引言

在当今的信息时代，系统安全已经成为企业和个人用户关注的焦点。CentOS 7作为一款流行的Linux操作系统，其安全加固尤为重要。通过编写Shell脚本，我们可以自动化地进行系统安全加固，提高系统的安全性。本文将详细介绍CentOS 7系统安全加固的实战Shell脚本示例，帮助读者深入了解系统安全加固的要点。

一、系统账户安全加固

1. 禁止root用户登录

# 禁止root用户通过SSH登录
sed -i '/^PermitRootLogin/s/^.*$/no/' /etc/ssh/sshd_config
systemctl restart sshd

# 禁止root用户登录命令行
echo "禁止root用户登录命令行" >> /etc/login.defs

2. 创建普通用户

# 创建用户
useradd -m -s /bin/bash username

# 设置用户密码
echo "username:password" | chpasswd

# 设置用户权限
usermod -aG wheel username

二、系统文件安全加固

1. 限制用户可执行文件

”`bash

创建一个白名单文件

cat > /etc/sudoers.d/exec_white << EOF Defaults !env_reset Defaults !requiretty Defaults !visible_commands Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix / Defaults !exec_prefix