爬虫反爬：JS逆向之实战3

1. 简介

从上面两节实战中已经可以做一个属于自己的翻译应用了，甚至可以对翻译结果进行对比然后通过一些语意软件进行优化，这里的所有的DEMO都只是为了学习JS逆向这些技能的过程，今天这节是关于某东登陆参数的逆向，只是为了巩固调试技巧，在实际操作上也不能直接登陆，因为还有一个滑块验证，这个后期再学习。

2. 实战信息

网址：
aHR0cHM6Ly9wYXNzcG9ydC5qZC5jb20vbmV3L2xvZ2luLmFzcHg=
接口：
aHR0cHM6Ly9wYXNzcG9ydC5qZC5jb20vdWMvbG9naW5TZXJ2aWNlP3V1aWQ9NTMzZGJiN2MtNzQ3Yi00MzhmLTgwOGUtZWNiOTRkNzhjM2FiJiZyPTAuNTg0MzU4NzYxMDE0ODc0NCZ2ZXJzaW9uPTIwMTU=
逆向参数：

• uuid
• eid
• fp
• nloginpwd
• authcode
• pubKey
• sa_token
• seqSid

3. 实战流程

3.1 找接口

点击登陆通过按F12打开控制台的network找到发请求的包。这里由于有个参数是通过页面加载时发送的一个请求获取的，建议在打开控制台后刷新页面重新抓包加载。

3.2 下断点

首先肯定先测试XHR断点，因为XHR可以快速断到函数的调用栈，从栈中往上找即可。
通过"/uc/loginService"可以直接断住。

看函数名称就可以知道是"loginSubmit"，所以我们可以直接打过去查看传参位置。

可以看到uuid、eid、fp、pubKey、sa_token是直接.val()获取的，从这里可以看出调用的是jQuey的input文本框里面的属性值，但是我们没有从界面上看到，所以他肯定是，所以可以直接去html中找到，直接搜索即可。nloginpwd参数使用了加密方法getEntryptPwd()，seqSid参数是通过window中的属性拿到的。

我们首先在页面中找到这些参数，直接搜索"f8…"这些具体数据即可。

所以在login.aspx中可以直接在input的value的属性中找到。

然后去找nloginpwd参数的调用方法，然后抠下来去本地运行即可。

function getEntryptPwd(pwd){var pubKey = $('#pubKey').val();if(!pwd || !pubKey || !SysConfig.encryptInfo){return pwd;}var encrypt = new JSEncrypt();encrypt.setPublicKey(pubKey);return encrypt.encrypt(pwd);}

这里可以看到$(‘#pubKey’).val()就是获取html公钥所以抠下来的代码需要替换掉，可以抠下测试代码来，这里需要一些本地Navigator还有Window这些对象环境，所以直接放到Snippets上运行。

debug运行结果：

Snippets面板结果：

最后寻找seqSid这个参数是从window._jdtdmap_sessionId中来，我们首先搜索一下里面的值"351931498402249129"。

从这里也可以看到_jdtdmap_sessionId的值是写死的，但是在这段代码里没看到加入到window中，所以我们直接搜索_jdtdmap_sessionId，去寻找哪里加入到window中或者是否被处理。

在排除完后发现只有这段混淆的代码疑似可能是放到window对象中的代码。

看到代码的最前部分是由eval()方法独立运行的，创建一个vm的方式那就是可以直接全抠。

window.a1 = function(p, a, c, k, e, r) {e = function(c) {return (c < a ? '' : e(parseInt(c / a))) + ((c = c % a) > 35 ? String.fromCharCode(c + 29) : c.toString(36))};if (!''.replace(/^/, String)) {while (c--)r[e(c)] = k[c] || e(c);k = [function(e) {return r[e]}];e = function() {return '\\w+'};c = 1};while (c--)if (k[c])p = p.replace(new RegExp('\\b' + e(c) + '\\b','g'), k[c]);return p
}

