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<?php |
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declare(strict_types=1); |
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/** |
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* A Shibboleth 1.3 authentication response. |
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* |
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* @author Andreas Åkre Solberg, UNINETT AS. <[email protected]> |
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* @package SimpleSAMLphp |
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*/ |
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namespace SimpleSAML\Module\casserver\Shib13; |
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use DOMDocument; |
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use DOMNode; |
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use DOMNodeList; |
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use DOMXpath; |
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use SAML2\DOMDocumentFactory; |
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use SimpleSAML\Configuration; |
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use SimpleSAML\Error; |
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use SimpleSAML\Metadata\MetaDataStorageHandler; |
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use SimpleSAML\Utils; |
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use SimpleSAML\XML\Validator; |
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class AuthnResponse |
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{ |
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/** |
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* @var \SimpleSAML\XML\Validator|null This variable contains an XML validator for this message. |
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*/ |
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private $validator = null; |
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/** |
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* @var bool Whether this response was validated by some external means (e.g. SSL). |
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*/ |
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private $messageValidated = false; |
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/** @var string */ |
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public const SHIB_PROTOCOL_NS = 'urn:oasis:names:tc:SAML:1.0:protocol'; |
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/** @var string */ |
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public const SHIB_ASSERT_NS = 'urn:oasis:names:tc:SAML:1.0:assertion'; |
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/** |
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* @var \DOMDocument|null The DOMDocument which represents this message. |
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*/ |
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private $dom = null; |
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/** |
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* @var string|null The relaystate which is associated with this response. |
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*/ |
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private $relayState = null; |
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/** |
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* Set whether this message was validated externally. |
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* |
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* @param bool $messageValidated TRUE if the message is already validated, FALSE if not. |
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* @return void |
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*/ |
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public function setMessageValidated(bool $messageValidated): void |
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{ |
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$this->messageValidated = $messageValidated; |
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} |
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/** |
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* @param string $xml |
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* @throws \Exception |
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* @return void |
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*/ |
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public function setXML(string $xml): void |
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{ |
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try { |
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$this->dom = DOMDocumentFactory::fromString(str_replace("\r", "", $xml)); |
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} catch (\Exception $e) { |
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throw new \Exception('Unable to parse AuthnResponse XML.'); |
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} |
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} |
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/** |
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* @param string|null $relayState |
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* @return void |
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*/ |
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public function setRelayState(?string $relayState) : void |
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{ |
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$this->relayState = $relayState; |
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} |
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/** |
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* @return string|null |
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*/ |
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public function getRelayState(): ?string |
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{ |
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return $this->relayState; |
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} |
