[Summary view]

   1  <?php
   2  /**
   3   * An object to represent lots of information about an RPC-peer machine
   4   *
   5   * @author  Donal McMullan  donal@catalyst.net.nz
   6   * @version 0.0.1
   7   * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
   8   * @package mnet
   9   */
  10  
  11  class mnet_remote_client extends mnet_peer {
  12  
  13      // If the remote client is trying to execute a method on an object instead
  14      // of just a function, we'll instantiate the proper class and store it in
  15      // this 'object_to_call' property, or 'static_location' if it wants to be called statically
  16      var $object_to_call         = false;
  17      var $static_location        = false;
  18      var $request_was_encrypted  = false;
  19      var $request_was_signed     = false;
  20      var $signatureok = false; // True if we have successfully verified that the request was signed by an established peer
  21      var $pushkey = false; // True if we need to tell the remote peer about our current public key
  22      var $useprivatekey = ''; // The private key we should use to sign pushkey response
  23  
  24      function was_encrypted() {
  25          $this->request_was_encrypted  = true;
  26      }
  27  
  28      /* Record private key to use in pushkey response
  29       * Called when we have decrypted a request using an old (but still acceptable) keypair
  30       * @param $keyresource the private key we should use to sign the response.
  31       */
  32      function encrypted_to($keyresource) {
  33          $this->useprivatekey = $keyresource;
  34      }
  35  
  36      function set_pushkey() {
  37          $this->pushkey = true;
  38      }
  39  
  40      function was_signed() {
  41          $this->request_was_signed  = true;
  42      }
  43  
  44      function signature_verified() {
  45          $this->signatureok = true;
  46      }
  47  
  48      function object_to_call($object) {
  49          $this->object_to_call = $object;
  50      }
  51  
  52      function static_location($location) {
  53          $this->static_location = $location;
  54      }
  55  
  56      function plaintext_is_ok() {
  57          global $CFG;
  58  
  59          $trusted_hosts = explode(',', get_config('mnet', 'mnet_trusted_hosts'));
  60  
  61          foreach($trusted_hosts as $host) {
  62              if (address_in_subnet(getremoteaddr(), $host)) {
  63                  return true;
  64              }
  65          }
  66  
  67          return false;
  68      }
  69  
  70      function refresh_key() {
  71          mnet_debug("remote client refreshing key");
  72          global $CFG;
  73          // set up an RPC request
  74          require_once $CFG->dirroot.'/mnet/xmlrpc/client.php';
  75          $mnetrequest = new mnet_xmlrpc_client();
  76          // Use any method - listServices is pretty lightweight.
  77          $mnetrequest->set_method('system/listServices');
  78  
  79          // Do RPC call and store response
  80          if ($mnetrequest->send($this) === true) {
  81              mnet_debug("refresh key request complete");
  82              // Ok - we actually don't care about the result
  83              $temp = new mnet_peer();
  84              $temp->set_id($this->id);
  85              if($this->public_key != $temp->public_key) {
  86                  $newkey = clean_param($temp->public_key, PARAM_PEM);
  87                  if(!empty($newkey)) {
  88                      $this->public_key = $newkey;
  89                      return true;
  90                  }
  91              }
  92          }
  93          return false;
  94      }
  95  }