SV-230376r1069307: RHEL 8 must prohibit the use of cached authentications after one day. | Red Hat Enterprise Linux 8 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 8 must prohibit the use of cached authentications after one day.

Description

Discussion Text

If cached authentication information is out-of-date, the validity of the authentication information may be questionable. RHEL 8 includes multiple options for configuring authentication, but this requirement will be focus on the System Security Services Daemon (SSSD). By default sssd does not cache credentials.

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 8 DISA DPMS Target Red Hat Enterprise Linux 8 2921

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.rhel8os:def:230376
# RHEL 8 must prohibit the use of cached authentications 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:mil.disa.stig.rhel8os:def:230376
if ! grep -q '^\\s*cache_credentials\\s*=\\s*true\\b$' /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf; then
    if grep -q '^\\s*offline_credentials_expiration\\s*=\\s*1\\s*$' /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf; then
        echo "PASS"
        exit 0
    fi
fi
echo "FAIL"
exit 1

Remediation

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

Add or change the following line in "/etc/sssd/sssd.conf" just below the line "[pam]".

     offline_credentials_expiration = 1