mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
synced 2024-09-24 02:39:43 +00:00
49fdcce0b1
If you are running multiple wikis, you probably want the rate limit on one wiki to apply to all wikis Bug: T126685 Change-Id: If5533f222eae9dc540b7c79606d7e7ce613f4e13
1051 lines
30 KiB
PHP
Executable file
1051 lines
30 KiB
PHP
Executable file
<?php
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use MediaWiki\Logger\LoggerFactory;
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class SimpleCaptcha {
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/** @var boolean|null Was the CAPTCHA already passed and if yes, with which result? */
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private $captchaSolved = null;
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function getCaptcha() {
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$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 array( 'question' => $test, 'answer' => $answer );
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}
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function addCaptchaAPI( &$resultArr ) {
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$captcha = $this->getCaptcha();
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$index = $this->storeCaptcha( $captcha );
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$resultArr['captcha']['type'] = 'simple';
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$resultArr['captcha']['mime'] = 'text/plain';
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$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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* 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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* @return string HTML
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*/
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function getForm( OutputPage $out, $tabIndex = 1 ) {
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$captcha = $this->getCaptcha();
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$index = $this->storeCaptcha( $captcha );
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return "<p><label for=\"wpCaptchaWord\">{$captcha['question']} = </label>" .
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Xml::element( 'input', array(
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'name' => 'wpCaptchaWord',
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'class' => 'mw-ui-input',
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'id' => 'wpCaptchaWord',
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'size' => 5,
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'autocomplete' => 'off',
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'tabindex' => $tabIndex ) ) . // tab in before the edit textarea
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"</p>\n" .
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Xml::element( 'input', array(
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'type' => 'hidden',
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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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/**
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* Show error message for missing or incorrect captcha on EditPage.
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* @param EditPage $editPage
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* @param OutputPage $out
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*/
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function showEditFormFields( &$editPage, &$out ) {
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$page = $editPage->getArticle()->getPage();
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if ( !isset( $page->ConfirmEdit_ActivateCaptcha ) ) {
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return;
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}
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if ( $this->action !== 'edit' ) {
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unset( $page->ConfirmEdit_ActivateCaptcha );
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$out->addWikiText( $this->getMessage( $this->action ) );
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$out->addHTML( $this->getForm( $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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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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if ( isset( $page->ConfirmEdit_ActivateCaptcha ) ||
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$this->shouldCheck( $page, '', '', $context )
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) {
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$out->addWikiText( $this->getMessage( $this->action ) );
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$out->addHTML( $this->getForm( $out ) );
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}
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unset( $page->ConfirmEdit_ActivateCaptcha );
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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 $action string Action being performed
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* @return string
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*/
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function getMessage( $action ) {
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$name = 'captcha-' . $action;
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$text = wfMessage( $name )->text();
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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 wfMessage( $name, $text )->isDisabled() ? wfMessage( 'captcha-edit' )->text() : $text;
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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 $form HTMLForm
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* @return bool true to keep running callbacks
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*/
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function injectEmailUser( &$form ) {
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global $wgCaptchaTriggers, $wgOut, $wgUser;
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if ( $wgCaptchaTriggers['sendemail'] ) {
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$this->action = 'sendemail';
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if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
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wfDebug( "ConfirmEdit: user group allows skipping captcha on email sending\n" );
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return true;
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}
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$form->addFooterText(
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"<div class='captcha'>" .
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$wgOut->parse( $this->getMessage( 'sendemail' ) ) .
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$this->getForm( $wgOut ) .
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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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* Inject whazawhoo
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* @fixme if multiple thingies insert a header, could break
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* @param QuickTemplate $template
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* @return bool true to keep running callbacks
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*/
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function injectUserCreate( &$template ) {
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global $wgCaptchaTriggers, $wgOut, $wgUser;
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if ( $wgCaptchaTriggers['createaccount'] ) {
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$this->action = 'usercreate';
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if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
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wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
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return true;
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}
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LoggerFactory::getInstance( 'authmanager' )->info( 'Captcha shown on account creation', array(
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'event' => 'captcha.display',
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'type' => 'accountcreation',
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) );
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$captcha = "<div class='captcha'>" .
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$wgOut->parse( $this->getMessage( 'createaccount' ) ) .
