/
filter.inc
4561 lines (4097 loc) · 154 KB
/
filter.inc
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<?php
/*
* filter.inc
*
* part of pfSense (https://www.pfsense.org)
* Copyright (c) 2005 Bill Marquette
* Copyright (c) 2006 Peter Allgeyer
* Copyright (c) 2008-2013 BSD Perimeter
* Copyright (c) 2013-2016 Electric Sheep Fencing
* Copyright (c) 2014-2020 Rubicon Communications, LLC (Netgate)
* All rights reserved.
*
* originally part of m0n0wall (http://m0n0.ch/wall)
* Copyright (c) 2003-2004 Manuel Kasper <mk@neon1.net>.
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* holds the items that will be executed *AFTER* the filter is fully loaded */
$after_filter_configure_run = array();
/* For installing cron job of schedules */
$time_based_rules = false;
/* Used to hold the interface list that will be used on ruleset creation. */
$FilterIflist = array();
/* Create a global array to avoid errors on rulesets. */
$GatewaysList = array();
/* Used for the hostname dns resolver */
$filterdns = array();
/* Used for aliases and interface macros */
$aliases = "";
/* ICMP v4+v6 subtypes */
$icmptypes = array(
'althost' => array('descrip' => gettext('Alternate Host'), 'valid4' => true, 'valid6' => false),
'dataconv' => array('descrip' => gettext('Datagram conversion error'), 'valid4' => true, 'valid6' => false),
'echorep' => array('descrip' => gettext('Echo reply'), 'valid4' => true, 'valid6' => true),
'echoreq' => array('descrip' => gettext('Echo request'), 'valid4' => true, 'valid6' => true),
'fqdnrep' => array('descrip' => gettext('FQDN reply'), 'valid4' => false, 'valid6' => true),
'fqdnreq' => array('descrip' => gettext('FQDN query'), 'valid4' => false, 'valid6' => true),
'groupqry' => array('descrip' => gettext('Group membership query'), 'valid4' => false, 'valid6' => true),
'grouprep' => array('descrip' => gettext('Group membership report'), 'valid4' => false, 'valid6' => true),
'groupterm' => array('descrip' => gettext('Group membership termination'), 'valid4' => false, 'valid6' => true),
'inforep' => array('descrip' => gettext('Information reply'), 'valid4' => true, 'valid6' => false),
'inforeq' => array('descrip' => gettext('Information request'), 'valid4' => true, 'valid6' => false),
'ipv6-here' => array('descrip' => gettext('IPv6 I-am-here'), 'valid4' => true, 'valid6' => false),
'ipv6-where' => array('descrip' => gettext('IPv6 where-are-you'), 'valid4' => true, 'valid6' => false),
'listendone' => array('descrip' => gettext('Multicast listener done'), 'valid4' => false, 'valid6' => true),
'listenrep' => array('descrip' => gettext('Multicast listener report'), 'valid4' => false, 'valid6' => true),
'listqry' => array('descrip' => gettext('Multicast listener query'), 'valid4' => false, 'valid6' => true),
'maskrep' => array('descrip' => gettext('Address mask reply'), 'valid4' => true, 'valid6' => false),
'maskreq' => array('descrip' => gettext('Address mask request'), 'valid4' => true, 'valid6' => false),
'mobredir' => array('descrip' => gettext('Mobile host redirect'), 'valid4' => true, 'valid6' => false),
'mobregrep' => array('descrip' => gettext('Mobile registration reply'), 'valid4' => true, 'valid6' => false),
'mobregreq' => array('descrip' => gettext('Mobile registration request'), 'valid4' => true, 'valid6' => false),
'mtrace' => array('descrip' => gettext('mtrace messages'), 'valid4' => false, 'valid6' => true),
'mtraceresp' => array('descrip' => gettext('mtrace resp'), 'valid4' => false, 'valid6' => true),
'neighbradv' => array('descrip' => gettext('Neighbor advertisement'), 'valid4' => false, 'valid6' => true),
'neighbrsol' => array('descrip' => gettext('Neighbor solicitation'), 'valid4' => false, 'valid6' => true),
'niqry' => array('descrip' => gettext('Node information request'), 'valid4' => false, 'valid6' => true),
'nirep' => array('descrip' => gettext('Node information reply'), 'valid4' => false, 'valid6' => true),
'paramprob' => array('descrip' => gettext('Parameter problem (invalid IP header)'), 'valid4' => true, 'valid6' => true),
'photuris' => array('descrip' => gettext('Photuris'), 'valid4' => true, 'valid6' => false),
'redir' => array('descrip' => gettext('Redirect'), 'valid4' => true, 'valid6' => true),
'routeradv' => array('descrip' => gettext('Router advertisement'), 'valid4' => true, 'valid6' => true),
'routersol' => array('descrip' => gettext('Router solicitation'), 'valid4' => true, 'valid6' => true),
'routrrenum' => array('descrip' => gettext('Router renumbering'), 'valid4' => false, 'valid6' => true),
'skip' => array('descrip' => gettext('SKIP'), 'valid4' => true, 'valid6' => false),
'squench' => array('descrip' => gettext('Source quench'), 'valid4' => true, 'valid6' => false),
'timerep' => array('descrip' => gettext('Timestamp reply'), 'valid4' => true, 'valid6' => false),
'timereq' => array('descrip' => gettext('Timestamp'), 'valid4' => true, 'valid6' => false),
'timex' => array('descrip' => gettext('Time exceeded'), 'valid4' => true, 'valid6' => true),
'toobig' => array('descrip' => gettext('Packet too big'), 'valid4' => false, 'valid6' => true),
'trace' => array('descrip' => gettext('Traceroute'), 'valid4' => true, 'valid6' => false),
'unreach' => array('descrip' => gettext('Destination unreachable'), 'valid4' => true, 'valid6' => true),
'wrurep' => array('descrip' => gettext('Who are you reply'), 'valid4' => false, 'valid6' => true),
'wrureq' => array('descrip' => gettext('Who are you request'), 'valid4' => false, 'valid6' => true)
);
/*
* Interfaces that can be assigned but do not directly support filtering in pf.
