From fb6b4860c759380f2a61dd36814f159004aea361 Mon Sep 17 00:00:00 2001
From: obadz <obadz-git@obadz.com>
Date: Mon, 20 Jun 2016 20:54:17 +0100
Subject: xl2tpd: add nixos module for service

(required adding execv to libredirect)
---
 nixos/modules/services/networking/xl2tpd.nix | 143 +++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 nixos/modules/services/networking/xl2tpd.nix

(limited to 'nixos/modules/services/networking/xl2tpd.nix')

diff --git a/nixos/modules/services/networking/xl2tpd.nix b/nixos/modules/services/networking/xl2tpd.nix
new file mode 100644
index 00000000000..5e006c13f0d
--- /dev/null
+++ b/nixos/modules/services/networking/xl2tpd.nix
@@ -0,0 +1,143 @@
+{ config, stdenv, pkgs, lib, ... }:
+
+with lib;
+
+{
+  options = {
+    services.xl2tpd = {
+      enable = mkEnableOption "Whether xl2tpd should be run on startup.";
+
+      serverIp = mkOption {
+        type        = types.string;
+        description = "The server-side IP address.";
+        default     = "10.125.125.1";
+      };
+
+      clientIpRange = mkOption {
+        type        = types.string;
+        description = "The range from which client IPs are drawn.";
+        default     = "10.125.125.2-11";
+      };
+
+      extraXl2tpOptions = mkOption {
+        type        = types.lines;
+        description = "Adds extra lines to the xl2tpd configuration file.";
+        default     = "";
+      };
+
+      extraPppdOptions = mkOption {
+        type        = types.lines;
+        description = "Adds extra lines to the pppd options file.";
+        default     = "";
+        example     = ''
+          ms-dns 8.8.8.8
+          ms-dns 8.8.4.4
+        '';
+      };
+    };
+  };
+
+  config = mkIf config.services.xl2tpd.enable {
+    systemd.services.xl2tpd = let
+      cfg = config.services.xl2tpd;
+
+      # Config files from https://help.ubuntu.com/community/L2TPServer
+      xl2tpd-conf = pkgs.writeText "xl2tpd.conf" ''
+        [global]
+        ipsec saref = no
+
+        [lns default]
+        local ip = ${cfg.serverIp}
+        ip range = ${cfg.clientIpRange}
+        pppoptfile = ${pppd-options}
+        length bit = yes
+
+        ; Extra
+        ${cfg.extraXl2tpOptions}
+      '';
+
+      pppd-options = pkgs.writeText "ppp-options-xl2tpd.conf" ''
+        refuse-pap
+        refuse-chap
+        refuse-mschap
+        require-mschap-v2
+        # require-mppe-128
+        asyncmap 0
+        auth
+        crtscts
+        idle 1800
+        mtu 1200
+        mru 1200
+        lock
+        hide-password
+        local
+        # debug
+        name xl2tpd
+        # proxyarp
+        lcp-echo-interval 30
+        lcp-echo-failure 4
+
+        # Extra:
+        ${cfg.extraPppdOptions}
+      '';
+
+      xl2tpd-ppp-wrapped = pkgs.stdenv.mkDerivation {
+        name         = "xl2tpd-ppp-wrapped";
+        phases       = [ "installPhase" ];
+        buildInputs  = with pkgs; [ makeWrapper ];
+        installPhase = ''
+          mkdir -p $out/bin
+
+          makeWrapper ${pkgs.ppp}/sbin/pppd $out/bin/pppd \
+            --set LD_PRELOAD    "${pkgs.libredirect}/lib/libredirect.so" \
+            --set NIX_REDIRECTS "/etc/ppp=/etc/xl2tpd/ppp"
+
+          makeWrapper ${pkgs.xl2tpd}/bin/xl2tpd $out/bin/xl2tpd \
+            --set LD_PRELOAD    "${pkgs.libredirect}/lib/libredirect.so" \
+            --set NIX_REDIRECTS "${pkgs.ppp}/sbin/pppd=$out/bin/pppd"
+        '';
+      };
+    in {
+      description = "xl2tpd server";
+
+      requires = [ "network-online.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      preStart = ''
+        mkdir -p -m 700 /etc/xl2tpd
+
+        pushd /etc/xl2tpd > /dev/null
+
+        mkdir -p -m 700 ppp
+
+        [ -f ppp/chap-secrets ] || cat > ppp/chap-secrets << EOF
+        # Secrets for authentication using CHAP
+        # client	server	secret		IP addresses
+        #username	xl2tpd	password	*
+        EOF
+
+        chown root.root ppp/chap-secrets
+        chmod 600 ppp/chap-secrets
+
+        # The documentation says this file should be present but doesn't explain why and things work even if not there:
+        [ -f l2tp-secrets ] || (echo -n "* * "; ${pkgs.apg}/bin/apg -n 1 -m 32 -x 32 -a 1 -M LCN) > l2tp-secrets
+        chown root.root l2tp-secrets
+        chmod 600 l2tp-secrets
+
+        popd > /dev/null
+
+        mkdir -p /run/xl2tpd
+        chown root.root /run/xl2tpd
+        chmod 700       /run/xl2tpd
+      '';
+
+      serviceConfig = {
+        ExecStart = "${xl2tpd-ppp-wrapped}/bin/xl2tpd -D -c ${xl2tpd-conf} -s /etc/xl2tpd/l2tp-secrets -p /run/xl2tpd/pid -C /run/xl2tpd/control";
+        KillMode  = "process";
+        Restart   = "on-success";
+        Type      = "simple";
+        PIDFile   = "/run/xl2tpd/pid";
+      };
+    };
+  };
+}
-- 
cgit 1.4.1