k3: retiolum.nix -> tinc.nix

1 files changed, 216 insertions, 0 deletions

diff --git a/krebs/3modules/tinc.nix b/krebs/3modules/tinc.nix
new file mode 100644
index 000000000..67d383bb1
--- /dev/null
+++ b/krebs/3modules/tinc.nix
@@ -0,0 +1,216 @@
+{ config, pkgs, lib, ... }:
+with import <stockholm/lib>;
+let
+  out = {
+    options.krebs.tinc = api;
+    config = imp;
+  };
+
+  api = mkOption {
+    default = {};
+    description = ''
+      define a tinc network
+    '';
+    type = with types; attrsOf (submodule (tinc: {
+      options = let
+        netname = tinc.config._module.args.name;
+      in {
+
+        enable = mkEnableOption "krebs.tinc.${netname}" // { default = true; };
+
+        confDir = mkOption {
+          type = types.package;
+          default = pkgs.linkFarm "${netname}-etc-tinc"
+            (mapAttrsToList (name: path: { inherit name path; }) {
+              "hosts" = tinc.config.hostsPackage;
+              "tinc.conf" = pkgs.writeText "${netname}-tinc.conf" ''
+                Name = ${tinc.config.host.name}
+                Interface = ${netname}
+                ${concatMapStrings (c: "ConnectTo = ${c}\n") tinc.config.connectTo}
+                PrivateKeyFile = ${tinc.config.privkey.path}
+                Port = ${toString tinc.config.host.nets.${netname}.tinc.port}
+                ${tinc.config.extraConfig}
+              '';
+              "tinc-up" = pkgs.writeDash "${netname}-tinc-up" ''
+                ${tinc.config.iproutePackage}/sbin/ip link set ${netname} up
+                ${tinc.config.tincUp}
+              '';
+            });
+        };
+
+        host = mkOption {
+          type = types.host;
+          default = config.krebs.build.host;
+        };
+
+        netname = mkOption {
+          type = types.enum (attrNames tinc.config.host.nets);
+          default = netname;
+          description = ''
+            The tinc network name.
+            It is used to name the TUN device and to generate the default value for
+            <literal>config.krebs.tinc.retiolum.hosts</literal>.
+          '';
+        };
+
+        extraConfig = mkOption {
+          type = types.str;
+          default = "";
+          description = ''
+            Extra Configuration to be appended to tinc.conf
+          '';
+        };
+        tincUp = mkOption {
+          type = types.string;
+          default = let
+            net = tinc.config.host.nets.${netname};
+            iproute = tinc.config.iproutePackage;
+          in ''
+            ${optionalString (net.ip4 != null) /* sh */ ''
+              ${iproute}/sbin/ip -4 addr add ${net.ip4.addr} dev ${netname}
+              ${iproute}/sbin/ip -4 route add ${net.ip4.prefix} dev ${netname}
+            ''}
+            ${optionalString (net.ip6 != null) /* sh */ ''
+              ${iproute}/sbin/ip -6 addr add ${net.ip6.addr} dev ${netname}
+              ${iproute}/sbin/ip -6 route add ${net.ip6.prefix} dev ${netname}
+            ''}
+          '';
+          description = ''
+            tinc-up script to be used. Defaults to setting the
+            krebs.host.nets.<netname>.ip4 and ip6 for the new ips and
+            configures forwarding of the respecitive netmask as subnet.
+          '';
+        };
+
+        tincPackage = mkOption {
+          type = types.package;
+          default = pkgs.tinc;
+          description = "Tincd package to use.";
+        };
+
+        hosts = mkOption {
+          type = with types; attrsOf host;
+          default =
+            filterAttrs (_: h: hasAttr tinc.config.netname h.nets) config.krebs.hosts;
+          description = ''
+            Hosts to generate <literal>config.krebs.tinc.retiolum.hostsPackage</literal>.
+            Note that these hosts must have a network named
+            <literal>config.krebs.tinc.retiolum.netname</literal>.
