120 lines
3.4 KiB
PHP
120 lines
3.4 KiB
PHP
<?php
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namespace Core\Objects\TwoFactor;
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use Core\Driver\SQL\SQL;
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use Core\Objects\DatabaseEntity\Attribute\Transient;
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use Cose\Algorithm\Signature\ECDSA\ECSignature;
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use Core\Objects\DatabaseEntity\TwoFactorToken;
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use Cose\Key\Key;
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class KeyBasedTwoFactorToken extends TwoFactorToken {
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const TYPE = "fido";
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#[Transient]
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private ?string $challenge;
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#[Transient]
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private ?string $credentialID;
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#[Transient]
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private ?PublicKey $publicKey;
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private function __construct() {
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parent::__construct(self::TYPE);
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}
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public function generateChallenge(int $length = 32) {
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$this->challenge = base64_encode(generateRandomString($length, "raw"));
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$_SESSION["challenge"] = $this->challenge;
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}
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public static function create(int $challengeLength = 32): KeyBasedTwoFactorToken {
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$token = new KeyBasedTwoFactorToken();
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$token->generateChallenge($challengeLength);
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return $token;
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}
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public function hasChallenge(): bool {
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return isset($this->challenge) && !empty($this->challenge);
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}
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public function getChallenge(): string {
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return $this->challenge;
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}
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protected function readData(string $data) {
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if (!$this->isConfirmed()) {
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$this->challenge = $data;
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$this->credentialID = null;
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$this->publicKey = null;
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} else {
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$jsonData = json_decode($data, true);
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$this->challenge = $_SESSION["challenge"] ?? "";
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$this->credentialID = base64_decode($jsonData["credentialID"]);
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$this->publicKey = PublicKey::fromJson($jsonData["publicKey"]);
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}
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}
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public function getData(): string {
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if (!$this->isConfirmed()) {
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return $this->challenge;
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} else {
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return json_encode([
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"credentialID" => $this->credentialID,
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"publicKey" => $this->publicKey->jsonSerialize()
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]);
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}
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}
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public function confirmKeyBased(SQL $sql, string $credentialID, PublicKey $publicKey): bool {
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$this->credentialID = $credentialID;
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$this->publicKey = $publicKey;
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return parent::confirm($sql);
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}
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public function getPublicKey(): ?PublicKey {
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return $this->publicKey;
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}
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public function getCredentialId(): ?string {
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return $this->credentialID;
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}
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public function jsonSerialize(?array $propertyNames = null): array {
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$jsonData = parent::jsonSerialize();
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if (!$this->isAuthenticated()) {
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if (!empty($this->challenge) && ($propertyNames === null || in_array("challenge", $propertyNames))) {
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$jsonData["challenge"] = $this->challenge;
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}
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if (!empty($this->credentialID) && ($propertyNames === null || in_array("credentialID", $propertyNames))) {
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$jsonData["credentialID"] = base64_encode($this->credentialID);
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}
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}
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return $jsonData;
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}
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// TODO: algorithms, hardcoded values, ...
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public function verify(string $signature, string $data): bool {
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switch ($this->publicKey->getUsedAlgorithm()) {
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case -7: // EC2
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if (strlen($signature) !== 64) {
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$signature = \Cose\Algorithm\Signature\ECDSA\ECSignature::fromAsn1($signature, 64);
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}
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$coseKey = new \Cose\Key\Key($this->publicKey->getNormalizedData());
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$ec2key = new \Cose\Key\Ec2Key($coseKey->getData());
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$publicKey = $ec2key->toPublic();
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$signature = ECSignature::toAsn1($signature, 64);
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return openssl_verify($data, $signature, $publicKey->asPEM(), "sha256") === 1;
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default:
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// Not implemented :(
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return false;
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}
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}
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} |