271 lines
11 KiB
PHP
271 lines
11 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Superclass for plugins that do authentication and/or authorization
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*
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* PHP version 5
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*
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* LICENCE: 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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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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* @category Plugin
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* @package StatusNet
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* @author Craig Andrews <candrews@integralblue.com>
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* @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET') && !defined('LACONICA')) {
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exit(1);
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}
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/**
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* Superclass for plugins that do authentication
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*
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* @category Plugin
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* @package StatusNet
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* @author Craig Andrews <candrews@integralblue.com>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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abstract class AuthenticationPlugin extends Plugin
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{
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//is this plugin authoritative for authentication?
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public $authoritative = false;
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//should accounts be automatically created after a successful login attempt?
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public $autoregistration = false;
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//can the user change their email address
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public $password_changeable=true;
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//unique name for this authentication provider
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public $provider_name;
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//------------Auth plugin should implement some (or all) of these methods------------\\
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/**
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* Check if a nickname/password combination is valid
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* @param username
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* @param password
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* @return boolean true if the credentials are valid, false if they are invalid.
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*/
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function checkPassword($username, $password)
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{
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return false;
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}
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/**
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* Automatically register a user when they attempt to login with valid credentials.
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* User::register($data) is a very useful method for this implementation
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* @param username username (that is used to login and find the user in the authentication provider) of the user to be registered
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* @param nickname nickname of the user in the SN system. If nickname is null, then set nickname = username
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* @return mixed instance of User, or false (if user couldn't be created)
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*/
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function autoRegister($username, $nickname = null)
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{
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if(is_null($nickname)){
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$nickname = $username;
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}
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$registration_data = array();
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$registration_data['nickname'] = $nickname;
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return User::register($registration_data);
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}
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/**
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* Change a user's password
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* The old password has been verified to be valid by this plugin before this call is made
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* @param username
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* @param oldpassword
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* @param newpassword
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* @return boolean true if the password was changed, false if password changing failed for some reason
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*/
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function changePassword($username,$oldpassword,$newpassword)
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{
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return false;
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}
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/**
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* Given a username, suggest what the nickname should be
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* Used during autoregistration
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* Useful if your usernames are ugly, and you want to suggest
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* nice looking nicknames when users initially sign on
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* All nicknames returned by this function should be valid
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* implementations may want to use common_nicknamize() to ensure validity
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* @param username
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* @return string nickname
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*/
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function suggestNicknameForUsername($username)
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{
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return common_nicknamize($username);
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}
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//------------Below are the methods that connect StatusNet to the implementing Auth plugin------------\\
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function onInitializePlugin(){
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if(!isset($this->provider_name)){
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throw new Exception("must specify a provider_name for this authentication provider");
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}
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}
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/**
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* Internal AutoRegister event handler
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* @param nickname
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* @param provider_name
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* @param user - the newly registered user
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*/
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function onAutoRegister($nickname, $provider_name, &$user)
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{
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if($provider_name == $this->provider_name && $this->autoregistration){
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$suggested_nickname = $this->suggestNicknameForUsername($nickname);
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$test_user = User::staticGet('nickname', $suggested_nickname);
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if($test_user) {
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//someone already exists with the suggested nickname, so used the passed nickname
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$suggested_nickname = common_nicknamize($nickname);
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}
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$test_user = User::staticGet('nickname', $suggested_nickname);
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if($test_user) {
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//someone already exists with the suggested nickname
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//not much else we can do
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}else{
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$user = $this->autoRegister($nickname, $suggested_nickname);
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if($user){
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User_username::register($user,$nickname,$this->provider_name);
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return false;
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}
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}
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}
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}
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function onStartCheckPassword($nickname, $password, &$authenticatedUser){
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//map the nickname to a username
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$user_username = new User_username();
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$user_username->username=$nickname;
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$user_username->provider_name=$this->provider_name;
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if($user_username->find() && $user_username->fetch()){
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$authenticated = $this->checkPassword($user_username->username, $password);
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if($authenticated){
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$authenticatedUser = User::staticGet('id', $user_username->user_id);
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return false;
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}
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}else{
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//$nickname is the username used to login
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//$suggested_nickname is the nickname the auth provider suggests for that username
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$suggested_nickname = $this->suggestNicknameForUsername($nickname);
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$user = User::staticGet('nickname', $suggested_nickname);
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if($user){
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//make sure this user isn't claimed
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$user_username = new User_username();
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$user_username->user_id=$user->id;
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$we_can_handle = false;
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if($user_username->find()){
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//either this provider, or another one, has already claimed this user
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//so we cannot. Let another plugin try.
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return;
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}else{
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//no other provider claims this user, so it's safe for us to handle it
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$authenticated = $this->checkPassword($nickname, $password);
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if($authenticated){
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$authenticatedUser = $user;
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User_username::register($authenticatedUser,$nickname,$this->provider_name);
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return false;
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}
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}
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}else{
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$authenticated = $this->checkPassword($nickname, $password);
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if($authenticated){
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if(! Event::handle('AutoRegister', array($nickname, $this->provider_name, &$authenticatedUser))){
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//unlike most Event::handle lines of code, this one has a ! (not)
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//we want to do this if the event *was* handled - this isn't a "default" implementation
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//like most code of this form.
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if($authenticatedUser){
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return false;
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}
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}
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}
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}
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}
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if($this->authoritative){
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return false;
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}else{
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//we're not authoritative, so let other handlers try
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return;
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}
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}
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function onStartChangePassword($user,$oldpassword,$newpassword)
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{
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if($this->password_changeable){
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$user_username = new User_username();
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$user_username->user_id=$user->id;
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$user_username->provider_name=$this->provider_name;
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if($user_username->find() && $user_username->fetch()){
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$authenticated = $this->checkPassword($user_username->username, $oldpassword);
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if($authenticated){
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$result = $this->changePassword($user_username->username,$oldpassword,$newpassword);
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if($result){
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//stop handling of other handlers, because what was requested was done
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return false;
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}else{
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throw new Exception(_('Password changing failed'));
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}
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}else{
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if($this->authoritative){
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//since we're authoritative, no other plugin could do this
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throw new Exception(_('Password changing failed'));
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}else{
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//let another handler try
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return null;
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}
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}
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}
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}else{
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if($this->authoritative){
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//since we're authoritative, no other plugin could do this
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throw new Exception(_('Password changing is not allowed'));
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}
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}
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}
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function onStartAccountSettingsPasswordMenuItem($widget)
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{
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if($this->authoritative && !$this->password_changeable){
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//since we're authoritative, no other plugin could change passwords, so do not render the menu item
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return false;
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}
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}
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function onCheckSchema() {
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$schema = Schema::get();
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$schema->ensureTable('user_username',
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array(new ColumnDef('provider_name', 'varchar',
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'255', false, 'PRI'),
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new ColumnDef('username', 'varchar',
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'255', false, 'PRI'),
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new ColumnDef('user_id', 'integer',
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null, false),
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new ColumnDef('created', 'datetime',
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null, false),
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new ColumnDef('modified', 'timestamp')));
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return true;
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}
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function onUserDeleteRelated($user, &$tables)
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{
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$tables[] = 'User_username';
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return true;
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}
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}
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