NAME

slapo-autogroup - automatic updates of group memberships which meet the requirements of any filter contained in the group definition.

SYNOPSIS

In slapd.conf:
...
include ETCDIR/schema/dyngroup.schema
...
moduleload autogroup.so
...
database ...
...
overlay autogroup
autogroup-attrset groupOfURLs memberURL member

DESCRIPTION

The autogroup overlay to slapd(8) allows automated updates of group memberships which meet the requirements of any filter contained in the group definition. The filters are built from LDAP URI-valued attributes. Any time an object is added/deleted/updated, it is tested for compliance with the filters, and its membership is accordingly updated. For searches and compares, it behaves like a static group. If the attribute part of the URI is filled, the group entry is populated by the values of this attribute in the entries resulting from the search.

Note that filters that use attributes that are themselves dynamically computed may not work consistently, and should be avoided.

CONFIGURATION

Either slapd.conf(5) or the cn=config methodology of slapd-config(5) may be used for configuring autogroup. Both syntaxes are provided here for convenience:

autogroup-attrset <group-oc> <URL-ad> <member-ad>

olcAutoGroupAttrSet: <group-oc> <URL-ad> <member-ad>

This defines the objectclass-attribute-URI mappings defining the automatically managed groups, and may appear multiple times.

The value <group-oc> is the name of the objectClass that represents the group.

The value <URL-ad> is the name of the attributeDescription that contains the URI that is converted to the filters. If no URI is present, there will be no members in that group. It must be a subtype of labeledURI.

The value <member-ad> is the name of the attributeDescription that specifies the member attribute. User modification of this attribute is disabled for consistency.

autogroup-memberof-ad <memberof-ad>

olcAutoGroupMemberOfAd <memberof-ad>

This defines the attribute that is used by the memberOf overlay to store the names of groups that an entry is member of; it must be DN-valued. It should be set to the same value as memberof-memberof-ad. It defaults to 'memberOf'.

EXAMPLES

As above in SYNOPSIS, or with memberof:

...
include ETCDIR/schema/dyngroup.schema
include ETCDIR/schema/memberof.schema
...
moduleload autogroup.so
moduleload memberof.so
...
database ...
...
overlay memberof
memberof-memberof-ad foo
...
overlay autogroup
autogroup-attrset groupOfURLs memberURL member
autogroup-memberof-ad foo

CAVEATS

As with static groups, update operations on groups with a large number of members may be slow. If the attribute part of the URI is specified, modify and delete operations are more difficult to handle. In these cases the overlay will try to detect if groups have been modified and then simply refresh them. This can cause performance hits if the search specified by the URI deals with a significant number of entries.

BACKWARD COMPATIBILITY

The autogroup 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:

•: olcAGattrSet is replaced with olcAutoGroupAttrSet
•: olcAGmemberOfAd is replaced with olcAutoGroupMemberOfAd
•: olcAutomaticGroups is replaced with olcAutoGroupConfig

ACKNOWLEDGEMENTS

This module was originally written in 2007 by Michał Szulczyński. Further enhancements were contributed by Howard Chu, Raphael Ouazana, Norbert Pueschel, and Christian Manal. Manpage updates provided by Emily Backes.