最近公司系统在进行三级等保测评,其中有一项高危漏洞是Linux服务器的SSH版本太低存在安全风险,要求整改升级到最新版本,此篇文章记录SSH升级步骤和脚本。

鸣谢:本文参考文章,在该作者文章的所提供的脚本基础上进行修改而来:Linux OpenSSH-9.0p1最新版升级步骤详细(附脚本)_ssh升级脚本-CSDN博客

环境准备及软件下载相关步骤,请参考以上作者原文章,写的非常详细,这里只对一些优化和改进的地方进行记录。

编写脚本,该脚本在参考原文脚本的基础上修改(完整脚本,直接复制可用)

#!/bin/bash
#
#########################################################
# Function :openssh-9.6p1 update                        #
# Platform :Centos7.X                                   #
# Version  :2.0                                         #
# Date     :2022-05-01                                  #     
#########################################################
clear
export LANG="en_US.UTF-8"
#修改1:此处的zlib原来的版本zlib-1.2提示下载失败,改完最新版本号可正常下载,
#最新版本可在此地址查看:https://www.zlib.net/,截止本文修改日期最新版本为1.3.1
#openssl和openssh下载不同的版本在此处修改版本号即可
zlib_version="zlib-1.3.1"
openssl_version="openssl-1.1.1q"
openssh_version="openssh-9.6p1"

#安装包地址,这里存在一个问题,如果文件夹没有提前建好,后续执行脚本将报错
file="/opt"
#默认编译路径
default="/usr/local"
date_time=`date +%Y-%m-%d—%H:%M`
#安装目录
file_install="$file/openssh_install"
file_backup="$file/openssh_backup"
file_log="$file/openssh_log"

#修改2:为了解决文件夹不存在的问题,我这里添加了创建文件夹的脚本---start
if [ ! -d "$file_install" ]; then
  mkdir "$file_install"
fi

if [ ! -d "$file_backup" ]; then
  mkdir "$file_backup"
fi

if [ ! -d "$file_log" ]; then
  mkdir "$file_log"
fi

if [ ! -d "$file_install/zlib" ]; then
  mkdir "$file_install/zlib"
fi
#修改2:为了解决文件夹不存在的问题,我这里添加了创建文件夹的脚本---end

