%%%-------------------------------------------------------------------
%%% Created : 11 Dec 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2020 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%-------------------------------------------------------------------
-module(ejabberd_service).
-behaviour(xmpp_stream_in).
-behaviour(ejabberd_listener).
-protocol({xep, 114, '1.6'}).
%% ejabberd_listener callbacks
-export([start/3, start_link/3, stop/0, accept/1]).
-export([listen_opt_type/1, listen_options/0]).
%% xmpp_stream_in callbacks
-export([init/1, handle_info/2, terminate/2, code_change/3]).
-export([handle_stream_start/2, handle_auth_success/4, handle_auth_failure/4,
handle_authenticated_packet/2, get_password_fun/1, tls_options/1]).
%% API
-export([send/2, close/1, close/2, stop_async/1]).
-include_lib("xmpp/include/xmpp.hrl").
-include("logger.hrl").
-include("translate.hrl").
-type state() :: xmpp_stream_in:state().
-export_type([state/0]).
%%%===================================================================
%%% API
%%%===================================================================
start(SockMod, Socket, Opts) ->
xmpp_stream_in:start(?MODULE, [{SockMod, Socket}, Opts],
ejabberd_config:fsm_limit_opts(Opts)).
start_link(SockMod, Socket, Opts) ->
xmpp_stream_in:start_link(?MODULE, [{SockMod, Socket}, Opts],
ejabberd_config:fsm_limit_opts(Opts)).
-spec stop() -> ok.
stop() ->
Err = xmpp:serr_system_shutdown(),
lists:foreach(
fun({_Id, Pid, _Type, _Module}) ->
send(Pid, Err),
stop_async(Pid),
supervisor:terminate_child(ejabberd_service_sup, Pid)
end, supervisor:which_children(ejabberd_service_sup)),
_ = supervisor:terminate_child(ejabberd_sup, ejabberd_service_sup),
_ = supervisor:delete_child(ejabberd_sup, ejabberd_service_sup),
ok.
accept(Ref) ->
xmpp_stream_in:accept(Ref).
-spec send(pid(), xmpp_element()) -> ok;
(state(), xmpp_element()) -> state().
send(Stream, Pkt) ->
xmpp_stream_in:send(Stream, Pkt).
-spec close(pid()) -> ok;
(state()) -> state().
close(Ref) ->
xmpp_stream_in:close(Ref).
-spec close(pid(), atom()) -> ok.
close(Ref, Reason) ->
xmpp_stream_in:close(Ref, Reason).
-spec stop_async(pid()) -> ok.
stop_async(Pid) ->
xmpp_stream_in:stop_async(Pid).
%%%===================================================================
%%% xmpp_stream_in callbacks
%%%===================================================================
tls_options(#{tls_options := TLSOptions}) ->
TLSOptions.
init([State, Opts]) ->
Access = proplists:get_value(access, Opts, all),
Shaper = proplists:get_value(shaper, Opts,
proplists:get_value(shaper_rule, Opts, none)),
GlobalPassword = proplists:get_value(password, Opts, random_password()),
HostOpts = proplists:get_value(hosts, Opts, [{global, GlobalPassword}]),
HostOpts1 = lists:map(
fun({Host, undefined}) -> {Host, GlobalPassword};
({Host, Password}) -> {Host, Password}
end, HostOpts),
CheckFrom = proplists:get_value(check_from, Opts, true),
TLSOpts1 = lists:filter(
fun({certfile, _}) -> true;
({ciphers, _}) -> true;
({dhfile, _}) -> true;
({cafile, _}) -> true;
({protocol_options, _}) -> true;
(_) -> false
end, Opts),
TLSOpts = case proplists:get_bool(tls_compression, Opts) of
false -> [compression_none | TLSOpts1];
true -> TLSOpts1
end,
GlobalRoutes = proplists:get_value(global_routes, Opts, true),
Timeout = ejabberd_option:negotiation_timeout(),
State1 = xmpp_stream_in:change_shaper(State, ejabberd_shaper:new(Shaper)),
State2 = xmpp_stream_in:set_timeout(State1, Timeout),
State3 = State2#{access => Access,
xmlns => ?NS_COMPONENT,
lang => ejabberd_option:language(),
server => ejabberd_config:get_myname(),
host_opts => maps:from_list(HostOpts1),
stream_version => undefined,
tls_options => TLSOpts,
global_routes => GlobalRoutes,
check_from => CheckFrom},
ejabberd_hooks:run_fold(component_init, {ok, State3}, [Opts]).
handle_stream_start(_StreamStart,
#{remote_server := RemoteServer,
lang := Lang,
host_opts := HostOpts} = State) ->
case ejabberd_router:is_my_host(RemoteServer) of
true ->
Txt = ?T("Unable to register route on existing local domain"),
xmpp_stream_in:send(State, xmpp:serr_conflict(Txt, Lang));
false ->
NewHostOpts = case maps:is_key(RemoteServer, HostOpts) of
true ->
HostOpts;
false ->
case maps:find(global, HostOpts) of
{ok, GlobalPass} ->
maps:from_list([{RemoteServer, GlobalPass}]);
error ->
HostOpts
end
end,
CodecOpts = ejabberd_config:codec_options(),
State#{host_opts => NewHostOpts, codec_options => CodecOpts}
end.