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// FIXME: Hardcoded tab index
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// Usually, the CAPTCHA is added after the E-Mail address field,
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// which actually has 6 as the tabIndex, but
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// there may are wikis which allows to mention the "real name",
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// which would have 7 as tabIndex, so increase
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// 6 by 2 and use it for the CAPTCHA -> 8 (the submit button has a tabIndex of 10)
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$this->getForm( $wgOut, 8 ) .
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"</div>\n";
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// for older MediaWiki versions
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if ( is_callable( array( $template, 'extend' ) ) ) {
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$template->extend( 'extrafields', $captcha );
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} else {
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$template->set( 'header', $captcha );
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}
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}
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return true;
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}
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/**
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* Inject a captcha into the user login form after a failed
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* password attempt as a speedbump for mass attacks.
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* @fixme if multiple thingies insert a header, could break
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* @param $template QuickTemplate
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* @return bool true to keep running callbacks
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*/
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function injectUserLogin( &$template ) {
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if ( $this->isBadLoginTriggered() ) {
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global $wgOut;
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LoggerFactory::getInstance( 'authmanager' )->info( 'Captcha shown on login', array(
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'event' => 'captcha.display',
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'type' => 'login',
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) );
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$this->action = 'badlogin';
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$captcha = "<div class='captcha'>" .
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$wgOut->parse( $this->getMessage( 'badlogin' ) ) .
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$this->getForm( $wgOut ) .
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"</div>\n";
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// for older MediaWiki versions
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if ( is_callable( array( $template, 'extend' ) ) ) {
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$template->extend( 'extrafields', $captcha );
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} else {
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$template->set( 'header', $captcha );
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}
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}
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return true;
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}
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/**
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* When a bad login attempt is made, increment an expiring counter
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* in the memcache cloud. Later checks for this may trigger a
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* captcha display to prevent too many hits from the same place.
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* @param User $user
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* @param string $password
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* @param int $retval authentication return value
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* @return bool true to keep running callbacks
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*/
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function triggerUserLogin( $user, $password, $retval ) {
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global $wgCaptchaTriggers, $wgCaptchaBadLoginExpiration, $wgMemc;
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if ( $retval == LoginForm::WRONG_PASS && $wgCaptchaTriggers['badlogin'] ) {
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$key = $this->badLoginKey();
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$count = $wgMemc->get( $key );
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if ( !$count ) {
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$wgMemc->add( $key, 0, $wgCaptchaBadLoginExpiration );
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}
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$wgMemc->incr( $key );
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}
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return true;
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}
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/**
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* Check if a bad login has already been registered for this
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* IP address. If so, require a captcha.
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* @return bool
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* @access private
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*/
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function isBadLoginTriggered() {
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global $wgMemc, $wgCaptchaTriggers, $wgCaptchaBadLoginAttempts;
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return $wgCaptchaTriggers['badlogin'] && intval(
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$wgMemc->get( $this->badLoginKey() )
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) >= $wgCaptchaBadLoginAttempts;
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}
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/**
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* Check if the IP is allowed to skip captchas
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*/
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function isIPWhitelisted() {
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global $wgCaptchaWhitelistIP;
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if ( $wgCaptchaWhitelistIP ) {
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global $wgRequest;
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$ip = $wgRequest->getIP();
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foreach ( $wgCaptchaWhitelistIP as $range ) {
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if ( IP::isInRange( $ip, $range ) ) {
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return true;
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}
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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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* Internal cache key for badlogin checks.
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* @return string
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* @access private
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*/
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function badLoginKey() {
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global $wgRequest;
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$ip = $wgRequest->getIP();
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return wfGlobalCacheKey( 'captcha', 'badlogin', 'ip', $ip );
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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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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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*/
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function captchaTriggers( $title, $action ) {
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global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
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// Special config for this NS?
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if ( isset( $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action] ) )
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return $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action];
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return ( !empty( $wgCaptchaTriggers[$action] ) ); // Default
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}
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/**
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* @param WikiPage $page
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* @param $content Content|string
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* @param $section string
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* @param IContextSource $context
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* @param $oldtext string The content of the revision prior to $content. When
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* null this will be loaded from the database.
