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<?php
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/*
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* easyrule.inc
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2009-2013 BSD Perimeter
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* Copyright (c) 2013-2016 Electric Sheep Fencing
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* Copyright (c) 2014-2022 Rubicon Communications, LLC (Netgate)
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* Originally Sponsored By Anathematic @ pfSense Forums
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* All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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$blockaliasname = 'EasyRuleBlockHosts';
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$protocols_with_ports = array('tcp', 'udp');
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require_once("functions.inc");
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require_once("util.inc");
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require_once("ipsec.inc");
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require_once("config.inc");
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global $specialsrcdst;
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$specialsrcdst = explode(" ", "any (self) pppoe l2tp openvpn");
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function easyrule_find_rule_interface($int) {
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global $config;
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/* Borrowed from firewall_rules.php */
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$iflist = get_configured_interface_with_descr(true);
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/* Add interface groups */
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foreach (config_get_path('ifgroups/ifgroupentry', []) as $ifgen) {
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$iflist[$ifgen['ifname']] = $ifgen['ifname'];
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}
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if (is_pppoe_server_enabled()) {
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$iflist['pppoe'] = gettext("PPPoE Server");
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}
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if (config_get_path('l2tp/mode') == "server") {
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$iflist['l2tp'] = gettext("L2TP VPN");
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}
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/* Add IPsec tunnel interface */
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if (ipsec_enabled()) {
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$iflist["enc0"] = gettext("IPsec");
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}
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if (count(config_get_path('openvpn/openvpn-server', [])) ||
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count(config_get_path('openvpn/openvpn-client', []))) {
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$iflist["openvpn"] = gettext("OpenVPN");
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}
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/* Check if the given name matches a known assigned interface id or
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* common group name */
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if (array_key_exists($int, $iflist)) {
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return $int;
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}
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/* Check if the user passed an interface description name instead of the
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* internal name. */
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foreach ($iflist as $if => $ifd) {
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if (strtolower($int) == strtolower($ifd)) {
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return $if;
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}
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}
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/* Check for unassigned OpenVPN or IPsec and return the associated
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* group name. */
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if (substr($int, 0, 4) == "ovpn") {
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return "openvpn";
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}
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if (substr($int, 0, 5) == "ipsec") {
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return "ipsec";
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}
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/* If the user passed a real interface name, attempt to map it to an
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* assigned interface */
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$iff = convert_real_interface_to_friendly_interface_name($int);
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if (($iff !== NULL) && ($iff != $int)) {
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return $iff;
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}
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return false;
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}
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function easyrule_block_rule_exists($int = 'wan', $ipproto = "inet") {
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global $blockaliasname, $config;
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/* No rules, we we know it doesn't exist */
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if (empty(config_get_path('filter/rule', []))) {
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return false;
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}
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/* Search through the rules for one referencing our alias */
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foreach (config_get_path('filter/rule', []) as $rule) {
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if (!is_array($rule) || !is_array($rule['source'])) {
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continue;
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}
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$checkproto = isset($rule['ipprotocol']) ? $rule['ipprotocol'] : "inet";
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if ((array_get_path($rule, 'source/address') == $blockaliasname . strtoupper($int)) &&
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($rule['interface'] == $int) &&
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($checkproto == $ipproto)) {
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return true;
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}
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}
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return false;
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}
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function easyrule_block_rule_create($int = 'wan', $ipproto = "inet") {
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global $blockaliasname, $config;
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/* If the alias doesn't exist, exit.
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* Can't create an empty alias, and we don't know a host */
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if (easyrule_block_alias_getid($int) === false) {
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return "noalias";
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}
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/* If the rule already exists, no need to do it again */
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if (easyrule_block_rule_exists($int, $ipproto)) {
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return true;
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}
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filter_rules_sort();
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$a_filter = config_get_path('filter/rule', []);
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/* Make up a new rule */
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$filterent = array();
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$filterent['type'] = 'block';
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$filterent['interface'] = $int;
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$filterent['ipprotocol'] = $ipproto;
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$filterent['source'] = [];
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$filterent['source']['address'] = $blockaliasname . strtoupper($int);
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$filterent['destination'] = [];
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$filterent['destination']['any'] = '';
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$filterent['descr'] = gettext("Blocked via EasyRule");
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$filterent['created'] = make_config_revision_entry(null, "EasyRule");
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$filterent['tracker'] = (int)microtime(true);
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// Refer to firewall_rules_edit.php separators updating code.
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// Using same code, variables, and techniques here.
