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537 lines
20 KiB
537 lines
20 KiB
title: 某校园网认证api分析
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author: lensfrex
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cover: 'https://oss-img.ciduid.top/blog/covers/61391031_p0_compressed.png'
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tags:
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- 网络
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categories:
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- 网络
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date: 2022-07-06 13:22:00
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---
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> 封面：https://www.pixiv.net/artworks/61391031
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---
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*最近突然来了兴趣，想搞一搞校园网认证页的认证api，方便以后自动登录，而不是每次联网都要手动登陆一遍*
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*虽然我这里可以直接用拨号登录，而且我已经用上了路由器，直接全程连接，更加方便，但是还是想搞一搞这个登录认证*
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*这里只是在研究认证页的时候的随手记，如果直接看的话可能会一脸懵逼，等有空了我再补充详细的过程吧（咕）*
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---
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> ### 后续来啦：[这里](https://www.ciduid.top/2022/1113/srun-login-analyze/)
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---
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学校校园网登录认证的过程大致分为两步
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## 1. 获取challenge码
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这部分简单，直接发学号用户名（学号）就行了
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Base URL：`http://59.68.177.183/cgi-bin/get_challenge`
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方法：GET
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请求参数：
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``` apache
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callback: jQuery112409362602503309623_1657072809873
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username: 【学号】
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ip: 10.15.2.109
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_: 1657072809875
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```
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callback: 回调函数，后半部分为时间戳，不设置callback的话只有ok
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username: 顾名思义
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ip: 顾名思义
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_: 时间戳
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注意：这里的时间戳是GMT时间，而不是咱们的东八区时间
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服务器返回数据，有用的是`challenge`
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``` apache
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challenge: "4d8e7d882e52c17537e1203191a8308fe294520bfb8e15c1f860bd1b03d983cc"
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client_ip: "10.15.2.109"
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ecode: 0
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error: "ok"
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error_msg: ""
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expire: "60"
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online_ip: "10.15.2.109"
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res: "ok"
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srun_ver: "SRunCGIAuthIntfSvr V1.18 B20211105"
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st: 1657074027
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```
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---
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## 2. 根据challenge码进行验证
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这部分就有点复杂了，但还好，浏览器控制台跳几跳就看得出来是怎样的了
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Base URL：`http://59.68.177.183/cgi-bin/srun_portal`
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方法：GET
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请求参数
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``` apache
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callback: jQuery112409362602503309623_1657072809873
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action: login
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username: 【学号】
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password: {MD5}a25f5a06d8484669fb3ca3df0362efc8
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os: Windows 10
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name: Windows
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double_stack: 0
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chksum: be73bd397721c3f39392e3fbfcc8124be9d0516a
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info: {SRBX1}F1DdbTEkXB8FyHKlvt+GnvkjogeyV6HZst2G+VWWo684jx/32muHiDv3fKLh9AwIoaUCsu2rRaLlOB2Te5A4lYSFqCPLGJizZ5KsBUX5t6tNcN6coDACovbe4Pv0fF0pulYtqpy+i6D=
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ac_id: 7
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ip: 10.15.2.109
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n: 200
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type: 1
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_: 1657072809876
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```
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`password`字段的MD5由明文密码和上面得到的`challenge`码拼接之后得到的MD5
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``` apache
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ServerFlag: 0
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ServicesIntfServerIP: "172.26.23.173"
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ServicesIntfServerPort: "8001"
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access_token: "4d8e7d882e52c17537e1203191a8308fe294520bfb8e15c1f860bd1b03d983cc"
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checkout_date: 0
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client_ip: "10.15.2.109"
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ecode: 0
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error: "ok"
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error_msg: ""
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online_ip: "10.15.2.109"
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ploy_msg: "E0000: Login is successful."
