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   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  // Try to prevent searching for sites that allow sign-up.
  31  if (!isset($CFG->additionalhtmlhead)) {
  32      $CFG->additionalhtmlhead = '';
  33  }
  34  $CFG->additionalhtmlhead .= '<meta name="robots" content="noindex" />';
  35  
  36  redirect_if_major_upgrade_required();
  37  
  38  $testsession = optional_param('testsession', 0, PARAM_INT); // test session works properly
  39  $cancel      = optional_param('cancel', 0, PARAM_BOOL);      // redirect to frontpage, needed for loginhttps
  40  $anchor      = optional_param('anchor', '', PARAM_RAW);      // Used to restore hash anchor to wantsurl.
  41  
  42  if ($cancel) {
  43      redirect(new moodle_url('/'));
  44  }
  45  
  46  //HTTPS is required in this page when $CFG->loginhttps enabled
  47  $PAGE->https_required();
  48  
  49  $context = context_system::instance();
  50  $PAGE->set_url("$CFG->httpswwwroot/login/index.php");
  51  $PAGE->set_context($context);
  52  $PAGE->set_pagelayout('login');
  53  
  54  /// Initialize variables
  55  $errormsg = '';
  56  $errorcode = 0;
  57  
  58  // login page requested session test
  59  if ($testsession) {
  60      if ($testsession == $USER->id) {
  61          if (isset($SESSION->wantsurl)) {
  62              $urltogo = $SESSION->wantsurl;
  63          } else {
  64              $urltogo = $CFG->wwwroot.'/';
  65          }
  66          unset($SESSION->wantsurl);
  67          redirect($urltogo);
  68      } else {
  69          // TODO: try to find out what is the exact reason why sessions do not work
  70          $errormsg = get_string("cookiesnotenabled");
  71          $errorcode = 1;
  72      }
  73  }
  74  
  75  /// Check for timed out sessions
  76  if (!empty($SESSION->has_timed_out)) {
  77      $session_has_timed_out = true;
  78      unset($SESSION->has_timed_out);
  79  } else {
  80      $session_has_timed_out = false;
  81  }
  82  
  83  /// auth plugins may override these - SSO anyone?
  84  $frm  = false;
  85  $user = false;
  86  
  87  $authsequence = get_enabled_auth_plugins(true); // auths, in sequence
  88  foreach($authsequence as $authname) {
  89      $authplugin = get_auth_plugin($authname);
  90      $authplugin->loginpage_hook();
  91  }
  92  
  93  
  94  /// Define variables used in page
  95  $site = get_site();
  96  
  97  // Ignore any active pages in the navigation/settings.
  98  // We do this because there won't be an active page there, and by ignoring the active pages the
  99  // navigation and settings won't be initialised unless something else needs them.
 100  $PAGE->navbar->ignore_active();
 101  $loginsite = get_string("loginsite");
 102  $PAGE->navbar->add($loginsite);
 103  
 104  if ($user !== false or $frm !== false or $errormsg !== '') {
 105      // some auth plugin already supplied full user, fake form data or prevented user login with error message
 106  
 107  } else if (!empty($SESSION->wantsurl) && file_exists($CFG->dirroot.'/login/weblinkauth.php')) {
 108      // Handles the case of another Moodle site linking into a page on this site
 109      //TODO: move weblink into own auth plugin
 110      include($CFG->dirroot.'/login/weblinkauth.php');
 111      if (function_exists('weblink_auth')) {
 112          $user = weblink_auth($SESSION->wantsurl);
 113      }
 114      if ($user) {
 115          $frm->username = $user->username;
 116      } else {
 117          $frm = data_submitted();
 118      }
 119  
 120  } else {
 121      $frm = data_submitted();
 122  }
 123  
 124  // Restore the #anchor to the original wantsurl. Note that this
 125  // will only work for internal auth plugins, SSO plugins such as
 126  // SAML / CAS / OIDC will have to handle this correctly directly.
