mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/LoginNotify
synced 2024-11-13 17:53:12 +00:00
641 lines
18 KiB
PHP
641 lines
18 KiB
PHP
<?php
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/**
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* Body of LoginNotify extension
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*
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* @file
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* @ingroup Extensions
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*/
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use MediaWiki\Logger\LoggerFactory;
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use Psr\Log\LoggerInterface;
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/**
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* Handle sending notifications on login from unknown source.
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*
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* @author Brian Wolff
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*/
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class LoginNotify {
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const COOKIE_NAME = 'mw_prevLogin';
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const NO_INFO_AVAILABLE = 2;
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/** @var BagOStuff */
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private $cache;
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/** @var Config */
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private $config;
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/** @var LoggerInterface Usually instance of LoginNotify log */
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private $log;
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/**
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* Constructor
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*
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* @param $cfg Config Optional. Set if you have handy.
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* @param $cache BagOStuff Optional. Most callers should not set this
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* @param $log LoggerInterface Optional. Most callers should not set this.
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*/
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function __construct( Config $cfg = null, BagOStuff $cache = null, LoggerInterface $log = null ) {
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if ( !$cache ) {
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$cache = ObjectCache::getLocalClusterInstance();
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}
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if ( !$cfg ) {
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$cfg = RequestContext::getMain()->getConfig();
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}
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$this->cache = $cache;
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$this->config = $cfg;
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if ( $this->config->get( 'LoginNotifySecretKey' ) !== null ) {
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$this->secret = $this->config->get( 'LoginNotifySecretKey' );
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} else {
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$globalSecret = $this->config->get( 'SecretKey' );
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$this->secret = hash( 'sha256', $globalSecret + 'LoginNotify' );
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}
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if ( !$log ) {
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$log = LoggerFactory::getInstance( 'LoginNotify' );
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}
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$this->log = $log;
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}
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/**
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* Get just network part of an IP (assuming /24 or /64)
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*
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* @param String $ip Either IPv4 or IPv6 address
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* @return string Just the network part (e.g. 127.0.0.)
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*/
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private function getIPNetwork( $ip ) {
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$ip = IP::sanitizeIP( $ip );
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if ( IP::isIPv6( $ip ) ) {
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// Match against the /64
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$subnetRegex = '/[0-9A-F]+:[0-9A-F]+:[0-9A-F]+:[0-9A-F]+$/i';
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} elseif ( IP::isIPv4( $ip ) ) {
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// match against the /24
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$subnetRegex = '/\d+$/';
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} else {
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throw new UnexpectedValueException( "Unrecognized IP address: $ip" );
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}
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$prefix = preg_replace( $subnetRegex, '', $ip );
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if ( !is_string( $prefix ) ) {
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throw new Exception( __METHOD__ . " Regex failed!?" );
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}
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return $prefix;
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}
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/**
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* Is the current computer known to be used by the given user
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*
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* @param $user User User in question
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* @return boolean true if the user has used this computer before
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*/
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private function isFromKnownIP( User $user ) {
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$cookieResult = $this->checkUserInCookie( $user );
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if ( $cookieResult === true ) {
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// User has cookie
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return true;
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}
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$cacheResult = $this->checkUserInCache( $user );
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if ( $cacheResult === true ) {
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return true;
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}
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$cuResult = $this->checkUserInCheckUser( $user );
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if ( $cuResult === true ) {
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return true;
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}
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// If we have no check user data for the user, and there was
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// no cookie supplied, just pass the user in, since we don't have
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// enough info to determine if from known ip.
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// FIXME: Does this make sense
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if (
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$cuResult === self::NO_INFO_AVAILABLE &&
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$cookieResult === self::NO_INFO_AVAILABLE &&
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$cacheResult === self::NO_INFO_AVAILABLE
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) {
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// We have to be careful here. Whether $cookieResult is
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// self::NO_INFO_AVAILABLE, is under control of the attacker.
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// If checking CheckUser is disabled, then we should not
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// hit this branch.
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$this->log->info( "Assuming {user} is from known IP since no info available", [
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'method' => __METHOD__,
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'user' => $user->getName()
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] );
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return true;
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}
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return false;
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}
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/**
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* Check if we cached this user's ip address from last login.
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*
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* @param $user User User in question.
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* @return Mixed true, false or self::NO_INFO_AVAILABLE.
