I stumbled on this semi-surprising behavior today. My https://meta.wikimedia.org/wiki/Special:CentralAuth/BDavis_(WMF) staff account has the global-ipblock-exempt permission, but I was unable to attach by login at https://as.wikiquote.org. I received this error notice instead of the expected successful login:

Auto-creation of a local account failed:

Your IP address is in a range that has been blocked on all Wikimedia Foundation wikis.

The block was made by ‪Metawiki>Bsadowski1‬. The reason given is Open proxy/Webhost: See the help page if you are affected: Abused web host / VPS: .

Start of block: ১০:০৫, ২৭ ফেব্ৰুৱাৰী ২০২৩
Expiry of block: ১০:০৫, ২৭ ফেব্ৰুৱাৰী ২০২৫

Your current IP address is 2001:470:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX. The blocked range is 2001:470:0:0:0:0:0:0/32.

Please include all above details in any queries you make. If you believe you were blocked by mistake, you can find additional information and instructions in the No open proxies global policy. Otherwise, to discuss the block please post a request for review on Meta-Wiki. You could also send an email to the stewards VRT queue at stewards@wikimedia.org including all above details.

Per T330602: Special:CreateLocalAccount should comply with user's block-bypass permissions Special:CreateLocalAccount now does take ipblock exemptions into account, so you can ask a steward or meta admin to create your account.

Just support anonymous User objects with a name set ... Simple but scary.

I guess it's not that scary. What are the situations in which you have a named anonymous account?

• Before autocreation. Adding rights would fix this bug, doesn't otherwise seem problematic (the worst thing that can happen is that the account does / doesn't get autocreated when it shouldn't / should).
• During revision import (although I'm not sure the current implementation uses User objects at all). Permissions of the revision author don't matter.
• For global blocks. Again, the permissions of the block author don't really matter.

The potentially scary scenario would be the one where someone registers an unattached local account which unherits permissions from a different user's central account, maybe via a race condition in registration; but the extension should already handle such race conditions (the old and new names are blocked from creation for the entire duration of the rename). So I think we can go with the simple solution here.

The same situation can also arise during normal account creation, once T354928: Allow logging and possibility to enact mitigations for actions for IPs with negative IP reputation data is in place. And we could probably simplify CheckBlocksSecondaryAuthenticationProvider too.

Change #1017883 had a related patch set uploaded (by ArielGlenn; author: ArielGlenn):

[mediawiki/extensions/CentralAuth@master] look up global user rights for anon users with name set

https://gerrit.wikimedia.org/r/1017883

The above patch fails CI for three tests not in the Database group. All three call User::isAllowed() at some point, which now would require database access. Two tests are in ConfirmEdit and one is in core (DumpableObjectsTest). I could add al lthree to @group Database or I could mock out CentralAuthHooks and have the onUserGetRights method always return true in those tests, or maybe there's some better approach. Poking @Tgr for advice or a pointer.

The problem is that User::isRegistered() tries to load the user, and User::isItemLoaded( 'name' ) is always true if we tried to load the user, even if it's an anonymous user.

The simplest solution would be to use $user->mFrom === 'name' instead of $user->isItemLoaded( 'name' ) but that's one of those grandfathered-in public properties that we probably don't really want to be public. Or we could check whether the username is an IP address but that feels convoluted.

Maybe there should be something like a User::hasUsername() method which is true iff the user has a non-zero ID (after loading) or has been created from a username.

Change #1019731 had a related patch set uploaded (by ArielGlenn; author: ArielGlenn):

[mediawiki/core@master] add a tiny helper function to check if a User has a name set

https://gerrit.wikimedia.org/r/1019731

Change #993242 had a related patch set uploaded (by XtexChooser; author: XtexChooser):

[mediawiki/core@master] AuthManager: perform auto-creation as target user

https://gerrit.wikimedia.org/r/993242

Change #993242 merged by jenkins-bot:

[mediawiki/core@master] AuthManager: perform auto-creation as target user

https://gerrit.wikimedia.org/r/993242

Change #1019731 merged by jenkins-bot:

[mediawiki/core@master] add a tiny helper function to check if a User has a name set

https://gerrit.wikimedia.org/r/1019731

Change #1017883 merged by jenkins-bot:

[mediawiki/extensions/CentralAuth@master] look up global user rights also for anon users with name set

https://gerrit.wikimedia.org/r/1017883

Should go live with the train next week. Recommended Tech News notice:

When visiting a wiki where you don't have a local account yet, local rules such as edit filters can sometimes prevent your account from being created. Starting this week, MediaWiki takes your global rights into account when evaluating whether you can override such local rules.

Hey @bd808 are you in the position to check whether autocreate is now working for you from a blocked IP range, or did you work around this issue via stewards or whatnot?

Not for me on en wikivoyage and wikiversity. But seems working on most small wikis.

In T316303#9833454, @XtexChooser wrote:

Not for me on en wikivoyage and wikiversity. But seems working on most small wikis.

For those following along, see https://meta.wikimedia.org/wiki/Special:CentralAuth?target=XtexChooser for autocreate working on a number of wikis. Odd that it would selectively fail on en.wikivoyage/wikiversity though.
@XtexChooser What error message did you get? Did it resemble the one in T316303#9299843 or was there something at all different?

It was saying I am globally IP blocked. idk why but now everything is fine and I am able to autocreate accounts. I created a couple of local accounts and it worked fine. Thanks!

