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peer.php
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peer.php
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<?php
/**
* An object to represent lots of information about an RPC-peer machine
*
* @author Donal McMullan donal@catalyst.net.nz
* @version 0.0.1
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package mnet
*/
require_once($CFG->libdir . '/filelib.php'); // download_file_content() used here
class mnet_peer {
/** No SSL verification. */
const SSL_NONE = 0;
/** SSL verification for host. */
const SSL_HOST = 1;
/** SSL verification for host and peer. */
const SSL_HOST_AND_PEER = 2;
var $id = 0;
var $wwwroot = '';
var $ip_address = '';
var $name = '';
var $public_key = '';
var $public_key_expires = 0;
var $last_connect_time = 0;
var $last_log_id = 0;
var $force_theme = 0;
var $theme = '';
var $applicationid = 1; // Default of 1 == Moodle
var $keypair = array();
var $error = array();
var $bootstrapped = false; // set when the object is populated
/** @var int $sslverification The level of SSL verification to apply. */
public $sslverification = self::SSL_HOST_AND_PEER;
/*
* Fetch information about a peer identified by wwwroot
* If information does not preexist in db, collect it together based on
* supplied information
*
* @param string $wwwroot - address of peer whose details we want
* @param string $pubkey - to use if we add a record to db for new peer
* @param int $application - table id - what kind of peer are we talking to
* @return bool - indication of success or failure
*/
function bootstrap($wwwroot, $pubkey, $application) {
global $DB;
if (substr($wwwroot, -1, 1) == '/') {
$wwwroot = substr($wwwroot, 0, -1);
}
// If a peer record already exists for this address,
// load that info and return
if ($this->set_wwwroot($wwwroot)) {
return true;
}
$hostname = mnet_get_hostname_from_uri($wwwroot);
// Get the IP address for that host - if this fails, it will return the hostname string
$ip_address = gethostbyname($hostname);
// Couldn't find the IP address?
if ($ip_address === $hostname && !preg_match('/^\d+\.\d+\.\d+.\d+$/',$hostname)) {
throw new moodle_exception('noaddressforhost', 'mnet', '', $hostname);
}
$this->name = $wwwroot;
// TODO: In reality, this will be prohibitively slow... need another
// default - maybe blank string
$homepage = download_file_content($wwwroot);
if (!empty($homepage)) {
$count = preg_match("@<title>(.*)</title>@siU", $homepage, $matches);
if ($count > 0) {
$this->name = $matches[1];
}
}
$this->wwwroot = $wwwroot;
$this->ip_address = $ip_address;
$this->deleted = 0;
$this->application = $DB->get_record('mnet_application', array('name'=>$application));
if (empty($this->application)) {
$this->application = $DB->get_record('mnet_application', array('name'=>'moodle'));
}
$this->applicationid = $this->application->id;
if(empty($pubkey)) {
$this->public_key = clean_param(mnet_get_public_key($this->wwwroot, $this->application), PARAM_PEM);
} else {
$this->public_key = clean_param($pubkey, PARAM_PEM);
}
$this->public_key_expires = $this->check_common_name($this->public_key);
$this->last_connect_time = 0;
$this->last_log_id = 0;
if ($this->public_key_expires == false) {
$this->public_key == '';
return false;
}
$this->bootstrapped = true;
}
/*
* Delete mnet peer
* the peer is marked as deleted in the database
* we delete current sessions.
