Ensure at is restricted to authorized users

AltaNivel 1Automatizadafreebsd

Descripción

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.

Cómo se verifica

Método de auditoría: Comando de 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"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

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 }

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: freebsdaccounts
Referencia: CIS FreeBSD 14 Benchmark v1.0.1 - 4.1.2.1 Ensure at is restricted to authorized users

Verificar este host

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

shell

tmaegis scan --target freebsd