概述

由于安全漏洞扫描显示OpenSSH版本过低需升级至最新版,故编写该文档。

查看服务器基本信息

[root@localhost ~]# ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
[root@localhost ~]# cat /etc/redhat-release 
CentOS Linux release 7.8.2003 (Core)

安装升级依赖

[root@localhost ~]# yum -y install wget gcc zlib-devel openssl-devel pam-devel libselinux-devel

升级OPENSSL

备份旧版openssl
[root@localhost ~]# mv /usr/bin/openssl{,.bak}
[root@localhost ~]# mv /usr/include/openssl{,.bak}
解压并编译安装
[root@localhost ~]# wget https://www.openssl.org/source/openssl-1.1.1k.tar.gz
[root@localhost ~]# tar zxf openssl-1.1.1k.tar.gz -C /usr/local/
[root@localhost ~]# cd /usr/local/openssl-1.1.1k/
[root@localhost openssl-1.1.1k]# ./config --prefix=/usr/local/openssl
[root@localhost openssl-1.1.1k]# make -j 2 && make install
配置调整
[root@localhost openssl-1.1.1k]# ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl
[root@localhost openssl-1.1.1k]# ln -s /usr/local/openssl/include/openssl /usr/include/openssl
[root@localhost openssl-1.1.1k]# echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
[root@localhost openssl-1.1.1k]# ldconfig -v
验证版本
[root@localhost openssl-1.1.1k]# openssl version
OpenSSL 1.1.1k  25 Mar 2021

升级OPENSSH

停止原有服务及备份数据
[root@localhost ~]# systemctl stop sshd
[root@localhost ~]# mv /etc/ssh{,.bak}
[root@localhost ~]# mv /etc/pam.d/sshd{,.bak}
卸载原有openssh包
[root@localhost ~]# rpm -e --nodeps `rpm -qa | grep openssh`
下载并解压安装包
[root@localhost ~]# wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.6p1.tar.gz
[root@localhost ~]# tar zxf openssh-8.6p1.tar.gz 
[root@localhost ~]# cd openssh-8.6p1
编译安装
[root@localhost openssh-8.6p1]# ./configure --prefix=/usr --sysconfdir=/etc/ssh --with-md5-passwords --with-pam --with-zlib --with-tcp-wrappers --with-ssl-dir=/usr/local/openssl --without-hardening
[root@localhost openssh-8.6p1]# make -j 2 && make install
拷贝配置文件并启动
[root@localhost openssh-8.6p1]# cp contrib/redhat/sshd.init /etc/init.d/sshd
[root@localhost openssh-8.6p1]# mv /etc/pam.d/sshd.bak /etc/pam.d/sshd
[root@localhost openssh-8.6p1]# mv /etc/ssh /etc/ssh_update.bak
[root@localhost openssh-8.6p1]# mv /etc/ssh.bak /etc/ssh
[root@localhost openssh-8.6p1]# chmod 600 /etc/ssh/*key
[root@localhost openssh-8.6p1]# chkconfig --add sshd
[root@localhost openssh-8.6p1]# chkconfig sshd on
[root@localhost openssh-8.6p1]# systemctl restart sshd
允许Root登陆
[root@localhost ~]# sed -i 's/^#\(PermitRootLogin \).*/\1yes/' /etc/ssh/sshd_config
版本验证
[root@localhost openssh-8.6p1]# ssh -V
OpenSSH_8.6p1, OpenSSL 1.1.1k  25 Mar 2021

遇到的问题

Job for sshd.service failed because the control process exited with error code. See "systemctl status sshd.service" and "journalctl -xe" for details.

解决办法

grep sshd /var/log/audit/audit.log | audit2allow -M mypol
semodule -i mypol.pp

分类: Linux