mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
synced 2024-11-23 15:56:50 +00:00
1257 lines
37 KiB
PHP
1257 lines
37 KiB
PHP
<?php
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namespace MediaWiki\Extension\ConfirmEdit\SimpleCaptcha;
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use MailAddress;
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use MediaWiki\Api\ApiBase;
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use MediaWiki\Api\ApiEditPage;
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use MediaWiki\Auth\AuthenticationRequest;
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use MediaWiki\Cache\CacheKeyHelper;
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use MediaWiki\Config\Config;
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use MediaWiki\Config\ConfigException;
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use MediaWiki\Content\Content;
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use MediaWiki\Content\TextContent;
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use MediaWiki\Context\IContextSource;
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use MediaWiki\Context\RequestContext;
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use MediaWiki\EditPage\EditPage;
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use MediaWiki\Extension\ConfirmEdit\Auth\CaptchaAuthenticationRequest;
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use MediaWiki\Extension\ConfirmEdit\CaptchaTriggers;
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use MediaWiki\Extension\ConfirmEdit\Hooks\HookRunner;
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use MediaWiki\Extension\ConfirmEdit\Store\CaptchaStore;
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use MediaWiki\ExternalLinks\ExternalLinksLookup;
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use MediaWiki\ExternalLinks\LinkFilter;
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use MediaWiki\HTMLForm\HTMLForm;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\Message\Message;
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use MediaWiki\Output\OutputPage;
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use MediaWiki\Parser\ParserOptions;
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use MediaWiki\Registration\ExtensionRegistry;
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use MediaWiki\Request\ContentSecurityPolicy;
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use MediaWiki\Request\WebRequest;
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use MediaWiki\Revision\RevisionAccessException;
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use MediaWiki\Revision\SlotRecord;
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use MediaWiki\Status\Status;
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use MediaWiki\Title\Title;
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use MediaWiki\User\User;
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use OOUI\FieldLayout;
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use OOUI\HiddenInputWidget;
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use OOUI\NumberInputWidget;
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use UnexpectedValueException;
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use Wikimedia\IPUtils;
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use Wikimedia\Rdbms\IDBAccessObject;
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use WikiPage;
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/**
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* Demo CAPTCHA (not for production usage) and base class for real CAPTCHAs
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*/
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class SimpleCaptcha {
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/** @var string */
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protected static $messagePrefix = 'captcha-';
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/** @var bool Override to force showing the CAPTCHA to users who don't have "skipcaptcha" right. */
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private bool $forceShowCaptcha = false;
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/** @var bool|null Was the CAPTCHA already passed and if yes, with which result? */
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private ?bool $captchaSolved = null;
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/** @var bool Flag to indicate whether the onEditFilterMergedContent hook was invoked. */
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private bool $editFilterMergedContentHandlerCalled = false;
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/** @var bool[] Activate captchas status list for a pages by key */
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private $activatedCaptchas = [];
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/**
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* Used to select the right message.
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* One of sendmail, createaccount, badlogin, edit, create, addurl.
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* @var string
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*/
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protected $action;
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/** @var string Used in log messages. */
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protected $trigger;
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/**
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* @param string $action
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*/
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public function setAction( $action ) {
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$this->action = $action;
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}
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/**
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* @param string $trigger
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*/
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public function setTrigger( $trigger ) {
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$this->trigger = $trigger;
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}
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/**
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* Return the error from the last passCaptcha* call.
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* Not implemented but needed by some child classes.
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* @return mixed
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*/
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public function getError() {
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return null;
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}
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/**
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* Returns an array with 'question' and 'answer' keys.
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* Subclasses might use different structure.
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* Since MW 1.27 all subclasses must implement this method.
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* @return array
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*/
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public function getCaptcha() {
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$a = mt_rand( 0, 100 );
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$b = mt_rand( 0, 10 );
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/* Minus sign is used in the question. UTF-8,
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since the api uses text/plain, not text/html */
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$op = mt_rand( 0, 1 ) ? '+' : '−';
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// No space before and after $op, to ensure correct
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// directionality.
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$test = "$a$op$b";
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$answer = ( $op == '+' ) ? ( $a + $b ) : ( $a - $b );
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return [ 'question' => $test, 'answer' => $answer ];
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}
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/**
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* Returns a list of activated captchas for a page by key.
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* @return bool[]
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*/
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public function getActivatedCaptchas() {
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return $this->activatedCaptchas;
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}
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/**
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* @param array &$resultArr
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*/
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protected function addCaptchaAPI( &$resultArr ) {
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$captcha = $this->getCaptcha();
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$index = $this->storeCaptcha( $captcha );
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$resultArr['captcha'] = $this->describeCaptchaType();
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$resultArr['captcha']['id'] = $index;
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$resultArr['captcha']['question'] = $captcha['question'];
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}
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/**
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* Describes the captcha type for API clients.
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* @return array An array with keys 'type' and 'mime', and possibly other
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* implementation-specific
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*/
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public function describeCaptchaType() {
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return [
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'type' => 'simple',
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'mime' => 'text/plain',
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];
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}
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/**
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* Insert a captcha prompt into the edit form.
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* This sample implementation generates a simple arithmetic operation;
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* it would be easy to defeat by machine.
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*
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* Override this!
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*
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* It is not guaranteed that the CAPTCHA will load synchronously with the main page
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* content. So you cannot rely on registering handlers before page load. E.g.:
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*
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* NOT SAFE: $( window ).on( 'load', handler )
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* SAFE: $( handler )
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*
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* However, if the HTML is loaded dynamically via AJAX, the following order will
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* be used.
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*
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* headitems => modulestyles + modules => add main HTML to DOM when modulestyles +
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* modules are ready.