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$after = -1; // Place rule at top and move all separators.
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array_splice($a_filter, $after+1, 0, array($filterent));
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config_set_path('filter/rule', $a_filter);
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$tmpif = $int;
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// Update the separators
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$a_separators = config_get_path('filter/separator/' . strtolower($tmpif), []);
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$ridx = ifridx($tmpif, $after); // get rule index within interface
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$mvnrows = +1;
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move_separators($a_separators, $ridx, $mvnrows);
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config_set_path('filter/separator/' . strtolower($tmpif), $a_separators);
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return true;
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}
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function easyrule_block_alias_getid($int = 'wan') {
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global $blockaliasname;
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/* Hunt down an alias with the name we want, return its id */
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foreach (config_get_path('aliases/alias', []) as $aliasid => $alias) {
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if ($alias['name'] == $blockaliasname . strtoupper($int)) {
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return $aliasid;
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}
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}
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return false;
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}
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function easyrule_block_alias_add($host, $int = 'wan') {
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global $blockaliasname, $config;
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/* If the host isn't a valid IP address, bail */
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$host = trim($host, "[]");
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if (!is_ipaddr($host) && !is_subnet($host)) {
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return "invalid";
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}
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$a_aliases = config_get_path('aliases/alias', []);
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/* Try to get the ID if the alias already exists */
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$id = easyrule_block_alias_getid($int);
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if ($id === false) {
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unset($id);
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}
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$alias = array();
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if (is_subnet($host)) {
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list($host, $mask) = explode("/", $host);
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} elseif (is_specialnet($host)) {
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$mask = 0;
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} elseif (is_ipaddrv6($host)) {
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$mask = 128;
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} else {
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$mask = 32;
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}
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if (isset($id) &&
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array_key_exists($id, $a_aliases) &&
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is_array($a_aliases[$id])) {
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// Catch case when the list is empty
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if (empty(array_get_path($a_aliases, "{$id}/address", ""))) {
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$a_address = array();
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$a_detail = array();
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} else {
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$a_address = explode(" ", array_get_path($a_aliases, "{$id}/address", ""));
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/* Make sure this IP address isn't already in the list. */
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if (in_array($host.'/'.$mask, $a_address)) {
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return "exists";
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}
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$a_detail = explode("||", array_get_path($a_aliases, "{$id}/detail"));
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}
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/* Since the alias already exists, just add to it. */
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$alias['name'] = array_get_path($a_aliases, "{$id}/name");
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$alias['type'] = array_get_path($a_aliases, "{$id}/type");
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$alias['descr'] = array_get_path($a_aliases, "{$id}/descr");
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$a_address[] = $host.'/'.$mask;
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$a_detail[] = gettext('Entry added') . ' ' . date('r');
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$alias['address'] = join(" ", $a_address);
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$alias['detail'] = join("||", $a_detail);
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} else {
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/* Create a new alias with all the proper information */
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$alias['name'] = $blockaliasname . strtoupper($int);
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$alias['type'] = 'network';
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$alias['descr'] = gettext("Blocked via EasyRule");
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$alias['address'] = $host . '/' . $mask;
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$alias['detail'] = gettext('Entry added') . ' ' . date('r') . '||';
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}
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244
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/* Replace the old alias if needed, otherwise tack it on the end */
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if (isset($id) && $a_aliases[$id]) {
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$a_aliases[$id] = $alias;
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248
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} else {
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249
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$a_aliases[] = $alias;
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250
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}
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251
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252
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// Sort list
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253
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$a_aliases = msort($a_aliases, "name");
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254
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config_set_path('aliases/alias', $a_aliases);
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return true;
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}
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258
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259
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function easyrule_block_host_add($host, $int = 'wan') {
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260
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global $retval;
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261
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/* Bail if the supplied host is not a valid IP address */
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262
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$host = trim($host, "[]");
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263
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if (!is_ipaddr($host) && !is_subnet($host)) {
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264
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return "invalid";
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265
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}
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266
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267
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if (is_v6($host)) {
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$ipproto = 'inet6';
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269
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} else {
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270
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$ipproto = 'inet';
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271
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}
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272
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273
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/* Flag whether or not we need to reload the filter */
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274
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$dirty = false;
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275
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276
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/* Attempt to add this host to the alias */
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277
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$alias_add_result = easyrule_block_alias_add($host, $int);
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278
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if ($alias_add_result === true) {
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279
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$dirty = true;
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280
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} else {
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281
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/* Couldn't add the alias, or adding the host failed. */
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282
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return $alias_add_result;
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283
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}
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284
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|
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285
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/* Attempt to add the firewall rule if it doesn't exist.
