Set Group Read-Only for BIND Files and Non-Runtime Directories

中等級 1自動化bind

說明

All of the BIND files and all of directories except the run-time directories into which BIND will create files should have group permissions set to not be writable. Any run-time files created by BIND will be owned by BIND, and therefore need not be group writable. The audit lists group-writable directories (outside runtime directories) and group-writable files under $BIND_HOME and requires none. $BIND_HOME is taken as the existing ones of /var/named (RHEL, including a chroot), /etc/bind and /var/cache/bind (Debian/Ubuntu) and $RUNDIR as /run/named; the runtime directories (dynamic, slaves, data, run, log, tmp, /var/cache/bind) are excluded where the benchmark excludes them.

檢查方式

稽核方法: Shell 指令

shell

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 $a"; done
RT='^(/var/named(/chroot/var/named)?/(dynamic|slaves|data)|/var/named/chroot/(var/)?run/named|/var/named/chroot/var/log|/var/named/chroot/(var/)?tmp|/var/cache/bind|/run/named|/var/run/named)(/|$)'
out=$({ find $BH -type d -perm /020 -print 2>/dev/null | { grep -Ev "$RT" || true; }; find $BH -type f -perm /020 -print 2>/dev/null | { grep -Ev "$RT" || true; }; }) || exit 1
[ -z "$out" ] && echo compliant || { printf '%s\n' "$out" | head -n 20; echo 'group-writable BIND files or directories'; }

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

Perform the following: ; Capture the output from the audit commands above into a file named write- dirs.txt ; Review the purpose for the identified directories and either delete them if the directory is not needed, or change the permissions of the directory to not be writable by group or other. ; The following command can be used to change the permissions of the directories that are appropriate. xargs -a write-dirs.txt chmod g-w

屬性

作業系統: 不限
標籤: binddnspermissions
參考資料: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 2.7 Set Group Read-Only for BIND Files and Non-Runtime Directories

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