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337
lib/SimpleSAML/Metadata/Sources/MDQ.php
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337
lib/SimpleSAML/Metadata/Sources/MDQ.php
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<?php
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namespace SimpleSAML\Metadata\Sources;
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use SimpleSAML\Logger;
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use SimpleSAML\Utils\HTTP;
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/**
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* This class implements SAML Metadata Query Protocol
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*
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* @author Andreas Åkre Solberg, UNINETT AS.
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* @author Olav Morken, UNINETT AS.
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* @author Tamas Frank, NIIFI
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* @package SimpleSAMLphp
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*/
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class MDQ extends \SimpleSAML_Metadata_MetaDataStorageSource
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{
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/**
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* The URL of MDQ server (url:port)
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*
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* @var string
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*/
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private $server;
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/**
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* The fingerprint of the certificate used to sign the metadata. You don't need this option if you don't want to
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* validate the signature on the metadata.
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*
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* @var string|null
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*/
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private $validateFingerprint;
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/**
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* The cache directory, or null if no cache directory is configured.
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*
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* @var string|null
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*/
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private $cacheDir;
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/**
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* The maximum cache length, in seconds.
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*
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* @var integer
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*/
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private $cacheLength;
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/**
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* This function initializes the dynamic XML metadata source.
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*
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* Options:
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* - 'server': URL of the MDQ server (url:port). Mandatory.
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* - 'validateFingerprint': The fingerprint of the certificate used to sign the metadata.
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* You don't need this option if you don't want to validate the signature on the metadata.
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* Optional.
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* - 'cachedir': Directory where metadata can be cached. Optional.
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* - 'cachelength': Maximum time metadata cah be cached, in seconds. Default to 24
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* hours (86400 seconds).
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*
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* @param array $config The configuration for this instance of the XML metadata source.
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*
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* @throws \Exception If no server option can be found in the configuration.
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*/
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protected function __construct($config)
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{
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assert(is_array($config));
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if (!array_key_exists('server', $config)) {
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throw new \Exception(__CLASS__.": the 'server' configuration option is not set.");
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} else {
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$this->server = $config['server'];
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}
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if (array_key_exists('validateFingerprint', $config)) {
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$this->validateFingerprint = $config['validateFingerprint'];
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} else {
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$this->validateFingerprint = null;
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}
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if (array_key_exists('cachedir', $config)) {
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$globalConfig = \SimpleSAML_Configuration::getInstance();
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$this->cacheDir = $globalConfig->resolvePath($config['cachedir']);
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} else {
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$this->cacheDir = null;
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}
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if (array_key_exists('cachelength', $config)) {
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$this->cacheLength = $config['cachelength'];
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} else {
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$this->cacheLength = 86400;
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}
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}
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/**
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* This function is not implemented.
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*
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* @param string $set The set we want to list metadata for.
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*
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* @return array An empty array.
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*/
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public function getMetadataSet($set)
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{
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// we don't have this metadata set
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return array();
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}
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/**
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* Find the cache file name for an entity,
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*
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* @param string $set The metadata set this entity belongs to.
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* @param string $entityId The entity id of this entity.
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*
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* @return string The full path to the cache file.
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*/
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private function getCacheFilename($set, $entityId)
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{
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assert(is_string($set));
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assert(is_string($entityId));
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$cachekey = sha1($entityId);
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return $this->cacheDir.'/'.$set.'-'.$cachekey.'.cached.xml';
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}
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/**
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* Load a entity from the cache.
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*
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* @param string $set The metadata set this entity belongs to.
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* @param string $entityId The entity id of this entity.
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*
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* @return array|NULL The associative array with the metadata for this entity, or NULL
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* if the entity could not be found.
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* @throws \Exception If an error occurs while loading metadata from cache.
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*/
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private function getFromCache($set, $entityId)
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{
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assert(is_string($set));
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assert(is_string($entityId));
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if (empty($this->cacheDir)) {
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return null;
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}
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$cachefilename = $this->getCacheFilename($set, $entityId);
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if (!file_exists($cachefilename)) {
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return null;
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}
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if (!is_readable($cachefilename)) {
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throw new \Exception(__CLASS__.': could not read cache file for entity ['.$cachefilename.']');
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}
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Logger::debug(__CLASS__.': reading cache ['.$entityId.'] => ['.$cachefilename.']');
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/* Ensure that this metadata isn't older that the cachelength option allows. This
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* must be verified based on the file, since this option may be changed after the
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* file is written.
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*/
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$stat = stat($cachefilename);
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if ($stat['mtime'] + $this->cacheLength <= time()) {
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Logger::debug(__CLASS__.': cache file older that the cachelength option allows.');
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return null;
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}
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$rawData = file_get_contents($cachefilename);
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if (empty($rawData)) {
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$error = error_get_last();
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throw new \Exception(
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__CLASS__.': error reading metadata from cache file "'.$cachefilename.'": '.$error['message']
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);
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}
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$data = unserialize($rawData);
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if ($data === false) {
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throw new \Exception(__CLASS__.': error unserializing cached data from file "'.$cachefilename.'".');
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}
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if (!is_array($data)) {
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throw new \Exception(__CLASS__.': Cached metadata from "'.$cachefilename.'" wasn\'t an array.');
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}
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return $data;
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}
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/**
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* Save a entity to the cache.
