mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/AbuseFilter.git
synced 2024-11-15 10:15:24 +00:00
0b7902fe6e
They're currently stored separately, so move matches count together with other per-filter data to keep it consistent. This also removes a parameter from filterMatchesKey, as it's not needed anymore. Split from child patch by Dragons flight. Bug: T53294 Depends-On: I8f47beb73cfc1b63c4b3c809fc6d65a1e66ee334 Change-Id: I2d8c8f8278073a9420e3eb373fb89a655925618a
1295 lines
39 KiB
PHP
1295 lines
39 KiB
PHP
<?php
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use MediaWiki\Block\DatabaseBlock;
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use MediaWiki\Logger\LoggerFactory;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\Session\SessionManager;
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use Wikimedia\Rdbms\IDatabase;
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/**
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* This class contains the logic for executing abuse filters and their actions. The entry points are
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* run() and runForStash(). Note that run() can only be executed once on a given instance.
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* @todo In a perfect world, every time this class gets constructed we should have a context
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* source at hand. Unfortunately, this currently isn't true, as the hooks used for filtering
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* don't pass a full context. If they did, this class would just extend ContextSource and use
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* that to retrieve user, title, globals etc.
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*/
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class AbuseFilterRunner {
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/**
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* @var User The user who performed the action being filtered
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*/
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protected $user;
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/**
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* @var Title The title where the action being filtered was performed
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*/
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protected $title;
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/**
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* @var AbuseFilterVariableHolder The variables for the current action
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*/
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protected $vars;
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/**
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* @var string The group of filters to check (as defined in $wgAbuseFilterValidGroups)
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*/
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protected $group;
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/**
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* @var array Data from per-filter profiling. Shape:
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*
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* [
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* filterID => [ 'time' => timeTaken, 'conds' => condsUsed, 'result' => result ]
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* ]
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*
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* Where 'timeTaken' is in seconds, 'result' is a boolean indicating whether the filter matched
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* the action, and 'filterID' is "{prefix}-{ID}" ; Prefix should be empty for local
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* filters. In stash mode this member is saved in cache, while in execute mode it's used to
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* update profiling after checking all filters.
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*/
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protected $profilingData;
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/**
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* @var AbuseFilterParser The parser instance to use to check all filters
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* @protected Public for back-compat only, will be made protected. self::init already handles
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* building a parser object.
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*/
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public $parser;
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/**
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* @var bool Whether a run() was already performed. Used to avoid multiple executions with the
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* same members.
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*/
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private $executed = false;
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/**
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* @param User $user The user who performed the action being filtered
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* @param Title $title The title where the action being filtered was performed
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* @param AbuseFilterVariableHolder $vars The variables for the current action
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* @param string $group The group of filters to check. It must be defined as so in
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* $wgAbuseFilterValidGroups, or this will throw.
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* @throws InvalidArgumentException
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*/
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public function __construct( User $user, Title $title, AbuseFilterVariableHolder $vars, $group ) {
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global $wgAbuseFilterValidGroups;
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if ( !in_array( $group, $wgAbuseFilterValidGroups ) ) {
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throw new InvalidArgumentException( '$group must be defined in $wgAbuseFilterValidGroups' );
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}
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$this->user = $user;
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$this->title = $title;
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$this->vars = $vars;
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$this->group = $group;
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}
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/**
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* Inits variables and parser right before running
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*/
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private function init() {
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// Add vars from extensions
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Hooks::run( 'AbuseFilter-filterAction', [ &$this->vars, $this->title ] );
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Hooks::run( 'AbuseFilterAlterVariables', [ &$this->vars, $this->title, $this->user ] );
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$this->vars->addHolders( AbuseFilter::generateStaticVars() );
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$this->vars->forFilter = true;
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$this->vars->setVar( 'timestamp', (int)wfTimestamp( TS_UNIX ) );
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$this->parser = $this->getParser();
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$this->profilingData = [];
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}
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/**
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* @return AbuseFilterParser
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*/
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protected function getParser() : AbuseFilterParser {
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global $wgAbuseFilterParserClass;
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return new $wgAbuseFilterParserClass( $this->vars );
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}
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/**
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* The main entry point of this class. This method runs all filters and takes their consequences.
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*
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* @param bool $allowStash Whether we are allowed to check the cache to see if there's a cached
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* result of a previous execution for the same edit.
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* @throws BadMethodCallException If run() was already called on this instance
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* @return Status Good if no action has been taken, a fatal otherwise.
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*/
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public function run( $allowStash = true ) : Status {
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if ( $this->executed ) {
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throw new BadMethodCallException( 'run() was already called on this instance.' );
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}
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$this->executed = true;
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$this->init();
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$useStash = $allowStash && $this->vars->getVar( 'action' )->toString() === 'edit';
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$fromCache = false;
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$result = [];
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if ( $useStash ) {
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$cacheData = $this->seekCache();
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if ( $cacheData !== false ) {
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// Merge in any tags to apply to recent changes entries
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AbuseFilter::bufferTagsToSetByAction( $cacheData['tags'] );
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// Use cached vars (T176291) and profiling data (T191430)
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$this->vars = AbuseFilterVariableHolder::newFromArray( $cacheData['vars'] );
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$result = [
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'matches' => $cacheData['matches'],
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'runtime' => $cacheData['runtime'],
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'condCount' => $cacheData['condCount'],
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'profiling' => $cacheData['profiling']
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];
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$fromCache = true;
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}
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}
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if ( !$fromCache ) {
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$startTime = microtime( true );
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// This also updates $this->profilingData and $this->parser->mCondCount used later
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$matches = $this->checkAllFilters();
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$timeTaken = ( microtime( true ) - $startTime ) * 1000;
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$result = [
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'matches' => $matches,
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'runtime' => $timeTaken,
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'condCount' => $this->parser->getCondCount(),
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'profiling' => $this->profilingData
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];
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}
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$matchedFilters = array_keys( array_filter( $result['matches'] ) );
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$this->recordRuntimeProfilingResult(
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count( $matchedFilters ),
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$result['condCount'],
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$result['runtime']
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);
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$this->recordPerFilterProfiling( $result['profiling'] );
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$this->recordStats( $result['condCount'] );
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if ( count( $matchedFilters ) === 0 ) {
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return Status::newGood();
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}
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$status = $this->executeFilterActions( $matchedFilters );
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$actionsTaken = $status->getValue();
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$this->addLogEntries( $actionsTaken );
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return $status;
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}
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/**
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* Similar to run(), but runs in "stash" mode, which means filters are executed, no actions are
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* taken, and the result is saved in cache to be later reused. This can only be used for edits,
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* and not doing so will throw.