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* @return bool true if the captcha should run
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*/
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function shouldCheck( WikiPage $page, $content, $section, $context, $oldtext = null ) {
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// @codingStandardsIgnoreStart
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global $ceAllowConfirmedEmail;
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// @codingStandardsIgnoreEnd
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if ( !$context instanceof IContextSource ) {
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$context = RequestContext::getMain();
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}
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$request = $context->getRequest();
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$user = $context->getUser();
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// captcha check exceptions, which will return always false
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if ( $user->isAllowed( 'skipcaptcha' ) ) {
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wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
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return false;
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} elseif ( $this->isIPWhitelisted() ) {
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wfDebug( "ConfirmEdit: user IP is whitelisted" );
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return false;
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} elseif ( $ceAllowConfirmedEmail && $user->isEmailConfirmed() ) {
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wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
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return false;
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}
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$title = $page->getTitle();
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$this->trigger = '';
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if ( $content instanceof Content ) {
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if ( $content->getModel() == CONTENT_MODEL_WIKITEXT ) {
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$newtext = $content->getNativeData();
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} else {
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$newtext = null;
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}
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$isEmpty = $content->isEmpty();
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} else {
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$newtext = $content;
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$isEmpty = $content === '';
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}
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if ( $this->captchaTriggers( $title, 'edit' ) ) {
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// Check on all edits
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$this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
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$user->getName(),
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$title->getPrefixedText() );
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$this->action = 'edit';
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wfDebug( "ConfirmEdit: checking all edits...\n" );
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return true;
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}
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if ( $this->captchaTriggers( $title, 'create' ) && !$title->exists() ) {
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// Check if creating a page
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$this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
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$user->getName(),
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$title->getPrefixedText() );
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$this->action = 'create';
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wfDebug( "ConfirmEdit: checking on page creation...\n" );
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return true;
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}
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// The following checks are expensive and should be done only,
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// if we can assume, that the edit will be saved
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if ( !$request->wasPosted() ) {
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wfDebug(
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"ConfirmEdit: request not posted, assuming that no content will be saved -> no CAPTCHA check"
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);
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return false;
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}
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if ( !$isEmpty && $this->captchaTriggers( $title, 'addurl' ) ) {
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// Only check edits that add URLs
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if ( $content instanceof Content ) {
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// Get links from the database
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$oldLinks = $this->getLinksFromTracker( $title );
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// Share a parse operation with Article::doEdit()
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$editInfo = $page->prepareContentForEdit( $content );
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if ( $editInfo->output ) {
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$newLinks = array_keys( $editInfo->output->getExternalLinks() );
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} else {
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$newLinks = array();
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}
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} else {
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// Get link changes in the slowest way known to man
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$oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section );
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$oldLinks = $this->findLinks( $title, $oldtext );
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$newLinks = $this->findLinks( $title, $newtext );
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}
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$unknownLinks = array_filter( $newLinks, array( &$this, 'filterLink' ) );
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$addedLinks = array_diff( $unknownLinks, $oldLinks );
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$numLinks = count( $addedLinks );
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if ( $numLinks > 0 ) {
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$this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
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$numLinks,
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$user->getName(),
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$title->getPrefixedText(),
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implode( ", ", $addedLinks ) );
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$this->action = 'addurl';
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return true;
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}
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}
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global $wgCaptchaRegexes;
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if ( $newtext !== null && $wgCaptchaRegexes ) {
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if ( !is_array( $wgCaptchaRegexes ) ) {
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throw new UnexpectedValueException(
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'$wgCaptchaRegexes is required to be an array, ' . gettype( $wgCaptchaRegexes ) . ' given.'
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);
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}
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// Custom regex checks. Reuse $oldtext if set above.
