NWO

8 files changed, 1379 insertions, 0 deletions

diff --git a/3modules/tv/consul.nix b/3modules/tv/consul.nix
new file mode 100644
index 000000000..dc9a180dd
--- /dev/null
+++ b/3modules/tv/consul.nix
@@ -0,0 +1,122 @@
+{ config, lib, pkgs, ... }:
+
+# if quorum gets lost, then start any node with a config that doesn't contain bootstrap_expect
+# but -bootstrap
+# TODO consul-bootstrap HOST  that actually does is
+# TODO tools to inspect state of a cluster in outage state
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.consul;
+
+  out = {
+    imports = [ ../../3modules/tv/iptables.nix ];
+    options.tv.consul = api;
+    config = mkIf cfg.enable (mkMerge [
+      imp
+      { tv.iptables.input-retiolum-accept-new-tcp = [ "8300" "8301" ]; }
+      # TODO udp for 8301
+    ]);
+  };
+
+  api = {
+    # TODO inherit (lib) api.options.enable; oder so
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "enable tv.consul";
+    };
+    dc = mkOption {
+      type = types.unspecified;
+    };
+    hosts = mkOption {
+      type = with types; listOf unspecified;
+    };
+    encrypt-file = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/root/src/secrets/consul-encrypt.json";
+    };
+    data-dir = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/var/lib/consul";
+    };
+    self = mkOption {
+      type = types.unspecified;
+    };
+    server = mkOption {
+      type = types.bool;
+      default = false;
+    };
+    GOMAXPROCS = mkOption {
+      type = types.int;
+      default = cfg.self.cores;
+    };
+  };
+
+  consul-config = {
+    datacenter = cfg.dc;
+    data_dir = cfg.data-dir;
+    log_level = "INFO";
+    #node_name =
+    server = cfg.server;
+    bind_addr = cfg.self.addr; # TODO cfg.addr
+    enable_syslog = true;
+    retry_join = map (getAttr "addr") (filter (host: host.fqdn != cfg.self.fqdn) cfg.hosts);
+    leave_on_terminate = true;
+  } // optionalAttrs cfg.server {
+    bootstrap_expect = length cfg.hosts;
+    leave_on_terminate = false;
+  };
+
+  imp = {
+    environment.systemPackages = with pkgs; [
+      consul
+    ];
+
+    systemd.services.consul = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = with pkgs; [
+        consul
+      ];
+      environment = {
+        GOMAXPROCS = toString cfg.GOMAXPROCS;
+      };
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "consul";
+        User = user.name;
+        PrivateTmp = "true";
+        Restart = "always";
+        ExecStartPre = pkgs.writeScript "consul-init" ''
+          #! /bin/sh
+          mkdir -p ${cfg.data-dir}
+          chown consul: ${cfg.data-dir}
+          install -o ${user.name} -m 0400 ${cfg.encrypt-file} /tmp/encrypt.json
+        '';
+        ExecStart = pkgs.writeScript "consul-service" ''
+          #! /bin/sh
+          set -euf
+          exec >/dev/null
+          exec consul agent \
+            -config-file=${toFile "consul.json" (toJSON consul-config)} \
+            -config-file=/tmp/encrypt.json
+        '';
+        #-node=${cfg.self.fqdn} \
+        #ExecStart = "${tinc}/sbin/tincd -c ${confDir} -d 0 -U ${user} -D";
+      };
+    };
+
+    users.extraUsers = singleton {
+      inherit (user) name uid;
+    };
+  };
+
+  user = {
+    name = "consul";
+    uid = 2983239726; # genid consul
+  };
