mirror of
https://github.com/processone/ejabberd.git
synced 2024-10-31 15:21:38 +01:00
1163 lines
39 KiB
Erlang
1163 lines
39 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% Created : 26 Nov 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%-------------------------------------------------------------------
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-module(xmpp_stream_in).
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-define(GEN_SERVER, p1_server).
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-behaviour(?GEN_SERVER).
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-protocol({rfc, 6120}).
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-protocol({xep, 114, '1.6'}).
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%% API
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-export([start/3, start_link/3, call/3, cast/2, reply/2, stop/1,
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send/2, close/1, close/2, send_error/3, establish/1,
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get_transport/1, change_shaper/2, set_timeout/2, format_error/1]).
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%% gen_server callbacks
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-export([init/1, handle_cast/2, handle_call/3, handle_info/2,
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terminate/2, code_change/3]).
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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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-include("xmpp.hrl").
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-type state() :: map().
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-type stop_reason() :: {stream, reset | {in | out, stream_error()}} |
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{tls, inet:posix() | atom() | binary()} |
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{socket, inet:posix() | atom()} |
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internal_failure.
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-export_type([state/0, stop_reason/0]).
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-callback init(list()) -> {ok, state()} | {error, term()} | ignore.
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-callback handle_cast(term(), state()) -> state().
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-callback handle_call(term(), term(), state()) -> state().
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-callback handle_info(term(), state()) -> state().
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-callback terminate(term(), state()) -> any().
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-callback code_change(term(), state(), term()) -> {ok, state()} | {error, term()}.
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-callback handle_stream_start(stream_start(), state()) -> state().
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-callback handle_stream_established(state()) -> state().
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-callback handle_stream_end(stop_reason(), state()) -> state().
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-callback handle_cdata(binary(), state()) -> state().
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-callback handle_unauthenticated_packet(xmpp_element(), state()) -> state().
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-callback handle_authenticated_packet(xmpp_element(), state()) -> state().
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-callback handle_unbinded_packet(xmpp_element(), state()) -> state().
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-callback handle_auth_success(binary(), binary(), module(), state()) -> state().
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-callback handle_auth_failure(binary(), binary(), binary(), state()) -> state().
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-callback handle_send(xmpp_element(), ok | {error, inet:posix()}, state()) -> state().
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-callback handle_recv(fxml:xmlel(), xmpp_element() | {error, term()}, state()) -> state().
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-callback handle_timeout(state()) -> state().
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-callback get_password_fun(state()) -> fun().
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-callback check_password_fun(state()) -> fun().
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-callback check_password_digest_fun(state()) -> fun().
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-callback bind(binary(), state()) -> {ok, state()} | {error, stanza_error(), state()}.
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-callback compress_methods(state()) -> [binary()].
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-callback tls_options(state()) -> [proplists:property()].
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-callback tls_required(state()) -> boolean().
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-callback tls_verify(state()) -> boolean().
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-callback tls_enabled(state()) -> boolean().
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-callback sasl_mechanisms([cyrsasl:mechanism()], state()) -> [cyrsasl:mechanism()].
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-callback unauthenticated_stream_features(state()) -> [xmpp_element()].
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-callback authenticated_stream_features(state()) -> [xmpp_element()].
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%% All callbacks are optional
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-optional_callbacks([init/1,
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handle_cast/2,
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handle_call/3,
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handle_info/2,
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terminate/2,
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code_change/3,
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handle_stream_start/2,
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handle_stream_established/1,
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handle_stream_end/2,
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handle_cdata/2,
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handle_authenticated_packet/2,
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handle_unauthenticated_packet/2,
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handle_unbinded_packet/2,
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handle_auth_success/4,
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handle_auth_failure/4,
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handle_send/3,
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handle_recv/3,
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handle_timeout/1,
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get_password_fun/1,
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check_password_fun/1,
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check_password_digest_fun/1,
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bind/2,
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compress_methods/1,
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tls_options/1,
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tls_required/1,
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tls_verify/1,
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tls_enabled/1,
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sasl_mechanisms/2,
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unauthenticated_stream_features/1,
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authenticated_stream_features/1]).
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%%%===================================================================
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%%% API
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%%%===================================================================
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start(Mod, Args, Opts) ->
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?GEN_SERVER:start(?MODULE, [Mod|Args], Opts ++ ?FSMOPTS).
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start_link(Mod, Args, Opts) ->
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?GEN_SERVER:start_link(?MODULE, [Mod|Args], Opts ++ ?FSMOPTS).
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call(Ref, Msg, Timeout) ->
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?GEN_SERVER:call(Ref, Msg, Timeout).
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cast(Ref, Msg) ->
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?GEN_SERVER:cast(Ref, Msg).
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reply(Ref, Reply) ->
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?GEN_SERVER:reply(Ref, Reply).
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-spec stop(pid()) -> ok;
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(state()) -> no_return().
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stop(Pid) when is_pid(Pid) ->
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cast(Pid, stop);
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stop(#{owner := Owner} = State) when Owner == self() ->
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terminate(normal, State),
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exit(normal);
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stop(_) ->
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erlang:error(badarg).
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-spec send(pid(), xmpp_element()) -> ok;
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(state(), xmpp_element()) -> state().
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send(Pid, Pkt) when is_pid(Pid) ->
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cast(Pid, {send, Pkt});
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send(#{owner := Owner} = State, Pkt) when Owner == self() ->
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send_pkt(State, Pkt);
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send(_, _) ->
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erlang:error(badarg).
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-spec close(pid()) -> ok;
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(state()) -> state().
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close(Pid) when is_pid(Pid) ->
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close(Pid, closed);
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close(#{owner := Owner} = State) when Owner == self() ->
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close_socket(State);
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close(_) ->
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erlang:error(badarg).
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-spec close(pid(), atom()) -> ok.
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close(Pid, Reason) ->
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cast(Pid, {close, Reason}).
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-spec establish(state()) -> state().
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establish(State) ->
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process_stream_established(State).
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-spec set_timeout(state(), non_neg_integer() | infinity) -> state().
