<?php require_once('include/items.php'); require_once('include/auth.php'); function dfrn_poll_init(&$a) { $dfrn_id = ((x($_GET,'dfrn_id')) ? $_GET['dfrn_id'] : ''); $type = ((x($_GET,'type')) ? $_GET['type'] : 'data'); $last_update = ((x($_GET,'last_update')) ? $_GET['last_update'] : ''); $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url'] : ''); $challenge = ((x($_GET,'challenge')) ? $_GET['challenge'] : ''); $sec = ((x($_GET,'sec')) ? $_GET['sec'] : ''); $dfrn_version = ((x($_GET,'dfrn_version')) ? (float) $_GET['dfrn_version'] : 2.0); $direction = (-1); if(strpos($dfrn_id,':') == 1) { $direction = intval(substr($dfrn_id,0,1)); $dfrn_id = substr($dfrn_id,2); } if(($dfrn_id === '') && (! x($_POST,'dfrn_id')) && ($a->argc > 1)) { header("Content-type: application/atom+xml"); $o = get_feed_for($a, '*', $a->argv[1],$last_update); echo $o; killme(); } if(($type === 'profile') && (! strlen($sec))) { $sql_extra = ''; switch($direction) { case (-1): $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id)); $my_id = $dfrn_id; break; case 0: $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '1:' . $dfrn_id; break; case 1: $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '0:' . $dfrn_id; break; default: goaway($a->get_baseurl()); break; // NOTREACHED } $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1", dbesc($a->argv[1]) ); if(count($r)) { $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check'); logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA); if(strlen($s)) { $xml = simplexml_load_string($s); if((int) $xml->status == 1) { $_SESSION['authenticated'] = 1; $_SESSION['visitor_id'] = $r[0]['id']; notice( $r[0]['username'] . t(' welcomes ') . $r[0]['name'] . EOL); // Visitors get 1 day session. $session_id = session_id(); $expire = time() + 86400; q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1", dbesc($expire), dbesc($session_id) ); } } $profile = $r[0]['nickname']; goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile); } goaway($a->get_baseurl()); } if($type === 'profile-check') { if((strlen($challenge)) && (strlen($sec))) { q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time())); $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1", dbesc($sec) ); if(! count($r)) { xml_status(3); // NOTREACHED } $orig_id = $r[0]['dfrn_id']; if(strpos(':',$orig_id)) $orig_id = substr($orig_id,2); $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($r[0]['cid']) ); if(! count($c)) { xml_status(3); } $contact = $c[0]; $sent_dfrn_id = hex2bin($dfrn_id); $challenge = hex2bin($challenge); $final_dfrn_id = ''; if(($contact['duplex']) && strlen($contact['prvkey'])) { openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']); openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']); } else { openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']); openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']); } $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.')); if(strpos($final_dfrn_id,':') == 1) $final_dfrn_id = substr($final_dfrn_id,2); if($final_dfrn_id != $orig_id) { // did not decode properly - cannot trust this site xml_status(3); } header("Content-type: text/xml"); echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>"; killme(); // NOTREACHED } else { // old protocol switch($direction) { case 1: $dfrn_id = '0:' . $dfrn_id; break; case 0: $dfrn_id = '1:' . $dfrn_id; break; default: break; } q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time())); $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC", dbesc($dfrn_id)); if(count($r)) { xml_status(1); return; // NOTREACHED } xml_status(0); return; // NOTREACHED } } } function dfrn_poll_post(&$a) { $dfrn_id = ((x($_POST,'dfrn_id')) ? $_POST['dfrn_id'] : ''); $challenge = ((x($_POST,'challenge')) ? $_POST['challenge'] : ''); $url = ((x($_POST,'url')) ? $_POST['url'] : ''); $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0); $direction = (-1); if(strpos($dfrn_id,':') == 1) { $direction = intval(substr($dfrn_id,0,1)); $dfrn_id = substr($dfrn_id,2); } $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1", dbesc($dfrn_id), dbesc($challenge) ); if(! count($r)) killme(); $type = $r[0]['type']; $last_update = $r[0]['last_update']; $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1", dbesc($dfrn_id), dbesc($challenge) ); $sql_extra = ''; switch($direction) { case (-1): $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id)); $my_id = $dfrn_id; break; case 0: $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '1:' . $dfrn_id; break; case 