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<?php
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/*
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easyrule.inc
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Copyright (C) 2009-2010 Jim Pingle (jpingle@gmail.com)
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Originally Sponsored By Anathematic @ pfSense Forums
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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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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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(false, true);
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if ($config['pppoe']['mode'] == "server") {
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$iflist['pppoe'] = "PPPoE Server";
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}
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if ($config['l2tp']['mode'] == "server") {
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$iflist['l2tp'] = "L2TP VPN";
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}
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/* add ipsec interfaces */
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if (ipsec_enabled()) {
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$iflist["enc0"] = "IPSEC";
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}
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if (isset($iflist[$int])) {
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return $int;
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}
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foreach ($iflist as $if => $ifd) {
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if (strtolower($int) == strtolower($ifd)) {
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return $if;
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}
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}
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if (substr($int, 0, 4) == "ovpn") {
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return "openvpn";
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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, $config;
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/* No rules, we we know it doesn't exist */
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if (!is_array($config['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['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']) ? $rule['ipprotocol'] : "inet";
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if ($rule['source']['address'] == $blockaliasname . strtoupper($int) && ($rule['interface'] == $int) && ($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 false;
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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, $ipproto)) {
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return true;
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}
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/* No rules, start a new array */
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if (!is_array($config['filter']['rule'])) {
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$config['filter']['rule'] = array();
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}
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filter_rules_sort();
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$a_filter = &$config['filter']['rule'];
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/* Make up a new rule */
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$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']['address'] = $blockaliasname . strtoupper($int);
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$filterent['destination']['any'] = '';
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$filterent['descr'] = gettext("Easy Rule: Blocked from Firewall Log View");
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$filterent['created'] = make_config_revision_entry(null, gettext("Easy Rule"));
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array_splice($a_filter, 0, 0, array($filterent));
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return true;
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}
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function easyrule_block_alias_getid($int = 'wan') {
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global $blockaliasname, $config;
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if (!is_array($config['aliases'])) {
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return false;
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}
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/* Hunt down an alias with the name we want, return its id */
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foreach ($config['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($host)) {
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return false;
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}
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/* If there are no aliases, start an array */
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if (!is_array($config['aliases']['alias'])) {
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$config['aliases']['alias'] = array();
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}
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$a_aliases = &$config['aliases']['alias'];
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/* Try to get the ID if the alias already exists */
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$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) && $a_aliases[$id]) {
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// Catch case when the list is empty
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if (empty($a_aliases[$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(" ", $a_aliases[$id]['address']);
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/* Make sure this IP isn't already in the list. */
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if (in_array($host.'/'.$mask, $a_address)) {
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return true;
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}
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$a_detail = explode("||", $a_aliases[$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'] = $a_aliases[$id]['name'];
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$alias['type'] = $a_aliases[$id]['type'];
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$alias['descr'] = $a_aliases[$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("Hosts blocked from Firewall Log view");
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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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/* 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] = $alias;
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} else {
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$a_aliases[] = $alias;
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}
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// Sort list
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$a_aliases = msort($a_aliases, "name");
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return true;
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}
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function easyrule_block_host_add($host, $int = 'wan', $ipproto = "inet") {
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global $retval;
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/* Bail if the supplied host is not a valid IP address */
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$host = trim($host, "[]");
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if (!is_ipaddr($host) && !is_subnet($host)) {
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return false;
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}
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/* Flag whether or not we need to reload the filter */
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$dirty = false;
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/* Attempt to add this host to the alias */
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if (easyrule_block_alias_add($host, $int)) {
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$dirty = true;
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} else {
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/* Couldn't add the alias, or adding the host failed. */
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return false;
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}
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/* Attempt to add the firewall rule if it doesn't exist.
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* Failing to add the rule isn't necessarily an error, it may
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* have been modified by the user in some way. Adding to the
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* Alias is what's important.