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set_timeout(#{owner := Owner} = State, Timeout) when Owner == self() ->
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case Timeout of
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infinity -> State#{stream_timeout => infinity};
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_ ->
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Time = p1_time_compat:monotonic_time(milli_seconds),
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State#{stream_timeout => {Timeout, Time}}
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end;
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set_timeout(_, _) ->
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erlang:error(badarg).
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get_transport(#{sockmod := SockMod, socket := Socket, owner := Owner})
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when Owner == self() ->
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SockMod:get_transport(Socket);
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get_transport(_) ->
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erlang:error(badarg).
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-spec change_shaper(state(), shaper:shaper()) -> ok.
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change_shaper(#{sockmod := SockMod, socket := Socket, owner := Owner}, Shaper)
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when Owner == self() ->
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SockMod:change_shaper(Socket, Shaper);
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change_shaper(_, _) ->
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erlang:error(badarg).
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-spec format_error(stop_reason()) -> binary().
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format_error({socket, Reason}) ->
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format("Connection failed: ~s", [format_inet_error(Reason)]);
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format_error({stream, reset}) ->
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<<"Stream reset by peer">>;
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format_error({stream, {in, #stream_error{reason = Reason, text = Txt}}}) ->
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format("Stream closed by peer: ~s", [format_stream_error(Reason, Txt)]);
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format_error({stream, {out, #stream_error{reason = Reason, text = Txt}}}) ->
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format("Stream closed by us: ~s", [format_stream_error(Reason, Txt)]);
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format_error({tls, Reason}) ->
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format("TLS failed: ~s", [format_tls_error(Reason)]);
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format_error(internal_failure) ->
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<<"Internal server error">>;
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format_error(Err) ->
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format("Unrecognized error: ~w", [Err]).
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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init([Module, {SockMod, Socket}, Opts]) ->
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Encrypted = proplists:get_bool(tls, Opts),
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SocketMonitor = SockMod:monitor(Socket),
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case SockMod:peername(Socket) of
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{ok, IP} ->
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Time = p1_time_compat:monotonic_time(milli_seconds),
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State = #{owner => self(),
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mod => Module,
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socket => Socket,
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sockmod => SockMod,
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socket_monitor => SocketMonitor,
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stream_timeout => {timer:seconds(30), Time},
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stream_direction => in,
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stream_id => new_id(),
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stream_state => wait_for_stream,
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stream_header_sent => false,
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stream_restarted => false,
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stream_compressed => false,
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stream_encrypted => Encrypted,
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stream_version => {1,0},
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stream_authenticated => false,
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xmlns => ?NS_CLIENT,
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lang => <<"">>,
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user => <<"">>,
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server => <<"">>,
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resource => <<"">>,
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lserver => <<"">>,
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ip => IP},
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case try Module:init([State, Opts])
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catch _:undef -> {ok, State}
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end of
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{ok, State1} when not Encrypted ->
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{_, State2, Timeout} = noreply(State1),
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{ok, State2, Timeout};
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{ok, State1} when Encrypted ->
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TLSOpts = try Module:tls_options(State1)
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catch _:undef -> []
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end,
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case SockMod:starttls(Socket, TLSOpts) of
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{ok, TLSSocket} ->
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State2 = State1#{socket => TLSSocket},
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{_, State3, Timeout} = noreply(State2),
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{ok, State3, Timeout};
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{error, Reason} ->
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{stop, Reason}
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end;
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{error, Reason} ->
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{stop, Reason};
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ignore ->
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ignore
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end;
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{error, _Reason} ->
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ignore
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end.
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handle_cast({send, Pkt}, State) ->
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noreply(send_pkt(State, Pkt));
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handle_cast(stop, State) ->
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{stop, normal, State};
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handle_cast({close, Reason}, State) ->
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State1 = close_socket(State),
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noreply(
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case is_disconnected(State) of
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true -> State1;
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false -> process_stream_end({socket, Reason}, State)
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end);
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handle_cast(Cast, #{mod := Mod} = State) ->
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noreply(try Mod:handle_cast(Cast, State)
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catch _:undef -> State
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end).
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handle_call(Call, From, #{mod := Mod} = State) ->
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noreply(try Mod:handle_call(Call, From, State)
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catch _:undef -> State
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end).
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handle_info({'$gen_event', {xmlstreamstart, Name, Attrs}},
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#{stream_state := wait_for_stream,
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xmlns := XMLNS, lang := MyLang} = State) ->
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El = #xmlel{name = Name, attrs = Attrs},
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noreply(
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try xmpp:decode(El, XMLNS, []) of
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#stream_start{} = Pkt ->
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State1 = send_header(State, Pkt),
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case is_disconnected(State1) of
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true -> State1;
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false -> process_stream(Pkt, State1)
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end;
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_ ->
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State1 = send_header(State),
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case is_disconnected(State1) of
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true -> State1;
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false -> send_pkt(State1, xmpp:serr_invalid_xml())
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end
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catch _:{xmpp_codec, Why} ->
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State1 = send_header(State),
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case is_disconnected(State1) of
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true -> State1;
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false ->
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Txt = xmpp:io_format_error(Why),
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Lang = select_lang(MyLang, xmpp:get_lang(El)),
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Err = xmpp:serr_invalid_xml(Txt, Lang),
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send_pkt(State1, Err)
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end
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end);
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handle_info({'$gen_event', {xmlstreamerror, Reason}}, #{lang := Lang}= State) ->
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State1 = send_header(State),
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noreply(
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case is_disconnected(State1) of
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true -> State1;
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false ->
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Err = case Reason of
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<<"XML stanza is too big">> ->
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xmpp:serr_policy_violation(Reason, Lang);
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{_, Txt} ->
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xmpp:serr_not_well_formed(Txt, Lang)
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end,
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send_pkt(State1, Err)
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end);
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handle_info({'$gen_event', {xmlstreamelement, El}},
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#{xmlns := NS, mod := Mod} = State) ->
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noreply(
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try xmpp:decode(El, NS, [ignore_els]) of
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Pkt ->
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State1 = try Mod:handle_recv(El, Pkt, State)
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catch _:undef -> State
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end,
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case is_disconnected(State1) of
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true -> State1;
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false -> process_element(Pkt, State1)
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end
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catch _:{xmpp_codec, Why} ->
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State1 = try Mod:handle_recv(El, {error, Why}, State)
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catch _:undef -> State
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end,
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case is_disconnected(State1) of
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true -> State1;
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false -> process_invalid_xml(State1, El, Why)
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end
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end);
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handle_info({'$gen_all_state_event', {xmlstreamcdata, Data}},
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#{mod := Mod} = State) ->
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noreply(try Mod:handle_cdata(Data, State)
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catch _:undef -> State
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end);
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handle_info({'$gen_event', {xmlstreamend, _}}, State) ->
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noreply(process_stream_end({stream, reset}, State));
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handle_info({'$gen_event', closed}, State) ->
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noreply(process_stream_end({socket, closed}, State));
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handle_info(timeout, #{mod := Mod} = State) ->
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Disconnected = is_disconnected(State),
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noreply(try Mod:handle_timeout(State)
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catch _:undef when not Disconnected ->
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send_pkt(State, xmpp:serr_connection_timeout());
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_:undef ->
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stop(State)
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end);
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handle_info({'DOWN', MRef, _Type, _Object, _Info},
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#{socket_monitor := MRef} = State) ->
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noreply(process_stream_end({socket, closed}, State));
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handle_info(Info, #{mod := Mod} = State) ->
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noreply(try Mod:handle_info(Info, State)
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catch _:undef -> State
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end).
