Hello users!

Thanks to help from the Prosody developers, I applied changes to the core Prosody code which fixes SNI. This in turn solves the issue with Google captcha returning an invalid response. Registrations now work once again! This time I’ll be sticking with Google captcha, as other solutions have allowed bots to register tens of thousands of accounts in a quick period of time.

The changes made to fix SNI were pushed to Prosody’s trunk branch, which contains unstable code. Rather than switching entirely to Prosody trunk, I applied the code from the trunk branch only to fix SNI. If you’re curious, the changes came from hg.prosody.im/trunk/rev/d4390c427a66 and hg.prosody.im/trunk/rev/6c804b6b2ca2. The commit I made at GitHub is here as well github.com/unredacted/xmpp.is/commit/dec09989c3164903588cf41b6e7ba4ca3eadf2c9.

I decided to make these changes because of the growing popularity of the server. I also know that the server is used by activists, journalists and people simply looking for a secure and privacy friendly way to chat. This is very important to me, so happy chatting!

~ Lunar

Hello users!

I’m sorry to inform everyone that registrations will be closed again. It feels like a roller-coaster with blog posts about registrations now. I discovered that, over the past 2 days 162,000 accounts have been registered on the server. Someone has found a way around our modified captcha code and made a script to bypass it. github.com/unredacted/mod_register_web

At this time Prosody stable does not support SNI in their HTTP library. I have enabled Google’s captcha but it will not work without SNI support from Prosody. Please see this tweet for further details: twitter.com/xmpp_is/status/1184830071644839936

ALL accounts registered within the past 2 days will be deleted, I’m very sorry for this, but I do not have the time to sort through all of the accounts (162k of them). If you’d like a new account, please contact me via email xmpp.is/contact

Cheers,
Lunar

Hello users!

Registrations are back… Yes, this is the 2nd time now. The cause of registrations breaking this time was an issue with Prosody’s HTTP library not supporting SNI. I am unsure what changed or happened exactly as it was working fine on Debian 9. After the upgrade to Debian 10 it broke. Unfortunately the Prosody devs likely don’t have much time to work on the issue, so a generous contributor Nathaniel Suchy improved the default captcha. This is good because we no longer have to use Google’s captcha (privacy issue). Nathaniel obfuscated the captcha code to make it harder for bots to automatically solve. Thank you Nathaniel!

Nathaniel made numerous commits to the mod_register_web module code. Nathaniel also made some changes to our mod_register_web theme code.

Check out Nathaniel’s blog if you have time to spare!

~ Lunar

Hello users!

Registrations are now back after a long period of being disabled. As you may have noticed, there was a large attack in which hundreds of thousands of accounts were registered in a couple days.

Found the issue. Over 70k accounts have been registered in the past 24 hours. It's causing issues with Prosody and making it hang. I've disabled registrations for now as they're posing a major threat to stability. We will need to work on the registration module & implement (1/2)

— XMPP.is (@xmpp_is) May 6, 2019

The abuser was able to bypass the terrible captcha that mod_web_register provides by default. It’s unfortunately easy to guess and as we saw, a person with enough dedication can make a script to spam register. As of now I’ve enabled Google’s recaptcha (begrudgingly) as a workaround for now. The public and private keys for that are injected via our prosody-secrets.sh script if you’re curious. The configuration on our GitHub did not need to be updated for this. We haven’t had much time to modify the Lua of the module, but plan to in the future with our git fork of the code github.com/unredacted/mod_register_web. If you’d like to contribute to that, we’d greatly appreciate it. If you have any questions don’t hesitate to contact!

~ Lunar

Hello users!

Last night I performed maintenance to disable mod_mam archives by default (along with the few other things).

Will be performing some important maintenance tonight 8 PM (CT) / 2 AM (UTC). mod_mam has been keeping archives for much longer than the expiry time set in the config and gets stuck purging old archived messages. To mitigate this I have set the archiving default to false.

— XMPP.is (@xmpp_is) February 10, 2019

This means that messages are not archived by default on the server, and are only archived if your XMPP client specifies that they should be. The MAM module has one major flaw right now. It cannot purge archives fast enough. It seems to get stuck and it kept the messages for much longer than it was supposed to. Due to this, during the maintenance I have purged all MAM archives from the server. Security, privacy and transparency are all my number one priorities when it comes to the server. When I enabled MAM on the server I had to consider the benefits vs the trade-offs. I believe we’ll be better off with MAM disabled by default, because a lot of clients don’t even support it yet.

If you can have any questions, feel free to reach out!

~ Lunar