CSDN爬虫signature加密算法破解

dingallen216

考研二战，看书看完一章，突然想爬个网页玩玩，就来到csdn，爬爬论坛数据。在设计好爬取的结构后，我开始观察网页内容：


在每一个分类下，都有着一定数量的社区。通过分析，很容易知道进入这些社区的链接是通过js动态加载出来的，链接格式为：
https://bizapi.csdn.net/community-cloud/v1/homepage/community/by/tag?deviceType=PC&tagId=


看到这，我便直接发送了get请求，可看到的只有400的响应码。我注意到，响应头里有这么个玩意：
x-ca-error-message: Header `X-Ca-Key` is Required
于是我回到之前请求成功的报文处查看，果然：


通过一阵翻找，终于找到了我想到的信息，链接如下：
https://csdnimg.cn/release/cmsfe/public/js/chunk/tpl/ccloud-bbs/index.6485c913.js

之后观察代码花了蛮长时间的，其实做了很多无用功，这还是源于经验不足，总之后来我想到了两个解决路径，这里说简单的那个。通过调试，在一关键步骤中我们能得到这样一个字符串：

这样一个字符串是极易拼接的，得到这样一个字符串后，观察代码得知将此字符串通过hmac-sha256算法+Base64编码后就能得到签名。
上一段爬取x-ca-key和hmac-sha256密码的代码：

[Python] 纯文本查看 复制代码

def get_keys(html):[/size]
[size=3]    index_url = re.search('https://csdnimg\.cn/release/cmsfe/public/js/chunk/tpl/ccloud-bbs/index\..*\.js',[/size]
[size=3]                          html).group()[/size]
[size=3]    index_js = requests.get(index_url).text[/size]
[size=3]    appSecret = re.search('''appSecret:"([a-zA-Z0-9]*)"''', index_js).group(1)[/size]
[size=3]    key = re.search('''e.headers\["X-Ca-Key"\]=([0-9]*),''', index_js).group(1)[/size]

[size=3]    return appSecret, key

输入的参数就是进入到的csdn的主界面的html text。
其实也就是课余玩一玩，后面爬成啥样我也不知道，但至少自此csdn已门户大开。
晒一晒爬到的论坛url：

[Python] 纯文本查看 复制代码

https://bbs.csdn.net/forums/CSharp
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存在Bing

https://download.csdn.net/download/dbnjzy/21516054?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522166070779316781647538547%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=166070779316781647538547&biz_id=1&utm_medium=distribute.pc_search_result.none-task-download-2~all~first_rank_ecpm_v1~pc_rank_v36-7-21516054-null-null.142^v41^pc_rank_v36,185^v2^control&utm_term=%E5%8A%A8%E8%83%BD%E8%BD%AC%E7%94%B5%E8%83%BD&spm=1018.2226.3001.4187.7
能帮忙下载吗？

anjizhuzhu

涛之雨 发表于 2021-9-12 22:36
换一个图床吧。。。这个怎么感觉全都是缩略图。。。

版主大大，你好！
我这边有一个逆向抓包的需求，想跟你聊聊有没有合作的可能性，方便沟通一下吗，谢谢！

骑狗的猴子

厉害 厉害 CSDN 都可以爬取，不知道CSDN的下载好不好弄

user002

感谢分享

开创者

csdn学习卡的东西要是能搞就好 了，马上到期了

zhiliu98

CNDS下载的可以免费下载吗

koya

zhiliu98 发表于 2021-9-12 15:12
CNDS下载的可以免费下载吗

不能免费下载吧

zxxiaopi

大胸弟，搞个CSDN的下载把，忒坑了！

sam喵喵

厉害，希望拓展下可以下其他网站数据譬如cnblog

三目清

厉害୧(๑•̀◡•́๑)૭

涛之雨

换一个图床吧。。。这个怎么感觉全都是缩略图。。。