MariaDB : SSL/TLS の設定2019/08/02

	MariaDB で SSL/TLS による暗号化通信の設定を有効にします。
[1]	こちらを参考に SSL 証明書を取得しておきます。
[2]	作成した証明書をコピーして SSL/TLS の設定をします。

# 取得した証明書をコピーして証明書キーのフォーマット変換

root@www:~#

mkdir /var/lib/mysql/pki

root@www:~#

cp /etc/letsencrypt/live/www.srv.world/* /var/lib/mysql/pki/

root@www:~#

openssl rsa -in /var/lib/mysql/pki/privkey.pem -out /var/lib/mysql/pki/priv.key

root@www:~#

chown -R mysql. /var/lib/mysql/pki

root@www:~#

vi /etc/mysql/mariadb.conf.d/50-server.cnf

# 88-90行目：コメント解除して変更

ssl-ca =

/var/lib/mysql/pki/chain.pem

ssl-cert =

/var/lib/mysql/pki/cert.pem

ssl-key =

/var/lib/mysql/pki/priv.key

root@www:~#

systemctl restart mariadb

# 設定確認

root@www:~#

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 11
Server version: 10.3.15-MariaDB-1 Debian 10

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

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

# 以下のように表示されればOK
MariaDB [(none)]> show variables like '%ssl%'; 
+---------------------+------------------------------+
| Variable_name       | Value                        |
+---------------------+------------------------------+
| have_openssl        | NO                           |
| have_ssl            | YES                          |
| ssl_ca              | /var/lib/mysql/pki/chain.pem |
| ssl_capath          |                              |
| ssl_cert            | /var/lib/mysql/pki/cert.pem  |
| ssl_cipher          |                              |
| ssl_crl             |                              |
| ssl_crlpath         |                              |
| ssl_key             | /var/lib/mysql/pki/priv.key  |
| version_ssl_library | YaSSL 2.4.4                  |
+---------------------+------------------------------+
10 rows in set (0.004 sec)

[3]	ローカルホストで SSL/TLS 接続する場合は証明書を指定して接続します。

root@www:~#

vi /etc/mysql/mariadb.conf.d/50-mysql-clients.cnf

[mysql]

# [mysql] セクション内に追記

ssl-cert=/var/lib/mysql/pki/cert.pem
ssl-key=/var/lib/mysql/pki/priv.key

root@www:~#

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 12
Server version: 10.3.15-MariaDB-1 Debian 10

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

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

# 接続状況確認
MariaDB [(none)]> show status like 'ssl_cipher'; 
+---------------+--------------------+
| Variable_name | Value              |
+---------------+--------------------+
| Ssl_cipher    | DHE-RSA-AES256-SHA |
+---------------+--------------------+
1 row in set (0.002 sec)

MariaDB [(none)]> exit 
Bye

# 非暗号化通信の場合

root@www:~#

mysql -u root -p --ssl=false

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 13
Server version: 10.3.15-MariaDB-1 Debian 10

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

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

# 値はブランク
MariaDB [(none)]> show status like 'ssl_cipher'; 
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Ssl_cipher    |       |
+---------------+-------+
1 row in set (0.002 sec)

[4]	ユーザーに対して SSL/TLS アクセスを必須にする場合は、以下のように設定します。

root@www:~#

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 14
Server version: 10.3.15-MariaDB-1 Debian 10

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

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

# ユーザーを新規作成
MariaDB [(none)]> create user debian identified by 'password'; 
Query OK, 0 rows affected (0.00 sec)

# ユーザーを SSL/TLS 必須にする
MariaDB [(none)]> grant usage on *.* to 'debian'@'%' require ssl; 
Query OK, 0 rows affected (0.00 sec)

# SSL/TLS 必須ユーザーは ssl_type が ANY
MariaDB [(none)]> select user,host,ssl_type from mysql.user; 
+----------+-----------+----------+
| user     | host      | ssl_type |
+----------+-----------+----------+
| root     | localhost |          |
| buster   | localhost |          |
| debian   | %         | ANY      |
+----------+-----------+----------+
3 rows in set (0.002 sec)