3
class ConfirmEditHooks {
4
static function getInstance() {
5
global $wgCaptcha, $wgCaptchaClass, $wgExtensionMessagesFiles;
9
wfLoadExtensionMessages( 'ConfirmEdit' );
10
if ( isset( $wgExtensionMessagesFiles[$wgCaptchaClass] ) ) {
11
wfLoadExtensionMessages( $wgCaptchaClass );
13
$wgCaptcha = new $wgCaptchaClass;
18
static function confirmEdit( &$editPage, $newtext, $section ) {
19
return self::getInstance()->confirmEdit( $editPage, $newtext, $section );
22
static function confirmEditMerged( &$editPage, $newtext ) {
23
return self::getInstance()->confirmEditMerged( $editPage, $newtext );
26
static function confirmEditAPI( &$editPage, $newtext, &$resultArr ) {
27
return self::getInstance()->confirmEditAPI( $editPage, $newtext, $resultArr );
30
static function injectUserCreate( &$template ) {
31
return self::getInstance()->injectUserCreate( $template );
34
static function confirmUserCreate( $u, &$message ) {
35
return self::getInstance()->confirmUserCreate( $u, $message );
38
static function triggerUserLogin( $user, $password, $retval ) {
39
return self::getInstance()->triggerUserLogin( $user, $password, $retval );
42
static function injectUserLogin( &$template ) {
43
return self::getInstance()->injectUserLogin( $template );
46
static function confirmUserLogin( $u, $pass, &$retval ) {
47
return self::getInstance()->confirmUserLogin( $u, $pass, $retval );
51
class CaptchaSpecialPage extends UnlistedSpecialPage {
52
function execute( $par ) {
54
$instance = ConfirmEditHooks::getInstance();
57
if( method_exists($instance,'showImage') )
58
return $instance->showImage();
61
return $instance->showHelp();
68
function SimpleCaptcha() {
69
global $wgCaptchaStorageClass;
70
$this->storage = new $wgCaptchaStorageClass;
73
function getCaptcha() {
76
$op = mt_rand(0, 1) ? '+' : '-';
79
$answer = ($op == '+') ? ($a + $b) : ($a - $b);
80
return array('question' => $test, 'answer' => $answer);
83
function addCaptchaAPI(&$resultArr) {
84
$captcha = $this->getCaptcha();
85
$index = $this->storeCaptcha( $captcha );
86
$resultArr['captcha']['type'] = 'simple';
87
$resultArr['captcha']['mime'] = 'text/plain';
88
$resultArr['captcha']['id'] = $index;
89
$resultArr['captcha']['question'] = $captcha['question'];
93
* Insert a captcha prompt into the edit form.
94
* This sample implementation generates a simple arithmetic operation;
95
* it would be easy to defeat by machine.
102
$captcha = $this->getCaptcha();
103
$index = $this->storeCaptcha( $captcha );
105
return "<p><label for=\"wpCaptchaWord\">{$captcha['question']}</label> = " .
106
Xml::element( 'input', array(
107
'name' => 'wpCaptchaWord',
108
'id' => 'wpCaptchaWord',
109
'tabindex' => 1 ) ) . // tab in before the edit textarea
111
Xml::element( 'input', array(
113
'name' => 'wpCaptchaId',
114
'id' => 'wpCaptchaId',
115
'value' => $index ) );
119
* Insert the captcha prompt into an edit form.
