1.8.8 Ensure GDM autorun-never is enabled

[scfast]

Profile Applicability:  Level 1 - Server  Level 1 - Workstation

Description: The autorun-never setting allows the GNOME Desktop Display Manager to disable autorun through GDM.

Rationale: Malware on removable media may taking advantage of Autorun features when the media is inserted into a system and execute.

Audit: Run the following script to verify that autorun-never is set to true for GDM:

#!/usr/bin/env bash
{
l_pkgoutput="" l_output="" l_output2=""
# Check if GNOME Desktop Manager is installed. If package isn't
installed, recommendation is Not Applicable\n
# determine system's package manager
if command -v dpkg-query > /dev/null 2>&1; then
l_pq="dpkg-query -W"
elif command -v rpm > /dev/null 2>&1; then
l_pq="rpm -q"
fi
# Check if GDM is installed
l_pcl="gdm gdm3" # Space separated list of packages to check
for l_pn in $l_pcl; do
$l_pq "$l_pn" > /dev/null 2>&1 && l_pkgoutput="$l_pkgoutput\n -
Package: \"$l_pn\" exists on the system\n - checking configuration"
echo -e "$l_pkgoutput"
done
# Check configuration (If applicable)
if [ -n "$l_pkgoutput" ]; then
echo -e "$l_pkgoutput"
# Look for existing settings and set variables if they exist
l_kfile="$(grep -Prils -- '^\h*autorun-never\b' /etc/dconf/db/*.d)"
# Set profile name based on dconf db directory ({PROFILE_NAME}.d)
if [ -f "$l_kfile" ]; then
l_gpname="$(awk -F\/ '{split($(NF-1),a,".");print a[1]}' <<<
"$l_kfile")"
fi
# If the profile name exist, continue checks
if [ -n "$l_gpname" ]; then
l_gpdir="/etc/dconf/db/$l_gpname.d"
# Check if profile file exists
if grep -Pq -- "^\h*system-db:$l_gpname\b" /etc/dconf/profile/*;
then
l_output="$l_output\n - dconf database profile file \"$(grep -Pl
-- "^\h*system-db:$l_gpname\b" /etc/dconf/profile/*)\" exists"
else
l_output2="$l_output2\n - dconf database profile isn't set"
fi
# Check if the dconf database file exists
if [ -f "/etc/dconf/db/$l_gpname" ]; then
l_output="$l_output\n - The dconf database \"$l_gpname\" exists"
else
l_output2="$l_output2\n - The dconf database \"$l_gpname\"
doesn't exist"
fi
# check if the dconf database directory exists
if [ -d "$l_gpdir" ]; then
l_output="$l_output\n - The dconf directory \"$l_gpdir\" exitst"
else
l_output2="$l_output2\n - The dconf directory \"$l_gpdir\"
doesn't exist"
fi
# check autorun-never setting
if grep -Pqrs -- '^\h*autorun-never\h*=\h*true\b' "$l_kfile"; then
l_output="$l_output\n - \"autorun-never\" is set to true in:
\"$l_kfile\""
else
l_output2="$l_output2\n - \"autorun-never\" is not set correctly"
fi
else
# Settings don't exist. Nothing further to check
l_output2="$l_output2\n - \"autorun-never\" is not set"
fi
else
l_output="$l_output\n - GNOME Desktop Manager package is not installed
on the system\n - Recommendation is not applicable"
fi
# Report results. If no failures output in l_output2, we pass
if [ -z "$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
}

Default Value: false