Merge remote-tracking branch 'cd/master'

7 files changed, 786 insertions, 166 deletions

diff --git a/tv/3modules/charybdis/config.nix b/tv/3modules/charybdis/config.nix
new file mode 100644
index 000000000..e4d754ff3
--- /dev/null
+++ b/tv/3modules/charybdis/config.nix
@@ -0,0 +1,522 @@
+{ config, ... }: with config.krebs.lib; let
+  cfg = config.tv.charybdis;
+in toFile "charybdis.conf" ''
+  /* doc/example.conf - brief example configuration file
+   *
+   * Copyright (C) 2000-2002 Hybrid Development Team
+   * Copyright (C) 2002-2005 ircd-ratbox development team
+   * Copyright (C) 2005-2006 charybdis development team
+   *
+   * $Id: example.conf 3582 2007-11-17 21:55:48Z jilles $
+   *
+   * See reference.conf for more information.
+   */
+
+  /* Extensions */
+  #loadmodule "extensions/chm_operonly_compat.so";
+  #loadmodule "extensions/chm_quietunreg_compat.so";
+  #loadmodule "extensions/chm_sslonly_compat.so";
+  #loadmodule "extensions/createauthonly.so";
+  #loadmodule "extensions/extb_account.so";
+  #loadmodule "extensions/extb_canjoin.so";
+  #loadmodule "extensions/extb_channel.so";
+  #loadmodule "extensions/extb_extgecos.so";
+  #loadmodule "extensions/extb_oper.so";
+  #loadmodule "extensions/extb_realname.so";
+  #loadmodule "extensions/extb_server.so";
+  #loadmodule "extensions/extb_ssl.so";
+  #loadmodule "extensions/hurt.so";
+  #loadmodule "extensions/m_findforwards.so";
+  #loadmodule "extensions/m_identify.so";
+  #loadmodule "extensions/no_oper_invis.so";
+  #loadmodule "extensions/sno_farconnect.so";
+  #loadmodule "extensions/sno_globalkline.so";
+  #loadmodule "extensions/sno_globaloper.so";
+  #loadmodule "extensions/sno_whois.so";
+  loadmodule "extensions/override.so";
+
+  /*
+   * IP cloaking extensions: use ip_cloaking_4.0
+   * if you're linking 3.2 and later, otherwise use
+   * ip_cloaking.so, for compatibility with older 3.x
+   * releases.
+   */
+
+  #loadmodule "extensions/ip_cloaking_4.0.so";
+  #loadmodule "extensions/ip_cloaking.so";
+
+  serverinfo {
+    name = ${toJSON (head config.krebs.build.host.nets.retiolum.aliases)};
+    sid = "4z3";
+    description = "miep!";
+    network_name = "irc.retiolum";
+    #network_desc = "Retiolum IRC Network";
+    hub = yes;
+
+    /* On multi-homed hosts you may need the following. These define
+     * the addresses we connect from to other servers. */
+    /* for IPv4 */
+    vhost = ${concatMapStringsSep ", " toJSON config.krebs.build.host.nets.retiolum.addrs4};
+    /* for IPv6 */
+    vhost6 = ${concatMapStringsSep ", " toJSON config.krebs.build.host.nets.retiolum.addrs6};
+
+    /* ssl_private_key: our ssl private key */
+    ssl_private_key = ${toJSON cfg.ssl_private_key.path};
+
+    /* ssl_cert: certificate for our ssl server */
+    ssl_cert = ${toJSON cfg.ssl_cert};
+
+    /* ssl_dh_params: DH parameters, generate with openssl dhparam -out dh.pem 1024 */
+    ssl_dh_params = ${toJSON cfg.ssl_dh_params.path};
+
+    /* ssld_count: number of ssld processes you want to start, if you
+     * have a really busy server, using N-1 where N is the number of
+     * cpu/cpu cores you have might be useful. A number greater than one
+     * can also be useful in case of bugs in ssld and because ssld needs
+     * two file descriptors per SSL connection.
