MySQL教程FG027-MySQL安装过程中的安全加固

本文档详细介绍MySQL安装过程中的安全加固措施，包括安全加固的重要性、安全威胁与防护措施、安全加固的基本原则，以及安装前的安全准备、安装过程中的安全配置、安装后的安全加固，操作系统层面、MySQL层面和网络层面的安全加固措施。风哥教程参考MySQL官方文档Security等内容。

Part01-基础概念与理论知识

1.1 安全加固的重要性

MySQL安全加固的重要性体现在以下几个方面：

数据安全：保护敏感数据不被未授权访问
系统稳定：防止恶意攻击导致系统崩溃
合规要求：满足行业法规和合规要求
业务连续性：确保业务系统的持续运行
声誉保护：避免安全事件对企业声誉的损害

1.2 安全威胁与防护措施

常见的MySQL安全威胁包括：

未授权访问：通过弱密码或默认密码访问数据库
SQL注入：通过恶意SQL语句攻击数据库
权限提升：通过漏洞提升用户权限
数据泄露：敏感数据被窃取或泄露
拒绝服务：通过恶意请求导致服务不可用

对应的防护措施：

强密码策略：使用复杂密码并定期更换
最小权限原则：只授予必要的权限
定期更新：及时更新MySQL版本和补丁
加密传输：使用SSL/TLS加密数据传输
审计日志：启用审计日志，监控异常行为

1.3 安全加固的基本原则

MySQL安全加固应遵循以下原则：

最小权限原则：只授予用户必要的权限
Defense in depth：多层防御，不要依赖单一安全措施
定期更新：及时更新MySQL版本和补丁
监控与审计：持续监控系统状态，审计异常行为
安全配置：使用安全的配置参数

Part02-生产环境规划与建议

2.1 安装前的安全准备

安装前的安全准备工作：

选择安全的MySQL版本：使用官方发布的稳定版本
准备安全的操作系统环境：安装最新的系统补丁
规划网络安全：配置防火墙规则，限制访问
准备安全的存储环境：加密存储敏感数据
制定安全策略：明确用户权限和访问控制规则

2.2 安装过程中的安全配置

安装过程中的安全配置：

设置强密码：为root用户设置复杂密码
限制root用户访问：只允许本地或特定IP访问
禁用不必要的功能：如远程root登录、匿名用户等
启用SSL/TLS：加密数据传输
配置安全参数：如密码验证插件、连接限制等

2.3 安装后的安全加固

安装后的安全加固措施：

删除默认用户和数据库：如匿名用户、test数据库
限制用户权限：只授予必要的权限
配置审计日志：记录所有用户操作
定期备份：确保数据安全
监控系统状态：及时发现异常行为

Part03-生产环境项目实施方案

3.1 操作系统层面的安全加固

操作系统层面的安全加固措施：

# 1. 安装最新的系统补丁
yum update -y

[root@fgedu.net.cn ~]# yum update -y
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
–> Running transaction check
—> Package bash.x86_64 0:4.2.46-34.el7 will be updated
—> Package bash.x86_64 0:4.2.46-35.el7 will be an update
—> Package openssl.x86_64 1:1.0.2k-19.el7 will be updated
—> Package openssl.x86_64 1:1.0.2k-21.el7 will be an update
…
Complete!

# 2. 配置防火墙规则
firewall-cmd –permanent –add-port=3306/tcp
firewall-cmd –permanent –add-source=192.168.1.0/24
firewall-cmd –reload

[root@fgedu.net.cn ~]# firewall-cmd –permanent –add-port=3306/tcp
success
[root@fgedu.net.cn ~]# firewall-cmd –permanent –add-source=192.168.1.0/24
success
[root@fgedu.net.cn ~]# firewall-cmd –reload
success

# 3. 创建专用的MySQL用户和组
useradd -r -s /sbin/nologin mysql

[root@fgedu.net.cn ~]# useradd -r -s /sbin/nologin mysql

# 4. 限制文件权限
chown -R mysql:mysql /mysql
touch /mysql/data/.mysql_secret
chmod 600 /mysql/data/.mysql_secret

[root@fgedu.net.cn ~]# chown -R mysql:mysql /mysql
[root@fgedu.net.cn ~]# touch /mysql/data/.mysql_secret
[root@fgedu.net.cn ~]# chmod 600 /mysql/data/.mysql_secret

3.2 MySQL层面的安全加固

MySQL层面的安全加固措施：

# 1. 运行安全加固脚本
mysql_secure_installation

[root@fgedu.net.cn ~]# mysql_secure_installation

Securing the MySQL server deployment.

Enter password for user root:

VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?

Press y|Y for Yes, any other key for No:
Y

There are three levels of password validation policy:

LOW Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary file

Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG:
1
Please set the password for root here.

New password:

Re-enter new password:

Estimated strength of the password: 100
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) :
Y
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL 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? (Press y|Y for Yes, any other key for No) :
Y
Success.

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? (Press y|Y for Yes, any other key for No) :
Y
Success.

By default, MySQL 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? (Press y|Y for Yes, any other key for No) :
Y
– Dropping test database…
Success.
– Removing privileges on test database…
Success.

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

Reload privilege tables now? (Press y|Y for Yes, any other key for No) :
Y
Success.

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

# 2. 创建普通用户并授予最小权限
mysql -u root -p -e “CREATE USER ‘fgedu’@’localhost’ IDENTIFIED BY ‘StrongPassword123!’;”
mysql -u root -p -e “GRANT SELECT, INSERT, UPDATE, DELETE ON fgedudb.* TO ‘fgedu’@’localhost’;”
mysql -u root -p -e “FLUSH PRIVILEGES;”

Enter password:
Enter password:
Enter password:

# 3. 配置MySQL安全参数
vi /etc/my.cnf
# 添加以下配置
[mysqld]
# 安全配置
skip-networking=0
bind-address=127.0.0.1
max_connections=100
max_connect_errors=10
# 密码策略
validate_password_policy=1
validate_password_length=8
# 审计日志
general_log=1
general_log_file=/mysql/logs/general.log
slow_query_log=1
slow_query_log_file=/mysql/logs/slow.log
long_query_time=2
# SSL配置
ssl-ca=/mysql/ssl/ca.pem
ssl-cert=/mysql/ssl/server-cert.pem
ssl-key=/mysql/ssl/server-key.pem

[root@fgedu.net.cn ~]# vi /etc/my.cnf

3.3 网络层面的安全加固

网络层面的安全加固措施：

# 1. 配置SSL/TLS
# 生成SSL证书
mkdir -p /mysql/ssl
cd /mysql/ssl
openssl genrsa 2048 > ca-key.pem
openssl req -new -x509 -nodes -days 3650 -key ca-key.pem > ca.pem
openssl req -newkey rsa:2048 -days 3650 -nodes -keyout server-key.pem > server-req.pem
openssl x509 -req -in server-req.pem -days 3650 -CA ca.pem -CAkey ca-key.pem -set_serial 01 > server-cert.pem
openssl req -newkey rsa:2048 -days 3650 -nodes -keyout client-key.pem > client-req.pem
openssl x509 -req -in client-req.pem -days 3650 -CA ca.pem -CAkey ca-key.pem -set_serial 02 > client-cert.pem
chmod 600 *.pem
chown mysql:mysql *.pem

[root@fgedu.net.cn ~]# mkdir -p /mysql/ssl
[root@fgedu.net.cn ~]# cd /mysql/ssl
[root@fgedu.net.cn ssl]# openssl genrsa 2048 > ca-key.pem
Generating RSA private key, 2048 bit long modulus
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