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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      function auth_plugin_nntp() {
  39          $this->authtype = 'nntp';
  40          $this->config = get_config('auth/nntp');
  41      }
  42  
  43      /**
  44       * Returns true if the username and password work and false if they are
  45       * wrong or don't exist.
  46       *
  47       * @param string $username The username
  48       * @param string $password The password
  49       * @return bool Authentication success or failure.
  50       */
  51      function user_login ($username, $password) {
  52          if (! function_exists('imap_open')) {
  53              print_error('auth_nntpnotinstalled','auth_nntp');
  54              exit;
  55          }
  56  
  57          global $CFG;
  58  
  59          // try each multiple host
  60          $hosts = explode(';', $this->config->host);
  61          foreach ($hosts as $host) {
  62              $host = '{' . trim($host) . ':' . $this->config->port . '/nntp}';
  63  
  64              error_reporting(0);
  65              $connection = imap_open($host, $username, $password, OP_HALFOPEN);
  66              error_reporting($CFG->debug);
  67  
  68              if ($connection) {
  69                  imap_close($connection);
  70                  return true;
  71              }
  72          }
  73          return false;
  74      }
  75  
  76      function prevent_local_passwords() {
  77          return true;
  78      }
  79  
  80      /**
  81       * Returns true if this authentication plugin is 'internal'.
  82       *
  83       * @return bool
  84       */
  85      function is_internal() {
  86          return false;
  87      }
  88  
  89      /**
  90       * Returns true if this authentication plugin can change the user's
  91       * password.
  92       *
  93       * @return bool
  94       */
  95      function can_change_password() {
  96          return false;
  97      }
  98  
  99      /**
 100       * Prints a form for configuring this authentication plugin.
 101       *
 102       * This function is called from admin/auth.php, and outputs a full page with
 103       * a form for configuring this plugin.
 104       *
 105       * @param array $page An object containing all the data for this page.
 106       */
 107      function config_form($config, $err, $user_fields) {
 108          include  "config.html";
 109      }
 110  
 111      /**
 112       * Processes and stores configuration data for this authentication plugin.
 113       */
 114      function process_config($config) {
 115          // set to defaults if undefined
 116          if (!isset ($config->host)) {
 117              $config->host = '127.0.0.1';
 118          }
 119          if (!isset ($config->port)) {
 120              $config->port = '119';
 121          }
 122          if (!isset($config->changepasswordurl)) {
 123              $config->changepasswordurl = '';
 124          }
 125  
 126          // save settings
 127          set_config('host', $config->host, 'auth/nntp');
 128          set_config('port', $config->port, 'auth/nntp');
 129          set_config('changepasswordurl', $config->changepasswordurl, 'auth/nntp');
 130  
 131          return true;
 132      }
 133  
 134  }
 135  
 136