Linux 系统安全之升级 OPENSSH

旧城等待， 2023-07-08 03:48 6阅读 0赞

![20200225075310998.png][]

**OpenSSH** 是 [SSH][] （Secure [SHell][]） 协议的免费开源实现。SSH协议族可以用来进行远程控制， 或在计算机之间传送文件。而实现此功能的传统方式，如telnet([终端仿真][Link 1]协议)、 rcp ftp、 rlogin、rsh都是极为不安全的，并且会使用明文传送密码。OpenSSH提供了服务端后台程序和客户端工具，用来加密远程控制和文件传输过程中的数据，并由此来代替原来的类似服务。

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网络安全一刻也不能放松，为了系统安全尽量将 OPENSSH 升级到最新版本，目前最新版本为 8.2 P1，下面开始准备升级。

*  实验环境 CentOS 7.5
 *  为了预防万一升级失败后，无法登陆远程主机的问题，需要先安装 、启动Telnet 服务，确保可以远程登录。
 *   
 *  安装、配置 Telnet 以及超级守护进程 xinetd 服务
 *  编辑 telnet 主配置文件 /etc/xinetd.d/telnet
 *  **vim /etc/xinetd.d/telnet**  
      
    service telnet  
    \{  
        disable = no  
        flags       = REUSE  
        socket\_type = stream  
        wait        = no  
        user        = root  
        server      = /usr/sbin/in.telnetd  
        log\_on\_failure  += USERID  
    \}
 *  配置telnet登录的终端类型，在 **/etc/securetty** 文件末尾增加一些pts终端  
    vim /etc/securetty  
    `pts/0 pts/1 pts/2 pts/3`
 *  启动telnet服务  
    systemctl start telnet.socket   
      
    查看服务状态  
    systemctl status telnet.socket   
      
    查看侦听端口  
    ss -atnl | grep 23   
      
    安装完成后，将xinetd服务加入开机自启动:  
    systemctl enable xinetd.service  
      
    将telnet服务加入开机自启动：  
    systemctl enable telnet.socket

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*  使用 telnet 测试登录

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--------------------

*  接下来开始升级 OPENSSH
 *  首先在官网上下载最新版本的源码包
 *  OPENSSH 源码包下载地址：[https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/][https_openbsd.hk_pub_OpenBSD_OpenSSH_portable]
 *  OPENSSL 源码包下载地址：[https://ftp.openssl.org/source/old/][https_ftp.openssl.org_source_old]
 *  wget [https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/openssh-8.2p1.tar.gz][https_openbsd.hk_pub_OpenBSD_OpenSSH_portable_openssh-8.2p1.tar.gz]
 *  wget [https://ftp.openssl.org/source/old/1.1.1/openssl-1.1.1c.tar.gz][https_ftp.openssl.org_source_old_1.1.1_openssl-1.1.1c.tar.gz]
 *  接下来安装 openssh 和 openssl 依赖包
 *  yum -y install epel-release  
    yum -y install perl gcc gcc-c++ glibc make && yum -y group install 'Development Tools' && yum -y install pam-devel libselinux-devel zlib-devel openssl-devel && echo $?
 *  **备份原先的 openssl 文件**
    
    mv /usr/bin/openssl /usr/bin/openssl.old
 *  mv /usr/lib64/openssl /usr/lib64/openssl.old
 *  mv /usr/lib64/libssl.so /usr/lib64/libssl.so.old
 *  解压 openssl 包，编译安装（需要 root 用户）
 *  tar xf [openssl-1.1.1c.tar.gz][https_ftp.openssl.org_source_old_1.1.1_openssl-1.1.1c.tar.gz]
 *  ./config --prefix=/usr/local/openssl && make clean && make && make install && echo $?

![20200225091906624.png][]

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*  编译、安装无误后，下面开始配置 OPENSSL
    
    设置 openssl 命令的软链接  
    ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl
 *  ln -s /usr/local/openssl/include/openssl /usr/include/openssl
 *  ln -s /usr/local/openssl/lib/libssl.so /usr/lib64/libssl.so
 *  echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
 *  ldconfig -v
 *  openssl version
 *

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![20200225092841942.png][]

