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<?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);
$perm = ((x($_GET,'perm')) ? $_GET['perm'] : 'r');
$direction = (-1);
if(strpos($dfrn_id,':') == 1) {
$direction = intval(substr($dfrn_id,0,1));
$dfrn_id = substr($dfrn_id,2);
}
if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
killme();
}
$user = '';
if($a->argc > 1) {
$r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
dbesc($a->argv[1])
);
if((! count($r)) || (count($r) && $r[0]['hidewall']))
killme();
$user = $r[0]['nickname'];
}
logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
header("Content-type: application/atom+xml");
echo get_feed_for($a, '', $user,$last_update);
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(z_root());
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)) {
$xml = parse_xml_string($s);
if((int) $xml->status == 1) {
$_SESSION['authenticated'] = 1;
if(! x($_SESSION,'remote'))
$_SESSION['remote'] = array();
$_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
$_SESSION['visitor_id'] = $r[0]['id'];
$_SESSION['visitor_home'] = $r[0]['url'];
$_SESSION['visitor_handle'] = $r[0]['addr'];
$_SESSION['visitor_visiting'] = $r[0]['uid'];
info( sprintf(t('%s welcomes %s'), $r[0]['username'] , $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/' . $profile);
}
goaway(z_root());
}
if($type === 'profile-check' && $dfrn_version < 2.2 ) {
if((strlen($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, 'No ticket');
// 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, 'No profile');
}
$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) {
logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
// did not decode properly - cannot trust this site
xml_status(3, 'Bad decryption');
}
header("Content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$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'] : '');
$sec = ((x($_POST,'sec')) ? $_POST['sec'] : '');
$ptype = ((x($_POST,'type')) ? $_POST['type'] : '');
$dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
$perm = ((x($_POST,'perm')) ? $_POST['perm'] : 'r');
if($ptype === 'profile-check') {
if((strlen($challenge)) && (strlen($sec))) {
logger('dfrn_poll: POST: profile-check');
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, 'No ticket');
// 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, 'No profile');
}
$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) {
logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
// did not decode properly - cannot trust this site
xml_status(3, 'Bad decryption');
}
header("Content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
killme();
// NOTREACHED
}
}
$direction = (-1);
if(strpos($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(z_root());
break; // NOTREACHED
}
$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
if(! count($r))
killme();
$contact = $r[0];
$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 {
// Update the writable flag if it changed
logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
if($dfrn_version >= 2.21) {
if($perm === 'rw')
$writable = 1;
else
$writable = 0;
if($writable != $contact['writable']) {
q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d LIMIT 1",
intval($writable),
intval($contact_id)
);
}
}
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);
$perm = ((x($_GET,'perm')) ? $_GET['perm'] : 'r');
$direction = (-1);
if(strpos($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(z_root());
break; // NOTREACHED
}
$nickname = $a->argv[1];
$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' $sql_extra LIMIT 1",
dbesc($nickname)
);
if(count($r)) {
$challenge = '';
$encrypted_id = '';
$id_str = $my_id . '.' . mt_rand(1000,9999);
if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
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($sec))) {
// URL reply
if($dfrn_version < 2.2) {
$s = fetch_url($r[0]['poll']
. '?dfrn_id=' . $encrypted_id
. '&type=profile-check'
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
. '&challenge=' . $challenge
. '&sec=' . $sec
);
}
else {
$s = post_url($r[0]['poll'], array(
'dfrn_id' => $encrypted_id,
'type' => 'profile-check',
'dfrn_version' => DFRN_PROTOCOL_VERSION,
'challenge' => $challenge,
'sec' => $sec
));
}
$profile = ((count($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
switch($destination_url) {
case 'profile':
$dest = $a->get_baseurl() . '/profile/' . $profile . '?tab=profile';
break;
case 'photos':
$dest = $a->get_baseurl() . '/photos/' . $profile;
break;
case 'status':
case '':
$dest = $a->get_baseurl() . '/profile/' . $profile;
break;
default:
$dest = $destination_url;
break;
}
logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
if(strlen($s) && strstr($s,'<?xml')) {
$xml = parse_xml_string($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)) {
$_SESSION['authenticated'] = 1;
if(! x($_SESSION,'remote'))
$_SESSION['remote'] = array();
$_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
$_SESSION['visitor_id'] = $r[0]['id'];
$_SESSION['visitor_home'] = $r[0]['url'];
$_SESSION['visitor_visiting'] = $r[0]['uid'];
info( sprintf(t('%s welcomes %s'), $r[0]['username'] , $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($session_id)
);
}
goaway($dest);
}
goaway($dest);
// 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
}
}
}
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