mirror of
https://github.com/processone/ejabberd.git
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382 lines
12 KiB
Erlang
382 lines
12 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_service.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : External component management (XEP-0114)
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%%% Created : 6 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2008 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_service).
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-author('alexey@process-one.net').
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-behaviour(gen_fsm).
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%% External exports
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-export([start/2,
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start_link/2,
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send_text/2,
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send_element/2,
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socket_type/0]).
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%% gen_fsm callbacks
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-export([init/1,
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wait_for_stream/2,
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wait_for_handshake/2,
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stream_established/2,
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handle_event/3,
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handle_sync_event/4,
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code_change/4,
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handle_info/3,
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terminate/3]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(state, {socket, sockmod, streamid,
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hosts, password, access,
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check_from}).
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%-define(DBGFSM, true).
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-ifdef(DBGFSM).
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-define(FSMOPTS, [{debug, [trace]}]).
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-else.
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-define(FSMOPTS, []).
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-endif.
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-define(STREAM_HEADER,
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"<?xml version='1.0'?>"
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"<stream:stream "
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"xmlns:stream='http://etherx.jabber.org/streams' "
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"xmlns='jabber:component:accept' "
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"id='~s' from='~s'>"
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).
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-define(STREAM_TRAILER, "</stream:stream>").
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-define(INVALID_HEADER_ERR,
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"<stream:stream "
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"xmlns:stream='http://etherx.jabber.org/streams'>"
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"<stream:error>Invalid Stream Header</stream:error>"
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"</stream:stream>"
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).
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-define(INVALID_HANDSHAKE_ERR,
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"<stream:error>Invalid Handshake</stream:error>"
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"</stream:stream>"
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).
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-define(INVALID_XML_ERR,
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xml:element_to_string(?SERR_XML_NOT_WELL_FORMED)).
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-define(INVALID_NS_ERR,
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xml:element_to_string(?SERR_INVALID_NAMESPACE)).
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(SockData, Opts) ->
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supervisor:start_child(ejabberd_service_sup, [SockData, Opts]).
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start_link(SockData, Opts) ->
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gen_fsm:start_link(ejabberd_service, [SockData, Opts], ?FSMOPTS).
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socket_type() ->
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xml_stream.
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_fsm
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%%%----------------------------------------------------------------------
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%%----------------------------------------------------------------------
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%% Func: init/1
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%% Returns: {ok, StateName, StateData} |
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%% {ok, StateName, StateData, Timeout} |
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%% ignore |
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%% {stop, StopReason}
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%%----------------------------------------------------------------------
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init([{SockMod, Socket}, Opts]) ->
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?INFO_MSG("(~w) External service connected", [Socket]),
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Access = case lists:keysearch(access, 1, Opts) of
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{value, {_, A}} -> A;
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_ -> all
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end,
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{Hosts, Password} =
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case lists:keysearch(hosts, 1, Opts) of
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{value, {_, Hs, HOpts}} ->
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case lists:keysearch(password, 1, HOpts) of
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{value, {_, P}} ->
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{Hs, P};
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_ ->
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% TODO: generate error
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false
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end;
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_ ->
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case lists:keysearch(host, 1, Opts) of
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{value, {_, H, HOpts}} ->
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case lists:keysearch(password, 1, HOpts) of
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{value, {_, P}} ->
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{[H], P};
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_ ->
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% TODO: generate error
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false
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end;
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_ ->
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% TODO: generate error
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false
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end
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end,
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Shaper = case lists:keysearch(shaper_rule, 1, Opts) of
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{value, {_, S}} -> S;
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_ -> none
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end,
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CheckFrom = case lists:keysearch(service_check_from, 1, Opts) of
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{value, {_, CF}} -> CF;
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_ -> true
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end,
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SockMod:change_shaper(Socket, Shaper),
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{ok, wait_for_stream, #state{socket = Socket,
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sockmod = SockMod,
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streamid = new_id(),
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hosts = Hosts,
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password = Password,
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access = Access,
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check_from = CheckFrom
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}}.
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%%----------------------------------------------------------------------
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%% Func: StateName/2
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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wait_for_stream({xmlstreamstart, _Name, Attrs}, StateData) ->
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case xml:get_attr_s("xmlns", Attrs) of
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"jabber:component:accept" ->
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%% Note: XEP-0114 requires to check that destination is a Jabber
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%% component served by this Jabber server.