#源码包链接
zlib_download="https://www.zlib.net/$zlib_version.tar.gz"
openssl_download="https://www.openssl.org/source/$openssl_version.tar.gz"
openssh_download="https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/$openssh_version.tar.gz"
Install_make()
{
# Check if user is root
	if [ $(id -u) != "0" ]; then
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 当前用户为普通用户,必须使用root用户运行,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 4
	exit
	fi
#判断是否安装wget
echo -e "\033[33m 正在安装Wget...... \033[0m"
sleep 2
echo ""
	if ! type wget >/dev/null 2>&1; then
		yum install -y wget
	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " wget已经安装了:" "\033[32m Please continue\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	fi
#判断是否安装tar
echo -e "\033[33m 正在安装TAR...... \033[0m"
sleep 2
echo ""
	if ! type tar >/dev/null 2>&1; then
		yum install -y tar
	else
	echo ""
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " tar已经安装了:" "\033[32m Please continue\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	fi
	echo ""
#安装相关依赖包
echo -e "\033[33m 正在安装依赖包...... \033[0m"
sleep 3
echo ""
	yum install gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel zlib-devel tcp_wrappers-devel tcp_wrappers
	if [ $? -eq 0 ];then
	echo ""
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
   		echo -e " 安装软件依赖包成功 " "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	else
   	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
   		echo -e " 解压源码包失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	sleep 4
	exit
	fi
	echo ""
}
Install_backup()
{
#创建文件(可修改)
mkdir -p $file_install
mkdir -p $file_backup
mkdir -p $file_log
mkdir -p $file_backup/zlib
mkdir -p $file_backup/ssl
mkdir -p $file_backup/ssh
mkdir -p $file_log/zlib
mkdir -p $file_log/ssl
mkdir -p $file_log/ssh
#备份文件(可修改)
cp -rf /usr/bin/openssl  $file_backup/ssl/openssl_$date_time.bak > /dev/null
cp -rf /etc/init.d/sshd  $file_backup/ssh/sshd_$date_time.bak > /dev/null
cp -rf /etc/ssh  $file_backup/ssh/ssh_$date_time.bak > /dev/null
cp -rf /usr/lib/systemd/system/sshd.service  $file_backup/ssh/sshd_$date_time.service.bak > /dev/null
cp -rf /etc/pam.d/sshd.pam  $file_backup/ssh/sshd_$date_time.pam.bak > /dev/null
}
Remove_openssh()
{
##并卸载原有的openssh(可修改)
rpm -e --nodeps `rpm -qa | grep openssh`
}
Install_tar()
{
#下载的源码包,检查是否解压(可修改)
#	if [ -e $file/$zlib_version.tar.gz ] && [ -e $file/$openssl_version.tar.gz ] && [ -e /$file/$openssh_version.tar.gz ];then
#		echo -e " 下载软件源码包已存在  " "\033[32m  Please continue\033[0m"
#	else
#		echo -e "\033[33m 未发现本地源码包,链接检查获取中........... \033[0m "
#	echo ""
#	cd $file
#	wget --no-check-certificate  $zlib_download
#	wget --no-check-certificate  $openssl_download
#	wget --no-check-certificate  $openssh_download
#	echo ""
#	fi
#zlib
echo -e "\033[33m 正在下载Zlib软件包...... \033[0m"
sleep 3
echo ""
	if [ -e $file/$zlib_version.tar.gz ] ;then
		echo -e " 下载软件源码包已存在  " "\033[32m  Please continue\033[0m"
	else
		echo -e "\033[33m 未发现zlib本地源码包,链接检查获取中........... \033[0m "
	sleep 1
	echo ""
	cd $file
	wget --no-check-certificate  $zlib_download
	echo ""
	fi
#openssl
echo -e "\033[33m 正在下载Openssl软件包...... \033[0m"
sleep 3
echo ""
	if  [ -e $file/$openssl_version.tar.gz ]  ;then
		echo -e " 下载软件源码包已存在  " "\033[32m  Please continue\033[0m"
	else
		echo -e "\033[33m 未发现openssl本地源码包,链接检查获取中........... \033[0m "
	echo ""
	sleep 1
	cd $file
	wget --no-check-certificate  $openssl_download
	echo ""
	fi
#openssh
echo -e "\033[33m 正在下载Openssh软件包...... \033[0m"
sleep 3
echo ""
	if [ -e /$file/$openssh_version.tar.gz ];then
		echo -e " 下载软件源码包已存在  " "\033[32m  Please continue\033[0m"
	else
		echo -e "\033[33m 未发现openssh本地源码包,链接检查获取中........... \033[0m "
	echo ""
	sleep 1
	cd $file
	wget --no-check-certificate  $openssh_download
	fi
}
echo ""
echo ""
#安装zlib
Install_zlib(){
echo -e "\033[33m 1.1-正在解压Zlib软件包...... \033[0m"
sleep 3
echo ""
    cd $file && mkdir -p $file_install && tar -xzf zlib*.tar.gz -C $file_install > /dev/null
    if [ -d $file_install/$zilb_version ];then
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
              		echo -e "  zilb解压源码包成功" "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
        	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
              		echo -e "  zilb解压源码包失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
    echo ""
    sleep 4
    exit
    fi
echo -e "\033[33m 1.2-正在编译安装Zlib服务.............. \033[0m"
sleep 3
echo ""
     #这里原脚本写法:cd $file_install/zlib*,我遇到了cd目录失败问题,将此处修改如下
    cd $file_install/$zlib_version
	echo -e "$pwd"
	./configure --prefix=$default/$zlib_version > $file_log/zlib/zlib_configure_$date_time.txt  #> /dev/null 2>&1
	if [ $? -eq 0 ];then
	echo -e "\033[33m make... \033[0m"
		make > /dev/null 2>&1
	echo $?
	echo -e "\033[33m make test... \033[0m"
		make test > /dev/null 2>&1
	echo $?
	echo -e "\033[33m make install... \033[0m"
		make install > /dev/null 2>&1
	echo $?
	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e "  编译安装压缩库失败,脚本退出中..." "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 4
	exit
	fi

