Ensure sshd PermitRootLogin is configured

高レベル 1自動aix

説明

This recommendation disables direct root login via SSH using a password. To be absolutely certain direct login is disabled the recommendation requires this variable is set rather than rely on a default that might change after an update to SSH. The recommendation requires an edit of the file /etc/ssh/sshd_config file to disable direct root login. Audit: evaluates the effective configuration from `sshd -T` (Match blocks must be reviewed separately).

チェック方法

監査方法: シェルコマンド

shell

command -v sshd >/dev/null 2>&1 || exit 1; out=$(sshd -T 2>/dev/null) || exit 1; r=compliant; for p in '^permitrootlogin[[:blank:]]+(no|prohibit-password|without-password|forced-commands-only)$'; do printf '%s\n' "$out" | grep -Eiq -- "$p" || r="not matched: $p"; done; echo "$r"

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

#!/usr/bin/ksh PREFERRED_SETTING="prohibit-password" umask 077 set $(/usr/bin/egrep "^PermitRootLogin" /etc/ssh/sshd_config) echo $? if [[ ! -z $1 ]]; then # Look for a setting and change to no if anything else if [[ $2 != ${PREFERRED_SETTING} ]]; then sed "s/^PermitRootLogin \{1\}[^ ]\{1,\}/PermitRootLogin ${PREFERRED_SETTING}/" /etc/ssh/sshd_config >/tmp/sshd_config.$$ fi else # Look for a comment and append sed "/^# \{0,\}PermitRootLogin/ a\^JPermitRootLogin ${PREFERRED_SETTING}/" /etc/ssh/sshd_config >/tmp/sshd_config.$$ fi if [[ -e /tmp/sshd_config.$$ ]]; then diff -u /tmp/sshd_config.$$ /etc/ssh/sshd_config rm /tmp/sshd_config.$$ elif # Verify setting is specified /usr/bin/egrep "^PermitRootLogin" /etc/ssh/sshd_config >>/dev/null if [[ $? -ne 0 ]]; then print "PermitRootLogin ${PREFERRED_SETTING}" >> /etc/ssh/sshd_config fi fi Re-cycle the sshd daemon to pick up the configuration changes: stopsrc -s sshd sleep 5 startsrc -s sshd

プロパティ

オペレーティングシステム: すべて
タグ: aixssh
参照: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.3.14 Ensure sshd PermitRootLogin is configured

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監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target aix