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me@server01:~$ sudo mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] n
 ... skipping.

By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] n
 ... skipping.

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
 ... skipping.

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] n
 ... skipping.

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!
me@server01:~$

root@server01:~# sudo mysql -u radius -p radius
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 227
Server version: 10.3.25-MariaDB-0ubuntu0.20.04.1 Ubuntu 20.04

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [radius]> show grants;
+---------------------------------------------------------------------------------------------------------------+
| Grants for radius@localhost                                                                                   |
+---------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO `radius`@`localhost` IDENTIFIED BY PASSWORD '*CDFD06B87A8B800EC4B18B9CC06CAEE3A258611A' |
| GRANT ALL PRIVILEGES ON `radius`.* TO `radius`@`localhost`                                                    |
+---------------------------------------------------------------------------------------------------------------+
2 rows in set (0.000 sec)

root@server01:~# sudo  mysql -u root -p -e "use radius;show tables;"
Enter password:
+------------------+
| Tables_in_radius |
+------------------+
| nas              |
| radacct          |
| radcheck         |
| radgroupcheck    |
| radgroupreply    |
| radpostauth      |
| radreply         |
| radusergroup     |
+------------------+

root@server01:/etc/freeradius/3.0/mods-enabled# more /etc/freeradius/3.0/mods-enabled/sql | grep "#" -v | grep -v "^[[:space:]]*$"
sql {
        dialect = "sqlite"
        driver = "rlm_sql_null"
        sqlite {
                filename = "/tmp/freeradius.db"
                busy_timeout = 200
                bootstrap = "${modconfdir}/${..:name}/main/sqlite/schema.sql"
        }
        mysql {
                tls {
                        ca_file = "/etc/ssl/certs/my_ca.crt"
                        ca_path = "/etc/ssl/certs/"
                        certificate_file = "/etc/ssl/certs/private/client.crt"
                        private_key_file = "/etc/ssl/certs/private/client.key"
                        cipher = "DHE-RSA-AES256-SHA:AES128-SHA"
                        tls_required = yes
                        tls_check_cert = no
                        tls_check_cert_cn = no
                }
                warnings = auto
        }
        postgresql {
                send_application_name = yes
        }
        mongo {
                appname = "freeradius"
                tls {
                        certificate_file = /path/to/file
                        certificate_password = "password"
                        ca_file = /path/to/file
                        ca_dir = /path/to/directory
                        crl_file = /path/to/file
                        weak_cert_validation = false
                        allow_invalid_hostname = false
                }
        }
        radius_db = "radius"
        acct_table1 = "radacct"
        acct_table2 = "radacct"
        postauth_table = "radpostauth"
        authcheck_table = "radcheck"
        groupcheck_table = "radgroupcheck"
        authreply_table = "radreply"
        groupreply_table = "radgroupreply"
        usergroup_table = "radusergroup"
        delete_stale_sessions = yes
        pool {
                start = ${thread[pool].start_servers}
                min = ${thread[pool].min_spare_servers}
                max = ${thread[pool].max_servers}
                spare = ${thread[pool].max_spare_servers}
                uses = 0
                retry_delay = 30
                lifetime = 0
                idle_timeout = 60
        }
        client_table = "nas"
        group_attribute = "SQL-Group"
        $INCLUDE ${modconfdir}/${.:name}/main/${dialect}/queries.conf

root@server01:/etc/freeradius/3.0/mods-enabled# more /etc/freeradius/3.0/mods-enabled/sql | grep "#" -v | grep -v "^[[:space:]]*$"
sql {
        dialect = "sqlite"
        driver = "rlm_sql_${dialect}"
        sqlite {
                filename = "/tmp/freeradius.db"
                busy_timeout = 200
                bootstrap = "${modconfdir}/${..:name}/main/sqlite/schema.sql"
        }
        mysql {
                tls {
                        ca_file = "/etc/ssl/certs/my_ca.crt"
                        ca_path = "/etc/ssl/certs/"
                        certificate_file = "/etc/ssl/certs/private/client.crt"
                        private_key_file = "/etc/ssl/certs/private/client.key"
                        cipher = "DHE-RSA-AES256-SHA:AES128-SHA"
                        tls_required = yes
                        tls_check_cert = no
                        tls_check_cert_cn = no
                }
                warnings = auto
        }
        postgresql {
                send_application_name = yes
        }
        mongo {
                appname = "freeradius"
                tls {
                        certificate_file = /path/to/file
                        certificate_password = "password"
                        ca_file = /path/to/file
                        ca_dir = /path/to/directory
                        crl_file = /path/to/file
                        weak_cert_validation = false
                        allow_invalid_hostname = false
                }
        }
        server = "localhost"
        port = 3306
        login = "radius"
        password = "Str0ngR@diusPass"
        radius_db = "radius"
        acct_table1 = "radacct"
        acct_table2 = "radacct"
        postauth_table = "radpostauth"
        authcheck_table = "radcheck"
        groupcheck_table = "radgroupcheck"
        authreply_table = "radreply"
        groupreply_table = "radgroupreply"
        usergroup_table = "radusergroup"
        delete_stale_sessions = yes
        pool {
                start = ${thread[pool].start_servers}
                min = ${thread[pool].min_spare_servers}
                max = ${thread[pool].max_servers}
                spare = ${thread[pool].max_spare_servers}
                uses = 0
                retry_delay = 30
                lifetime = 0
                idle_timeout = 60
        }
        read_clients = yes
        client_table = "nas"
        group_attribute = "SQL-Group"
        $INCLUDE ${modconfdir}/${.:name}/main/${dialect}/queries.conf
}