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user毎にiptablesでsshを制限

お客さんからあるサーバを一般ユーザとして使ってもらうが、sshの踏み台みたいには使われないで欲しいという要件があったのでiptablesで対応した。

環境

  • OS : ubuntu18.04.3

iptablesでユーザ毎にsshを制限

iptables -A OUTPUT -p tcp --dport 22 -m owner --uid-owner {USERNAME} -j DROP

なお相手サーバのLISTENポートが22番以外だった場合、無意味なので環境によって適時変えて欲しい。

設定の永続化

apt install iptables-persistent
/etc/init.d/iptables-persistent save 
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