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<?php
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/*
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easyrule.inc.php
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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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/*
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pfSense_BUILDER_BINARIES:
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pfSense_MODULE: filter
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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("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 ($config['pptpd']['mode'] == "server")
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$iflist['pptp'] = "PPTP VPN";
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if ($config['pppoe']['mode'] == "server")
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$iflist['pppoe'] = "PPPoE VPN";
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if ($config['l2tp']['mode'] == "server")
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$iflist['l2tp'] = "L2TP VPN";
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/* add ipsec interfaces */
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if (isset($config['ipsec']['enable']) || isset($config['ipsec']['client']['enable'])){
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$iflist["enc0"] = "IPSEC";
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}
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if (isset($iflist[$int]))
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return $int;
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foreach ($iflist as $if => $ifd) {
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if (strtolower($int) == strtolower($ifd))
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return $if;
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}
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if (substr($int, 0, 4) == "ovpn")
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return "openvpn";
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return false;
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}
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function easyrule_block_rule_exists($int = 'wan') {
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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($rule['source']))
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continue;
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if ($rule['source']['address'] == $blockaliasname . strtoupper($int) && ($rule['interface'] == $int))
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return true;
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}
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return false;
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}
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function easyrule_block_rule_create($int = 'wan') {
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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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/* If the rule already exists, no need to do it again */
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if (easyrule_block_rule_exists($int))
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return true;
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/* No rules, start a new array */
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if (!is_array($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['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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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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/* 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 $aliasid;
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return false;
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}
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function easyrule_block_alias_add($host, $int = 'wan') {
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global $blockaliasname, $config;
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/* If the host isn't a valid IP address, bail */
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if (!is_ipaddr($host) && !is_subnet($host))
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return false;
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/* If there are no aliases, start an array */
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if (!is_array($config['aliases']['alias']))
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$config['aliases']['alias'] = array();
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$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($id);
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$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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$mask = 0;
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} else {
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$mask = 32;
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}
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if (isset($id) && $a_aliases[$id]) {
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/* Make sure this IP isn't already in the list. */
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if (in_array($host.'/'.$mask, explode(" ", $a_aliases[$id]['address'])))
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return true;
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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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$alias['address'] = $a_aliases[$id]['address'] . ' ' . $host . '/' . $mask;
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$alias['detail'] = $a_aliases[$id]['detail'] . gettext('Entry added') . ' ' . date('r') . '||';
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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[] = $alias;
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// Sort list
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$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') {
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global $retval;
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/* Bail if the supplied host is not a valid IP address */
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if (!is_ipaddr($host) && !is_subnet($host))
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return false;
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/* Flag whether or not we need to reload the filter */
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$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($int)) {
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if (easyrule_block_rule_create($int)) {
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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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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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/* 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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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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$srcmask = 0;
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} else {
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$srcmask = 32;
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}
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if (is_subnet($dsthost)) {
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list($dsthost, $dstmask) = explode("/", $dsthost);
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} elseif (is_specialnet($dsthost)) {
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$dstmask = 0;
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} else {
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$dstmask = 32;
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}
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pconfig_to_address($filterent['source'], $srchost, $srcmask);
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pconfig_to_address($filterent['destination'], $dsthost, $dstmask, '', $dstport, $dstport);
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$a_filter[] = $filterent;
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write_config($filterent['descr']);
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$retval = filter_configure();
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if (!empty($_SERVER['DOCUMENT_ROOT'])) {
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header("Location: firewall_rules.php?if={$int}");
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exit;
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} else {
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return true;
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}
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}
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function easyrule_parse_block($int, $src) {
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if (!empty($src) && !empty($int)) {
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if (!is_ipaddr($src) && !is_subnet($src)) {
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return gettext("Tried to block invalid IP:") . ' ' . htmlspecialchars($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, $int)) {
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return gettext("Host added successfully");
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} else {
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return gettext("Failed to create block rule, alias, or add host.");
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}
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} else {
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return gettext("Tried to block but had no host IP or interface");
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}
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return gettext("Unknown block error.");
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}
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function easyrule_parse_pass($int, $proto, $src, $dst, $dstport = 0, $ipproto = inet) {
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/* Check for valid int, srchost, dsthost, dstport, and proto */
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global $protocols_with_ports;
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if (!empty($int) && !empty($proto) && !empty($src) && !empty($dst)) {
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$int = easyrule_find_rule_interface($int);
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if ($int === false) {
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return gettext("Invalid interface for pass rule:") . ' ' . htmlspecialchars($int);
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}
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if (getprotobyname($proto) == -1) {
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return gettext("Invalid protocol for pass rule:") . ' ' . htmlspecialchars($proto);
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}
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if (!is_ipaddr($src) && !is_subnet($src) && !is_ipaddroralias($src) && !is_specialnet($src)) {
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return gettext("Tried to pass invalid source IP:") . ' ' . htmlspecialchars($src);
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}
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if (!is_ipaddr($dst) && !is_subnet($dst) && !is_ipaddroralias($dst) && !is_specialnet($dst)) {
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return gettext("Tried to pass invalid destination IP:") . ' ' . htmlspecialchars($dst);
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}
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if (in_array($proto, $protocols_with_ports)) {
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if (empty($dstport)) {
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return gettext("Missing destination port:") . ' ' . htmlspecialchars($dstport);
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}
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if (!is_port($dstport) && ($dstport != "any")) {
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return gettext("Tried to pass invalid destination port:") . ' ' . htmlspecialchars($dstport);
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}
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} else {
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$dstport = 0;
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}
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/* Should have valid input... */
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if (easyrule_pass_rule_add($int, $proto, $src, $dst, $dstport, $ipproto)) {
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return gettext("Successfully added pass rule!");
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} else {
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return gettext("Failed to add pass rule.");
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}
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} else {
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return gettext("Missing parameters for pass rule.");
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}
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return gettext("Unknown pass error.");
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}
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?>
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