login/index.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Main login page.
  20  *
  21  * @package    core
  22  * @subpackage auth
  23  * @copyright  1999 onwards Martin Dougiamas  http://dougiamas.com
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 require('../config.php');
  28 require_once('lib.php');
  29
  30 redirect_if_major_upgrade_required();
  31
  32 $testsession = optional_param('testsession', 0, PARAM_INT); // test session works properly
  33 $anchor      = optional_param('anchor', '', PARAM_RAW);     // Used to restore hash anchor to wantsurl.
  34
  35 $resendconfirmemail = optional_param('resendconfirmemail', false, PARAM_BOOL);
  36
  37 // It might be safe to do this for non-Behat sites, or there might
  38 // be a security risk. For now we only allow it on Behat sites.
  39 // If you wants to do the analysis, you may be able to remove the
  40 // if (BEHAT_SITE_RUNNING).
  41 if (defined('BEHAT_SITE_RUNNING') && BEHAT_SITE_RUNNING) {
  42     $wantsurl    = optional_param('wantsurl', '', PARAM_LOCALURL);   // Overrides $SESSION->wantsurl if given.
  43     if ($wantsurl !== '') {
  44         $SESSION->wantsurl = (new moodle_url($wantsurl))->out(false);
  45     }
  46 }
  47
  48 $context = context_system::instance();
  49 $PAGE->set_url("$CFG->wwwroot/login/index.php");
  50 $PAGE->set_context($context);
  51 $PAGE->set_pagelayout('login');
  52
  53 /// Initialize variables
  54 $errormsg = '';
  55 $errorcode = 0;
  56
  57 // login page requested session test
  58 if ($testsession) {
  59     if ($testsession == $USER->id) {
  60         if (isset($SESSION->wantsurl)) {
  61             $urltogo = $SESSION->wantsurl;
  62         } else {
  63             $urltogo = $CFG->wwwroot.'/';
  64         }
  65         unset($SESSION->wantsurl);
  66         redirect($urltogo);
  67     } else {
  68         // TODO: try to find out what is the exact reason why sessions do not work
  69         $errormsg = get_string("cookiesnotenabled");
  70         $errorcode = 1;
  71     }
  72 }
  73
  74 /// Check for timed out sessions
  75 if (!empty($SESSION->has_timed_out)) {
  76     $session_has_timed_out = true;
  77     unset($SESSION->has_timed_out);
  78 } else {
  79     $session_has_timed_out = false;
  80 }
  81
  82 $frm  = false;
  83 $user = false;
  84
  85 $authsequence = get_enabled_auth_plugins(); // Auths, in sequence.
  86 foreach($authsequence as $authname) {
  87     $authplugin = get_auth_plugin($authname);
  88     // The auth plugin's loginpage_hook() can eventually set $frm and/or $user.
  89     $authplugin->loginpage_hook();
  90 }
  91
  92
  93 /// Define variables used in page
  94 $site = get_site();
  95
  96 // Ignore any active pages in the navigation/settings.
  97 // We do this because there won't be an active page there, and by ignoring the active pages the
  98 // navigation and settings won't be initialised unless something else needs them.
  99 $PAGE->navbar->ignore_active();
 100 $loginsite = get_string("loginsite");
 101 $PAGE->navbar->add($loginsite);
 102
 103 if ($user !== false or $frm !== false or $errormsg !== '') {
 104     // some auth plugin already supplied full user, fake form data or prevented user login with error message
 105
 106 } else if (!empty($SESSION->wantsurl) && file_exists($CFG->dirroot.'/login/weblinkauth.php')) {
 107     // Handles the case of another Moodle site linking into a page on this site
 108     //TODO: move weblink into own auth plugin
 109     include($CFG->dirroot.'/login/weblinkauth.php');
 110     if (function_exists('weblink_auth')) {
 111         $user = weblink_auth($SESSION->wantsurl);
 112     }
 113     if ($user) {
 114         $frm->username = $user->username;
 115     } else {
 116         $frm = data_submitted();
 117     }
 118
 119 } else {
 120     $frm = data_submitted();
 121 }
 122
 123 // Restore the #anchor to the original wantsurl. Note that this
 124 // will only work for internal auth plugins, SSO plugins such as
 125 // SAML / CAS / OIDC will have to handle this correctly directly.
