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-rw-r--r-- | doc/administration/auth/oidc.md | 105 |
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diff --git a/doc/administration/auth/oidc.md b/doc/administration/auth/oidc.md new file mode 100644 index 00000000000..e55f7dbb4df --- /dev/null +++ b/doc/administration/auth/oidc.md @@ -0,0 +1,105 @@ +# OpenID Connect OmniAuth provider + +GitLab can use [OpenID Connect](https://openid.net/specs/openid-connect-core-1_0.html) as an OmniAuth provider. + +To enable the OpenID Connect OmniAuth provider, you must register your application with an OpenID Connect provider. +The OpenID Connect will provide you with a client details and secret for you to use. + +1. On your GitLab server, open the configuration file. + + For Omnibus GitLab: + + ```sh + sudo editor /etc/gitlab/gitlab.rb + ``` + + For installations from source: + + ```sh + cd /home/git/gitlab + sudo -u git -H editor config/gitlab.yml + ``` + + See [Initial OmniAuth Configuration](../../integration/omniauth.md#initial-omniauth-configuration) for initial settings. + +1. Add the provider configuration. + + For Omnibus GitLab: + + ```ruby + gitlab_rails['omniauth_providers'] = [ + { 'name' => 'openid_connect', + 'label' => '<your_oidc_label>', + 'args' => { + 'scope' => ['openid','profile'], + 'response_type' => 'code', + 'issuer' => '<your_oidc_url>', + 'discovery' => true, + 'client_auth_method' => 'query', + 'uid_field' => '<uid_field>', + 'client_options' => { + 'identifier' => '<your_oidc_client_id>', + 'secret' => '<your_oidc_client_secret>', + 'redirect_uri' => '<your_gitlab_url>/users/auth/openid_connect/callback' + } + } + } + ] + ``` + + For installation from source: + + ```yaml + - { name: 'openid_connect', + label: '<your_oidc_label>', + args: { + scope: ['openid','profile'], + response_type: 'code', + issuer: '<your_oidc_url>', + discovery: true, + client_auth_method: 'query', + uid_field: '<uid_field>', + client_options: { + identifier: '<your_oidc_client_id>', + secret: '<your_oidc_client_secret>', + redirect_uri: '<your_gitlab_url>/users/auth/openid_connect/callback' + } + } + } + ``` + + > **Note:** + > + > - For more information on each configuration option refer to + the [OmniAuth OpenID Connect usage documentation](https://github.com/m0n9oose/omniauth_openid_connect#usage) and + the [OpenID Connect Core 1.0 specification](https://openid.net/specs/openid-connect-core-1_0.html). + +1. For the configuration above, change the values for the provider to match your OpenID Connect client setup. Use the following as a guide: + - `<your_oidc_label>` is the label that will be displayed on the login page. + - `<your_oidc_url>` (optional) is the URL that points to the OpenID Connect provider. For example, `https://example.com/auth/realms/your-realm`. + If this value is not provided, the URL is constructed from the `client_options` in the following format: `<client_options.scheme>://<client_options.host>:<client_options.port>`. + - If `discovery` is set to `true`, the OpenID Connect provider will try to auto discover the client options using `<your_oidc_url>/.well-known/openid-configuration`. Defaults to `false`. + - `<uid_field>` (optional) is the field name from the `user_info` details that will be used as `uid` value. For example, `preferred_username`. + If this value is not provided or the field with the configured value is missing from the `user_info` details, the `uid` will use the `sub` field. + - `client_options` are the OpenID Connect client-specific options. Specifically: + + - `identifier` is the client identifier as configured in the OpenID Connect service provider. + - `secret` is the client secret as configured in the OpenID Connect service provider. + - `redirect_uri` is the GitLab URL to redirect the user to after successful login. For example, `http://example.com/users/auth/openid_connect/callback`. + - `end_session_endpoint` (optional) is the URL to the endpoint that end the session (logout). Can be provided if auto-discovery disabled or unsuccessful. + + The following `client_options` are optional unless auto-discovery is disabled or unsuccessful: + + - `authorization_endpoint` is the URL to the endpoint that authorizes the end user. + - `token_endpoint` is the URL to the endpoint that provides Access Token. + - `userinfo_endpoint` is the URL to the endpoint that provides the user information. + - `jwks_uri` is the URL to the endpoint where the Token signer publishes its keys. + +1. Save the configuration file. +1. [Reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure) or [restart GitLab](../restart_gitlab.md#installations-from-source) + for the changes to take effect if you installed GitLab via Omnibus or from source respectively. + +On the sign in page, there should now be an OpenID Connect icon below the regular sign in form. +Click the icon to begin the authentication process. The OpenID Connect provider will ask the user to +sign in and authorize the GitLab application (if confirmation required by the client). If everything goes well, the user +will be redirected to GitLab and will be signed in. |