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   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   * Authentication Plugin: NNTP Authentication
  19   * Authenticates against an NNTP server.
  20   *
  21   * @package auth_nntp
  22   * @author Martin Dougiamas
  23   * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  require_once($CFG->libdir.'/authlib.php');
  29  
  30  /**
  31   * NNTP authentication plugin.
  32   */
  33  class auth_plugin_nntp extends auth_plugin_base {
  34  
  35      /**
  36       * Constructor.
  37       */
  38      public function __construct() {
  39          $this->authtype = 'nntp';
  40          $this->config = get_config('auth/nntp');
  41      }
  42  
  43      /**
  44       * Old syntax of class constructor. Deprecated in PHP7.
  45       *
  46       * @deprecated since Moodle 3.1
  47       */
  48      public function auth_plugin_nntp() {
  49          debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
  50          self::__construct();
  51      }
  52  
  53      /**
  54       * Returns true if the username and password work and false if they are
  55       * wrong or don't exist.
  56       *
  57       * @param string $username The username
  58       * @param string $password The password
  59       * @return bool Authentication success or failure.
  60       */
  61      function user_login ($username, $password) {
  62          if (! function_exists('imap_open')) {
  63              print_error('auth_nntpnotinstalled','auth_nntp');
  64              exit;
  65          }
  66  
  67          global $CFG;
  68  
  69          // try each multiple host
  70          $hosts = explode(';', $this->config->host);
  71          foreach ($hosts as $host) {
  72              $host = '{' . trim($host) . ':' . $this->config->port . '/nntp}';
  73  
  74              error_reporting(0);
  75              $connection = imap_open($host, $username, $password, OP_HALFOPEN);
  76              error_reporting($CFG->debug);
  77  
  78              if ($connection) {
  79                  imap_close($connection);
  80                  return true;
  81              }
  82          }
  83          return false;
  84      }
  85  
  86      function prevent_local_passwords() {
  87          return true;
  88      }
  89  
  90      /**
  91       * Returns true if this authentication plugin is 'internal'.
  92       *
  93       * @return bool
  94       */
  95      function is_internal() {
  96          return false;
  97      }
  98  
  99      /**
 100       * Returns true if this authentication plugin can change the user's
 101       * password.
 102       *
 103       * @return bool
 104       */
 105      function can_change_password() {
 106          return false;
 107      }
 108  
 109      /**
 110       * Prints a form for configuring this authentication plugin.
 111       *
 112       * This function is called from admin/auth.php, and outputs a full page with
 113       * a form for configuring this plugin.
 114       *
 115       * @param array $page An object containing all the data for this page.
 116       */
 117      function config_form($config, $err, $user_fields) {
 118          include  "config.html";
 119      }
 120  
 121      /**
 122       * Processes and stores configuration data for this authentication plugin.
 123       */
 124      function process_config($config) {
 125          // set to defaults if undefined
 126          if (!isset ($config->host)) {
 127              $config->host = '127.0.0.1';
 128          }
 129          if (!isset ($config->port)) {
 130              $config->port = '119';
 131          }
 132          if (!isset($config->changepasswordurl)) {
 133              $config->changepasswordurl = '';
 134          }
 135  
 136          // save settings
 137          set_config('host', $config->host, 'auth/nntp');
 138          set_config('port', $config->port, 'auth/nntp');
 139          set_config('changepasswordurl', $config->changepasswordurl, 'auth/nntp');
 140  
 141          return true;
 142      }
 143  
 144  }
 145  
 146