mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-01 14:59:06 +00:00
18de83b2a3
## Changes
- Adds the following high level access scopes, each with `read` and
`write` levels:
- `activitypub`
- `admin` (hidden if user is not a site admin)
- `misc`
- `notification`
- `organization`
- `package`
- `issue`
- `repository`
- `user`
- Adds new middleware function `tokenRequiresScopes()` in addition to
`reqToken()`
- `tokenRequiresScopes()` is used for each high-level api section
- _if_ a scoped token is present, checks that the required scope is
included based on the section and HTTP method
- `reqToken()` is used for individual routes
- checks that required authentication is present (but does not check
scope levels as this will already have been handled by
`tokenRequiresScopes()`
- Adds migration to convert old scoped access tokens to the new set of
scopes
- Updates the user interface for scope selection
### User interface example
<img width="903" alt="Screen Shot 2023-05-31 at 1 56 55 PM"
src="https://github.com/go-gitea/gitea/assets/23248839/654766ec-2143-4f59-9037-3b51600e32f3">
<img width="917" alt="Screen Shot 2023-05-31 at 1 56 43 PM"
src="https://github.com/go-gitea/gitea/assets/23248839/1ad64081-012c-4a73-b393-66b30352654c">
## tokenRequiresScopes Design Decision
- `tokenRequiresScopes()` was added to more reliably cover api routes.
For an incoming request, this function uses the given scope category
(say `AccessTokenScopeCategoryOrganization`) and the HTTP method (say
`DELETE`) and verifies that any scoped tokens in use include
`delete:organization`.
- `reqToken()` is used to enforce auth for individual routes that
require it. If a scoped token is not present for a request,
`tokenRequiresScopes()` will not return an error
## TODO
- [x] Alphabetize scope categories
- [x] Change 'public repos only' to a radio button (private vs public).
Also expand this to organizations
- [X] Disable token creation if no scopes selected. Alternatively, show
warning
- [x] `reqToken()` is missing from many `POST/DELETE` routes in the api.
`tokenRequiresScopes()` only checks that a given token has the correct
scope, `reqToken()` must be used to check that a token (or some other
auth) is present.
- _This should be addressed in this PR_
- [x] The migration should be reviewed very carefully in order to
minimize access changes to existing user tokens.
- _This should be addressed in this PR_
- [x] Link to api to swagger documentation, clarify what
read/write/delete levels correspond to
- [x] Review cases where more than one scope is needed as this directly
deviates from the api definition.
- _This should be addressed in this PR_
- For example:
```go
m.Group("/users/{username}/orgs", func() {
m.Get("", reqToken(), org.ListUserOrgs)
m.Get("/{org}/permissions", reqToken(), org.GetUserOrgsPermissions)
}, tokenRequiresScopes(auth_model.AccessTokenScopeCategoryUser,
auth_model.AccessTokenScopeCategoryOrganization),
context_service.UserAssignmentAPI())
```
## Future improvements
- [ ] Add required scopes to swagger documentation
- [ ] Redesign `reqToken()` to be opt-out rather than opt-in
- [ ] Subdivide scopes like `repository`
- [ ] Once a token is created, if it has no scopes, we should display
text instead of an empty bullet point
- [ ] If the 'public repos only' option is selected, should read
categories be selected by default
Closes #24501
Closes #24799
Co-authored-by: Jonathan Tran <jon@allspice.io>
Co-authored-by: Kyle D <kdumontnu@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
206 lines
13 KiB
Markdown
206 lines
13 KiB
Markdown
---
|
|
date: "2023-06-01T08:40:00+08:00"
|
|
title: "OAuth2 provider"
|
|
slug: "oauth2-provider"
|
|
weight: 41
|
|
toc: false
|
|
draft: false
|
|
aliases:
|
|
- /en-us/oauth2-provider
|
|
menu:
|
|
sidebar:
|
|
parent: "development"
|
|
name: "OAuth2 Provider"
|
|
weight: 41
|
|
identifier: "oauth2-provider"
|
|
---
|
|
|
|
# OAuth2 provider
|
|
|
|
**Table of Contents**
|
|
|
|
{{< toc >}}
|
|
|
|
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.
|
|
|
|
## Endpoints
|
|
|
|
| Endpoint | URL |
|
|
| ------------------------ | ----------------------------------- |
|
|
| OpenID Connect Discovery | `/.well-known/openid-configuration` |
|
|
| Authorization Endpoint | `/login/oauth/authorize` |
|
|
| Access Token Endpoint | `/login/oauth/access_token` |
|
|
| OpenID Connect UserInfo | `/login/oauth/userinfo` |
|
|
| JSON Web Key Set | `/login/oauth/keys` |
|
|
|
|
## Supported OAuth2 Grants
|
|
|
|
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:
|
|
|
|
- [Proof Key for Code Exchange (PKCE)](https://tools.ietf.org/html/rfc7636)
|
|
- [OpenID Connect (OIDC)](https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth)
|
|
|
|
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. To test or debug you can use the web-tool https://oauthdebugger.com/.
