1.升级openssh
rpm -Uvh openssh-8.7p1-1.el7.x86_64.rpm openssh-clients-8.7p1-1.el7.x86_64.rpm openssh-server-8.7p1-1.el7.x86_64.rpm
2.修改配置文件
sed -i "s/#PermitRootLogin prohibit-password/PermitRootLogin yes/g" /etc/ssh/sshd_config.rpmnew
sed -i "s/#PasswordAuthentication yes/PasswordAuthentication yes/g" /etc/ssh/sshd_config.rpmnew
3.备份ssh配置文件
cd /etc/ssh/
mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
mv /etc/ssh/sshd_config.rpmnew /etc/ssh/sshd_config
Centos7需要注意将/etc/ssh/xxx_key文件权限修改为600 例如：
chmod 600 ssh_host_ecdsa_key ssh_host_ed25519_key ssh_host_rsa_key
4.修改/etc/pam.d/sshd
echo "
#%PAM-1.0
auth required pam_sepermit.so
auth substack password-auth
auth include postlogin
# Used with polkit to reauthorize users in remote sessions
-auth optional pam_reauthorize.so prepare
account required pam_nologin.so
account include password-auth
password include password-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open env_params
session required pam_namespace.so
session optional pam_keyinit.so force revoke
session include password-auth
session include postlogin
# Used with polkit to reauthorize users in remote sessions
-session optional pam_reauthorize.so prepare
" > /etc/pam.d/sshd
5.修改ssh配置文件、添加Port端口、否则连不上去
vim /etc/ssh/sshd_config
Port 2022
4.重启sshd服务
systemctl restart sshd
