lib.php 42.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
<?php
/**
 * This program is part of Mahara
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * @package    mahara
Nigel McNie's avatar
Nigel McNie committed
20
 * @subpackage auth
21
22
23
24
25
26
27
28
 * @author     Nigel McNie <nigel@catalyst.net.nz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
 *
 */

defined('INTERNAL') || die();

29
require('session.php');
30
require(get_config('docroot') . 'auth/user.php');
31

Nigel McNie's avatar
Nigel McNie committed
32
33
34
/**
 * Unknown user exception
 */
35
class AuthUnknownUserException extends UserException {}
36

37
38
39
40
41
42
/**
 * We tried to call a method on an auth plugin that hasn't been init'ed 
 * successfully
 */
class UninitialisedAuthException extends SystemException {}

43
44
45
/**
 * Base authentication class. Provides a common interface with which
 * authentication can be carried out for system users.
Nigel McNie's avatar
Nigel McNie committed
46
47
48
49
50
51
 *
 * @todo for authentication:
 *   - inactivity: each institution has inactivity timeout times, this needs
 *     to be supported
 *     - this means the lastlogin field needs to be updated on the usr table
 *     - warnings are handled by cron
52
53
54
 */
abstract class Auth {

55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
    protected $instanceid;
    protected $institution;
    protected $instancename;
    protected $priority;
    protected $authname;
    protected $config;
    protected $has_config;
    protected $type;
    protected $ready;

    /**
     * Given an id, create the auth object and retrieve the config settings
     * If an instance ID is provided, get all the *instance* config settings
     *
     * @param  int  $id   The unique ID of the auth instance
     * @return bool       Whether the create was successful
     */
    public function __construct($id = null) {
        $this->ready = false;
    }

    /**
     * Instantiate the plugin by pulling the config data for an instance from
     * the database
     *
     * @param  int  $id   The unique ID of the auth instance
     * @return bool       Whether the create was successful
     */
    public function init($id) {
        if (!is_numeric($id) || intval($id) != $id) {
            throw new UserNotFoundException();
        }

        $instance = get_record('auth_instance', 'id', $id);
        if (empty($instance)) {
            throw new UserNotFoundException();
        }

        $this->instanceid   = $id;
        $this->institution  = $instance->institution;
        $this->instancename = $instance->instancename;
        $this->priority     = $instance->priority;
        $this->authname     = $instance->authname;

        // Return now if the plugin type doesn't require any config 
        // (e.g. internal)
        if ($this->has_config == false) {
            return true;
        }

        $records = get_records_array('auth_instance_config', 'instance', $this->instanceid);

        if ($records == false) {
            return false;
        }

        foreach($records as $record) {
            $this->config[$record->field] = $record->value;
        }

        return true;
    }

    /**
     * The __get overloader is invoked when the requested member is private or
     * protected, or just doesn't exist.
     * 
     * @param  string  $name   The name of the value to fetch
     * @return mixed           The value
     */
    public function __get($name) {
        $approved_members = array('instanceid', 'institution', 'instancename', 'priority', 'authname');

        if (in_array($name, $approved_members)) {
            return $this->{$name};
        }

        if (isset($this->config['name'])) {
            return $this->config['name'];
        }
        return null;
    }

    /**
     * The __set overloader is invoked when the specified member is private or
     * protected, or just doesn't exist.
     * 
     * @param  string  $name   The name of the value to set
     * @param  mixed   $value  The value to assign
     * @return void
     */
    public function __set($name, $value) {
        /*
        if (property_exists($this, $name)) {
            $this->{$name} = $value;
            return;
        }
        */
        throw new SystemException('It\'s forbidden to set values on Auth objects');
    }

    /**
     * Check that the plugin has been initialised before we try to use it.
     * 
     * @throws UninitialisedAuthException
     * @return bool 
     */
    protected function must_be_ready() {
        if ($this->ready == false) {
            throw new UninitialisedAuthException('This Auth plugin has not been initialised');
        }
        return true;
    }

    /**
     * Fetch the URL that users can visit to change their passwords. This might
     * be a Moodle installation, for example.
     * 
     * @return  mixed   URL to change password or false if there is none
     */
    public function changepasswordurl() {
        $this->must_be_ready();
        if (empty($this->config['changepasswordurl'])) {
            return false;
        }
        return $this->config['changepasswordurl'];
    }

183
    /**
184
     * Given a username and password, attempts to log the user in.
185
     *
186
     * @param object $user      An object with username member (at least)
187
188
189
190
191
     * @param string $password  The password to use for the attempt
     * @return bool             Whether the authentication was successful
     * @throws AuthUnknownUserException  If the user is unknown to the
     *                                   authentication method
     */
192
193
194
195
    public function authenticate_user_account($user, $password) {
        $this->must_be_ready();
        return false;
    }
196

197
198
199
200
201
202
    /**
     * Given a username, returns whether the user exists in the usr table
     *
     * @param string $username The username to attempt to identify
     * @return bool            Whether the username exists
     */
203
204
205
206
207
208
209
    public function user_exists($username) {
        $this->must_be_ready();
        if (record_exists('usr', 'LOWER(username)', strtolower($username), 'authinstance', $this->instanceid)) {
            return true;
        }
        throw new AuthUnknownUserException("\"$username\" is not known to Auth");
    }
210