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286
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* Failing to add the rule isn't necessarily an error, it may
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287
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* have been modified by the user in some way. Adding to the
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288
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* Alias is what's important.
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289
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*/
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290
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if (!easyrule_block_rule_exists($int, $ipproto)) {
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291
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$rule_create_result = easyrule_block_rule_create($int, $ipproto);
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292
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if ($rule_create_result === true) {
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293
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$dirty = true;
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294
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} else {
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295
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return $rule_create_result;
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296
|
}
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|
297
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}
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|
298
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|
|
299
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/* If needed, write the config and reload the filter */
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300
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if ($dirty) {
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301
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write_config(sprintf(gettext("Blocked %s via EasyRule"), $host));
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302
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$retval = filter_configure();
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303
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if (!empty($_SERVER['DOCUMENT_ROOT'])) {
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304
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header("Location: firewall_aliases.php");
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305
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exit;
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306
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} else {
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307
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return true;
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308
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}
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309
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} else {
|
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310
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return false;
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|
311
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}
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|
312
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}
|
|
313
|
|
|
314
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function easyrule_pass_rule_add($int, $proto, $srchost, $dsthost, $dstport, $ipproto) {
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|
315
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global $config;
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316
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|
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317
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init_config_arr(array('filter', 'rule'));
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318
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filter_rules_sort();
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319
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$a_filter = config_get_path('filter/rule', []);
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320
|
|
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321
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/* Make up a new rule */
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322
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$filterent = array();
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323
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$filterent['type'] = 'pass';
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324
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$filterent['interface'] = $int;
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325
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$filterent['ipprotocol'] = $ipproto;
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326
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$filterent['descr'] = gettext("Passed via EasyRule");
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327
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328
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if ($proto != "any") {
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329
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$filterent['protocol'] = $proto;
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330
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} else {
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331
