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[原创]Unity逆向获取组件通杀方案
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2022-7-11 02:30
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需求起因
由于需要对Adnroid手游游合规检测，即需要识别游戏是否展示“游戏协议声明”，因此需要提取游戏组件内相关原生组件文本。
由于目前Android手游主要以Unity引擎为主，因此首先尝试切入Unity引擎，获取原生组件通杀方案。
实现思路
首先Unity开发语言是C#，
但是由于起初C#生态并没有跨平台支持（真的瓜这决策...），然而Unity又需要跨平台，因此早年间，为了兼容C#和跨平台需求，Unity自己重写了一套C#解释引擎，并且完全支持原生C#语法。
C#作为虚拟机语言，原生是提供了“反射”功能，所以Unity引擎作为C#解释器，也必然支持反射功能，无论是使用mono编译还是il2cpp编译，他都会支持“反射”。
因此我们的突破点，便是这个“反射”。
使用反射，即可获取C#中任何类、字段、属性、方法等所有信息，因此也可以获取Unity组件信息，获取到组件实例信息，就可以对其做任何读写操作。
同时反射机制，相对于使用其他的hook机制，反射可以为我们带来更强的通用性和版本兼容性。
实现案例
案例前言
由于目前很多游戏考虑到安全性问题，一般都使用相对安全点的“il2cpp”编译模式，因此接下来的案例，也是在il2cpp基础上做分析。
il2cpp是将C# IL（.net平台一种中间语言）转为C++并编译为native，因此这种模式下，反射接口和直接使用C#的反射接口使用方式不太一样，但是大致流程还是差不多。
所以接下来，主要是要找到和整理native模式下，函数的定位以及组合规则。
获取TextMeshProGUI组件内的文本信息
注意：以下有些备注可能不准确，可以作为意会和参考，因为确实有点词穷（理解不够深........）,
另外以是伪代码，着重描述核心的底层接口脉络，详细代码，会放在最后。
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 | // 假定一个TextMeshProGUI实例对象let text_mesh_pro_gui_instance;// 获取进程域// **核心函数：il2cpp_domain_get**let domain = il2cpp_domain_get()// 获取所有程序集。类似C#获取所有动态链接库(.dll)反射信息// **核心函数：il2cpp_domain_get_assemblies**let assmblies = il2cpp_domain_get_assemblies(domain)let assembly_images=[];for(let i=0;i<assmblies.size;i++){ assm = assmblies[i]; // **核心函数：il2cpp_assembly_get_image** images.add(il2cpp_assembly_get_image(assm))}// 获取指定程序集反射image对象// **核心函数：il2cpp_image_get_name**let target_assembly_image = assembly_images .filter(assembly_img=>il2cpp_image_get_name(assembly_img)=="Unity.TextMeshPro.dll") .pop()// 通过C#内限定名，获取对象class反射信息// TextMeshProGUI类型组件限定名是"TMPro.TextMeshProGUI",并属于"Unity.TextMeshPro.dll"程序集// **核心函数：il2cpp_class_from_name**let TextMeshPro_class = il2cpp_class_from_name(target_assembly_image,"TMPro","TextMeshProGUI")// 获取文本字段反射信息// TextMeshProGUI存储文本的字段是“m_text”// **核心函数：il2cpp_class_get_field_from_name**m_text_field = il2cpp_class_get_field_from_name(TextMeshPro_class,"m_text")// 读取字段内容实例，实例是个结构体// **核心函数：il2cpp_field_get_value_object**let str_content_struct = il2cpp_field_get_value_object（m_text_field,text_mesh_pro_gui_instance）;// 读取结构体内字符串内容,这里就是获取最终C版本的字符串// **核心函数：func_il2cpp_string_chars**content_chars = func_il2cpp_string_chars(str_content_struct) |
以上就是读取一个组件，所涉及的核心接口，以及组合方式。
当然不同组件，还会有一些其他接口涉及，但是也是依葫芦画瓢，根据函数名字大概就能推断出什么含义。
应用扩展
既然能获取所有实例对象和信息，并且具备读写能力，那么理论上，可以基于这套思路完成无源码修改游戏，以及基于组件级的脚本点击...............
另外需要提取游戏内资源，此方案也可以绕过大部分加固......
一些想法
这个方案是完全依赖多个关键函数的symbol，目前听说（没实际了解）一些加固厂商，会将这些symbol抹除，如果抹除就通过函数特诊码搜索函数位置，但是这样兼容性有个问题，准确性也是个问题.......
