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Blocking AI crawlers with Caddy (lemmy.world)

submitted 6 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]

19 comments fedilink hide all child comments

I was reading the reddit thread on Claude AI crawlers effectively DDOSing Linux Mint forums https://libreddit.lunar.icu/r/linux/comments/1ceco4f/claude_ai_name_and_shame/

and I wanted to block all ai crawlers from my selfhosted stuff.

I don't trust crawlers to respect the Robots.txt but you can get one here: https://darkvisitors.com/

Since I use Caddy as a Server, I generated a directive that blocks them based on their useragent. The content of the regex basically comes from darkvisitors.

Sidenote - there is a module for blocking crawlers as well, but it seemed overkill for me https://github.com/Xumeiquer/nobots

For anybody who is interested, here is the block_ai_crawlers.conf I wrote.

(blockAiCrawlers) {
  @blockAiCrawlers {
    header_regexp User-Agent "(?i)(Bytespider|CCBot|Diffbot|FacebookBot|Google-Extended|GPTBot|omgili|anthropic-ai|Claude-Web|ClaudeBot|cohere-ai)"
  }
  handle @blockAiCrawlers {
    abort
  }
}

# Usage:
# 1. Place this file next to your Caddyfile
# 2. Edit your Caddyfile as in the example below
#
# ```
# import block_ai_crawlers.conf
#
# www.mywebsite.com {
#   import blockAiCrawlers
#   reverse_proxy * localhost:3000
# }
# ```

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[–] [email protected] 3 points 6 months ago

From your recommendation, I found a related project pandoras_pot that I am able to run in a Docker container, and seems to run more efficiently on my Pi home server. I now use it in my Caddyfile to redirect a number of fake subdomains and paths that are likely to be found by a malicious bot (of course all are excluded in my robots.txt for bots that actually respect it). Thanks for the recommendation!