+
+in
+out
diff --git a/3modules/tv/ejabberd.nix b/3modules/tv/ejabberd.nix
new file mode 100644
index 000000000..ffcc5cfb4
--- /dev/null
+++ b/3modules/tv/ejabberd.nix
@@ -0,0 +1,171 @@
+{ config, lib, pkgs, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.ejabberd;
+
+  out = {
+    options.tv.ejabberd = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+
+    certFile = mkOption {
+      type = types.str;
+      default = "/root/src/secrets/ejabberd.pem";
+    };
+
+    hosts = mkOption {
+      type = with types; listOf str;
+    };
+  };
+
+  imp = {
+    environment.systemPackages = [ my-ejabberdctl ];
+
+    systemd.services.ejabberd = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        Type = "oneshot";
+        RemainAfterExit = "yes";
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "ejabberd";
+        User = user.name;
+        PrivateTmp = "true";
+        ExecStartPre = pkgs.writeScript "ejabberd-start" ''
+          #! /bin/sh
+          install -o ${user.name} -m 0400 ${cfg.certFile} /tmp/certfile.pem
+        '';
+        ExecStart = pkgs.writeScript "ejabberd-service" ''
+          #! /bin/sh
+          ${my-ejabberdctl}/bin/ejabberdctl start
+        '';
+      };
+    };
+
+    users.extraUsers = singleton {
+      inherit (user) name uid;
+      home = "/var/ejabberd";
+      createHome = true;
+    };
+  };
+
+  user = {
+    name = "ejabberd";
+    uid = 405222; 
+    # TODO uid = 3483034447; # genid ejabberd
+  };
+
+  my-ejabberdctl = pkgs.writeScriptBin "ejabberdctl" ''
+    #! /bin/sh
+    set -euf
+    exec env \
+        SPOOLDIR=/var/ejabberd \
+        EJABBERD_CONFIG_PATH=${config-file} \
+      ${pkgs.ejabberd}/bin/ejabberdctl \
+        --logs /var/ejabberd \
+        "$@"
+  '';
+
+  config-file = pkgs.writeText "ejabberd.cfg" ''
+    {loglevel, 3}.
+    {hosts, ${toErlang cfg.hosts}}.
+    {listen,
+     [
+      {5222, ejabberd_c2s, [
+          starttls,
+          {certfile, "/tmp/certfile.pem"},
+          {access, c2s},
+          {shaper, c2s_shaper},
+          {max_stanza_size, 65536}
+               ]},
+      {5269, ejabberd_s2s_in, [
+             {shaper, s2s_shaper},
+             {max_stanza_size, 131072}
+            ]},
+      {5280, ejabberd_http, [
+           captcha,
+           http_bind,
+           http_poll,
+           web_admin
+          ]}
+     ]}.
+    {s2s_use_starttls, required}.
+    {s2s_certfile, "/tmp/certfile.pem"}.
+    {auth_method, internal}.
+    {shaper, normal, {maxrate, 1000}}.
+    {shaper, fast, {maxrate, 50000}}.
+    {max_fsm_queue, 1000}.
+    {acl, local, {user_regexp, ""}}.
+    {access, max_user_sessions, [{10, all}]}.
+    {access, max_user_offline_messages, [{5000, admin}, {100, all}]}.
+    {access, local, [{allow, local}]}.
+    {access, c2s, [{deny, blocked},
+             {allow, all}]}.
+    {access, c2s_shaper, [{none, admin},
+              {normal, all}]}.
+    {access, s2s_shaper, [{fast, all}]}.
+    {access, announce, [{allow, admin}]}.
+    {access, configure, [{allow, admin}]}.
+    {access, muc_admin, [{allow, admin}]}.
+    {access, muc_create, [{allow, local}]}.
+    {access, muc, [{allow, all}]}.
+    {access, pubsub_createnode, [{allow, local}]}.
+    {access, register, [{allow, all}]}.
+    {language, "en"}.
