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Lukas Reschke authoredI need this to intercept passwords for my WIP multi-factor authentication app.
Lukas Reschke authoredI need this to intercept passwords for my WIP multi-factor authentication app.
user.php 17.94 KiB
<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @copyright 2012 Frank Karlitschek frank@owncloud.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* This class provides wrapper methods for user management. Multiple backends are
* supported. User management operations are delegated to the configured backend for
* execution.
*
* Hooks provided:
* pre_createUser(&run, uid, password)
* post_createUser(uid, password)
* pre_deleteUser(&run, uid)
* post_deleteUser(uid)
* pre_setPassword(&run, uid, password)
* post_setPassword(uid, password)
* pre_login(&run, uid, password)
* post_login(uid)
* logout()
*/
class OC_User {
// The backend used for user management
private static $_usedBackends = array();
private static $_setupedBackends = array();
// Backends available (except database)
private static $_backends = array();
/**
* @brief registers backend
* @param $name name of the backend
* @returns true/false
*
* Makes a list of backends that can be used by other modules
*/
public static function registerBackend( $backend ) {
self::$_backends[] = $backend;
return true;
}
/**
* @brief gets available backends
* @returns array of backends
*
* Returns the names of all backends.
*/
public static function getBackends() {
return self::$_backends;
}
/** * @brief gets used backends
* @returns array of backends
*
* Returns the names of all used backends.
*/
public static function getUsedBackends() {
return array_keys(self::$_usedBackends);
}
/**
* @brief Adds the backend to the list of used backends
* @param $backend default: database The backend to use for user managment
* @returns true/false
*
* Set the User Authentication Module
*/
public static function useBackend( $backend = 'database' ) {
if($backend instanceof OC_User_Interface) {
OC_Log::write('core', 'Adding user backend instance of '.get_class($backend).'.', OC_Log::DEBUG);
self::$_usedBackends[get_class($backend)]=$backend;
} else {
// You'll never know what happens
if( null === $backend OR !is_string( $backend )) {
$backend = 'database';
}
// Load backend
switch( $backend ) {
case 'database':
case 'mysql':
case 'sqlite':
OC_Log::write('core', 'Adding user backend '.$backend.'.', OC_Log::DEBUG);
self::$_usedBackends[$backend] = new OC_User_Database();
break;
default:
OC_Log::write('core', 'Adding default user backend '.$backend.'.', OC_Log::DEBUG);
$className = 'OC_USER_' . strToUpper($backend);
self::$_usedBackends[$backend] = new $className();
break;
}
}
return true;
}
/**
* remove all used backends
*/
public static function clearBackends() {
self::$_usedBackends=array();
}
/**
* setup the configured backends in config.php
*/
public static function setupBackends() {
$backends=OC_Config::getValue('user_backends', array());
foreach($backends as $i=>$config) {
$class=$config['class'];
$arguments=$config['arguments'];
if(class_exists($class)) {
if(array_search($i, self::$_setupedBackends)===false) {
// make a reflection object
$reflectionObj = new ReflectionClass($class);
// use Reflection to create a new instance, using the $args
$backend = $reflectionObj->newInstanceArgs($arguments);
self::useBackend($backend);
$_setupedBackends[]=$i;
} else {
OC_Log::write('core', 'User backend '.$class.' already initialized.', OC_Log::DEBUG); }
} else {
OC_Log::write('core', 'User backend '.$class.' not found.', OC_Log::ERROR);
}
}
}
/**
* @brief Create a new user
* @param $uid The username of the user to create
* @param $password The password of the new user
* @returns true/false
*
* Creates a new user. Basic checking of username is done in OC_User
* itself, not in its subclasses.
