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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| <?php | ||
| declare(strict_types=1); | ||
|
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| namespace Firehed\U2F\WebAuthn; | ||
|
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| use BadMethodCallException; | ||
| use Firehed\CBOR\Decoder; | ||
|
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| /** | ||
| * @phpstan-type AttestedCredentialData array{ | ||
| * aaguid: string, | ||
| * credentialId: string, | ||
| * credentialPublicKey: array{ | ||
| * 1: int, | ||
| * 3?: int, | ||
| * -1: int, | ||
| * -2?: string, | ||
| * -3?: string, | ||
| * -4?: string, | ||
| * } | ||
| * } | ||
| */ | ||
| class AuthenticatorData | ||
| { | ||
| /** @var bool */ | ||
| private $isUserPresent; | ||
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| /** @var bool */ | ||
| private $isUserVerified; | ||
|
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| /** @var string (binary) */ | ||
| private $rpIdHash; | ||
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| /** @var int */ | ||
| private $signCount; | ||
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| /** | ||
| * @var ?AttestedCredentialData Attested Credential Data | ||
| */ | ||
| private $ACD; | ||
|
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| /** @var null RESERVED: WebAuthn Extensions */ | ||
| private $extensions; | ||
|
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| /** | ||
| * @see https://w3c.github.io/webauthn/#sec-authenticator-data | ||
| * WebAuthn 6.1 | ||
| */ | ||
| public static function parse(string $bytes): AuthenticatorData | ||
| { | ||
| assert(strlen($bytes) >= 37); | ||
|
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| $rpIdHash = substr($bytes, 0, 32); | ||
| $flags = ord(substr($bytes, 32, 1)); | ||
| $UP = ($flags & 0x01) === 0x01; // bit 0 | ||
| $UV = ($flags & 0x04) === 0x04; // bit 2 | ||
| $AT = ($flags & 0x40) === 0x40; // bit 6 | ||
| $ED = ($flags & 0x80) === 0x80; // bit 7 | ||
| $signCount = unpack('N', substr($bytes, 33, 4))[1]; | ||
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| $authData = new AuthenticatorData(); | ||
| $authData->isUserPresent = $UP; | ||
| $authData->isUserVerified = $UV; | ||
| $authData->rpIdHash = $rpIdHash; | ||
| $authData->signCount = $signCount; | ||
|
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| $restOfBytes = substr($bytes, 37); | ||
| $restOfBytesLength = strlen($restOfBytes); | ||
| if ($AT) { | ||
| assert($restOfBytesLength >= 18); | ||
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| $aaguid = substr($restOfBytes, 0, 16); | ||
| $credentialIdLength = unpack('n', substr($restOfBytes, 16, 2))[1]; | ||
| assert($restOfBytesLength >= (18 + $credentialIdLength)); | ||
| $credentialId = substr($restOfBytes, 18, $credentialIdLength); | ||
|
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| $rawCredentialPublicKey = substr($restOfBytes, 18 + $credentialIdLength); | ||
|
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| $decoder = new Decoder(); | ||
| $credentialPublicKey = $decoder->decode($rawCredentialPublicKey); | ||
|
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| $authData->ACD = [ | ||
| 'aaguid' => $aaguid, | ||
| 'credentialId' => $credentialId, | ||
| 'credentialPublicKey' => $credentialPublicKey, | ||
| ]; | ||
| // var_dump($decoder->getNumberOfBytesRead()); | ||
| // cut rest of bytes down based on that ^ ? | ||
| } | ||
| if ($ED) { | ||
| // @codeCoverageIgnoreStart | ||
| throw new BadMethodCallException('Not implemented yet'); | ||
| // @codeCoverageIgnoreEnd | ||
| } | ||
|
|
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| return $authData; | ||
| } | ||
|
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| /** @return ?AttestedCredentialData */ | ||
| public function getAttestedCredentialData(): ?array | ||
| { | ||
| return $this->ACD; | ||
| } | ||
|
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| public function getRpIdHash(): string | ||
| { | ||
| return $this->rpIdHash; | ||
| } | ||
|
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| public function getSignCount(): int | ||
| { | ||
| return $this->signCount; | ||
| } | ||
|
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| public function isUserPresent(): bool | ||
| { | ||
| return $this->isUserPresent; | ||
| } | ||
|
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| /** | ||
| * @return array{ | ||
| * isUserPresent: bool, | ||
| * isUserVerified: bool, | ||
| * rpIdHash: string, | ||
| * signCount: int, | ||
| * ACD?: array{ | ||
| * aaguid: string, | ||
| * credentialId: string, | ||
| * credentialPublicKey: array{ | ||
| * kty: int, | ||
| * alg: ?int, | ||
| * crv: int, | ||
| * x: string, | ||
| * y: string, | ||
| * d: string, | ||
| * }, | ||
| * }, | ||
| * } | ||
| */ | ||
| public function __debugInfo(): array | ||
| { | ||
| $hex = function ($str) { | ||
| return '0x' . bin2hex($str); | ||
| }; | ||
| $data = [ | ||
| 'isUserPresent' => $this->isUserPresent, | ||
| 'isUserVerified' => $this->isUserVerified, | ||
| 'rpIdHash' => $hex($this->rpIdHash), | ||
| 'signCount' => $this->signCount, | ||
| ]; | ||
|
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| if ($this->ACD) { | ||
| // See RFC8152 section 7 (COSE key parameters) | ||
| $pk = [ | ||
| 'kty' => $this->ACD['credentialPublicKey'][1], // MUST be 'EC2' (sec 13 tbl 21) | ||
| // kid = 2 | ||
| 'alg' => $this->ACD['credentialPublicKey'][3] ?? null, | ||
| // key_ops = 4 // must include sign (1)/verify(2) if present, depending on usage | ||
| // Base IV = 5 | ||
|
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| // this would be 'k' if 'kty'===4(Symmetric) | ||
| 'crv' => $this->ACD['credentialPublicKey'][-1], // (13.1 tbl 22) | ||
| 'x' => $hex($this->ACD['credentialPublicKey'][-2] ?? ''), // (13.1.1 tbl 23/13.2 tbl 24) | ||
| 'y' => $hex($this->ACD['credentialPublicKey'][-3] ?? ''), // (13.1.1 tbl 23) | ||
| 'd' => $hex($this->ACD['credentialPublicKey'][-4] ?? ''), // (13.2 tbl 24) | ||
|
|
||
| ]; | ||
| $acd = [ | ||
| 'aaguid' => $hex($this->ACD['aaguid']), | ||
| 'credentialId' => $hex($this->ACD['credentialId']), | ||
| 'credentialPublicKey' => $pk, | ||
| ]; | ||
| $data['ACD'] = $acd; | ||
| } | ||
| return $data; | ||
| } | ||
| } |
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