mnet/environment.php

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