Add audit and apply methods for 7.7.4: Ensure default deny firewall policy. (Include ipv4 and ip6)

bin/hardening/7.7.4_ensure_default_deny_firewall_policy.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+#
+# harbian audit 9 Hardening
+#
+
+#
+# 7.7.4 Ensure default deny firewall policy (Scored)
+# Include ipv4 and ipv6
+# Add this feature:Authors : Samson wen, Samson <sccxboy@gmail.com>
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+HARDENING_LEVEL=2
+
+IPS4=$(which iptables)
+IPS6=$(which ip6tables)
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    if [ $(${IPS4} -S | egrep "\-P") -eq 0 ]; then
+		crit "Ip4tables: Firewall policy is not default deny!"
+		if [ $(${IPS6} -S | egrep "\-P") -eq 0 ]; then
+			crit "Ip6tables: Firewall policy is not default deny!"
+			FNRET=1
+		else
+			ok "Ip6tables has set default deny for firewall policy!"
+			FNRET=0
+		fi
+	else
+		ok "Ip4tables has set default deny for firewall policy!"
+		FNRET=0
+	fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    if [ $FNRET = 0 ]; then
+        ok "Iptables/Ip6tables has set default deny for firewall policy!"
+    else
+        warn "Iptables/Ip6tables is not set default deny for firewall policy! need the administrator to manually add it. Howto set: iptables/ip6tables -P INPUT DROP; iptables/ip6tables -P OUTPUT DROP; iptables/ip6tables -P FORWARD DROP."
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    . /etc/default/cis-hardening
+fi
+if [ -z "$CIS_ROOT_DIR" ]; then
+     echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+     echo "Cannot source CIS_ROOT_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
+    . $CIS_ROOT_DIR/lib/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
+    exit 128
+fi