+    {modules,
+     [
+      {mod_adhoc,    []},
+      {mod_announce, [{access, announce}]},
+      {mod_blocking,[]},
+      {mod_caps,     []},
+      {mod_configure,[]},
+      {mod_disco,    []},
+      {mod_irc,      []},
+      {mod_http_bind, []},
+      {mod_last,     []},
+      {mod_muc,      [
+          {access, muc},
+          {access_create, muc_create},
+          {access_persistent, muc_create},
+          {access_admin, muc_admin}
+         ]},
+      {mod_offline,  [{access_max_user_messages, max_user_offline_messages}]},
+      {mod_ping,     []},
+      {mod_privacy,  []},
+      {mod_private,  []},
+      {mod_pubsub,   [
+          {access_createnode, pubsub_createnode},
+          {ignore_pep_from_offline, true},
+          {last_item_cache, false},
+          {plugins, ["flat", "hometree", "pep"]}
+         ]},
+      {mod_register, [
+          {welcome_message, {"Welcome!",
+                 "Hi.\nWelcome to this XMPP server."}},
+          {ip_access, [{allow, "127.0.0.0/8"},
+                 {deny, "0.0.0.0/0"}]},
+          {access, register}
+         ]},
+      {mod_roster,   []},
+      {mod_shared_roster,[]},
+      {mod_stats,    []},
+      {mod_time,     []},
+      {mod_vcard,    []},
+      {mod_version,  []}
+     ]}.
+  '';
+
+
+  # XXX this is a placeholder that happens to work the default strings.
+  toErlang = builtins.toJSON;
+
+in
+out
diff --git a/3modules/tv/git.nix b/3modules/tv/git.nix
new file mode 100644
index 000000000..4ab0df257
--- /dev/null
+++ b/3modules/tv/git.nix
@@ -0,0 +1,406 @@
+arg@{ config, pkgs, lib, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.git;
+
+  out = {
+    imports = [
+      ../../3modules/tv/nginx.nix
+    ];
+    options.tv.git = api;
+    config = mkIf cfg.enable (mkMerge [
+      imp
+    ]);
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Enable Git repository hosting.";
+    };
+    cgit = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Enable cgit."; # TODO better desc; talk about nginx
+    };
+    dataDir = mkOption {
+      type = types.str;
+      default = "/var/lib/git";
+      description = "Directory used to store repositories.";
+    };
+    etcDir = mkOption {
+      type = types.str;
+      default = "/etc/git";
+    };
+    rules = mkOption {
+      type = types.unspecified;
+    };
+    repos = mkOption {
+      type = types.attrsOf (types.submodule ({
+        options = {
+          desc = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = ''
+              Repository description.
+            '';
+          };
+          section = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = ''
+              Repository section.
+            '';
+          };
+          name = mkOption {
+            type = types.str;
+            description = ''
+              Repository name.
+            '';
+          };
+          hooks = mkOption {
+            type = types.attrsOf types.str;
+            description = ''
+              Repository-specific hooks.
+            '';
+          };
+          public = mkOption {
+            type = types.bool;
+            default = false;
+            description = ''
+              Allow everybody to read the repository via HTTP if cgit enabled.
+            '';
+            # TODO allow every configured user to fetch the repository via SSH.
+          };
+        };
+      }));
+
+      default = {};
+
+      example = literalExample ''
+        {
+          testing = {
+            name = "testing";
+            hooks.post-update = '''
+              #! /bin/sh
+              set -euf
+              echo post-update hook: $* >&2
+            ''';
+          };
+          testing2 = { name = "testing2"; };
+        }
+      '';
+
+      description = ''
+        Repositories.
+      '';
+    };
+    users = mkOption {
+      type = types.unspecified;
+    };
+  };
+
+  imp = {
+    system.activationScripts.git-init = "${init-script}";
+    
+    # TODO maybe put all scripts here and then use PATH?
