|
1
|
|
|
<?php |
|
2
|
|
|
declare(strict_types = 1); |
|
3
|
|
|
|
|
4
|
|
|
namespace Zakirullin\Middlewares; |
|
5
|
|
|
|
|
6
|
|
|
use Psr\Http\Server\MiddlewareInterface; |
|
7
|
|
|
use Psr\Http\Server\RequestHandlerInterface; |
|
8
|
|
|
use Psr\Http\Message\ServerRequestInterface; |
|
9
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
10
|
|
|
use Middlewares\Utils\Factory; |
|
11
|
|
|
|
|
12
|
|
|
class CSRF implements MiddlewareInterface |
|
13
|
|
|
{ |
|
14
|
|
|
/** |
|
15
|
|
|
* @var callable |
|
16
|
|
|
*/ |
|
17
|
|
|
protected $shouldProtectCallback; |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* @var callable |
|
21
|
|
|
*/ |
|
22
|
|
|
protected $getIdentityCallback; |
|
23
|
|
|
|
|
24
|
|
|
/** |
|
25
|
|
|
* @var string |
|
26
|
|
|
*/ |
|
27
|
|
|
protected $secret; |
|
28
|
|
|
|
|
29
|
|
|
/** |
|
30
|
|
|
* @var string |
|
31
|
|
|
*/ |
|
32
|
|
|
protected $attribute; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* @var int |
|
36
|
|
|
*/ |
|
37
|
|
|
protected $ttl; |
|
38
|
|
|
|
|
39
|
|
|
/** |
|
40
|
|
|
* @var string |
|
41
|
|
|
*/ |
|
42
|
|
|
protected $algorithm; |
|
43
|
|
|
|
|
44
|
|
|
protected const METHODS = ['POST']; |
|
45
|
|
|
protected const STATUS_ON_ERROR = 403; |
|
46
|
|
|
protected const CERTIFICATE_SEPARATOR = ':'; |
|
47
|
|
|
protected const ATTRIBUTE = 'csrf'; |
|
48
|
|
|
protected const TTL = 60 * 20; |
|
49
|
|
|
protected const ALGORITHM = 'ripemd160'; |
|
50
|
|
|
|
|
51
|
|
|
/** |
|
52
|
|
|
* @param callable $shouldProtect |
|
53
|
|
|
* @param callable $getIdentity |
|
54
|
|
|
* @param string $secret |
|
55
|
|
|
* @param string $attribute |
|
56
|
|
|
* @param int $ttl |
|
57
|
|
|
* @param string $algorithm |
|
58
|
|
|
*/ |
|
59
|
|
|
public function __construct( |
|
60
|
|
|
callable $shouldProtect, |
|
61
|
|
|
callable $getIdentity, |
|
62
|
|
|
string $secret, |
|
63
|
|
|
string $attribute = self::ATTRIBUTE, |
|
64
|
|
|
int $ttl = self::TTL, |
|
65
|
|
|
string $algorithm = self::ALGORITHM |
|
66
|
|
|
) { |
|
67
|
|
|
$this->shouldProtectCallback = $shouldProtect; |
|
68
|
|
|
$this->getIdentityCallback = $getIdentity; |
|
69
|
|
|
$this->secret = $secret; |
|
70
|
|
|
$this->attribute = $attribute; |
|
71
|
|
|
$this->ttl = $ttl; |
|
72
|
|
|
$this->algorithm = $algorithm; |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
|
|
/** |
|
76
|
|
|
* @param ServerRequestInterface $request |
|
77
|
|
|
* @param RequestHandlerInterface $handler |
|
78
|
|
|
* @return ResponseInterface |
|
79
|
|
|
*/ |
|
80
|
|
|
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
|
81
|
|
|
{ |
|
82
|
|
|
$shouldProtect = call_user_func($this->shouldProtectCallback, $request); |
|
83
|
|
|
if ($shouldProtect) { |
|
84
|
|
|
$shouldProtectMethod = in_array($request->getMethod(), static::METHODS); |
|
85
|
|
|
if ($shouldProtectMethod) { |
|
86
|
|
|
if (!$this->verify($request)) { |
|
87
|
|
|
$response = Factory::createResponse(static::STATUS_ON_ERROR); |
|
88
|
|
|
$response->getBody()->write('Invalid or missing CSRF token!'); |
