this post was submitted on 20 Jun 2023
211 points (100.0% liked)
Technology
37695 readers
174 users here now
A nice place to discuss rumors, happenings, innovations, and challenges in the technology sphere. We also welcome discussions on the intersections of technology and society. If it’s technological news or discussion of technology, it probably belongs here.
Remember the overriding ethos on Beehaw: Be(e) Nice. Each user you encounter here is a person, and should be treated with kindness (even if they’re wrong, or use a Linux distro you don’t like). Personal attacks will not be tolerated.
Subcommunities on Beehaw:
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Fun fact, I purposefully goaded the bots into attacking my instance.
Turns out they aren't even using the web form, they're going straight to the register api endpoint with python. The api endpoint lives at a different place from the signup page and putting a captcha in front of that page was useless in stopping the bots. Now, we can't just challenge requests going to the API endpoint since it's not an interactive session - it would break registration for normal users as well.
The in-built captcha was part of the API form in a way that prevented this attack where the standard Cloudflare rules are either too weak (providing no protection) or too strong (breaking functionality).
In my case I had to create some special rules to exclude python clients and other bots while making sure to keep valid browser attempts working. It was kind of a pain, actually. There's a lot of Lemmy that seems to trip the optional OWASP managed rules so there's a lot of "artisanally crafted" exclusions to keep the site functional.
Anyways, I guess my point is form interaction is just one way to spam sites, but this particular attacker is using the backend API and forgoing the sign-up page entirely. Hidden fields wouldn't be useful here, IMO.