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*
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* @throws InvalidArgumentException
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* @return Status Always a good status, since we're only saving data.
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*/
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public function runForStash() : Status {
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$action = $this->vars->getVar( 'action' )->toString();
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if ( $action !== 'edit' ) {
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throw new InvalidArgumentException(
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__METHOD__ . " can only be called for edits, called for action $action."
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);
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}
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$this->init();
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$cache = ObjectCache::getLocalClusterInstance();
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$stashKey = $this->getStashKey( $cache );
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$startTime = microtime( true );
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$matchedFilters = $this->checkAllFilters();
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// Save the filter stash result and do nothing further
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$cacheData = [
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'matches' => $matchedFilters,
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'tags' => AbuseFilter::$tagsToSet,
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'condCount' => $this->parser->getCondCount(),
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'runtime' => ( microtime( true ) - $startTime ) * 1000,
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'vars' => $this->vars->dumpAllVars(),
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'profiling' => $this->profilingData
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];
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$cache->set( $stashKey, $cacheData, $cache::TTL_MINUTE );
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$this->logCache( 'store', $stashKey );
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return Status::newGood();
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}
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/**
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* Search the cache to find data for a previous execution done for the current edit.
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*
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* @return false|array False on failure, the array with data otherwise
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*/
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protected function seekCache() {
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$cache = ObjectCache::getLocalClusterInstance();
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$stashKey = $this->getStashKey( $cache );
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$ret = $cache->get( $stashKey );
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$status = $ret !== false ? 'hit' : 'miss';
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$this->logCache( $status, $stashKey );
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return $ret;
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}
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/**
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* Get the stash key for the current variables
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*
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* @param BagOStuff $cache
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* @return string
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*/
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protected function getStashKey( BagOStuff $cache ) {
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$inputVars = $this->vars->exportNonLazyVars();
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// Exclude noisy fields that have superficial changes
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$excludedVars = [
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'old_html' => true,
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'new_html' => true,
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'user_age' => true,
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'timestamp' => true,
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'page_age' => true,
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'moved_from_age' => true,
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'moved_to_age' => true
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];
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$inputVars = array_diff_key( $inputVars, $excludedVars );
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ksort( $inputVars );
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$hash = md5( serialize( $inputVars ) );
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return $cache->makeKey(
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'abusefilter',
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'check-stash',
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$this->group,
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$hash,
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'v1'
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);
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}
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/**
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* Log cache operations related to stashed edits, i.e. store, hit and miss
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*
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* @param string $type Either 'store', 'hit' or 'miss'
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* @param string $key The cache key used
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* @throws InvalidArgumentException
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*/
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protected function logCache( $type, $key ) {
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if ( !in_array( $type, [ 'store', 'hit', 'miss' ] ) ) {
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throw new InvalidArgumentException( '$type must be either "store", "hit" or "miss"' );
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}
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$logger = LoggerFactory::getInstance( 'StashEdit' );
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// Bots do not use edit stashing, so avoid distorting the stats
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$statsd = $this->user->isBot()
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? new NullStatsdDataFactory()
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: MediaWikiServices::getInstance()->getStatsdDataFactory();
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$logger->debug( __METHOD__ . ": cache $type for '{$this->title}' (key $key)." );
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$statsd->increment( "abusefilter.check-stash.$type" );
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}
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/**
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* Returns an associative array of filters which were tripped
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*
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* @protected Public for back compat only; this will actually be made protected in the future.
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* You should either rely on $this->run() or subclass this class.
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* @todo This method should simply return an array with IDs of matched filters as values,
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* since we always end up filtering it after calling this method.
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* @return bool[] Map of (integer filter ID => bool)
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*/
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public function checkAllFilters() : array {
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global $wgAbuseFilterCentralDB, $wgAbuseFilterIsCentral, $wgAbuseFilterConditionLimit;
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// Ensure that we start fresh, see T193374
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$this->parser->resetCondCount();
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// Fetch filters to check from the database.
