264b49fce7
for the ports defined in networking.firewall.allowedTCPPorts. svn path=/nixos/branches/modular-nixos/; revision=16460
70 lines
1.4 KiB
Nix
70 lines
1.4 KiB
Nix
{pkgs, config, ...}:
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let
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iptables = "${pkgs.iptables}/sbin/iptables";
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in
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{
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###### interface
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options = {
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networking.firewall.allowedTCPPorts = pkgs.lib.mkOption {
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default = [];
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example = [22 80];
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type = pkgs.lib.types.list pkgs.lib.types.int;
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description =
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''
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List of TCP ports on which incoming connections are
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accepted.
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'';
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};
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};
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###### implementation
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config = {
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environment.systemPackages = [pkgs.iptables];
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jobs = pkgs.lib.singleton
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{ name = "firewall";
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preStart =
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''
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${iptables} -F
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# Accept all traffic on the loopback interface.
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${iptables} -A INPUT -i lo -j ACCEPT
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# Accept packets from established or related connections.
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${iptables} -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# Accept connections to the allowed TCP ports.
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${pkgs.lib.concatMapStrings (port:
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''
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${iptables} -A INPUT -p tcp --dport ${toString port} -j ACCEPT
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''
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) config.networking.firewall.allowedTCPPorts
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}
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# Drop everything else.
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${iptables} -A INPUT -j DROP
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'';
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postStop =
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''
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${iptables} -F
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'';
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};
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networking.firewall.allowedTCPPorts = [22];
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};
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}
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