 127  if ($anchor && isset($SESSION->wantsurl) && strpos($SESSION->wantsurl, '#') === false) {
 128      $wantsurl = new moodle_url($SESSION->wantsurl);
 129      $wantsurl->set_anchor(substr($anchor, 1));
 130      $SESSION->wantsurl = $wantsurl->out();
 131  }
 132  
 133  /// Check if the user has actually submitted login data to us
 134  
 135  if ($frm and isset($frm->username)) {                             // Login WITH cookies
 136  
 137      $frm->username = trim(core_text::strtolower($frm->username));
 138  
 139      if (is_enabled_auth('none') ) {
 140          if ($frm->username !== core_user::clean_field($frm->username, 'username')) {
 141              $errormsg = get_string('username').': '.get_string("invalidusername");
 142              $errorcode = 2;
 143              $user = null;
 144          }
 145      }
 146  
 147      if ($user) {
 148          //user already supplied by aut plugin prelogin hook
 149      } else if (($frm->username == 'guest') and empty($CFG->guestloginbutton)) {
 150          $user = false;    /// Can't log in as guest if guest button is disabled
 151          $frm = false;
 152      } else {
 153          if (empty($errormsg)) {
 154              $user = authenticate_user_login($frm->username, $frm->password, false, $errorcode);
 155          }
 156      }
 157  
 158      // Intercept 'restored' users to provide them with info & reset password
 159      if (!$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              echo $OUTPUT->box(get_string("emailconfirmsent", "", $user->email), "generalbox boxaligncenter");
 190              echo $OUTPUT->footer();
 191              die;
 192          }
 193  
 194      /// Let's get them all set up.
 195          complete_user_login($user);
 196  
 197          \core\session\manager::apply_concurrent_login_limit($user->id, session_id());
 198  
 199          // sets the username cookie
 200          if (!empty($CFG->nolastloggedin)) {
 201              // do not store last logged in user in cookie
 202              // auth plugins can temporarily override this from loginpage_hook()
 203              // do not save $CFG->nolastloggedin in database!
 204  
 205          } else if (empty($CFG->rememberusername) or ($CFG->rememberusername == 2 and empty($frm->rememberusername))) {
 206              // no permanent cookies, delete old one if exists
 207              set_moodle_cookie('');
 208  
 209          } else {
 210              set_moodle_cookie($USER->username);
 211          }
 212  
 213          $urltogo = core_login_get_return_url();
 214  
 215      /// check if user password has expired
 216      /// Currently supported only for ldap-authentication module
 217          $userauth = get_auth_plugin($USER->auth);
 218          if (!isguestuser() and !empty($userauth->config->expiration) and $userauth->config->expiration == 1) {
 219              if ($userauth->can_change_password()) {
 220                  $passwordchangeurl = $userauth->change_password_url();
 221                  if (!$passwordchangeurl) {
 222                      $passwordchangeurl = $CFG->httpswwwroot.'/login/change_password.php';
 223                  }
 224              } else {
 225                  $passwordchangeurl = $CFG->httpswwwroot.'/login/change_password.php';
 226              }
 227              $days2expire = $userauth->password_expire($USER->username);
 228              $PAGE->set_title("$site->fullname: $loginsite");
 229              $PAGE->set_heading("$site->fullname");
 230              if (intval($days2expire) > 0 && intval($days2expire) < intval($userauth->config->expiration_warning)) {
 231                  echo $OUTPUT->header();
 232                  echo $OUTPUT->confirm(get_string('auth_passwordwillexpire', 'auth', $days2expire), $passwordchangeurl, $urltogo);
 233                  echo $OUTPUT->footer();
 234                  exit;
 235              } elseif (intval($days2expire) < 0 ) {
 236                  echo $OUTPUT->header();
 237                  echo $OUTPUT->confirm(get_string('auth_passwordisexpired', 'auth'), $passwordchangeurl, $urltogo);
 238                  echo $OUTPUT->footer();
 239                  exit;
 240              }
 241          }
 242  
 243          // Discard any errors before the last redirect.
 244          unset($SESSION->loginerrormsg);
 245  
 246          // test the session actually works by redirecting to self
 247          $SESSION->wantsurl = $urltogo;
 248          redirect(new moodle_url(get_login_url(), array('testsession'=>$USER->id)));
 249  
 250      } else {
 251          if (empty($errormsg)) {
 252              if ($errorcode == AUTH_LOGIN_UNAUTHORISED) {
 253                  $errormsg = get_string("unauthorisedlogin", "", $frm->username);
 254              } else {
 255                  $errormsg = get_string("invalidlogin");
 256                  $errorcode = 3;
 257              }
 258          }
 259      }
 260  }
 261  
 262  /// Detect problems with timedout sessions
 263  if ($session_has_timed_out and !data_submitted()) {
 264      $errormsg = get_string('sessionerroruser', 'error');
 265      $errorcode = 4;
 266  }
 267  
 268  /// First, let's remember where the user was trying to get to before they got here
 269  
 270  if (empty($SESSION->wantsurl)) {
 271      $SESSION->wantsurl = null;
 272      $referer = get_local_referer(false);
 273      if ($referer &&
 274              $referer != $CFG->wwwroot &&
 275              $referer != $CFG->wwwroot . '/' &&
 276              $referer != $CFG->httpswwwroot . '/login/' &&
 277              strpos($referer, $CFG->httpswwwroot . '/login/?') !== 0 &&
 278              strpos($referer, $CFG->httpswwwroot . '/login/index.php') !== 0) { // There might be some extra params such as ?lang=.