get_password_fun(#{remote_server := RemoteServer,
socket := Socket, ip := IP,
host_opts := HostOpts}) ->
fun(_) ->
case maps:find(RemoteServer, HostOpts) of
{ok, Password} ->
{Password, undefined};
error ->
?WARNING_MSG("(~ts) Domain ~ts is unconfigured for "
"external component from ~ts",
[xmpp_socket:pp(Socket), RemoteServer,
ejabberd_config:may_hide_data(misc:ip_to_list(IP))]),
{false, undefined}
end
end.
handle_auth_success(_, Mech, _,
#{remote_server := RemoteServer, host_opts := HostOpts,
socket := Socket, ip := IP,
global_routes := GlobalRoutes} = State) ->
?INFO_MSG("(~ts) Accepted external component ~ts authentication "
"for ~ts from ~ts",
[xmpp_socket:pp(Socket), Mech, RemoteServer,
ejabberd_config:may_hide_data(misc:ip_to_list(IP))]),
Routes = if GlobalRoutes ->
maps:keys(HostOpts);
true ->
[RemoteServer]
end,
lists:foreach(
fun(H) ->
ejabberd_router:register_route(H, ejabberd_config:get_myname()),
ejabberd_hooks:run(component_connected, [H])
end, Routes),
State#{routes => Routes}.
handle_auth_failure(_, Mech, Reason,
#{remote_server := RemoteServer,
socket := Socket, ip := IP} = State) ->
?WARNING_MSG("(~ts) Failed external component ~ts authentication "
"for ~ts from ~ts: ~ts",
[xmpp_socket:pp(Socket), Mech, RemoteServer,
ejabberd_config:may_hide_data(misc:ip_to_list(IP)),
Reason]),
State.
handle_authenticated_packet(Pkt0, #{ip := {IP, _}, lang := Lang} = State)
when ?is_stanza(Pkt0) ->
Pkt = xmpp:put_meta(Pkt0, ip, IP),
From = xmpp:get_from(Pkt),
case check_from(From, State) of
true ->
{Pkt2, State2} = ejabberd_hooks:run_fold(component_send_packet, {Pkt, State}, []),
case Pkt2 of
drop ->
ok;
_ ->
ejabberd_router:route(Pkt2)
end,
State2;
false ->
Txt = ?T("Improper domain part of 'from' attribute"),
Err = xmpp:serr_invalid_from(Txt, Lang),
xmpp_stream_in:send(State, Err)
end;
handle_authenticated_packet(_Pkt, State) ->
State.
handle_info({route, Packet}, #{access := Access} = State) ->
case acl:match_rule(global, Access, xmpp:get_from(Packet)) of
allow ->
xmpp_stream_in:send(State, Packet);
deny ->
Lang = xmpp:get_lang(Packet),
Err = xmpp:err_not_allowed(?T("Access denied by service policy"), Lang),
ejabberd_router:route_error(Packet, Err),
State
end;
handle_info(Info, State) ->
?ERROR_MSG("Unexpected info: ~p", [Info]),
State.
terminate(Reason, #{routes := Routes}) ->
lists:foreach(
fun(H) ->
ejabberd_router:unregister_route(H),
ejabberd_hooks:run(component_disconnected, [H, Reason])
end, Routes);
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec check_from(jid(), state()) -> boolean().
check_from(_From, #{check_from := false}) ->
%% If the admin does not want to check the from field
%% when accept packets from any address.
%% In this case, the component can send packet of
%% behalf of the server users.
true;
check_from(From, #{host_opts := HostOpts}) ->
%% The default is the standard behaviour in XEP-0114
Server = From#jid.lserver,
maps:is_key(Server, HostOpts).
random_password() ->
str:sha(p1_rand:bytes(20)).
listen_opt_type(shaper_rule) ->
econf:and_then(
econf:shaper(),
fun(S) ->
?WARNING_MSG("Listening option 'shaper_rule' of module ~ts "
"is renamed to 'shaper'. Please adjust your "
"configuration", [?MODULE]),
S
end);
listen_opt_type(check_from) ->
econf:bool();
listen_opt_type(password) ->
econf:binary();
listen_opt_type(hosts) ->
econf:map(
econf:domain(),
econf:and_then(
econf:options(
#{password => econf:binary()}),
fun(Opts) -> proplists:get_value(password, Opts) end));
listen_opt_type(global_routes) ->
econf:bool().
listen_options() ->
[{access, all},
{shaper, none},
{shaper_rule, none},
{certfile, undefined},
{ciphers, undefined},
{dhfile, undefined},
{cafile, undefined},
{protocol_options, undefined},
{tls, false},
{tls_compression, false},
{max_stanza_size, infinity},
{max_fsm_queue, 10000},
{password, undefined},
{hosts, []},
{check_from, true},
{global_routes, true}].