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*/
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private function checkUserInCache( User $user ) {
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$ipPrefix = $this->getIPNetwork( $user->getRequest()->getIP() );
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$key = $this->getKey( $user, 'prevSubnet' );
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$res = $this->cache->get( $key );
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if ( $res !== false ) {
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return $res === $ipPrefix;
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}
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return self::NO_INFO_AVAILABLE;
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}
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/**
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* Is the subnet of the current IP in the check user data for the user.
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*
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* If CentralAuth is installed, this will check not only the current wiki,
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* but also the ten wikis where user has most edits on.
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*
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* @param $user User User in question.
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* @return Mixed true, false or self::NO_INFO_AVAILABLE.
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*/
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private function checkUserInCheckUser( User $user ) {
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if ( !$this->config->get( 'LoginNotifyCheckKnownIPs' )
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|| !class_exists( 'CheckUser' )
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) {
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// Check user checks disabled.
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// Note: Its important this be false and not self::NO_INFO_AVAILABLE.
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return false;
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}
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$haveAnyInfo = false;
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$prefix = $this->getIPNetwork( $user->getRequest()->getIP() );
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$dbr = wfGetDB( DB_SLAVE );
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$localResult = $this->checkUserInCheckUserQuery( $user->getId(), $prefix, $dbr );
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if ( $localResult ) {
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return true;
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}
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if ( !$haveAnyInfo ) {
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$haveAnyInfo = $this->checkUserInCheckUserAnyInfo( $user->getId(), $dbr );
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}
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// Also check checkuser table on the top ten wikis where this user has
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// edited the most. We only do top ten, to limit the worst-case where the
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// user has accounts on 800 wikis.
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if ( class_exists( 'CentralAuthUser' ) ) {
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$wikisByEditCounts = [];
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$globalUser = CentralAuthUser::getInstance( $user );
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if ( $globalUser->exists() ) {
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// This is expensive. However, On WMF wikis, probably
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// already done as part of password complexity check, and
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// will be cached.
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$info = $globalUser->queryAttached();
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// already checked the local wiki.
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unset( $info[wfWikiId()] );
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usort( $info, function( $a, $b ) {
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// descending order
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return $b['editCount'] - $a['editCount'];
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}
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);
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$count = 0;
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foreach( $info as $wiki => $localInfo ) {
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if ( $count > 10 || $localInfo['editCount'] < 1 ) {
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break;
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}
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$lb = wfGetLB( $wiki );
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$dbrLocal = $lb->getConnection( DB_SLAVE, [], $wiki );
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// FIXME The case where there are no CU entries for
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// this user.
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$res = $this->checkUserInCheckUserQuery(
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$localInfo['id'],
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$prefix,
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$dbrLocal
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);
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$lb->reuseConnection( $dbrLocal );
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if ( $res ) {
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return true;
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}
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if ( !$haveAnyInfo ) {
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$haveAnyInfo = $this->checkUserInCheckUserAnyInfo( $user->getId(), $dbr );
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}
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$count++;
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}
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}
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}
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if ( !$haveAnyInfo ) {
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return self::NO_INFO_AVAILABLE;
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}
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return false;
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}
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/**
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* Actually do the query of the check user table.
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*
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* @note This catches and ignores database errors.
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* @param $userId int User id number (Not neccesarily for the local wiki)
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* @param $ipFragment string Prefix to match against cuc_ip (from $this->getIPNetwork())
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* @param $dbr DatabaseBase A database connection (possibly foreign)
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* @return boolean If $ipFragment is in check user db
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*/
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private function checkUserInCheckUserQuery( $userId, $ipFragment, DatabaseBase $dbr ) {
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// For some unknown reason, the index is on
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// (cuc_user, cuc_ip, cuc_timestamp), instead of
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// cuc_ip_hex which would be ideal.
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// user-agent might also be good to look at,
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// but no index on that.
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try {
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$IPHasBeenUsedBefore = $dbr->selectField(
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'cu_changes',
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'1',
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[
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'cuc_user' => $userId,
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'cuc_ip ' . $dbr->buildLike(
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$ipFragment,
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$dbr->anyString()
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)
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],
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__METHOD__
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);
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} catch ( DBQueryError $e ) {
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// Maybe we're doing a cross-wiki db query
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// on a wiki which doesn't have CU installed?
