Extension:GlobalBlocking

MediaWiki extensions manual

GlobalBlocking Release status: stable
Implementation	Special page , User identity , API , Database
Description	Allows IP addresses and accounts to be blocked on multiple wikis
Author(s)	Andrew Garrett, Trust and Safety Product Team, Dreamy Jazz
Compatibility policy	Snapshots releases along with MediaWiki. Master is not backward compatible.
MediaWiki	1.39 and later
Database changes	Yes
Virtual domain	virtual-globalblocking
Tables	globalblocks global_block_whitelist
License	GNU General Public License 2.0 or later
Download	Download extension Git [?]: Download Git master browse repository (GitHub) commit history repository contributors (GitHub) code review
Parameters $wgApplyGlobalBlocks $wgGlobalBlockingBlockXFF $wgGlobalBlockingCentralWiki $wgGlobalBlockRemoteReasonUrl $wgGlobalBlockingAllowedRanges $wgGlobalBlockingCIDRLimit
Added rights globalblock globalblock-whitelist globalblock-exempt
Hooks used CentralAuthInfoFields ContributionsToolLinks GetBlockErrorMessageKey GetLogTypesOnUser GetUserBlock LoadExtensionSchemaUpdates OtherBlockLogLink SpecialContributionsBeforeMainOutput UserIsBlockedGlobally UserMergeAccountFields
Hooks provided GlobalBlockingGetRetroactiveAutoblockIPs
Quarterly downloads	80 (Ranked 61st)
Public wikis using	1,015 (Ranked 250th)
Translate the GlobalBlocking extension if it is available at translatewiki.net
Vagrant role	globalblocking
Issues	Open tasks · Report a bug

The GlobalBlocking extension allows a user with the appropriate permissions to block an IP address or IP address range (but not accounts before MediaWiki 1.43) on all wikis in a group sharing the same globalblocking database. It is intended to be used for combating severe cross-wiki vandalism and spam.

Installation

• Download and move the extracted GlobalBlocking folder to your extensions/ directory.
  Developers and code contributors should install the extension from Git instead, using:cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/GlobalBlocking
• Add the following code at the bottom of your LocalSettings.php file:

  wfLoadExtension( 'GlobalBlocking' );
  

• You will also need to create a dedicated database for this extension to work. At a minimum (all wikis running on the same host), you need to create a local database for the global tables. Usually this database is named globalblocking, but you can choose a different name. For example, on WMF wikis this table is on a database named centralauth.
• Grant all database users that your wikis run as full permissions on the database created in the above step (at a minimum, SELECT, UPDATE, INSERT, DELETE).
• Do either of the following depending on the version of MediaWiki you are running:
  • If you run MediaWiki 1.42 or above, define the configuration $wgDatabaseVirtualDomains['virtual-globalblocking'] = 'globalblocking'; (replacing globalblocking with the name of the database created in the steps above). See Manual:$wgVirtualDomainsMapping for more detail on how this configuration value works.
  • If you run MediaWiki 1.41 or below, define the configuration $wgGlobalBlockingDatabase = 'dbname'; where dbname is replaced with the name of the database you created in the steps above. If you called your database globalblocking then you can skip this step.
• After creating the database, you should import the SQL from tables-generated-globalblocks.sql into the global blocking database.
• You also need to run update.php on each of your local databases, or otherwise import the SQL schema in tables-generated-global_block_whitelist.sql to them.
•  Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Configuration

Config variable	Description
$wgApplyGlobalBlocks	Whether to respect global blocks on this wiki. This is used so that global blocks can be set on one wiki, but not actually applied there (i.e. so people can contest them on that wiki).
$wgGlobalBlockingBlockXFF	The flag $wgGlobalBlockingBlockXFF, set to true by default, causes blocks to apply to all of the IP addresses in the X-Forwarded-For (XFF) header. Set this flag to false to disable this feature. For more details, see task T25343.
$wgGlobalBlockingCIDRLimit	Largest global rangeblocks allowed, set by CIDR prefix. The format is the same as $wgBlockCIDRLimit and the default values are /16 for IPv4 and /19 for IPv6, as with $wgBlockCIDRLimit.
$wgGlobalBlockingDatabase	MediaWiki version: ≤ 1.41 The name of the database used to store the globalblocks table. This table is on a different database because only one table is used for all wikis in a wiki farm.
$wgGlobalBlockRemoteReasonUrl	Full path to api.php to use to expand templates in block reasons.
$wgGlobalBlockingAllowedRanges	A list of ranges or IP addresses which are exempted from all global blocks which target the ranges or IP addresses. This exemption does not apply to global account blocks (even if the user is on an exempt range or IP address).
$wgGlobalBlockingCentralWiki	The ID of the central wiki where global blocks are performed. Used to provide a link to the global block log which is likely to have entries, instead of the local log which is unlikely to contain entries. If the value is false, then the local log is used.

API

Two API modules are provided, one to (un)block users, and another to view existing global blocks. They are documented at Extension:GlobalBlocking/API.

Usage

The following requires appropriate permissions, assigned by default to stewards, which by default can be added or removed by bureaucrats. To make a global block:

1. Go to Special:GlobalBlock.
2. Enter the target you want to block. This can be an account post MediaWiki 1.43, an IPv4 address or range up to $wgGlobalBlockingCIDRLimit (by default /16, and also /16 hardcoded before that variable was introduced), or any IPv6 address or range up to $wgGlobalBlockingCIDRLimit (by default /19; /4 before that variable was introduced).
3. You may decide you want to only block anonymous users, which can only be done for blocks on IPv4 or IPv6 addresses. To only block anonymous users, check the checkbox.
4. Submit the form. The target of the block is now globally blocked on your wikis that opt in to the global blocking. Account creation is blocked (even if you selected "anonymous users only": phab:T42190), and the blocked user cannot edit any associated user talk pages on any wiki affected and opted in to the global block. If Extension:AbuseFilter is installed, globally blocked IP addresses are prohibited from viewing the abuse log if the particular wiki is opted in to the block.

To remove a global block:

1. Go to Special:GlobalUnblock and click "Remove a global block".
2. Enter the target of the block you want to remove and the reason, and submit the form. The account, IP address, or IP range will no longer be globally blocked.

See also

• Combating spam
• Combating vandalism
• BulkBlock Extension — an extension that allows administrators to easily block multiple users at once on a MediaWiki website.