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*
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* @param string $set The metadata set this entity belongs to.
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* @param string $entityId The entity id of this entity.
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* @param array $data The associative array with the metadata for this entity.
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*
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* @throws \Exception If metadata cannot be written to cache.
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*/
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private function writeToCache($set, $entityId, $data)
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{
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assert(is_string($set));
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assert(is_string($entityId));
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assert(is_array($data));
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if (empty($this->cacheDir)) {
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return;
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}
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$cachefilename = $this->getCacheFilename($set, $entityId);
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if (!is_writable(dirname($cachefilename))) {
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throw new \Exception(__CLASS__.': could not write cache file for entity ['.$cachefilename.']');
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}
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Logger::debug(__CLASS__.': Writing cache ['.$entityId.'] => ['.$cachefilename.']');
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file_put_contents($cachefilename, serialize($data));
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}
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/**
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* Retrieve metadata for the correct set from a SAML2Parser.
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*
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* @param \SimpleSAML_Metadata_SAMLParser $entity A SAML2Parser representing an entity.
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* @param string $set The metadata set we are looking for.
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*
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* @return array|NULL The associative array with the metadata, or NULL if no metadata for
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* the given set was found.
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*/
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private static function getParsedSet(\SimpleSAML_Metadata_SAMLParser $entity, $set)
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{
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assert(is_string($set));
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switch ($set) {
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case 'saml20-idp-remote':
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return $entity->getMetadata20IdP();
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case 'saml20-sp-remote':
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return $entity->getMetadata20SP();
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case 'shib13-idp-remote':
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return $entity->getMetadata1xIdP();
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case 'shib13-sp-remote':
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return $entity->getMetadata1xSP();
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case 'attributeauthority-remote':
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$ret = $entity->getAttributeAuthorities();
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return $ret[0];
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default:
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Logger::warning(__CLASS__.': unknown metadata set: \''.$set.'\'.');
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}
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return null;
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}
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/**
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* Overriding this function from the superclass SimpleSAML_Metadata_MetaDataStorageSource.
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*
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* This function retrieves metadata for the given entity id in the given set of metadata.
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* It will return NULL if it is unable to locate the metadata.
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*
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* This class implements this function using the getMetadataSet-function. A subclass should
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* override this function if it doesn't implement the getMetadataSet function, or if the
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* implementation of getMetadataSet is slow.
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*
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* @param string $index The entityId or metaindex we are looking up.
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* @param string $set The set we are looking for metadata in.
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*
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* @return array An associative array with metadata for the given entity, or NULL if we are unable to
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* locate the entity.
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* @throws \Exception If an error occurs while validating the signature or the metadata is in an
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* incorrect set.
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*/
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public function getMetaData($index, $set)
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{
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assert(is_string($index));
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assert(is_string($set));
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Logger::info(__CLASS__.': loading metadata entity ['.$index.'] from ['.$set.']');
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// read from cache if possible
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try {
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$data = $this->getFromCache($set, $index);
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} catch (\Exception $e) {
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Logger::error($e->getMessage());
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// proceed with fetching metadata even if the cache is broken
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$data = null;
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}
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if ($data !== null && array_key_exists('expires', $data) && $data['expires'] < time()) {
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// metadata has expired
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$data = null;
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}
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if (isset($data)) {
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// metadata found in cache and not expired
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Logger::debug(__CLASS__.': using cached metadata for: '.$index.'.');
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return $data;
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}
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// look at Metadata Query Protocol: https://github.com/iay/md-query/blob/master/draft-young-md-query.txt
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$mdq_url = $this->server.'/entities/'.urlencode($index);
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Logger::debug(__CLASS__.': downloading metadata for "'.$index.'" from ['.$mdq_url.']');
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try {
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$xmldata = HTTP::fetch($mdq_url);
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} catch (\Exception $e) {
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// Avoid propagating the exception, make sure we can handle the error later
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$xmldata = false;
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}
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if (empty($xmldata)) {
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$error = error_get_last();
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Logger::info('Unable to fetch metadata for "'.$index.'" from '.$mdq_url.': '.
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(is_array($error) ? $error['message'] : 'no error available'));
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return null;
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}
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/** @var string $xmldata */
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$entity = \SimpleSAML_Metadata_SAMLParser::parseString($xmldata);
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Logger::debug(__CLASS__.': completed parsing of ['.$mdq_url.']');
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if ($this->validateFingerprint !== null) {
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if (!$entity->validateFingerprint($this->validateFingerprint)) {
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throw new \Exception(__CLASS__.': error, could not verify signature for entity: '.$index.'".');
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}
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}
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$data = self::getParsedSet($entity, $set);
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if ($data === null) {
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throw new \Exception(__CLASS__.': no metadata for set "'.$set.'" available from "'.$index.'".');
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}
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try {
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$this->writeToCache($set, $index, $data);
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} catch (\Exception $e) {
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// Proceed without writing to cache
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Logger::error('Error writing MDQ result to cache: '.$e->getMessage());
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}
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return $data;
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}
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}
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