SLAPO-DYNLIST(5)SLAPO-DYNLIST(5)NAME
slapo-dynlist - Dynamic List overlay
SYNOPSIS
/etc/openldap/slapd.conf
DESCRIPTION
The dynlist overlay to slapd(8) allows expansion of dynamic groups and
more. Any time an entry with a specific objectClass is being returned,
the LDAP URI-valued occurrences of a specific attribute are expanded
into the corresponding entries, and the values of the attributes listed
in the URI are added to the original entry. No recursion is allowed,
to avoid potential infinite loops. The resulting entry must comply
with the LDAP data model, so constraints are enforced. For example, if
a SINGLE-VALUE attribute is listed, only the first value results in the
final entry.
CONFIGURATION
The config directives that are specific to the dynlist overlay must be
prefixed by dynlist-, to avoid potential conflicts with directives spe‐
cific to the underlying database or to other stacked overlays.
overlay dynlist
This directive adds the dynlist overlay to the current database,
or to the frontend, if used before any database instantiation;
see slapd.conf(5) for details.
This slapd.conf configuration option is define for the dynlist overlay.
It may have multiple occurrences, and it must appear after the overlay
directive.
dynlist-attrset <group-oc> <URL-ad> [<member-ad>]
The value <group-oc> is the name of the objectClass that trig‐
gers the dynamic expansion of the data.
The value <URL-ad> is the name of the attributeDescription that
cointains the URI that is expanded by the overlay; if none is
present, no expansion occurs. If the intersection of the
attributes requested by the search operation (or the asserted
attribute for compares) and the attributes listed in the URI is
empty, no expansion occurs for that specific URI. It must be a
subtype of labeledURI.
The value <member-ad> is optional; if present, the overlay
behaves as a dynamic group: this attribute will list the DN of
the entries resulting from the internal search. In this case,
the <attrs> portion of the URI must be absent, and the DNs of
all the entries resulting from the expansion of the URI are
listed as values of this attribute. Compares that assert the
value of the <member-ad> attribute of entries with <group-oc>
objectClass apply as if the DN of the entries resulting from the
expansion of the URI were present in the <group-oc> entry as
values of the <member-ad> attribute.
The dynlist overlay may be used with any backend, but it is mainly
intended for use with local storage backends. In case the URI expan‐
sion is very resource-intensive and occurs frequently with well-defined
patterns, one should consider adding a proxycache later on in the over‐
lay stack.
EXAMPLE
This example collects all the email addresses of a database into a sin‐
gle entry; first of all, make sure that slapd.conf contains the direc‐
tives:
include /path/to/dyngroup.schema
# ...
database <database>
# ...
overlay dynlist
dynlist-attrset groupOfURLs memberURL
and that slapd loads dynlist.la, if compiled as a run-time module; then
add to the database an entry like
dn: cn=Dynamic List,ou=Groups,dc=example,dc=com
objectClass: groupOfURLs
cn: Dynamic List
memberURL: ldap:///ou=People,dc=example,dc=com?mail?sub?(objectClass=person)
If no <attrs> are provided in the URI, all (non-operational) attributes
are collected.
This example implements the dynamic group feature on the member
attribute:
include /path/to/dyngroup.schema
# ...
database <database>
# ...
overlay dynlist
dynlist-attrset groupOfURLs memberURL member
FILES
/etc/openldap/slapd.conf
default slapd configuration file
SEE ALSOslapd.conf(5), slapd(8). The slapo-dynlist(5) overlay supports dynamic
configuration via back-config.
ACKNOWLEDGEMENTS
This module was written in 2004 by Pierangelo Masarati for SysNet
s.n.c.
OpenLDAP 2.3.24 2006/05/30 SLAPO-DYNLIST(5)