BIND DNS
TMA-BIND-8.2
Ensure Signing Keys are Generated with a Secure Algorithm
Beschreibung
When Zone Signing Keys (ZSK) or Key Signing Keys (KSK) are generated there are several secure DNSSEC digital signature algorithms that are recommended. The algorithms are listed below with the standard DNSSEC algorithm number followed by the common name, and then the BIND 9 mnemonic name used by dnssec-keygen. The audit reads the Algorithm: line of every K*.private key file under $BIND_HOME and requires RSASHA256 (8), RSASHA512 (10), ECDSAP256SHA256 (13), ECDSAP384SHA384 (14) or ED25519 (15).
So wird geprüft
Prüfmethode: Shell-Befehl
BH=''; for d in /var/named /etc/bind /var/cache/bind; do [ -d "$d" ] && BH="$BH $d"; done
[ -n "$BH" ] || { echo 'no BIND directory found'; exit 1; }
RUN=''; for d in /run/named /var/run/named; do [ -d "$d" ] && { RUN=$d; break; }; done
G='-group root'; U='-user root'; for a in named bind; do grep -q "^$a:" /etc/group 2>/dev/null && G="$G -o -group $a"; grep -q "^$a:" /etc/passwd 2>/dev/null && U="$U -o -user $a"; done
RT='^(/var/named(/chroot/var/named)?/(dynamic|slaves|data)|/var/named/chroot/(var/)?run/named|/var/named/chroot/var/log|/var/named/chroot/(var/)?tmp|/var/cache/bind|/run/named|/var/run/named)(/|$)'
keys=$(find $BH /etc/bind/keys -name 'K*.private' -type f 2>/dev/null | sort -u)
[ -n "$keys" ] || { echo compliant; exit 0; }
bad=$(for k in $keys; do a=$(awk '/^Algorithm:/{print $2; exit}' "$k"); case "$a" in 8|10|13|14|15) ;; *) echo "$k: algorithm ${a:-unknown}" ;; esac; done)
[ -z "$bad" ] && echo compliant || printf '%s\n' "$bad"- Erwartete Ausgabe
compliant
So wird behoben
Behebungsmethode: Anleitung oder Infrastruktur-Patch
To remediate a weak key, perform the following: ; Generate a new key to replace the weak key using dnssec-keygen and one of the recommended algorithms. Examples commands are shown below. # dnssec-keygen -a RSASHA256 -b 2048 example.com # dnssec-keygen -a ECDSAP384SHA384 cisecurity.org ; Implement a rollover period to phase out the weak key and replace it with the newly generated key. ; Once the key is fully deleted from active use, remove the file.
Eigenschaften
- Betriebssysteme
- Beliebig
- Tags
- binddnsdnssec
- Referenz
- CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 8.2 Ensure Signing Keys are Generated with a Secure Algorithm
Diesen Host prüfen
Führen Sie dies auf einem Rechner aus, den Sie prüfen dürfen. Der Scan ist schreibgeschützt.
tmaegis scan --target bind --level 2