nixpkgs/nixos/modules/services/networking/tcpcrypt.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.networking.tcpcrypt;
in
{
###### interface
options = {
networking.tcpcrypt.enable = mkOption {
default = false;
description = ''
Whether to enable opportunistic TCP encryption. If the other end
speaks Tcpcrypt, then your traffic will be encrypted; otherwise
it will be sent in clear text. Thus, Tcpcrypt alone provides no
guarantees -- it is best effort. If, however, a Tcpcrypt
connection is successful and any attackers that exist are
passive, then Tcpcrypt guarantees privacy.
'';
};
};
config = mkIf cfg.enable {
users.extraUsers = singleton {
name = "tcpcryptd";
uid = config.ids.uids.tcpcryptd;
description = "tcpcrypt daemon user";
};
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systemd.services.tcpcrypt = {
description = "tcpcrypt";
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wantedBy = [ "multi-user.target" ];
after = [ "network-interfaces.target" ];
path = [ pkgs.iptables pkgs.tcpcrypt pkgs.procps ];
preStart = ''
mkdir -p /var/run/tcpcryptd
chown tcpcryptd /var/run/tcpcryptd
sysctl -n net.ipv4.tcp_ecn >/run/pre-tcpcrypt-ecn-state
sysctl -w net.ipv4.tcp_ecn=0
iptables -t raw -N nixos-tcpcrypt
iptables -t raw -A nixos-tcpcrypt -p tcp -m mark --mark 0x0/0x10 -j NFQUEUE --queue-num 666
iptables -t raw -I PREROUTING -j nixos-tcpcrypt
iptables -t mangle -N nixos-tcpcrypt
iptables -t mangle -A nixos-tcpcrypt -p tcp -m mark --mark 0x0/0x10 -j NFQUEUE --queue-num 666
iptables -t mangle -I POSTROUTING -j nixos-tcpcrypt
'';
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script = "tcpcryptd -x 0x10";
postStop = ''
if [ -f /run/pre-tcpcrypt-ecn-state ]; then
sysctl -w net.ipv4.tcp_ecn=$(cat /run/pre-tcpcrypt-ecn-state)
fi
iptables -t mangle -D POSTROUTING -j nixos-tcpcrypt || true
iptables -t raw -D PREROUTING -j nixos-tcpcrypt || true
iptables -t raw -F nixos-tcpcrypt || true
iptables -t raw -X nixos-tcpcrypt || true
iptables -t mangle -F nixos-tcpcrypt || true
iptables -t mangle -X nixos-tcpcrypt || true
'';
};
};
}