|
|
|
|
## Scopes
|
|
|
|
Gitea supports scoped access tokens, which allow users the ability to restrict tokens to operate only on selected url routes. Scopes are grouped by high-level API routes, and further refined to the following:
|
|
|
|
- `read`: `GET` routes
|
|
- `write`: `POST`, `PUT`, `PATCH`, and `DELETE` routes (in addition to `GET`)
|
|
|
|
Gitea token scopes are as follows:
|
|
|
|
| Name | Description |
|
|
| ---- |--------------------------------------------------------------------------------------------------------------------------------------------------|
|
|
| **(no scope)** | Not supported. A scope is required even for public repositories. |
|
|
| **activitypub** | `activitypub` API routes: ActivityPub related operations. |
|
|
| **read:activitypub** | Grants read access for ActivityPub operations. |
|
|
| **write:activitypub** | Grants read/write/delete access for ActivityPub operations. |
|
|
| **admin** | `/admin/*` API routes: Site-wide administrative operations (hidden for non-admin accounts). |
|
|
| **read:admin** | Grants read access for admin operations, such as getting cron jobs or registered user emails. |
|
|
| **write:admin** | Grants read/write/delete access for admin operations, such as running cron jobs or updating user accounts. | |
|
|
| **issue** | `issues/*`, `labels/*`, `milestones/*` API routes: Issue-related operations. |
|
|
| **read:issue** | Grants read access for issues operations, such as getting issue comments, issue attachments, and milestones. |
|
|
| **write:issue** | Grants read/write/delete access for issues operations, such as posting or editing an issue comment or attachment, and updating milestones. |
|
|
| **misc** | miscellaneous and settings top-level API routes. |
|
|
| **read:misc** | Grants read access to miscellaneous operations, such as getting label and gitignore templates. |
|
|
| **write:misc** | Grants read/write/delete access to miscellaneous operations, such as markup utility operations. |
|
|
| **notification** | `notification/*` API routes: user notification operations. |
|
|
| **read:notification** | Grants read access to user notifications, such as which notifications users are subscribed to and read new notifications. |
|
|
| **write:notification** | Grants read/write/delete access to user notifications, such as marking notifications as read. |
|
|
| **organization** | `orgs/*` and `teams/*` API routes: Organization and team management operations. |
|
|
| **read:organization** | Grants read access to org and team status, such as listing all orgs a user has visibility to, teams, and team members. |
|
|
| **write:organization** | Grants read/write/delete access to org and team status, such as creating and updating teams and updating org settings. |
|
|
| **package** | `/packages/*` API routes: Packages operations |
|
|
| **read:package** | Grants read access to package operations, such as reading and downloading available packages. |
|
|
| **write:package** | Grants read/write/delete access to package operations. Currently the same as `read:package`. |
|
|
| **repository** | `/repos/*` API routes except `/repos/issues/*`: Repository file, pull-request, and release operations. |
|
|
| **read:repository** | Grants read access to repository operations, such as getting repository files, releases, collaborators. |
|
|
| **write:repository** | Grants read/write/delete access to repository operations, such as getting updating repository files, creating pull requests, updating collaborators. |
|
|
| **user** | `/user/*` and `/users/*` API routes: User-related operations. |
|
|
| **read:user** | Grants read access to user operations, such as getting user repo subscriptions and user settings. |
|
|
| **write:user** | Grants read/write/delete access to user operations, such as updating user repo subscriptions, followed users, and user settings. |
|
|
|
|
## Client types
|
|
|
|
Gitea supports both confidential and public client types, [as defined by RFC 6749](https://datatracker.ietf.org/doc/html/rfc6749#section-2.1).
|
|
|
|
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).
|
|
|
|
## Examples
|
|
|
|
### Confidential client
|
|
|
|
**Note:** This example does not use PKCE.
|
|
|
|
1. Redirect the user to the authorization endpoint in order to get their consent for accessing the resources:
|
|
|
|
```curl
|
|
https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI&response_type=code&state=STATE
|
|
```
|
|
|
|
The `CLIENT_ID` can be obtained by registering an application in the settings. The `STATE` is a random string that will be sent back to your application after the user authorizes. The `state` parameter is optional, but should be used to prevent CSRF attacks.
