【iOS逆向与安全】在iOS状态栏中实现秒表功能的插件开发指南

witchan · 2025 年3 月 5 日 01:02

前言

在需要精确掌握时间的场景中，例如抢购活动或需要在整点进行操作的情况下，用户往往需要准确了解当前的秒数。然而，iOS系统默认的状态栏时间显示并不包含秒数，这给用户带来了不便。

为了解决这一问题，开发一个在状态栏显示秒数的插件，可以帮助用户实时掌握精确时间，提升在特定场景下的操作效率。

本篇文章将探讨如何在iOS系统中开发这样一个插件，旨在为用户提供更精确的时间显示。

一、目标

见下图的状态栏时间位置：

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二、开发环境和工具清单

mac系统
frida：动态调试
已越狱iOS设备：脱壳及frida调试
IDA Pro：静态分析

三、步骤

1、查找设置状态栏日期的调用栈

在终端执行命令frida-trace -U -m "*[UILabel setText:]" SpringBoard

并修改setText_.js：

defineHandler({
  onEnter(log, args, state) {
    log(`-[UILabel setText:${ObjC.Object(args[2])}]`);
    log('UILabel setText called from:\n' +
        Thread.backtrace(this.context, Backtracer.ACCURATE)
        .map(DebugSymbol.fromAddress).join('\n') + '\n');
  },
  onLeave(log, retval, state) {
  }
});

当时间有变化时，获取到的堆栈信息如下：

-[_UIStatusBarStringView setText:0x282967570]
-[UILabel setText:下午9:56]
UILabel setText called from:
0x1afd16180 UIKitCore!-[_UIStatusBarStringView setText:]
0x1afcf71fc UIKitCore!-[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]
0x1afcfeca4 UIKitCore!-[_UIStatusBarItem _applyUpdate:toDisplayItem:]
0x1afd5381c UIKitCore!-[_UIStatusBarDisplayItemState updateWithData:styleAttributes:]
0x1afd3be04 UIKitCore!__78-[_UIStatusBar _updateDisplayedItemsWithData:styleAttributes:extraAnimations:]_block_invoke_2
0x1ad1b2adc CoreFoundation!__NSDICTIONARY_IS_CALLING_OUT_TO_A_BLOCK__
0x1ad129280 CoreFoundation!-[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:]
0x1afd3bb60 UIKitCore!-[_UIStatusBar _updateDisplayedItemsWithData:styleAttributes:extraAnimations:]
0x1afd3b7d0 UIKitCore!-[_UIStatusBar _updateWithAggregatedData:]
0x1afd39af4 UIKitCore!__30-[_UIStatusBar initWithStyle:]_block_invoke
0x1afd4f004 UIKitCore!-[_UIStatusBarDataAggregator _updateForCoalescedKeysWithData:]
0x1afd4ea98 UIKitCore!-[_UIStatusBarDataAggregator _updateForDelayedKeysWithData:]
0x1afd4e9d8 UIKitCore!-[_UIStatusBarDataAggregator _updateForOverlayWithData:]
0x1afd4e3b0 UIKitCore!-[_UIStatusBarDataAggregator updateWithData:]
0x1afd3b4f4 UIKitCore!-[_UIStatusBar _updateWithData:completionHandler:]
0x1afd7d28c UIKitCore!-[UIStatusBar_Modern _updateWithData:force:]

获取到关键方法：[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]

2、查看[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]的源码

使用ida pro9反编译dyld_shared_cache源码。并定位到该方法，获取到关键的伪代码如下：

v38 = objc_retainAutoreleasedReturnValue(objc_msgSend(v6, "data"));
v39 = objc_retainAutoreleasedReturnValue(objc_msgSend(v38, "shortTimeEntry"));
v40 = objc_retainAutoreleasedReturnValue(objc_msgSend(v39, "stringValue"));
v41 = -[_UIStatusBarTimeItem pillTimeView](self, "pillTimeView");
v42 = objc_retainAutoreleasedReturnValue(v41);
objc_msgSend(v42, "setText:", v40);

获取到关键方法stringValue

3、trace stringValue方法

在终端执行命令frida-trace -U -m "*[* stringValue]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：

-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]

修改__handlers__/_UIStatusBarDataStringEntry/stringValue.js

defineHandler({
  onEnter(log, args, state) {
    log(`-[_UIStatusBarDataStringEntry stringValue]`);
  },

  onLeave(log, retval, state) {
        log(`-[_UIStatusBarDataStringEntry stringValue]=${ObjC.Object(retval)}=`);

  }
});

然后再次运行frida-trace -U -m "*[* stringValue]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：

-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=nil=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=3月4日周二=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=下午10:09=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=10:09=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=下午10:10=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=nil=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=3月4日周二=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=下午10:10=
-[_UIStatusBarDataStringEntry stringValue]
-[_UIStatusBarDataStringEntry stringValue]=10:10=

确定_UIStatusBarDataStringEntry就是状态栏时间的来源后，继续执行frida-trace -U -m "*[_UIStatusBarDataStringEntry *]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：