1: $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '0:' . $dfrn_id; break; default: goaway($a->get_baseurl()); break; // NOTREACHED } $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1"); if(! count($r)) killme(); $owner_uid = $r[0]['uid']; $contact_id = $r[0]['id']; if($type === 'reputation' && strlen($url)) { $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1", dbesc($url), intval($owner_uid) ); $reputation = 0; $text = ''; if(count($r)) { $reputation = $r[0]['rating']; $text = $r[0]['reason']; if($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed $reputation = 0; $text = ''; } } echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?> <reputation> <url>$url</url> <rating>$reputation</rating> <description>$text</description> </reputation> "; killme(); // NOTREACHED } else { header("Content-type: application/atom+xml"); $o = get_feed_for($a,$dfrn_id, $a->argv[1], $last_update, $direction); echo $o; killme(); } } function dfrn_poll_content(&$a) { $dfrn_id = ((x($_GET,'dfrn_id')) ? $_GET['dfrn_id'] : ''); $type = ((x($_GET,'type')) ? $_GET['type'] : 'data'); $last_update = ((x($_GET,'last_update')) ? $_GET['last_update'] : ''); $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url'] : ''); $sec = ((x($_GET,'sec')) ? $_GET['sec'] : ''); $dfrn_version = ((x($_GET,'dfrn_version')) ? (float) $_GET['dfrn_version'] : 2.0); $direction = (-1); if(strpos($dfrn_id,':') == 1) { $direction = intval(substr($dfrn_id,0,1)); $dfrn_id = substr($dfrn_id,2); } if($dfrn_id != '') { // initial communication from external contact $hash = random_string(); $status = 0; $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time())); if($type !== 'profile') { $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` ) VALUES( '%s', '%s', '%s', '%s', '%s' ) ", dbesc($hash), dbesc($dfrn_id), intval(time() + 60 ), dbesc($type), dbesc($last_update) ); } $sql_extra = ''; switch($direction) { case (-1): if($type === 'profile') $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id)); else $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id)); $my_id = $dfrn_id; break; case 0: $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '1:' . $dfrn_id; break; case 1: $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id)); $my_id = '0:' . $dfrn_id; break; default: goaway($a->get_baseurl()); break; // NOTREACHED } $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1", dbesc($a->argv[1]) ); if(count($r)) { $challenge = ''; $encrypted_id = ''; $id_str = $my_id . '.' . mt_rand(1000,9999); if($r[0]['duplex'] && strlen($r[0]['pubkey'])) { openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']); openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']); } else { openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']); openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']); } $challenge = bin2hex($challenge); $encrypted_id = bin2hex($encrypted_id); } else { $status = 1; $challenge = ''; $encrypted_id = ''; } if(($type === 'profile') && (strlen($sec))) { // URL reply $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $encrypted_id . '&type=profile-check' . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&challenge=' . $challenge . '&sec=' . $sec ); logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA); if(strlen($s) && strstr($s,'<?xml')) { $xml = simplexml_load_string($s); logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA); logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash); logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec); if(((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) { $_SESSION['authenticated'] = 1; $_SESSION['visitor_id'] = $r[0]['id']; notice( $r[0]['username'] . t(' welcomes ') . $r[0]['name'] . EOL); // Visitors get 1 day session. $session_id = session_id(); $expire = time() + 86400; q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1", dbesc($expire), dbesc($session_id) ); } $profile = $r[0]['nickname']; goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile); } goaway($a->get_baseurl()); // NOTREACHED } else { // XML reply header("Content-type: text/xml"); echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n" . '<dfrn_poll>' . "\r\n" . "\t" . '<status>' . $status . '</status>' . "\r\n" . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n" . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n" . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n" . '</dfrn_poll>' . "\r\n" ; killme(); // NOTREACHED } } }