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*
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* @param int $tabIndex Tab index to start from
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*
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* @return array Associative array with the following keys:
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* string html - Main HTML
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* array modules (optional) - Array of ResourceLoader module names
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* array modulestyles (optional) - Array of ResourceLoader module names to be
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* included as style-only modules.
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* array headitems (optional) - Head items (see OutputPage::addHeadItems), as a numeric array
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* of raw HTML strings. Do not use unless no other option is feasible.
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*/
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public function getFormInformation( $tabIndex = 1 ) {
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$captcha = $this->getCaptcha();
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$index = $this->storeCaptcha( $captcha );
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return [
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'html' =>
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new FieldLayout(
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new NumberInputWidget( [
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'name' => 'wpCaptchaWord',
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'classes' => [ 'simplecaptcha-answer' ],
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'id' => 'wpCaptchaWord',
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'autocomplete' => 'off',
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// tab in before the edit textarea
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'tabIndex' => $tabIndex
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] ),
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[
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'align' => 'left',
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'label' => $captcha['question'] . ' = ',
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'classes' => [ 'simplecaptcha-field' ],
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]
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) .
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new HiddenInputWidget( [
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'name' => 'wpCaptchaId',
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'id' => 'wpCaptchaId',
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'value' => $index
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] ),
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'modulestyles' => [
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'ext.confirmEdit.simpleCaptcha'
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]
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];
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}
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/**
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* @return string[]
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*/
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public static function getCSPUrls() {
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return [];
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}
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/**
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* Adds the necessary CSP policies for the captcha module to work in a CSP enforced
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* setup.
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*
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* @param ContentSecurityPolicy $csp The CSP instance to add the policies to, usually
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* obtained from {@link OutputPage::getCSP()}
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*/
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public static function addCSPSources( ContentSecurityPolicy $csp ) {
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foreach ( static::getCSPUrls() as $src ) {
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$csp->addScriptSrc( $src );
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$csp->addStyleSrc( $src );
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}
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}
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/**
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* Uses getFormInformation() to get the CAPTCHA form and adds it to the given
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* OutputPage object.
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*
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* @param OutputPage $out The OutputPage object to which the form should be added
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* @param int $tabIndex See self::getFormInformation
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*/
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public function addFormToOutput( OutputPage $out, $tabIndex = 1 ) {
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$this->addFormInformationToOutput( $out, $this->getFormInformation( $tabIndex ) );
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}
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/**
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* Processes the given $formInformation array and adds the options (see getFormInformation())
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* to the given OutputPage object.
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*
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* @param OutputPage $out The OutputPage object to which the form should be added
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* @param array $formInformation
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*/
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public function addFormInformationToOutput( OutputPage $out, array $formInformation ) {
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static::addCSPSources( $out->getCSP() );
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if ( !$formInformation ) {
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return;
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}
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if ( isset( $formInformation['html'] ) ) {
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$out->addHTML( $formInformation['html'] );
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}
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if ( isset( $formInformation['modules'] ) ) {
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$out->addModules( $formInformation['modules'] );
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}
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if ( isset( $formInformation['modulestyles'] ) ) {
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$out->addModuleStyles( $formInformation['modulestyles'] );
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}
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if ( isset( $formInformation['headitems'] ) ) {
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$out->addHeadItems( $formInformation['headitems'] );
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}
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}
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/**
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* @param array $captchaData Data given by getCaptcha
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* @param string $id ID given by storeCaptcha
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* @return string Description of the captcha. Format is not specified; could be text, HTML, URL...
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*/
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public function getCaptchaInfo( $captchaData, $id ) {
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return array_key_exists( 'question', $captchaData ) ? ( $captchaData['question'] . ' =' ) : '';
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}
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/**
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* Show the error message for missing or incorrect captcha on EditPage.
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* @param EditPage $editPage
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* @param OutputPage $out
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*/
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public function showEditFormFields( EditPage $editPage, OutputPage $out ) {
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$out->enableOOUI();
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$page = $editPage->getArticle()->getPage();
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$key = CacheKeyHelper::getKeyForPage( $page );
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if ( !isset( $this->activatedCaptchas[$key] ) ) {
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return;
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}
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if ( $this->action !== 'edit' ) {
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unset( $this->activatedCaptchas[$key] );
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$out->addHTML( $this->getMessage( $this->action )->parseAsBlock() );
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$this->addFormToOutput( $out );
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}
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}
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/**
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* Insert the captcha prompt into an edit form.
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* @param EditPage $editPage
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*/
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public function editShowCaptcha( $editPage ) {
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$context = $editPage->getArticle()->getContext();
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$page = $editPage->getArticle()->getPage();
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$out = $context->getOutput();
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$key = CacheKeyHelper::getKeyForPage( $page );
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if ( isset( $this->activatedCaptchas[$key] ) ||
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$this->shouldCheck( $page, '', '', $context )
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) {
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$out->addHTML( $this->getMessage( $this->action )->parseAsBlock() );
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$this->addFormToOutput( $out );
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}
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unset( $this->activatedCaptchas[$key] );
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}
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/**
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* Show a message asking the user to enter a captcha on edit
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* The result will be treated as wiki text
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*
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* @param string $action Action being performed
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* @return Message
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*/
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public function getMessage( $action ) {
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// one of captcha-edit, captcha-addurl, captcha-badlogin, captcha-createaccount,
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// captcha-create, captcha-sendemail
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$name = static::$messagePrefix . $action;
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$msg = wfMessage( $name );
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// obtain a more tailored message, if possible, otherwise, fall back to
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// the default for edits
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return $msg->isDisabled() ? wfMessage( static::$messagePrefix . 'edit' ) : $msg;
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}
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/**
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* Inject whazawhoo
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* @fixme if multiple thingies insert a header, could break
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* @param HTMLForm $form
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* @return bool true to keep running callbacks
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*/
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public function injectEmailUser( HTMLForm $form ) {
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$out = $form->getOutput();
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$user = $form->getUser();
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if ( $this->triggersCaptcha( CaptchaTriggers::SENDEMAIL ) ) {
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$this->action = 'sendemail';
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if ( $this->canSkipCaptcha( $user, $form->getConfig() ) ) {
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return true;
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}
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$formInformation = $this->getFormInformation();
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$formMetainfo = $formInformation;
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unset( $formMetainfo['html'] );
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$this->addFormInformationToOutput( $out, $formMetainfo );
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$form->addFooterHtml(
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"<div class='captcha'>" .