+     */
+    ssld_count = 1;
+
+    /* default max clients: the default maximum number of clients
+     * allowed to connect.  This can be changed once ircd has started by
+     * issuing:
+     *   /quote set maxclients <limit>
+     */
+    default_max_clients = 1024;
+
+    /* nicklen: enforced nickname length (for this server only; must not
+     * be longer than the maximum length set while building).
+     */
+    nicklen = 30;
+  };
+
+  admin {
+    name = "tv";
+    description = "peer";
+  };
+
+  log {
+    fname_userlog = "/dev/stderr";
+    fname_fuserlog = "/dev/stderr";
+    fname_operlog = "/dev/stderr";
+    fname_foperlog = "/dev/stderr";
+    fname_serverlog = "/dev/stderr";
+    fname_klinelog = "/dev/stderr";
+    fname_killlog = "/dev/stderr";
+    fname_operspylog = "/dev/stderr";
+    fname_ioerrorlog = "/dev/stderr";
+  };
+
+  /* class {} blocks MUST be specified before anything that uses them.  That
+   * means they must be defined before auth {} and before connect {}.
+   */
+
+  class "krebs" {
+    ping_time = 2 minutes;
+    number_per_ident = 10;
+    number_per_ip = 2048;
+    number_per_ip_global = 4096;
+    cidr_ipv4_bitlen = 24;
+    cidr_ipv6_bitlen = 64;
+    number_per_cidr = 65536;
+    max_number = 3000;
+    sendq = 1 megabyte;
+  };
+
+  class "users" {
+    ping_time = 2 minutes;
+    number_per_ident = 10;
+    number_per_ip = 1024;
+    number_per_ip_global = 4096;
+    cidr_ipv4_bitlen = 24;
+    cidr_ipv6_bitlen = 64;
+    number_per_cidr = 65536;
+    max_number = 3000;
+    sendq = 400 kbytes;
+  };
+
+  class "opers" {
+    ping_time = 5 minutes;
+    number_per_ip = 10;
+    max_number = 1000;
+    sendq = 1 megabyte;
+  };
+
+  class "server" {
+    ping_time = 5 minutes;
+    connectfreq = 5 minutes;
+    max_number = 1;
+    sendq = 4 megabytes;
+  };
+
+  listen {
+    /* defer_accept: wait for clients to send IRC handshake data before
+     * accepting them.  if you intend to use software which depends on the
+     * server replying first, such as BOPM, you should disable this feature.
+     * otherwise, you probably want to leave it on.
+     */
+    defer_accept = yes;
+
+    /* If you want to listen on a specific IP only, specify host.
+     * host definitions apply only to the following port line.
+     */
+    # XXX This is stupid because only one host is allowed[?]
+    #host = ''${concatMapStringsSep ", " toJSON (
+    #  config.krebs.build.host.nets.retiolum.addrs
+    #)};
+    port = ${toString cfg.port};
+    sslport = ${toString cfg.sslport};
+  };
+
+  /* auth {}: allow users to connect to the ircd (OLD I:)
+   * auth {} blocks MUST be specified in order of precedence.  The first one
+   * that matches a user will be used.  So place spoofs first, then specials,
+   * then general access, then restricted.
+   */
+  auth {
+    /* user: the user@host allowed to connect.  Multiple IPv4/IPv6 user
+     * lines are permitted per auth block.  This is matched against the
+     * hostname and IP address (using :: shortening for IPv6 and
+     * prepending a 0 if it starts with a colon) and can also use CIDR
+     * masks.
+     */
+    user = "*@10.243.0.0/16";
+    user = "*@42::/16";
+
+    /* password: an optional password that is required to use this block.
+     * By default this is not encrypted, specify the flag "encrypted" in
+     * flags = ...; below if it is.
+     */
+    #password = "letmein";
+
+    /* spoof: fake the users user@host to be be this.  You may either
+     * specify a host or a user@host to spoof to.  This is free-form,
+     * just do everyone a favour and dont abuse it. (OLD I: = flag)
+     */
+    #spoof = "I.still.hate.packets";
+
+    /* Possible flags in auth:
+     *
+     * encrypted                  | password is encrypted with mkpasswd
+     * spoof_notice               | give a notice when spoofing hosts
+     * exceed_limit (old > flag)  | allow user to exceed class user limits
+     * kline_exempt (old ^ flag)  | exempt this user from k/g/xlines&dnsbls
+     * dnsbl_exempt		      | exempt this user from dnsbls
+     * spambot_exempt	      | exempt this user from spambot checks
+     * shide_exempt		      | exempt this user from serverhiding
+     * jupe_exempt                | exempt this user from generating
+     *                              warnings joining juped channels
+     * resv_exempt		      | exempt this user from resvs
+     * flood_exempt               | exempt this user from flood limits
+     *                                     USE WITH CAUTION.
+     * no_tilde     (old - flag)  | don't prefix ~ to username if no ident
+     * need_ident   (old + flag)  | require ident for user in this class
+     * need_ssl                   | require SSL/TLS for user in this class
+     * need_sasl                  | require SASL id for user in this class
+     */
+    flags = kline_exempt, exceed_limit, flood_exempt;
+
+    /* class: the class the user is placed in */
+    class = "krebs";
+  };
+
+  auth {
+    user = "*@*";
+    class = "users";
+  };
+
+  /* privset {} blocks MUST be specified before anything that uses them.  That
+   * means they must be defined before operator {}.
+   */
+  privset "local_op" {
+    privs = oper:local_kill, oper:operwall;
+  };
+
+  privset "server_bot" {
+    extends = "local_op";
+    privs = oper:kline, oper:remoteban, snomask:nick_changes;
+  };
+
+  privset "global_op" {
+    extends = "local_op";
+    privs = oper:global_kill, oper:routing, oper:kline, oper:unkline, oper:xline,
+      oper:resv, oper:mass_notice, oper:remoteban;
+  };
+
+  privset "admin" {
+    extends = "global_op";
+    privs = oper:admin, oper:die, oper:rehash, oper:spy, oper:override;
+  };
+
+  privset "aids" {
+    privs = oper:override, oper:rehash;
+  };
+
+  operator "aids" {
+    user = "*@10.243.*";
+    privset = "aids";
+    flags = ~encrypted;
+    password = "balls";
+  };
+
+  operator "god" {
+    /* name: the name of the oper must go above */
+
+    /* user: the user@host required for this operator.  CIDR *is*
+     * supported now. auth{} spoofs work here, other spoofs do not.
+     * multiple user="" lines are supported.
+     */
+    user = "*god@127.0.0.1";
+
+    /* password: the password required to oper.  Unless ~encrypted is
+     * contained in flags = ...; this will need to be encrypted using
+     * mkpasswd, MD5 is supported
+     */
+    password = "5";
+
+    /* rsa key: the public key for this oper when using Challenge.
+     * A password should not be defined when this is used, see
+     * doc/challenge.txt for more information.
+     */
+    #rsa_public_key_file = "/usr/local/ircd/etc/oper.pub";
+
+    /* umodes: the specific umodes this oper gets when they oper.
+     * If this is specified an oper will not be given oper_umodes
+     * These are described above oper_only_umodes in general {};
+     */
+    #umodes = locops, servnotice, operwall, wallop;
+
+    /* fingerprint: if specified, the oper's client certificate
+     * fingerprint will be checked against the specified fingerprint
+     * below.
+     */
+    #fingerprint = "c77106576abf7f9f90cca0f63874a60f2e40a64b";
+
+    /* snomask: specific server notice mask on oper up.
+     * If this is specified an oper will not be given oper_snomask.
+     */
+    snomask = "+Zbfkrsuy";
+
+    /* flags: misc options for the operator.  You may prefix an option
+     * with ~ to disable it, e.g. ~encrypted.
+     *
+     * Default flags are encrypted.
