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js逆向的题目

由admin

11 月 28, 2021

###

首先是第7题和第10题，

第七题，

使用抓包工具，重放攻击，

步骤，

1，找到包含数据的url，

2，对这个url，进行重放攻击，发现403，

3，检查cookie，两次并没有什么变化，怀疑是这个请求是依赖另一个请求的

4，找到上一个请求cityjson，先请求这个然后再请求我们的数据接口，就成功了

上python代码：

import requests
import urllib3

urllib3.disable_warnings()

url1 = "https://www.python-spider.com/cityjson"
url2 = "https://www.python-spider.com/api/challenge7"


cookies = "vaptchaNetway=cn; Hm_lvt_337e99a01a907a08d00bed4a1a52e35d=1628248083,1629106799; " 
          "sessionid=g1siko0evn5hmnn3pbgl0vaoqjx29cfo; Hm_lpvt_337e99a01a907a08d00bed4a1a52e35d=1629124377"

cookies_dict = {cookie.split("=")[0].strip(): cookie.split("=")[1].strip() for cookie in cookies.split(";")}

all_page_sum = []

for i in range(1,101):
    print("page: ", i)
    data = {"page": i}
    res = requests.get(url1, verify=False, cookies=cookies_dict)  # 先请求这个url，然后请求下面的url就通了，
    res2 = requests.post(url2, verify=False, cookies=cookies_dict, data=data)

    # print(res2.text)
    page_sum = sum([int(item["value"])for item in res2.json()["data"]])
    print([int(item["value"])for item in res2.json()["data"]])
    all_page_sum.append(page_sum)

print("all_page_sum =", sum(all_page_sum))

第十题：

使用抓包工具，重放攻击，

步骤，

1，找到包含数据的url，

2，对这个url，进行重放攻击，发现直接可以拿到数据，说明这个是独立的，我们就可以去用python发起请求了，

3，使用python发起请求，发现是失败的，

4，对比Charles重放攻击发起的请求和python代码发起的请求，发现cookie的顺序不一致，

5，把python代码的cookie顺序，调整为和重放攻击一直的cookie顺序，发送请求，成功，

上python代码：

import requests
import urllib3

urllib3.disable_warnings()

url1 = "https://www.python-spider.com/api/challenge10"

cookies = "vaptchaNetway=cn; Hm_lvt_337e99a01a907a08d00bed4a1a52e35d=1628248083,1629106799; " 
          "sessionid=g1siko0evn5hmnn3pbgl0vaoqjx29cfo; Hm_lpvt_337e99a01a907a08d00bed4a1a52e35d=1629124377"

headers = {
    "Host": "www.python-spider.com",
    "Connection": "keep-alive",
    "Content-Length": "0",
    "Origin": "https://www.python-spider.com",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36",
    "Accept": "*/*",
    "Referer": "https://www.python-spider.com/challenge/10",
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "zh-CN,zh;q=0.9",
}

cookies_dict = {cookie.split("=")[0].strip(): cookie.split("=")[1].strip() for cookie in cookies.split(";")}

all_page_sum = []

for i in range(1, 101):
    print("page: ", i)
    data = {"page": i}
    session = requests.session()
    session.headers = headers  # 关键是这一步，让headers有顺序的请求，
    res2 = session.post(url1, verify=False, cookies=cookies_dict, data=data)

    page_sum = sum([int(item["value"])for item in res2.json()["data"]])
    print([int(item["value"])for item in res2.json()["data"]])
    all_page_sum.append(page_sum)

print("all_page_sum =", sum(all_page_sum))

####

第一题和第二题， 

第一题，找到数据接口，第一页的接口重放攻击是正常的，但是第二页以后的接口重放攻击就是异常的了，

查看正常的和异常的两次请求，正常的请求头里面有一个safe参数，而且每次请求都是变化的，

既然每次都变化，怀疑是和随机数和时间有关，判断是js加密了这个safe参数放到了请求头，然后传递到后端，然后后端校验了这个字段，

所以要找到js是如何加密这个safe的，

var a = ‘9622’;
var timestamp = String(Date.parse(new Date()) / 1000);
var tokens = hex_md5(window.btoa(a + timestamp));
request.setRequestHeader(“safe”, tokens);
request.setRequestHeader(“timestamp”, timestamp)

所以这个safe的逻辑就是：时间/1000，然后+9622，然后window.btoa，然后md5加密，

注意1，时间是可以在请求头里面找到的，这个不要自己傻傻的写ew Date()

注意2，window.btoa，这个对应的就是python里面的base64加密

注意3，md5加密，对应的就是python里面的md5加密，

注意4，md5加密是可能网站对这个库进行改动的，如何判断是用的原生的md5，还是改动的，就是使用debug把加密之前的拿到，然后你自己md5加密看看，和他的是不是一样就知道了

