feat: add debian12 scripts

- iptables_loopback.sh -> 4.3.2.2 - iptables_rule_them_all.sh -> 4.3.2.4 - iptables_outbound_established.sh -> 4.3.2.3 - ip6tables_loopback.sh -> 4.3.3.2 - ip6tables_outbound_established.sh -> 4.3.3.3 - ip6tables_rule_them_all.sh -> 4.3.3.4 - ip6tables_default_deny_policy.sh -> 4.3.3.1
2025-09-03 13:18:21 +02:00 · 2025-08-05 16:23:52 +02:00
parent 1926758707
commit 4be1a9d9e4
14 changed files with 819 additions and 0 deletions
--- a/bin/hardening/ip6tables_outbound_established.sh
+++ b/bin/hardening/ip6tables_outbound_established.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure ip6tables outbound and established connections are configured (Manual)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=2
+# shellcheck disable=2034
+DESCRIPTION="Ensure ip6tables outbound and established connections are configured"
+PACKAGE="iptables"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    is_pkg_installed "$PACKAGE"
+    if [ "$FNRET" -ne 0 ]; then
+        crit "$PACKAGE is not installed"
+        return
+    fi
+
+    is_ipv6_enabled
+    if [ "$NFRET" -ne 0 ]; then
+        ok "ipv6 is not enabled"
+        return
+    fi
+
+    INPUT_ESTABLISHED=1
+    OUTPUT_ESTABLISHED=1
+
+    local output_established_rules
+
+    if $SUDO_CMD ip6tables -S INPUT | grep ESTABLISHED >/dev/null 2>&1; then
+        INPUT_ESTABLISHED=0
+        ok "INPUT ESTABLISHED connections are allowed"
+    else
+        crit "INPUT ESTABLISHED connections are not allowed"
+    fi
+
+    if $SUDO_CMD ip6tables -S OUTPUT | grep state >/dev/null 2>&1; then
+        output_established_rules=$($SUDO_CMD ip6tables -S OUTPUT | grep state)
+        # shellcheck disable=2086
+        if grep ESTABLISHED <<<$output_established_rules >/dev/null && grep NEW <<<$output_established_rules >/dev/null; then
+            OUTPUT_ESTABLISHED=0
+            ok "OUTPUT NEW and ESTABLISHED connections are allowed"
+        else
+            crit "OUTPUT NEW and ESTABLISHED connections are not allowed"
+        fi
+    else
+        crit "OUTPUT NEW and ESTABLISHED connections are not allowed"
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    if [ "$INPUT_ESTABLISHED" -ne 0 ] || [ "$OUTPUT_ESTABLISHED" -ne 0 ]; then
+        info "Please review manually your outbound and established connection, and update them accordingly to your site policies"
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+
+if [ -z "$CIS_LIB_DIR" ]; then
+    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+    echo "Cannot source CIS_LIB_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
+    # shellcheck source=../../lib/main.sh
+    . "${CIS_LIB_DIR}"/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
+    exit 128
+fi