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$this->getMessage( 'sendemail' )->parseAsBlock() .
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$formInformation['html'] .
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"</div>\n" );
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}
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return true;
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}
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/**
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* Check if the current IP is allowed to skip captchas. This checks
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* the whitelist from two sources.
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* 1) From the server-side config array $wgCaptchaWhitelistIP
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* 2) From the local [[MediaWiki:Captcha-ip-whitelist]] message
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*
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* @return bool true if whitelisted, false if not
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*/
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private function isIPWhitelisted() {
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global $wgCaptchaWhitelistIP, $wgRequest;
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$ip = $wgRequest->getIP();
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if ( $wgCaptchaWhitelistIP ) {
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if ( IPUtils::isInRanges( $ip, $wgCaptchaWhitelistIP ) ) {
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return true;
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}
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}
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$whitelistMsg = wfMessage( 'captcha-ip-whitelist' )->inContentLanguage();
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if ( !$whitelistMsg->isDisabled() ) {
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$whitelistedIPs = $this->getWikiIPWhitelist( $whitelistMsg );
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if ( IPUtils::isInRanges( $ip, $whitelistedIPs ) ) {
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return true;
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}
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}
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return false;
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}
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/**
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* Get the on-wiki IP whitelist stored in [[MediaWiki:Captcha-ip-whitelist]]
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* page from cache if possible.
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*
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* @param Message $msg whitelist Message on wiki
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* @return array whitelisted IP addresses or IP ranges, empty array if no whitelist
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*/
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private function getWikiIPWhitelist( Message $msg ) {
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$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$cacheKey = $cache->makeKey( 'confirmedit', 'ipwhitelist' );
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$cachedWhitelist = $cache->get( $cacheKey );
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if ( $cachedWhitelist === false ) {
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// Could not retrieve from cache so build the whitelist directly
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// from the wikipage
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$whitelist = $this->buildValidIPs(
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explode( "\n", $msg->plain() )
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);
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// And then store it in cache for one day. This cache is cleared on
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// modifications to the whitelist page.
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// @see MediaWiki\Extension\ConfirmEdit\Hooks::onPageSaveComplete()
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$cache->set( $cacheKey, $whitelist, 86400 );
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} else {
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// Whitelist from the cache
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$whitelist = $cachedWhitelist;
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}
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return $whitelist;
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}
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/**
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* From a list of unvalidated input, get all the valid
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* IP addresses and IP ranges from it.
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*
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* Note that only lines with just the IP address or IP range is considered
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* as valid. Whitespace is allowed, but if there is any other character on
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* the line, it's not considered as a valid entry.
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*
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* @param string[] $input
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* @return string[] of valid IP addresses and IP ranges
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*/
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private function buildValidIPs( array $input ) {
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// Remove whitespace and blank lines first
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$ips = array_map( 'trim', $input );
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$ips = array_filter( $ips );
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$validIPs = [];
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foreach ( $ips as $ip ) {
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if ( IPUtils::isIPAddress( $ip ) ) {
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$validIPs[] = $ip;
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}
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}
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return $validIPs;
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}
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/**
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* Check if the submitted form matches the captcha session data provided
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* by the plugin when the form was generated.
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*
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* Override this!
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*
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* @param string $answer
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* @param array $info
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* @return bool
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*/
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protected function keyMatch( $answer, $info ) {
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return $answer == $info['answer'];
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}
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// ----------------------------------
|
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/**
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* @param Title $title
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* @param string $action (edit/create/addurl...)
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* @return bool true if action triggers captcha on $title's namespace
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* @deprecated since 1.5.1 Use triggersCaptcha instead
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*/
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public function captchaTriggers( $title, $action ) {
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return $this->triggersCaptcha( $action, $title );
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}
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/**
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* Checks, whether the passed action should trigger a CAPTCHA. The optional $title parameter
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* will be used to check namespace specific CAPTCHA triggers.
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*
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* @param string $action The CAPTCHA trigger to check (see CaptchaTriggers for ConfirmEdit
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* built-in triggers)
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* @param Title|null $title An optional Title object, if the namespace specific triggers
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* should be checked, too.
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* @return bool True, if the action should trigger a CAPTCHA, false otherwise
|
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*/
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public function triggersCaptcha( $action, $title = null ) {
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// Captcha was already solved, we don't need to check anything else.
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if ( $this->isCaptchaSolved() ) {
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return false;
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}
|
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global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
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$result = false;
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$triggers = $wgCaptchaTriggers;
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$attributeCaptchaTriggers = ExtensionRegistry::getInstance()
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->getAttribute( CaptchaTriggers::EXT_REG_ATTRIBUTE_NAME );
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if ( is_array( $attributeCaptchaTriggers ) ) {
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$triggers += $attributeCaptchaTriggers;
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}
|
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if ( isset( $triggers[$action] ) ) {
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$result = $triggers[$action];
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}
|
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|
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if (
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$title !== null &&
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isset( $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action] )
|
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) {
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$result = $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action];
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}
|
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|
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// SimpleCaptcha has been instructed to force showing the CAPTCHA, no need to
|
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// check what other hook implementations think.
