1 files changed, 101 insertions, 0 deletions
diff --git a/apps/strongswan/default.nix b/apps/strongswan/default.nix
new file mode 100644
index 0000000..d9a5034
--- /dev/null
+++ b/apps/strongswan/default.nix
@@ -0,0 +1,101 @@
+{ config, pkgs, lib, ... }:
+
+let
+
+  inherit (lib) mkIf mkOption types filterAttrs hasPrefix
+                mapAttrsToList concatStringsSep concatMapStringsSep;
+  inherit (types) listOf submodule path attrsOf;
+  inherit (builtins) filter toString toFile isList isBool;
+
+  cfg = config.nixsap.apps.strongswan;
+  explicit = filterAttrs (n: v: n != "_module" && v != null);
+
+  ipsecSecrets = toFile "ipsec.secrets" ''
+    ${concatMapStringsSep "\n" (f: "include ${f}") cfg.secrets}
+  '';
+
+  ipsecConf =
+    let
+      show = k: v:
+        if k == "charondebug" then concatStringsSep ","
+              (mapAttrsToList (t: l: "${t} ${toString l}") (explicit v))
+        else if isList v then concatStringsSep "," v
+        else if isBool v then (if v then "yes" else "no")
+        else toString v;
+      makeSections = type: sections: concatStringsSep "\n\n" (
+        mapAttrsToList (sec: attrs:
+          "${type} ${sec}\n" +
+            (concatStringsSep "\n" (
+              mapAttrsToList (k: v: "  ${k}=${show k v}") (explicit attrs)
+            ))
+        ) (explicit sections)
+      );
+      setupSec = makeSections "config" { inherit (cfg) setup; }; 
+      caSec = makeSections "ca" cfg.ca; 
+      connSec = makeSections "conn" cfg.conn; 
+    in toFile "ipsec.conf" ''
+      ${setupSec}
+      ${caSec}
+      ${connSec}
+    '';
+
+  strongswanConf = toFile "strongswan.conf" ''
+    charon { plugins { stroke { secrets_file = ${ipsecSecrets} } } }
+    starter { config_file = ${ipsecConf } }
+  '';
+
+in {
+  options.nixsap.apps.strongswan = {
+    secrets = mkOption {
+      description = ''
+        A list of paths to IPSec secret files. These files will be included into
+        the main ipsec.secrets file by the "include" directive
+      '';
+      type = listOf path;
+      default = [];
+    };
+    setup = mkOption {
+      description = ''
+        A set of options for the ‘config setup’ section of the
+        ipsec.conf file. Defines general configuration parameters
+      '';
+      type = submodule (import ./options/setup.nix);
+      default = {};
+    };
+    ca = mkOption {
+      description = ''
+        A set of CAs (certification authorities) and their options for
+        the ‘ca xxx’ sections of the ipsec.conf file
+      '';
+      type = attrsOf (submodule (import ./options/ca.nix));
+      default = {};
+    };
+    conn = mkOption {
+      description = ''
+        A set of connections and their options for the ‘conn xxx’
+        sections of the ipsec.conf file
+      '';
+      type = attrsOf (submodule (import ./options/conn.nix));
+      default = {};
+    };
+  };
+
+  config = mkIf ({} != explicit cfg.conn) {
+    nixsap.deployment.keyrings.root = filter (hasPrefix "/run/keys/") cfg.secrets;
+    environment.systemPackages = [ pkgs.strongswan ];
+    systemd.services.strongswan = {
+      description = "strongSwan IPSec Service";
+      wantedBy = [ "multi-user.target" ];
+      path = with pkgs; [ config.system.sbin.modprobe iproute iptables utillinux ];
+      wants = [ "keys.target" ];
+      after = [ "network.target" "keys.target" "local-fs.target" ];
+      environment = {
+        STRONGSWAN_CONF = strongswanConf;
+      };
+      serviceConfig = {
+        ExecStart  = "${pkgs.strongswan}/sbin/ipsec start --nofork";
+        Restart = "always";
+      };
+    };
+  };
+}