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 SINGLEVALUE
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 specific 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 occur-rences, occurrences,
rences, 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 triggers 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 stor-age storage
age backends. In case the URI expansion is very resource-intensive and occurs frequently with well-defined welldefined
defined patterns, one should consider adding a proxycache later on in the overlay stack.
EXAMPLE
This example collects all the email addresses of a database into a single entry; first of all, make
sure that slapd.conf contains the directives:
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 ALSO
slapd.conf(5), slapd(8). The slapo-dynlist(5) overlay supports dynamic configuration via back-con-fig. back-config.
fig.
ACKNOWLEDGEMENTS
This module was written in 2004 by Pierangelo Masarati for SysNet s.n.c.
OpenLDAP 2.3.27 2006/08/19 SLAPO-DYNLIST(5)
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