Extension:ConfirmEdit

This page is a translated version of the page Extension:ConfirmEdit and the translation is 80% complete.
Diese Erweiterung ist üblicherweise in MediaWiki 1.18 und darüber enthalten. Daher muss sie nicht erneut heruntergeladen werden. Allerdings müssen die folgenden Anweisungen trotzdem beachtet werden.
MediaWiki-Erweiterungen
OOjs UI icon advanced-invert.svg
ConfirmEdit
Freigabestatus: stabil
MediaWiki Extension ConfirmEdit.png
Einbindung Seitenaktivität
Beschreibung Fügt CAPTCHAs für das Speichern von Seiten und andere Benutzeraktionen hinzu
Autor(en)
  • Brion Vibber
  • Florian Schmidt
  • Sam Reed
Letzte Version 1.6.0 (Kontinuierliche Aktualisierungen)
Kompatibilitätspolitik Snapshots releases along with MediaWiki. Master is not backward compatible.
MediaWiki 1.31+
PHP 5.5.9+
Lizenz GNU General Public License 2.0 oder neuer
Herunterladen
  • $wgAllowConfirmedEmail
  • $wgCaptchaBadLoginExpiration
  • $wgCaptchaTriggersOnNamespace
  • $wgCaptchaStorageClass
  • $wgCaptchaSessionExpiration
  • $wgCaptchaRegexes
  • $wgCaptchaWhitelistIP
  • $wgCaptchaWhitelist
  • $wgCaptchaTriggers
  • $wgCaptchaBadLoginPerUserAttempts
  • $wgCaptchaBadLoginPerUserExpiration
  • $wgCaptcha
  • $wgCaptchaBadLoginAttempts
  • skipcaptcha
Übersetze die ConfirmEdit-Erweiterung, wenn sie auf translatewiki.net verfügbar ist

Prüfe die Benutzungs- und Versionsmatrix.

Vagrant-Rolle confirmedit
Probleme Offene Aufgaben · Einen Fehler melden

Mit der Erweiterung ConfirmEdit lassen sich verschiedene CAPTCHA-Techniken verwenden, um spambots und andere automatisierte Tools an der Bearbeitung deines Wikis zu hindern und um automatisierte Anmeldeversuche zu vereiteln, die versuchen, Passwörter zu erraten.

ConfirmEdit kommt mit mehreren Techniken/Modulen zur Captcha-Generierung.

Modul Beschreibung Effektivität beim Stoppen von Spam
SimpleCaptcha Benutzer müssen eine wirklich einfache Rechenaufgabe lösen. Niedrig
FancyCaptcha Die Benutzer müssen eine Reihe von Buchstaben/Zahlen identifizieren, die in verfremdeter Form angezeigt werden. Niedrig
MathCaptcha Die Benutzer müssen eine Rechenaufgabe lösen, die als Bild angezeigt wird. Niedrig
QuestyCaptcha Die Benutzer müssen eine Frage aus einer Reihe von Fragen beantworten, die von dem/den Administrator(en) festgelegt wurden. Sehr hoch, wenn nicht gecrackt
ReCaptcha NoCaptcha Dem Benutzer wird eine auf JavaScript basierende Kontrolle der menschlichen Fähigkeiten präsentiert. Wenn die Prüfung nicht bestanden wird, wird ein Puzzle präsentiert. Niedrig bis mittel
hCaptcha Ähnlich wie ReCaptcha, aber es ist vermutlich effektiver als ReCaptcha wegen seines anderen Ansatzes für barrierefreie Captchas. Unbekannt

Einige dieser Module erfordern zusätzliche Einstellungen:

  • MathCaptcha erfordert sowohl das Vorhandensein von TeX als auch die Erweiterung Math, für Versionen von MediaWiki nach 1.17
  • FancyCaptcha erfordert die Ausführung eines vorherigen Setup-Skripts in Python

Nachteile

CAPTCHAs reduzieren die Barrierefreiheit und verursachen bei menschlichen Benutzern eine gewisse Unannehmlichkeit.