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if ( $this->shouldForceShowCaptcha() ) {
|
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return true;
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}
|
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|
||
$hookRunner = new HookRunner(
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||
MediaWikiServices::getInstance()->getHookContainer()
|
||
);
|
||
$hookRunner->onConfirmEditTriggersCaptcha( $action, $title, $result );
|
||
|
||
return $result;
|
||
}
|
||
|
||
/**
|
||
* @param WikiPage $page
|
||
* @param Content|string $content
|
||
* @param string $section
|
||
* @param IContextSource $context
|
||
* @param string|null $oldtext The content of the revision prior to $content When
|
||
* null this will be loaded from the database.
|
||
* @return bool true if the captcha should run
|
||
*/
|
||
public function shouldCheck( WikiPage $page, $content, $section, $context, $oldtext = null ) {
|
||
if ( !$context instanceof IContextSource ) {
|
||
$context = RequestContext::getMain();
|
||
}
|
||
|
||
$request = $context->getRequest();
|
||
$user = $context->getUser();
|
||
|
||
if ( $this->canSkipCaptcha( $user, $context->getConfig() ) ) {
|
||
return false;
|
||
}
|
||
|
||
$title = $page->getTitle();
|
||
$this->trigger = '';
|
||
|
||
if ( $content instanceof Content ) {
|
||
if ( $content->getModel() == CONTENT_MODEL_WIKITEXT ) {
|
||
$newtext = $content->getNativeData();
|
||
} else {
|
||
$newtext = null;
|
||
}
|
||
$isEmpty = $content->isEmpty();
|
||
} else {
|
||
$newtext = $content;
|
||
$isEmpty = $content === '';
|
||
}
|
||
|
||
if ( $this->triggersCaptcha( 'edit', $title ) ) {
|
||
// Check on all edits
|
||
$this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
|
||
$user->getName(),
|
||
$title->getPrefixedText() );
|
||
$this->action = 'edit';
|
||
wfDebug( "ConfirmEdit: checking all edits...\n" );
|
||
return true;
|
||
}
|
||
|
||
if ( $this->triggersCaptcha( 'create', $title ) && !$title->exists() ) {
|
||
// Check if creating a page
|
||
$this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
|
||
$user->getName(),
|
||
$title->getPrefixedText() );
|
||
$this->action = 'create';
|
||
wfDebug( "ConfirmEdit: checking on page creation...\n" );
|
||
return true;
|
||
}
|
||
|
||
// The following checks are expensive and should be done only,
|
||
// if we can assume, that the edit will be saved
|
||
if ( !$request->wasPosted() ) {
|
||
wfDebug(
|
||
"ConfirmEdit: request not posted, assuming that no content will be saved -> no CAPTCHA check"
|
||
);
|
||
return false;
|
||
}
|
||
|
||
if ( !$isEmpty && $this->triggersCaptcha( 'addurl', $title ) ) {
|
||
// Only check edits that add URLs
|
||
if ( $content instanceof Content ) {
|
||
// Get links from the database
|
||
$oldLinks = ExternalLinksLookup::getExternalLinksForPage(
|
||
$title->getArticleID(),
|
||
MediaWikiServices::getInstance()
|
||
->getConnectionProvider()
|
||
->getReplicaDatabase(),
|
||
__METHOD__
|
||
);
|
||
// Share a parse operation with Article::doEdit()
|
||
$editInfo = $page->prepareContentForEdit( $content, null, $user );
|
||
if ( $editInfo->output ) {
|
||
$newLinks = LinkFilter::getIndexedUrlsNonReversed(
|
||
array_keys( $editInfo->output->getExternalLinks() )
|
||
);
|
||
} else {
|
||
$newLinks = [];
|
||
}
|
||
} else {
|
||
// Get link changes in the slowest way known to man
|
||
$oldtext ??= $this->loadText( $title, $section );
|
||
$oldLinks = $this->findLinks( $title, $oldtext );
|
||
$newLinks = $this->findLinks( $title, $newtext );
|
||
}
|
||
|
||
$unknownLinks = array_filter( $newLinks, [ $this, 'filterLink' ] );
|
||
$addedLinks = array_diff( $unknownLinks, $oldLinks );
|
||
$numLinks = count( $addedLinks );
|
||
|
||
if ( $numLinks > 0 ) {
|
||
$this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
|
||
$numLinks,
|
||
$user->getName(),
|
||
$title->getPrefixedText(),
|
||
implode( ", ", $addedLinks ) );
|
||
$this->action = 'addurl';
|
||
return true;
|
||
}
|
||
}
|
||
|
||
global $wgCaptchaRegexes;
|
||
if ( $newtext !== null && $wgCaptchaRegexes ) {
|
||
if ( !is_array( $wgCaptchaRegexes ) ) {
|
||
throw new UnexpectedValueException(
|
||
'$wgCaptchaRegexes is required to be an array, ' . get_debug_type( $wgCaptchaRegexes ) . ' given.'
|
||
);
|
||
}
|
||
// Custom regex checks. Reuse $oldtext if set above.