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terminate(Reason, #{mod := Mod} = State) ->
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case get(already_terminated) of
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true ->
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State;
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_ ->
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put(already_terminated, true),
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try Mod:terminate(Reason, State)
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catch _:undef -> ok
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end,
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send_trailer(State)
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end.
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code_change(OldVsn, #{mod := Mod} = State, Extra) ->
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Mod:code_change(OldVsn, State, Extra).
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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-spec noreply(state()) -> {noreply, state(), non_neg_integer() | infinity}.
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noreply(#{stream_timeout := infinity} = State) ->
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{noreply, State, infinity};
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noreply(#{stream_timeout := {MSecs, StartTime}} = State) ->
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CurrentTime = p1_time_compat:monotonic_time(milli_seconds),
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Timeout = max(0, MSecs - CurrentTime + StartTime),
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{noreply, State, Timeout}.
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-spec new_id() -> binary().
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new_id() ->
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randoms:get_string().
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|
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-spec is_disconnected(state()) -> boolean().
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is_disconnected(#{stream_state := StreamState}) ->
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StreamState == disconnected.
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|
|
-spec process_invalid_xml(state(), fxml:xmlel(), term()) -> state().
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process_invalid_xml(#{lang := MyLang} = State, El, Reason) ->
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case xmpp:is_stanza(El) of
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true ->
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Txt = xmpp:io_format_error(Reason),
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Lang = select_lang(MyLang, xmpp:get_lang(El)),
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send_error(State, El, xmpp:err_bad_request(Txt, Lang));
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false ->
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case {xmpp:get_name(El), xmpp:get_ns(El)} of
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{Tag, ?NS_SASL} when Tag == <<"auth">>;
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Tag == <<"response">>;
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Tag == <<"abort">> ->
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Txt = xmpp:io_format_error(Reason),
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Err = #sasl_failure{reason = 'malformed-request',
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text = xmpp:mk_text(Txt, MyLang)},
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send_pkt(State, Err);
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{<<"starttls">>, ?NS_TLS} ->
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send_pkt(State, #starttls_failure{});
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{<<"compress">>, ?NS_COMPRESS} ->
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Err = #compress_failure{reason = 'setup-failed'},
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send_pkt(State, Err);
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_ ->
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%% Maybe add something more?
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State
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end
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end.
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|
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-spec process_stream_end(stop_reason(), state()) -> state().
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process_stream_end(_, #{stream_state := disconnected} = State) ->
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State;
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process_stream_end(Reason, #{mod := Mod} = State) ->
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State1 = State#{stream_timeout => infinity,
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stream_state => disconnected},
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try Mod:handle_stream_end(Reason, State1)
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catch _:undef -> stop(State1)
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end.
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|
|
-spec process_stream(stream_start(), state()) -> state().
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|
process_stream(#stream_start{xmlns = XML_NS,
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stream_xmlns = STREAM_NS},
|
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#{xmlns := NS} = State)
|
|
when XML_NS /= NS; STREAM_NS /= ?NS_STREAM ->
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send_pkt(State, xmpp:serr_invalid_namespace());
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|
process_stream(#stream_start{version = {N, _}}, State) when N > 1 ->
|
|
send_pkt(State, xmpp:serr_unsupported_version());
|
|
process_stream(#stream_start{lang = Lang},
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|
#{xmlns := ?NS_CLIENT, lang := DefaultLang} = State)
|
|
when size(Lang) > 35 ->
|
|
%% As stated in BCP47, 4.4.1:
|
|
%% Protocols or specifications that specify limited buffer sizes for
|
|
%% language tags MUST allow for language tags of at least 35 characters.