120
* @param OutputPage $out
122
function editCallback( &$out ) {
123
$out->addWikiText( $this->getMessage( $this->action ) );
124
$out->addHTML( $this->getForm() );
128
* Show a message asking the user to enter a captcha on edit
129
* The result will be treated as wiki text
131
* @param $action Action being performed
134
function getMessage( $action ) {
135
$name = 'captcha-' . $action;
136
$text = wfMsg( $name );
137
# Obtain a more tailored message, if possible, otherwise, fall back to
138
# the default for edits
139
return wfEmptyMsg( $name, $text ) ? wfMsg( 'captcha-edit' ) : $text;
144
* @fixme if multiple thingies insert a header, could break
145
* @param SimpleTemplate $template
146
* @return bool true to keep running callbacks
148
function injectUserCreate( &$template ) {
149
global $wgCaptchaTriggers, $wgOut, $wgUser;
150
if( $wgCaptchaTriggers['createaccount'] ) {
151
if( $wgUser->isAllowed( 'skipcaptcha' ) ) {
152
wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
155
$template->set( 'header',
156
"<div class='captcha'>" .
157
$wgOut->parse( $this->getMessage( 'createaccount' ) ) .
165
* Inject a captcha into the user login form after a failed
166
* password attempt as a speedbump for mass attacks.
167
* @fixme if multiple thingies insert a header, could break
168
* @param SimpleTemplate $template
169
* @return bool true to keep running callbacks
171
function injectUserLogin( &$template ) {
172
if( $this->isBadLoginTriggered() ) {
174
$template->set( 'header',
175
"<div class='captcha'>" .
176
$wgOut->parse( $this->getMessage( 'badlogin' ) ) .
184
* When a bad login attempt is made, increment an expiring counter
185
* in the memcache cloud. Later checks for this may trigger a
186
* captcha display to prevent too many hits from the same place.
188
* @param string $password
189
* @param int $retval authentication return value
190
* @return bool true to keep running callbacks
192
function triggerUserLogin( $user, $password, $retval ) {
193
global $wgCaptchaTriggers, $wgCaptchaBadLoginExpiration, $wgMemc;
194
if( $retval == LoginForm::WRONG_PASS && $wgCaptchaTriggers['badlogin'] ) {
195
$key = $this->badLoginKey();
196
$count = $wgMemc->get( $key );
198
$wgMemc->add( $key, 0, $wgCaptchaBadLoginExpiration );
200
$count = $wgMemc->incr( $key );
206
* Check if a bad login has already been registered for this
207
* IP address. If so, require a captcha.
211
function isBadLoginTriggered() {
212
global $wgMemc, $wgCaptchaBadLoginAttempts;
213
return intval( $wgMemc->get( $this->badLoginKey() ) ) >= $wgCaptchaBadLoginAttempts;
217
* Internal cache key for badlogin checks.
221
function badLoginKey() {
222
return wfMemcKey( 'captcha', 'badlogin', 'ip', wfGetIP() );
226
* Check if the submitted form matches the captcha session data provided
227
* by the plugin when the form was generated.
231
* @param string $answer
235
function keyMatch( $answer, $info ) {
236
return $answer == $info['answer'];
239
// ----------------------------------
242
* @param EditPage $editPage
243
* @param string $action (edit/create/addurl...)
244
* @return bool true if action triggers captcha on editPage's namespace
246
function captchaTriggers( &$editPage, $action) {
247
global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
248
//Special config for this NS?