* Specify the driver prefix to match (from the left)
* https://redmine.pfsense.org/issues/8685
*/
global $filter_interface_blacklist;
$filter_interface_blacklist = array("ipsec");
/*
* Fixed tracker values (used to group and track usage in GUI):
*
* anti-lockout rules: 10000
* bogons rules: 11000
* RFC1918 rules: 12000
*
*/
define("ANTILOCKOUT_TRACKER", 10000);
define("BOGONS_TRACKER", 11000);
define("RFC1918_TRACKER", 12000);
define("PFLABEL_MAXLEN", 63);
define("USER_LABEL_INTRO", "USER_RULE: ");
$tracker = 1000000000;
$negate_tracker = 10000000;
function filter_rule_tracker($tracker) {
global $tracker;
return (++$tracker);
}
function filter_negaterule_tracker() {
global $negate_tracker;
++$negate_tracker;
return "tracker {$negate_tracker} ";
}
function user_rule_descr_maxlen() {
return PFLABEL_MAXLEN - strlen(USER_LABEL_INTRO);
}
function fix_rule_label($descr) {
$descr = str_replace('"', '', $descr);
if (strlen($descr) > PFLABEL_MAXLEN) {
$dots = "...";
return substr($descr, 0, PFLABEL_MAXLEN - strlen($dots)) . $dots;
} else {
return $descr;
}
}
function is_bogonsv6_used($force = false) {
global $config, $g;
# Only use bogonsv6 table if IPv6 Allow is on, and at least 1 enabled interface also has "blockbogons" enabled.
$usebogonsv6 = false;
if (isset($config['system']['ipv6allow']) || $force) {
foreach ($config['interfaces'] as $ifacedata) {
if (isset($ifacedata['enable']) && isset($ifacedata['blockbogons'])) {
$usebogonsv6 = true;
break;
}
}
}
return $usebogonsv6;
}
function filter_pflog_start($kill_first = false) {
global $config, $g;
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "filter_pflog_start() being called $mt\n";
}
if ((!file_exists("{$g['varrun_path']}/filterlog.pid")) ||
(!isvalidpid("{$g['varrun_path']}/filterlog.pid"))) {
mwexec("/usr/local/sbin/filterlog -i pflog0 -p {$g['varrun_path']}/filterlog.pid");
}
}
/* reload filter async */
function filter_configure() {
global $g;
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "filter_configure() being called $mt\n";
}
/*
* NOTE: Check here for bootup status since this should not be triggered during bootup.
* The reason is that rc.bootup calls filter_configure_sync directly which does this too.