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$this->log->warning( "LoginNotify: Error getting CU data for user no. {user} on " . $dbr->getWikiID(), [
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'user' => $userId,
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'method' => __METHOD__,
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'exception' => $e,
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'wikiId' => $dbr->getWikiID()
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] );
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return false;
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}
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return $IPHasBeenUsedBefore;
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}
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/**
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* Check if we have any check user info for this user
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*
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* If we have no info for user, we maybe don't treat it as
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* an unknown IP, since user has no known IPs.
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*
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* @todo FIXME Does this behaviour make sense, esp. with cookie check?
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* @param $userId int User id number (possibly on foreign wiki)
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* @param $dbr DatabaseBase DB connection (possibly to foreign wiki)
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*/
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private function checkUserInCheckUserAnyInfo( $userId, DatabaseBase $dbr ) {
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// Verify that we actually have IP info for
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// this user.
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// @todo: Should this instead be if we have a
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// a certain number of checkuser entries for this
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// user. Or maybe it should be if we have at least
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// 2 different IPs for this user. Or something else.
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try {
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$haveIPInfo = $dbr->selectField(
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'cu_changes',
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'1',
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[
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'cuc_user' => $userId
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],
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__METHOD__
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);
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} catch ( DBQueryError $e ) {
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// Maybe we're doing a cross-wiki db query
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// on a wiki which doesn't have CU installed?
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$this->log->warning( "LoginNotify: Error getting CU data for user no. {user} on " . $dbr->getWikiID(), [
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'user' => $userId,
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'method' => __METHOD__,
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'exception' => $e,
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'wikiId' => $dbr->getWikiID()
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] );
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return false;
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}
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return $haveIPInfo;
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}
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/**
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* Give the user a cookie saying that they've previously logged in from this computer.
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*
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* @note If user already has a cookie, this will refresh it.
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* @param $user User User in question who just logged in.
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*/
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private function setLoginCookie( User $user ) {
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$cookie = $this->getPrevLoginCookie( $user->getRequest() );
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list( , $newCookie ) = $this->checkAndGenerateCookie( $user, $cookie );
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$expire = time() + $this->config->get( 'LoginNotifyCookieExpire' );
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$resp = $user->getRequest()->response();
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$resp->setCookie(
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self::COOKIE_NAME,
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$newCookie,
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$expire,
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[
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'domain' => $this->config->get( 'LoginNotifyCookieDomain' ),
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// Allow sharing this cookie between wikis
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'prefix' => ''
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]
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);
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}
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/**
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* Give the user a cookie and cache address in memcache
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*
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* It is expected this be called upon successful log in.
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*
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* @param $user User The user in question.
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*/
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public function setCurrentAddressAsKnown( User $user ) {
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$this->cacheLoginIP( $user );
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$this->setLoginCookie( $user );
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}
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/**
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* Cache the current IP subnet as being known location for user
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*
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* @param $user User
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*/
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private function cacheLoginIP( User $user ) {
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// For simplicity, this only stores the last IP subnet used.
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// Its assumed that most of the time, we'll be able to rely on
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// the cookie or checkuser data.
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$expiry = $this->config->get( 'LoginNotifyCacheLoginIPExpiry' );
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if ( $expiry !== false ) {
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$ipPrefix = $this->getIPNetwork( $user->getRequest()->getIP() );
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$key = $this->getKey( $user, 'prevSubnet' );
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$res = $this->cache->set( $key, $ipPrefix, $expiry );
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}
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}
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/**
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* Check if a certain user is in the cookie.
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*
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* @param $user User User in question
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* @return Mixed true, false or self::NO_INFO_AVAILABLE.
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*/
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private function checkUserInCookie( User $user ) {
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$cookie = $this->getPrevLoginCookie( $user->getRequest() );
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if ( $cookie === '' ) {
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// FIXME, does this really make sense?
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return self::NO_INFO_AVAILABLE;
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}
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list( $userKnown, ) = $this->checkAndGenerateCookie( $user, $cookie );
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return $userKnown;
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}
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/**
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* Get the cookie with previous login names in it
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*
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* @param WebRequest
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* @return String The cookie. Empty string if no cookie.
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*/
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private function getPrevLoginCookie( WebRequest $req ) {
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return $req->getCookie( self::COOKIE_NAME, '', '' );
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}
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/**
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* Check if user is in cookie, and generate a new cookie with user record
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*
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* When generating a new cookie, it will add the current user to the top,
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* remove any previous instances of the current user, and remove older user
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* references, if there is too many records.
