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Linux 平安设置脚本，局部配置按需批改
#!/bin/bash
# Filename: security_setting.sh
# Author: Jeff.Cui
# Date: 2023-05-22
############### 平安设置次要批改性能 ###############
# 批改禁止 root ssh 登录，如只有 root 用户，则增加用户：dbaadmin/DBA_Test1 用户；# 批改 ssh 端口为 922；# 批改明码最大可用工夫 180 天，起码 8 位大写字母、小写字母、数字、特殊字符；# 批改限度 IP 网段拜访，hosts.allow 和 firewalld
# 批改超时限度 1800s；# 红字、高亮
RGB_DANGER() {echo -e "\n\033[31;1m# $1 \033[0m\n"}
# 白字、半亮
RGB_WAIT() {echo -e "\n\033[37;2m# $1 \033[0m\n"}
# 绿字、高亮
RGB_SUCCESS() {echo -e "\n\033[32;1m# $1 \033[0m\n"}
# 黄字、半亮
RGB_WARNING() {echo -e "\n\033[33;2m# $1 \033[0m\n"}
# 天蓝字、半亮
RGB_INFO() {echo -e "\n\033[36;2m# $1 \033[0m"}
# 查看操作系统大版本，如 6 /7/8
CHECK_VER=$(egrep "^VERSION_ID" /etc/os-release | cut -d\" -f2 | cut -d\. -f1)
# 查看 RAM 大小，此处未应用
CHECK_RAM=$(cat /proc/meminfo | grep "MemTotal" | awk -F""'{ram=$2/1024/1024}{printf("%.0f",ram)}')
# 设置日志名字，脚本同目录下
conflog=linux_security_$(date +'%Y%m%d').log
# 查看 kernel 版本，用以同 4.9 比拟大小，BBR 要求 4.9 及以上版本
KERN=$(uname -r | awk -F. '{ printf("%d.%d\n",$1,$2); }')
kern_int=$(echo $KERN|cut -d\. -f1)
kern_dec=$(echo $KERN|cut -d\. -f2)
if [$kern_int -gt 4];then
cansue_bbr = "Y"
elif [$kern_int -eq 4] && [$kern_dec -ge 9];then
cansue_bbr = "Y"
fi
# 查看是否 root 执行
check_root() {if [[ $EUID -ne 0]]; then
RGB_DANGER "This script must be run as root!"
exit 1
fi
}
# 查看 OS 版本是否为 7
check_os() {if [ "${CHECK_VER}" != '7' ]; then
RGB_DANGER "This script must be run on Linux 7!"
exit 1
fi
}
# 启用 BBR，防止网络拥塞, 须要内核版本 >=4.9
open_bbr() {echo "============= bbr =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
sed -i '/default_qdisc\|BBR\|tcp_congestion_control/d' /etc/sysctl.conf
echo "# BBR" >>/etc/sysctl.conf
echo "net.core.default_qdisc=fq" >>/etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >>/etc/sysctl.conf
sysctl -p >>${conflog} 2>&1
sysctl -n net.ipv4.tcp_congestion_control >>${conflog} 2>&1
lsmod | grep bbr >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 设置禁用 SELinux
disable_selinux() {echo "============= selinux =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
seconf=$(grep -i ^selinux= /etc/selinux/config | sed 's/ //g' | cut -d\= -f2)
seconf=$(echo $seconf | tr [:upper:] [:lower:])
if ["${seconf}" != "disabled" ];then
sed -i 's/^SELINUX=.*$/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
else
RGB_INFO "SELinux already configed to'disabled',see /etc/selinux/config:$(grep -i ^selinux= /etc/selinux/config)"
fi
# systemctl disable firewalld.service >>${conflog} 2>&1
# systemctl stop firewalld.service >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 设置仅容许指定 IP 能够 ssh 登录
limit_sshIP() {
sed -i '/10.10.212.89/d' /etc/hosts.allow
echo "sshd:10.10.212.89/255.255.252.0" >>/etc/hosts.allow
sed -i '/sshd:/d' /etc/hosts.deny
echo 'sshd:ALL' /etc/hosts.deny
systemctl restart firewalld # 开启防火墙
systemctl enable firewalld # 开机自启动防火墙
firewall-cmd --zone=public --list-rich-rules
firewall-cmd --permanent --remove-service=ssh
firewall-cmd --permanent --zone=public --remove-service=ssh # 勾销没有限度的 ssh 服务，限度近程登录
firewall-cmd --permanent --add-rich-rule='rule family="ipv4"source address="192.168.56.0/23"port protocol="tcp"port="922"accept' #增加 192.168.56.0/23 网段 拜访 922 号端口白名单
