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標題: security harden I [打印本頁]

作者: zhaoxu6679    時間: 2016-9-25 23:57
標題: security harden I
关于企业IT系统建设安全性问题在任何时候都不会成为一个过时的话题,企业在构建适合自己业务需求的IT系统之初以及整个IT系统生命周期内,系统的安全运行都是一项非常重要的工作,而作为系统运维人员更有责任为保证系统的安全、稳定的运行身体力行。
So本博文提供了关于Linux系统安全加固的具体实现脚本及基线检查规范,以供主机维护人员参考学习。
其中以下脚本主要实现的功能包括:
*加固项包括:密码长度、session超时时间、删除不用的帐号和组、限制root用户直接telnet或rlogin、ssh
*检查是否存在除root之外UID为0的用户、确保root用户的系统路径中不包含父目录,在非必要的情况下,不应包含组权限为777的目录
*检查操作系统Linux用户umask设置、检查重要目录和文件的权限、禁止除root之外的用户su操作、查找系统中任何人都有写权限的目录
*查找系统中没有属主的文件、查找系统中的隐藏文件、判断日志与审计是否合规、登录超时设置、禁用不必要的服务
*linux 安全加固适用于redhat、centos5.8至6.2
具体内容如下,请结合自身业务需求进行系统级加固:
#1、---------------------------------------------------------------------
echo "删除不用的帐号和组"
echo "delete unused users and grups"
for i in lp sync shutdown halt news uucp operator games gopher
do
echo "will delete user $i"
userdel $i
echo "user $i have delete"
done
for i in lp sync shutdown halt news uucp operator games gopher
do
echo "will delete group $i"
groupdel $i
echo "group $i have delete"
done
date=`date +%F`
#2、-----------------------------------------------
#section1 密码要求密码长度大于8,口令90天过期/etc/login.defs
#-----------------------------------------------
#---------------------------------------------------------------------
echo "cp /etc/login.defs to /etc/login.defs.bak_%date"
echo "#-------------------------------------"
cp /etc/login.defs /etc/login.defs.bak_$date
#echo "检查密码的配置"
echo "Check the configure for user's password."
echo "#-------------------------------------"
for i in PASS_MAX_DAYS PASS_MIN_LEN PASS_MIN_DAYS PASS_WARN_AGE
do
cat /etc/login.defs |grep $i|grep -v \#
done
#set password min length 8
echo "#-------------------------------------"
echo "Set user's password min length is 8"
sed  -i '/PASS_MIN_LEN/s/5/8/g' /etc/login.defs
echo "#-------------------------------------"
#set password max day 90
#echo "set password expired 90 day"
#sed  -i '/PASS_MAX_DAYS/s/99999/90/g' /etc/login.defs
#3、---------------------------------------------------------------------
echo "#检查是否存在空口令"
echo "Check if there have user without password!"
echo "#-------------------------------------"
awk -F: '($2 == "") { print $1 }' /etc/shadow
#4、-----------------------------------------------
#section2 限制root用户直接telnet或rlogin,ssh无效
######建议在/etc/securetty文件中配置:CONSOLE = /dev/tty01
#---------------------------------------------------------------------
#帐号与口令-检查是否存在除root之外UID为0的用户
#echo "#检查系统中是否存在其它id为0的用户"
echo "Check if the system have other user's id is 0"
echo "#-------------------------------------"
mesg=`awk -F: '($3 == 0) { print $1 }' /etc/passwd|grep -v root`
if [ -z $mesg ]
then
echo "There don't have other user uid=0"
else
echo
echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
echo "$mesg uid=0"
echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
fi






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