You can configure an LDAP Provider for applications that don't support any newer protocols or require LDAP.
Note: This provider requires the deployment of the LDAP Outpost
All users and groups in authentik's database are searchable. Currently, there is limited support for filters (you can only search for objectClass), but this will be expanded in further releases.
Binding against the LDAP Server uses a flow in the background. This allows you to use the same policies and flows as you do for web-based logins. For more info, see Bind modes.
You can configure under which base DN the information should be available. For this documentation we'll use the default of
Users are available under
ou=users,<base DN> and groups under
ou=groups,<base DN>. To aid compatibility, each user belongs to its own "virtual" group, as is standard on most Unix-like systems. This group does not exist in the authentik database, and is generated on the fly. These virtual groups are under the
ou=virtual-groups,<base DN> DN.
The following fields are currently sent for users:
cn: User's username
uid: Unique user identifier
uidNumber: A unique numeric identifier for the user
name: User's name
displayName: User's name
objectClass: A list of these strings:
memberOf: A list of all DNs that the user is a member of
homeDirectory: A default home directory path for the user, by default
/home/$username. Can be overwritten by setting
homeDirectoryas an attribute on users or groups.
ak-active: "true" if the account is active, otherwise "false"
ak-superuser: "true" if the account is part of a group with superuser permissions, otherwise "false"
The following fields are current set for groups:
cn: The group's name
uid: Unique group identifier
gidNumber: A unique numeric identifier for the group
member: A list of all DNs of the groups members
objectClass: A list of these strings:
A virtual group is also created for each user, they have the same fields as groups but have an additional objectClass:
The virtual groups gidNumber is equal to the uidNumber of the user.
Additionally, for both users and (non-virtual) groups, any attributes you set are also present as LDAP Attributes.
Starting with 2021.9.1, custom attributes will override the inbuilt attributes.
Starting with 2023.3, periods and slashes in custom attributes will be sanitized.
SSL / StartTLS
You can also configure SSL for your LDAP Providers by selecting a certificate and a server name in the provider settings.
Starting with authentik 2023.6, StartTLS is supported, and the provider will pick the correct certificate based on the configured TLS Server name field. The certificate is not picked based on the Bind DN, as the StartTLS operation should happen be the bind request to ensure bind credentials are transmitted over TLS.
This enables you to bind on port 636 using LDAPS.
See the integration guide for sssd for an example guide.
All bind modes rely on flows.
The following stages are supported:
Note: Authenticator validation currently only supports DUO, TOTP and static authenticators.
Starting with authentik 2023.6, code-based authenticators are only supported when Code-based MFA Support is enabled in the provider. When enabled, all users that will bind to the LDAP provider should have a TOTP device configured, as otherwise a password might be incorrectly rejected when semicolons are used in the password.
For code-based authenticators, the code must be given as part of the bind password, separated by a semicolon. For example for the password
example-passwordand the code
123456, the input must be
SMS-based authenticators are not supported as they require a code to be sent from authentik, which is not possible during the bind.
In this mode, the outpost will always execute the configured flow when a new bind request is received.
This mode uses the same logic as direct bind, however the result is cached for the entered credentials, and saved in memory for the standard session duration. Sessions are saved independently, meaning that revoking sessions does not remove them from the outpost, and neither will changing a users credentials.
Every LDAP search request will trigger one or more requests to the authentik core API. This will always return the latest data, however also has a performance hit due all the layers the backend requests have to go through, etc.
In this mode, the outpost will periodically fetch all users and groups from the backend, hold them in memory, and respond to search queries directly. This means greatly improved performance but potentially returning old/invalid data.