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
157
158
159
160
161
|
<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2023 Joas Schilling <coding@schilljs.com>
*
* @author Joas Schilling <coding@schilljs.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Security\Bruteforce\Backend;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\ICache;
use OCP\ICacheFactory;
class MemoryCacheBackend implements IBackend {
private ICache $cache;
public function __construct(
ICacheFactory $cacheFactory,
private ITimeFactory $timeFactory,
) {
$this->cache = $cacheFactory->createDistributed(__CLASS__);
}
private function hash(
null|string|array $data,
): ?string {
if ($data === null) {
return null;
}
if (!is_string($data)) {
$data = json_encode($data);
}
return hash('sha1', $data);
}
private function getExistingAttempts(string $identifier): array {
$cachedAttempts = $this->cache->get($identifier);
if ($cachedAttempts === null) {
return [];
}
$cachedAttempts = json_decode($cachedAttempts, true);
if (\is_array($cachedAttempts)) {
return $cachedAttempts;
}
return [];
}
/**
* {@inheritDoc}
*/
public function getAttempts(
string $ipSubnet,
int $maxAgeTimestamp,
?string $action = null,
?array $metadata = null,
): int {
$identifier = $this->hash($ipSubnet);
$actionHash = $this->hash($action);
$metadataHash = $this->hash($metadata);
$existingAttempts = $this->getExistingAttempts($identifier);
$count = 0;
foreach ($existingAttempts as $info) {
[$occurredTime, $attemptAction, $attemptMetadata] = explode('#', $info, 3);
if ($action === null || $attemptAction === $actionHash) {
if ($metadata === null || $attemptMetadata === $metadataHash) {
if ($occurredTime > $maxAgeTimestamp) {
$count++;
}
}
}
}
return $count;
}
/**
* {@inheritDoc}
*/
public function resetAttempts(
string $ipSubnet,
?string $action = null,
?array $metadata = null,
): void {
$identifier = $this->hash($ipSubnet);
if ($action === null) {
$this->cache->remove($identifier);
} else {
$actionHash = $this->hash($action);
$metadataHash = $this->hash($metadata);
$existingAttempts = $this->getExistingAttempts($identifier);
$maxAgeTimestamp = $this->timeFactory->getTime() - 12 * 3600;
foreach ($existingAttempts as $key => $info) {
[$occurredTime, $attemptAction, $attemptMetadata] = explode('#', $info, 3);
if ($attemptAction === $actionHash) {
if ($metadata === null || $attemptMetadata === $metadataHash) {
unset($existingAttempts[$key]);
} elseif ($occurredTime < $maxAgeTimestamp) {
unset($existingAttempts[$key]);
}
}
}
if (!empty($existingAttempts)) {
$this->cache->set($identifier, json_encode($existingAttempts), 12 * 3600);
} else {
$this->cache->remove($identifier);
}
}
}
/**
* {@inheritDoc}
*/
public function registerAttempt(
string $ip,
string $ipSubnet,
int $timestamp,
string $action,
array $metadata = [],
): void {
$identifier = $this->hash($ipSubnet);
$existingAttempts = $this->getExistingAttempts($identifier);
$maxAgeTimestamp = $this->timeFactory->getTime() - 12 * 3600;
// Unset all attempts that are already expired
foreach ($existingAttempts as $key => $info) {
[$occurredTime,] = explode('#', $info, 3);
if ($occurredTime < $maxAgeTimestamp) {
unset($existingAttempts[$key]);
}
}
$existingAttempts = array_values($existingAttempts);
// Store the new attempt
$existingAttempts[] = $timestamp . '#' . $this->hash($action) . '#' . $this->hash($metadata);
$this->cache->set($identifier, json_encode($existingAttempts), 12 * 3600);
}
}
|