In T316303#9833451, @ArielGlenn wrote:

Hey @bd808 are you in the position to check whether autocreate is now working for you from a blocked IP range, or did you work around this issue via stewards or whatnot?

Attempting to login to https://kus.wikipedia.org/ using my BDavis (WMF) SUL account which is a member of the Global IP block exemptions group is actively returning an auto-creation failure in the same manner as T316303#9299843.

Auto-creation of a local account failed:

Your IP address is in a range that has been blocked on all Wikimedia Foundation wikis.

The block was made by ‪Metawiki>Bsadowski1‬. The reason given is Open proxy/Webhost: See the help page if you are affected: Abused web host / VPS: .

Start of block: 04:35, 27 Fulumfug/Nwadisatan' 2023
Expiry of block: 04:35, 27 Fulumfug/Nwadisatan' 2025

Your current IP address is 2001:470:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX. The blocked range is 2001:470:0:0:0:0:0:0/32.

I tried this from the command line and it seemed to work fine:

tgr@mwmaint1002:~$ mwscript shell.php bewwiki
> $u = MW::user('BDavis (WMF)')
= MediaWiki\User\User {#5986
    +mId: 0,
  ...
> RequestContext::getMain()->getRequest()->setIP(\Wikimedia\IPUtils::canonicalize('2001:470:1:1:1:1:1:1'))
= null
> (string)MW::srv()->getAuthManager()->autoCreateUser($u, MediaWiki\Auth\AuthManager::AUTOCREATE_SOURCE_SESSION, false, true, $u)
= "<OK, no errors detected, no value set>"

so maybe it's some other permission check during login that fails?

rMW50dd99eefb38: AuthManager: perform auto-creation as target user should probably have updated the autocreation call in Setup.php, not the one in AuthManager. Passing a named user object through the entire login process seems hard, and in any case, there is no reason to force the user to manually log in.

There are still scenarios where autocreation would occur during login but not during setup, but those are much more rare.

(btw I did autocreate BDavis_(WMF)@kuswiki in the process of testing. You are very close to running out of wikis to test on.)

oops thanks for bd808's test, I found that I also could not auto-create on kus WP, getting the same global IP blocked error.
Maybe this task should remain open and unresolved?

Change #1040816 had a related patch set uploaded (by Gergő Tisza; author: Gergő Tisza):

[mediawiki/core@master] AuthManager: Perform auto-creation as target user in Setup.php also

https://gerrit.wikimedia.org/r/1040816

Possibly related: T366858: AbuseFilter does not report user_group or user_name when CreateLocalAccount is performed

Change #1040816 merged by jenkins-bot:

[mediawiki/core@master] AuthManager: Perform auto-creation as target user in Setup.php also

https://gerrit.wikimedia.org/r/1040816

There are three relevant autocreation scenarios on Wikimedia wikis:

1. autocreation from the session provider in Setup.php, when there is a valid central session cookie but no local session cookie (e.g. you are visiting ab.wikipedia.org while already logged in to en.wikipedia.org)
2. autocreation from the primary authentication provider after a successful login
3. autocreation from Special:CentralAutoLogin/setCookies on successful autologin or edge login

(There's also autocreation on loginwiki via Special:CentralLogin right after registration, and forced autocreation by another user via special page or script, but the user's global rights are non-existent or irrelevant in those scenarios.)

The first should be fixed by the last patch. The second would probably take a lot of fiddling to fix because there are a ton of permission checks in AuthManager and SpecialUserlogin and we'd need to ensure every single one of those uses an anonymous account with a name set. But this scenario will probably go away anyway after T348388. That leaves central autologin, which seems easy to fix.

Change #1048889 had a related patch set uploaded (by Gergő Tisza; author: Gergő Tisza):

[mediawiki/extensions/CentralAuth@master] SpecialCentralAutoLogin: Set performer on autocreate

https://gerrit.wikimedia.org/r/1048889

Change #1048889 merged by jenkins-bot:

[mediawiki/extensions/CentralAuth@master] SpecialCentralAutoLogin: Set performer on autocreate

https://gerrit.wikimedia.org/r/1048889

I think this is as much as we want to do for now so feel free to re-test. Proper logins still won't work but autologin & co. should.

In T316303#9934147, @Tgr wrote:

I think this is as much as we want to do for now so feel free to re-test. Proper logins still won't work but autologin & co. should.

Running https://meta.wikimedia.org/wiki/User:Krinkle/Tools/Global_SUL has been my intro to finding this problem in the past. Today when I first ran it it said:

Made 6 auto-create attempts.

    ka.wikisource.org
    kaa.wiktionary.org
    ms.wikisource.org
    my.wikisource.org
    wikitech.wikimedia.org
    labtestwikitech.wikimedia.org

(The 2 wikitech items are always there because they are not actually SUL wikis but are in the list of wikis used by the script.)

When I visited ka.wikisource.org and kaa.wiktionary.org after this I saw both perform the autologin dance successfully matching @trg's prediction. A second run of the script shows ms.wikisource.org and my.wikisource.org still unattached, but I assume I can attach them by merely visiting with an active SUL session. This is much improved from the state described in T316303#9299843 back in November. Thanks for your work everyone!

rECAU8c8e144381e8: CentralAuthIdLookup: Treat central users without local accounts as owned solved the underlying problem (or re-solved it in a more robust way than the patch here) so we just need to check if PermissionManager and/or CentralAuth's UserGetRights handler have any hardcoded user existence checks that need adjustment, I think.