211
    /**
212
213
     * Given a username, returns a hash of information about a user from the
     * external data source, e.g. Moodle or Drupal.
214
215
216
217
218
219
     *
     * @param string $username The username to look up information for
     * @return array           The information for the user
     * @throws AuthUnknownUserException If the user is unknown to the
     *                                  authentication method
     */
220
221
222
    public function get_user_info($username) {
        return false;
    }
223

224
225
    /**
     * Given a username, return information about the user from the database.
226
227
     * This object must_be_ready, which means it will have an authinstanceid. 
     * This is used to disambiguate between users with the same username.
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
     *
     * The information retrieved must be all rows in the user table, with the
     * timestamps formatted as unix timestamps. An example (taken from the
     * internal authentication mechanism, which allows usernames to be case
     * insensitive):
     *
     * <code>
     * get_record('usr', 'LOWER(username)', strtolower($username), null, null, null, null,
     *    '*, ' . db_format_tsfield('expiry') . ', ' . db_format_tsfield('lastlogin'));
     * </code>
     *
     * @param string $username The username to get information for
     * @return array           Data that can be used to populate the session
     * @throws AuthUnknownUserException If the user is unknown to the
     *                                  authentication method
     */
244
245
246
247
248
249
250
251
252
    public function get_user_info_cached($username) {
        $this->must_be_ready();
        if (!$result = get_record('usr', 'LOWER(username)', strtolower($username), 'authinstance', $this->instanceid,
                    '*, ' . db_format_tsfield('expiry') . ', ' . db_format_tsfield('lastlogin'))) {
            throw new AuthUnknownUserException("\"$username\" is not known to AuthInternal");
        }
        $cache[$result->username] = $result;
        return $result;
    }
253

Nigel McNie's avatar
Nigel McNie committed
254
255
256
257
    /**
     * Given a password, returns whether it is in a valid format for this
     * authentication method.
     *
258
259
260
261
262
     * This only needs to be defined by subclasses if:
     *  - They implement the change_password method, which means that the
     *    system can use the <kbd>passwordchange</kbd> flag on the <kbd>usr</kbd>
     *    table to control whether the user's password needs changing.
     *  - The password that a user can set must be in a certain format.
Nigel McNie's avatar
Nigel McNie committed
263
264
265
266
     *
     * The default behaviour is to assume that the password is in a valid form,
     * so make sure to implement this method if this is not the case!
     *
267
268
269
     * This method is defined to be empty, so that authentication methods do 
     * not have to specify a format if they do not need to.
     *
Nigel McNie's avatar
Nigel McNie committed
270
271
272
     * @param string $password The password to check
     * @return bool            Whether the username is in valid form.
     */
273
    public function is_password_valid($password) {
Nigel McNie's avatar
Nigel McNie committed
274
275
276
        return true;
    }

277
278
279
}


280
281
282
283
/******************************************************************************/
    // End of Auth base-class
/******************************************************************************/

284
/**
285
286
 * Handles authentication by setting up a session for a user if they are logged 
 * in.
287
288
289
290
291
292
293
294
 *
 * This function combined with the Session class is smart - if the user is not
 * logged in then they do not get a session, which prevents simple curl hits
 * or search engine crawls to a page from getting sessions they won't use.
 *
 * Once the user has a session, they keep it even if the log out, so it can
 * be reused. The session does expire, but the expiry time is typically a week
 * or more.
Nigel McNie's avatar
Nigel McNie committed
295
296
297
298
299
300
301
 *
 * If the user is not authenticated for this page, then this function will
 * exit, printing the login page. Therefore, after including init.php, you can
 * be sure that the user is logged in, or has a valid guest key. However, no
 * testing is done to make sure the user has the required permissions to see
 * the page.
 *
302
303
 */
function auth_setup () {
304
    global $SESSION, $USER;
305
306
307
308

    // If the system is not installed, let the user through in the hope that
    // they can fix this little problem :)
    if (!get_config('installed')) {
309
        $USER->logout();
310
311
312
313
314
        return;
    }

    // Check the time that the session is set to log out. If the user does
    // not have a session, this time will be 0.
315
    $sessionlogouttime = $USER->get('logout_time');
Nigel McNie's avatar
Nigel McNie committed
316
    if ($sessionlogouttime && isset($_GET['logout'])) {
317
318
        $USER->logout();
        $SESSION->add_ok_msg(get_string('loggedoutok'));
319
        redirect();
Nigel McNie's avatar
Nigel McNie committed
320
321
    }
    if ($sessionlogouttime > time()) {
322
        // The session is still active, so continue it.
323
324
325
        // Make sure that if a user's admin status has changed, they're kicked
        // out of the admin section
        if (defined('ADMIN')) {
326
            $userreallyadmin = get_field('usr', 'admin', 'id', $USER->id);
327
            if (!$USER->get('admin') && $userreallyadmin) {
328
                // The user has been made into an admin
329
                $USER->admin = 1;
330
            }
331
            else if ($USER->get('admin') && !$userreallyadmin) {
332
                // The user's admin rights have been taken away
333
                $USER->admin = 0;
334
                $SESSION->add_error_msg(get_string('accessforbiddentoadminsection'));
335
                redirect();
336
            }
337
            elseif (!$USER->get('admin')) {
338
                // The user never was an admin
339
                $SESSION->add_error_msg(get_string('accessforbiddentoadminsection'));
340
                redirect();
341
            }
342
        }
343
        $USER->renew();
Nigel McNie's avatar
Nigel McNie committed
344
        auth_check_password_change();
345
346
347
    }
    else if ($sessionlogouttime > 0) {
        // The session timed out
348
        $USER->logout();
349
350
351
352
353
354
355
356
357
358
359

