CentOS7下使用开源安全审计工具Lynis

yuanfan2012

发布于 2020-11-26 11:36:17

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发布于 2020-11-26 11:36:17

文章被收录于专栏：WalkingCloudWalkingCloud

开源安全审计工具Lynis简单介绍

Lynis是一款Linux系统的安全审计以及加固工具，能够进行深层次的安全扫描，其目的是检测潜在的时间并对未来的系统加固提供建议。

这款软件会扫描一般系统信息，脆弱软件包以及潜在的错误配置,执行全面的运行状况扫描，以支持系统强化和合规性测试

官网：https://cisofy.com/lynis/

下面介绍使用Lynis扫描CentOS7系统并进行安全加固

1、配置lynis的源，并安装lynis

vi /etc/yum.repos.d/cisofy-lynis.repo
[lynis]
name=CISOfy Software - Lynis package
baseurl=https://packages.cisofy.com/community/lynis/rpm/
enabled=1
gpgkey=https://packages.cisofy.com/keys/cisofy-software-rpms-public.key
gpgcheck=1
priority=2


yum install lynis

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2、使用用lynis扫描系统

lynis -h
lynis audit system

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3、根据上面安全加固建议进行安全加固

例如扫描出来的SSH的加固建议有如下加固项

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修改之前的CentOS7安全加固脚本中ssh加固部分，可以参考之前文章

CentOS7一键安全加固及系统优化脚本

修改成如下

sec_ssh() {
    echo "============= sec ssh =============" >> ${LOCK} 2>&1
    echo -en "${RGB_WAIT}Configuring...${RGB_END}"
    sed -i 's/#UseDNS.*$/UseDNS no/' /etc/ssh/sshd_config
    sed -i 's/^#LoginGraceTime.*$/LoginGraceTime 60/' /etc/ssh/sshd_config
    sed -i 's/^#PermitEmptyPasswords.*$/PermitEmptyPasswords no/' /etc/ssh/sshd_config
    sed -i 's/^#PubkeyAuthentication.*$/PubkeyAuthentication yes/' /etc/ssh/sshd_config
    sed -i 's/^#MaxAuthTries.*$/MaxAuthTries 3/' /etc/ssh/sshd_config
    sed -i "s/#ClientAliveInterval 0/ClientAliveInterval 30/g" /etc/ssh/sshd_config
    sed -i "s/#ClientAliveCountMax 3/ClientAliveCountMax 3/g" /etc/ssh/sshd_config
    sed -i "s/X11Forwarding yes/X11Forwarding no/g" /etc/ssh/sshd_config
    sed -i "s/#AllowAgentForwarding yes/AllowAgentForwarding no/g" /etc/ssh/sshd_config
    sed -i "s/#AllowTcpForwarding yes/AllowTcpForwarding no/g" /etc/ssh/sshd_config
    sed -i "s/#TCPKeepAlive yes/TCPKeepAlive no/g" /etc/ssh/sshd_config
    sed -i "s/#Compression delayed/Compression no/g" /etc/ssh/sshd_config
    sed -i "s/#MaxSessions 10/MaxSessions 2/g" /etc/ssh/sshd_config
    sed -i "s/#LogLevel INFO/LogLevel VERBOSE/g" /etc/ssh/sshd_config
    sed -i "s/#Banner none/Banner \/etc\/issue.net/g" /etc/ssh/sshd_config
    echo "Authorized users only. All activity may be monitored and reported.">/etc/issue.net
    systemctl restart sshd.service >> ${LOCK} 2>&1
    cat /etc/ssh/sshd_config >> ${LOCK} 2>&1
    echo -e "\r${RGB_SUCCESS}Configuration Success${RGB_END}"
}

然后执行CentOS7安全加固脚本后，再进行lynis扫描