Ensure crontab is restricted to authorized users

Cómo se verifica

Método de auditoría: Comando de shell

r=compliant; for f in /var/cron/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' -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/cron/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' -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"

Salida esperada

compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

-IF- cron is installed on the system: Run the following commands to: Create /var/cron/allow if it doesn't exist Change owner or user root Change group owner to group wheel Change mode to 640 or more restrictive # [ ! -e "/var/cron/allow" ] && touch /var/cron/allow # chown root:wheel /var/cron/allow # chmod u-x,g-wx,o-rwx /var/cron/allow Run the following commands to: -IF- /var/cron/deny exists: Change owner or user root Change group owner to group wheel Change mode to 640 or more restrictive # [ -e "/var/cron/deny" ] && chown root:wheel /var/cron/deny # [ -e "/var/cron/deny" ] && chmod u-x,g-wx,o-rwx /var/cron/deny

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

tmaegis scan --target freebsd