openproject/docs/system-admin-guide/authentication/ldap-authentication/ldap-group-synchronization

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Synchronize LDAP and OpenProject groups (Premium feature)

Note: This feature is available for the Enterprise Edition only for OpenProject versions 7.4+. For more information and differences to CE, see this page.

In OpenProject EE, you can synchronize LDAP group memberships defined through the groupOfNames LDAP object class. This guide assumes that you:

• • have at least one group defined in OpenProject (See the “Managing groups” guide for more information on how to create and edit groups),
  • have set up your LDAP authentication source (See the “Manage LDAP authentication” guide)
  • have at least one LDAP entry with a groupOfNames object class and at least one member reference to an entry within your base DN of your LDAP authentication source. We use the inverse memberOf filter to determine the members of a group entry.

**Please note**: OpenProject does not support other attributes other than the `member` / `memberOf` property to define groups.

For the sake of simplicity, we assume that in this guide, your LDAP structure looks like the following:

You have two groups cn=groupA,ou=groups,ou=example,ou=com and cn=groupB,ou=groups,ou=example,ou=com with two and one users, respectively*.* Your base DN is ou=people,ou=example,ou=com.

LDAP group synchronization

LDAP group synchronization augments the memberships defined by administrators in an existing OpenProject group. Important things to note are:

• Only existing groups and users in OpenProject can be synchronized. The functionality will not simply create all entries in the LDAP group base nor will it synchronize users that do not exist in OpenProject.
• Group synchronization have to be enabled by an administrator by creating a synchronized LDAP group that ties the OpenProject group to an LDAP entry.
• Only synchronized memberships will be removed from the OpenProject group. If you want to add a user outside your LDAP authentication to an OpenProject group, you can safely do so without the membership being removed.

Configure synchronized LDAP group

In order to get to the LDAP group sync administration pane, expand the LDAP authentication menu item in your administration.

Define group base and key settings

In order for the LDAP groups plugin to locate your group entries, you first need to set the group key to cn (the identifying attribute of the group entries) and group base to ou=groups,ou=example,ou=com as shown in the following screenshot.

Create a synchronized group

To create a new synchronized group, use the button on the top right of the page. There, you will select your LDAP authentication source that contains the group, as well as the existing OpenProject group that members should be synchronized to. The following options can be set:

• LDAP connection: Select the LDAP connection you want this synchronized group to use. Users created by group synchronization will be tied to that LDAP and may bind against it for authentication.
• DN: Enter the full distinguished name (DN) of the group you want to synchronize. For example: cn=team1,ou=groups,dc=example,dc=com.
• Sync users: Check this option if you want members of this group to be automatically created in OpenProject. When unchecked, only members of the group that also are existing users in OpenProject can be synchronized.
• Group: Select an OpenProject group you want the members of the LDAP group to synchronize to.

Click on Create to finish the creation of the synchronized group. The LDAP memberships of each user will be synchronized hourly through a background job on your packaged installation. Changes and output will be logged to /var/log/openproject/cron-hourly.log.

If you want to trigger the synchronization manually you can do so by running the respective rake task directly. In the packaged installation, for instance, this would work like this:

sudo openproject run bundle exec rake ldap_groups:synchronize

This method of creating synchronized groups is well-suited for a small number of groups, or a very individual set of groups that you need to synchronize. It is very flexible by allowing individual groups to synchronize users into OpenProject.

If you need to synchronize a large number of groups that follow a common pattern, consider using the following filter functionality.

Configure synchronized LDAP filter

Instead of manually synchronizing groups from a given DN, you can also create filter objects that will query the LDAP not only for group members, but the groups themselves.

When the synchronization task is executed, the filter is being queried against the LDAP and resulting group objects will be created as synchronized groups and as OpenProject groups.

Create a synchronized filter

To create a new synchronized filter, use the button on the top right of the index page. There, you will select your LDAP authentication source that should be queried. The following properties can be set:

• Name: Name of the LDAP filter, only for organizational purposes
• Group name attribute: The attribute used for naming the associated OpenProject groups.
• Sync users: Check this option if you want members of all synchronized groups this filter creates to be automatically created in OpenProject. When unchecked, only members of any group that also are existing users in OpenProject can be synchronized.
• LDAP connection: Select the LDAP connection you want this synchronized filter to use. Users created by group synchronization will be tied to that LDAP and may bind against it for authentication.
• Search base DN: (optional) Enter the base DN of the LDAP subtree you want to perform the search in. If you leave this unset, the base DN of the LDAP connection will be used instead. The DN specified here must contain the base DN of the LDAP connection to be valid.
• LDAP filter: The LDAP filter string to be used for identifying LDAP group entries to be synchronized with OpenProject.

Click on Create to finish the creation of the synchronized filter. This filter is being executed hourly as part of the background job before the actual group synchronization runs.

Note: If you manually create a synchronized group that is also found by a filter, its properties (such as the Sync users setting) is being overridden by the filter setting.