上python代码

import requests
import urllib3
import base64
import hashlib
import time
import re
import json

urllib3.disable_warnings()

url = "https://www.python-spider.com/cityjson"

cookies = "vaptchaNetway=cn; Hm_lvt_337e99a01a907a08d00bed4a1a52e35d=1628248083,1629106799;" 
          " sessionid=a7ckvdtsz5p6i1udfggnkn5tk6je3dgr; _i=MTYyOTI2NDQ3M35ZV2xrYVc1blgzZHBiakUyTWpreU5qUTBOek16TXpR" 
          "PXw1MmRkNzJhMDk4NDNkNGRmNz$wNDM1Zj$xYjhiOTBlYQ; " 
          "_v=TVRZeU9USTJORFEzTTM1WlYyeHJZVmMxYmxnelpIQmlha1V5VFdwcmVVNX" 
          "FVVEJPZWsxNlRYcFJQWHcxTW1Sa056SmhNRGs0TkROa05HUm1OeiR3TkRNMVpqJHhZamhpT1R$bFlR; " 
          "sign=1629264618748~ca1c4ad08c0e246bfc23632a09b1ef64; Hm_lpvt_337e99a01a907a08d00bed4a1a52e35d=1629264744"

cookies_dict = {cookie.split("=")[0].strip(): cookie.split("=")[1].strip() for cookie in cookies.split(";")}

count_sum = 0

for i in range(1, 86):

    res = requests.get(url, verify=False, cookies=cookies_dict)
    # s = 'var returnCitySN = {"cip": "123.112.20.12", "timestamp": "1629274784"};'
    print(res.text)
    timestamp = re.findall('"(d{10})"', res.text)[0]
    # print(timestamp)

    safe_s = "9622" + timestamp
    safe_b64 = base64.b64encode(safe_s.encode())
    safe_md5 = hashlib.md5(safe_b64).hexdigest()

    print(safe_md5)
#
    headers = {
        "Host": "www.python-spider.com",
        "Connection": "keep-alive",
        "Content-Length": "0",
        "timestamp": timestamp,
        "safe": safe_md5,
        "Origin": "https://www.python-spider.com",
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36",
        "Accept": "*/*",
        "Referer": "https://www.python-spider.com/challenge/1",
        "Accept-Encoding": "gzip, deflate",
        "Accept-Language": "zh-CN,zh;q=0.9",
    }
#
    url2 = "https://www.python-spider.com/challenge/api/json?page={}&count=14".format(i)
    print(url2)
    res2 = requests.get(url2, verify=False, headers=headers, cookies=cookies_dict)
    # res2 = res2.content.decode("utf-8")
    # res2 = json.loads(res2)
    # print(res2)
    # print(type(res2))

    print(res2.json()["infos"])

    for item in res2.json()["infos"]:
        if "招" in item["message"]:
            print(item["message"])
            count_sum += 1

print("count_sum =",count_sum)

 第二题

既然是要找到cookie里面的sign加密字符串，

第一步，hook，cookie看看这个cookie的程序入口在哪里

这个断点调试，太厉害了，

怎么写这个hook，cookie，

document.cookie_bak = document.cookie

Object.defineProperty(document,”cookie”,

{set:function(value){

debugger;

return value}

})

这个时候返回document，说明是hook成功了，

然后调试，往上找堆栈，看哪里调用的，

这个方法有一个问题，就是只能hook运行一次，否则就要报错，你可以重新刷新页面，再执行，

第二步，扣代码

注意1，缺什么，补什么，深度优先，

注意2，使用pycharm调试，需要安装nodejs插件，

注意3，window在nodejs里面是不存在的，所以要使用window = this;的写法

注意4，window.btoa = require(“btoa”);

第三步，制作一个函数，python调用，

先安装一个包，pip install  PyExecjs -i http://pypi.douban.com/simple/ –trusted-host pypi.douban.com

上python代码：

import requests
import urllib3
import execjs

urllib3.disable_warnings()

url = "http://www.python-spider.com/challenge/2"

with open("./2.js", "r") as f:
    js_text = f.read()
    # print(js_text)
    js = execjs.compile(js_text)
    cookie = js.call("SDK_2").split(";")[0].replace("sign=","")

    print(cookie)

cookies = {
    "sessionid": "xm64ecbvpwv036ycfnw07vg6oyqpluxi",
    "sign": cookie,
}

session = requests.session()
res = session.get(url, verify=False, cookies=cookies)

print(res.content.decode())

###

练习第14题，

发现在请求参数里面加了一个uc，

var list = {
“page”: String(num),
“uc”: window.a,
};

这个

window.a是加密在了jsfuck里面了，

我们破解了之后是这样的，

(function anonymous(
) {
window.s = window.a(window.t + ‘|’ + window.num);window.a = window.s;
})

直接上python代码：

import requests
import urllib3
import execjs

urllib3.disable_warnings()

js_text = """


function SDK_14(n){
window = this;
num = n
// import CryptoJS from "crypto-js";
var CryptoJS = require("crypto-js");

window.num = num;
window.k = 'wdf2ff*TG@*(F4)*YH)g430HWR(*)' + 'wse';
window.t = Date.parse(new Date())/1000;
window.m = CryptoJS.enc.Utf8.parse(window.k);
window.a = function(word){
        var srcs = CryptoJS.enc.Utf8.parse(word);
        var encrypted = CryptoJS.AES.encrypt(srcs, window.m, {
            mode: CryptoJS.mode.ECB,
            padding: CryptoJS.pad.Pkcs7
        });
        return encrypted.toString();
        };

window.s = window.a(window.t + '|' + window.num);

window.a = window.s;
//
//     (function anonymous(
// ) {
// window.s = window.a(window.t + '|' + window.num);window.a = window.s;
// })