*/
if (!platform_booting()) {
send_event("filter reload");
}
}
function filter_delete_states_for_down_gateways() {
global $config, $GatewaysList;
if (!isset($config['system']['gw_down_kill_states'])) {
return;
}
$any_gateway_down = false;
$a_gateways = return_gateways_status();
if (is_array($GatewaysList)) {
foreach ($GatewaysList as $gwname => $gateway) {
if (empty($gateway['monitor'])) {
continue;
}
if (!is_ipaddr($gateway['monitor'])) {
continue;
}
if (strstr($gateway['monitor'], "127.0.0.")) {
continue;
}
if (empty($a_gateways[$gateway['monitor']])) {
continue;
}
$gwstatus = &$a_gateways[$gateway['monitor']];
if (strstr($gwstatus['status'], "down")) {
$any_gateway_down = true;
break;
}
}
}
if ($any_gateway_down == true) {
mwexec("/sbin/pfctl -Fs");
}
}
/* reload filter sync */
function filter_configure_sync($delete_states_if_needed = true) {
global $config, $g, $after_filter_configure_run, $FilterIflist;
global $time_based_rules, $filterdns, $aliases, $dummynet_name_list;
/* Use filter lock to not allow concurrent filter reloads during this run. */
$filterlck = lock('filter', LOCK_EX);
filter_pflog_start();
update_filter_reload_status(gettext("Initializing"), true); // second argument = overwrite existing file
/* invalidate interface cache */
get_interface_arr(true);
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "filter_configure_sync() being called $mt\n";
}
/* Get interface list to work with. */
filter_generate_optcfg_array();
if (platform_booting() == true) {
echo gettext("Configuring firewall");
}
/* generate aliases */
if (platform_booting() == true) {
echo ".";
}
update_filter_reload_status(gettext("Creating aliases"));
$aliases = filter_generate_aliases();
$gateways = filter_generate_gateways();
if (platform_booting() == true) {
echo ".";
}
update_filter_reload_status(gettext("Generating Limiter rules"));
$dummynet_rules = filter_generate_dummynet_rules();
$dummynet_name_list = get_unique_dnqueue_list();
update_filter_reload_status(gettext("Generating NAT rules"));
/* generate nat rules */
$natrules = filter_nat_rules_generate();
if (platform_booting() == true) {
echo ".";
}
update_filter_reload_status(gettext("Generating filter rules"));
/* generate pfctl rules */
$pfrules = filter_rules_generate();
/* generate altq, limiter */
if (platform_booting() == true) {
echo ".";
}
update_filter_reload_status(gettext("Generating ALTQ queues"));
$altq_queues = filter_generate_altq_queues();
if (platform_booting() == true) {
echo ".";
}
update_filter_reload_status(gettext("Loading filter rules"));
/* enable pf if we need to, otherwise disable */
if (!isset ($config['system']['disablefilter'])) {
mwexec("/sbin/pfctl -e", true);
} else {
mwexec("/sbin/pfctl -d", true);
unlink_if_exists("{$g['tmp_path']}/filter_loading");
update_filter_reload_status(gettext("Filter is disabled. Not loading rules."));
if (platform_booting() == true) {
echo gettext("done.") . "\n";
}
unlock($filterlck);
return;
}
$limitrules = "";
/* User defined maximum table entries in Advanced menu. */
if ($config['system']['maximumtableentries'] <> "" && is_numeric($config['system']['maximumtableentries'])) {
$limitrules .= "set limit table-entries {$config['system']['maximumtableentries']}\n";
}
if ($config['system']['optimization'] <> "") {
$limitrules .= "set optimization {$config['system']['optimization']}\n";
if ($config['system']['optimization'] == "conservative") {
$limitrules .= "set timeout { udp.first 300, udp.single 150, udp.multiple 900 }\n";
}
} else {
$limitrules .= "set optimization normal\n";
}
$timeoutlist = "";
if (isset($config['system']['tcpfirsttimeout']) && is_numericint($config['system']['tcpfirsttimeout'])) {
$timeoutlist .= " tcp.first {$config['system']['tcpfirsttimeout']} ";
}
if (isset($config['system']['tcpopeningtimeout']) && is_numericint($config['system']['tcpopeningtimeout'])) {
$timeoutlist .= " tcp.opening {$config['system']['tcpopeningtimeout']} ";
}
if (isset($config['system']['tcpestablishedtimeout']) && is_numericint($config['system']['tcpestablishedtimeout'])) {
$timeoutlist .= " tcp.established {$config['system']['tcpestablishedtimeout']} ";
}
if (isset($config['system']['tcpclosingtimeout']) && is_numericint($config['system']['tcpclosingtimeout'])) {
$timeoutlist .= " tcp.closing {$config['system']['tcpclosingtimeout']} ";
}
if (isset($config['system']['tcpfinwaittimeout']) && is_numericint($config['system']['tcpfinwaittimeout'])) {
$timeoutlist .= " tcp.finwait {$config['system']['tcpfinwaittimeout']} ";
}
if (isset($config['system']['tcpclosedtimeout']) && is_numericint($config['system']['tcpclosedtimeout'])) {
$timeoutlist .= " tcp.closed {$config['system']['tcpclosedtimeout']} ";
}
if (isset($config['system']['udpfirsttimeout']) && is_numericint($config['system']['udpfirsttimeout'])) {
$timeoutlist .= " udp.first {$config['system']['udpfirsttimeout']} ";
}
if (isset($config['system']['udpsingletimeout']) && is_numericint($config['system']['udpsingletimeout'])) {
$timeoutlist .= " udp.single {$config['system']['udpsingletimeout']} ";
}
if (isset($config['system']['udpmultipletimeout']) && is_numericint($config['system']['udpmultipletimeout'])) {
$timeoutlist .= " udp.multiple {$config['system']['udpmultipletimeout']} ";
}
if (isset($config['system']['icmpfirsttimeout']) && is_numericint($config['system']['icmpfirsttimeout'])) {
$timeoutlist .= " icmp.first {$config['system']['icmpfirsttimeout']} ";
}
