SSH 禁用密码登录

ref https://apple.stackexchange.com/a/420554

修改 /etc/ssh/sshd_config 文件，添加如下内容

PasswordAuthentication no
ChallengeResponseAuthentication no

重启 SSH 服务

sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist