login/lib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  *
  19  * Login library file of login/password related Moodle functions.
  20  *
  21  * @package    core
  22  * @subpackage lib
  23  * @copyright  Catalyst IT
  24  * @copyright  Peter Bulmer
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27 define('PWRESET_STATUS_NOEMAILSENT', 1);
  28 define('PWRESET_STATUS_TOKENSENT', 2);
  29 define('PWRESET_STATUS_OTHEREMAILSENT', 3);
  30 define('PWRESET_STATUS_ALREADYSENT', 4);
  31
  32 /**
  33  *  Processes a user's request to set a new password in the event they forgot the old one.
  34  *  If no user identifier has been supplied, it displays a form where they can submit their identifier.
  35  *  Where they have supplied identifier, the function will check their status, and send email as appropriate.
  36  */
  37 function core_login_process_password_reset_request() {
  38     global $DB, $OUTPUT, $CFG, $PAGE;
  39     $systemcontext = context_system::instance();
  40     $mform = new login_forgot_password_form();
  41
  42     if ($mform->is_cancelled()) {
  43         redirect(get_login_url());
  44
  45     } else if ($data = $mform->get_data()) {
  46         // Requesting user has submitted form data.
  47         // Next find the user account in the database which the requesting user claims to own.
  48         if (!empty($data->username)) {
  49             // Username has been specified - load the user record based on that.
  50             $username = core_text::strtolower($data->username); // Mimic the login page process.
  51             $userparams = array('username' => $username, 'mnethostid' => $CFG->mnet_localhost_id, 'deleted' => 0, 'suspended' => 0);
  52             $user = $DB->get_record('user', $userparams);
  53         } else {
  54             // Try to load the user record based on email address.
  55             // this is tricky because
  56             // 1/ the email is not guaranteed to be unique - TODO: send email with all usernames to select the account for pw reset
  57             // 2/ mailbox may be case sensitive, the email domain is case insensitive - let's pretend it is all case-insensitive.
  58
  59             $select = $DB->sql_like('email', ':email', false, true, false, '|') .
  60                     " AND mnethostid = :mnethostid AND deleted=0 AND suspended=0";
  61             $params = array('email' => $DB->sql_like_escape($data->email, '|'), 'mnethostid' => $CFG->mnet_localhost_id);
  62             $user = $DB->get_record_select('user', $select, $params, '*', IGNORE_MULTIPLE);
  63         }
  64
  65         // Target user details have now been identified, or we know that there is no such account.
  66         // Send email address to account's email address if appropriate.
  67         $pwresetstatus = PWRESET_STATUS_NOEMAILSENT;
  68         if ($user and !empty($user->confirmed)) {
  69             $userauth = get_auth_plugin($user->auth);
  70             if (!$userauth->can_reset_password() or !is_enabled_auth($user->auth)
  71               or !has_capability('moodle/user:changeownpassword', $systemcontext, $user->id)) {
  72                 if (send_password_change_info($user)) {
  73                     $pwresetstatus = PWRESET_STATUS_OTHEREMAILSENT;
  74                 } else {
  75                     print_error('cannotmailconfirm');
  76                 }
  77             } else {
  78                 // The account the requesting user claims to be is entitled to change their password.
  79                 // Next, check if they have an existing password reset in progress.
  80                 $resetinprogress = $DB->get_record('user_password_resets', array('userid' => $user->id));
  81                 if (empty($resetinprogress)) {
  82                     // Completely new reset request - common case.
  83                     $resetrecord = core_login_generate_password_reset($user);
  84                     $sendemail = true;
  85                 } else if ($resetinprogress->timerequested < (time() - $CFG->pwresettime)) {
  86                     // Preexisting, but expired request - delete old record & create new one.
  87                     // Uncommon case - expired requests are cleaned up by cron.
  88                     $DB->delete_records('user_password_resets', array('id' => $resetinprogress->id));
  89                     $resetrecord = core_login_generate_password_reset($user);
  90                     $sendemail = true;
  91                 } else if (empty($resetinprogress->timererequested)) {
  92                     // Preexisting, valid request. This is the first time user has re-requested the reset.
  93                     // Re-sending the same email once can actually help in certain circumstances
  94                     // eg by reducing the delay caused by greylisting.
  95                     $resetinprogress->timererequested = time();
  96                     $DB->update_record('user_password_resets', $resetinprogress);
  97                     $resetrecord = $resetinprogress;
  98                     $sendemail = true;
  99                 } else {
 100                     // Preexisting, valid request. User has already re-requested email.
 101                     $pwresetstatus = PWRESET_STATUS_ALREADYSENT;
 102                     $sendemail = false;
 103                 }
 104
 105                 if ($sendemail) {
 106                     $sendresult = send_password_change_confirmation_email($user, $resetrecord);
 107                     if ($sendresult) {
 108                         $pwresetstatus = PWRESET_STATUS_TOKENSENT;
 109                     } else {
 110                         print_error('cannotmailconfirm');
 111                     }
 112                 }
 113             }
 114         }
 115
 116         // Any email has now been sent.