--------------------

*  ### **开始安装 openssh 前，先备份原先的 openssh 文件** ###
 *  mv /etc/ssh/\* /bak/sshbak
 *  tar xf openssh-8.2p1.tar.gz
 *  ./configure --prefix=/usr --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/openssl \\
 *  \--with-md5-passwords --mandir=/usr/share/man \\
 *  \--with-pam=enable && make clean && make && make install && echo $?
 *  echo $? --> 0 确保编译安装无误后，复制启动脚本和PAM验证文件
 *  cp /home/gf/openssh/openssh-8.2p1/contrib/redhat/sshd.init /etc/init.d/sshd  
    cp /home/gf/openssh/openssh-8.2p1/contrib/redhat/sshd.pam /etc/pam.d/sshd.pam
 *  编辑 /etc/ssh/sshd.conf 配置文件
 *  Port 22  
    PermitRootLogin no  
    PasswordAuthentication yes  
    UsePAM yes  
    UseDNS no  
    Subsystem    sftp    /usr/libexec/sftp-server
 *  给运行脚本添加执行权限 ： chmod +x /etc/init.d/sshd
 *  **把原先的 ****systemd ****管理的 ****sshd 启动脚本****文件删除或者移走**  
    mv /usr/lib/systemd/system/sshd.service /bak/sshbak && mv /usr/lib/systemd/system/sshd.socket /bak/sshbak && echo $?
 *  重新加载服务配置文件后重启 sshd 服务
 *  systemctl daemon-reload && sleep 1 &&systemctl restart sshd &&chkconfig sshd on && echo $?
 *  重启确认无误后可以停掉 telnet 服务
 *  systemctl disable telnet

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*  使用 ssh 测试重新登录

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*  ### **更改默认端口和指定允许访问的网段** ###
 *  \#Port 22  
    Port 2222                                             \#更改端口，注意不要被占用起冲突                                                                                                                                                                         
    \#AddressFamily any  
    \#ListenAddress 0.0.0.0                       \#默认允许所有主机链接  
    **ListenAddress 192.168.2.2:2222     \#注意这里设定的是服务器本地的IPv4网络IP地址和端口**  
    \#ListenAddress ::                               \#IPv6

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*  制定脚本自动升级
 *  opensshupdata/  
    opensshupdata/  
    ├── openssh-8.3p1.tar.gz  
    ├── openssh.sh  
    └── openssl-1.1.1j.tar.gz
 *  ### **opensshupdata/openssh.sh** ###
    
    \#!/bin/bash  
    \#  
    \#\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
    \#author:                GF  
    \#version:              1.0  
    \#date:          2021-05-23  
    \#description:        
    \#FileName：    openssh.sh  
    \#\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
    
    if \[\[ \`id -u\` != "0" \]\]; then  
        echo "not root!"  
        exit 1;  
    fi
    
    if \[\[ -n \`ping -c3 www.baidu.com\` \]\]; then  
        yum -y install epel-release &> /dev/null  
        sleep 1;yum -y install perl gcc gcc-c++ glibc make &> /dev/null  
        sleep 1;yum -y group install 'Development Tools' &> /dev/null  
        sleep 1;yum -y install pam-devel libselinux-devel zlib-devel openssl-devel &> /dev/null  
        sleep 1;echo "Dependency installed successfully !"  
        sleep 1  
    else  
        echo "Network is unreachable !"  
        exit 2;  
    fi 
    
    if \[\[ \`echo $?\` == "0" \]\]; then  
        echo "Dependency installed successfully !"  
    else  
        echo "Dependency installed not successfully!"  
        exit 3;  
    fi
    
    if \[\[ -f ./openssl-1.1.1j.tar.gz \]\]; then  
        tar xf ./openssl-1.1.1j.tar.gz &> /dev/null  
        sleep 2;cd ./openssl-1.1.1j  
        sleep 2;./config --prefix=/usr/local/openssl &> /dev/null && make clean &> /dev/null && make -j 4 &> /dev/null && make install &> /dev/null  
    fi
    
    if \[\[ \`echo $?\` != "0" \]\]; then  
        echo "openssl 1.1.1j make install is faild !"  
        exit 4;  
    else  
        echo "openssl 1.1.1j make and make install is OK!"  
        sleep 1  
        sleep 1;mv -f /usr/bin/openssl /usr/bin/openssl.old &> /dev/null  
        sleep 1;mv -f /usr/lib64/openssl /usr/lib64/openssl.old &> /dev/null  
        sleep 1;mv -f /usr/lib64/libssl.so /usr/lib64/libssl.so.old &> /dev/null  
        sleep 1; ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl &> /dev/null  
        sleep 1; ln -s /usr/local/openssl/include/openssl /usr/include/openssl &> /dev/null  
        sleep 1; ln -s /usr/local/openssl/lib/libssl.so /usr/lib64/libssl.so &> /dev/null  
        echo "/usr/local/openssl/lib" > /etc/ld.so.conf.d/openssl.conf  
        ldconfig -v &> /dev/null  
    fi
    