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*/
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if (!easyrule_block_rule_exists($int, $ipproto)) {
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if (easyrule_block_rule_create($int, $ipproto)) {
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$dirty = true;
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} else {
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return false;
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}
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}
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/* If needed, write the config and reload the filter */
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if ($dirty) {
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write_config();
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$retval = filter_configure();
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if (!empty($_SERVER['DOCUMENT_ROOT'])) {
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header("Location: firewall_aliases.php");
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exit;
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} else {
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return true;
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}
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} else {
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return false;
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}
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}
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function easyrule_pass_rule_add($int, $proto, $srchost, $dsthost, $dstport, $ipproto) {
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global $config;
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/* No rules, start a new array */
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if (!is_array($config['filter']['rule'])) {
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$config['filter']['rule'] = array();
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}
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filter_rules_sort();
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$a_filter = &$config['filter']['rule'];
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/* Make up a new rule */
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$filterent = array();
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$filterent['type'] = 'pass';
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$filterent['interface'] = $int;
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$filterent['ipprotocol'] = $ipproto;
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$filterent['descr'] = gettext("Easy Rule: Passed from Firewall Log View");
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292
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293
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if ($proto != "any") {
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$filterent['protocol'] = $proto;
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} else {
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unset($filterent['protocol']);
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}
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/* Default to only allow echo requests, since that's what most people want and
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* it should be a safe choice. */
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if ($proto == "icmp") {
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$filterent['icmptype'] = 'echoreq';
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}
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if ((strtolower($proto) == "icmp6") || (strtolower($proto) == "icmpv6")) {
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306
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$filterent['protocol'] = "icmp";
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}
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308
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309
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if (is_subnet($srchost)) {
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list($srchost, $srcmask) = explode("/", $srchost);
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} elseif (is_specialnet($srchost)) {
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312
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$srcmask = 0;
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313
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} elseif (is_ipaddrv6($srchost)) {
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314
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$srcmask = 128;
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315
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} else {
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316
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$srcmask = 32;
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317
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}
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318
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319
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if (is_subnet($dsthost)) {
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list($dsthost, $dstmask) = explode("/", $dsthost);
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321
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} elseif (is_specialnet($dsthost)) {
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322
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$dstmask = 0;
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323
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} elseif (is_ipaddrv6($dsthost)) {
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324
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$dstmask = 128;
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325
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} else {
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$dstmask = 32;
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}
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328
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329
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pconfig_to_address($filterent['source'], $srchost, $srcmask);
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330
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pconfig_to_address($filterent['destination'], $dsthost, $dstmask, '', $dstport, $dstport);
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331
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332
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$filterent['created'] = make_config_revision_entry(null, gettext("Easy Rule"));
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$a_filter[] = $filterent;
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334
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write_config($filterent['descr']);
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336
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$retval = filter_configure();
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337
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if (!empty($_SERVER['DOCUMENT_ROOT'])) {
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header("Location: firewall_rules.php?if={$int}");
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exit;
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340
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} else {
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341
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return true;
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342
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}
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343
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}
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344
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345
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function easyrule_parse_block($int, $src, $ipproto = "inet") {
