Integrate Identity with LDAP¶

The OpenStack Identity service supports integration with existing LDAP directories for authentication and authorization services.

When the OpenStack Identity service is configured to use LDAP back ends, you can split authentication (using the identity feature) and authorization (using the assignment feature).

The identity feature enables administrators to manage users and groups by each domain or the OpenStack Identity service entirely.

The assignment feature enables administrators to manage project role authorization using the OpenStack Identity service SQL database, while providing user authentication through the LDAP directory.

# setsebool -P authlogin_nsswitch_use_ldap on

Identity configuration is split into two separate back ends; identity (back end for users and groups), and assignments (back end for domains, projects, roles, role assignments). To configure Identity, set options in the /etc/keystone/keystone.conf file. See Integrate Identity back end with LDAP for Identity back end configuration examples and Integrate assignment back end with LDAP for assignment back end configuration examples. Modify these examples as needed.

To define the destination LDAP server

Define the destination LDAP server in the keystone.conf file:

1
2
3
4
5
6
7

[ldap]
url = ldap://localhost
user = dc=Manager,dc=example,dc=org
password = samplepassword
suffix = dc=example,dc=org
use_dumb_member = False
allow_subtree_delete = False

1
2

[ldap]
dumb_member = cn=dumb,dc=nonexistent

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.

Query option

Use query_scope to control the scope level of data presented (search only the first level or search an entire sub-tree) through LDAP.

Use page_size to control the maximum results per page. A value of zero disables paging.

Use alias_dereferencing to control the LDAP dereferencing option for queries.

Use chase_referrals to override the system’s default referral chasing behavior for queries.

1
2
3
4
5

[ldap]
query_scope = sub
page_size = 0
alias_dereferencing = default
chase_referrals =

Debug

Use debug_level to set the LDAP debugging level for LDAP calls. A value of zero means that debugging is not enabled.

1
2

[ldap]
debug_level = 0

Connection pooling

Use use_pool to enable LDAP connection pooling. Configure connection pool size, maximum retry, reconnect trials, timeout (-1 indicates indefinite wait) and lifetime in seconds.

1
2
3
4
5
6
7

   [ldap]
   use_pool = true
   pool_size = 10
   pool_retry_max = 3
   pool_retry_delay = 0.1
   pool_connection_timeout = -1
   pool_connection_lifetime = 600

Connection pooling for end user authentication

Use use_auth_pool to enable LDAP connection pooling for end user authentication. Configure connection pool size and lifetime in seconds.

1
2
3
4

[ldap]
use_auth_pool = false
auth_pool_size = 100
auth_pool_connection_lifetime = 60

When you have finished configuration, restart the OpenStack Identity service:

# service keystone restart