50 lines
2.8 KiB
Markdown
50 lines
2.8 KiB
Markdown
# GitLab as OpenID Connect identity provider
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This document is about using GitLab as an OpenID Connect identity provider
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to sign in to other services.
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## Introduction to OpenID Connect
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[OpenID Connect](https://openid.net/connect/) \(OIDC) is a simple identity layer on top of the
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OAuth 2.0 protocol. It allows clients to verify the identity of the end-user
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based on the authentication performed by GitLab, as well as to obtain
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basic profile information about the end-user in an interoperable and
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REST-like manner. OIDC performs many of the same tasks as OpenID 2.0,
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but does so in a way that is API-friendly, and usable by native and
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mobile applications.
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On the client side, you can use [OmniAuth::OpenIDConnect](https://github.com/jjbohn/omniauth-openid-connect/) for Rails
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applications, or any of the other available [client implementations](https://openid.net/developers/libraries/#connect).
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GitLab's implementation uses the [doorkeeper-openid_connect] gem, refer
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to its README for more details about which parts of the specifications
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are supported.
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## Enabling OpenID Connect for OAuth applications
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Refer to the [OAuth guide] for basic information on how to set up OAuth
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applications in GitLab. To enable OIDC for an application, all you have to do
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is select the `openid` scope in the application settings.
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## Shared information
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Currently the following user information is shared with clients:
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| Claim | Type | Description |
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|:-----------------|:----------|:------------|
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| `sub` | `string` | The ID of the user
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| `sub_legacy` | `string` | An opaque token that uniquely identifies the user<br><br>**Deprecation notice:** this token isn't stable because it's tied to the Rails secret key base, and is provided only for migration to the new stable `sub` value available from GitLab 11.1
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| `auth_time` | `integer` | The timestamp for the user's last authentication
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| `name` | `string` | The user's full name
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| `nickname` | `string` | The user's GitLab username
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| `email` | `string` | The user's public email address
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| `email_verified` | `boolean` | Whether the user's public email address was verified
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| `website` | `string` | URL for the user's website
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| `profile` | `string` | URL for the user's GitLab profile
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| `picture` | `string` | URL for the user's GitLab avatar
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| `groups` | `array` | Names of the groups the user is a member of
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Only the `sub` and `sub_legacy` claims are included in the ID token, all other claims are available from the `/oauth/userinfo` endpoint used by OIDC clients.
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[doorkeeper-openid_connect]: https://github.com/doorkeeper-gem/doorkeeper-openid_connect "Doorkeeper::OpenidConnect website"
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[OAuth guide]: oauth_provider.md "GitLab as OAuth2 authentication service provider"
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