压缩包中相关资源说明
更多il2cpp反射api定义，在il2cpp-api-functions.h。
il2cpp的结构体定义在il2cpp-class.h。
完整源码项目文件是_agent.js
_agent.js中的UnityApi类，封装了一部分反射api。
_agent.js中的Example类是案例：
鸣谢
通过Zygisk-Il2CppDumper源码，偶然间看到相关代码，才获得灵感进一步深挖“反射”这条思路
完整项目源码
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{UCommonUtil} */ static get Api() { if (this.#_self == null) { this.#_self = new UCommonUtil(); } return this.#_self; } /** * 获取il2cpp里的迭代器 * @return {NativePointer} */ GetEmptyIter() { let iter = Memory.alloc(Process.pointerSize); iter.writePointer(NULL); return iter; }}class CommonUtil { static #_self; /** * @return {CommonUtil} */ static get Api() { if (this.#_self == null) { this.#_self = new CommonUtil(); } return this.#_self; } /** * 创建NativeFunction封装，用于少写两行代码，方便使用 * @returns {NativeFunction} */ NewNativeFunction(module, exportName, retType, argTypes) { let ptr = module.findExportByName(exportName); if (ptr == null) { console.error(`没有找到【${exportName}】`); return null; } console.log(`成功找到【${exportName}】`); return new NativeFunction(ptr, retType, argTypes); }}/** * unity il2cpp中的so接口 */class UnityApi { static #_il2cppName = "libil2cpp.so"; static #_self; /** * @type {Module} */ #_il2cppMoudle; #func_il2cpp_get_corlib = null; // class #func_il2cpp_class_from_name = null; #func_il2cpp_class_get_method_from_name = null; #func_il2cpp_class_get_namespace = null; #func_il2cpp_class_get_name = null; #func_il2cpp_class_get_type = null; #func_il2cpp_class_from_type = null; #func_il2cpp_class_get_field_from_name = null; #func_il2cpp_class_get_fields = null; #func_il2cpp_class_get_properties = null; #func_il2cpp_class_get_property_from_name = null; #func_il2cpp_class_get_image = null; // domain #func_il2cpp_domain_get = null; #func_il2cpp_domain_get_assemblies = null; // assembly #func_il2cpp_assembly_get_image = null; // image #func_il2cpp_image_get_name = null; #func_il2cpp_image_get_class_count = null; #func_il2cpp_image_get_class = null; // runtime #func_il2cpp_runtime_invoke = null; // type #func_il2cpp_type_get_type = null; #func_il2cpp_type_get_object = null; #func_il2cpp_type_get_class_or_element_class = null; // field #func_il2cpp_field_get_value_object = null; #func_il2cpp_field_get_name = null; #func_il2cpp_field_get_type = null; // property #func_il2cpp_property_get_get_method = null; #func_il2cpp_property_get_name = null; // object #func_il2cpp_object_get_size = null; #func_il2cpp_object_get_class = null; // string #func_il2cpp_string_chars = null; constructor() { this.#init(); } /** * 由于Unity Il2cpp相关接口，需要在il2cpp处加载后， * 才能正常发现，所以需要先在合适的地方初始化，再后续使用 * @constructor */ static Init() { if (!this.#_self) { this.#_self = new UnityApi(); } } /** * 静态暴露接口 * @returns {UnityApi} */ static get Api() { if (!this.#_self) { throw "UnityApi还未初始化" } return this.#_self; } //-----------------------------------------------------【API】-------------------------------------------------------------// /** * @return {NativePointer} */ il2cpp_get_corlib() { return this.#func_il2cpp_get_corlib(); } /** * 根据类的限定名，获取Type信息 * @param image_p .dll基址 * @param namespace 命名空间 * @param name 类名 * @returns {NativePointer} */ il2cpp_class_from_name(image_p, namespace, name) { let ns = Memory.allocUtf8String(namespace); let className = Memory.allocUtf8String(name); return this.#func_il2cpp_class_from_name(image_p, ns, className); } /** * 通过class获取type * @param {NativePointer} klass * @return {NativePointer} */ il2cpp_class_get_type(klass) { return this.#func_il2cpp_class_get_type(klass); } /** * 反射获取指定方法 * @param {NativePointer} klass class句柄 * @param {string} methodName 指定方法名 * @param {number} argCount 参数个数 * @return {NativePointer} */ il2cpp_class_get_method_from_name(klass, methodName, argCount) { let methodNameP = Memory.allocUtf8String(methodName); return this.#func_il2cpp_class_get_method_from_name(klass, methodNameP, argCount); } /** * 获取class下所有字段 * @param {NativePointer} klass * @return {Generator<*, void, *>} */ * il2cpp_class_get_fields(klass) { let iter = UCommonUtil.Api.GetEmptyIter(); while (true) { let result = this.#func_il2cpp_class_get_fields(klass, iter); if (result.valueOf() == 0) { break; } yield result; } } /** * 获取进程域 * @returns {NativePointer} */ il2cpp_domain_get() { return this.#func_il2cpp_domain_get(); } /** * 获取所有程序集的基址 * @param domain * @return {{size:number,assemblies:any}} .dll数组(const Il2CppAssembly**) */ il2cpp_domain_get_assemblies(domain) { let size = Memory.alloc(4); size.writeInt(0); let assemblies = this.