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<?php |
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/** |
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* Copyright 2017 SURFnet bv |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace Surfnet\StepupGateway\SecondFactorOnlyBundle\Adfs; |
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use InvalidArgumentException; |
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use Psr\Log\LoggerInterface; |
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use SAML2_DOMDocumentFactory; |
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use Symfony\Component\HttpFoundation\Request; |
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use Webmozart\Assert\Assert; |
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/** |
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* The Adfs helper service is used to transform Adfs requests. Stripping the Adfs specific parameters. |
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* @package Surfnet\StepupGateway\SecondFactorOnlyBundle\Service |
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*/ |
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final class RequestHelper |
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{ |
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/** @var LoggerInterface */ |
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private $logger; |
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/** @var StateHandler */ |
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private $stateHandler; |
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const ADFS_PARAM_AUTH_METHOD = 'AuthMethod'; |
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const ADFS_PARAM_CONTEXT = 'Context'; |
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const ADFS_PARAM_AUTHNREQUEST = 'request'; |
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const SAML_AUTHNREQUST_PARAM_REQUEST = 'SAMLRequest'; |
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private static $requiredParams = [ |
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self::ADFS_PARAM_AUTH_METHOD, |
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self::ADFS_PARAM_CONTEXT, |
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self::ADFS_PARAM_AUTHNREQUEST |
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]; |
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public function __construct(StateHandler $stateHandler, LoggerInterface $logger) |
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{ |
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$this->stateHandler = $stateHandler; |
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$this->logger = $logger; |
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} |
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/** |
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* @param Request $httpRequest |
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* @return bool |
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*/ |
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public function isAdfsRequest(Request $httpRequest) |
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{ |
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foreach (self::$requiredParams as $param) { |
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if (!$httpRequest->request->has($param)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Transforms the Adfs request to a valid Saml AuthnRequest |
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* |
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* @param Request $httpRequest |
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* @return Request |
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* @throws InvalidArgumentException |
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*/ |
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public function transformRequest(Request $httpRequest) |
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{ |
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$this->logger->notice('Receiving and validating ADFS request parameters'); |
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$authMethod = $httpRequest->request->get(self::ADFS_PARAM_AUTH_METHOD); |
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$context = $httpRequest->request->get(self::ADFS_PARAM_CONTEXT); |
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$authnRequest = $httpRequest->request->get(self::ADFS_PARAM_AUTHNREQUEST); |
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Assert::stringNotEmpty($authMethod); |
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Assert::stringNotEmpty($context); |
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Assert::stringNotEmpty($authnRequest); |
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$requestId = $this->getRequestIdFrom($authnRequest); |
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$this->logger->notice(sprintf('Store ADFS parameters for request id: "%s"', $requestId)); |
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$this->stateHandler |
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->setRequestId($requestId) |
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->setAuthMethod($authMethod) |
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->setContext($context); |
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$this->logger->notice('Transforming ADFS Request to a valid AuthnRequest'); |
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$httpRequest->request->set( |
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self::SAML_AUTHNREQUST_PARAM_REQUEST, |
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$authnRequest |
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); |
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$httpRequest->request->remove(self::ADFS_PARAM_AUTH_METHOD); |
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$httpRequest->request->remove(self::ADFS_PARAM_CONTEXT); |
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return $httpRequest; |
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} |
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/** |
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* @param string $samlRequest |
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* @return string |
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* @throws InvalidArgumentException |
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*/ |
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private function getRequestIdFrom($samlRequest) |
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{ |
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// additional security against XXE Processing vulnerability |
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$previous = libxml_disable_entity_loader(true); |
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$document = SAML2_DOMDocumentFactory::fromString(base64_decode($samlRequest)); |
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libxml_disable_entity_loader($previous); |
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$samlRequestNode = $document->firstChild; |
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if (!$samlRequestNode->hasAttribute('ID')) { |
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throw new InvalidArgumentException('The received AuthnRequest does not have a request id'); |
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} |
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return $samlRequestNode->getAttribute('ID'); |
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} |
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} |
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OpenConext /
Stepup-Gateway
