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friendica
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Issue 8663: Prevent abusive behaviour when probing servers

This commit is contained in:
Michael 2020-05-20 06:57:46 +00:00
parent aadaf032ee
commit a77c0194dc
2 changed files with 46 additions and 15 deletions
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54
src/Model/GServer.php
View File

@ -128,13 +128,14 @@ class GServer
/**
* Checks the state of the given server.
*
* @param string $server_url URL of the given server
* @param string $network Network value that is used, when detection failed
* @param boolean $force Force an update.
* @param string $server_url URL of the given server
* @param string $network Network value that is used, when detection failed
* @param boolean $force Force an update.
* @param boolean $only_nodeinfo Only use nodeinfo for server detection
*
* @return boolean 'true' if server seems vital
*/
public static function check(string $server_url, string $network = '', bool $force = false)
public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
{
// Unify the server address
$server_url = trim($server_url, '/');
@ -174,19 +175,38 @@ class GServer
Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
}
return self::detect($server_url, $network);
return self::detect($server_url, $network, $only_nodeinfo);
}
/**
* Set failed server status
*
* @param string $url
*/
private static function setFailure(string $url)
{
if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
Logger::info('Set failed status for existing server', ['url' => $url]);
return;
}
DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
'last_failure' => DateTimeFormat::utcNow()]);
Logger::info('Set failed status for new server', ['url' => $url]);
}
/**
* Detect server data (type, protocol, version number, ...)
* The detected data is then updated or inserted in the gserver table.
*
* @param string $url URL of the given server
* @param string $network Network value that is used, when detection failed
* @param string $url URL of the given server
* @param string $network Network value that is used, when detection failed
* @param boolean $only_nodeinfo Only use nodeinfo for server detection
*
* @return boolean 'true' if server could be detected
*/
public static function detect(string $url, string $network = '')
public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
{
Logger::info('Detect server type', ['server' => $url]);
$serverdata = [];
@ -210,11 +230,16 @@ class GServer
$xrd_timeout = DI::config()->get('system', 'xrd_timeout');
$curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
if ($curlResult->isTimeout()) {
DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
self::setFailure($url);
return false;
}
$nodeinfo = self::fetchNodeinfo($url, $curlResult);
if ($only_nodeinfo && empty($nodeinfo)) {
Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
self::setFailure($url);
return false;
}
// When nodeinfo isn't present, we use the older 'statistics.json' endpoint
if (empty($nodeinfo)) {
@ -233,7 +258,7 @@ class GServer
}
if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
self::setFailure($url);
return false;
}
}
@ -246,7 +271,7 @@ class GServer
// With this check we don't have to waste time and ressources for dead systems.
// Also this hopefully prevents us from receiving abuse messages.
if (empty($serverdata['network']) && !self::validHostMeta($url)) {
DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
self::setFailure($url);
return false;
}
@ -481,6 +506,10 @@ class GServer
*/
private static function fetchNodeinfo(string $url, CurlResult $curlResult)
{
if (!$curlResult->isSuccess()) {
return [];
}
$nodeinfo = json_decode($curlResult->getBody(), true);
if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
@ -1430,7 +1459,8 @@ class GServer
if (!empty($servers['pods'])) {
foreach ($servers['pods'] as $server) {
Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host']);
// Using "only_nodeinfo" since servers that are listed on that page should always have it.
Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
}
}
}

7
src/Worker/UpdateGServer.php
View File

@ -29,9 +29,10 @@ class UpdateGServer
{
/**
* Update the given server
* @param string $server_url Server URL
* @param string $server_url Server URL
* @param boolean $only_nodeinfo Only use nodeinfo for server detection
*/
public static function execute($server_url)
public static function execute(string $server_url, bool $only_nodeinfo = false)
{
if (empty($server_url)) {
return;
@ -42,7 +43,7 @@ class UpdateGServer
return;
}
$ret = GServer::check($server_url);
$ret = GServer::check($server_url, '', false, $only_nodeinfo);
Logger::info('Updated gserver', ['url' => $server_url, 'result' => $ret]);
}
}