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---
stage: Manage
group: Access
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# GitLab as OAuth2 authentication service provider
This document describes how you can use GitLab as an OAuth 2
authentication service provider.
If you want to use:
- The [OAuth2](https://oauth.net/2/) protocol to access GitLab resources on user's behalf,
see [OAuth2 provider](../api/oauth2.md).
- Other OAuth 2 authentication service providers to sign in to
GitLab, see the [OAuth2 client documentation](omniauth.md).
- The related API, see [Applications API](../api/applications.md).
## Introduction to OAuth
[OAuth 2](https://oauth.net/2/) provides to client applications a 'secure delegated
access' to server resources on behalf of a resource owner. OAuth 2 allows
authorization servers to issue access tokens to third-party clients with the approval
of the resource owner or the end-user.
OAuth 2 can be used:
- To allow users to sign in to your application with their GitLab.com account.
- To set up GitLab.com for authentication to your GitLab instance.
(see [GitLab OmniAuth](gitlab.md)).
The 'GitLab Importer' feature also uses OAuth 2 to give access
to repositories without sharing user credentials to your GitLab.com account.
GitLab supports two ways of adding a new OAuth 2 application to an instance:
- As a regular user, for applications owned by an individual.
- Through the Admin Area menu for instance-wide apps.
The only difference between these two methods is the [permission](../user/permissions.md)
levels. The default callback URL is `http://your-gitlab.example.com/users/auth/gitlab/callback`.
## Add an application through the profile
To add a new application via your profile, select your avatar in the top right, and then select
**Settings > Applications**. You can then enter a **Name**, **Redirect URI** and
OAuth 2 scopes as defined in [Authorized Applications](#authorized-applications).
- The **Redirect URI** is the URL where users are sent after they authorize with GitLab.
When you select **Save application**, GitLab displays:
- Application ID: OAuth 2 Client ID.
- Secret: OAuth 2 Client Secret.
## OAuth applications in the Admin Area
To create an application for your GitLab instance, select
**Admin Area > Applications > New application**.
When creating an **Admin Area** application, you can mark it as _trusted_.
The user authorization step is automatically skipped for this application.
## Authorized applications
Every application you authorize with your GitLab credentials is shown
in the **Authorized applications** section under **Settings > Applications**.
The GitLab OAuth 2 applications support scopes, which allow various actions that any given
application can perform. Available scopes are depicted in the following table.
| Scope | Description |
| ------------------ | ----------- |
| `api` | Grants complete read/write access to the API, including all groups and projects, the container registry, and the package registry. |
| `read_user` | Grants read-only access to the authenticated user's profile through the /user API endpoint, which includes username, public email, and full name. Also grants access to read-only API endpoints under /users. |
| `read_api` | Grants read access to the API, including all groups and projects, the container registry, and the package registry. |
| `read_repository` | Grants read-only access to repositories on private projects using Git-over-HTTP or the Repository Files API. |
| `write_repository` | Grants read-write access to repositories on private projects using Git-over-HTTP (not using the API). |
| `read_registry` | Grants read-only access to container registry images on private projects. |
| `write_registry` | Grants read-only access to container registry images on private projects. |
| `sudo` | Grants permission to perform API actions as any user in the system, when authenticated as an administrator user. |
| `openid` | Grants permission to authenticate with GitLab using [OpenID Connect](openid_connect_provider.md). Also gives read-only access to the user's profile and group memberships. |
| `profile` | Grants read-only access to the user's profile data using [OpenID Connect](openid_connect_provider.md). |
| `email` | Grants read-only access to the user's primary email address using [OpenID Connect](openid_connect_provider.md). |
At any time you can revoke any access by clicking **Revoke**.
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