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lldap - Light LDAP implementation for authentication

LDAP made easy.

• About
• Installation
• Usage
  • Recommended architecture
• Client configuration
  • Known compatible services
  • General configuration guide
  • Incompatible services
• Frequently Asked Questions
• Contributions

About

This project is a lightweight authentication server that provides an opinionated, simplified LDAP interface for authentication. It integrates with many backends, from KeyCloak to Authelia to Nextcloud and more!

It comes with a frontend that makes user management easy, and allows users to edit their own details or reset their password by email.

The goal is not to provide a full LDAP server; if you're interested in that, check out OpenLDAP. This server is a user management system that is:

• simple to setup (no messing around with slapd),
• simple to manage (friendly web UI),
• low resources,
• opinionated with basic defaults so you don't have to understand the subtleties of LDAP.

It mostly targets self-hosting servers, with open-source components like Nextcloud, Airsonic and so on that only support LDAP as a source of external authentication.

For more features (OAuth/OpenID support, reverse proxy, ...) you can install other components (KeyCloak, Authelia, ...) using this server as the source of truth for users, via LDAP.

By default, the data is stored in SQLite, but you can swap the backend with MySQL/MariaDB or PostgreSQL.

Installation

It's possible to install lldap from OCI images (docker/podman), from Kubernetes, or from a regular distribution package manager (Archlinux, Debian, CentOS, Fedora, OpenSuse, Ubuntu, FreeBSD).

Building from source and cross-compiling to a different hardware architecture is also supported.

Usage

The simplest way to use LLDAP is through the web front-end. There you can create users, set passwords, add them to groups and so on. Users can also connect to the web UI and change their information, or request a password reset link (if you configured the SMTP client).

You can create and manage custom attributes through the Web UI, or through the community-contributed CLI frontend ( Zepmann/lldap-cli). This is necessary for some service integrations.

The bootstrap.sh script can enforce a list of users/groups/attributes from a given file, reflecting it on the server.

To manage the user, group and membership lifecycle in an infrastructure-as-code scenario you can use the unofficial LLDAP terraform provider in the terraform registry.

LLDAP is also very scriptable, through its GraphQL API. See the Scripting docs for more info.

Recommended architecture

If you are using containers, a sample architecture could look like this:

• A reverse proxy (e.g. nginx or Traefik)
• An authentication service (e.g. Authelia, Authentik or KeyCloak) connected to LLDAP to provide authentication for non-authenticated services, or to provide SSO with compatible ones.
• The LLDAP service, with the web port exposed to Traefik.
  • The LDAP port doesn't need to be exposed, since only the other containers will access it.
  • You can also set up LDAPS if you want to expose the LDAP port to the internet (not recommended) or for an extra layer of security in the inter-container communication (though it's very much optional).
  • The default LLDAP container starts up as root to fix up some files' permissions before downgrading the privilege to the given user. However, you can (should?) use the *-rootless version of the images to be able to start directly as that user, once you got the permissions right. Just don't forget to change from the UID/GID env vars to the uid docker-compose field.
• Any other service that needs to connect to LLDAP for authentication (e.g. NextCloud) can be added to a shared network with LLDAP. The finest granularity is a network for each pair of LLDAP-service, but there are often coarser granularities that make sense (e.g. a network for the *arr stack and LLDAP).

Client configuration

Known compatible services

Most services that can use LDAP as an authentication provider should work out of the box. For new services, it's possible that they require a bit of tweaking on LLDAP's side to make things work. In that case, just create an issue with the relevant details (logs of the service, LLDAP logs with verbose=true in the config).

Some specific clients have been tested to work and come with sample configuration files, or guides. See the example_configs folder for example configs for integration with specific services.

Integration with Linux accounts is possible, through PAM and nslcd. See PAM configuration guide. Integration with Windows (e.g. Samba) is WIP.

General configuration guide

To configure the services that will talk to LLDAP, here are the values:

• The LDAP user DN is from the configuration. By default, cn=admin,ou=people,dc=example,dc=com.
• The LDAP password is from the configuration (same as to log in to the web UI).
• The users are all located in ou=people, + the base DN, so by default user bob is at cn=bob,ou=people,dc=example,dc=com.
• Similarly, the groups are located in ou=groups, so the group family will be at cn=family,ou=groups,dc=example,dc=com.

Testing group membership through memberOf is supported, so you can have a filter like: (memberOf=cn=admins,ou=groups,dc=example,dc=com).

The administrator group for LLDAP is lldap_admin: anyone in this group has admin rights in the Web UI. Most LDAP integrations should instead use a user in the lldap_strict_readonly or lldap_password_manager group, to avoid granting full administration access to many services. To prevent privilege escalation users in the lldap_password_manager group are not allowed to change passwords of admins in the lldap_admin group.

Incompatible services

Though we try to be maximally compatible, not every feature is supported; LLDAP is not a fully-featured LDAP server, intentionally so.

LDAP browsing tools are generally not supported, though they could be. If you need to use one but it behaves weirdly, please file a bug.

Some services use features that are not implemented, or require specific attributes. You can try to create those attributes (see custom attributes in the Usage section).

Finally, some services require password hashes so they can validate themselves the user's password without contacting LLDAP. This is not and will not be supported, it's incompatible with our password hashing scheme (a zero-knowledge proof). Furthermore, it's generally not recommended in terms of security, since it duplicates the places from which a password hash could leak.

In that category, the most prominent is Synology. It is, to date, the only service that seems definitely incompatible with LLDAP.

Frequently Asked Questions

• I can't login
• *** Integration
• Migrating from SQLite
• How does lldap compare with OpenLDAP? With FreeIPA? With Kanidm?
• Does lldap support vhosts?
• Does lldap provide commercial support contracts?
• Can I make a *** to fund development?
• Is lldap sustainable? Can we depend on it for our infrastructure?

Contributions

Contributions are welcome! Just fork and open a PR. Or just file a bug.

We don't have a code of conduct, just be respectful and remember that it's just normal people doing this for free on their free time.

Make sure that you run cargo fmt from the root before creating the PR. And if you change the GraphQL interface, you'll need to regenerate the schema by running ./export_schema.sh.

Join our *** server if you have any questions!