|
|
|
|
|
|
|
|
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:
|
|
|
|
```curl
|
|
https://[REDIRECT_URI]?code=RETURNED_CODE&state=STATE
|
|
```
|
|
|
|
2. Using the provided `code` from the redirect, you can request a new application and refresh token. The access token endpoint accepts POST requests with `application/json` and `application/x-www-form-urlencoded` body, for example:
|
|
|
|
```curl
|
|
POST https://[YOUR-GITEA-URL]/login/oauth/access_token
|
|
```
|
|
|
|
```json
|
|
{
|
|
"client_id": "YOUR_CLIENT_ID",
|
|
"client_secret": "YOUR_CLIENT_SECRET",
|
|
"code": "RETURNED_CODE",
|
|
"grant_type": "authorization_code",
|
|
"redirect_uri": "REDIRECT_URI"
|
|
}
|
|
```
|
|
|
|
Response:
|
|
|
|
```json
|
|
{
|
|
"access_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjowLCJleHAiOjE1NTUxNzk5MTIsImlhdCI6MTU1NTE3NjMxMn0.0-iFsAwBtxuckA0sNZ6QpBQmywVPz129u75vOM7wPJecw5wqGyBkmstfJHAjEOqrAf_V5Z-1QYeCh_Cz4RiKug",
|
|
"token_type": "bearer",
|
|
"expires_in": 3600,
|
|
"refresh_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjoxLCJjbnQiOjEsImV4cCI6MTU1NzgwNDMxMiwiaWF0IjoxNTU1MTc2MzEyfQ.S_HZQBy4q9r5SEzNGNIoFClT43HPNDbUdHH-GYNYYdkRfft6XptJBkUQscZsGxOW975Yk6RbgtGvq1nkEcklOw"
|
|
}
|
|
```
|
|
|
|
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.
|
|
|
|
The `REDIRECT_URI` in the `access_token` request must match the `REDIRECT_URI` in the `authorize` request.
|
|
|
|
3. Use the `access_token` to make [API requests](https://docs.gitea.io/en-us/api-usage#oauth2) to access the user's resources.
|
|
|
|
### Public client (PKCE)
|
|
|
|
PKCE (Proof Key for Code Exchange) is an extension to the OAuth flow which allows for a secure credential exchange without the requirement to provide a client secret.
|
|
|
|
**Note**: Please ensure you have registered your OAuth application as a public client.
|
|
|
|
To achieve this, you have to provide a `code_verifier` for every authorization request. A `code_verifier` has to be a random string with a minimum length of 43 characters and a maximum length of 128 characters. It can contain alphanumeric characters as well as the characters `-`, `.`, `_` and `~`.
|
|
|
|
Using this `code_verifier` string, a new one called `code_challenge` is created by using one of two methods:
|
|
|
|
- If you have the required functionality on your client, set `code_challenge` to be a URL-safe base64-encoded string of the SHA256 hash of `code_verifier`. In that case, your `code_challenge_method` becomes `S256`.
|
|
- If you are unable to do so, you can provide your `code_verifier` as a plain string to `code_challenge`. Then you have to set your `code_challenge_method` as `plain`.
|
|
|
|
After you have generated this values, you can continue with your request.
|
|
|
|
1. Redirect the user to the authorization endpoint in order to get their consent for accessing the resources:
|
|
|
|
```curl
|
|
https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI&response_type=code&code_challenge_method=CODE_CHALLENGE_METHOD&code_challenge=CODE_CHALLENGE&state=STATE
|
|
```
|
|
|
|
The `CLIENT_ID` can be obtained by registering an application in the settings. The `STATE` is a random string that will be sent back to your application after the user authorizes. The `state` parameter is optional, but should be used to prevent CSRF attacks.
|
|
|
|
|
|
|
|
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:
|
|
|
|
```curl
|
|
https://[REDIRECT_URI]?code=RETURNED_CODE&state=STATE
|
|
```
|
|
|
|
2. Using the provided `code` from the redirect, you can request a new application and refresh token. The access token endpoint accepts POST requests with `application/json` and `application/x-www-form-urlencoded` body, for example:
|
|
|
|
```curl
|
|
POST https://[YOUR-GITEA-URL]/login/oauth/access_token
|
|
```
|
|
|
|
```json
|
|
{
|
|
"client_id": "YOUR_CLIENT_ID",
|
|
"code": "RETURNED_CODE",
|
|
"grant_type": "authorization_code",
|
|
"redirect_uri": "REDIRECT_URI",
|
|
"code_verifier": "CODE_VERIFIER",
|
|
}
|
|
```
|
|
|
|
Response:
|
|
|
|
```json
|
|
{
|
|
"access_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjowLCJleHAiOjE1NTUxNzk5MTIsImlhdCI6MTU1NTE3NjMxMn0.0-iFsAwBtxuckA0sNZ6QpBQmywVPz129u75vOM7wPJecw5wqGyBkmstfJHAjEOqrAf_V5Z-1QYeCh_Cz4RiKug",
|
|
"token_type": "bearer",
|
|
"expires_in": 3600,
|
|
"refresh_token": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJnbnQiOjIsInR0IjoxLCJjbnQiOjEsImV4cCI6MTU1NzgwNDMxMiwiaWF0IjoxNTU1MTc2MzEyfQ.S_HZQBy4q9r5SEzNGNIoFClT43HPNDbUdHH-GYNYYdkRfft6XptJBkUQscZsGxOW975Yk6RbgtGvq1nkEcklOw"
|
|
}
|
|
```
|
|
|
|
The `REDIRECT_URI` in the `access_token` request must match the `REDIRECT_URI` in the `authorize` request.
|
|
|
|
3. Use the `access_token` to make [API requests](https://docs.gitea.io/en-us/api-usage#oauth2) to access the user's resources.
|