centos7 ssh默认为openssh7.4p1版本：
[root@localhost ~]# cat /etc/redhat-release CentOS Linux release 7.6.1810 (Core) [root@localhost ~]# [root@localhost ~]# ssh -V OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017 [root@localhost ~]#
一、安装telnet服务
1.为了防止ssh连接失败无法登录到主机，先安装一个telnet
yum install -y telnet-server xinetd
2.运行telnet服务
systemctl enable xinetd.service
systemctl enable telnet.socket
systemctl start telnet.socket
systemctl start xinetd.service
3.默认情况下，系统是不允许root用户telnet远程登录的。如果要使用root用户直接登录，需设置如下内容:
echo -e 'pts/0 pts/1 pts/2 pts/3' >>/etc/securetty
4.重启telnet服务
systemctl restart xinetd.service
5.测试
可以停止sshd服务或者杀掉sshd进程，远程终端将无法连接主机，可以使用telnet ip连接，则配置成功.
systemctl stop sshd.service
telnet ip
也可以使用xshell连接，修改协议为telnet，端口改为23端口,如图配置.
二、安装依赖包
1.切换到telnet方式登录，以后的操作都在telnet终端下操作，防止ssh连接意外中断造成升级失败.
2.升级需要几个组件，有些是和编译相关的等
# yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel
3.安装pam和zlib等.
# yum install -y pam* zlib*
三、下载openssh包和openssl的包
openssh下载地址：
https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/
openssl下载地址：
https://ftp.openssl.org/source/
此处我下载的是新的版本，分别是：
openssh-8.0p1.tar.gz
openssl-1.0.2r.tar.gz
四、开始安装 openssl：
1.开始安装openssl，把安装包上传至/root/soft目录下,并解压.
[root@localhost soft]# tar xfz openssl-1.0.2r.tar.gz
现在是系统默认的版本，等会升级完毕对比下
[root@localhost soft]# openssl version OpenSSL 1.0.2k-fips 26 Jan 2017
2.备份下面2个文件或目录（如果存在的话就执行）
[root@localhost soft]# ll /usr/bin/openssl -rwxr-xr-x. 1 root root 555288 Aug 9 09:38 /usr/bin/openssl [root@localhost soft]# [root@localhost soft]# mv /usr/bin/openssl /usr/bin/openssl_bak [root@localhost soft]# [root@localhost soft]# ll /usr/include/openssl total 1864 -rw-r--r--. 1 root root 6146 Aug 9 09:38 aes.h -rw-r--r--. 1 root root 63204 Aug 9 09:38 asn1.h -rw-r--r--. 1 root root 24435 Aug 9 09:38 asn1_mac.h -rw-r--r--. 1 root root 34475 Aug 9 09:38 asn1t.h ... [root@localhost soft]# [root@localhost soft]# mv /usr/include/openssl /usr/include/openssl_bak [root@localhost soft]#
3.编译安装新版本的openssl
[root@localhost soft]# cd openssl-1.0.2r [root@localhost openssl-1.0.2r]# ./config shared && make && make install 以上命令执行完毕，echo $?查看下最后的make install是否有报错，0表示没有问题 [root@localhost openssl-1.0.2r]# echo $? 0 [root@localhost openssl-1.0.2r]#
4.下面2个文件或者目录做软链接
[root@localhost openssl-1.0.2r]# ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl [root@localhost openssl-1.0.2r]# ln -s /usr/local/ssl/include/openssl /usr/include/openssl [root@localhost openssl-1.0.2r]# ll /usr/bin/openssl lrwxrwxrwx. 1 root root 26 Oct 31 23:14 /usr/bin/openssl -> /usr/local/ssl/bin/openssl [root@localhost openssl-1.0.2r]# ll /usr/include/openssl -ld lrwxrwxrwx. 1 root root 30 Oct 31 23:14 /usr/include/openssl -> /usr/local/ssl/include/openssl [root@localhost openssl-1.0.2r]#
5.命令行执行下面2个命令加载新配置
[root@localhost openssl-1.0.2r]# echo "/usr/local/ssl/lib" >> /etc/ld.so.conf [root@localhost openssl-1.0.2r]# /sbin/ldconfig
6.查看确认版本，没问题
[root@localhost openssl-1.0.2r]# openssl version OpenSSL 1.0.2r 26 Feb 2019
五、安装openssh
1.上传并解压openssh
[root@localhost soft]# tar xfz openssh-8.0p1.tar.gz [root@localhost soft]# cd openssh-8.0p1 [root@localhost openssh-8.0p1]# chown -R root.root /root/soft/openssh-8.0p1
2.命令行删除原先ssh的配置文件和目录,然后配置、编译、安装