    /usr/bin/openssl version | grep -o "OpenSSL 1.1.1j" &> /dev/null  
    if \[\[ \`echo $?\` != "0" \]\]; then  
        echo "openssl 1.1.1j is not updata !"  
        exit 5;  
    else  
        echo "openssl 1.1.1j updata is ok!"  
        cd ../  
        rm -rf ./openssl-1.1.1j  
    fi
    
    if \[\[ -f ./openssh-8.5p1.tar.gz \]\]; then  
        mkdir -p /bak/sshbak &> /dev/null  
        mv -f /etc/ssh/\* /bak/sshbak  
        tar xf ./openssh-8.5p1.tar.gz &> /dev/null  
        sleep 2;cd ./openssh-8.5p1  
        sleep 2;./configure --prefix=/usr --sysconfdir=/etc/ssh --with-ssl-dir=/usr/local/openssl --with-md5-passwords --mandir=/usr/share/man --with-pam=enable &> /dev/null&& make clean &> /dev/null&& make -j 4 &> /dev/null && make install &> /dev/null  
    else  
        echo "openssh-8.5p1.tar.gz not found !"  
        exit 12;  
    fi
    
    if \[\[ \`echo $?\` != "0" \]\]; then  
        echo "openssh 8.5p1 not make install !"  
        exit 6;  
    else  
        echo "openssh 8.5p1 make install is ok!"  
    fi
    
    if \[\[ -f ./contrib/redhat/sshd.init \]\]; then  
        install ./contrib/redhat/sshd.init /etc/init.d/sshd  
        chmod +x /etc/init.d/sshd  
    else  
        echo "sshd.init file not found!"  
        exit 7;  
    fi
    
      
    if \[\[ -f ./contrib/redhat/sshd.pam \]\]; then  
        install ./contrib/redhat/sshd.pam /etc/pam.d/sshd.pam  
    else  
        echo "sshd.pam file not found!"  
        exit 11;  
    fi
    
    if \[\[ \`echo $?\` != "0" \]\]; then  
        echo "openssh not make install !"  
        exit 8;  
    fi
    
    if \[\[ -f /etc/ssh/sshd\_config \]\]; then  
        sed -i "s/\#PermitRootLogin .\*/PermitRootLogin yes/g" /etc/ssh/sshd\_config  
        sed -i "s/PermitRootLogin .\*/PermitRootLogin yes/g" /etc/ssh/sshd\_config  
        sed -i "s/\#PasswordAuthentication .\*/PasswordAuthentication yes/g" /etc/ssh/sshd\_config  
        sed -i "s/PasswordAuthentication .\*/PasswordAuthentication yes/g" /etc/ssh/sshd\_config  
        sed -i "s/\#PermitEmptyPasswords .\*/PermitEmptyPasswords no/g" /etc/ssh/sshd\_config  
        sed -i "s/PermitEmptyPasswords .\*/PermitEmptyPasswords no/g" /etc/ssh/sshd\_config  
        sed -i "s/\#UsePAM no/UsePAM yes/g" /etc/ssh/sshd\_config  
        sed -i "s/UsePAM no/UsePAM yes/g" /etc/ssh/sshd\_config  
        sed -i "s/\#UseDNS no/UseDNS no/g" /etc/ssh/sshd\_config  
        sed -i "s/UseDNS yes/UseDNS no/g" /etc/ssh/sshd\_config  
    else  
        echo "file /etc/ssh/sshd\_config is not found !"  
        exit 9:  
    fi
    
    if \[\[ \`echo $?\` = "0" \]\]; then  
        mv -f /usr/lib/systemd/system/sshd.service /bak/sshbak &> /dev/null  
        mv -f /usr/lib/systemd/system/sshd.socket /bak/sshbak &> /dev/null  
        systemctl daemon-reload && sleep 1 &&systemctl restart sshd &&chkconfig sshd on  
    else  
        echo "sshd service not start !"  
        exit 10;  
    fi
    
    if \[\[ \`echo $?\` == "0" \]\]; then  
        echo "sshd service is start!"  
        cd ../  
        rm -rf ./openssh-8.5p1  
    else  
        echo "sshd service is not start !"  
        exit 13;  
    fi  
    ss -a|grep ssh  
    ssh -V  
    openssl version
 *  测试

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[20200225075310998.png]: https://img-blog.csdnimg.cn/20200225075310998.png
[SSH]: https://baike.baidu.com/item/SSH
[SHell]: https://baike.baidu.com/item/SHell
[Link 1]: https://baike.baidu.com/item/%E7%BB%88%E7%AB%AF%E4%BB%BF%E7%9C%9F/3441931
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[https_openbsd.hk_pub_OpenBSD_OpenSSH_portable]: https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/
[https_ftp.openssl.org_source_old]: https://ftp.openssl.org/source/old/
[https_openbsd.hk_pub_OpenBSD_OpenSSH_portable_openssh-8.2p1.tar.gz]: https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/openssh-8.2p1.tar.gz
[https_ftp.openssl.org_source_old_1.1.1_openssl-1.1.1c.tar.gz]: https://ftp.openssl.org/source/old/1.1.1/openssl-1.1.1c.tar.gz
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