SV-280987r1195371: RHEL 10 must authenticate the remote logging server for off-loading audit logs via "rsyslog". | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must authenticate the remote logging server for off-loading audit logs via "rsyslog".

Description

Discussion Text

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. RHEL 10 installation media provides "rsyslogd", a system utility providing support for message logging. Support for both internet and Unix domain sockets enables this utility to support both local and remote logging. Coupling this utility with "gnutls" (a secure communications library implementing the Secure Sockets Layer (SSL), Transport Layer Security (TLS), and Datagram TLS (DTLS) protocols) creates a method to securely encrypt and off-load auditing. The "rsyslog" supported authentication modes include: - anon - Anonymous authentication. - x509/fingerprint - Certificate fingerprint authentication. - x509/certvalid - Certificate validation only. - x509/name - Certificate validation and subject name authentication. Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224

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

IA Controls

NIST SP 800-53

Not mappedCCI-001851

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:280987
# RHEL 10 must authenticate the remote logging server for off-loading audit logs via "rsyslog".
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# ActionSendStreamDriverAuthMode is set to x509/name (legacy syntax)
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( (sed -En 's/^\$ActionSendStreamDriverAuthMode\s+(\S+)\s*$/\1/p' '/etc/rsyslog.conf') | grep -qxF 'x509/name' ) || ( (grep -rhP --include='*.conf' '^\$ActionSendStreamDriverAuthMode\s+(\S+)\s*$' '/etc/rsyslog.d' | sed -En 's/^\$ActionSendStreamDriverAuthMode\s+(\S+)\s*$/\1/p') | grep -qxF 'x509/name' )
}
# StreamDriverAuthMode is set to x509/name (advanced syntax)
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ( ( (sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p' '/etc/rsyslog.conf') | grep -Pq '(?i)(?:^|\n)[^#]*\btype\s*=\s*"omfwd"' ) && ( (sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p' '/etc/rsyslog.conf') | grep -Pq '(?i)(?:^|\n)[^#]*\bStreamDriver\.?AuthMode\s*=\s*"x509/name"' ) ) || ( ( (grep -rhP --include='*.conf' '^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)' '/etc/rsyslog.d' | sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p') | grep -Pq '(?i)(?:^|\n)[^#]*\btype\s*=\s*"omfwd"' ) && ( (grep -rhP --include='*.conf' '^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)' '/etc/rsyslog.d' | sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p') | grep -Pq '(?i)(?:^|\n)[^#]*\bStreamDriver\.?AuthMode\s*=\s*"x509/name"' ) )
}
# TlsAuthMode is set to x509/name (advanced syntax)
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  ( ( (sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p' '/etc/rsyslog.conf') | grep -Pq '(?i)(?:^|\n)[^#]*\btype\s*=\s*"omfwd"' ) && ( (sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p' '/etc/rsyslog.conf') | grep -Pq '(?i)(?:^|\n)[^#]*\btls\.?AuthMode\s*=\s*"x509/name"' ) ) || ( ( (grep -rhP --include='*.conf' '^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)' '/etc/rsyslog.d' | sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p') | grep -Pq '(?i)(?:^|\n)[^#]*\btype\s*=\s*"omfwd"' ) && ( (grep -rhP --include='*.conf' '^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)' '/etc/rsyslog.d' | sed -En 's/^\*\.\*\s+action\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p') | grep -Pq '(?i)(?:^|\n)[^#]*\btls\.?AuthMode\s*=\s*"x509/name"' ) )
}
# StreamDriverAuthMode is not set in a module block (advanced syntax)
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  ( (sed -En 's/^\s*module\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p' '/etc/rsyslog.conf') | grep -Pq '(?i)(?:^|\n)[^#]*\bStreamDriver\.?AuthMode\b' ) || ( (grep -rhP --include='*.conf' '^\s*module\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)' '/etc/rsyslog.d' | sed -En 's/^\s*module\((\s*(?:[^#\)]*(?:#.*$)?\n)*[^#\)]*)\)/\1/p') | grep -Pq '(?i)(?:^|\n)[^#]*\bStreamDriver\.?AuthMode\b' )
}
# StreamdriverPermittedpeer is present
# textfilecontent54_object (textfilecontent54_test)
test_5() {
  ( grep -Pq '^(?i)\s*streamdriver\.permittedpeer\s*=\s*\S+\s*$' '/etc/rsyslog.conf' &>/dev/null ) || ( grep -rqP --include='*.conf' '^(?i)\s*streamdriver\.permittedpeer\s*=\s*\S+\s*$' '/etc/rsyslog.d' &>/dev/null )
}
# TlsPermittedpeer is present
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  ( grep -Pq '^(?i)\s*tls\.permittedpeer\s*=\s*\S+\s*$' '/etc/rsyslog.conf' &>/dev/null ) || ( grep -rqP --include='*.conf' '^(?i)\s*tls\.permittedpeer\s*=\s*\S+\s*$' '/etc/rsyslog.d' &>/dev/null )
}

if ( ( test_1 || test_2 || test_3 ) && test_4 && ( test_5 || test_6 ) ); 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:280987
if [ ! -f "/etc/rsyslog.conf" ] && [ ! -f "/etc/rsyslog.d/99-forwarding.conf" ]; then echo "PASS"; exit 0; fi
if [ -f "/etc/rsyslog.conf" ]; then
    grep -qE "^\\$ActionSendStreamDriverAuthMode\\s+(x509/name)\\s*$" /etc/rsyslog.conf || grep -qE "(?i)(?:^|\\n)[^#]*\\bStreamDriver\\.?AuthMode\\s*=\\s*\"x509/name\"" /etc/rsyslog.conf
else
    grep -qE "^\\$ActionSendStreamDriverAuthMode\\s+(x509/name)\\s*$" /etc/rsyslog.d/99-forwarding.conf || grep -qE "(?i)(?:^|\\n)[^#]*\\bStreamDriver\\.?AuthMode\\s*=\\s*\"x509/name\"" /etc/rsyslog.d/99-forwarding.conf
fi
if [ $? -eq 0 ]; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure RHEL 10 to authenticate the remote logging server for off-loading audit logs by setting the following options in "/etc/rsyslog.d/99-forwarding.conf":

streamdriver.authmode="x509/name"

Specify the logserver to prevent man-in-the-middle attacks in the following format:
streamdriver.permittedpeer="rsyslog.server.example.com"