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念茜 · 更新于 2018-11-28 11:00:43

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。

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/  

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。

使用 Clutch 解密支付宝 App

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

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 

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  

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

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  

分析支付宝源码片段

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

抛出了冗长的成员对象

这非常有利分析程序结构

进一步思考

1)如何利用 class-dump 结果,结合 cycript 进行攻击呢?

2)class-dump-z 如此强大,有什么方法可以减少暴露的信息吗?

接下来的博文将针对上面的思考,继续总结~