├── .gitignore ├── LICENSE.md ├── README.md ├── src ├── android │ ├── .gitignore │ ├── app │ │ ├── .gitignore │ │ ├── build.gradle │ │ ├── jni │ │ │ ├── NativeTest.c │ │ │ └── xmake.lua │ │ ├── proguard-rules.pro │ │ └── src │ │ │ ├── androidTest │ │ │ └── java │ │ │ │ └── byopen │ │ │ │ └── sample │ │ │ │ └── ExampleInstrumentedTest.java │ │ │ ├── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── java │ │ │ │ └── byopen │ │ │ │ │ └── sample │ │ │ │ │ ├── MainActivity.java │ │ │ │ │ └── NativeTest.java │ │ │ └── res │ │ │ │ ├── drawable-v24 │ │ │ │ └── ic_launcher_foreground.xml │ │ │ │ ├── drawable │ │ │ │ └── ic_launcher_background.xml │ │ │ │ ├── layout │ │ │ │ └── activity_main.xml │ │ │ │ ├── mipmap-anydpi-v26 │ │ │ │ ├── ic_launcher.xml │ │ │ │ └── ic_launcher_round.xml │ │ │ │ ├── mipmap-hdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ │ ├── mipmap-mdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ │ ├── mipmap-xhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ │ ├── mipmap-xxhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ │ ├── mipmap-xxxhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ │ └── values │ │ │ │ ├── colors.xml │ │ │ │ ├── strings.xml │ │ │ │ └── styles.xml │ │ │ └── test │ │ │ └── java │ │ │ └── byopen │ │ │ └── sample │ │ │ └── ExampleUnitTest.java │ ├── build.gradle │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ ├── gradle-wrapper.jar │ │ │ └── gradle-wrapper.properties │ ├── gradlew │ ├── gradlew.bat │ ├── lib │ │ ├── .gitignore │ │ ├── build.gradle │ │ ├── consumer-rules.pro │ │ ├── proguard-rules.pro │ │ └── src │ │ │ ├── androidTest │ │ │ └── java │ │ │ │ └── dyopen │ │ │ │ └── lib │ │ │ │ └── ExampleInstrumentedTest.java │ │ │ ├── main │ │ │ ├── AndroidManifest.xml │ │ │ └── java │ │ │ │ └── dyopen │ │ │ │ └── lib │ │ │ │ └── SystemLoader.java │ │ │ └── test │ │ │ └── java │ │ │ └── dyopen │ │ │ └── lib │ │ │ └── ExampleUnitTest.java │ └── settings.gradle ├── demo │ ├── demo.c │ └── xmake.lua └── native │ ├── byopen.h │ ├── byopen_android.c │ ├── byopen_macho.c │ ├── prefix.h │ └── xmake.lua └── xmake.lua /.gitignore: -------------------------------------------------------------------------------- 1 | # build cache 2 | .xmake 3 | .gradle 4 | build/ 5 | 6 | # MacOS cache 7 | .DS_Store 8 | 9 | # Other cache 10 | .idea 11 | local.properties 12 | 13 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. 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2 |

dyOpen

3 |

A dlopen library that bypasses mobile system limitation

4 |
5 | 6 | ## 简介 7 | 8 | byOpen是一个绕过移动端系统限制的增强版dlfunctions库。 9 | 10 | ## 支持特性 11 | 12 | ### Android 13 | 14 | 支持App中加载和使用Android系统库接口（即使maps中还没有被加载也支持）。 15 | 16 | Android 7以上dlopen, System.load都是被限制调用的，虽然目前网上有[Nougat_dlfunctions](https://github.com/avs333/Nougat_dlfunctions)等库通过从maps中找so库来绕过加载限制。 17 | 18 | 不过对于app中还没被加载到maps的so库，这种方式就不行了。 19 | 20 | 而byOpen不仅支持fake dlopen方式从maps加载，还可以将还没加载到maps的so库绕过系统限制强行加载进来使用，实现更加通用化得dlopen。 21 | 22 | 注：目前的实现方式理论上还是比较通用的，至少我这Android 10上测试ok，但还没完整详细测试过，是否使用请自行评估。 23 | 24 | #### 相关原理 25 | 26 | 具体实现原理还是比较简单的，主要还是借鉴了[一种绕过Android P对非SDK接口限制的简单方法](http://weishu.me/2018/06/07/free-reflection-above-android-p/)的思想和实现方式。 27 | 28 | 虽然这篇文章中主要目的是为了绕过hide api，不过它里面使用的将自己假装成系统调用的方式，一样可以用到`System.loadLibrary`上去，让系统以为是系统自身在调用`System.loadLibrary` 29 | 30 | 从而绕过Android N的classloader-namespace限制，将系统/system/lib中任意so库加载到maps中，然后再通过fake dlopen的方式去dlsym。 