Restrict Recursive Queries

Méthode de vérification

Méthode d'audit: Commande 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 ' ')
if printf '%s\n' "$opts" | grep -Eq '[{; ]recursion no;'; then echo compliant; exit 0; fi
ar=$(printf '%s\n' "$opts" | grep -Eo 'allow-recursion \{[^}]*\}') || { echo 'recursion enabled without allow-recursion'; exit 1; }
printf '%s\n' "$ar" | grep -Eq '[{ ]"?any"?;' && { echo 'allow-recursion contains any'; exit 1; }
echo compliant

Sortie attendue

compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Authoritative Name Server: For an authoritative name server, insert one of the following either into the global options or into every zone section. allow-recursion { localhost; }; recursion no; Caching Name Server: ; Define an ACL named trusted_clients which will identify the networks which are expected to use the DNS caching server, and will be allowed to send recursive DNS queries. acl trusted_clients { 10.19.4.0/28; . . . } ; Insert the following into the global options. allow-recursion { localhost; trusted_clients };

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

tmaegis scan --target bind