|
||
$oldtext ??= $this->loadText( $title, $section );
|
||
|
||
foreach ( $wgCaptchaRegexes as $regex ) {
|
||
$newMatches = [];
|
||
if ( preg_match_all( $regex, $newtext, $newMatches ) ) {
|
||
$oldMatches = [];
|
||
preg_match_all( $regex, $oldtext, $oldMatches );
|
||
|
||
$addedMatches = array_diff( $newMatches[0], $oldMatches[0] );
|
||
|
||
$numHits = count( $addedMatches );
|
||
if ( $numHits > 0 ) {
|
||
// TODO: last parameter to sprintf() isn't used
|
||
$this->trigger = sprintf( "%dx %s at [[%s]]: %s",
|
||
$numHits,
|
||
$regex,
|
||
$user->getName(),
|
||
$title->getPrefixedText(),
|
||
implode( ", ", $addedMatches ) );
|
||
$this->action = 'edit';
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
public function isCaptchaSolved(): ?bool {
|
||
return $this->captchaSolved;
|
||
}
|
||
|
||
protected function setCaptchaSolved( ?bool $captchaSolved ): void {
|
||
$this->captchaSolved = $captchaSolved;
|
||
}
|
||
|
||
/**
|
||
* @return bool True if an override is set to force showing a CAPTCHA
|
||
* to the user. Note that users with "skipcaptcha" right may still
|
||
* bypass this override.
|
||
*/
|
||
public function shouldForceShowCaptcha(): bool {
|
||
return $this->forceShowCaptcha;
|
||
}
|
||
|
||
/**
|
||
* @param bool $forceShowCaptcha True if the caller wants to force showing
|
||
* a CAPTCHA to the user. Note that users with "skipcaptcha" right may
|
||
* still bypass this override.
|
||
* @return void
|
||
*/
|
||
public function setForceShowCaptcha( bool $forceShowCaptcha ): void {
|
||
$this->forceShowCaptcha = $forceShowCaptcha;
|
||
}
|
||
|
||
/**
|
||
* @return bool Was the EditFilterMergedContent hook implementation already
|
||
* invoked?
|
||
*/
|
||
public function editFilterMergedContentHandlerAlreadyInvoked(): bool {
|
||
return $this->editFilterMergedContentHandlerCalled;
|
||
}
|
||
|
||
/**
|
||
* @return void Set a flag on the class stating that EditFilterMergedContent handler
|
||
* was already run.
|
||
*/
|
||
public function setEditFilterMergedContentHandlerInvoked(): void {
|
||
$this->editFilterMergedContentHandlerCalled = true;
|
||
}
|
||
|
||
/**
|
||
* Filter callback function for URL whitelisting
|
||
* @param string $url string to check
|
||
* @return bool true if unknown, false if whitelisted
|
||
*/
|
||
private function filterLink( $url ) {
|
||
global $wgCaptchaWhitelist;
|
||
static $regexes = null;
|
||
|
||
if ( $regexes === null ) {
|
||
$source = wfMessage( 'captcha-addurl-whitelist' )->inContentLanguage();
|
||
|
||
$regexes = $source->isDisabled()
|
||
? []
|
||
: $this->buildRegexes( explode( "\n", $source->plain() ) );
|
||
|
||
if ( $wgCaptchaWhitelist !== false ) {
|
||
array_unshift( $regexes, $wgCaptchaWhitelist );
|
||
}
|
||
}
|
||
|
||
foreach ( $regexes as $regex ) {
|
||
if ( preg_match( $regex, $url ) ) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Build regex from whitelist
|
||
* @param string[] $lines string from [[MediaWiki:Captcha-addurl-whitelist]]
|
||
* @return string[] Regexes
|
||
* @private
|
||
*/
|
||
private function buildRegexes( $lines ) {
|
||
# Code duplicated from the SpamBlacklist extension (r19197)
|
||
# and later modified.
|
||
|
||
# Strip comments and whitespace, then remove blanks
|
||
$lines = array_filter( array_map( 'trim', preg_replace( '/#.*$/', '', $lines ) ) );
|
||
|
||
# No lines, don't make a regex which will match everything
|
||
if ( count( $lines ) == 0 ) {
|
||
wfDebug( "No lines\n" );
|
||
return [];
|
||
}
|
||
|
||
# Make regex
|
||
# It's faster using the S modifier even though it will usually only be run once
|
||
// $regex = 'http://+[a-z0-9_\-.]*(' . implode( '|', $lines ) . ')';
|
||
// return '/' . str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $regex) ) . '/Si';
|
||
$regexes = [];
|
||
$regexStart = [
|
||
'normal' => '/^(?:https?:)?\/\/+[a-z0-9_\-.]*(?:',
|
||
'noprotocol' => '/^(?:',
|
||
];
|
||
$regexEnd = [
|
||
'normal' => ')/Si',
|
||
'noprotocol' => ')/Si',
|
||
];
|
||
$regexMax = 4096;
|
||
$build = [];
|
||
foreach ( $lines as $line ) {
|
||
# Extract flags from the line
|
||
$options = [];
|
||
if ( preg_match( '/^(.*?)\s*<([^<>]*)>$/', $line, $matches ) ) {
|
||
if ( $matches[1] === '' ) {
|
||
wfDebug( "Line with empty regex\n" );
|
||
continue;
|
||
}
|
||
$line = $matches[1];
|
||
$opts = preg_split( '/\s*\|\s*/', trim( $matches[2] ) );
|
||
foreach ( $opts as $opt ) {
|
||
$opt = strtolower( $opt );
|
||
if ( $opt == 'noprotocol' ) {
|
||
$options['noprotocol'] = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
$key = isset( $options['noprotocol'] ) ? 'noprotocol' : 'normal';
|
||
|
||
// FIXME: not very robust size check, but should work. :)
|
||
if ( !isset( $build[$key] ) ) {
|
||
$build[$key] = $line;
|
||
} elseif ( strlen( $build[$key] ) + strlen( $line ) > $regexMax ) {
|
||
$regexes[] = $regexStart[$key] .
|
||
str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $build[$key] ) ) .
