使用JVMTI实现SpringBoot的jar加密,防止反编译

// c++加密头文件
#include <jni.h>
#ifndef _Included_com_cxp_demo_encrypt_ByteCodeEncryptor
#define _Included_com_cxp_demo_encrypt_ByteCodeEncryptor
#ifdef __cplusplus
extern "C"
{
#endif
    JNIEXPORT jbyteArray JNICALL Java_com_cxp_demo_encrypt_ByteCodeEncryptor_encrypt(JNIEnv *, jclass, jbyteArray);
#ifdef __cplusplus
}
#endif
#endif
#ifndef CONST_HEADER_H_  
#define CONST_HEADER_H_   
const int k = 4;
const int compare_length = 18;
const char* package_prefix= "com/cxp/demo";
#endif

// c++加密解密源码
#include <iostream>
#include <jni.h>
#include <jvmti.h>
#include <jni_md.h>
#include "demo_bytecode_encryptor.h"
void encode(char *str)
{
    unsigned int m = strlen(str);
    for (int i = 0; i < m; i++)
    {
        str[i] = str[i] + k;
    }
}
void decode(char *str)
{
    unsigned int m = strlen(str);
    for (int i = 0; i < m; i++)
    {
        str[i] = str[i] - k;
    }
}
extern"C" JNIEXPORT jbyteArray JNICALL Java_com_cxp_demo_encrypt_ByteCodeEncryptor_encrypt(JNIEnv * env, jclass cla, jbyteArray text)
{
    char* dst = (char*)env->GetByteArrayElements(text, 0);
    encode(dst);
    env->SetByteArrayRegion(text, 0, strlen(dst), (jbyte *)dst);
    return text;
}
void JNICALL ClassDecryptHook(
    jvmtiEnv *jvmti_env,
    JNIEnv* jni_env,
    jclass class_being_redefined,
    jobject loader,
    const char* name,
    jobject protection_domain,
    jint class_data_len,
    const unsigned char* class_data,
    jint* new_class_data_len,
    unsigned char** new_class_data
)
{
    *new_class_data_len = class_data_len;
    jvmti_env->Allocate(class_data_len, new_class_data);
    unsigned char* _data = *new_class_data;
    if (name && strncmp(name, package_prefix, compare_length) == 0 && strstr(name, "BySpringCGLIB") == NULL)
    {
        for (int i = 0; i < class_data_len; i++)
        {
            _data[i] = class_data[i];
        }
        decode((char*)_data);
    }
    else {
        for (int i = 0; i < class_data_len; i++)
        {
            _data[i] = class_data[i];
        }
    }
}
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *vm, char *options, void *reserved)
{
    jvmtiEnv *jvmti;
    jint ret = vm->GetEnv((void **)&jvmti, JVMTI_VERSION);
    if (JNI_OK != ret)
    {
        printf("ERROR: Unable to access JVMTI!\n");
        return ret;
    }
    jvmtiCapabilities capabilities;
    (void)memset(&capabilities, 0, sizeof(capabilities));
    capabilities.can_generate_all_class_hook_events = 1;
    capabilities.can_tag_objects = 1;
    capabilities.can_generate_object_free_events = 1;
    capabilities.can_get_source_file_name = 1;
    capabilities.can_get_line_numbers = 1;
    capabilities.can_generate_vm_object_alloc_events = 1;
    jvmtiError error = jvmti->AddCapabilities(&capabilities);
    if (JVMTI_ERROR_NONE != error)
    {
        printf("ERROR: Unable to AddCapabilities JVMTI!\n");
        return error;
    }
    jvmtiEventCallbacks callbacks;
    (void)memset(&callbacks, 0, sizeof(callbacks));
    callbacks.ClassFileLoadHook = &ClassDecryptHook;
    error = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
    if (JVMTI_ERROR_NONE != error)
    {
        printf("ERROR: Unable to SetEventCallbacks JVMTI!\n");
        return error;
    }
    error = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL);
    if (JVMTI_ERROR_NONE != error)
    {
        printf("ERROR: Unable to SetEventNotificationMode JVMTI!\n");
        return error;
    }
    return JNI_OK;
}

