文章目录

  • 1.环境检查
  • 2.软件包获取
  • 3.备份相关组件配置
  • 4.Openssh安装
  • 5.配置恢复
  • 6.服务检查及登录验证


1.环境检查

#检查系统版本及openssh组件版本
[root@HZLOPENSSHTEST ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@HZLOPENSSHTEST ~]# ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
[root@HZLOPENSSHTEST ~]# rpm -qa |egrep "openssh|openssl"
openssh-clients-7.4p1-21.el7.x86_64
openssl-libs-1.0.2k-19.el7.x86_64
openssl-1.0.2k-19.el7.x86_64
openssh-7.4p1-21.el7.x86_64
openssh-server-7.4p1-21.el7.x86_64

2.软件包获取

#下载openssh&openssl软件包
cd /opt/
wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.0p1.tar.gz
wget --no-check-certificate https://www.openssl.org/source/openssl-1.1.1q.tar.gz

#解压tar包
tar -zxvf openssl-1.1.1q.tar.gz
tar -zxvf openssh-9.0p1.tar.gz

3.备份相关组件配置

cp -r /etc/ssh /etc/ssh.bak
cp -r /etc/pam.d /etc/pam.d.bak
cp /usr/bin/openssl /usr/bin/openssl.bak

4.Openssh安装

#卸载openssh7.x版本
yum remove openssh
rpm -e --nodeps `rpm -qa | grep openssh`


#安装编译所需依赖包（按需安装）
yum install  gcc gcc-c++ glibc make openssl-devel openssl pam-devel zlib-devel tcp_wrappers-devel tcp_wrappers
 
 
#####安装Openssl
#编译安装
cd openssl-1.1.1q
./config --prefix=/usr
make -j 4 && make install
openssl version  
OpenSSL 1.1.1q  5 Jul 2022  #已编译为openssl 1.1.1版本


#####安装Openssh
#编译安装
cd openssh-9.0p1
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-ssl-dir=/usr 
make -j 4 && make install 
ssh -V        
OpenSSH_9.0p1, OpenSSL 1.1.1q  5 Jul 2022   #ssh版本为openssh9.0版本

5.配置恢复

#恢复为之前配置信息
cd /etc/ssh/
mv sshd_config sshd_config_20231130.bak
cp /etc/ssh.bak/sshd_config /etc/ssh/
cp /etc/pam.d.bak/sshd /etc/pam.d/



#文件权限调整
chmod 600 /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_ecdsa_key /etc/ssh/ssh_host_ed25519_key

#启动配置文件添加,添加执行权限
cp -a openssh-9.0p1/contrib/redhat/sshd.init /etc/init.d/sshd
chmod u+x /etc/init.d/sshd


#加入开机自启
chkconfig --add sshd
chkconfig sshd on
systemctl restart sshd
systemctl status  sshd

6.服务检查及登录验证

#登录验证
ssh 10.21.25.124
root@10.21.25.124's password:
Last login: Wed Nov 29 14:41:04 2023 from 10.21.25.124
/bin/bash: Permission denied    #登录异常，拒绝登录
Connection to 10.21.25.124 closed.



#检查配置是否禁用root登录，或者检查selinux
echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config  #允许root登录配置
setenforce 0    #关闭selinux
ssh 10.21.25.124   #重新登录验证
root@10.21.25.124's password:
Last login: Wed Nov 29 14:45:21 2023 from 10.21.25.124   #成功登录