|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* Copyright 2016 François Kooman <[email protected]>. |
|
4
|
|
|
* |
|
5
|
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); |
|
6
|
|
|
* you may not use this file except in compliance with the License. |
|
7
|
|
|
* You may obtain a copy of the License at |
|
8
|
|
|
* |
|
9
|
|
|
* http://www.apache.org/licenses/LICENSE-2.0 |
|
10
|
|
|
* |
|
11
|
|
|
* Unless required by applicable law or agreed to in writing, software |
|
12
|
|
|
* distributed under the License is distributed on an "AS IS" BASIS, |
|
13
|
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
14
|
|
|
* See the License for the specific language governing permissions and |
|
15
|
|
|
* limitations under the License. |
|
16
|
|
|
*/ |
|
17
|
|
|
|
|
18
|
|
|
namespace fkooman\VPN\Server; |
|
19
|
|
|
|
|
20
|
|
|
class Firewall |
|
21
|
|
|
{ |
|
22
|
|
|
public static function getFirewall4(Pools $p, $disableForward = false, $asArray = false) |
|
23
|
|
|
{ |
|
24
|
|
|
return self::getFirewall($p, 4, $disableForward, $asArray); |
|
25
|
|
|
} |
|
26
|
|
|
|
|
27
|
|
|
public static function getFirewall6(Pools $p, $disableForward = false, $asArray = false) |
|
28
|
|
|
{ |
|
29
|
|
|
return self::getFirewall($p, 6, $disableForward, $asArray); |
|
30
|
|
|
} |
|
31
|
|
|
|
|
32
|
|
|
private static function getFirewall(Pools $p, $inetFamily, $disableForward, $asArray) |
|
33
|
|
|
{ |
|
34
|
|
|
$firewall = []; |
|
35
|
|
|
|
|
36
|
|
|
// NAT |
|
37
|
|
|
$firewall = array_merge($firewall, self::getNat($p, $inetFamily)); |
|
38
|
|
|
|
|
39
|
|
|
// FILTER |
|
40
|
|
|
$firewall = array_merge($firewall, self::getFilter($p, $inetFamily, $disableForward)); |
|
41
|
|
|
|
|
42
|
|
|
if ($asArray) { |
|
43
|
|
|
return $firewall; |
|
44
|
|
|
} |
|
45
|
|
|
|
|
46
|
|
|
return implode(PHP_EOL, $firewall).PHP_EOL; |
|
47
|
|
|
} |
|
48
|
|
|
|
|
49
|
|
|
private static function getNat(Pools $p, $inetFamily) |
|
50
|
|
|
{ |
|
51
|
|
|
$nat = [ |
|
52
|
|
|
'*nat', |
|
53
|
|
|
':PREROUTING ACCEPT [0:0]', |
|
54
|
|
|
':INPUT ACCEPT [0:0]', |
|
55
|
|
|
':OUTPUT ACCEPT [0:0]', |
|
56
|
|
|
':POSTROUTING ACCEPT [0:0]', |
|
57
|
|
|
]; |
|
58
|
|
|
|
|
59
|
|
|
foreach ($p as $pool) { |
|
60
|
|
|
if ($pool->getUseNat()) { |
|
61
|
|
|
if (4 === $inetFamily) { |
|
62
|
|
|
// get the IPv4 range |
|
63
|
|
|
$srcNet = $pool->getRange()->getAddressPrefix(); |
|
64
|
|
|
} else { |
|
65
|
|
|
// get the IPv6 range |
|
66
|
|
|
$srcNet = $pool->getRange6()->getAddressPrefix(); |
|
67
|
|
|
} |
|
68
|
|
|
$nat[] = sprintf('-A POSTROUTING -s %s -o %s -j MASQUERADE', $srcNet, $pool->getExtIf()); |
|
69
|
|
|
} |
|
70
|
|
|
} |
|
71
|
|
|
$nat[] = 'COMMIT'; |
|
72
|
|
|
|
|
73
|
|
|
return $nat; |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
private static function getFilter(Pools $p, $inetFamily, $disableForward) |
|
77
|
|
|
{ |
|
78
|
|
|
$filter = [ |
|
79
|
|
|
'*filter', |
|
80
|
|
|
':INPUT ACCEPT [0:0]', |
|
81
|
|
|
':FORWARD ACCEPT [0:0]', |
|
82
|
|
|
':OUTPUT ACCEPT [0:0]', |
|
83
|
|
|
]; |
|
84
|
|
|
|
|
85
|
|
|
// INPUT |
|
86
|
|
|
$filter = array_merge($filter, self::getInputChain($p, $inetFamily)); |
|
87
|
|
|
|
|
88
|
|
|
// FORWARD |
|
89
|
|
|
$filter = array_merge($filter, self::getForwardChain($p, $inetFamily, $disableForward)); |
|
90
|
|
|
|
|
91
|
|
|
$filter[] = 'COMMIT'; |
|
92
|
|
|
|
|
93
|
|
|
return $filter; |
|
94
|
|
|
} |
|
95
|
|
|
|
|
96
|
|
|
private static function getInputChain(Pools $p, $inetFamily) |
|
97
|
|
|
{ |
|
98
|
|
|
$inputChain = [ |
|
99
|
|
|
'-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT', |
|
100
|
|
|
sprintf('-A INPUT -p %s -j ACCEPT', 4 === $inetFamily ? 'icmp' : 'ipv6-icmp'), |
|
101
|
|
|
'-A INPUT -i lo -j ACCEPT', |
|
102
