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xmpp_stream_in.erl
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xmpp_stream_in.erl
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%%%-------------------------------------------------------------------
%%%
%%% Copyright (C) 2002-2021 ProcessOne, SARL. All Rights Reserved.
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%%-------------------------------------------------------------------
-module(xmpp_stream_in).
-define(GEN_SERVER, p1_server).
-behaviour(?GEN_SERVER).
-protocol({rfc, 6120}).
-protocol({xep, 114, '1.6'}).
%% API
-export([start/3, start_link/3, call/3, cast/2, reply/2, stop/1, stop_async/1,
accept/1, send/2, close/1, close/2, send_error/3, establish/1,
get_transport/1, change_shaper/2, set_timeout/2, format_error/1,
send_ws_ping/1]).
%% gen_server callbacks
-export([init/1, handle_cast/2, handle_call/3, handle_info/2,
terminate/2, code_change/3]).
-deprecated([{stop, 1}]).
%%-define(DBGFSM, true).
-ifdef(DBGFSM).
-define(FSMOPTS, [{debug, [trace]}]).
-else.
-define(FSMOPTS, []).
-endif.
-include("xmpp.hrl").
-type state() :: #{owner := pid(),
mod := module(),
socket := xmpp_socket:socket(),
socket_mod => xmpp_socket:sockmod(),
socket_opts => [proplists:property()],
socket_monitor => reference(),
stream_timeout := {integer(), integer()} | infinity,
stream_state := stream_state(),
stream_direction => in | out,
stream_id => binary(),
stream_header_sent => boolean(),
stream_restarted => boolean(),
stream_compressed => boolean(),
stream_encrypted => boolean(),
stream_version => {non_neg_integer(), non_neg_integer()},
stream_authenticated => boolean(),
ip => {inet:ip_address(), inet:port_number()},
codec_options => [xmpp:decode_option()],
xmlns => binary(),
lang => binary(),
user => binary(),
server => binary(),
resource => binary(),
lserver => binary(),
remote_server => binary(),
sasl_mech => binary(),
sasl_state => xmpp_sasl:sasl_state(),
_ => _}.
-type stream_state() :: accepting | wait_for_stream | wait_for_handshake |
wait_for_starttls | wait_for_sasl_request |
wait_for_sasl_response | wait_for_bind |
established | disconnected.
-type stop_reason() :: {stream, reset | {in | out, stream_error()}} |
{tls, inet:posix() | atom() | binary()} |
{socket, inet:posix() | atom()} |
internal_failure.
-type noreply() :: {noreply, state(), timeout()}.
-type next_state() :: noreply() | {stop, term(), state()}.
-export_type([state/0, stop_reason/0]).
-callback init(list()) -> {ok, state()} | {error, term()} | ignore.
-callback handle_cast(term(), state()) -> state().
-callback handle_call(term(), term(), state()) -> state().
-callback handle_info(term(), state()) -> state().
-callback terminate(term(), state()) -> any().
-callback code_change(term(), state(), term()) -> {ok, state()} | {error, term()}.
-callback handle_stream_start(stream_start(), state()) -> state().
-callback handle_stream_established(state()) -> state().
-callback handle_stream_end(stop_reason(), state()) -> state().
-callback handle_cdata(binary(), state()) -> state().
-callback handle_unauthenticated_packet(xmpp_element(), state()) -> state().
-callback handle_authenticated_packet(xmpp_element(), state()) -> state().
-callback handle_unbinded_packet(xmpp_element(), state()) -> state().
-callback handle_auth_success(binary(), binary(), module(), state()) -> state().
-callback handle_auth_failure(binary(), binary(), binary(), state()) -> state().
-callback handle_send(xmpp_element(), ok | {error, inet:posix()}, state()) -> state().
-callback handle_recv(fxml:xmlel(), xmpp_element() | {error, term()}, state()) -> state().
-callback handle_timeout(state()) -> state().
-callback get_password_fun(state()) -> fun().
-callback get_password_fun(xmpp_sasl:mechanism(), state()) -> fun().
-callback check_password_fun(xmpp_sasl:mechanism(), state()) -> fun().
-callback check_password_digest_fun(xmpp_sasl:mechanism(), state()) -> fun().
