有关于StarUML v7.0+的逆向方案，仅供用于学习交流
1 查找突破点
1.1 搜索关键词
进去先随便看看搜索相关关键词，不出意外找到了license-client.js，疑似授权验证逻辑的所在
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1.2 常量分析
看到了一些关键常量，分析一下
const LICENSE_PRODUCT_ID = packageJson.productId;
// 字符串，值为'STARUML.V7'，对应了软件版本
const LICENSE_CRYPTO_KEY = "y0JMc9mvB1uvIi82GhdMJQXzVJxl+1Lc0RqZqWaQvx0=";
// AES对称加密算法，很可能是activation.key激活文件的生成密钥
const LICENSE_SERVER_URL = "https://dev.staruml-io-astro.pages.dev/api/license-manager";
// 官方服务器的激活url
const LICENSE_FILE_NAME = "activation.key";
// 激活文件的名称
const LICENSE_TRIAL_MODE_ENABLED = true;
// 启用试用方案
const LICENSE_TRIAL_TIMESTAMP_FILE_NAME = "lib.so";
// 试用的时间戳信息，内容为用户首次打开软件的时间，这个时间加上下面的试用时长得出试用失效日期
const LICENSE_TRIAL_MODE_DAYS = 30; // negative for infinite, positive for days left
// 这一段官方说的，负数即可破解，无限试用，但我试了没用
2 修改方案
看到这里有两个方案，一个是直接修改lib.so的时间戳实现无限试用，二是尝试分析激活逻辑
2.1 无限试用
文本形式修改lib.so文件内容为4102329600000，也就是2099年，就可以无限试用了，但是每次都有弹窗，有点麻烦
2.2 Keygen
2.2.1 AI分析
直接把license-client.js丢给ai分析一波，得到了流程图突然就豁然开朗了
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2.2.2 分析localValidate方法
async function localValidate() {
try {
const filePath = path.join(app.getPath("userData"), LICENSE_FILE_NAME);
// %appdata%/StarUML/activation.key，这是授权文件的绝对路径
const activationCode = await fs.readFile(filePath, "utf8");
const decoded = await decodeActivationCode(activationCode); // 这个函数就是解码activation.key的逻辑了，其实就是AES对称加密，key就是之前看到的常量，直接喂给AI生成Keygen
const deviceId = await getDeviceId();
const isProductMatched = decoded.product === LICENSE_PRODUCT_ID;
const isDeviceIdMatched =
decoded.deviceId === "*" || decoded.deviceId === deviceId; // 设备id区别'*'为通配，和个人设备id，两者均通过(但后面发现'*'只能离线激活)
if (!isProductMatched) { // 判断产品软件版本是否匹配
await checkTrialMode();
await localDeactivate();
return {
success: false,
message: "Invalid activation code (product mismatch)",
};
}
if (!isDeviceIdMatched) { // 判断产品授权的设备id是否匹配
await checkTrialMode();
await localDeactivate();
return {
success: false,
message: "Invalid activation code (device ID mismatch)",
};
}
// 上面两条判断均通过则成功授权，赋值产品信息
licenseStatus = {
activated: true,
name: decoded.name,
product: decoded.product,
edition: decoded.edition,
productDisplayName: getProductDisplayName(
decoded.product,
decoded.edition,
),
deviceId: decoded.deviceId,
licenseKey: decoded.licenseKey,
activationCode: activationCode,
trial: false,
trialDaysLeft: 0,
};
return {
success: true,
message: "Local validation successful (activated)",
};
} catch (err) {
// if the file does not exist, assume the license is not activated
}
await localDeactivate();
return {
success: true,
message: "Local validation successful (not activated)",
};
}
2.2.3 生成Keygen
已知算法和解码方法，直接把license-client.js丢给AI，生成Keygen，下面是AI给的代码
// aes-gcm-node.js
// Node.js AES-GCM (Base64 key) encrypt/decrypt compatible with WebCrypto output format:
// "ivBase64:encryptedBase64" where encryptedBase64 = base64(ciphertext || authTag)
const crypto = require("crypto");
/**
* Base64 -> Buffer * @Param {string} b64
* @returns {Buffer}
*/
function base64ToBuffer(b64) {
return Buffer.from(b64, "base64");
}
/**
* Buffer -> Base64 * @param {Buffer} buf
* @returns {string}
*/
function bufferToBase64(buf) {
return buf.toString("base64");
}
/**
* Encrypt a UTF-8 string with AES-GCM using a base64-encoded raw key. * @param {string} plaintext
* @param {string} base64Key // raw AES key in base64 (e.g. 32 bytes -> AES-256-GCM)
* @returns {string} "ivBase64:encryptedBase64"
*/function encryptString(plaintext, base64Key) {
const key = base64ToBuffer(base64Key);
// 12 bytes IV is recommended for AES-GCM
const iv = crypto.randomBytes(12);
const cipher = crypto.createCipheriv(`aes-${key.length * 8}-gcm`, key, iv);
const ptBuf = Buffer.from(plaintext, "utf8");
const ct = Buffer.concat([cipher.update(ptBuf), cipher.final()]);
const authTag = cipher.getAuthTag();
// Put ciphertext and tag together (WebCrypto expects ciphertext||tag)
