GitLab

This auth provider has been tested against Gitlab version 12.X. Due to Gitlab API changes, it may not work for version prior to 12.X (see 994).

Whether you are using GitLab.com or self-hosting GitLab, follow these steps to add an application. Make sure to enable at least the openid, profile and email scopes, and set the redirect url to your application url e.g. https://myapp.com/oauth2/callback.

If you need projects filtering, add the extra read_api scope to your application.

The following config should be set to ensure that the oauth will work properly. To get a cookie secret follow these steps

    --provider="gitlab"
    --redirect-url="https://myapp.com/oauth2/callback" // Should be the same as the redirect url for the application in gitlab
    --client-id=GITLAB_CLIENT_ID
    --client-secret=GITLAB_CLIENT_SECRET
    --cookie-secret=COOKIE_SECRET

Restricting by group membership is possible with the following option:

    --gitlab-group="mygroup,myothergroup"  # restrict logins to members of any of these groups (slug), separated by a comma

If you are using self-hosted GitLab, make sure you set the following to the appropriate URL:

    --oidc-issuer-url="<your gitlab url>"

If your self-hosted GitLab is on a subdirectory (e.g. domain.tld/gitlab), as opposed to its own subdomain (e.g. gitlab.domain.tld), you may need to add a redirect from domain.tld/oauth pointing at e.g. domain.tld/gitlab/oauth.