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<?php
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/*
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* openvpn.attributes.php
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2011-2013 BSD Perimeter
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* Copyright (c) 2013-2016 Electric Sheep Fencing
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* Copyright (c) 2014-2020 Rubicon Communications, LLC (Netgate)
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* All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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global $username, $dev, $untrusted_port;
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if (empty($dev)) {
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$dev = "openvpn";
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}
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function cisco_to_cidr($addr) {
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if (!is_ipaddr($addr)) {
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throw new Exception('Invalid IP Addr');
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}
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$mask = decbin(~ip2long($addr));
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$mask = substr($mask, -32);
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$k = 0;
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for ($i = 0; $i <= 32; $i++) {
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$k += intval($mask[$i]);
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}
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return $k;
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}
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function cisco_extract_index($prule) {
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$index = explode("#", $prule);
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if (is_numeric($index[1])) {
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return intval($index[1]);
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} else {
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syslog(LOG_WARNING, "Error parsing rule {$prule}: Could not extract index");
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}
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return -1;;
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}
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function parse_cisco_acl_rule($rule, $devname, $dir) {
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$rule_orig = $rule;
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$rule = explode(" ", $rule);
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$tmprule = "";
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$index = 0;
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if ($rule[$index] == "permit") {
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$tmprule = "pass {$dir} quick on {$devname} ";
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} else if ($rule[$index] == "deny") {
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$tmprule = "block {$dir} quick on {$devname} ";
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} else {
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return;
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}
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$index++;
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switch ($rule[$index]) {
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case "ip":
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$tmprule .= "inet ";
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break;
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case "icmp":
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case "tcp":
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case "udp":
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$tmprule .= "proto {$rule[$index]} ";
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break;
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default:
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid protocol.");
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return;
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}
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$index++;
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/* Source */
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if (trim($rule[$index]) == "host") {
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$index++;
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$tmprule .= "from {$rule[$index]} ";
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$index++;
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} else if (trim($rule[$index]) == "any") {
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$tmprule .= "from any ";
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$index++;
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} else {
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$network = $rule[$index];
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$netmask = $rule[++$index];
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if(!is_ipaddr($network)) {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid source network '$network'.");
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return;
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}
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try {
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$netmask = cisco_to_cidr($netmask);
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} catch(Exception $e) {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid source netmask '$netmask'.");
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return;
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}
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$tmprule .= "from {network}/{$netmask}";
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$index++;
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}
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/* Source Operator */
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if (in_array(trim($rule[$index]), array("lt", "gt", "eq", "neq"))) {
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switch(trim($rule[$index])) {
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case "lt":
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$operator = "<";
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break;
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case "gt":
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$operator = ">";
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break;
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case "eq":
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$operator = "=";
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break;
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case "neq":
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$operator = "!=";
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break;
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}
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$port = $rule[++$index];
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if (is_port($port)) {
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$tmprule .= "port {$operator} {$port} ";
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} else {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid source port: '$port' not a numeric value between 0 and 65535.");
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return;
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}
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$index++;
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} else if (trim($rule[$index]) == "range") {
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$port = array($rule[++$index], $rule[++$index]);
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if (is_port($port[0]) && is_port($port[1])) {
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$port[0]--;
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$port[1]++;
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$tmprule .= "port {$port[0]} >< {$port[1]} ";
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} else {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid source ports: '$port[0]' & '$port[1]' one or both are not a numeric value between 0 and 65535.");
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return;
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}
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$index++;
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}
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/* Destination */
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if (trim($rule[$index]) == "host") {
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$index++;
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$tmprule .= "to {$rule[$index]} ";
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$index++;
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} else if (trim($rule[$index]) == "any") {
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$tmprule .= "to any ";
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$index++;
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} else {
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$network = $rule[$index];
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$netmask = $rule[++$index];
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if(!is_ipaddr($network)) {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid destination network '$network'.");
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return;
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}
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try {
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$netmask = cisco_to_cidr($netmask);
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} catch(Exception $e) {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid destination netmask '$netmask'.");
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return;
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}
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$tmprule .= "to {network}/{$netmask}";
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$index++;
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}
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/* Destination Operator */
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if (in_array(trim($rule[$index]), array("lt", "gt", "eq", "neq"))) {
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switch(trim($rule[$index])) {
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case "lt":
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$operator = "<";
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break;
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case "gt":
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$operator = ">";
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break;
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case "eq":
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$operator = "=";
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break;
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case "neq":
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$operator = "!=";
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break;
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}
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$port = $rule[++$index];
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if (is_port($port)) {
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$tmprule .= "port {$operator} {$port} ";
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} else {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid destination port: '$port' not a numeric value between 0 and 65535.");
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return;
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}
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$index++;
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} else if (trim($rule[$index]) == "range") {
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$port = array($rule[++$index], $rule[++$index]);
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if (is_port($port[0]) && is_port($port[1])) {
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$port[0]--;
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$port[1]++;
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$tmprule .= "port {$port[0]} >< {$port[1]} ";
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} else {
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syslog(LOG_WARNING, "Error parsing rule {$rule_orig}: Invalid destination ports: '$port[0]' '$port[1]' one or both are not a numeric value between 0 and 65535.");
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return;
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}
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$index++;
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}
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return $tmprule;
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}
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function parse_cisco_acl($attribs) {
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global $dev, $attributes;
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if (!is_array($attribs)) {
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return "";
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}
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$finalrules = "";
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if (is_array($attribs['ciscoavpair'])) {
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$inrules = array();
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$outrules = array();
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foreach ($attribs['ciscoavpair'] as $avrules) {
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$rule = explode("=", $avrules);
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$dir = "";
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if (strstr($rule[0], "inacl")) {
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$dir = "in";
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} else if (strstr($rule[0], "outacl")) {
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$dir = "out";
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} else if (strstr($rule[0], "dns-servers")) {
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$attributes['dns-servers'] = explode(" ", $rule[1]);
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continue;
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} else if (strstr($rule[0], "route")) {
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if (!is_array($attributes['routes'])) {
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$attributes['routes'] = array();
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}
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$attributes['routes'][] = $rule[1];
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continue;
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}
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$rindex = cisco_extract_index($rule[0]);
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if ($rindex < 0) {
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continue;
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}
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$tmprule = parse_cisco_acl_rule($rule[1], $dev, $dir);
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if ($dir == "in") {
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$inrules[$rindex] = $tmprule;
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} else if ($dir == "out") {
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$outrules[$rindex] = $tmprule;
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}
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}
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$state = "";
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if (!empty($outrules)) {
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$state = "no state";
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}
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ksort($inrules, SORT_NUMERIC);
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foreach ($inrules as $inrule) {
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$finalrules .= "{$inrule} {$state}\n";
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}
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if (!empty($outrules)) {
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ksort($outrules, SORT_NUMERIC);
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foreach ($outrules as $outrule) {
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$finalrules .= "{$outrule} {$state}\n";
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}
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}
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}
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return $finalrules;
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}
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$rules = parse_cisco_acl($attributes);
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if (!empty($rules)) {
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$filename = "{$g['tmp_path']}/ovpn_{$dev}_{$username}_{$untrusted_port}.rules";
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@file_put_contents($filename, $rules);
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}
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?>
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