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OAuth2の一般的なGrant Type

Authorization CodeやClient Credentialsなど、さまざまなGrant Typeと適切なユースケースを学びます。

「OAuth2の一般的なGrant Type」はCoddyKit上の無料Spring Security 6 & JWT Authenticationレッスンです。 これはレッスン3/4です。 下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。 これはSpring Security 6 & JWT Authentication学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Spring Security 6 & JWT Authenticationコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

What are OAuth2 Grant Types?

Welcome! In OAuth2, a Grant Type (or 'Authorization Grant') is a method an application uses to get an access token from an authorization server.

Think of it as the specific procedure or negotiation protocol for obtaining permission to access protected resources.

Why Different Grant Types?

You might wonder why there isn't just one way to get a token. Different applications have different security needs and capabilities:

  • Web applications with a backend
  • Single-page applications (SPAs) in a browser
  • Mobile applications
  • Command-line tools
  • Server-to-server communication

Each scenario requires a tailored, secure approach.

Authorization Code Grant

The Authorization Code Grant is the most common and recommended grant type for confidential clients, especially traditional web applications with a backend.

It's considered the most secure because the access token is never exposed directly in the user's browser.

Auth Code Flow: User Authorization

Here's how the Authorization Code flow typically starts:

  1. The user clicks 'Login with X' on your app.
  2. Your app redirects the user's browser to the Authorization Server (e.g., Google, GitHub).
  3. The user logs in and grants permission to your app.
  4. The Authorization Server then redirects the user's browser back to your app with a temporary authorization code.

Auth Code Flow: Token Exchange

After receiving the authorization code:

  1. Your app's backend receives the authorization code.
  2. It then securely exchanges this code (along with its own client ID and client secret) directly with the Authorization Server's token endpoint. This is a server-to-server communication.
  3. The Authorization Server validates the code and client credentials, then issues an access token (and often a refresh token).

Client Credentials Grant

The Client Credentials Grant is used for machine-to-machine communication where there is no end-user involved.

The client (your application or service) acts on its own behalf, authenticating itself directly to the Authorization Server to get an access token.

Client Credentials Flow

The flow for Client Credentials is simpler:

  1. Your client application (e.g., a background service) sends its client ID and client secret directly to the Authorization Server's token endpoint.
  2. The Authorization Server verifies these credentials.
  3. If valid, the Authorization Server directly issues an access token to your client.

No user interaction or browser redirects are needed.

Client Credentials in Action

Imagine a backend service that needs to query an external API to fetch data. It doesn't need a user to log in; it just needs access as 'itself'.

It would use the Client Credentials flow to get an access token:

curl -X POST -u "my-client-id:my-client-secret" \ "https://auth.example.com/oauth/token" \ -d "grant_type=client_credentials"

Device Code Grant

The Device Code Grant is designed for input-constrained devices like smart TVs, IoT devices, or command-line tools that cannot easily host a web browser or accept redirects.

It separates the authorization process, allowing the user to authorize the device on a separate, more capable device (like a smartphone or computer).

Device Code Flow

Here's a simplified Device Code flow:

  1. The device requests a device code and a user verification URI from the Authorization Server.
  2. The device displays the URI and a short code to the user.
  3. The user goes to the URI on their phone/PC, logs in, and enters the code to grant access.
  4. Meanwhile, the device repeatedly polls the Authorization Server until authorization is confirmed, then it receives the access token.

Grant Type Challenge

Based on what you've learned, which OAuth2 grant type is most suitable for a backend service that needs to access another API without any user interaction?

Recap: Grant Types in Focus

We've explored key OAuth2 grant types: Authorization Code for secure web applications with user interaction, Client Credentials for server-to-server communication, and Device Code for input-constrained devices.

Each grant type addresses specific security and usability needs, ensuring secure authorization flows for different application scenarios.

よくある質問

「OAuth2の一般的なGrant Type」レッスンは無料ですか？

はい。「OAuth2の一般的なGrant Type」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Spring Security 6 & JWT Authenticationコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Spring Security 6 & JWT Authenticationコースには全4レッスンが含まれています。

「OAuth2の一般的なGrant Type」で何を学びますか？

Authorization CodeやClient Credentialsなど、さまざまなGrant Typeと適切なユースケースを学びます。 ブラウザで直接実行するハンズオンコードでSpring Security 6 & JWT Authenticationを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

Spring Security 6 & JWT Authenticationを始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのSpring Security 6 & JWT Authenticationは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。 これはレッスン3/4です。

「OAuth2の一般的なGrant Type」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このSpring Security 6 & JWT Authenticationレッスンでコードを書いて実行できますか？

はい。すべてのSpring Security 6 & JWT Authenticationレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

このコースのすべてのレッスン

  1. OAuth2プロトコルの概要
  2. OpenID Connect入門
  3. OAuth2の一般的なGrant Type
  4. PKCEとパブリッククライアントの保護
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