 126 if ($anchor && isset($SESSION->wantsurl) && strpos($SESSION->wantsurl, '#') === false) {
 127     $wantsurl = new moodle_url($SESSION->wantsurl);
 128     $wantsurl->set_anchor(substr($anchor, 1));
 129     $SESSION->wantsurl = $wantsurl->out();
 130 }
 131
 132 /// Check if the user has actually submitted login data to us
 133
 134 if ($frm and isset($frm->username)) {                             // Login WITH cookies
 135
 136     $frm->username = trim(core_text::strtolower($frm->username));
 137
 138     if (is_enabled_auth('none') ) {
 139         if ($frm->username !== core_user::clean_field($frm->username, 'username')) {
 140             $errormsg = get_string('username').': '.get_string("invalidusername");
 141             $errorcode = 2;
 142             $user = null;
 143         }
 144     }
 145
 146     if ($user) {
 147         // The auth plugin has already provided the user via the loginpage_hook() called above.
 148     } else if (($frm->username == 'guest') and empty($CFG->guestloginbutton)) {
 149         $user = false;    /// Can't log in as guest if guest button is disabled
 150         $frm = false;
 151     } else {
 152         if (empty($errormsg)) {
 153             $logintoken = isset($frm->logintoken) ? $frm->logintoken : '';
 154             $user = authenticate_user_login($frm->username, $frm->password, false, $errorcode, $logintoken);
 155         }
 156     }
 157
 158     // Intercept 'restored' users to provide them with info & reset password
 159     if (!$user and $frm and is_restored_user($frm->username)) {
 160         $PAGE->set_title(get_string('restoredaccount'));
 161         $PAGE->set_heading($site->fullname);
 162         echo $OUTPUT->header();
 163         echo $OUTPUT->heading(get_string('restoredaccount'));
 164         echo $OUTPUT->box(get_string('restoredaccountinfo'), 'generalbox boxaligncenter');
 165         require_once('restored_password_form.php'); // Use our "supplanter" login_forgot_password_form. MDL-20846
 166         $form = new login_forgot_password_form('forgot_password.php', array('username' => $frm->username));
 167         $form->display();
 168         echo $OUTPUT->footer();
 169         die;
 170     }
 171
 172     if ($user) {
 173
 174         // language setup
 175         if (isguestuser($user)) {
 176             // no predefined language for guests - use existing session or default site lang
 177             unset($user->lang);
 178
 179         } else if (!empty($user->lang)) {
 180             // unset previous session language - use user preference instead
 181             unset($SESSION->lang);
 182         }
 183
 184         if (empty($user->confirmed)) {       // This account was never confirmed
 185             $PAGE->set_title(get_string("mustconfirm"));
 186             $PAGE->set_heading($site->fullname);
 187             echo $OUTPUT->header();
 188             echo $OUTPUT->heading(get_string("mustconfirm"));
 189             if ($resendconfirmemail) {
 190                 if (!send_confirmation_email($user)) {
 191                     echo $OUTPUT->notification(get_string('emailconfirmsentfailure'), \core\output\notification::NOTIFY_ERROR);
 192                 } else {
 193                     echo $OUTPUT->notification(get_string('emailconfirmsentsuccess'), \core\output\notification::NOTIFY_SUCCESS);
 194                 }
 195             }
 196             echo $OUTPUT->box(get_string("emailconfirmsent", "", s($user->email)), "generalbox boxaligncenter");
 197             $resendconfirmurl = new moodle_url('/login/index.php',
 198                 [
 199                     'username' => $frm->username,
 200                     'password' => $frm->password,
 201                     'resendconfirmemail' => true,
 202                     'logintoken' => \core\session\manager::get_login_token()
 203                 ]
 204             );
 205             echo $OUTPUT->single_button($resendconfirmurl, get_string('emailconfirmationresend'));
 206             echo $OUTPUT->footer();
 207             die;
 208         }
 209
 210     /// Let's get them all set up.