        // If the page the user is viewing is public, inform them that they can
        // log in again
        if (defined('PUBLIC')) {
            // @todo this links to ?login - later it should do magic to make
            // sure that whatever GET string is made it includes the old data
            // correctly
            $SESSION->add_info_msg(get_string('sessiontimedoutpublic'), false);
            return;
        }

360
        auth_draw_login_page(get_string('sessiontimedout'));
361
362
363
    }
    else {
        // There is no session, so we check to see if one needs to be started.
364
        // Build login form. If the form is submitted it will be handled here,
365
366
        // and set $USER for us (this will happen when users hit a page and
        // specify login data immediately
367
368
        require_once('pieforms/pieform.php');
        $form = new Pieform(auth_get_login_form());
369
370
        if ($USER->is_logged_in()) {
            return;
371
372
373
        }
        
        // Check if the page is public or the site is configured to be public.
374
        if (defined('PUBLIC') && !isset($_GET['login'])) {
375
            return;
376
        }
377
        
378
        auth_draw_login_page(null, $form);
379
        exit;
380
381
382
383
    }
}

/**
384
 * Given an institution, returns the authentication methods used by it.
385
 *
386
387
 * @param  string   $institution     Name of the institution
 * @return array                     Array of auth instance records
388
 */
389
function auth_get_auth_instances_for_institution($institution) {
Nigel McNie's avatar
Nigel McNie committed
390
    static $cache = array();
391
392
393
394
395
396

    if (!isset($cache[$institution])) {
        $cache[$institution] = get_records_array('auth_instance', 'institution', $institution, 'priority, instancename', 'id, instancename, priority, authname');
        if(empty($cache[$institution])) {
            return false;
        }
Nigel McNie's avatar
Nigel McNie committed
397
    }
398
399

    return $cache[$institution];
400
401
}

402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
/**
 * Given a user, returns the authentication instance used.
 *
 * @param  object   $user            User object with an authinstance member
 * @return array                     Array of auth instance records
 */
function auth_get_auth_instance($user) {
    static $cache = array();

    if (!isset($cache[$user->id])) {
        $cache[$user->id] = get_record('auth_instance', 'id', $user->authinstance, null, null, null, null, 'id, instancename, priority, authname');
    }

    return $cache[$user->id];
}

418
419
420
421
422
423
424
425
/**
 * Checks whether the current user needs to change their password, and handles
 * the password changing if it's required.
 *
 * This only applies for the internal authentication plugin. Other plugins
 * will, in theory, have different data stores, making changing the password
 * via the internal form difficult.
 */
Nigel McNie's avatar
Nigel McNie committed
426
427
function auth_check_password_change() {
    global $USER;
428
    if (!$USER->get('passwordchange')) {
Nigel McNie's avatar
Nigel McNie committed
429
430
431
        return;
    }

432
433
434
435
436
437
438
    $authobj = AuthFactory::create($USER->authinstance);

    if ($authobj->changepasswordurl) {
        redirect($authobj->changepasswordurl);
        exit;
    }

Nigel McNie's avatar
Nigel McNie committed
439
    // @todo auth preference for a password change screen for all auth methods other than internal
440
    if (method_exists($authobj, 'change_password')) {
Nigel McNie's avatar
Nigel McNie committed
441

442
        require_once('pieforms/pieform.php');
443
        $form = array(
Nigel McNie's avatar
Nigel McNie committed
444
445
446
447
448
            'name'       => 'change_password',
            'method'     => 'post',
            'plugintype' => 'auth',
            'pluginname' => 'internal',
            'elements'   => array(
449
450
451
452
453
454
455
456
457
458
459
460
461
                'password1' => array(
                    'type'        => 'password',
                    'title'       => get_string('newpassword') . ':',
                    'description' => get_string('yournewpassword'),
                    'rules'       => array(
                        'required' => true
                    )
                ),
                'password2' => array(
                    'type'        => 'password',
                    'title'       => get_string('confirmpassword') . ':',
                    'description' => get_string('yournewpasswordagain'),
                    'rules'       => array(
462
463
464
465
466
467
468
469
470
471
472
                        'required' => true,
                    ),
                ),
                'email' => array(
                    'type'   => 'text',
                    'title'  => get_string('principalemailaddress', 'artefact.internal'),
                    'ignore' => (trim($USER->get('email')) != '' && !preg_match('/@example\.org$/', $USER->get('email'))),
                    'rules'  => array(
                        'required' => true,
                        'email'    => true,
                    ),
473
474
                ),
                'submit' => array(
Nigel McNie's avatar
Nigel McNie committed
475
                    'type'  => 'submit',
476
477
                    'value' => get_string('changepassword'),
                ),
478
479
480
481
            )
        );

        $smarty = smarty();
482
        $smarty->assign('change_password_form', pieform($form));
483
484
485
486
487
488
489
490
        $smarty->display('change_password.tpl');
        exit;
    }
}

