[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * Info about the local environment, wrt RPC
   4   *
   5   * This should really be a singleton. A PHP5 Todo I guess.
   6   */
   7  
   8  class mnet_environment {
   9  
  10      var $id                 = 0;
  11      var $wwwroot            = '';
  12      var $ip_address         = '';
  13      var $public_key         = '';
  14      var $public_key_expires = 0;
  15      var $last_connect_time  = 0;
  16      var $last_log_id        = 0;
  17      var $keypair            = array();
  18      var $deleted            = 0;
  19  
  20      function mnet_environment() {
  21          return true;
  22      }
  23  
  24      function init() {
  25          global $CFG, $DB;
  26  
  27          // Bootstrap the object data on first load.
  28          if (!$hostobject = $DB->get_record('mnet_host', array('id'=>$CFG->mnet_localhost_id))) {
  29              return false;
  30          }
  31          $temparr = get_object_vars($hostobject);
  32          foreach($temparr as $key => $value) {
  33              $this->$key = $value;
  34          }
  35          unset($hostobject, $temparr);
  36  
  37          // Unless this is an install/upgrade, generate the SSL keys.
  38          if (empty($this->public_key)) {
  39              $this->get_keypair();
  40          }
  41  
  42          // We need to set up a record that represents 'all hosts'. Any rights
  43          // granted to this host will be conferred on all hosts.
  44          if (empty($CFG->mnet_all_hosts_id) ) {
  45              $hostobject                     = new stdClass();
  46              $hostobject->wwwroot            = '';
  47              $hostobject->ip_address         = '';
  48              $hostobject->public_key         = '';
  49              $hostobject->public_key_expires = 0;
  50              $hostobject->last_connect_time  = 0;
  51              $hostobject->last_log_id        = 0;
  52              $hostobject->deleted            = 0;
  53              $hostobject->name               = 'All Hosts';
  54  
  55              $hostobject->id = $DB->insert_record('mnet_host',$hostobject);
  56              set_config('mnet_all_hosts_id', $hostobject->id);
  57              $CFG->mnet_all_hosts_id = $hostobject->id;
  58              unset($hostobject);
  59          }
  60      }
  61  
  62      function get_keypair() {
  63          global $DB, $CFG;
  64  
  65          // We don't generate keys on install/upgrade because we want the USER
  66          // record to have an email address, city and country already.
  67          if (during_initial_install()) return true;
  68          if ($CFG->mnet_dispatcher_mode == 'off') return true;
  69          if (!extension_loaded("openssl")) return true;
  70          if (!empty($this->keypair)) return true;
  71  
  72          $this->keypair = array();
  73          $keypair = get_config('mnet', 'openssl');
  74  
  75          if (!empty($keypair)) {
  76              // Explode/Implode is faster than Unserialize/Serialize
  77              list($this->keypair['certificate'], $this->keypair['keypair_PEM']) = explode('@@@@@@@@', $keypair);
  78          }
  79  
  80          if ($this->public_key_expires > time()) {
  81              $this->keypair['privatekey'] = openssl_pkey_get_private($this->keypair['keypair_PEM']);
  82              $this->keypair['publickey']  = openssl_pkey_get_public($this->keypair['certificate']);
  83          } else {
  84              // Key generation/rotation
  85  
  86              // 1. Archive the current key (if there is one).
  87              $result = get_config('mnet', 'openssl_history');
  88              if(empty($result)) {
  89                  set_config('openssl_history', serialize(array()), 'mnet');
  90                  $openssl_history = array();
  91              } else {
  92                  $openssl_history = unserialize($result);
  93              }
  94  
  95              if(count($this->keypair)) {
  96                  $this->keypair['expires'] = $this->public_key_expires;
  97                  array_unshift($openssl_history, $this->keypair);
  98              }
  99  
 100              // 2. How many old keys do we want to keep? Use array_slice to get
 101              // rid of any we don't want
 102              $openssl_generations = get_config('mnet', 'openssl_generations');
 103              if(empty($openssl_generations)) {
 104                  set_config('openssl_generations', 3, 'mnet');
 105                  $openssl_generations = 3;
 106              }
 107  
 108              if(count($openssl_history) > $openssl_generations) {
 109                  $openssl_history = array_slice($openssl_history, 0, $openssl_generations);
 110              }
 111  
 112              set_config('openssl_history', serialize($openssl_history), 'mnet');
 113  
 114              // 3. Generate fresh keys
 115              $this->replace_keys();
 116          }
 117          return true;
 118      }
 119  
 120      function replace_keys() {
 121          global $DB, $CFG;
 122  
 123          $keypair = mnet_generate_keypair();
 124          if (empty($keypair)) {
 125              error_log('Can not generate keypair, sorry');
 126              return;
 127          }
 128  
 129          $this->keypair = array();
 130          $this->keypair            = $keypair;
 131          $this->public_key         = $this->keypair['certificate'];
 132          $details                  = openssl_x509_parse($this->public_key);
 133          $this->public_key_expires = $details['validTo_time_t'];
 134  
 135          $this->wwwroot            = $CFG->wwwroot;
 136          if (empty($_SERVER['SERVER_ADDR'])) {
 137              // SERVER_ADDR is only returned by Apache-like webservers
 138              $my_hostname = mnet_get_hostname_from_uri($CFG->wwwroot);
 139              $my_ip       = gethostbyname($my_hostname);  // Returns unmodified hostname on failure. DOH!
 140              if ($my_ip == $my_hostname) {
 141                  $this->ip_address = 'UNKNOWN';
 142              } else {
 143                  $this->ip_address = $my_ip;
 144              }
 145          } else {
 146              $this->ip_address = $_SERVER['SERVER_ADDR'];
 147          }
 148  
 149          set_config('openssl', implode('@@@@@@@@', $this->keypair), 'mnet');
 150  
 151          $DB->update_record('mnet_host', $this);
 152          error_log('New public key has been generated. It expires ' . date('Y/m/d h:i:s', $this->public_key_expires));
 153      }
 154  
 155      function get_private_key() {
 156          if (empty($this->keypair)) $this->get_keypair();
 157          if (isset($this->keypair['privatekey'])) return $this->keypair['privatekey'];
 158          $this->keypair['privatekey'] = openssl_pkey_get_private($this->keypair['keypair_PEM']);
 159          return $this->keypair['privatekey'];
 160      }
 161  
 162      function get_public_key() {
 163          if (!isset($this->keypair)) $this->get_keypair();
 164          if (isset($this->keypair['publickey'])) return $this->keypair['publickey'];
 165          $this->keypair['publickey'] = openssl_pkey_get_public($this->keypair['certificate']);
 166          return $this->keypair['publickey'];
 167      }
 168  }