SV-258030r1045112: RHEL 9 must prevent a user from overriding the disable-restart-buttons setting for the graphical user interface. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must prevent a user from overriding the disable-restart-buttons setting for the graphical user interface.

Description

Discussion Text

A user who is at the console can reboot the system at the login screen. If restart or shutdown buttons are pressed at the login screen, this can create the risk of short-term loss of availability of systems due to reboot.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

Checks

DISA STIG (Manual Reference)

Note: This requirement assumes the use of the RHEL 9 default graphical user interface, the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is Not Applicable.

Verify RHEL 9 prevents a user from overriding the disable-restart-buttons setting for graphical user interfaces. 

$ gsettings writable org.gnome.login-screen disable-restart-buttons
 
false
 
If "disable-restart-buttons" is writable and the result is "true", this is a finding.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.rhel9os:def:258030
# RHEL 9 must prevent a user from overriding the disable-restart-buttons setting for the graphical user interface.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# check that /etc/dconf/profile/user:system-db is at minimum set to local
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^\s*system-db\s*:\s*local\s*$' '/etc/dconf/profile/user' &>/dev/null
}
# Check that the disable-restart-button setting is locked from nonprivileged user modification
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^\s*\/org\/gnome\/login-screen\/disable-restart-buttons$' '/etc/dconf/db/local.d/locks' &>/dev/null
}

if ( test_1 && test_2 ); then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.stig.rhel9os:def:258030

if [ ! -f "/etc/dconf/profile/user" ]; then echo "FAIL"; exit 1; fi
if ! grep -q "^\\s*system-db\\s*:\\s*local\\s*$" /etc/dconf/profile/user; then echo "FAIL"; exit 1; fi
if [ ! -d "/etc/dconf/db/local.d/locks" ]; then echo "FAIL"; exit 1; fi
if ! grep -q "^\\s*\\/org\\/gnome\\/login-screen\\/disable-restart-buttons$" "/etc/dconf/db/local.d/locks/.*"; then echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

Configure RHEL 9 to prevent a user from overriding the disable-restart-buttons setting for graphical user interfaces. 

Create a database to contain the systemwide graphical user logon settings (if it does not already exist) with the following command:

$ sudo touch /etc/dconf/db/local.d/locks/session

Add the following line to prevent nonprivileged users from modifying it:

/org/gnome/login-screen/disable-restart-buttons

Run the following command to update the database:

$ sudo dconf update