1 MySQL encryption configuration
概述
本文将以CentOS 8.2和MySQL 8.0.21为例,介绍如何配置数据库加密连接。
如果MySQL主机设置为localhost,加密选项将是不可用,这种情况下,Zabbix前端和数据库之间使用socket文件连接(在Unix上)或共享内存(在Windows上),所以不能加密。
加密组合列表不限于本页列出的。还有更多组合可供选择。
先决条件
安装MySQL请参照 official repository.
有关如何使用 MySQL 存储库的详细信息 请参照MySQL documentation
MySQL服务器已准备好使用自签名证书接受安全连接.
若想查看哪些用户正在使用加密连接,请运行以下查询 (Performance Schema 选项应打开):
mysql> SELECT sbt.variable_value AS tls_version, t2.variable_value AS cipher, processlist_user AS user, processlist_host AS host
FROM performance_schema.status_by_thread AS sbt
JOIN performance_schema.threads AS t ON t.thread_id = sbt.thread_id
JOIN performance_schema.status_by_thread AS t2 ON t2.thread_id = t.thread_id
WHERE sbt.variable_name = 'Ssl_version' and t2.variable_name = 'Ssl_cipher'
ORDER BY tls_version;
所需模式
MySQL 配置
当前版本数据库的加密模式已经可以开箱即用 encryption mode. 将在初始设置及启动后创建服务器端证书.
为主要组件创建用户和角色:
mysql> CREATE USER
'zbx_srv'@'%' IDENTIFIED WITH mysql_native_password BY '<strong_password>',
'zbx_web'@'%' IDENTIFIED WITH mysql_native_password BY '<strong_password>'
REQUIRE SSL
PASSWORD HISTORY 5;
mysql> CREATE ROLE 'zbx_srv_role', 'zbx_web_role';
mysql> GRANT SELECT, UPDATE, DELETE, INSERT, CREATE, DROP, ALTER, INDEX, REFERENCES ON zabbix.* TO 'zbx_srv_role';
mysql> GRANT SELECT, UPDATE, DELETE, INSERT ON zabbix.* TO 'zbx_web_role';
mysql> GRANT 'zbx_srv_role' TO 'zbx_srv'@'%';
mysql> GRANT 'zbx_web_role' TO 'zbx_web'@'%';
mysql> SET DEFAULT ROLE 'zbx_srv_role' TO 'zbx_srv'@'%';
mysql> SET DEFAULT ROLE 'zbx_web_role' TO 'zbx_web'@'%';
注意, X.509 协议不检查标识, 但会将用户设置为仅使用加密连接。配置用户的更多详细信息请参阅MySQL文档 MySQL documentation。
运行如下命令以检查连接(socket连接不能用于安全连接测试):
$ mysql -u zbx_srv -p -h 10.211.55.9 --ssl-mode=REQUIRED
检查当前状态和可用的密码套件:
mysql> status
--------------
mysql Ver 8.0.21 for Linux on x86_64 (MySQL Community Server - GPL)
Connection id: 62
Current database:
Current user: [email protected]
SSL: Cipher in use is TLS_AES_256_GCM_SHA384
mysql> SHOW SESSION STATUS LIKE 'Ssl_cipher_list'\G;
*************************** 1. row ***************************
Variable_name: Ssl_cipher_list
Value: TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256:DHE-DSS-AES128-SHA256:DHE-DSS-AES256-GCM-SHA384:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-DSS-AES128-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES256-SHA:CAMELLIA256-SHA:CAMELLIA128-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA
1 row in set (0.00 sec)
ERROR:
No query specified
前端
要为 Zabbix 前端和数据库之间的连接建立传输加密,请执行以下操作:
- 勾选 Database TLS encryption
- 取消勾选 Verify database certificate
服务端
要为服务端和数据库之间启用连接传输加密,请修改该文件 /etc/zabbix/zabbix_server.conf:
...
DBHost=10.211.55.9
DBName=zabbix
DBUser=zbx_srv
DBPassword=<strong_password>
DBTLSConnect=required
...
验证 CA 模式
将所需的MySQL CA复制到Zabbix前端服务器,分配适当的权限以允许Web服务器读取此文件。
Verify CA 模式在 SLES 12 and RHEL 7 不会生效,因为所在系统的 MySQL 库过老.
使用证书验证为 Zabbix 前端和数据库之间的连接启用加密:
- 勾选Database TLS encryption 和 Verify database certificate
- 指定数据库 TLS CA 文件的路径
或者,可以在 /etc/zabbix/web/zabbix.conf.php 配置:
...