#func_il2cpp_domain_get_assemblies(domain, size); return { size: size.readInt(), assemblies: assemblies } } /** * 获取.dll的句柄 * @param assembly .dll信息指针 * @return {NativePointer} .dll句柄 */ il2cpp_assembly_get_image(assembly) { return this.#func_il2cpp_assembly_get_image(assembly); } /** * 获取image的name * @param {NativePointer} image * @return {string} image的名字 */ il2cpp_image_get_name(image) { let result = this.#func_il2cpp_image_get_name(image); return result.readPointer().readCString(); } /** * 获取.dll下有多少个class * @param {NativePointer} image .dll句柄 * @return {number} class个数 */ il2cpp_image_get_class_count(image) { let result = this.#func_il2cpp_image_get_class_count(image); return result; } /** * 获取class * @param {NativePointer} image * @param {number} index * @return {NativePointer} */ il2cpp_image_get_class(image, index) { return this.#func_il2cpp_image_get_class(image, index); } /** * 通过class获取作用域名 * @param {NativePointer} klass * @return {string}; */ il2cpp_class_get_namespace(klass) { let result = this.#func_il2cpp_class_get_namespace(klass); let ns = ptr(result).readCString(); return ns; } /** * 通过class获取名字 * @param {NativePointer} klass * @return {string} */ il2cpp_class_get_name(klass) { let result = this.#func_il2cpp_class_get_name(klass); return ptr(result).readCString(); } /** * @param {NativePointer} klass * @return {NativePointer} */ il2cpp_class_get_image(klass) { return this.#func_il2cpp_class_get_image(klass); } /** * 反射调用方法 * @param {NativePointer} methodInfo 反射方法对象 * @param {NativePointer} obj 方法所属实例，static为NULL * @param {NativePointer} params 参数数组 * @param {NativePointer} exception 报错 * @return {NativePointer} */ il2cpp_runtime_invoke(methodInfo, obj, params, exception) { return this.#func_il2cpp_runtime_invoke(methodInfo, obj, params, exception); } /** * 获取class的TypeInfo信息 * @param {NativePointer} type * @return {NativePointer} */ il2cpp_class_from_type(type) { return this.#func_il2cpp_class_from_type(type); } /** * @param {NativePointer} klass * @param {string} name * @return {NativePointer} */ il2cpp_class_get_field_from_name(klass, name) { let nameP = Memory.allocUtf8String(name); return this.#func_il2cpp_class_get_field_from_name(klass, nameP); } /** * 读取字段的名字 * @param {NativePointer} field * @return {string} */ il2cpp_field_get_name(field) { let result = this.#func_il2cpp_field_get_name(field); return ptr(result).readCString(); } /** * @param {NativePointer} field * @return {NativePointer} */ il2cpp_field_get_type(field) { return this.#func_il2cpp_field_get_type(field); } /** * 获取class所有属性 * @param {NativePointer} klass * @return {*} */ * il2cpp_class_get_properties(klass) { let iter = UCommonUtil.Api.GetEmptyIter(); while (true) { let result = this.#func_il2cpp_class_get_properties(klass, iter); if (result.valueOf() == 0) { break; } yield result; } } /** * 通过名字，获取class指定属性 * @param {NativePointer} klass * @param {string} name * @return {NativePointer} */ il2cpp_class_get_property_from_name(klass, name) { let nameP = Memory.allocUtf8String(name); return this.#func_il2cpp_class_get_property_from_name(klass, nameP); } /** * @param {NativePointer} type * @return {number} */ il2cpp_type_get_type(type) { return this.#func_il2cpp_type_get_type(type); } /** * 根据反射信息，创建Type对象（即C#中反射的核心对象类） * @param {NativePointer} type * @return {NativePointer} */ il2cpp_type_get_object(type) { return this.#func_il2cpp_type_get_object(type); } /** * @param {NativePointer} type * @return {NativePointer} */ il2cpp_type_get_class_or_element_class(type) { return this.#func_il2cpp_type_get_class_or_element_class(type); } /** * 反射读取字段值 * @param {NativePointer} field * @param {NativePointer} obj * @return {NativePointer} */ il2cpp_field_get_value_object(field, obj) { return this.#func_il2cpp_field_get_value_object(field, obj); } /** * 获取属性的get方法（及读取属性值行为） * @param {NativePointer} prop * @return {NativePointer} */ il2cpp_property_get_get_method(prop) { return this.#func_il2cpp_property_get_get_method(prop); } /** * 获取属性名字 * @param {NativePointer} prop * @return {NativePointer} */ il2cpp_property_get_name(prop) { let result = this.#func_il2cpp_property_get_name(prop); return ptr(result).readCString(); } /** * 获取对象大小 * @param {NativePointer} obj * @return {number} */ il2cpp_object_get_size(obj) { return this.#func_il2cpp_object_get_size(obj); } /** * @param {NativePointer} obj * @return {NativePointer} */ il2cpp_object_get_class(obj) { return this.#func_il2cpp_object_get_class(obj); } /** * @param {NativePointer} str * @return {string} */ func_il2cpp_string_chars(str) { let result = this.