+    environment.etc."${etc-base}".source =
+      scriptFarm "git-ssh-authorizers" {
+        authorize-command = makeAuthorizeScript (map ({ repo, user, perm }: [
+          (map getName (ensureList user))
+          (map getName (ensureList repo))
+          (map getName perm.allow-commands)
+        ]) cfg.rules);
+    
+        authorize-push = makeAuthorizeScript (map ({ repo, user, perm }: [
+          (map getName (ensureList user))
+          (map getName (ensureList repo))
+          (ensureList perm.allow-receive-ref)
+          (map getName perm.allow-receive-modes)
+        ]) (filter (x: hasAttr "allow-receive-ref" x.perm) cfg.rules));
+      };
+    
+    users.extraUsers = singleton {
+      description = "Git repository hosting user";
+      name = "git";
+      shell = "/bin/sh";
+      openssh.authorizedKeys.keys =
+        mapAttrsToList (_: makeAuthorizedKey git-ssh-command) cfg.users;
+      uid = 112606723; # genid git
+    };
+  };
+
+
+  ensureList = x:
+    if typeOf x == "list" then x else [x];
+
+  getName = x: x.name;
+
+  isPublicRepo = getAttr "public"; # TODO this is also in ./cgit.nix
+
+  makeAuthorizedKey = git-ssh-command: user@{ name, pubkey }:
+    # TODO assert name
+    # TODO assert pubkey
+    let
+      options = concatStringsSep "," [
+        ''command="exec ${git-ssh-command} ${name}"''
+        "no-agent-forwarding"
+        "no-port-forwarding"
+        "no-pty"
+        "no-X11-forwarding"
+      ];
+    in
+    "${options} ${pubkey}";
+
+  # [case-pattern] -> shell-script
+  # Create a shell script that succeeds (exit 0) when all its arguments
+  # match the case patterns (in the given order).
+  makeAuthorizeScript =
+    let
+      # TODO escape
+      to-pattern = x: concatStringsSep "|" (ensureList x);
+      go = i: ps:
+        if ps == []
+          then "exit 0"
+          else ''
+            case ''$${toString i} in ${to-pattern (head ps)})
+            ${go (i + 1) (tail ps)}
+            esac'';
+    in
+    patterns: ''
+      #! /bin/sh
+      set -euf
+      ${concatStringsSep "\n" (map (go 1) patterns)}
+      exit -1
+    '';
+
+  reponames = rules: sort lessThan (unique (map (x: x.repo.name) rules));
+
+  # TODO makeGitHooks that uses runCommand instead of scriptFarm?
+  scriptFarm =
+    farm-name: scripts:
+    let
+      makeScript = script-name: script-string: {
+        name = script-name;
+        path = pkgs.writeScript "${farm-name}_${script-name}" script-string;
+      };
+    in
+    pkgs.linkFarm farm-name (mapAttrsToList makeScript scripts);
+
+
+  git-ssh-command = pkgs.writeScript "git-ssh-command" ''
+    #! /bin/sh
+    set -euf
+
+    PATH=${makeSearchPath "bin" (with pkgs; [
+      coreutils
+      git
+      gnugrep
+      gnused
+      systemd
+    ])}
+
+    abort() {
+      echo "error: $1" >&2
+      systemd-cat -p err -t git echo "error: $1"
+      exit -1
+    }
+
+    GIT_SSH_USER=$1
+
+    systemd-cat -p info -t git echo \
+      "authorizing $GIT_SSH_USER $SSH_CONNECTION $SSH_ORIGINAL_COMMAND"
+
+    # References: The Base Definitions volume of
+    # POSIX.1‐2013, Section 3.278, Portable Filename Character Set
+    portable_filename_bre="^[A-Za-z0-9._-]\\+$"
+
+    command=$(echo "$SSH_ORIGINAL_COMMAND" \
+      | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\1/p' \
+      | grep "$portable_filename_bre" \
+      || abort 'cannot read command')
+
+    GIT_SSH_REPO=$(echo "$SSH_ORIGINAL_COMMAND" \
+      | sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\2/p' \
+      | grep "$portable_filename_bre" \
+      || abort 'cannot read reponame')
+
+    ${cfg.etcDir}/authorize-command \
+        "$GIT_SSH_USER" "$GIT_SSH_REPO" "$command" \
+      || abort 'access denied'
+
+    repodir=${escapeShellArg cfg.dataDir}/$GIT_SSH_REPO
+
+    systemd-cat -p info -t git \
+      echo "authorized exec $command $repodir"
+
+    export GIT_SSH_USER
+    export GIT_SSH_REPO
+    exec "$command" "$repodir"
+  '';
+
+  init-script = pkgs.writeScript "git-init" ''
+    #! /bin/sh
+    set -euf
+
+    PATH=${makeSearchPath "bin" (with pkgs; [
+      coreutils
+      findutils
+      gawk
+      git
+      gnugrep
+      gnused
+    ])}
+
+    dataDir=${escapeShellArg cfg.dataDir}
+    mkdir -p "$dataDir"
+
+    # Notice how the presence of hooks symlinks determine whether
+    # we manage a repositry or not.