if (isset($config['system']['icmperrortimeout']) && is_numericint($config['system']['icmperrortimeout'])) {
$timeoutlist .= " icmp.error {$config['system']['icmperrortimeout']} ";
}
if (isset($config['system']['otherfirsttimeout']) && is_numericint($config['system']['otherfirsttimeout'])) {
$timeoutlist .= " other.first {$config['system']['otherfirsttimeout']} ";
}
if (isset($config['system']['othersingletimeout']) && is_numericint($config['system']['othersingletimeout'])) {
$timeoutlist .= " other.single {$config['system']['othersingletimeout']} ";
}
if (isset($config['system']['othermultipletimeout']) && is_numericint($config['system']['othermultipletimeout'])) {
$timeoutlist .= " other.multiple {$config['system']['othermultipletimeout']} ";
}
if ($timeoutlist <> "") {
$limitrules .= "set timeout { $timeoutlist }\n";
}
if (is_numericint($config['system']['adaptivestart']) && is_numericint($config['system']['adaptiveend'])) {
$limitrules .= "set timeout { adaptive.start {$config['system']['adaptivestart']}, adaptive.end {$config['system']['adaptiveend']} }\n";
}
if ($config['system']['maximumstates'] <> "" && is_numeric($config['system']['maximumstates'])) {
/* User defined maximum states in Advanced menu. */
$limitrules .= "set limit states {$config['system']['maximumstates']}\n";
$limitrules .= "set limit src-nodes {$config['system']['maximumstates']}\n";
} else {
$max_states = pfsense_default_state_size();
$limitrules .= "set limit states {$max_states}\n";
$limitrules .= "set limit src-nodes {$max_states}\n";
}
/* Frag limit. pf default is 5000 */
if ($config['system']['maximumfrags'] <> "" && is_numeric($config['system']['maximumfrags'])) {
$limitrules .= "set limit frags {$config['system']['maximumfrags']}\n";
}
if (isset($config['system']['lb_use_sticky']) && is_numeric($config['system']['srctrack']) && ($config['system']['srctrack'] > 0)) {
$limitrules .= "set timeout src.track {$config['system']['srctrack']}\n";
}
$rules = "";
$rules = "{$limitrules}\n";
$rules .= "{$aliases} \n";
$rules .= "{$gateways} \n";
update_filter_reload_status(gettext("Setting up logging information"));
$rules .= filter_setup_logging_interfaces();
$rules .= "\n";
$rules .= "set skip on pfsync0\n";
$rules .= "\n";
update_filter_reload_status(gettext("Setting up SCRUB information"));
$rules .= filter_generate_scrubing();
$rules .= "\n";
$rules .= "{$altq_queues}\n";
$rules .= "{$natrules}\n";
$rules .= "{$pfrules}\n";
$rules .= discover_pkg_rules("filter");
unset($aliases, $gateways, $altq_queues, $natrules, $pfrules);
// Copy rules.debug to rules.debug.old
if (file_exists("{$g['tmp_path']}/rules.debug")) {
@copy("{$g['tmp_path']}/rules.debug", "{$g['tmp_path']}/rules.debug.old");
}
if (!@file_put_contents("{$g['tmp_path']}/rules.debug", $rules, LOCK_EX)) {
log_error("WARNING: Could not write new rules!");
unlock($filterlck);
return;
}
@file_put_contents("{$g['tmp_path']}/rules.limits", $limitrules);
mwexec("/sbin/pfctl -Of {$g['tmp_path']}/rules.limits");
unset($rules, $limitrules);
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "pfctl being called at $mt\n";
}
for ($pfctl_try = 1; $pfctl_try <= 10; $pfctl_try++) {
unset($rules_loading, $rules_error);
$_grbg = exec("/sbin/pfctl -o basic -f {$g['tmp_path']}/rules.debug 2>&1", $rules_error, $rules_loading);
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "pfctl done at $mt\n";
}
if ($rules_loading == 0) {
// continue when successful
if (isset($config['system']['developerspew']) && $pfctl_try > 1) {
file_notice("filter_load", sprintf(gettext('pf was busy but succeeded after %s tries'), $pfctl_try), "Filter Reload", "");
}
break;
}
if (strstr($_grbg, "DIOCADDALTQ: Device busy") ||
strstr($_grbg, "DIOCADDRULE: Device busy") ||
strstr($_grbg, "DIOCXCOMMIT: Device busy")) {
// when busy status is returned retry after a short pause
usleep(200000);//try again after 200 ms..unless it still fails after 10x
} else {
// rule loading failed, no need to retry with the same ruleset
break;
}
}
/*
* check for a error while loading the rules file. if an error has occurred
* then output the contents of the error to the caller
*/
if ($rules_loading <> 0) {
foreach ($rules_error as $errorline) {
$saved_line_error = $errorline;
$line_error = explode(":", $errorline);
$line_number = $line_error[1];
$line_split = file("{$g['tmp_path']}/rules.debug");
if (is_array($line_split)) {
$line_error = sprintf(gettext('The line in question reads [%1$d]: %2$s'), $line_number, $line_split[(int) $line_number - 1]);
}
unset($line_split);
/* Brutal ugly hack but required -- PF is stuck, unwedge */
if (strstr("$rules_error[0]", "busy")) {
exec("/sbin/pfctl -d; /sbin/pfctl -e; /sbin/pfctl -f {$g['tmp_path']}/rules.debug");
$error_msg = gettext("PF was wedged/busy and has been reset.");
file_notice("pf_busy", $error_msg, "pf_busy", "");
} else {
$_grbg = exec("/sbin/pfctl -o basic -f {$g['tmp_path']}/rules.debug.old 2>&1");
}
if ($line_error and $line_number) {
file_notice("filter_load", sprintf(gettext('There were error(s) loading the rules: %1$s - %2$s'), $saved_line_error, $line_error), "Filter Reload", "");
update_filter_reload_status(sprintf(gettext('There were error(s) loading the rules: %1$s - %2$s'), $saved_line_error, $line_error));
unlock($filterlck);
return;
}
}
unset($rules_loading, $rules_error);
}
# If we are not using bogonsv6 then we can remove any bogonsv6 table from the running pf (if the table is not there, the kill is still fine).
