Securely Authenticate Update Forwarding

SedangLevel 1Otomatisbind

Deskripsi

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).

Cara pemeriksaan

Metode audit: Perintah shell

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; }

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

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

Properti

Sistem operasi: Apa saja
Tag: binddnszone-transfer
Referensi: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 5.3 Securely Authenticate Update Forwarding

Periksa host ini

Jalankan ini pada mesin yang diizinkan untuk Anda audit. Pemindaian bersifat hanya baca.

shell

tmaegis scan --target bind