|
|
|
]; |
|
103
|
|
|
|
|
104
|
|
|
$inputPorts = self::getIngressPorts($p); |
|
105
|
|
|
foreach ($inputPorts as $inputPort) { |
|
106
|
|
|
list($proto, $port) = explode('/', $inputPort); |
|
107
|
|
|
$inputChain[] = sprintf('-A INPUT -m state --state NEW -m %s -p %s --dport %d -j ACCEPT', $proto, $proto, $port); |
|
108
|
|
|
} |
|
109
|
|
|
|
|
110
|
|
|
$inputChain[] = sprintf('-A INPUT -j REJECT --reject-with %s', 4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
|
111
|
|
|
|
|
112
|
|
|
return $inputChain; |
|
113
|
|
|
} |
|
114
|
|
|
|
|
115
|
|
|
private static function getForwardChain(Pools $p, $inetFamily, $disableForward) |
|
116
|
|
|
{ |
|
117
|
|
|
$forwardChain = [ |
|
118
|
|
|
'-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT', |
|
119
|
|
|
]; |
|
120
|
|
|
|
|
121
|
|
|
if (!$disableForward) { |
|
122
|
|
|
foreach ($p as $pool) { |
|
123
|
|
|
if (4 === $inetFamily) { |
|
124
|
|
|
// get the IPv4 range |
|
125
|
|
|
$srcNet = $pool->getRange()->getAddressPrefix(); |
|
126
|
|
|
} else { |
|
127
|
|
|
// get the IPv6 range |
|
128
|
|
|
$srcNet = $pool->getRange6()->getAddressPrefix(); |
|
129
|
|
|
} |
|
130
|
|
|
$forwardChain[] = sprintf('-N vpn-%s', $pool->getId()); |
|
131
|
|
|
$forwardChain[] = sprintf('-A FORWARD -i tun-%s+ -s %s -j vpn-%s', $pool->getId(), $srcNet, $pool->getId()); |
|
132
|
|
|
if ($pool->getClientToClient()) { |
|
133
|
|
|
// allow client-to-client |
|
134
|
|
|
$forwardChain[] = sprintf('-A vpn-%s -o tun-%s+ -d %s -j ACCEPT', $pool->getId(), $pool->getId(), $srcNet); |
|
135
|
|
|
} |
|
136
|
|
|
if ($pool->getDefaultGateway()) { |
|
137
|
|
|
// allow all traffic to the external interface |
|
138
|
|
|
|
|
139
|
|
|
// drop netbios |
|
140
|
|
|
// @see https://medium.com/@ValdikSS/deanonymizing-windows-users-and-capturing-microsoft-and-vpn-accounts-f7e53fe73834 |
|
141
|
|
|
foreach (['tcp', 'udp'] as $proto) { |
|
142
|
|
|
$forwardChain[] = sprintf( |
|
143
|
|
|
'-A vpn-%s -o %s -m multiport -p %s --dports 137:139,445 -j REJECT --reject-with %s', |
|
144
|
|
|
$pool->getId(), |
|
145
|
|
|
$pool->getExtIf(), |
|
146
|
|
|
$proto, |
|
147
|
|
|
4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
|
148
|
|
|
} |
|
149
|
|
|
|
|
150
|
|
|
$forwardChain[] = sprintf('-A vpn-%s -o %s -j ACCEPT', $pool->getId(), $pool->getExtIf(), $srcNet); |
|
151
|
|
|
} else { |
|
152
|
|
|
// only allow certain traffic to the external interface |
|
153
|
|
|
foreach ($pool->getRoutes() as $route) { |
|
154
|
|
|
if ($inetFamily === $route->getFamily()) { |
|
155
|
|
|
$forwardChain[] = sprintf('-A vpn-%s -o %s -d %s -j ACCEPT', $pool->getId(), $pool->getExtIf(), $route->getAddressPrefix()); |
|
156
|
|
|
} |
|
157
|
|
|
} |
|
158
|
|
|
} |
|
159
|
|
|
} |
|
160
|
|
|
} |
|
161
|
|
|
|
|
162
|
|
|
$forwardChain[] = sprintf('-A FORWARD -j REJECT --reject-with %s', 4 === $inetFamily ? 'icmp-host-prohibited' : 'icmp6-adm-prohibited'); |
|
163
|
|
|
|
|
164
|
|
|
return $forwardChain; |
|
165
|
|
|
} |
|
166
|
|
|
|
|
167
|
|
|
private static function getIngressPorts(Pools $p) |
|
168
|
|
|
{ |
|
169
|
|
|
$ingressPorts = ['tcp/22', 'tcp/80', 'tcp/443']; |
|
170
|
|
|
|
|
171
|
|
|
// we only care about additional UDP ports, as we only want UDP and |
|
172
|
|
|
// fallback to tcp/443 |
|
173
|
|
|
foreach ($p as $pool) { |
|
174
|
|
|
foreach ($pool->getInstances() as $instance) { |
|
175
|
|
|
if ('udp' === $instance->getProto()) { |
|
176
|
|
|
$port = sprintf('udp/%d', $instance->getPort()); |
|
177
|
|
|
if (!in_array($port, $ingressPorts)) { |
|
178
|
|
|
$ingressPorts[] = $port; |
|
179
|
|
|
} |
|
180
|
|
|
} |
|
181
|
|
|
} |
|
182
|
|
|
} |
|
183
|
|
|
|
|
184
|
|
|
return $ingressPorts; |
|
185
|
|
|
} |
|
186
|
|
|
} |
|
187
|
|
|
|
eduVPN /
vpn-server-api