|
|
%% Do not store long language tag to avoid possible DoS/flood attacks
|
|
Txt = <<"Too long value of 'xml:lang' attribute">>,
|
|
send_pkt(State, xmpp:serr_policy_violation(Txt, DefaultLang));
|
|
process_stream(#stream_start{to = undefined, version = Version} = StreamStart,
|
|
#{lang := Lang, server := Server, xmlns := NS} = State) ->
|
|
if Version < {1,0} andalso NS /= ?NS_COMPONENT ->
|
|
%% Work-around for gmail servers
|
|
To = jid:make(Server),
|
|
process_stream(StreamStart#stream_start{to = To}, State);
|
|
true ->
|
|
Txt = <<"Missing 'to' attribute">>,
|
|
send_pkt(State, xmpp:serr_improper_addressing(Txt, Lang))
|
|
end;
|
|
process_stream(#stream_start{to = #jid{luser = U, lresource = R}},
|
|
#{lang := Lang} = State) when U /= <<"">>; R /= <<"">> ->
|
|
Txt = <<"Improper 'to' attribute">>,
|
|
send_pkt(State, xmpp:serr_improper_addressing(Txt, Lang));
|
|
process_stream(#stream_start{to = #jid{lserver = RemoteServer}} = StreamStart,
|
|
#{xmlns := ?NS_COMPONENT, mod := Mod} = State) ->
|
|
State1 = State#{remote_server => RemoteServer,
|
|
stream_state => wait_for_handshake},
|
|
try Mod:handle_stream_start(StreamStart, State1)
|
|
catch _:undef -> State1
|
|
end;
|
|
process_stream(#stream_start{to = #jid{server = Server, lserver = LServer},
|
|
from = From} = StreamStart,
|
|
#{stream_authenticated := Authenticated,
|
|
stream_restarted := StreamWasRestarted,
|
|
mod := Mod, xmlns := NS, resource := Resource,
|
|
stream_encrypted := Encrypted} = State) ->
|
|
State1 = if not StreamWasRestarted ->
|
|
State#{server => Server, lserver => LServer};
|
|
true ->
|
|
State
|
|
end,
|
|
State2 = case From of
|
|
#jid{lserver = RemoteServer} when NS == ?NS_SERVER ->
|
|
State1#{remote_server => RemoteServer};
|
|
_ ->
|
|
State1
|
|
end,
|
|
State3 = try Mod:handle_stream_start(StreamStart, State2)
|
|
catch _:undef -> State2
|
|
end,
|
|
case is_disconnected(State3) of
|
|
true -> State3;
|
|
false ->
|
|
State4 = send_features(State3),
|
|
case is_disconnected(State4) of
|
|
true -> State4;
|
|
false ->
|
|
TLSRequired = is_starttls_required(State4),
|
|
if not Authenticated and (TLSRequired and not Encrypted) ->
|
|
State4#{stream_state => wait_for_starttls};
|
|
not Authenticated ->
|
|
State4#{stream_state => wait_for_sasl_request};
|
|
(NS == ?NS_CLIENT) and (Resource == <<"">>) ->
|
|
State4#{stream_state => wait_for_bind};
|
|
true ->
|
|
process_stream_established(State4)
|
|
end
|
|
end
|
|
end.
|
|
|
|
-spec process_element(xmpp_element(), state()) -> state().
|
|
process_element(Pkt, #{stream_state := StateName, lang := Lang} = State) ->
|
|
case Pkt of
|
|
#starttls{} when StateName == wait_for_starttls;
|
|
StateName == wait_for_sasl_request ->
|
|
process_starttls(State);
|
|
#starttls{} ->
|
|
process_starttls_failure(unexpected_starttls_request, State);
|
|
#sasl_auth{} when StateName == wait_for_starttls ->
|
|
send_pkt(State, #sasl_failure{reason = 'encryption-required'});
|
|
#sasl_auth{} when StateName == wait_for_sasl_request ->
|
|
process_sasl_request(Pkt, State);
|
|
#sasl_auth{} when StateName == wait_for_sasl_response ->
|
|
process_sasl_request(Pkt, maps:remove(sasl_state, State));
|
|
#sasl_auth{} ->
|
|
Txt = <<"SASL negotiation is not allowed in this state">>,
|
|
send_pkt(State, #sasl_failure{reason = 'not-authorized',
|
|
text = xmpp:mk_text(Txt, Lang)});
|
|
#sasl_response{} when StateName == wait_for_starttls ->
|
|
send_pkt(State, #sasl_failure{reason = 'encryption-required'});
|
|
#sasl_response{} when StateName == wait_for_sasl_response ->
|
|
process_sasl_response(Pkt, State);
|
|
#sasl_response{} ->
|
|
Txt = <<"SASL negotiation is not allowed in this state">>,
|
|
send_pkt(State, #sasl_failure{reason = 'not-authorized',
|
|
text = xmpp:mk_text(Txt, Lang)});
|
|
#sasl_abort{} when StateName == wait_for_sasl_response ->
|
|
process_sasl_abort(State);
|
|
#sasl_abort{} ->
|
|
send_pkt(State, #sasl_failure{reason = 'aborted'});
|
|
#sasl_success{} ->
|
|
State;
|
|
#compress{} when StateName == wait_for_sasl_response ->
|
|
send_pkt(State, #compress_failure{reason = 'setup-failed'});
|
|
#compress{} ->
|
|
process_compress(Pkt, State);
|
|
#handshake{} when StateName == wait_for_handshake ->
|
|
process_handshake(Pkt, State);
|
|
#handshake{} ->
|
|
State;
|
|
#stream_error{} ->
|
|
process_stream_end({stream, {in, Pkt}}, State);
|
|
_ when StateName == wait_for_sasl_request;
|
|
StateName == wait_for_handshake;
|
|
StateName == wait_for_sasl_response ->
|
|
process_unauthenticated_packet(Pkt, State);
|
|
_ when StateName == wait_for_starttls ->
|
|
Txt = <<"Use of STARTTLS required">>,
|
|
Err = xmpp:serr_policy_violation(Txt, Lang),
|
|
send_pkt(State, Err);
|
|
_ when StateName == wait_for_bind ->
|
|
process_bind(Pkt, State);
|
|
_ when StateName == established ->
|
|
process_authenticated_packet(Pkt, State)
|
|
end.
|
|
|
|
-spec process_unauthenticated_packet(xmpp_element(), state()) -> state().
|
|
process_unauthenticated_packet(Pkt, #{mod := Mod} = State) ->
|
|
NewPkt = set_lang(Pkt, State),
|
|
try Mod:handle_unauthenticated_packet(NewPkt, State)
|
|
catch _:undef ->
|
|
Err = xmpp:serr_not_authorized(),
|
|
send(State, Err)
|
|
end.
|
|
|
|
-spec process_authenticated_packet(xmpp_element(), state()) -> state().
|
|
process_authenticated_packet(Pkt, #{mod := Mod} = State) ->
|
|
Pkt1 = set_lang(Pkt, State),
|
|
case set_from_to(Pkt1, State) of
|
|
{ok, Pkt2} ->
|
|
try Mod:handle_authenticated_packet(Pkt2, State)
|
|
catch _:undef ->
|
|
Err = xmpp:err_service_unavailable(),
|
|
send_error(State, Pkt, Err)
|
|
end;
|
|
{error, Err} ->
|
|
send_pkt(State, Err)
|
|
end.
|
|
|
|
-spec process_bind(xmpp_element(), state()) -> state().
