mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
synced 2024-11-30 19:04:29 +00:00
681 lines
19 KiB
PHP
681 lines
19 KiB
PHP
<?php
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class SimpleCaptcha {
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function __construct() {
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global $wgCaptchaStorageClass;
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$this->storage = new $wgCaptchaStorageClass;
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}
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function getCaptcha() {
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$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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$test = "$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'] = $captcha['question'];
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}
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/**
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* Insert a captcha prompt into the edit form.
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* This sample implementation generates a simple arithmetic operation;
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* it would be easy to defeat by machine.
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*
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* Override this!
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*
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* @return string HTML
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*/
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function getForm() {
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$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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'id' => 'wpCaptchaWord',
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'tabindex' => 1 ) ) . // 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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* Insert the captcha prompt into an edit form.
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* @param OutputPage $out
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*/
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function editCallback( &$out ) {
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$out->addWikiText( $this->getMessage( $this->action ) );
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$out->addHTML( $this->getForm() );
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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 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 = wfMsg( $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 wfEmptyMsg( $name, $text ) ? wfMsg( 'captcha-edit' ) : $text;
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}
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/**
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* Inject whazawhoo
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* @fixme if multiple thingies insert a header, could break
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* @param HTMLForm
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* @return bool true to keep running callbacks
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*/
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function injectEmailUser( &$form ) {
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global $wgCaptchaTriggers, $wgOut, $wgUser;
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if ( $wgCaptchaTriggers['sendemail'] ) {
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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() .
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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 SimpleTemplate $template
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* @return bool true to keep running callbacks
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*/
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function injectUserCreate( &$template ) {
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global $wgCaptchaTriggers, $wgOut, $wgUser;
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if ( $wgCaptchaTriggers['createaccount'] ) {
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if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
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wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
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return true;
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}
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$template->set( 'header',
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"<div class='captcha'>" .
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$wgOut->parse( $this->getMessage( 'createaccount' ) ) .
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$this->getForm() .
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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 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 SimpleTemplate $template
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* @return bool true to keep running callbacks
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*/
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function injectUserLogin( &$template ) {
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if ( $this->isBadLoginTriggered() ) {
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global $wgOut;
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$template->set( 'header',
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"<div class='captcha'>" .
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$wgOut->parse( $this->getMessage( 'badlogin' ) ) .
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$this->getForm() .
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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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* 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, $wgCaptchaBadLoginExpiration );
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}
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$count = $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, $wgCaptchaBadLoginAttempts;
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return intval( $wgMemc->get( $this->badLoginKey() ) ) >= $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 ( $wgCaptchaWhitelistIP ) {
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$ip = wfGetIp();
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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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return wfMemcKey( 'captcha', 'badlogin', 'ip', wfGetIP() );
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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 EditPage $editPage
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* @param string $action (edit/create/addurl...)
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* @return bool true if action triggers captcha on editPage's namespace
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*/
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function captchaTriggers( &$editPage, $action ) {
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global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
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// Special config for this NS?
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if ( isset( $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action] ) )
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return $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action];
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return ( !empty( $wgCaptchaTriggers[$action] ) ); // Default
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}
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/**
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* @param EditPage $editPage
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* @param string $newtext
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* @param string $section
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* @return bool true if the captcha should run
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*/
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function shouldCheck( &$editPage, $newtext, $section, $merged = false ) {
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$this->trigger = '';
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$title = $editPage->mArticle->getTitle();
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global $wgUser;
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if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
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wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
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return false;
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}
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if ( $this->isIPWhitelisted() )
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return false;
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global $wgEmailAuthentication, $ceAllowConfirmedEmail;
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if ( $wgEmailAuthentication && $ceAllowConfirmedEmail &&
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$wgUser->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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if ( $this->captchaTriggers( $editPage, 'edit' ) ) {
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// Check on all edits
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global $wgUser;
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$this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
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$wgUser->getName(),
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$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( $editPage, 'create' ) && !$editPage->mTitle->exists() ) {
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// Check if creating a page
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global $wgUser;