31 | 32 | #### 增强版fake dlopen 33 | 34 | 关于fake dlopen的方式实现，网上已有很多实现，比如： 35 | 36 | * [Nougat_dlfunctions](https://github.com/avs333/Nougat_dlfunctions) 37 | * [Enhanced_dlfunctions](https://github.com/turing-technician/Enhanced_dlfunctions) 38 | 39 | byOpen参考了里面的实现，重新实现了一遍，并且做了一些小改进： 40 | 41 | * 不在/proc/self/maps中的系统库，也能绕过限制强行加载进来使用 42 | * 除了从.dynsym中检索符号，还支持从.symtab中检索符号（参考：Enhanced_dlfunctions，顺带修复了里面的一些bug） 43 | * 整个dlopen过程只有一次malloc分配（省去整个符号表的内存分配和copy） 44 | 45 | #### Android例子 46 | 47 | Android相关测试App例子在：[Android Sample](https://github.com/hack0z/byOpen/tree/master/src/android) 48 | 49 | 注：目前自带的App测试例子里面的系统库我写死了，有些系统版本上有可能不存在，请先改成用户自己的库和符号名，再编译测试 50 | 51 | ```java 52 | public class MainActivity extends AppCompatActivity { 53 | private static final String SYSTEM_LIBRARY = "curl"; 54 | private static final String SYMBOL_NAME = "curl_version"; 55 | ``` 56 | 57 | 除了Native版本dlopen接口，byOpen额外提供了java版本的[System.loadLibrary](https://github.com/hack0z/byOpen/blob/master/src/android/lib/src/main/java/dyopen/lib/SystemLoader.java)接口在java层直接绕过系统库加载。 58 | 59 | 关键代码如下： 60 | 61 | ```java 62 | static public boolean loadLibrary(String libraryName) { 63 | Method forName = Class.class.getDeclaredMethod("forName", String.class); 64 | Method getDeclaredMethod = Class.class.getDeclaredMethod("getDeclaredMethod", String.class, Class[].class); 65 | Class systemClass = (Class) forName.invoke(null, "java.lang.System"); 66 | Method loadLibrary = (Method) getDeclaredMethod.invoke(systemClass, "loadLibrary", new Class[]{String.class}); 67 | loadLibrary.invoke(systemClass, libraryName); 68 | } 69 | ``` 70 | 71 | 而native版本的[dlopen_android.c](https://github.com/hack0z/byOpen/blob/master/src/native/byopen_android.c)实现中，我将这段绕过的系统加载的方式，通过jni重新实现了一遍，然后和fake dlopen无缝结合到了一起。 72 | 73 | ### iOS 74 | 75 | 虽然ios可以直接使用dlopen，但是审核上会有风险，苹果有可能会对提交AppStore的app扫描相关dlopen/dlsym等调用，来判断是否存在一些敏感的私有调用。 76 | 77 | 为了在通过调用一些私有接口的时候避免被苹果检测到，byOpen也通过自己实现dlopen/dlsym直接从已经加载进来的images列表里面直接查找对应symbol地址来调用。 78 | 79 | 当然，为了更加安全，相关调用的库符号硬编码字符串等，用户可以自行做层变换加密，不要直接编译进app。 80 | 81 | ## 接口用法 82 | 83 | 相关静态库和接口在：[dlopen.h](https://github.com/hack0z/byOpen/blob/master/src/native/byopen.h) 84 | 85 | 相关使用方式跟原生dlopen完全相同： 86 | 87 | ```c 88 | typedef by_char_t const* (*curl_version_t)(); 89 | by_pointer_t handle = by_dlopen("libcurl.so", BY_RTLD_LAZY); 90 | if (handle) 91 | { 92 | by_pointer_t addr = by_dlsym(handle, "curl_version"); 93 | if (addr) 94 | { 95 | curl_version_t curl_version = (curl_version_t)addr; 96 | by_print("curl_version: %s", curl_version()); 97 | } 98 | by_dlclose(handle); 99 | } 100 | ``` 101 | 102 | ## 编译 103 | 104 | 编译需要先安装：[xmake](https://github.com/xmake-io/xmake) 105 | 106 | ### Android 107 | 108 | #### 直接编译库 109 | 110 | ```console 111 | $ xmake f -p android --ndk=~/file/android-ndk-r20b 112 | $ xmake 113 | ``` 114 | 115 | #### 通过gradle编译测试Apk 116 | 117 | ```console 118 | $ cd src/android 119 | $ ./gradlew app:assembleDebug 120 | ``` 121 | 122 | #### 通过xmake直接编译apk 123 | 124 | ```console 125 | $ xmake apk_build 126 | ``` 127 | 128 | #### 通过xmake直接安装测试apk 129 | 130 | ```console 131 | $ xmake apk_test 132 | ``` 133 | 134 | ### iOS 135 | 136 | #### 直接编译库 137 | 138 | ```console 139 | $ xmake f -p iphoneos -a [armv7|arm64] 140 | $ xmake 141 | ``` 142 | 143 | ### MacOS 144 | 145 | 我们也可以在macOS下编译测试，也是支持的： 146 | 147 | ```console 148 | $ xmake 149 | $ xmake run 150 | ``` 151 | -------------------------------------------------------------------------------- /src/android/.