反爬(某企业信用信息) Js逆向分析过程

2020-09-11 Crawler Python 阅读量

请先关闭 ROBOTSTXT_OBEY

如果 ROBOTSTXT_OBEY 是打开的，下载器会先请求 http://www.gsxt.gov.cn/robots.txt, 第一次请求会被服务器携带 Set-Cookie

用 `scrapy shell` 启动

第一次请求

携带User-Agent 头:

1	scrapy shell -s USER_AGENT="Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0" 'http://www.gsxt.gov.cn/'

分析响应：

Header: Set-Cookie

1 2	>>> response.headers['Set-Cookie'] b'__jsluid_h=f088bf0fa4b4588e67d2978a7d0f294c; max-age=31536000; path=/; HttpOnly'

1	jsluid_h = response.headers['Set-Cookie'].decode('utf-8').split('=')[1].split(';')[0]

body

1 2	>>> view(response) True

<script>
    document.cookie=('_')+('_')+('j')+('s')+('l')+('_')+('c')+('l')+('e')+('a')+('r')+('a')+('n')+('c')+('e')+('=')+(-~{}+'')+(6+'')+(~~false+'')+((+false)+'')+(-~[2]+'')+((2^1)+'')+((1|2)+'')+(-~(4)+'')+(0+1+0+1+'')+(~~{}+'')+('.')+(6+'')+('|')+('-')+(-~[]+'')+('|')+('t')+('A')+('i')+('Q')+('L')+('L')+('f')+(1+6+'')+('k')+('d')+('c')+('f')+('Y')+('N')+('f')+('b')+('J')+('Z')+(9-1*2+'')+('f')+('R')+('Q')+('O')+('o')+('M')+('g')+('c')+('%')+((1+[2]>>2)+'')+('D')+(';')+('m')+('a')+('x')+('-')+('a')+('g')+('e')+('=')+((1|2)+'')+(';')+('p')+('a')+('t')+('h')+('=')+('/');
    location.href=location.pathname+location.search
</script>

解析：

import execjs

js_src = response.css('script::text').get()
js_func_body = js_src.replace('document.cookie', 'let cookie').replace('location.href=location.pathname+location.search', 'return cookie;')
js_func = 'function getCookie() {' + js_func_body + '}'
jscontext = execjs.compile(js_func)
cookie_str = jscontext.call("getCookie")
jsl_clearance = cookie_str.split('=')[1].split(';')[0]

整理：

import execjs

def getJsCookie1T(self, response):
    jsluid_h = response.headers['Set-Cookie'].decode('utf-8').split('=')[1].split(';')[0]
    js_src = response.css('script::text').get()
    js_func_body = js_src.replace('document.cookie', 'let cookie').replace('location.href=location.pathname+location.search', 'return cookie;')
    js_func = 'function getCookie() {' + js_func_body + '}'
    jscontext = execjs.compile(js_func)
    cookie_str = jscontext.call("getCookie")
    jsl_clearance = cookie_str.split('=')[1].split(';')[0]
    js_cookie = f"__jsluid_h={jsluid_h}; __jsl_clearance={jsl_clearance}"
    return js_cookie

第二次请求

携带User-Agent 和第一次生成的 Cookie:

>>> request = request.replace(headers={'User-Agent': request.headers['User-Agent'], 'Cookie': js_cookie})
>>> request
<GET http://www.gsxt.gov.cn/>
>>> fetch(request)
>>>

body

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逆向JS：

格式化JS代码
node 运行js文件
发现有 window document location alert等 node 环境没有的属性

使用 jsdom 解决第三步的问题

安装 npm i jsdom --save

修改 js 文件

前面添加如下代码：

const jsdom = require("jsdom");
const { JSDOM } = jsdom;
const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);
window = dom.window;
document = window.document;
location = window.location;
XMLHttpRequest = window.XMLHttpRequest;
alert = console.log;

替换location 相关代码：

location[_0x2a36("0x102", "G]I%")] =
      location[_0x2a36("0xee", "6dCB") + _0x2a36("0xbc", "fj6o")] +
      location[_0x2a36("0x5b", "!lad") + "ch"];
```  
  修改为：
```js
console.log(document['cookie']);

再次 node 运行js文件

1 2	> node t2.js __jsl_clearance=1600342774.885\|0\|OiVew7RX5sXpvy2sA7izwmZzPzM%3D

