|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Schnittstabil\Csrf\TokenService; |
|
4
|
|
|
|
|
5
|
|
|
use Base64Url\Base64Url; |
|
6
|
|
|
|
|
7
|
|
|
/** |
|
8
|
|
|
* A TokenValidator. |
|
9
|
|
|
*/ |
|
10
|
|
|
class TokenValidator |
|
11
|
|
|
{ |
|
12
|
|
|
protected $sign; |
|
13
|
|
|
protected $base64url; |
|
14
|
|
|
|
|
15
|
|
|
/** |
|
16
|
|
|
* Create a new TokenValidator. |
|
17
|
|
|
* |
|
18
|
|
|
* @param callable $sign Callable used for generating the token signatures |
|
19
|
|
|
*/ |
|
20
|
|
|
public function __construct(callable $sign) |
|
21
|
|
|
{ |
|
22
|
|
|
$this->sign = $sign; |
|
23
|
|
|
$this->base64url = new Base64Url(); |
|
24
|
|
|
} |
|
25
|
|
|
|
|
26
|
|
|
/** |
|
27
|
|
|
* Determine constraint violations of a CSRF token. |
|
28
|
|
|
* |
|
29
|
|
|
* @param string $nonce Value used to associate a client session |
|
30
|
|
|
* @param string $token The token to validate |
|
31
|
|
|
* @param int $now The current time, defaults to `time()` |
|
32
|
|
|
* @param int $leeway The leeway in seconds |
|
33
|
|
|
* |
|
34
|
|
|
* @return InvalidArgumentException[] Constraint violations; if $token is valid, an empty array |
|
35
|
|
|
*/ |
|
36
|
|
|
public function __invoke($nonce, $token, $now = null, $leeway = 0) |
|
37
|
|
|
{ |
|
38
|
|
|
$parseResult = $this->parse($token); |
|
39
|
|
|
|
|
40
|
|
|
if ($violations = $parseResult->violations) { |
|
41
|
|
|
return $violations; |
|
42
|
|
|
} |
|
43
|
|
|
|
|
44
|
|
|
return $this->validatePayload($nonce, $parseResult->payload, $now, $leeway); |
|
45
|
|
|
} |
|
46
|
|
|
|
|
47
|
|
|
/** |
|
48
|
|
|
* Parse a CSRF token. |
|
49
|
|
|
* |
|
50
|
|
|
* @param string $token The token to parse |
|
51
|
|
|
* |
|
52
|
|
|
* @return \stdClass Parse result containing payload and constraint violations |
|
53
|
|
|
*/ |
|
54
|
|
|
protected function parse($token) |
|
55
|
|
|
{ |
|
56
|
|
|
$result = new \stdClass(); |
|
57
|
|
|
$result->violations = []; |
|
58
|
|
|
$result->payload = null; |
|
59
|
|
|
$segments = explode('.', $token); |
|
60
|
|
|
|
|
61
|
|
|
if (count($segments) !== 2) { |
|
62
|
|
|
$result->violations[] = new \InvalidArgumentException('Wrong number of segments'); |
|
63
|
|
|
|
|
64
|
|
|
return $result; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
list($payloadBase64, $signature) = $segments; |
|
68
|
|
|
|
|
69
|
|
|
$sign = $this->sign; |
|
70
|
|
|
|
|
71
|
|
|
if ($signature !== $sign($payloadBase64)) { |
|
72
|
|
|
$result->violations[] = new \InvalidArgumentException('Signature verification failed'); |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
|
|
$result->payload = json_decode($this->base64url->decode($payloadBase64)); |
|
76
|
|
|
|
|
77
|
|
|
if (!($result->payload instanceof \stdClass)) { |
|
78
|
|
|
$result->violations[] = new \InvalidArgumentException('Invalid payload encoding'); |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
return $result; |
|
82
|
|
|
} |
|
83
|
|
|
|
|
84
|
|
|
/** |
|
85
|
|
|
* Validate the payload of a CSRF token. |
|
86
|
|
|
* |
|
87
|
|
|
* @param string $nonce Value used to associate a client session |
|
88
|
|
|
* @param \stdClass $payload The token payload to validate |
|
89
|
|
|
* @param int $now The current time, defaults to `time()` |
|
90
|
|
|
* @param int $leeway The leeway in seconds |
|
91
|
|
|
* |
|
92
|
|
|
* @return InvalidArgumentException[] Constraint violations; if $payload is valid, an empty array |
|
93
|
|
|
*/ |
|
94
|
|
|
protected function validatePayload($nonce, \stdClass $payload, $now = null, $leeway = 0) |
|
95
|
|
|
{ |
|
96
|
|
|
$now = $now ?: time(); |
|
97
|
|
|
$violations = []; |
|
98
|
|
|
|
|
99
|
|
View Code Duplication |
if ($payload->exp + $leeway <= $now) { |
|
100
|
|
|
$exp = date(\DateTime::ISO8601, $payload->exp); |
|
101
|
|
|
$violations[] = new \InvalidArgumentException('Token already expired at '.$exp); |
|
102
|
|
|
} |
|
103
|
|
|
|
|
104
|
|
View Code Duplication |
if ($now + $leeway < $payload->iat) { |
|
105
|
|
|
$issuedAt = date(\DateTime::ISO8601, $payload->iat); |
|
106
|
|
|
$violations[] = new \InvalidArgumentException('Cannot handle token prior to '.$issuedAt); |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
if ($payload->nonce !== $nonce) { |
|
110
|
|
|
$violations[] = new \InvalidArgumentException('Nonce mismatch'); |
|
111
|
|
|
} |
|
112
|
|
|
|
|
113
|
|
|
return $violations; |
|
114
|
|
|
} |
|
115
|
|
|
} |
|
116
|
|
|
|
schnittstabil /
csrf-tokenservice
