feat: add new scripts for debian 12

- tftp_is_disabled              ->      2.1.16
- network_services_listening    ->      2.1.22
- use_time_sync                 ->      2.3.1.1
Update the existing script to check there is only one installed

- chrony_is_enabled_and_running ->      2.3.3.3

bin/hardening/tftp_is_disabled.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure tftp services are not in use (Automated)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=3
+# shellcheck disable=2034
+DESCRIPTION="Ensure tftp services are not in use."
+PACKAGE='tftpd-hpa'
+SERVICE="tftpd-hpa.service"
+
+# 2 scenario here:
+# - tftp is a dependency for another package -> disable the service
+# - tftp is not a dependency for another package -> remove the package
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    # 0 means true in bash
+    PACKAGE_INSTALLED=1
+    PACKAGE_IS_DEPENDENCY=1
+    SERVICE_ENABLED=1
+
+    is_pkg_installed "$PACKAGE"
+    [ "$FNRET" = 0 ] && PACKAGE_INSTALLED=0 # 0 means true in bash
+
+    is_pkg_a_dependency "$PACKAGE"
+    # dnsmasq is installed with dnsmasq-base, which
+    [ "$FNRET" = 0 ] && PACKAGE_IS_DEPENDENCY=0
+
+    is_service_enabled "$SERVICE"
+    [ "$FNRET" = 0 ] && SERVICE_ENABLED=0
+
+    if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
+        crit "$PACKAGE is installed and not a dependency"
+    elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ]; then
+        crit "$SERVICE is enabled"
+    else
+        ok "$PACKAGE is not in use"
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    audit
+    if [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 1 ]; then
+        crit "$PACKAGE is installed and not a dependency, removing it"
+        apt-get purge "$PACKAGE" -y
+        apt-get autoremove -y
+    elif [ "$PACKAGE_INSTALLED" -eq 0 ] && [ "$PACKAGE_IS_DEPENDENCY" -eq 0 ] && [ "$SERVICE_ENABLED" -eq 0 ] && [ "$IS_CONTAINER" -eq 1 ]; then
+        crit "$SERVICE is enabled, i'm going to stop and mask it"
+        systemctl stop "$SERVICE"
+        systemctl mask "$SERVICE"
+    else
+        ok "$PACKAGE is not in use"
+    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