Merge pull request #11982 from nextcloud/bugfix-stable13/noid/forbid_freebusy_but_allow_local_delivery

[stable13] allow local delivery of schedule message while prohibiting FreeBusy requests 

3 files changed, 138 insertions, 9 deletions

diff --git a/apps/dav/lib/CalDAV/CalendarHome.php b/apps/dav/lib/CalDAV/CalendarHome.php
index 3e645db459f..6700b1b2496 100644
--- a/apps/dav/lib/CalDAV/CalendarHome.php
+++ b/apps/dav/lib/CalDAV/CalendarHome.php
@@ -29,7 +29,6 @@ use Sabre\CalDAV\Backend\NotificationSupport;
 use Sabre\CalDAV\Backend\SchedulingSupport;
 use Sabre\CalDAV\Backend\SubscriptionSupport;
 use Sabre\CalDAV\Schedule\Inbox;
-use Sabre\CalDAV\Schedule\Outbox;
 use Sabre\CalDAV\Subscriptions\Subscription;
 use Sabre\DAV\Exception\NotFound;
 use Sabre\DAV\Exception\MethodNotAllowed;
@@ -81,7 +80,7 @@ class CalendarHome extends \Sabre\CalDAV\CalendarHome {
 
 		if ($this->caldavBackend instanceof SchedulingSupport) {
 			$objects[] = new Inbox($this->caldavBackend, $this->principalInfo['uri']);
-			$objects[] = new Outbox($this->principalInfo['uri']);
+			$objects[] = new Outbox($this->config, $this->principalInfo['uri']);
 		}
 
 		// We're adding a notifications node, if it's supported by the backend.
@@ -108,7 +107,7 @@ class CalendarHome extends \Sabre\CalDAV\CalendarHome {
 			return new Inbox($this->caldavBackend, $this->principalInfo['uri']);
 		}
 		if ($name === 'outbox' && $this->caldavBackend instanceof SchedulingSupport) {
-			return new Outbox($this->principalInfo['uri']);
+			return new Outbox($this->config, $this->principalInfo['uri']);
 		}
 		if ($name === 'notifications' && $this->caldavBackend instanceof NotificationSupport) {
 			return new \Sabre\CalDAv\Notifications\Collection($this->caldavBackend, $this->principalInfo['uri']);
diff --git a/apps/dav/lib/CalDAV/Outbox.php b/apps/dav/lib/CalDAV/Outbox.php
new file mode 100644
index 00000000000..65159343f57
--- /dev/null
+++ b/apps/dav/lib/CalDAV/Outbox.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * @copyright Copyright (c) 2018, Georg Ehrke
+ *
+ * @author Georg Ehrke <oc.list@georgehrke.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\CalDAV;
+
+use OCP\IConfig;
+use Sabre\CalDAV\Plugin as CalDAVPlugin;
+
+/**
+ * Class Outbox
+ *
+ * @package OCA\DAV\CalDAV
+ */
+class Outbox extends \Sabre\CalDAV\Schedule\Outbox {
+
+	/** @var IConfig */
+	private $config;
+
+	/** @var null|bool */
+	private $disableFreeBusy = null;
+
+	/**
+	 * Outbox constructor.
+	 *
+	 * @param IConfig $config
+	 * @param string $principalUri
+	 */
+	public function __construct(IConfig $config, $principalUri) {
+		parent::__construct($principalUri);
+		$this->config = $config;
+	}
+
+	/**
+	 * Returns a list of ACE's for this node.
+	 *
+	 * Each ACE has the following properties:
+	 *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+	 *     currently the only supported privileges
+	 *   * 'principal', a url to the principal who owns the node
+	 *   * 'protected' (optional), indicating that this ACE is not allowed to
+	 *      be updated.
+	 *
+	 * @return array
+	 */
+	function getACL() {
+		// getACL is called so frequently that we cache the config result
+		if ($this->disableFreeBusy === null) {
+			$this->disableFreeBusy = ($this->config->getAppValue('dav', 'disableFreeBusy', 'no') === 'yes');
+		}
+
+		$commonAcl = [
+			[
+				'privilege' => '{DAV:}read',
+				'principal' => $this->getOwner(),
+				'protected' => true,
+			],
+			[
+				'privilege' => '{DAV:}read',
+				'principal' => $this->getOwner() . '/calendar-proxy-read',
+				'protected' => true,
+			],
+			[
+				'privilege' => '{DAV:}read',
+				'principal' => $this->getOwner() . '/calendar-proxy-write',
+				'protected' => true,
+			],
+		];
+
+		// schedule-send is an aggregate privilege for:
+		// - schedule-send-invite
+		// - schedule-send-reply
+		// - schedule-send-freebusy
+		//
+		// If FreeBusy is disabled, we have to remove the latter privilege
+
+		if ($this->disableFreeBusy) {
+			return array_merge($commonAcl, [
+				[
+					'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send-invite',
+					'principal' => $this->getOwner(),
+					'protected' => true,
+				],
+				[
+					'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send-invite',
+					'principal' => $this->getOwner() . '/calendar-proxy-write',
+					'protected' => true,
+				],
+				[
+					'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send-reply',
+					'principal' => $this->getOwner(),
+					'protected' => true,
+				],
+				[
+					'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send-reply',
+					'principal' => $this->getOwner() . '/calendar-proxy-write',
+					'protected' => true,
+				],
+			]);
+		}
+
+		return array_merge($commonAcl, [
+			[
+				'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send',
+				'principal' => $this->getOwner(),
+				'protected' => true,
+			],
+			[
+				'privilege' => '{' . CalDAVPlugin::NS_CALDAV . '}schedule-send',
+				'principal' => $this->getOwner() . '/calendar-proxy-write',
+				'protected' => true,
+			],
+		]);
+	}
+}
diff --git a/apps/dav/lib/Connector/Sabre/Principal.php b/apps/dav/lib/Connector/Sabre/Principal.php
index 18893c9cbe5..c60e63e015e 100644
--- a/apps/dav/lib/Connector/Sabre/Principal.php
+++ b/apps/dav/lib/Connector/Sabre/Principal.php
@@ -213,10 +213,9 @@ class Principal implements BackendInterface {
 	protected function searchUserPrincipals(array $searchProperties, $test = 'allof') {
 		$results = [];
 
-		// If sharing is disabled (or FreeBusy was disabled on purpose), return the empty array
+		// If sharing is disabled, return the empty array
 		$shareAPIEnabled = $this->shareManager->shareApiEnabled();
-		$disableFreeBusy = $this->config->getAppValue('dav', 'disableFreeBusy', $shareAPIEnabled ? 'no' : 'yes');
-		if ($disableFreeBusy === 'yes') {
+		if (!$shareAPIEnabled) {
 			return [];
 		}
 
@@ -299,10 +298,9 @@ class Principal implements BackendInterface {
 	 * @return string
 	 */
 	function findByUri($uri, $principalPrefix) {
-		// If sharing is disabled (or FreeBusy was disabled on purpose), return the empty array
+		// If sharing is disabled, return the empty array
 		$shareAPIEnabled = $this->shareManager->shareApiEnabled();
-		$disableFreeBusy = $this->config->getAppValue('dav', 'disableFreeBusy', $shareAPIEnabled ? 'no' : 'yes');
-		if ($disableFreeBusy === 'yes') {
+		if (!$shareAPIEnabled) {
 			return null;
 		}