|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace Ecodev\Felix\Middleware; |
|
6
|
|
|
|
|
7
|
|
|
use Cake\Chronos\Chronos; |
|
8
|
|
|
use Ecodev\Felix\Validator\IPRange; |
|
9
|
|
|
use Exception; |
|
10
|
|
|
use Psr\Http\Message\ResponseInterface; |
|
11
|
|
|
use Psr\Http\Message\ServerRequestInterface; |
|
12
|
|
|
use Psr\Http\Server\MiddlewareInterface; |
|
13
|
|
|
use Psr\Http\Server\RequestHandlerInterface; |
|
14
|
|
|
|
|
15
|
|
|
/** |
|
16
|
|
|
* Validate that the GraphQL query contains a valid signature in the `X-Signature` HTTP header. |
|
17
|
|
|
* |
|
18
|
|
|
* The signature payload is the GraphQL operation (or operations in case of batching). That means that the query itself |
|
19
|
|
|
* and the variables are signed. But it specifically does **not** include uploaded files. |
|
20
|
|
|
* |
|
21
|
|
|
* The signature is valid for a limited time only, ~15 minutes. |
|
22
|
|
|
* |
|
23
|
|
|
* The signature syntax is: |
|
24
|
|
|
* |
|
25
|
|
|
* ```ebnf |
|
26
|
|
|
* signature = "v1", ".", timestamp, ".", hash |
|
27
|
|
|
* timestamp = current unix time |
|
28
|
|
|
* hash = HMAC_SHA256( payload ) |
|
29
|
|
|
* payload = timestamp, graphql operations |
|
30
|
|
|
* ``` |
|
31
|
|
|
*/ |
|
32
|
|
|
final class SignedQueryMiddleware implements MiddlewareInterface |
|
33
|
|
|
{ |
|
34
|
31 |
|
public function __construct( |
|
35
|
|
|
private readonly array $keys, |
|
36
|
|
|
private readonly array $allowedIps, |
|
37
|
|
|
private readonly bool $required = true |
|
38
|
|
|
) { |
|
39
|
31 |
|
if ($this->required && !$this->keys) { |
|
40
|
1 |
|
throw new Exception('Signed queries are required, but no keys are configured'); |
|
41
|
|
|
} |
|
42
|
|
|
} |
|
43
|
|
|
|
|
44
|
30 |
|
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
|
45
|
|
|
{ |
|
46
|
30 |
|
if ($this->required) { |
|
47
|
15 |
|
$this->verify($request); |
|
48
|
|
|
} |
|
49
|
|
|
|
|
50
|
23 |
|
return $handler->handle($request); |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
15 |
|
private function verify(ServerRequestInterface $request): void |
|
54
|
|
|
{ |
|
55
|
15 |
|
$signature = $request->getHeader('X-Signature')[0] ?? ''; |
|
56
|
15 |
|
if (!$signature) { |
|
57
|
2 |
|
if ($this->isAllowedIp($request)) { |
|
58
|
1 |
|
return; |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
1 |
|
throw new Exception('Missing `X-Signature` HTTP header in signed query', 403); |
|
62
|
|
|
} |
|
63
|
|
|
|
|
64
|
13 |
|
if (preg_match('~^v1\.(?<timestamp>\d{10})\.(?<hash>[0-9a-f]{64})$~', $signature, $m)) { |
|
65
|
12 |
|
$timestamp = $m['timestamp']; |
|
66
|
12 |
|
$hash = $m['hash']; |
|
67
|
|
|
|
|
68
|
12 |
|
$this->verifyTimestamp($timestamp); |
|
69
|
10 |
|
$this->verifyHash($request, $timestamp, $hash); |
|
70
|
|
|
} else { |
|
71
|
1 |
|
throw new Exception('Invalid `X-Signature` HTTP header in signed query', 403); |
|
72
|
|
|
} |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
12 |
|
private function verifyTimestamp(string $timestamp): void |
|
76
|
|
|
{ |
|
77
|
12 |
|
$now = Chronos::now()->timestamp; |
|
78
|
12 |
|
$leeway = 15 * 900; // 15 minutes |
|
79
|
12 |
|
$past = $now - $leeway; |
|
80
|
12 |
|
$future = $now + $leeway; |
|
81
|
12 |
|
if ($timestamp < $past || $timestamp > $future) { |
|
82
|
2 |
|
throw new Exception('Signed query is expired', 403); |
|
83
|
|
|
} |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
10 |
|
private function verifyHash(ServerRequestInterface $request, string $timestamp, string $hash): void |
|
87
|
|
|
{ |
|
88
|
10 |
|
$operations = $this->getOperations($request); |
|
89
|
9 |
|
$payload = $timestamp . $operations; |
|
90
|
|
|
|
|
91
|
9 |
|
foreach ($this->keys as $key) { |
|
92
|
9 |
|
$computedHash = hash_hmac('sha256', $payload, $key); |
|
93
|
9 |
|
if ($hash === $computedHash) { |
|
94
|
7 |
|
return; |
|
95
|
|
|
} |
|
96
|
|
|
} |
|
97
|
|
|
|
|
98
|
2 |
|
throw new Exception('Invalid signed query', 403); |
|
99
|
|
|
} |
|
100
|
|
|
|
|
101
|
10 |
|
private function getOperations(ServerRequestInterface $request): mixed |
|
102
|
|
|
{ |
|
103
|
10 |
|
$contents = $request->getBody()->getContents(); |
|
104
|
10 |
|
if ($contents) { |
|
105
|
7 |
|
return $contents; |
|
106
|
|
|
} |
|
107
|
|
|
|
|
108
|
3 |
|
$parsedBody = $request->getParsedBody(); |
|
109
|
3 |
|
if (is_array($parsedBody)) { |
|
110
|
2 |
|
$operations = $parsedBody['operations'] ?? null; |
|
111
|
2 |
|
if ($operations) { |
|
112
|
2 |
|
return $operations; |
|
113
|
|
|
} |
|
114
|
|
|
} |
|
115
|
|
|
|
|
116
|
1 |
|
throw new Exception('Could not find GraphQL operations in request', 403); |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
2 |
|
private function isAllowedIp(ServerRequestInterface $request): bool |
|
120
|
|
|
{ |
|
121
|
2 |
|
$remoteAddress = $request->getServerParams()['REMOTE_ADDR'] ?? ''; |
|
122
|
|
|
|
|
123
|
2 |
|
if (!$remoteAddress || !is_string($remoteAddress)) { |
|
124
|
1 |
|
return false; |
|
125
|
|
|
} |
|
126
|
|
|
|
|
127
|
1 |
|
return IPRange::matches($remoteAddress, $this->allowedIps); |
|
128
|
|
|
} |
|
129
|
|
|
} |
|
130
|
|
|
|
Ecodev /
felix
