一、环境

centos7.9,升级openssh到8.8p1最新版本

 

 

 

 二、下载升级包

# openssl和zlib为相关依赖

wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.8p1.tar.gz

wget https://www.openssl.org/source/openssl-1.1.1j.tar.gz

wget http://www.zlib.net/zlib-1.2.11.tar.gz

 

三、编译安装

1、确认安装了gcc编译环境

 

# yum install -y gcc gcc-c++（yum安装gcc编译环境）

 

2、编译安装zlib

# tar -zxvf zlib-1.2.11.tar.gz

# cd zlib-1.2.11

# ./configure --prefix=/usr/local/zlib

# make && make install

新建并编辑配置文件

vim /etc/ld.so.conf.d/zlib.conf

添加如下内容后保存退出

/usr/local/zlib/lib

.刷新

ldconfig -v

3、编译安装openssl

# tar -zxvf openssl-1.1.1j.tar.gz

# cd openssl-1.1.1j

# ./config --prefix=/usr/local/ssl -d shared

# make && make install

# echo '/usr/local/ssl/lib' >> /etc/ld.so.conf

# ldconfig -v

# /usr/local/ssl/bin/openssl version -a

 

4、编译安装openssh

# tar -zxvf openssh-8.8p1.tar.gz

# cd openssh-8.8p1

# ./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl

# make && make install

 

四、配置文件备份和修改

# sshd_config文件修改

echo 'PermitRootLogin yes' >>/usr/local/openssh/etc/sshd_config

echo 'PubkeyAuthentication yes' >>/usr/local/openssh/etc/sshd_config

echo 'PasswordAuthentication yes' >>/usr/local/openssh/etc/sshd_config

# 备份原有文件，并将新的配置复制到指定目录

mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak

cp /usr/local/openssh/etc/sshd_config /etc/ssh/sshd_config

mv /usr/sbin/sshd /usr/sbin/sshd.bak

cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd

mv /usr/bin/ssh /usr/bin/ssh.bak

cp /usr/local/openssh/bin/ssh /usr/bin/ssh

mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen.bak

cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen

mv /etc/ssh/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub.bak

cp /usr/local/openssh/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub

 

# 修改systemd参数（去掉Type或改为Type=simple）

vim /usr/lib/systemd/system/sshd.service

[Unit]

Description=OpenSSH server daemon

Documentation=man:sshd(8) man:sshd_config(5)

After=network.target sshd-keygen.service

Wants=sshd-keygen.service

[Service]

#Type=notify

Type=simple

EnvironmentFile=/etc/sysconfig/sshd

ExecStart=/usr/sbin/sshd -D $OPTIONS

ExecReload=/bin/kill -HUP $MAINPID

KillMode=process

Restart=on-failure

RestartSec=42s

[Install]

WantedBy=multi-user.target

 

五、重启sshd服务

[root@server1 openssh-8.8p1]# systemctl daemon-reload

[root@server1 openssh-8.8p1]# systemctl restart sshd

[root@server1 openssh-8.8p1]# systemctl status sshd

 

 六、注意

如果要修改ssh的配置文件必须得修改/usr/local/openssh/etc/sshd_config，修改/etc/ssh/sshd_config不会生效。