MemberOf Plugin - Auto Add Objectclass


Overview

Starting in 389-ds-base-1.3.3 most the DS plugins are now backend transaction plugins, which means that is a plugin fails to perform its “task” the entire operation is aborted. This can cause unexpected failures after upgrading. A very common problem with the MemberOf Plugin is that “member entries” do not have an objectclass that allows the “memberOf” attribute. This new feature allows you set a predefined objectclass in the plugin config entry that will be added to a “member entry” if that entry does not have an objectclass that allows the “memberOf” attribute.

Use Cases

When using the MemberOf Plugin for the first time you would need to add an objectclass that allows the “memberOf” attribute like “inetUser” to all the entries that could be potential members of groups (including groups). This can potentially be a lot of work, and it can also be hard to diagnose that the reason memberOf plugin is not working as expected is because of schema. This new feature can automatically update all your entries to have a proper objectclass for you. Saving a lot of time and frustration.

Design

If an objectclass is predefined, and the plugin fails to add the “memberOf” attribute due to a objectclass violation (error 65), the plugin will attempt to add the predefined objectclass to the entry and retry to add the “memberOf” attribute to the entry. If it fails again, the entire operation is aborted. Here is an example of the new config setting memberofAutoAddOC:

dn: cn=MemberOf Plugin,cn=plugins,cn=config
objectClass: top
objectClass: nsSlapdPlugin
objectClass: extensibleObject
cn: MemberOf Plugin
memberofGroupAttr: member
memberofAttr: memberOf
memberofAutoAddOC: inetUser

Here we are using the standard objectclass inetUser, but it could be any objectclass that allows the “memberOf” attribute. This config setting takes effect immediately, and does not require a server restart to take effect.

Implementation

Need to an existing objectclass that allows the attribute “memberOf”

Major configuration options and enablement

The memberOf plugin config entry, or the shared config entry, need to be updated.

Replication

None.

Updates and Upgrades

None.

Dependencies

None.

External Impact

None.

Author

mreynolds@redhat.com

Last modified on 9 September 2015