|
|
process_bind(#iq{type = set, sub_els = [_]} = Pkt,
|
|
#{xmlns := ?NS_CLIENT, mod := Mod} = State) ->
|
|
case xmpp:get_subtag(Pkt, #bind{}) of
|
|
#bind{resource = R} ->
|
|
case Mod:bind(R, State) of
|
|
{ok, #{user := U, server := S, resource := NewR} = State1}
|
|
when NewR /= <<"">> ->
|
|
Reply = #bind{jid = jid:make(U, S, NewR)},
|
|
State2 = send_pkt(State1, xmpp:make_iq_result(Pkt, Reply)),
|
|
process_stream_established(State2);
|
|
{error, #stanza_error{} = Err, State1} ->
|
|
send_error(State1, Pkt, Err)
|
|
end;
|
|
_ ->
|
|
try Mod:handle_unbinded_packet(Pkt, State)
|
|
catch _:undef ->
|
|
Err = xmpp:err_not_authorized(),
|
|
send_error(State, Pkt, Err)
|
|
end
|
|
end;
|
|
process_bind(Pkt, #{mod := Mod} = State) ->
|
|
try Mod:handle_unbinded_packet(Pkt, State)
|
|
catch _:undef ->
|
|
Err = xmpp:err_not_authorized(),
|
|
send_error(State, Pkt, Err)
|
|
end.
|
|
|
|
-spec process_handshake(handshake(), state()) -> state().
|
|
process_handshake(#handshake{data = Digest},
|
|
#{mod := Mod, stream_id := StreamID,
|
|
remote_server := RemoteServer} = State) ->
|
|
GetPW = try Mod:get_password_fun(State)
|
|
catch _:undef -> fun(_) -> {false, undefined} end
|
|
end,
|
|
AuthRes = case GetPW(<<"">>) of
|
|
{false, _} ->
|
|
false;
|
|
{Password, _} ->
|
|
str:sha(<<StreamID/binary, Password/binary>>) == Digest
|
|
end,
|
|
case AuthRes of
|
|
true ->
|
|
State1 = try Mod:handle_auth_success(
|
|
RemoteServer, <<"handshake">>, undefined, State)
|
|
catch _:undef -> State
|
|
end,
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false ->
|
|
State2 = send_pkt(State1, #handshake{}),
|
|
process_stream_established(State2)
|
|
end;
|
|
false ->
|
|
State1 = try Mod:handle_auth_failure(
|
|
RemoteServer, <<"handshake">>, <<"not authorized">>, State)
|
|
catch _:undef -> State
|
|
end,
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false -> send_pkt(State1, xmpp:serr_not_authorized())
|
|
end
|
|
end.
|
|
|
|
-spec process_stream_established(state()) -> state().
|
|
process_stream_established(#{stream_state := StateName} = State)
|
|
when StateName == disconnected; StateName == established ->
|
|
State;
|
|
process_stream_established(#{mod := Mod} = State) ->
|
|
State1 = State#{stream_authenticated := true,
|
|
stream_state => established,
|
|
stream_timeout => infinity},
|
|
try Mod:handle_stream_established(State1)
|
|
catch _:undef -> State1
|
|
end.
|
|
|
|
-spec process_compress(compress(), state()) -> state().
|
|
process_compress(#compress{}, #{stream_compressed := true} = State) ->
|
|
send_pkt(State, #compress_failure{reason = 'setup-failed'});
|
|
process_compress(#compress{methods = HisMethods},
|
|
#{socket := Socket, sockmod := SockMod, mod := Mod} = State) ->
|
|
MyMethods = try Mod:compress_methods(State)
|
|
catch _:undef -> []
|
|
end,
|
|
CommonMethods = lists_intersection(MyMethods, HisMethods),
|
|
case lists:member(<<"zlib">>, CommonMethods) of
|
|
true ->
|
|
case SockMod:compress(Socket) of
|
|
{ok, ZlibSocket} ->
|
|
State1 = send_pkt(State, #compressed{}),
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false ->
|
|
State1#{socket => ZlibSocket,
|
|
stream_id => new_id(),
|
|
stream_header_sent => false,
|
|
stream_restarted => true,
|
|
stream_state => wait_for_stream,
|
|
stream_compressed => true}
|
|
end;
|
|
{error, _} ->
|
|
Err = #compress_failure{reason = 'setup-failed'},
|
|
send_pkt(State, Err)
|
|
end;
|
|
false ->
|
|
send_pkt(State, #compress_failure{reason = 'unsupported-method'})
|
|
end.
|
|
|
|
-spec process_starttls(state()) -> state().
|
|
process_starttls(#{stream_encrypted := true} = State) ->
|
|
process_starttls_failure(already_encrypted, State);
|
|
process_starttls(#{socket := Socket,
|
|
sockmod := SockMod, mod := Mod} = State) ->
|
|
case is_starttls_available(State) of
|
|
true ->
|
|
TLSOpts = try Mod:tls_options(State)
|
|
catch _:undef -> []
|
|
end,
|
|
case SockMod:starttls(Socket, TLSOpts) of
|
|
{ok, TLSSocket} ->
|
|
State1 = send_pkt(State, #starttls_proceed{}),
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false ->
|
|
State1#{socket => TLSSocket,
|
|
stream_id => new_id(),
|
|
stream_header_sent => false,
|
|
stream_restarted => true,
|
|
stream_state => wait_for_stream,
|
|
stream_encrypted => true}
|
|
end;
|
|
{error, Reason} ->
|
|
process_starttls_failure(Reason, State)
|
|
end;
|
|
false ->
|
|
process_starttls_failure(starttls_unsupported, State)
|
|
end.
|
|
|
|
-spec process_starttls_failure(term(), state()) -> state().
|
|
process_starttls_failure(Why, State) ->
|
|
State1 = send_pkt(State, #starttls_failure{}),
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false -> process_stream_end({tls, Why}, State1)
|
|
end.
|
|
|
|
-spec process_sasl_request(sasl_auth(), state()) -> state().