/**
 * Validates the form for changing the password for a user.
 *
Nigel McNie's avatar
Nigel McNie committed
491
 * Change password will only be if a URL for it exists, or a function exists.
Nigel McNie's avatar
Nigel McNie committed
492
 *
493
494
 * @param Pieform  $form   The form to check
 * @param array    $values The values to check
495
 */
496
function change_password_validate(Pieform $form, $values) {
497
    global $USER;
498

499
    // Get the authentication type for the user, and
500
    // use the information to validate the password
501
    $authobj = AuthFactory::create($USER->authinstance);
502

Nigel McNie's avatar
Nigel McNie committed
503
    // @todo this could be done by a custom form rule... 'password' => $user
504
    password_validate_user($form, $values, $USER);
505

Nigel McNie's avatar
Nigel McNie committed
506
    // The password cannot be the same as the old one
507
    if (!$form->get_error('password1')
508
        && $authobj->authenticate_user_account($USER, $values['password1'])) {
Nigel McNie's avatar
Nigel McNie committed
509
        $form->set_error('password1', get_string('passwordnotchanged'));
510
511
512
513
514
515
516
517
    }
}

/**
 * Changes the password for a user, given that it is valid.
 *
 * @param array $values The submitted form values
 */
518
function change_password_submit(Pieform $form, $values) {
519
    global $USER, $SESSION;
520
521

    $authobj = AuthFactory::create($USER->authinstance);
Nigel McNie's avatar
Nigel McNie committed
522

523
    // This method should exist, because if it did not then the change
Nigel McNie's avatar
Nigel McNie committed
524
    // password form would not have been shown.
525
    if ($password = $authobj->change_password($USER, $values['password1'])) {
Nigel McNie's avatar
Nigel McNie committed
526
        $SESSION->add_ok_msg(get_string('passwordsaved'));
527
        if (!empty($values['email'])) {
528
            set_profile_field($USER->id, 'email', $values['email']);
529
        }
530
        redirect();
531
    }
Nigel McNie's avatar
Nigel McNie committed
532

533
534
    throw new Exception('Attempt by "' . $USER->get('username') . '@'
        . $USER->get('institution') . 'to change their password failed');
535
536
}

537
/**
Nigel McNie's avatar
Nigel McNie committed
538
 * Creates and displays the transient login page.
539
 *
Nigel McNie's avatar
Nigel McNie committed
540
541
542
543
 * This login page remembers all GET/POST data and passes it on. This way,
 * users can have their sessions time out, and then can log in again without
 * losing any of their data.
 *
544
545
546
 * As this function builds and validates a login form, it is possible that
 * calling this may validate a user to be logged in.
 *
547
548
549
 * @param Pieform $form If specified, just build this form to get the HTML
 *                      required. Otherwise, this function will build and
 *                      validate the form itself.
Nigel McNie's avatar
Nigel McNie committed
550
 * @access private
551
 */
552
function auth_draw_login_page($message=null, Pieform $form=null) {
553
    global $USER, $SESSION;
554
    if ($form != null) {
Nigel McNie's avatar
Nigel McNie committed
555
        $loginform = get_login_form_js($form->build());
556
557
    }
    else {
558
        require_once('pieforms/pieform.php');
559
        $loginform = get_login_form_js(pieform(auth_get_login_form()));
560
561
562
563
564
        /*
         * If $USER is set, the form was submitted even before being built.
         * This happens when a user's session times out and they resend post
         * data. The request should just continue if so.
         */
565
        if ($USER->is_logged_in()) {
566
567
568
569
570
571
572
            return;
        }

    }

    if ($message) {
        $SESSION->add_info_msg($message);
573
    }
574
    $smarty = smarty();
575
    $smarty->assign('login_form', $loginform);
Richard Mansfield's avatar
Richard Mansfield committed
576
    $smarty->assign('loginmessage', get_string('loginto', 'mahara', get_config('sitename')));
577
578
579
    $smarty->display('login.tpl');
    exit;
}
580

581
/**
Nigel McNie's avatar
Nigel McNie committed
582
 * Returns the definition of the login form.
583
 *
Nigel McNie's avatar
Nigel McNie committed
584
585
 * @return array   The login form definition array.
 * @access private
586
587
 */
function auth_get_login_form() {
588
    $institutions = get_records_menu('institution', '', '', 'name, displayname');
589
590
591
592
593
    $defaultinstitution = get_cookie('institution');
    if (!$defaultinstitution) {
        $defaultinstitution = 'mahara';
    }

594
    $elements = array(
Nigel McNie's avatar
Nigel McNie committed
595
596
597
598
599
600
        'login_username' => array(
            'type'        => 'text',
            'title'       => get_string('username') . ':',
            'description' => get_string('usernamedescription'),
            'rules' => array(
                'required'    => true
601
602
            )
        ),
Nigel McNie's avatar
Nigel McNie committed
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
        'login_password' => array(
            'type'        => 'password',
            'title'       => get_string('password') . ':',
            'description' => get_string('passworddescription'),
            'value'       => '',
            'rules' => array(
                'required'    => true
            )
        ),
        'login_institution' => array(
            'type'         => 'select',
            'title'        => get_string('institution'). ':',
            'defaultvalue' => $defaultinstitution,
            'options'      => $institutions,
            'rules' => array(
                'required' => true
            ),
            'ignore' => count($institutions) == 1
        ),
622
623
        'submit' => array(
            'type'  => 'submit',
Nigel McNie's avatar
Nigel McNie committed
624
            'value' => get_string('login')
Nigel McNie's avatar
Nigel McNie committed
625
        ),
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
    );

