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<?php |
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/** |
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* Copyright (C) 2016 SURFnet. |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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namespace SURFnet\VPN\Server\Config; |
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use SURFnet\VPN\Common\Config; |
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use SURFnet\VPN\Server\PoolConfig; |
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use SURFnet\VPN\Server\FirewallConfig; |
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use SURFnet\VPN\Server\IP; |
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class Firewall |
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{ |
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public static function getFirewall4(array $configList, FirewallConfig $firewallConfig, $asArray = false) |
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{ |
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return self::getFirewall($configList, $firewallConfig, 4, $asArray); |
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} |
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public static function getFirewall6(array $configList, FirewallConfig $firewallConfig, $asArray = false) |
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{ |
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return self::getFirewall($configList, $firewallConfig, 6, $asArray); |
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} |
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private static function getFirewall(array $configList, FirewallConfig $firewallConfig, $inetFamily, $asArray) |
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{ |
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$firewall = []; |
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// NAT |
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$firewall = array_merge( |
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$firewall, |
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[ |
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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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); |
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// add all instances |
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foreach ($configList as $config) { |
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$firewall = array_merge($firewall, self::getNat($config, $inetFamily)); |
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} |
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$firewall[] = 'COMMIT'; |
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// FILTER |
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$firewall = array_merge( |
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$firewall, |
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[ |
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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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); |
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// INPUT |
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$firewall = array_merge($firewall, self::getInputChain($inetFamily, $firewallConfig)); |
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// FORWARD |
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$firewall = array_merge( |
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$firewall, |
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[ |
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//sprintf('-A FORWARD -p %s -j ACCEPT', 4 === $inetFamily ? 'icmp' : 'ipv6-icmp'), |
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'-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT', |
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] |
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); |
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// add all instances |
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foreach ($configList as $config) { |
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$firewall = array_merge($firewall, self::getForwardChain($config, $inetFamily)); |
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} |
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$firewall[] = sprintf('-A FORWARD -j REJECT --reject-with %s', 4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
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$firewall[] = 'COMMIT'; |
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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(Config $config, $inetFamily) |
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{ |
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$nat = []; |
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foreach (array_keys($config->v('vpnPools')) as $poolId) { |
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$poolConfig = new PoolConfig($config->v('vpnPools', $poolId)); |
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if ($poolConfig->v('useNat')) { |
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if (4 === $inetFamily) { |
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// get the IPv4 range |
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$srcNet = $poolConfig->v('range'); |
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} else { |
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// get the IPv6 range |
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$srcNet = $poolConfig->v('range6'); |
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} |
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// -i (--in-interface) cannot be specified for POSTROUTING |
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$nat[] = sprintf('-A POSTROUTING -s %s -o %s -j MASQUERADE', $srcNet, $poolConfig->v('extIf')); |
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} |
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} |
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return $nat; |
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} |
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private static function getInputChain($inetFamily, FirewallConfig $firewallConfig) |
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{ |
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$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 === $inetFamily ? 'icmp' : 'ipv6-icmp'), |
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'-A INPUT -i lo -j ACCEPT', |
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]; |
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$inputChain[] = sprintf( |
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'-A INPUT -m state --state NEW -m multiport -p udp --dports %s -j ACCEPT', |
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implode(',', $firewallConfig->v('inputChain', 'udp')) |
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); |
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$inputChain[] = sprintf( |
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'-A INPUT -m state --state NEW -m multiport -p tcp --dports %s -j ACCEPT', |
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implode(',', $firewallConfig->v('inputChain', 'tcp')) |
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); |
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// foreach($firewallConfig->v('inputChain', 'udp') as $entry) { |
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// $inputChain[] = sprintf('-A INPUT -m state --state NEW -m udp -p udp --dport %s -j ACCEPT', $entry); |
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// } |
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// foreach($firewallConfig->v('inputChain', 'tcp') as $entry) { |
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// $inputChain[] = sprintf('-A INPUT -m state --state NEW -m tcp -p tcp --dport %s -j ACCEPT', $entry); |
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// } |
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// '-A INPUT -m state --state NEW -m multiport -p tcp --dports 22,80,443 -j ACCEPT', |
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// '-A INPUT -m state --state NEW -m udp -p udp --dport 1194:1201 -j ACCEPT', |
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$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(Config $config, $inetFamily) |
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{ |
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$forwardChain = []; |
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foreach (array_keys($config->v('vpnPools')) as $poolId) { |
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$poolConfig = new PoolConfig($config->v('vpnPools', $poolId)); |
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$poolNumber = $poolConfig->v('poolNumber'); |
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if (6 === $inetFamily && !$poolConfig->v('forward6')) { |
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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 = $poolConfig->v('range'); |
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} else { |
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// get the IPv6 range |
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$srcNet = $poolConfig->v('range6'); |
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} |
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$forwardChain[] = sprintf('-N vpn-%s-%s', $config->v('instanceNumber'), $poolNumber); |
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$forwardChain[] = sprintf('-A FORWARD -i tun-%s-%s+ -s %s -j vpn-%s-%s', $config->v('instanceNumber'), $poolNumber, $srcNet, $config->v('instanceNumber'), $poolNumber); |
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// merge outgoing forwarding firewall rules to prevent certain |
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// traffic |
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$forwardChain = array_merge($forwardChain, self::getForwardFirewall($config->v('instanceNumber'), $poolNumber, $poolConfig, $inetFamily)); |
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if ($poolConfig->v('clientToClient')) { |
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// allow client-to-client |
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$forwardChain[] = sprintf('-A vpn-%s-%s -o tun-%s-%s+ -d %s -j ACCEPT', $config->v('instanceNumber'), $poolNumber, $config->v('instanceNumber'), $poolNumber, $srcNet); |
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} |
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if ($poolConfig->v('defaultGateway')) { |
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// allow traffic to all outgoing destinations |
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$forwardChain[] = sprintf('-A vpn-%s-%s -o %s -j ACCEPT', $config->v('instanceNumber'), $poolNumber, $poolConfig->v('extIf'), $srcNet); |
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} else { |
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// only allow certain traffic to the external interface |
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foreach ($poolConfig->v('routes') as $route) { |
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$routeIp = new IP($route); |
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if ($inetFamily === $routeIp->getFamily()) { |
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$forwardChain[] = sprintf('-A vpn-%s-%s -o %s -d %s -j ACCEPT', $config->v('instanceNumber'), $poolNumber, $poolConfig->v('extIf'), $route); |
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} |
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} |
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} |
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} |
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return $forwardChain; |
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} |
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private static function getForwardFirewall($instanceNumber, $poolNumber, PoolConfig $poolConfig, $inetFamily) |
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{ |
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$forwardFirewall = []; |
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if ($poolConfig->v('blockSmb')) { |
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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-%s -o %s -m multiport -p %s --dports 137:139,445 -j REJECT --reject-with %s', |
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$instanceNumber, |
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$poolNumber, |
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$poolConfig->v('extIf'), |
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$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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} |
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eduVPN /
vpn-server-api
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