+     *
+     * Available options:
+     *
+     * encrypted:    the password above is encrypted [DEFAULT]
+     * need_ssl:     must be using SSL/TLS to oper up
+     */
+    flags = encrypted;
+
+    /* privset: privileges set to grant */
+    privset = "admin";
+  };
+
+  service {
+    name = "services.int";
+  };
+
+  cluster {
+    name = "*";
+    flags = kline, tkline, unkline, xline, txline, unxline, resv, tresv, unresv;
+  };
+
+  shared {
+    oper = "*@*", "*";
+    flags = all, rehash;
+  };
+
+  /* exempt {}: IPs that are exempt from Dlines and rejectcache. (OLD d:) */
+  exempt {
+    ip = "127.0.0.1";
+  };
+
+  channel {
+    use_invex = yes;
+    use_except = yes;
+    use_forward = yes;
+    use_knock = yes;
+    knock_delay = 5 minutes;
+    knock_delay_channel = 1 minute;
+    max_chans_per_user = 15;
+    max_bans = 100;
+    max_bans_large = 500;
+    default_split_user_count = 0;
+    default_split_server_count = 0;
+    no_create_on_split = no;
+    no_join_on_split = no;
+    burst_topicwho = yes;
+    kick_on_split_riding = no;
+    only_ascii_channels = no;
+    resv_forcepart = yes;
+    channel_target_change = yes;
+    disable_local_channels = no;
+  };
+
+  serverhide {
+    flatten_links = yes;
+    links_delay = 5 minutes;
+    hidden = no;
+    disable_hidden = no;
+  };
+
+  /* These are the blacklist settings.
+   * You can have multiple combinations of host and rejection reasons.
+   * They are used in pairs of one host/rejection reason.
+   *
+   * These settings should be adequate for most networks, and are (presently)
+   * required for use on StaticBox.
+   *
+   * Word to the wise: Do not use blacklists like SPEWS for blocking IRC
+   * connections.
+   *
+   * As of charybdis 2.2, you can do some keyword substitution on the rejection
+   * reason. The available keyword substitutions are:
+   *
+   *   ''${ip}           - the user's IP
+   *   ''${host}         - the user's canonical hostname
+   *   ''${dnsbl-host}   - the dnsbl hostname the lookup was done against
+   *   ''${nick}         - the user's nickname
+   *   ''${network-name} - the name of the network
+   *
+   * As of charybdis 3.4, a type parameter is supported, which specifies the
+   * address families the blacklist supports. IPv4 and IPv6 are supported.
+   * IPv4 is currently the default as few blacklists support IPv6 operation
+   * as of this writing.
+   *
+   * Note: AHBL (the providers of the below *.ahbl.org BLs) request that they be
+   * contacted, via email, at admins@2mbit.com before using these BLs.
+   * See <http://www.ahbl.org/services.php> for more information.
+   */
+  blacklist {
+    host = "rbl.efnetrbl.org";
+    type = ipv4;
+    reject_reason = "''${nick}, your IP (''${ip}) is listed in EFnet's RBL. For assistance, see http://efnetrbl.org/?i=''${ip}";
+
+  #	host = "ircbl.ahbl.org";
+  #	type = ipv4;
+  #	reject_reason = "''${nick}, your IP (''${ip}) is listed in ''${dnsbl-host} for having an open proxy. In order to protect ''${network-name} from abuse, we are not allowing connections with open proxies to connect.";
+  #
+  #	host = "tor.ahbl.org";
+  #	type = ipv4;
+  #	reject_reason = "''${nick}, your IP (''${ip}) is listed as a TOR exit node. In order to protect ''${network-name} from tor-based abuse, we are not allowing TOR exit nodes to connect to our network.";
+  #
+    /* Example of a blacklist that supports both IPv4 and IPv6 */
+  #	host = "foobl.blacklist.invalid";
+  #	type = ipv4, ipv6;
+  #	reject_reason = "''${nick}, your IP (''${ip}) is listed in ''${dnsbl-host} for some reason. In order to protect ''${network-name} from abuse, we are not allowing connections listed in ''${dnsbl-host} to connect";
+  };
+
+  alias "NickServ" {
+    target = "NickServ";
+  };
+
+  alias "ChanServ" {
+    target = "ChanServ";
+  };
+
+  alias "OperServ" {
+    target = "OperServ";
+  };
+
+  alias "MemoServ" {
+    target = "MemoServ";
+  };
+
+  alias "NS" {
+    target = "NickServ";
+  };
+
+  alias "CS" {
+    target = "ChanServ";
+  };
+
+  alias "OS" {
+    target = "OperServ";
+  };
+
+  alias "MS" {
+    target = "MemoServ";
+  };
+
+  general {
+    hide_error_messages = opers;
+    hide_spoof_ips = yes;
+
+    /*
+     * default_umodes: umodes to enable on connect.