    // The login page is completely transient, and it is smart because it
    // remembers the GET and POST data sent to it and resends that on
    // afterwards. 
    $action = '';
    if ($_GET) {
        if (isset($_GET['logout'])) {
            // You can log the user out on any particular page by appending
            // ?logout to the URL. In this case, we don't want the "action"
            // of the url to include that, or be blank, else the next time
            // the user logs in they will be logged out again.
            $action = hsc(substr($_SERVER['REQUEST_URI'], 0, strpos($_SERVER['REQUEST_URI'], '?')));
        } else {
            $action = '?';
            foreach ($_GET as $key => $value) {
                if ($key != 'logout') {
                    $action .= hsc($key) . '=' . hsc($value) . '&amp;';
                }
            }
            $action = substr($action, 0, -5);
        }
    }
    if ($_POST) {
        foreach ($_POST as $key => $value) {
            if (!isset($elements[$key]) && !isset($elements['login']['elements'][$key])) {
                $elements[$key] = array(
                    'type'  => 'hidden',
                    'value' => $value
                );
            }
        }
    }

    $form = array(
661
662
663
664
665
666
667
668
        'name'           => 'login',
        'method'         => 'post',
        'action'         => $action,
        'plugintype'     => 'auth',
        'pluginname'     => 'internal',
        'elements'       => $elements,
        'dieaftersubmit' => false,
        'iscancellable'  => false
669
670
    );

671
    return $form;
672
673
}

Nigel McNie's avatar
Nigel McNie committed
674
675
676
677
678
/**
 * Returns javascript to assist with the rendering of the login forms. The
 * javascript is used to detect whether cookies are enabled, and not show the
 * login form if they are not.
 *
679
680
 * @param string  $form A rendered login form
 * @return string The form with extra javascript added for cookie detection
Nigel McNie's avatar
Nigel McNie committed
681
682
683
684
685
686
687
688
 * @private
 */
function get_login_form_js($form) {
    $form = str_replace('/', '\/', str_replace("'", "\'", (str_replace(array("\n", "\t"), '', $form))));
    $strcookiesnotenabled    = get_string('cookiesnotenabled');
    $cookiename = get_config('cookieprefix') . 'ctest';
    return <<<EOF
<script type="text/javascript">
689
var loginbox = $('loginform_container');
Nigel McNie's avatar
Nigel McNie committed
690
document.cookie = "$cookiename=1";
Nigel McNie's avatar
Nigel McNie committed
691
692
if (document.cookie) {
    loginbox.innerHTML = '$form';
693
    document.cookie = '$cookiename=1;expires=1/1/1990 00:00:00';
Nigel McNie's avatar
Nigel McNie committed
694
695
}
else {
696
    replaceChildNodes(loginbox, P(null, '$strcookiesnotenabled'));
Nigel McNie's avatar
Nigel McNie committed
697
698
699
700
}
</script>
EOF;
}
701

702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735

/**
 * Class to build and cache instances of auth objects
 */
class AuthFactory {

    static $authcache = array();

    /**
     * Take an instanceid and create an auth object for that instance. 
     * 
     * @param  int      $id     The id of the auth instance
     * @return mixed            An intialised auth object or false, if the
     *                          instance doesn't exist (Should never happen)
     */
    public static function create($id) {

        if (isset(self::$authcache[$id]) && is_object(self::$authcache[$id])) {
            return self::$authcache[$id];
        }

        $authinstance = get_record('auth_instance', 'id', $id, null, null, null, null, 'authname');

        if (!empty($authinstance)) {
            $authclassname = 'Auth' . ucfirst($authinstance->authname);
            safe_require('auth', $authinstance->authname);
            self::$authcache[$id] = new $authclassname($id);
            return self::$authcache[$id];
        }

        return false;
    }
}

736
/**
737
 * Called when the login form is submitted. Validates the user and password, and
738
 * if they are valid, starts a new session for the user.
739
 *
740
741
 * @param object $form   The Pieform form object
 * @param array  $values The submitted values
Nigel McNie's avatar
Nigel McNie committed
742
 * @access private
743
 */
744
function login_submit(Pieform $form, $values) {
745
746
    global $SESSION, $USER;

747
748
749
750
751
    $username      = $values['login_username'];
    $password      = $values['login_password'];
    $institution   = (isset($values['login_institution'])) ? $values['login_institution'] : 'mahara';
    $authenticated = false;
    $oldlastlogin  = 0;
Nigel McNie's avatar
Nigel McNie committed
752

753
    try {
754
755
        //var_dump(array($username, $password, $institution, $_SESSION));
        $authenticated = $USER->login($username, $password, $institution);
756

757
758
759
        if (empty($authenticated)) {
            $SESSION->add_error_msg(get_string('loginfailed'));
        }
760

761
762
763
764
765
766
767
768
769
770
    } catch (AuthUnknownUserException $e) {
        try {
            // The user doesn't exist, but maybe the institution wants us to 
            // create users that don't exist
            $institution  = get_record('institution', 'name', $institution);
            if ($institution != false) {
                if ($institution->updateuserinfoonlogin == 0) {
                    // Institution does not want us to create unknown users
                    throw new AuthUnknownUserException("\"$username\" at \"$institution\" is not known");
                }
Nigel McNie's avatar
Nigel McNie committed
771
772
            }

