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File canary kill switch (gitlab.com)
submitted 2 months ago by to c/linux@programming.dev
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I wrote a dead simple file canary tool that will install an eBPF program that drops all outgoing packets if a canary is touched. I wrote this in response to the current trend of supply chain attacks that try to harvest credentials

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[–] 6 points 2 months ago (3 children)

Interesting idea, but won't it get triggered constantly everytime you grep your repo?

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  • [–] [S] 15 points 2 months ago* (2 children)

    There is a very high chance there are files you will never use that a credential harvester would be interested in. For example some look for certain wallets that I definitely don't have, so I create a canary file for that. You can also add $HOME/.ssh/id_rsa and $HOME/.ssh/id_ed25519 and then use nonstandard key names for your typical key usage etc.

    I've been running this for a week now with no lost connections yet :)

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  • [–] 5 points 2 months ago (1 child)

    Okay, so not for protecting actual creds then. Makes sense, although would be nice to have a way to protect actual creds. No idea how that would be achievable though.

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  • [–] [S] 12 points 2 months ago*

    Right it's just for things you don't use but a credential harvester would find interesting.

    I've been working a lot on containing the blast radius with some careful LXC usage, but this was a quick way to get some real value without a ton of thought.

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