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@@ -0,0 +1,221 @@
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+<?php
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+declare(strict_types=1);
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+/**
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+ * @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
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+ *
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+ * @author Roeland Jago Douma <roeland@famdouma.nl>
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+ *
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+ * @license GNU AGPL version 3 or any later version
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU Affero General Public License as
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+ * published by the Free Software Foundation, either version 3 of the
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+ * License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU Affero General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Affero General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+namespace OC\Repair;
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+
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+use Doctrine\DBAL\Driver\Statement;
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+use OCP\AppFramework\Utility\ITimeFactory;
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+use OCP\IConfig;
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+use OCP\IDBConnection;
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+use OCP\IGroupManager;
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+use OCP\Migration\IOutput;
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+use OCP\Migration\IRepairStep;
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+use OCP\Notification\IManager;
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+
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+class RemoveLinkShares implements IRepairStep {
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+ /** @var IDBConnection */
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+ private $connection;
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+ /** @var IConfig */
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+ private $config;
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+ /** @var string[] */
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+ private $userToNotify = [];
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+ /** @var IGroupManager */
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+ private $groupManager;
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+ /** @var IManager */
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+ private $notificationManager;
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+ /** @var ITimeFactory */
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+ private $timeFactory;
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+
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+ public function __construct(IDBConnection $connection,
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+ IConfig $config,
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+ IGroupManager $groupManager,
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+ IManager $notificationManager,
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+ ITimeFactory $timeFactory) {
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+ $this->connection = $connection;
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+ $this->config = $config;
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+ $this->groupManager = $groupManager;
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+ $this->notificationManager = $notificationManager;
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+ $this->timeFactory = $timeFactory;
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+ }
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+
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+
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+ public function getName(): string {
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+ return 'Remove potentially over exposing share links';
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+ }
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+
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+ private function shouldRun(): bool {
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+ $versionFromBeforeUpdate = $this->config->getSystemValue('version', '0.0.0');
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+
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+ if (version_compare($versionFromBeforeUpdate, '14.0.11', '<')) {
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+ return true;
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+ }
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+ if (version_compare($versionFromBeforeUpdate, '15.0.8', '<')) {
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+ return true;
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+ }
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+ if (version_compare($versionFromBeforeUpdate, '16.0.0', '<=')) {
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+ return true;
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+ }
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+
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+ return false;
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+ }
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+
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+ /**
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+ * Delete the share
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+ *
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+ * @param int $id
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+ */
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+ private function deleteShare(int $id) {
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+ $qb = $this->connection->getQueryBuilder();
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+ $qb->delete('share')
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+ ->where($qb->expr()->eq('id', $qb->createNamedParameter($id)));
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+ $qb->execute();
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+ }
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+
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+ /**
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+ * Get the total of affected shares
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+ *
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+ * @return int
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+ */
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+ private function getTotal(): int {
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+ $sql = 'SELECT COUNT(*) AS `total`
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+ FROM `*PREFIX*share`
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+ WHERE `id` IN (
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+ SELECT `s1`.`id`
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+ FROM (
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+ SELECT *
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+ FROM `*PREFIX*share`
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+ WHERE `parent` IS NOT NULL
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+ AND `share_type` = 3
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+ ) AS s1
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+ JOIN `*PREFIX*share` AS s2
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+ ON `s1`.`parent` = `s2`.`id`
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+ WHERE (`s2`.`share_type` = 1 OR `s2`.`share_type` = 2)
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+ AND `s1`.`item_source` = `s2`.`item_source`
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+ )';
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+ $cursor = $this->connection->executeQuery($sql);
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+ $data = $cursor->fetchAll();
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+ $total = (int)$data[0]['total'];
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+ $cursor->closeCursor();
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+
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+ return $total;
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+ }
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+
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+ /**
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+ * Get the cursor to fetch all the shares
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+ *
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+ * @return \Doctrine\DBAL\Driver\Statement
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+ */
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+ private function getShares(): Statement {
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+ $sql = 'SELECT `s1`.`id`, `s1`.`uid_owner`, `s1`.`uid_initiator`
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+ FROM (
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+ SELECT *
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+ FROM `*PREFIX*share`
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+ WHERE `parent` IS NOT NULL
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+ AND `share_type` = 3
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+ ) AS s1
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+ JOIN `*PREFIX*share` AS s2
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+ ON `s1`.`parent` = `s2`.`id`
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+ WHERE (`s2`.`share_type` = 1 OR `s2`.`share_type` = 2)
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+ AND `s1`.`item_source` = `s2`.`item_source`';
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+ $cursor = $this->connection->executeQuery($sql);
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+ return $cursor;
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+ }
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+
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+ /**
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+ * Process a single share
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+ *
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+ * @param array $data
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+ */
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+ private function processShare(array $data) {
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+ $id = $data['id'];
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+
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+ $this->addToNotify($data['uid_owner']);
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+ $this->addToNotify($data['uid_initiator']);
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+
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+ $this->deleteShare((int)$id);
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+ }
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+
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+ /**
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+ * Update list of users to notify
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+ *
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+ * @param string $uid
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+ */
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+ private function addToNotify(string $uid) {
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+ if (!isset($this->userToNotify[$uid])) {
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+ $this->userToNotify[$uid] = true;
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+ }
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+ }
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+
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+ /**
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+ * Send all notifications
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+ */
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+ private function sendNotification() {
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+ $time = $this->timeFactory->getDateTime();
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+
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+ $notification = $this->notificationManager->createNotification();
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+ $notification->setApp('core')
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+ ->setDateTime($time)
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+ ->setObject('repair', 'exposing_links')
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+ ->setSubject('repair_exposing_links', []);
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+
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+ $users = array_keys($this->userToNotify);
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+ foreach ($users as $user) {
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+ $notification->setUser($user);
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+ $this->notificationManager->notify($notification);
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+ }
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+ }
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+
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+ private function repair(IOutput $output) {
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+ $total = $this->getTotal();
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+ $output->startProgress($total);
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+
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+ $shareCursor = $this->getShares();
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+ while($data = $shareCursor->fetch()) {
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+ $this->processShare($data);
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+ $output->advance();
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+ }
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+ $output->finishProgress();
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+ $shareCursor->closeCursor();
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+
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+ // Notifiy all admins
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+ $adminGroup = $this->groupManager->get('admin');
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+ $adminUsers = $adminGroup->getUsers();
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+ foreach ($adminUsers as $user) {
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+ $this->addToNotify($user->getUID());
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+ }
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+
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+ $output->info('Sending notifications to admins and affected users');
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+ $this->sendNotification();
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+ }
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+
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+ public function run(IOutput $output) {
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+ if ($this->shouldRun()) {
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+ $output->info('Removing potentially over exposing link shares');
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+ $this->repair($output);
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+ $output->info('Removed potentially over exposing link shares');
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+ } else {
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+ $output->info('No need to remove link shares.');
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+ }
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+ }
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+}
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Roeland Jago Douma