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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\SAML2; |
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use DOMElement; |
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use Exception; |
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use Psr\Http\Message\ServerRequestInterface; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\SAML2\Compat\ContainerSingleton; |
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use SimpleSAML\SAML2\Constants as C; |
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use SimpleSAML\XMLSecurity\Exception\SignatureVerificationFailedException; |
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use SimpleSAML\SAML2\XML\samlp\AbstractMessage; |
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use SimpleSAML\SAML2\XML\samlp\AbstractRequest; |
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use SimpleSAML\SAML2\XML\samlp\MessageFactory; |
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use SimpleSAML\XML\DOMDocumentFactory; |
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use SimpleSAML\XMLSecurity\Key\AbstractKey; |
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use SimpleSAML\XMLSecurity\Key\PublicKey; |
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use SimpleSAML\XMLSecurity\Utils\Security; |
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use SimpleSAML\XMLSecurity\TestUtils\PEMCertificatesMock; |
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use SimpleSAML\XMLSecurity\Alg\Signature\SignatureAlgorithmFactory; |
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use function array_key_exists; |
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use function base64_decode; |
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use function base64_encode; |
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use function gzdeflate; |
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use function gzinflate; |
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use function sprintf; |
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use function strlen; |
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use function strpos; |
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use function urlencode; |
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/** |
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* Class which implements the HTTP-Redirect binding. |
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* |
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* @package simplesamlphp/saml2 |
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*/ |
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class HTTPRedirect extends Binding |
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{ |
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/** |
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* Create the redirect URL for a message. |
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* |
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* @param \SimpleSAML\SAML2\XML\samlp\AbstractMessage $message The message. |
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* @return string The URL the user should be redirected to in order to send a message. |
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*/ |
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public function getRedirectURL(AbstractMessage $message): string |
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{ |
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if ($this->destination === null) { |
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$destination = $message->getDestination(); |
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if ($destination === null) { |
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throw new Exception('Cannot build a redirect URL, no destination set.'); |
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} |
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} else { |
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$destination = $this->destination; |
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} |
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$relayState = $message->getRelayState(); |
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$msgStr = $message->toXML(); |
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Utils::getContainer()->debugMessage($msgStr, 'out'); |
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$msgStr = $msgStr->ownerDocument?->saveXML($msgStr); |
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$msgStr = gzdeflate($msgStr); |
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$msgStr = base64_encode($msgStr); |
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/* Build the query string. */ |
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if ($message instanceof AbstractRequest) { |
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$msg = 'SAMLRequest='; |
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} else { |
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$msg = 'SAMLResponse='; |
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} |
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$msg .= urlencode($msgStr); |
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if ($relayState !== null) { |
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$msg .= '&RelayState=' . urlencode($relayState); |
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} |
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$signature = $message->getSignature(); |
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if ($signature !== null) { // add the signature |
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$msg .= '&SigAlg=' . urlencode($signature->getSignedInfo()->getSignatureMethod()->getAlgorithm()); |
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$msg .= '&Signature=' . urlencode($signature->getSignatureValue()->getContent()); |
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} |
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if (strpos($destination, '?') === false) { |
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$destination .= '?' . $msg; |
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} else { |
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$destination .= '&' . $msg; |
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} |
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return $destination; |
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} |
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/** |
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* Send a SAML 2 message using the HTTP-Redirect binding. |
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* Note: This function never returns. |
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* |
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* @param \SimpleSAML\SAML2\XML\samlp\AbstractMessage $message The message we should send. |
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*/ |
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public function send(AbstractMessage $message): void |
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{ |
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$destination = $this->getRedirectURL($message); |
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Utils::getContainer()->getLogger()->debug('Redirect to ' . strlen($destination) . ' byte URL: ' . $destination); |
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Utils::getContainer()->redirect($destination); |
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} |
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/** |
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* Receive a SAML 2 message sent using the HTTP-Redirect binding. |
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* |
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* Throws an exception if it is unable receive the message. |
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* |
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* @param \Psr\Http\Message\ServerRequestInterface $request |
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* @return \SimpleSAML\SAML2\XML\samlp\AbstractMessage The received message. |
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* @throws \Exception |
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* |
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* NPath is currently too high but solving that just moves code around. |
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*/ |
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public function receive(ServerRequestInterface $request): AbstractMessage |
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{ |
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$query = $request->getQueryParams(); |
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if (array_key_exists('SAMLRequest', $query)) { |
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$message = $query['SAMLRequest']; |
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$signedQuery = 'SAMLRequest=' . urlencode($query['SAMLRequest']); |
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} elseif (array_key_exists('SAMLResponse', $query)) { |
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$message = $query['SAMLResponse']; |
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$signedQuery = 'SAMLResponse=' . urlencode($query['SAMLResponse']); |
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} else { |
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throw new Exception('Missing SAMLRequest or SAMLResponse parameter.'); |
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} |
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if (isset($query['SAMLEncoding']) && $query['SAMLEncoding'] !== C::BINDING_HTTP_REDIRECT_DEFLATE) { |
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throw new Exception(sprintf('Unknown SAMLEncoding: %s', $query['SAMLEncoding'])); |
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} |
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$message = base64_decode($message); |
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if ($message === false) { |
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throw new Exception('Error while base64 decoding SAML message.'); |
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} |
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$message = gzinflate($message); |
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if ($message === false) { |
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throw new Exception('Error while inflating SAML message.'); |
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} |
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$document = DOMDocumentFactory::fromString($message); |
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Utils::getContainer()->debugMessage($document->documentElement, 'in'); |
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$message = MessageFactory::fromXML($document->documentElement); |
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if (array_key_exists('RelayState', $query)) { |
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$message->setRelayState($query['RelayState']); |
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$signedQuery .= '&RelayState=' . urlencode($query['RelayState']); |
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} |
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if (!array_key_exists('Signature', $query)) { |
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return $message; |
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} |
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if (!array_key_exists('SigAlg', $query)) { |
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throw new Exception('Missing signature algorithm.'); |
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} else { |
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$signedQuery .= '&SigAlg=' . urlencode($query['SigAlg']); |
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} |
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$container = ContainerSingleton::getInstance(); |
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$blacklist = $container->getBlacklistedEncryptionAlgorithms(); |
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$verifier = (new SignatureAlgorithmFactory($blacklist))->getAlgorithm( |
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$query['SigAlg'], |
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// TODO: Need to use the key from the metadata |
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PEMCertificatesMock::getPublicKey(PEMCertificatesMock::SELFSIGNED_PUBLIC_KEY), |
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); |
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if ($verifier->verify($signedQuery, base64_decode($query['Signature'])) === false) { |
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throw new SignatureVerificationFailedException('Failed to verify signature.'); |
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} |
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return $message; |
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} |
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} |
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simplesamlphp /
saml2