if (!is_bogonsv6_used()) {
$_grbg = exec("/sbin/pfctl -t bogonsv6 -T kill 2>/dev/null");
}
global $reserved_table_names;
// get aliases names from config
$aliasesnames = array();
init_config_arr(array('aliases', 'alias'));
foreach ($config['aliases']['alias'] as $alias) {
array_push($aliasesnames, $alias['name']);
}
// get aliases names from pfctl -sT
exec("/sbin/pfctl -sT", $pftables);
// compare config with pfctl aliases and reserved table names
$diff = array_diff($pftables, $aliasesnames, $reserved_table_names);
// delete unused aliases
foreach ($diff as $alias) {
$_grbg = exec("/sbin/pfctl -t " . escapeshellarg($alias) . " -T kill 2>/dev/null");
}
if (!platform_booting()) {
if (!empty($filterdns)) {
@file_put_contents("{$g['varetc_path']}/filterdns.conf", implode("", $filterdns));
unset($filterdns);
if (isvalidpid("{$g['varrun_path']}/filterdns.pid")) {
sigkillbypid("{$g['varrun_path']}/filterdns.pid", "HUP");
} else {
/*
* FilterDNS has three debugging levels. The default chosen is 1.
* Available are level 2 and greater then 2.
*/
if (isset($config['system']['aliasesresolveinterval']) && is_numeric($config['system']['aliasesresolveinterval'])) {
$resolve_interval = $config['system']['aliasesresolveinterval'];
} else {
$resolve_interval = 300;
}
mwexec("/usr/local/sbin/filterdns -p {$g['varrun_path']}/filterdns.pid -i {$resolve_interval} -c {$g['varetc_path']}/filterdns.conf -d 1");
}
} else {
killbypid("{$g['varrun_path']}/filterdns.pid");
@unlink("{$g['varrun_path']}/filterdns.pid");
}
}
/* run items scheduled for after filter configure run */
$fda = fopen("{$g['tmp_path']}/commands.txt", "w");
if ($fda) {
if ($after_filter_configure_run) {
foreach ($after_filter_configure_run as $afcr) {
fwrite($fda, $afcr . "\n");
}
unset($after_filter_configure_run);
}
/*
* we need a way to let a user run a shell cmd after each
* filter_configure() call. run this xml command after
* each change.