firewall-cmd --permanent --add-rich-rule='rule family="ipv4"source address="10.10.212.89/22"port protocol="tcp"port="922"accept' #增加 10.10.212.89/22 网段 拜访 922 号端口白名单
firewall-cmd --reload # 失效设置
firewall-cmd --zone=public --list-rich-rules
}
# 设置时区为东八区 'Asia/Shanghai' "+0800"
time_zone() {echo "============= time zone =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
if ["$(date +%z)" != "+0800" ];then
rm -rf /etc/localtime >>${conflog} 2>&1
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime >>${conflog} 2>&1
ls -ln /etc/localtime >>${conflog} 2>&1
else
tz=$(echo "$(ls -l /etc/localtime | awk -F"/"'{print $(NF-1)"/"$NF}') ($(date +'%Z, %z'))"| sed's/^ //g')
RGB_INFO "Time Zone already set to'Asia/Shanghai', like $tz,see /etc/localtime"
fi
RGB_SUCCESS "Configuration Success"
}
# 可选，测试环境可用
custom_profile() {echo "============= custom profile =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
cat >/etc/profile.d/secu.sh <<EOF
PS1="\[\e[37;40m\][\[\e[31;40m\]\u\[\e[37;40m\]@\h \[\e[35;40m\]\W\[\e[37;40m\]]\\\\$ \[\e[0m\]"
GREP_OPTIONS="--color=auto"
alias l='ls -AFhlt'
alias grep='grep --color'
alias egrep='egrep --color'
alias fgrep='fgrep --color'
export HISTTIMEFORMAT="%F %T"
EOF
cat /etc/profile.d/custom.conf >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 禁用 ctrl-alt-del 重启组合键
disable_cad() {echo "============= disable cad =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
if [-h /etc/systemd/system/ctrl-alt-del.target];then
rm -rf /usr/lib/systemd/system/ctrl-alt-del.target
RGB_INFO "removed ctrl-alt-del.target link"
else
RGB_INFO "Already removed ctrl-alt-del.target link"
fi
# systemctl mask ctrl-alt-del.target >>${conflog} 2>&1 # 创立或批改软连贯指向 /dev/null
RGB_SUCCESS "Configuration Success"
}
# 锁定没有登录权限的账户
lock_user() {echo "============= Lock users =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
for account in $(egrep "/sbin/nologin" /etc/passwd | cut -f 1 -d ":"); do
passwd -l $account 2>&1 >/dev/null
done
# 如果只有 root 账户可登录零碎，则建设其余管理员账户，如：dbaadmin/DBA_Test1
if [$(egrep "/bin/bash|/bin/csh|/bin/sh" /etc/passwd | cut -f 1 -d ":" | grep -v root| wc -l) -eq 0 ];then
useradd dbaadmin -g wheel -G wheel
echo "DBA_Test1" | passwd --stdin dbaadmin
fi
# cut -d : -f 1 /etc/passwd >>${conflog} 2>&1
# for g in adm lp mail games ftp; do
# groupdel ${g} >>${conflog} 2>&1
# done
# cat /etc/group >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 系统文件权限
sys_permissions() {echo "============= sys permissions =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
chmod 644 /etc/passwd >>${conflog} 2>&1
chmod 644 /etc/group >>${conflog} 2>&1
chmod 000 /etc/shadow >>${conflog} 2>&1
chmod 000 /etc/gshadow >>${conflog} 2>&1
ls -la /etc/passwd >>${conflog} 2>&1
ls -la /etc/group >>${conflog} 2>&1
ls -la /etc/shadow >>${conflog} 2>&1
ls -la /etc/gshadow >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
#批改曾经存在的账户的明码过期工夫
exist_account_pwd_policy() {name=$(egrep "/bin/bash|/bin/csh|/bin/sh" /etc/passwd | grep -v root | awk -F ":" '{print $1}')
echo "Check exist account and change expire time for password..."
