OpenLDAP: Ашық көзді LDAP протоколының іске асырылуы

OpenLDAP is a free, open source implementation of the Lightweight Directory Access Protocol (LDAP) developed by the OpenLDAP Project. It is released under its own BSD style license called the OpenLDAP Public License. LDAP is a platform independent protocol. Several common Linux distributions include OpenLDAP Software for LDAP support. The software also runs on BSD variants, as well as AIX, Android, HP UX, macOS, OpenVMS, Solaris, Microsoft Windows (NT and derivatives, e. g. 2000, XP, Vista, Windows 7, etc. ), and z/OS.

The OpenLDAP project was started in 1998 by Kurt Zeilenga. The project started by cloning the LDAP reference source from the University of Michigan where a long running project had supported development and evolution of the LDAP protocol until that project's final release in 1996.

as of 2015, the OpenLDAP project has four core team members: Howard Chu (chief architect), Quanah Gibson Mount, Hallvard Furuseth, and Kurt Zeilenga. There are numerous other important and active contributors including Ondrej Kuznik, Luke Howard, Ryan Tandy, and Gavin Henry. Past core team members include Pierangelo Masarati.

Ordinarily an LDAP request is received by the frontend, decoded, and then passed to a backend for processing. When the backend completes a request, it returns a result to the frontend, which then sends the result to the LDAP client. An overlay is a piece of code that can be inserted between the frontend and the backend. It is thus able to intercept requests and trigger other actions on them before the backend receives them, and it can also likewise act on the backend's results before they reach the frontend. Overlays have complete access to the slapd internal APIs, and so can invoke anything the frontend or other backends could perform. Multiple overlays can be used at once, forming a stack of modules between the frontend and the backend. Overlays provide a simple means to augment the functionality of a database without requiring that an entirely new backend be written, and allow new functionalities to be added in compact, easily debuggable and maintainable modules. Since the introduction of the overlay feature in OpenLDAP 2.2 many new overlays have been contributed from the OpenLDAP community.

OpenLDAP supports replication using Content Synchronization as specified in RFC 4533. This spec is hereafter referred to as "syncrepl". In addition to the base specification, an enhancement known as delta syncrepl is also supported. Additional enhancements have been implemented to support multi master replication.

The basic synchronization operation is described in RFC 4533.