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