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$this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
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$wgUser->getName(),
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$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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if ( $this->captchaTriggers( $editPage, 'addurl' ) ) {
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// Only check edits that add URLs
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if ( $merged ) {
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// Get links from the database
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$oldLinks = $this->getLinksFromTracker( $title );
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// Share a parse operation with Article::doEdit()
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$editInfo = $editPage->mArticle->prepareTextForEdit( $newtext );
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$newLinks = array_keys( $editInfo->output->getExternalLinks() );
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} else {
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// Get link changes in the slowest way known to man
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$oldtext = $this->loadText( $editPage, $section );
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$oldLinks = $this->findLinks( $editPage, $oldtext );
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$newLinks = $this->findLinks( $editPage, $newtext );
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}
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$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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global $wgUser;
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$this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
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$numLinks,
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$wgUser->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 ( $wgCaptchaRegexes ) {
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// Custom regex checks
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$oldtext = $this->loadText( $editPage, $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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global $wgUser;
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$this->trigger = sprintf( "%dx %s at [[%s]]: %s",
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$numHits,
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$regex,
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$wgUser->getName(),
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$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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return false;
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}
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/**
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* Filter callback function for URL whitelisting
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* @param string url 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 $wgCaptchaWhitelist;
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$source = wfMsgForContent( 'captcha-addurl-whitelist' );
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$whitelist = wfEmptyMsg( 'captcha-addurl-whitelist', $source )
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? false
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: $this->buildRegexes( explode( "\n", $source ) );
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$cwl = $wgCaptchaWhitelist !== false ? preg_match( $wgCaptchaWhitelist, $url ) : false;
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$wl = $whitelist !== false ? preg_match( $whitelist, $url ) : false;
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return !( $cwl || $wl );
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}
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/**
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* Build regex from whitelist
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* @param string lines from [[MediaWiki:Captcha-addurl-whitelist]]
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* @return string Regex or bool false if whitelist is empty
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* @access private
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*/
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function buildRegexes( $lines ) {
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# Code duplicated from the SpamBlacklist extension (r19197)
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# Strip comments and whitespace, then remove blanks
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$lines = array_filter( array_map( 'trim', preg_replace( '/#.*$/', '', $lines ) ) );
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# No lines, don't make a regex which will match everything
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if ( count( $lines ) == 0 ) {
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wfDebug( "No lines\n" );
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return false;
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} else {
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# Make regex
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# It's faster using the S modifier even though it will usually only be run once
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// $regex = 'http://+[a-z0-9_\-.]*(' . implode( '|', $lines ) . ')';
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// return '/' . str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $regex) ) . '/Si';
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$regexes = '';
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$regexStart = '/^https?:\/\/+[a-z0-9_\-.]*(';
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$regexEnd = ')/Si';
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$regexMax = 4096;
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$build = false;
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foreach ( $lines as $line ) {
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// FIXME: not very robust size check, but should work. :)
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if ( $build === false ) {
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$build = $line;
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} elseif ( strlen( $build ) + strlen( $line ) > $regexMax ) {
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$regexes .= $regexStart .
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str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $build ) ) .
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$regexEnd;
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$build = $line;
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} else {
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$build .= '|' . $line;
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}
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}
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if ( $build !== false ) {
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$regexes .= $regexStart .
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str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $build ) ) .
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$regexEnd;
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}
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return $regexes;
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}
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}
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/**
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* Load external links from the externallinks table
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*/
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function getLinksFromTracker( $title ) {
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$dbr = wfGetDB( DB_SLAVE );
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$id = $title->getArticleId(); // should be zero queries
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$res = $dbr->select( 'externallinks', array( 'el_to' ),
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array( 'el_from' => $id ), __METHOD__ );
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$links = array();
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foreach ( $res as $row ) {
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$links[] = $row->el_to;
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}
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return $links;
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}
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/**
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* Backend function for confirmEdit() and confirmEditAPI()
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* @return bool false if the CAPTCHA is rejected, true otherwise
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*/
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private function doConfirmEdit( $editPage, $newtext, $section, $merged = false ) {
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if ( $this->shouldCheck( $editPage, $newtext, $section, $merged ) ) {
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if ( $this->passCaptcha() ) {
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return true;
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} else {
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return false;
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}
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} else {
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wfDebug( "ConfirmEdit: no need to show captcha.\n" );
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return true;
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}
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}
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/**
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* The main callback run on edit attempts.
