[root@r2d2 ~]# su - postgres
-sh-3.2$ psql -l
Password:

[root@r2d2 ~]# cat /var/lib/pgsql/data/pg_hba.conf
LOCAL   ALL     postgres                                        trust
LOCAL   ALL    ALL                                       password
host    ALL    ALL    127.0.0.1       255.255.255.255    password
host    ALL    ALL    0.0.0.0         0.0.0.0            password