python爬虫 - js逆向之猿人学第十六题webpack，忽略obfuscator
前言
好久没有写猿人学的分析了，今天来分析一波
打开网址：
同样的，也很轻易的拿到接口，
然后这个接口里的请求参数又是迷人的m，m就是我们的目标了
分析
老规矩，搜索：
搜一堆出来，感觉都不太靠谱
那咋办？先看特征，看这个长度是多少的，卧槽，这个长度有点少见了
点调用栈看看：
看到这个就很可疑了
为啥这么说，dispatch分发请求，匿名函数操作，实际的request，所以，关键的逻辑一定在这个request或者匿名函数anonymous前后，再看js名字就叫webpack，那就是webpack打包的，那前面才分析过webpack的东西，不用怕，点进去看：
进来都到这里，打上断点，翻页看看，这不就找到了吗，看着webpack唬人，感觉没两样啊
然后看逻辑，m的值就是n[e(528)](btoa, p_s)生成的了，然后传入的参数btoa，这个可以直接调用，不用多说，再看后面的p_s，定义就在上面，那就只剩n[e(528)]这个不知道啥东西了，鼠标放上去，发现，这个就是前面说的匿名函数anonymous了
点过去，发现就在上面，然后看逻辑，第一个参数是个函数，然后把第二个参数传入函数直接返回，这个不就是python里的装饰器嘛，
那么，也就是说，实际的加密逻辑就是btoa(p_s)
控制台操作下：
这不就出来了吗
然后，前面js逆向安全专题里说了，btoa就是个base64的函数，直接忽略了，python里直接就有，主要是后面的这个参数：
p_s = Date[e(496)](new Date)[e(517)]()
时间相关的都好说，就差这个e(517)和e(496)了，控制台看是啥东西：
最后的结果：
然后这个时间戳的话，是毫秒级别的，13位
调试
那行，直接在python里搞一个看行不行
突然感觉跟预期的有点不一样，这个长度不对啊
首先，整个结果就不对的，
然后再用node操作也报错：
从node版本16开始，原生支持atob,btoa，但是之前不支持
拿得从长记忆了，控制台打印下：
双击返回的，进入，如下，这他妈一看，典型的obfuscator混淆啊（别问我怎么看出来的）
既然是ob，先把这个btoa的上级整个抠出来的，此时有两套方案
- 第一个可以用ast对ob混淆反混淆，然后整体逻辑就会很清晰，后续就能很快解决问题，前提得回ast，且熟悉ob混淆逻辑
- 第二个不用反混淆，直接补环境也是可以的，但是这个补环境时，如果环境没补好，容易出现错误的结果
ob混淆的话，得花好几期的博客文章才能说清楚，为了照顾对这方面不太理解的朋友，所以我选用第二个方案，补环境，抠代码：
如下，抠出来后，执行,
把u补上，找到u:
补上并执行：
继续补_0x34e7并执行：
补f，同同时，把标注出来的删了
补完，这里的f用了u，所以要放在u下面
继续补d
继续补window
补md5
补n，其实这里看到，这个n就是webpack的加载器，或者叫分发器
出现如下，r，但是刚才的n并没有带入参数啊，
再看源站里的，此时才发下，n并不是刚才定位到的，而是上面的n
所以还是不能信鼠标放上去的跳转啊，尤其这种就一个字母，很容易链接错，因为作用域的问题，你很有可能链接到同名的其他地方去了，像上面就是
看到用了个_0x4c28，干脆把这里都复制下来：
执行，终于有结果了
调试
然后再在浏览器里执行看看，注意，我直接把window = global删了，window.md5直接改成了md5，因为浏览器环境里自带有window对象，所以不用补了
结果也是有的，那么怎么确定这个结果就跟官方的一样呢，用同一个时间地址就可以了：
先看，这是官方的结果：
把这个值直接放到扣出来的代码执行，node里：
浏览器的source - snippet里
三个值都不一样，那多半也没法用啊，哪里有问题呢？
再从头看下：
应该就是检测了环境，刚才补的环境还是有问题，想到刚才的delete那里：
这里只能一行一行看了，可以对这里打上断点一点点看了：
然后这里看到这个n:
刚才我们也补了一个n，对比下区别，下面是自己补的，这个值明显就不对了啊，怎么办
看到源网站的n:
那就把相关的都补上吧，放在for循环上边点：
好的，现在看，然后发现，即使我把时间写死了，每次执行还是会有不同的结果，那就不多说了，直接拿来请求看看能不能有正常结果吧，先稍微改下js文件：
python调用：
那就可以，整理下求和吧
填入答案：
js代码：
window = global;
var e, t;
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e = _0x4c28,
t = 368,
function (t) {
for (; --t;)
e.push(e.shift())
}(++t);
var n = function (e, t) {
return _0x4c28[e -= 0]
};
window.md5 = function (e) {
var t = n
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continue;
case "23":
T = i[r(67)](c, T, w, b, x, e[d + 14], 15, -1416354905);
continue;
case "24":
b = s(b, x, T, w, e[i[r(123)](d, 4)], 7, -176418897);
continue;
case "25":
w = i.UXeVn(u, w, b, x, T, e[d + 0], 11, -358537222);
continue;
case "26":
b = i.UXeVn(l, b, x, T, w, e[i[r(62)](d, 1)], 5, -165796510);
continue;
case "27":