|
89
|
|
|
|
|
90
|
|
|
return $response; |
|
91
|
|
|
} |
|
92
|
|
|
} |
|
93
|
|
|
|
|
94
|
|
|
$request = $this->add($request); |
|
95
|
|
|
} |
|
96
|
|
|
|
|
97
|
|
|
return $handler->handle($request); |
|
98
|
|
|
} |
|
99
|
|
|
|
|
100
|
|
|
/** |
|
101
|
|
|
* @param ServerRequestInterface $request |
|
102
|
|
|
* @return ServerRequestInterface $request |
|
103
|
|
|
*/ |
|
104
|
|
|
protected function add(ServerRequestInterface $request): ServerRequestInterface |
|
105
|
|
|
{ |
|
106
|
|
|
$identity = $this->getIdentity($request); |
|
107
|
|
|
if (!empty($identity)) { |
|
108
|
|
|
$expireAt = time() + $this->ttl; |
|
109
|
|
|
$certificate = $this->createCertificate($identity, $expireAt); |
|
110
|
|
|
$signature = hash_hmac($this->algorithm, $certificate, $this->secret); |
|
111
|
|
|
$signatureWithExpiration = implode(static::CERTIFICATE_SEPARATOR, [$expireAt, $signature]); |
|
112
|
|
|
|
|
113
|
|
|
$request = $request->withAttribute($this->attribute, $signatureWithExpiration); |
|
114
|
|
|
} |
|
115
|
|
|
|
|
116
|
|
|
return $request; |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
|
|
/** |
|
120
|
|
|
* @param ServerRequestInterface $request |
|
121
|
|
|
* @return bool |
|
122
|
|
|
*/ |
|
123
|
|
|
protected function verify(ServerRequestInterface $request): bool |
|
124
|
|
|
{ |
|
125
|
|
|
$token = trim($request->getParsedBody()[$this->attribute] ?? ''); |
|
126
|
|
|
$parts = explode(static::CERTIFICATE_SEPARATOR, $token); |
|
127
|
|
|
if (count($parts) > 1) { |
|
128
|
|
|
list($expireAt, $signature) = explode(static::CERTIFICATE_SEPARATOR, $token); |
|
129
|
|
|
$identity = $this->getIdentity($request); |
|
130
|
|
|
$certificate = $this->createCertificate($identity, (int)$expireAt); |
|
131
|
|
|
|
|
132
|
|
|
$actualSignature = hash_hmac($this->algorithm, $certificate, $this->secret); |
|
133
|
|
|
$isSignatureValid = hash_equals($actualSignature, $signature); |
|
134
|
|
|
$isNotExpired = $expireAt > time(); |
|
135
|
|
|
if ($isSignatureValid && $isNotExpired) { |
|
136
|
|
|
return true; |
|
137
|
|
|
} |
|
138
|
|
|
} |
|
139
|
|
|
|
|
140
|
|
|
return false; |
|
141
|
|
|
} |
|
142
|
|
|
|
|
143
|
|
|
/** |
|
144
|
|
|
* @param array $identity |
|
145
|
|
|
* @param int $expireAt |
|
146
|
|
|
* @return string |
|
147
|
|
|
*/ |
|
148
|
|
|
protected function createCertificate(array $identity, int $expireAt): string |
|
149
|
|
|
{ |
|
150
|
|
|
$identity[] = $expireAt; |
|
151
|
|
|
|
|
152
|
|
|
return implode(static::CERTIFICATE_SEPARATOR, $identity); |
|
153
|
|
|
} |
|
154
|
|
|
|
|
155
|
|
|
/** |
|
156
|
|
|
* @param ServerRequestInterface $request |
|
157
|
|
|
* @return array |
|
158
|
|
|
*/ |
|
159
|
|
|
protected function getIdentity(ServerRequestInterface $request) |
|
160
|
|
|
{ |
|
161
|
|
|
$identity = call_user_func($this->getIdentityCallback, $request); |
|
162
|
|
|
if (!is_array($identity)) { |
|
163
|
|
|
$identity = [$identity]; |
|
164
|
|
|
} |
|
165
|
|
|
|
|
166
|
|
|
return $identity; |
|
167
|
|
|
} |
|
168
|
|
|
} |
zakirullin /
csrf-middleware
