Ensure permissions on /etc/shells are configured

보통레벨 1자동freebsd

설명

/etc/shells is a text file that contains the full pathnames of valid login shells. This file is consulted by chsh and is available to be queried by other programs. It is critical to protect the /etc/shells file from unauthorized access. Although it is protected by default, the file permissions could be changed inadvertently or through malicious actions. Audit: compares `ls -ld` mode (this mode or more restrictive), owner and group with the CIS values.

점검 방법

감사 방식: 셸 명령

shell

r=compliant; for f in /etc/shells; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='rw-r--r--' -v o='root' -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; echo "$r"

예상 출력: compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

Run the following commands to remove excess permissions, set owner, and set group on /etc/shells: # chmod u-x,go-wx /etc/shells # chown root:wheel /etc/shells

속성

운영 체제: 모두
태그: freebsdpermissions
참고 자료: CIS FreeBSD 14 Benchmark v1.0.1 - 6.1.4 Ensure permissions on /etc/shells are configured

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shell

tmaegis scan --target freebsd