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<?php
declare(strict_types=1);
/**
* Implementation of the Shibboleth 1.3 Artifact binding.
*
* @package SimpleSAMLphp
* @deprecated This class will be removed in a future release
*/
namespace SimpleSAML\Bindings\Shib13;
use SAML2\DOMDocumentFactory;
use SimpleSAML\Configuration;
use SimpleSAML\Error;
use SimpleSAML\Utils;
class Artifact
{
/**
* Parse the query string, and extract the SAMLart parameters.
*
* This function is required because each query contains multiple
* artifact with the same parameter name.
*
* @return array The artifacts.
*/
private static function getArtifacts(): array
{
assert(array_key_exists('QUERY_STRING', $_SERVER));
// We need to process the query string manually, to capture all SAMLart parameters
$artifacts = [];
$elements = explode('&', $_SERVER['QUERY_STRING']);
foreach ($elements as $element) {
list($name, $value) = explode('=', $element, 2);
$name = urldecode($name);
$value = urldecode($value);
if ($name === 'SAMLart') {
$artifacts[] = $value;
}
}
return $artifacts;
}
/**
* Build the request we will send to the IdP.
*
* @param array $artifacts The artifacts we will request.
* @return string The request, as an XML string.
*/
private static function buildRequest(array $artifacts): string
{
$msg = '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">'.
'<SOAP-ENV:Body>'.
'<samlp:Request xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol"'.
' RequestID="'.Utils\Random::generateID().'"'.
' MajorVersion="1" MinorVersion="1"'.
' IssueInstant="'.Utils\Time::generateTimestamp().'"'.
'>';
foreach ($artifacts as $a) {
$msg .= '<samlp:AssertionArtifact>'.htmlspecialchars($a).'</samlp:AssertionArtifact>';
}
$msg .= '</samlp:Request>'.
'</SOAP-ENV:Body>'.
'</SOAP-ENV:Envelope>';
return $msg;
}
/**
* Extract the response element from the SOAP response.
*
* @param string $soapResponse The SOAP response.
* @return string The <saml1p:Response> element, as a string.
* @throws Error\Exception
*/
private static function extractResponse(string $soapResponse): string
{
try {
$doc = DOMDocumentFactory::fromString($soapResponse);
} catch (\Exception $e) {
throw new Error\Exception('Error parsing SAML 1 artifact response.');
}
$soapEnvelope = $doc->firstChild;
if (!Utils\XML::isDOMNodeOfType($soapEnvelope, 'Envelope', 'http://schemas.xmlsoap.org/soap/envelope/')) {
throw new Error\Exception('Expected artifact response to contain a <soap:Envelope> element.');
}
$soapBody = Utils\XML::getDOMChildren($soapEnvelope, 'Body', 'http://schemas.xmlsoap.org/soap/envelope/');
if (count($soapBody) === 0) {
throw new Error\Exception('Couldn\'t find <soap:Body> in <soap:Envelope>.');
}
$soapBody = $soapBody[0];
$responseElement = Utils\XML::getDOMChildren($soapBody, 'Response', 'urn:oasis:names:tc:SAML:1.0:protocol');
if (count($responseElement) === 0) {
throw new Error\Exception('Couldn\'t find <saml1p:Response> in <soap:Body>.');
}
$responseElement = $responseElement[0];
/*
* Save the <saml1p:Response> element. Note that we need to import it
* into a new document, in order to preserve namespace declarations.
*/
$newDoc = DOMDocumentFactory::create();
$newDoc->appendChild($newDoc->importNode($responseElement, true));
$responseXML = $newDoc->saveXML();
return $responseXML;
}
/**
* This function receives a SAML 1.1 artifact.
*
* @param \SimpleSAML\Configuration $spMetadata The metadata of the SP.
* @param \SimpleSAML\Configuration $idpMetadata The metadata of the IdP.
* @return string The <saml1p:Response> element, as an XML string.
* @throws Error\Exception
*/
public static function receive(Configuration $spMetadata, Configuration $idpMetadata)
{
$artifacts = self::getArtifacts();
$request = self::buildRequest($artifacts);
Utils\XML::debugSAMLMessage($request, 'out');
/** @var array $url */
$url = $idpMetadata->getDefaultEndpoint(
'ArtifactResolutionService',
['urn:oasis:names:tc:SAML:1.0:bindings:SOAP-binding']
);
$url = $url['Location'];
$peerPublicKeys = $idpMetadata->getPublicKeys('signing', true);
$certData = '';
foreach ($peerPublicKeys as $key) {
if ($key['type'] !== 'X509Certificate') {
continue;
}
$certData .= "-----BEGIN CERTIFICATE-----\n".
chunk_split($key['X509Certificate'], 64).
"-----END CERTIFICATE-----\n";
}
$file = Utils\System::getTempDir().DIRECTORY_SEPARATOR.sha1($certData).'.crt';
if (!file_exists($file)) {
Utils\System::writeFile($file, $certData);
}
$spKeyCertFile = Utils\Config::getCertPath($spMetadata->getString('privatekey'));
$opts = [
'ssl' => [
'verify_peer' => true,
'cafile' => $file,
'local_cert' => $spKeyCertFile,
'capture_peer_cert' => true,
'capture_peer_chain' => true,
],
'http' => [
'method' => 'POST',
'content' => $request,
'header' => 'SOAPAction: http://www.oasis-open.org/committees/security'."\r\n".
'Content-Type: text/xml',
],
];
// Fetch the artifact
/** @var string $response */
$response = Utils\HTTP::fetch($url, $opts);
Utils\XML::debugSAMLMessage($response, 'in');
// Find the response in the SOAP message
$response = self::extractResponse($response);
return $response;
}
}
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