	if [ -e $default/$zlib_version/lib/libz.so ];then
	sed -i '/zlib/'d /etc/ld.so.conf
	echo "$default/$zlib_version/lib" >> /etc/ld.so.conf
	echo "$default/$zlib_version/lib" >> /etc/ld.so.conf.d/zlib.conf
	ldconfig -v > $file_log/zlib/zlib_ldconfig_$date_time.txt > /dev/null 2>&1
	/sbin/ldconfig
	fi
}
echo ""
echo ""
Install_openssl(){
echo -e "\033[33m 2.1-正在解压Openssl...... \033[0m"
sleep 3
echo ""
    cd $file  &&  tar -xvzf openssl*.tar.gz -C $file_install > /dev/null
	if [ -d $file_install/$openssl_version ];then
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
              		echo -e "  OpenSSL解压源码包成功" "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
        	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
              		echo -e "  OpenSSL解压源码包失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
    echo ""
    sleep 4
    exit
    fi
	echo ""
echo -e "\033[33m 2.2-正在编译安装Openssl服务...... \033[0m"
sleep 3
echo ""
	cd $file_install/$openssl_version
        ./config shared zlib --prefix=$default/$openssl_version >  $file_log/ssl/ssl_config_$date_time.txt  #> /dev/null 2>&1
	if [ $? -eq 0 ];then
	echo -e "\033[33m make clean... \033[0m"
		make clean > /dev/null 2>&1
	echo $?
	echo -e "\033[33m make -j 4... \033[0m"
		make -j 4 > /dev/null 2>&1
	echo $?
	echo -e "\033[33m make install... \033[0m"
		make install > /dev/null 2>&1
	echo $?
	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e "  编译安装OpenSSL失败,脚本退出中..." "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 4
	exit
	fi
	mv /usr/bin/openssl /usr/bin/openssl_$date_time.bak    #先备份
	if [ -e $default/$openssl_version/bin/openssl ];then
	sed -i '/openssl/'d /etc/ld.so.conf
	echo "$default/$openssl_version/lib" >> /etc/ld.so.conf
	ln -s $default/$openssl_version/bin/openssl /usr/bin/openssl
	ln -s $default/$openssl_version/lib/libssl.so.1.1 /usr/lib64/libssl.so.1.1 
	ln -s $default/$openssl_version/lib/libcrypto.so.1.1 /usr/lib64/libcrypto.so.1.1 
	ldconfig -v > $file_log/ssl/ssl_ldconfig_$date_time.txt > /dev/null 2>&1
	/sbin/ldconfig
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 编译安装OpenSSL " "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
echo -e "\033[33m 2.3-正在输出 OpenSSL 版本状态.............. \033[0m"
sleep 3
echo ""
	echo -e "\033[32m====================== OpenSSL veriosn =====================  \033[0m"
	echo ""
		openssl version -a
	echo ""
	echo -e "\033[32m=======================================================  \033[0m"
	sleep 2
	else
	echo ""
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " OpenSSL软连接失败,脚本退出中..." "\033[31m  Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	fi
}
echo ""
echo ""
Install_openssh(){
echo -e "\033[33m 3.1-正在解压OpenSSH...... \033[0m"
sleep 3
echo ""
	cd $file && tar -xvzf openssh*.tar.gz -C $file_install > /dev/null
	if [ -d $file_install/$openssh_version ];then
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
         echo -e "  OpenSSh解压源码包成功" "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
        	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
         echo -e "  OpenSSh解压源码包失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
    echo ""
    sleep 4
    exit
    fi
	echo ""
echo -e "\033[33m 3.2-正在编译安装OpenSSH服务...... \033[0m"
sleep 3
echo ""
	mv /etc/ssh /etc/ssh_$date_time.bak     #先备份
	cd $file_install/$openssh_version
	./configure --prefix=$default/$openssh_version --sysconfdir=/etc/ssh --with-ssl-dir=$default/$openssl_version --with-zlib=$default/$zlib_version >  $file_log/ssh/ssh_configure_$date_time.txt   #> /dev/null 2>&1
	if [ $? -eq 0 ];then
	echo -e "\033[33m make -j 4... \033[0m"
		make -j 4 > /dev/null 2>&1
	echo $?
	echo -e "\033[33m make install... \033[0m"
		make install > /dev/null 2>&1
	echo $?
	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 编译安装OpenSSH失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 4
	exit
	fi
	echo ""
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 编译安装OpenSSH " "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 2
