Provided by: slapd_2.5.13+dfsg-1ubuntu1_amd64 
NAME
slapo-dynlist - Dynamic List overlay to slapd
SYNOPSIS
/etc/ldap/slapd.conf
DESCRIPTION
The dynlist overlay to slapd(8) allows expansion of dynamic groups and more. Any time an
entry with a specific objectClass (defined in the overlay configuration) is being
returned, the LDAP URI-valued occurrences of a specific attribute (also defined in the
overlay configuration) 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 found during the
list expansion appears in the final entry. All dynamic behavior is disabled when the
manageDSAit control (RFC 3296) is used. In that case, the contents of the dynamic group
entry is returned; namely, the URLs are returned instead of being expanded.
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 defined for the dynlist overlay. It may have
multiple occurrences, and it must appear after the overlay directive.
dynlist-attrset <group-oc> [<URI>] <URL-ad> [[<mapped-ad>:]<member-ad>[+<memberOf-
ad[@<static-oc>[*]] ...]
The value group-oc is the name of the objectClass that triggers the dynamic
expansion of the data.
The optional URI restricts expansion only to entries matching the DN, the scope and
the filter portions of the URI.
The value URL-ad is the name of the attributeDescription that contains 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 URIs in the URL-ad attribute must
be absent, and the DNs of all the entries resulting from the expansion of the URIs
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. If the optional memberOf-ad attribute is
also specified, then it will be populated with the DNs of the dynamic groups that
an entry is a member of. If the optional static-oc objectClass is also specified,
then the memberOf attribute will also be populated with the DNs of the static
groups that an entry is a member of. If the optional * character is also
specified, then the member and memberOf values will be populated recursively, for
nested groups. Note that currently nesting is only supported for Search operations,
not Compares.
Alternatively, mapped-ad can be used to remap attributes obtained through
expansion. member-ad attributes are not filled by expanded DN, but are remapped as
mapped-ad attributes. Multiple mapping statements can be used. The memberOf-ad
option is not used in this case.
The dynlist overlay may be used with any backend, but it is mainly intended for use with
local storage backends. In case the URI expansion is very resource-intensive and occurs
frequently with well-defined patterns, one should consider adding a proxycache later on in
the overlay stack.
AUTHORIZATION
By default the expansions are performed using the identity of the current LDAP user. This
identity may be overridden by setting the dgIdentity attribute in the group's entry to the
DN of another LDAP user. In that case the dgIdentity will be used when expanding the URIs
in the object. Setting the dgIdentity to a zero-length string will cause the expansions
to be performed anonymously. Note that the dgIdentity attribute is defined in the
dyngroup schema, and this schema must be loaded before the dgIdentity authorization
feature may be used. If the dgAuthz attribute is also present in the group's entry, its
values are used to determine what identities are authorized to use the dgIdentity to
expand the group. Values of the dgAuthz attribute must conform to the (experimental)
OpenLDAP authz syntax. When using dynamic memberOf in search filters, search access to
the entryDN pseudo-attribute is required.
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
A dynamic group with dgIdentity authorization could be created with an entry like
dn: cn=Dynamic Group,ou=Groups,dc=example,dc=com
objectClass: groupOfURLs
objectClass: dgIdentityAux
cn: Dynamic Group
memberURL: ldap:///ou=People,dc=example,dc=com??sub?(objectClass=person)
dgIdentity: cn=Group Proxy,ou=Services,dc=example,dc=com
This example extends the dynamic group feature to add a dynamic dgMemberOf attribute to
all the members of a dynamic group:
include /path/to/dyngroup.schema
# ...
database <database>
# ...
overlay dynlist
dynlist-attrset groupOfURLs memberURL member+dgMemberOf
This example extends the dynamic memberOf feature to add the memberOf attribute to all the
members of both static and dynamic groups:
include /path/to/dyngroup.schema
# ...
database <database>
# ...
overlay dynlist
dynlist-attrset groupOfURLs memberURL member+memberOf@groupOfNames
This dynamic memberOf feature can fully replace the functionality of the slapo-memberof(5)
overlay.
FILES
/etc/ldap/slapd.conf
default slapd configuration file
BACKWARD COMPATIBILITY
The dynlist overlay has been reworked with the 2.5 release to use a consistent namespace
as with other overlays. As a side-effect the following cn=config parameters are deprecated
and will be removed in a future release: olcDlAttrSet is replaced with olcDynListAttrSet
olcDynamicList is replaced with olcDynListConfig
SEE ALSO
slapd.conf(5), slapd-config(5), slapd(8). The slapo-dynlist(5) overlay supports dynamic
configuration via back-config.
BUGS
Filtering on dynamic groups may return incomplete results if the search operation uses the
pagedResults control.
ACKNOWLEDGEMENTS
This module was written in 2004 by Pierangelo Masarati for SysNet s.n.c.
Attribute remapping was contributed in 2008 by Emmanuel Dreyfus.