+
+    # Make sure that no existing repository has hooks.  We can delete
+    # symlinks because we assume we created them.
+    find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks -type l -delete
+    bad_hooks=$(find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks)
+    if echo "$bad_hooks" | grep -q .; then
+      printf 'error: unknown hooks:\n%s\n' \
+        "$(echo "$bad_hooks" | sed 's/^/  /')" \
+        >&2
+      exit -1
+    fi
+
+    # Initialize repositories.
+    ${concatMapStringsSep "\n" (repo:
+      let
+        hooks = scriptFarm "git-hooks" (makeHooks repo);
+      in
+      ''
+        reponame=${escapeShellArg repo.name}
+        repodir=$dataDir/$reponame
+        mode=${toString (if isPublicRepo repo then 0711 else 0700)}
+        if ! test -d "$repodir"; then
+          mkdir -m "$mode" "$repodir"
+          git init --bare --template=/var/empty "$repodir"
+          chown -R git:nogroup "$repodir"
+        fi
+        ln -s ${hooks} "$repodir/hooks"
+      ''
+    ) (attrValues cfg.repos)}
+
+    # Warn about repositories that exist but aren't mentioned in the
+    # current configuration (and thus didn't receive a hooks symlink).
+    unknown_repos=$(find "$dataDir" -mindepth 1 -maxdepth 1 \
+      -type d \! -exec test -e '{}/hooks' \; -print)
+    if echo "$unknown_repos" | grep -q .; then
+      printf 'warning: stale repositories:\n%s\n' \
+        "$(echo "$unknown_repos" | sed 's/^/  /')" \
+        >&2
+    fi
+  '';
+
+  makeHooks = repo: removeAttrs repo.hooks [ "pre-receive" ] // {
+    pre-receive = ''
+      #! /bin/sh
+      set -euf
+
+      PATH=${makeSearchPath "bin" (with pkgs; [
+        coreutils # env
+        git
+        systemd
+      ])}
+
+      accept() {
+        #systemd-cat -p info -t git echo "authorized $1"
+        accept_string="''${accept_string+$accept_string
+      }authorized $1"
+      }
+      reject() {
+        #systemd-cat -p err -t git echo "denied $1"
+        #echo 'access denied' >&2
+        #exit_code=-1
+        reject_string="''${reject_string+$reject_string
+      }access denied: $1"
+      }
+
+      empty=0000000000000000000000000000000000000000
+
+      accept_string=
+      reject_string=
+      while read oldrev newrev ref; do
+
+        if [ $oldrev = $empty ]; then
+          receive_mode=create
+        elif [ $newrev = $empty ]; then
+          receive_mode=delete
+        elif [ "$(git merge-base $oldrev $newrev)" = $oldrev ]; then
+          receive_mode=fast-forward
+        else
+          receive_mode=non-fast-forward
+        fi
+
+        if ${cfg.etcDir}/authorize-push \
+            "$GIT_SSH_USER" "$GIT_SSH_REPO" "$ref" "$receive_mode"; then
+          accept "$receive_mode $ref"
+        else
+          reject "$receive_mode $ref"
+        fi
+      done
+
+      if [ -n "$reject_string" ]; then
+        systemd-cat -p err -t git echo "$reject_string"
+        exit -1
+      fi
+
+      systemd-cat -p info -t git echo "$accept_string"
+
+      ${optionalString (hasAttr "post-receive" repo.hooks) ''
+        # custom post-receive hook
+        ${repo.hooks.post-receive}''}
+    '';
+  };
+
+  etc-base =
+    assert (hasPrefix "/etc/" cfg.etcDir);
+    removePrefix "/etc/" cfg.etcDir;
+
+in
+out
+
+
+
+
+
+
+
+
+
+
+
+#let
+#  inherit (lib) mkIf mkMerge;
+#
+#  cfg = config.tv.git;
+#  arg' = arg // { inherit cfg; };
+#in
+#
+## TODO unify logging of shell scripts to user and journal
+## TODO move all scripts to ${etcDir}, so ControlMaster connections
