Ensure GDM automount is configured

MediumLevel 1Automatedlinux

Description

By default GNOME automatically mounts removable media when inserted as a convenience to the user. By using the lockdown mode in dconf, you can prevent users from changing specific settings.

How it is checked

Audit method: Shell command

shell

alt0() { command -v gsettings >/dev/null 2>&1 || { echo "step1: gsettings not installed"; return 1; }; o=$(bash -c 'gsettings writable org.gnome.desktop.media-handling automount' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- false || { echo step1: missing false; return 1; }; command -v gsettings >/dev/null 2>&1 || { echo "step2: gsettings not installed"; return 1; }; o=$(bash -c 'gsettings writable org.gnome.desktop.media-handling automount-open' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- false || { echo step2: missing false; return 1; }; command -v gsettings >/dev/null 2>&1 || { echo "step3: gsettings not installed"; return 1; }; o=$(bash -c 'gsettings get org.gnome.desktop.media-handling automount' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- false || { echo step3: missing false; return 1; }; command -v gsettings >/dev/null 2>&1 || { echo "step4: gsettings not installed"; return 1; }; o=$(bash -c 'gsettings get org.gnome.desktop.media-handling automount-open' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- false || { echo step4: missing false; return 1; }; }; if alt0; then echo compliant; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

1. Create or edit the file /etc/dconf/profile/user and add the following lines if they do not exist: user-db:user system-db:local Example: #!/usr/bin/env bash { l_dir="/etc/dconf/profile/" [ ! -d "$l_dir" ] && mkdir /etc/dconf/profile/ ! grep -Psq '^\h*user-db:user\b' "$l_dir/user" && \ printf '%s\n' "" "user-db:user" >> "$l_dir/user" ! grep -Psq '^\h*system-db:local\b' "$l_dir/user" && \ sed -ri '/^\s*user-db:user/a system-db:local' "$l_dir/user" } 2. Run the following command to create the /etc/dconf/db/local.d/ and /etc/dconf/db/local.d/locks/ directories if either does not exist: # [ ! -d "/etc/dconf/db/local.d/locks/" ] && mkdir -p /etc/dconf/db/local.d/locks/ 3. Create or edit a file i…

Properties

Operating systems: rocky-8
Tags: cis-convertedlinux
Reference: CIS Rocky Linux 8 Benchmark v3.0.0 - 1.8.4

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target linux