#!/usr/bin/env bash
{
    l_output="" l_output2=""
    l_mname="squashfs" # set module name
    # Check how module will be loaded
    l_loadable="$(modprobe -n -v "$l_mname")"
    if grep -Pq -- '^\h*install \/bin\/(true|false)' <<<"$l_loadable"; then
        l_output="$l_output\n - module: \"$l_mname\" is not loadable: \"$l_loadable\""
    else
        l_output2="$l_output2\n - module: \"$l_mname\" is loadable: \"$l_loadable\""
    fi
    # Check is the module currently loaded
    if ! lsmod | grep "$l_mname" >/dev/null 2>&1; then
        l_output="$l_output\n - module: \"$l_mname\" is not loaded"
    else
        l_output2="$l_output2\n - module: \"$l_mname\" is loaded"
    fi
    # Check if the module is deny listed
    if grep -Pq -- "^\h*blacklist\h+$l_mname\b" /etc/modprobe.d/*; then
        l_output="$l_output\n - module: \"$l_mname\" is deny listed in: \"$(grep -Pl -- "^\h*blacklist\h+$l_mname\b" /etc/modprobe.d/*)\""
    else
        l_output2="$l_output2\n - module: \"$l_mname\" is not deny listed"
    fi
    # Report results. If no failures output in l_output2, we pass
    if [ -z "$l_output2" ]; then
        echo -e "\n- Audit Result:\n ** PASS **\n$l_output\n"
    else
        echo -e "\n- Audit Result:\n ** FAIL **\n - Reason(s) for audit failure:\n$l_output2\n"
        [ -n "$l_output" ] && echo -e "\n- Correctly set:\n$l_output\n"
    fi
}