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Signed-off-by: Xinyu Zhou <i@sourcehut.net>
104 lines
4.5 KiB
Markdown
104 lines
4.5 KiB
Markdown
---
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date: "2019-04-19:44:00+01:00"
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title: "OAuth2 provider"
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slug: "oauth2-provider"
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weight: 41
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toc: false
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draft: false
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menu:
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sidebar:
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parent: "developers"
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name: "OAuth2 Provider"
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weight: 41
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identifier: "oauth2-provider"
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---
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# OAuth2 provider
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**Table of Contents**
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{{< toc >}}
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Gitea supports acting as an OAuth2 provider to allow third party applications to access its resources with the user's consent. This feature is available since release 1.8.0.
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## Endpoints
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| Endpoint | URL |
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| ------------------------ | ----------------------------------- |
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| OpenID Connect Discovery | `/.well-known/openid-configuration` |
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| Authorization Endpoint | `/login/oauth/authorize` |
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| Access Token Endpoint | `/login/oauth/access_token` |
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| OpenID Connect UserInfo | `/login/oauth/userinfo` |
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| JSON Web Key Set | `/login/oauth/keys` |
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## Supported OAuth2 Grants
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At the moment Gitea only supports the [**Authorization Code Grant**](https://tools.ietf.org/html/rfc6749#section-1.3.1) standard with additional support of the following extensions:
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- [Proof Key for Code Exchange (PKCE)](https://tools.ietf.org/html/rfc7636)
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- [OpenID Connect (OIDC)](https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth)
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To use the Authorization Code Grant as a third party application it is required to register a new application via the "Settings" (`/user/settings/applications`) section of the settings.
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## Scopes
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Currently Gitea does not support scopes (see [#4300](https://github.com/go-gitea/gitea/issues/4300)) and all third party applications will be granted access to all resources of the user and their organizations.
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## Client types
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Gitea supports both confidential and public client types, [as defined by RFC 6749](https://datatracker.ietf.org/doc/html/rfc6749#section-2.1).
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For public clients, a redirect URI of a loopback IP address such as `http://127.0.0.1/` allows any port. Avoid using `localhost`, [as recommended by RFC 8252](https://datatracker.ietf.org/doc/html/rfc8252#section-8.3).
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## Example
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**Note:** This example does not use PKCE.
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1. Redirect to user to the authorization endpoint in order to get their consent for accessing the resources:
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```curl
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https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI& response_type=code&state=STATE
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```
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The `CLIENT_ID` can be obtained by registering an application in the settings. The `STATE` is a random string that will be send back to your application after the user authorizes. The `state` parameter is optional but should be used to prevent CSRF attacks.
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The user will now be asked to authorize your application. If they authorize it, the user will be redirected to the `REDIRECT_URL`, for example:
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```curl
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https://[REDIRECT_URI]?code=RETURNED_CODE&state=STATE
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```
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2. Using the provided `code` from the redirect, you can request a new application and refresh token. The access token endpoints accepts POST requests with `application/json` and `application/x-www-form-urlencoded` body, for example:
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```curl
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POST https://[YOUR-GITEA-URL]/login/oauth/access_token
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```
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```json
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{
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"client_id": "YOUR_CLIENT_ID",
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"client_secret": "YOUR_CLIENT_SECRET",
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"code": "RETURNED_CODE",
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"grant_type": "authorization_code",
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"redirect_uri": "REDIRECT_URI"
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}
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```
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Response:
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```json
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{
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"access_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjowLCJleHAiOjE1NTUxNzk5MTIsImlhdCI6MTU1NTE3NjMxMn0.0-iFsAwBtxuckA0sNZ6QpBQmywVPz129u75vOM7wPJecw5wqGyBkmstfJHAjEOqrAf_V5Z-1QYeCh_Cz4RiKug",
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"token_type": "bearer",
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"expires_in": 3600,
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"refresh_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjoxLCJjbnQiOjEsImV4cCI6MTU1NzgwNDMxMiwiaWF0IjoxNTU1MTc2MzEyfQ.S_HZQBy4q9r5SEzNGNIoFClT43HPNDbUdHH-GYNYYdkRfft6XptJBkUQscZsGxOW975Yk6RbgtGvq1nkEcklOw"
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}
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```
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The `CLIENT_SECRET` is the unique secret code generated for this application. Please note that the secret will only be visible after you created/registered the application with Gitea and cannot be recovered. If you lose the secret you must regenerate the secret via the application's settings.
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The `REDIRECT_URI` in the `access_token` request must match the `REDIRECT_URI` in the `authorize` request.
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3. Use the `access_token` to make [API requests](https://docs.gitea.io/en-us/api-usage#oauth2) to access the user's resources.
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