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<?php |
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/****************************************************************************** |
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* Wikipedia Account Creation Assistance tool * |
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* * |
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* All code in this file is released into the public domain by the ACC * |
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* Development Team. Please see team.json for a list of contributors. * |
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******************************************************************************/ |
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namespace Waca\Security\CredentialProviders; |
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use Waca\DataObjects\User; |
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use Waca\Exceptions\ApplicationLogicException; |
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use Waca\Helpers\HttpHelper; |
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use Waca\PdoDatabase; |
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use Waca\SiteConfiguration; |
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class YubikeyOtpCredentialProvider extends CredentialProviderBase |
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{ |
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/** @var HttpHelper */ |
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private $httpHelper; |
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/** |
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* @var SiteConfiguration |
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*/ |
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private $configuration; |
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public function __construct(PdoDatabase $database, SiteConfiguration $configuration, HttpHelper $httpHelper) |
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{ |
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parent::__construct($database, $configuration, 'yubikeyotp'); |
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$this->httpHelper = $httpHelper; |
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$this->configuration = $configuration; |
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} |
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public function authenticate(User $user, $data) |
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{ |
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if (is_array($data)) { |
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return false; |
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} |
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$credentialData = $this->getCredentialData($user->getId()); |
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if ($credentialData === null) { |
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return false; |
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} |
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if ($credentialData->getData() !== $this->getYubikeyId($data)) { |
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// different device |
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return false; |
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} |
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return $this->verifyToken($data); |
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} |
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public function setCredential(User $user, $factor, $data) |
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{ |
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$keyId = $this->getYubikeyId($data); |
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$valid = $this->verifyToken($data); |
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if (!$valid) { |
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throw new ApplicationLogicException("Provided token is not valid."); |
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} |
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$storedData = $this->getCredentialData($user->getId()); |
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if ($storedData === null) { |
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$storedData = $this->createNewCredential($user); |
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} |
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$storedData->setData($keyId); |
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$storedData->setFactor($factor); |
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$storedData->setVersion(1); |
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$storedData->setPriority(8); |
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$storedData->save(); |
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} |
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/** |
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* Get the Yubikey ID. |
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* |
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* This looks like it's just dumping the "password" that's stored in the database, but it's actually fine. |
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* |
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* We only store the "serial number" of the Yubikey - if we get a validated (by webservice) token prefixed with the |
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* serial number, that's a successful OTP authentication. Thus, retrieving the stored data is just retrieving the |
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* yubikey's serial number (in modhex format), since the actual security credentials are stored on the device. |
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* |
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* Note that the serial number is actually the credential serial number - it's possible to regenerate the keys on |
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* the device, and that will change the serial number too. |
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* |
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* More information about the structure of OTPs can be found here: |
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* https://developers.yubico.com/OTP/OTPs_Explained.html |
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* |
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* @param int $userId |
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* |
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* @return null|string |
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*/ |
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public function getYubikeyData($userId) |
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{ |
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$credential = $this->getCredentialData($userId); |
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if ($credential === null) { |
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return null; |
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} |
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return $credential->getData(); |
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} |
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/** |
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* @param $result |
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* |
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* @return array |
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*/ |
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private function parseYubicoApiResult($result) |
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{ |
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$data = array(); |
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foreach (explode("\r\n", $result) as $line) { |
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$pos = strpos($line, '='); |
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if ($pos === false) { |
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continue; |
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} |
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$data[substr($line, 0, $pos)] = substr($line, $pos + 1); |
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} |
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return $data; |
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} |
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private function getYubikeyId($data) |
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{ |
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return substr($data, 0, -32); |
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} |
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private function verifyHmac($apiResponse, $apiKey) |
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{ |
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ksort($apiResponse); |
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$signature = $apiResponse['h']; |
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unset($apiResponse['h']); |
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$data = array(); |
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foreach ($apiResponse as $key => $value) { |
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$data[] = $key . "=" . $value; |
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} |
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$dataString = implode('&', $data); |
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$hmac = base64_encode(hash_hmac('sha1', $dataString, base64_decode($apiKey), true)); |
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return $hmac === $signature; |
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} |
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/** |
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* @param $data |
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* |
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* @return bool |
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*/ |
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private function verifyToken($data) |
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{ |
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$result = $this->httpHelper->get('https://api.yubico.com/wsapi/2.0/verify', array( |
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'id' => $this->configuration->getYubicoApiId(), |
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'otp' => $data, |
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'nonce' => md5(openssl_random_pseudo_bytes(64)), |
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)); |
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$apiResponse = $this->parseYubicoApiResult($result); |
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if (!$this->verifyHmac($apiResponse, $this->configuration->getYubicoApiKey())) { |
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return false; |
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} |
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return $apiResponse['status'] == 'OK'; |
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} |
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} |
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enwikipedia-acc /
waca
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