%%%---------------------------------------------------------------------- %%% File : ejabberd_s2s.erl %%% Author : Alexey Shchepin %%% Purpose : S2S connections manager %%% Created : 7 Dec 2002 by Alexey Shchepin %%% %%% %%% 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_s2s). -protocol({xep, 220, '1.1'}). -author('alexey@process-one.net'). -behaviour(gen_server). %% API -export([start_link/0, stop/0, route/1, have_connection/1, get_connections_pids/1, try_register/1, remove_connection/2, start_connection/2, start_connection/3, dirty_get_connections/0, allow_host/2, incoming_s2s_number/0, outgoing_s2s_number/0, stop_s2s_connections/0, clean_temporarily_blocked_table/0, list_temporarily_blocked_hosts/0, external_host_overloaded/1, is_temporarly_blocked/1, get_commands_spec/0, zlib_enabled/1, get_idle_timeout/1, tls_required/1, tls_enabled/1, tls_options/3, host_up/1, host_down/1, queue_type/1]). %% gen_server callbacks -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]). -export([get_info_s2s_connections/1]). -include("logger.hrl"). -include("xmpp.hrl"). -include("ejabberd_commands.hrl"). -include_lib("stdlib/include/ms_transform.hrl"). -include("ejabberd_stacktrace.hrl"). -include("translate.hrl"). -define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER, 1). -define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE, 1). -define(S2S_OVERLOAD_BLOCK_PERIOD, 60). %% once a server is temporary blocked, it stay blocked for 60 seconds -record(s2s, {fromto :: {binary(), binary()}, pid :: pid()}). -record(state, {}). -record(temporarily_blocked, {host :: binary(), timestamp :: integer()}). -type temporarily_blocked() :: #temporarily_blocked{}. start_link() -> gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). -spec stop() -> ok. stop() -> _ = supervisor:terminate_child(ejabberd_sup, ?MODULE), _ = supervisor:delete_child(ejabberd_sup, ?MODULE), ok. clean_temporarily_blocked_table() -> mnesia:clear_table(temporarily_blocked). -spec list_temporarily_blocked_hosts() -> [temporarily_blocked()]. list_temporarily_blocked_hosts() -> ets:tab2list(temporarily_blocked). -spec external_host_overloaded(binary()) -> {aborted, any()} | {atomic, ok}. external_host_overloaded(Host) -> ?INFO_MSG("Disabling s2s connections to ~ts for ~p seconds", [Host, ?S2S_OVERLOAD_BLOCK_PERIOD]), mnesia:transaction(fun () -> Time = erlang:monotonic_time(), mnesia:write(#temporarily_blocked{host = Host, timestamp = Time}) end). -spec is_temporarly_blocked(binary()) -> boolean(). is_temporarly_blocked(Host) -> case mnesia:dirty_read(temporarily_blocked, Host) of [] -> false; [#temporarily_blocked{timestamp = T} = Entry] -> Diff = erlang:monotonic_time() - T, case erlang:convert_time_unit(Diff, native, microsecond) of N when N > (?S2S_OVERLOAD_BLOCK_PERIOD) * 1000 * 1000 -> mnesia:dirty_delete_object(Entry), false; _ -> true end end. -spec remove_connection({binary(), binary()}, pid()) -> ok. remove_connection({From, To} = FromTo, Pid) -> case mnesia:dirty_match_object(s2s, #s2s{fromto = FromTo, pid = Pid}) of [#s2s{pid = Pid}] -> F = fun() -> mnesia:delete_object(#s2s{fromto = FromTo, pid = Pid}) end, case mnesia:transaction(F) of {atomic, _} -> ok; {aborted, Reason} -> ?ERROR_MSG("Failed to unregister s2s connection ~ts -> ~ts: " "Mnesia failure: ~p", [From, To, Reason]) end; _ -> ok end. -spec have_connection({binary(), binary()}) -> boolean(). have_connection(FromTo) -> case catch mnesia:dirty_read(s2s, FromTo) of [_] -> true; _ -> false end. -spec get_connections_pids({binary(), binary()}) -> [pid()]. get_connections_pids(FromTo) -> case