SV-226420r603265: The NFS server must have logging implemented. | Solaris 10 SPARC STIG SCAP Benchmark

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Assessment Title

Rule Text

The NFS server must have logging implemented.

Description

Discussion Text

Filesystem logging, especially for NFS exported file systems, can be critical to detecting data misuse and possible hardware/system errors that may, otherwise, go unnoticed.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000172SV-40041V-4300

References

DPMS Target Solaris 10 SPARC DISA DPMS Target Solaris 10 SPARC 4060

Checks

DISA STIG (Manual Reference)

To enable NFS server logging the log option must be applied to all exported file systems in the /etc/dfs/dfstab. Perform the following to verify NFS is enabled.

      #       share

The preceding command will display all exported filesystems. Each line should contain a log entry to indicate logging is enabled. If the log entry is not present, this is a finding. If the share command does not return anything, then this is not an NFS server and this is considered not applicable.

NFS version 4 does not support server logging.  Verify NFS_SERVER_VERSMAX in /etc/default/nfs.

# grep NFS_SERVER_VERSMAX /etc/default/nfs

If NFS_SERVER_VERSMAX is commented out or set to any value but 2 or 3, 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.fso.solaris11:def:18
# The NFS server must have logging implemented.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# No shares
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ! ( grep -Pq '^[ 	]*share(.*)$' '/etc/dfs/dfstab' &>/dev/null )
}
# The NFS server must has logging implemented.
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  (sed -En 's/^[ 	]*share(.*)$/\1/p' '/etc/dfs/dfstab') | grep -Pq '\s-o\s*(\S*,)?log(,|\s|=)'
}
# NFS_SERVER_VERSMAX is 2 or 3
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  (sed -En 's/^[ 	]*NFS_SERVER_VERSMAX=([0-9]+)/\1/p' '/etc/default/nfs') | grep -Pq '^(2|3)$'
}

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.fso.solaris11:def:18
if ! grep -q '^[ \t]*share' /etc/dfs/dfstab; then
    echo "FAIL"
    exit 1
fi
if ! grep -q '\\s-o\\s*(\\S*,)?log(,|\\s|=)' /etc/dfs/dfstab; then
    echo "FAIL"
    exit 1
fi
if ! grep -q '^[ \t]*NFS_SERVER_VERSMAX=(2|3)$' /etc/default/nfs; then
    echo "FAIL"
    exit 1
fi
echo "PASS"
exit 0

Remediation

Edit /etc/dfs/dfstab and add the log option to all exported filesystems. Run the shareall command for the changes to take effect.

NFS version 2 or 3 must be forced by updating the NFS_SERVER_VERSMAX variable appropriately in /etc/default/nfs and restarting the NFS daemon.