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/** |
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* @throws \SimpleSAML\Error\Exception |
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* @return bool |
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*/ |
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public function validate(): bool |
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{ |
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assert($this->dom instanceof DOMDocument); |
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if ($this->messageValidated) { |
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// This message was validated externally |
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return true; |
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} |
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// Validate the signature |
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$this->validator = new Validator($this->dom, ['ResponseID', 'AssertionID']); |
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// Get the issuer of the response |
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$issuer = $this->getIssuer(); |
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// Get the metadata of the issuer |
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$metadata = MetaDataStorageHandler::getMetadataHandler(); |
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$md = $metadata->getMetaDataConfig($issuer, 'shib13-idp-remote'); |
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$publicKeys = $md->getPublicKeys('signing'); |
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if (!empty($publicKeys)) { |
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$certFingerprints = []; |
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foreach ($publicKeys as $key) { |
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if ($key['type'] !== 'X509Certificate') { |
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continue; |
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} |
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$certFingerprints[] = sha1(base64_decode($key['X509Certificate'])); |
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} |
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$this->validator->validateFingerprint($certFingerprints); |
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} elseif ($md->hasValue('certFingerprint')) { |
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$certFingerprints = $md->getArrayizeString('certFingerprint'); |
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// Validate the fingerprint |
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$this->validator->validateFingerprint($certFingerprints); |
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} elseif ($md->hasValue('caFile')) { |
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// Validate against CA |
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$this->validator->validateCA(Utils\Config::getCertPath($md->getString('caFile'))); |
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} else { |
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throw new Error\Exception( |
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'Missing certificate in Shibboleth 1.3 IdP Remote metadata for identity provider [' . $issuer . '].' |
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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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* Checks if the given node is validated by the signature on this response. |
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* |
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* @param \DOMElement|\SimpleXMLElement $node Node to be validated. |
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* @return bool TRUE if the node is validated or FALSE if not. |
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*/ |
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private function isNodeValidated($node): bool |
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{ |
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if ($this->messageValidated) { |
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// This message was validated externally |
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return true; |
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} |
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if ($this->validator === null) { |
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return false; |
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} |
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// Convert the node to a DOM node if it is an element from SimpleXML |
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if ($node instanceof \SimpleXMLElement) { |
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$node = dom_import_simplexml($node); |
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} |
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assert($node instanceof DOMNode); |
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return $this->validator->isNodeValidated($node); |
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} |
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/** |
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* This function runs an xPath query on this authentication response. |
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* |
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* @param string $query The query which should be run. |
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* @param \DOMNode $node The node which this query is relative to. If this node is NULL (the default) |
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* then the query will be relative to the root of the response. |
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* @return \DOMNodeList |
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*/ |
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private function doXPathQuery(string $query, DOMNode $node = null): DOMNodeList |
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{ |