$DB['ENCRYPTION'] = true;
$DB['KEY_FILE'] = '';
$DB['CERT_FILE'] = '';
$DB['CA_FILE'] = '/etc/ssl/mysql/ca.pem';
$DB['VERIFY_HOST'] = false;
$DB['CIPHER_LIST'] = '';
...
使用命令行工具对用户进行故障排除,以检查所需用户是否可以连接:
$ mysql -u zbx_web -p -h 10.211.55.9 --ssl-mode=REQUIRED --ssl-ca=/var/lib/mysql/ca.pem
服务端
要为Zabbix服务器和数据库之间的连接启用加密和证书验证,请配置 /etc/zabbix/zabbix_server.conf:
...
DBHost=10.211.55.9
DBName=zabbix
DBUser=zbx_srv
DBPassword=<strong_password>
DBTLSConnect=verify_ca
DBTLSCAFile=/etc/ssl/mysql/ca.pem
...
验证完整模式
MySQL 配置
MySQL CE 请参考如下配置 (/etc/my.cnf.d/server-tls.cnf) :
[mysqld]
...
# in this examples keys are located in the MySQL CE datadir directory
ssl_ca=ca.pem
ssl_cert=server-cert.pem
ssl_key=server-key.pem
require_secure_transport=ON
tls_version=TLSv1.3
...
MySQL CE服务器和客户端(Zabbix前端)的密钥应根据MySQl CE文档手动创建:Creating SSL and RSA certificates and keys using MySQL or Creating SSL certificates and keys using openssl
MySQL服务器证书应设置为包含FQDN的名称,因为Zabbix前端将使用域名与数据库或数据库主机的IP地址进行通信。
创建MySQL用户:
mysql> CREATE USER
'zbx_srv'@'%' IDENTIFIED WITH mysql_native_password BY '<strong_password>',
'zbx_web'@'%' IDENTIFIED WITH mysql_native_password BY '<strong_password>'
REQUIRE X509
PASSWORD HISTORY 5;
检查是否可使用该用户登录:
$ mysql -u zbx_web -p -h 10.211.55.9 --ssl-mode=VERIFY_IDENTITY --ssl-ca=/var/lib/mysql/ca.pem --ssl-cert=/var/lib/mysql/client-cert.pem --ssl-key=/var/lib/mysql/client-key.pem
前端
启用加密,并对 Zabbix 前端和数据库之间的连接进行验证:
检查数据库 TLS 加密并验证数据库证书
数据库指定的 TLS 密钥文件路径
数据库指定的 TLS CA 文件路径
数据库指定的 TLS 证书文件路径
注意,MySQL 这个选项 Database host verification 是被选中的并显示为灰色.
密码列表应当为空,以便前端和服务器可以从两端支持的列表中协商出所需的密码列表。
或者可以在此配置 /etc/zabbix/web/zabbix.conf.php:
...
// Used for TLS connection with strictly defined Cipher list.
$DB['ENCRYPTION'] = true;
$DB['KEY_FILE'] = '/etc/ssl/mysql/client-key.pem';
$DB['CERT_FILE'] = '/etc/ssl/mysql/client-cert.pem';
$DB['CA_FILE'] = '/etc/ssl/mysql/ca.pem';
$DB['VERIFY_HOST'] = true;
$DB['CIPHER_LIST'] = 'TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-GC';
...
// 或
...
// Used for TLS connection without Cipher list defined - selected by MySQL server
$DB['ENCRYPTION'] = true;
$DB['KEY_FILE'] = '/etc/ssl/mysql/client-key.pem';
$DB['CERT_FILE'] = '/etc/ssl/mysql/client-cert.pem';
$DB['CA_FILE'] = '/etc/ssl/mysql/ca.pem';
$DB['VERIFY_HOST'] = true;
$DB['CIPHER_LIST'] = '';
...
服务端
要为Zabbix服务端和数据库之间启用加密连接并进行完全验证,请配置 /etc/zabbix/zabbix_server.conf:
...
DBHost=10.211.55.9
DBName=zabbix
DBUser=zbx_srv
DBPassword=<strong_password>
DBTLSConnect=verify_full
DBTLSCAFile=/etc/ssl/mysql/ca.pem
DBTLSCertFile=/etc/ssl/mysql/client-cert.pem
DBTLSKeyFile=/etc/ssl/mysql/client-key.pem
...