// JNI调用c++代码
public class ByteCodeEncryptor {
    static {
        String currentPath = ByteCodeEncryptor.class.getResource("").getPath().split("SpringBootJarEncryptor.jar!")[0];
        if (currentPath.startsWith("file:")) {
            currentPath = currentPath.substring(5);
        }
        String dllPath;
        String os = System.getProperty("os.name");
        if (os.toLowerCase().startsWith("win")) {
            dllPath = currentPath + "SpringBootJarEncryptor.dll";
        } else {
            dllPath = currentPath + "SpringBootJarEncryptor.so";
        }
        System.load(dllPath);
    }
    public native static byte[] encrypt(byte[] text);
}

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
// 加密jar代码
public class JarEncryptor {
    public static void encrypt(String fileName, String dstName) {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] buf = new byte[1024];
            File srcFile = new File(fileName);
            File dstFile = new File(dstName);
            FileOutputStream dstFos = new FileOutputStream(dstFile);
            JarOutputStream dstJar = new JarOutputStream(dstFos);
            JarFile srcJar = new JarFile(srcFile);
            for (Enumeration<JarEntry> enumeration = srcJar.entries(); enumeration.hasMoreElements(); ) {
                JarEntry entry = enumeration.nextElement();
                InputStream is = srcJar.getInputStream(entry);
                int len;
                while ((len = is.read(buf, 0, buf.length)) != -1) {
                    bos.write(buf, 0, len);
                }
                byte[] bytes = bos.toByteArray();
                String name = entry.getName();
                if (name.startsWith("com/cxp/demo") && name.endsWith(".class")) {
                    try {
                        bytes = ByteCodeEncryptor.encrypt(bytes);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                JarEntry ne = new JarEntry(name);
                dstJar.putNextEntry(ne);
                dstJar.write(bytes);
                bos.reset();
            }
            srcJar.close();
            dstJar.close();
            dstFos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        if (args == null || args.length == 0) {
            System.out.println("please input parameter");
            return;
        }
        if (args[0].endsWith(".jar")) {
            JarEncryptor.encrypt(args[0], args[0].substring(0, args[0].lastIndexOf(".")) + "_encrypted.jar");
        } else {
            File file = new File(args[0]);
            if (file.isDirectory()) {
                String[] list = file.list();
                if (list != null) {
                    for (String jarFilePath : list) {
                        if (jarFilePath.endsWith(".jar")) {
                            JarEncryptor.encrypt(args[0] + "/" + jarFilePath, args[0] + "_encrypted/" + jarFilePath);
                        }
                    }
                }
            } else {
                System.out.println("this is not a folder or folder is empty");
            }
        }
    }
}

task copyJar(type: Copy) {
    delete "$buildDir/libs/lib"
    from configurations.runtime
    into "$buildDir/libs/lib"
}
jar {
    enabled = true
    dependsOn copyJar
    archivesBaseName = "app"
    archiveVersion = ""
    manifest {
        attributes 'Main-Class': "主类全限定名",
                'Class-Path': configurations.runtime.files.collect { "lib/$it.name" }.join(' ')
    }
}

# 加密jar
RUN mkdir ./build/libs/lib_encrypted
RUN java -jar ./encrypt/SpringBootJarEncryptor.jar ./build/libs/app.jar
RUN java -jar ./encrypt/SpringBootJarEncryptor.jar ./build/libs/lib
RUN rm -r ./build/libs/lib
RUN rm ./build/libs/app.jar
RUN mv ./build/libs/lib_encrypted ./build/libs/lib
RUN mv ./build/libs/app_encrypted.jar ./build/libs/app.jar
# --- java ---
FROM java8
# 提取启动需要的资源
COPY --from=builder /build/libs/app.jar /application/app.jar
COPY --from=builder /build/libs/lib /application/lib
COPY --from=builder /encrypt /encrypt
COPY --from=builder /start.sh start.sh
ENTRYPOINT ["sh", "start.sh"]

java -agentpath:./SpringBootJarEncryptor.dll -jar app.jar