	echo -e "\033[32m==================== OpenSSH—file veriosn =================== \033[0m"
	echo ""
		/usr/local/$openssh_version/bin/ssh -V
	echo ""
	echo -e "\033[32m======================================================= \033[0m"
	sleep 3
	echo ""
echo -e "\033[33m 3.3-正在迁移OpenSSH配置文件...... \033[0m"
sleep 3
echo ""
#迁移sshd
	if [ -f  "/etc/init.d/sshd" ];then
		mv /etc/init.d/sshd /etc/init.d/sshd_$date_time.bak
	else
		echo -e " /etc/init.d/sshd不存在 " "\033[31m Not backed up(可忽略)\033[0m"
	fi
	cp -rf $file_install/$openssh_version/contrib/redhat/sshd.init /etc/init.d/sshd;
	chmod u+x /etc/init.d/sshd;
	chkconfig --add sshd      ##自启动
	chkconfig --list |grep sshd;
	chkconfig sshd on
#备份启动脚本,不一定有
	if [ -f  "/usr/lib/systemd/system/sshd.service" ];then
		mv /usr/lib/systemd/system/sshd.service /usr/lib/systemd/system/sshd.service_bak
	else
		echo -e " sshd.service不存在" "\033[31m Not backed up(可忽略)\033[0m"
	fi
#备份复制sshd.pam文件
	if [ -f "/etc/pam.d/sshd.pam" ];then
		mv /etc/pam.d/sshd.pam /etc/pam.d/sshd.pam_$date_time.bak 
	else
        echo -e " sshd.pam不存在" "\033[31m Not backed up(可忽略)\033[0m"
	fi
	cp -rf $file_install/$openssh_version/contrib/redhat/sshd.pam /etc/pam.d/sshd.pam
#迁移ssh_config	
	cp -rf $file_install/$openssh_version/sshd_config /etc/ssh/sshd_config
	sed -i 's/Subsystem/#Subsystem/g' /etc/ssh/sshd_config
	echo "Subsystem sftp $default/$openssh_version/libexec/sftp-server" >> /etc/ssh/sshd_config
	cp -rf $default/$openssh_version/sbin/sshd /usr/sbin/sshd
	cp -rf /$default/$openssh_version/bin/ssh /usr/bin/ssh
	cp -rf $default/$openssh_version/bin/ssh-keygen /usr/bin/ssh-keygen
	sed -i 's/#PasswordAuthentication\ yes/PasswordAuthentication\ yes/g' /etc/ssh/sshd_config
	#grep -v "[[:space:]]*#" /etc/ssh/sshd_config  |grep "PubkeyAuthentication yes"
	echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config
#重启sshd
	service sshd start > /dev/null 2>&1
	if [ $? -eq 0 ];then
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 启动OpenSSH服务成功" "\033[32m Success\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	echo ""
	sleep 2
	#删除源码包(可修改)
	rm -rf $file/*$zlib_version.tar.gz
	rm -rf $file/*$openssl_version.tar.gz
	rm -rf $file/*$openssh_version.tar.gz
	#rm -rf $file_install
echo -e "\033[33m 3.4-正在输出 OpenSSH 版本...... \033[0m"
sleep 3
echo ""
	echo -e "\033[32m==================== OpenSSH veriosn =================== \033[0m"
	echo ""
		ssh -V
	echo ""
	echo -e "\033[32m======================================================== \033[0m"
	else
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
		echo -e " 启动OpenSSH服务失败,脚本退出中......" "\033[31m Error\033[0m"
	echo -e "\033[33m--------------------------------------------------------------- \033[0m"
	sleep 4
	exit
	fi
	echo ""
}
End_install()
{
##sshd状态
	echo ""
	echo -e "\033[33m 输出sshd服务状态: \033[33m"
	sleep 2
	echo ""
	systemctl status sshd.service
	echo ""
	echo ""
	echo ""
	sleep 1
echo -e "\033[33m==================== OpenSSH file =================== \033[0m"
echo ""
	echo -e " Openssh升级安装目录请前往:  "
	cd  $file_install && pwd
	cd ~
	echo ""
	echo -e " Openssh升级备份目录请前往:  " 
	cd  $file_backup && pwd
	cd ~
	echo ""
	echo -e " Openssh升级日志目录请前往:  "
	cd  $file_log && pwd
	cd ~
	echo ""
echo -e "\033[33m======================================================= \033[0m"
}
Install_make
Install_backup
Remove_openssh
Install_tar
Install_zlib
Install_openssl
Install_openssh
End_install
  • 上传脚本到Linux并转换sh脚本文件格式

 windows电脑环境编辑的脚本文件上传到Linux环境可能会遇到的问题

[root@localhost soft]# sh sshupdate.sh 
sshupdate.sh: line 120: syntax error near unexpected token `$'\r''
[root@localhost soft]# 

原因分析:报错原因是因为脚本window操作系统和Linux操作系统换行符的编码不一样

解决办法:脚本在执行前需使用dos2unix命令转换文件格式

具体步骤:

#dos2unix命令安装:

yum -y install dos2unix

#转换文件格式,sshupdate.sh是你要转换的sh脚本,根据个人文件名称修改:
dos2unix sshupdate.sh 
dos2unix: converting file sshupdate.sh to Unix format ...
  • 执行脚本,等待完成

sh ./sshupdate.sh
  • 测试验证

查看SSH版本
ssh -V

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