143 lines
3.9 KiB
Nix
143 lines
3.9 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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{
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options = {
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services.xl2tpd = {
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enable = mkEnableOption (lib.mdDoc "xl2tpd, the Layer 2 Tunnelling Protocol Daemon");
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serverIp = mkOption {
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type = types.str;
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description = lib.mdDoc "The server-side IP address.";
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default = "10.125.125.1";
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};
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clientIpRange = mkOption {
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type = types.str;
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description = lib.mdDoc "The range from which client IPs are drawn.";
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default = "10.125.125.2-11";
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};
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extraXl2tpOptions = mkOption {
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type = types.lines;
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description = lib.mdDoc "Adds extra lines to the xl2tpd configuration file.";
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default = "";
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};
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extraPppdOptions = mkOption {
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type = types.lines;
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description = lib.mdDoc "Adds extra lines to the pppd options file.";
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default = "";
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example = ''
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ms-dns 8.8.8.8
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ms-dns 8.8.4.4
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'';
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};
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};
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};
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config = mkIf config.services.xl2tpd.enable {
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systemd.services.xl2tpd = let
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cfg = config.services.xl2tpd;
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# Config files from https://help.ubuntu.com/community/L2TPServer
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xl2tpd-conf = pkgs.writeText "xl2tpd.conf" ''
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[global]
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ipsec saref = no
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[lns default]
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local ip = ${cfg.serverIp}
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ip range = ${cfg.clientIpRange}
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pppoptfile = ${pppd-options}
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length bit = yes
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; Extra
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${cfg.extraXl2tpOptions}
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'';
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pppd-options = pkgs.writeText "ppp-options-xl2tpd.conf" ''
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refuse-pap
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refuse-chap
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refuse-mschap
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require-mschap-v2
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# require-mppe-128
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asyncmap 0
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auth
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crtscts
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idle 1800
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mtu 1200
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mru 1200
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lock
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hide-password
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local
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# debug
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name xl2tpd
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# proxyarp
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lcp-echo-interval 30
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lcp-echo-failure 4
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# Extra:
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${cfg.extraPppdOptions}
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'';
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xl2tpd-ppp-wrapped = pkgs.stdenv.mkDerivation {
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name = "xl2tpd-ppp-wrapped";
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phases = [ "installPhase" ];
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nativeBuildInputs = with pkgs; [ makeWrapper ];
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installPhase = ''
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mkdir -p $out/bin
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makeWrapper ${pkgs.ppp}/sbin/pppd $out/bin/pppd \
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--set LD_PRELOAD "${pkgs.libredirect}/lib/libredirect.so" \
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--set NIX_REDIRECTS "/etc/ppp=/etc/xl2tpd/ppp"
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makeWrapper ${pkgs.xl2tpd}/bin/xl2tpd $out/bin/xl2tpd \
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--set LD_PRELOAD "${pkgs.libredirect}/lib/libredirect.so" \
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--set NIX_REDIRECTS "${pkgs.ppp}/sbin/pppd=$out/bin/pppd"
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'';
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};
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in {
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description = "xl2tpd server";
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requires = [ "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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mkdir -p -m 700 /etc/xl2tpd
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pushd /etc/xl2tpd > /dev/null
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mkdir -p -m 700 ppp
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[ -f ppp/chap-secrets ] || cat > ppp/chap-secrets << EOF
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# Secrets for authentication using CHAP
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# client server secret IP addresses
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#username xl2tpd password *
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EOF
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chown root:root ppp/chap-secrets
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chmod 600 ppp/chap-secrets
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# The documentation says this file should be present but doesn't explain why and things work even if not there:
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[ -f l2tp-secrets ] || (echo -n "* * "; ${pkgs.apg}/bin/apg -n 1 -m 32 -x 32 -a 1 -M LCN) > l2tp-secrets
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chown root:root l2tp-secrets
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chmod 600 l2tp-secrets
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popd > /dev/null
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mkdir -p /run/xl2tpd
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chown root:root /run/xl2tpd
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chmod 700 /run/xl2tpd
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'';
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serviceConfig = {
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ExecStart = "${xl2tpd-ppp-wrapped}/bin/xl2tpd -D -c ${xl2tpd-conf} -s /etc/xl2tpd/l2tp-secrets -p /run/xl2tpd/pid -C /run/xl2tpd/control";
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KillMode = "process";
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Restart = "on-success";
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Type = "simple";
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PIDFile = "/run/xl2tpd/pid";
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};
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};
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};
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}
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