|
||
$regexEnd[$key];
|
||
$build[$key] = $line;
|
||
} else {
|
||
$build[$key] .= '|' . $line;
|
||
}
|
||
}
|
||
foreach ( $build as $key => $value ) {
|
||
$regexes[] = $regexStart[$key] .
|
||
str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $value ) ) .
|
||
$regexEnd[$key];
|
||
}
|
||
|
||
return $regexes;
|
||
}
|
||
|
||
/**
|
||
* Backend function for confirmEditMerged()
|
||
* @param WikiPage $page
|
||
* @param Content|string $newtext
|
||
* @param string $section
|
||
* @param IContextSource $context
|
||
* @param User $user
|
||
* @return bool false if the CAPTCHA is rejected, true otherwise
|
||
*/
|
||
private function doConfirmEdit(
|
||
WikiPage $page,
|
||
$newtext,
|
||
$section,
|
||
IContextSource $context,
|
||
User $user
|
||
) {
|
||
global $wgRequest;
|
||
$request = $context->getRequest();
|
||
|
||
// FIXME: Stop using wgRequest in other parts of ConfirmEdit so we can
|
||
// stop having to duplicate code for it.
|
||
if ( $request->getVal( 'captchaid' ) ) {
|
||
$request->setVal( 'wpCaptchaId', $request->getVal( 'captchaid' ) );
|
||
$wgRequest->setVal( 'wpCaptchaId', $request->getVal( 'captchaid' ) );
|
||
}
|
||
if ( $request->getVal( 'captchaword' ) ) {
|
||
$request->setVal( 'wpCaptchaWord', $request->getVal( 'captchaword' ) );
|
||
$wgRequest->setVal( 'wpCaptchaWord', $request->getVal( 'captchaword' ) );
|
||
}
|
||
if ( $this->shouldCheck( $page, $newtext, $section, $context ) ) {
|
||
return $this->passCaptchaLimitedFromRequest( $wgRequest, $user );
|
||
}
|
||
|
||
wfDebug( "ConfirmEdit: no need to show captcha.\n" );
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* An efficient edit filter callback based on the text after section merging
|
||
* @param IContextSource $context
|
||
* @param Content $content
|
||
* @param Status $status
|
||
* @param string $summary
|
||
* @param User $user
|
||
* @param bool $minorEdit
|
||
* @return bool
|
||
*/
|
||
public function confirmEditMerged( $context, $content, $status, $summary, $user, $minorEdit ) {
|
||
$title = $context->getTitle();
|
||
if ( !$title->canExist() ) {
|
||
// we check WikiPage only
|
||
// try to get an appropriate title for this page
|
||
$title = $context->getTitle();
|
||
if ( $title instanceof Title ) {
|
||
$title = $title->getFullText();
|
||
} else {
|
||
// otherwise it's an unknown page where this function is called from
|
||
$title = 'unknown';
|
||
}
|
||
// log this error, it could be a problem in another extension,
|
||
// edits should always have a WikiPage if
|
||
// they go through EditFilterMergedContent.
|
||
wfDebug( __METHOD__ . ': Skipped ConfirmEdit check: No WikiPage for title ' . $title );
|
||
return true;
|
||
}
|
||
$page = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $title );
|
||
if ( !$this->doConfirmEdit( $page, $content, '', $context, $user ) ) {
|
||
$status->value = EditPage::AS_HOOK_ERROR_EXPECTED;
|
||
$status->statusData = [];
|
||
// give an error message for the user to know, what goes wrong here.
|
||
// this can't be done for addurl trigger, because this requires one "free" save
|
||
// for the user, which we don't know, when he did it.
|
||
if ( $this->action === 'edit' ) {
|
||
// Default message is that the user failed a CAPTCHA, so show 'captcha-edit-fail'.
|
||
$message = 'captcha-edit-fail';
|
||
if ( $this->shouldForceShowCaptcha() ) {
|
||
// If an extension set the forceShowCaptcha property, then it likely means
|
||
// that the user already submitted an edit, and so the 'captcha-edit'
|
||
// message is more appropriate.
|
||
$message = 'captcha-edit';
|
||
[ , $word ] = $this->getCaptchaParamsFromRequest(
|
||
RequestContext::getMain()->getRequest()
|
||
);
|
||
// But if there's a word supplied in the request, then we should
|
||
// use 'captcha-edit-fail' as it indicates a failed attempt
|
||
// at solving the CAPTCHA by the user.