Sie sind auch gegen Bots nicht zu 100% effektiv. Sie werden dein Wiki nicht vor Spammern schützen können, die bereit und in der Lage sind, menschliche Fähigkeiten zu nutzen, um die CAPTCHAs zu überwinden. Du könntest ConfirmEdit in Kombination mit anderen Antispam-Funktionen verwenden. Regardless of the solution you use, if you have a publicly-editable wiki it's important to keep monitoring the "Recent changes" page.

Installation

ConfirmEdit may not work if used with a MediaWiki version different from the one specified when downloading via the "Extension distributor".
  • Wird Vagrant benutzt, ist mit vagrant roles enable confirmedit --provision zu installieren
Manuelle Installation
  • Die Erweiterung herunterladen und die Datei(en) in ein Verzeichnis namens ConfirmEdit im Ordner extensions/ ablegen.
  • Folgenden Code am Ende der LocalSettings.php hinzufügen:
    wfLoadExtension( 'ConfirmEdit' );
    
  • Enable the CAPTCHA type which should be used
  • Configure as needed
  •   Erledigt – Zu Special:Version in dem Wiki (bei Einstellung auf deutsch nach Spezial:Version) navigieren, um die erfolgreiche Installierung der Erweiterung zu überprüfen.

CAPTCHA-Typen

There are numerous different CAPTCHA types included with ConfirmEdit.

QuestyCaptcha

This module presents a question and the user supplies the answer. You provide the questions in the configuration. This module has proven to offer a strong mechanism against spam bots; it also should have the advantage of a better accessibility, as textual questions can be read by text-to-speech software allowing visually impaired users (but not bots) to answer correctly.

Add the following to LocalSettings.php to enable this CAPTCHA, editing the Q&A:

// If your MediaWiki version is 1.25 or higher, use this line:
wfLoadExtensions([ 'ConfirmEdit', 'ConfirmEdit/QuestyCaptcha' ]);

// Else use these lines:
require_once "$IP/extensions/ConfirmEdit/ConfirmEdit.php";
require_once "$IP/extensions/ConfirmEdit/QuestyCaptcha.php";

// Add your questions in LocalSettings.php using this format:
$wgCaptchaQuestions = [
	'What is the capital of France?' => 'Paris',
	'What is the capital of Spain' => 'MADRID', // Answers are case insensitive
	'What is the name of this wiki?' => $wgSitename, // You can use variables
	'How many fingers does a hand have?' => [ 5, 'five' ], // A question may have many answers
];

You can also configure ConfirmEdit's triggers and other options. If the Captcha does not appear, add the following below the extension code. By setting any individual option to "true", the Captcha will be triggered when performing the named action. Otherwise you can write "false" to disable Captcha for this action.

$wgMainCacheType    = CACHE_ANYTHING;
$wgCaptchaTriggers['edit']          = true;
$wgCaptchaTriggers['create']        = true;
$wgCaptchaTriggers['createtalk']    = true;
$wgCaptchaTriggers['addurl']        = true;
$wgCaptchaTriggers['createaccount'] = true;
$wgCaptchaTriggers['badlogin']      = true;

It will randomly choose a question from those supplied. The minimum is one.

  • QuestyCaptcha is case-insensitive. If the answer is "Paris" and the user writes "paris", or if the answer is "paris" and the user writes "Paris", it will still work.
  • If the answer has a special character like "ó", you may write an answer with "ó" and another without, just in case. For example if the answer is "canción" you can use [ 'cancion', 'canción' ] in case the user writes "cancion".
  • The answer must be easy to guess for a human interested in your wiki, but not by an automatic program. Ideally, it should not be contained in the text of the question; you can try and edit the captcha help messages[1] and provide the solution to the captcha response there.
  • Just change the questions when/if they start proving ineffective; this may never happen if your wiki is not specifically targeted.
  • Don't ever reuse questions already used by you or others in the past: spambots are known to remember a question and its answer forever once they broke it.
  • You can even dynamically generate questy captchas in the configuration. DO NOT use an exact copy of the dynamic questions from the link -- they've been cracked by spammers. However other dynamic questions in the style of the questions presented are highly effective.

ReCaptcha (NoCaptcha)

The ReCaptchaNoCaptcha module was introduced in the MediaWiki release 1.26; you can't use it in older versions of ConfirmEdit and MediaWiki.
  Warnung: ReCaptcha has been cracked by most spambots targeting wikis, mainly due to its accessible captcha alternative.