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$matchedFilters = [];
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$dbr = wfGetDB( DB_REPLICA );
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$res = $dbr->select(
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'abuse_filter',
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AbuseFilter::$allAbuseFilterFields,
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[
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'af_enabled' => 1,
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'af_deleted' => 0,
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'af_group' => $this->group,
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],
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__METHOD__
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);
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foreach ( $res as $row ) {
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$matchedFilters[$row->af_id] = $this->checkFilter( $row );
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}
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if ( $wgAbuseFilterCentralDB && !$wgAbuseFilterIsCentral ) {
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// Global filters
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$globalRulesKey = AbuseFilter::getGlobalRulesKey( $this->group );
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$fname = __METHOD__;
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$res = MediaWikiServices::getInstance()->getMainWANObjectCache()->getWithSetCallback(
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$globalRulesKey,
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WANObjectCache::TTL_WEEK,
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function () use ( $fname ) {
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$fdb = AbuseFilter::getCentralDB( DB_REPLICA );
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return iterator_to_array( $fdb->select(
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'abuse_filter',
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AbuseFilter::$allAbuseFilterFields,
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[
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'af_enabled' => 1,
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'af_deleted' => 0,
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'af_global' => 1,
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'af_group' => $this->group,
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],
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$fname
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) );
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},
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[
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'checkKeys' => [ $globalRulesKey ],
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'lockTSE' => 300,
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'version' => 1
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]
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);
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foreach ( $res as $row ) {
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$matchedFilters[ AbuseFilter::buildGlobalName( $row->af_id ) ] =
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$this->checkFilter( $row, true );
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}
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}
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if ( $this->parser->getCondCount() > $wgAbuseFilterConditionLimit ) {
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$actionID = $this->getTaggingID();
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AbuseFilter::bufferTagsToSetByAction( [ $actionID => [ 'abusefilter-condition-limit' ] ] );
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}
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return $matchedFilters;
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}
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/**
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* Check the conditions of a single filter, and profile it if $this->executeMode is true
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*
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* @param stdClass $row
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* @param bool $global
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* @return bool
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*/
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protected function checkFilter( $row, $global = false ) {
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$filterName = AbuseFilter::buildGlobalName( $row->af_id, $global );
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$startConds = $this->parser->getCondCount();
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$startTime = microtime( true );
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// Store the row somewhere convenient
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AbuseFilter::cacheFilter( $filterName, $row );
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$pattern = trim( $row->af_pattern );
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$result = AbuseFilter::checkConditions( $pattern, $this->parser, true, $filterName );
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$timeTaken = microtime( true ) - $startTime;
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$condsUsed = $this->parser->getCondCount() - $startConds;
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$this->profilingData[$filterName] = [
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'time' => $timeTaken,
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'conds' => $condsUsed,
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'result' => $result
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];
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return $result;
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}
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/**
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* Record per-filter profiling, for all filters
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*
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* @param array $data Profiling data, as stored in $this->profilingData
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*/
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protected function recordPerFilterProfiling( array $data ) {
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global $wgAbuseFilterSlowFilterRuntimeLimit;
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foreach ( $data as $filterName => $params ) {
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list( $filterID, $global ) = AbuseFilter::splitGlobalName( $filterName );
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if ( !$global ) {
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// @todo Maybe add a parameter to recordProfilingResult to record global filters
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// data separately (in the foreign wiki)
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$this->recordProfilingResult( $filterID, $params['time'], $params['conds'], $params['result'] );
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}
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$runtime = $params['time'] * 1000;
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if ( $runtime > $wgAbuseFilterSlowFilterRuntimeLimit ) {
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$this->recordSlowFilter( $filterName, $runtime, $params['conds'], $params['result'] );
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}
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}
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}
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/**
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* Record per-filter profiling data
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*
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* @param int $filter
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* @param float $time
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* @param int $conds
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* @param bool $matched
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*/
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protected function recordProfilingResult( $filter, $time, $conds, $matched ) {
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// Defer updates to avoid massive (~1 second) edit time increases
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DeferredUpdates::addCallableUpdate( function () use ( $filter, $time, $conds, $matched ) {
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$stash = MediaWikiServices::getInstance()->getMainObjectStash();
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$profileKey = AbuseFilter::filterProfileKey( $filter );
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$profile = $stash->get( $profileKey );
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if ( $profile !== false ) {
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// Number of observed executions of this filter
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$profile['count']++;
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if ( $matched ) {
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// Number of observed matches of this filter
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$profile['matches']++;
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}
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// Total time spent on this filter from all observed executions
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$profile['total-time'] += $time;
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// Total number of conditions for this filter from all executions
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$profile['total-cond'] += $conds;
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} else {
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$profile = [
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'count' => 1,
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'matches' => (int)$matched,
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'total-time' => $time,
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'total-cond' => $conds
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];
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}
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// Note: It is important that all key information be stored together in a single
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// memcache entry to avoid race conditions where competing Apache instances
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// partially overwrite the stats.
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$stash->set( $profileKey, $profile, 3600 );
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} );
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}
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/**
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* Logs slow filter's runtime data for later analysis
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*
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* @param string $filterId
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* @param float $runtime
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* @param int $totalConditions
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* @param bool $matched
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*/
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protected function recordSlowFilter( $filterId, $runtime, $totalConditions, $matched ) {
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$logger = LoggerFactory::getInstance( 'AbuseFilter' );
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$logger->info(
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'Edit filter {filter_id} on {wiki} is taking longer than expected',
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[
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'wiki' => wfWikiID(),
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'filter_id' => $filterId,
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'title' => $this->title->getPrefixedText(),
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'runtime' => $runtime,
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'matched' => $matched,
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'total_conditions' => $totalConditions
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]
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);
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}
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/**
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* Update global statistics
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*
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* @param int $condsUsed The amount of used conditions
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*/
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protected function recordStats( $condsUsed ) {
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global $wgAbuseFilterConditionLimit, $wgAbuseFilterProfileActionsCap;
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$stash = MediaWikiServices::getInstance()->getMainObjectStash();
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$overflowKey = AbuseFilter::filterLimitReachedKey();
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$totalKey = AbuseFilter::filterUsedKey( $this->group );
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$total = $stash->get( $totalKey );
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$storagePeriod = AbuseFilter::$statsStoragePeriod;
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if ( !$total || $total > $wgAbuseFilterProfileActionsCap ) {
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// This is for if the total doesn't exist, or has gone past the limit.
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// Recreate all the keys at the same time, so they expire together.
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$stash->set( $totalKey, 0, $storagePeriod );
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$stash->set( $overflowKey, 0, $storagePeriod );
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$stash->set( AbuseFilter::filterMatchesKey(), 0, $storagePeriod );
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}
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|
|
$stash->incr( $totalKey );
|
|
|
|
// Increment overflow counter, if our condition limit overflowed
|
|
if ( $condsUsed > $wgAbuseFilterConditionLimit ) {
|
|
$stash->incr( $overflowKey );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Record runtime profiling data for all filters together
|
|
*
|
|
* @param int $totalFilters
|
|
* @param int $totalConditions
|
|
* @param float $runtime
|
|
*/
|
|
protected function recordRuntimeProfilingResult( $totalFilters, $totalConditions, $runtime ) {
|
|
$keyPrefix = 'abusefilter.runtime-profile.' . wfWikiID() . '.';
|
|
|
|
$statsd = MediaWikiServices::getInstance()->getStatsdDataFactory();
|
|
$statsd->timing( $keyPrefix . 'runtime', $runtime );
|
|
$statsd->timing( $keyPrefix . 'total_filters', $totalFilters );
|
|
$statsd->timing( $keyPrefix . 'total_conditions', $totalConditions );
|
|
}
|
|
|
|
/**
|
|
* Executes a set of actions.
