29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
78 lines
2.1 KiB
Nix
78 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.tcpcrypt;
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in
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{
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###### interface
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options = {
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networking.tcpcrypt.enable = mkOption {
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default = false;
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description = ''
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Whether to enable opportunistic TCP encryption. If the other end
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speaks Tcpcrypt, then your traffic will be encrypted; otherwise
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it will be sent in clear text. Thus, Tcpcrypt alone provides no
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guarantees -- it is best effort. If, however, a Tcpcrypt
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connection is successful and any attackers that exist are
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passive, then Tcpcrypt guarantees privacy.
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'';
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};
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};
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config = mkIf cfg.enable {
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users.extraUsers = singleton {
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name = "tcpcryptd";
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uid = config.ids.uids.tcpcryptd;
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description = "tcpcrypt daemon user";
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};
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jobs.tcpcrypt = {
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description = "tcpcrypt";
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wantedBy = ["multi-user.target"];
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after = ["network-interfaces.target"];
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path = [ pkgs.iptables pkgs.tcpcrypt pkgs.procps ];
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preStart = ''
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sysctl -n net.ipv4.tcp_ecn >/run/pre-tcpcrypt-ecn-state
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sysctl -w net.ipv4.tcp_ecn=0
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iptables -t raw -N nixos-tcpcrypt
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iptables -t raw -A nixos-tcpcrypt -p tcp -m mark --mark 0x0/0x10 -j NFQUEUE --queue-num 666
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iptables -t raw -I PREROUTING -j nixos-tcpcrypt
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iptables -t mangle -N nixos-tcpcrypt
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iptables -t mangle -A nixos-tcpcrypt -p tcp -m mark --mark 0x0/0x10 -j NFQUEUE --queue-num 666
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iptables -t mangle -I POSTROUTING -j nixos-tcpcrypt
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'';
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exec = "tcpcryptd -x 0x10";
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postStop = ''
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if [ -f /run/pre-tcpcrypt-ecn-state ]; then
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sysctl -w net.ipv4.tcp_ecn=$(cat /run/pre-tcpcrypt-ecn-state)
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fi
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iptables -t mangle -D POSTROUTING -j nixos-tcpcrypt || true
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iptables -t raw -D PREROUTING -j nixos-tcpcrypt || true
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iptables -t raw -F nixos-tcpcrypt || true
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iptables -t raw -X nixos-tcpcrypt || true
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iptables -t mangle -F nixos-tcpcrypt || true
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iptables -t mangle -X nixos-tcpcrypt || true
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'';
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};
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};
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}
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