+          '';
+        };
+
+        hostsArchive = mkOption {
+          type = types.package;
+          default = pkgs.runCommand "retiolum-hosts.tar.bz2" {} ''
+            ${pkgs.coreutils}/bin/ln -s ${tinc.config.hostsPackage} hosts
+            ${pkgs.gnutar}/bin/tar -hcjf $out hosts
+          '';
+          readOnly = true;
+        };
+
+        hostsPackage = mkOption {
+          type = types.package;
+          default = pkgs.stdenv.mkDerivation {
+            name = "${tinc.config.netname}-tinc-hosts";
+            phases = [ "installPhase" ];
+            installPhase = ''
+              mkdir $out
+              ${concatStrings (lib.mapAttrsToList (_: host: ''
+                echo ${shell.escape host.nets."${tinc.config.netname}".tinc.config} \
+                  > $out/${shell.escape host.name}
+              '') tinc.config.hosts)}
+            '';
+          };
+          description = ''
+            Package of tinc host configuration files.  By default, a package will
+            be generated from <literal>config.krebs.${tinc.config.netname}.hosts</literal>.  This
+            option's main purpose is to expose the generated hosts package to other
+            modules, like <literal>config.krebs.tinc_graphs</literal>.  But it can
+            also be used to provide a custom hosts directory.
+          '';
+          example = literalExample ''
+            (pkgs.stdenv.mkDerivation {
+              name = "my-tinc-hosts";
+              src = /home/tv/my-tinc-hosts;
+              installPhase = "cp -R . $out";
+            })
+          '';
+        };
+
+        iproutePackage = mkOption {
+          type = types.package;
+          default = pkgs.iproute;
+          description = "Iproute2 package to use.";
+        };
+
+        privkey = mkOption {
+          type = types.secret-file;
+          default = {
+            path = "${tinc.config.user.home}/tinc.rsa_key.priv";
+            owner = tinc.config.user;
+            source-path = toString <secrets> + "/${tinc.config.netname}.rsa_key.priv";
+          };
+        };
+
+        connectTo = mkOption {
+          type = types.listOf types.str;
+          ${if tinc.config.netname == "retiolum" then "default" else null} = [
+            "gum"
+            "ni"
+            "prism"
+          ];
+          description = ''
+            The list of hosts in the network which the client will try to connect
+            to.  These hosts should have an 'Address' configured which points to a
+            routeable IPv4 or IPv6 address.
+
+            In stockholm this can be done by configuring:
+              krebs.hosts.${connect-host}.nets.${netname?"retiolum"}.via.ip4.addr = external-ip
+              krebs.hosts.${connect-host}.nets.${netname?"retiolum"}.tinc.port = 1655;
+          '';
+        };
+
+        user = mkOption {
+          type = types.user;
+          default = {
+            name = tinc.config.netname;
+            home = "/var/lib/${tinc.config.user.name}";
+          };
+        };
+      };
+    }));
+  };
+
+  imp = {
+    # TODO `environment.systemPackages = [ cfg.tincPackage cfg.iproutePackage ]` for each network,
+    # avoid conflicts in environment if the packages differ
+
+    krebs.secret.files = mapAttrs' (netname: cfg:
+      nameValuePair "${netname}.rsa_key.priv" cfg.privkey ) config.krebs.tinc;
+
+    users.users = mapAttrs' (netname: cfg:
+      nameValuePair "${netname}" {
+        inherit (cfg.user) home name uid;
+        createHome = true;
+      }
+    ) config.krebs.tinc;
+
+    systemd.services = mapAttrs (netname: cfg:
+      let
+        tinc = cfg.tincPackage;
+        iproute = cfg.iproutePackage;
+      in {
+        description = "Tinc daemon for ${netname}";
+        after = [ "network.target" ];
+        wantedBy = [ "multi-user.target" ];
+        requires = [ "secret.service" ];
+        path = [ tinc iproute ];
+        serviceConfig = rec {
+          Restart = "always";
+          ExecStart = "${tinc}/sbin/tincd -c ${cfg.confDir} -d 0 -U ${cfg.user.name} -D --pidfile=/var/run/tinc.${SyslogIdentifier}.pid";
+          SyslogIdentifier = netname;
+        };
+      }
+    ) config.krebs.tinc;
+  };
+in out