|
|
*
|
|
* @param string[] $filters
|
|
* @return Status returns the operation's status. $status->isOK() will return true if
|
|
* there were no actions taken, false otherwise. $status->getValue() will return
|
|
* an array listing the actions taken. $status->getErrors() etc. will provide
|
|
* the errors and warnings to be shown to the user to explain the actions.
|
|
*/
|
|
protected function executeFilterActions( array $filters ) : Status {
|
|
global $wgMainCacheType, $wgAbuseFilterDisallowGlobalLocalBlocks, $wgAbuseFilterRestrictions,
|
|
$wgAbuseFilterBlockDuration, $wgAbuseFilterAnonBlockDuration;
|
|
|
|
$actionsByFilter = AbuseFilter::getConsequencesForFilters( $filters );
|
|
$actionsTaken = array_fill_keys( $filters, [] );
|
|
|
|
$messages = [];
|
|
// Accumulator to track max block to issue
|
|
$maxExpiry = -1;
|
|
|
|
foreach ( $actionsByFilter as $filter => $actions ) {
|
|
// Special-case handling for warnings.
|
|
$filterPublicComments = AbuseFilter::getFilter( $filter )->af_public_comments;
|
|
|
|
$isGlobalFilter = AbuseFilter::splitGlobalName( $filter )[1];
|
|
|
|
// If the filter has "throttle" enabled and throttling is available via object
|
|
// caching, check to see if the user has hit the throttle.
|
|
if ( !empty( $actions['throttle'] ) && $wgMainCacheType !== CACHE_NONE ) {
|
|
$parameters = $actions['throttle']['parameters'];
|
|
$throttleId = array_shift( $parameters );
|
|
list( $rateCount, $ratePeriod ) = explode( ',', array_shift( $parameters ) );
|
|
|
|
$hitThrottle = false;
|
|
|
|
// The rest are throttle-types.
|
|
foreach ( $parameters as $throttleType ) {
|
|
$hitThrottle = $hitThrottle || $this->isThrottled(
|
|
$throttleId, $throttleType, $rateCount, $ratePeriod, $isGlobalFilter );
|
|
}
|
|
|
|
unset( $actions['throttle'] );
|
|
if ( !$hitThrottle ) {
|
|
$actionsTaken[$filter][] = 'throttle';
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if ( $wgAbuseFilterDisallowGlobalLocalBlocks && $isGlobalFilter ) {
|
|
$actions = array_diff_key( $actions, array_filter( $wgAbuseFilterRestrictions ) );
|
|
}
|
|
|
|
if ( !empty( $actions['warn'] ) ) {
|
|
$parameters = $actions['warn']['parameters'];
|
|
$action = $this->vars->getVar( 'action' )->toString();
|
|
// Generate a unique key to determine whether the user has already been warned.
|
|
// We'll warn again if one of these changes: session, page, triggered filter or action
|
|
$warnKey = 'abusefilter-warned-' . md5( $this->title->getPrefixedText() ) .
|
|
'-' . $filter . '-' . $action;
|
|
|
|
// Make sure the session is started prior to using it
|
|
$session = SessionManager::getGlobalSession();
|
|
$session->persist();
|
|
|
|
if ( !isset( $session[$warnKey] ) || !$session[$warnKey] ) {
|
|
$session[$warnKey] = true;
|
|
|
|
$msg = $parameters[0] ?? 'abusefilter-warning';
|
|
$messages[] = [ $msg, $filterPublicComments, $filter ];
|
|
|
|
$actionsTaken[$filter][] = 'warn';
|
|
|
|
// Don't do anything else.
|
|
continue;
|
|
} else {
|
|
// We already warned them
|
|
$session[$warnKey] = false;
|
|
}
|
|
|
|
unset( $actions['warn'] );
|
|
}
|
|
|
|
// Prevent double warnings
|
|
if ( count( array_intersect_key( $actions, array_filter( $wgAbuseFilterRestrictions ) ) ) > 0 &&
|
|
!empty( $actions['disallow'] )
|
|
) {
|
|
unset( $actions['disallow'] );
|
|
}
|
|
|
|
// Find out the max expiry to issue the longest triggered block.
|
|
// Need to check here since methods like user->getBlock() aren't available
|
|
if ( !empty( $actions['block'] ) ) {
|
|
$parameters = $actions['block']['parameters'];
|
|
|
|
if ( count( $parameters ) === 3 ) {
|
|
// New type of filters with custom block
|
|
if ( $this->user->isAnon() ) {
|
|
$expiry = $parameters[1];
|
|
} else {
|
|
$expiry = $parameters[2];
|
|
}
|
|
} else {
|
|
// Old type with fixed expiry
|
|
if ( $this->user->isAnon() && $wgAbuseFilterAnonBlockDuration !== null ) {
|
|
// The user isn't logged in and the anon block duration
|
|
// doesn't default to $wgAbuseFilterBlockDuration.
|
|
$expiry = $wgAbuseFilterAnonBlockDuration;
|
|
} else {
|
|
$expiry = $wgAbuseFilterBlockDuration;
|
|
}
|
|
}
|
|
|
|
$currentExpiry = SpecialBlock::parseExpiryInput( $expiry );
|
|
if ( $currentExpiry > SpecialBlock::parseExpiryInput( $maxExpiry ) ) {
|
|
// Save the parameters to issue the block with
|
|
$maxExpiry = $expiry;
|
|
$blockValues = [
|
|
AbuseFilter::getFilter( $filter )->af_public_comments,
|
|
$filter,
|
|
is_array( $parameters ) && in_array( 'blocktalk', $parameters )
|
|
];
|
|
}
|
|
unset( $actions['block'] );
|
|
}
|
|
|
|
// Do the rest of the actions
|
|
foreach ( $actions as $action => $info ) {
|
|
$newMsg = $this->takeConsequenceAction(
|
|
$action,
|
|
$info['parameters'],
|
|
AbuseFilter::getFilter( $filter )->af_public_comments,
|
|
$filter
|
|
);
|
|
|
|
if ( $newMsg !== null ) {
|
|
$messages[] = $newMsg;
|
|
}
|
|
$actionsTaken[$filter][] = $action;
|
|
}
|
|
}
|
|
|
|
// Since every filter has been analysed, we now know what the
|
|
// longest block duration is, so we can issue the block if
|
|
// maxExpiry has been changed.