-callback bind(binary(), state()) -> {ok, state()} | {error, stanza_error(), state()}.
-callback compress_methods(state()) -> [binary()].
-callback tls_options(state()) -> [proplists:property()].
-callback tls_required(state()) -> boolean().
-callback tls_enabled(state()) -> boolean().
-callback sasl_mechanisms([xmpp_sasl:mechanism()], state()) -> [xmpp_sasl:mechanism()].
-callback unauthenticated_stream_features(state()) -> [xmpp_element()].
-callback authenticated_stream_features(state()) -> [xmpp_element()].
%% All callbacks are optional
-optional_callbacks([init/1,
handle_cast/2,
handle_call/3,
handle_info/2,
terminate/2,
code_change/3,
handle_stream_start/2,
handle_stream_established/1,
handle_stream_end/2,
handle_cdata/2,
handle_authenticated_packet/2,
handle_unauthenticated_packet/2,
handle_unbinded_packet/2,
handle_auth_success/4,
handle_auth_failure/4,
handle_send/3,
handle_recv/3,
handle_timeout/1,
get_password_fun/1,
get_password_fun/2,
check_password_fun/2,
check_password_digest_fun/2,
bind/2,
compress_methods/1,
tls_options/1,
tls_required/1,
tls_enabled/1,
sasl_mechanisms/2,
unauthenticated_stream_features/1,
authenticated_stream_features/1]).
%%%===================================================================
%%% API
%%%===================================================================
start(Mod, Args, Opts) ->
?GEN_SERVER:start(?MODULE, [Mod|Args], Opts ++ ?FSMOPTS).
start_link(Mod, Args, Opts) ->
?GEN_SERVER:start_link(?MODULE, [Mod|Args], Opts ++ ?FSMOPTS).
call(Ref, Msg, Timeout) ->
?GEN_SERVER:call(Ref, Msg, Timeout).
cast(Ref, Msg) ->
?GEN_SERVER:cast(Ref, Msg).
reply(Ref, Reply) ->
?GEN_SERVER:reply(Ref, Reply).
-spec stop(pid()) -> ok;
(state()) -> no_return().
stop(Pid) when is_pid(Pid) ->
stop_async(Pid);
stop(#{owner := Owner} = State) when Owner == self() ->
terminate(normal, State),
try erlang:nif_error(normal)
catch _:_ -> exit(normal)
end;
stop(_) ->
erlang:error(badarg).
-spec stop_async(pid()) -> ok.
stop_async(Pid) when is_pid(Pid) ->
cast(Pid, stop);
stop_async(_) ->
erlang:error(badarg).
-spec accept(pid()) -> ok.
accept(Pid) ->
cast(Pid, accept).
-spec send(pid(), xmpp_element()) -> ok;
(state(), xmpp_element()) -> state().
send(Pid, Pkt) when is_pid(Pid) ->
cast(Pid, {send, Pkt});
send(#{owner := Owner} = State, Pkt) when Owner == self() ->
send_pkt(State, Pkt);
send(_, _) ->
erlang:error(badarg).
-spec send_ws_ping(pid()) -> ok;
(state()) -> state().
send_ws_ping(Pid) when is_pid(Pid) ->
cast(Pid, send_ws_ping);
send_ws_ping(#{owner := Owner, socket := Sock,
stream_header_sent := true} = State)
when Owner == self() ->
case xmpp_socket:send_ws_ping(Sock) of
ok ->
State;
{error, Why} ->
process_stream_end({socket, Why}, State)
end;
send_ws_ping(State) ->
State.
-spec close(pid()) -> ok;
(state()) -> state().
close(Pid) when is_pid(Pid) ->
close(Pid, closed);
close(#{owner := Owner} = State) when Owner == self() ->
close_socket(State);
close(_) ->
erlang:error(badarg).
-spec close(pid(), atom()) -> ok.
close(Pid, Reason) ->
cast(Pid, {close, Reason}).
-spec establish(state()) -> state().
establish(State) ->
process_stream_established(State).