249
if (isset( $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action] ) )
250
return $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action];
252
return ( !empty( $wgCaptchaTriggers[$action] ) ); //Default
257
* @param EditPage $editPage
258
* @param string $newtext
259
* @param string $section
260
* @return bool true if the captcha should run
262
function shouldCheck( &$editPage, $newtext, $section, $merged = false ) {
264
$title = $editPage->mArticle->getTitle();
267
if( $wgUser->isAllowed( 'skipcaptcha' ) ) {
268
wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
271
global $wgCaptchaWhitelistIP;
272
if( !empty( $wgCaptchaWhitelistIP ) ) {
274
foreach ( $wgCaptchaWhitelistIP as $range ) {
275
if ( IP::isInRange( $ip, $range ) ) {
282
global $wgEmailAuthentication, $ceAllowConfirmedEmail;
283
if( $wgEmailAuthentication && $ceAllowConfirmedEmail &&
284
$wgUser->isEmailConfirmed() ) {
285
wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
289
if( $this->captchaTriggers( $editPage, 'edit' ) ) {
290
// Check on all edits
292
$this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
294
$title->getPrefixedText() );
295
$this->action = 'edit';
296
wfDebug( "ConfirmEdit: checking all edits...\n" );
300
if( $this->captchaTriggers( $editPage, 'create' ) && !$editPage->mTitle->exists() ) {
301
//Check if creating a page
303
$this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
305
$title->getPrefixedText() );
306
$this->action = 'create';
307
wfDebug( "ConfirmEdit: checking on page creation...\n" );
311
if( $this->captchaTriggers( $editPage, 'addurl' ) ) {
312
// Only check edits that add URLs
314
// Get links from the database
315
$oldLinks = $this->getLinksFromTracker( $title );
316
// Share a parse operation with Article::doEdit()
317
$editInfo = $editPage->mArticle->prepareTextForEdit( $newtext );
318
$newLinks = array_keys( $editInfo->output->getExternalLinks() );
320
// Get link changes in the slowest way known to man
321
$oldtext = $this->loadText( $editPage, $section );
322
$oldLinks = $this->findLinks( $editPage, $oldtext );
323
$newLinks = $this->findLinks( $editPage, $newtext );
326
$unknownLinks = array_filter( $newLinks, array( &$this, 'filterLink' ) );
327
$addedLinks = array_diff( $unknownLinks, $oldLinks );
328
$numLinks = count( $addedLinks );
330
if( $numLinks > 0 ) {
332
$this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
335
$title->getPrefixedText(),
336
implode( ", ", $addedLinks ) );
337
$this->action = 'addurl';
342
global $wgCaptchaRegexes;
343
if( !empty( $wgCaptchaRegexes ) ) {
344
// Custom regex checks
345
$oldtext = $this->loadText( $editPage, $section );
347
foreach( $wgCaptchaRegexes as $regex ) {
348
$newMatches = array();
349
if( preg_match_all( $regex, $newtext, $newMatches ) ) {
350
$oldMatches = array();
351
preg_match_all( $regex, $oldtext, $oldMatches );
353
$addedMatches = array_diff( $newMatches[0], $oldMatches[0] );
355
$numHits = count( $addedMatches );
358
$this->trigger = sprintf( "%dx %s at [[%s]]: %s",
362
$title->getPrefixedText(),
363
implode( ", ", $addedMatches ) );
364
$this->action = 'edit';
375
* Filter callback function for URL whitelisting
376
* @param string url to check
377
* @return bool true if unknown, false if whitelisted
380
function filterLink( $url ) {
381
global $wgCaptchaWhitelist;
382
$source = wfMsgForContent( 'captcha-addurl-whitelist' );
384
$whitelist = wfEmptyMsg( 'captcha-addurl-whitelist', $source )
386
: $this->buildRegexes( explode( "\n", $source ) );
388
$cwl = $wgCaptchaWhitelist !== false ? preg_match( $wgCaptchaWhitelist, $url ) : false;
389
$wl = $whitelist !== false ? preg_match( $whitelist, $url ) : false;
391
return !( $cwl || $wl );
395
* Build regex from whitelist
396
* @param string lines from [[MediaWiki:Captcha-addurl-whitelist]]
397
* @return string Regex or bool false if whitelist is empty
400
function buildRegexes( $lines ) {
401
# Code duplicated from the SpamBlacklist extension (r19197)
403
# Strip comments and whitespace, then remove blanks
404
$lines = array_filter( array_map( 'trim', preg_replace( '/#.*$/', '', $lines ) ) );
406
# No lines, don't make a regex which will match everything
407
if ( count( $lines ) == 0 ) {
408
wfDebug( "No lines\n" );
412
# It's faster using the S modifier even though it will usually only be run once
413
//$regex = 'http://+[a-z0-9_\-.]*(' . implode( '|', $lines ) . ')';
414
//return '/' . str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $regex) ) . '/Si';
416
$regexStart = '/^https?:\/\/+[a-z0-9_\-.]*(';
420
foreach( $lines as $line ) {
421
// FIXME: not very robust size check, but should work. :)
422
if( $build === false ) {
424
} elseif( strlen( $build ) + strlen( $line ) > $regexMax ) {
425
$regexes .= $regexStart .
