Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file mod/dfrn_poll.php
*/
use Friendica\App;
use Friendica\Core\Config;
use Friendica\Core\L10n;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Core\Session;
use Friendica\Database\DBA;
use Friendica\Module\Login;
use Friendica\Protocol\DFRN;
use Friendica\Protocol\OStatus;
use Friendica\Util\Network;
use Friendica\Util\Strings;
use Friendica\Util\XML;
function dfrn_poll_init(App $a)
{
Login::sessionAuth();
$dfrn_id = defaults($_GET, 'dfrn_id' , '');
$type = defaults($_GET, 'type' , 'data');
$last_update = defaults($_GET, 'last_update' , '');
$destination_url = defaults($_GET, 'destination_url', '');
$challenge = defaults($_GET, 'challenge' , '');
$sec = defaults($_GET, 'sec' , '');
$dfrn_version = (float) defaults($_GET, 'dfrn_version' , 2.0);
$quiet = !empty($_GET['quiet']);
// Possibly it is an OStatus compatible server that requests a user feed
$user_agent = defaults($_SERVER, 'HTTP_USER_AGENT', '');
if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) {
$nickname = $a->argv[1];
header("Content-type: application/atom+xml");
echo OStatus::feed($nickname, $last_update, 10);
exit();
}
$direction = -1;
if (strpos($dfrn_id, ':') == 1) {
$direction = intval(substr($dfrn_id, 0, 1));
$dfrn_id = substr($dfrn_id, 2);
}
$hidewall = false;
if (($dfrn_id === '') && empty($_POST['dfrn_id'])) {
if (Config::get('system', 'block_public') && !Session::isAuthenticated()) {
throw new \Friendica\Network\HTTPException\ForbiddenException();
}
$user = '';
if ($a->argc > 1) {
$r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
DBA::escape($a->argv[1])
);
if (!$r) {
throw new \Friendica\Network\HTTPException\NotFoundException();
}
$hidewall = ($r[0]['hidewall'] && !local_user());
$user = $r[0]['nickname'];
}
Logger::log('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
header("Content-type: application/atom+xml");
echo DFRN::feed('', $user, $last_update, 0, $hidewall);
exit();
}
if (($type === 'profile') && (!strlen($sec))) {
$sql_extra = '';
switch ($direction) {
case -1:
$sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
$my_id = $dfrn_id;
break;
case 0:
$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
$my_id = '1:' . $dfrn_id;
break;
case 1:
$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
$my_id = '0:' . $dfrn_id;
break;
default:
$a->internalRedirect();
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' $sql_extra LIMIT 1",
DBA::escape($a->argv[1])
);
if (DBA::isResult($r)) {
$s = Network::fetchUrl($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
Logger::log("dfrn_poll: old profile returns " . $s, Logger::DATA);
if (strlen($s)) {
$xml = XML::parseString($s);
if ((int)$xml->status === 1) {
$_SESSION['authenticated'] = 1;
$_SESSION['visitor_id'] = $r[0]['id'];
$_SESSION['visitor_home'] = $r[0]['url'];
$_SESSION['visitor_handle'] = $r[0]['addr'];
$_SESSION['visitor_visiting'] = $r[0]['uid'];
$_SESSION['my_url'] = $r[0]['url'];
Session::setVisitorsContacts();
if (!$quiet) {
info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
}
// Visitors get 1 day session.
$session_id = session_id();
$expire = time() + 86400;
q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
DBA::escape($expire),
DBA::escape($session_id)
);
}
}
$profile = (count($r) > 0 && isset($r[0]['nickname']) ? $r[0]['nickname'] : '');
if (!empty($destination_url)) {
System::externalRedirect($destination_url);
} else {
$a->internalRedirect('profile/' . $profile);
}
}
$a->internalRedirect();
}
if ($type === 'profile-check' && $dfrn_version < 2.2) {
if ((strlen($challenge)) && (strlen($sec))) {
DBA::delete('profile_check', ["`expire` < ?", time()]);
$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
DBA::escape($sec)
);
if (!DBA::isResult($r)) {
System::xmlExit(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 (!DBA::isResult($c)) {
System::xmlExit(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::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
// did not decode properly - cannot trust this site
System::xmlExit(3, 'Bad decryption');
}
header("Content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
exit();
// NOTREACHED
} else {
// old protocol
switch ($direction) {
case 1:
$dfrn_id = '0:' . $dfrn_id;
break;
case 0:
$dfrn_id = '1:' . $dfrn_id;
break;
default:
break;
}
DBA::delete('profile_check', ["`expire` < ?", time()]);
$r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
DBA::escape($dfrn_id));
if (DBA::isResult($r)) {
System::xmlExit(1);
return; // NOTREACHED
}
System::xmlExit(0);
return; // NOTREACHED
}
}
}
function dfrn_poll_post(App $a)
{
$dfrn_id = defaults($_POST, 'dfrn_id' , '');
$challenge = defaults($_POST, 'challenge', '');
$url = defaults($_POST, 'url' , '');
$sec = defaults($_POST, 'sec' , '');
$ptype = defaults($_POST, 'type' , '');
$perm = defaults($_POST, 'perm' , 'r');
$dfrn_version = !empty($_POST['dfrn_version']) ? (float) $_POST['dfrn_version'] : 2.0;
if ($ptype === 'profile-check') {
if (strlen($challenge) && strlen($sec)) {
Logger::log('dfrn_poll: POST: profile-check');
DBA::delete('profile_check', ["`expire` < ?", time()]);
$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
DBA::escape($sec)
);
if (!DBA::isResult($r)) {
System::xmlExit(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 (!DBA::isResult($c)) {
