Cool Solution - Custom LDAP ACLs

Version 4.1

Note: Cool Solutions are articles documenting additional functionality based on Univention products. Packages provided by a Cool Solutions Repository are built by Univention, but will not be maintained. Not all of the shown steps in the article are covered by Univention Support. For questions about your support coverage contact your contact person at Univention before you want to implement one of the shown steps.

Also regard the legal notes at Terms of Service.

Note: This article is not yet reviewed.

Introduction

This article will show you how to assign rights on a user of your choice via Custom LDAP ACLs for managing domain users and groups.

Installation

First of all install the package univention-custom-ldap-acls via the command

univention-install univention-custom-ldap-acls

The package should be create some new UCR variables. Check these with the following command

ucr search acls

You should see these variables:

ldap/acls/custom/univentionCustomACLReferenceGroupModify/attrs: uniqueMember,memberUid
ldap/acls/custom/univentionCustomACLReferenceGroupModify/create: no
ldap/acls/custom/univentionCustomACLReferenceGroupModify/description: Edit groups
ldap/acls/custom/univentionCustomACLReferenceGroupModify/filter: objectClass=univentionGroup
ldap/acls/custom/univentionCustomACLReferenceUserCreate/create: yes
ldap/acls/custom/univentionCustomACLReferenceUserCreate/description: Edit user
ldap/acls/custom/univentionCustomACLReferenceUserCreate/filter: objectClass=posixAccount

Create extended attributes

After that, switch to the Univention Management Console and open the LDAP directory module. Expand the tab univention and search for custom attributes -> LDAP ACLs

Create the two custom attributes, e.g groups modify and users-create, and fill out the textfields like the following template.

First tab:

name: <users-create or group-modify>
shortDescription: Anlegen von Benutzern

Second Tab:

module: container/cn
module: container/ou

Third tab:

objectClass: univentionCustomACLReferences
ldapMapping: univentionCustomACLReferenceUserCreate
deleteObjectClass: 1 (it's a checkbox)

Fourth tab:

tabPosition: 1
tabName: Berechtigungen

Last tab:

syntax: userDn
multivalue: 1 (it's a checkbox)
ValueMayChange: 1 (it's a checkbox)

Editing container

The next step is, to modify the users container in the LDAP directory module. Edit the container via right click -> Edit and move to the tab authorization. Now you can add one or more userDNs to assigning authorizations to that users, e.g execute the following command in the command line (replace <username>):

univention-ldapsearch uid=<username> | grep ^dn 

The output should be something as the follows:

dn: uid=<username>,cn=users,dc=example,dc=com

Copy the output, except the dn:, into the text field and click on save.

Create policies for users

The next step is, to give the user the permission to use the users module after the log in. Go to the users module and open the user, that you placed in the authorization field. Move to the tab Policies and open Policy: UMC. Create a new entry and name it "edit-user". Choose "UDM - Users (udm-users)" as an allowed UMC operation. Create another new entry in the same policy and name it "edit-groups". Choose "UDM - Groups (udm-groups)" as an allowed UMC operation and save the settings after that.

Now the user is qualified to access the users and groups module via the UMC.

Assigning permissions for user creation

If you want to assign a user the permission to create a user, create and change the following UCR variables:

ucr set ldap/acls/custom/univentionCustomACLReferenceGroupModify/create="yes" 
ldap/acls/temporary_objects/groups=<DN of the group of your user>

Now edit the container groups and temporary (below the container univention) as described in section "Editing container". Make sure the DN of your user is in the textfield "editing user" and editing groups.

After that, execute the following command to restart your LDAP server:

invoke-rc.d slapd restart

At this point, it should be possible to create another user with your domain user.

Further information

Further information about using UCR