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%% However several transports don't respect that,
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%% so ejabberd doesn't check 'to' attribute (EJAB-717)
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To = xml:get_attr_s("to", Attrs),
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Header = io_lib:format(?STREAM_HEADER,
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[StateData#state.streamid, xml:crypt(To)]),
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send_text(StateData, Header),
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{next_state, wait_for_handshake, StateData};
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_ ->
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send_text(StateData, ?INVALID_HEADER_ERR),
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{stop, normal, StateData}
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end;
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wait_for_stream({xmlstreamerror, _}, StateData) ->
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Header = io_lib:format(?STREAM_HEADER,
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["none", ?MYNAME]),
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send_text(StateData,
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Header ++ ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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wait_for_stream(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_handshake({xmlstreamelement, El}, StateData) ->
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{xmlelement, Name, _Attrs, Els} = El,
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case {Name, xml:get_cdata(Els)} of
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{"handshake", Digest} ->
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case sha:sha(StateData#state.streamid ++
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StateData#state.password) of
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Digest ->
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send_text(StateData, "<handshake/>"),
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lists:foreach(
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fun(H) ->
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ejabberd_router:register_route(H),
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?INFO_MSG("Route registered for service ~p~n", [H])
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end, StateData#state.hosts),
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{next_state, stream_established, StateData};
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_ ->
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send_text(StateData, ?INVALID_HANDSHAKE_ERR),
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{stop, normal, StateData}
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end;
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_ ->
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{next_state, wait_for_handshake, StateData}
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end;
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wait_for_handshake({xmlstreamend, _Name}, StateData) ->
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{stop, normal, StateData};
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wait_for_handshake({xmlstreamerror, _}, StateData) ->
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send_text(StateData, ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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wait_for_handshake(closed, StateData) ->
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{stop, normal, StateData}.
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stream_established({xmlstreamelement, El}, StateData) ->
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NewEl = jlib:remove_attr("xmlns", El),
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{xmlelement, Name, Attrs, _Els} = NewEl,
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From = xml:get_attr_s("from", Attrs),
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FromJID = case StateData#state.check_from of
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%% If the admin does not want to check the from field
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%% when accept packets from any address.
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%% In this case, the component can send packet of
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%% behalf of the server users.
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false -> jlib:string_to_jid(From);
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%% The default is the standard behaviour in XEP-0114
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_ ->
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FromJID1 = jlib:string_to_jid(From),
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case FromJID1 of
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#jid{lserver = Server} ->
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case lists:member(Server, StateData#state.hosts) of
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true -> FromJID1;
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false -> error
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end;
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_ -> error
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end
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end,
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To = xml:get_attr_s("to", Attrs),
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ToJID = case To of
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"" -> error;
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_ -> jlib:string_to_jid(To)
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end,
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if ((Name == "iq") or
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(Name == "message") or
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(Name == "presence")) and
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(ToJID /= error) and (FromJID /= error) ->
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ejabberd_router:route(FromJID, ToJID, NewEl);
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true ->
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Err = jlib:make_error_reply(NewEl, ?ERR_BAD_REQUEST),
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send_element(StateData, Err),
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error
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end,
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{next_state, stream_established, StateData};
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stream_established({xmlstreamend, _Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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stream_established({xmlstreamerror, _}, StateData) ->
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send_text(StateData, ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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stream_established(closed, StateData) ->
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% TODO
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{stop, normal, StateData}.
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%%----------------------------------------------------------------------
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%% Func: StateName/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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%state_name(Event, From, StateData) ->
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% Reply = ok,
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% {reply, Reply, state_name, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_event/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_event(_Event, StateName, StateData) ->
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_sync_event/4
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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handle_sync_event(_Event, _From, StateName, StateData) ->
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Reply = ok,
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{reply, Reply, StateName, StateData}.
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code_change(_OldVsn, StateName, StateData, _Extra) ->
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{ok, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_info/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_info({send_text, Text}, StateName, StateData) ->
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send_text(StateData, Text),
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{next_state, StateName, StateData};
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handle_info({send_element, El}, StateName, StateData) ->
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send_element(StateData, El),
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{next_state, StateName, StateData};
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handle_info({route, From, To, Packet}, StateName, StateData) ->
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case acl:match_rule(global, StateData#state.access, From) of
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allow ->
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{xmlelement, Name, Attrs, Els} = Packet,
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Attrs2 = jlib:replace_from_to_attrs(jlib:jid_to_string(From),
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jlib:jid_to_string(To),
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Attrs),
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Text = xml:element_to_string({xmlelement, Name, Attrs2, Els}),
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send_text(StateData, Text);
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deny ->
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Err = jlib:make_error_reply(Packet, ?ERR_NOT_ALLOWED),
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ejabberd_router:route(To, From, Err)
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end,
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: terminate/3
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%% Purpose: Shutdown the fsm
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%% Returns: any
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%%----------------------------------------------------------------------
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terminate(Reason, StateName, StateData) ->
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?INFO_MSG("terminated: ~p", [Reason]),
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case StateName of
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stream_established ->
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lists:foreach(
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fun(H) ->
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ejabberd_router:unregister_route(H)
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end, StateData#state.hosts);
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_ ->
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ok
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end,
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(StateData#state.sockmod):close(StateData#state.socket),
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ok.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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send_text(StateData, Text) ->
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(StateData#state.sockmod):send(StateData#state.socket, Text).
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send_element(StateData, El) ->
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send_text(StateData, xml:element_to_string(El)).
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new_id() ->
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randoms:get_string().
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