openssh升级

系统版本：centos-7

1. 安装依赖包

   yum install wget gcc -y
   yum install zlib-devel openssl-devel  openssl -y
   yum install pam-devel libselinux-devel glibc make autoconf pcre-devel -y
   

2. 下载安装包

   wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.6p1.tar.gz
   wget https://www.openssl.org/source/old/1.1.1/openssl-1.1.1j.tar.gz
   wget http://prdownloads.sourceforge.net/libpng/zlib-1.2.11.tar.gz
   

3. 编译安装zlib

   tar xf zlib-1.2.11.tar.gz
   cd zlib-1.2.11
   ./configure --prefix=/usr/local/zlib
   make && make install
   

4. 编译安装openssl

   tar xf 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
   
   #执行openssl version遇到下面为问题：
   openssl: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory
   执行两条命令即可：
   ln -s /usr/local/lib64/libssl.so.1.1 /usr/lib64/libssl.so.1.1
   ln -s /usr/local/lib64/libcrypto.so.1.1 /usr/lib64/libcrypto.so.1.1
   

5. 编译安装openssh

   tar xf openssh-8.6p1.tar.gz
   cd openssh-8.6p1
   ./configure --prefix=/usr/local/openssh --with-zlib=/usr/local/zlib --with-ssl-dir=/usr/local/ssl
   make && make install
   

6. 修改sshd_config文件

   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
   

7. 备份原有文件，修改新文件指向

   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
   

8. 复制配置文件

   cp -a contrib/redhat/sshd.init  /etc/init.d/sshd
   cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam
   chmod u+x /etc/init.d/sshd
   

9. 配置开机自启

   chkconfig --add sshd
   chkconfig sshd on
   systemctl enable sshd
   mv  /usr/lib/systemd/system/sshd.service{,.bak}
   

10. 重启

    service sshd status
    
    # 如果出现“Failed to get properties: Access denied”
    执行：systemctl daemon-reexec
    
    service sshd restart
    

11. 查看结果

    [root@ct1 openssh-8.6p1]# ssh -V
    OpenSSH_8.6p1, OpenSSL 1.1.1j  16 Feb 2021