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#14093 - script for checking iptable rules #14116

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Merged
vojtapolasek merged 2 commits into from
Nov 19, 2025
Merged

#14093 - script for checking iptable rules #14116

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c3c6767
#14093 - script for checking iptable rules (xccdf_org.ssgproject.cont…
Nov 11, 2025
a1ac6cf
fixed EOF
Nov 13, 2025
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24 changes: 18 additions & 6 deletions ...de/system/network/network-iptables/iptables_activation/set_loopback_traffic/sce/shared.sh
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Original file line number Diff line number Diff line change
@@ -1,17 +1,29 @@
#!/bin/bash
#!/usr/bin/env bash
# platform = multi_platform_sle,multi_platform_ubuntu
# check-import = stdout

regex="\s+[0-9]+\s+[0-9]+\s+ACCEPT\s+all\s+--\s+lo\s+\*\s+0\.0\.0\.0\/0\s+0\.0\.0\.0\/0[[:space:]]+[0-9]+\s+[0-9]+\s+DROP\s+all\s+--\s+\*\s+\*\s+127\.0\.0\.0\/8\s+0\.0\.0\.0\/0"
# Check that iptables exist in current path
if ! command -v iptables >/dev/null; then
exit "$XCCDF_RESULT_FAIL"
fi

# Check chain INPUT for loopback related rules
if ! iptables -L INPUT -v -n -x | grep -Ezq "$regex" ; then
# Get current rules
rules=$(iptables -S)

# Check for "-A INPUT -i lo -j ACCEPT"
if [[ ! "$rules" =~ "-A INPUT -i lo -j ACCEPT" ]]; then
exit "$XCCDF_RESULT_FAIL"
fi

# Check chain OUTPUT for loopback related rules
if ! iptables -L OUTPUT -v -n -x | grep -Eq "\s[0-9]+\s+[0-9]+\s+ACCEPT\s+all\s+--\s+\*\s+lo\s+0\.0\.0\.0\/0\s+0\.0\.0\.0\/0" ; then
# Check for "-A OUTPUT -o lo -j ACCEPT"
if [[ ! "$rules" =~ "-A OUTPUT -o lo -j ACCEPT" ]]; then
exit "$XCCDF_RESULT_FAIL"
fi

# Check for "-A INPUT -s 127.0.0.0/8 -j DROP"
if [[ ! "$rules" =~ "-A INPUT -s 127.0.0.0/8 -j DROP" ]]; then
exit "$XCCDF_RESULT_FAIL"
fi

exit "$XCCDF_RESULT_PASS"

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