feat: add debian12 scripts

- nftables_is_enabled.sh 	-> 4.2.9
- nftables_has_table.sh 	-> 4.2.4
- nftables_has_base_chains.sh 	-> 4.2.5

bin/hardening/nftables_has_table.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure a nftables table exists (Automated)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=2
+# shellcheck disable=2034
+DESCRIPTION="Ensure a nftables table exists"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    NFTABLES_HAS_TABLES=0
+    local tables
+    tables=$(nft list tables | wc -l)
+    if [ "$tables" -eq 0 ]; then
+        crit "There are no nft tables"
+        NFTABLES_HAS_TABLES=1
+    else
+        ok "There are $tables nft tables"
+    fi
+
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    audit
+    if [ "$NFTABLES_HAS_TABLES" -eq 1 ]; then
+        info "Adding 'filter' nft table"
+        nft create table inet filter
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+
+if [ -z "$CIS_LIB_DIR" ]; then
+    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+    echo "Cannot source CIS_LIB_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
+    # shellcheck source=../../lib/main.sh
+    . "${CIS_LIB_DIR}"/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
+    exit 128
+fi