TMA-BIND-5.3

Securely Authenticate Update Forwarding

中レベル 1自動bind

説明

A secondary authoritative name server is allowed to accept zone updates on behalf of the primary name server, and forward them to the master name server, where the zone file can be updated. In this case, the authentication of the dynamic updates is configured with the allow-update-forwarding option. The audit requires every allow-update-forwarding list to contain only none or key <name> entries. The audit parses the effective configuration printed by named-checkconf -p (all include files resolved) from /etc/named.conf (RHEL; chroot /var/named/chroot is detected) or /etc/bind/named.conf (Debian/Ubuntu).

チェック方法

監査方法: シェルコマンド

shell

if [ -f /var/named/chroot/etc/named.conf ]; then out=$(named-checkconf -t /var/named/chroot -p /etc/named.conf 2>/dev/null) || exit 1
else conf=/etc/named.conf; [ -f "$conf" ] || conf=/etc/bind/named.conf
  out=$(named-checkconf -p "$conf" 2>/dev/null) || exit 1; fi
flat=$(printf '%s\n' "$out" | tr '\t\n' '  ' | tr -s ' ')
opts=$(printf '%s\n' "$out" | awk '/^options[ \t]*\{/{f=1} f{print} f&&/^\};/{exit}' | tr '\t\n' '  ' | tr -s ' ')
bad=$(printf '%s\n' "$flat" | grep -Eo '(^|[ ;{])allow-update-forwarding \{[^}]*\}' | sed 's/.*allow-update-forwarding {//; s/}$//' | tr ';' '\n' | sed 's/^ *//; s/ *$//' | grep -v '^$' | grep -Eiv '^("?none"?|key "?[^ "]+"?)$')
[ -z "$bad" ] && echo compliant || { echo 'allow-update-forwarding entries not allowed:'; printf '%s\n' "$bad" | sort -u; }

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

Modify any allow-update-forwarding options to specify a securely generated TSIG or SIG(0) key identifier used by the DHCP server.

プロパティ

オペレーティングシステム: すべて
タグ: binddnszone-transfer
参照: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 5.3 Securely Authenticate Update Forwarding

このホストをチェック

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 bind