openstack-manuals/doc/admin-guide-cloud/source/keystone_integrate_assignment_backend_ldap.rst

Integrate assignment back end with LDAP

When you configure the OpenStack Identity service to use LDAP servers, you can split authentication and authorization using the assignment feature. Integrating the assignment back end with LDAP allows administrators to use projects (tenant), roles, domains, and role assignments in LDAP.

Note

Using LDAP as an assignment back end is not recommended.

Note

The OpenStack Identity service does not support domain-specific assignment back ends.

Important

For OpenStack Identity assignments to access LDAP servers, you must define the destination LDAP server in the keystone.conf file. For more information, see integrate-identity-with-ldap.

Integrating assignment back ends with LDAP

1. Enable the assignment driver. In the [assignment] section, set the driver configuration key to keystone.assignment.backends.sql.Assignment:

   [assignment]
   #driver = keystone.assignment.backends.sql.Assignment
   driver = keystone.assignment.backends.ldap.Assignment

2. Create the organizational units (OU) in the LDAP directory, and define their corresponding location in the keystone.conf file:

   [ldap]
   role_tree_dn =
   role_objectclass = inetOrgPerson
   
   project_tree_dn = ou=Groups,dc=example,dc=org
   project_objectclass = groupOfNames

   Note

   These schema attributes are extensible for compatibility with various schemas. For example, this entry maps to the groupOfNames attribute in Active Directory:

   project_objectclass = groupOfNames

3. A read-only implementation is recommended for LDAP integration. These permissions are applied to object types in the keystone.conf file:

   [ldap]
   role_allow_create = False
   role_allow_update = False
   role_allow_delete = False
   
   project_allow_create = False
   project_allow_update = False
   project_allow_delete = False

4. Restart the OpenStack Identity service:

   # service keystone restart

   Warning

   During service restart, authentication and authorization are unavailable.

Additional LDAP integration settings.

Set these options in the /etc/keystone/keystone.conf file for a single LDAP server, or /etc/keystone/domains/keystone.DOMAIN_NAME.conf files for multiple back ends.

Filters

Use filters to control the scope of data presented through LDAP.

[ldap]
project_filter = (member=cn=openstack-user,ou=workgroups,
dc=example,dc=org)
role_filter =

Warning

Filtering method

Assignment attribute mapping

Mask account status values (include any additional attribute mappings) for compatibility with various directory services. Superfluous accounts are filtered with user_filter.

Setting attribute ignore to list of attributes stripped off on update.

[ldap]
role_id_attribute = cn
role_name_attribute = ou
role_member_attribute = roleOccupant
role_additional_attribute_mapping =
role_attribute_ignore =

project_id_attribute = cn
project_name_attribute = ou
project_member_attribute = member
project_desc_attribute = description
project_enabled_attribute = enabled
project_domain_id_attribute = businessCategory
project_additional_attribute_mapping =
project_attribute_ignore =

Enabled emulation

An alternative method to determine if a project is enabled or not is to check if that project is a member of the emulation group.

Use DN of the group entry to hold enabled projects when using enabled emulation.

[ldap]
project_enabled_emulation = false
project_enabled_emulation_dn = false