SV-204403r958402: The Red Hat Enterprise Linux operating system must prevent a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must prevent a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface.

Description

Discussion Text

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. The ability to enable/disable a session lock is given to the user by default. Disabling the user's ability to disengage the graphical user interface session lock provides the assurance that all sessions will lock after the specified period of time.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000057V-78997SV-93703

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify the operating system prevents a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface. 

Note: If the system does not have GNOME installed, this requirement is Not Applicable.

Determine which profile the system database is using with the following command:
     # grep system-db /etc/dconf/profile/user

     system-db:local

Check for the idle-activation-enabled setting with the following command:

Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used.

     # grep -i idle-activation-enabled /etc/dconf/db/local.d/locks/*

     /org/gnome/desktop/screensaver/idle-activation-enabled

If the command does not return a result, 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.rhel7:def:93703
# The Red Hat Enterprise Linux operating system must prevent a user from overriding the screensaver idle-activation-enabled 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.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - textfilecontent54_object (textfilecontent54_test) -- idle-activation-enabled setting exists: cannot derive an existence probe for this object type
#   - textfilecontent54_object (textfilecontent54_test) -- idle-activation-enabled lock exists: cannot derive an existence probe for this object type
#   - textfilecontent54_object (textfilecontent54_test) -- all idle-activation-enabled entries are locked: <set> composition (base object oval:mil.disa.stig.rhel7:obj:9370300): member unresolved -- cannot derive an existence probe for this object type

# package dconf is installed
# rpminfo_object (rpminfo_test)
test_1() {
  rpm -q --quiet 'dconf' &>/dev/null
}

if test_1; then
  echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
  echo "FAIL (or see MANUAL REVIEW note above)"
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:mil.disa.stig.rhel7:def:93703

if ! command -v rpm &> /dev/null; then
  echo "FAIL"
  exit 1
fi

if [ ! -f "/etc/dconf/db/local.d/locks/session" ]; then
  touch "/etc/dconf/db/local.d/locks/session"
fi

if grep -q "^\\[org/gnome/desktop/screensaver\\]([^\\n]*\\n+)+?idle-activation-enabled\\s*=\\s*(?:true|false)\\s*$" /etc/dconf/db/local.d/*.d/*; then
  if grep -q "^/org/gnome/desktop/screensaver/idle-activation-enabled\\s*$" /etc/dconf/db/local.d/locks/session; then
    echo "PASS"
    exit 0
  else
    echo "FAIL"
    exit 1
  fi
else
  echo "PASS"
  exit 0
fi

Remediation

Configure the operating system to prevent a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces.

Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: 

Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.

     # touch /etc/dconf/db/local.d/locks/session

Add the setting to lock the screensaver idle-activation-enabled setting:

     /org/gnome/desktop/screensaver/idle-activation-enabled