if [-n "$name"]; then
for i in $name; do
passwd -n 2 -x 180 -w 7 $i 2>&1 >/dev/null
done
printf "OK\n"
else
printf "Do not exist account,OK\n"
fi
}
# 批改默认明码策略，对后加账户失效
password_policy() {echo "============= default password policy =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
passwd_maxdays=$(grep -i ^PASS_MAX_DAYS /etc/login.defs | awk '{print $2}')
if [$passwd_maxdays -gt 180];then
cp /etc/login.defs /etc/login.defs.$(date +'%F')
sed -i 's/^PASS_MAX_DAYS.*$/PASS_MAX_DAYS 180/' /etc/login.defs
sed -i 's/^PASS_MIN_DAYS.*$/PASS_MIN_DAYS 0/' /etc/login.defs
sed -i 's/^PASS_MIN_LEN.*$/PASS_MIN_LEN 8/' /etc/login.defs
sed -i 's/^PASS_WARN_AGE.*$/PASS_WARN_AGE 7/' /etc/login.defs
else
RGB_INFO "Default Password lifetime policy already changed, do nothing"
fi
grep -Ev "^$|^#" /etc/login.defs >>${conflog} 2>&1
# 批改明码复杂度
plnum=$(grep -Ei "^minlen|^difok|^dcredit|^ucredit|^ocredit|^lcredit" /etc/security/pwquality.conf| wc -l)
if [$plnum -eq 0];then
cat >>/etc/security/pwquality.conf <<EOF # 8 位以上蕴含数字 \ 大写字母 \ 特殊字符 \ 小写字母 4 种，且同旧明码差别 3 位以上
minlen = 8
difok = 3
dcredit = -1
ucredit = -1
ocredit = -1
lcredit = -1
EOF
else
RGB_INFO "There already has policy like:\n$(grep -Ei"^minlen|^difok|^dcredit|^ucredit|^ocredit|^lcredit"/etc/security/pwquality.conf)"
fi
RGB_SUCCESS "Configuration Success"
}
# 批改 useradd 默认到期
change_useradd() {echo "============= change useradd =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
sed -i 's/^INACTIVE.*$/INACTIVE=180/' /etc/default/useradd
cat /etc/default/useradd >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 配置 ssh 策略
sec_ssh() {echo "============= ssh 平安设置（禁止 root 登录、批改 ssh 默认端口为 922）=============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
cp /etc/ssh/sshd_config /etc/ssh/sshd_config_$(date +'%F')
sed -i '/^UseDNS\|^Port\|^AllowTcpForwarding\|^X11UseLocalhost\|^X11Forwarding\|^LoginGraceTime\|^PermitEmptyPasswords\|^PubkeyAuthentication\|^MaxAuthTries\|^ClientAlive\|^PermitRootLogin/d' /etc/ssh/sshd_config
sed -i '/^#UseDNS/a\UseDNS no' /etc/ssh/sshd_config
sed -i '/^#Port/a\Port 922' /etc/ssh/sshd_config
sed -i '/^#AllowTcpForwarding/a\AllowTcpForwarding yes' /etc/ssh/sshd_config
sed -i '/^#X11UseLocalhost/a\X11UseLocalhost no' /etc/ssh/sshd_config
sed -i '/X11Forwarding/a\X11Forwarding yes' /etc/ssh/sshd_config
sed -i '/^#LoginGraceTime/a\LoginGraceTime 90' /etc/ssh/sshd_config
sed -i '/^#PermitEmptyPasswords/a\PermitEmptyPasswords no' /etc/ssh/sshd_config
sed -i '/^#PubkeyAuthentication/a\PubkeyAuthentication yes' /etc/ssh/sshd_config
sed -i '/^#MaxAuthTries/a\MaxAuthTries 5' /etc/ssh/sshd_config
sed -i '/^#ClientAliveInterval/a\ClientAliveInterval 60' /etc/ssh/sshd_config
sed -i '/^#ClientAliveCountMax/a\ClientAliveCountMax 3' /etc/ssh/sshd_config
sed -i '/^#PermitRootLogin/a\PermitRootLogin no' /etc/ssh/sshd_config
