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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Acl\Dbal;
use Doctrine\DBAL\Driver\Connection;
use Doctrine\DBAL\Driver\Statement;
use Symfony\Component\Security\Acl\Model\AclInterface;
use Symfony\Component\Security\Acl\Domain\Acl;
use Symfony\Component\Security\Acl\Domain\Entry;
use Symfony\Component\Security\Acl\Domain\FieldEntry;
use Symfony\Component\Security\Acl\Domain\ObjectIdentity;
use Symfony\Component\Security\Acl\Domain\RoleSecurityIdentity;
use Symfony\Component\Security\Acl\Domain\UserSecurityIdentity;
use Symfony\Component\Security\Acl\Exception\AclNotFoundException;
use Symfony\Component\Security\Acl\Exception\NotAllAclsFoundException;
use Symfony\Component\Security\Acl\Model\AclCacheInterface;
use Symfony\Component\Security\Acl\Model\AclProviderInterface;
use Symfony\Component\Security\Acl\Model\ObjectIdentityInterface;
use Symfony\Component\Security\Acl\Model\PermissionGrantingStrategyInterface;
/**
* An ACL provider implementation.
*
* This provider assumes that all ACLs share the same PermissionGrantingStrategy.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class AclProvider implements AclProviderInterface
{
const MAX_BATCH_SIZE = 30;
protected $cache;
protected $connection;
protected $loadedAces = array();
protected $loadedAcls = array();
protected $options;
private $permissionGrantingStrategy;
/**
* Constructor.
*
* @param Connection $connection
* @param PermissionGrantingStrategyInterface $permissionGrantingStrategy
* @param array $options
* @param AclCacheInterface $cache
*/
public function __construct(Connection $connection, PermissionGrantingStrategyInterface $permissionGrantingStrategy, array $options, AclCacheInterface $cache = null)
{
$this->cache = $cache;
$this->connection = $connection;
$this->options = $options;
$this->permissionGrantingStrategy = $permissionGrantingStrategy;
}
/**
* {@inheritDoc}
*/
public function findChildren(ObjectIdentityInterface $parentOid, $directChildrenOnly = false)
{
$sql = $this->getFindChildrenSql($parentOid, $directChildrenOnly);
$children = array();
foreach ($this->connection->executeQuery($sql)->fetchAll() as $data) {
$children[] = new ObjectIdentity($data['object_identifier'], $data['class_type']);
}
return $children;
}
/**
* {@inheritDoc}
*/
public function findAcl(ObjectIdentityInterface $oid, array $sids = array())
{
return $this->findAcls(array($oid), $sids)->offsetGet($oid);
}
/**
* {@inheritDoc}
*/
public function findAcls(array $oids, array $sids = array())
{
$result = new \SplObjectStorage();
$currentBatch = array();
$oidLookup = array();
for ($i=0,$c=count($oids); $i<$c; $i++) {
$oid = $oids[$i];
$oidLookupKey = $oid->getIdentifier().$oid->getType();
$oidLookup[$oidLookupKey] = $oid;
$aclFound = false;
// check if result already contains an ACL
if ($result->contains($oid)) {
$aclFound = true;
}
// check if this ACL has already been hydrated
if (!$aclFound && isset($this->loadedAcls[$oid->getType()][$oid->getIdentifier()])) {
$acl = $this->loadedAcls[$oid->getType()][$oid->getIdentifier()];
if (!$acl->isSidLoaded($sids)) {
// FIXME: we need to load ACEs for the missing SIDs. This is never
// reached by the default implementation, since we do not
// filter by SID
throw new \RuntimeException('This is not supported by the default implementation.');
} else {
$result->attach($oid, $acl);
$aclFound = true;
}
}
// check if we can locate the ACL in the cache
if (!$aclFound && null !== $this->cache) {
$acl = $this->cache->getFromCacheByIdentity($oid);
if (null !== $acl) {
if ($acl->isSidLoaded($sids)) {
// check if any of the parents has been loaded since we need to
// ensure that there is only ever one ACL per object identity
$parentAcl = $acl->getParentAcl();
while (null !== $parentAcl) {
$parentOid = $parentAcl->getObjectIdentity();
if (isset($this->loadedAcls[$parentOid->getType()][$parentOid->getIdentifier()])) {
$acl->setParentAcl($this->loadedAcls[$parentOid->getType()][$parentOid->getIdentifier()]);
break;
} else {
$this->loadedAcls[$parentOid->getType()][$parentOid->getIdentifier()] = $parentAcl;
$this->updateAceIdentityMap($parentAcl);
}
$parentAcl = $parentAcl->getParentAcl();
}
$this->loadedAcls[$oid->getType()][$oid->getIdentifier()] = $acl;
$this->updateAceIdentityMap($acl);
$result->attach($oid, $acl);
$aclFound = true;
} else {
$this->cache->evictFromCacheByIdentity($oid);
foreach ($this->findChildren($oid) as $childOid) {
$this->cache->evictFromCacheByIdentity($childOid);
}
}
}
}
// looks like we have to load the ACL from the database
if (!$aclFound) {
$currentBatch[] = $oid;
}
// Is it time to load the current batch?
