|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
/* |
|
6
|
|
|
* The MIT License (MIT) |
|
7
|
|
|
* |
|
8
|
|
|
* Copyright (c) 2014-2018 Spomky-Labs |
|
9
|
|
|
* |
|
10
|
|
|
* This software may be modified and distributed under the terms |
|
11
|
|
|
* of the MIT license. See the LICENSE file for details. |
|
12
|
|
|
*/ |
|
13
|
|
|
|
|
14
|
|
|
namespace U2FAuthentication\Fido2\AttestationStatement; |
|
15
|
|
|
|
|
16
|
|
|
use U2FAuthentication\Fido2\AuthenticatorData; |
|
17
|
|
|
use U2FAuthentication\Fido2\CollectedClientData; |
|
18
|
|
|
|
|
19
|
|
|
final class FidoU2FAttestationStatementSupport implements AttestationStatementSupport |
|
20
|
|
|
{ |
|
21
|
|
|
private const CERTIFICATES_HASHES = [ |
|
22
|
|
|
'349bca1031f8c82c4ceca38b9cebf1a69df9fb3b94eed99eb3fb9aa3822d26e8', |
|
23
|
|
|
'dd574527df608e47ae45fbba75a2afdd5c20fd94a02419381813cd55a2a3398f', |
|
24
|
|
|
'1d8764f0f7cd1352df6150045c8f638e517270e8b5dda1c63ade9c2280240cae', |
|
25
|
|
|
'd0edc9a91a1677435a953390865d208c55b3183c6759c9b5a7ff494c322558eb', |
|
26
|
|
|
'6073c436dcd064a48127ddbf6032ac1a66fd59a0c24434f070d4e564c124c897', |
|
27
|
|
|
'ca993121846c464d666096d35f13bf44c1b05af205f9b4a1e00cf6cc10c5e511', |
|
28
|
|
|
]; |
|
29
|
|
|
|
|
30
|
|
|
/** |
|
31
|
|
|
* @var string[] |
|
32
|
|
|
*/ |
|
33
|
|
|
private $attestationCertificates = []; |
|
34
|
|
|
|
|
35
|
|
|
/** |
|
36
|
|
|
* @param string[] $attestationCertificates |
|
37
|
|
|
*/ |
|
38
|
|
|
public function __construct(array $attestationCertificates = []) |
|
39
|
|
|
{ |
|
40
|
|
|
$this->attestationCertificates = $attestationCertificates; |
|
41
|
|
|
} |
|
42
|
|
|
|
|
43
|
|
|
public function name(): string |
|
44
|
|
|
{ |
|
45
|
|
|
return 'fido-u2f'; |
|
46
|
|
|
} |
|
47
|
|
|
|
|
48
|
|
|
public function isValid(AttestationStatement $attestationStatement, AuthenticatorData $authenticatorData, CollectedClientData $collectedClientData): bool |
|
49
|
|
|
{ |
|
50
|
|
|
foreach (['sig', 'x5c'] as $key) { |
|
51
|
|
|
if (!$attestationStatement->has($key)) { |
|
52
|
|
|
throw new \InvalidArgumentException(sprintf('The attestation statement value "%s" is missing.', $key)); |
|
53
|
|
|
} |
|
54
|
|
|
} |
|
55
|
|
|
$x5c = $attestationStatement->get('x5c'); |
|
56
|
|
|
if (!\is_array($x5c) || empty($x5c)) { |
|
57
|
|
|
throw new \InvalidArgumentException('The attestation statement value "x5c" must be a list with at least one certificate.'); |
|
58
|
|
|
} |
|
59
|
|
|
|
|
60
|
|
|
reset($x5c); |
|
61
|
|
|
$x5c = $this->getPublicKeyAsPem(current($x5c)); |
|
62
|
|
|
|
|
63
|
|
|
if (!empty($this->attestationCertificates) && true !== openssl_x509_checkpurpose($x5c, X509_PURPOSE_ANY, $this->attestationCertificates)) { |
|
64
|
|
|
return false; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
$dataToVerify = "\0"; |
|
68
|
|
|
$dataToVerify .= $authenticatorData->getRpIdHash(); |
|
69
|
|
|
$dataToVerify .= hash('sha256', $collectedClientData->getRawData(), true); |
|
70
|
|
|
$dataToVerify .= $authenticatorData->getAttestedCredentialData()->getCredentialId(); |
|
71
|
|
|
$dataToVerify .= $this->extractPublicKey($authenticatorData->getAttestedCredentialData()->getCredentialPublicKey()); |
|
72
|
|
|
|
|
73
|
|
|
return 1 === openssl_verify($dataToVerify, $attestationStatement->get('sig'), $x5c, OPENSSL_ALGO_SHA256); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
private function getPublicKeyAsPem(string $publicKey): string |
|
77
|
|
|
{ |
|
78
|
|
|
$derCertificate = $this->unusedBytesFix($publicKey); |
|
79
|
|
|
$pemCert = '-----BEGIN CERTIFICATE-----'.PHP_EOL; |
|
80
|
|
|
$pemCert .= chunk_split(base64_encode($derCertificate), 64, PHP_EOL); |
|
81
|
|
|
$pemCert .= '-----END CERTIFICATE-----'.PHP_EOL; |
|
82
|
|
|
|
|
83
|
|
|
return $pemCert; |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
|
|
private function extractPublicKey(?array $publicKey): string |
|
87
|
|
|
{ |
|
88
|
|
|
if (!\is_array($publicKey) || !array_key_exists(-2, $publicKey) || !\is_string($publicKey[-2]) || 32 !== mb_strlen($publicKey[-2], '8bit')) { |
|
89
|
|
|
throw new \InvalidArgumentException('The public key of the attestation statement is not valid.'); |
|
90
|
|
|
} |
|
91
|
|
|
if (!array_key_exists(-3, $publicKey) || !\is_string($publicKey[-3]) || 32 !== mb_strlen($publicKey[-3], '8bit')) { |
|
92
|
|
|
throw new \InvalidArgumentException('The public key of the attestation statement is not valid.'); |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
|
|
return "\x04".$publicKey[-2].$publicKey[-3]; |
|
96
|
|
|
} |
|
97
|
|
|
|
|
98
|
|
|
private function unusedBytesFix(string $derCertificate): string |
|
99
|
|
|
{ |
|
100
|
|
|
$certificateHash = hash('sha256', $derCertificate); |
|
101
|
|
|
if (\in_array($certificateHash, self::CERTIFICATES_HASHES, true)) { |
|
102
|
|
|
$derCertificate[mb_strlen($derCertificate, '8bit') - 257] = "\0"; |
|
103
|
|
|
} |
|
104
|
|
|
|
|
105
|
|
|
return $derCertificate; |
|
106
|
|
|
} |
|
107
|
|
|
} |
|
108
|
|
|
|
Spomky-Labs /
u2f-php