#func_il2cpp_string_chars(str); return ptr(result).readUtf16String(); } //-----------------------------------------------------【Attach】-------------------------------------------------------------// /** * @param {InvocationListenerCallbacks} callback */ Attach_il2cpp_get_corlib(callback) { let func = this.#_il2cppMoudle.findExportByName("il2cpp_get_corlib"); Interceptor.attach(func, callback); } /** * @param {InvocationListenerCallbacks} callback */ Attach_il2cpp_class_from_name(callback) { let func = this.#_il2cppMoudle.findExportByName("il2cpp_class_from_name"); Interceptor.attach(func, callback); } /** * 初始化so函数 */ #init() { this.#_il2cppMoudle = Process.findModuleByName(UnityApi.#_il2cppName); if (!this.#_il2cppMoudle) { console.error("未发现il2cppModule"); return; } // ---------------------------------------------------------------------------------// this.#func_il2cpp_get_corlib = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_get_corlib", "pointer", []); // class this.#func_il2cpp_class_from_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_from_name", "pointer", ["pointer", "pointer", "pointer"]); this.#func_il2cpp_class_get_method_from_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_method_from_name", "pointer", ["pointer", "pointer", "int"]); this.#func_il2cpp_class_get_namespace = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_namespace", "pointer", ["pointer"]); this.#func_il2cpp_class_get_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_name", "pointer", ["pointer"]); this.#func_il2cpp_class_get_type = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_type", "pointer", ["pointer"]); this.#func_il2cpp_class_from_type = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_from_type", "pointer", ["pointer"]); this.#func_il2cpp_class_get_field_from_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_field_from_name", "pointer", ["pointer", "pointer"]); this.#func_il2cpp_class_get_fields = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_fields", "pointer", ["pointer", "pointer"]); this.#func_il2cpp_class_get_properties = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_properties", "pointer", ["pointer", "pointer"]); this.#func_il2cpp_class_get_property_from_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_property_from_name", "pointer", ["pointer", "pointer"]); this.#func_il2cpp_object_get_class = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_object_get_class", "pointer", ["pointer"]); this.#func_il2cpp_class_get_image = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_class_get_image", "pointer", ["pointer"]); // domain this.#func_il2cpp_domain_get = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_domain_get", "pointer", []); this.#func_il2cpp_domain_get_assemblies = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_domain_get_assemblies", "pointer", ["pointer", "pointer"]); // assembly this.#func_il2cpp_assembly_get_image = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_assembly_get_image", "pointer", ["pointer"]); // image this.#func_il2cpp_image_get_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_image_get_name", "pointer", ["pointer"]); this.#func_il2cpp_image_get_class_count = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_image_get_class_count", "uint32", ["pointer"]); this.#func_il2cpp_image_get_class = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_image_get_class", "pointer", ["pointer", "uint32"]); // runtime this.#func_il2cpp_runtime_invoke = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_runtime_invoke", "pointer", ["pointer", "pointer", "pointer", "pointer"]); // type this.#func_il2cpp_type_get_type = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_type_get_type", "int", ["pointer"]); this.#func_il2cpp_type_get_object = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_type_get_object", "pointer", ["pointer"]); this.#func_il2cpp_field_get_type = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_field_get_type", "pointer", ["pointer"]); this.#func_il2cpp_type_get_class_or_element_class = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_type_get_class_or_element_class", "pointer", ["pointer"]); // field this.#func_il2cpp_field_get_value_object = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_field_get_value_object", "pointer", ["pointer", "pointer"]); this.#func_il2cpp_field_get_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_field_get_name", "pointer", ["pointer"]); // property this.#func_il2cpp_property_get_get_method = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_property_get_get_method", "pointer", ["pointer"]); this.