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | .cxx 15 | -------------------------------------------------------------------------------- /src/android/app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | libs 3 | -------------------------------------------------------------------------------- /src/android/app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'org.tboox.gradle-xmake-plugin' version '1.1.3' 3 | } 4 | apply plugin: 'com.android.application' 5 | 6 | android { 7 | compileSdkVersion 29 8 | 9 | defaultConfig { 10 | applicationId "byopen.sample" 11 | minSdkVersion 19 12 | targetSdkVersion 29 13 | versionCode 1 14 | versionName "1.0" 15 | 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | 18 | ndk { 19 | abiFilters "armeabi-v7a", "arm64-v8a" 20 | } 21 | } 22 | 23 | buildTypes { 24 | release { 25 | minifyEnabled false 26 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 27 | } 28 | } 29 | 30 | externalNativeBuild { 31 | xmake { 32 | logLevel "warning" 33 | path "../../../xmake.lua" 34 | //buildMode "minsizerel" 35 | buildMode "debug" 36 | } 37 | } 38 | } 39 | 40 | dependencies { 41 | implementation fileTree(dir: "libs", include: ["*.jar"]) 42 | implementation 'androidx.appcompat:appcompat:1.1.0' 43 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3' 44 | implementation project(path: ':lib') 45 | testImplementation 'junit:junit:4.12' 46 | androidTestImplementation 'androidx.test.ext:junit:1.1.1' 47 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' 48 | 49 | } 50 | -------------------------------------------------------------------------------- /src/android/app/jni/NativeTest.c: -------------------------------------------------------------------------------- 1 | /*!A dlopen library that bypasses mobile system limitation 2 | * 3 | * Licensed under the Apache License, Version 2.0 (the "License"); 4 | * you may not use this file except in compliance with the License. 5 | * You may obtain a copy of the License at 6 | * 7 | * http://www.apache.org/licenses/LICENSE-2.0 8 | * 9 | * Unless required by applicable law or agreed to in writing, software 10 | * distributed under the License is distributed on an "AS IS" BASIS, 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | * See the License for the specific language governing permissions and 13 | * limitations under the License. 14 | * 15 | * Copyright (C) 2020-present, TBOOX Open Source Group. 16 | * 17 | * @author ruki 18 | * @file NativeTest.c 19 | * 20 | */ 21 | 22 | /* ////////////////////////////////////////////////////////////////////////////////////// 23 | * includes 24 | */ 25 | #include "byopen.h" 26 | 27 | /* ////////////////////////////////////////////////////////////////////////////////////// 28 | * declaration 29 | */ 30 | by_void_t by_jni_javavm_set(JavaVM* jvm, by_int_t jversion); 31 | 32 | /* ////////////////////////////////////////////////////////////////////////////////////// 33 | * interfaces 34 | */ 35 | JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* jvm, by_pointer_t reserved) 36 | { 37 | by_jni_javavm_set(jvm, JNI_VERSION_1_4); 38 | return JNI_VERSION_1_4; 39 | } 40 | 41 | JNIEXPORT jboolean Java_byopen_sample_NativeTest_loadLibrary(JNIEnv* env, jclass jthis, jstring libraryName, jstring symbolName) 42 | { 43 | by_bool_t ok = by_false; 44 | by_char_t const* libraryName_cstr = (*env)->GetStringUTFChars(env, libraryName, by_null); 45 | by_char_t const* symbolName_cstr = (*env)->GetStringUTFChars(env, symbolName, by_null); 46 | if (libraryName_cstr && symbolName_cstr) 47 | { 48 | by_pointer_t handle = by_dlopen(libraryName_cstr, BY_RTLD_LAZY); 49 | if (handle) 50 | { 51 | by_pointer_t addr = by_dlsym(handle, symbolName_cstr); 52 | if (addr) 53 | { 54 | #if 0 55 | // test libcurl/curl_version() 56 | typedef char* (*func_t)(); 57 | func_t func = (func_t)addr; 58 | by_trace("curl_version: %s", func()); 59 | #endif 60 | 61 | // load ok 62 | ok = by_true; 63 | } 64 | by_dlclose(handle); 65 | } 66 | (*env)->ReleaseStringUTFChars(env, libraryName, libraryName_cstr); 67 | (*env)->ReleaseStringUTFChars(env, symbolName, symbolName_cstr); 68 | } 69 | return ok; 70 | } 71 | JNIEXPORT jboolean Java_byopen_sample_NativeTest_validFromMaps(JNIEnv* env, jclass jthis, jstring libraryName) 72 | { 73 | by_bool_t found = by_false; 74 | by_char_t const* libraryName_cstr = (*env)->GetStringUTFChars(env, libraryName, by_null); 75 | if (libraryName_cstr) 76 | { 77 | FILE* f = fopen("/proc/self/maps", "r"); 78 | if (f) 79 | { 80 | char line[512]; 81 | while (fgets(line, sizeof(line), f)) 82 | { 83 | if (strstr(line, libraryName_cstr)) 84 | { 85 | found = by_true; 86 | break; 87 | } 88 | } 89 | fclose(f); 90 | } 91 | (*env)->ReleaseStringUTFChars(env, libraryName, libraryName_cstr); 92 | } 93 | return found; 94 | } 95 | -------------------------------------------------------------------------------- /src/android/app/jni/xmake.lua: -------------------------------------------------------------------------------- 1 | target("testjni") 2 | set_kind("shared") 3 | add_deps("byopen") 4 | add_files("*.c") 5 | 6 | -------------------------------------------------------------------------------- /src/android/app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile -------------------------------------------------------------------------------- /src/android/app/src/androidTest/java/byopen/sample/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package byopen.sample; 2 | 3 | import android.content.Context; 4 | 5 | import androidx.test.platform.app.InstrumentationRegistry; 6 | import androidx.test.ext.junit.runners.AndroidJUnit4; 7 | 8 | import org.junit.Test; 9 | import org.junit.runner.RunWith; 10 | 11 | import static org.junit.Assert.*; 12 | 13 | /** 14 | * Instrumented test, which will execute on an Android device. 15 | * 16 | * @see Testing documentation 17 | */ 18 | @RunWith(AndroidJUnit4.class) 19 | public class ExampleInstrumentedTest { 20 | @Test 21 | public void useAppContext() { 22 | // Context of the app under test. 23 | Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext(); 24 | assertEquals("byopen.sample", appContext.getPackageName()); 25 | } 26 | } -------------------------------------------------------------------------------- /src/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /src/android/app/src/main/java/byopen/sample/MainActivity.java: -------------------------------------------------------------------------------- 1 | package byopen.sample; 2 | 3 | import androidx.appcompat.app.AppCompatActivity; 4 | 5 | import android.os.Bundle; 6 | import android.util.Log; 7 | import android.view.View; 8 | import android.widget.Button; 9 | 10 | import dyopen.lib.SystemLoader; 11 | 12 | public class MainActivity extends AppCompatActivity { 13 | 14 | private static final String TAG = "byOpen"; 15 | private static final String SYSTEM_LIBRARY = "curl"; 16 | private static final String SYMBOL_NAME = "curl_version"; 17 | 18 | @Override 19 | protected void onCreate(Bundle savedInstanceState) { 20 | super.onCreate(savedInstanceState); 21 | setContentView(R.layout.activity_main); 22 | 23 | final Button origin_loadLibraryBtn = (Button) findViewById(R.id.origin_loadLibrary); 24 | origin_loadLibraryBtn.setOnClickListener(new View.OnClickListener() { 25 | @Override 26 | public void onClick(View v) { 27 | try { 28 | System.loadLibrary(SYSTEM_LIBRARY); 29 | if (NativeTest.validFromMaps(SYSTEM_LIBRARY)) { 30 | origin_loadLibraryBtn.setText("load ok!"); 31 | } else { 32 | origin_loadLibraryBtn.setText("load failed!"); 33 | } 34 | } catch (Throwable e) { 35 | origin_loadLibraryBtn.setText("load failed!"); 36 | } 37 | } 38 | }); 39 | 40 | final Button byopen_loadLibraryBtn = (Button) findViewById(R.id.byopen_loadLibrary); 41 | byopen_loadLibraryBtn.setOnClickListener(new View.OnClickListener() { 42 | @Override 43 | public void onClick(View v) { 44 | if (SystemLoader.loadLibrary(SYSTEM_LIBRARY) && NativeTest.validFromMaps(SYSTEM_LIBRARY)) { 45 | byopen_loadLibraryBtn.setText("load ok!"); 46 | } else { 47 | byopen_loadLibraryBtn.setText("load failed!"); 48 | } 49 | } 50 | }); 51 | 52 | final Button dlopenBtn = (Button) findViewById(R.id.byopen_dlopen); 53 | dlopenBtn.setOnClickListener(new View.OnClickListener() { 54 | @Override 55 | public void onClick(View v) { 56 | if (NativeTest.loadLibrary(SYSTEM_LIBRARY, SYMBOL_NAME) && NativeTest.validFromMaps(SYSTEM_LIBRARY)) { 57 | dlopenBtn.setText("load ok!"); 58 | } else { 59 | dlopenBtn.setText("load failed!"); 60 | } 61 | } 62 | }); 63 | 64 | final Button validBtn = (Button) findViewById(R.id.valid_from_maps); 65 | validBtn.setOnClickListener(new View.OnClickListener() { 66 | @Override 67 | public void onClick(View v) { 68 | if (NativeTest.validFromMaps(SYSTEM_LIBRARY)) { 69 | validBtn.setText("valid ok!"); 70 | } else { 71 | validBtn.setText("valid failed!"); 72 | } 73 | } 74 | }); 75 | } 76 | } -------------------------------------------------------------------------------- /src/android/app/src/main/java/byopen/sample/NativeTest.java: -------------------------------------------------------------------------------- 1 | package byopen.sample; 2 | 3 | public class NativeTest { 4 | static { 5 | System.loadLibrary("testjni"); 6 | } 7 | public static native boolean loadLibrary(String libraryName, String symbolName); 8 | public static native boolean validFromMaps(String libraryName); 9 | 10 | } 11 | -------------------------------------------------------------------------------- /src/android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /src/android/app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /src/android/app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 15 | 16 |