b = i.UXeVn(u, b, x, T, w, e[i[r(62)](d, 13)], 4, 681279174);
continue;
case "28":
b = i[r(12)](l, b, x, T, w, e[i[r(138)](d, 9)], 5, 568446438);
continue;
case "29":
w = i.yMPhx(c, w, b, x, T, e[d + 7], 10, 11261161415);
continue;
case "30":
var g = w;
continue;
case "31":
b = c(b, x, T, w, e[i.yGmJD(d, 8)], 6, 1873313359);
continue;
case "32":
x = i.aFxRD(f, x, y);
continue;
case "33":
T = i[r(12)](l, T, w, b, x, e[i[r(121)](d, 15)], 14, -660478335);
continue;
case "34":
T = i.kHuTw(u, T, w, b, x, e[d + 3], 16, -722881979);
continue;
case "35":
b = i[r(50)](l, b, x, T, w, e[i[r(121)](d, 5)], 5, -701520691);
continue;
case "36":
T = l(T, w, b, x, e[i[r(121)](d, 3)], 14, -187363961);
continue;
case "37":
T = i[r(142)](u, T, w, b, x, e[i.QgSUn(d, 7)], 16, -155497632);
continue;
case "38":
b = i.FcXlo(u, b, x, T, w, e[i.koePJ(d, 5)], 4, -378558);
continue;
case "39":
w = i[r(142)](u, w, b, x, T, e[i[r(90)](d, 12)], 11, -421815835);
continue;
case "40":
T = i[r(59)](u, T, w, b, x, e[i[r(28)](d, 15)], 16, 530742520);
continue;
case "41":
x = i.wvVCN(s, x, T, w, b, e[d + 15], 22, 1236531029);
continue;
case "42":
x = i[r(59)](l, x, T, w, b, e[i[r(119)](d, 4)], 20, -405537848);
continue;
case "43":
b = i[r(59)](s, b, x, T, w, e[i.lvwPz(d, 0)], 7, -680976936);
continue;
case "44":
b = i[r(59)](u, b, x, T, w, e[i[r(45)](d, 1)], 4, -1530992060);
continue;
case "45":
x = i.nCrbn(u, x, T, w, b, e[i[r(129)](d, 14)], 23, -35311556);
continue;
case "46":
b = c(b, x, T, w, e[i[r(42)](d, 12)], 6, 1700485571);
continue;
case "47":
x = i[r(7)](u, x, T, w, b, e[i.kaQlD(d, 2)], 23, -995338651);
continue;
case "48":
T = c(T, w, b, x, e[d + 6], 15, -1560198380);
continue;
case "49":
w = i[r(145)](l, w, b, x, T, e[i[r(107)](d, 6)], 9, -1069501632);
continue;
case "50":
x = i[r(134)](c, x, T, w, b, e[i[r(89)](d, 1)], 21, -2054922799);
continue;
case "51":
x = i.fmdcS(l, x, T, w, b, e[d + 8], 20, 1163531501);
continue;
case "52":
x = i[r(15)](c, x, T, w, b, e[i[r(9)](d, 13)], 21, 1309151649);
continue;
case "53":
x = i[r(15)](s, x, T, w, b, e[i[r(56)](d, 11)], 22, -1990404162);
continue;
case "54":
w = i[r(6)](s, w, b, x, T, e[i[r(32)](d, 13)], 12, -40341101);
continue;
case "55":
x = i.sFtiw(s, x, T, w, b, e[i.UAFHv(d, 7)], 22, -45705983);
continue;
case "56":
T = i.sFtiw(s, T, w, b, x, e[i.MFmWH(d, 6)], 17, -1473231341);
continue;
case "57":
w = i[r(99)](s, w, b, x, T, e[i.MFmWH(d, 1)], 12, -389564586);
continue;
case "58":
x = c(x, T, w, b, e[i[r(39)](d, 9)], 21, -343485551);
continue;
case "59":
b = i[r(113)](c, b, x, T, w, e[i[r(39)](d, 4)], 6, -145523070);
