TMA-KERBEROS-KDC-DB-PERMS

Ensure the KDC database and master key stash are accessible only by root

CríticaNivel 1Automatizadakerberos

Descripción

The principal database and the stash file (.k5.<REALM>) together expose every long-term key in the realm. The audit inspects the KDC state directory (/var/lib/krb5kdc on Debian/Ubuntu, /var/kerberos/krb5kdc on RHEL) and fails if any principal* or .k5.* file has group or other permissions or is not owned by root.

Cómo se verifica

Método de auditoría: Comando de shell

shell

n=0
for d in /var/lib/krb5kdc /var/kerberos/krb5kdc; do
  [ -d "$d" ] || continue
  n=$((n+1))
  bad=$(find "$d" -maxdepth 1 -type f \( -name 'principal*' -o -name '.k5.*' \) \( -perm /077 -o ! -user root \) 2>/dev/null) || exit 1
  [ -z "$bad" ] || { printf '%s\n' "$bad"; exit 1; }
done
[ "$n" -gt 0 ] && echo compliant

Salida esperada: compliant

Cómo se corrige

Método de corrección: Comando de shell

shell

for d in /var/lib/krb5kdc /var/kerberos/krb5kdc; do if [ -d "$d" ]; then find "$d" -maxdepth 1 -type f \( -name 'principal*' -o -name '.k5.*' \) -exec chown root:root {} + -exec chmod 600 {} + || exit 1; fi; done

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: kerberoskdcpermissionskeys
Referencia: CIS MIT Kerberos / Linux Benchmark guidance - KDC database and stash file protection (verify section number for your release)

Verificar este host

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

shell

tmaegis scan --target kerberos