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Message-ID: <loom.20140915T145605-849@post.gmane.org> Date: Mon, 15 Sep 2014 13:07:03 +0000 (UTC) From: Aleksei Besogonov <alex.besogonov@...il.com> To: linux-kernel@...r.kernel.org Subject: Run a script with cap_net_bind_service - mission impossible. Hi! It seems that it's totally impossible to start a script with cap_net_bind_service capability and as a non-root user without modifying system-wide settings. I've trawled the Net for a solution that should be exceedingly simple. I want to run a daemon under a non-privileged account AND allow it to bind to 'secure' ports (443, 589 and 53). So far I found the following non-solutions: - Use iptables to redirect ports. Doesn't work with local traffic. - Use an HTTP proxy server (yeah, and also a DNS proxy server). - Set cap_net_bind_service capability bit on the script interpreter (so it'll break during upgrades). - Fuck you, run it under the root user. With several permutations like: * Dropping caps after opening sockets (can't do this) * Dropping all caps before starting the interpreter (fucks up the file ownership) I've tried without any luck various permutations of capsh like: capsh --keep=1 --secbits=5 --user=cyberax --caps=cap_net_bind_service+eip -- -c 'nc -l 443' So is it possible at all? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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