*/
if ($config['system']['afterfilterchangeshellcmd'] <> "") {
fwrite($fda, $config['system']['afterfilterchangeshellcmd'] . "\n");
}
fclose($fda);
}
if (file_exists("{$g['tmp_path']}/commands.txt")) {
mwexec("sh {$g['tmp_path']}/commands.txt &");
unlink("{$g['tmp_path']}/commands.txt");
}
/* if time based rules are enabled then swap in the set */
if ($time_based_rules == true) {
filter_tdr_install_cron(true);
} else {
filter_tdr_install_cron(false);
}
if (platform_booting() == true) {
echo ".";
}
if ($delete_states_if_needed) {
update_filter_reload_status(gettext("Processing down interface states"));
filter_delete_states_for_down_gateways();
}
update_filter_reload_status(gettext("Running plugins"));
if (is_dir("/usr/local/pkg/pf/")) {
/* process packager manager custom rules */
update_filter_reload_status(gettext("Running plugins (pf)"));
run_plugins("/usr/local/pkg/pf/");
update_filter_reload_status(gettext("Plugins completed."));
}
update_filter_reload_status(gettext("Done"));
if (platform_booting() == true) {
echo gettext("done.") . "\n";
}
unlock($filterlck);
return 0;
}
function filter_generate_scrubing() {
global $config, $FilterIflist;
$scrubrules = "";
if (isset($config['system']['maxmss_enable'])) {
$maxmss = 1400;
if (!empty($config['system']['maxmss'])) {
$maxmss = $config['system']['maxmss'];
}
$scrubrules .= "scrub from any to <vpn_networks> max-mss {$maxmss}\n";
$scrubrules .= "scrub from <vpn_networks> to any max-mss {$maxmss}\n";
}
/* disable scrub option */
foreach ($FilterIflist as $scrubif => $scrubcfg) {
if (isset($scrubcfg['virtual']) || empty($scrubcfg['descr'])) {
continue;
}
/* set up MSS clamping */
if (($scrubcfg['mss'] <> "") &&
(is_numeric($scrubcfg['mss']))) {
$mssclamp = "max-mss " . (intval($scrubcfg['mss'] - 40));
} else {
$mssclamp = "";
}
/* configure no-df for linux nfs and others */
if ($config['system']['scrubnodf']) {
$scrubnodf = "no-df";
} else {
$scrubnodf = "";
}
if ($config['system']['scrubrnid']) {
$scrubrnid = "random-id";
} else {
$scrubrnid = "";
}
if (!isset($config['system']['disablescrub'])) {
$scrubrules .= "scrub on \${$scrubcfg['descr']} all {$scrubnodf} {$scrubrnid} {$mssclamp} fragment reassemble\n"; // reassemble all directions
} else if (!empty($mssclamp)) {
$scrubrules .= "scrub on \${$scrubcfg['descr']} {$mssclamp}\n";
}
}
return $scrubrules;
}
function filter_generate_nested_alias($name) {
global $aliastable;
$aliasnesting = array();
$aliasaddrnesting = array();
if (($name == "") || !isset($aliastable[$name])) {
return "";
}
return filter_generate_nested_alias_recurse($name, $aliastable[$name], $aliasnesting, $aliasaddrnesting);
}
function filter_generate_nested_alias_recurse($name, $alias, &$aliasnesting, &$aliasaddrnesting, &$use_filterdns = false) {
global $aliastable, $filterdns;
$addresses = explode(" ", $alias);
$finallist = "";
$builtlist = "";
$urltable_nesting = "";
$aliasnesting[$name] = $name;
$alias_type = alias_get_type($name);
foreach ($addresses as $address) {
if (empty($address)) {
continue;
}
$linelength = strlen($builtlist);
$tmpline = "";
if (is_alias($address)) {
if (alias_get_type($address) == 'urltable') {
// Feature#1603. For this type of alias we do not need to recursively call filter_generate_nested_alias_recurse. Just load IPs from the file.
$urltable_nesting = alias_expand_urltable($address);
if (!empty($urltable_nesting)) {
$urlfile_as_arr = file($urltable_nesting);
foreach ($urlfile_as_arr as $line) {
$address= rtrim($line);
if ((strlen($tmpline) + $linelength) > 4036) {
$finallist .= "{$tmpline} \\\n";
$tmpline = "";
}
$tmpline .= " {$address}";
}
}
}
/* We already expanded this alias so there is no necessity to do it again. */
else if (!isset($aliasnesting[$address])) {
$tmpline = filter_generate_nested_alias_recurse($name, $aliastable[$address], $aliasnesting, $aliasaddrnesting, $use_filterdns);
}
} else if (!isset($aliasaddrnesting[$address])) {
if (!is_ipaddr($address) && !is_subnet($address) && !((($alias_type == 'port') || ($alias_type == 'url_ports')) && is_port_or_range($address)) && is_hostname($address)) {
$use_filterdns = true;
if (!isset($filterdns["{$address}{$name}"])) {
$filterdns["{$address}{$name}"] = "pf {$address} {$name}\n";
}
continue;
}
$aliasaddrnesting[$address] = $address;
$tmpline = " {$address}";
}
