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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 = $('#pubKey').val(); if(!pwd || !pubKey || !SysConfig.encryptInfo){ return pwd; } var encrypt = new JSEncrypt(); encrypt.setPublicKey(pubKey); return encrypt.encrypt(pwd); }- 1
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这里可以看到$(‘#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 }- 1
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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+="- 1
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 ? ("=" === 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 += "- 1
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4. 工具分享
公z号: 阿呆攻防- 1
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- 原文地址：https://blog.csdn.net/yw99999/article/details/126126584