#!/bin/bash { l_output="" l_output2="" l_output3="" l_dl="" # Unset output variables l_mname="squashfs" # set module name l_mtype="fs" # set module type l_searchloc="/lib/modprobe.d/*.conf /usr/local/lib/modprobe.d/*.conf /run/modprobe.d/*.conf /etc/modprobe.d/*.conf" l_mpath="/lib/modules/**/kernel/$l_mtype" l_mpname="$(tr '-' '_' <<< "$l_mname")" l_mndir="$(tr '-' '/' <<< "$l_mname")" module_loadable_chk() { # Check if the module is currently loadable l_loadable="$(modprobe -n -v "$l_mname")" [ "$(wc -l <<< "$l_loadable")" -gt "1" ] && l_loadable="$(grep -P -- "(^\h*install|\b$l_mname)\b" <<< "$l_loadable")" 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: \"$l_loadable\"" fi } module_loaded_chk() { # Check if the module is currently loaded if ! lsmod | grep "$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 } module_deny_chk() { # Check if the module is deny listed l_dl="y" if modprobe --showconfig | grep -Pq -- '^\h*blacklist\h+'"$l_mpname"'\b'; then l_output="$l_output\n - module: \"$l_mname\" is deny listed in: \"$(grep -Pls -- "^\h*blacklist\h+$l_mname\b" $l_searchloc)\"" else l_output2="$l_output2\n - module: \"$l_mname\" is not deny listed" fi } # Check if the module exists on the system for l_mdir in $l_mpath; do if [ -d "$l_mdir/$l_mndir" ] && [ -n "$(ls -A $l_mdir/$l_mndir)" ]; then l_output3="$l_output3\n - \"$l_mdir\"" [ "$l_dl" != "y" ] && module_deny_chk if [ "$l_mdir" = "/lib/modules/$(uname -r)/kernel/$l_mtype" ]; then module_loadable_chk module_loaded_chk fi else l_output="$l_output\n - module: \"$l_mname\" doesn't exist in \"$l_mdir\"" fi done # Report results. If no failures output in l_output2, we pass [ -n "$l_output3" ] && echo -e "\n\n -- INFO --\n - module: \"$l_mname\" exists in:$l_output3" 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 }

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Revision 1.15

Mar 7, 2024

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