GitLab

Tested Versions #

• Authelia
  • v4.35.5
• GitLab CE
  • 14.0.1

Before You Begin #

Common Notes #

1. The OpenID Connect 1.0 client_id parameter:
   1. This must be a unique value for every client.
   2. The value used in this guide is merely for demonstration purposes and you can theoretically use nearly any alphanumeric string.
2. The OpenID Connect 1.0 secret parameter:
   1. The value used in this guide is merely for demonstration purposes and you should absolutely not use this in production and should instead utilize the How Do I Generate Client Secrets FAQ.
   2. This string may be stored as plaintext in the Authelia configuration but this behaviour is deprecated and is not guaranteed to be supported in the future. See the Plaintext guide for more information.
3. The Configuration example for Authelia is only a portion of the required configuration and it should be used as a guide in conjunction with the standard OpenID Connect 1.0 Configuration guide.

Assumptions #

This example makes the following assumptions:

• Application Root URL: https://gitlab.example.com
• Authelia Root URL: https://auth.example.com
• Client ID: gitlab
• Client Secret: insecure_secret

Configuration #

Application #

To configure GitLab to utilize Authelia as an OpenID Connect 1.0 Provider:

1. Add the Omnibus OpenID Connect 1.0 OmniAuth configuration to gitlab.rb:

gitlab_rails['omniauth_providers'] = [
  {
    name: "openid_connect",
    label: "Authelia",
    icon: "https://www.authelia.com/images/branding/logo-cropped.png",
    args: {
      name: "openid_connect",
      scope: ["openid","profile","email","groups"],
      response_type: "code",
      issuer: "https://auth.example.com",
      discovery: true,
      client_auth_method: "query",
      uid_field: "preferred_username",
      send_scope_to_token_endpoint: "false",
      client_options: {
        identifier: "gitlab",
        secret: "insecure_secret",
        redirect_uri: "https://gitlab.example.com/users/auth/openid_connect/callback"
      }
    }
  }
]

Authelia #

The following YAML configuration is an example Authelia client configuration for use with GitLab which will operate with the above example:

identity_providers:
  oidc:
    ## The other portions of the mandatory OpenID Connect 1.0 configuration go here.
    ## See: https://www.authelia.com/c/oidc
    clients:
    - id: gitlab
      description: GitLab
      secret: '$pbkdf2-sha512$310000$c8p78n7pUMln0jzvd4aK4Q$JNRBzwAo0ek5qKn50cFzzvE9RXV88h1wJn5KGiHrD0YKtZaR/nCb2CJPOsKaPK0hjf.9yHxzQGZziziccp6Yng'  # The digest of 'insecure_secret'.
      public: false
      authorization_policy: two_factor
      redirect_uris:
        - https://gitlab.example.com/users/auth/openid_connect/callback
      scopes:
        - openid
        - profile
        - groups
        - email
      userinfo_signing_algorithm: none

See Also #

• GitLab OpenID Connect OmniAuth Documentation