SV-219316r958452: The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication. | Canonical Ubuntu 18.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication.

Description

Discussion Text

Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the individual user or group will not be available for forensic analysis.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000187SV-109959V-100855

References

DPMS Target Canonical Ubuntu 18.04 LTS DISA DPMS Target Canonical Ubuntu 18.04 LTS 4055

Checks

DISA STIG (Manual Reference)

Verify the Ubuntu operating system has the "libpam-pkcs11" package installed, by running the following command:

     # dpkg -l | grep libpam-pkcs11

If "libpam-pkcs11" is not installed, this is a finding.

Check if use_mappers is set to pwent in /etc/pam_pkcs11/pam_pkcs11.conf file
     # grep use_mappers /etc/pam_pkcs11/pam_pkcs11.conf
     use_mappers = pwent

If "use_mappers" is not found, or is not set to "pwent", 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.ubuntu1804:def:253
# The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# package libpam-pkcs11 is installed
# dpkginfo_object (dpkginfo_test)
test_1() {
  grep -A1 '^Package: libpam-pkcs11$' /var/lib/dpkg/status &>/dev/null
}
# Check pam_pkcs11.conf has use_mappers set to pwent
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  (sed -En 's/^\s*use_mappers[ \t]+=[ \t]+['\''"]?(\w+)['\''"]?\s*;\s*$/\1/p' '/etc/pam_pkcs11/pam_pkcs11.conf') | grep -qxF 'pwent'
}

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.ubuntu1804:def:253


if dpkg -s libpam-pkcs11 &> /dev/null; then
    if grep -q "^use_mappers=pwent" /etc/pam_pkcs11/pam_pkcs11.conf; then
        echo "PASS"
        exit 0
    else
        echo "FAIL"
        exit 1
    fi
else
    echo "FAIL"
    exit 1
fi

Remediation

Install libpam-pkcs11 package on the system. 

Set use_mappers=pwent in /etc/pam_pkcs11/pam_pkcs11.conf

If the system is missing an "/etc/pam_pkcs11/" directory and an "/etc/pam_pkcs11/pam_pkcs11.conf", find an example to copy into place and modify accordingly at "/usr/share/doc/libpam-pkcs11/examples/pam_pkcs11.conf.example.gz".