Disable WIFI Network Notification in GNOME3

An XCCDF Rule

Description

By default, GNOME disables WIFI notification. This should be permanently set so that users do not connect to a wireless network when the system finds one. While useful for mobile devices, this setting should be disabled for all other systems. To configure the system to disable the WIFI notication, add or set suppress-wireless-networks-available to true in /etc/dconf/db/local.d/00-security-settings. For example:

[org/gnome/nm-applet]
suppress-wireless-networks-available=true

Once the settings have been added, add a lock to /etc/dconf/db/local.d/locks/00-security-settings-lock to prevent user modification. For example:

/org/gnome/nm-applet/suppress-wireless-networks-available

After the settings have been set, run dconf update.

Rationale

Wireless network connections should not be allowed to be configured by general users on a given system as it could open the system to backdoor attacks.

ID: xccdf_org.ssgproject.content_rule_dconf_gnome_disable_wifi_notification
Severity: Medium
References: 3.1.16

CCE-80119-1
Updated: about 1 year ago

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - CCE-80119-1
  - NIST-800-171-3.1.16  - dconf_gnome_disable_wifi_notification
  - low_complexity
  - medium_disruption
  - medium_severity
  - no_reboot_needed
  - unknown_strategy

- name: Disable WiFi Network Notification in GNOME3
  ini_file:
    dest: /etc/dconf/db/local.d/00-security-settings
    section: org/gnome/nm-applet
    option: suppress-wireless-networks-available
    value: 'true'
    create: true
    no_extra_spaces: true
  when:
  - '"gdm" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-80119-1
  - NIST-800-171-3.1.16
  - dconf_gnome_disable_wifi_notification
  - low_complexity
  - medium_disruption
  - medium_severity
  - no_reboot_needed
  - unknown_strategy

- name: Prevent user modification of GNOME3 disablement of WiFi
  lineinfile:
    path: /etc/dconf/db/local.d/locks/00-security-settings-lock
    regexp: ^/org/gnome/nm-applet/suppress-wireless-networks-available$
    line: /org/gnome/nm-applet/suppress-wireless-networks-available
    create: true
  when:
  - '"gdm" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-80119-1
  - NIST-800-171-3.1.16
  - dconf_gnome_disable_wifi_notification
  - low_complexity
  - medium_disruption
  - medium_severity
  - no_reboot_needed
  - unknown_strategy

- name: Dconf Update
  command: dconf update
  when:
  - '"gdm" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-80119-1
  - NIST-800-171-3.1.16
  - dconf_gnome_disable_wifi_notification
  - low_complexity
  - medium_disruption
  - medium_severity
  - no_reboot_needed
  - unknown_strategy

# Remediation is applicable only in certain platforms
if rpm --quiet -q gdm && { [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; }; then

# Check for setting in any of the DConf db directories
# If files contain ibus or distro, ignore them.
# The assignment assumes that individual filenames don't contain :readarray -t SETTINGSFILES < <(grep -r "\\[org/gnome/nm-applet\\]" "/etc/dconf/db/" \
                                | grep -v 'distro\|ibus\|local.d' | cut -d":" -f1)
DCONFFILE="/etc/dconf/db/local.d/00-security-settings"
DBDIR="/etc/dconf/db/local.d"

mkdir -p "${DBDIR}"

# Comment out the configurations in databases different from the target one
if [ "${#SETTINGSFILES[@]}" -ne 0 ]
then
    if grep -q "^\\s*suppress-wireless-networks-available\\s*=" "${SETTINGSFILES[@]}"
    then
        
        sed -Ei "s/(^\s*)suppress-wireless-networks-available(\s*=)/#\1suppress-wireless-networks-available\2/g" "${SETTINGSFILES[@]}"
    fi
fi

[ ! -z "${DCONFFILE}" ] && echo "" >> "${DCONFFILE}"
if ! grep -q "\\[org/gnome/nm-applet\\]" "${DCONFFILE}"
then
    printf '%s\n' "[org/gnome/nm-applet]" >> ${DCONFFILE}
fi

escaped_value="$(sed -e 's/\\/\\\\/g' <<< "true")"
if grep -q "^\\s*suppress-wireless-networks-available\\s*=" "${DCONFFILE}"
then
        sed -i "s/\\s*suppress-wireless-networks-available\\s*=\\s*.*/suppress-wireless-networks-available=${escaped_value}/g" "${DCONFFILE}"
    else
        sed -i "\\|\\[org/gnome/nm-applet\\]|a\\suppress-wireless-networks-available=${escaped_value}" "${DCONFFILE}"
fi

dconf update
# Check for setting in any of the DConf db directories
LOCKFILES=$(grep -r "^/org/gnome/nm-applet/suppress-wireless-networks-available$" "/etc/dconf/db/" \
            | grep -v 'distro\|ibus\|local.d' | grep ":" | cut -d":" -f1)
LOCKSFOLDER="/etc/dconf/db/local.d/locks"

mkdir -p "${LOCKSFOLDER}"

# Comment out the configurations in databases different from the target one
if [[ ! -z "${LOCKFILES}" ]]
then
    sed -i -E "s|^/org/gnome/nm-applet/suppress-wireless-networks-available$|#&|" "${LOCKFILES[@]}"
fi

if ! grep -qr "^/org/gnome/nm-applet/suppress-wireless-networks-available$" /etc/dconf/db/local.d/
then
    echo "/org/gnome/nm-applet/suppress-wireless-networks-available" >> "/etc/dconf/db/local.d/locks/00-security-settings-lock"
fi

dconf update

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Disable WIFI Network Notification in GNOME3

Description

Rationale

Remediation - Ansible

Remediation - Shell Script