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*
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* @param $user User User that person is attempting to log in as
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* @param $cookie String A cookie, which has records separated by '!'
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*/
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private function checkAndGenerateCookie( User $user, $cookie ) {
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$userSeenBefore = false;
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if ( $cookie === '' ) {
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$cookieRecords = [];
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} else {
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$cookieRecords = explode( '.', $cookie );
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}
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$newCookie = $this->generateUserCookieRecord( $user->getName() );
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$maxCookieRecords = $this->config->get( 'LoginNotifyMaxCookieRecords' );
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for( $i = 0; $i < count( $cookieRecords ); $i++ ) {
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if ( !$this->validateCookieRecord( $cookieRecords[$i] ) ) {
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// Skip invalid or old cookie records.
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continue;
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}
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$curUser = $this->checkUserRecordGivenCookie( $user, $cookieRecords[$i] );
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$userSeenBefore = $userSeenBefore || $curUser;
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if ( $i < $maxCookieRecords && !$curUser ) {
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$newCookie .= '.' . $cookieRecords[$i];
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}
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}
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return [ $userSeenBefore, $newCookie ];
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}
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/**
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* See if a specific cookie record is for a specific user.
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*
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* Cookie record format is: Year - 32-bit salt - hash
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* where hash is sha1-HMAC of username + | + year + salt
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* Salt and hash is base 36 encoded.
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*
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* The point of the salt is to ensure that a given user creates
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* different cookies on different machines, so that nobody
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* can after the fact figure out a single user has used both
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* machines.
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*/
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private function checkUserRecordGivenCookie( User $user, $cookieRecord ) {
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if ( !$this->validateCookieRecord( $cookieRecord ) ) {
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// Most callers will probably already check this, but
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// doesn't hurt to be careful.
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return false;
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}
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$parts = explode( "-", $cookieRecord, 3 );
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$hash = $this->generateUserCookieRecord( $user->getName(), $parts[0], $parts[1] );
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return hash_equals( $hash, $cookieRecord );
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}
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/**
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* Check if cookie is valid (Is not too old, has 3 fields)
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*
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* @param $cookieRecord Cookie record
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* @return boolean True if valid
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*/
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private function validateCookieRecord( $cookieRecord ) {
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$parts = explode( "-", $cookieRecord, 3 );
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if ( count( $parts ) !== 3 || strlen( $parts[0] ) !== 4 ) {
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$this->log->warning( "Got cookie with invalid format",
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[
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'method' => __METHOD__,
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'cookieRecord' => $cookie
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]
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);
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return false;
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}
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if ( (int)$parts[0] < gmdate( 'Y' ) - 3 ) {
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// Record is too old. If user hasn't logged in from this
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// computer in two years, should probably not consider it trusted.
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return false;
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}
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return true;
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}
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/**
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* Generate a single record for use in the previous login cookie
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*
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* The format is YYYY-SSSSSSS-HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
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* where Y is the year, S is a 32-bit salt, H is an sha1-hmac.
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* Both S and H are base-36 encoded. The actual cookie consists
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* of several of these records separated by a ".".
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*
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* When checking if a hash is valid, provide all three arguments.
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* When generating a new hash, only use the first argument.
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*
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* @param $username String Username,
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* @param $year int [Optional] Year. Default to current year
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* @param $salt string [Optional] Salt (expected to be base-36 encoded)
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* @return String A record for the cookie
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*/
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private function generateUserCookieRecord( $username, $year = false, $salt = false ) {
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if ( $year === false ) {
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$year = gmdate( 'Y' );
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}
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if ( $salt === false ) {
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$salt = wfBaseConvert( MWCryptRand::generateHex( 8 ), 16, 36 );
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}
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// FIXME Maybe shorten, e.g. User only half the hash?
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$res = hash_hmac( 'sha1', $username . '|' . $year . $salt, $this->secret );
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if ( !is_string( $res ) ) {
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throw new UnexpectedValueException( "Hash failed" );
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}
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$encoded = $year . '-' . $salt . '-' . wfBaseConvert( $res, 16, 36 );
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return $encoded;
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}
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/**
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* Get the cache key for the counter.
