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声明

此次案例只为学习交流使用，抓包内容、敏感网址、数据接口均已做脱敏处理，切勿用于其他非法用途；

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前言

该文章使用了Charles、夜神模拟器；
主要编程语言：Python，部分涉及到：JavaScript；

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一、资源推荐

Apk下载地址：https://pan.baidu.com/s/1VGB1qkqdA028iAiywNKd4w?pwd=zhou
Charles - 夜神模拟器证书安装App抓包：https://blog.csdn.net/EXIxiaozhou/article/details/128619988
Postman API测试工具 - 基本使用：https://blog.csdn.net/EXIxiaozhou/article/details/128333884

二、任务说明

1、使用postman工具，模拟发送验证码请求；

2、使用postman工具，模拟发送注册请求；

三、App抓包分析

1、发送验证码请求：aHR0cHM6Ly93d3cueWlkaWFuYWkuY2MvYXBpL3Ntc19jb2RlL3NlbmQuaHRtbA==

2、发送验证码请求分析，请求头校验参数校验：cookie、UserAgent；
phone是手机号参数，api_token是加密参数，下面是加密明文，JS加密代码我会放在文章后面；

var date= new Date().format("yyyy-MM-dd");
var api_token = md5.hex_md5('api/SmsCode/send'+date+'yiling6670238160ravntyoneapp7926')

3、发送注册请求：aHR0cHM6Ly93d3cueWlkaWFuYWkuY2MvbW9iaWxlL3JlZ2lzdGVyL2luZGV4Lmh0bWw=

4、发送注册请求分析，请求头校验参数校验：cookie、UserAgent；

四、还原JS加密

1、Date类

Date.prototype.format = function(fmt) {var o = {"M+" : this.getMonth()+1,                 //月份"d+" : this.getDate(),                    //日"h+" : this.getHours(),                   //小时"m+" : this.getMinutes(),                 //分"s+" : this.getSeconds(),                 //秒"q+" : Math.floor((this.getMonth()+3)/3), //季度"S"  : this.getMilliseconds()             //毫秒};if(/(y+)/.test(fmt)) {fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));}for(var k in o) {if(new RegExp("("+ k +")").test(fmt)){fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));}}return fmt;
}

2、MD5类

var md5 = function() {var hexcase = 0;var b64pad = "";var chrsz = 8;function md5_vm_test() {return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";}function core_md5(x, len) {x[len >> 5] |= 0x80 << ((len) % 32);x[(((len + 64) >>> 9) << 4) + 14] = len;var a = 1732584193;var b = -271733879;var c = -1732584194;var d = 271733878;for (var i = 0; i < x.length; i += 16) {var olda = a;var oldb = b;var oldc = c;var oldd = d;a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);a = safe_add(a, olda);b = safe_add(b, oldb);c = safe_add(c, oldc);d = safe_add(d, oldd);}return Array(a, b, c, d);}function md5_cmn(q, a, b, x, s, t) {return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);}function md5_ff(a, b, c, d, x, s, t) {return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);}function md5_gg(a, b, c, d, x, s, t) {return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);}function md5_hh(a, b, c, d, x, s, t) {return md5_cmn(b ^ c ^ d, a, b, x, s, t);}function md5_ii(a, b, c, d, x, s, t) {return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);}function core_hmac_md5(key, data) {var bkey = str2binl(key);if (bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);var ipad = Array(16),opad = Array(16);for (var i = 0; i < 16; i++) {ipad[i] = bkey[i] ^ 0x36363636;opad[i] = bkey[i] ^ 0x5C5C5C5C;}var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);return core_md5(opad.concat(hash), 512 + 128);}function safe_add(x, y) {var lsw = (x & 0xFFFF) + (y & 0xFFFF);var msw = (x >> 16) + (y >> 16) + (lsw >> 16);return (msw << 16) | (lsw & 0xFFFF);}function bit_rol(num, cnt) {return (num << cnt) | (num >>> (32 - cnt));}function str2binl(str) {var bin = Array();var mask = (1 << chrsz) - 1;for (var i = 0; i < str.length * chrsz; i += chrsz) bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);return bin;}function binl2str(bin) {var str = "";var mask = (1 << chrsz) - 1;for (var i = 0; i < bin.length * 32; i += chrsz) str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);return str;}function binl2hex(binarray) {var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";var str = "";for (var i = 0; i < binarray.length * 4; i++) {str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);}return str;}function binl2b64(binarray) {var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var str = "";for (var i = 0; i < binarray.length * 4; i += 3) {var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16) | (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8) | ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);for (var j = 0; j < 4; j++) {if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);}}return str;}return {hex_md5: function(s) {return binl2hex(core_md5(str2binl(s), s.length * chrsz));},b64_md5: function(s) {return binl2b64(core_md5(str2binl(s), s.length * chrsz));},str_md5: function(s) {return binl2str(core_md5(str2binl(s), s.length * chrsz));},hex_hmac_md5: function(key, data) {return binl2hex(core_hmac_md5(key, data));},b64_hmac_md5: function(key, data) {return binl2b64(core_hmac_md5(key, data));},str_hmac_md5: function(key, data) {return binl2str(core_hmac_md5(key, data));}}
}();

3、组合调用还原 api_token 参数

function get_apiToken(){var date= new Date().format("yyyy-MM-dd");var api_token = md5.hex_md5('api/SmsCode/send'+date+'yiling6670238160ravntyoneapp7926')return api_token
}
console.log(get_apiToken())

4、execjs模块调用JS代码

import execjs
with open(file='encode.js', mode='r', encoding='utf-8') as fis:js_code = fis.read()  # 读取JS代码文件
js_obj = execjs.compile(js_code)  # 激将JS代码传入
js_obj.call('function', 'params')  # 调用JS的函数, 参数1：函数名、参数2：该函数所需要的参数

五、问题遗留

1、如何获取Cookie

手动抓包复制后台返回的cookie添加至headers中，一般微信不切换设备登录cookie是不会发生变化的；
set-cookie的请求：aHR0cHM6Ly93d3cueWlkaWFuYWkuY2MvbW9iaWxlL1NoYXJlL2luZGV4P2ludml0ZXI9eHh4eA==

关于set-cookie的请求，可能进行了OAuth授权，仅是更换 user-agent不起作用，使用工具模拟发包一直返回请在微信客户端打开链接；

2、问题：请在微信客户端打开链接

微信UserAgent：Mozilla/5.0 (iPhone; CPU iPhone OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Mobile/9B176 MicroMessenger/4.3.2
微信UserAgent：Mozilla/5.0 (Linux; U; Android 2.3.6; zh-cn; GT-S5660 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 MicroMessenger/4.5.255
解决方案1：尝试将user-agent里面的MicroMessenger修改成 micromessage；

3、留言

如果有人可以通过校验，自动拿到cookie，请指教本人(有偿)，谢谢！

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注意

本文章中所有内容仅供学习交流，抓包内容、敏感网址、数据接口均已做脱敏处理，严禁用于商业用途和非法用途，否则由此产生的一切后果均与作者无关，若有侵权，请联系我立即删除！

本文章未经许可禁止转载，禁止任何修改后二次传播，擅自使用本文讲解的技术而导致的任何意外，作者均不负责，若有侵权，请在公众号【程序员 小洲】联系作者立即删除！