[root@localhost openssh-8.0p1]# rm -rf /etc/ssh/* [root@localhost openssh-8.0p1]# ./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-openssl-includes=/usr/local/ssl/include --with-ssl-dir=/usr/local/ssl --with-zlib --with-md5-passwords --with-pam && make && make install [root@localhost openssh-8.0p1]# echo $? 0 [root@localhost openssh-8.0p1]#
3.安装完成后，需要对配置进行修改，不然可能会遇到root登录不上去的情况.最终添加如下两个内容，其他的不要动
[root@localhost ~]# grep "^PermitRootLogin" /etc/ssh/sshd_config PermitRootLogin yes [root@localhost ~]# grep "UseDNS" /etc/ssh/sshd_config UseDNS no [root@localhost ~]#
4.从原先的解压的包中拷贝一些文件到目标位置（如果目标目录存在就覆盖）
[root@localhost openssh-8.0p1]# cp -a contrib/redhat/sshd.init /etc/init.d/sshd [root@localhost openssh-8.0p1]# cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam [root@localhost openssh-8.0p1]# chmod +x /etc/init.d/sshd [root@localhost openssh-8.0p1]# chkconfig --add sshd [root@localhost openssh-8.0p1]# systemctl enable sshd #把原先的systemd管理的sshd文件删除或者移走或者删除，不移走的话影响我们重启sshd服务 [root@localhost openssh-8.0p1]# mv /usr/lib/systemd/system/sshd.service /tmp/
5.设置sshd服务开机启动
[root@localhost openssh-8.0p1]# chkconfig sshd on Note: Forwarding request to 'systemctl enable sshd.socket'. Created symlink from /etc/systemd/system/sockets.target.wants/sshd.socket to /usr/lib/systemd/system/sshd.socket. [root@localhost openssh-8.0p1]# systemctl restart sshd.service [root@localhost openssh-8.0p1]# netstat -lntp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd tcp 0 0 0.0.0.0:20048 0.0.0.0:* LISTEN 6139/rpc.mountd tcp 0 0 0.0.0.0:41811 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1869/sshd tcp 0 0 0.0.0.0:46303 0.0.0.0:* LISTEN 6108/rpc.statd tcp 0 0 0.0.0.0:2049 0.0.0.0:* LISTEN - [root@localhost openssh-8.0p1]#
6.测试版本.都正常
[root@localhost openssh-8.0p1]# ssh -V OpenSSH_8.0p1, OpenSSL 1.0.2r 26 Feb 2019
7.测试没问题后可以把telnet服务关闭了
[root@localhost ~]# systemctl disable xinetd.service [root@localhost ~]# systemctl stop xinetd.service [root@localhost ~]# systemctl disable telnet.socket Removed symlink /etc/systemd/system/sockets.target.wants/telnet.socket. [root@localhost ~]# systemctl stop telnet.socket [root@localhost ~]# netstat -lntp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd tcp6 0 0 :::3306 :::* LISTEN 3798/mysqld tcp6 0 0 :::111 :::* LISTEN 1/systemd tcp6 0 0 :::22 :::* LISTEN 1/systemd [root@localhost ~]#
一键脚本安装如下:
#!/bin/bash # script openssh-update.sh # Check if user is root if [ $(id -u) != "0" ]; then echo "Error: You must be root to run this script!!" exit 1 fi #下载安装包： openssh="openssh-8.0p1" openssl="openssl-1.0.2r" #Download the installation package if [ ! -f ${openssh}.tar.gz ] then wget -c https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/${openssh}.tar.gz else echo 'Skipping: openssh already downloaded' fi if [ ! -f ${openssl}.tar.gz ] then wget -c wget https://ftp.openssl.org/source/old/1.0.2/${openssl}.tar.gz else echo 'Skipping: openssl already downloaded' fi # dir=$(cd $(dirname "$0");pwd) #安装依赖包 yum install -y telnet-server xinetd yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel yum install -y pam* zlib* systemctl enable xinetd.service systemctl enable telnet.socket systemctl start telnet.socket systemctl start xinetd.service echo -e 'pts/0 pts/1 pts/2 pts/3' >>/etc/securetty systemctl restart xinetd.service echo "telnet 启动成功" sleep 3 echo "########################################################" tar xfz openssl-1.0.2r.tar.gz echo "备份OpenSSL..." mv /usr/bin/openssl /usr/bin/openssl_bak mv /usr/include/openssl /usr/include/openssl_bak echo "开始安装OpenSSL..." sleep 3 cd openssl-1.0.2r ./config shared && make && make install [ $? -eq 0 ] && echo "openssl安装成功..." ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl ln -s /usr/local/ssl/include/openssl /usr/include/openssl echo "加载动态库..." echo "/usr/local/ssl/lib" >> /etc/ld.so.conf /sbin/ldconfig echo "查看确认版本。。。" openssl version echo "OpenSSL 升级完成..." echo "开始升级OPENSSH。。。。。" sleep 5 cd $dir /usr/bin/tar -zxvf openssh-8.0p1.tar.gz cd openssh-8.0p1 chown -R root.root openssh-8.0p1 ./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-openssl-includes=/usr/local/ssl/include --with-ssl-dir=/usr/local/ssl --with-zlib --with-md5-passwords --with-pam && make && make install [ $? -eq 0] && echo "openssh 升级成功..." cp -a contrib/redhat/sshd.init /etc/init.d/sshd cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam chmod +x /etc/init.d/sshd systemctl enable sshd #[ $? -eq 0] && echo "sshd服务添加为启动项 ..." mv /usr/lib/systemd/system/sshd.service /tmp/ systemctl restart sshd.service netstat -lntp echo "查看SSH版本信息。。。" ssh -V sleep 3 echo "telnet服务关闭..." systemctl disable xinetd.service systemctl stop xinetd.service systemctl disable telnet.socket systemctl stop telnet.socket echo "所有服务升级完成，进行堡垒机连接测试..." sleep 3 exit
#!/bin/bash # Check if user is root if [ $(id -u) != "0" ]; then echo "Error: You must be root to run this script!!" exit 1 fi #下载安装包： openssh="openssh-8.0p1" openssl="openssl-1.0.2r" #Download the installation package if [ ! -f ${openssh}.tar.gz ] then wget -c https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/${openssh}.tar.gz else echo 'Skipping: openssh already downloaded' fi if [ ! -f ${openssl}.tar.gz ] then wget -c wget https://ftp.openssl.org/source/old/1.0.2/${openssl}.tar.gz else echo 'Skipping: openssl already downloaded' fi # dir=$(cd $(dirname "$0");pwd) #安装依赖包 yum install -y telnet-server xinetd yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel yum install -y pam* zlib* systemctl enable xinetd.service systemctl enable telnet.socket systemctl start telnet.socket systemctl start xinetd.service echo -e 'pts/0 pts/1 pts/2 pts/3' >>/etc/securetty systemctl restart xinetd.service echo "telnet 启动成功" sleep 3 echo "########################################################" tar xfz openssl-1.0.2r.tar.gz echo "备份OpenSSL..." mv /usr/bin/openssl /usr/bin/openssl_bak mv /usr/include/openssl /usr/include/openssl_bak echo "开始安装OpenSSL..." sleep 3 cd openssl-1.0.2r ./config --prefix=/usr/ shared && make && make install [ $? -eq 0 ] && echo "openssl编译安装成功!!!" ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl ln -s /usr/local/ssl/include/openssl /usr/include/openssl echo "加载动态库..." echo "/usr/local/ssl/lib" >> /etc/ld.so.conf /sbin/ldconfig echo "查看确认版本。。。" openssl version echo "OpenSSL 升级完成..." echo "开始升级OPENSSH。。。。。" sleep 5 cd $dir /usr/bin/tar -zxvf openssh-8.0p1.tar.gz cd openssh-8.0p1 chown -R root.root openssh-8.0p1 rm -rf /etc/ssh/* chmod 600 /etc/ssh/ssh_host_* install -v -m755 contrib/ssh-copy-id /usr/bin install -v -m644 contrib/ssh-copy-id.1 /usr/share/man/man1 install -v -m755 -d /usr/share/doc/openssh-8.0p1 install -v -m644 INSTALL LICENCE OVERVIEW README* /usr/share/doc/openssh-8.0p1 #编译安装 ./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/ssl --with-zlib --with-md5-passwords --with-pam && make && make install [ $? -eq 0 ] && echo "openssh 编译安装成功..." cp -a contrib/redhat/sshd.init /etc/init.d/sshd cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam #更改配置文件 echo 'UsePAM yes' >> /etc/ssh/sshd_config echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config chmod +x /etc/init.d/sshd systemctl daemon-reload systemctl enable sshd.socket systemctl enable sshd mv /usr/lib/systemd/system/sshd.service /tmp/ systemctl restart sshd.service netstat -lntp echo "查看SSH版本信息。。。" ssh -V sleep 3 echo "telnet服务关闭..." systemctl disable xinetd.service systemctl stop xinetd.service systemctl disable telnet.socket systemctl stop telnet.socket echo "所有服务升级完成，进行堡垒机连接测试..." sleep 3 exit
#!/bin/bash #date 2020/04/27 # Check if user is root if [ $(id -u) != "0" ]; then echo "Error: You must be root to run this script!!" exit 1 fi #下载安装包： openssh="openssh-8.2p1" openssl="openssl-1.1.1g" #Download the installation package if [ ! -f ${openssh}.tar.gz ] then wget -c https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/${openssh}.tar.gz else echo 'Skipping: openssh already downloaded' fi if [ ! -f ${openssl}.tar.gz ] then wget -c https://ftp.openssl.org/source/${openssl}.tar.gz else echo 'Skipping: openssl already downloaded' fi # dir=$(cd $(dirname "$0");pwd) #安装依赖包 yum install -y telnet-server xinetd yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel zlib-devel yum install -y pam* zlib* systemctl enable xinetd.service systemctl enable telnet.socket systemctl start telnet.socket systemctl start xinetd.service echo -e 'pts/0 pts/1 pts/2 pts/3' >>/etc/securetty systemctl restart xinetd.service echo "telnet 启动成功" sleep 3 echo "########################################################" tar xfz ${openssl}.tar.gz echo "备份OpenSSL..." mv /usr/bin/openssl /usr/bin/openssl_bak mv /usr/include/openssl /usr/include/openssl_bak echo "开始安装OpenSSL..." sleep 3 cd ${openssl} ./config --prefix=/usr shared && make && make install [ $? -eq 0 ] && echo "openssl安装成功..." echo "加载动态库..." echo "/usr/local/ssl/lib" >> /etc/ld.so.conf /sbin/ldconfig echo "查看确认版本。。。" openssl version echo "OpenSSL 升级完成..." echo "开始升级OPENSSH。。。。。" sleep 5 cd $dir /usr/bin/tar -zxvf ${openssh}.tar.gz cd ${openssh} chown -R root.root openssh* rm -rf /etc/ssh/* chmod 600 /etc/ssh/ssh_host_* install -v -m755 contrib/ssh-copy-id /usr/bin install -v -m644 contrib/ssh-copy-id.1 /usr/share/man/man1 install -v -m755 -d /usr/share/doc/openssh-8.2p1 install -v -m644 INSTALL LICENCE OVERVIEW README* /usr/share/doc/openssh-8.2p1 ./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/ssl --with-zlib --with-md5-passwords --with-pam && make && make install cp -a contrib/redhat/sshd.init /etc/init.d/sshd cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam #更改配置文件 echo 'UsePAM yes' >> /etc/ssh/sshd_config echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config chmod +x /etc/init.d/sshd systemctl daemon-reload systemctl enable sshd.socket systemctl enable sshd mv /usr/lib/systemd/system/sshd.service /tmp/ chkconfig sshd on systemctl restart sshd.service netstat -lntp echo "查看SSH版本信息。。。" ssh -V sleep 3 echo "telnet服务关闭..." systemctl disable xinetd.service systemctl stop xinetd.service systemctl disable telnet.socket systemctl stop telnet.socket echo "所有服务升级完成，进行堡垒机连接测试..." sleep 3 exit