773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
            // Institution says we should create unknown users
            // Get all the auth options for the institution
            $authinstances = get_records_array('auth_instance', 'institution', $institution, 'priority, instancename', 'id, instancename, priority, authname');

            $USER->username    = $username;
            $USER->institution = $institution->name;

            while (list(, $authinstance) = each($authinstances) && false == $authenticated) {
                // TODO: Test this code with an auth plugin that provides a 
                // get_user_info method
                $auth = AuthFactory::create($authinstance->id);
                if ($auth->authenticate_user_account($USER, $password)) {
                    $authenticated = true;
                } else {
                    continue;
                }
789

790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
                $USER->authinstance = $authinstance->id;

                if($auth->authenticate_user_account($username, $password, $institution)) {
                    $userdata = $auth->get_user_info();
                    if (
                         empty($userdata) ||
                         empty($userdata->firstname) ||
                         empty($userdata->lastname) ||
                         empty($userdata->email) 
                        ) {
                        throw new AuthUnknownUserException("\"$username\" at \"$institution\" is not known");
                    } else {
                        // We have the data - create the user
                        $USER->expiry    = db_format_timestamp(time() + 86400);
                        $USER->lastlogin = db_format_timestamp(time());
                        $USER->firstname = $userdata->firstname;
                        $USER->lastname  = $userdata->lastname;
                        $USER->email     = $userdata->email;

                        try {
                            db_begin();
                            $USER->commit();
    
                            handle_event('createuser', $USER);
                            db_commit();
                        } catch (Exception $e) {
                            db_rollback();
                            throw $e;
                        }
                    }
                }
Nigel McNie's avatar
Nigel McNie committed
821
822
            }

823
        } catch (AuthUnknownUserException $e) {
824
            $SESSION->add_error_msg(get_string('loginfailed'));
825
        }
826
827
    } catch (Exception $e) {
        // Unknown Exception!!!
828
        $SESSION->add_error_msg(get_string('loginfailed'));
829
    }
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861

    // Only admins in the admin section!
    if (defined('ADMIN') && !$USER->admin) {
        $SESSION->add_error_msg(get_string('accessforbiddentoadminsection'));
        redirect();
    }

    // Check if the user's account has been deleted
    if ($USER->deleted) {
        die_info(get_string('accountdeleted'));
    }

    // Check if the user's account has expired
    if ($USER->expiry > 0 && time() > $USER->expiry) {
        die_info(get_string('accountexpired'));
    }

    // Check if the user's account has become inactive
    $inactivetime = get_field('institution', 'defaultaccountinactiveexpire', 'name', $USER->institution);
    if ($inactivetime && $oldlastlogin > 0
        && $oldlastlogin + $inactivetime < time()) {
        die_info(get_string('accountinactive'));
    }

    // Check if the user's account has been suspended
    if ($USER->suspendedcusr) {
        die_info(get_string('accountsuspended', 'mahara', $USER->suspendedctime, $USER->suspendedreason));
    }

    // User is allowed to log in
    //$USER->login($userdata);
    auth_check_password_change();
862
863
}

864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
/**
 * Removes registration requests that were not completed in the allowed amount of time
 */
function auth_clean_partial_registrations() {
    $prefix = get_config('dbprefix');
    delete_records_sql('DELETE FROM ' . $prefix . 'usr_registration
        WHERE expiry < ?', array(db_format_timestamp(time())));
}

/**
 * Sends notification e-mails to users in two situations:
 *
 *  - Their account is about to expire. This is controlled by the 'expiry'
 *    field of the usr table. Once that time has passed, the user may not
 *    log in.
 *  - They have not logged in for close to a certain amount of time. If that
 *    amount of time has passed, the user may not log in.
 *
 * The actual prevention of users logging in is handled by the authentication
 * code. This cron job sends e-mails to notify users that these events will
 * happen soon.
 */
function auth_handle_account_expiries() {
    // The 'expiry' flag on the usr table
    $prefix   = get_config('dbprefix');
    $sitename = get_config('sitename');
    $wwwroot  = get_config('wwwroot');

892
    // Expiry warning messages
893
    if ($users = get_records_sql_array('SELECT u.id, u.username, u.firstname, u.lastname, u.preferredname, u.email, i.defaultaccountinactivewarn AS timeout
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
        FROM ' . $prefix . 'usr u, ' . $prefix . 'institution i
        WHERE u.institution = i.name
        AND ? - ' . db_format_tsfield('u.expiry', false) . ' < i.defaultaccountinactivewarn
        AND expirymailsent = 0', array(time()))) {
        foreach ($users as $user) {
            $displayname  = display_name($user);
            $daystoexpire = ceil($user->timeout / 86400) . ' ';
            $daystoexpire .= ($daystoexpire == 1) ? get_string('day') : get_string('days');
            email_user($user, null,
                get_string('accountexpirywarning'),
                get_string('accountexpirywarningtext', 'mahara', $displayname, $sitename, $daystoexpire, $wwwroot . 'contact.php', $sitename),
                get_string('accountexpirywarninghtml', 'mahara', $displayname, $sitename, $daystoexpire, $wwwroot . 'contact.php', $sitename)
            );
            set_field('usr', 'expirymailsent', 1, 'id', $user->id);
        }
    }

