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<?php

/**

*

* @package phpBB3

* @copyright (c) 2007 phpBB Group

* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2

*

*/

/**

* @ignore

*/

if (!defined('IN_PHPBB'))

{

        exit;

}

/**

*

* Jabber class from Flyspray project

*

* @version class.jabber2.php 1595 2008-09-19 (0.9.9)

* @copyright 2006 Flyspray.org

* @author Florian Schmitz (floele)

*

* Only slightly modified by Acyd Burn

*

* @package phpBB3

*/

class jabber

{

        var $connection = null;

        var $session = array();

        var $timeout = 10;

        var $server;

        var $connect_server;

        var $port;

        var $username;

        var $password;

        var $use_ssl;

        var $resource = 'functions_jabber.phpbb.php';

        var $enable_logging;

        var $log_array;

        var $features = array();

        /**

        */

        function jabber($server, $port, $username, $password, $use_ssl = false)

        {

                $this->connect_server                = ($server) ? $server : 'localhost';

                $this->port                                        = ($port) ? $port : 5222;

                // Get the server and the username

                if (strpos($username, '@') === false)

                {

                        $this->server = $this->connect_server;

                        $this->username = $username;

                }

                else

                {

                        $jid = explode('@', $username, 2);

                        $this->username = $jid[0];

                        $this->server = $jid[1];

                }

                $this->password                                = $password;

                $this->use_ssl                                = ($use_ssl && $this->can_use_ssl()) ? true : false;

                // Change port if we use SSL

                if ($this->port == 5222 && $this->use_ssl)

                {

                        $this->port = 5223;

                }

                $this->enable_logging                = true;

                $this->log_array                        = array();

        }

        /**

        * Able to use the SSL functionality?

        */

        function can_use_ssl()

        {

                // Will not work with PHP >= 5.2.1 or < 5.2.3RC2 until timeout problem with ssl hasn't been fixed (http://bugs.php.net/41236)

                return ((version_compare(PHP_VERSION, '5.2.1', '<') || version_compare(PHP_VERSION, '5.2.3RC2', '>=')) && @extension_loaded('openssl')) ? true : false;

        }

        /**

        * Able to use TLS?

        */

        function can_use_tls()

        {

                if (!@extension_loaded('openssl') || !function_exists('stream_socket_enable_crypto') || !function_exists('stream_get_meta_data') || !function_exists('socket_set_blocking') || !function_exists('stream_get_wrappers'))

                {

                        return false;

                }

                /**

                * Make sure the encryption stream is supported

                * Also seem to work without the crypto stream if correctly compiled

                $streams = stream_get_wrappers();

                if (!in_array('streams.crypto', $streams))

                {

                        return false;

                }

                */

                return true;

        }

        /**

        * Sets the resource which is used. No validation is done here, only escaping.

        * @param string $name

        * @access public

        */

        function set_resource($name)

        {

                $this->resource = $name;

        }

        /**

        * Connect

        */

        function connect()

        {

/*                if (!$this->check_jid($this->username . '@' . $this->server))

                {

                        $this->add_to_log('Error: Jabber ID is not valid: ' . $this->username . '@' . $this->server);

                        return false;

                }*/

                $this->session['ssl'] = $this->use_ssl;

                if ($this->open_socket($this->connect_server, $this->port, $this->use_ssl))

                {

                        $this->send("<?xml version='1.0' encoding='UTF-8' ?" . ">\n");

                        $this->send("<stream:stream to='{$this->server}' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>\n");

                }

                else

                {

                        $this->add_to_log('Error: connect() #2');

                        return false;

                }

                // Now we listen what the server has to say...and give appropriate responses

                $this->response($this->listen());

                return true;

        }

        /**

        * Disconnect

        */

        function disconnect()

        {

                if ($this->connected())

                {

                        // disconnect gracefully

                        if (isset($this->session['sent_presence']))

                        {

                                $this->send_presence('offline', '', true);

                        }

                        $this->send('</stream:stream>');

                        $this->session = array();

                        return fclose($this->connection);

                }

                return false;

        }

        /**

        * Connected?

