80 lines
2.9 KiB
Markdown
80 lines
2.9 KiB
Markdown
# GitLab as OAuth2 authentication service provider
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This document is about using GitLab as an OAuth authentication service provider
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to sign in to other services.
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If you want to use other OAuth authentication service providers to sign in to
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GitLab, please see the [OAuth2 client documentation](../api/oauth2.md).
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## Introduction to OAuth
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[OAuth] provides to client applications a 'secure delegated access' to server
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resources on behalf of a resource owner. In fact, OAuth allows an authorization
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server to issue access tokens to third-party clients with the approval of the
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resource owner, or the end-user.
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OAuth is mostly used as a Single Sign-On service (SSO), but you can find a
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lot of different uses for this functionality. For example, you can allow users
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to sign in to your application with their GitLab.com account, or GitLab.com
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can be used for authentication to your GitLab instance
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(see [GitLab OmniAuth](gitlab.md)).
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The 'GitLab Importer' feature is also using the OAuth protocol to give access
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to repositories without sharing user credentials to your GitLab.com account.
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---
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GitLab supports two ways of adding a new OAuth2 application to an instance. You
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can either add an application as a regular user or add it in the admin area.
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What this means is that GitLab can actually have instance-wide and a user-wide
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applications. There is no difference between them except for the different
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permission levels they are set (user/admin).
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## Adding an application through the profile
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In order to add a new application via your profile, navigate to
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**Profile Settings > Applications** and select **New Application**.
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---
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In the application form, enter a **Name** (arbitrary), and make sure to set up
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correctly the **Redirect URI** which is the URL where users will be sent after
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they authorize with GitLab.
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---
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When you hit **Submit** you will be provided with the application ID and
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the application secret which you can then use with your application that
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connects to GitLab.
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---
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## OAuth applications in the admin area
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To create an application that does not belong to a certain user, you can create
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it from the admin area.
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---
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## Authorized applications
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Every application you authorized to use your GitLab credentials will be shown
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in the **Authorized applications** section under **Profile Settings > Applications**.
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---
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As you can see, the default scope `api` is used, which is the only scope that
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GitLab supports so far. At any time you can revoke any access by just clicking
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**Revoke**.
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[oauth]: http://oauth.net/2/ "OAuth website"
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