|
|
process_sasl_request(#sasl_auth{mechanism = Mech, text = ClientIn},
|
|
#{mod := Mod, lserver := LServer} = State) ->
|
|
State1 = State#{sasl_mech => Mech},
|
|
Mechs = get_sasl_mechanisms(State1),
|
|
case lists:member(Mech, Mechs) of
|
|
true when Mech == <<"EXTERNAL">> ->
|
|
Res = case xmpp_stream_pkix:authenticate(State1, ClientIn) of
|
|
{ok, Peer} ->
|
|
{ok, [{auth_module, pkix}, {username, Peer}]};
|
|
{error, Reason, Peer} ->
|
|
{error, Reason, Peer}
|
|
end,
|
|
process_sasl_result(Res, State1);
|
|
true ->
|
|
GetPW = try Mod:get_password_fun(State1)
|
|
catch _:undef -> fun(_) -> false end
|
|
end,
|
|
CheckPW = try Mod:check_password_fun(State1)
|
|
catch _:undef -> fun(_, _, _) -> false end
|
|
end,
|
|
CheckPWDigest = try Mod:check_password_digest_fun(State1)
|
|
catch _:undef -> fun(_, _, _, _, _) -> false end
|
|
end,
|
|
SASLState = cyrsasl:server_new(<<"jabber">>, LServer, <<"">>, [],
|
|
GetPW, CheckPW, CheckPWDigest),
|
|
Res = cyrsasl:server_start(SASLState, Mech, ClientIn),
|
|
process_sasl_result(Res, State1#{sasl_state => SASLState});
|
|
false ->
|
|
process_sasl_result({error, unsupported_mechanism, <<"">>}, State1)
|
|
end.
|
|
|
|
-spec process_sasl_response(sasl_response(), state()) -> state().
|
|
process_sasl_response(#sasl_response{text = ClientIn},
|
|
#{sasl_state := SASLState} = State) ->
|
|
SASLResult = cyrsasl:server_step(SASLState, ClientIn),
|
|
process_sasl_result(SASLResult, State).
|
|
|
|
-spec process_sasl_result(cyrsasl:sasl_return(), state()) -> state().
|
|
process_sasl_result({ok, Props}, State) ->
|
|
process_sasl_success(Props, <<"">>, State);
|
|
process_sasl_result({ok, Props, ServerOut}, State) ->
|
|
process_sasl_success(Props, ServerOut, State);
|
|
process_sasl_result({continue, ServerOut, NewSASLState}, State) ->
|
|
process_sasl_continue(ServerOut, NewSASLState, State);
|
|
process_sasl_result({error, Reason, User}, State) ->
|
|
process_sasl_failure(Reason, User, State).
|
|
|
|
-spec process_sasl_success([cyrsasl:sasl_property()], binary(), state()) -> state().
|
|
process_sasl_success(Props, ServerOut,
|
|
#{socket := Socket, sockmod := SockMod,
|
|
mod := Mod, sasl_mech := Mech} = State) ->
|
|
User = identity(Props),
|
|
AuthModule = proplists:get_value(auth_module, Props),
|
|
SockMod:reset_stream(Socket),
|
|
State1 = send_pkt(State, #sasl_success{text = ServerOut}),
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false ->
|
|
State2 = try Mod:handle_auth_success(User, Mech, AuthModule, State1)
|
|
catch _:undef -> State1
|
|
end,
|
|
case is_disconnected(State2) of
|
|
true -> State2;
|
|
false ->
|
|
State3 = maps:remove(sasl_state,
|
|
maps:remove(sasl_mech, State2)),
|
|
State3#{stream_id => new_id(),
|
|
stream_authenticated => true,
|
|
stream_header_sent => false,
|
|
stream_restarted => true,
|
|
stream_state => wait_for_stream,
|
|
user => User}
|
|
end
|
|
end.
|
|
|
|
-spec process_sasl_continue(binary(), cyrsasl:sasl_state(), state()) -> state().
|
|
process_sasl_continue(ServerOut, NewSASLState, State) ->
|
|
State1 = State#{sasl_state => NewSASLState,
|
|
stream_state => wait_for_sasl_response},
|
|
send_pkt(State1, #sasl_challenge{text = ServerOut}).
|
|
|
|
-spec process_sasl_failure(atom(), binary(), state()) -> state().
|
|
process_sasl_failure(Err, User,
|
|
#{mod := Mod, sasl_mech := Mech, lang := Lang} = State) ->
|
|
{Reason, Text} = format_sasl_error(Mech, Err),
|
|
State1 = send_pkt(State, #sasl_failure{reason = Reason,
|
|
text = xmpp:mk_text(Text, Lang)}),
|
|
case is_disconnected(State1) of
|
|
true -> State1;
|
|
false ->
|
|
State2 = try Mod:handle_auth_failure(User, Mech, Text, State1)
|
|
catch _:undef -> State1
|
|
end,
|
|
State3 = maps:remove(sasl_state, maps:remove(sasl_mech, State2)),
|
|
State3#{stream_state => wait_for_sasl_request}
|
|
end.
|
|
|
|
-spec process_sasl_abort(state()) -> state().
|
|
process_sasl_abort(State) ->
|
|
process_sasl_failure(aborted, <<"">>, State).
|
|
|
|
-spec send_features(state()) -> state().
|
|
send_features(#{stream_version := {1,0},
|
|
stream_encrypted := Encrypted} = State) ->
|
|
TLSRequired = is_starttls_required(State),
|
|
Features = if TLSRequired and not Encrypted ->
|
|
get_tls_feature(State);
|
|
true ->
|
|
get_sasl_feature(State) ++ get_compress_feature(State)
|
|
++ get_tls_feature(State) ++ get_bind_feature(State)
|
|
++ get_session_feature(State) ++ get_other_features(State)
|
|
end,
|
|
send_pkt(State, #stream_features{sub_els = Features});
|
|
send_features(State) ->
|
|
%% clients and servers from stone age
|
|
State.
|
|
|
|
-spec get_sasl_mechanisms(state()) -> [cyrsasl:mechanism()].
|
|
get_sasl_mechanisms(#{stream_encrypted := Encrypted, mod := Mod,
|
|
xmlns := NS, lserver := LServer} = State) ->
|
|
Mechs = if NS == ?NS_CLIENT -> cyrsasl:listmech(LServer);
|
|
true -> []
|
|
end,
|
|
TLSVerify = try Mod:tls_verify(State)
|
|
catch _:undef -> false
|
|
end,
|
|
Mechs1 = if Encrypted andalso (TLSVerify orelse NS == ?NS_SERVER) ->
|
|
[<<"EXTERNAL">>|Mechs];
|
|
true ->
|
|
Mechs
|
|
end,
|
|
try Mod:sasl_mechanisms(Mechs1, State)
|
|
catch _:undef -> Mechs1
|
|
end.