if ((self::MAX_BATCH_SIZE === count($currentBatch) || ($i + 1) === $c) && count($currentBatch) > 0) {
try {
$loadedBatch = $this->lookupObjectIdentities($currentBatch, $sids, $oidLookup);
} catch (AclNotFoundException $aclNotFoundexception) {
if ($result->count()) {
$partialResultException = new NotAllAclsFoundException('The provider could not find ACLs for all object identities.');
$partialResultException->setPartialResult($result);
throw $partialResultException;
} else {
throw $aclNotFoundexception;
}
}
foreach ($loadedBatch as $loadedOid) {
$loadedAcl = $loadedBatch->offsetGet($loadedOid);
if (null !== $this->cache) {
$this->cache->putInCache($loadedAcl);
}
if (isset($oidLookup[$loadedOid->getIdentifier().$loadedOid->getType()])) {
$result->attach($loadedOid, $loadedAcl);
}
}
$currentBatch = array();
}
}
// check that we got ACLs for all the identities
foreach ($oids as $oid) {
if (!$result->contains($oid)) {
if (1 === count($oids)) {
throw new AclNotFoundException(sprintf('No ACL found for %s.', $oid));
}
$partialResultException = new NotAllAclsFoundException('The provider could not find ACLs for all object identities.');
$partialResultException->setPartialResult($result);
throw $partialResultException;
}
}
return $result;
}
/**
* Constructs the query used for looking up object identities and associated
* ACEs, and security identities.
*
* @param array $ancestorIds
* @return string
*/
protected function getLookupSql(array $ancestorIds)
{
// FIXME: add support for filtering by sids (right now we select all sids)
$sql = <<<SELECTCLAUSE
SELECT
o.id as acl_id,
o.object_identifier,
o.parent_object_identity_id,
o.entries_inheriting,
c.class_type,
e.id as ace_id,
e.object_identity_id,
e.field_name,
e.ace_order,
e.mask,
e.granting,
e.granting_strategy,
e.audit_success,
e.audit_failure,
s.username,
s.identifier as security_identifier
FROM
{$this->options['oid_table_name']} o
INNER JOIN {$this->options['class_table_name']} c ON c.id = o.class_id
LEFT JOIN {$this->options['entry_table_name']} e ON (
e.class_id = o.class_id AND (e.object_identity_id = o.id OR {$this->connection->getDatabasePlatform()->getIsNullExpression('e.object_identity_id')})
)
LEFT JOIN {$this->options['sid_table_name']} s ON (
s.id = e.security_identity_id
)
WHERE (o.id =
SELECTCLAUSE;
$sql .= implode(' OR o.id = ', $ancestorIds).')';
return $sql;
}
protected function getAncestorLookupSql(array $batch)
{
$sql = <<<SELECTCLAUSE
SELECT a.ancestor_id
FROM
{$this->options['oid_table_name']} o
INNER JOIN {$this->options['class_table_name']} c ON c.id = o.class_id
INNER JOIN {$this->options['oid_ancestors_table_name']} a ON a.object_identity_id = o.id
WHERE (
SELECTCLAUSE;
$types = array();
$count = count($batch);
for ($i = 0; $i < $count; $i++) {
if (!isset($types[$batch[$i]->getType()])) {
$types[$batch[$i]->getType()] = true;
// if there is more than one type we can safely break out of the
// loop, because it is the differentiator factor on whether to
// query for only one or more class types
if (count($types) > 1) {
break;
}
}
}
if (1 === count($types)) {
$ids = array();
for ($i = 0; $i < $count; $i++) {
$ids[] = $this->connection->quote($batch[$i]->getIdentifier());
}
$sql .= sprintf(
'(o.object_identifier IN (%s) AND c.class_type = %s)',
implode(',', $ids),
$this->connection->quote($batch[0]->getType())
);
} else {
$where = '(o.object_identifier = %s AND c.class_type = %s)';
for ($i = 0; $i < $count; $i++) {
$sql .= sprintf(
$where,
$this->connection->quote($batch[$i]->getIdentifier()),
$this->connection->quote($batch[$i]->getType())
);
if ($i+1 < $count) {
$sql .= ' OR ';
}
}
}
$sql .= ')';
return $sql;
}
/**
* Constructs the SQL for retrieving child object identities for the given
* object identities.