*
* Allowed characters in the username are: "a-z", "A-Z", "0-9" and "_.@-"
*/
public static function createUser( $uid, $password ) {
// Check the name for bad characters
// Allowed are: "a-z", "A-Z", "0-9" and "_.@-"
if( preg_match( '/[^a-zA-Z0-9 _\.@\-]/', $uid )) {
throw new Exception('Only the following characters are allowed in a username:'
.' "a-z", "A-Z", "0-9", and "_.@-"');
}
// No empty username
if(trim($uid) == '') {
throw new Exception('A valid username must be provided');
}
// No empty password
if(trim($password) == '') {
throw new Exception('A valid password must be provided');
}
// Check if user already exists
if( self::userExistsForCreation($uid) ) {
throw new Exception('The username is already being used');
}
$run = true;
OC_Hook::emit( "OC_User", "pre_createUser", array( "run" => &$run, "uid" => $uid, "password" => $password ));
if( $run ) {
//create the user in the first backend that supports creating users
foreach(self::$_usedBackends as $backend) {
if(!$backend->implementsActions(OC_USER_BACKEND_CREATE_USER))
continue;
$backend->createUser($uid, $password);
OC_Hook::emit( "OC_User", "post_createUser", array( "uid" => $uid, "password" => $password ));
return self::userExists($uid);
}
}
return false;
}
/**
* @brief delete a user
* @param $uid The username of the user to delete
* @returns true/false
*
* Deletes a user
*/
public static function deleteUser( $uid ) {
$run = true;
OC_Hook::emit( "OC_User", "pre_deleteUser", array( "run" => &$run, "uid" => $uid ));
if( $run ) { //delete the user from all backends
foreach(self::$_usedBackends as $backend) {
$backend->deleteUser($uid);
}
if (self::userExists($uid)) {
return false;
}
// We have to delete the user from all groups
foreach( OC_Group::getUserGroups( $uid ) as $i ) {
OC_Group::removeFromGroup( $uid, $i );
}
// Delete the user's keys in preferences
OC_Preferences::deleteUser($uid);
// Delete user files in /data/
OC_Helper::rmdirr(OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" ) . '/'.$uid.'/');
// Emit and exit
OC_Hook::emit( "OC_User", "post_deleteUser", array( "uid" => $uid ));
return true;
}
else{
return false;
}
}
/**
* @brief Try to login a user
* @param $uid The username of the user to log in
* @param $password The password of the user
* @returns true/false
*
* Log in a user and regenerate a new session - if the password is ok
*/
public static function login( $uid, $password ) {
$run = true;
OC_Hook::emit( "OC_User", "pre_login", array( "run" => &$run, "uid" => $uid, "password" => $password));
if( $run ) {
$uid = self::checkPassword( $uid, $password );
$enabled = self::isEnabled($uid);
if($uid && $enabled) {
session_regenerate_id(true);
self::setUserId($uid);
self::setDisplayName($uid);
OC_Hook::emit( "OC_User", "post_login", array( "uid" => $uid, 'password'=>$password ));
return true;
}
}
return false;
}
/**
* @brief Sets user id for session and triggers emit
*/
public static function setUserId($uid) {
$_SESSION['user_id'] = $uid;
}
/**
* @brief Sets user display name for session
*/
public static function setDisplayName($uid, $displayName = null) {
$result = false;
if ($displayName ) {
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_SET_DISPLAYNAME)) {
if($backend->userExists($uid)) {
$result |= $backend->setDisplayName($uid, $displayName);
} }
}
} else {
$displayName = self::determineDisplayName($uid);
$result = true;
}
if (OC_User::getUser() === $uid) {
$_SESSION['display_name'] = $displayName;
}
return $result;
}
/**
* @brief get display name
* @param $uid The username
* @returns string display name or uid if no display name is defined
*
*/
private static function determineDisplayName( $uid ) {
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_GET_DISPLAYNAME)) {
$result=$backend->getDisplayName( $uid );
if($result) {
return $result;
}
}
}
return $uid;
}
/**
* @brief Logs the current user out and kills all the session data
*
* Logout, destroys session
*/
public static function logout() {
OC_Hook::emit( "OC_User", "logout", array());
session_unset();
session_destroy();
OC_User::unsetMagicInCookie();
}
/**
* @brief Check if the user is logged in
* @returns true/false
*
* Checks if the user is logged in
*/
public static function isLoggedIn() {
if( isset($_SESSION['user_id']) AND $_SESSION['user_id']) {
OC_App::loadApps(array('authentication'));
self::setupBackends();
if (self::userExists($_SESSION['user_id']) ) {
return true;
}
}
return false;
}
/**
* @brief Check if the user is an admin user
* @param $uid uid of the admin
* @returns bool
*/
public static function isAdminUser($uid) {
if(OC_Group::inGroup($uid, 'admin' )) {
return true;
}
return false; }
/**
* @brief get the user id of the user currently logged in.