+##       immediately pick up new authenticators
+## TODO when authorized_keys changes, then restart ssh
+##       (or kill already connected users somehow)
+#
+#{
+#  imports = [
+#    ../../3modules/tv/nginx.nix
+#  ];
+#
+#  options.tv.git = import ./options.nix arg';
+#
+#  config = mkIf cfg.enable (mkMerge [
+#    (import ./config.nix arg')
+#    (mkIf cfg.cgit (import ./cgit.nix arg'))
+#  ]);
+#}
diff --git a/3modules/tv/identity.nix b/3modules/tv/identity.nix
new file mode 100644
index 000000000..7cf90de01
--- /dev/null
+++ b/3modules/tv/identity.nix
@@ -0,0 +1,71 @@
+{ lib, ... }:
+
+with lib;
+
+let
+
+  cfg = config.tv.identity;
+
+  out = {
+    options.tv.identity = api;
+    #config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+    self = mkOption {
+      type = types.unspecified;
+    };
+    hosts = mkOption {
+      type = with types; attrsOf unspecified;
+      default = {
+        cd = {
+          #dc = "cac";
+          dc = "tv";
+          fqdn = "cd.retiolum";
+          addr = "10.243.113.222";
+          #addr6 = "42:4522:25f8:36bb:8ccb:0150:231a:2af3";
+          #internet-addr = "162.219.5.183";
+          cores = 2;
+        };
+        mkdir = {
+          #dc = "cac";
+          dc = "tv";
+          fqdn = "mkdir.retiolum";
+          addr = "10.243.113.223";
+          cores = 1;
+        };
+        nomic = {
+          #dc = "gg";
+          dc = "tv";
+          fqdn = "nomic.retiolum";
+          addr = "10.243.0.110";
+          cores = 2;
+        };
+        rmdir = {
+          #dc = "cac";
+          dc = "tv";
+          fqdn = "rmdir.retiolum";
+          addr = "10.243.113.224";
+          #addr = "42:4522:25f8:36bb:8ccb:0150:231a:2af5";
+          cores = 1;
+        };
+        wu = {
+          #dc = "gg";
+          dc = "tv";
+          fqdn = "wu.retiolum";
+          addr = "10.243.13.37";
+          cores = 8;
+        };
+      };
+    };
+  };
+
+  #imp = {
+  #};
+
+in
+out
diff --git a/3modules/tv/iptables.nix b/3modules/tv/iptables.nix
new file mode 100644
index 000000000..096b04e1d
--- /dev/null
+++ b/3modules/tv/iptables.nix
@@ -0,0 +1,129 @@
+{ config, lib, pkgs, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.iptables;
+
+  out = {
+    options.tv.iptables = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+
+    input-internet-accept-new-tcp = mkOption {
+      type = with types; listOf str;
+      default = [];
+    };
+
+    input-retiolum-accept-new-tcp = mkOption {
+      type = with types; listOf str;
+      default = [];
+    };
+  };
+
+  imp = {
+    networking.firewall.enable = false;
+
+    systemd.services.tv-iptables = {
+      description = "tv-iptables";
+      wantedBy = [ "network-pre.target" ];
+      before = [ "network-pre.target" ];
+      after = [ "systemd-modules-load.service" ];
+
+      path = with pkgs; [
+        iptables
+      ];
+      
+      restartIfChanged = true;
+      
+      serviceConfig = {
+        Type = "simple";
+        RemainAfterExit = true;
+        Restart = "always";
+        ExecStart = "@${startScript} tv-iptables_start";
+      };
+    };
+  };
+
+
+  accept-new-tcp = port:
+    "-p tcp -m tcp --dport ${port} -m conntrack --ctstate NEW -j ACCEPT";
+
+  rules = iptables-version:
+    pkgs.writeText "tv-iptables-rules${toString iptables-version}" ''
+      *nat
+      :PREROUTING ACCEPT [0:0]
+      :INPUT ACCEPT [0:0]
+      :OUTPUT ACCEPT [0:0]
+      :POSTROUTING ACCEPT [0:0]
+      ${concatMapStringsSep "\n" (rule: "-A PREROUTING ${rule}") ([]