|
|
if ( $maxExpiry !== -1 ) {
|
|
$this->doAbuseFilterBlock(
|
|
[
|
|
'desc' => $blockValues[0],
|
|
'number' => $blockValues[1]
|
|
],
|
|
$this->user->getName(),
|
|
$maxExpiry,
|
|
true,
|
|
$blockValues[2]
|
|
);
|
|
$message = [
|
|
'abusefilter-blocked-display',
|
|
$blockValues[0],
|
|
$blockValues[1]
|
|
];
|
|
// Manually add the message. If we're here, there is one.
|
|
$messages[] = $message;
|
|
$actionsTaken[$blockValues[1]][] = 'block';
|
|
}
|
|
|
|
return $this->buildStatus( $actionsTaken, $messages );
|
|
}
|
|
|
|
/**
|
|
* @param string $throttleId
|
|
* @param string $types
|
|
* @param string $rateCount
|
|
* @param string $ratePeriod
|
|
* @param bool $global
|
|
* @return bool
|
|
*/
|
|
protected function isThrottled( $throttleId, $types, $rateCount, $ratePeriod, $global = false ) {
|
|
$stash = MediaWikiServices::getInstance()->getMainObjectStash();
|
|
$key = $this->throttleKey( $throttleId, $types, $global );
|
|
$count = intval( $stash->get( $key ) );
|
|
|
|
$logger = LoggerFactory::getInstance( 'AbuseFilter' );
|
|
$logger->debug( "Got value $count for throttle key $key" );
|
|
|
|
if ( $count > 0 ) {
|
|
$stash->incr( $key );
|
|
$count++;
|
|
$logger->debug( "Incremented throttle key $key" );
|
|
} else {
|
|
$logger->debug( "Added throttle key $key with value 1" );
|
|
$stash->add( $key, 1, $ratePeriod );
|
|
$count = 1;
|
|
}
|
|
|
|
if ( $count > $rateCount ) {
|
|
$logger->debug( "Throttle $key hit value $count -- maximum is $rateCount." );
|
|
|
|
// THROTTLED
|
|
return true;
|
|
}
|
|
|
|
$logger->debug( "Throttle $key not hit!" );
|
|
|
|
// NOT THROTTLED
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param string $throttleId
|
|
* @param string $type
|
|
* @param bool $global
|
|
* @return string
|
|
*/
|
|
protected function throttleKey( $throttleId, $type, $global = false ) {
|
|
global $wgAbuseFilterIsCentral, $wgAbuseFilterCentralDB;
|
|
|
|
$types = explode( ',', $type );
|
|
|
|
$identifiers = [];
|
|
|
|
foreach ( $types as $subtype ) {
|
|
$identifiers[] = $this->throttleIdentifier( $subtype );
|
|
}
|
|
|
|
$identifier = sha1( implode( ':', $identifiers ) );
|
|
|
|
$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
|
|
if ( $global && !$wgAbuseFilterIsCentral ) {
|
|
return $cache->makeGlobalKey(
|
|
'abusefilter', 'throttle', $wgAbuseFilterCentralDB, $throttleId, $type, $identifier
|
|
);
|
|
}
|
|
|
|
return $cache->makeKey( 'abusefilter', 'throttle', $throttleId, $type, $identifier );
|
|
}
|
|
|
|
/**
|
|
* @param string $type
|
|
* @return int|string
|
|
*/
|
|
protected function throttleIdentifier( $type ) {
|
|
$request = RequestContext::getMain()->getRequest();
|
|
|
|
switch ( $type ) {
|
|
case 'ip':
|
|
$identifier = $request->getIP();
|
|
break;
|
|
case 'user':
|
|
$identifier = $this->user->getId();
|
|
break;
|
|
case 'range':
|
|
$identifier = substr( IP::toHex( $request->getIP() ), 0, 4 );
|
|
break;
|
|
case 'creationdate':
|
|
$reg = $this->user->getRegistration();
|
|
$identifier = $reg - ( $reg % 86400 );
|
|
break;
|
|
case 'editcount':
|
|
// Hack for detecting different single-purpose accounts.
|
|
$identifier = $this->user->getEditCount();
|
|
break;
|
|
case 'site':
|
|
$identifier = 1;
|
|
break;
|
|
case 'page':
|
|
$identifier = $this->title->getPrefixedText();
|
|
break;
|
|
default:
|
|
// Should never happen
|
|
// @codeCoverageIgnoreStart
|
|
$identifier = 0;
|
|
// @codeCoverageIgnoreEnd
|
|
}
|
|
|
|
return $identifier;
|
|
}
|
|
|
|
/**
|
|
* @param string $action
|
|
* @param array $parameters
|
|
* @param string $ruleDescription
|
|
* @param int|string $ruleNumber
|
|
*
|
|
* @return array|null a message describing the action that was taken,
|
|
* or null if no action was taken. The message is given as an array
|
|
* containing the message key followed by any message parameters.
