Date: Mon, 20 Aug 2018 16:47:18 +0200 From: Stefan Bethke <stb@lassitu.de> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Bind to port <1024 in jail Message-ID: <75536186-7D58-498C-BFC6-9284EB7CB444@lassitu.de>
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I have a Go program (acme-dns) that wants to bind 53, 80, and 443, and I’d rather have it run as a non-privileged user. The program doesn’t provide a facility to drop privs after binding the ports. I’m planning to run it in a jail. After some googling, it appears that a couple of years ago I should have been able to do: sysctl net.inet.ip.portrange.reservedhigh=0 and allow all processes to bind to „low“ ports. This does not work in my jails on a 11-stable host. $ sudo sysctl net.inet.ip.portrange.reservedhigh=0 net.inet.ip.portrange.reservedhigh: 1023 sysctl: net.inet.ip.portrange.reservedhigh=0: Operation not permitted Securelevel should not interfere: $ sysctl kern.securelevel kern.securelevel: -1 Is there a way to allow regular processes to bind to low ports? Stefan -- Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
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