        */

        function connected()

        {

                return (is_resource($this->connection) && !feof($this->connection)) ? true : false;

        }

        /**

        * Initiates login (using data from contructor, after calling connect())

        * @access public

        * @return bool

        */

        function login()

        {

                if (!sizeof($this->features))

                {

                        $this->add_to_log('Error: No feature information from server available.');

                        return false;

                }

                return $this->response($this->features);

        }

        /**

        * Send data to the Jabber server

        * @param string $xml

        * @access public

        * @return bool

        */

        function send($xml)

        {

                if ($this->connected())

                {

                        $xml = trim($xml);

                        $this->add_to_log('SEND: '. $xml);

                        return fwrite($this->connection, $xml);

                }

                else

                {

                        $this->add_to_log('Error: Could not send, connection lost (flood?).');

                        return false;

                }

        }

        /**

        * OpenSocket

        * @param string $server host to connect to

        * @param int $port port number

        * @param bool $use_ssl use ssl or not

        * @access public

        * @return bool

        */

        function open_socket($server, $port, $use_ssl = false)

        {

                if (@function_exists('dns_get_record'))

                {

                        $record = @dns_get_record("_xmpp-client._tcp.$server", DNS_SRV);

                        if (!empty($record) && !empty($record[0]['target']))

                        {

                                $server = $record[0]['target'];

                        }

                }

                $server = $use_ssl ? 'ssl://' . $server : $server;

                if ($this->connection = @fsockopen($server, $port, $errorno, $errorstr, $this->timeout))

                {

                        socket_set_blocking($this->connection, 0);

                        socket_set_timeout($this->connection, 60);

                        return true;

                }

                // Apparently an error occured...

                $this->add_to_log('Error: open_socket() - ' . $errorstr);

                return false;

        }

        /**

        * Return log

        */

        function get_log()

        {

                if ($this->enable_logging && sizeof($this->log_array))

                {

                        return implode("<br /><br />", $this->log_array);

                }

                return '';

        }

        /**

        * Add information to log

        */

        function add_to_log($string)

        {

                if ($this->enable_logging)

                {

                        $this->log_array[] = utf8_htmlspecialchars($string);

                }

        }

        /**

        * Listens to the connection until it gets data or the timeout is reached.

        * Thus, it should only be called if data is expected to be received.

        * @access public

        * @return mixed either false for timeout or an array with the received data

        */

        function listen($timeout = 10, $wait = false)

        {

                if (!$this->connected())

                {

                        return false;

                }

                // Wait for a response until timeout is reached

                $start = time();

                $data = '';

                do

                {

                        $read = trim(fread($this->connection, 4096));

                        $data .= $read;

                }

                while (time() <= $start + $timeout && !feof($this->connection) && ($wait || $data == '' || $read != '' || (substr(rtrim($data), -1) != '>')));

                if ($data != '')

                {

                        $this->add_to_log('RECV: '. $data);

                        return $this->xmlize($data);

                }

                else

                {

                        $this->add_to_log('Timeout, no response from server.');

                        return false;

                }

        }

        /**

        * Initiates account registration (based on data used for contructor)

        * @access public

        * @return bool

        */

        function register()

        {

                if (!isset($this->session['id']) || isset($this->session['jid']))

                {

                        $this->add_to_log('Error: Cannot initiate registration.');

                        return false;

                }

                $this->send("<iq type='get' id='reg_1'><query xmlns='jabber:iq:register'/></iq>");

                return $this->response($this->listen());

        }

        /**

        * Sets account presence. No additional info required (default is "online" status)

        * @param $message online, offline...

        * @param $type dnd, away, chat, xa or nothing

        * @param $unavailable set this to true if you want to become unavailable

        * @access public

        * @return bool

        */

        function send_presence($message = '', $type = '', $unavailable = false)

        {

                if (!isset($this->session['jid']))

                {

                        $this->add_to_log('ERROR: send_presence() - Cannot set presence at this point, no jid given.');

                        return false;

                }

                $type = strtolower($type);

                $type = (in_array($type, array('dnd', 'away', 'chat', 'xa'))) ? '<show>'. $type .'</show>' : '';

                $unavailable = ($unavailable) ? " type='unavailable'" : '';