抠出方法来改写运行将自执行的参数填入，最后在控制台运行得到混淆前的代码。

最后得到这段字符串代码。

(function(){var m=["clstag","id","tdtag","class"],u=0,v="",w="click blur focus change scroll input keydown keypress keyup".split(" "),x="onclick onblur onfocus onchange onscroll onpropertychange onkeydown onkeypress onkeyup".split(" "),A=("https:"==document.location.protocol?"https://":"http://")+"seq.jd.com/jseq.html",k="click input change focus blur scroll keydown keypress keyup sniffV sniffL".split(" "),B={49:"a",50:"a",51:"a",52:"a",53:"a",54:"a",55:"a",56:"a",57:"a",48:"a",96:"a",97:"a",98:"a",99:"a",100:"a",101:"a",102:"a",103:"a",104:"a",105:"a",81:"b",87:"b",69:"b",82:"b",84:"b",89:"b",85:"b",73:"b",79:"b",80:"b",65:"b",83:"b",68:"b",70:"b",71:"b",90:"b",88:"b",72:"b",74:"b",75:"b",76:"b",67:"b",86:"b",66:"b",78:"b",77:"b",192:"c",189:"c",187:"c",219:"c",221:"c",220:"c",186:"c",222:"c",188:"c",190:"c",191:"c",111:"c",106:"c",109:"c",107:"c",110:"c",32:"c"};this.init=function(){if(!("undefined"==typeof _jdtdseq_config_data||null==_jdtdseq_config_data||0>=_jdtdseq_config_data.length)){var a=_jdtdseq_config_data.bizId;globalUnixstamp(a);scrollSeq(window,joinReturnObj(null,null,a,"0",k[5]));for(var b=_jdtdseq_config_data.seqs,e=0;e<b.length;e++){var c=b[e];var d=null;var g=c.selVal;switch(c.selType){case m[0]:d=y("["+m[0]+"='"+g+"']")[0];break;case m[1]:d=document.getElementById(g);break;case m[2]:d=y("["+m[2]+"='"+g+"']")[0];break;case m[3]:d=g;if(document.getElementsByClassName)d=document.getElementsByClassName(d);else{g=document.getElementsByTagName("*");for(var h=[],f=0;f<g.length;f++)for(var z=g[f],q=z.className.split(" "),p=0;p<q.length;p++)if(q[p]==d){h.push(z);break}d=h}d=d[0]}if(null!=d&&void 0!=d)for(g=0;g<c.seq.length;g++)switch(h=c.seq[g],f={},f.bizId=a,f.elementId=c.elementId,f.seq=h,f.sessionId=_jdtdmap_sessionId,f.special=c.special,h){case k[0]:clickCount(d,f);break;case k[1]:inputEvent(d,f);break;case k[2]:changeEvent(d,f);break;case k[3]:focusEvent(d,f);break;case k[4]:blurEvent(d,f);break;case k[5]:scrollSeq(d,f);break;case k[6]:keyDownEvent(d,f);break;case k[7]:keyPressEvent(d,f);break;case k[8]:keyUpEvent(d,f);break;case k[9]:sniffV(d,f);break;case k[10]:sniffL(d,f)}}}};this.globalUnixstamp=function(a){var b=joinReturnObj(null,"1",a,"0",k[3]);n(b);l(window,2,function(){return joinReturnObj(null,"1",a,"0",k[3])});l(window,1,function(){return