1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
<?php
/**
* SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\WorkflowEngine\Check;
use OCP\IL10N;
use OCP\IRequest;
use OCP\WorkflowEngine\ICheck;
class RequestRemoteAddress implements ICheck {
/** @var IL10N */
protected $l;
/** @var IRequest */
protected $request;
/**
* @param IL10N $l
* @param IRequest $request
*/
public function __construct(IL10N $l, IRequest $request) {
$this->l = $l;
$this->request = $request;
}
/**
* @param string $operator
* @param string $value
* @return bool
*/
public function executeCheck($operator, $value) {
$actualValue = $this->request->getRemoteAddress();
$decodedValue = explode('/', $value);
if ($operator === 'matchesIPv4') {
return $this->matchIPv4($actualValue, $decodedValue[0], $decodedValue[1]);
} elseif ($operator === '!matchesIPv4') {
return !$this->matchIPv4($actualValue, $decodedValue[0], $decodedValue[1]);
} elseif ($operator === 'matchesIPv6') {
return $this->matchIPv6($actualValue, $decodedValue[0], $decodedValue[1]);
} else {
return !$this->matchIPv6($actualValue, $decodedValue[0], $decodedValue[1]);
}
}
/**
* @param string $operator
* @param string $value
* @throws \UnexpectedValueException
*/
public function validateCheck($operator, $value) {
if (!in_array($operator, ['matchesIPv4', '!matchesIPv4', 'matchesIPv6', '!matchesIPv6'])) {
throw new \UnexpectedValueException($this->l->t('The given operator is invalid'), 1);
}
$decodedValue = explode('/', $value);
if (count($decodedValue) !== 2) {
throw new \UnexpectedValueException($this->l->t('The given IP range is invalid'), 2);
}
if (in_array($operator, ['matchesIPv4', '!matchesIPv4'])) {
if (!filter_var($decodedValue[0], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
throw new \UnexpectedValueException($this->l->t('The given IP range is not valid for IPv4'), 3);
}
if ($decodedValue[1] > 32 || $decodedValue[1] <= 0) {
throw new \UnexpectedValueException($this->l->t('The given IP range is not valid for IPv4'), 4);
}
} else {
if (!filter_var($decodedValue[0], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
throw new \UnexpectedValueException($this->l->t('The given IP range is not valid for IPv6'), 3);
}
if ($decodedValue[1] > 128 || $decodedValue[1] <= 0) {
throw new \UnexpectedValueException($this->l->t('The given IP range is not valid for IPv6'), 4);
}
}
}
/**
* Based on https://stackoverflow.com/a/594134
* @param string $ip
* @param string $rangeIp
* @param int $bits
* @return bool
*/
protected function matchIPv4($ip, $rangeIp, $bits) {
$rangeDecimal = ip2long($rangeIp);
$ipDecimal = ip2long($ip);
$mask = -1 << (32 - $bits);
return ($ipDecimal & $mask) === ($rangeDecimal & $mask);
}
/**
* Based on https://stackoverflow.com/a/7951507
* @param string $ip
* @param string $rangeIp
* @param int $bits
* @return bool
*/
protected function matchIPv6($ip, $rangeIp, $bits) {
$ipNet = inet_pton($ip);
$binaryIp = $this->ipv6ToBits($ipNet);
$ipNetBits = substr($binaryIp, 0, $bits);
$rangeNet = inet_pton($rangeIp);
$binaryRange = $this->ipv6ToBits($rangeNet);
$rangeNetBits = substr($binaryRange, 0, $bits);
return $ipNetBits === $rangeNetBits;
}
/**
* Based on https://stackoverflow.com/a/7951507
* @param string $packedIp
* @return string
*/
protected function ipv6ToBits($packedIp) {
$unpackedIp = unpack('A16', $packedIp);
$unpackedIp = str_split($unpackedIp[1]);
$binaryIp = '';
foreach ($unpackedIp as $char) {
$binaryIp .= str_pad(decbin(ord($char)), 8, '0', STR_PAD_LEFT);
}
return str_pad($binaryIp, 128, '0', STR_PAD_RIGHT);
}
/**
* returns a list of Entities the checker supports. The values must match
* the class name of the entity.
*
* An empty result means the check is universally available.
*
* @since 18.0.0
*/
public function supportedEntities(): array {
return [];
}
/**
* returns whether the operation can be used in the requested scope.
*
* Scope IDs are defined as constants in OCP\WorkflowEngine\IManager. At
* time of writing these are SCOPE_ADMIN and SCOPE_USER.
*
* For possibly unknown future scopes the recommended behaviour is: if
* user scope is permitted, the default behaviour should return `true`,
* otherwise `false`.
*
* @since 18.0.0
*/
public function isAvailableForScope(int $scope): bool {
return true;
}
}
|