|
|
|
|
-spec get_sasl_feature(state()) -> [sasl_mechanisms()].
|
|
get_sasl_feature(#{stream_authenticated := false,
|
|
stream_encrypted := Encrypted} = State) ->
|
|
TLSRequired = is_starttls_required(State),
|
|
if Encrypted or not TLSRequired ->
|
|
Mechs = get_sasl_mechanisms(State),
|
|
[#sasl_mechanisms{list = Mechs}];
|
|
true ->
|
|
[]
|
|
end;
|
|
get_sasl_feature(_) ->
|
|
[].
|
|
|
|
-spec get_compress_feature(state()) -> [compression()].
|
|
get_compress_feature(#{stream_compressed := false, mod := Mod} = State) ->
|
|
try Mod:compress_methods(State) of
|
|
[] -> [];
|
|
Ms -> [#compression{methods = Ms}]
|
|
catch _:undef ->
|
|
[]
|
|
end;
|
|
get_compress_feature(_) ->
|
|
[].
|
|
|
|
-spec get_tls_feature(state()) -> [starttls()].
|
|
get_tls_feature(#{stream_authenticated := false,
|
|
stream_encrypted := false} = State) ->
|
|
case is_starttls_available(State) of
|
|
true ->
|
|
TLSRequired = is_starttls_required(State),
|
|
[#starttls{required = TLSRequired}];
|
|
false ->
|
|
[]
|
|
end;
|
|
get_tls_feature(_) ->
|
|
[].
|
|
|
|
-spec get_bind_feature(state()) -> [bind()].
|
|
get_bind_feature(#{xmlns := ?NS_CLIENT,
|
|
stream_authenticated := true,
|
|
resource := <<"">>}) ->
|
|
[#bind{}];
|
|
get_bind_feature(_) ->
|
|
[].
|
|
|
|
-spec get_session_feature(state()) -> [xmpp_session()].
|
|
get_session_feature(#{xmlns := ?NS_CLIENT,
|
|
stream_authenticated := true,
|
|
resource := <<"">>}) ->
|
|
[#xmpp_session{optional = true}];
|
|
get_session_feature(_) ->
|
|
[].
|
|
|
|
-spec get_other_features(state()) -> [xmpp_element()].
|
|
get_other_features(#{stream_authenticated := Auth, mod := Mod} = State) ->
|
|
try
|
|
if Auth -> Mod:authenticated_stream_features(State);
|
|
true -> Mod:unauthenticated_stream_features(State)
|
|
end
|
|
catch _:undef ->
|
|
[]
|
|
end.
|
|
|
|
-spec is_starttls_available(state()) -> boolean().
|
|
is_starttls_available(#{mod := Mod} = State) ->
|
|
try Mod:tls_enabled(State)
|
|
catch _:undef -> true
|
|
end.
|
|
|
|
-spec is_starttls_required(state()) -> boolean().
|
|
is_starttls_required(#{mod := Mod} = State) ->
|
|
try Mod:tls_required(State)
|
|
catch _:undef -> false
|
|
end.
|
|
|
|
-spec set_from_to(xmpp_element(), state()) -> {ok, xmpp_element()} |
|
|
{error, stream_error()}.
|
|
set_from_to(Pkt, _State) when not ?is_stanza(Pkt) ->
|
|
{ok, Pkt};
|
|
set_from_to(Pkt, #{user := U, server := S, resource := R,
|
|
lang := Lang, xmlns := ?NS_CLIENT}) ->
|
|
JID = jid:make(U, S, R),
|
|
From = case xmpp:get_from(Pkt) of
|
|
undefined -> JID;
|
|
F -> F
|
|
end,
|
|
if JID#jid.luser == From#jid.luser andalso
|
|
JID#jid.lserver == From#jid.lserver andalso
|
|
(JID#jid.lresource == From#jid.lresource
|
|
orelse From#jid.lresource == <<"">>) ->
|
|
To = case xmpp:get_to(Pkt) of
|
|
undefined -> jid:make(U, S);
|
|
T -> T
|
|
end,
|
|
{ok, xmpp:set_from_to(Pkt, JID, To)};
|
|
true ->
|
|
Txt = <<"Improper 'from' attribute">>,
|
|
{error, xmpp:serr_invalid_from(Txt, Lang)}
|
|
end;
|
|
set_from_to(Pkt, #{lang := Lang}) ->
|
|
From = xmpp:get_from(Pkt),
|
|
To = xmpp:get_to(Pkt),
|
|
if From == undefined ->
|
|
Txt = <<"Missing 'from' attribute">>,
|
|
{error, xmpp:serr_improper_addressing(Txt, Lang)};
|
|
To == undefined ->
|
|
Txt = <<"Missing 'to' attribute">>,
|
|
{error, xmpp:serr_improper_addressing(Txt, Lang)};
|
|
true ->
|
|
{ok, Pkt}
|
|
end.
|
|
|
|
-spec send_header(state()) -> state().
|
|
send_header(#{stream_version := Version} = State) ->
|
|
send_header(State, #stream_start{version = Version}).
|
|
|
|
-spec send_header(state(), stream_start()) -> state().
|
|
send_header(#{stream_id := StreamID,
|
|
stream_version := MyVersion,
|
|
stream_header_sent := false,
|
|
lang := MyLang,
|
|
xmlns := NS} = State,
|
|
#stream_start{to = HisTo, from = HisFrom,
|
|
lang = HisLang, version = HisVersion}) ->
|
|
Lang = select_lang(MyLang, HisLang),
|
|
NS_DB = if NS == ?NS_SERVER -> ?NS_SERVER_DIALBACK;
|
|
true -> <<"">>
|
|
end,
|
|
Version = case HisVersion of
|
|
undefined -> undefined;
|
|
{0,_} -> HisVersion;
|
|
_ -> MyVersion
|
|
end,
|
|
StreamStart = #stream_start{version = Version,
|
|
lang = Lang,
|
|
xmlns = NS,
|
|
stream_xmlns = ?NS_STREAM,
|
|
db_xmlns = NS_DB,
|
|
id = StreamID,
|
|
to = HisFrom,
|
|
from = HisTo},
|
|
State1 = State#{lang => Lang,
|
|
stream_version => Version,
|
|
stream_header_sent => true},
|
|
case socket_send(State1, StreamStart) of
|
|
ok -> State1;
|
|
{error, Why} -> process_stream_end({socket, Why}, State1)
|
|
end;
|
|
send_header(State, _) ->
|
|
State.