joinReturnObj(null,"1",a,"0",k[4])})};this.clickCount=function(a,b){l(a,0,function(){return b=joinReturnObj(b,"1")})};this.focusEvent=function(a,b){l(a,2,function(){return b=joinReturnObj(b,"1")})};this.blurEvent=function(a,b){l(a,1,function(){return b=joinReturnObj(b,"1")})};this.changeEvent=function(a,b){l(a,3,function(){return b=joinReturnObj(b,a.value.length)})};this.inputEvent=function(a,b){l(a,5,function(){return b=joinReturnObj(b,a.value.length)})};this.scrollSeq=function(a,b){l(a,4,function(){return b=joinReturnObj(b,document.documentElement.scrollTop||document.body.scrollTop)})};this.keyDownEvent=function(a,b){l(a,6,function(a,c){c=c||window.event;a=c.keyCode&&0<c.keyCode?c.keyCode:c.which;a="undefined"==typeof a?c.charCode:a;"1"==b.special&&(a=r(a));return joinReturnObj(b,a)})};this.keyPressEvent=function(a,b){l(a,7,function(a,c){c=c||window.event;a=c.keyCode&&0<c.keyCode?c.keyCode:c.which;a="undefined"==typeof a?c.charCode:a;"1"==b.special&&(a=r(a));return joinReturnObj(b,a)})};this.keyUpEvent=function(a,b){l(a,8,function(a,c){c=c||window.event;a=c.keyCode&&0<c.keyCode?c.keyCode:c.which;a="undefined"==typeof a?c.charCode:a;"1"==b.special&&(a=r(a));return joinReturnObj(b,a)})};this.sniffV=function(a,b){a=a?a.value:"unknow";commonFn();b=joinReturnObj(b,a);n(b)};this.sniffL=function(a,b){function e(b){b=b||event;1==++g&&(t()?document.documentElement.detachEvent("onmousedown",e):document.documentElement.removeEventListener("mousedown",e),d=a.value,c(b.clientX,b.clientY))}function c(a,c){commonFn();a=joinReturnObj(b,("unknow"==d?d:d.length)+"_"+a+"_"+c);n(a)}var d=a?a.value:"unknow",g=0;""==d?t()?document.documentElement.attachEvent("onmousedown",e):document.documentElement.addEventListener("mousedown",e):c("a","a")};this.commonFn=function(){++u};this.joinReturnObj=function(a,b,e,c,d){function g(){function a(){try{var a=getJdEid();if(void 0!=a&&null!=a&&"object"==typeof a)var b=a.eid}catch(p){}return b}var b=function(){var a;try{getJdEid(function(b){a=b})}catch(q){}return a}();if(void 0==b||null==b||""==b)b=a();return b}try{v=g()}catch(h){}void 0==a&&null==a&&(a={version:"1.0"},a.bizId=e,a.elementId=c,a.seq=d);a.sessionId=_jdtdmap_sessionId;a.sp=u;a.version="1.0";a.eid=v;a.val=b;a.ctime=(new Date).getTime();return a};var t=function(){if(window.attachEvent)return!0},l=function(a,b,e){t()?0<x[b].length&&a.attachEvent(x[b],function(b){commonFn();b=e(a,b);n(b)}):0<w[b].length&&a.addEventListener(w[b],function(b){commonFn();b=e(a,b);n(b)})},n=function(a){if("undefined"==typeof _jdtdseq_config_s||"false"!