 211         complete_user_login($user);
 212
 213         \core\session\manager::apply_concurrent_login_limit($user->id, session_id());
 214
 215         // sets the username cookie
 216         if (!empty($CFG->nolastloggedin)) {
 217             // do not store last logged in user in cookie
 218             // auth plugins can temporarily override this from loginpage_hook()
 219             // do not save $CFG->nolastloggedin in database!
 220
 221         } else if (empty($CFG->rememberusername)) {
 222             // no permanent cookies, delete old one if exists
 223             set_moodle_cookie('');
 224
 225         } else {
 226             set_moodle_cookie($USER->username);
 227         }
 228
 229         $urltogo = core_login_get_return_url();
 230
 231     /// check if user password has expired
 232     /// Currently supported only for ldap-authentication module
 233         $userauth = get_auth_plugin($USER->auth);
 234         if (!isguestuser() and !empty($userauth->config->expiration) and $userauth->config->expiration == 1) {
 235             $externalchangepassword = false;
 236             if ($userauth->can_change_password()) {
 237                 $passwordchangeurl = $userauth->change_password_url();
 238                 if (!$passwordchangeurl) {
 239                     $passwordchangeurl = $CFG->wwwroot.'/login/change_password.php';
 240                 } else {
 241                     $externalchangepassword = true;
 242                 }
 243             } else {
 244                 $passwordchangeurl = $CFG->wwwroot.'/login/change_password.php';
 245             }
 246             $days2expire = $userauth->password_expire($USER->username);
 247             $PAGE->set_title("$site->fullname: $loginsite");
 248             $PAGE->set_heading("$site->fullname");
 249             if (intval($days2expire) > 0 && intval($days2expire) < intval($userauth->config->expiration_warning)) {
 250                 echo $OUTPUT->header();
 251                 echo $OUTPUT->confirm(get_string('auth_passwordwillexpire', 'auth', $days2expire), $passwordchangeurl, $urltogo);
 252                 echo $OUTPUT->footer();
 253                 exit;
 254             } elseif (intval($days2expire) < 0 ) {
 255                 if ($externalchangepassword) {
 256                     // We end the session if the change password form is external. This prevents access to the site
 257                     // until the password is correctly changed.
 258                     require_logout();
 259                 } else {
 260                     // If we use the standard change password form, this user preference will be reset when the password
 261                     // is changed. Until then it will prevent access to the site.
 262                     set_user_preference('auth_forcepasswordchange', 1, $USER);
 263                 }
 264                 echo $OUTPUT->header();
 265                 echo $OUTPUT->confirm(get_string('auth_passwordisexpired', 'auth'), $passwordchangeurl, $urltogo);
 266                 echo $OUTPUT->footer();
 267                 exit;
 268             }
 269         }
 270
 271         // Discard any errors before the last redirect.