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real_name: ""
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remain_flux: 0
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remain_times: 0
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res: "ok"
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srun_ver: "SRunCGIAuthIntfSvr V1.18 B20211105"
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suc_msg: "login_ok"
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sysver: "1.01.20211105"
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username: "【学号】"
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wallet_balance: 0
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```
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在这里把登录认证发送部分的js代码挂上来（没有完全混淆代码而且还有注释，太棒啦）：
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这里的`token`即是之前获取到的`challenge`
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请求部分的代码在此：
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<details>
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<summary>查看完整代码</summary>
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```javascript
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_loginAccount.set(_assertThisInitialized(_this), {
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writable: true,
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value: function value(obj) {
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// 加密常量
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var type = 1;
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var n = 200;
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var enc = 'srun_bx1';
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// 用户信息
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var username = _this.userInfo.username + _this.userInfo.domain;
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var password = _this.userInfo.password;
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var ac_id = _this.portalInfo.acid;
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// 正在等待中的请求
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var pendingReqNum = 0;
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// 请求成功的消息
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var successMsg = '';
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// 发起认证方法
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var sendAuth = function sendAuth() {
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var host = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';
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// 双栈认证时 IP 参数为空
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var ip = _this.portalInfo.doub && host ? '' : _this.userInfo.ip;
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// 获取 Token
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_classPrivateFieldGet(_assertThisInitialized(_this), _getToken)
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.call(_assertThisInitialized(_this), host, ip, function(token) {
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// 用户密码 MD5 加密
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var hmd5 = md5(password, token);
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// 用户信息加密
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var i = _classPrivateFieldGet(_assertThisInitialized(_this), _encodeUserInfo).call(_assertThisInitialized(_this), {
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username: username,
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password: password,
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ip: ip,
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acid: ac_id,
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enc_ver: enc
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}, token);
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var str = token + username;
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str += token + hmd5;
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str += token + ac_id;
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str += token + ip;
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str += token + n;
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str += token + type;
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str += token + i;
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// 防止 IPv6 请求网络不通进行 try catch
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try {
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pendingReqNum += 1;
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// 发起认证请求
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_this.ajax.jsonp({
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host: host,
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url: _classPrivateFieldGet(_assertThisInitialized(_this), _api)
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.auth,
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params: {
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action: 'login',
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username: username,
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password: _this.userInfo.otp ? '{OTP}' + password : '{MD5}' + hmd5,
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os: _this.portalInfo.userDevice.device,
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name: _this.portalInfo.userDevice.platform,
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// 未开启双栈认证，参数为 0
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// 开启双栈认证，向 Portal 当前页面 IP 认证时，参数为 1
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// 开启双栈认证，向 Portal 另外一种 IP 认证时，参数为 0
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double_stack: _this.portalInfo.doub && !host ? 1 : 0,
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chksum: sha1(str),
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info: i,
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ac_id: ac_id,
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ip: ip,
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n: n,
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type: type
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},
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success: function success(res) {
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pendingReqNum -= 1;
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// 认证成功，用户上线
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_this.online = true;
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// 更改登录状态为结束
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_this.running.login = false;
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// IP 已经在线了 - 给出提示
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if (res.suc_msg === 'ip_already_online_error' && obj.error)
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return _this.confirm({
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message: _this.translate('ip_already_online_error'),
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confirm: function confirm() {
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if (obj.error)
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obj.error();
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}
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});
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// 翻译后的认证成功信息
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successMsg = _this.translate(res);
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},
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error: function error(res) {
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pendingReqNum -= 1;
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// 更改登录状态为结束
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_this.running.login = false;
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// 若 ecode 为 E2620 且开启了在线设备管理功能
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// E2620: 超出允许的在线数目
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if (res.ecode === 'E2620' && CREATER.useOnlineDeviceMgr)
