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

中级别 1自动化bind

说明

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.

检查方式

审计方法: Shell 命令

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'; }

预期输出: compliant

修复方式

修复方法: 操作指南或基础设施补丁

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

属性

操作系统: 任意
标签: binddnspermissions
参考: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 2.7 Set Group Read-Only for BIND Files and Non-Runtime Directories

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