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assert($this->dom instanceof DOMDocument); |
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if ($node === null) { |
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$node = $this->dom->documentElement; |
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} |
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assert($node instanceof DOMNode); |
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$xPath = new DOMXpath($this->dom); |
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$xPath->registerNamespace('shibp', self::SHIB_PROTOCOL_NS); |
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$xPath->registerNamespace('shib', self::SHIB_ASSERT_NS); |
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return $xPath->query($query, $node); |
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} |
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/** |
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* Retrieve the session index of this response. |
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* |
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* @return string|null The session index of this response. |
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*/ |
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public function getSessionIndex(): ?string |
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{ |
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assert($this->dom instanceof DOMDocument); |
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$query = '/shibp:Response/shib:Assertion/shib:AuthnStatement'; |
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$nodelist = $this->doXPathQuery($query); |
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if ($node = $nodelist->item(0)) { |
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return $node->getAttribute('SessionIndex'); |
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} |
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return null; |
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} |
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/** |
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* @throws \Exception |
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* @return array |
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*/ |
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public function getAttributes(): array |
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{ |
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$metadata = MetaDataStorageHandler::getMetadataHandler(); |
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$md = $metadata->getMetaData($this->getIssuer(), 'shib13-idp-remote'); |
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$base64 = isset($md['base64attributes']) ? $md['base64attributes'] : false; |
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if (!($this->dom instanceof DOMDocument)) { |
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return []; |
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} |
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$attributes = []; |
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$assertions = $this->doXPathQuery('/shibp:Response/shib:Assertion'); |
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foreach ($assertions as $assertion) { |
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if (!$this->isNodeValidated($assertion)) { |
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throw new \Exception('Shib13 AuthnResponse contained an unsigned assertion.'); |
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} |
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$conditions = $this->doXPathQuery('shib:Conditions', $assertion); |
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if ($conditions->length > 0) { |
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$condition = $conditions->item(0); |
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$start = $condition->getAttribute('NotBefore'); |
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$end = $condition->getAttribute('NotOnOrAfter'); |
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if ($start && $end) { |
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if (!self::checkDateConditions($start, $end)) { |
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error_log('Date check failed ... (from ' . $start . ' to ' . $end . ')'); |
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continue; |
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} |
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} |
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} |
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$attribute_nodes = $this->doXPathQuery( |
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'shib:AttributeStatement/shib:Attribute/shib:AttributeValue', |
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$assertion |
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); |
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foreach ($attribute_nodes as $attribute) { |
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/** @var \DOMElement $attribute */ |
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$value = $attribute->textContent; |
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/** @var \DOMElement $parentNode */ |
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$parentNode = $attribute->parentNode; |
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$name = $parentNode->getAttribute('AttributeName'); |
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if ($attribute->hasAttribute('Scope')) { |
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$scopePart = '@' . $attribute->getAttribute('Scope'); |
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} else { |
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$scopePart = ''; |
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} |
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if (empty($name)) { |
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throw new \Exception('Shib13 Attribute node without an AttributeName.'); |