 117         // Next display results to requesting user if settings permit.
 118         echo $OUTPUT->header();
 119
 120         if (!empty($CFG->protectusernames)) {
 121             // Neither confirm, nor deny existance of any username or email address in database.
 122             // Print general (non-commital) message.
 123             notice(get_string('emailpasswordconfirmmaybesent'), $CFG->wwwroot.'/index.php');
 124             die; // Never reached.
 125         } else if (empty($user)) {
 126             // Protect usernames is off, and we couldn't find the user with details specified.
 127             // Print failure advice.
 128             notice(get_string('emailpasswordconfirmnotsent'), $CFG->wwwroot.'/forgot_password.php');
 129             die; // Never reached.
 130         } else if (empty($user->email)) {
 131             // User doesn't have an email set - can't send a password change confimation email.
 132             notice(get_string('emailpasswordconfirmnoemail'), $CFG->wwwroot.'/index.php');
 133             die; // Never reached.
 134         } else if ($pwresetstatus == PWRESET_STATUS_ALREADYSENT) {
 135             // User found, protectusernames is off, but user has already (re) requested a reset.
 136             // Don't send a 3rd reset email.
 137             $stremailalreadysent = get_string('emailalreadysent');
 138             notice($stremailalreadysent, $CFG->wwwroot.'/index.php');
 139             die; // Never reached.
 140         } else if ($pwresetstatus == PWRESET_STATUS_NOEMAILSENT) {
 141             // User found, protectusernames is off, but user is not confirmed.
 142             // Pretend we sent them an email.
 143             // This is a big usability problem - need to tell users why we didn't send them an email.
 144             // Obfuscate email address to protect privacy.
 145             $protectedemail = preg_replace('/([^@]*)@(.*)/', '******@$2', $user->email);
 146             $stremailpasswordconfirmsent = get_string('emailpasswordconfirmsent', '', $protectedemail);
 147             notice($stremailpasswordconfirmsent, $CFG->wwwroot.'/index.php');
 148             die; // Never reached.
 149         } else {
 150             // Confirm email sent. (Obfuscate email address to protect privacy).
 151             $protectedemail = preg_replace('/([^@]*)@(.*)/', '******@$2', $user->email);
 152             // This is a small usability problem - may be obfuscating the email address which the user has just supplied.
 153             $stremailresetconfirmsent = get_string('emailresetconfirmsent', '', $protectedemail);
 154             notice($stremailresetconfirmsent, $CFG->wwwroot.'/index.php');
 155             die; // Never reached.
 156         }
 157         die; // Never reached.
 158     }
 159
 160     // Make sure we really are on the https page when https login required.
 161     $PAGE->verify_https_required();
 162
 163     // DISPLAY FORM.
 164
 165     echo $OUTPUT->header();
 166     echo $OUTPUT->box(get_string('passwordforgotteninstructions2'), 'generalbox boxwidthnormal boxaligncenter');
 167     $mform->display();
 168
 169     echo $OUTPUT->footer();
 170 }
 171
 172 /**
 173  * This function processes a user's submitted token to validate the request to set a new password.
 174  * If the user's token is validated, they are prompted to set a new password.
 175  * @param string $token the one-use identifier which should verify the password reset request as being valid.
 176  * @return void
 177  */
 178 function core_login_process_password_set($token) {
 179     global $DB, $CFG, $OUTPUT, $PAGE, $SESSION;
 180     $pwresettime = isset($CFG->pwresettime) ? $CFG->pwresettime : 1800;
 181     $sql = "SELECT u.*, upr.token, upr.timerequested, upr.id as tokenid
 182               FROM {user} u
 183               JOIN {user_password_resets} upr ON upr.userid = u.id
 184              WHERE upr.token = ?";
 185     $user = $DB->get_record_sql($sql, array($token));
 186
 187     $forgotpasswordurl = "{$CFG->httpswwwroot}/login/forgot_password.php";
 188     if (empty($user) or ($user->timerequested < (time() - $pwresettime - DAYSECS))) {
 189         // There is no valid reset request record - not even a recently expired one.
 190         // (suspicious)
 191         // Direct the user to the forgot password page to request a password reset.
 192         echo $OUTPUT->header();
 193         notice(get_string('noresetrecord'), $forgotpasswordurl);
 194         die; // Never reached.
 195     }
 196     if ($user->timerequested < (time() - $pwresettime)) {
 197         // There is a reset record, but it's expired.
 198         // Direct the user to the forgot password page to request a password reset.