|
|
*/
|
|
protected function takeConsequenceAction( $action, $parameters, $ruleDescription, $ruleNumber ) {
|
|
global $wgAbuseFilterCustomActionsHandlers;
|
|
|
|
$message = null;
|
|
|
|
switch ( $action ) {
|
|
case 'disallow':
|
|
$msg = $parameters[0] ?? 'abusefilter-disallowed';
|
|
$message = [ $msg, $ruleDescription, $ruleNumber ];
|
|
break;
|
|
case 'rangeblock':
|
|
global $wgAbuseFilterRangeBlockSize, $wgBlockCIDRLimit;
|
|
|
|
$ip = RequestContext::getMain()->getRequest()->getIP();
|
|
$type = IP::isIPv6( $ip ) ? 'IPv6' : 'IPv4';
|
|
$CIDRsize = max( $wgAbuseFilterRangeBlockSize[$type], $wgBlockCIDRLimit[$type] );
|
|
$blockCIDR = $ip . '/' . $CIDRsize;
|
|
|
|
$this->doAbuseFilterBlock(
|
|
[
|
|
'desc' => $ruleDescription,
|
|
'number' => $ruleNumber
|
|
],
|
|
IP::sanitizeRange( $blockCIDR ),
|
|
'1 week',
|
|
false
|
|
);
|
|
|
|
$message = [
|
|
'abusefilter-blocked-display',
|
|
$ruleDescription,
|
|
$ruleNumber
|
|
];
|
|
break;
|
|
case 'degroup':
|
|
if ( !$this->user->isAnon() ) {
|
|
// Pull the groups from the VariableHolder, so that they will always be computed.
|
|
// This allow us to pull the groups from the VariableHolder to undo the degroup
|
|
// via Special:AbuseFilter/revert.
|
|
$groups = $this->vars->getVar( 'user_groups' );
|
|
if ( $groups->type !== AFPData::DARRAY ) {
|
|
// Somehow, the variable wasn't set
|
|
$groups = $this->user->getEffectiveGroups();
|
|
$this->vars->setVar( 'user_groups', $groups );
|
|
} else {
|
|
$groups = $groups->toNative();
|
|
}
|
|
$this->vars->setVar( 'user_groups', $groups );
|
|
|
|
foreach ( $groups as $group ) {
|
|
$this->user->removeGroup( $group );
|
|
}
|
|
|
|
$message = [
|
|
'abusefilter-degrouped',
|
|
$ruleDescription,
|
|
$ruleNumber
|
|
];
|
|
|
|
// Don't log it if there aren't any groups being removed!
|
|
if ( !count( $groups ) ) {
|
|
break;
|
|
}
|
|
|
|
$logEntry = new ManualLogEntry( 'rights', 'rights' );
|
|
$logEntry->setPerformer( AbuseFilter::getFilterUser() );
|
|
$logEntry->setTarget( $this->user->getUserPage() );
|
|
$logEntry->setComment(
|
|
wfMessage(
|
|
'abusefilter-degroupreason',
|
|
$ruleDescription,
|
|
$ruleNumber
|
|
)->inContentLanguage()->text()
|
|
);
|
|
$logEntry->setParameters( [
|
|
'4::oldgroups' => $groups,
|
|
'5::newgroups' => []
|
|
] );
|
|
$logEntry->publish( $logEntry->insert() );
|
|
}
|
|
|
|
break;
|
|
case 'blockautopromote':
|
|
if ( !$this->user->isAnon() ) {
|
|
// Block for 3-7 days.
|
|
$blockPeriod = (int)mt_rand( 3 * 86400, 7 * 86400 );
|
|
MediaWikiServices::getInstance()->getMainObjectStash()->set(
|
|
AbuseFilter::autoPromoteBlockKey( $this->user ), true, $blockPeriod
|
|
);
|
|
|
|
$message = [
|
|
'abusefilter-autopromote-blocked',
|
|
$ruleDescription,
|
|
$ruleNumber
|
|
];
|
|
}
|
|
break;
|
|
|
|
case 'block':
|
|
// Do nothing, handled at the end of executeFilterActions. Here for completeness.
|
|
break;
|
|
|
|
case 'tag':
|
|
// Mark with a tag on recentchanges.
|
|
$actionID = $this->getTaggingID();
|
|
AbuseFilter::bufferTagsToSetByAction( [ $actionID => $parameters ] );
|
|
break;
|
|
default:
|
|
if ( isset( $wgAbuseFilterCustomActionsHandlers[$action] ) ) {
|
|
$customFunction = $wgAbuseFilterCustomActionsHandlers[$action];
|
|
if ( is_callable( $customFunction ) ) {
|
|
$msg = call_user_func(
|
|
$customFunction,
|
|
$action,
|
|
$parameters,
|
|
$this->title,
|
|
$this->vars,
|
|
$ruleDescription,
|
|
$ruleNumber
|
|
);
|
|
}
|
|
if ( isset( $msg ) ) {
|
|
$message = [ $msg ];
|
|
}
|
|
} else {
|
|
$logger = LoggerFactory::getInstance( 'AbuseFilter' );
|
|
$logger->warning( "Unrecognised action $action" );
|
|
}
|
|
}
|
|
|
|
return $message;
|
|
}
|
|
|
|
/**
|
|
* Perform a block by the AbuseFilter system user
|
|
* @param array $rule should have 'desc' and 'number'
|
|
* @param string $target
|
|
* @param string $expiry
|
|
* @param bool $isAutoBlock
|
|
* @param bool $preventEditOwnUserTalk
|
|
*/
|
|
private function doAbuseFilterBlock(
|
|
array $rule,
|
|
$target,
|
|
$expiry,
|
|
$isAutoBlock,
|
|
$preventEditOwnUserTalk = false
|
|
) {
|
|
$filterUser = AbuseFilter::getFilterUser();
|
|
$reason = wfMessage(
|
|
'abusefilter-blockreason',
|
|
$rule['desc'], $rule['number']
|
|
)->inContentLanguage()->text();
|
|
|
|
$block = new DatabaseBlock();
|
|
$block->setTarget( $target );
|
|
$block->setBlocker( $filterUser );
|
|
$block->mReason = $reason;
|
|
$block->isHardblock( false );
|
|
$block->isAutoblocking( $isAutoBlock );
|
|
$block->isCreateAccountBlocked( true );
|
|
$block->isUsertalkEditAllowed( !$preventEditOwnUserTalk );
|
|
$block->mExpiry = SpecialBlock::parseExpiryInput( $expiry );
|
|
|
|
$success = $block->insert();
|
|
|
|
if ( $success ) {
|
|
// Log it only if the block was successful
|
|
$logParams = [];
|
|
$logParams['5::duration'] = ( $block->mExpiry === 'infinity' )
|
|
? 'indefinite'
|
|
: $expiry;
|
|
$flags = [ 'nocreate' ];
|
|
if ( !$block->isAutoblocking() && !IP::isIPAddress( $target ) ) {
|
|
// Conditionally added same as SpecialBlock
|
|
$flags[] = 'noautoblock';
|
|
}
|
|
if ( $preventEditOwnUserTalk === true ) {
|
|
$flags[] = 'nousertalk';
|
|
}
|
|
$logParams['6::flags'] = implode( ',', $flags );
|
|
|
|
$logEntry = new ManualLogEntry( 'block', 'block' );
|
|
$logEntry->setTarget( Title::makeTitle( NS_USER, $target ) );
|
|
$logEntry->setComment( $reason );
|
|
$logEntry->setPerformer( $filterUser );
|
|
$logEntry->setParameters( $logParams );
|
|
$blockIds = array_merge( [ $success['id'] ], $success['autoIds'] );
|
|
$logEntry->setRelations( [ 'ipb_id' => $blockIds ] );
|
|
$logEntry->publish( $logEntry->insert() );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Constructs a Status object as returned by executeFilterActions() from the list of
|
|
* actions taken and the corresponding list of messages.
