mnet/peer.php

   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 require_once($CFG->libdir . '/filelib.php'); // download_file_content() used here
  12
  13 class mnet_peer {
  14
  15     /** No SSL verification. */
  16     const SSL_NONE = 0;
  17
  18     /** SSL verification for host. */
  19     const SSL_HOST = 1;
  20
  21     /** SSL verification for host and peer. */
  22     const SSL_HOST_AND_PEER = 2;
  23
  24     var $id                 = 0;
  25     var $wwwroot            = '';
  26     var $ip_address         = '';
  27     var $name               = '';
  28     var $public_key         = '';
  29     var $public_key_expires = 0;
  30     var $last_connect_time  = 0;
  31     var $last_log_id        = 0;
  32     var $force_theme        = 0;
  33     var $theme              = '';
  34     var $applicationid      = 1; // Default of 1 == Moodle
  35     var $keypair            = array();
  36     var $error              = array();
  37     var $bootstrapped       = false; // set when the object is populated
  38
  39     /** @var int $sslverification The level of SSL verification to apply. */
  40     public $sslverification = self::SSL_HOST_AND_PEER;
  41
  42     /*
  43      * Fetch information about a peer identified by wwwroot
  44      * If information does not preexist in db, collect it together based on
  45      * supplied information
  46      *
  47      * @param string $wwwroot - address of peer whose details we want
  48      * @param string $pubkey - to use if we add a record to db for new peer
  49      * @param int $application - table id - what kind of peer are we talking to
  50      * @return bool - indication of success or failure
  51      */
  52     function bootstrap($wwwroot, $pubkey = null, $application) {
  53         global $DB;
  54
  55         if (substr($wwwroot, -1, 1) == '/') {
  56             $wwwroot = substr($wwwroot, 0, -1);
  57         }
  58
  59         // If a peer record already exists for this address,
  60         // load that info and return
  61         if ($this->set_wwwroot($wwwroot)) {
  62             return true;
  63         }
  64
  65         $hostname = mnet_get_hostname_from_uri($wwwroot);
  66         // Get the IP address for that host - if this fails, it will return the hostname string
  67         $ip_address = gethostbyname($hostname);
  68
  69         // Couldn't find the IP address?
  70         if ($ip_address === $hostname && !preg_match('/^\d+\.\d+\.\d+.\d+$/',$hostname)) {
  71             throw new moodle_exception('noaddressforhost', 'mnet', '', $hostname);
  72         }
  73
  74         $this->name = $wwwroot;
  75
  76         // TODO: In reality, this will be prohibitively slow... need another
  77         // default - maybe blank string
  78         $homepage = download_file_content($wwwroot);
  79         if (!empty($homepage)) {
  80             $count = preg_match("@<title>(.*)</title>@siU", $homepage, $matches);
  81             if ($count > 0) {
  82                 $this->name = $matches[1];
  83             }
  84         }
  85
  86         $this->wwwroot              = $wwwroot;
  87         $this->ip_address           = $ip_address;
  88         $this->deleted              = 0;
  89
  90         $this->application = $DB->get_record('mnet_application', array('name'=>$application));
  91         if (empty($this->application)) {
  92             $this->application = $DB->get_record('mnet_application', array('name'=>'moodle'));
  93         }
  94
  95         $this->applicationid = $this->application->id;
  96
  97         if(empty($pubkey)) {
  98             $this->public_key           = clean_param(mnet_get_public_key($this->wwwroot, $this->application), PARAM_PEM);
  99         } else {
 100             $this->public_key           = clean_param($pubkey, PARAM_PEM);
 101         }
 102         $this->public_key_expires   = $this->check_common_name($this->public_key);
 103         $this->last_connect_time    = 0;
 104         $this->last_log_id          = 0;
 105         if ($this->public_key_expires == false) {
 106             $this->public_key == '';
 107             return false;
 108         }
 109         $this->bootstrapped = true;
 110     }
 111
 112     /*
 113      * Delete mnet peer
 114      * the peer is marked as deleted in the database
 115      * we delete current sessions.