*
* @param ObjectIdentityInterface $oid
* @param Boolean $directChildrenOnly
* @return string
*/
protected function getFindChildrenSql(ObjectIdentityInterface $oid, $directChildrenOnly)
{
if (false === $directChildrenOnly) {
$query = <<<FINDCHILDREN
SELECT o.object_identifier, c.class_type
FROM
{$this->options['oid_table_name']} as o
INNER JOIN {$this->options['class_table_name']} as c ON c.id = o.class_id
INNER JOIN {$this->options['oid_ancestors_table_name']} as a ON a.object_identity_id = o.id
WHERE
a.ancestor_id = %d AND a.object_identity_id != a.ancestor_id
FINDCHILDREN;
} else {
$query = <<<FINDCHILDREN
SELECT o.object_identifier, c.class_type
FROM {$this->options['oid_table_name']} as o
INNER JOIN {$this->options['class_table_name']} as c ON c.id = o.class_id
WHERE o.parent_object_identity_id = %d
FINDCHILDREN;
}
return sprintf($query, $this->retrieveObjectIdentityPrimaryKey($oid));
}
/**
* Constructs the SQL for retrieving the primary key of the given object
* identity.
*
* @param ObjectIdentityInterface $oid
* @return string
*/
protected function getSelectObjectIdentityIdSql(ObjectIdentityInterface $oid)
{
$query = <<<QUERY
SELECT o.id
FROM %s o
INNER JOIN %s c ON c.id = o.class_id
WHERE o.object_identifier = %s AND c.class_type = %s
QUERY;
return sprintf(
$query,
$this->options['oid_table_name'],
$this->options['class_table_name'],
$this->connection->quote($oid->getIdentifier()),
$this->connection->quote($oid->getType())
);
}
/**
* Returns the primary key of the passed object identity.
*
* @param ObjectIdentityInterface $oid
* @return integer
*/
final protected function retrieveObjectIdentityPrimaryKey(ObjectIdentityInterface $oid)
{
return $this->connection->executeQuery($this->getSelectObjectIdentityIdSql($oid))->fetchColumn();
}
/**
* This method is called when an ACL instance is retrieved from the cache.
*
* @param AclInterface $acl
*/
private function updateAceIdentityMap(AclInterface $acl)
{
foreach (array('classAces', 'classFieldAces', 'objectAces', 'objectFieldAces') as $property) {
$reflection = new \ReflectionProperty($acl, $property);
$reflection->setAccessible(true);
$value = $reflection->getValue($acl);
if ('classAces' === $property || 'objectAces' === $property) {
$this->doUpdateAceIdentityMap($value);
} else {
foreach ($value as $field => $aces) {
$this->doUpdateAceIdentityMap($value[$field]);
}
}
$reflection->setValue($acl, $value);
$reflection->setAccessible(false);
}
}
/**
* Retrieves all the ids which need to be queried from the database
* including the ids of parent ACLs.
*
* @param array $batch
*
* @return array
*/
private function getAncestorIds(array $batch)
{
$sql = $this->getAncestorLookupSql($batch);
$ancestorIds = array();
foreach ($this->connection->executeQuery($sql)->fetchAll() as $data) {
// FIXME: skip ancestors which are cached
$ancestorIds[] = $data['ancestor_id'];
}
return $ancestorIds;
}
/**
* Does either overwrite the passed ACE, or saves it in the global identity
* map to ensure every ACE only gets instantiated once.