|
|
*
|
|
* @param array[] $actionsTaken associative array mapping each filter to the list if
|
|
* actions taken because of that filter.
|
|
* @param array[] $messages a list of arrays, where each array contains a message key
|
|
* followed by any message parameters.
|
|
*
|
|
* @return Status
|
|
*/
|
|
protected function buildStatus( array $actionsTaken, array $messages ) : Status {
|
|
$status = Status::newGood( $actionsTaken );
|
|
|
|
foreach ( $messages as $msg ) {
|
|
$status->fatal( ...$msg );
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
/**
|
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* Creates a template to use for logging taken actions
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*
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* @return array
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*/
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protected function buildLogTemplate() : array {
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global $wgAbuseFilterLogIP;
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$request = RequestContext::getMain()->getRequest();
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$action = $this->vars->getVar( 'action' )->toString();
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// If $this->user isn't safe to load (e.g. a failure during
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// AbortAutoAccount), create a dummy anonymous user instead.
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$user = $this->user->isSafeToLoad() ? $this->user : new User;
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// Create a template
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$logTemplate = [
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'afl_user' => $user->getId(),
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'afl_user_text' => $user->getName(),
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'afl_timestamp' => wfGetDB( DB_REPLICA )->timestamp(),
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'afl_namespace' => $this->title->getNamespace(),
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'afl_title' => $this->title->getDBkey(),
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'afl_action' => $action,
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'afl_ip' => $wgAbuseFilterLogIP ? $request->getIP() : ''
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];
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// Hack to avoid revealing IPs of people creating accounts
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if ( !$user->getId() && ( $action === 'createaccount' || $action === 'autocreateaccount' ) ) {
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$logTemplate['afl_user_text'] = $this->vars->getVar( 'accountname' )->toString();
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}
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return $logTemplate;
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}
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/**
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* Create and publish log entries for taken actions
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*
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* @param array[] $actionsTaken
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* @todo Split this method
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*/
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protected function addLogEntries( array $actionsTaken ) {
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$dbw = wfGetDB( DB_MASTER );
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$logTemplate = $this->buildLogTemplate();
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$centralLogTemplate = [
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'afl_wiki' => wfWikiID(),
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];
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$logRows = [];
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$centralLogRows = [];
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$loggedLocalFilters = [];
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$loggedGlobalFilters = [];
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foreach ( $actionsTaken as $filter => $actions ) {
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list( $filterID, $global ) = AbuseFilter::splitGlobalName( $filter );
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$thisLog = $logTemplate;
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$thisLog['afl_filter'] = $filter;
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$thisLog['afl_actions'] = implode( ',', $actions );
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// Don't log if we were only throttling.
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if ( $thisLog['afl_actions'] !== 'throttle' ) {
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$logRows[] = $thisLog;
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// Global logging
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if ( $global ) {
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$centralLog = $thisLog + $centralLogTemplate;
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$centralLog['afl_filter'] = $filterID;
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$centralLog['afl_title'] = $this->title->getPrefixedText();
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$centralLog['afl_namespace'] = 0;
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$centralLogRows[] = $centralLog;
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$loggedGlobalFilters[] = $filterID;
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} else {
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$loggedLocalFilters[] = $filter;
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}
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}
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}
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if ( !count( $logRows ) ) {
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return;
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}
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// Only store the var dump if we're actually going to add log rows.
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$varDump = AbuseFilter::storeVarDump( $this->vars );
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// To distinguish from stuff stored directly
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$varDump = "stored-text:$varDump";
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$stash = MediaWikiServices::getInstance()->getMainObjectStash();
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// Increment trigger counter
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$stash->incr( AbuseFilter::filterMatchesKey() );
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$localLogIDs = [];
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global $wgAbuseFilterNotifications, $wgAbuseFilterNotificationsPrivate;
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foreach ( $logRows as $data ) {
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$data['afl_var_dump'] = $varDump;
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$dbw->insert( 'abuse_filter_log', $data, __METHOD__ );
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$localLogIDs[] = $data['afl_id'] = $dbw->insertId();
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// Give grep a chance to find the usages:
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// logentry-abusefilter-hit
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$entry = new ManualLogEntry( 'abusefilter', 'hit' );
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// Construct a user object
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$user = User::newFromId( $data['afl_user'] );
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$user->setName( $data['afl_user_text'] );
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$entry->setPerformer( $user );
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$entry->setTarget( $this->title );
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// Additional info
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$entry->setParameters( [
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'action' => $data['afl_action'],
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'filter' => $data['afl_filter'],
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'actions' => $data['afl_actions'],
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'log' => $data['afl_id'],
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] );
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// Send data to CheckUser if installed and we
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// aren't already sending a notification to recentchanges
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if ( ExtensionRegistry::getInstance()->isLoaded( 'CheckUser' )
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&& strpos( $wgAbuseFilterNotifications, 'rc' ) === false
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) {
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$rc = $entry->getRecentChange();
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CheckUserHooks::updateCheckUserData( $rc );
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}
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if ( $wgAbuseFilterNotifications !== false ) {
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list( $filterID, $global ) = AbuseFilter::splitGlobalName( $data['afl_filter'] );
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if ( AbuseFilter::filterHidden( $filterID, $global ) && !$wgAbuseFilterNotificationsPrivate ) {
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continue;
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}
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$this->publishEntry( $dbw, $entry, $wgAbuseFilterNotifications );
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}
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}
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$method = __METHOD__;
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if ( count( $loggedLocalFilters ) ) {
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// Update hit-counter.