+     * If you have enabled the new ip_cloaking_4.0 module, and you want
+     * to make use of it, add +x to this option, i.e.:
+     *      default_umodes = "+ix";
+     *
+     * If you have enabled the old ip_cloaking module, and you want
+     * to make use of it, add +h to this option, i.e.:
+     *	default_umodes = "+ih";
+     */
+    default_umodes = "+i";
+
+    default_operstring = "is an IRC Operator";
+    default_adminstring = "is a Server Administrator";
+    servicestring = "is a Network Service";
+    disable_fake_channels = no;
+    tkline_expire_notices = no;
+    default_floodcount = 1000;
+    failed_oper_notice = yes;
+    dots_in_ident=2;
+    min_nonwildcard = 4;
+    min_nonwildcard_simple = 3;
+    max_accept = 100;
+    max_monitor = 100;
+    anti_nick_flood = yes;
+    max_nick_time = 20 seconds;
+    max_nick_changes = 5;
+    anti_spam_exit_message_time = 5 minutes;
+    ts_warn_delta = 30 seconds;
+    ts_max_delta = 5 minutes;
+    client_exit = yes;
+    collision_fnc = yes;
+    resv_fnc = yes;
+    global_snotices = yes;
+    dline_with_reason = yes;
+    kline_delay = 0 seconds;
+    kline_with_reason = yes;
+    kline_reason = "K-Lined";
+    identify_service = "NickServ@services.int";
+    identify_command = "IDENTIFY";
+    non_redundant_klines = yes;
+    warn_no_nline = yes;
+    use_propagated_bans = yes;
+    stats_e_disabled = no;
+    stats_c_oper_only=no;
+    stats_h_oper_only=no;
+    client_flood_max_lines = 16000;
+    client_flood_burst_rate = 32000;
+    client_flood_burst_max = 32000;
+    client_flood_message_num = 32000;
+    client_flood_message_time = 32000;
+    use_whois_actually = no;
+    oper_only_umodes = operwall, locops, servnotice;
+    oper_umodes = locops, servnotice, operwall, wallop;
+    oper_snomask = "+s";
+    burst_away = yes;
+    nick_delay = 0 seconds; # 15 minutes if you want to enable this
+    reject_ban_time = 1 minute;
+    reject_after_count = 3;
+    reject_duration = 5 minutes;
+    throttle_duration = 60;
+    throttle_count = 4;
+    max_ratelimit_tokens = 30;
+    away_interval = 30;
+    disable_auth = yes;
+  };
+
+  modules {
+    path = "modules";
+    path = "modules/autoload";
+  };
+
+  exempt {
+    ip = "10.243.0.0/16";
+  };
+''
diff --git a/tv/3modules/charybdis/default.nix b/tv/3modules/charybdis/default.nix
new file mode 100644
index 000000000..3af971cd4
--- /dev/null
+++ b/tv/3modules/charybdis/default.nix
@@ -0,0 +1,80 @@
+{ config, lib, pkgs, ... }@args: with config.krebs.lib; let
+  cfg = config.tv.charybdis;
+in {
+  options.tv.charybdis = {
+    enable = mkEnableOption "tv.charybdis";
+    motd = mkOption {
+      type = types.str;
+      default = "/join #retiolum";
+    };
+    port = mkOption {
+      type = types.int;
+      default = 6667;
+    };
+    ssl_cert = mkOption {
+      type = types.path;
+    };
+    ssl_dh_params = mkOption {
+      type = types.secret-file;
+      default = {
+        path = "${cfg.user.home}/dh.pem";
+        owner = cfg.user;
+        source-path = toString <secrets> + "/charybdis.dh.pem";
+      };
+    };
+    ssl_private_key = mkOption {
+      type = types.secret-file;
+      default = {
+        path = "${cfg.user.home}/ssl.key.pem";
+        owner = cfg.user;
+        source-path = toString <secrets> + "/charybdis.key.pem";
+      };
+    };
+    sslport = mkOption {
+      type = types.int;