* @return string uid or false
*/
public static function getUser() {
if( isset($_SESSION['user_id']) AND $_SESSION['user_id'] ) {
return $_SESSION['user_id'];
}
else{
return false;
}
}
/**
* @brief get the display name of the user currently logged in.
* @return string uid or false
*/
public static function getDisplayName($user=null) {
if ( $user ) {
return self::determineDisplayName($user);
} else if( isset($_SESSION['display_name']) AND $_SESSION['display_name'] ) {
return $_SESSION['display_name'];
}
else{
return false;
}
}
/**
* @brief Autogenerate a password
* @returns string
*
* generates a password
*/
public static function generatePassword() {
return OC_Util::generate_random_bytes(30);
}
/**
* @brief Set password
* @param $uid The username
* @param $password The new password
* @returns true/false
*
* Change the password of a user
*/
public static function setPassword( $uid, $password ) {
$run = true;
OC_Hook::emit( "OC_User", "pre_setPassword", array( "run" => &$run, "uid" => $uid, "password" => $password ));
if( $run ) {
$success = false;
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_SET_PASSWORD)) {
if($backend->userExists($uid)) {
$success |= $backend->setPassword($uid, $password);
}
}
}
// invalidate all login cookies
OC_Preferences::deleteApp($uid, 'login_token');
OC_Hook::emit( "OC_User", "post_setPassword", array( "uid" => $uid, "password" => $password ));
return $success;
}
else{
return false;
} }
/**
* @brief Check whether user can change his password
* @param $uid The username
* @returns true/false
*
* Check whether a specified user can change his password
*/
public static function canUserChangePassword($uid) {
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_SET_PASSWORD)) {
if($backend->userExists($uid)) {
return true;
}
}
}
return false;
}
/**
* @brief Check whether user can change his display name
* @param $uid The username
* @returns true/false
*
* Check whether a specified user can change his display name
*/
public static function canUserChangeDisplayName($uid) {
if (OC_Config::getValue('allow_user_to_change_display_name', true)) {
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_SET_DISPLAYNAME)) {
if($backend->userExists($uid)) {
return true;
}
}
}
}
return false;
}
/**
* @brief Check if the password is correct
* @param $uid The username
* @param $password The password
* @returns string
*
* Check if the password is correct without logging in the user
* returns the user id or false
*/
public static function checkPassword( $uid, $password ) {
foreach(self::$_usedBackends as $backend) {
if($backend->implementsActions(OC_USER_BACKEND_CHECK_PASSWORD)) {
$result=$backend->checkPassword( $uid, $password );
if($result) {
return $result;
}
}
}
}
/**
* @brief Check if the password is correct
* @param string $uid The username
* @param string $password The password
* @returns string
*
* returns the path to the users home directory
*/
public static function getHome($uid) {
foreach(self::$_usedBackends as $backend) { if($backend->implementsActions(OC_USER_BACKEND_GET_HOME) && $backend->userExists($uid)) {
$result=$backend->getHome($uid);
if($result) {
return $result;
}
}
}
return OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" ) . '/' . $uid;
}
/**
* @brief Get a list of all users
* @returns array with all uids
*
* Get a list of all users.
*/
public static function getUsers($search = '', $limit = null, $offset = null) {
$users = array();
foreach (self::$_usedBackends as $backend) {
$backendUsers = $backend->getUsers($search, $limit, $offset);
if (is_array($backendUsers)) {
$users = array_merge($users, $backendUsers);
}
}
asort($users);
return $users;
}
/**
* @brief Get a list of all users display name
* @returns associative array with all display names (value) and corresponding uids (key)
*
* Get a list of all display names and user ids.