continue;
case "60":
T = i.bRLIN(s, T, w, b, x, e[i[r(39)](d, 10)], 17, -42063);
continue;
case "61":
var v = T;
continue;
case "62":
b = i[r(66)](c, b, x, T, w, e[d + 0], 6, -198630844);
continue;
case "63":
w = i[r(66)](c, w, b, x, T, e[i[r(13)](d, 15)], 10, -30611744);
continue;
case "64":
x = c(x, T, w, b, e[d + 5], 21, -57434055);
continue;
case "65":
T = i[r(29)](l, T, w, b, x, e[i[r(13)](d, 7)], 14, 1735328473);
continue;
case "66":
w = i[r(29)](c, w, b, x, T, e[i[r(79)](d, 11)], 10, -1120210379);
continue;
case "67":
var y = x;
continue;
case "68":
w = i[r(1)](l, w, b, x, T, e[d + 10], 9, 38016083);
continue;
case "69":
T = i[r(1)](s, T, w, b, x, e[i[r(79)](d, 14)], 17, -1502002290);
continue;
case "70":
T = i.SUrST(c, T, w, b, x, e[i[r(79)](d, 2)], 15, 718787259);
continue;
case "71":
T = l(T, w, b, x, e[i[r(81)](d, 11)], 14, 643717713);
continue
}
break
}
continue;
case "1":
var b = 1732584193;
continue;
case "2":
return Array(b, x, T, w);
case "3":
e[i.MXnIN(n, 5)] |= i[r(23)](128, i[r(54)](n, 32));
continue;
case "4":
var x = -271733879;
continue;
case "5":
var w = 271733878;
continue;
case "6":
e[i.BQgZQ(i[r(115)](n + 64, 9), 4) + 14] = n;
continue;
case "7":
var T = -1732584194;
continue
}
break
}
}
function a(e, n, r, o, a, s) {
var l = t;
return f(i.BtzmV(d, i[l(44)](f, i.dbmfK(f, n, e), i[l(30)](f, o, s)), a), r)
}
function s(e, n, r, o, s, l, u) {
var c = t;
return a(i[c(143)](i[c(101)](n, r), i[c(101)](~n, o)), e, n, s, l, u)
}
function l(e, n, r, o, s, l, u) {
var c = t;
return i[c(122)](a, i[c(143)](i.ZpUiH(n, o), i.ZpUiH(r, ~o)), e, n, s, l, u)
}
function u(e, n, r, o, s, l, u) {
return i[t(122)](a, i.tsNzQ(n ^ r, o), e, n, s, l, u)
}
function c(e, n, r, o, s, l, u) {
var c = t;
return i[c(122)](a, i[c(130)](r, i[c(41)](n, ~o)), e, n, s, l, u)
}
function f(e, n) {
var r = t
, o = i[r(95)](65535 & e, i.iqfMz(n, 65535))
, a = i[r(95)](e >> 16, i[r(97)](n, 16)) + i[r(97)](o, 16);
return i[r(103)](i[r(84)](a, 16), i[r(105)](o, 65535))
}
function d(e, n) {
var r = t;
return i.abYok(e << n, e >>> i[r(8)](32, n))
}
function p(e) {
for (var n = t, r = i[n(137)](Array), o = i[n(8)](i.vRqUp(1, 16), 1), a = 0; a < i.FDfcp(e[n(108)], 16); a += 16)
r[i[n(97)](a, 5)] |= i[n(102)](i[n(27)](e[n(127)](i[n(26)](a, 16)), o), i[n(54)](a, 32));
return r
}
function h(e) {
for (var n = t, r = i[n(49)], o = "", a = 0; i.iXQwu(a, i[n(74)](e[n(108)], 4)); a++)
o += i.xgzfr(r[n(64)](15 & i[n(36)](e[i[n(36)](a, 2)], i[n(46)](i[n(74)](a % 4, 8), 4))), r[n(64)](15 & i.wWwRM(e[a >> 2], i[n(47)](a % 4, 8))));
return o
}