#func_il2cpp_property_get_name = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_property_get_name", "pointer", ["pointer"]); // object this.#func_il2cpp_object_get_size = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_object_get_size", "uint32", ["pointer"]); // string this.#func_il2cpp_string_chars = CommonUtil.Api.NewNativeFunction(this.#_il2cppMoudle, "il2cpp_string_chars", "pointer", ["pointer"]); // ---------------------------------------------------------------------------------// }}/** * 懒加载包装类 */class Lazy { #_value = null; /** * @type {function ():*} value */ #_lazyValue = null; /** * @param {*} this上下文 * @param {function ():*} value 实例化对象的方法回调 * @return {Lazy} */ static New(context,value) { let lazy = new Lazy(); lazy.Value = value.bind(context); return lazy; } /** * @param {function ():*} value */ set Value(value) { this.#_lazyValue = value; } /** * @return {*} */ get Value() { if (this.#_value == null) { this.#_value = this.#_lazyValue(); } return this.#_value; }}class UMethodInfo { /** * @type {Lazy} */ #_methodInfo = null; /** * @type {UnityApi} */ #_unityApi = UnityApi.Api; /** * @param { * { * kalss:NativePointer, * methodName:string * argCount:number * } * } input */ constructor(input) { this.#_methodInfo = Lazy.New(this,() => { return this.#_unityApi.il2cpp_class_get_method_from_name(input.kalss, input.methodName, input.argCount); }); } /** * * @param {NativePointer} args 参数数组 * @param {NativePointer} obj 实例对象 * @return {(NativePointer | *)} * @constructor */ Invoke(obj, args) { let result = this.#_unityApi.il2cpp_runtime_invoke(this.#_methodInfo.Value, obj, args, NULL); return result; }}class UDomain { static #_self; /** * @type {NativePointer} */ #_domain = null; /** * @type {{size:number,assemblies:any}} */ #_assmblies = null; /** * @type {NativePointer[]} */ #_assemblyImages = null; /** * @type {UnityApi} */ #_unityApi = null; constructor() { this.#_unityApi = UnityApi.Api; this.#LoadDomain(); this.#LoadAssemblies(); this.#LoadAssemblyImages(); } /** * @return {UDomain} */ static get Api() { if (UDomain.#_self == null) { UDomain.#_self = new UDomain(); } return UDomain.#_self; } /** * @return {NativePointer[]} */ get AllAssemblyImages() { return this.#_assemblyImages; } /** * @param {string} name * @return {NativePointer} */ GetAssemblyImageByName(name) { return this.#_assemblyImages .filter(image => this.#_unityApi.il2cpp_image_get_name(image) == name) .pop() .readPointer(); } #LoadDomain() { this.#_domain = this.#_unityApi.il2cpp_domain_get(); } #LoadAssemblies() { this.#_assmblies = this.#_unityApi.il2cpp_domain_get_assemblies(this.#_domain); } #LoadAssemblyImages() { let images = [...Array(this.#_assmblies.size).keys()] .map(value => ptr(this.#_assmblies.assemblies).add(Process.pointerSize * value)) .map(assm => this.#_unityApi.il2cpp_assembly_get_image(assm)); this.#_assemblyImages = images; }}/** * @readonly * @enum {string} */const AssemblyName={ UnityEngine:"UnityEngine.dll", UnityEngineUI:"UnityEngine.UI.dll", UnityTextMeshPro:"Unity.TextMeshPro.dll", UnityEngineCoreModule:"UnityEngine.CoreModule.dll"};class UnityUtil { static #_self = null; /** * @return {UnityUtil} */ static get Api() { if (UnityUtil.#_self == null) { UnityUtil.#_self = new UnityUtil(); } return UnityUtil.#_self; } /** * 获取Class * @param { * { * domain:UDomain, * assemblyName:string, * namespace:string, * klassName:string, * } * } input * @return {NativePointer} */ GetClass(input) { let assemblyImage = input.domain.GetAssemblyImageByName(input.assemblyName); let klass = UnityApi.Api.il2cpp_class_from_name(assemblyImage, input.namespace, input.klassName); return klass; } /** * 获取指定类的Type实例 * @param { * { * klass:NativePointer * } * } input * @return {NativePointer} */ GetTypeObj(input) { let type = UnityApi.Api.il2cpp_class_get_type(input.klass); let typeObj = UnityApi.Api.il2cpp_type_get_object(type); return typeObj; } /** * 反射读取字符串类型字段的值 * @param {NativePointer} field * @param {NativePointer} obj * @return {string} */ ReadFieldWithString(field, obj) { let valueObj = UnityApi.Api.il2cpp_field_get_value_object(field, obj); let valueReal = UnityApi.Api.func_il2cpp_string_chars(valueObj); return valueReal; } /** * 反射读取字符串类型属性值 * @param {NativePointer} property * @param {NativePointer} obj */ ReadPropertyWithString(property, obj) { let getFunc = UnityApi.Api.il2cpp_property_get_get_method(property); let valueObj = UnityApi.Api.il2cpp_runtime_invoke(getFunc, obj, NULL, NULL); let valueReal = UnityApi.Api.func_il2cpp_string_chars(valueObj); return valueReal; }}class ReflectionInfoInput { dllName; namespace; className; constructor(dllName,namespace,className) { this.dllName = dllName; this.namespace = namespace; this.className = className; }}class ReflectionBase { get UApi(){ return UnityApi.Api; } /** * * @return {function(): UDomain} * @constructor */ get Domain(){ return UDomain.Api; }}class UReflectionInfo extends ReflectionBase { /** * @type {ReflectionInfoInput} */ #_input = null; /** * 实例对象 * @type {NativePointer} */ #_instanceObj = null; /** * @type {Lazy} */ #_assemblyImage = null; /** * @type {Lazy} */ #_class = null; /** * @type {Lazy} */ #_type = null; /** * @type {Lazy} */ #_fields = null; /** * @type {Lazy} */ #_properties = null; /** * @param {ReflectionInfoInput | NativePointer} input */ constructor(input) { super(); if (input instanceof ReflectionInfoInput) { this.#_input = input; } if (input instanceof NativePointer) { this.#_instanceObj = input; } this.#LoadInit(); } /** * @return {NativePointer} */ get Class() { return this.#_class.Value; } get Type() { return this.#_type.Value; } get Fields() { return this.#_fields.Value; } get Properties() { return this.#_properties.Value; } PropertyByName(name) { return this.UApi.il2cpp_class_get_property_from_name(this.Class, name); } /** * @param {string} name * @return {NativePointer} */ FieldByName(name) { return this.UApi.il2cpp_class_get_field_from_name(this.Class, name); } /** * @param name 方法名字 * @param argCount 方法个数 * @return {UMethodInfo} */ MethodByName(name, argCount) { return new UMethodInfo({ kalss: this.#_class.Value, methodName: name, argCount: argCount }) } #LoadInit() { this.#Switch({ objNotNull: this.#LoadClassByObj, inputNotNull: this.#LoadClassByName }); this.#LoadAssemblyImage(); this.#LoadType(); this.#LoadFields(); this.#LoadProperties(); } /** * @param { * { * objNotNull:function ():*, * inputNotNull:function ():* * } * } input * @return {*} */ #Switch(input) { if (this.#_instanceObj != null) { return input.objNotNull.call(this); } if (this.#_input != null) { return input.inputNotNull.call(this); } } #LoadAssemblyImage() { this.#_assemblyImage = this.#Switch({ objNotNull: () => Lazy.New(this, () => this.UApi.il2cpp_class_get_image(this.Class)), inputNotNull: () => Lazy.New(this, () => this.Domain.GetAssemblyImageByName(this.#_input.dllName)), }); } #LoadClassByObj() { this.#_class = Lazy.New(this, () => this.UApi.il2cpp_object_get_class(this.#_instanceObj)); } #LoadClassByName() { this.#_class = Lazy.New(this, () => this.UApi.il2cpp_class_from_name(this.#_assemblyImage.Value, this.#_input.namespace, this.#_input.className) ); } #LoadType() { this.#_type = Lazy.New(this, () => { let type = this.UApi.il2cpp_class_get_type(this.Class); return this.UApi.il2cpp_type_get_object(type); }); } #LoadFields() { this.#_fields = Lazy.New(this, () => [...this.UApi.il2cpp_class_get_fields(this.Class)]); } #LoadProperties() { this.#_properties = Lazy.New(this, () => [...this.UApi.il2cpp_class_get_properties(this.Class)]); }}/* 类型反射信息定义 （在此处定义好类型的反射信息，需要某类型反射信息可方便使用） */class UTypeDefinition { static #_self; #_u_object = new UReflectionInfo(new ReflectionInfoInput( AssemblyName.UnityEngine, "UnityEngine", "Object")); #_u_Behaviour = new UReflectionInfo(new ReflectionInfoInput( AssemblyName.UnityEngine, "UnityEngine", "Behaviour" )); #_u_UI_Text = new UReflectionInfo(new ReflectionInfoInput( AssemblyName.UnityEngineUI, "UnityEngine.UI", "Text" )); #_u_TextMeshProUGUI = new UReflectionInfo(new ReflectionInfoInput( AssemblyName.UnityTextMeshPro, "TMPro", "TextMeshProUGUI" )); #_u_Resources = new UReflectionInfo(new ReflectionInfoInput( AssemblyName.UnityEngineCoreModule, "UnityEngine", "Resources" )); /** * @return {UTypeDefinition} */ static get Api() { if (UTypeDefinition.#_self == null) { UTypeDefinition.#_self = new UTypeDefinition(); } return UTypeDefinition.#_self; } /** * @return {UReflectionInfo} */ get U_Object() { return this.#_u_object; } /** * @return {UReflectionInfo} */ get U_Behaviour() { return this.#_u_Behaviour; } /** * @return {UReflectionInfo} */ get U_UI_Text() { return this.#_u_UI_Text; } /** * @return {UReflectionInfo} */ get U_TextMeshProUGUI() { return this.#_u_TextMeshProUGUI; } /** * @return {UReflectionInfo} */ get U_Resources() { return this.#_u_Resources; }}class UObject { /** * @type {Domain} */ #_domain = UDomain.Api; /** * @type {UnityApi} */ #_unityApi = UnityApi.Api; /** * @type {NativePointer} */ #_obj = null; /** * 实例对象的class * @type {UReflectionInfo} */ #_instanceReflection = null; /** * @param { * { * obj:NativePointer, * } * } input */ constructor(input) { this.#_obj = input.obj; this.