|
||
if ( $word ) {
|
||
$message = 'captcha-edit-fail';
|
||
}
|
||
}
|
||
$status->fatal( $message );
|
||
}
|
||
$this->addCaptchaAPI( $status->statusData );
|
||
$key = CacheKeyHelper::getKeyForPage( $page );
|
||
$this->activatedCaptchas[$key] = true;
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Logic to check if we need to pass a captcha for the current user
|
||
* to create a new account, or not
|
||
*
|
||
* @param User $creatingUser
|
||
* @return bool true to show captcha, false to skip captcha
|
||
*/
|
||
public function needCreateAccountCaptcha( User $creatingUser ) {
|
||
if ( $this->triggersCaptcha( CaptchaTriggers::CREATE_ACCOUNT ) ) {
|
||
return !$this->canSkipCaptcha( $creatingUser, MediaWikiServices::getInstance()->getMainConfig() );
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Check the captcha on Special:EmailUser
|
||
* @param MailAddress $from
|
||
* @param MailAddress $to
|
||
* @param string $subject
|
||
* @param string $text
|
||
* @param string &$error
|
||
* @return bool true to continue saving, false to abort and show a captcha form
|
||
*/
|
||
public function confirmEmailUser( $from, $to, $subject, $text, &$error ) {
|
||
global $wgRequest;
|
||
|
||
$user = RequestContext::getMain()->getUser();
|
||
if ( $this->triggersCaptcha( CaptchaTriggers::SENDEMAIL ) ) {
|
||
if ( $this->canSkipCaptcha( $user,
|
||
MediaWikiServices::getInstance()->getMainConfig() ) ) {
|
||
return true;
|
||
}
|
||
|
||
if ( defined( 'MW_API' ) ) {
|
||
# API mode
|
||
# Asking for captchas in the API is really silly
|
||
$error = Status::newFatal( 'captcha-disabledinapi' );
|
||
return false;
|
||
}
|
||
$this->trigger = "{$user->getName()} sending email";
|
||
if ( !$this->passCaptchaLimitedFromRequest( $wgRequest, $user ) ) {
|
||
$error = Status::newFatal( 'captcha-sendemail-fail' );
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* @param ApiBase $module
|
||
* @return bool
|
||
*/
|
||
protected function isAPICaptchaModule( $module ) {
|
||
return $module instanceof ApiEditPage;
|
||
}
|
||
|
||
/**
|
||
* @param ApiBase $module
|
||
* @param array &$params
|
||
* @param int $flags
|
||
* @return bool
|
||
*/
|
||
public function apiGetAllowedParams( ApiBase $module, &$params, $flags ) {
|
||
if ( $this->isAPICaptchaModule( $module ) ) {
|
||
$params['captchaword'] = [
|
||
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaword',
|
||
];
|
||
$params['captchaid'] = [
|
||
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaid',
|
||
];
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Checks, if the user reached the number of false CAPTCHAs and give him some vacation
|
||
* or run self::passCaptcha() and clear counter if correct.
|
||
*
|
||
* @param WebRequest $request
|
||
* @param User $user
|
||
* @return bool
|
||
*/
|
||
public function passCaptchaLimitedFromRequest( WebRequest $request, User $user ) {
|
||
[ $index, $word ] = $this->getCaptchaParamsFromRequest( $request );
|
||
return $this->passCaptchaLimited( $index, $word, $user );
|
||
}
|
||
|
||
/**
|
||
* @param WebRequest $request
|
||
* @return array [ captcha ID, captcha solution ]
|
||
*/
|
||
protected function getCaptchaParamsFromRequest( WebRequest $request ) {
|
||
$index = $request->getVal( 'wpCaptchaId' );
|
||
$word = $request->getVal( 'wpCaptchaWord' );
|
||
return [ $index, $word ];
|
||
}
|
||
|
||
/**
|
||
* Checks, if the user reached the number of false CAPTCHAs and give him some vacation
|
||
* or run self::passCaptcha() and clear counter if correct.
|
||
*
|
||
* @param string $index Captcha idenitifier
|
||
* @param string $word Captcha solution
|
||
* @param User $user User for throttling captcha solving attempts
|
||
* @return bool
|
||
* @see self::passCaptcha()
|
||
*/
|
||
public function passCaptchaLimited( $index, $word, User $user ) {
|
||
// don't increase pingLimiter here, just check, if CAPTCHA limit exceeded
|
||
if ( $user->pingLimiter( 'badcaptcha', 0 ) ) {
|
||
// for debugging add a proper error message, the user will just see a false captcha error message
|
||
$this->log( 'User reached RateLimit, preventing action' );
|
||
return false;
|
||
}
|
||
|
||
if ( $this->passCaptcha( $index, $word, $user ) ) {
|
||
return true;
|
||
}
|
||
|
||
// captcha was not solved: increase the limit and return false
|
||
$user->pingLimiter( 'badcaptcha' );
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Given a required captcha run, test form input for correct
|
||
* input on the open session.
|
||
* @param WebRequest $request
|
||
* @param User $user
|
||
* @return bool if passed, false if failed or new session
|
||
*/
|
||
public function passCaptchaFromRequest( WebRequest $request, User $user ) {
|
||
[ $index, $word ] = $this->getCaptchaParamsFromRequest( $request );
|
||
return $this->passCaptcha( $index, $word, $user );
|
||
}
|
||
|
||
/**
|
||
* Given a required captcha run, test form input for correct
|
||
* input on the open session.
|
||
* @param string $index Captcha identifier
|
||
* @param string $word Captcha solution
|
||
* @param User $user
|
||
* @return bool if passed, false if failed or new session
|
||
*/
|
||
protected function passCaptcha( $index, $word, $user ) {
|
||
// Don't check the same CAPTCHA twice in one session,
|
||
// if the CAPTCHA was already checked - Bug T94276
|
||
if ( $this->isCaptchaSolved() !== null ) {
|
||
return (bool)$this->isCaptchaSolved();
|
||
}
|
||
|
||
$info = $this->retrieveCaptcha( $index );
|
||
if ( $info ) {
|
||
if ( $this->keyMatch( $word, $info ) ) {
|
||
$this->log( "passed" );
|
||
$this->clearCaptcha( $index );
|
||
$this->setCaptchaSolved( true );
|
||
return true;
|
||
} else {
|
||
$this->clearCaptcha( $index );
|
||
$this->log( "bad form input" );
|
||
$this->setCaptchaSolved( false );
|
||
return false;
|
||
}
|
||
} else {
|
||
$this->log( "new captcha session" );
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Log the status and any triggering info for debugging or statistics
|
||
* @param string $message
|
||
*/
|
||
protected function log( $message ) {
|
||
wfDebugLog(
|
||
'captcha',
|
||
'ConfirmEdit: ' . $message . '; {trigger}',
|
||
'all',
|
||
[ 'trigger' => $this->trigger ]
|
||
);
|
||
}
|
||
|
||
/**
|
||
* Generate a captcha session ID and save the info in PHP's session storage.
|
||
* (Requires the user to have cookies enabled to get through the captcha.)
