<?php
namespace SimpleSAML\Metadata;
/**
* This abstract class defines an interface for metadata storage sources.
*
* It also contains the overview of the different metadata storage sources.
* A metadata storage source can be loaded by passing the configuration of it
* to the getSource static function.
*
* @author Olav Morken, UNINETT AS.
* @author Andreas Aakre Solberg, UNINETT AS.
* @package SimpleSAMLphp
*/
abstract class MetaDataStorageSource
{
/**
* Parse array with metadata sources.
*
* This function accepts an array with metadata sources, and returns an array with
* each metadata source as an object.
*
* @param array $sourcesConfig Array with metadata source configuration.
*
* @return array Parsed metadata configuration.
*
* @throws \Exception If something is wrong in the configuration.
*/
public static function parseSources($sourcesConfig)
{
assert(is_array($sourcesConfig));
$sources = [];
foreach ($sourcesConfig as $sourceConfig) {
if (!is_array($sourceConfig)) {
throw new \Exception("Found an element in metadata source configuration which wasn't an array.");
}
$sources[] = self::getSource($sourceConfig);
}
return $sources;
}
/**
* This function creates a metadata source based on the given configuration.
* The type of source is based on the 'type' parameter in the configuration.
* The default type is 'flatfile'.
*
* @param array $sourceConfig Associative array with the configuration for this metadata source.
*
* @return mixed An instance of a metadata source with the given configuration.
*
* @throws \Exception If the metadata source type is invalid.
*/
public static function getSource($sourceConfig)
{
assert(is_array($sourceConfig));
if (array_key_exists('type', $sourceConfig)) {
$type = $sourceConfig['type'];
} else {
$type = 'flatfile';
}
switch ($type) {
case 'flatfile':
return new MetaDataStorageHandlerFlatFile($sourceConfig);
case 'xml':
return new MetaDataStorageHandlerXML($sourceConfig);
case 'serialize':
return new MetaDataStorageHandlerSerialize($sourceConfig);
case 'mdx':
case 'mdq':
return new Sources\MDQ($sourceConfig);
case 'pdo':
return new MetaDataStorageHandlerPdo($sourceConfig);
default:
// metadata store from module
try {
$className = \SimpleSAML\Module::resolveClass(
$type,
'MetadataStore',
'\SimpleSAML\Metadata\MetaDataStorageSource'
);
} catch (\Exception $e) {
throw new \SimpleSAML\Error\CriticalConfigurationError(
"Invalid 'type' for metadata source. Cannot find store '$type'.",
null
);
}
return new $className($sourceConfig);
}
}
/**
* This function attempts to generate an associative array with metadata for all entities in the
* given set. The key of the array is the entity id.
*
* A subclass should override this function if it is able to easily generate this list.
*
* @param string $set The set we want to list metadata for.
*
* @return array An associative array with all entities in the given set, or an empty array if we are
* unable to generate this list.
*/
public function getMetadataSet($set)
{
return [];
}
/**
* This function resolves an host/path combination to an entity id.
*
* This class implements this function using the getMetadataSet-function. A subclass should
* override this function if it doesn't implement the getMetadataSet function, or if the
* implementation of getMetadataSet is slow.
*
* @param string $hostPath The host/path combination we are looking up.
* @param string $set Which set of metadata we are looking it up in.
* @param string $type Do you want to return the metaindex or the entityID. [entityid|metaindex]
*
* @return string|null An entity id which matches the given host/path combination, or NULL if
* we are unable to locate one which matches.
*/
public function getEntityIdFromHostPath($hostPath, $set, $type = 'entityid')
{
$metadataSet = $this->getMetadataSet($set);
if ($metadataSet === null) {
// this metadata source does not have this metadata set
return null;
}
foreach ($metadataSet as $index => $entry) {
if (!array_key_exists('host', $entry)) {
continue;
}
if ($hostPath === $entry['host']) {
if ($type === 'entityid') {
return $entry['entityid'];
} else {
return $index;
}
}
}
// no entries matched, we should return null
return null;
}
/**
* This function will go through all the metadata, and check the DiscoHints->IPHint
* parameter, which defines a network space (ip range) for each remote entry.
* This function returns the entityID for any of the entities that have an
* IP range which the IP falls within.
*
* @param string $set Which set of metadata we are looking it up in.
* @param string $ip IP address
* @param string $type Do you want to return the metaindex or the entityID. [entityid|metaindex]
*
* @return string The entity id of a entity which have a CIDR hint where the provided
* IP address match.
*/
public function getPreferredEntityIdFromCIDRhint($set, $ip, $type = 'entityid')
{
$metadataSet = $this->getMetadataSet($set);
foreach ($metadataSet as $index => $entry) {
$cidrHints = [];
// support hint.cidr for idp discovery
if (array_key_exists('hint.cidr', $entry) && is_array($entry['hint.cidr'])) {
$cidrHints = $entry['hint.cidr'];
}
// support discohints in idp metadata for idp discovery
if (array_key_exists('DiscoHints', $entry)
&& array_key_exists('IPHint', $entry['DiscoHints'])
&& is_array($entry['DiscoHints']['IPHint'])) {
// merge with hints derived from discohints, but prioritize hint.cidr in case it is used
$cidrHints = array_merge($entry['DiscoHints']['IPHint'], $cidrHints);
}
if (empty($cidrHints)) {
continue;
}
foreach ($cidrHints as $hint_entry) {
if (\SimpleSAML\Utils\Net::ipCIDRcheck($hint_entry, $ip)) {
if ($type === 'entityid') {
return $entry['entityid'];
} else {
return $index;
}
}
}
}
// no entries matched, we should return null
return null;
}
/*
*
*/
private function lookupIndexFromEntityId($entityId, $set)
{
assert(is_string($entityId));
assert(isset($set));
$metadataSet = $this->getMetadataSet($set);
// check for hostname
$currenthost = \SimpleSAML\Utils\HTTP::getSelfHost(); // sp.example.org
foreach ($metadataSet as $index => $entry) {
if ($index === $entityId) {
return $index;
}
if ($entry['entityid'] === $entityId) {
if ($entry['host'] === '__DEFAULT__' || $entry['host'] === $currenthost) {
return $index;
}
}
}
return null;
}
/**
* This function retrieves metadata for the given entity id in the given set of metadata.
* It will return NULL if it is unable to locate the metadata.
*
* This class implements this function using the getMetadataSet-function. A subclass should
* override this function if it doesn't implement the getMetadataSet function, or if the
* implementation of getMetadataSet is slow.
*
* @param string $index The entityId or metaindex we are looking up.
* @param string $set The set we are looking for metadata in.
*
* @return array An associative array with metadata for the given entity, or NULL if we are unable to
* locate the entity.
*/
public function getMetaData($index, $set)
{
assert(is_string($index));
assert(isset($set));
$metadataSet = $this->getMetadataSet($set);
if (array_key_exists($index, $metadataSet)) {
return $metadataSet[$index];
}
$indexlookup = $this->lookupIndexFromEntityId($index, $set);
if (isset($indexlookup) && array_key_exists($indexlookup, $metadataSet)) {
return $metadataSet[$indexlookup];
}
return null;
}
}