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|
%%%-------------------------------------------------------------------
%%% Created : 11 Dec 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% 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(xmpp_stream_in).
-behaviour(ejabberd_config).
-behaviour(ejabberd_socket).
-protocol({xep, 114, '1.6'}).
%% ejabberd_socket callbacks
-export([start/2, start_link/2, socket_type/0]).
%% ejabberd_config callbacks
-export([opt_type/1, transform_listen_option/2]).
%% 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]).
%% API
-export([send/2]).
-include("ejabberd.hrl").
-include("xmpp.hrl").
-include("logger.hrl").
-type state() :: map().
-export_type([state/0]).
%%%===================================================================
%%% API
%%%===================================================================
start(SockData, Opts) ->
xmpp_stream_in:start(?MODULE, [SockData, Opts],
ejabberd_config:fsm_limit_opts(Opts)).
start_link(SockData, Opts) ->
xmpp_stream_in:start_link(?MODULE, [SockData, Opts],
ejabberd_config:fsm_limit_opts(Opts)).
socket_type() ->
xml_stream.
-spec send(pid(), xmpp_element()) -> ok;
(state(), xmpp_element()) -> state().
send(Stream, Pkt) ->
xmpp_stream_in:send(Stream, Pkt).
%%%===================================================================
%%% xmpp_stream_in callbacks
%%%===================================================================
init([State, Opts]) ->
Access = gen_mod:get_opt(access, Opts, fun acl:access_rules_validator/1, all),
Shaper = gen_mod:get_opt(shaper_rule, Opts, fun acl:shaper_rules_validator/1, none),
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(randoms:bytes(20))),
dict:store(H, P, D)
end, dict:new(), HOpts);
false ->
Pass = proplists:get_value(
password, Opts,
p1_sha:sha(randoms:bytes(20))),
dict:from_list([{global, Pass}])
end,
CheckFrom = gen_mod:get_opt(check_from, Opts,
fun(Flag) when is_boolean(Flag) -> Flag end),
xmpp_stream_in:change_shaper(State, Shaper),
State1 = State#{access => Access,
xmlns => ?NS_COMPONENT,
lang => ?MYLANG,
server => ?MYNAME,
host_opts => HostOpts,
check_from => CheckFrom},
ejabberd_hooks:run_fold(component_init, {ok, State1}, [Opts]).
handle_stream_start(_StreamStart,
#{remote_server := RemoteServer,
lang := Lang,
host_opts := HostOpts} = State) ->
case ejabberd_router:is_my_host(RemoteServer) of
true ->
Txt = <<"Unable to register route on existing local domain">>,
xmpp_stream_in:send(State, xmpp:serr_conflict(Txt, Lang));
false ->
NewHostOpts = case dict:is_key(RemoteServer, HostOpts) of
true ->
HostOpts;
false ->
case dict:find(global, HostOpts) of
{ok, GlobalPass} ->
dict:from_list([{RemoteServer, GlobalPass}]);
error ->
HostOpts
end
end,
State#{host_opts => NewHostOpts}
end.
get_password_fun(#{remote_server := RemoteServer,
socket := Socket,
ip := IP,
host_opts := HostOpts}) ->
fun(_) ->
case dict:find(RemoteServer, HostOpts) of
{ok, Password} ->
{Password, undefined};
error ->
?ERROR_MSG("(~s) Domain ~s is unconfigured for "
"external component from ~s",
[ejabberd_socket:pp(Socket), RemoteServer,
ejabberd_config:may_hide_data(jlib:ip_to_list(IP))]),
{false, undefined}
end
end.
handle_auth_success(_, Mech, _,
#{remote_server := RemoteServer, host_opts := HostOpts,
socket := Socket, ip := IP} = State) ->
?INFO_MSG("(~s) Accepted external component ~s authentication "
"for ~s from ~s",
[ejabberd_socket:pp(Socket), Mech, RemoteServer,
ejabberd_config:may_hide_data(jlib:ip_to_list(IP))]),
lists:foreach(
fun (H) ->
ejabberd_router:register_route(H, ?MYNAME),
ejabberd_hooks:run(component_connected, [H])
end, dict:fetch_keys(HostOpts)),
State.
handle_auth_failure(_, Mech, Reason,
#{remote_server := RemoteServer,
socket := Socket, ip := IP} = State) ->
?ERROR_MSG("(~s) Failed external component ~s authentication "
"for ~s from ~s: ~s",
[ejabberd_socket:pp(Socket), Mech, RemoteServer,
ejabberd_config:may_hide_data(jlib:ip_to_list(IP)),
Reason]),
State.
handle_authenticated_packet(Pkt, #{lang := Lang} = State) ->
From = xmpp:get_from(Pkt),
case check_from(From, State) of
true ->
To = xmpp:get_to(Pkt),
ejabberd_router:route(From, To, Pkt),
State;
false ->
Txt = <<"Improper domain part of 'from' attribute">>,
Err = xmpp:serr_invalid_from(Txt, Lang),
xmpp_stream_in:send(State, Err)
end.
handle_info({route, From, To, Packet}, #{access := Access} = State) ->
case acl:match_rule(global, Access, From) of
allow ->
Pkt = xmpp:set_from_to(Packet, From, To),
xmpp_stream_in:send(State, Pkt);
deny ->
Lang = xmpp:get_lang(Packet),
Err = xmpp:err_not_allowed(<<"Denied by ACL">>, Lang),
ejabberd_router:route_error(To, From, Packet, Err),
State
end;
handle_info(Info, State) ->
?ERROR_MSG("Unexpected info: ~p", [Info]),
State.
terminate(Reason, #{stream_state := StreamState, host_opts := HostOpts}) ->
case StreamState of
established ->
lists:foreach(
fun(H) ->
ejabberd_router:unregister_route(H),
ejabberd_hooks:run(component_disconnected, [H, Reason])
end, dict:fetch_keys(HostOpts));
_ ->
ok
end.
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,
dict:is_key(Server, HostOpts).
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].
opt_type(_) -> [].
|