System::xmlExit(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::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
// did not decode properly - cannot trust this site
System::xmlExit(3, 'Bad decryption');
}
header("Content-type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
exit();
// NOTREACHED
}
}
$direction = -1;
if (strpos($dfrn_id, ':') == 1) {
$direction = intval(substr($dfrn_id, 0, 1));
$dfrn_id = substr($dfrn_id, 2);
}
$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
DBA::escape($dfrn_id),
DBA::escape($challenge)
);
if (!DBA::isResult($r)) {
exit();
}
$type = $r[0]['type'];
$last_update = $r[0]['last_update'];
DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
$sql_extra = '';
switch ($direction) {
case -1:
$sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
break;
case 0:
$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
break;
case 1:
$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
break;
default:
$a->internalRedirect();
break; // NOTREACHED
}
$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
if (!DBA::isResult($r)) {
exit();
}
$contact = $r[0];
$owner_uid = $r[0]['uid'];
$contact_id = $r[0]['id'];
if ($type === 'reputation' && strlen($url)) {
$r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
DBA::escape($url),
intval($owner_uid)
);
$reputation = 0;
$text = '';
if (DBA::isResult($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>
";
exit();
// NOTREACHED
} else {
// Update the writable flag if it changed
Logger::log('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 != $contact['writable']) {
q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
intval($writable),
intval($contact_id)
);
}
}
header("Content-type: application/atom+xml");
$o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
echo $o;
exit();
}
}
function dfrn_poll_content(App $a)
{
$dfrn_id = defaults($_GET, 'dfrn_id' , '');
$type = defaults($_GET, 'type' , 'data');
$last_update = defaults($_GET, 'last_update' , '');
$destination_url = defaults($_GET, 'destination_url', '');
$sec = defaults($_GET, 'sec' , '');
$dfrn_version = !empty($_GET['dfrn_version']) ? (float) $_GET['dfrn_version'] : 2.0;
$quiet = !empty($_GET['quiet']);
$direction = -1;
if (strpos($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 = Strings::getRandomHex();
$status = 0;
DBA::delete('challenge', ["`expire` < ?", time()]);
if ($type !== 'profile') {
q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
DBA::escape($hash),
DBA::escape($dfrn_id),
intval(time() + 60 ),
DBA::escape($type),
DBA::escape($last_update)
);
}
$sql_extra = '';
switch ($direction) {
case -1:
if ($type === 'profile') {
$sql_extra = sprintf(" AND (`dfrn-id` = '%s' OR `issued-id` = '%s') ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
} else {
$sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
}
$my_id = $dfrn_id;
break;
case 0:
$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
$my_id = '1:' . $dfrn_id;
break;
case 1:
$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
$my_id = '0:' . $dfrn_id;
break;
default:
$a->internalRedirect();
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' $sql_extra LIMIT 1",
DBA::escape($nickname)
);
if (DBA::isResult($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($sec))) {
// heluecht: I don't know why we don't fail immediately when the user or contact hadn't been found.
// Since it doesn't make sense to continue from this point on, we now fail here. This should be safe.
if (!DBA::isResult($r)) {
throw new \Friendica\Network\HTTPException\NotFoundException();
}
// URL reply
if ($dfrn_version < 2.2) {
$s = Network::fetchUrl($r[0]['poll']
. '?dfrn_id=' . $encrypted_id
. '&type=profile-check'
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION
. '&challenge=' . $challenge
. '&sec=' . $sec
);
} else {
$s = Network::post($r[0]['poll'], [
'dfrn_id' => $encrypted_id,
'type' => 'profile-check',
'dfrn_version' => DFRN_PROTOCOL_VERSION,
'challenge' => $challenge,
'sec' => $sec
])->getBody();
}
Logger::log("dfrn_poll: sec profile: " . $s, Logger::DATA);
if (strlen($s) && strstr($s, '<?xml')) {
$xml = XML::parseString($s);
Logger::log('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), Logger::DATA);
Logger::log('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
Logger::log('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'];
$_SESSION['visitor_home'] = $r[0]['url'];
$_SESSION['visitor_visiting'] = $r[0]['uid'];
$_SESSION['my_url'] = $r[0]['url'];
Session::setVisitorsContacts();
if (!$quiet) {
info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
}
// Visitors get 1 day session.
$session_id = session_id();
$expire = time() + 86400;
q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
DBA::escape($expire),
DBA::escape($session_id)
);
}
}
$profile = ((DBA::isResult($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
switch ($destination_url) {
case 'profile':
$a->internalRedirect('profile/' . $profile . '?f=&tab=profile');
break;
case 'photos':
$a->internalRedirect('photos/' . $profile);
break;
case 'status':
case '':
$a->internalRedirect('profile/' . $profile);
break;
default:
$appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
$a->redirect($destination_url . $appendix);
break;
}
// 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";
exit();
// NOTREACHED
}
}
}