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MariaDB : SSL/TLS の設定
2019/05/13
 
MariaDB で SSL/TLS による暗号化通信の設定を有効にします。
[1]
[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

[root@www ~]#
mkdir /var/lib/mysql/pki

[root@www ~]#
cp /etc/letsencrypt/live/www.srv.world/* /var/lib/mysql/pki/

[root@www ~]#
chown -R mysql. /var/lib/mysql/pki
[root@www ~]#
vi /etc/my.cnf.d/mariadb-server.cnf
# [mysqld] セクション内に追記

[mysqld]
ssl-ca=/var/lib/mysql/pki/chain.pem
ssl-cert=/var/lib/mysql/pki/cert.pem
ssl-key=/var/lib/mysql/pki/privkey.pem
[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 8
Server version: 10.3.12-MariaDB MariaDB Server

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        | YES                              |
| 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/privkey.pem   |
| version_ssl_library | OpenSSL 1.1.1b FIPS  26 Feb 2019 |
+---------------------+----------------------------------+
10 rows in set (0.002 sec)
[3] SSL/TLS で接続する場合は証明書を指定して接続します。
[root@www ~]#
mysql -u root -p --ssl-ca=/var/lib/mysql/pki/cert.pem

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 9
Server version: 10.3.12-MariaDB MariaDB Server

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    | TLS_AES_256_GCM_SHA384 |
+---------------+------------------------+
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

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 10.3.12-MariaDB MariaDB Server

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 10
Server version: 10.3.12-MariaDB MariaDB Server

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

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

# SSL/TLS 必須ユーザーを新規作成
MariaDB [(none)]> create user redhat identified by 'password' 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 |          |
| root   | 127.0.0.1 |          |
| root   | ::1       |          |
| redhat | %         | ANY      |
| fedora | %         |          |
+--------+-----------+----------+
5 rows in set (0.00 sec)

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

MariaDB [(none)]> select user,host,ssl_type from mysql.user; 
+--------+-----------+----------+
| user   | host      | ssl_type |
+--------+-----------+----------+
| root   | localhost |          |
| root   | 127.0.0.1 |          |
| root   | ::1       |          |
| redhat | %         | ANY      |
| fedora | %         | ANY      |
+--------+-----------+----------+
5 rows in set (0.00 sec)
[5] 他ホストから SSL/TLS アクセスする場合は、アクセス元のホストに証明書をコピーしておいて、それを指定して接続すれば OK です。
[root@node01 ~]#
mysql -h www.srv.world -u fedora -p --ssl-ca=/root/cert.pem

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 10.3.12-MariaDB MariaDB Server

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 [(none)]> show status like 'ssl_cipher'; 
+---------------+------------------------+
| Variable_name | Value                  |
+---------------+------------------------+
| Ssl_cipher    | TLS_AES_256_GCM_SHA384 |
+---------------+------------------------+
1 row in set (0.002 sec)
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