Ensure at is restricted to authorized users

高レベル 1自動freebsd

説明

The at utility allows some moderately complex time specifications. It accepts times of the form HHMM or HH:MM to run a job at a specific time of day. On many systems, only the system administrator is authorized to schedule at jobs. Using the at.allow file to control who can run at jobs enforces this policy. It is easier to manage an allow list than a deny list. Audit: /var/at/at.allow must exist with mode 640 or stricter, owner root or daemon, group wheel; at.deny must be absent or equally restricted.

チェック方法

監査方法: シェルコマンド

shell

r=compliant; for f in /var/at/at.allow; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='rw-r-----' -v o='root|daemon' -v g='wheel' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else r="$f: missing"; fi; done; for f in /var/at/at.deny; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='rw-r-----' -v o='root|daemon' -v g='wheel' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; echo "$r"

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

Run the following script to: /var/at/at.allow: o Create the file if it doesn't exist o Change owner or user root or daemon o Change group to wheel o Change mode to 640 or more restrictive -IF- /var/at/at.deny exists: o Change owner or user root o Change group to wheel o Change mode to 640 or more restrictive #!/bin/sh { [ ! -e "/var/at/at.allow" ] && touch /var/at/at.allow chown root:wheel /var/at/at.allow chmod u-x,g-wx,o-rwx /var/at/at.allow [ -e "/var/at/at.deny" ] && chown root:wheel /var/at/at.deny [ -e "/var/at/at.deny" ] && chmod u-x,g-wx,o-rwx /var/at/at.deny }

プロパティ

オペレーティングシステム: すべて
タグ: freebsdaccounts
参照: CIS FreeBSD 14 Benchmark v1.0.1 - 4.1.2.1 Ensure at is restricted to authorized users

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target freebsd