                $message = ($message) ? '<status>' . utf8_htmlspecialchars($message) .'</status>' : '';

                $this->session['sent_presence'] = !$unavailable;

                return $this->send("<presence$unavailable>" . $type . $message . '</presence>');

        }

        /**

        * This handles all the different XML elements

        * @param array $xml

        * @access public

        * @return bool

        */

        function response($xml)

        {

                if (!is_array($xml) || !sizeof($xml))

                {

                        return false;

                }

                // did we get multiple elements? do one after another

                // array('message' => ..., 'presence' => ...)

                if (sizeof($xml) > 1)

                {

                        foreach ($xml as $key => $value)

                        {

                                $this->response(array($key => $value));

                        }

                        return;

                }

                else

                {

                        // or even multiple elements of the same type?

                        // array('message' => array(0 => ..., 1 => ...))

                        if (sizeof(reset($xml)) > 1)

                        {

                                foreach (reset($xml) as $value)

                                {

                                        $this->response(array(key($xml) => array(0 => $value)));

                                }

                                return;

                        }

                }

                switch (key($xml))

                {

                        case 'stream:stream':

                                // Connection initialised (or after authentication). Not much to do here...

                                if (isset($xml['stream:stream'][0]['#']['stream:features']))

                                {

                                        // we already got all info we need

                                        $this->features = $xml['stream:stream'][0]['#'];

                                }

                                else

                                {

                                        $this->features = $this->listen();

                                }

                                $second_time = isset($this->session['id']);

                                $this->session['id'] = $xml['stream:stream'][0]['@']['id'];

                                if ($second_time)

                                {

                                        // If we are here for the second time after TLS, we need to continue logging in

                                        return $this->login();

                                }

                                // go on with authentication?

                                if (isset($this->features['stream:features'][0]['#']['bind']) || !empty($this->session['tls']))

                                {

                                        return $this->response($this->features);

                                }

                        break;

                        case 'stream:features':

                                // Resource binding after successful authentication

                                if (isset($this->session['authenticated']))

                                {

                                        // session required?

                                        $this->session['sess_required'] = isset($xml['stream:features'][0]['#']['session']);

                                        $this->send("<iq type='set' id='bind_1'>

                                                <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>

                                                        <resource>" . utf8_htmlspecialchars($this->resource) . '</resource>

                                                </bind>

                                        </iq>');

                                        return $this->response($this->listen());

                                }

                                // Let's use TLS if SSL is not enabled and we can actually use it

                                if (!$this->session['ssl'] && $this->can_use_tls() && $this->can_use_ssl() && isset($xml['stream:features'][0]['#']['starttls']))

                                {

                                        $this->add_to_log('Switching to TLS.');

                                        $this->send("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>\n");

                                        return $this->response($this->listen());

                                }

                                // Does the server support SASL authentication?

                                // I hope so, because we do (and no other method).

                                if (isset($xml['stream:features'][0]['#']['mechanisms'][0]['@']['xmlns']) && $xml['stream:features'][0]['#']['mechanisms'][0]['@']['xmlns'] == 'urn:ietf:params:xml:ns:xmpp-sasl')

                                {

                                        // Now decide on method

                                        $methods = array();

                                        foreach ($xml['stream:features'][0]['#']['mechanisms'][0]['#']['mechanism'] as $value)

                                        {

                                                $methods[] = $value['#'];

                                        }

                                        // we prefer DIGEST-MD5

                                        // we don't want to use plain authentication (neither does the server usually) if no encryption is in place

                                        // http://www.xmpp.org/extensions/attic/jep-0078-1.7.html

                                        // The plaintext mechanism SHOULD NOT be used unless the underlying stream is encrypted (using SSL or TLS)

                                        // and the client has verified that the server certificate is signed by a trusted certificate authority.

                                        if (in_array('DIGEST-MD5', $methods))

                                        {

                                                $this->send("<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'/>");

                                        }

                                        else if (in_array('PLAIN', $methods) && ($this->session['ssl'] || !empty($this->session['tls'])))

                                        {

                                                // http://www.ietf.org/rfc/rfc4616.txt (PLAIN SASL Mechanism)

                                                $this->send("<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>"

                                                        . base64_encode($this->username . '@' . $this->server . chr(0) . $this->username . chr(0) . $this->password) .

