Use Unique Keys for Each Pair of Hosts

中等級 1自動化bind

說明

A unique TSIG key should be used for each pair of communicating hosts. For example, if there is one master authoritative name server and three slave authoritative name servers that were updated by the master, then there would need to be a unique TSIG key for at least the following: ; Master <-> Slave1 ; Master <-> Slave2 ; Master <-> Slave3 The audit requires every key secret and key name in the effective configuration to be unique. 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).

檢查方式

稽核方法: Shell 指令

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 ' ')
d=$(printf '%s\n' "$flat" | grep -Eo 'secret "[^"]*"' | sort | uniq -d | wc -l)
n=$(printf '%s\n' "$flat" | grep -Eo 'key "?[^ "]+"? \{ *algorithm' | sort | uniq -d | wc -l)
[ "$d" -eq 0 ] && [ "$n" -eq 0 ] && echo compliant || echo "duplicate key secrets: $d, duplicate key names: $n"

預期輸出: compliant

修補方式

修補方法: 操作指南或基礎設施修補檔

Generate unique keys for host to host communication. The command below can be used to generate 2 files, a <name>.key file and a <name>.private file with secret keys of suitable length with base64 encoding. The files themselves are not needed, and should be securely deleted once the values are copied into a key file for including in the named configuration. $ dnssec-keygen -a HMAC-SHA256 -b 256 -n HOST ns1-ns2.cisecurity.org Kns1-ns2.cisecurity.org.+163+13013 $ cat Kns1-ns2.cisecurity.org.+163+13013.key ns1-ns2.cisecurity.org. IN KEY 512 3 163 9FQ2dYCQ17HJwDi/uHgANh2dlb8M7eb+F4AjML8tTdA=

屬性

作業系統: 不限
標籤: binddnstsig
參考資料: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 4.3 Use Unique Keys for Each Pair of Hosts

檢查此主機

請在您有權稽核的機器上執行此指令。掃描為唯讀操作。

shell

tmaegis scan --target bind