catch mnesia:dirty_read(s2s, FromTo) of L when is_list(L) -> [Connection#s2s.pid || Connection <- L]; _ -> [] end. -spec try_register({binary(), binary()}) -> boolean(). try_register({From, To} = FromTo) -> MaxS2SConnectionsNumber = max_s2s_connections_number(FromTo), MaxS2SConnectionsNumberPerNode = max_s2s_connections_number_per_node(FromTo), F = fun () -> L = mnesia:read({s2s, FromTo}), NeededConnections = needed_connections_number(L, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode), if NeededConnections > 0 -> mnesia:write(#s2s{fromto = FromTo, pid = self()}), true; true -> false end end, case mnesia:transaction(F) of {atomic, Res} -> Res; {aborted, Reason} -> ?ERROR_MSG("Failed to register s2s connection ~ts -> ~ts: " "Mnesia failure: ~p", [From, To, Reason]), false end. -spec dirty_get_connections() -> [{binary(), binary()}]. dirty_get_connections() -> mnesia:dirty_all_keys(s2s). -spec tls_options(binary(), binary(), [proplists:property()]) -> [proplists:property()]. tls_options(LServer, ServerHost, DefaultOpts) -> TLSOpts1 = case ejabberd_pkix:get_certfile(LServer) of error -> DefaultOpts; {ok, CertFile} -> lists:keystore(certfile, 1, DefaultOpts, {certfile, CertFile}) end, TLSOpts2 = case ejabberd_option:s2s_ciphers(ServerHost) of undefined -> TLSOpts1; Ciphers -> lists:keystore(ciphers, 1, TLSOpts1, {ciphers, Ciphers}) end, TLSOpts3 = case ejabberd_option:s2s_protocol_options(ServerHost) of undefined -> TLSOpts2; ProtoOpts -> lists:keystore(protocol_options, 1, TLSOpts2, {protocol_options, ProtoOpts}) end, TLSOpts4 = case ejabberd_option:s2s_dhfile(ServerHost) of undefined -> TLSOpts3; DHFile -> lists:keystore(dhfile, 1, TLSOpts3, {dhfile, DHFile}) end, TLSOpts5 = case lists:keymember(cafile, 1, TLSOpts4) of true -> TLSOpts4; false -> [{cafile, get_cafile(ServerHost)}|TLSOpts4] end, case ejabberd_option:s2s_tls_compression(ServerHost) of undefined -> TLSOpts5; false -> [compression_none | TLSOpts5]; true -> lists:delete(compression_none, TLSOpts5) end. -spec tls_required(binary()) -> boolean(). tls_required(LServer) -> TLS = use_starttls(LServer), TLS == required. -spec tls_enabled(binary()) -> boolean(). tls_enabled(LServer) -> TLS = use_starttls(LServer), TLS /= false. -spec zlib_enabled(binary()) -> boolean(). zlib_enabled(LServer) -> ejabberd_option:s2s_zlib(LServer). -spec use_starttls(binary()) -> boolean() | optional | required. use_starttls(LServer) -> ejabberd_option:s2s_use_starttls(LServer). -spec get_idle_timeout(binary()) -> non_neg_integer() | infinity. get_idle_timeout(LServer) -> ejabberd_option:s2s_timeout(LServer). -spec queue_type(binary()) -> ram | file. queue_type(LServer) -> ejabberd_option:s2s_queue_type(LServer). -spec get_cafile(binary()) -> file:filename_all() | undefined. get_cafile(LServer) -> case ejabberd_option:s2s_cafile(LServer) of undefined -> ejabberd_option:ca_file(); File -> File end. %%==================================================================== %% gen_server callbacks %%==================================================================== init([]) -> update_tables(), ejabberd_mnesia:create(?MODULE, s2s, [{ram_copies, [node()]}, {type, bag}, {attributes, record_info(fields, s2s)}]), case mnesia:subscribe(system) of {ok, _} -> ejabberd_commands:register_commands(get_commands_spec()), ejabberd_mnesia:create( ?MODULE, temporarily_blocked, [{ram_copies, [node()]}, {attributes, record_info(fields, temporarily_blocked)}]), ejabberd_hooks:add(host_up, ?MODULE, host_up, 50), ejabberd_hooks:add(host_down, ?MODULE, host_down, 60), lists:foreach(fun host_up/1, ejabberd_option:hosts()), {ok, #state{}}; {error, Reason} -> {stop, Reason} end. handle_call(Request, From, State) -> ?