                                                        '</auth>');

                                        }

                                        else if (in_array('ANONYMOUS', $methods))

                                        {

                                                $this->send("<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='ANONYMOUS'/>");

                                        }

                                        else

                                        {

                                                // not good...

                                                $this->add_to_log('Error: No authentication method supported.');

                                                $this->disconnect();

                                                return false;

                                        }

                                        return $this->response($this->listen());

                                }

                                else

                                {

                                        // ok, this is it. bye.

                                        $this->add_to_log('Error: Server does not offer SASL authentication.');

                                        $this->disconnect();

                                        return false;

                                }

                        break;

                        case 'challenge':

                                // continue with authentication...a challenge literally -_-

                                $decoded = base64_decode($xml['challenge'][0]['#']);

                                $decoded = $this->parse_data($decoded);

                                if (!isset($decoded['digest-uri']))

                                {

                                        $decoded['digest-uri'] = 'xmpp/'. $this->server;

                                }

                                // better generate a cnonce, maybe it's needed

                                $decoded['cnonce'] = base64_encode(md5(uniqid(mt_rand(), true)));

                                // second challenge?

                                if (isset($decoded['rspauth']))

                                {

                                        $this->send("<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>");

                                }

                                else

                                {

                                        // Make sure we only use 'auth' for qop (relevant for $this->encrypt_password())

                                        // If the <response> is choking up on the changed parameter we may need to adjust encrypt_password() directly

                                        if (isset($decoded['qop']) && $decoded['qop'] != 'auth' && strpos($decoded['qop'], 'auth') !== false)

                                        {

                                                $decoded['qop'] = 'auth';

                                        }

                                        $response = array(

                                                'username'        => $this->username,

                                                'response'        => $this->encrypt_password(array_merge($decoded, array('nc' => '00000001'))),

                                                'charset'        => 'utf-8',

                                                'nc'                => '00000001',

                                                'qop'                => 'auth',                        // only auth being supported

                                        );

                                        foreach (array('nonce', 'digest-uri', 'realm', 'cnonce') as $key)

                                        {

                                                if (isset($decoded[$key]))

                                                {

                                                        $response[$key] = $decoded[$key];

                                                }

                                        }

                                        $this->send("<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>" . base64_encode($this->implode_data($response)) . '</response>');

                                }

                                return $this->response($this->listen());

                        break;

                        case 'failure':

                                $this->add_to_log('Error: Server sent "failure".');

                                $this->disconnect();

                                return false;

                        break;

                        case 'proceed':

                                // continue switching to TLS

                                $meta = stream_get_meta_data($this->connection);

                                socket_set_blocking($this->connection, 1);

                                if (!stream_socket_enable_crypto($this->connection, true, STREAM_CRYPTO_METHOD_TLS_CLIENT))

                                {

                                        $this->add_to_log('Error: TLS mode change failed.');

                                        return false;

                                }

                                socket_set_blocking($this->connection, $meta['blocked']);

                                $this->session['tls'] = true;

                                // new stream

                                $this->send("<?xml version='1.0' encoding='UTF-8' ?" . ">\n");

                                $this->send("<stream:stream to='{$this->server}' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>\n");

                                return $this->response($this->listen());

                        break;

                        case 'success':

                                // Yay, authentication successful.

                                $this->send("<stream:stream to='{$this->server}' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>\n");

                                $this->session['authenticated'] = true;

                                // we have to wait for another response

                                return $this->response($this->listen());

                        break;

                        case 'iq':

                                // we are not interested in IQs we did not expect

                                if (!isset($xml['iq'][0]['@']['id']))

                                {

                                        return false;

                                }

                                // multiple possibilities here

                                switch ($xml['iq'][0]['@']['id'])

                                {

                                        case 'bind_1':

                                                $this->session['jid'] = $xml['iq'][0]['#']['bind'][0]['#']['jid'][0]['#'];

                                                // and (maybe) yet another request to be able to send messages *finally*

                                                if ($this->session['sess_required'])