return i[t(0)]((function (e) {
var n = t;
return i[n(144)](h, i[n(76)](o, i.vyNVU(p, e), 16 * e[n(108)]))
}
), e)
}
var _0x34e7 = [
"split",
"ABHICESQWK",
"FKByN",
"U987654321",
"lmHcG",
"dICfr",
"Szksx",
"Bgrij",
"iwnNJ",
"jihgfdecba",
"GfTek",
"gfdecbaZXY",
"constructo",
"QIoXW",
"jLRMs",
"AqLWq",
"0zyxwvutsr",
"TKgNw",
"eMnqD",
"thjIz",
"btoa",
"MNPQRSTWXY",
"oPsqh",
"niIlq",
"evetF",
"LVZVH",
"fYWEX",
"kmnprstwxy",
"aYkvo",
"tsrqpomnlk",
"HfLqY",
"aQCDK",
"lGBLj",
"test",
"3210zyxwvu",
"QWK2Fi",
"return /\" ",
"hsJtK",
"jdwcO",
"SlFsj",
"OWUOc",
"LCaAn",
"[^ ]+)+)+[",
"FAVYf",
"2Fi+987654",
"floor",
"join",
"EuwBW",
"OXYrZ",
"charCodeAt",
"SkkHG",
"iYuJr",
"GwoYF",
"kPdGe",
"cVCcp",
"INQRH",
"INVALID_CH",
"charAt",
"push",
"apply",
"lalCJ",
"kTcRS",
"+ this + \"",
"ykpOn",
"gLnjm",
"gmBaq",
"kukBH",
"dvEWE",
"SFKLi",
"^([^ ]+( +",
"qpomnlkjih",
"^ ]}",
"pHtmC",
"length"
]
var l = function (e, t) {
return _0x34e7[e -= 188]
}
, u = l
function d(e) {
var t = u
, n = {};
n[t(214)] = function (e, t) {
return e || t
}
,
n.bWcgB = function (e, t) {
return e * t
}
,
n[t(227)] = "ABCDEFGHJK" + t(209) + "Zabcdefhij" + t(215) + "z2345678";
for (var r = n, o = "1|3|0|4|2|5"[t(188)]("|"), a = 0; ;) {
switch (o[a++]) {
case "0":
var s = l[t(261)];
continue;
case "1":
e = r[t(214)](e, 32);
continue;
case "2":
for (i = 0; i < e; i++)
c += l[t(245)](Math[t(233)](r.bWcgB(Math.random(), s)));
continue;
case "3":
var l = r[t(227)];
continue;
case "4":
var c = "";
continue;
case "5":
return c
}
break
}
}
function btoa(e) {
var t = u,
r = {};
var f = u(191) + u(204) + u(258) + u(199) + "WVUTSRQPON" + u(189) + u(232) + u(222) + u(217) + u(197) + "ZXYWVUTSRQPONABHICES" + u(223);
r.TGmSp = t(244) + "ARACTER_ERR", r[t(238)] = t(224) + t(250) + "/", r[t(205)] = "^([^ ]+( +" + t(230) + t(259), r.aYkvo = function (e) {
return e();
}, r[t(254)] = function (e, t) {
return e % t;
}, r.evetF = function (e, t) {
return e >> t;
}, r.GfTek = t(196), r[t(260)] = function (e, t) {
return e << t;
}, r[t(229)] = function (e, t) {
return e | t;
}, r[t(242)] = function (e, t) {
return e << t;
}, r[t(228)] = function (e, t) {
return e & t;
}, r[t(207)] = function (e, t) {
return e << t;
}, r[t(202)] = function (e, t) {
return e & t;
}, r.jdwcO = function (e, t) {
return e === t;
}, r.kPdGe = t(231), r[t(195)] = t(213), r[t(201)] = function (e, t) {
return e & t;
}, r[t(206)] = function (e, t) {
return e == t;
}, r[t(219)] = function (e, t) {
return e + t;
}, r[t(220)] = function (e, t) {
return e(t);
};
var i = r;
if (/([^\u0000-\u00ff])/.test(e)) {