|
||
*
|
||
* A random ID is used so legit users can make edits in multiple tabs or
|
||
* windows without being unnecessarily hobbled by a serial order requirement.
|
||
* Pass the returned id value into the edit form as wpCaptchaId.
|
||
*
|
||
* @param array $info data to store
|
||
* @return string captcha ID key
|
||
*/
|
||
public function storeCaptcha( $info ) {
|
||
if ( !isset( $info['index'] ) ) {
|
||
// Assign random index if we're not udpating
|
||
$info['index'] = strval( mt_rand() );
|
||
}
|
||
CaptchaStore::get()->store( $info['index'], $info );
|
||
return $info['index'];
|
||
}
|
||
|
||
/**
|
||
* Fetch this session's captcha info.
|
||
* @param string $index
|
||
* @return array|false array of info, or false if missing
|
||
*/
|
||
public function retrieveCaptcha( $index ) {
|
||
return CaptchaStore::get()->retrieve( $index );
|
||
}
|
||
|
||
/**
|
||
* Clear out existing captcha info from the session, to ensure
|
||
* it can't be reused.
|
||
* @param string $index
|
||
*/
|
||
public function clearCaptcha( $index ) {
|
||
CaptchaStore::get()->clear( $index );
|
||
}
|
||
|
||
/**
|
||
* Retrieve the current version of the page or section being edited...
|
||
* @param Title $title
|
||
* @param string $section
|
||
* @param int $flags Flags for Revision loading methods
|
||
* @return string
|
||
* @private
|
||
*/
|
||
private function loadText( $title, $section, $flags = IDBAccessObject::READ_LATEST ) {
|
||
$revRecord = MediaWikiServices::getInstance()
|
||
->getRevisionLookup()
|
||
->getRevisionByTitle( $title, 0, $flags );
|
||
|
||
if ( $revRecord === null ) {
|
||
return "";
|
||
}
|
||
|
||
try {
|
||
$content = $revRecord->getContent( SlotRecord::MAIN );
|
||
} catch ( RevisionAccessException $e ) {
|
||
return '';
|
||
}
|
||
|
||
$text = ( $content instanceof TextContent ) ? $content->getText() : null;
|
||
if ( $section !== '' ) {
|
||
return MediaWikiServices::getInstance()->getParser()
|
||
->getSection( $text, $section );
|
||
}
|
||
|
||
return $text;
|
||
}
|
||
|
||
/**
|
||
* Extract a list of all recognized HTTP links in the text.
|
||
* @param Title $title
|
||
* @param string $text
|
||
* @return string[]
|
||
*/
|
||
private function findLinks( $title, $text ) {
|
||
$parser = MediaWikiServices::getInstance()->getParser();
|
||
$user = $parser->getUserIdentity();
|
||
$options = new ParserOptions( $user );
|
||
$text = $parser->preSaveTransform( $text, $title, $user, $options );
|
||
$out = $parser->parse( $text, $title, $options );
|
||
|
||
return array_keys( $out->getExternalLinks() );
|
||
}
|
||
|
||
/**
|
||
* Show a page explaining what this wacky thing is.
|
||
*/
|
||
public function showHelp() {
|
||
$context = RequestContext::getMain();
|
||
$out = $context->getOutput();
|
||
$out->setPageTitleMsg( $context->msg( 'captchahelp-title' ) );
|
||
$out->addWikiMsg( 'captchahelp-text' );
|
||
if ( CaptchaStore::get()->cookiesNeeded() ) {
|
||
$out->addWikiMsg( 'captchahelp-cookies-needed' );
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @return CaptchaAuthenticationRequest
|
||
*/
|
||
public function createAuthenticationRequest() {
|
||
$captchaData = $this->getCaptcha();
|
||
$id = $this->storeCaptcha( $captchaData );
|
||
return new CaptchaAuthenticationRequest( $id, $captchaData );
|
||
}
|
||
|
||
/**
|
||
* Modify the appearance of the captcha field
|
||
* @param AuthenticationRequest[] $requests
|
||
* @param array $fieldInfo Field description as given by AuthenticationRequest::mergeFieldInfo
|
||
* @param array &$formDescriptor A form descriptor suitable for the HTMLForm constructor
|
||
* @param string $action One of the AuthManager::ACTION_* constants
|
||
*/
|
||
public function onAuthChangeFormFields(
|
||
array $requests, array $fieldInfo, array &$formDescriptor, $action
|
||
) {
|
||
$req = AuthenticationRequest::getRequestByClass( $requests,
|
||
CaptchaAuthenticationRequest::class );
|
||
if ( !$req ) {
|
||
return;
|
||
}
|
||
|
||
$formDescriptor['captchaWord'] = [
|
||
'label-message' => null,
|
||
'autocomplete' => false,
|
||
'persistent' => false,
|
||
'required' => true,
|
||
] + $formDescriptor['captchaWord'];
|
||
}
|
||
|
||
/**
|
||
* Check whether the user provided / IP making the request is allowed to skip captchas
|
||
* @param User $user
|
||
* @param Config $config
|
||
* @return bool
|
||
* @throws ConfigException
|
||
*/
|
||
public function canSkipCaptcha( $user, Config $config ) {
|
||
$allowConfirmEmail = $config->get( 'AllowConfirmedEmail' );
|
||
|
||
if ( $user->isAllowed( 'skipcaptcha' ) ) {
|
||
wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
|
||
return true;
|
||
}
|
||
|
||
if ( $this->isIPWhitelisted() ) {
|
||
wfDebug( "ConfirmEdit: user IP is whitelisted" );
|
||
return true;
|
||
}
|
||
|
||
if ( $allowConfirmEmail && $user->isEmailConfirmed() ) {
|
||
wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
}
|