环境中运行:

>>> import re
>>> data = response.text
>>> js = re.findall('<script>(.*?)</script>', data)[0]

>>> js_added_head = "const jsdom = require('jsdom');const { JSDOM } = jsdom;const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);window = dom.window;document = window.document;location = window.location;XMLHttpRequest = window.XMLHttpRequest;alert = console.log;"
>>> js = js_added_head + js

找到 location 赋值的正则表达式：

1	location\[.+\]=[^;]+;

1 2	>>> re.findall('location\[.+\]=[^;]+;', js)[0] "location[_0x2a36('0x102','G]I%')]=location[_0x2a36('0xee','6dCB')+_0x2a36('0xbc','fj6o')]+location[_0x2a36('0x5b','!lad')+'ch'];"

替换：

1	js = re.sub(r'location\[.+\]=[^;]+;', "console.log(document['cookie']);", js)

运行js:

需要npm环境，安装jsdom

node_modules 路径:

/Users/admin/workspace/exercises/python/scrapy/tutorial/js-reverse/node_modules

代码：

>>> import execjs

>>> ct = execjs.compile(js, cwd=r'/Users/admin/workspace/exercises/python/scrapy/tutorial/js-reverse/node_modules')

>>> execjs.eval(js, cwd=r'/Users/admin/workspace/exercises/python/scrapy/tutorial/js-reverse/node_modules')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    execjs.eval(js, cwd=r'/Users/admin/workspace/exercises/python/scrapy/tutorial/js-reverse/node_modules')
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/__init__.py", line 51, in eval
    return get().eval(source, cwd)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_abstract_runtime.py", line 25, in eval
    return self.compile('', cwd=cwd).eval(source)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_abstract_runtime_context.py", line 27, in eval
    return self._eval(source)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_external_runtime.py", line 78, in _eval
    return self.exec_(code)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_abstract_runtime_context.py", line 18, in exec_
    return self._exec_(source)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_external_runtime.py", line 88, in _exec_
    return self._extract_result(output)
  File "/Users/admin/.virtualenvs/scrapy/lib/python3.7/site-packages/execjs/_external_runtime.py", line 167, in _extract_result
    raise ProgramError(value)
execjs._exceptions.ProgramError: SyntaxError: Unexpected token 'const'

遇见语法错误问题

使用 node 试试:

1
2
3

>>> with open(r'js-reverse/temp1.js', 'w+', encoding='utf-8') as f:
...     f.write(js)
...

1 2	node temp1.js __jsl_clearance=1600342774.885\|0\|OiVew7RX5sXpvy2sA7izwmZzPzM%3D

但 node 运行正常

修改 js_added_head

js_added_head = "const document = { cookie: {} };const location = {};const navigator = {userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0'};const window = { document, location, navigator };const alert = console.log;"

使用 execjs 执行还是不行， node 运行正常

使用 python 执行shell命令：

import subprocess

>>> ret=subprocess.getstatusoutput("node js-reverse/temp1.js")
>>> ret
(0, '__jsl_clearance=1600342774.885|0|OiVew7RX5sXpvy2sA7izwmZzPzM%3D;Max-age=3600; path = /')
>>> ret[1]
'__jsl_clearance=1600342774.885|0|OiVew7RX5sXpvy2sA7izwmZzPzM%3D;Max-age=3600; path = /'
>>> jsl_clearance=ret[1].split(";")[0].split("=")[1]

整理：

def getJsCookie2T(self, response):
    data = response.text
    js = re.findall('<script>(.*?)</script>', data)[0]
    js_added_head = "const document = { cookie: {} };const location = {};const navigator = {userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0'};const window = { document, location, navigator };const alert = console.log;"
    js = js_added_head + js
    js = re.sub(r'location\[.+\]=[^;]+;', "console.log(document['cookie']);", js)
    with open(r'js-reverse/temp1.js', 'w+', encoding='utf-8') as f:
        f.write(js)
    ret=subprocess.getstatusoutput("node js-reverse/temp1.js")
    jsl_clearance=ret[1].split(";")[0].split("=")[1]
    return jsl_clearance

用 scrapy shell 启动

第一次请求

第二次请求

用 `scrapy shell` 启动