if ((strlen($tmpline)+ $linelength) > 4036) {
$finallist .= "{$builtlist} \\\n";
$builtlist = "";
}
if (!empty($tmpline)) {
$builtlist .= " {$tmpline}";
}
}
$finallist .= $builtlist;
if ($use_filterdns === true && !empty($finallist)) {
foreach (explode(" ", $finallist) as $address) {
if (empty($address)) {
continue;
}
if ((is_ipaddr($address) || is_subnet($address)) && !isset($filterdns["{$address}{$name}"])) {
$filterdns["{$address}{$name}"] = "pf {$address} {$name}\n";
}
}
$finallist = '';
}
return $finallist;
}
function filter_expand_alias($alias_name) {
global $config;
if (isset($config['aliases']['alias'])) {
foreach ($config['aliases']['alias'] as $aliased) {
if ($aliased['name'] == $alias_name) {
return filter_generate_nested_alias($aliased['name']);
}
}
}
}
function filter_expand_alias_array($alias_name) {
$expansion = filter_expand_alias($alias_name);
return explode(" ", preg_replace('/\s+/', ' ', trim($expansion)));
}
function filter_generate_aliases() {
global $g, $config, $FilterIflist, $after_filter_configure_run;
if (isset($config['system']['developerspew'])) {
$mt = microtime();
echo "filter_generate_aliases() being called $mt\n";
}
$alias = "#System aliases\n ";
$aliases = "loopback = \"{ lo0 }\"\n";
foreach ($FilterIflist as $if => $ifcfg) {
if (is_array($ifcfg[0])) {
if ($ifcfg[0]['if'] == 'pppoe') {
$aliases .= "{$ifcfg[0]['descr']} = \"{ {$ifcfg[0]['if']}";
$aliases .= " }\"\n";
}
} elseif (!empty($ifcfg['descr']) && !empty($ifcfg['if'])) {
if ($ifcfg['type6'] == '6rd') {
$aliases .= "{$ifcfg['descr']} = \"{ {$ifcfg['if']} {$if}_stf";
} else if ($ifcfg['type6'] == '6to4') {
$aliases .= "{$ifcfg['descr']} = \"{ {$ifcfg['if']} {$if}_stf";
} else {
$aliases .= "{$ifcfg['descr']} = \"{ {$ifcfg['if']}";
if ($ifcfg['type'] == 'pptp') {
foreach (get_parent_interface($ifcfg['if']) as $parent_if) {
if ($parent_if != $ifcfg['if']) {
$aliases .= " {$parent_if}";
}
}
}
}
$aliases .= " }\"\n";
}
}
$aliases .= "\n#SSH Lockout Table\n";
$aliases .= "table <sshguard> persist\n";
$aliases .= "#Snort tables\n";
$aliases .= "table <snort2c>\n";
$aliases .= "table <virusprot>\n";
if (!file_exists("/etc/bogons") || !file_exists("/etc/bogonsv6")) {
if (!file_exists("/etc/bogons")) {
@file_put_contents("/etc/bogons", "");
}
if (!file_exists("/etc/bogonsv6")) {
@file_put_contents("/etc/bogonsv6", "");
}
}
$aliases .= "table <bogons> persist file \"/etc/bogons\"\n";
if (is_bogonsv6_used()) {
if (!isset($config['system']['maximumtableentries']) ||
$config['system']['maximumtableentries'] <
$g['minimumtableentries_bogonsv6']) {
file_notice("Filter_Reload", sprintf(gettext(
"To block bogon IPv6 networks the Firewall Maximum Table Entries value in System / Advanced / Firewall must be increased at least to %s"),
$g['minimumtableentries_bogonsv6']));
} else {
$aliases .= "table <bogonsv6> persist file \"/etc/bogonsv6\"\n";
}
}
$vpns_list = filter_get_vpns_list();
if ($vpns_list) {
$aliases .= "table <vpn_networks> { $vpns_list }\n";
}
/* add a Negate_networks table */
$aliases .= "table <negate_networks> ";
if ($vpns_list) {
$aliases .= "{ $vpns_list }";
}
$aliases .= "\n";
$aliases .= "\n# User Aliases \n";
/* Setup pf groups */
if (isset($config['aliases']['alias'])) {
foreach ($config['aliases']['alias'] as $aliased) {
if (is_numericint($aliased['name'])) {
// skip aliases with numeric-only names. redmine #4289
file_notice("Filter_Reload", sprintf(gettext("Aliases with numeric-only names are not valid. Skipping alias %s"), $aliased['name']));
continue;
}
$addrlist = filter_generate_nested_alias($aliased['name']);
switch ($aliased['type']) {
case "host":
case "network":
case "url":
$tableaddrs = "{$addrlist}";
if (empty($tableaddrs)) {
$aliases .= "table <{$aliased['name']}> persist\n";
if (empty($aliased['address'])) {
$after_filter_configure_run[] = "/sbin/pfctl -T flush -t " . escapeshellarg($aliased['name']);
}
} else {
$aliases .= "table <{$aliased['name']}> { {$addrlist} } \n";
}
$aliases .= "{$aliased['name']} = \"<{$aliased['name']}>\"\n";
break;
case "urltable":
$urlfn = alias_expand_urltable($aliased['name']);
if ($urlfn) {
$aliases .= "table <{$aliased['name']}> persist file \"{$urlfn}\"\n";
$aliases .= "{$aliased['name']} = \"<{$aliased['name']}>\"\n";
}
break;
case "urltable_ports":
// TODO: Change it when pf supports tables with ports
