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_default_deny_policy.sh
+++ b/bin/hardening/ip6tables_default_deny_policy.sh
@@ -0,0 +1,97 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure ip6tables default deny firewall policy (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 default deny firewall policy"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    INPUT_CHAIN_DROP=1
+    OUTPUT_CHAIN_DROP=1
+    FORWARD_CHAIN_DROP=1
+
+    local input_default=""
+    local output_default=""
+    local forward_default=""
+    input_default=$($SUDO_CMD ip6tables -S INPUT | awk '/^-P/ {print $3}')
+    output_default=$($SUDO_CMD ip6tables -S OUTPUT | awk '/^-P/ {print $3}')
+    forward_default=$($SUDO_CMD ip6tables -S FORWARD | awk '/^-P/ {print $3}')
+
+    if [ "$input_default" != "DROP" ]; then
+        crit "ip6tables 'INPUT' chain does not have 'DROP' has default policy"
+    else
+        ok "ip6tables 'input' chain has 'DROP' has default policy"
+        INPUT_CHAIN_DROP=0
+    fi
+
+    if [ "$output_default" != "DROP" ]; then
+        crit "ip6tables 'OUTPUT' chain does not have 'DROP' has default policy"
+    else
+        ok "ip6tables 'OUTPUT' chain has 'DROP' has default policy"
+        OUTPUT_CHAIN_DROP=0
+    fi
+
+    if [ "$forward_default" != "DROP" ]; then
+        crit "ip6tables 'FORWARD' chain does not have 'DROP' has default policy"
+    else
+        ok "ip6tables 'FORWARD' chain has 'DROP' has default policy"
+        FORWARD_CHAIN_DROP=0
+    fi
+
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    audit
+    if [ "$INPUT_CHAIN_DROP" -ne 0 ]; then
+        info "Please review your ip6tables default 'INPUT' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
+    fi
+
+    if [ "$OUTPUT_CHAIN_DROP" -ne 0 ]; then
+        info "Please review your ip6tables default 'OUTPUT' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
+    fi
+
+    if [ "$FORWARD_CHAIN_DROP" -ne 0 ]; then
+        info "Please review your ip6tables default 'FORWARD' policy. We wont apply it for you to avoid cutting the branch you are sitting on"
+    fi
+
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+
+if [ -z "$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