#LoadInstanceKlass(input.obj); } /** * 获取组件自定义ID名字 * @return {string} */ get IDName() { let property = this.#_unityApi.il2cpp_class_get_property_from_name(UTypeDefinition.Api.U_Object.Class, "name"); let name = UnityUtil.Api.ReadPropertyWithString(property, this.#_obj); return name; } /** * 获取类型限定名字 * @return {string} */ get TypeName() { let namespace = this.#_unityApi.il2cpp_class_get_namespace(this.#_instanceReflection.Class); let className = this.#_unityApi.il2cpp_class_get_name(this.#_instanceReflection.Class); return `${namespace}.${className}`; } /** * @return {UReflectionInfo} */ get InstanceReflection() { return this.#_instanceReflection; } /** * @return {UnityApi} */ get UApi() { return this.#_unityApi; } /** * @return {Domain} */ get Domain() { return this.#_domain; } /** * @return {NativePointer} */ get ObjInstance() { return this.#_obj; } #LoadInstanceKlass() { this.#_instanceReflection = new UReflectionInfo(this.#_obj); }}class UBehavior extends UObject { /** * * @param { * { * obj:NativePointer * } * } input */ constructor(input) { super(input); }}class UTextMeshProUGUI extends UObject { /** * @param { * { * obj:NativePointer * } * } input */ constructor(input) { super(input); } /** * @return {string} */ get TextContent() { let field = UTypeDefinition.Api.U_TextMeshProUGUI.FieldByName("m_text"); let content = UnityUtil.Api.ReadFieldWithString(field, this.ObjInstance); return content; }}class UServiceBase { /** * @type {UDomain} */ #_domain = UDomain.Api; /** * @type {UnityApi} */ #_UApi = UnityApi.Api; get UApi() { return this.#_UApi; } get Domain() { return this.#_domain; }}class UIText extends UObject { /** * @param { * { * obj:NativePointer, * } * } input */ constructor(input) { super(input); } /** * @return {string} */ get TextContent(){ let property = UTypeDefinition.Api.U_UI_Text.PropertyByName("text"); let content = UnityUtil.Api.ReadPropertyWithString(property, this.ObjInstance); return content; }}/** * 搜索功能封装 */class UFind extends UServiceBase { /** * @type {UMethodInfo} */ #_findObjectsOfType = null constructor() { super(); this.#LoadFindObjectsOfType(); } /** * 获取当前界面的所有控件元素 * @return {UBehavior[]} */ GetCurrentAllComponent() { let components = this.#FindObjectsOfType(UTypeDefinition.Api.U_Behaviour.Type); let behaviors = components .map(obj => new UBehavior({ obj: obj })); // for (const behavior of behaviors) { // console.log(`behavior.TypeName:${behavior.TypeName}`); // } // // console.log("----------------------") // // for (let behavior of behaviors) { // console.log(`ID Name:${behavior.IDName}--`); // } return behaviors; } /** * @return {UTextMeshProUGUI[]} */ GetCurrentComponentByTextMeshProUGUI() { let objs = this.#FindObjectsOfType(UTypeDefinition.Api.U_TextMeshProUGUI.Type); let tmps = objs.map(value => new UTextMeshProUGUI({ obj: value })); // console.log(`tmps个数：${tmps.length}`) // // for (let elem of tmps) { // console.log(`tmp text:${elem.TextContent}`); // } return tmps; } /** * @return {UIText[]} */ GetCurrentComponentByText() { let objs = this.#FindObjectsOfType(UTypeDefinition.Api.U_UI_Text.Type); let texts = objs.map(value => new UIText({ obj: value })); // console.log(`UI_Text个数：${texts.length}`) // // for (let elem of texts) { // console.log(`ui text:${elem.TextContent}`); // } return texts; } /** * 获取指定类型的所有子类元素 * @param {NativePointer} obj 实例对象 * @param {NativePointer} type 类型Type信息 * @return {NativePointer[]} */ #FindObjectsOfType(type) { // 构建装参数指针的数组 let argArr = Memory.alloc(Process.pointerSize); argArr.writePointer(type); let result = this.#_findObjectsOfType.Invoke(NULL, argArr); // 读取数组长度 let length = result.add(Process.pointerSize * 3).readInt(); // 读取元素数组头 let elemArr = result.add(Process.pointerSize * 4); let objArr = [...Array(length).keys()] // 读取数组元素 .map(value => ptr(elemArr).add(Process.pointerSize * value).readPointer()); return objArr; } #LoadFindObjectsOfType() { this.#_findObjectsOfType= UTypeDefinition.Api.U_Resources.MethodByName("FindObjectsOfTypeAll", 1); }}class AndroidApplicationContext { static #_self = null; #_context = null; constructor() { this.#LoadContext(); } /** * @return {AndroidApplicationContext} */ static get Api() { if (AndroidApplicationContext.#_self == null) { AndroidApplicationContext.#_self = new AndroidApplicationContext(); } return AndroidApplicationContext.#_self; } /** * 获取路径结果：/data/app/包名+随机数/xx.apk * @return {string} */ get getPackageCodePath() { return this.#_context.getPackageCodePath().value; } /** * @return {string} */ get nativeLibraryDir() { return this.