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<?php
/**
* 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/Contact.php');
function getfile_post(&$a) {
$hash = $_POST['hash'];
$time = $_POST['time'];
$sig = $_POST['signature'];
$resource = $_POST['resource'];
$revision = intval($_POST['revision']);
if(! $hash)
killme();
$channel = channelx_by_hash($hash);
if((! $channel) || (! $time) || (! $sig))
killme();
$slop = intval(get_pconfig($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 - $slop minutes");
if(($time > d1) || ($time < d2)) {
logger('time outside allowable range');
killme();
}
if(! rsa_verify($hash . '.' . $time,base64url_decode($sig),$channel['channel_pubkey'])) {
logger('verify failed.');
killme();
}
$r = attach_by_hash($resource,$revision);
if(! $r['success']) {
notice( $r['message'] . EOL);
return;
}
$unsafe_types = array('text/html','text/css','application/javascript');
if(in_array($r['data']['filetype'],$unsafe_types)) {
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']['data']);
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']['data']);
killme();
}
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