Restrict Query Origins

中级别 1自动化bind

说明

BIND can be configured to restrict access to its query services based on source IP address. It is recommended that the allow-query option be used to restrict access to only the networks authorized to use the name server. The audit requires a global allow-query option; confirm it lists only localhost and the authorized networks (any is acceptable only for an external authoritative-only server). 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).

检查方式

审计方法: Shell 命令

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 ' ')
printf '%s\n' "$opts" | grep -Eq '[{; ]allow-query \{' && echo compliant || echo 'no global allow-query option'

预期输出: compliant

修复方式

修复方法: 操作指南或基础设施补丁

For remediation: ; Create an ACL for the authorized trusted networks in the named.conf file. acl authorized_networks { 10.10.32.0/24; 10.10.34.0/24; . . . }; Add the allow-query statement to the global options of the named.conf file with the localhost ACL and the authorized trusted networks ACL. allow-query { localhost; authorized_networks };

属性

操作系统: 任意
标签: binddnsaccess-control
参考: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 3.3 Restrict Query Origins

检查本机

请在您有权审计的机器上运行此命令。扫描为只读操作。

shell

tmaegis scan --target bind