sed -i "s/#Banner none/Banner \/etc\/issue.net/g" /etc/ssh/sshd_config
echo "ATTENTION:You have logged onto a secured server, ONLY Authorized users can access..." > /etc/issue
echo "ATTENTION:You have logged onto a secured server, ONLY Authorized users can access..." > /etc/issue.net
echo "ATTENTION:You have logged onto a secured server, ONLY Authorized users can access..." > /etc/motd
systemctl restart sshd >/dev/null 2>&1
grep -Ev "^$|^#" /etc/ssh/sshd_config >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 禁用 USB 设施
dsiable_usb() {echo "============= 禁用 USB 设施 =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
echo "install usb-storage /bin/true" >/etc/modprobe.d/block_usb.conf
cat /etc/modprobe.d/block_usb.conf >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 超时设置
timeout_config() {echo "============= timeout config =============" >>${conflog} 2>&1
RGB_WAIT "Configuring..."
echo "export TMOUT=1800" >>/etc/profile.d/custom.conf
cat /etc/profile.d/custom.conf >>${conflog} 2>&1
RGB_SUCCESS "Configuration Success"
}
# 询问是否重启 OS, reboot
reboot_os() {
RGB_WARNING "Please restart the server and see if the services start up fine."
RGB_WARNING "Do you want to restart OS ? [y/n]:"
while :; do
read REBOOT_STATUS
if [[! "${REBOOT_STATUS}" =~ ^[y,n]$ ]]; then
echo -en "${RGB_DANGER}Input error, please only input'y'or'n':"
else
break
fi
done
REBOOT_STATUS=$(echo $REBOOT_STATUS | tr [:upper:] [:lower:])
["${REBOOT_STATUS}" == 'y' ] && reboot
}
# 主步骤
main() {RGB_INFO "1/13 : Customize the profile (color and alias)"
custom_profile
RGB_INFO "2/13 : Time zone adjustment，设置时区"
time_zone
RGB_INFO "3/13 : Disable selinux，禁用 SELinux"
disable_selinux
RGB_INFO "4/13 : Configure Limit IP login，限度 IP 近程拜访"
limit_sshIP
RGB_INFO "5/13 : Disable Ctrl+Alt+Del"
disable_cad
if ["$cansue_bbr" = "Y"];then
RGB_INFO "6/13 : Enable Google bbr congestion control algorithm，启用 Google BBR 防拥挤，内核版本≥4.9"
open_bbr
else
RGB_INFO "6/13 : 不反对 Google BBR 防拥挤配置，内核版本 <4.9，Not support Google bbr congestion control algorithm, do nothing..."
fi
RGB_INFO "7/13 : 锁定 (Lock) 没有登录权限的账户 ($(egrep"/sbin/nologin"/etc/passwd | cut -d: -f1 | paste -s -d","s) )"
lock_user
RGB_INFO "8/13 : System permissions for sensitive files，批改 passwd/group 等系统文件读写权限"
exist_account_pwd_policy
RGB_INFO "9/13 : System permissions for sensitive files，批改 passwd/group 等系统文件读写权限"
sys_permissions
RGB_INFO "10/13 : Modify Account Password Survival Policy，设置明码最大可用天数、最小长度等"
password_policy
RGB_INFO "11/13 : Maximum number of days an account is valid after password expiration strategy"
change_useradd
RGB_INFO "12/13 : SSH 平安设置，禁用 root 近程登录，批改默认端口为 922"
sec_ssh
RGB_INFO "13/13 : Timeout Auto-Logout Configuration, 设置 30 分钟超时退出"
timeout_config
reboot_os
}
clear
check_root
check_os
main
正文完
