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<?php |
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/** |
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* Copyright 2016 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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public static function getFirewall4(Pools $p, $asArray = false) |
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{ |
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return self::getFirewall($p, 4, $asArray); |
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} |
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public static function getFirewall6(Pools $p, $asArray = false) |
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{ |
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return self::getFirewall($p, 6, $asArray); |
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} |
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private static function getFirewall(Pools $p, $inetFamily, $asArray) |
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{ |
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$firewall = []; |
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// NAT |
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$firewall = array_merge($firewall, self::getNat($p, $inetFamily)); |
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// FILTER |
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$firewall = array_merge($firewall, self::getFilter($p, $inetFamily)); |
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if ($asArray) { |
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return $firewall; |
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} |
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return implode(PHP_EOL, $firewall).PHP_EOL; |
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} |
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private static function getNat(Pools $p, $inetFamily) |
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{ |
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$nat = [ |
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'*nat', |
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':PREROUTING ACCEPT [0:0]', |
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':INPUT ACCEPT [0:0]', |
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':OUTPUT ACCEPT [0:0]', |
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':POSTROUTING ACCEPT [0:0]', |
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]; |
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foreach ($p as $pool) { |
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if ($pool->getUseNat()) { |
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if (4 === $inetFamily) { |
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// get the IPv4 range |
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$srcNet = $pool->getRange()->getAddressPrefix(); |
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} else { |
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// get the IPv6 range |
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$srcNet = $pool->getRange6()->getAddressPrefix(); |
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} |
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$nat[] = sprintf('-A POSTROUTING -s %s -o %s -j MASQUERADE', $srcNet, $pool->getExtIf()); |
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} |
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} |
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$nat[] = 'COMMIT'; |
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return $nat; |
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} |
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private static function getFilter(Pools $p, $inetFamily) |
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{ |
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$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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]; |
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// INPUT |
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$filter = array_merge($filter, self::getInputChain($p, $inetFamily)); |
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// FORWARD |
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$filter = array_merge($filter, self::getForwardChain($p, $inetFamily)); |
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$filter[] = 'COMMIT'; |
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return $filter; |
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} |
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private static function getInputChain(Pools $p, $inetFamily) |
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{ |
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$inputChain = [ |
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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 === $inetFamily ? 'icmp' : 'ipv6-icmp'), |
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'-A INPUT -i lo -j ACCEPT', |
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]; |
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$inputPorts = self::getIngressPorts($p); |
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foreach ($inputPorts as $inputPort) { |
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list($proto, $port) = explode('/', $inputPort); |
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$inputChain[] = sprintf('-A INPUT -m state --state NEW -m %s -p %s --dport %d -j ACCEPT', $proto, $proto, $port); |
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} |
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$inputChain[] = sprintf('-A INPUT -j REJECT --reject-with %s', 4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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return $inputChain; |
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} |
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private static function getForwardChain(Pools $p, $inetFamily) |
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{ |
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$forwardChain = [ |
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'-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT', |
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]; |
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foreach ($p as $pool) { |
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if (6 === $inetFamily && !$pool->getForward6()) { |
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// IPv6 forwarding was disabled |
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continue; |
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} |
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if (4 === $inetFamily) { |
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// get the IPv4 range |
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$srcNet = $pool->getRange()->getAddressPrefix(); |
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} else { |
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// get the IPv6 range |
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$srcNet = $pool->getRange6()->getAddressPrefix(); |
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} |
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$forwardChain[] = sprintf('-N vpn-%s', $pool->getId()); |
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$forwardChain[] = sprintf('-A FORWARD -i tun-%s+ -s %s -j vpn-%s', $pool->getId(), $srcNet, $pool->getId()); |
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// merge outgoing forwarding firewall rules to prevent certain |
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// traffic |
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$forwardChain = array_merge($forwardChain, self::getForwardFirewall($pool, $inetFamily)); |
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if ($pool->getClientToClient()) { |
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// allow client-to-client |
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$forwardChain[] = sprintf('-A vpn-%s -o tun-%s+ -d %s -j ACCEPT', $pool->getId(), $pool->getId(), $srcNet); |
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} |
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if ($pool->getDefaultGateway()) { |
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// allow traffic to all outgoing destinations |
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$forwardChain[] = sprintf('-A vpn-%s -o %s -j ACCEPT', $pool->getId(), $pool->getExtIf(), $srcNet); |
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} else { |
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// only allow certain traffic to the external interface |
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foreach ($pool->getRoutes() as $route) { |
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if ($inetFamily === $route->getFamily()) { |
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$forwardChain[] = sprintf('-A vpn-%s -o %s -d %s -j ACCEPT', $pool->getId(), $pool->getExtIf(), $route->getAddressPrefix()); |
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} |
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} |
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} |
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} |
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$forwardChain[] = sprintf('-A FORWARD -j REJECT --reject-with %s', 4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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return $forwardChain; |
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} |
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private static function getForwardFirewall(Pool $pool, $inetFamily) |
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{ |
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$forwardFirewall = []; |
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if ($pool->getBlockSmb()) { |
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// drop SMB outgoing traffic |
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// @see https://medium.com/@ValdikSS/deanonymizing-windows-users-and-capturing-microsoft-and-vpn-accounts-f7e53fe73834 |
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foreach (['tcp', 'udp'] as $proto) { |
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$forwardFirewall[] = sprintf( |
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'-A vpn-%s -o %s -m multiport -p %s --dports 137:139,445 -j REJECT --reject-with %s', |
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$pool->getId(), |
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$pool->getExtIf(), |
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$proto, |
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4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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} |
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} |
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return $forwardFirewall; |
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} |
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private static function getIngressPorts(Pools $p) |
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{ |
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$ingressPorts = ['tcp/22', 'tcp/80', 'tcp/443']; |
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// we only care about additional UDP ports, as we only want UDP and |
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// fallback to tcp/443 |
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foreach ($p as $pool) { |
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foreach ($pool->getInstances() as $instance) { |
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if ('udp' === $instance->getProto()) { |
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$port = sprintf('udp/%d', $instance->getPort()); |
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if (!in_array($port, $ingressPorts)) { |
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$ingressPorts[] = $port; |
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} |
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} |
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} |
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} |
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return $ingressPorts; |
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} |
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} |
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eduVPN /
vpn-server-api