$urlfn = alias_expand_urltable($aliased['name']);
if ($urlfn) {
$ports_tmp = parse_aliases_file($urlfn, "urltable_ports", "-1", false);
$aliases .= "{$aliased['name']} = \"{ " . preg_replace("/\n/", " ", implode("\n", $ports_tmp)) . " }\"\n";
}
break;
case "port":
case "url_ports":
$aliases .= "{$aliased['name']} = \"{ {$addrlist} }\"\n";
break;
default:
$aliases .= "{$aliased['name']} = \"{ {$aliased['address']} }\"\n";
break;
}
}
}
$result = "{$alias} \n";
$result .= "{$aliases}";
return $result;
}
function filter_generate_gateways() {
global $config, $g, $GatewaysList;
$rules = "# Gateways\n";
update_filter_reload_status(gettext("Creating gateway group item..."));
/* Lookup Gateways to be used in filter rules once */
$GatewaysList = return_gateways_array();
$GatewayGroupsList = return_gateway_groups_array(true);
if (is_array($GatewaysList)) {
foreach ($GatewaysList as $gwname => $gateway) {
$int = $gateway['interface'];
$gwip = $gateway['gateway'];
$route = "";
if (!is_ipaddr($gwip)) {
$gwip = get_interface_gateway($gateway['friendlyiface']);
}
if (is_ipaddr($gwip) && !empty($int) && !isset($gateway['force_down'])) {
$route = "route-to ( {$int} {$gwip} )";
}
if (($route === "") && isset($config['system']['skip_rules_gw_down'])) {
unset($GatewaysList[$gwname]);
} else {
$rules .= "GW{$gwname} = \" {$route} \"\n";
}
}
}
if (is_array($GatewayGroupsList)) {
foreach ($GatewayGroupsList as $gateway => $members) {
$route = "";
/* hey, that's not a group member! */
unset($members['ipprotocol']);
unset($members['descr']);
if (count($members) > 0) {
$foundlb = 0;
$routeto = "";
$routetomembers = 0;
foreach ($members as $idx => $member) {
$int = $member['int'];
$gatewayip = $member['gwip'];
if (($int <> "") && is_ipaddr($gatewayip)) {
if ($g['debug']) {
log_error(sprintf(gettext('Setting up route with %1$s on %2$s'), $gatewayip, $int));
}
if ($routetomembers + (int) $member['weight'] > 384) {
// would create invalid ruleset, bail
log_error(sprintf(gettext("Too many members in group %s, gateway group truncated in ruleset."), $member['name']));
continue;
}
if ((int) $member['weight'] > 1) {
$routeto .= str_repeat("( {$int} {$gatewayip} ) ", $member['weight']);
$routetomembers += (int) $member['weight'];
} else {
$routeto .= "( {$int} {$gatewayip} ) ";
$routetomembers++;
}
$foundlb++;
} else {
log_error(sprintf(gettext("An error occurred while trying to find the interface got %s . The rule has not been added."), $gatewayip));
}
}
$route = "";
if ($foundlb > 0) {
$route = " route-to { {$routeto} } ";
if ($foundlb > 1) {
$route .= " round-robin ";
if (isset($config['system']['lb_use_sticky'])) {
$route .= " sticky-address ";
}
}
}
}
if (($route === "") && isset($config['system']['skip_rules_gw_down'])) {
unset($GatewayGroupsList[$gateway]);
} else {
$rules .= "GW{$gateway} = \" {$route} \"\n";
}
}
}
/* Create a global array to avoid errors on rulesets. */
$GatewaysList = $GatewaysList + $GatewayGroupsList;
$rules .= "\n";
return $rules;
}
/* returns space separated list of vpn subnets */
function filter_get_vpns_list() {
global $config;
$vpns = "";
$vpns_arr = array();
/* ipsec */
if (!function_exists('ipsec_enabled')) {
require_once("ipsec.inc");
}
if (ipsec_enabled()) {
/* Include mobile IPsec client subnet in the VPN network list.
See https://redmine.pfsense.org/issues/7005 */
if (is_array($config['ipsec']['client'])
&& isset($config['ipsec']['client']['enable'])
&& isset($config['ipsec']['client']['pool_address'])
&& isset($config['ipsec']['client']['pool_netbits'])) {
$client_subnet = "{$config['ipsec']['client']['pool_address']}/{$config['ipsec']['client']['pool_netbits']}";
if (is_subnet($client_subnet)) {
$vpns_arr[] = $client_subnet;
}
}
if (is_array($config['ipsec']['phase2'])) {
foreach ($config['ipsec']['phase2'] as $ph2ent) {
if ((!$ph2ent['mobile']) && ($ph2ent['mode'] != 'transport') &&
!isset($ph2ent['disabled'])) {
if (!is_array($ph2ent['remoteid'])) {
continue;
}
$ph2ent['remoteid']['mode'] = $ph2ent['mode'];
$vpns_subnet = ipsec_idinfo_to_cidr($ph2ent['remoteid']);
if (!is_subnet($vpns_subnet) || $vpns_subnet == "0.0.0.0/0") {
continue;
}
$vpns_arr[] = $vpns_subnet;
}
}
}
}
/* openvpn */
foreach (array('client', 'server') as $type) {
if (is_array($config['openvpn']["openvpn-$type"])) {