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unset($filterent['protocol']);
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332
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}
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|
333
|
|
|
334
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/* Default to only allow echo requests, since that's what most people want and
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335
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* it should be a safe choice. */
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336
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if ($proto == "icmp") {
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337
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$filterent['icmptype'] = 'echoreq';
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338
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}
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339
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340
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if ((strtolower($proto) == "icmp6") || (strtolower($proto) == "icmpv6")) {
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341
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$filterent['protocol'] = "icmp";
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342
|
}
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|
343
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|
344
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if (is_subnet($srchost)) {
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345
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list($srchost, $srcmask) = explode("/", $srchost);
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346
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} elseif (is_specialnet($srchost)) {
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347
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$srcmask = 0;
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348
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} elseif (is_ipaddrv6($srchost)) {
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349
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$srcmask = 128;
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350
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} else {
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351
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$srcmask = 32;
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352
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}
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|
353
|
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|
354
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if (is_subnet($dsthost)) {
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355
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list($dsthost, $dstmask) = explode("/", $dsthost);
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356
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} elseif (is_specialnet($dsthost)) {
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357
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$dstmask = 0;
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358
|
} elseif (is_ipaddrv6($dsthost)) {
|
|
359
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$dstmask = 128;
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|
360
|
} else {
|
|
361
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$dstmask = 32;
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362
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}
|
|
363
|
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364
|
pconfig_to_address($filterent['source'], $srchost, $srcmask);
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365
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pconfig_to_address($filterent['destination'], $dsthost, $dstmask, '', $dstport, $dstport);
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|
366
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|
|
367
|
$filterent['created'] = make_config_revision_entry(null, "EasyRule");
|
|
368
|
$filterent['tracker'] = (int)microtime(true);
|
|
369
|
$a_filter[] = $filterent;
|
|
370
|
config_set_path('filter/rule', $a_filter);
|
|
371
|
|
|
372
|
write_config($filterent['descr']);
|
|
373
|
$retval = filter_configure();
|
|
374
|
if (!empty($_SERVER['DOCUMENT_ROOT'])) {
|
|
375
|
header("Location: firewall_rules.php?if={$int}");
|
|
376
|
exit;
|
|
377
|
} else {
|
|
378
|
return true;
|
|
379
|
}
|
|
380
|
}
|
|
381
|
|
|
382
|
function easyrule_parse_block($int, $src) {
|
|
383
|
if (!empty($src) && !empty($int)) {
|
|
384
|
$src = trim($src, "[]");
|
|
385
|
if (!is_ipaddr($src) && !is_subnet($src)) {
|
|
386
|
return gettext("Tried to block invalid address:") . ' ' . htmlspecialchars($src);
|
|
387
|
}
|
|
388
|
$int = easyrule_find_rule_interface($int);
|
|
389
|
if ($int === false) {
|
|
390
|
return gettext("Invalid interface for block rule.");
|
|
391
|
}
|
|
392
|
switch ((string)easyrule_block_host_add($src, $int)) {
|
|
393
|
case "exists":
|
|
394
|
return gettext("Block entry already exists.");
|
|
395
|
break;
|
|
396
|
case "invalid":
|
|
397
|
return gettext("Invalid address.");
|
|
398
|
break;
|
|
399
|
case "1":
|
|
400
|
return gettext("Block added successfully");
|
|
401
|
break;
|
|
402
|
case "":
|
|
403
|
default:
|
|
404
|
return gettext("Failed to create block rule, alias, or add entry.");
|
|
405
|
break;
|
|
406
|
}
|
|
407
|
} else {
|
|
408
|
return gettext("Tried to block but had no address or interface");
|
|
409
|
}
|
|
410
|
return gettext("Unknown block error.");
|
|
411
|
}
|
|
412
|
|
|
413
|
function easyrule_parse_unblock($int, $host) {
|
|
414
|
global $blockaliasname, $config;
|
|
415
|
|