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} |
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if (!array_key_exists($name, $attributes)) { |
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$attributes[$name] = []; |
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} |
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if ($base64) { |
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$encodedvalues = explode('_', $value); |
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foreach ($encodedvalues as $v) { |
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$attributes[$name][] = base64_decode($v) . $scopePart; |
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} |
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} else { |
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$attributes[$name][] = $value . $scopePart; |
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} |
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} |
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} |
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return $attributes; |
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} |
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/** |
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* @throws \Exception |
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* @return string |
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*/ |
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public function getIssuer(): string |
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{ |
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$query = '/shibp:Response/shib:Assertion/@Issuer'; |
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$nodelist = $this->doXPathQuery($query); |
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if ($attr = $nodelist->item(0)) { |
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return $attr->value; |
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} else { |
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throw new \Exception('Could not find Issuer field in Authentication response'); |
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} |
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} |
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/** |
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* @return array |
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*/ |
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public function getNameID(): array |
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{ |
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$nameID = []; |
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$query = '/shibp:Response/shib:Assertion/shib:AuthenticationStatement/shib:Subject/shib:NameIdentifier'; |
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$nodelist = $this->doXPathQuery($query); |
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if ($node = $nodelist->item(0)) { |
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$nameID["Value"] = $node->nodeValue; |
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$nameID["Format"] = $node->getAttribute('Format'); |
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} |
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return $nameID; |
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} |
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/** |
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* Build a authentication response. |
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* |
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* @param \SimpleSAML\Configuration $idp Metadata for the IdP the response is sent from. |
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* @param \SimpleSAML\Configuration $sp Metadata for the SP the response is sent to. |
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* @param string $shire The endpoint on the SP the response is sent to. |
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* @param array|null $attributes The attributes which should be included in the response. |
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* @return string The response. |
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*/ |
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public function generate(Configuration $idp, Configuration $sp, string $shire, ?array $attributes): string |
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{ |
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if ($sp->hasValue('scopedattributes')) { |
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$scopedAttributes = $sp->getArray('scopedattributes'); |
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} elseif ($idp->hasValue('scopedattributes')) { |
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$scopedAttributes = $idp->getArray('scopedattributes'); |
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} else { |
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$scopedAttributes = []; |
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} |
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$id = Utils\Random::generateID(); |
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$issueInstant = Utils\Time::generateTimestamp(); |
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// 30 seconds timeskew back in time to allow differing clocks |
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$notBefore = Utils\Time::generateTimestamp(time() - 30); |
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$assertionExpire = Utils\Time::generateTimestamp(time() + 300); // 5 minutes |
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$assertionid = Utils\Random::generateID(); |
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$spEntityId = $sp->getString('entityid'); |
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$audience = $sp->getString('audience', $spEntityId); |
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$base64 = $sp->getBoolean('base64attributes', false); |
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$namequalifier = $sp->getString('NameQualifier', $spEntityId); |