-[_UIStatusBarDataStringEntry initFromData:0x1087fc000 type:0x0 string:0x1087fc02b maxLength:0x40]
_UIStatusBarDataStringEntry initFromData called from:
0x1afd4fe8c UIKitCore!+[_UIStatusBarDataConverter convertData:fromReferenceData:]
0x1afd7c788 UIKitCore!-[UIStatusBar_Modern _dataFromLegacyData:]
0x1afd7e214 UIKitCore!-[UIStatusBar_Modern statusBarServer:didReceiveStatusBarData:withActions:]
0x1afd5ec1c UIKitCore!-[UIStatusBarServer _receivedStatusBarData:actions:animated:]
0x1afd5ee28 UIKitCore!_UIStatusBarReceivedStatusBarDataAndActions
0x1b020f130 UIKitCore!_XReceivedStatusBarDataAndActions
0x1b4413ef0 AppSupport!migHelperRecievePortCallout
0x1ad1c8fe8 CoreFoundation!__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
0x1ad1c8378 CoreFoundation!__CFRunLoopDoSource1
0x1ad1c208c CoreFoundation!__CFRunLoopRun
0x1ad1c121c CoreFoundation!CFRunLoopRunSpecific
0x1c4cc5784 GraphicsServices!GSEventRunModal
0x1afbfffe0 UIKitCore!-[UIApplication _run]
0x1afc05854 UIKitCore!UIApplicationMain
0x1d2970194 SpringBoard!SBSystemAppMain
0x1ace816b0 libdyld.dylib!start

通过堆栈信息分析，确认-[UIStatusBarServer _receivedStatusBarData:actions:animated:]为我们的目标对象

4、使用frida验证使用效果：

执行命令frida-trace -U -m "-[UIStatusBarServer _receivedStatusBarData:actions:animated:]" SpringBoard后，修改该js文件内容为：

defineHandler({
  onEnter(log, args, state) {
    log(`-[UIStatusBarServer _receivedStatusBarData:${args[2]} actions:${args[3]} animated:${args[4]}]`);
    var structPtr = args[2]; 

    log("Original timeString:", structPtr.add(43).readCString(64));

    const now = new Date();
    
    const hours = String(now.getHours()).padStart(2, '0'); // 补零
    const minutes = String(now.getMinutes()).padStart(2, '0'); // 补零
    const seconds = String(now.getSeconds()).padStart(2, '0'); // 补零
    
    var newTimeString =  `${hours}:${minutes}:${seconds}`;

    structPtr.add(43).writeUtf8String(newTimeString);

    log("Updated timeString:", structPtr.add(43).readCString(64)); 
  },

  onLeave(log, retval, state) {
  }
});

当状态栏日期变化后。日期正常显示秒表，说明该函数可用。

5、编写tweak代码

Tweak.x源码如下：

#import <CoreFoundation/CoreFoundation.h>
#import <Foundation/Foundation.h>
#import <Foundation/NSUserDefaults+Private.h>
#import "StatusBarUpdater.h"
#import "Structs.h"
#import "headers.h"
#include <string.h>
#include <sys/time.h>
static NSString * nsDomainString = @"com.witchan.precise-time";
static NSString * nsNotificationString = @"com.witchan.precise-time/preferences.changed";
static BOOL enabled;

static void notificationCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo) {
	NSNumber * enabledValue = (NSNumber *)[[NSUserDefaults standardUserDefaults] objectForKey:@"enabled" inDomain:nsDomainString];
	enabled = (enabledValue)? [enabledValue boolValue] : YES;
	NSLog(@"=witchan= 插件状态：%d", enabled);
}

%hook UIStatusBarServer
%property (nonatomic, strong) StatusBarUpdater *updater;

// SCD_Struct_UI104结构请从ida pro复制
-(void)_receivedStatusBarData:(SCD_Struct_UI104*)arg1 actions:(int)arg2 animated:(BOOL)arg3 {
   if (self.updater == nil) {
      self.updater = [[StatusBarUpdater alloc] init];
   }

   if (!enabled) {
      [self.updater stopUpdating];
      %orig;
      return;
   }
	// 获取当前时间
   NSDate *currentDate = [NSDate date];
   
   // 创建日期格式化器
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
   
   // 设置日期格式
   [dateFormatter setDateFormat:@"HH:mm:ss"]; // 24小时制
   
   // 将当前日期格式化为字符串
   NSString *formattedTime = [dateFormatter stringFromDate:currentDate];
   NSLog(@"=witchan= now timeString: %@", formattedTime);
   
   // _statusBarData.var1 =     strcpy(ret->personName, "12:33:22");

   strcpy(arg1->var1, [formattedTime UTF8String]);

   %orig(arg1, arg2, arg3);
   NSLog(@"=witchan= _receivedStatusBarData: %d %d", arg2, arg3);

   // 创建一个新结构体用于复制
   //  SCD_Struct_UI104 copy;
   //  memcpy(&copy, arg1, sizeof(SCD_Struct_UI104));  // 正确复制结构体数据

   [self.updater updateStatusBarData:*arg1 statusBarServer: self];
   [self.updater startUpdating];
}

%end

%ctor {

	NSLog(@"=witchan= precise time plugin load success");
	notificationCallback(NULL, NULL, NULL, NULL, NULL);

	CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, notificationCallback, (CFStringRef)nsNotificationString, NULL, CFNotificationSuspensionBehaviorCoalesce);
}

**完整源码下载地址：夸克网盘分享

总结

通过上述方法，用户可以在状态栏或屏幕上方实时查看秒数，满足在特定场景下对精确时间的需求，提升操作效率和成功率。

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ParadiseDuo · 2025 年3 月 5 日 01:26