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
|
<?php
declare(strict_types=1);
/**
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
*
* Nextcloud - Two-factor Gateway
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\TwoFactorGateway\Provider;
use OCA\TwoFactorGateway\PhoneNumberMask;
use OCA\TwoFactorGateway\Service\Gateway\IGateway;
use OCA\TwoFactorGateway\Service\StateStorage;
use OCP\Authentication\TwoFactorAuth\IProvider;
use OCP\IL10N;
use OCP\ISession;
use OCP\IUser;
use OCP\Security\ISecureRandom;
use OCP\Template;
abstract class AProvider implements IProvider {
const STATE_DISABLED = 0;
const STATE_START_VERIFICATION = 1;
const STATE_VERIFYING = 2;
const STATE_ENABLED = 3;
/** @var string */
protected $gatewayName;
/** @var IGateway */
protected $gateway;
/** @var StateStorage */
protected $stateStorage;
/** @var ISession */
protected $session;
/** @var ISecureRandom */
protected $secureRandom;
/** @var IL10N */
protected $l10n;
private function getSessionKey() {
return "twofactor_gateway_$this->gatewayId_secret";
}
public function __construct(string $gatewayId,
IGateway $gateway,
StateStorage $stateStorage,
ISession $session,
ISecureRandom $secureRandom,
IL10N $l10n) {
$this->gateway = $gateway;
$this->gatewayName = $gatewayId;
$this->stateStorage = $stateStorage;
$this->session = $session;
$this->secureRandom = $secureRandom;
$this->l10n = $l10n;
}
/**
* Get unique identifier of this 2FA provider
*/
public function getId(): string {
return "gateway_$this->gatewayName";
}
private function getSecret(): string {
if ($this->session->exists($this->getSessionKey())) {
return $this->session->get($this->getSessionKey());
}
$secret = $this->secureRandom->generate(6, ISecureRandom::CHAR_DIGITS);
$this->session->set($this->getSessionKey(), $secret);
return $secret;
}
/**
* Get the template for rending the 2FA provider view
*/
public function getTemplate(IUser $user): Template {
$secret = $this->getSecret();
try {
$identifier = $this->stateStorage->get($user, $this->gatewayName)->getIdentifier();
$this->gateway->send(
$user,
$identifier,
$this->l10n->t('%s is your Nextcloud authentication code', [
$secret
])
);
} catch (SmsTransmissionException $ex) {
return new Template('twofactor_gateway', 'error');
}
$tmpl = new Template('twofactor_gateway', 'challenge');
$tmpl->assign('phone', PhoneNumberMask::maskNumber($identifier));
return $tmpl;
}
/**
* Verify the given challenge
*/
public function verifyChallenge(IUser $user, string $challenge): bool {
$valid = $this->session->exists($this->getSessionKey())
&& $this->session->get($this->getSessionKey()) === $challenge;
if ($valid) {
$this->session->remove($this->getSessionKey());
}
return $valid;
}
/**
* Decides whether 2FA is enabled for the given user
*/
public function isTwoFactorAuthEnabledForUser(IUser $user): bool {
return $this->stateStorage->get($user, $this->gatewayName)->getState() === self::STATE_ENABLED;
}
}
|