+      default = 6697;
+    };
+    user = mkOption {
+      type = types.user;
+      default = {
+        name = "charybdis";
+        home = "/var/lib/charybdis";
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+
+    krebs.secret.files.charybdis-ssl_dh_params = cfg.ssl_dh_params;
+    krebs.secret.files.charybdis-ssl_private_key = cfg.ssl_private_key;
+
+    environment.etc."charybdis-ircd.motd".text = cfg.motd;
+
+    systemd.services.charybdis = {
+      wantedBy = [ "multi-user.target" ];
+      requires = [ "secret.service" ];
+      after = [ "network.target" "secret.service" ];
+      environment = {
+        BANDB_DBPATH = "${cfg.user.home}/ban.db";
+      };
+      serviceConfig = {
+        SyslogIdentifier = "charybdis";
+        User = cfg.user.name;
+        PrivateTmp = true;
+        Restart = "always";
+        ExecStartPre =
+          "${pkgs.coreutils}/bin/ln -s /etc/charybdis-ircd.motd /tmp/ircd.motd";
+        ExecStart = toString [
+          "${pkgs.charybdis}/bin/charybdis-ircd"
+            "-configfile ${import ./config.nix args}"
+            "-foreground"
+            "-logfile /dev/stderr"
+        ];
+      };
+    };
+
+    users.users.${cfg.user.name} = {
+      inherit (cfg.user) home name uid;
+      createHome = true;
+    };
+  };
+}
diff --git a/tv/3modules/default.nix b/tv/3modules/default.nix
index f7889b245..0b0bccab9 100644
--- a/tv/3modules/default.nix
+++ b/tv/3modules/default.nix
@@ -2,7 +2,8 @@ _:
 
 {
   imports = [
-    ./ejabberd.nix
+    ./charybdis
+    ./ejabberd
     ./iptables.nix
   ];
 }
diff --git a/tv/3modules/ejabberd.nix b/tv/3modules/ejabberd.nix
deleted file mode 100644
index c9d9b48b1..000000000
--- a/tv/3modules/ejabberd.nix
+++ /dev/null
@@ -1,165 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with config.krebs.lib;
-let
-  cfg = config.tv.ejabberd;
-
-  out = {
-    options.tv.ejabberd = api;
-    config = lib.mkIf cfg.enable imp;
-  };
-
-  api = {
-    enable = mkEnableOption "tv.ejabberd";
-
-    certFile = mkOption {
-      type = types.str;
-      default = toString <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;
-        ExecStartPre = pkgs.writeScript "ejabberd-start" ''
-          #! /bin/sh
-          install -o ${user.name} -m 0400 ${cfg.certFile} /etc/ejabberd/ejabberd.pem
-        '';
-        ExecStart = pkgs.writeScript "ejabberd-service" ''
-          #! /bin/sh
-          ${my-ejabberdctl}/bin/ejabberdctl start
-        '';
-      };
-    };
-
-    users.extraUsers = singleton {
-      inherit (user) name uid;
-      home = "/var/ejabberd";
-      createHome = true;
-    };
-  };
-
-  user = rec {
-    name = "ejabberd";
-    uid = genid name;
-  };
-
-  my-ejabberdctl = pkgs.writeScriptBin "ejabberdctl" ''
-    #! /bin/sh
-    set -euf
-    exec env \
-        SPOOLDIR=/var/ejabberd \
-        EJABBERD_CONFIG_PATH=${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, "/etc/ejabberd/ejabberd.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, "/etc/ejabberd/ejabberd.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/tv/3modules/ejabberd/config.nix b/tv/3modules/ejabberd/config.nix
new file mode 100644
index 000000000..49bded855
--- /dev/null
+++ b/tv/3modules/ejabberd/config.nix
@@ -0,0 +1,93 @@
+{ config, ... }: with config.krebs.lib; let
+  cfg = config.tv.ejabberd;
+
+  # XXX this is a placeholder that happens to work the default strings.
