81 lines
2.1 KiB
Nix
81 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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systemd.services.tcpcrypt = {
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description = "tcpcrypt";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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path = [ pkgs.iptables pkgs.tcpcrypt pkgs.procps ];
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preStart = ''
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mkdir -p /var/run/tcpcryptd
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chown tcpcryptd /var/run/tcpcryptd
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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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script = "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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