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$nameid = Utils\Random::generateID(); |
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$subjectNode = |
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'<Subject>' . |
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|
|
|
'<NameIdentifier' . |
379
|
|
|
' Format="urn:mace:shibboleth:1.0:nameIdentifier"' . |
380
|
|
|
' NameQualifier="' . htmlspecialchars($namequalifier) . '"' . |
381
|
|
|
'>' . |
382
|
|
|
htmlspecialchars($nameid) . |
383
|
|
|
'</NameIdentifier>' . |
384
|
|
|
'<SubjectConfirmation>' . |
385
|
|
|
'<ConfirmationMethod>' . |
386
|
|
|
'urn:oasis:names:tc:SAML:1.0:cm:bearer' . |
387
|
|
|
'</ConfirmationMethod>' . |
388
|
|
|
'</SubjectConfirmation>' . |
389
|
|
|
'</Subject>'; |
390
|
|
|
|
391
|
|
|
$encodedattributes = ''; |
392
|
|
|
|
393
|
|
|
if (is_array($attributes)) { |
|
|
|
|
394
|
|
|
$encodedattributes .= '<AttributeStatement>'; |
395
|
|
|
$encodedattributes .= $subjectNode; |
396
|
|
|
|
397
|
|
|
foreach ($attributes as $name => $value) { |
398
|
|
|
$encodedattributes .= $this->encAttribute($name, $value, $base64, $scopedAttributes); |
399
|
|
|
} |
400
|
|
|
|
401
|
|
|
$encodedattributes .= '</AttributeStatement>'; |
402
|
|
|
} |
403
|
|
|
|
404
|
|
|
/* |
405
|
|
|
* The SAML 1.1 response message |
406
|
|
|
*/ |
407
|
|
|
$response = '<Response xmlns="urn:oasis:names:tc:SAML:1.0:protocol" |
408
|
|
|
xmlns:saml="urn:oasis:names:tc:SAML:1.0:assertion" |
409
|
|
|
xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol" xmlns:xsd="http://www.w3.org/2001/XMLSchema" |
410
|
|
|
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" IssueInstant="' . $issueInstant . '" |
411
|
|
|
MajorVersion="1" MinorVersion="1" |
412
|
|
|
Recipient="' . htmlspecialchars($shire) . '" ResponseID="' . $id . '"> |
413
|
|
|
<Status> |
414
|
|
|
<StatusCode Value="samlp:Success" /> |
415
|
|
|
</Status> |
416
|
|
|
<Assertion xmlns="urn:oasis:names:tc:SAML:1.0:assertion" |
417
|
|
|
AssertionID="' . $assertionid . '" IssueInstant="' . $issueInstant . '" |
418
|
|
|
Issuer="' . htmlspecialchars($idp->getString('entityid')) . '" MajorVersion="1" MinorVersion="1"> |
419
|
|
|
<Conditions NotBefore="' . $notBefore . '" NotOnOrAfter="' . $assertionExpire . '"> |
420
|
|
|
<AudienceRestrictionCondition> |
421
|
|
|
<Audience>' . htmlspecialchars($audience) . '</Audience> |
422
|
|
|
</AudienceRestrictionCondition> |
423
|
|
|
</Conditions> |
424
|
|
|
<AuthenticationStatement AuthenticationInstant="' . $issueInstant . '" |
425
|
|
|
AuthenticationMethod="urn:oasis:names:tc:SAML:1.0:am:unspecified">' . |
426
|
|
|
$subjectNode . ' |
427
|
|
|
</AuthenticationStatement> |
428
|
|
|
' . $encodedattributes . ' |
429
|
|
|
</Assertion> |
430
|
|
|
</Response>'; |
431
|
|
|
|
432
|
|
|
return $response; |
433
|
|
|
} |
434
|
|
|
|
435
|
|
|
|
436
|
|
|
/** |
437
|
|
|
* Format a shib13 attribute. |
438
|
|
|
* |
439
|
|
|
* @param string $name Name of the attribute. |
440
|
|
|
* @param array $values Values of the attribute (as an array of strings). |
441
|
|
|
* @param bool $base64 Whether the attriubte values should be base64-encoded. |
442
|
|
|
* @param array $scopedAttributes Array of attributes names which are scoped. |
443
|
|
|
* @return string The attribute encoded as an XML-string. |
444
|
|
|
*/ |
445
|
|
|
private function encAttribute(string $name, array $values, bool $base64, array $scopedAttributes): string |
446
|
|
|
{ |
447
|
|
|
if (in_array($name, $scopedAttributes, true)) { |
448
|
|
|
$scoped = true; |
449
|
|
|
} else { |
450
|
|
|
$scoped = false; |
451
|
|
|
} |
452
|
|
|
|
453
|
|
|
$attr = '<Attribute AttributeName="' . htmlspecialchars($name) . |
454
|
|
|
'" AttributeNamespace="urn:mace:shibboleth:1.0:attributeNamespace:uri">'; |
455
|
|
|
foreach ($values as $value) { |
456
|
|
|
$scopePart = ''; |
457
|
|
|
if ($scoped) { |
458
|
|
|
$tmp = explode('@', $value, 2); |
459
|
|
|
if (count($tmp) === 2) { |
460
|
|
|
$value = $tmp[0]; |
461
|
|
|
$scopePart = ' Scope="' . htmlspecialchars($tmp[1]) . '"'; |
462
|
|
|
} |
463
|
|
|
} |
464
|
|
|
|
465
|
|
|
if ($base64) { |
466
|
|
|
$value = base64_encode($value); |
467
|
|
|
} |
468
|
|
|
|
469
|
|
|
$attr .= '<AttributeValue' . $scopePart . '>' . htmlspecialchars($value) . '</AttributeValue>'; |
470
|
|
|
} |
471
|
|
|
$attr .= '</Attribute>'; |
472
|
|
|
|
473
|
|
|
return $attr; |
474
|
|
|
} |
475
|
|
|
|
476
|
|
|
/** |
477
|
|
|
* Check if we are currently between the given date & time conditions. |
478
|
|
|
* |
479
|
|
|
* Note that this function allows a 10-minute leap from the initial time as marked by $start. |
480
|
|
|
* |
481
|
|
|
* @param string|null $start A SAML2 timestamp marking the start of the period to check. Defaults to null, in which |
482
|
|
|
* case there's no limitations in the past. |
483
|
|
|
* @param string|null $end A SAML2 timestamp marking the end of the period to check. Defaults to null, in which |
484
|
|
|
* case there's no limitations in the future. |
485
|
|
|
* |
486
|
|
|
* @return bool True if the current time belongs to the period specified by $start and $end. False otherwise. |
487
|
|
|
* |
488
|
|
|
* @see \SAML2\Utils::xsDateTimeToTimestamp. |
489
|
|
|
* |
490
|
|
|
* @author Andreas Solberg, UNINETT AS <[email protected]> |
491
|
|
|
* @author Olav Morken, UNINETT AS <[email protected]> |
492
|
|
|
*/ |
493
|
|
|
protected static function checkDateConditions(string $start = null, string $end = null): bool |
494
|
|
|
{ |
495
|
|
|
$currentTime = time(); |
496
|
|
|
|
497
|
|
|
if (!empty($start)) { |
498
|
|
|
$startTime = \SAML2\Utils::xsDateTimeToTimestamp($start); |
499
|
|
|
// allow for a 10 minute difference in time |
500
|
|
|
if (($startTime < 0) || (($startTime - 600) > $currentTime)) { |
501
|
|
|
return false; |
502
|
|
|
} |
503
|
|
|
} |
504
|
|
|
if (!empty($end)) { |
505
|
|
|
$endTime = \SAML2\Utils::xsDateTimeToTimestamp($end); |
506
|
|
|
if (($endTime < 0) || ($endTime <= $currentTime)) { |
507
|
|
|
return false; |
508
|
|
|
} |
509
|
|
|
} |
510
|
|
|
return true; |
511
|
|
|
} |
512
|
|
|
} |
513
|
|
|
|
This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces.
This is most likely a typographical error or the method has been renamed.