=_jdtdseq_config_s&&0!=_jdtdseq_config_s){a=C(a);var b="";"undefined"!=typeof pin&&(b=pin);var e="";try{e=encodeURI(window.location.href)}catch(c){}D(A,{d:a,p:b,loc:e},"callback",function(a){})}},D=function(a,b,e,c,d){var g="jsonp_"+Math.random();g=g.replace(".","");window[g]=function(a){clearTimeout(h);window[g]=null;l.removeChild(k);c(a)};var h=setTimeout(function(){window[g]=null;l.removeChild(k);d&&d()},1E4);b[e]=g;e=[];for(var f in b)e.push(f+"="+b[f]);a=a+"?"+e.join("&");var k=document.createElement("script");k.src=a;k.type="text/javascript";var l=document.getElementsByTagName("head")[0];l.appendChild(k)},y=function(a,b){var e=/([\\*a-zA-Z1-6]*)?(\\[(\\w+)\\s*(\\^|\\$|\\*|\\||~|!)?=?\\s*([\\w\\u00C0-\\uFFFF\\s\\-_\\.]+)?\\])?/,c=b||document,d=a.match(e);e=d[1]||"*";b=d[3];var g=d[4]+"=",h=d[5],f={"class":"className","for":"htmlFor"};d=[];e="*"===e&&c.all?c.all:c.getElementsByTagName(e);c=e.length;if(document.querySelectorAll&&"!="!=g){e=document.querySelectorAll(a);b=0;for(c=e.length;b<c;b++)d.push(e[b]);return d}for(+"\\v1"||(b=f[b]?f[b]:b);0<=--c;)a=e[c],f=+"\\v1"?a.getAttribute(b):a[b],"string"===typeof f&&0<f.length&&(h?("="===g?f===h:"!="===g?f!=h:"*="===g?0<=f.indexOf(h):"~="===g?0<=(" "+f+" ").indexOf(h):"^="===g?0===f.indexOf(h):"$="===g?f.slice(-f.length)===h:"|="===g&&(f===h||f.substring(0,h.length+1)===h+"-"))&&d.push(a):d.push(a));return d},E=function(a){this.tdmovebit=function(){var a=10,b=20,c=30;++a;a++;a=++a+ ++b+c++ +a++;return d+a-76};var b="23IL";a=encodeURIComponent(a);var e="",c="";b+="<N01c7KvwZO56RSTAfghiFyzWJqVabGH4PQdopUrsCuX*xeBjkltDEmn89.-";var d=0;var g="";do{var h=a.charCodeAt(d);d=this.tdmovebit(d);var f=a.charCodeAt(d);d=this.tdmovebit(d);e=a.charCodeAt(d);d=this.tdmovebit(d);var k=h>>Math.round(((19<<43)/90^34)/214);h=(h&3)<<4|f>>4;var l=(f&15)<<2|e>>6;c=e&Math.round(((19<<43)/90^34)/6)-4;isNaN(f)?l=c=Math.round(((19<<43)/90^34)/6)-3:isNaN(e)&&(c=Math.round(((19<<43)/90^34)/6)-3);g=g+b.charAt(k)+b.charAt(h)+b.charAt(l)+b.charAt(c);k=h=l=c=h=f=e=""}while(d<=a.length);return g+"/"},C=function(a){if(void 0==a||null==a)return null;var b="{",e;for(e in a)b+="'"+e+"':",b="string"==typeof a[e]?b+("'"+a[e]+"'"):b+a[e],b+=",";b=b.substring(0,b.length-1);return E(b+"}")},r=function(a){var b=B[a];return b?b:a};this.init()})();