The new generation of ReCaptcha, called NoCaptcha, was introduced by Google back in December 2014[2] and reduces the need for humans to solve a CAPTCHA. Based on a user-side JavaScript (which can't be controlled by the user the administrator), reCaptcha tries to identify the site user as a human by analyzing their browsing behavior on the page. The user then has to click an "I'm not a robot" checkbox and (in the best case) doesn't have to do anything further to prove they're a human. However, in some cases, the user still has to solve a CAPTCHA image.

Note: ReCaptcha will not work with the VisualEditor.

This module implements the new ReCaptcha NoCaptcha solution in ConfirmEdit. You still need a public and a secret key (which you can retrieve from the ReCaptcha admin panel – change v2, v3 not work) and install the plugin with:

wfLoadExtensions([ 'ConfirmEdit', 'ConfirmEdit/ReCaptchaNoCaptcha' ]);
$wgCaptchaClass = 'ReCaptchaNoCaptcha';
$wgReCaptchaSiteKey = 'your public/site key here';
$wgReCaptchaSecretKey = 'your private key here';

There is an additional configuration option for this module, $wgReCaptchaSendRemoteIP (default: false), which, if set to true, sends the IP address of the current user to a server from Google while verifying the CAPTCHA. You can improve the privacy for your users if you keep this set to "false". However, remember, that this module adds a client side JavaScript code, directly loaded from a server from Google, which already can collect the IP address of the user (combined with other data, too) and can not be limited by a configuration option. This will only work on standard MediaWiki editor.

SimpleCaptcha (calculation)

  Warnung: This type is used by very few wikis outside WMF if any, probably because of scarce effectiveness.


 
a simple math question.

This is the default CAPTCHA. This module provides a simple addition or subtraction question for the user.

Add the following lines to LocalSettings.php in the root of your MediaWiki to enable this CAPTCHA:

$wgCaptchaClass = 'SimpleCaptcha';

Note that the display of a trivial maths problem as plaintext yields a captcha which can be trivially solved by automated means; as of 2012, sites using SimpleCaptcha are receiving significant amounts of spam and many automated registrations of spurious new accounts. Wikis currently using this as the default should therefore migrate to one of the other CAPTCHAs.

FancyCaptcha

  Warnung: This type is used by very few wikis outside WMF if any, probably because of scarce effectiveness.


 

This module displays a stylized image of a set of characters. Pillow must be installed in order to create the set of images initially, but isn't needed after that (can be installed with pip install Pillow in most environments).

  1. Add the following lines to LocalSettings.php in the root of your MediaWiki installation:
    MediaWiki version is 1.25 or newer:
    wfLoadExtensions([ 'ConfirmEdit', 'ConfirmEdit/FancyCaptcha' ]);
    $wgCaptchaClass = 'FancyCaptcha';
    MediaWiki version is older than 1.25:
    require_once "$IP/extensions/ConfirmEdit/ConfirmEdit.php";
    require_once "$IP/extensions/ConfirmEdit/FancyCaptcha.php";
    $wgCaptchaClass = 'FancyCaptcha';
  2. In LocalSettings.php, set the variable $wgCaptchaDirectory to the directory where you will store Captcha images. Below it set $wgCaptchaSecret to your passphrase.
  3. Create the images by running the following, where:
    • font is a path to some font, for instance AriBlk.TTF.
    • wordlist is a path to some word list, for instance /usr/share/dict/words. (Note: on Debian/Ubuntu, the 'wbritish' and 'wamerican' packages provide such lists. On Fedora, use the 'words' package).
    • key is the exact passphrase you set $wgCaptchaSecret to. Use quotes if necessary.
    • output is the path to where the images should be stored (defined in $wgCaptchaDirectory).
    • count is how many images to generate.
    python /path/to/captcha.py --font=<font> --wordlist=<wordlist> --key=<key> --output=<output> --count=<count>
    • An example, assuming you're in the extensions/ConfirmEdit directory (font location from Ubuntu 6.06, probably different on other operating systems):
    python captcha.py --font=/usr/share/fonts/truetype/freefont/FreeSans.ttf --wordlist=/usr/share/dict/words --key=FOO --output=../../../captcha --count=100
    • If you are not satisfied with the results of the words you've generated you can simply remove the images and create a new set. Comic_Sans_MS_Bold.ttf seems to generate relatively legible words, and you could also edit the last line of captcha.py to increase the font size from the default of 40.
  4. Put the images you get into captcha directory in your installation
  5. Edit your wiki's LocalSettings.php : specify full path to your captcha directory in $wgCaptchaDirectory and secret key you've been using while generating captures in $wgCaptchaSecret
$wgCaptchaDirectory = "/.php-data/my-wiki.org/wiki/captcha";
$wgCaptchaDirectoryLevels = 0; // Set this to a value greater than zero to break the images into subdirectories
$wgCaptchaSecret = "FOO"; // same value you used in --key option in captcha.py

