如何使用具有正确 Headers 和 SHA512 哈希令牌的节点生成正确的 TOTP？

Question

我最近分配的一个学校项目有一个编码挑战，我们必须完成。挑战有多个部分，最后一部分是上传到私有 GitHub 存储库并通过在特定条件下发出 POST 请求来提交完成请求。

我已成功完成挑战的其他部分，但无法提交请求。提交必须遵循以下规则：

Build your solution request

First, construct a JSON string like below:

{

"github_url": "https://github.com/YOUR_ACCOUNT/GITHUB_REPOSITORY",

"contact_email": "YOUR_EMAIL"

}

Fill in your email address for YOUR_EMAIL, and the private Github repository with your solution in YOUR_ACCOUNT/GITHUB_REPOSITORY. Then, make an HTTP POST request to the following URL with the JSON string as the body part.

CHALLENGE_URL

Content type

The Content-Type: of the request must be application/json.

Authorization

The URL is protected by HTTP Basic Authentication, which is explained on Chapter 2 of RFC2617, so you have to provide an Authorization: header field in your POST request.

For the userid of HTTP Basic Authentication, use the same email address you put in the JSON string.

For the password , provide a 10-digit time-based one time password conforming to RFC6238 TOTP.

Authorization password

For generating the TOTP password, you will need to use the following setup:

You have to generate a correct TOTP password according to RFC6238

TOTP's Time Step X is 30 seconds. T0 is 0.

Use HMAC-SHA-512 for the hash function, instead of the default HMAC-SHA-1.

Token shared secret is the userid followed by ASCII string value "APICHALLENGE" (not including double quotations).

Shared secret examples

For example, if the userid is "email@example.com", the token shared secret is "email@example.comAPICHALLENGE" (without quotes).

If your POST request succeeds, the server returns HTTP status code 200 .

我已经尝试非常仔细地遵循这个大纲，并以不同的方式测试我的工作。但是，似乎我做对了。我们应该从 Node 服务器后端发出请求。这是我到目前为止所做的。我使用 npm init 创建了一个新的 npm 项目并安装了您将在下面的代码中看到的依赖项：

const axios = require('axios');
const base64 = require('base-64');
const utf8 = require('utf8');

const { totp } = require('otplib');


const reqJSON = 
{
    github_url: GITHUB_URL,
    contact_email: MY_EMAIL
}
const stringData = JSON.stringify(reqJSON);

const URL = CHALLENGE_URL;
const sharedSecret = reqJSON.contact_email + "APICHALLENGE";

totp.options = { digits: 10, algorithm: "sha512" }

const myTotp = totp.generate(sharedSecret);
const isValid = totp.check(myTotp, sharedSecret);

console.log("Token Info:", {myTotp, isValid});




const authStringUTF = reqJSON.contact_email + ":" + myTotp;
const bytes = utf8.encode(authStringUTF);
const encoded = base64.encode(bytes);



const createReq = async () =>
{

    try 
    {

        // set the headers
        const config = {
            headers: {
                'Content-Type': 'application/json',
                "Authorization": "Basic " + encoded
            }
        };

        console.log("Making req", {URL, reqJSON, config});

        const res = await axios.post(URL, stringData, config);
        console.log(res.data);
    }
    catch (err)
    {
        console.error(err.response.data);
    }
};

createReq();

据我了解，我不确定我在哪里犯了错误。在理解这些要求时，我已尽力做到非常小心。我已经简要查看了挑战概述的所有文档，并收集了在给定条件下正确生成 TOTP 所需的必要要求。

我发现 npm 包 otplib 可以通过我传入的选项满足这些要求。

但是，我的解决方案是不正确的。当我尝试提交解决方案时，收到错误消息 "Invalid token, wrong code"。有人可以帮我看看我做错了什么吗？

我真的不希望我所有的努力都白费，因为这是一个漫长的项目。

非常感谢您抽出宝贵时间来帮助解决这个问题。非常感谢。

Answer 1

软件包 otplib 的自述文件指出：

// TOTP defaults
{
  // ...includes all HOTP defaults
  createHmacKey: totpCreateHmacKey,
  epoch: Date.now(),
  step: 30,
  window: 0,
}

所以 epoch (T0) 的默认值是 Date.now()，这是 RFC 标准。任务描述定义 T0 是 0.

您需要将 epoch 的默认值更改为 0:

totp.options = { digits: 10, algorithm: "sha512", epoch: 0 }

如何使用具有正确 Headers 和 SHA512 哈希令牌的节点生成正确的 TOTP？

How do I generate the correct TOTP with Node with correct Headers and SHA512 hashed Token?

node.js

https

http-headers

hmac

totp