SV-38340r2: The /etc/shadow file (or equivalent) must be group-owned by root, bin, sys or other. | HP-UX 11.23 Security Technical Implementation Guide

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Assessment Title

Rule Text

The /etc/shadow file (or equivalent) must be group-owned by root, bin, sys or other.

Description

Discussion Text

The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which must not be accessible to users other than root.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-1

References

DPMS Target HP-UX 11.23 DISA DPMS Target HP-UX 11.23 2170

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.fso.hpux11:def:83
# The /etc/shadow file (or equivalent) must be group-owned by root, bin, sys or other.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - file_object (file_test) -- Test group of /tcb/files/auth/*/* is root: no extractor for field "group_id"
#   - file_object (file_test) -- Test group of /tcb/files/auth/*/* is bin: no extractor for field "group_id"
#   - file_object (file_test) -- Test group of /tcb/files/auth/*/* is sys: no extractor for field "group_id"

# Test group of /etc/shadow is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/etc/shadow')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/shadow is bin
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/etc/shadow')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/shadow is sys
# file_object (file_test)
test_5() {
  [ "$(stat -c '%g' '/etc/shadow')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# test group /tcb is root
# file_object (file_test)
test_6() {
  [ "$(stat -c '%g' '/tcb')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_7() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /tcb is bin
# file_object (file_test)
test_8() {
  [ "$(stat -c '%g' '/tcb')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_9() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /tcb is sys
# file_object (file_test)
test_10() {
  [ "$(stat -c '%g' '/tcb')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test group of /tcb/files/auth/* is root
# file_object (file_test)
test_11() {
  ( [ "$(stat -c '%g' '/tcb/files')" -eq 0 ] ) || ( [ "$(stat -c '%g' '/tcb/files/auth')" -eq 0 ] )
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_12() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /tcb/files/auth/* is bin
# file_object (file_test)
test_13() {
  ( [ "$(stat -c '%g' '/tcb/files')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ] ) || ( [ "$(stat -c '%g' '/tcb/files/auth')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ] )
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_14() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /tcb/files/auth/* is sys
# file_object (file_test)
test_15() {
  ( [ "$(stat -c '%g' '/tcb/files')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ] ) || ( [ "$(stat -c '%g' '/tcb/files/auth')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ] )
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_17() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_19() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}

if ( ( test_1 || ( test_2 && test_3 ) || ( test_4 && test_5 ) ) && ! ( test_6 || ( test_7 && test_8 ) || ( test_9 && test_10 ) ) && ! ( test_11 || ( test_12 && test_13 ) || ( test_14 && test_15 ) ) && ! ( test_17 || test_19 ) ); then
  echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
  echo "FAIL (or see MANUAL REVIEW note above)"
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.fso.hpux11:def:83

if [ ! -f "/etc/shadow" ]; then echo "PASS"; exit 0; fi
if [ $(stat -c "%G" /etc/shadow) = "root" ]; then echo "PASS"; exit 0; fi
if [ $(grep -E "^bin:[^:]*:[0-9]+:" /etc/group | wc -l) -gt 0 ]; then
  if [ $(stat -c "%G" /etc/shadow) = "bin" ]; then echo "PASS"; exit 0; fi
fi
if [ $(grep -E "^sys:[^:]*:[0-9]+:" /etc/group | wc -l) -gt 0 ]; then
  if [ $(stat -c "%G" /etc/shadow) = "sys" ]; then echo "PASS"; exit 0; fi
fi
echo "FAIL"; exit 1

Remediation

For Trusted Mode:
# chgrp root /tcb
#chgrp root /tcb/files /tcb/files/auth
# chgrp root  /tcb/files/auth/[a-z]/* 

For SMSE:
# chgrp root /etc/shadow