911
    // Actual expired users
912
    if ($users = get_records_sql_array('SELECT id
913
        FROM ' . $prefix . 'usr
914
        WHERE ' . db_format_tsfield('expiry', false) . ' < ?', array(time()))) {
915
916
917
918
919
920
        // Users have expired!
        foreach ($users as $user) {
            expire_user($user->id);
        }
    }

921
    // Inactivity (lastlogin is too old)
922
    if ($users = get_records_sql_array('SELECT u.id, u.username, u.firstname, u.lastname, u.preferredname, u.email, i.defaultaccountinactivewarn AS timeout
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
        FROM ' . $prefix . 'usr u, ' . $prefix . 'institution i
        WHERE u.institution = i.name
        AND (? - ' . db_format_tsfield('u.lastlogin', false) . ') > (i.defaultaccountinactiveexpire - i.defaultaccountinactivewarn)
        AND inactivemailsent = 0', array(time()))) {
        foreach ($users as $user) {
            $displayname = display_name($user);
            $daystoinactive = ceil($user->timeout / 86400) . ' ';
            $daystoinactive .= ($daystoexpire == 1) ? get_string('day') : get_string('days');
            email_user($user, null, get_string('accountinactivewarning'),
                get_string('accountinactivewarningtext', 'mahara', $displayname, $sitename, $daystoinactive, $sitename),
                get_string('accountinactivewarninghtml', 'mahara', $displayname, $sitename, $daystoinactive, $sitename)
            );
            set_field('usr', 'inactivemailsent', 1, 'id', $user->id);
        }
    }
938
939
940
    
    // Actual inactive users
    if ($users = get_records_sql_array('SELECT u.id
Nigel McNie's avatar
Nigel McNie committed
941
        FROM ' . $prefix . 'usr u
942
        LEFT JOIN ' . $prefix . 'institution i ON (u.institution = i.name)
943
        WHERE ' . db_format_tsfield('lastlogin', false) . ' < ? - i.defaultaccountinactiveexpire', array(time()))) {
944
945
946
947
948
        // Users have become inactive!
        foreach ($users as $user) {
            deactivate_user($user->id);
        }
    }
949
950
}

Martyn Smith's avatar
Martyn Smith committed
951
function auth_generate_login_form() {
Nigel McNie's avatar
Nigel McNie committed
952
953
954
    if (!get_config('installed')) {
        return;
    }
Martyn Smith's avatar
Martyn Smith committed
955
956
957
958
959
960
961
962
963
964
965
966
967
    require_once('pieforms/pieform.php');
    $institutions = get_records_menu('institution', '', '', 'name, displayname');
    $defaultinstitution = get_cookie('institution');
    if (!$defaultinstitution) {
        $defaultinstitution = 'mahara';
    }
    $loginform = get_login_form_js(pieform(array(
        'name'       => 'login',
        'renderer'   => 'div',
        'submit'     => false,
        'plugintype' => 'auth',
        'pluginname' => 'internal',
        'elements'   => array(
968
969
970
971
972
973
            'login_username' => array(
                'type'        => 'text',
                'title'       => get_string('username') . ':',
                'description' => get_string('usernamedescription'),
                'rules' => array(
                    'required'    => true
Martyn Smith's avatar
Martyn Smith committed
974
975
                )
            ),
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
            'login_password' => array(
                'type'        => 'password',
                'title'       => get_string('password') . ':',
                'description' => get_string('passworddescription'),
                'value'       => '',
                'rules' => array(
                    'required'    => true
                )
            ),
            'login_institution' => array(
                'type' => 'select',
                'title' => get_string('institution') . ':',
                'defaultvalue' => $defaultinstitution,
                'options' => $institutions,
                'rules' => array(
                    'required' => true
                ),
                'ignore' => count($institutions) == 1,
                'help' => true,
            ),
Martyn Smith's avatar
Martyn Smith committed
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
            'submit' => array(
                'type'  => 'submit',
                'value' => get_string('login')
            ),
            'register' => array(
                'value' => '<div><a href="' . get_config('wwwroot') . 'register.php" tabindex="2">' . get_string('register') . '</a>'
                    . '<br><a href="' . get_config('wwwroot') . 'forgotpass.php" tabindex="2">' . get_string('passwordreminder') . '</a></div>'
            )
        )
    )));

    return $loginform;
}

1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
/**
 * Given a form, an array of values with 'password1' and 'password2'
 * indices and a user, validate that the user can change their password to
 * the one in $values.
 *
 * This provides one place where validation of passwords can be done. This is
 * used by:
 *  - registration
 *  - user forgot password
 *  - user changing password on their account page
 *  - user forced to change their password by the <kbd>passwordchange</kbd>
 *    flag on the <kbd>usr</kbd> table.
 *
 * The password is checked for:
 *  - Being in valid form according to the rules of the authentication method
 *    for the user
 *  - Not being an easy password (a blacklist of strings, NOT a length check or
 *     similar), including being the user's username
 *  - Both values being equal
 *
 * @param Pieform $form         The form to validate
 * @param array $values         The values passed through
 * @param string $authplugin    The authentication plugin that the user uses
 */
function password_validate(Pieform $form, $values, $username, $institution) {

    $authinstances  = auth_get_auth_instances_for_institution($institution);
    
