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I just developed and published a script to clear your pict-rs object storage from potential CSAM. (github.com)
submitted 2 years ago* (last edited 2 years ago) by db0@lemmy.dbzer0.com to c/selfhosted@lemmy.world
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I noticed a bit of panic around here lately and as I have had to continuously fight against pedos for the past year, I have developed tools to help me detect and prevent this content.

As luck would have it, we recently published one of our anti-csam checker tool as a python library that anyone can use. So I thought I could use this to help lemmy admins feel a bit more safe.

The tool can either go through all your images via your object storage and delete all CSAM, or it canrun continuously and scan and delete all new images as well. Suggested option is to run it using --all once, and then run it as a daemon and leave it running.

Better options would be to be able to retrieve exact images uploaded via lemmy/pict-rs api but we're not there quite yet.

Let me know if you have any issue or improvements.

EDIT: Just to clarify, you should run this on your desktop PC with a GPU, not on your lemmy server!

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[-] sunaurus@lemm.ee 45 points 2 years ago

As a test, I ran this on a very early backup of lemm.ee images from when we had very little federation and very little uploads, and unfortunately it is finding a whole bunch of false positives. Just some examples it flagged as CSAM:

  • Calvin and Hobbes comic
  • The default Lemmy logo
  • Some random user's avatar, which is just a digital drawing of a person's face
  • a Pikachu image

Do you think the parameters of the script should be tuned? I'm happy to test it further on my backup, as I am reasonably certain that it doesn't contain any actual CSAM

[-] db0@lemmy.dbzer0.com 51 points 2 years ago* (last edited 2 years ago)

This is normal . You should be worried if it wasn't catching any false positives as it would mean a lot of false negatives would slip though. I am planning to add args to make it more or less severe, but I it will never be perfect. So long as it's not catching most images, and of the false positives most are porn or contain children, I consider with worthwhile.

I'll let you know when the functionality for he severity is updated

this post was submitted on 28 Aug 2023
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