 272         unset($SESSION->loginerrormsg);
 273
 274         // test the session actually works by redirecting to self
 275         $SESSION->wantsurl = $urltogo;
 276         redirect(new moodle_url(get_login_url(), array('testsession'=>$USER->id)));
 277
 278     } else {
 279         if (empty($errormsg)) {
 280             if ($errorcode == AUTH_LOGIN_UNAUTHORISED) {
 281                 $errormsg = get_string("unauthorisedlogin", "", $frm->username);
 282             } else {
 283                 $errormsg = get_string("invalidlogin");
 284                 $errorcode = 3;
 285             }
 286         }
 287     }
 288 }
 289
 290 /// Detect problems with timedout sessions
 291 if ($session_has_timed_out and !data_submitted()) {
 292     $errormsg = get_string('sessionerroruser', 'error');
 293     $errorcode = 4;
 294 }
 295
 296 /// First, let's remember where the user was trying to get to before they got here
 297
 298 if (empty($SESSION->wantsurl)) {
 299     $SESSION->wantsurl = null;
 300     $referer = get_local_referer(false);
 301     if ($referer &&
 302             $referer != $CFG->wwwroot &&
 303             $referer != $CFG->wwwroot . '/' &&
 304             $referer != $CFG->wwwroot . '/login/' &&
 305             strpos($referer, $CFG->wwwroot . '/login/?') !== 0 &&
 306             strpos($referer, $CFG->wwwroot . '/login/index.php') !== 0) { // There might be some extra params such as ?lang=.
 307         $SESSION->wantsurl = $referer;
 308     }
 309 }
 310
 311 /// Redirect to alternative login URL if needed
 312 if (!empty($CFG->alternateloginurl)) {
 313     $loginurl = new moodle_url($CFG->alternateloginurl);
 314
 315     $loginurlstr = $loginurl->out(false);
 316
 317     if (strpos($SESSION->wantsurl, $loginurlstr) === 0) {
 318         // We do not want to return to alternate url.
 319         $SESSION->wantsurl = null;
 320     }
 321
 322     // If error code then add that to url.
 323     if ($errorcode) {
 324         $loginurl->param('errorcode', $errorcode);
 325     }
 326
 327     redirect($loginurl->out(false));
 328 }
 329
 330 /// Generate the login page with forms
 331
 332 if (!isset($frm) or !is_object($frm)) {
 333     $frm = new stdClass();
 334 }
 335
 336 if (empty($frm->username) && $authsequence[0] != 'shibboleth') {  // See bug 5184
 337     if (!empty($_GET["username"])) {
 338         // we do not want data from _POST here
 339         $frm->username = clean_param($_GET["username"], PARAM_RAW); // we do not want data from _POST here
 340     } else {
 341         $frm->username = get_moodle_cookie();
 342     }
 343
 344     $frm->password = "";
 345 }
 346
 347 if (!empty($SESSION->loginerrormsg)) {
 348     // We had some errors before redirect, show them now.
 349     $errormsg = $SESSION->loginerrormsg;
 350     unset($SESSION->loginerrormsg);
 351
 352 } else if ($testsession) {
 353     // No need to redirect here.
 354     unset($SESSION->loginerrormsg);
 355
 356 } else if ($errormsg or !empty($frm->password)) {
 357     // We must redirect after every password submission.
 358     if ($errormsg) {
 359         $SESSION->loginerrormsg = $errormsg;
 360     }
 361     redirect(new moodle_url('/login/index.php'));
 362 }
 363
 364 $PAGE->set_title("$site->fullname: $loginsite");
 365 $PAGE->set_heading("$site->fullname");
 366
 367 echo $OUTPUT->header();
 368
 369 if (isloggedin() and !isguestuser()) {
 370     // prevent logging when already logged in, we do not want them to relogin by accident because sesskey would be changed
 371     echo $OUTPUT->box_start();
 372     $logout = new single_button(new moodle_url('/login/logout.php', array('sesskey'=>sesskey(),'loginpage'=>1)), get_string('logout'), 'post');
 373     $continue = new single_button(new moodle_url('/'), get_string('cancel'), 'get');
 374     echo $OUTPUT->confirm(get_string('alreadyloggedin', 'error', fullname($USER)), $logout, $continue);
 375     echo $OUTPUT->box_end();
 376 } else {
 377     $loginform = new \core_auth\output\login($authsequence, $frm->username);
 378     $loginform->set_error($errormsg);
 379     echo $OUTPUT->render($loginform);
 380 }
 381
 382 echo $OUTPUT->footer();