SV-258133r1045263: RHEL 9 must prohibit the use of cached authenticators after one day. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must prohibit the use of cached authenticators after one day.

Description

Discussion Text

If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002007

References

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

Checks

DISA STIG (Manual Reference)

Verify that the System Security Services Daemon (SSSD) prohibits the use of cached authentications after one day.

Note: Cached authentication settings should be configured even if smart card authentication is not used on the system.

Check that SSSD allows cached authentications with the following command:

$ sudo grep -ir cache_credentials /etc/sssd/sssd.conf /etc/sssd/conf.d/

cache_credentials = true

If "cache_credentials" is set to "false" or missing from the configuration file, this is not a finding and no further checks are required.

If "cache_credentials" is set to "true", check that SSSD prohibits the use of cached authentications after one day with the following command:

$ sudo grep -ir offline_credentials_expiration /etc/sssd/sssd.conf /etc/sssd/conf.d/

offline_credentials_expiration = 1

If "offline_credentials_expiration" is not set to a value of "1", 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:258133
# RHEL 9 must prohibit the use of cached authenticators after one day.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/sssd/sssd.conf:cache_credentials = true does not exist
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( ! ( grep -Pq '^\s*cache_credentials\s*=\s*true\b$' '/etc/sssd/sssd.conf' &>/dev/null ) ) || ( ! ( grep -rqP --include='*.conf' '^\s*cache_credentials\s*=\s*true\b$' '/etc/sssd/conf.d' &>/dev/null ) )
}
# /etc/sssd/sssd.conf:offline_credentials_expiration = 1
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ( [ "$(sed -En 's/^\s*offline_credentials_expiration\s*=\s*(\d*)\s*(?:#.*)?$/\1/p' '/etc/sssd/sssd.conf')" -eq 1 ] ) || ( [ "$(grep -rhP --include='*.conf' '^\s*offline_credentials_expiration\s*=\s*(\d*)\s*(?:#.*)?$' '/etc/sssd/conf.d' | sed -En 's/^\s*offline_credentials_expiration\s*=\s*(\d*)\s*(?:#.*)?$/\1/p')" -eq 1 ] )
}

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:258133

if ! grep -q '^\\s*cache_credentials\\s*=\\s*true\\b' /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf && \
    (grep -q '^\\s*offline_credentials_expiration\\s*=\\s*1\\s*' /etc/sssd/sssd.conf || grep -q '^\\s*offline_credentials_expiration\\s*=\\s*1\\s*' /etc/sssd/conf.d/*.conf); then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure the SSSD to prohibit the use of cached authentications after one day.

Edit the file "/etc/sssd/sssd.conf" or a configuration file in "/etc/sssd/conf.d" and add or edit the following line just below the line [pam]:

offline_credentials_expiration = 1