    // If there's only one auth instance, and it's 'internal' then we use it to
    // validate the password. This was a requirement of the original spec, so 
    // even though this code is... strange... it's still here.
    if (1 == count($authinstances) && $authinstances[0]->authname == 'internal') {
        $authobj = AuthFactory::create($authinstances[0]->id);
        safe_require('auth', 'internal');
        $authobj = new AuthInternal($authinstances[0]->id);

        if (!$form->get_error('password1') && !$authobj->is_password_valid($values['password1'])) {
            $form->set_error('password1', get_string('passwordinvalidform', "auth.$authtype"));
        }
    }

    $suckypasswords = array(
        'mahara', 'password', $username
    );

    if (!$form->get_error('password1') && in_array($values['password1'], $suckypasswords)) {
        $form->set_error('password1', get_string('passwordtooeasy'));
    }

    if (!$form->get_error('password1') && $values['password1'] != $values['password2']) {
        $form->set_error('password2', get_string('passwordsdonotmatch'));
    }

1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
    // No Mike, that's a _BAD_ Mike! :)
    if ($values['password1'] == 'mike01' || $values['password1'] == 'mike012') {
        if (!$form->get_property('jsform')) {
            die_info('<img src="'
                . theme_get_url('images/sidebox1_corner_botright.gif')
                . '" alt="(C) 2007 MSS Enterprises"></p>');
        }
    }
}

/**
 * Given a form, an array of values with 'password1' and 'password2'
 * indices and a user, validate that the user can change their password to
 * the one in $values.
 *
 * This provides one place where validation of passwords can be done. This is
 * used by:
 *  - registration
 *  - user forgot password
 *  - user changing password on their account page
 *  - user forced to change their password by the <kbd>passwordchange</kbd>
 *    flag on the <kbd>usr</kbd> table.
 *
 * The password is checked for:
 *  - Being in valid form according to the rules of the authentication method
 *    for the user
 *  - Not being an easy password (a blacklist of strings, NOT a length check or
 *     similar), including being the user's username
 *  - Both values being equal
 *
 * @param Pieform $form         The form to validate
 * @param array $values         The values passed through
 * @param string $authplugin    The authentication plugin that the user uses
 */
function password_validate_user(Pieform $form, $values, User $user) {

    $authobj = AuthFactory::create($user->authinstance);

    if (!$form->get_error('password1') && !$authobj->is_password_valid($values['password1'])) {
        $form->set_error('password1', get_string('passwordinvalidform', "auth.$authobj->type"));
    }

    $suckypasswords = array(
        'mahara', 'password', $user->username
    );

    if (!$form->get_error('password1') && in_array($values['password1'], $suckypasswords)) {
        $form->set_error('password1', get_string('passwordtooeasy'));
    }

    if (!$form->get_error('password1') && $values['password1'] != $values['password2']) {
        $form->set_error('password2', get_string('passwordsdonotmatch'));
    }

1117
1118
1119
1120
1121
1122
1123
1124
1125
    // No Mike, that's a _BAD_ Mike! :)
    if ($values['password1'] == 'mike01' || $values['password1'] == 'mike012') {
        if (!$form->get_property('jsform')) {
            die_info('<img src="'
                . theme_get_url('images/sidebox1_corner_botright.gif')
                . '" alt="(C) 2007 MSS Enterprises"></p>');
        }
    }
}
1126
1127
1128
1129

class PluginAuth extends Plugin {

    public static function get_event_subscriptions() {
1130
1131
        $subscriptions = array();

1132
1133
        $activecheck = new StdClass;
        $activecheck->plugin = 'internal';
1134
        $activecheck->event  = 'suspenduser';
1135
        $activecheck->callfunction = 'update_active_flag';
1136
        $subscriptions[] = clone $activecheck;
1137
        $activecheck->event = 'unsuspenduser';
1138
        $subscriptions[] = clone $activecheck;
1139
        $activecheck->event = 'deleteuser';
1140
        $subscriptions[] = clone $activecheck;
1141
        $activecheck->event = 'undeleteuser';
1142
        $subscriptions[] = clone $activecheck;
1143
        $activecheck->event = 'expireuser';
1144
        $subscriptions[] = clone $activecheck;
1145
        $activecheck->event = 'unexpireuser';
1146
        $subscriptions[] = clone $activecheck;
1147
        $activecheck->event = 'deactivateuser';
1148
        $subscriptions[] = clone $activecheck;
1149
        $activecheck->event = 'activateuser';
1150
        $subscriptions[] = clone $activecheck;
1151
1152

        return $subscriptions;
1153
1154
    }

1155
    public static function update_active_flag($event, $user) {
1156
1157
        $active = true;

1158
1159
        // ensure we have everything we need
        $user = get_user($user['id']);
1160
1161
1162
1163
1164

        $inactivetime = get_field('institution', 'defaultaccountinactiveexpire', 'name', $user->institution);
        if ($user->suspendedcusr) {
            $active = false;
        }
1165
        else if ($user->expiry && $user->expiry < time()) {
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
            $active = false;
        }
        else if ($inactivetime && $user->lastlogin + $inactivetime < time()) {
            $active = false;
        }
        else if ($user->deleted) {
            $active = false;
        }

        if ($active != $user->active) {
1176
            set_field('usr', 'active', (int)$active, 'id', $user->id);
1177
        }
1178
1179
1180
1181
    }

}

1182
?>