throw new Error(i.TGmSp);
}
function n(r) {
if (t[r])
return t[r].exports;
var i = t[r] = {
exports: {}
};
return e[r].call(i.exports, i, i.exports, n),
i.exports
}
n.g = function () {
if ("object" == typeof globalThis)
return globalThis;
try {
return this || new Function("return this")()
} catch (e) {
if ("object" == typeof window)
return window
}
}()
for (var o, a, s, l = 0, c = []; l < e[t(261)];) {
switch (a = e[t(237)](l), s = i.kukBH(l, 6)) {
case 0:
c[t(246)](f[t(245)](i[t(212)](a, 2)));
break;
case 1:
try {
"WhHMm" === i[t(198)] || n.g && c[t(246)](f[t(245)](i.pHtmC(2 & o, 3) | i.evetF(a, 4)));
} catch (e) {
c[t(246)](f[t(245)](i[t(229)](i.cVCcp(3 & o, 4), a >> 4)));
}
break;
case 2:
c[t(246)](f[t(245)](i[t(229)](i[t(242)](15 & o, 2), i.evetF(a, 6)))), c[t(246)](f[t(245)](i[t(228)](a, 63)));
break;
case 3:
c[t(246)](f[t(245)](i[t(212)](a, 3)));
break;
case 4:
c.push(f[t(245)](i[t(229)](i[t(207)](i.OWUOc(o, 4), 6), i[t(212)](a, 6))));
break;
case 5:
c[t(246)](f[t(245)](i[t(229)](i[t(207)](i[t(202)](o, 15), 4), a >> 8))), c.push(f.charAt(i[t(202)](a, 63)));
}
o = a, l++;
}
return 0 == s ? i[t(226)](i[t(241)], i[t(195)]) || (c[t(246)](f[t(245)](i[t(201)](o, 3) << 4)), c.push("FM")) : i.eMnqD(s, 1) && (c[t(246)](f[t(245)]((15 & o) << 2)), c[t(246)]("K")), i[t(219)](i.aQCDK(d(15), window.md5(c[t(234)](""))), i[t(220)](d, 10));
}
function get_m() {
kk = Date.parse(new Date).toString()
console.log(kk)
return [btoa(kk), kk]
}
console.log(get_m())
python代码：
import requests
headers = {
"authority": "match.yuanrenxue.com",
"x-requested-with": "XMLHttpRequest",
"sec-ch-ua-mobile": "?0",
'cookie': 'sessionid=换成你的sessionid',
"user-agent": "yuanrenxue.project",
"sec-ch-ua-platform": "\"Windows\"",
"sec-fetch-site": "same-origin",
"sec-fetch-mode": "cors",
"sec-fetch-dest": "empty",
"referer": "https://match.yuanrenxue.com/match/16",
"accept-language": "zh-CN,zh;q=0.9"
}
url = "https://match.yuanrenxue.com/api/match/16"
def get_m():
import execjs
with open('get_m.js') as f:
cont = f.read()
js = execjs.compile(cont)
result = js.call('get_m')
m, ts = result
return m, ts
def get_page(page):
m, ts = get_m()
params = {
"page": page,
"m": m,
"t": ts
}
with requests.get(url, headers=headers, params=params) as response:
print(1232123123,response)
result = response.json()
data = result.get('data')
return [d.get('value') for d in data]
def get_data():
end = 0
for i in range(1, 6):
temp_list = get_page(i)
some = sum(temp_list)
end += some
print('end', end)
get_data()
结语
本次直接忽略ob混淆，硬抠webpack代码，一样有结果，难倒是不难，主要有点骚，他改了btoa函数和md5函数的逻辑，不是原生的
