Ensure at is restricted to authorized users

ÉlevéeNiveau 1Automatiséefreebsd

Description

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.

Méthode de vérification

Méthode d'audit: Commande shell

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"

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

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 }

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: freebsdaccounts
Référence: CIS FreeBSD 14 Benchmark v1.0.1 - 4.1.2.1 Ensure at is restricted to authorized users

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target freebsd