*
* @param array &$aces
*/
private function doUpdateAceIdentityMap(array &$aces)
{
foreach ($aces as $index => $ace) {
if (isset($this->loadedAces[$ace->getId()])) {
$aces[$index] = $this->loadedAces[$ace->getId()];
} else {
$this->loadedAces[$ace->getId()] = $ace;
}
}
}
/**
* This method is called for object identities which could not be retrieved
* from the cache, and for which thus a database query is required.
*
* @param array $batch
* @param array $sids
* @param array $oidLookup
*
* @return \SplObjectStorage mapping object identities to ACL instances
*
* @throws AclNotFoundException
*/
private function lookupObjectIdentities(array $batch, array $sids, array $oidLookup)
{
$ancestorIds = $this->getAncestorIds($batch);
if (!$ancestorIds) {
throw new AclNotFoundException('There is no ACL for the given object identity.');
}
$sql = $this->getLookupSql($ancestorIds);
$stmt = $this->connection->executeQuery($sql);
return $this->hydrateObjectIdentities($stmt, $oidLookup, $sids);
}
/**
* This method is called to hydrate ACLs and ACEs.
*
* This method was designed for performance; thus, a lot of code has been
* inlined at the cost of readability, and maintainability.
*
* Keep in mind that changes to this method might severely reduce the
* performance of the entire ACL system.
*
* @param Statement $stmt
* @param array $oidLookup
* @param array $sids
* @throws \RuntimeException
* @return \SplObjectStorage
*/
private function hydrateObjectIdentities(Statement $stmt, array $oidLookup, array $sids)
{
$parentIdToFill = new \SplObjectStorage();
$acls = $aces = $emptyArray = array();
$oidCache = $oidLookup;
$result = new \SplObjectStorage();
$loadedAces =& $this->loadedAces;
$loadedAcls =& $this->loadedAcls;
$permissionGrantingStrategy = $this->permissionGrantingStrategy;
// we need these to set protected properties on hydrated objects
$aclReflection = new \ReflectionClass('Symfony\Component\Security\Acl\Domain\Acl');
$aclClassAcesProperty = $aclReflection->getProperty('classAces');
$aclClassAcesProperty->setAccessible(true);
$aclClassFieldAcesProperty = $aclReflection->getProperty('classFieldAces');
$aclClassFieldAcesProperty->setAccessible(true);
$aclObjectAcesProperty = $aclReflection->getProperty('objectAces');
$aclObjectAcesProperty->setAccessible(true);
$aclObjectFieldAcesProperty = $aclReflection->getProperty('objectFieldAces');
$aclObjectFieldAcesProperty->setAccessible(true);
$aclParentAclProperty = $aclReflection->getProperty('parentAcl');
$aclParentAclProperty->setAccessible(true);
// fetchAll() consumes more memory than consecutive calls to fetch(),
// but it is faster
foreach ($stmt->fetchAll(\PDO::FETCH_NUM) as $data) {
list($aclId,
$objectIdentifier,
$parentObjectIdentityId,
$entriesInheriting,
$classType,
$aceId,
$objectIdentityId,
$fieldName,
$aceOrder,
$mask,
$granting,
$grantingStrategy,
$auditSuccess,
$auditFailure,
$username,
$securityIdentifier) = $data;
// has the ACL been hydrated during this hydration cycle?
if (isset($acls[$aclId])) {
$acl = $acls[$aclId];
// has the ACL been hydrated during any previous cycle, or was possibly loaded
// from cache?
} elseif (isset($loadedAcls[$classType][$objectIdentifier])) {
$acl = $loadedAcls[$classType][$objectIdentifier];
// keep reference in local array (saves us some hash calculations)
$acls[$aclId] = $acl;
// attach ACL to the result set; even though we do not enforce that every
// object identity has only one instance, we must make sure to maintain
// referential equality with the oids passed to findAcls()
if (!isset($oidCache[$objectIdentifier.$classType])) {
$oidCache[$objectIdentifier.$classType] = $acl->getObjectIdentity();
}
$result->attach($oidCache[$objectIdentifier.$classType], $acl);
// so, this hasn't been hydrated yet
} else {
// create object identity if we haven't done so yet
$oidLookupKey = $objectIdentifier.$classType;
if (!isset($oidCache[$oidLookupKey])) {
$oidCache[$oidLookupKey] = new ObjectIdentity($objectIdentifier, $classType);
}
$acl = new Acl((integer) $aclId, $oidCache[$oidLookupKey], $permissionGrantingStrategy, $emptyArray, !!$entriesInheriting);
// keep a local, and global reference to this ACL
$loadedAcls[$classType][$objectIdentifier] = $acl;
$acls[$aclId] = $acl;
// try to fill in parent ACL, or defer until all ACLs have been hydrated
if (null !== $parentObjectIdentityId) {
if (isset($acls[$parentObjectIdentityId])) {
$aclParentAclProperty->setValue($acl, $acls[$parentObjectIdentityId]);
} else {
$parentIdToFill->attach($acl, $parentObjectIdentityId);
}
}
$result->attach($oidCache[$oidLookupKey], $acl);
}
// check if this row contains an ACE record
if (null !== $aceId) {
// have we already hydrated ACEs for this ACL?
