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