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<?php |
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/** |
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* Copyright 2015 François Kooman <[email protected]>. |
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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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namespace fkooman\VPN\Server; |
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class Firewall |
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{ |
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private $ipVersion; |
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private $externalIf; |
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private $useNat; |
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private $inputPorts; |
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public function __construct($ipVersion = 4, $externalIf = 'eth0', $useNat = true) |
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{ |
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$this->ipVersion = $ipVersion; |
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$this->externalIf = $externalIf; |
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$this->useNat = $useNat; |
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$this->inputPorts = []; |
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$this->pool = []; |
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} |
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private function getNat() |
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{ |
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return [ |
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'*nat', |
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':PREROUTING ACCEPT [0:0]', |
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':OUTPUT ACCEPT [0:0]', |
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':POSTROUTING ACCEPT [0:0]', |
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sprintf('-A POSTROUTING -i tun+ -o %s -j MASQUERADE', $this->externalIf), |
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'COMMIT', |
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]; |
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} |
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private function getFilter() |
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{ |
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$filter = [ |
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'*filter', |
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':INPUT ACCEPT [0:0]', |
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':FORWARD ACCEPT [0:0]', |
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':OUTPUT ACCEPT [0:0]', |
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'-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT', |
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sprintf('-A INPUT -p %s -j ACCEPT', 4 === $this->ipVersion ? 'icmp' : 'ipv6-icmp'), |
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'-A INPUT -i lo -j ACCEPT', |
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]; |
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foreach ($this->inputPorts as $inputPort) { |
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list($proto, $port) = explode('/', $inputPort); |
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$proto = strtolower($proto); |
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$filter[] = sprintf('-A INPUT -m state --state NEW -m %s -p %s --dport %d -j ACCEPT', $proto, $proto, $port); |
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} |
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$filter[] = sprintf('-A INPUT -j REJECT --reject-with %s', 4 === $this->ipVersion ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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$filter = array_merge($filter, $this->getForward()); |
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$filter[] = sprintf('-A FORWARD -j REJECT --reject-with %s', 4 === $this->ipVersion ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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$filter[] = 'COMMIT'; |
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return $filter; |
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} |
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private function getForward() |
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{ |
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$forward = [ |
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'-N vpn', |
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sprintf('-A FORWARD -i tun+ -o %s -j vpn', $this->externalIf), |
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sprintf('-A vpn -p %s -j ACCEPT', 4 === $this->ipVersion ? 'icmp' : 'ipv6-icmp'), |
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'-A vpn -m state --state ESTABLISHED,RELATED -j ACCEPT', |
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'-A vpn -m udp -p udp --dport 53 -j ACCEPT', |
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'-A vpn -m tcp -p tcp --dport 53 -j ACCEPT', |
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]; |
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foreach ($this->pool as $p) { |
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$forward = array_merge($forward, $p); |
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} |
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return $forward; |
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} |
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public function addInputPorts(array $inputPorts) |
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{ |
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$this->inputPorts = $inputPorts; |
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} |
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public function addPool($poolId, $srcNet, array $dstNets = [], array $dstPorts = []) |
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{ |
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$pool = []; |
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$pool[] = sprintf('-N %s', $poolId); |
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$pool[] = sprintf('-A vpn -s %s -j %s', $srcNet, $poolId); |
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// add rules |
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foreach ($dstNets as $dstNet) { |
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if ($this->ipVersion === self::getFamily($dstNet)) { |
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// only include dstNet if it matches FW type |
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continue; |
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} |
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if (0 !== count($dstPorts)) { |
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foreach ($dstPorts as $dstPort) { |
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list($protocol, $port) = explode('/', $dstPort); |
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$pool[] = sprintf('-A %s -d %s -m %s -p %s --dport %d -j ACCEPT', $poolId, $dstNet, strtolower($protocol), strtolower($protocol), $port); |
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} |
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} else { |
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$pool[] = sprintf('-A %s -d %s -j ACCEPT', $poolId, $dstNet); |
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} |
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} |
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$this->pool[] = $pool; |
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} |
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private static function getFamily($dstNet) |
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{ |
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return false !== strpos($dstNet, ':') ? 4 : 6; |
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} |
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public function getFirewall() |
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{ |
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$firewall = []; |
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if ($this->useNat) { |
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$firewall = array_merge($firewall, $this->getNat()); |
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} |
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$firewall = array_merge($firewall, $this->getFilter()); |
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return implode(PHP_EOL, $firewall); |
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} |
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} |
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eduVPN /
vpn-server-api
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: