feat: add debian12 scripts

- nftables_loopback_is_configured.sh 	-> 4.2.6
- nftables_established_connections.sh 	-> 4.2.7
- iptables_flushed_with_nftables.sh 	-> 4.2.3
- ufw_loopback_is_configured.sh 	-> 4.1.4
- ufw_outbound_connection.sh 		-> 4.1.5
- ufw_default_deny.sh 			-> 4.1.7
- ufw_rules_them_all.sh 		-> 4.1.6

bin/hardening/ufw_rules_them_all.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure ufw firewall rules exist for all open ports (Manual)
+#
+
+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 ufw firewall rules exist for all open ports"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    UFW_IS_VALID=0
+    local ufw_ports_rules
+    local listening_ports
+
+    ufw_ports_rules=$($SUDO_CMD ufw status verbose 2>/dev/null | grep -Po '^\h*\d+\b' | sort -u)
+    listening_ports=$($SUDO_CMD ss -tuln | awk '($5!~/%lo:/ && $5!~/127.0.0.1:/ && $5!~/\[?::1\]?:/) {split($5, a, ":"); print a[2]}' | sort -u)
+
+    for port in $listening_ports; do
+        if ! grep "$port" <<<"$ufw_ports_rules"; then
+            crit "$port does not have an ufw rule"
+            UFW_IS_VALID=1
+        fi
+    done
+
+    if [ "$UFW_IS_VALID" -eq 0 ]; then
+        ok "all listening ports have a corresponding rule in ufw"
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    if [ "$UFW_IS_VALID" -ne 0 ]; then
+        # Debian 12 CIS marks this script as "Automated", but we wont do it
+        # How can we know if a rule should be allowed or denied ?
+        warn "Please review the ufw rules and update them accordingly"
+    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