426
str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
430
$build .= '|' . $line;
433
if( $build !== false ) {
434
$regexes .= $regexStart .
435
str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
443
* Load external links from the externallinks table
445
function getLinksFromTracker( $title ) {
446
$dbr =& wfGetDB( DB_SLAVE );
447
$id = $title->getArticleId(); // should be zero queries
448
$res = $dbr->select( 'externallinks', array( 'el_to' ),
449
array( 'el_from' => $id ), __METHOD__ );
451
while ( $row = $dbr->fetchObject( $res ) ) {
452
$links[] = $row->el_to;
458
* Backend function for confirmEdit() and confirmEditAPI()
459
* @return bool false if the CAPTCHA is rejected, true otherwise
461
private function doConfirmEdit( &$editPage, $newtext, $section, $merged = false ) {
462
if( $this->shouldCheck( $editPage, $newtext, $section, $merged ) ) {
463
if( $this->passCaptcha() ) {
469
wfDebug( "ConfirmEdit: no need to show captcha.\n" );
475
* The main callback run on edit attempts.
476
* @param EditPage $editPage
477
* @param string $newtext
478
* @param string $section
479
* @param bool $merged
480
* @return bool true to continue saving, false to abort and show a captcha form
482
function confirmEdit( &$editPage, $newtext, $section, $merged = false ) {
484
if( is_null( $wgTitle ) ) {
486
# The CAPTCHA was already checked and approved
489
if( !$this->doConfirmEdit( $editPage, $newtext, $section, $merged ) ) {
490
$editPage->showEditForm( array( &$this, 'editCallback' ) );
497
* A more efficient edit filter callback based on the text after section merging
498
* @param EditPage $editPage
499
* @param string $newtext
501
function confirmEditMerged( &$editPage, $newtext ) {
502
return $this->confirmEdit( $editPage, $newtext, false, true );
506
function confirmEditAPI( &$editPage, $newtext, &$resultArr) {
507
if( !$this->doConfirmEdit( $editPage, $newtext, false, false ) ) {
508
$this->addCaptchaAPI($resultArr);
515
* Hook for user creation form submissions.
517
* @param string $message
518
* @return bool true to continue, false to abort user creation
520
function confirmUserCreate( $u, &$message ) {
521
global $wgCaptchaTriggers, $wgUser;
522
if( $wgCaptchaTriggers['createaccount'] ) {
523
if( $wgUser->isAllowed( 'skipcaptcha' ) ) {
524
wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
527
$this->trigger = "new account '" . $u->getName() . "'";
528
if( !$this->passCaptcha() ) {
529
$message = wfMsg( 'captcha-createaccount-fail' );
537
* Hook for user login form submissions.
539
* @param string $message
540
* @return bool true to continue, false to abort user creation
542
function confirmUserLogin( $u, $pass, &$retval ) {
543
if( $this->isBadLoginTriggered() ) {
544
$this->trigger = "post-badlogin login '" . $u->getName() . "'";
545
if( !$this->passCaptcha() ) {
546
$message = wfMsg( 'captcha-badlogin-fail' );
547
// Emulate a bad-password return to confuse the shit out of attackers
548
$retval = LoginForm::WRONG_PASS;
556
* Given a required captcha run, test form input for correct
557
* input on the open session.