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return _this.confirm({
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message: _this.translate('E2620Tips'),
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confirm: function confirm() {
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_this.dialog.open('onlineDeviceMgr', function() {
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_this.getOnlineDevice();
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});
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}
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});
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// IP 已经在线了 - 重新认证
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if (res.error_msg === 'ip_already_online_error')
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return _this.reAuth(obj);
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// 需要查询日志的情况
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if (res.error_msg === 'not_online_error')
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return _this.showLog();
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if (res.error_msg === 'no_response_data_error')
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return _this.showLog();
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if (res.error_msg === 'RD000')
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return _this.showLog();
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// 若提示修改密码
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if (res.error_msg === 'user_must_modify_password')
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return _this.confirm({
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message: _this.translate(res),
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confirmText: _this.translate('ToChangePassword'),
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confirm: function confirm() {
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return $('#forget')
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.click();
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},
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cancel: function cancel() {}
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});
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// 错误提示
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_this.confirm({
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message: _this.translate(res),
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confirm: function confirm() {
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if (obj.error)
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obj.error(res);
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}
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});
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}
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});
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} catch (err) {
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// 因为 IPv6 网络问题导致的认证失败
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pendingReqNum -= 1;
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}
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});
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};
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```
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</details>
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上面的`portalInfo`是从`config`来的，而`config`定义在登录认证首页下面：
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``` javascript
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var CONFIG = {
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page : 'account',
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ip : "10.15.2.109",
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nas : "",
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mac : "",
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url : "",
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lang : "zh-CN" || 'zh-CN',
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isIPV6 : false ,
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portal : {"AuthIP":"","AuthIP6":"","ServiceIP":"https://59.68.177.181:8800","DoubleStackPC":false,"DoubleStackMobile":false,"AuthMode":false,"CloseLogout":false,"MacAuth":false,"RedirectUrl":true,"OtherPCStack":"IPV4","OtherMobileStack":"IPV4","MsgApi":"new","PublicSuccessPages":true,"TrafficCarry":1000,"UserAgreeSwitch":false,"DialSwitch":false},
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notice : "list",
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priceList : {"Prices":"5,10,20,50,100","Default":"0.01","BalanceWarning":"5"}
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};
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```
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info字段的数据是在下面这里生成的，关键是encode函数，具体是什么算法看不出来
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encode函数生成一段神奇的编码数据之后再用一种动过手脚的base64编码一下就得到了上面的i变量
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把这段代码算法转成其他其他语言就好办很多了
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<details>
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<summary>展开查看代码（js）</summary>
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``` javascript
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_encodeUserInfo.set(_assertThisInitialized(_this), {
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writable: true,
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value: function value(info, token) {
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// 克隆自 $.base64，防止污染
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var base64 = _this.clone($.base64);
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// base64 设置 Alpha
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base64.setAlpha('LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA');
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// 用户信息转 JSON
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info = JSON.stringify(info);
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function encode(str, key) {
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if (str === '')
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return '';
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var v = s(str, true);
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var k = s(key, false);
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if (k.length < 4)
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k.length = 4;
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var n = v.length - 1, z = v[n], y = v[0], c = 0x86014019 | 0x183639A0, m, e, p, q = Math.floor(6 + 52 / (n + 1)), d = 0;
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while (0 < q--) {
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d = d + c & (0x8CE0D9BF | 0x731F2640);
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e = d >>> 2 & 3;
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for (p = 0; p < n; p++) {
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y = v[p + 1];
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m = z >>> 5 ^ y << 2;
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m += y >>> 3 ^ z << 4 ^ (d ^ y);
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m += k[p & 3 ^ e] ^ z;
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z = v[p] = v[p] + m & (0xEFB8D130 | 0x10472ECF);
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}
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y = v[0];
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m = z >>> 5 ^ y << 2;
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m += y >>> 3 ^ z << 4 ^ (d ^ y);
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m += k[p & 3 ^ e] ^ z;
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z = v[n] = v[n] + m & (0xBB390742 | 0x44C6F8BD);
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}
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return l(v, false);
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}
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function s(a, b) {
