macOS(BSD system) 禁用 ssh 密码登录
As any BSD system you should toggle off some options in your sshd_:
sudo vim /etc/ssh/sshd_config
UsePam yes # it will not be used
ChallengeResponseAuthentication no
PasswordAuthentication no
kbdInteractiveAuthentication no
sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist
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