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X.500 is an overall model for Directory Services in the OSI world. The model encompasses the overall namespace and the protocol for querying and updating it. The protocol is known as "DAP" (Directory Access Protocol). DAP runs over the OSI network protocol stack -- that, combined with its very rich data model and operation set makes it quite "heavyweight". It is rather tough to implement a full-blown DAP client and have it "fit" on smaller computer systems. Thus, the folks at University of Michigan, with help from the ISODE Consortium, designed and developed...
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A major part of X.500 is that it defines a global directory structure. It is essentially a directory web in much the same way that http & html are used to define & implement the gobal hypertext web. Anyone with an X.500 (or LDAP client) may browse the global directory just as they can use a web browser to browse Web.
LDAP, or "Lightweight Directory Access Protocol" is, like X.500, both an information model and a protocol for querying and manipulating it. LDAP's overall data and namespace model is essentially that of X.500. The major difference is that the LDAP protocol itself is designed to run directly over the TCP/IP stack, and it lacks some of the more esoteric DAP protocol functions. It is simpler then X500.
THere are at least half dozen popular LDAP servers:
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This article by Tim Howes does a good job of laying out what LDAP
is good for and what it is not..
LDAP: Use as Directed -- The co-author of LDAP sets the record
straight on what the protocol can and can't do.
The following is an annotated list of pointers to information sources. Start at the begining if you're an X.500/LDAP/Directory newbie. Else, peruse the list and start whereever seems appropriate. Happy hunting...
This document doesnot purport to be the last, best, or most recent word on LDAP or developments in the directory community. THIS DOCUMENT IS UPDATED AND OTHERWISE MAINTAINED ON A BEST-EFFORTS BASIS. This information is provided AS IS, with no guaranties at all. It is the readers' responsibility to keep themselves up-to-date and aware of developments by whatever means they have available. I trust the pointers and info here help in that effort.Please be sure to peruse the pages pointed to in the last three (3) items above for information that is likely more current, in terms of recent developments, than that here. Thanks.
These are basic introductory documents to directory services in general, and X.500 and LDAP in particular. I've arranged them to be read nominally in this order -- but that's entirely up to the reader. There's a fair amount of overlap in the overview docs, fyi....
These documents discuss Directory attributes and their syntaxes. You need to read this stuff if you're setting up your directory and mapping your organization's information into the it and/or if you're creating new attributes.
The above defines a small set of "short" attribute names, although it
doesn't define the full set as is commonly in present use within the
LDAP community. Clearly defining those is a topic of future work in
the IETF directory-oriented working groups.
The above item is a good overview of the subject matter, though with
a Quipu orientation. Quipu is an (old) X.500 server implementation from
ISODE, Ltd.
This RFC discusses how to organize one's directory. It applies to standalone
LDAP-based directories as well as X.500-based ones.
This paper describes how we might utilize LDAP and the DNS to achieve
a directory service framework in the near term. It specifically proposes
a new DNS record, "DX", to be used to locate an administrative domain's
directory service. The DX concept has been recently superseeded however,
by the "SRV" (service) record concept, which could be utilized instead.
See rfc2052, below.
LDAPv3 was annointed Proposed Standard status by the IESG (Internet Engineering Steering Group) in early December '97.
See: Current State of the LDAP Protocol Specifications (LDAPv3, LDAPv2)
There is a fair amount of work going on currently in the IETF on directory services in general, and X.500/LDAP in particular. Most of this work is occuring within the Applications area of the IETF.
The IETF doesn't "work on" X.500. That is the domain of the International Telecommunications Union (ITU).
Get yer LDAP clients (for Mac, PC, and UNIX/X) here, as well as servers
and other goodies. Note that this site also has the complete
Standalone Ldap Daemon (slapd) documentation on-line, as well
as other documents and pointers to further information. Be sure to see
the link to the patch repository, below.
vailable, full-blown, native (tho somewhat old) X.500 server technology
and information here. They charge money for their up-to-date product
line. Also a second site for LDAP stuff.
The above module is based on the
Netscape LDAP SDK (aka client-side library) and includes example
working CGI scripts which implement a web-based directory frontend.
"LDAP and X.500 and not title:"Web500gw" with ranking spec of: "ldap
X.500 repository FAQ experience"
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Last modified: March 12, 2019