OpenDJ Administration Guide
11.1. About OpenDJ Password Policies

The password policy that applies to a user is identified by the operational attribute, pwdPolicySubentry.

$ ldapsearch --port 1389 --baseDN dc=example,dc=com uid=bjensen pwdPolicySubentry
dn: uid=bjensen,ou=People,dc=example,dc=com
pwdPolicySubentry: cn=Default Password Policy,cn=Password Policies,cn=config