+        ++ [
+          "! -i retiolum -p tcp -m tcp --dport 22 -j REDIRECT --to-ports 0"
+          "-p tcp -m tcp --dport 11423 -j REDIRECT --to-ports 22"
+        ]
+      )}
+      COMMIT
+      *filter
+      :INPUT DROP [0:0]
+      :FORWARD DROP [0:0]
+      :OUTPUT ACCEPT [0:0]
+      :Retiolum - [0:0]
+      ${concatMapStringsSep "\n" (rule: "-A INPUT ${rule}") ([]
+        ++ [
+          "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT"
+          "-i lo -j ACCEPT"
+        ]
+        ++ map accept-new-tcp cfg.input-internet-accept-new-tcp
+        ++ ["-i retiolum -j Retiolum"]
+      )}
+      ${concatMapStringsSep "\n" (rule: "-A Retiolum ${rule}") ([]
+        ++ {
+          ip4tables = [
+            "-p icmp -m icmp --icmp-type echo-request -j ACCEPT"
+          ];
+          ip6tables = [
+            "-p ipv6-icmp -m icmp6 --icmpv6-type echo-request -j ACCEPT"
+          ];
+        }."ip${toString iptables-version}tables"
+        ++ map accept-new-tcp cfg.input-retiolum-accept-new-tcp
+        ++ {
+          ip4tables = [
+            "-p tcp -j REJECT --reject-with tcp-reset"
+            "-p udp -j REJECT --reject-with icmp-port-unreachable"
+            "-j REJECT --reject-with icmp-proto-unreachable"
+          ];
+          ip6tables = [
+            "-p tcp -j REJECT --reject-with tcp-reset"
+            "-p udp -j REJECT --reject-with icmp6-port-unreachable"
+            "-j REJECT"
+          ];
+        }."ip${toString iptables-version}tables"
+      )}
+      COMMIT
+    '';
+
+  startScript = pkgs.writeScript "tv-iptables_start" ''
+    #! /bin/sh
+    set -euf
+    iptables-restore < ${rules 4}
+    ip6tables-restore < ${rules 6}
+  '';
+
+in
+out
+
+#let
+#  cfg = config.tv.iptables;
+#  arg' = arg // { inherit cfg; };
+#in
+#
+#{
+#  options.tv.iptables = import ./options.nix arg';
+#  config = lib.mkIf cfg.enable (import ./config.nix arg');
+#}
diff --git a/3modules/tv/nginx.nix b/3modules/tv/nginx.nix
new file mode 100644
index 000000000..d9d95be84
--- /dev/null
+++ b/3modules/tv/nginx.nix
@@ -0,0 +1,83 @@
+{ config, pkgs, lib, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.nginx;
+
+  out = {
+    options.tv.nginx = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Enable nginx.";
+    };
+
+    retiolum-locations = mkOption {
+      type = with types; listOf (attrsOf str);
+      default = [];
+    };
+  };
+
+  imp = {
+    services.nginx =
+      let
+        name = config.tv.retiolum.name;
+        qname = "${name}.retiolum";
+      in
+      assert config.tv.retiolum.enable;
+      {
+        enable = true;
+        httpConfig = ''
+          include           ${pkgs.nginx}/conf/mime.types;
+          default_type      application/octet-stream;
+          sendfile          on;
+          keepalive_timeout 65;
+          gzip              on;
+          server {
+            listen 80 default_server;
+            server_name _;
+            location / {
+              return 404;
+            }
+          }
+          server {
+            listen 80;
+            server_name ${name} ${qname};
+
+            ${indent (concatStrings (map to-location cfg.retiolum-locations))}
+
+            location / {
+              return 404;
+            }
+          }
+        '';
+      };
+  };
+
+  
+  indent = replaceChars ["\n"] ["\n  "];
+
+  to-location = { name, value }: ''
+    location ${name} {
+      ${indent value}
+    }
+  '';
+
+in
+out
+
+
+#let
+#  cfg = config.tv.nginx;
+#  arg' = arg // { inherit cfg; };