// console.log(window.a)

return window.a  
}

"""

url = "https://www.python-spider.com/api/challenge14"




cookies = "vaptchaNetway=cn; Hm_lvt_337e99a01a907a08d00bed4a1a52e35d=1628248083,1629106799;" 
          " sessionid=a7ckvdtsz5p6i1udfggnkn5tk6je3dgr; _i=MTYyOTI2NDQ3M35ZV2xrYVc1blgzZHBiakUyTWpreU5qUTBOek16TXpR" 
          "PXw1MmRkNzJhMDk4NDNkNGRmNz$wNDM1Zj$xYjhiOTBlYQ; " 
          "_v=TVRZeU9USTJORFEzTTM1WlYyeHJZVmMxYmxnelpIQmlha1V5VFdwcmVVNX" 
          "FVVEJPZWsxNlRYcFJQWHcxTW1Sa056SmhNRGs0TkROa05HUm1OeiR3TkRNMVpqJHhZamhpT1R$bFlR; " 
          "sign=1629264618748~ca1c4ad08c0e246bfc23632a09b1ef64; Hm_lpvt_337e99a01a907a08d00bed4a1a52e35d=1629264744"

cookies_dict = {cookie.split("=")[0].strip(): cookie.split("=")[1].strip() for cookie in cookies.split(";")}


all_sum = []
import time

for i in range(1, 101):
    # time.sleep(1)
    print("page = ",i)
    js = execjs.compile(js_text)
    uc = js.call("SDK_14", i)
    # print(uc)

    data = {
        "page": i,
        "uc": uc
    }
    res = requests.post(url, verify=False, data=data,cookies=cookies_dict)

    print(res.text)

    page_sum = sum([int(item_dict["value"]) for item_dict in res.json()["data"]])

    all_sum.append(page_sum)

print("all_sum =",sum(all_sum))

###

第16题，使用了表情包加密，

先破解表情包加密

window.localStorage.setItem(‘a’ , String(Date.parse(new Date()) / 1000));
a = window.localStorage.getItem(‘a’);
window.localStorage.setItem(‘token’, window.btoa(a)+(‘|’)+binb2b64(hex_sha1(window.btoa(core_sha1(a)))) + b64_sha1(a));
token = window.localStorage.getItem(‘token’);

然后扣代码

注意格式化校验的问题，

python代码

import requests
import urllib3
import execjs

urllib3.disable_warnings()


url = "https://www.python-spider.com/api/challenge16"

cookies = "vaptchaNetway=cn; Hm_lvt_337e99a01a907a08d00bed4a1a52e35d=1628248083,1629106799;" 
          " sessionid=a7ckvdtsz5p6i1udfggnkn5tk6je3dgr; _i=MTYyOTI2NDQ3M35ZV2xrYVc1blgzZHBiakUyTWpreU5qUTBOek16TXpR" 
          "PXw1MmRkNzJhMDk4NDNkNGRmNz$wNDM1Zj$xYjhiOTBlYQ; " 
          "_v=TVRZeU9USTJORFEzTTM1WlYyeHJZVmMxYmxnelpIQmlha1V5VFdwcmVVNX" 
          "FVVEJPZWsxNlRYcFJQWHcxTW1Sa056SmhNRGs0TkROa05HUm1OeiR3TkRNMVpqJHhZamhpT1R$bFlR; " 
          "sign=1629264618748~ca1c4ad08c0e246bfc23632a09b1ef64; Hm_lpvt_337e99a01a907a08d00bed4a1a52e35d=1629264744"

cookies = {cookie.split("=")[0].strip(): cookie.split("=")[1].strip() for cookie in cookies.split(";")}

all_sum = []

for i in range(1,101):
    print("page = ",i)
    with open("./16.js","r") as f:
        js_text = f.read()
        # print(js_text)
        js = execjs.compile(js_text)
        js_safe = js.call("SDK_16")
        # print(js_safe)

    headers = {
            "Host": "www.python-spider.com",
            "Connection": "keep-alive",
            "Content-Length": "6",
            "safe": js_safe,
            "Origin": "https://www.python-spider.com",
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36",
            "Accept": "*/*",
            "Referer": "https://www.python-spider.com/challenge/16",
            "Accept-Encoding": "gzip, deflate",
            "Accept-Language": "zh-CN,zh;q=0.9",
            "x-requested-with": "XMLHttpRequest",
    }
    data = {
        "page": i
    }
    res = requests.post(url, verify=False, headers = headers,data=data, cookies=cookies)

    print(res.text)
    page_sum = sum([int(item_dict["value"]) for item_dict in res.json()["data"]])
    # print(page_sum)

    all_sum.append(page_sum)

print("all_sum =",sum(all_sum))

####

###

admin

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