558
* @return bool if passed, false if failed or new session
560
function passCaptcha() {
561
$info = $this->retrieveCaptcha();
564
if( $this->keyMatch( $wgRequest->getVal('wpCaptchaWord'), $info ) ) {
565
$this->log( "passed" );
566
$this->clearCaptcha( $info );
569
$this->clearCaptcha( $info );
570
$this->log( "bad form input" );
574
$this->log( "new captcha session" );
580
* Log the status and any triggering info for debugging or statistics
581
* @param string $message
583
function log( $message ) {
584
wfDebugLog( 'captcha', 'ConfirmEdit: ' . $message . '; ' . $this->trigger );
588
* Generate a captcha session ID and save the info in PHP's session storage.
589
* (Requires the user to have cookies enabled to get through the captcha.)
591
* A random ID is used so legit users can make edits in multiple tabs or
592
* windows without being unnecessarily hobbled by a serial order requirement.
593
* Pass the returned id value into the edit form as wpCaptchaId.
595
* @param array $info data to store
596
* @return string captcha ID key
598
function storeCaptcha( $info ) {
599
if( !isset( $info['index'] ) ) {
600
// Assign random index if we're not udpating
601
$info['index'] = strval( mt_rand() );
603
$this->storage->store( $info['index'], $info );
604
return $info['index'];
608
* Fetch this session's captcha info.
609
* @return mixed array of info, or false if missing
611
function retrieveCaptcha() {
613
$index = $wgRequest->getVal( 'wpCaptchaId' );
614
return $this->storage->retrieve( $index );
618
* Clear out existing captcha info from the session, to ensure
619
* it can't be reused.
621
function clearCaptcha( $info ) {
622
$this->storage->clear( $info['index'] );
626
* Retrieve the current version of the page or section being edited...
627
* @param EditPage $editPage
628
* @param string $section
632
function loadText( $editPage, $section ) {
633
$rev = Revision::newFromTitle( $editPage->mTitle );
634
if( is_null( $rev ) ) {
637
$text = $rev->getText();
638
if( $section != '' ) {
639
return Article::getSection( $text, $section );
647
* Extract a list of all recognized HTTP links in the text.
648
* @param string $text
649
* @return array of strings
651
function findLinks( &$editpage, $text ) {
652
global $wgParser, $wgUser;
654
$options = new ParserOptions();
655
$text = $wgParser->preSaveTransform( $text, $editpage->mTitle, $wgUser, $options );
656
$out = $wgParser->parse( $text, $editpage->mTitle, $options );
658
return array_keys( $out->getExternalLinks() );
662
* Show a page explaining what this wacky thing is.
664
function showHelp() {
665
global $wgOut, $ceAllowConfirmedEmail;
666
$wgOut->setPageTitle( wfMsg( 'captchahelp-title' ) );
667
$wgOut->addWikiText( wfMsg( 'captchahelp-text' ) );
668
if ( $this->storage->cookiesNeeded() ) {
669
$wgOut->addWikiText( wfMsg( 'captchahelp-cookies-needed' ) );
675
class CaptchaSessionStore {
676
function store( $index, $info ) {
677
$_SESSION['captcha' . $info['index']] = $info;
680
function retrieve( $index ) {
681
if( isset( $_SESSION['captcha' . $index] ) ) {
682
return $_SESSION['captcha' . $index];
688
function clear( $index ) {
689
unset( $_SESSION['captcha' . $index] );
692
function cookiesNeeded() {
697
class CaptchaCacheStore {
698
function store( $index, $info ) {
699
global $wgMemc, $wgCaptchaSessionExpiration;
700
$wgMemc->set( wfMemcKey( 'captcha', $index ), $info,
701
$wgCaptchaSessionExpiration );
704
function retrieve( $index ) {
706
$info = $wgMemc->get( wfMemcKey( 'captcha', $index ) );
714
function clear( $index ) {
716
$wgMemc->delete( wfMemcKey( 'captcha', $index ) );
719
function cookiesNeeded() {
added
removed
include/ConfirmEdit_body.php