+#in
+#
+#{
+#  options.tv.nginx = import ./options.nix arg';
+#  config = lib.mkIf cfg.enable (import ./config.nix arg');
+#}
diff --git a/3modules/tv/retiolum.nix b/3modules/tv/retiolum.nix
new file mode 100644
index 000000000..7c78d7124
--- /dev/null
+++ b/3modules/tv/retiolum.nix
@@ -0,0 +1,241 @@
+{ config, pkgs, lib, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.tv.retiolum;
+
+  out = {
+    options.tv.retiolum = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Enable tinc daemon for Retiolum.";
+    };
+
+    name = mkOption {
+      type = types.str;
+      default = config.networking.hostName;
+      # Description stolen from tinc.conf(5).
+      description = ''
+        This is the name which identifies this tinc daemon.  It must
+        be unique for the virtual private network this daemon will
+        connect to.  The Name may only consist of alphanumeric and
+        underscore characters.  If Name starts with a $, then the
+        contents of the environment variable that follows will be
+        used.  In that case, invalid characters will be converted to
+        underscores.  If Name is $HOST, but no such environment
+        variable exist, the hostname will be read using the
+        gethostnname() system call This is the name which identifies
+        the this tinc daemon.
+      '';
+    };
+
+    generateEtcHosts = mkOption {
+      type = types.str;
+      default = "both";
+      description = ''
+        If set to <literal>short</literal>, <literal>long</literal>, or <literal>both</literal>,
+        then generate entries in <filename>/etc/hosts</filename> from subnets.
+      '';
+    };
+
+    network = mkOption {
+      type = types.str;
+      default = "retiolum";
+      description = ''
+        The tinc network name.
+        It is used to generate long host entries,
+        derive the name of the user account under which tincd runs,
+        and name the TUN device.
+      '';
+    };
+
+    tincPackage = mkOption {
+      type = types.package;
+      default = pkgs.tinc;
+      description = "Tincd package to use.";
+    };
+
+    hosts = mkOption {
+      default = null;
+      description = ''
+        Hosts package or path to use.
+        If a path is given, then it will be used to generate an ad-hoc package.
+      '';
+    };
+
+    iproutePackage = mkOption {
+      type = types.package;
+      default = pkgs.iproute;
+      description = "Iproute2 package to use.";
+    };
+
+
+    privateKeyFile = mkOption {
+      # TODO if it's types.path then it gets copied to /nix/store with
+      #      bad unsafe permissions...
+      type = types.str;
+      default = "/root/src/secrets/retiolum.rsa_key.priv";
+      description = "Generate file with <literal>tincd -K</literal>.";
+    };
+
+    connectTo = mkOption {
+      type = types.listOf types.str;
+      default = [ "fastpoke" "pigstarter" "kheurop" ];
+      description = "TODO describe me";
+    };
+
+  };
+
+  imp = {
+    environment.systemPackages = [ tinc hosts iproute ];
+
+    networking.extraHosts = retiolumExtraHosts;
+
+    systemd.services.retiolum = {
+      description = "Tinc daemon for Retiolum";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = [ tinc iproute ];
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        PrivateTmp = "true";
+        Restart = "always";
+        # TODO we cannot chroot (-R) b/c we use symlinks to hosts
+        #      and the private key.
+        ExecStartPre = pkgs.writeScript "retiolum-init" ''