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<?php |
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/** |
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* Nucleus - XMPP Library for PHP |
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* |
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* Copyright (C) 2016, Some rights reserved. |
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* |
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* @author Kacper "Kadet" Donat <[email protected]> |
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* |
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* Contact with author: |
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* Xmpp: [email protected] |
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* E-mail: [email protected] |
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* |
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* From Kadet with love. |
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*/ |
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namespace Kadet\Xmpp\Component; |
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use Fabiang\Sasl\Authentication\AuthenticationInterface; |
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use Fabiang\Sasl\Authentication\ChallengeAuthenticationInterface; |
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use Fabiang\Sasl\Exception\InvalidArgumentException; |
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use Fabiang\Sasl\Sasl; |
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use Kadet\Xmpp\Exception\Protocol\AuthenticationException; |
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use Kadet\Xmpp\Sasl\SaslFactory; |
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use Kadet\Xmpp\Stream\Features; |
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use Kadet\Xmpp\Xml\XmlElement; |
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use Kadet\Xmpp\XmppClient; |
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use Kadet\Xmpp\Utils\filter as with; |
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use function Kadet\Xmpp\Utils\filter\{ |
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all, in |
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}; |
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class SaslAuthenticator extends Component implements Authenticator |
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{ |
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const XMLNS = 'urn:ietf:params:xml:ns:xmpp-sasl'; |
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/** |
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* Client's password used in authorisation. |
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* |
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* @var string |
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*/ |
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private $_password; |
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/** |
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* Factory used to create mechanisms |
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* |
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* @var Sasl |
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*/ |
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private $_sasl; |
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/** |
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* Authentication constructor. |
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* |
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* @param string $password Client's password |
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* @param Sasl $sasl Factory used to create mechanisms |
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*/ |
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public function __construct($password = null, Sasl $sasl = null) |
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{ |
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$this->setPassword($password); |
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$this->_sasl = $sasl ?: new SaslFactory(); |
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} |
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public function setClient(XmppClient $client) |
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{ |
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parent::setClient($client); |
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$client->on('features', function (Features $features) { |
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return !$this->auth($features); |
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}); |
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} |
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public function auth(Features $features) |
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{ |
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if (!empty($features->mechanisms)) { |
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foreach ($features->mechanisms as $name) { |
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if($this->tryMechanism($name)) { |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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private function tryMechanism($name) { |
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try { |
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$mechanism = $this->_sasl->factory($name, [ |
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'authcid' => $this->_client->jid->local, |
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'secret' => $this->_password, |
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'hostname' => $this->_client->jid->domain, |
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'service' => 'xmpp' |
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]); |
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$this->_client->getLogger()->debug('Starting auth using {name} mechanism.', ['name' => $name]); |
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$auth = new XmlElement('auth', self::XMLNS); |
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$auth->setAttribute('mechanism', $name); |
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$response = $mechanism instanceof ChallengeAuthenticationInterface |
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? $this->mechanismWithChallenge($mechanism) |
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: $this->mechanismWithoutChallenge($mechanism); |
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$auth->append($response ? base64_encode($response) : '='); |
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$this->_client->write($auth); |
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return true; |
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} catch (InvalidArgumentException $e) { |
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return false; |
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} |
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} |
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private function mechanismWithChallenge(ChallengeAuthenticationInterface $mechanism) { |
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try { |
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$response = $mechanism->createResponse(); |
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} catch (InvalidArgumentException $e) { |
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$response = ''; |
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} |
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$callback = $this->_client->on('element', function (XmlElement $challenge) use ($mechanism) { |
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$this->handleChallenge($challenge, $mechanism); |
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}, with\element('challenge', self::XMLNS)); |
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$this->_client->once('element', function (XmlElement $result) use ($callback) { |
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$this->_client->removeListener('element', $callback); |
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$this->handleAuthResult($result); |
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}, $this->_resultPredicate()); |
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return $response; |
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} |
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private function mechanismWithoutChallenge(AuthenticationInterface $mechanism) |
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{ |
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$this->_client->once('element', function (XmlElement $result) { |
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$this->handleAuthResult($result); |
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}, $this->_resultPredicate()); |
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return $mechanism->createResponse(); |
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} |
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private function handleChallenge(XmlElement $challenge, AuthenticationInterface $mechanism) |
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{ |
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$response = new XmlElement('response', self::XMLNS); |
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$response->append(base64_encode($mechanism->createResponse(base64_decode($challenge->innerXml)))); |
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$this->_client->write($response); |
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} |
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private function handleAuthResult(XmlElement $result) |
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{ |
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// todo: handle different scenarios |
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if ($result->localName === 'failure') { |
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throw new AuthenticationException('Unable to auth. '.trim($result->innerXml)); |
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} |
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$this->_client->getLogger()->info('Successfully authorized as {name}.', ['name' => (string)$this->_client->jid]); |
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$this->_client->restart(); |
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} |
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public function setPassword(string $password = null) |
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{ |
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$this->_password = $password; |
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} |
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private function _resultPredicate() |
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{ |
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return all(with\element\name(in('success', 'failure')), with\element\xmlns(self::XMLNS)); |
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} |
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} |
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kadet1090 /
nucleus