const encryptedBuffer = Buffer.concat([ct, authTag]);
return `${bufferToBase64(iv)}:${bufferToBase64(encryptedBuffer)}`;
}
/**
* Decrypt a string in the "ivBase64:encryptedBase64" format using base64-encoded raw key. * @param {string} encryptedText
* @param {string} base64Key
* @returns {string} plaintext
*/function decryptString(encryptedText, base64Key) {
const key = base64ToBuffer(base64Key);
const [ivB64, encryptedB64] = encryptedText.split(":");
if (!ivB64 || !encryptedB64) {
throw new Error("Invalid encryptedText format. Expect iv:encrypted");
} const iv = base64ToBuffer(ivB64);
const encryptedBuffer = base64ToBuffer(encryptedB64);
// authTag is last 16 bytes for AES-GCM
const authTag = encryptedBuffer.slice(encryptedBuffer.length - 16);
const ciphertext = encryptedBuffer.slice(0, encryptedBuffer.length - 16);
const decipher = crypto.createDecipheriv(`aes-${key.length * 8}-gcm`, key, iv);
decipher.setAuthTag(authTag);
const pt = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
return pt.toString("utf8");
}
module.exports = {
encryptString,
decryptString,
};
自己再写一个命令行交互接口，调用AI给的代码方法encryptString()
plaintext为JSON.stringify(licenseStatus)
key是y0JMc9mvB1uvIi82GhdMJQXzVJxl+1Lc0RqZqWaQvx0=
示例:
> [email protected] start
> node main.js
2. {STARUML.V2: StarUML V2}
3. {STARUML.V3: StarUML V3}
4. {STARUML.V4: StarUML V4}
5. {STARUML.V5: StarUML V5}
6. {STARUML.V6: StarUML V6}
7. {STARUML.V7: StarUML V7}
choose product version:
7
--------------------------------
0. {STD: Standard}
1. {PRO: Professional}
2. {CO: Commercial}
3. {ED: Educational}
4. {PS: Personal}
5. {CR: Classroom}
6. {CAMPUS: Campus}
7. {SITE: Site}
choose product edition:
1
--------------------------------
input your user name:
dean
--------------------------------
input your deviceId (default '*', not recommend):
--------------------------------
YQisnVjmlSZFrp/5:6mSudJku7gJhSc7zijcOolZGG83zJ9e8yaIx2RJCc0qVDqrZM6gfM+jlyf/gnaG41iSLuq7EeFc4RcjYP0r+X97xgBRSMd8cA/1QrtQaEJ/BbNbUTRD0xkFUZgueeabpgX7xEqN5jzyVtk1x12Ocf94ymuyxtzTa
2.3 潜在问题修改
发现联网状态下会在执行localvalidate后会调用remoteValidate方法进行联网验证，导致激活失败。有两种解决思路，一是防火墙出站规则拦截掉，二是修改远程验证函数。前者防火墙拦截会导致每次启动都有网络验证耗时，导致启动缓慢，后者则需要拆包修改
2.3.1 拆包修改
防火墙拦截百度一下即可，这里聊一下拆包。确保执行npm i asar -g安装完成
打包: asar pack app app.asar
解包: asar extract app.asar app
找到src\utils\license-client.js中的remoteValidate()
直接把网络请求注释掉，添加返回成功结果即可，修改后打包回去覆盖
/**
* Validate the activation code with the server.
*/
async function remoteValidate() {
const { activated, activationCode, deviceId } = licenseStatus;
if (!activated) {
return {
success: true,
message: "Validation successful (not activated)",
};
}
try {
if (deviceId === "*") {
// if offline activation, deactivate if the server is reachable
const response = await fetch(`${LICENSE_SERVER_URL}/ping`, {
method: "POST",
});
if (response.ok) {
await localDeactivate();
return {
success: false,
message: "License deactivated (illegal offline use)",
};
}
} else {
// if online activation, validate the activation code with the server
/* modify
const response = await fetch(`${LICENSE_SERVER_URL}/validate`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({
activation_code: activationCode,
}),
});
if (response.ok) {
const data = await response.json();
if (data.success) {
const decoded = await decodeValidationCode(data.validation_code);
if (decoded.deviceId === deviceId) {
return {
success: true,
message: "Validation successful (activated)",
};
}
}
}
*/
return {
success: true,
message: "Validation successful (activated)",
};
await localDeactivate();
return {
success: false,
message: "License deactivated by server",
};
}
} catch (err) {
// if server is not accessible, assume the validation is success.
return {
success: true,
message: "Validation successful (offline)",
};
}
}
3 结尾
测试成功
附件:
StarUML_Keygen.rar
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