TMA-BIND-3.2

Restrict Recursive Queries

TinggiLevel 1Otomatisbind

Deskripsi

A recursive DNS query is your typical DNS query from a client to a caching DNS server. It places the burden of finding the answer on the caching DNS server which will recursively query other DNS servers authoritative for the domains, until it gets the answer which is then returned to the client. The audit passes when the global options set "recursion no;" or an allow-recursion list that does not contain any. 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 ' ')
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

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

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 };

Properti

Sistem operasi: Apa saja
Tag: binddnsaccess-control
Referensi: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 3.2 Restrict Recursive Queries

Periksa host ini

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

shell

tmaegis scan --target bind