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$oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section );
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foreach ( $wgCaptchaRegexes as $regex ) {
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$newMatches = array();
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if ( preg_match_all( $regex, $newtext, $newMatches ) ) {
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$oldMatches = array();
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preg_match_all( $regex, $oldtext, $oldMatches );
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$addedMatches = array_diff( $newMatches[0], $oldMatches[0] );
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$numHits = count( $addedMatches );
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if ( $numHits > 0 ) {
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$this->trigger = sprintf( "%dx %s at [[%s]]: %s",
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$numHits,
|
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$regex,
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$user->getName(),
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$title->getPrefixedText(),
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implode( ", ", $addedMatches ) );
|
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$this->action = 'edit';
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return true;
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}
|
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}
|
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}
|
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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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* Filter callback function for URL whitelisting
|
||
* @param $url string to check
|
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* @return bool true if unknown, false if whitelisted
|
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* @access private
|
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*/
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function filterLink( $url ) {
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global $wgCaptchaWhitelist;
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static $regexes = null;
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if ( $regexes === null ) {
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$source = wfMessage( 'captcha-addurl-whitelist' )->inContentLanguage();
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|
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$regexes = $source->isDisabled()
|
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? array()
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: $this->buildRegexes( explode( "\n", $source->plain() ) );
|
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|
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if ( $wgCaptchaWhitelist !== false ) {
|
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array_unshift( $regexes, $wgCaptchaWhitelist );
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}
|
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}
|
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|
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foreach ( $regexes as $regex ) {
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if ( preg_match( $regex, $url ) ) {
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return false;
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}
|
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}
|
||
|
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return true;
|
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}
|
||
|
||
/**
|
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* Build regex from whitelist
|
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* @param $lines string from [[MediaWiki:Captcha-addurl-whitelist]]
|
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* @return array Regexes
|
||
* @access private
|
||
*/
|
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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 array();
|
||
} else {
|
||
# 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 = array();
|
||
$regexStart = array(
|
||
'normal' => '/^(?:https?:)?\/\/+[a-z0-9_\-.]*(?:',
|
||
'noprotocol' => '/^(?:',
|
||
);
|
||
$regexEnd = array(
|
||
'normal' => ')/Si',
|
||
'noprotocol' => ')/Si',
|
||
);
|
||
$regexMax = 4096;
|
||
$build = array();
|
||
foreach ( $lines as $line ) {
|
||
# Extract flags from the line
|
||
$options = array();
|
||
if ( preg_match( '/^(.*?)\s*<([^<>]*)>$/', $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( '|\\\*/|', '/', $build[$key] ) ) .
|
||
$regexEnd[$key];
|
||
}
|
||
return $regexes;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Load external links from the externallinks table
|
||
* @param $title Title
|
||
* @return Array
|
||
*/
|
||
function getLinksFromTracker( $title ) {
|
||
$dbr = wfGetDB( DB_SLAVE );
|
||
$id = $title->getArticleID(); // should be zero queries
|
||
$res = $dbr->select( 'externallinks', array( 'el_to' ),
|
||
array( 'el_from' => $id ), __METHOD__ );
|
||
$links = array();
|
||
foreach ( $res as $row ) {
|
||
$links[] = $row->el_to;
|
||
}
|
||
return $links;
|
||
}
|
||
|
||
/**
|
||
* Backend function for confirmEdit() and confirmEditAPI()
|
||
* @param WikiPage $page
|
||
* @param $newtext string
|
||
* @param $section
|
||
* @param IContextSource $context
|
||
* @return bool false if the CAPTCHA is rejected, true otherwise
|
||
*/
|
||
private function doConfirmEdit( WikiPage $page, $newtext, $section, IContextSource $context ) {
|
||
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->passCaptchaLimited();
|
||
} else {
|
||
wfDebug( "ConfirmEdit: no need to show captcha.\n" );
|
||
return true;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* An efficient edit filter callback based on the text after section merging
|
||
* @param RequestContext $context
|
||
* @param Content $content
|
||
* @param Status $status
|
||
* @param $summary
|
||
* @param $user
|
||
* @param $minorEdit
|
||
* @return bool
|
||
*/
|
||
function confirmEditMerged( $context, $content, $status, $summary, $user, $minorEdit ) {
|
||
$legacyMode = !defined( 'MW_EDITFILTERMERGED_SUPPORTS_API' );
|
||
if ( defined( 'MW_API' ) && $legacyMode ) {
|
||
# API mode
|
||
# The CAPTCHA was already checked and approved
|
||
return true;
|
||
}
|
||
if ( !$context->canUseWikiPage() ) {
|
||
// 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 = $context->getWikiPage();
|
||
if ( !$this->doConfirmEdit( $page, $content, false, $context ) ) {
|
||
if ( $legacyMode ) {
|
||
$status->fatal( 'hookaborted' );
|
||
}
|
||
$status->value = EditPage::AS_HOOK_ERROR_EXPECTED;
|
||
$status->apiHookResult = array();
|
||
// 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' ) {
|
||
$status->fatal(
|
||
new RawMessage(
|
||
Html::element(
|
||
'div',
|
||
array( 'class' => 'errorbox' ),
|
||
$context->msg( 'captcha-edit-fail' )->text()
|
||
)
|
||
)
|
||
);
|
||
}
|
||
$this->addCaptchaAPI( $status->apiHookResult );
|
||
$page->ConfirmEdit_ActivateCaptcha = true;
|
||
return $legacyMode;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
function confirmEditAPI( $editPage, $newText, &$resultArr ) {
|
||
$page = $editPage->getArticle()->getPage();
|
||
if ( !$this->doConfirmEdit( $page, $newText, false, $editPage->getArticle()->getContext() ) ) {
|
||
$this->addCaptchaAPI( $resultArr );
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Hook for user creation form submissions.