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$dbw->onTransactionPreCommitOrIdle(
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function () use ( $dbw, $loggedLocalFilters, $method ) {
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$dbw->update( 'abuse_filter',
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[ 'af_hit_count=af_hit_count+1' ],
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[ 'af_id' => $loggedLocalFilters ],
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$method
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);
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}
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);
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}
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$globalLogIDs = [];
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// Global stuff
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if ( count( $loggedGlobalFilters ) ) {
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$this->vars->computeDBVars();
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$globalVarDump = AbuseFilter::storeVarDump( $this->vars, true );
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$globalVarDump = "stored-text:$globalVarDump";
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foreach ( $centralLogRows as $index => $data ) {
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$centralLogRows[$index]['afl_var_dump'] = $globalVarDump;
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}
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$fdb = AbuseFilter::getCentralDB( DB_MASTER );
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foreach ( $centralLogRows as $row ) {
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$fdb->insert( 'abuse_filter_log', $row, __METHOD__ );
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$globalLogIDs[] = $fdb->insertId();
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}
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$fdb->onTransactionPreCommitOrIdle(
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function () use ( $fdb, $loggedGlobalFilters, $method ) {
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$fdb->update( 'abuse_filter',
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[ 'af_hit_count=af_hit_count+1' ],
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[ 'af_id' => $loggedGlobalFilters ],
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$method
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);
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}
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);
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}
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AbuseFilter::$logIds[ $this->title->getPrefixedText() ] = [
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'local' => $localLogIDs,
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'global' => $globalLogIDs
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];
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$this->checkEmergencyDisable( $loggedLocalFilters );
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}
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/**
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* Like LogEntry::publish, but doesn't require an ID (which we don't have) and skips the
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* tagging part
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*
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* @param IDatabase $dbw To cancel the callback if the log insertion fails
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* @param ManualLogEntry $entry
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* @param string $to One of 'udp', 'rc' and 'rcandudp'
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*/
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private function publishEntry( IDatabase $dbw, ManualLogEntry $entry, $to ) {
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DeferredUpdates::addCallableUpdate(
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function () use ( $entry, $to ) {
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$rc = $entry->getRecentChange();
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if ( $to === 'rc' || $to === 'rcandudp' ) {
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$rc->save( $rc::SEND_NONE );
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}
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if ( $to === 'udp' || $to === 'rcandudp' ) {
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$rc->notifyRCFeeds();
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}
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},
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DeferredUpdates::POSTSEND,
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$dbw
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);
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}
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/**
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* Determine whether a filter must be throttled, i.e. its potentially dangerous
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* actions must be disabled.
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*
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* @param string[] $filters The filters to check
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*/
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protected function checkEmergencyDisable( array $filters ) {
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$stash = MediaWikiServices::getInstance()->getMainObjectStash();
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// @ToDo this is an amount between 1 and AbuseFilterProfileActionsCap, which means that the
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// reliability of this number may strongly vary. We should instead use a fixed one.
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$totalActions = $stash->get( AbuseFilter::filterUsedKey( $this->group ) );
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foreach ( $filters as $filter ) {
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$threshold = AbuseFilter::getEmergencyValue( 'threshold', $this->group );
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$hitCountLimit = AbuseFilter::getEmergencyValue( 'count', $this->group );
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$maxAge = AbuseFilter::getEmergencyValue( 'age', $this->group );
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$filterProfile = $stash->get( AbuseFilter::filterProfileKey( $filter ) );
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$matchCount = $filterProfile['matches'] ?? 1;
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// Figure out if the filter is subject to being throttled.
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$filterAge = wfTimestamp( TS_UNIX, AbuseFilter::getFilter( $filter )->af_timestamp );
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$exemptTime = $filterAge + $maxAge;
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if ( $totalActions && $exemptTime > time() && $matchCount > $hitCountLimit &&
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( $matchCount / $totalActions ) > $threshold
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) {
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// More than $wgAbuseFilterEmergencyDisableCount matches, constituting more than
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// $threshold (a fraction) of last few edits. Disable it.
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DeferredUpdates::addUpdate(
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new AutoCommitUpdate(
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wfGetDB( DB_MASTER ),
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__METHOD__,
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function ( IDatabase $dbw, $fname ) use ( $filter ) {
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$dbw->update(
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'abuse_filter',
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[ 'af_throttled' => 1 ],
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[ 'af_id' => $filter ],
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$fname
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);
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}
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)
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);
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}
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}
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}
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/**
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* Helper function to get the ID used to identify an action for later tagging it.
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* @return string
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*/
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protected function getTaggingID() {
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$action = $this->vars->getVar( 'action' )->toString();
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if ( strpos( $action, 'createaccount' ) === false ) {
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$username = $this->user->getName();
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$actionTitle = $this->title;
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} else {
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$username = $this->vars->getVar( 'accountname' )->toString();
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$actionTitle = Title::makeTitleSafe( NS_USER, $username );
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}
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return AbuseFilter::getTaggingActionId( $action, $actionTitle, $username );
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}
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}
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