if (!isset($aces[$aclId])) {
$aces[$aclId] = array($emptyArray, $emptyArray, $emptyArray, $emptyArray);
}
// has this ACE already been hydrated during a previous cycle, or
// possible been loaded from cache?
// It is important to only ever have one ACE instance per actual row since
// some ACEs are shared between ACL instances
if (!isset($loadedAces[$aceId])) {
if (!isset($sids[$key = ($username?'1':'0').$securityIdentifier])) {
if ($username) {
$sids[$key] = new UserSecurityIdentity(
substr($securityIdentifier, 1 + $pos = strpos($securityIdentifier, '-')),
substr($securityIdentifier, 0, $pos)
);
} else {
$sids[$key] = new RoleSecurityIdentity($securityIdentifier);
}
}
if (null === $fieldName) {
$loadedAces[$aceId] = new Entry((integer) $aceId, $acl, $sids[$key], $grantingStrategy, (integer) $mask, !!$granting, !!$auditFailure, !!$auditSuccess);
} else {
$loadedAces[$aceId] = new FieldEntry((integer) $aceId, $acl, $fieldName, $sids[$key], $grantingStrategy, (integer) $mask, !!$granting, !!$auditFailure, !!$auditSuccess);
}
}
$ace = $loadedAces[$aceId];
// assign ACE to the correct property
if (null === $objectIdentityId) {
if (null === $fieldName) {
$aces[$aclId][0][$aceOrder] = $ace;
} else {
$aces[$aclId][1][$fieldName][$aceOrder] = $ace;
}
} else {
if (null === $fieldName) {
$aces[$aclId][2][$aceOrder] = $ace;
} else {
$aces[$aclId][3][$fieldName][$aceOrder] = $ace;
}
}
}
}
// We do not sort on database level since we only want certain subsets to be sorted,
// and we are going to read the entire result set anyway.
// Sorting on DB level increases query time by an order of magnitude while it is
// almost negligible when we use PHPs array sort functions.
foreach ($aces as $aclId => $aceData) {
$acl = $acls[$aclId];
ksort($aceData[0]);
$aclClassAcesProperty->setValue($acl, $aceData[0]);
foreach (array_keys($aceData[1]) as $fieldName) {
ksort($aceData[1][$fieldName]);
}
$aclClassFieldAcesProperty->setValue($acl, $aceData[1]);
ksort($aceData[2]);
$aclObjectAcesProperty->setValue($acl, $aceData[2]);
foreach (array_keys($aceData[3]) as $fieldName) {
ksort($aceData[3][$fieldName]);
}
$aclObjectFieldAcesProperty->setValue($acl, $aceData[3]);
}
// fill-in parent ACLs where this hasn't been done yet cause the parent ACL was not
// yet available
$processed = 0;
foreach ($parentIdToFill as $acl) {
$parentId = $parentIdToFill->offsetGet($acl);
// let's see if we have already hydrated this
if (isset($acls[$parentId])) {
$aclParentAclProperty->setValue($acl, $acls[$parentId]);
$processed += 1;
continue;
}
}
// reset reflection changes
$aclClassAcesProperty->setAccessible(false);
$aclClassFieldAcesProperty->setAccessible(false);
$aclObjectAcesProperty->setAccessible(false);
$aclObjectFieldAcesProperty->setAccessible(false);
$aclParentAclProperty->setAccessible(false);
// this should never be true if the database integrity hasn't been compromised
if ($processed < count($parentIdToFill)) {
throw new \RuntimeException('Not all parent ids were populated. This implies an integrity problem.');
}
return $result;
}
}
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