|
416
|
if (!empty($host) && !empty($int)) {
|
|
417
|
$host = trim($host, "[]");
|
|
418
|
if (!is_ipaddr($host) && !is_subnet($host)) {
|
|
419
|
return gettext("Tried to unblock invalid address:") . ' ' . htmlspecialchars($host);
|
|
420
|
}
|
|
421
|
$real_int = easyrule_find_rule_interface($int);
|
|
422
|
if ($real_int === false) {
|
|
423
|
return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
|
|
424
|
}
|
|
425
|
|
|
426
|
/* Try to get the ID - will fail if there are no rules/alias on this interface */
|
|
427
|
$id = easyrule_block_alias_getid($real_int);
|
|
428
|
if ($id === false ||
|
|
429
|
empty(config_get_path("aliases/alias/{$id}", [])) ||
|
|
430
|
empty(config_get_path("aliases/alias/{$id}")['address'])) {
|
|
431
|
return gettext("No entries are blocked on interface:") . ' ' . htmlspecialchars($int);
|
|
432
|
}
|
|
433
|
|
|
434
|
$alias = config_get_path("aliases/alias/{$id}", []);
|
|
435
|
|
|
436
|
if (is_subnet($host)) {
|
|
437
|
list($host, $mask) = explode("/", $host);
|
|
438
|
} elseif (is_specialnet($host)) {
|
|
439
|
$mask = 0;
|
|
440
|
} elseif (is_ipaddrv6($host)) {
|
|
441
|
$mask = 128;
|
|
442
|
} else {
|
|
443
|
$mask = 32;
|
|
444
|
}
|
|
445
|
|
|
446
|
// Create the expected string representation
|
|
447
|
$unblock = $host.'/'.$mask;
|
|
448
|
|
|
449
|
$a_address = explode(" ", $alias['address']);
|
|
450
|
$a_detail = explode("||", $alias['detail']);
|
|
451
|
|
|
452
|
if (($key = array_search($unblock, $a_address)) !== false) {
|
|
453
|
unset($a_address[$key]);
|
|
454
|
unset($a_detail[$key]);
|
|
455
|
// Write back the result to the config array
|
|
456
|
$alias['address'] = join(" ", $a_address);
|
|
457
|
$alias['detail'] = join("||", $a_detail);
|
|
458
|
config_set_path("aliases/alias/{$id}", $alias);
|
|
459
|
|
|
460
|
// Update config
|
|
461
|
write_config(sprintf(gettext("Unblocked %s via EasyRule"), $host));
|
|
462
|
$retval = filter_configure();
|
|
463
|
if (!empty($_SERVER['DOCUMENT_ROOT'])) {
|
|
464
|
header("Location: firewall_aliases.php");
|
|
465
|
exit;
|
|
466
|
} else {
|
|
467
|
return gettext("Entry unblocked successfully");
|
|
468
|
}
|
|
469
|
} else {
|
|
470
|
return gettext("Entry is not on block list: " . $host);
|
|
471
|
}
|
|
472
|
}
|
|
473
|
|
|
474
|
return gettext("Tried to unblock but had no address or interface");
|
|
475
|
|
|
476
|
}
|
|
477
|
|
|
478
|
function easyrule_parse_getblock($int = 'wan', $sep = "\n") {
|
|
479
|
global $blockaliasname, $config;
|
|
480
|
|
|
481
|
$real_int = easyrule_find_rule_interface($int);
|
|
482
|
if ($real_int === false) {
|
|
483
|
return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
|
|
484
|
}
|
|
485
|
|
|
486
|
/* Try to get the ID - will fail if there are no rules/alias on this interface */
|
|
487
|
$id = easyrule_block_alias_getid($real_int);
|
|
488
|
|
|
489
|
if ($id === false ||
|
|
490
|
empty(config_get_path("aliases/alias/{$id}", [])) ||
|
|
491
|
empty(config_get_path("aliases/alias/{$id}")['address'])) {
|
|
492
|
return gettext("No entries are blocked on interface:") . ' ' . htmlspecialchars($int);
|
|
493
|
}
|
|
494
|
return join($sep, explode(" ", config_get_path("aliases/alias/{$id}")['address']));
|
|
495
|
}
|
|
496
|
|
|
497
|
function easyrule_parse_pass($int, $proto, $src, $dst, $dstport = 0, $ipproto = "inet") {
|
|
498
|
/* Check for valid int, srchost, dsthost, dstport, and proto */
|
|
499
|
global $protocols_with_ports;
|
|
500
|
$src = trim($src, "[]");
|
|
501
|
$dst = trim($dst, "[]");
|
|
502
|
|
|
503
|
if (!empty($int) && !empty($proto) && !empty($src) && !empty($dst)) {
|
|
504
|
$int = easyrule_find_rule_interface($int);
|
|
505
|
if ($int === false) {
|
|
506
|
return gettext("Invalid interface for pass rule:") . ' ' . htmlspecialchars($int);
|
|
507
|
}
|
|
508
|
if (($proto != 'any') &&
|
|
509
|
(getprotobyname($proto) === false) &&
|
|
510
|
(getprotobynumber($proto) === false)) {
|
|
511
|
return gettext("Invalid protocol for pass rule:") . ' ' . htmlspecialchars($proto);
|
|
512
|
}
|
|
513
|
if (!is_ipaddr($src) && !is_subnet($src) && !is_ipaddroralias($src) && !is_specialnet($src)) {
|
|
514
|
return gettext("Tried to pass invalid source IP address:") . ' ' . htmlspecialchars($src);
|
|
515
|
}
|
|
516
|
if (!is_ipaddr($dst) && !is_subnet($dst) && !is_ipaddroralias($dst) && !is_specialnet($dst)) {
|
|
517
|
return gettext("Tried to pass invalid destination IP address:") . ' ' . htmlspecialchars($dst);
|
|
518
|
}
|
|
519
|
if ((is_v6($src) && is_v4($dst)) || (is_v4($src) && is_v6($dst))) {
|
|
520
|
return gettext("The source IP address family has to match the family of the destination IP address.");
|
|
521
|
}
|
|
522
|
if (is_v6($src)) {
|
|
523
|
$ipproto = 'inet6';
|
|
524
|
} else {
|
|
525
|
$ipproto = 'inet';
|
|
526
|
}
|
|
527
|
/* If the protocol is by number, change it to a name */
|
|
528
|
if (($proto != 'any') &&
|
|
529
|
(getprotobyname($proto) === false)) {
|
|
530
|
$proto = getprotobynumber($proto);
|
|
531
|
}
|
|
532
|
if (in_array($proto, $protocols_with_ports)) {
|
|
533
|
if (empty($dstport)) {
|
|
534
|
return gettext("Missing destination port.");
|
|
535
|
}
|
|
536
|
if (!is_port($dstport) && ($dstport != "any")) {
|
|
537
|
return gettext("Tried to pass invalid destination port:") . ' ' . htmlspecialchars($dstport);
|
|
538
|
}
|
|
539
|
} else {
|
|
540
|
$dstport = 0;
|
|
541
|
}
|
|
542
|
/* Should have valid input... */
|
|
543
|
if (easyrule_pass_rule_add($int, $proto, $src, $dst, $dstport, $ipproto)) {
|
|
544
|
return gettext("Successfully added pass rule!");
|
|
545
|
} else {
|
|
546
|
return gettext("Failed to add pass rule.");
|
|
547
|
}
|
|
548
|
} else {
|
|
549
|
return gettext("Missing parameters for pass rule.");
|
|
550
|
}
|
|
551
|
return gettext("Unknown pass error.");
|
|
552
|
}
|
|
553
|
|
|
554
|
?>
|