格式化后运行看一下是否有window._jdtdmap_sessionId｜window[‘_jdtdmap_sessionId’]｜window[“_jdtdmap_sessionId”]有就说明是成功的，因为是自执行里面必须会有window对象。

(function () {var m = ["clstag", "id", "tdtag", "class"], u = 0, v = "",w = "click blur focus change scroll input keydown keypress keyup".split(" "),x = "onclick onblur onfocus onchange onscroll onpropertychange onkeydown onkeypress onkeyup".split(" "),A = ("https:" == document.location.protocol ? "https://" : "http://") + "seq.jd.com/jseq.html",k = "click input change focus blur scroll keydown keypress keyup sniffV sniffL".split(" "), B = {49: "a",50: "a",51: "a",52: "a",53: "a",54: "a",55: "a",56: "a",57: "a",48: "a",96: "a",97: "a",98: "a",99: "a",100: "a",101: "a",102: "a",103: "a",104: "a",105: "a",81: "b",87: "b",69: "b",82: "b",84: "b",89: "b",85: "b",73: "b",79: "b",80: "b",65: "b",83: "b",68: "b",70: "b",71: "b",90: "b",88: "b",72: "b",74: "b",75: "b",76: "b",67: "b",86: "b",66: "b",78: "b",77: "b",192: "c",189: "c",187: "c",219: "c",221: "c",220: "c",186: "c",222: "c",188: "c",190: "c",191: "c",111: "c",106: "c",109: "c",107: "c",110: "c",32: "c"};this.init = function () {if (!("undefined" == typeof _jdtdseq_config_data || null == _jdtdseq_config_data || 0 >= _jdtdseq_config_data.length)) {var a = _jdtdseq_config_data.bizId;globalUnixstamp(a);scrollSeq(window, joinReturnObj(null, null, a, "0", k[5]));for (var b = _jdtdseq_config_data.seqs, e = 0; e < b.length; e++) {var c = b[e];var d = null;var g = c.selVal;switch (c.selType) {case m[0]:d = y("[" + m[0] + "='" + g + "']")[0];break;case m[1]:d = document.getElementById(g);break;case m[2]:d = y("[" + m[2] + "='" + g + "']")[0];break;case m[3]:d = g;if (document.getElementsByClassName) d = document.getElementsByClassName(d); else {g = document.getElementsByTagName("*");for (var h = [], f = 0; f < g.length; f++) for (var z = g[f], q = z.className.split(" "), p = 0; p < q.length; p++) if (q[p] == d) {h.push(z);break}d = h}d = d[0]}if (null != d && void 0 != d) for (g = 0; g < c.seq.length; g++) switch (h = c.seq[g], f = {}, f.bizId = a, f.elementId = c.elementId, f.seq = h, f.sessionId = _jdtdmap_sessionId, f.special = c.special, h) {case k[0]:clickCount(d, f);break;case k[1]:inputEvent(d, f);break;case k[2]:changeEvent(d, f);break;case k[3]:focusEvent(d, f);break;case k[4]:blurEvent(d, f);break;case k[5]:scrollSeq(d, f);break;case k[6]:keyDownEvent(d, f);break;case k[7]:keyPressEvent(d, f);break;case k[8]:keyUpEvent(d, f);break;case k[9]:sniffV(d, f);break;case k[10]:sniffL(d, f)}}}};this.globalUnixstamp = function (a) {var b = joinReturnObj(null, "1", a, "0", k[3]);n(b);l(window, 2, function () {return joinReturnObj(null, "1", a, "0", k[3])});l(window, 1, function () {return joinReturnObj(null, "1", a, "0", k[4])})};this.clickCount = function (a, b) {l(a, 0, function () {return b = joinReturnObj(b, "1")})};this.focusEvent = function (a, b) {l(a, 2, function () {return b = joinReturnObj(b, "1")})};this.blurEvent = function (a, b) {l(a, 1, function () {return b = joinReturnObj(b, "1")})};this.changeEvent = function (a, b) {l(a, 3, function () {return b = joinReturnObj(b, a.value.length)})};this.inputEvent = function (a, b) {l(a, 5, function () {return b = joinReturnObj(b, a.value.length)})};this.scrollSeq = function (a, b) {l(a, 4, function () {return b = joinReturnObj(b, document.documentElement.scrollTop || document.body.scrollTop)})};this.keyDownEvent = function (a, b) {l(a, 6, function (a, c) {c = c || window.event;a = c.keyCode && 0 < c.keyCode ? c.keyCode : c.which;a = "undefined" == typeof a ? c.charCode : a;"1" == b.special && (a = r(a));return joinReturnObj(b, a)})};this.keyPressEvent = function (a, b) {l(a, 7, function (a, c) {c = c || window.event;a = c.keyCode && 0 < c.keyCode ? c.keyCode : c.which;a = "undefined" == typeof a ? c.charCode : a;"1" == b.special && (a = r(a));return joinReturnObj(b, a)})};this.keyUpEvent = function (a, b) {l(a, 8, function (a, c) {c = c || window.event;a = c.keyCode && 0 < c.keyCode ? c.keyCode : c.which;a = "undefined" == typeof a ? c.charCode : a;"1" == b.special && (a = r(a));return joinReturnObj(b, a)})};this.sniffV = function (a, b) {a = a ? a.value : "unknow";commonFn();b = joinReturnObj(b, a);n(b)};this.sniffL = function (a, b) {function e(b) {b = b || event;1 == ++g && (t() ? document.documentElement.detachEvent("onmousedown", e) : document.documentElement.removeEventListener("mousedown", e), d = a.value, c(b.clientX, b.clientY))}function c(a, c) {commonFn();a = joinReturnObj(b, ("unknow" == d ? d : d.length) + "_" + a + "_" + c);n(a)}var d = a ? a.value : "unknow", g = 0;"" == d ? t() ? document.documentElement.attachEvent("onmousedown", e) : document.documentElement.addEventListener("mousedown", e) : c("a", "a")};this.commonFn = function () {++u};this.joinReturnObj = function (a, b, e, c, d) {function g() {function a() {try {var a = getJdEid();if (void 0 != a && null != a && "object" == typeof a) var b = a.eid} catch (p) {}return b}var b = function () {var a;try {getJdEid(function (b) {a = b})} catch (q) {}return a}();if (void 0 == b || null == b || "" == b) b = a();return b}try {v = g()} catch (h) {}void 0 == a && null == a && (a = {version: "1.0"}, a.bizId = e, a.elementId = c, a.seq = d);a.sessionId = _jdtdmap_sessionId;a.sp = u;a.version = "1.0";a.eid = v;a.val = b;a.ctime = (new Date).getTime();return a};var t = function () {if (window.attachEvent) return !0}, l = function (a, b, e) {t() ? 0 < x[b].length && a.attachEvent(x[b], function (b) {commonFn();b = e(a, b);n(b)}) : 0 < w[b].length && a.addEventListener(w[b], function (b) {commonFn();b = e(a, b);n(b)})}, n = function (a) {if ("undefined" == typeof _jdtdseq_config_s || "false" != _jdtdseq_config_s && 0 != _jdtdseq_config_s) {a = C(a);var b = "";"undefined" != typeof pin && (b = pin);var e = "";try {e = encodeURI(window.location.href)} catch (c) {}D(A, {d: a, p: b, loc: e}, "callback", function (a) {})}}, D = function (a, b, e, c, d) {var g = "jsonp_" + Math.random();g = g.replace(".", "");window[g] = function (a) {clearTimeout(h);window[g] = null;l.removeChild(k);c(a)};var h = setTimeout(function () {window[g] = null;l.removeChild(k);d && d()}, 1E4);b[e] = g;e = [];for (var f in b) e.push(f + "=" + b[f]);a = a + "?" + e.join("&");var k = document.createElement("script");k.src = a;k.type = "text/javascript";var l = document.getElementsByTagName("head")[0];l.appendChild(k)}, y = function (a, b) {var e = /([\\*a-zA-Z1-6]*)?(\\[(\\w+)\\s*(\\^|\\$|\\*|\\||~|!)?=?\\s*([\\w\\u00C0-\\uFFFF\\s\\-_\\.]+)?\\])?/,c = b || document, d = a.match(e);e = d[1] || "*";b = d[3];var g = d[4] + "=", h = d[5], f = {"class": "className", "for": "htmlFor"};d = [];e = "*" === e && c.all ? c.all : c.getElementsByTagName(e);c = e.length;if (document.querySelectorAll && "!=" != g) {e = document.querySelectorAll(a);b = 0;for (c = e.length; b < c; b++) d.push(e[b]);return d}for (+"\\v1" || (b = f[b] ? f[b] : b); 0 <= --c;) a = e[c], f = +"\\v1" ? a.getAttribute(b) : a[b], "string" === typeof f && 0 < f.length && (h ? 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})();

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