 199         $pwresetmins = floor($pwresettime / MINSECS);
 200         echo $OUTPUT->header();
 201         notice(get_string('resetrecordexpired', '', $pwresetmins), $forgotpasswordurl);
 202         die; // Never reached.
 203     }
 204
 205     if ($user->auth === 'nologin' or !is_enabled_auth($user->auth)) {
 206         // Bad luck - user is not able to login, do not let them set password.
 207         echo $OUTPUT->header();
 208         print_error('forgotteninvalidurl');
 209         die; // Never reached.
 210     }
 211
 212     // Check this isn't guest user.
 213     if (isguestuser($user)) {
 214         print_error('cannotresetguestpwd');
 215     }
 216
 217     // Token is correct, and unexpired.
 218     $mform = new login_set_password_form(null, null, 'post', '', 'autocomplete="yes"');
 219     $data = $mform->get_data();
 220     if (empty($data)) {
 221         // User hasn't submitted form, they got here directly from email link.
 222         // Next, display the form.
 223         $setdata = new stdClass();
 224         $setdata->username = $user->username;
 225         $setdata->username2 = $user->username;
 226         $setdata->token = $user->token;
 227         $mform->set_data($setdata);
 228         $PAGE->verify_https_required();
 229         echo $OUTPUT->header();
 230         echo $OUTPUT->box(get_string('setpasswordinstructions'), 'generalbox boxwidthnormal boxaligncenter');
 231         $mform->display();
 232         echo $OUTPUT->footer();
 233         return;
 234     } else {
 235         // User has submitted form.
 236         // Delete this token so it can't be used again.
 237         $DB->delete_records('user_password_resets', array('id' => $user->tokenid));
 238         $userauth = get_auth_plugin($user->auth);
 239         if (!$userauth->user_update_password($user, $data->password)) {
 240             print_error('errorpasswordupdate', 'auth');
 241         }
 242         // Reset login lockout (if present) before a new password is set.
 243         login_unlock_account($user);
 244         // Clear any requirement to change passwords.
 245         unset_user_preference('auth_forcepasswordchange', $user);
 246         unset_user_preference('create_password', $user);
 247
 248         if (!empty($user->lang)) {
 249             // Unset previous session language - use user preference instead.
 250             unset($SESSION->lang);
 251         }
 252         complete_user_login($user); // Triggers the login event.
 253
 254         $urltogo = core_login_get_return_url();
 255         unset($SESSION->wantsurl);
 256         redirect($urltogo, get_string('passwordset'), 1);
 257     }
 258 }
 259
 260 /** Create a new record in the database to track a new password set request for user.
 261  * @param object $user the user record, the requester would like a new password set for.
 262  * @return record created.
 263  */
 264 function core_login_generate_password_reset ($user) {
 265     global $DB;
 266     $resetrecord = new stdClass();
 267     $resetrecord->timerequested = time();
 268     $resetrecord->userid = $user->id;
 269     $resetrecord->token = random_string(32);
 270     $resetrecord->id = $DB->insert_record('user_password_resets', $resetrecord);
 271     return $resetrecord;
 272 }
 273
 274 /**  Determine where a user should be redirected after they have been logged in.
 275  * @return string url the user should be redirected to.
 276  */
 277 function core_login_get_return_url() {
 278     global $CFG, $SESSION, $USER;
 279     // Prepare redirection.
 280     if (user_not_fully_set_up($USER)) {
 281         $urltogo = $CFG->wwwroot.'/user/edit.php';
 282         // We don't delete $SESSION->wantsurl yet, so we get there later.
 283
 284     } else if (isset($SESSION->wantsurl) and (strpos($SESSION->wantsurl, $CFG->wwwroot) === 0
 285             or strpos($SESSION->wantsurl, str_replace('http://', 'https://', $CFG->wwwroot)) === 0)) {
 286         $urltogo = $SESSION->wantsurl;    // Because it's an address in this site.
 287         unset($SESSION->wantsurl);
 288     } else {
 289         // No wantsurl stored or external - go to homepage.
 290         $urltogo = $CFG->wwwroot.'/';
 291         unset($SESSION->wantsurl);
 292     }
 293
 294     // If the url to go to is the same as the site page, check for default homepage.
 295     if ($urltogo == ($CFG->wwwroot . '/')) {
 296         $homepage = get_home_page();
 297         // Go to my-moodle page instead of site homepage if defaulthomepage set to homepage_my.
 298         if ($homepage == HOMEPAGE_MY && !is_siteadmin() && !isguestuser()) {
 299             if ($urltogo == $CFG->wwwroot or $urltogo == $CFG->wwwroot.'/' or $urltogo == $CFG->wwwroot.'/index.php') {
 300                 $urltogo = $CFG->wwwroot.'/my/';
 301             }
 302         }
 303     }
 304     return $urltogo;
 305 }