SV-281224r1273597: RHEL 10 must display the Standard Mandatory DoW Notice and Consent Banner before granting local or remote access to the system via a Secure Shell (SSH) login. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must display the Standard Mandatory DoW Notice and Consent Banner before granting local or remote access to the system via a Secure Shell (SSH) login.

Description

Discussion Text

The warning message reinforces policy awareness during the login process and facilitates possible legal action against attackers. Alternatively, systems whose ownership should not be obvious should ensure use of a banner that does not provide easy attribution. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000213

References

DPMS Target Red Hat Enterprise Linux 10 DISA DPMS Target Red Hat Enterprise Linux 10 5733

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.rhel10os:def:281224
# RHEL 10 must display the Standard Mandatory DoW Notice and Consent Banner before granting local or remote access to the system via a Secure Shell (SSH) login.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/ssh/sshd_config:banner == /filepath
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( (sed -En 's/^\s*(?i)banner(?-i)[ \t\"]+([\w\\/]+)[\"\s]*(?:|(?:#.*))?$/\1/p' '/etc/ssh/sshd_config') | grep -Pq '^\/.+$' ) || ( (grep -rhP --include='*' '^\s*(?i)banner(?-i)[ \t\"]+([\w\/]+)[\"\s]*(?:|(?:#.*))?$' '/etc/ssh/sshd_config.d' | sed -En 's/^\s*(?i)banner(?-i)[ \t\"]+([\w\\/]+)[\"\s]*(?:|(?:#.*))?$/\1/p') | grep -Pq '^\/.+$' )
}
# /etc/ssh/sshd_config:banner != none
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ( ! ( grep -Pq '^\s*(?i)banner(?-i)[ \t]*(?:none[\s]*|(?:#.*))?$' '/etc/ssh/sshd_config' &>/dev/null ) ) || ( ! ( grep -rqP --include='*' '^\s*(?i)banner(?-i)[ \t]*(?:none[\s]*|(?:#.*))?$' '/etc/ssh/sshd_config.d' &>/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:mil.disa.stig.rhel10os:def:281224

if [ ! -f "/etc/ssh/sshd_config" ]; then echo "PASS"; exit 0; fi
if grep -q "^\\s*(?i)banner(?-i)[ \\t\\\"]+([\\w\\/]+)[\\\"\\s]*(?:|(?:#.*))?$" /etc/ssh/sshd_config || \
   grep -q "^\\s*(?i)banner(?-i)[ \\t\\\"]+([\\w\\/]+)[\\\"\\s]*(?:|(?:#.*))?$" $(find /etc/ssh/sshd_config.d -type f); then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure RHEL 10 to display the Standard Mandatory DoW Notice and Consent Banner before granting access to the system via SSH.

Edit a file in "/etc/ssh/sshd_config.d" to uncomment or add the banner keyword and configure it to point to a file that will contain the login banner (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor).

An example configuration line is:

Banner /etc/issue