*/
public static function getDisplayNames($search = '', $limit = null, $offset = null) {
$displayNames = array();
foreach (self::$_usedBackends as $backend) {
$backendDisplayNames = $backend->getDisplayNames($search, $limit, $offset);
if (is_array($backendDisplayNames)) {
$displayNames = $displayNames + $backendDisplayNames;
}
}
asort($displayNames);
return $displayNames;
}
/**
* @brief check if a user exists
* @param string $uid the username
* @param string $excludingBackend (default none)
* @return boolean
*/
public static function userExists($uid, $excludingBackend=null) {
foreach(self::$_usedBackends as $backend) {
if (!is_null($excludingBackend) && !strcmp(get_class($backend), $excludingBackend)) {
OC_Log::write('OC_User', $excludingBackend . 'excluded from user existance check.', OC_Log::DEBUG);
continue;
}
$result=$backend->userExists($uid);
if($result===true) {
return true;
}
}
return false;
}
public static function userExistsForCreation($uid) {
foreach(self::$_usedBackends as $backend) {
if(!$backend->hasUserListings())
continue;
$result=$backend->userExists($uid);
if($result===true) {
return true;
}
}
return false;
}
/**
* disables a user
* @param string $userid the user to disable
*/
public static function disableUser($userid) {
$sql = "INSERT INTO `*PREFIX*preferences` (`userid`, `appid`, `configkey`, `configvalue`) VALUES(?, ?, ?, ?)";
$stmt = OC_DB::prepare($sql);
if ( ! OC_DB::isError($stmt) ) {
$result = $stmt->execute(array($userid, 'core', 'enabled', 'false'));
if ( OC_DB::isError($result) ) {
OC_Log::write('OC_User', 'could not enable user: '. OC_DB::getErrorMessage($result), OC_Log::ERROR);
}
} else {
OC_Log::write('OC_User', 'could not disable user: '. OC_DB::getErrorMessage($stmt), OC_Log::ERROR);
}
}
/**
* enable a user
* @param string $userid
*/
public static function enableUser($userid) {
$sql = 'DELETE FROM `*PREFIX*preferences`'
." WHERE `userid` = ? AND `appid` = ? AND `configkey` = ? AND `configvalue` = ?";
$stmt = OC_DB::prepare($sql);
if ( ! OC_DB::isError($stmt) ) {
$result = $stmt->execute(array($userid, 'core', 'enabled', 'false'));
if ( OC_DB::isError($result) ) {
OC_Log::write('OC_User', 'could not enable user: '. OC_DB::getErrorMessage($result), OC_Log::ERROR);
}
} else {
OC_Log::write('OC_User', 'could not enable user: '. OC_DB::getErrorMessage($stmt), OC_Log::ERROR);
}
}
/**
* checks if a user is enabled
* @param string $userid
* @return bool
*/
public static function isEnabled($userid) {
$sql = 'SELECT `userid` FROM `*PREFIX*preferences`'
.' WHERE `userid` = ? AND `appid` = ? AND `configkey` = ? AND `configvalue` = ?';
$stmt = OC_DB::prepare($sql);
if ( ! OC_DB::isError($stmt) ) {
$result = $stmt->execute(array($userid, 'core', 'enabled', 'false'));
if ( ! OC_DB::isError($result) ) {
return $result->numRows() ? false : true;
} else {
OC_Log::write('OC_User',
'could not check if enabled: '. OC_DB::getErrorMessage($result),
OC_Log::ERROR);
}
} else {
OC_Log::write('OC_User', 'could not check if enabled: '. OC_DB::getErrorMessage($stmt), OC_Log::ERROR);
}
return false;
}
/**
* @brief Set cookie value to use in next page load * @param string $username username to be set
*/
public static function setMagicInCookie($username, $token) {
$secure_cookie = OC_Config::getValue("forcessl", false);
$expires = time() + OC_Config::getValue('remember_login_cookie_lifetime', 60*60*24*15);
setcookie("oc_username", $username, $expires, OC::$WEBROOT, '', $secure_cookie);
setcookie("oc_token", $token, $expires, OC::$WEBROOT, '', $secure_cookie, true);
setcookie("oc_remember_login", true, $expires, OC::$WEBROOT, '', $secure_cookie);
}
/**
* @brief Remove cookie for "remember username"
*/
public static function unsetMagicInCookie() {
unset($_COOKIE["oc_username"]);
unset($_COOKIE["oc_token"]);
unset($_COOKIE["oc_remember_login"]);
setcookie("oc_username", null, -1);
setcookie("oc_token", null, -1);
setcookie("oc_remember_login", null, -1);
}
}