See also wikitech:Generating CAPTCHAs for how Wikimedia Foundation does it.

How to avoid common problems running Python on Windows
  1. Install the most recent version of Pillow.
  2. Make the installation of Python on a short folder name. Like C:\Python\
  3. Create a folder like C:\Ex and place files CAPTCHA.py / FONT.ttf / LIST.txt into the folder.
  4. To execute easily, run the following example as a batch file:
C:\python\python.exe C:\Ex\CAPTCHA.py --font C:\Ex\FONT.ttf --wordlist C:\Ex\LIST.txt --key=YOURPASSWORD --output C:\Ex\ --count=20

MathCaptcha

  Warnung: This type is used by very few wikis outside WMF if any, probably because of scarce effectiveness.


This requires the Math extension to be installed. See also Extension:Math

This module generates an image using TeX to ask a basic math question.

Set the following to enable this CAPTCHA:

// Use this line ONLY if your MediaWiki version is 1.25 or newer:
wfLoadExtension( 'ConfirmEdit/MathCaptcha' );
// Use this line ONLY if your MediaWiki version is older than 1.25:
require_once "$IP/extensions/ConfirmEdit/MathCaptcha.php";
$wgCaptchaClass = 'MathCaptcha';

See the readme file in the math folder to install this captcha.

hCaptcha

MediaWiki Version:
1.35
Currently, only the master version or the version 1.35 of ConfirmEdit officially support hCaptcha. An unofficial backport is available for MediaWiki 1.31-1.34, but it is not official—use it at your own risk.

See https://www.hcaptcha.com/

The configuration is similar to ReCaptcha:

wfLoadExtensions([ 'ConfirmEdit', 'ConfirmEdit/hCaptcha' ]);
$wgHCaptchaSiteKey = 'your public/site key here';
$wgHCaptchaSecretKey = 'your private key here';

$wgHCaptchaSendRemoteIP is also available.

Konfiguration

ConfirmEdit introduces a 'skipcaptcha' permission type to wgGroupPermissions . This lets you set certain groups to never see CAPTCHAs. All of the following can be added to localsettings.php.

Defaults from ConfirmEdit.php:

$wgGroupPermissions['*'            ]['skipcaptcha'] = false;
$wgGroupPermissions['user'         ]['skipcaptcha'] = false;
$wgGroupPermissions['autoconfirmed']['skipcaptcha'] = false;
$wgGroupPermissions['bot'          ]['skipcaptcha'] = true; // registered bots
$wgGroupPermissions['sysop'        ]['skipcaptcha'] = true;

To skip captchas for users that confirmed their email, you need to set both:

$wgGroupPermissions['emailconfirmed']['skipcaptcha'] = true;
$ceAllowConfirmedEmail = true;

There are five "triggers" on which CAPTCHAs can be displayed:

  • 'edit' - triggered on every attempted page save
  • 'create' - triggered on page creation
  • 'addurl' - triggered on a page save that would add one or more URLs to the page
  • 'createaccount' - triggered on creation of a new account
  • 'badlogin' - triggered on the next login attempt after a failed one. Requires $wgMainCacheType to be set to something other than CACHE_NONE in your LocalSettings.php, if in doubt the following will always work. Note that badlogin does not trigger captchas on API login, but instead blocks them outright until $wgCaptchaBadLoginExpiration expires.
$wgMainCacheType = CACHE_ANYTHING;