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]), {noreply, State}. handle_cast(Msg, State) -> ?WARNING_MSG("Unexpected cast: ~p", [Msg]), {noreply, State}. handle_info({mnesia_system_event, {mnesia_down, Node}}, State) -> clean_table_from_bad_node(Node), {noreply, State}; handle_info({route, Packet}, State) -> try route(Packet) catch ?EX_RULE(Class, Reason, St) -> StackTrace = ?EX_STACK(St), ?ERROR_MSG("Failed to route packet:~n~ts~n** ~ts", [xmpp:pp(Packet), misc:format_exception(2, Class, Reason, StackTrace)]) end, {noreply, State}; handle_info(Info, State) -> ?WARNING_MSG("Unexpected info: ~p", [Info]), {noreply, State}. terminate(_Reason, _State) -> ejabberd_commands:unregister_commands(get_commands_spec()), stop_s2s_connections(stream_error()), lists:foreach(fun host_down/1, ejabberd_option:hosts()), ejabberd_hooks:delete(host_up, ?MODULE, host_up, 50), ejabberd_hooks:delete(host_down, ?MODULE, host_down, 60). code_change(_OldVsn, State, _Extra) -> {ok, State}. %%-------------------------------------------------------------------- %%% Internal functions %%-------------------------------------------------------------------- -spec host_up(binary()) -> ok. host_up(Host) -> ejabberd_s2s_in:host_up(Host), ejabberd_s2s_out:host_up(Host). -spec host_down(binary()) -> ok. host_down(Host) -> Err = stream_error(), lists:foreach( fun(#s2s{fromto = {From, _}, pid = Pid}) when node(Pid) == node() -> case ejabberd_router:host_of_route(From) of Host -> ejabberd_s2s_out:send(Pid, Err), ejabberd_s2s_out:stop(Pid); _ -> ok end; (_) -> ok end, ets:tab2list(s2s)), ejabberd_s2s_in:host_down(Host), ejabberd_s2s_out:host_down(Host). -spec clean_table_from_bad_node(node()) -> any(). clean_table_from_bad_node(Node) -> F = fun() -> Es = mnesia:select( s2s, ets:fun2ms( fun(#s2s{pid = Pid} = E) when node(Pid) == Node -> E end)), lists:foreach(fun mnesia:delete_object/1, Es) end, mnesia:async_dirty(F). -spec route(stanza()) -> ok. route(Packet) -> ?DEBUG("Local route:~n~ts", [xmpp:pp(Packet)]), From = xmpp:get_from(Packet), To = xmpp:get_to(Packet), case start_connection(From, To) of {ok, Pid} when is_pid(Pid) -> ?DEBUG("Sending to process ~p~n", [Pid]), #jid{lserver = MyServer} = From, ejabberd_hooks:run(s2s_send_packet, MyServer, [Packet]), ejabberd_s2s_out:route(Pid, Packet); {error, Reason} -> Lang = xmpp:get_lang(Packet), Err = case Reason of forbidden -> xmpp:err_forbidden(?T("Access denied by service policy"), Lang); internal_server_error -> xmpp:err_internal_server_error() end, ejabberd_router:route_error(Packet, Err) end. -spec start_connection(jid(), jid()) -> {ok, pid()} | {error, forbidden | internal_server_error}. start_connection(From, To) -> start_connection(From, To, []). -spec start_connection(jid(), jid(), [proplists:property()]) -> {ok, pid()} | {error, forbidden | internal_server_error}. start_connection(From, To, Opts) -> #jid{lserver = MyServer} = From, #jid{lserver = Server} = To, FromTo = {MyServer, Server}, MaxS2SConnectionsNumber = max_s2s_connections_number(FromTo), MaxS2SConnectionsNumberPerNode = max_s2s_connections_number_per_node(FromTo), ?DEBUG("Finding connection for ~p~n", [FromTo]), case mnesia:dirty_read(s2s, FromTo) of [] -> %% We try to establish all the connections if the host is not a %% service and if the s2s host is not blacklisted or %% is in whitelist: LServer = ejabberd_router:host_of_route(MyServer), case allow_host(LServer, Server) of true -> NeededConnections = needed_connections_number( [], MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode), open_several_connections(NeededConnections, MyServer, Server, From, FromTo, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts); false -> {error, forbidden} end; L when is_list(L) -> NeededConnections = needed_connections_number(L, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode), if NeededConnections > 0 -> %% We establish the missing connections for this pair. open_several_connections(NeededConnections, MyServer, Server, From, FromTo, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts); true -> %% We choose a connexion from the pool of opened ones. {ok, choose_connection(From, L)} end end. -spec choose_connection(jid(), [#s2s{}]) -> pid(). choose_connection(From, Connections) -> choose_pid(From, [C#s2s.pid || C <- Connections]). -spec choose_pid(jid(), [pid()]) -> pid(). choose_pid(From, Pids) -> Pids1 = case [P || P <- Pids, node(P) == node()] of [] -> Pids; Ps -> Ps end, Pid = lists:nth(erlang:phash(jid:remove_resource(From), length(Pids1)), Pids1), ?DEBUG("Using ejabberd_s2s_out ~p~n", [Pid]), Pid. -spec open_several_connections(pos_integer(), binary(), binary(), jid(), {binary(), binary()}, integer(), integer(), [proplists:property()]) -> {ok, pid()} | {error, internal_server_error}. open_several_connections(N, MyServer, Server, From, FromTo, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts) -> case lists:flatmap( fun(_) -> new_connection(MyServer, Server, From, FromTo, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts) end, lists:seq(1, N)) of [] -> {error, internal_server_error}; PIDs -> {ok, choose_pid(From, PIDs)} end. -spec new_connection(binary(), binary(), jid(), {binary(), binary()}, integer(), integer(), [proplists:property()]) -> [pid()]. new_connection(MyServer, Server, From, FromTo, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts) -> {ok, Pid} = ejabberd_s2s_out:start(MyServer, Server, Opts), F = fun() -> L = mnesia:read({s2s, FromTo}), NeededConnections = needed_connections_number(L, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode), if NeededConnections > 0 -> mnesia:write(#s2s{fromto = FromTo, pid = Pid}), Pid; true -> choose_connection(From, L) end end, TRes = mnesia:transaction(F), case TRes of {atomic, Pid1} -> if Pid1 == Pid -> ejabberd_s2s_out:connect(Pid); true -> ejabberd_s2s_out:stop(Pid) end, [Pid1]; {aborted, Reason} -> ?ERROR_MSG("Failed to register s2s connection ~ts -> ~ts: " "Mnesia failure: ~p", [MyServer, Server, Reason]), ejabberd_s2s_out:stop(Pid), [] end. -spec max_s2s_connections_number({binary(), binary()}) -> pos_integer(). max_s2s_connections_number({From, To}) -> case ejabberd_shaper:match(From, max_s2s_connections, jid:make(To)) of Max when is_integer(Max) -> Max; _ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER end. -spec max_s2s_connections_number_per_node({binary(), binary()}) -> pos_integer(). max_s2s_connections_number_per_node({From, To}) -> case ejabberd_shaper:match(From, max_s2s_connections_per_node, jid:make(To)) of Max when is_integer(Max) -> Max; _ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE end. -spec needed_connections_number([#s2s{}], integer(), integer()) -> integer(). needed_connections_number(Ls, MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode) -> LocalLs = [L || L <- Ls, node(L#s2s.pid) == node()], lists:min([MaxS2SConnectionsNumber - length(Ls), MaxS2SConnectionsNumberPerNode - length(LocalLs)]). %%%---------------------------------------------------------------------- %%% ejabberd commands get_commands_spec() -> [#ejabberd_commands{ name = incoming_s2s_number, tags = [stats, s2s], desc = "Number of incoming s2s connections on the node", policy = admin, module = ?MODULE, function = incoming_s2s_number, args = [], result = {s2s_incoming, integer}}, #ejabberd_commands{ name = outgoing_s2s_number, tags = [stats, s2s], desc = "Number of outgoing s2s connections on the node", policy = admin, module = ?MODULE, function = outgoing_s2s_number, args = [], result = {s2s_outgoing, integer}}, #ejabberd_commands{ name = stop_s2s_connections, tags = [s2s], desc = "Stop all s2s outgoing and incoming connections", policy = admin, module = ?MODULE, function = stop_s2s_connections, args = [], result = {res, rescode}}]. %% TODO Move those stats commands to ejabberd stats command ? incoming_s2s_number() -> supervisor_count(ejabberd_s2s_in_sup). outgoing_s2s_number() -> supervisor_count(ejabberd_s2s_out_sup). -spec supervisor_count(atom()) -> non_neg_integer(). supervisor_count(Supervisor) -> try supervisor:count_children(Supervisor) of Props -> proplists:get_value(workers, Props, 0) catch _:_ -> 0 end. -spec stop_s2s_connections() -> ok. stop_s2s_connections() -> stop_s2s_connections(xmpp:serr_reset()). -spec stop_s2s_connections(stream_error()) -> ok. stop_s2s_connections(Err) -> lists:foreach( fun({_Id, Pid, _Type, _Module}) -> ejabberd_s2s_in:send(Pid, Err), ejabberd_s2s_in:stop(Pid), supervisor:terminate_child(ejabberd_s2s_in_sup, Pid) end, supervisor:which_children(ejabberd_s2s_in_sup)), lists:foreach( fun({_Id, Pid, _Type, _Module}) -> ejabberd_s2s_out:send(Pid, Err), ejabberd_s2s_out:stop(Pid), supervisor:terminate_child(ejabberd_s2s_out_sup, Pid) end, supervisor:which_children(ejabberd_s2s_out_sup)), _ = mnesia:clear_table(s2s), ok. -spec stream_error() -> stream_error(). stream_error() -> case ejabberd_cluster:get_nodes() of [Node] when Node == node() -> xmpp:serr_system_shutdown(); _ -> xmpp:serr_reset() end. %%%---------------------------------------------------------------------- %%% Update Mnesia tables update_tables() -> _ = mnesia:delete_table(local_s2s), ok. %% Check if host is in blacklist or white list -spec allow_host(binary(), binary()) -> boolean(). allow_host(MyServer, S2SHost) -> allow_host1(MyServer, S2SHost) andalso not is_temporarly_blocked(S2SHost). -spec allow_host1(binary(), binary()) -> boolean(). allow_host1(MyHost, S2SHost) -> Rule = ejabberd_option:s2s_access(MyHost), JID = jid:make(S2SHost), case acl:match_rule(MyHost, Rule, JID) of deny -> false; allow -> case ejabberd_hooks:run_fold(s2s_allow_host, MyHost, allow, [MyHost, S2SHost]) of deny -> false; allow -> true end end. %% Get information about S2S connections of the specified type. %% @spec (Type) -> [Info] %% where Type = in | out %% Info = [{InfoName::atom(), InfoValue::any()}] get_info_s2s_connections(Type) -> ChildType = case Type of in -> ejabberd_s2s_in_sup; out -> ejabberd_s2s_out_sup end, Connections = supervisor:which_children(ChildType), get_s2s_info(Connections, Type). get_s2s_info(Connections, Type) -> complete_s2s_info(Connections, Type, []). complete_s2s_info([], _, Result) -> Result; complete_s2s_info([Connection | T], Type, Result) -> {_, PID, _, _} = Connection, State = get_s2s_state(PID), complete_s2s_info(T, Type, [State | Result]). -spec get_s2s_state(pid()) -> [{status, open | closed | error} | {s2s_pid, pid()}]. get_s2s_state(S2sPid) -> Infos = case p1_fsm:sync_send_all_state_event(S2sPid, get_state_infos) of {state_infos, Is} -> [{status, open} | Is]; {noproc, _} -> [{status, closed}]; %% Connection closed {badrpc, _} -> [{status, error}] end, [{s2s_pid, S2sPid} | Infos].