|
|
|
|
-spec send_pkt(state(), xmpp_element() | xmlel()) -> state().
|
|
send_pkt(#{mod := Mod} = State, Pkt) ->
|
|
Result = socket_send(State, Pkt),
|
|
State1 = try Mod:handle_send(Pkt, Result, State)
|
|
catch _:undef -> State
|
|
end,
|
|
case Result of
|
|
_ when is_record(Pkt, stream_error) ->
|
|
process_stream_end({stream, {out, Pkt}}, State1);
|
|
ok ->
|
|
State1;
|
|
{error, Why} ->
|
|
process_stream_end({socket, Why}, State1)
|
|
end.
|
|
|
|
-spec send_error(state(), xmpp_element() | xmlel(), stanza_error()) -> state().
|
|
send_error(State, Pkt, Err) ->
|
|
case xmpp:is_stanza(Pkt) of
|
|
true ->
|
|
case xmpp:get_type(Pkt) of
|
|
result -> State;
|
|
error -> State;
|
|
<<"result">> -> State;
|
|
<<"error">> -> State;
|
|
_ ->
|
|
ErrPkt = xmpp:make_error(Pkt, Err),
|
|
send_pkt(State, ErrPkt)
|
|
end;
|
|
false ->
|
|
State
|
|
end.
|
|
|
|
-spec send_trailer(state()) -> state().
|
|
send_trailer(State) ->
|
|
socket_send(State, trailer),
|
|
close_socket(State).
|
|
|
|
-spec socket_send(state(), xmpp_element() | xmlel() | trailer) -> ok | {error, inet:posix()}.
|
|
socket_send(#{socket := Sock, sockmod := SockMod,
|
|
stream_state := StateName,
|
|
xmlns := NS,
|
|
stream_header_sent := true}, Pkt) ->
|
|
case Pkt of
|
|
trailer ->
|
|
SockMod:send_trailer(Sock);
|
|
#stream_start{} when StateName /= disconnected ->
|
|
SockMod:send_header(Sock, xmpp:encode(Pkt));
|
|
_ when StateName /= disconnected ->
|
|
SockMod:send_element(Sock, xmpp:encode(Pkt, NS));
|
|
_ ->
|
|
{error, closed}
|
|
end;
|
|
socket_send(_, _) ->
|
|
{error, closed}.
|
|
|
|
-spec close_socket(state()) -> state().
|
|
close_socket(#{sockmod := SockMod, socket := Socket} = State) ->
|
|
SockMod:close(Socket),
|
|
State#{stream_timeout => infinity,
|
|
stream_state => disconnected}.
|
|
|
|
-spec select_lang(binary(), binary()) -> binary().
|
|
select_lang(Lang, <<"">>) -> Lang;
|
|
select_lang(_, Lang) -> Lang.
|
|
|
|
-spec set_lang(xmpp_element(), state()) -> xmpp_element().
|
|
set_lang(Pkt, #{lang := MyLang, xmlns := ?NS_CLIENT}) when ?is_stanza(Pkt) ->
|
|
HisLang = xmpp:get_lang(Pkt),
|
|
Lang = select_lang(MyLang, HisLang),
|
|
xmpp:set_lang(Pkt, Lang);
|
|
set_lang(Pkt, _) ->
|
|
Pkt.
|
|
|
|
-spec format_inet_error(atom()) -> string().
|
|
format_inet_error(closed) ->
|
|
"connection closed";
|
|
format_inet_error(Reason) ->
|
|
case inet:format_error(Reason) of
|
|
"unknown POSIX error" -> atom_to_list(Reason);
|
|
Txt -> Txt
|
|
end.
|
|
|
|
-spec format_stream_error(atom() | 'see-other-host'(), undefined | text()) -> string().
|
|
format_stream_error(Reason, Txt) ->
|
|
Slogan = case Reason of
|
|
undefined -> "no reason";
|
|
#'see-other-host'{} -> "see-other-host";
|
|
_ -> atom_to_list(Reason)
|
|
end,
|
|
case Txt of
|
|
undefined -> Slogan;
|
|
#text{data = <<"">>} -> Slogan;
|
|
#text{data = Data} ->
|
|
binary_to_list(Data) ++ " (" ++ Slogan ++ ")"
|
|
end.
|
|
|
|
-spec format_sasl_error(cyrsasl:mechanism(), atom()) -> {atom(), binary()}.
|
|
format_sasl_error(<<"EXTERNAL">>, Err) ->
|
|
xmpp_stream_pkix:format_error(Err);
|
|
format_sasl_error(Mech, Err) ->
|
|
cyrsasl:format_error(Mech, Err).
|
|
|
|
-spec format_tls_error(atom() | binary()) -> list().
|
|
format_tls_error(Reason) when is_atom(Reason) ->
|
|
format_inet_error(Reason);
|
|
format_tls_error(Reason) ->
|
|
Reason.
|
|
|
|
-spec format(io:format(), list()) -> binary().
|
|
format(Fmt, Args) ->
|
|
iolist_to_binary(io_lib:format(Fmt, Args)).
|
|
|
|
-spec lists_intersection(list(), list()) -> list().
|
|
lists_intersection(L1, L2) ->
|
|
lists:filter(
|
|
fun(E) ->
|
|
lists:member(E, L2)
|
|
end, L1).
|
|
|
|
-spec identity([cyrsasl:sasl_property()]) -> binary().
|
|
identity(Props) ->
|
|
case proplists:get_value(authzid, Props, <<>>) of
|
|
<<>> -> proplists:get_value(username, Props, <<>>);
|
|
AuthzId -> AuthzId
|
|
end.
|