SV-258009r1045077: RHEL 9 SSH daemon must display the date and time of the last successful account logon upon an SSH logon. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 SSH daemon must display the date and time of the last successful account logon upon an SSH logon.

Description

Discussion Text

Providing users feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

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

Checks

DISA STIG (Manual Reference)

Verify the SSH daemon provides users with feedback on when account accesses last occurred with the following command:

$ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*printlastlog'

PrintLastLog yes

If the "PrintLastLog" keyword is set to "no", the returned line is commented out, or no output is returned, 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:258009
# RHEL 9 SSH daemon must display the date and time of the last successful account logon upon an SSH logon.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# sshd_config includes sshd_config.d
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^\s*include\s+(.*)\s*$/\1/p' '/etc/ssh/sshd_config') | grep -qxF '/etc/ssh/sshd_config.d/*.conf'
}
# /etc/ssh/sshd_config.d: PrintLastLog is set to yes
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  (grep -rhP --include='*.conf' '^\s*(?i)PrintLastLog(?-i)[ \t]+([\w\"]+)[\s]*(?:|(?:#.*))?$' '/etc/ssh/sshd_config.d' | sed -En 's/^\s*(?i)PrintLastLog(?-i)[ \t]+([\w\"]+)[\s]*(?:|(?:#.*))?$/\1/p') | grep -Pq '^(yes|"yes")$'
}
# /etc/ssh/sshd_config: PrintLastLog is set to yes
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  (sed -En 's/^\s*(?i)PrintLastLog(?-i)[ \t]+([\w\"]+)[\s]*(?:|(?:#.*))?$/\1/p' '/etc/ssh/sshd_config') | grep -Pq '^(yes|"yes")$'
}

if ( ( test_1 && test_2 ) || test_3 ); 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:258009

if grep -qE "^\\s*(?i)PrintLastLog(?-i)[ \\t]+yes[\\s]*(?:|(?:#.*))?$" /etc/ssh/sshd_config || \
   grep -qE "^\\s*(?i)PrintLastLog(?-i)[ \\t]+yes[\\s]*(?:|(?:#.*))?$" /etc/ssh/sshd_config.d/*.conf; then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure the SSH daemon to provide users with feedback on when account accesses last occurred.

Add the following line to "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d", or uncomment the line and set the value to "yes":

PrintLastLog yes

The SSH service must be restarted for changes to take effect:

$ sudo systemctl restart sshd.service