|
||
* @param User $u
|
||
* @param string $message
|
||
* @param Status $status
|
||
* @return bool true to continue, false to abort user creation
|
||
*/
|
||
function confirmUserCreate( $u, &$message, &$status = null ) {
|
||
if ( $this->needCreateAccountCaptcha() ) {
|
||
$this->trigger = "new account '" . $u->getName() . "'";
|
||
$success = $this->passCaptchaLimited();
|
||
LoggerFactory::getInstance(
|
||
'authmanager'
|
||
)->info( 'Captcha submitted on account creation', array(
|
||
'event' => 'captcha.submit',
|
||
'type' => 'accountcreation',
|
||
'successful' => $success,
|
||
) );
|
||
if ( !$success ) {
|
||
// For older MediaWiki
|
||
$message = wfMessage( 'captcha-createaccount-fail' )->text();
|
||
// For MediaWiki 1.23+
|
||
$status = Status::newGood();
|
||
|
||
// Apply a *non*-fatal warning. This will still abort the
|
||
// account creation but returns a "Warning" response to the
|
||
// API or UI.
|
||
$status->warning( 'captcha-createaccount-fail' );
|
||
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
|
||
*
|
||
* @return bool true to show captcha, false to skip captcha
|
||
*/
|
||
function needCreateAccountCaptcha() {
|
||
global $wgCaptchaTriggers, $wgUser;
|
||
if ( $wgCaptchaTriggers['createaccount'] ) {
|
||
if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
|
||
wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
|
||
return false;
|
||
}
|
||
if ( $this->isIPWhitelisted() ) {
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Hook for user login form submissions.
|
||
* @param $u User
|
||
* @param $pass
|
||
* @param $retval
|
||
* @return bool true to continue, false to abort user creation
|
||
*/
|
||
function confirmUserLogin( $u, $pass, &$retval ) {
|
||
if ( $this->isBadLoginTriggered() ) {
|
||
if ( $this->isIPWhitelisted() )
|
||
return true;
|
||
|
||
$this->trigger = "post-badlogin login '" . $u->getName() . "'";
|
||
$success = $this->passCaptchaLimited();
|
||
LoggerFactory::getInstance( 'authmanager' )->info( 'Captcha submitted on login', array(
|
||
'event' => 'captcha.submit',
|
||
'type' => 'login',
|
||
'successful' => $success,
|
||
) );
|
||
if ( !$success ) {
|
||
// Emulate a bad-password return to confuse the shit out of attackers
|
||
$retval = LoginForm::WRONG_PASS;
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Check the captcha on Special:EmailUser
|
||
* @param $from MailAddress
|
||
* @param $to MailAddress
|
||
* @param $subject String
|
||
* @param $text String
|
||
* @param $error String reference
|
||
* @return Bool true to continue saving, false to abort and show a captcha form
|
||
*/
|
||
function confirmEmailUser( $from, $to, $subject, $text, &$error ) {
|
||
global $wgCaptchaTriggers, $wgUser;
|
||
if ( $wgCaptchaTriggers['sendemail'] ) {
|
||
if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
|
||
wfDebug( "ConfirmEdit: user group allows skipping captcha on email sending\n" );
|
||
return true;
|
||
}
|
||
if ( $this->isIPWhitelisted() )
|
||
return true;
|
||
|
||
if ( defined( 'MW_API' ) ) {
|
||
# API mode
|
||
# Asking for captchas in the API is really silly
|
||
$error = wfMessage( 'captcha-disabledinapi' )->text();
|
||
return false;
|
||
}
|
||
$this->trigger = "{$wgUser->getName()} sending email";
|
||
if ( !$this->passCaptchaLimited() ) {
|
||
