[Summary view]

Differences Between: [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 and 403]

   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) or ($CFG->rememberusername == 2 and empty($frm->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();