* @return bool - success
*/
function delete() {
global $DB;
if ($this->deleted) {
return true;
}
$this->delete_all_sessions();
$this->deleted = 1;
return $this->commit();
}
function count_live_sessions() {
global $DB;
$obj = $this->delete_expired_sessions();
return $DB->count_records('mnet_session', array('mnethostid'=>$this->id));
}
function delete_expired_sessions() {
global $DB;
$now = time();
return $DB->delete_records_select('mnet_session', " mnethostid = ? AND expires < ? ", array($this->id, $now));
}
function delete_all_sessions() {
global $CFG, $DB;
// TODO: Expires each PHP session individually
$sessions = $DB->get_records('mnet_session', array('mnethostid'=>$this->id));
if (count($sessions) > 0 && file_exists($CFG->dirroot.'/auth/mnet/auth.php')) {
require_once($CFG->dirroot.'/auth/mnet/auth.php');
$auth = new auth_plugin_mnet();
$auth->end_local_sessions($sessions);
}
$deletereturn = $DB->delete_records('mnet_session', array('mnethostid'=>$this->id));
return true;
}
function check_common_name($key) {
$credentials = $this->check_credentials($key);
return $credentials['validTo_time_t'];
}
function check_credentials($key) {
$credentials = openssl_x509_parse($key);
if ($credentials == false) {
$this->error[] = array('code' => 3, 'text' => get_string("nonmatchingcert", 'mnet', array('subject' => '','host' => '')));
return false;
} elseif (array_key_exists('subjectAltName', $credentials['subject']) && $credentials['subject']['subjectAltName'] != $this->wwwroot) {
$a['subject'] = $credentials['subject']['subjectAltName'];
$a['host'] = $this->wwwroot;
$this->error[] = array('code' => 5, 'text' => get_string("nonmatchingcert", 'mnet', $a));
return false;
} else if ($credentials['subject']['CN'] !== substr($this->wwwroot, 0, 64)) {
$a['subject'] = $credentials['subject']['CN'];
$a['host'] = $this->wwwroot;
$this->error[] = array('code' => 4, 'text' => get_string("nonmatchingcert", 'mnet', $a));
return false;
} else {
if (array_key_exists('subjectAltName', $credentials['subject'])) {
$credentials['wwwroot'] = $credentials['subject']['subjectAltName'];
} else {
$credentials['wwwroot'] = $credentials['subject']['CN'];
}
return $credentials;
}
}
function commit() {
global $DB;
$obj = new stdClass();
$obj->wwwroot = $this->wwwroot;
$obj->ip_address = $this->ip_address;
$obj->name = $this->name;
$obj->public_key = $this->public_key;
$obj->public_key_expires = $this->public_key_expires;
$obj->deleted = $this->deleted;
$obj->last_connect_time = $this->last_connect_time;
$obj->last_log_id = $this->last_log_id;
$obj->force_theme = $this->force_theme;
$obj->theme = $this->theme;
$obj->applicationid = $this->applicationid;
$obj->sslverification = $this->sslverification;
if (isset($this->id) && $this->id > 0) {
$obj->id = $this->id;
return $DB->update_record('mnet_host', $obj);
} else {
$this->id = $DB->insert_record('mnet_host', $obj);
return $this->id > 0;
}
}
function touch() {
$this->last_connect_time = time();
$this->commit();
}
function set_name($newname) {
if (is_string($newname) && strlen($newname <= 80)) {
$this->name = $newname;
return true;
}
return false;
}
function set_applicationid($applicationid) {
if (is_numeric($applicationid) && $applicationid == intval($applicationid)) {
$this->applicationid = $applicationid;
return true;
}
return false;
}
/**
* Load information from db about an mnet peer into this object's properties
*
* @param string $wwwroot - address of peer whose details we want to load
* @return bool - indication of success or failure
*/
function set_wwwroot($wwwroot) {
global $CFG, $DB;
$hostinfo = $DB->get_record('mnet_host', array('wwwroot'=>$wwwroot));
if ($hostinfo != false) {
$this->populate($hostinfo);
return true;
}
return false;
}
function set_id($id) {
global $CFG, $DB;
if (clean_param($id, PARAM_INT) != $id) {
$this->errno[] = 1;
$this->errmsg[] = 'Your id ('.$id.') is not legal';
return false;
}
$sql = "
SELECT
h.*
FROM
{mnet_host} h
WHERE
h.id = ?";
if ($hostinfo = $DB->get_record_sql($sql, array($id))) {
$this->populate($hostinfo);
return true;
}
return false;
}
/**
* Several methods can be used to get an 'mnet_host' record. They all then
* send it to this private method to populate this object's attributes.
*
* @param object $hostinfo A database record from the mnet_host table
* @return void
*/
function populate($hostinfo) {
global $DB;
$this->id = $hostinfo->id;
$this->wwwroot = $hostinfo->wwwroot;
$this->ip_address = $hostinfo->ip_address;
$this->name = $hostinfo->name;
$this->deleted = $hostinfo->deleted;
$this->public_key = $hostinfo->public_key;
$this->public_key_expires = $hostinfo->public_key_expires;
$this->last_connect_time = $hostinfo->last_connect_time;
$this->last_log_id = $hostinfo->last_log_id;
$this->force_theme = $hostinfo->force_theme;
$this->theme = $hostinfo->theme;
$this->applicationid = $hostinfo->applicationid;
$this->sslverification = $hostinfo->sslverification;
$this->application = $DB->get_record('mnet_application', array('id'=>$this->applicationid));
$this->bootstrapped = true;
}
function get_public_key() {
if (isset($this->public_key_ref)) return $this->public_key_ref;
$this->public_key_ref = openssl_pkey_get_public($this->public_key);
return $this->public_key_ref;
}
}