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Lemmy.world seems to have banned the largest piracy community on Lemmy.
(lemmy.dbzer0.com)
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this post was submitted on 19 Mar 2024
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Lemmy makes local copies of everything when federation occurs. It's 100% on their server. The only exceptions are images posted as part of the comments, those are loaded directly. Then again, that adds the ability to add tracking pixels, so that's not exactly great for a piracy community either.
Image loading example
I turned off all the logging for this proof of concept but this could've been a transparent PNG pixel that tracks every bit of information your browser will give it.
Oof, yeah that's bad...
Neat. Has anyone brought this up to the devs here or on github before?
I'm not sure, but anything doing Markdown parsing and allowing images to be embedded is vulnerable to this. I kind of doubt that the devs don't know about this.
The alternative would be to download every image on the server and cache it until users start requesting the image files, rewriting the Markdown to link to the new image location. I can think of a few reasons why that's not implemented.
Proxying all comments was implemented in the backend at some point, I'm not sure why this feature was removed again. I can't find much in the repo history, you could ask the devs why the feature got removed if you're curious.
you could safeguard against this on the client side by not loading images from untrusted sources. irc clients did this
Ayo what the fuck how'd you do that
Your client asks my server for the image, my server does a basic IP location lookup based on a free internet database I downloaded last year and turns it into an image on the fly.
Got the state correct ๐
i really wish there were a way to disable images with some of these fancy lemmy clients for android. I'm not interested in any of them
If you use Sync, there's this setting you can toggle to disable embedded images. I'm not sure if this protects against network requests, but I think it should? If you disable the, images are represented as links instead.
nice. yea it replaces your image with a link.