%%%---------------------------------------------------------------------- %%% File : ejabberd_service.erl %%% Author : Alexey Shchepin %%% Purpose : External component management (XEP-0114) %%% Created : 6 Dec 2002 by Alexey Shchepin %%% %%% %%% ejabberd, Copyright (C) 2002-2016 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(ejabberd_config). -author('alexey@process-one.net'). -protocol({xep, 114, '1.6'}). -define(GEN_FSM, p1_fsm). -behaviour(?GEN_FSM). %% External exports -export([start/2, start_link/2, send_text/2, send_element/2, socket_type/0, transform_listen_option/2]). -export([init/1, wait_for_stream/2, wait_for_handshake/2, stream_established/2, handle_event/3, handle_sync_event/4, code_change/4, handle_info/3, terminate/3, print_state/1, opt_type/1]). -include("ejabberd.hrl"). -include("logger.hrl"). -include("jlib.hrl"). -record(state, {socket :: ejabberd_socket:socket_state(), sockmod = ejabberd_socket :: ejabberd_socket | ejabberd_frontend_socket, streamid = <<"">> :: binary(), host_opts = dict:new() :: ?TDICT, host = <<"">> :: binary(), access :: atom(), check_from = true :: boolean()}). %-define(DBGFSM, true). -ifdef(DBGFSM). -define(FSMOPTS, [{debug, [trace]}]). -else. -define(FSMOPTS, []). -endif. -define(STREAM_HEADER, <<"">>). -define(STREAM_TRAILER, <<"">>). -define(INVALID_HEADER_ERR, <<"Invalid " "Stream Header">>). -define(INVALID_HANDSHAKE_ERR, <<"Invalid Handshake">>). -define(INVALID_XML_ERR, fxml:element_to_binary(?SERR_XML_NOT_WELL_FORMED)). -define(INVALID_NS_ERR, fxml:element_to_binary(?SERR_INVALID_NAMESPACE)). %%%---------------------------------------------------------------------- %%% API %%%---------------------------------------------------------------------- start(SockData, Opts) -> supervisor:start_child(ejabberd_service_sup, [SockData, Opts]). start_link(SockData, Opts) -> (?GEN_FSM):start_link(ejabberd_service, [SockData, Opts], fsm_limit_opts(Opts) ++ (?FSMOPTS)). socket_type() -> xml_stream. %%%---------------------------------------------------------------------- %%% Callback functions from gen_fsm %%%---------------------------------------------------------------------- %%---------------------------------------------------------------------- %% Func: init/1 %% Returns: {ok, StateName, StateData} | %% {ok, StateName, StateData, Timeout} | %% ignore | %% {stop, StopReason} %%---------------------------------------------------------------------- init([{SockMod, Socket}, Opts]) -> ?INFO_MSG("(~w) External service connected", [Socket]), Access = case lists:keysearch(access, 1, Opts) of {value, {_, A}} -> A; _ -> all end, HostOpts = case lists:keyfind(hosts, 1, Opts) of {hosts, HOpts} -> lists:foldl( fun({H, Os}, D) -> P = proplists:get_value( password, Os, p1_sha:sha(crypto:rand_bytes(20))), dict:store(H, P, D) end, dict:new(), HOpts); false -> Pass = proplists:get_value( password, Opts, p1_sha:sha(crypto:rand_bytes(20))), dict:from_list([{global, Pass}]) end, Shaper = case lists:keysearch(shaper_rule, 1, Opts) of {value, {_, S}} -> S; _ -> none end, CheckFrom = case lists:keysearch(service_check_from, 1, Opts) of {value, {_, CF}} -> CF; _ -> true end, SockMod:change_shaper(Socket, Shaper), {ok, wait_for_stream, #state{socket = Socket, sockmod = SockMod, streamid = new_id(), host_opts = HostOpts, access = Access, check_from = CheckFrom}}. %%---------------------------------------------------------------------- %% Func: StateName/2 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- wait_for_stream({xmlstreamstart, _Name, Attrs}, StateData) -> case fxml:get_attr_s(<<"xmlns">>, Attrs) of <<"jabber:component:accept">> -> To = fxml:get_attr_s(<<"to">>, Attrs), Host = jid:nameprep(To), if Host == error -> Header = io_lib:format(?STREAM_HEADER, [<<"none">>, ?MYNAME]), send_text(StateData, <<(list_to_binary(Header))/binary, (?INVALID_XML_ERR)/binary, (?STREAM_TRAILER)/binary>>), {stop, normal, StateData}; true -> Header = io_lib:format(?STREAM_HEADER, [StateData#state.streamid, fxml:crypt(To)]), send_text(StateData, Header), HostOpts = case dict:is_key(Host, StateData#state.host_opts) of true -> StateData#state.host_opts; false -> case dict:find(global, StateData#state.host_opts) of {ok, GlobalPass} -> dict:from_list([{Host, GlobalPass}]); error -> StateData#state.host_opts end end, {next_state, wait_for_handshake, StateData#state{host = Host, host_opts = HostOpts}} end; _ -> send_text(StateData, ?INVALID_HEADER_ERR), {stop, normal, StateData} end; wait_for_stream({xmlstreamerror, _}, StateData) -> Header = io_lib:format(?STREAM_HEADER, [<<"none">>, ?MYNAME]), send_text(StateData, <<(list_to_binary(Header))/binary, (?INVALID_XML_ERR)/binary, (?STREAM_TRAILER)/binary>>), {stop, normal, StateData}; wait_for_stream(closed, StateData) -> {stop, normal, StateData}. wait_for_handshake({xmlstreamelement, El}, StateData) -> #xmlel{name = Name, children = Els} = El, case {Name, fxml:get_cdata(Els)} of {<<"handshake">>, Digest} -> case dict:find(StateData#state.host, StateData#state.host_opts) of {ok, Password} -> case p1_sha:sha(<<(StateData#state.streamid)/binary, Password/binary>>) of Digest -> send_text(StateData, <<"">>), lists:foreach( fun (H) -> ejabberd_router:register_route(H, ?MYNAME), ?INFO_MSG("Route registered for service ~p~n", [H]), ejabberd_hooks:run(component_connected, [H]) end, dict:fetch_keys(StateData#state.host_opts)), {next_state, stream_established, StateData}; _ -> send_text(StateData, ?INVALID_HANDSHAKE_ERR), {stop, normal, StateData} end; _ -> send_text(StateData, ?INVALID_HANDSHAKE_ERR), {stop, normal, StateData} end; _ -> {next_state, wait_for_handshake, StateData} end; wait_for_handshake({xmlstreamend, _Name}, StateData) -> {stop, normal, StateData}; wait_for_handshake({xmlstreamerror, _}, StateData) -> send_text(StateData, <<(?INVALID_XML_ERR)/binary, (?STREAM_TRAILER)/binary>>), {stop, normal, StateData}; wait_for_handshake(closed, StateData) -> {stop, normal, StateData}. stream_established({xmlstreamelement, El}, StateData) -> NewEl = jlib:remove_attr(<<"xmlns">>, El), #xmlel{name = Name, attrs = Attrs} = NewEl, From = fxml:get_attr_s(<<"from">>, Attrs), FromJID = case StateData#state.check_from of %% 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. false -> jid:from_string(From); %% The default is the standard behaviour in XEP-0114 _ -> FromJID1 = jid:from_string(From), case FromJID1 of #jid{lserver = Server} -> case dict:is_key(Server, StateData#state.host_opts) of true -> FromJID1; false -> error end; _ -> error end end, To = fxml:get_attr_s(<<"to">>, Attrs), ToJID = case To of <<"">> -> error; _ -> jid:from_string(To) end, if ((Name == <<"iq">>) or (Name == <<"message">>) or (Name == <<"presence">>)) and (ToJID /= error) and (FromJID /= error) -> ejabberd_router:route(FromJID, ToJID, NewEl); true -> Lang = fxml:get_tag_attr_s(<<"xml:lang">>, El), Txt = <<"Incorrect stanza name or from/to JID">>, Err = jlib:make_error_reply(NewEl, ?ERRT_BAD_REQUEST(Lang, Txt)), send_element(StateData, Err), error end, {next_state, stream_established, StateData}; stream_established({xmlstreamend, _Name}, StateData) -> {stop, normal, StateData}; stream_established({xmlstreamerror, _}, StateData) -> send_text(StateData, <<(?INVALID_XML_ERR)/binary, (?STREAM_TRAILER)/binary>>), {stop, normal, StateData}; stream_established(closed, StateData) -> {stop, normal, StateData}. %%---------------------------------------------------------------------- %% Func: StateName/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- %state_name(Event, From, StateData) -> % Reply = ok, % {reply, Reply, state_name, StateData}. %%---------------------------------------------------------------------- %% Func: handle_event/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- handle_event(_Event, StateName, StateData) -> {next_state, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: handle_sync_event/4 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- handle_sync_event(_Event, _From, StateName, StateData) -> Reply = ok, {reply, Reply, StateName, StateData}. code_change(_OldVsn, StateName, StateData, _Extra) -> {ok, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: handle_info/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- handle_info({send_text, Text}, StateName, StateData) -> send_text(StateData, Text), {next_state, StateName, StateData}; handle_info({send_element, El}, StateName, StateData) -> send_element(StateData, El), {next_state, StateName, StateData}; handle_info({route, From, To, Packet}, StateName, StateData) -> case acl:match_rule(global, StateData#state.access, From) of allow -> #xmlel{name = Name, attrs = Attrs, children = Els} = Packet, Attrs2 = jlib:replace_from_to_attrs(jid:to_string(From), jid:to_string(To), Attrs), Text = fxml:element_to_binary(#xmlel{name = Name, attrs = Attrs2, children = Els}), send_text(StateData, Text); deny -> Lang = fxml:get_tag_attr_s(<<"xml:lang">>, Packet), Txt = <<"Denied by ACL">>, Err = jlib:make_error_reply(Packet, ?ERRT_NOT_ALLOWED(Lang, Txt)), ejabberd_router:route_error(To, From, Err, Packet) end, {next_state, StateName, StateData}; handle_info(Info, StateName, StateData) -> ?ERROR_MSG("Unexpected info: ~p", [Info]), {next_state, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: terminate/3 %% Purpose: Shutdown the fsm %% Returns: any %%---------------------------------------------------------------------- terminate(Reason, StateName, StateData) -> ?INFO_MSG("terminated: ~p", [Reason]), case StateName of stream_established -> lists:foreach(fun (H) -> ejabberd_router:unregister_route(H), ejabberd_hooks:run(component_disconnected, [StateData#state.host, Reason]) end, dict:fetch_keys(StateData#state.host_opts)); _ -> ok end, (StateData#state.sockmod):close(StateData#state.socket), ok. %%---------------------------------------------------------------------- %% Func: print_state/1 %% Purpose: Prepare the state to be printed on error log %% Returns: State to print %%---------------------------------------------------------------------- print_state(State) -> State. %%%---------------------------------------------------------------------- %%% Internal functions %%%---------------------------------------------------------------------- send_text(StateData, Text) -> (StateData#state.sockmod):send(StateData#state.socket, Text). send_element(StateData, El) -> send_text(StateData, fxml:element_to_binary(El)). new_id() -> randoms:get_string(). transform_listen_option({hosts, Hosts, O}, Opts) -> case lists:keyfind(hosts, 1, Opts) of {_, PrevHostOpts} -> NewHostOpts = lists:foldl( fun(H, Acc) -> dict:append_list(H, O, Acc) end, dict:from_list(PrevHostOpts), Hosts), [{hosts, dict:to_list(NewHostOpts)}| lists:keydelete(hosts, 1, Opts)]; _ -> [{hosts, [{H, O} || H <- Hosts]}|Opts] end; transform_listen_option({host, Host, Os}, Opts) -> transform_listen_option({hosts, [Host], Os}, Opts); transform_listen_option(Opt, Opts) -> [Opt|Opts]. fsm_limit_opts(Opts) -> case lists:keysearch(max_fsm_queue, 1, Opts) of {value, {_, N}} when is_integer(N) -> [{max_queue, N}]; _ -> case ejabberd_config:get_option( max_fsm_queue, fun(I) when is_integer(I), I > 0 -> I end) of undefined -> []; N -> [{max_queue, N}] end end. opt_type(max_fsm_queue) -> fun (I) when is_integer(I), I > 0 -> I end; opt_type(_) -> [max_fsm_queue].