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var c = a.length;
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var v = [];
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for (var i = 0; i < c; i += 4) {
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v[i >> 2] = a.charCodeAt(i) | a.charCodeAt(i + 1) << 8 | a.charCodeAt(i + 2) << 16 | a.charCodeAt(i + 3) << 24;
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}
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if (b)
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v[v.length] = c;
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return v;
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}
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function l(a, b) {
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var d = a.length;
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var c = d - 1 << 2;
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if (b) {
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var m = a[d - 1];
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if (m < c - 3 || m > c)
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return null;
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c = m;
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}
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for (var i = 0; i < d; i++) {
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a[i] = String.fromCharCode(a[i] & 0xff, a[i] >>> 8 & 0xff, a[i] >>> 16 & 0xff, a[i] >>> 24 & 0xff);
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}
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return b ? a.join('').substring(0, c) : a.join('');
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}
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return '{SRBX1}' + base64.encode(encode(info, token));
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}
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});
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```
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</details>
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用go简单实现了一下这段加密算法：
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<details>
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<summary>展开查看代码（go）</summary>
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```go
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import (
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"encoding/base64"
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"math"
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)
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// 这里的base64和正常的base64编码是不一样的，这里的base64并不按照普通的ABCD字母顺序来对应相应字节，而是按照以下字母表对应字节
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const magicBase64Alpha = "LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA"
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var magicBase64 = base64.NewEncoding(magicBase64Alpha)
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func Encode(str string, key string) string {
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encodeResult := encode(str, key)
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base64Result := magicBase64.EncodeToString(int32ToAsciiBytes(encodeResult))
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return "{SRBX1}" + base64Result
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}
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// encode 直接照着原网页的js代码改的，只是能跑
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// 因为各种类型转换从理论上来说性能可能会差了点，但是在这里的使用情景几乎是感觉不到的
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// 难度其实主要还是在于动态类型语言和静态类型语言在运算时数据溢出的问题不好处理
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func encode(str string, key string) []int32 {
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v := magicEncode(str, true)
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k := magicEncode(key, false)
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if len(k) < 4 {
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for i := 0; i < (4 - len(k)); i++ {
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k = append(k, 0)
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}
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}
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n := int32(len(v) - 1)
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z := v[n]
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y := v[0]
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c := int32(-1640531527)
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q := int(math.Floor(float64(6+52/(n+1)))) - 1
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d := int32(0)
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var e, p int32
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// 这里的m用int64（long）是因为后面+=的时候int32会溢出
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// 其他变量不用int64是因为直接用int64会导致位运算错误，和js的运算结果不一致
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var m int64
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for ; q >= 0; q-- {
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d = d + c&(-1)
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e = uRightShift(d, 2) & 3
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for p = 0; p < n; p++ {
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y = v[p+1]
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m = int64(uRightShift(z, 5) ^ y<<2)
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m += int64(uRightShift(y, 3) ^ z<<4 ^ (d ^ y))
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m += int64(k[p&3^e] ^ z)
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v[p] = v[p] + int32(m&(-1))
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z = v[p]
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}
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y = v[0]
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m = int64(uRightShift(z, 5) ^ y<<2)
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m += int64(uRightShift(y, 3) ^ z<<4 ^ (d ^ y))
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m += int64(k[p&3^e] ^ z)
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v[n] = v[n] + int32(m&(-1))
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z = v[n]
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}
|
|
|
|
return magicDecode(v, false)
|
|
}
|
|
|
|
// 神秘的“初步”加密代码，把字符串一四个字符为一组转成神秘的int32数组
|
|
func magicEncode(source string, sizeOnLast bool) (result []int32) {
|
|
data := []int32(source)
|
|
dataLen := len(data)
|
|
|
|
resultLen := dataLen / 4
|
|
if sizeOnLast {
|
|
result = make([]int32, resultLen+1)
|
|
result[resultLen] = int32(dataLen)
|
|
} else {
|
|
result = make([]int32, resultLen)
|
|
}
|
|
|
|
for i := 0; i < dataLen; i += 4 {
|
|
result[i>>2] = get(data, i, dataLen) | get(data, i+1, dataLen)<<8 | get(data, i+2, dataLen)<<16 | get(data, i+3, dataLen)<<24
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
//和上面的是反过来的
|
|
func magicDecode(data []int32, sizeOnLast bool) (result []int32) {
|
|
dataLength := len(data)
|
|
|
|
c := dataLength - 1<<2
|
|
|
|
if sizeOnLast {
|
|
m := int(data[dataLength-1])
|
|
if m < c-3 || m > c {
|
|
return nil
|
|
}
|
|
c = m
|
|
}
|
|
|
|
for i := 0; i < dataLength; i++ {
|
|
result = append(result, data[i]&0xff, uRightShift(data[i], 8)&0xff, uRightShift(data[i], 16)&0xff, uRightShift(data[i], 24)&0xff)
|
|
}
|
|
|
|
if sizeOnLast {
|
|
return append(result, int32(c))
|
|
} else {
|
|
return result
|
|
}
|
|
}
|
|
|
|
// 在go中实现无符号右移（>>>）
|
|
func uRightShift(number int32, shift int) int32 {
|
|
return int32(uint32(number) >> shift)
|
|
}
|
|
|
|
func get(data []int32, index int, length int) int32 {
|
|
if index >= length {
|
|
return 0
|
|
} else {
|
|
return data[index]
|
|
}
|
|
}
|
|
|
|
func int32ToAsciiBytes(data []int32) []byte {
|
|
result := make([]byte, len(data))
|
|
for i, number := range data {
|
|
result[i] = byte(number)
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
```
|
|
</details>
|
|
|
|
更详细的加密算法分析过程请看[这里](https://www.ciduid.top/2022/1113/srun-login-analyze/)
|
|
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