChannelListModel* _defaultChannelList;
}
@property(assign, nonatomic) BOOL bClickBack;
@property(retain, nonatomic) ChannelListModel* defaultChannelList;
@property(retain, nonatomic) NSString* statusCode;
@property(assign, nonatomic) int currentSelectedRow;
@property(assign, nonatomic) int originalSelectedRow;
@property(retain, nonatomic) UIView* setView;
@property(retain, nonatomic) MMPPopupAlertView* alertView;
@property(retain, nonatomic) MMPPasswordSwichView* payWaySwitch;
@property(assign, nonatomic, getter=isSubChannelChanged) BOOL bChangeSub;
@property(assign, nonatomic) BOOL bFirstChannel;
@property(assign, nonatomic) BOOL bHasSub;
@property(assign, nonatomic) BOOL bAutopayon;
@property(assign, nonatomic) BOOL bSimplePwd;
@property(assign, nonatomic) BOOL bNeedPwd;
@property(assign, nonatomic) BOOL bOpenMiniPay;
@property(assign, nonatomic) BOOL bCheck;
@property(retain, nonatomic) UILabel* tipLabel;
property(retain, nonatomic) UIButton* saveButton;
@property(retain, nonatomic) NSMutableArray* unCheckArray;
@property(retain, nonatomic) NSMutableArray* subChanneSelectedlList;
@property(retain, nonatomic) NSMutableArray* channelListArray;
@property(retain, nonatomic) UITableView* channelListTableView;
-(void).cxx_destruct;
-(void)subChannelDidSelected:(id)subChannel;
-(void)switchCheckButtonClicked:(id)clicked;
-(void)checkboxButtonClicked:(id)clicked;
-(void)onCellClick:(id)click;
-(void)showSubChannels;
-(void)tableView:(id)view didSelectRowAtIndexPath:(id)indexPath;
-(id)tableView:(id)view cellForRowAtIndexPath:(id)indexPath;
-(int)tableView:(id)view numberOfRowsInSection:(int)section;
-(float)tableView:(id)view heightForRowAtIndexPath:(id)indexPath;
-(int)numberOfSectionsInTableView:(id)tableView;
-(void)setTableViewFootView:(id)view;
-(void)setTableViewHeaderView:(id)view;
-(id)tableView:(id)view viewForHeaderInSection:(int)section;
-(id)tableView:(id)view viewForFooterInSection:(int)section;
-(float)tableView:(id)view heightForHeaderInSection:(int)section;
-(float)tableView:(id)view heightForFooterInSection:(int)section;
-(void)alertView:(id)view clickedButtonAtIndex:(int)index;
-(void)clickSave;
-(void)netWorkRequestWithPwd:(id)pwd;
-(void)setPayWaySwitchStates:(id)states;
-(void)changePayWaySwitch:(id)aSwitch;
-(void)scrollToSelectedRow;
-(void)didReceiveMemoryWarning;
-(void)viewDidLoad;
-(void)applicationEnterBackground:(id)background;
-(void)dealloc;
-(void)goBack;
-(BOOL)isChannelsSetChanged;
-(id)subChannelCode:(int)code;
-(id)subChannelDesc:(int)desc;
-(id)initWithDefaultData:(id)defaultData;
-(id)initWithNibName:(id)nibName bundle:(id)bundle;
-(void)commonInit:(id)init;
@end

5、分析支付宝源码片段

1、使用了@private关键字限制成员访问权限

但是实际上，在Objective-C编程中，使用@private连Keypath访问都拦不住的。

2、抛出了冗长的成员对象

这非常有利分析程序结构。