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*
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* @param $user User
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* @param $type string 'known' or 'new'
|
|
* @return string The cache key
|
|
*/
|
|
private function getKey( User $user, $type ) {
|
|
$userHash = Wikimedia\base_convert( sha1( $user->getName() ), 16, 36, 31 );
|
|
return $this->cache->makeGlobalKey(
|
|
'loginnotify', $type, $userHash
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Increment hit counters for a failed login from an unknown computer.
|
|
*
|
|
* If a sufficient number of hits have accumulated, send an echo notice.
|
|
*
|
|
* @param User $user
|
|
*/
|
|
private function incNewIP( User $user ) {
|
|
$key = $this->getKey( $user, 'new' );
|
|
$count = $this->checkAndIncKey(
|
|
$key,
|
|
$this->config->get( 'LoginNotifyAttemptsNewIP' ),
|
|
$this->config->get( 'LoginNotifyExpiryNewIP' )
|
|
);
|
|
if ( $count ) {
|
|
$this->sendNotice( $user, 'login-fail-new', $count );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Increment hit counters for a failed login from a known computer.
|
|
*
|
|
* If a sufficient number of hits have accumulated, send an echo notice.
|
|
*
|
|
* @param User $user
|
|
*/
|
|
private function incKnownIP( User $user ) {
|
|
$key = $this->getKey( $user, 'known' );
|
|
$count = $this->checkAndIncKey(
|
|
$key,
|
|
$this->config->get( 'LoginNotifyAttemptsKnownIP' ),
|
|
$this->config->get( 'LoginNotifyExpiryKnownIP' )
|
|
);
|
|
if ( $count ) {
|
|
$this->sendNotice( $user, 'login-fail-known', $count );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Send a notice about login attempts
|
|
*
|
|
* @param $user User The account in question
|
|
* @param $type String 'login-fail-new' or 'login-fail-known'
|
|
* @param $count int [Optional] How many failed attempts
|
|
*/
|
|
private function sendNotice( User $user, $type, $count = null ) {
|
|
$extra = [ 'notifyAgent' => true ];
|
|
if ( $count !== null ) {
|
|
$extra['count'] = $count;
|
|
}
|
|
EchoEvent::create( [
|
|
'type' => $type,
|
|
'extra' => $extra,
|
|
'agent' => $user,
|
|
] );
|
|
}
|
|
|
|
/**
|
|
* Check if we've reached limit, and increment cache key.
|
|
*
|
|
* @param $key string cache key
|
|
* @param $max int interval of one to send notice
|
|
* @param $expiry When to expire cache key.
|
|
* @return Bool|int false to not send notice, or number of hits
|
|
*/
|
|
private function checkAndIncKey( $key, $interval, $expiry ) {
|
|
$cache = $this->cache;
|
|
$cur = $cache->incr( $key );
|
|
if ( !$cur ) {
|
|
$cache->add( $key, 1, $expiry );
|
|
$cur = 1;
|
|
}
|
|
if ( $cur % $interval === 0 ) {
|
|
return $cur;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Clear attempt counter for user.
|
|
*
|
|
* When a user succesfully logs in, we start back from 0, as
|
|
* otherwise a mistake here and there will trigger the warning.
|
|
*
|
|
* @param $user User
|
|
*/
|
|
public function clearCounters( User $user ) {
|
|
$cache = $this->cache;
|
|
$keyKnown = $this->getKey( $user, 'known' );
|
|
$keyNew = $this->getKey( $user, 'new' );
|
|
|
|
$cache->delete( $keyKnown );
|
|
$cache->delete( $keyNew );
|
|
}
|
|
|
|
/**
|
|
* On login failure, record failure and maybe send notice
|
|
*
|
|
* @param $user User The user whose account was attempted to log into
|
|
*/
|
|
public function recordFailure( User $user ) {
|
|
$fromKnownIP = $this->isFromKnownIP( $user );
|
|
if ( $fromKnownIP ) {
|
|
$this->incKnownIP( $user );
|
|
} else {
|
|
$this->incNewIP( $user );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Send a notice on successful login if not known ip
|
|
*
|
|
* @param $user User Account in question
|
|
*/
|
|
public function sendSuccessNotice( User $user ) {
|
|
if ( $this->config->get( 'LoginNotifyEnableOnSuccess' )
|
|
&& !$this->isFromKnownIP( $user )
|
|
) {
|
|
$this->sendNotice( $user, 'login-success' );
|
|
}
|
|
}
|
|
}
|