使用JVMTI實現(xiàn)SpringBoot的jar加密,防止反編譯
1.背景
ToB項目私有化部署,攜帶有項目jar包,防止別人下載jar,反編譯出源碼
2.JVMTI解釋
JVMTI(Java Virtual Machine Tool Interface)即指 Java 虛擬機工具接口,它是一套由虛擬機直接提供的 native 接口,它處于整個 JPDA(Java Platform Debugger Architecture) 體系的最底層,所有調試功能本質上都需要通過 JVMTI 來提供。
通過這些接口,開發(fā)人員不僅調試在該虛擬機上運行的 Java 程序,還能查看它們運行的狀態(tài),設置回調函數(shù),控制某些環(huán)境變量,從而優(yōu)化程序性能。
3.使用JVMTI思路
在SpringBoot項目打包后,通過dll動態(tài)鏈接庫(so共享對象)加密生成新的jar,在啟動jar時,讓jvm啟動時調用jvmti提供的Agent_OnLoad方法,用c++去實現(xiàn),去解密對應的class文件。
利用c++編譯型語言特性,無法反編譯出對應的加密解密方法。
4.實現(xiàn)源碼
c++加密實現(xiàn)和jvm啟動監(jiān)聽,需要jni.h,jvmti.h,jni_md.h三個頭文件,分別在java環(huán)境變量下include和include/linux(win32)下
// c++加密頭文件
#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++加密解密源碼
#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;
}java加密邏輯:
// JNI調用c++代碼
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代碼
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");
}
}
}
}實現(xiàn)步驟:
1.先把c++打成dll(so)動態(tài)鏈接庫
2.通過java調用dll文件,加密jar
3.啟動加密后的jar,加上啟動參數(shù)-agentpath:*.dll
gradle.build打包:
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': "主類全限定名",
'Class-Path': configurations.runtime.files.collect { "lib/$it.name" }.join(' ')
}
}Dockerfile文件:
# 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 # 提取啟動需要的資源 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"]
啟動命令:
java -agentpath:./SpringBootJarEncryptor.dll -jar app.jar
5.踩坑
java使用jni調用c++函數(shù),c++被調用的函數(shù)名要與java方法全限定名一致,如:com.cxp.demo.encrypt.ByteCodeEncryptor#encrypt=》Java_com_cxp_demo_encrypt_ByteCodeEncryptor_encrypt,注意java和c++數(shù)據(jù)類型的對應關系
JVMTI只能作用Java原生啟動類加載器,而SpringBoot有自己啟動類加載器,讀取SpringBoot規(guī)定的原文件路徑(BOOT-INF/classes)和依賴路徑(BOOT-INF/lib),所以SpringBoot要打包成普通jar方式,bootjar是SpringBoot默認的打包方式,改為jar打包方式無法打入依賴包,只能把依賴包打到同文件夾下,修改MANIFEST.MF文件的CLass-Path屬性,把依賴包添加進去。可以看下SpringBoot的啟動jar和普通jar區(qū)別。
c++在linux下打成so庫,可以自行搜索下,推薦使用cmake
java引入dll動態(tài)庫,只能放在java的classpath下或絕對路徑
引包方式改為可以打出依賴包的方式,如compile,運行時不需要的可以不用
總結
以上為個人經驗,希望能給大家一個參考,也希望大家多多支持腳本之家。
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