1         ssh版本检查

本文档针对于ssh版本低于7.0的系统，升级为openssh7.5 p1。

ssh –V
[[email protected] ~]# ssh -V
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010

2         OPENssh7.5安装步骤

卸载原有openssh

yum remove openssh -y

准备编译环境：

yum install gcc openssl-devel zlib-devel

上传openssh安装包到/mnt并解压进行编译：

tar zxvf openssh-7.5p1.tar.gz
cd openssh-7.5p1
./configure
make && make install

拷贝ssh服务文件

cp /usr/local/bin/ssh /usr/bin/ssh
cp /usr/local/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub
cp /mnt/openssh-7.5p1/contrib/redhat/sshd.init /etc/init.d/sshd
cp ./contrib/redhat/sshd.init /etc/init.d/sshd

修改配置文件

修改/etc/ssh/sshd_config

将#PermitRootLogin修改为PermitRootLogin yes

修改/usr/libexec/sftp-server为/usr/local/libexec/sftp-server

修改 /etc/init.d/sshd

将SSHD=/usr/sbin/sshd 改为 SSHD=/usr/local/sbin/sshd

将/usr/sbin/ssh-keygen -A 改为 /usr/local/bin/ssh-keygen -A

在 ‘$SSHD $OPTIONS && success || failure’这一行上面加上一行 ‘OPTIONS="-f /etc/ssh/sshd_config"’

加入系统服务

chkconfig --add sshd
chkconfig sshd on

检查服务

chkconfig --list |grep sshd
sshd               0:off    1:off    2:on    3:on    4:on    5:on    6:off

启动服务

service sshd start

检查ssh版本

[[email protected] ~]# ssh -V
OpenSSH_7.5p1, OpenSSL 1.0.1e-fips 11 Feb 2013

3         OPENssh升级脚本

根据以上升级过程编写了脚本自动执行操作，脚本内容如下：

#!/bin/bash
sshInst()
{
       yum remove openssh -y
       yum install gcc openssl-devel zlib-devel -y
       cd /mnt
       tar zxvf openssh-7.5p1.tar.gz -C /mnt/
       cd ./openssh-7.5p1
       ./configure
       make && make install
 
}
 
CHG_SSHD()
{
       chmod +x /etc/init.d/sshd
       OPT_VALUE='OPTIONS="-f /etc/ssh/sshd_config"'
       OPT_EXIST=`grep "${OPT_VALUE}" /etc/init.d/sshd`
        if [ -z "${OPT_EXIST}" ];then
                sed -i '/$SSHD $OPTIONS &&/i\\t'"${OPT_VALUE}"'' /etc/init.d/sshd
        else
                echo ${OPT_EXIST}
        fi
        PATH_EXIST=`grep "${NPATH}" /etc/init.d/sshd`
        if [ -n "${PATH_EXIST}"  ];then
                echo "${PATH_EXIST}"
        else
                sed -i "s:${OPATH}:${NPATH}:" /etc/init.d/sshd
        fi
              echo "/etc/init.d/sshd file changes completed."
}
CHG_CONF()
{
##Chenge /etc/ssh/sshd_config 
       cp sshd_config /etc/ssh/sshd_config
       sed -i '/#PermitRootLogin/i\PermitRootLogin yes' /etc/ssh/sshd_config
       PATH_EXIST=`grep "${NPATH}" /etc/ssh/sshd_config`
       if [ -z "${PATH_EXIST}" ];then
              sed -i "s:${OPATH}:${NPATH}:" /etc/ssh/sshd_config
       else
              echo "${PATH_EXIST}"
       fi
       echo "/etc/ssh/sshd_config file changes completed."
}
 
OPATH=/usr/
NPATH=/usr/local/
echo -n "The SSH current version is:" 
ssh -V 
while true;do
    echo -n "Continue to update?(yes/no)"
    read INPUT
    case $INPUT in
        Y|y|YES|yes)
            sshInst
      echo -n "Press any key to continue....."
      read AnyKey
 
      cp /usr/local/bin/ssh /usr/bin/ssh
      echo "Copying ssh....Done."
      cp /usr/local/etc/ssh_host_ecdsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub
      echo "Copying ssh_host_ecdsa_key.pub....Done."
      cp /mnt/openssh-7.5p1/contrib/redhat/sshd.init /etc/init.d/sshd
      echo "Copying sshd....Done."
      CHG_SSHD
      CHG_CONF
      break;;
        N|n|NO|no)
          echo exited
          exit ;;
        "")
      break;;
  esac
done
chkconfig --add sshd
chkconfig sshd on
service sshd start
echo "Operation is completed."

原文地址：http://blog.51cto.com/1459687/2112234