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|
<?php
namespace Zotlabs\Module;
use Zotlabs\Lib\Crypto;
use Zotlabs\Web\HTTPSig;
use Zotlabs\Lib\Libzot;
/**
* module: getfile
*
* used for synchronising files and photos across clones
*
* The site initiating the file operation will send a sync packet to known clones.
* They will respond by building the DB structures they require, then will provide a
* post request to this site to grab the file data. This is sent as a stream direct to
* disk at the other end, avoiding memory issues.
*
* Since magic-auth cannot easily be used by the CURL process at the other end,
* we will require a signed request which includes a timestamp. This should not be
* used without SSL and is potentially vulnerable to replay if an attacker decrypts
* the SSL traffic fast enough. The amount of time slop is configurable but defaults
* to 3 minutes.
*
*/
require_once('include/attach.php');
class Getfile extends \Zotlabs\Web\Controller {
function post() {
$header_verified = false;
$hash = $_POST['hash'];
$time = $_POST['time'];
$sig = $_POST['signature'];
$resource = $_POST['resource'];
$revision = intval($_POST['revision']);
if(! $hash)
killme();
foreach([ 'REDIRECT_REMOTE_USER', 'HTTP_AUTHORIZATION' ] as $head) {
if(array_key_exists($head,$_SERVER) && substr(trim($_SERVER[$head]),0,9) === 'Signature') {
if($head !== 'HTTP_AUTHORIZATION') {
$_SERVER['HTTP_AUTHORIZATION'] = $_SERVER[$head];
continue;
}
$sigblock = HTTPSig::parse_sigheader($_SERVER[$head]);
if($sigblock) {
$keyId = $sigblock['keyId'];
if($keyId) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash
where hubloc_id_url = '%s'",
dbesc(str_replace('acct:','',$keyId))
);
if($r) {
$hubloc = Libzot::zot_record_preferred($r);
$verified = HTTPSig::verify('',$hubloc['xchan_pubkey']);
if($verified && $verified['header_signed'] && $verified['header_valid'] && $hash == $hubloc['hubloc_hash']) {
$header_verified = true;
}
}
}
}
}
}
logger('post: ' . print_r($_POST,true),LOGGER_DEBUG,LOG_INFO);
if($header_verified) {
logger('HTTPSig verified');
}
$channel = channelx_by_hash($hash);
if((! $channel) || (! $time) || (! $sig)) {
logger('error: missing info');
killme();
}
if(isset($_POST['resolution']))
$resolution = intval($_POST['resolution']);
elseif(substr($resource,-2,1) == '-') {
$resolution = intval(substr($resource,-1,1));
$resource = substr($resource,0,-2);
}
else {
$resolution = (-1);
}
$slop = intval(get_pconfig($channel['channel_id'],'system','getfile_time_slop'));
if($slop < 1)
$slop = 3;
$d1 = datetime_convert('UTC','UTC',"now + $slop minutes");
$d2 = datetime_convert('UTC','UTC',"now - $slop minutes");
if(! $header_verified) {
if(($time > $d1) || ($time < $d2)) {
logger('time outside allowable range');
killme();
}
if(! Crypto::verify($hash . '.' . $time,base64url_decode($sig),$channel['channel_pubkey'])) {
logger('verify failed.');
killme();
}
}
if($resolution > 0) {
$r = q("SELECT * FROM photo WHERE resource_id = '%s' AND uid = %d AND imgscale = %d LIMIT 1",
dbesc($resource),
intval($channel['channel_id']),
$resolution
);
if($r) {
header('Content-type: ' . $r[0]['mimetype']);
if(intval($r[0]['os_storage'])) {
$fname = dbunescbin($r[0]['content']);
if(strpos($fname,'store') !== false)
$istream = fopen($fname,'rb');
else
$istream = fopen('store/' . $channel['channel_address'] . '/' . $fname,'rb');
$ostream = fopen('php://output','wb');
if($istream && $ostream) {
pipe_streams($istream,$ostream);
fclose($istream);
fclose($ostream);
}
}
else {
echo dbunescbin($r[0]['content']);
}
}
killme();
}
$r = attach_by_hash($resource,$channel['channel_hash'],$revision);
if(! $r['success']) {
logger('attach_by_hash failed: ' . $r['message']);
notice( $r['message'] . EOL);
return;
}
$unsafe_types = array('text/html','text/css','application/javascript');
if(in_array($r['data']['filetype'],$unsafe_types) && (! channel_codeallowed($channel['channel_id']))) {
header('Content-type: text/plain');
}
else {
header('Content-type: ' . $r['data']['filetype']);
}
header('Content-disposition: attachment; filename="' . $r['data']['filename'] . '"');
if(intval($r['data']['os_storage'])) {
$fname = dbunescbin($r['data']['content']);
if(strpos($fname,'store') !== false)
$istream = fopen($fname,'rb');
else
$istream = fopen('store/' . $channel['channel_address'] . '/' . $fname,'rb');
$ostream = fopen('php://output','wb');
if($istream && $ostream) {
pipe_streams($istream,$ostream);
fclose($istream);
fclose($ostream);
}
}
else {
echo dbunescbin($r['data']['content']);
}
killme();
}
}
|
