Enable MariaDB SSL
I have to make my MariaDB authentication a bit safer than default. I tried to set up SSL support for this, but found only an old howto here:
How to enable MySQL SSL on Ubuntu
I followed it, however after checking I get this:
MariaDB [(none)]> show variables like "%ssl%";
+---------------+----------------------------+
| Variable_name | Value |
+---------------+----------------------------+
| have_openssl | NO |
| have_ssl | DISABLED |
| ssl_ca | /etc/mysql/ca-cert.pem |
| ssl_capath | |
| ssl_cert | /etc/mysql/server-cert.pem |
| ssl_cipher | |
| ssl_crl | |
| ssl_crlpath | |
| ssl_key | /etc/mysql/server-key.pem |
+---------------+----------------------------+
9 rows in set (0.00 sec)
MariaDB [(none)]> \s
...
SSL: not in use
...This source was written in 2011. Maybe it is outdated, or I've made a mistake somewhere. When I generated .pems there were no errors. My /var/log/mysql/error.log file is empty.
Do you have any ideas?
12 Answers
To enable ssl within mariadb your version needs to be compiled with ssl (have_ssl | DISABLED) and you need to enable it within your mysql config:
# grep -Ri ssl /etc/mysql/my.cnf
ssl = true
ssl-ca = /etc/mysql/cacert.pem
ssl-cert = /etc/mysql/server-cert.pem
ssl-key = /etc/mysql/server-key.pemafter a restart or the mysql process ssl should be enabled.
sidenote
this answer from another question helped my getting rid of this error:
ERROR 2026 (HY000): SSL connection error: tlsv1 alert unknown caI created an Ubuntu 18.04.3 Certificate Authority. Verified everything about it. Root, Certificate, Key chain works.
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]> SHOW VARIABLES LIKE '%ssl%';
+---------------------+---------------------------------+
| Variable_name | Value |
+---------------------+---------------------------------+
| have_openssl | YES |
| have_ssl | YES |
| ssl_ca | /etc/mysql/ssl/ca-cert.pem |
| ssl_capath | |
| ssl_cert | /etc/mysql/ssl/mariadb-cert.pem |
| ssl_cipher | DHE-RSA-AES256-SHA |
| ssl_crl | |
| ssl_crlpath | |
| ssl_key | /etc/mysql/ssl/mariadb-key.pem |
| version_ssl_library | OpenSSL 1.1.1c 28 May 2019 |
+---------------------+---------------------------------+
mysql Ver 15.1 Distrib 10.4.8-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
Connection id: 37
Current database:
Current user: sa@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server: MariaDB
Server version: 10.4.8-MariaDB-1:10.4.8+maria~bionic mariadb.org binary distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /var/run/mysqld/mysqld.sock
Uptime: 19 hours 5 min 57 sec
Threads: 7 Questions: 66 Slow queries: 0 Opens: 31 Flush tables: 1 Open tables: 25 Queries per second avg: 0.000
--------------
MariaDB [(none)]>I followed the process online for the CA and creating the MariaDB SSL keys.
I did the my.cnf to get the keys to show up above. /etc/mysql/mariadb.cnf has the keys in it. I have the Mariadb repository installed for the updates.
Here is my.cnf:
[mysqld]
ssl = true
ssl-ca = /etc/mysql/ssl/ca-cert.pem
ssl-cert = /etc/mysql/ssl/mariadb-cert.pem
ssl-key = /etc/mysql/ssl/mariadb-key.pem
log_error=/var/log/mysql/mysql_error.log
ssl-cipher=DHE-RSA-AES256-SHA
grep -Ri ssl /etc/mysql/my.cnf
ssl = true
ssl-ca = /etc/mysql/ssl/ca-cert.pem
ssl-cert = /etc/mysql/ssl/mariadb-cert.pem
ssl-key = /etc/mysql/ssl/mariadb-key.pem
ssl-cipher=DHE-RSA-AES256-SHA
ssl-cipher entry can be removed. 