 116      * @return bool - success
 117      */
 118     function delete() {
 119         global $DB;
 120
 121         if ($this->deleted) {
 122             return true;
 123         }
 124
 125         $this->delete_all_sessions();
 126
 127         $this->deleted = 1;
 128         return $this->commit();
 129     }
 130
 131     function count_live_sessions() {
 132         global $DB;
 133         $obj = $this->delete_expired_sessions();
 134         return $DB->count_records('mnet_session', array('mnethostid'=>$this->id));
 135     }
 136
 137     function delete_expired_sessions() {
 138         global $DB;
 139         $now = time();
 140         return $DB->delete_records_select('mnet_session', " mnethostid = ? AND expires < ? ", array($this->id, $now));
 141     }
 142
 143     function delete_all_sessions() {
 144         global $CFG, $DB;
 145         // TODO: Expires each PHP session individually
 146         $sessions = $DB->get_records('mnet_session', array('mnethostid'=>$this->id));
 147
 148         if (count($sessions) > 0 && file_exists($CFG->dirroot.'/auth/mnet/auth.php')) {
 149             require_once($CFG->dirroot.'/auth/mnet/auth.php');
 150             $auth = new auth_plugin_mnet();
 151             $auth->end_local_sessions($sessions);
 152         }
 153
 154         $deletereturn = $DB->delete_records('mnet_session', array('mnethostid'=>$this->id));
 155         return true;
 156     }
 157
 158     function check_common_name($key) {
 159         $credentials = $this->check_credentials($key);
 160         return $credentials['validTo_time_t'];
 161     }
 162
 163     function check_credentials($key) {
 164         $credentials = openssl_x509_parse($key);
 165         if ($credentials == false) {
 166             $this->error[] = array('code' => 3, 'text' => get_string("nonmatchingcert", 'mnet', array('subject' => '','host' => '')));
 167             return false;
 168         } elseif (array_key_exists('subjectAltName', $credentials['subject']) && $credentials['subject']['subjectAltName'] != $this->wwwroot) {
 169             $a['subject'] = $credentials['subject']['subjectAltName'];
 170             $a['host'] = $this->wwwroot;
 171             $this->error[] = array('code' => 5, 'text' => get_string("nonmatchingcert", 'mnet', $a));
 172             return false;
 173         } else if ($credentials['subject']['CN'] !== substr($this->wwwroot, 0, 64)) {
 174             $a['subject'] = $credentials['subject']['CN'];
 175             $a['host'] = $this->wwwroot;
 176             $this->error[] = array('code' => 4, 'text' => get_string("nonmatchingcert", 'mnet', $a));
 177             return false;
 178         } else {
 179             if (array_key_exists('subjectAltName', $credentials['subject'])) {
 180                 $credentials['wwwroot'] = $credentials['subject']['subjectAltName'];
 181             } else {
 182                 $credentials['wwwroot'] = $credentials['subject']['CN'];
 183             }
 184             return $credentials;
 185         }
 186     }
 187
 188     function commit() {
 189         global $DB;
 190         $obj = new stdClass();
 191
 192         $obj->wwwroot               = $this->wwwroot;
 193         $obj->ip_address            = $this->ip_address;
 194         $obj->name                  = $this->name;
 195         $obj->public_key            = $this->public_key;
 196         $obj->public_key_expires    = $this->public_key_expires;
 197         $obj->deleted               = $this->deleted;
 198         $obj->last_connect_time     = $this->last_connect_time;
 199         $obj->last_log_id           = $this->last_log_id;
 200         $obj->force_theme           = $this->force_theme;
 201         $obj->theme                 = $this->theme;
 202         $obj->applicationid         = $this->applicationid;
 203         $obj->sslverification       = $this->sslverification;
 204
 205         if (isset($this->id) && $this->id > 0) {
 206             $obj->id = $this->id;
 207             return $DB->update_record('mnet_host', $obj);
 208         } else {
 209             $this->id = $DB->insert_record('mnet_host', $obj);
 210             return $this->id > 0;
 211         }
 212     }
 213
 214     function touch() {
 215         $this->last_connect_time = time();
 216         $this->commit();
 217     }
 218
 219     function set_name($newname) {
 220         if (is_string($newname) && strlen($newname <= 80)) {
 221             $this->name = $newname;
 222             return true;
 223         }
 224         return false;
 225     }
 226
 227     function set_applicationid($applicationid) {
 228         if (is_numeric($applicationid) && $applicationid == intval($applicationid)) {
 229             $this->applicationid = $applicationid;
 230             return true;
 231         }
 232         return false;
 233     }
 234
 235     /**
 236      * Load information from db about an mnet peer into this object's properties
 237      *
 238      * @param string $wwwroot - address of peer whose details we want to load
 239      * @return bool - indication of success or failure
 240      */
 241     function set_wwwroot($wwwroot) {
 242         global $CFG, $DB;
 243
 244         $hostinfo = $DB->get_record('mnet_host', array('wwwroot'=>$wwwroot));
 245
 246         if ($hostinfo != false) {
 247             $this->populate($hostinfo);
 248             return true;
 249         }
 250         return false;
 251     }
 252
 253     function set_id($id) {
 254         global $CFG, $DB;
 255
 256         if (clean_param($id, PARAM_INT) != $id) {
 257             $this->errno[]  = 1;
 258             $this->errmsg[] = 'Your id ('.$id.') is not legal';
 259             return false;
 260         }
 261
 262         $sql = "
 263                 SELECT
 264                     h.*
 265                 FROM
 266                     {mnet_host} h
 267                 WHERE
 268                     h.id = ?";
 269
 270         if ($hostinfo = $DB->get_record_sql($sql, array($id))) {
 271             $this->populate($hostinfo);
 272             return true;
 273         }
 274         return false;
 275     }
 276
 277     /**
 278      * Several methods can be used to get an 'mnet_host' record. They all then
 279      * send it to this private method to populate this object's attributes.
 280      *
 281      * @param   object  $hostinfo   A database record from the mnet_host table
 282      * @return  void
 283      */
 284     function populate($hostinfo) {
 285         global $DB;
 286         $this->id                   = $hostinfo->id;
 287         $this->wwwroot              = $hostinfo->wwwroot;
 288         $this->ip_address           = $hostinfo->ip_address;
 289         $this->name                 = $hostinfo->name;
 290         $this->deleted              = $hostinfo->deleted;
 291         $this->public_key           = $hostinfo->public_key;
 292         $this->public_key_expires   = $hostinfo->public_key_expires;
 293         $this->last_connect_time    = $hostinfo->last_connect_time;
 294         $this->last_log_id          = $hostinfo->last_log_id;
 295         $this->force_theme          = $hostinfo->force_theme;
 296         $this->theme                = $hostinfo->theme;
 297         $this->applicationid        = $hostinfo->applicationid;
 298         $this->sslverification      = $hostinfo->sslverification;
 299         $this->application = $DB->get_record('mnet_application', array('id'=>$this->applicationid));
 300         $this->bootstrapped = true;
 301     }
 302
 303     function get_public_key() {
 304         if (isset($this->public_key_ref)) return $this->public_key_ref;
 305         $this->public_key_ref = openssl_pkey_get_public($this->public_key);
 306         return $this->public_key_ref;
 307     }
 308 }