#_context.getApplicationInfo().nativeLibraryDir.value; } #LoadContext() { let activityThread = Java.use("android.app.ActivityThread"); let currentApplication = activityThread.currentApplication(); this.#_context = currentApplication.getApplicationContext(); }}class AndroidFile { #_file = null; #_absPath = null; constructor(absPath) { this.#_absPath = absPath; let fileClass = Java.use("java.io.File"); this.#_file = fileClass.$new(absPath); } /** * @return {boolean} */ exists() { return this.#_file.exists(); }}class UnityEngine { /** * @type {Find} */ #_find; /** * 判断是否是Unity引擎的游戏 * @param {function (boolean)} callback */ IsUnity(callback) { // 此处如果不使用延迟加载，会很大概率出现无法找到context setTimeout(() => { // 直接读取apk文件夹是否有libil2cpp.so判断是否unity游戏 let nativeLibraryDir = AndroidApplicationContext.Api.nativeLibraryDir; let file = new AndroidFile(`${nativeLibraryDir}/libil2cpp.so`); callback(file.exists()); }, 1000); } /** * Unity引擎初始化 * @param {function (UnityEngine)} onComplete 初始化完成后回调 */ Init(onComplete) { let that = this; let modules = Process.enumerateModules(); let haveIl2Cpp = modules.find(value => value.name == "libil2cpp.so"); // 先遍历内存，是否有il2cpp.so，没有就hook dlopen if (haveIl2Cpp) { this.#Load(onComplete); } else { // hook so加载节点 AndroidApi.Api.AttachDlopen({ onEnter(args) { let soPath = args[0].readCString(); // 判断加载文件是否存在libil2cpp.so，如果存在，接下来hook该so相关东西 this.haveIl2cpp = soPath.endsWith("libil2cpp.so"); }, onLeave(rv) { if (!this.haveIl2cpp) return; // 发现il2cpp.so加载，延迟一小会再加载，避免so无法找到 setTimeout(() => { that.#Load(onComplete); }, 2000); } }); } } /** * @return {UFind} */ get Find() { return this.#_find; } #Load(onComplete) { UnityApi.Init(); this.#_find = new UFind(); onComplete(this); }}class EngineManager { /** * @return {UnityEngine} */ static GetUnityEngine(){ return new UnityEngine(); }}// 初始化成功后，在frida cli中调用样例// Example.Print_CurrentAllComponent()// Example.Print_CurrentComponentByTextMeshProUGUI()// Example.Print_CurrentComponentByText()class Example { static #_unityEngine = null; /** * 方便明亮行调用，所以此处设置一个静态属性 * @return {UnityEngine} */ static get UnityEngine() { return Example.#_unityEngine; } /** * 初始化成功后，在frida cli中调用样例 * Example.Print_CurrentAllComponent() */ static Print_CurrentAllComponent(){ let uBehaviors = Example.UnityEngine.Find.GetCurrentAllComponent(); for (let item of uBehaviors) { console.log(`组件类型名字：${item.TypeName}---组件ID名：${item.IDName}`); } console.log(`Behavior子类个数：${uBehaviors.length}`); } /** * 初始化成功后，在frida cli中调用样例 * Example.Print_CurrentComponentByTextMeshProUGUI() */ static Print_CurrentComponentByTextMeshProUGUI(){ let uTextMeshProUGUIS = Example.UnityEngine.Find.GetCurrentComponentByTextMeshProUGUI(); for (let item of uTextMeshProUGUIS) { console.log(`TextMeshProUGUI文本内容:【${item.TextContent}】`); } console.log(`TextMeshProUGUI子类个数：${uTextMeshProUGUIS.length}`); } /** * 初始化成功后，在frida cli中调用样例 * Example.Print_CurrentComponentByText() */ static Print_CurrentComponentByText(){ let uiTexts = Example.UnityEngine.Find.GetCurrentComponentByText(); for (let item of uiTexts) { console.log(`Text组件内容：【${item.TextContent}】`); } console.log(`UIText子类个数：${uiTexts.length}`); } Entry() { // 使用样例 let unityEngine = EngineManager.GetUnityEngine(); unityEngine.IsUnity(isUnity=>{ if (!isUnity) { console.error("此游戏非Unity引擎游戏"); return ; } console.log("此游戏是Unity引擎游戏"); unityEngine.Init(engine => { console.log("初始化成功！！"); Example.#_unityEngine = engine; }); }); }}/** * 编译脚本入口。 * 所有js脚本，全部自动编译整合进入"_agent.js"。 */function main(){ console.log("frida main代码快进入执行了"); Java.perform(() => { console.log("frida perform代码快进入执行了"); if (!Java.available) { console.log("Frida服务没有启动，取消执行"); } let example = new Example(); example.Entry(); });}main(); |
相关源码资源下载链接
百度网盘：
1 2 | 链接：https://pan.baidu.com/s/11VzgG8qd2WcwZAT-U24ANQ 提取码：veew |
[CTF入门培训]顶尖高校博士及硕士团队亲授《30小时教你玩转CTF》，视频+靶场+题目！助力进入CTF世界
最后于 2022-7-14 19:03
被憨豆爆发编辑
，原因： 调整标题
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可能是版本不兼容，这个方案也不是百分百兼容所有版本，不同版本引擎有一点细微调整。 没记错的话，我当时测试用的2021。 |
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建议用unity写个demo对比看下，太久了确实记不太清清楚 |
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通过CodeRegistration和MetadataRegistration倒是可以获取到methodPointer，但是如果不能获取到不同泛型的这个方法的MethodInfo，执行这个方法会直接闪退，MethodInfo->methodDefinition要和对应的泛型对应才能正确执行，如果不能通反射获取泛型MethodInfo，那Unity这错误有点低级啊。 |
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终于搞定泛型方法调用，要通过反射调用MakeGenericMethod。 |
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哦~感谢佬分享经验 奶心奶心~~~ |
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老哥，最后调用MakeGenericMethod的时候参数是怎么构建的，我也frida一直报错 |