The default values for these are:

$wgCaptchaTriggers['edit'] = false; 
$wgCaptchaTriggers['create'] = false; 
$wgCaptchaTriggers['addurl'] = true; 
$wgCaptchaTriggers['createaccount'] = true;
$wgCaptchaTriggers['badlogin'] = true;

The triggers edit, create and addurl can be configured per namespace using the $wgCaptchaTriggersOnNamespace setting. If there is no $wgCaptchaTriggersOnNamespace for the current namespace, the normal $wgCaptchaTriggers apply. So suppose that in addition to the above $wgCaptchaTriggers defaults we configure the following:

$wgCaptchaTriggersOnNamespace[NS_TALK]['addurl'] = false;
$wgCaptchaTriggersOnNamespace[NS_PROJECT]['edit'] = true;

Then the CAPTCHA will not trigger when adding URLs to a talk page, but on the other hand user will need to solve a CAPTCHA any time they try to edit a page in the project namespace, even if they aren't adding a link.

URL and IP whitelists

It is possible to define a whitelist of known "good" sites for which the CAPTCHA should not kick in, when the 'addurl' action is triggered.

Sysop users can do this by editing the system message page called [[MediaWiki:Captcha-addurl-whitelist]]. The expected format is a set of regex's one per line. Comments can be added with # prefix. You can see an example of this usage on OpenStreetMap.

This set of whitelist regexes can also be defined using the $wgCaptchaWhitelist config variable in LocalSettings.php, to keep the value(s) a secret.

Some other variables you can add to LocalSettings.php:

  • $wgCaptchaWhitelistIP - List of IP ranges to allow to skip the CAPTCHA (you can also use [[MediaWiki:Captcha-ip-whitelist]]; see below for details).
  • $ceAllowConfirmedEmail - Allow users who have confirmed their e-mail addresses to post URL links

These are described more thoroughly in the code comments

[[MediaWiki:Captcha-ip-whitelist]] can be used to change the whitelisted IP addresses and IP ranges on wiki. They should be separated by newlines. If any other character (apart from a valid IP address or range) is found on a line, it will be ignored but leading and trailing whitespace characters are allowed. For example, a line with only 127.0.0.1 is considered valid but #127.0.0.1 will be ignored.

Regular expressions

The global variable wgCaptchaRegexes accepts an array of regexes to be tested against the page text and will trigger the CAPTCHA in case of a match.

Wikimedia approach

For example, Wikimedia Foundation wikis use FancyCaptcha with a custom set of images and the default configuration, modified by what follows.

$wgGroupPermissions['autoconfirmed']['skipcaptcha'] = true;

This means only unregistered and newly registered users have to pass the CAPTCHA.

EmergencyCaptcha mode

Additionally the shortcut named $wmgEmergencyCaptcha is designed for use in a limited number of emergency situations, for instance in case of massive vandalism or spam attacks: it changes the default trigger values (see above) into the following:

$wgCaptchaTriggers['edit'] = true; 
$wgCaptchaTriggers['create'] = true;

So all anonymous and new users have to solve a CAPTCHA also before being able to save an edit or create a new page, in addition to the normal situation.

Rate-Limiting

With Gerrit change 182551, ConfirmEdit supports rate limiting for false CAPTCHA. For more information about $wgRateLimits and how to set it up, read Handbuch:$wgRateLimits , the action key is badcaptcha.

Namen der Autoren

The basic framework was designed largely by Brion Vibber, who also wrote the SimpleCaptcha and FancyCaptcha modules. The MathCaptcha module was written by Rob Church. The QuestyCaptcha module was written by Benjamin Lees. Additional maintenance work was done by Yaron Koren.

Anmerkungen

  1. MediaWiki:Questycaptchahelp-text, MediaWiki:Questycaptcha-edit, MediaWiki:Questycaptcha-addurl, MediaWiki:Questycaptcha-create and MediaWiki:Questycaptcha-createaccount.
  2. Google Blog Are you a robot? Introducing “No CAPTCHA reCAPTCHA” (December 3, 2014)

Siehe auch