+  toErlang = builtins.toJSON;
+in toFile "ejabberd.conf" ''
+  {loglevel, 3}.
+  {hosts, ${toErlang cfg.hosts}}.
+  {listen,
+   [
+    {5222, ejabberd_c2s, [
+        starttls,
+        {certfile, ${toErlang cfg.certfile.path}},
+        {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, ${toErlang cfg.s2s_certfile.path}}.
+  {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,  []}
+   ]}.
+''
diff --git a/tv/3modules/ejabberd/default.nix b/tv/3modules/ejabberd/default.nix
new file mode 100644
index 000000000..95ea24be1
--- /dev/null
+++ b/tv/3modules/ejabberd/default.nix
@@ -0,0 +1,67 @@
+{ config, lib, pkgs, ... }@args: with config.krebs.lib; let
+  cfg = config.tv.ejabberd;
+in {
+  options.tv.ejabberd = {
+    enable = mkEnableOption "tv.ejabberd";
+    certfile = mkOption {
+      type = types.secret-file;
+      default = {
+        path = "${cfg.user.home}/ejabberd.pem";
+        owner = cfg.user;
+        source-path = toString <secrets> + "/ejabberd.pem";
+      };
+    };
+    hosts = mkOption {
+      type = with types; listOf str;
+    };
+    pkgs.ejabberdctl = mkOption {
+      type = types.package;
+      default = pkgs.writeDashBin "ejabberdctl" ''
+        set -efu
+        export SPOOLDIR=${shell.escape cfg.user.home}
+        export EJABBERD_CONFIG_PATH=${shell.escape (import ./config.nix args)}
+        exec ${pkgs.ejabberd}/bin/ejabberdctl \
+            --logs ${shell.escape cfg.user.home} \
+            "$@"
+      '';
+    };
+    s2s_certfile = mkOption {
+      type = types.secret-file;
+      default = cfg.certfile;
+    };
+    user = mkOption {
+      type = types.user;
+      default = {
+        name = "ejabberd";
+        home = "/var/ejabberd";
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.pkgs.ejabberdctl ];
+
+    krebs.secret.files = {
+      ejabberd-certfile = cfg.certfile;
+      ejabberd-s2s_certfile = cfg.s2s_certfile;
+    };
+
+    systemd.services.ejabberd = {
+      wantedBy = [ "multi-user.target" ];
+      requires = [ "secret.service" ];
+      after = [ "network.target" "secret.service" ];
+      serviceConfig = {
+        Type = "oneshot";
+        RemainAfterExit = "yes";
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "ejabberd";
+        User = cfg.user.name;
+        ExecStart = "${cfg.pkgs.ejabberdctl}/bin/ejabberdctl start";
+      };
+    };
+
+    users.users.${cfg.user.name} = {
+      inherit (cfg.user) home name uid;
+      createHome = true;
+    };
+  };
+}
diff --git a/tv/3modules/iptables.nix b/tv/3modules/iptables.nix
index c0fd7ec12..c0e71f24d 100644
--- a/tv/3modules/iptables.nix
+++ b/tv/3modules/iptables.nix
@@ -26,6 +26,21 @@ let
       type = with types; listOf (either int str);
       default = [];
     };
+
+    extra = {
+      nat.POSTROUTING = mkOption {
+        type = with types; listOf str;
+        default = [];
+      };
+      filter.FORWARD = mkOption {
+        type = with types; listOf str;
+        default = [];
+      };
+      filter.INPUT = mkOption {
+        type = with types; listOf str;
+        default = [];
+      };
+    };
   };
 
   imp = {
@@ -57,6 +72,11 @@ let
     };
   };
 
+  formatTable = table:
+    (concatStringsSep "\n"
+      (mapAttrsToList
+        (chain: concatMapStringsSep "\n" (rule: "-A ${chain} ${rule}"))
+        table));
 
   rules = iptables-version: let
     accept-echo-request = {
@@ -79,6 +99,7 @@ let
       ${concatMapStringsSep "\n" (rule: "-A OUTPUT ${rule}") [
         "-o lo -p tcp -m tcp --dport 114