$error = wfMessage( 'captcha-sendemail-fail' )->text();
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* @param $module ApiBase
|
||
* @return bool
|
||
*/
|
||
protected function isAPICaptchaModule( $module ) {
|
||
return $module instanceof ApiEditPage || $module instanceof ApiCreateAccount;
|
||
}
|
||
|
||
/**
|
||
* @param $module ApiBase
|
||
* @param $params array
|
||
* @param $flags int
|
||
* @return bool
|
||
*/
|
||
public function APIGetAllowedParams( &$module, &$params, $flags ) {
|
||
if ( $this->isAPICaptchaModule( $module ) ) {
|
||
if ( defined( 'ApiBase::PARAM_HELP_MSG' ) ) {
|
||
$params['captchaword'] = array(
|
||
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaword',
|
||
);
|
||
$params['captchaid'] = array(
|
||
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaid',
|
||
);
|
||
} else {
|
||
// @todo: Remove this branch when support for MediaWiki < 1.25 is dropped
|
||
$params['captchaword'] = null;
|
||
$params['captchaid'] = null;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* @deprecated Since MediaWiki 1.25
|
||
* @param $module ApiBase
|
||
* @param $desc array
|
||
* @return bool
|
||
*/
|
||
public function APIGetParamDescription( &$module, &$desc ) {
|
||
if ( $this->isAPICaptchaModule( $module ) ) {
|
||
$desc['captchaid'] = 'CAPTCHA ID from previous request';
|
||
$desc['captchaword'] = 'Answer to the CAPTCHA';
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Checks, if the user reached the amount of false CAPTCHAs and give him some vacation
|
||
* or run self::passCaptcha() and clear counter if correct.
|
||
*
|
||
* @see self::passCaptcha()
|
||
*/
|
||
public function passCaptchaLimited() {
|
||
global $wgUser;
|
||
|
||
// don't increase pingLimiter here, just check, if CAPTCHA limit exceeded
|
||
if ( $wgUser->pingLimiter( 'badcaptcha', 0 ) ) {
|
||
// for debugging add an proper error message, the user just see an false captcha error message
|
||
$this->log( 'User reached RateLimit, preventing action.' );
|
||
return false;
|
||
}
|
||
|
||
if ( $this->passCaptcha() ) {
|
||
return true;
|
||
}
|
||
|
||
// captcha was not solved: increase limit and return false
|
||
$wgUser->pingLimiter( 'badcaptcha' );
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Given a required captcha run, test form input for correct
|
||
* input on the open session.
|
||
* @return bool if passed, false if failed or new session
|
||
*/
|
||
function passCaptcha() {
|
||
global $wgRequest;
|
||
|
||
// Don't check the same CAPTCHA twice in one session,
|
||
// if the CAPTCHA was already checked - Bug T94276
|
||
if ( isset( $this->captchaSolved ) ) {
|
||
return $this->captchaSolved;
|
||
}
|
||
|
||
$info = $this->retrieveCaptcha( $wgRequest );
|
||
if ( $info ) {
|
||
if ( $this->keyMatch( $wgRequest->getVal( 'wpCaptchaWord' ), $info ) ) {
|
||
$this->log( "passed" );
|
||
$this->clearCaptcha( $info );
|
||
$this->captchaSolved = true;
|
||
return true;
|
||
} else {
|
||
$this->clearCaptcha( $info );
|
||
$this->log( "bad form input" );
|
||
$this->captchaSolved = 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
|
||
*/
|
||
function log( $message ) {
|
||
wfDebugLog( 'captcha', 'ConfirmEdit: ' . $message . '; ' . $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
|
||
*/
|
||
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.