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* @param EditPage $editPage
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* @param string $newtext
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* @param string $section
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* @param bool $merged
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* @return bool true to continue saving, false to abort and show a captcha form
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*/
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function confirmEdit( $editPage, $newtext, $section, $merged = false ) {
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if ( defined( 'MW_API' ) ) {
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# API mode
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# The CAPTCHA was already checked and approved
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return true;
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}
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if ( !$this->doConfirmEdit( $editPage, $newtext, $section, $merged ) ) {
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$editPage->showEditForm( array( &$this, 'editCallback' ) );
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return false;
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}
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return true;
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}
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/**
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* A more efficient edit filter callback based on the text after section merging
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* @param EditPage $editPage
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* @param string $newtext
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*/
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function confirmEditMerged( $editPage, $newtext ) {
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return $this->confirmEdit( $editPage, $newtext, false, true );
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}
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function confirmEditAPI( $editPage, $newtext, &$resultArr ) {
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if ( !$this->doConfirmEdit( $editPage, $newtext, false, false ) ) {
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$this->addCaptchaAPI( $resultArr );
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return false;
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}
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return true;
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}
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/**
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* Hook for user creation form submissions.
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* @param User $u
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* @param string $message
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* @return bool true to continue, false to abort user creation
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*/
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function confirmUserCreate( $u, &$message ) {
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global $wgCaptchaTriggers, $wgUser;
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if ( $wgCaptchaTriggers['createaccount'] ) {
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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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if ( $this->isIPWhitelisted() )
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return true;
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$this->trigger = "new account '" . $u->getName() . "'";
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if ( !$this->passCaptcha() ) {
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$message = wfMsg( 'captcha-createaccount-fail' );
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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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/**
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* Hook for user login form submissions.
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* @param User $u
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* @param string $message
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* @return bool true to continue, false to abort user creation
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*/
|
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function confirmUserLogin( $u, $pass, &$retval ) {
|
||
if ( $this->isBadLoginTriggered() ) {
|
||
if ( $this->isIPWhitelisted() )
|
||
return true;
|
||
|
||
$this->trigger = "post-badlogin login '" . $u->getName() . "'";
|
||
if ( !$this->passCaptcha() ) {
|
||
// 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 = wfMsg( 'captcha-disabledinapi' );
|
||
return false;
|
||
}
|
||
$this->trigger = "{$wgUser->getName()} sending email";
|
||
if ( !$this->passCaptcha() ) {
|
||
$error = wfMsg( 'captcha-sendemail-fail' );
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* 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() {
|
||
$info = $this->retrieveCaptcha();
|
||
if ( $info ) {
|
||
global $wgRequest;
|
||
if ( $this->keyMatch( $wgRequest->getVal( 'wpCaptchaWord' ), $info ) ) {
|
||
$this->log( "passed" );
|
||
$this->clearCaptcha( $info );
|
||
return true;
|
||
} else {
|
||
$this->clearCaptcha( $info );
|
||
$this->log( "bad form input" );
|
||
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() );
|
||
}
|
||
$this->storage->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 $this->storage->retrieve( $index );
|
||
}
|
||
|
||
/**
|
||
* Clear out existing captcha info from the session, to ensure
|
||
* it can't be reused.
|
||
*/
|
||
function clearCaptcha( $info ) {
|
||
$this->storage->clear( $info['index'] );
|
||
}
|
||
|
||
/**
|
||
* Retrieve the current version of the page or section being edited...
|
||
* @param EditPage $editPage
|
||
* @param string $section
|
||
* @return string
|
||
* @access private
|
||
*/
|
||
function loadText( $editPage, $section ) {
|
||
$rev = Revision::newFromTitle( $editPage->mTitle );
|
||
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 string $text
|
||
* @return array of strings
|
||
*/
|
||
function findLinks( &$editpage, $text ) {
|
||
global $wgParser, $wgUser;
|
||
|
||
$options = new ParserOptions();
|
||
$text = $wgParser->preSaveTransform( $text, $editpage->mTitle, $wgUser, $options );
|
||
$out = $wgParser->parse( $text, $editpage->mTitle, $options );
|
||
|
||
return array_keys( $out->getExternalLinks() );
|
||
}
|
||
|
||
/**
|
||
* Show a page explaining what this wacky thing is.
|
||
*/
|
||
function showHelp() {
|
||
global $wgOut;
|
||
$wgOut->setPageTitle( wfMsg( 'captchahelp-title' ) );
|
||
$wgOut->addWikiText( wfMsg( 'captchahelp-text' ) );
|
||
if ( $this->storage->cookiesNeeded() ) {
|
||
$wgOut->addWikiText( wfMsg( 'captchahelp-cookies-needed' ) );
|
||
}
|
||
}
|
||
}
|