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346
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if (!empty($src) && !empty($int)) {
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347
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$src = trim($src, "[]");
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348
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if (!is_ipaddr($src) && !is_subnet($src)) {
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349
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return gettext("Tried to block invalid IP:") . ' ' . htmlspecialchars($src);
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}
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$int = easyrule_find_rule_interface($int);
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if ($int === false) {
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return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
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}
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if (easyrule_block_host_add($src, $int, $ipproto)) {
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return gettext("Host added successfully");
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} else {
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358
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return gettext("Failed to create block rule, alias, or add host.");
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}
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360
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} else {
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361
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return gettext("Tried to block but had no host IP or interface");
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362
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}
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363
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return gettext("Unknown block error.");
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364
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}
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365
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366
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function easyrule_parse_unblock($int, $host, $ipproto = "inet") {
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|
367
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global $blockaliasname, $config;
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368
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369
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if (!empty($host) && !empty($int)) {
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370
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$host = trim($host, "[]");
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371
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if (!is_ipaddr($host) && !is_subnet($host)) {
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372
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return gettext("Tried to unblock invalid IP:") . ' ' . htmlspecialchars($host);
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373
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}
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374
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$real_int = easyrule_find_rule_interface($int);
|
|
375
|
if ($real_int === false) {
|
|
376
|
return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
|
|
377
|
}
|
|
378
|
|
|
379
|
/* Try to get the ID - will fail if there are no rules/alias on this interface */
|
|
380
|
$id = easyrule_block_alias_getid($real_int);
|
|
381
|
if ($id === false || !$config['aliases']['alias'][$id]) {
|
|
382
|
return gettext("No block rules set on interface:") . ' ' . htmlspecialchars($int);
|
|
383
|
}
|
|
384
|
|
|
385
|
$alias = &$config['aliases']['alias'][$id];
|
|
386
|
|
|
387
|
if (is_subnet($host)) {
|
|
388
|
list($host, $mask) = explode("/", $host);
|
|
389
|
} elseif (is_specialnet($host)) {
|
|
390
|
$mask = 0;
|
|
391
|
} elseif (is_ipaddrv6($host)) {
|
|
392
|
$mask = 128;
|
|
393
|
} else {
|
|
394
|
$mask = 32;
|
|
395
|
}
|
|
396
|
|
|
397
|
// Create the expected string representation
|
|
398
|
$unblock = $host.'/'.$mask;
|
|
399
|
|
|
400
|
$a_address = explode(" ", $config['aliases']['alias'][$id]['address']);
|
|
401
|
$a_detail = explode("||", $config['aliases']['alias'][$id]['detail']);
|
|
402
|
|
|
403
|
if (($key = array_search($unblock, $a_address)) !== false) {
|
|
404
|
unset($a_address[$key]);
|
|
405
|
unset($a_detail[$key]);
|
|
406
|
// Write back the result to the config array
|
|
407
|
$config['aliases']['alias'][$id]['address'] = join(" ", $a_address);
|
|
408
|
$config['aliases']['alias'][$id]['detail'] = join("||", $a_detail);
|
|
409
|
|
|
410
|
// Update config
|
|
411
|
write_config();
|
|
412
|
$retval = filter_configure();
|
|
413
|
if (!empty($_SERVER['DOCUMENT_ROOT'])) {
|
|
414
|
header("Location: firewall_aliases.php");
|
|
415
|
exit;
|
|
416
|
} else {
|
|
417
|
return gettext("Host unblocked successfully");
|
|
418
|
}
|
|
419
|
} else {
|
|
420
|
return gettext("Host ist not on block list: " . $host);
|
|
421
|
}
|
|
422
|
}
|
|
423
|
|
|
424
|
return gettext("Tried to unblock but had no host IP or interface");
|
|
425
|
|
|
426
|
}
|
|
427
|
|
|
428
|
function easyrule_parse_getblock($int = 'wan', $sep = "\n") {
|
|
429
|
global $blockaliasname, $config;
|
|
430
|
|
|
431
|
$real_int = easyrule_find_rule_interface($int);
|
|
432
|
if ($real_int === false) {
|
|
433
|
return gettext("Invalid interface for block rule:") . ' ' . htmlspecialchars($int);
|
|
434
|
}
|
|
435
|
|
|
436
|
/* Try to get the ID - will fail if there are no rules/alias on this interface */
|
|
437
|
$id = easyrule_block_alias_getid($real_int);
|
|
438
|
|
|
439
|
if ($id === false || !$config['aliases']['alias'][$id] || empty($config['aliases']['alias'][$id]['address'])) {
|
|
440
|
return gettext("No block rules set on interface:") . ' ' . htmlspecialchars($int);
|
|
441
|
}
|
|
442
|
return join($sep, explode(" ", $config['aliases']['alias'][$id]['address']));
|
|
443
|
|
|
444
|
}
|
|
445
|
|
|
446
|
function easyrule_parse_pass($int, $proto, $src, $dst, $dstport = 0, $ipproto = "inet") {
|
|
447
|
/* Check for valid int, srchost, dsthost, dstport, and proto */
|
|
448
|
global $protocols_with_ports;
|
|
449
|
$src = trim($src, "[]");
|
|
450
|
$dst = trim($dst, "[]");
|
|
451
|
|
|
452
|
if (!empty($int) && !empty($proto) && !empty($src) && !empty($dst)) {
|
|
453
|
$int = easyrule_find_rule_interface($int);
|
|
454
|
if ($int === false) {
|
|
455
|
return gettext("Invalid interface for pass rule:") . ' ' . htmlspecialchars($int);
|
|
456
|
}
|
|
457
|
if (getprotobyname($proto) == -1) {
|
|
458
|
return gettext("Invalid protocol for pass rule:") . ' ' . htmlspecialchars($proto);
|
|
459
|
}
|
|
460
|
if (!is_ipaddr($src) && !is_subnet($src) && !is_ipaddroralias($src) && !is_specialnet($src)) {
|
|
461
|
return gettext("Tried to pass invalid source IP:") . ' ' . htmlspecialchars($src);
|
|
462
|
}
|
|
463
|
if (!is_ipaddr($dst) && !is_subnet($dst) && !is_ipaddroralias($dst) && !is_specialnet($dst)) {
|
|
464
|
return gettext("Tried to pass invalid destination IP:") . ' ' . htmlspecialchars($dst);
|
|
465
|
}
|
|
466
|
if (in_array($proto, $protocols_with_ports)) {
|
|
467
|
if (empty($dstport)) {
|
|
468
|
return gettext("Missing destination port:") . ' ' . htmlspecialchars($dstport);
|
|
469
|
}
|
|
470
|
if (!is_port($dstport) && ($dstport != "any")) {
|
|
471
|
return gettext("Tried to pass invalid destination port:") . ' ' . htmlspecialchars($dstport);
|
|
472
|
}
|
|
473
|
} else {
|
|
474
|
$dstport = 0;
|
|
475
|
}
|
|
476
|
/* Should have valid input... */
|
|
477
|
if (easyrule_pass_rule_add($int, $proto, $src, $dst, $dstport, $ipproto)) {
|
|
478
|
return gettext("Successfully added pass rule!");
|
|
479
|
} else {
|
|
480
|
return gettext("Failed to add pass rule.");
|
|
481
|
}
|
|
482
|
} else {
|
|
483
|
return gettext("Missing parameters for pass rule.");
|
|
484
|
}
|
|
485
|
return gettext("Unknown pass error.");
|
|
486
|
}
|
|
487
|
|
|
488
|
?>
|