                                                {

                                                        $this->send("<iq to='{$this->server}' type='set' id='sess_1'>

                                                                <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>

                                                                </iq>");

                                                        return $this->response($this->listen());

                                                }

                                                return true;

                                        break;

                                        case 'sess_1':

                                                return true;

                                        break;

                                        case 'reg_1':

                                                $this->send("<iq type='set' id='reg_2'>

                                                                <query xmlns='jabber:iq:register'>

                                                                        <username>" . utf8_htmlspecialchars($this->username) . "</username>

                                                                        <password>" . utf8_htmlspecialchars($this->password) . "</password>

                                                                </query>

                                                        </iq>");

                                                return $this->response($this->listen());

                                        break;

                                        case 'reg_2':

                                                // registration end

                                                if (isset($xml['iq'][0]['#']['error']))

                                                {

                                                        $this->add_to_log('Warning: Registration failed.');

                                                        return false;

                                                }

                                                return true;

                                        break;

                                        case 'unreg_1':

                                                return true;

                                        break;

                                        default:

                                                $this->add_to_log('Notice: Received unexpected IQ.');

                                                return false;

                                        break;

                                }

                        break;

                        case 'message':

                                // we are only interested in content...

                                if (!isset($xml['message'][0]['#']['body']))

                                {

                                        return false;

                                }

                                $message['body'] = $xml['message'][0]['#']['body'][0]['#'];

                                $message['from'] = $xml['message'][0]['@']['from'];

                                if (isset($xml['message'][0]['#']['subject']))

                                {

                                        $message['subject'] = $xml['message'][0]['#']['subject'][0]['#'];

                                }

                                $this->session['messages'][] = $message;

                        break;

                        default:

                                // hm...don't know this response

                                $this->add_to_log('Notice: Unknown server response (' . key($xml) . ')');

                                return false;

                        break;

                }

        }

        function send_message($to, $text, $subject = '', $type = 'normal')

        {

                if (!isset($this->session['jid']))

                {

                        return false;

                }

                if (!in_array($type, array('chat', 'normal', 'error', 'groupchat', 'headline')))

                {

                        $type = 'normal';

                }

                return $this->send("<message from='" . utf8_htmlspecialchars($this->session['jid']) . "' to='" . utf8_htmlspecialchars($to) . "' type='$type' id='" . uniqid('msg') . "'>

                        <subject>" . utf8_htmlspecialchars($subject) . "</subject>

                        <body>" . utf8_htmlspecialchars($text) . "</body>

                        </message>"

                );

        }

        /**

        * Encrypts a password as in RFC 2831

        * @param array $data Needs data from the client-server connection

        * @access public

        * @return string

        */

        function encrypt_password($data)

        {

                // let's me think about <challenge> again...

                foreach (array('realm', 'cnonce', 'digest-uri') as $key)

                {

                        if (!isset($data[$key]))

                        {

                                $data[$key] = '';

                        }

                }

                $pack = md5($this->username . ':' . $data['realm'] . ':' . $this->password);

                if (isset($data['authzid']))

                {

                        $a1 = pack('H32', $pack)  . sprintf(':%s:%s:%s', $data['nonce'], $data['cnonce'], $data['authzid']);

                }

                else

                {

                        $a1 = pack('H32', $pack)  . sprintf(':%s:%s', $data['nonce'], $data['cnonce']);

                }

                // should be: qop = auth

                $a2 = 'AUTHENTICATE:'. $data['digest-uri'];

                return md5(sprintf('%s:%s:%s:%s:%s:%s', md5($a1), $data['nonce'], $data['nc'], $data['cnonce'], $data['qop'], md5($a2)));

        }

        /**

        * parse_data like a="b",c="d",... or like a="a, b", c, d="e", f=g,...

        * @param string $data

        * @access public

        * @return array a => b ...

        */

        function parse_data($data)

        {

                $data = explode(',', $data);

                $pairs = array();

                $key = false;

                foreach ($data as $pair)

                {

                        $dd = strpos($pair, '=');

                        if ($dd)

                        {

                                $key = trim(substr($pair, 0, $dd));

                                $pairs[$key] = trim(trim(substr($pair, $dd + 1)), '"');