Set Other Permissions Read-Only for All BIND Directories and Files

中级别 1自动化bind

说明

All the directories and files in BIND home and run time directories should have other permissions set to not be writable. Configuration files should, of course, not be writable by named, and any run time files created by BIND will be owned by named and writable by the user. A chroot'ed tmp directory only needs to be writable by the named group. The audit lists regular files and directories under $BIND_HOME and $RUNDIR writable by other 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 $RUN \( -type f -o -type d \) -perm /002 -print 2>/dev/null) || exit 1
[ -z "$out" ] && echo compliant || { printf '%s\n' "$out" | head -n 20; echo 'other-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 with the name $TMPDIR/write-files.txt ; Review the purpose for the identified files and either delete them if the file is not needed, or change the permissions of the file to not be writable by group or other. ; The following commands can be used to change the permissions of the appropriate files. # find $BIND_HOME $RUNDIR -type f -perm /022 > $TMPDIR/write-files.txt # xargs -a $TMPDIR/write-files.txt chmod go-w # rm $TMPDIR/write-files.txt

属性

操作系统: 任意
标签: binddnspermissions
参考: CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 2.8 Set Other Permissions Read-Only for All BIND Directories and Files

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