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diff --git a/apps/dav/lib/Connector/Sabre/Principal.php b/apps/dav/lib/Connector/Sabre/Principal.php
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+++ b/apps/dav/lib/Connector/Sabre/Principal.php
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+<?php
+/**
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Jakob Sack <mail@jakobsack.de>
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ * @author Thomas Tanghus <thomas@tanghus.net>
+ * @author Vincent Petry <pvince81@owncloud.com>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @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\Connector\Sabre;
+
+use OCP\IGroup;
+use OCP\IGroupManager;
+use OCP\IUser;
+use OCP\IUserManager;
+use Sabre\DAV\Exception;
+use \Sabre\DAV\PropPatch;
+use Sabre\DAVACL\PrincipalBackend\BackendInterface;
+use Sabre\HTTP\URLUtil;
+
+class Principal implements BackendInterface {
+
+	/** @var IUserManager */
+	private $userManager;
+
+	/** @var IGroupManager */
+	private $groupManager;
+
+	/** @var string */
+	private $principalPrefix;
+
+	/** @var bool */
+	private $hasGroups;
+
+	/**
+	 * @param IUserManager $userManager
+	 * @param IGroupManager $groupManager
+	 * @param string $principalPrefix
+	 */
+	public function __construct(IUserManager $userManager,
+								IGroupManager $groupManager,
+								$principalPrefix = 'principals/users/') {
+		$this->userManager = $userManager;
+		$this->groupManager = $groupManager;
+		$this->principalPrefix = trim($principalPrefix, '/');
+		$this->hasGroups = ($principalPrefix === 'principals/users/');
+	}
+
+	/**
+	 * Returns a list of principals based on a prefix.
+	 *
+	 * This prefix will often contain something like 'principals'. You are only
+	 * expected to return principals that are in this base path.
+	 *
+	 * You are expected to return at least a 'uri' for every user, you can
+	 * return any additional properties if you wish so. Common properties are:
+	 *   {DAV:}displayname
+	 *
+	 * @param string $prefixPath
+	 * @return string[]
+	 */
+	public function getPrincipalsByPrefix($prefixPath) {
+		$principals = [];
+
+		if ($prefixPath === $this->principalPrefix) {
+			foreach($this->userManager->search('') as $user) {
+				$principals[] = $this->userToPrincipal($user);
+			}
+		}
+
+		return $principals;
+	}
+
+	/**
+	 * Returns a specific principal, specified by it's path.
+	 * The returned structure should be the exact same as from
+	 * getPrincipalsByPrefix.
+	 *
+	 * @param string $path
+	 * @return array
+	 */
+	public function getPrincipalByPath($path) {
+		list($prefix, $name) = URLUtil::splitPath($path);
+
+		if ($prefix === $this->principalPrefix) {
+			$user = $this->userManager->get($name);
+
+			if (!is_null($user)) {
+				return $this->userToPrincipal($user);
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Returns the list of members for a group-principal
+	 *
+	 * @param string $principal
+	 * @return string[]
+	 * @throws Exception
+	 */
+	public function getGroupMemberSet($principal) {
+		// TODO: for now the group principal has only one member, the user itself
+		$principal = $this->getPrincipalByPath($principal);
+		if (!$principal) {
+			throw new Exception('Principal not found');
+		}
+
+		return [$principal['uri']];
+	}
+
+	/**
+	 * Returns the list of groups a principal is a member of
+	 *
+	 * @param string $principal
+	 * @param bool $needGroups
+	 * @return array
+	 * @throws Exception
+	 */
+	public function getGroupMembership($principal, $needGroups = false) {
+		list($prefix, $name) = URLUtil::splitPath($principal);
+
+		if ($prefix === $this->principalPrefix) {
+			$user = $this->userManager->get($name);
+			if (!$user) {
+				throw new Exception('Principal not found');
+			}
+
+			if ($this->hasGroups || $needGroups) {
+				$groups = $this->groupManager->getUserGroups($user);
+				$groups = array_map(function($group) {
+					/** @var IGroup $group */
+					return 'principals/groups/' . $group->getGID();
+				}, $groups);
+
+				return $groups;
+			}
+		}
+		return [];
+	}
+
+	/**
+	 * Updates the list of group members for a group principal.
+	 *
+	 * The principals should be passed as a list of uri's.
+	 *
+	 * @param string $principal
+	 * @param string[] $members
+	 * @throws Exception
+	 */
+	public function setGroupMemberSet($principal, array $members) {
+		throw new Exception('Setting members of the group is not supported yet');
+	}
+
+	/**
+	 * @param string $path
+	 * @param PropPatch $propPatch
+	 * @return int
+	 */
+	function updatePrincipal($path, PropPatch $propPatch) {
+		return 0;
+	}
+
+	/**
+	 * @param string $prefixPath
+	 * @param array $searchProperties
+	 * @param string $test
+	 * @return array
+	 */
+	function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
+		return [];
+	}
+
+	/**
+	 * @param string $uri
+	 * @param string $principalPrefix
+	 * @return string
+	 */
+	function findByUri($uri, $principalPrefix) {
+		if (substr($uri, 0, 7) === 'mailto:') {
+			$email = substr($uri, 7);
+			$users = $this->userManager->getByEmail($email);
+			if (count($users) === 1) {
+				return $this->principalPrefix . '/' . $users[0]->getUID();
+			}
+		}
+
+		return '';
+	}
+
+	/**
+	 * @param IUser $user
+	 * @return array
+	 */
+	protected function userToPrincipal($user) {
+		$userId = $user->getUID();
+		$displayName = $user->getDisplayName();
+		$principal = [
+				'uri' => $this->principalPrefix . '/' . $userId,
+				'{DAV:}displayname' => is_null($displayName) ? $userId : $displayName,
+		];
+
+		$email = $user->getEMailAddress();
+		if (!empty($email)) {
+			$principal['{http://sabredav.org/ns}email-address'] = $email;
+			return $principal;
+		}
+		return $principal;
+	}
+
+	public function getPrincipalPrefix() {
+		return $this->principalPrefix;
+	}
+
+}