 279          $SESSION->wantsurl = $referer;
 280      }
 281  }
 282  
 283  /// Redirect to alternative login URL if needed
 284  if (!empty($CFG->alternateloginurl)) {
 285      $loginurl = $CFG->alternateloginurl;
 286  
 287      if (strpos($SESSION->wantsurl, $loginurl) === 0) {
 288          //we do not want to return to alternate url
 289          $SESSION->wantsurl = NULL;
 290      }
 291  
 292      if ($errorcode) {
 293          if (strpos($loginurl, '?') === false) {
 294              $loginurl .= '?';
 295          } else {
 296              $loginurl .= '&';
 297          }
 298          $loginurl .= 'errorcode='.$errorcode;
 299      }
 300  
 301      redirect($loginurl);
 302  }
 303  
 304  // make sure we really are on the https page when https login required
 305  $PAGE->verify_https_required();
 306  
 307  /// Generate the login page with forms
 308  
 309  if (!isset($frm) or !is_object($frm)) {
 310      $frm = new stdClass();
 311  }
 312  
 313  if (empty($frm->username) && $authsequence[0] != 'shibboleth') {  // See bug 5184
 314      if (!empty($_GET["username"])) {
 315          // we do not want data from _POST here
 316          $frm->username = clean_param($_GET["username"], PARAM_RAW); // we do not want data from _POST here
 317      } else {
 318          $frm->username = get_moodle_cookie();
 319      }
 320  
 321      $frm->password = "";
 322  }
 323  
 324  if (!empty($frm->username)) {
 325      $focus = "password";
 326  } else {
 327      $focus = "username";
 328  }
 329  
 330  if (!empty($CFG->registerauth) or is_enabled_auth('none') or !empty($CFG->auth_instructions)) {
 331      $show_instructions = true;
 332  } else {
 333      $show_instructions = false;
 334  }
 335  
 336  $potentialidps = array();
 337  foreach($authsequence as $authname) {
 338      $authplugin = get_auth_plugin($authname);
 339      $potentialidps = array_merge($potentialidps, $authplugin->loginpage_idp_list($SESSION->wantsurl));
 340  }
 341  
 342  if (!empty($SESSION->loginerrormsg)) {
 343      // We had some errors before redirect, show them now.
 344      $errormsg = $SESSION->loginerrormsg;
 345      unset($SESSION->loginerrormsg);
 346  
 347  } else if ($testsession) {
 348      // No need to redirect here.
 349      unset($SESSION->loginerrormsg);
 350  
 351  } else if ($errormsg or !empty($frm->password)) {
 352      // We must redirect after every password submission.
 353      if ($errormsg) {
 354          $SESSION->loginerrormsg = $errormsg;
 355      }
 356      redirect(new moodle_url($CFG->httpswwwroot . '/login/index.php'));
 357  }
 358  
 359  $PAGE->set_title("$site->fullname: $loginsite");
 360  $PAGE->set_heading("$site->fullname");
 361  
 362  echo $OUTPUT->header();
 363  
 364  if (isloggedin() and !isguestuser()) {
 365      // prevent logging when already logged in, we do not want them to relogin by accident because sesskey would be changed
 366      echo $OUTPUT->box_start();
 367      $logout = new single_button(new moodle_url($CFG->httpswwwroot.'/login/logout.php', array('sesskey'=>sesskey(),'loginpage'=>1)), get_string('logout'), 'post');
 368      $continue = new single_button(new moodle_url($CFG->httpswwwroot.'/login/index.php', array('cancel'=>1)), get_string('cancel'), 'get');
 369      echo $OUTPUT->confirm(get_string('alreadyloggedin', 'error', fullname($USER)), $logout, $continue);
 370      echo $OUTPUT->box_end();
 371  } else {
 372      include ("index_form.html");
 373      if ($errormsg) {
 374          $PAGE->requires->js_init_call('M.util.focus_login_error', null, true);
 375      } else if (!empty($CFG->loginpageautofocus)) {
 376          //focus username or password
 377          $PAGE->requires->js_init_call('M.util.focus_login_form', null, true);
 378      }
 379  }
 380  
 381  echo $OUTPUT->footer();