I want to limit port 80 so that only one user can use it. I want to do this with iptables I have not found any documentation on how to do this.
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I want to limit port 80 so that only one user can use it. I want to do this with iptables I have not found any documentation on how to do this.
If you mean “a local user with a discrete uid” then you can use the owner module (
-m owner) and the--uid-owner #option.But there are some problems here:
By themselves, those might not normally be deal-breakers. But you need to effectively invert the conditional and block packets not matching the user. I suspect this will sufficiently break protocol processing that a simple attempt to do this will fail.
I would say, forward port 80 output that you know will have a user association to a separate chain, and then filter only that chain by user. This should sufficiently break other user’s traffic but not internal traffic to generally meet your requirement.