|
||
* @return mixed array of info, or false if missing
|
||
*/
|
||
function retrieveCaptcha() {
|
||
global $wgRequest;
|
||
$index = $wgRequest->getVal( 'wpCaptchaId' );
|
||
return CaptchaStore::get()->retrieve( $index );
|
||
}
|
||
|
||
/**
|
||
* Clear out existing captcha info from the session, to ensure
|
||
* it can't be reused.
|
||
*/
|
||
function clearCaptcha( $info ) {
|
||
CaptchaStore::get()->clear( $info['index'] );
|
||
}
|
||
|
||
/**
|
||
* Retrieve the current version of the page or section being edited...
|
||
* @param Title $title
|
||
* @param string $section
|
||
* @param integer $flags Flags for Revision loading methods
|
||
* @return string
|
||
* @access private
|
||
*/
|
||
function loadText( $title, $section, $flags = Revision::READ_LATEST ) {
|
||
$rev = Revision::newFromTitle( $title, false, $flags );
|
||
if ( is_null( $rev ) ) {
|
||
return "";
|
||
} else {
|
||
$text = $rev->getText();
|
||
if ( $section != '' ) {
|
||
global $wgParser;
|
||
return $wgParser->getSection( $text, $section );
|
||
} else {
|
||
return $text;
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Extract a list of all recognized HTTP links in the text.
|
||
* @param $title Title
|
||
* @param $text string
|
||
* @return array of strings
|
||
*/
|
||
function findLinks( $title, $text ) {
|
||
global $wgParser, $wgUser;
|
||
|
||
$options = new ParserOptions();
|
||
$text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
|
||
$out = $wgParser->parse( $text, $title, $options );
|
||
|
||
return array_keys( $out->getExternalLinks() );
|
||
}
|
||
|
||
/**
|
||
* Show a page explaining what this wacky thing is.
|
||
*/
|
||
function showHelp() {
|
||
global $wgOut;
|
||
$wgOut->setPageTitle( wfMessage( 'captchahelp-title' )->text() );
|
||
$wgOut->addWikiMsg( 'captchahelp-text' );
|
||
if ( CaptchaStore::get()->cookiesNeeded() ) {
|
||
$wgOut->addWikiMsg( 'captchahelp-cookies-needed' );
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Pass API captcha parameters on to the login form when using
|
||
* API account creation.
|
||
*
|
||
* @param ApiCreateAccount $apiModule
|
||
* @param LoginForm $loginForm
|
||
* @return hook return value
|
||
*/
|
||
function addNewAccountApiForm( $apiModule, $loginForm ) {
|
||
global $wgRequest;
|
||
$main = $apiModule->getMain();
|
||
|
||
$id = $main->getVal( 'captchaid' );
|
||
if ( $id ) {
|
||
$wgRequest->setVal( 'wpCaptchaId', $id );
|
||
|
||
// Suppress "unrecognized parameter" warning:
|
||
$main->getVal( 'wpCaptchaId' );
|
||
}
|
||
|
||
$word = $main->getVal( 'captchaword' );
|
||
if ( $word ) {
|
||
$wgRequest->setVal( 'wpCaptchaWord', $word );
|
||
|
||
// Suppress "unrecognized parameter" warning:
|
||
$main->getVal( 'wpCaptchaWord' );
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Pass extra data back in API results for account creation.
|
||
*
|
||
* @param ApiCreateAccount $apiModule
|
||
* @param LoginForm &loginPage
|
||
* @param array &$result
|
||
* @return bool: Hook return value
|
||
*/
|
||
function addNewAccountApiResult( $apiModule, $loginPage, &$result ) {
|
||
if ( $result['result'] !== 'Success' && $this->needCreateAccountCaptcha() ) {
|
||
|
||
// If we failed a captcha, override the generic 'Warning' result string
|
||
if ( $result['result'] === 'Warning' && isset( $result['warnings'] ) ) {
|
||
foreach ( $result['warnings'] as $warning ) {
|
||
if ( $warning['message'] === 'captcha-createaccount-fail' ) {
|
||
$this->addCaptchaAPI( $result );
|
||
$result['result'] = 'NeedCaptcha';
|
||
|
||
LoggerFactory::getInstance(
|
||
'authmanager'
|
||
)->info( 'Captcha data added in account creation API', array(
|
||
'event' => 'captcha.display',
|
||
'type' => 'accountcreation',
|
||
) );
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
}
|