-spec set_timeout(state(), non_neg_integer() | infinity) -> state().
set_timeout(#{owner := Owner} = State, Timeout) when Owner == self() ->
case Timeout of
infinity -> State#{stream_timeout => infinity};
_ ->
Time = p1_time_compat:monotonic_time(milli_seconds),
State#{stream_timeout => {Timeout, Time}}
end;
set_timeout(_, _) ->
erlang:error(badarg).
-spec get_transport(state()) -> atom().
get_transport(#{socket := Socket, owner := Owner})
when Owner == self() ->
xmpp_socket:get_transport(Socket);
get_transport(_) ->
erlang:error(badarg).
-spec change_shaper(state(), none | p1_shaper:state()) -> state().
change_shaper(#{socket := Socket, owner := Owner} = State, Shaper)
when Owner == self() ->
Socket1 = xmpp_socket:change_shaper(Socket, Shaper),
State#{socket => Socket1};
change_shaper(_, _) ->
erlang:error(badarg).
-spec format_error(stop_reason()) -> binary().
format_error({socket, Reason}) ->
format("Connection failed: ~s", [format_inet_error(Reason)]);
format_error({stream, reset}) ->
<<"Stream reset by peer">>;
format_error({stream, {in, #stream_error{} = Err}}) ->
format("Stream closed by peer: ~s", [xmpp:format_stream_error(Err)]);
format_error({stream, {out, #stream_error{} = Err}}) ->
format("Stream closed by local host: ~s", [xmpp:format_stream_error(Err)]);
format_error({tls, Reason}) ->
format("TLS failed: ~s", [format_tls_error(Reason)]);
format_error(internal_failure) ->
<<"Internal server error">>;
format_error(Err) ->
format("Unrecognized error: ~w", [Err]).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
init([Mod, {SockMod, Socket}, Opts]) ->
Time = p1_time_compat:monotonic_time(milli_seconds),
Timeout = timer:seconds(30),
State = #{owner => self(),
mod => Mod,
socket => Socket,
socket_mod => SockMod,
socket_opts => Opts,
stream_timeout => {Timeout, Time},
stream_state => accepting},
{ok, State, Timeout}.
-spec handle_cast(term(), state()) -> next_state().
handle_cast(accept, #{socket := Socket,
socket_mod := SockMod,
socket_opts := Opts} = State) ->
XMPPSocket = xmpp_socket:new(SockMod, Socket, Opts),
SocketMonitor = xmpp_socket:monitor(XMPPSocket),
case xmpp_socket:peername(XMPPSocket) of
{ok, IP} ->
State1 = maps:remove(socket_mod, State),
State2 = maps:remove(socket_opts, State1),
State3 = State2#{socket => XMPPSocket,
socket_monitor => SocketMonitor,
ip => IP},
case init_state(State3, Opts) of
{stop, State4} ->
{stop, normal, State4};
State4 ->
case is_disconnected(State4) of
true -> noreply(State4);
false -> handle_info({tcp, Socket, <<>>}, State4)
end
end;
{error, _} ->
{stop, normal, State}
end;
handle_cast({send, Pkt}, State) ->
noreply(send_pkt(State, Pkt));
handle_cast(send_ws_ping, State) ->
noreply(send_ws_ping(State));
handle_cast(release_socket, State) ->
erlang:demonitor(maps:get(socket_monitor, State, make_ref())),
State2 = maps:remove(socket, State),
State3 = maps:remove(socket_monitor, State2),
noreply(State3);
handle_cast(stop, State) ->
{stop, normal, State};
handle_cast({close, Reason}, State) ->
State1 = close_socket(State),
noreply(
case is_disconnected(State) of
true -> State1;
false -> process_stream_end({socket, Reason}, State)
end);
handle_cast(Cast, State) ->
noreply(try callback(handle_cast, Cast, State)
catch _:{?MODULE, undef} -> State
end).
-spec handle_call(term(), term(), state()) -> next_state().
handle_call(Call, From, State) ->
noreply(try callback(handle_call, Call, From, State)
catch _:{?MODULE, undef} -> State
end).
-spec handle_info(term(), state()) -> next_state().
handle_info(_, #{stream_state := accepting} = State) ->
{stop, normal, State};
handle_info({'$gen_event', {xmlstreamstart, Name, Attrs}},
#{stream_state := wait_for_stream,
xmlns := XMLNS, lang := MyLang} = State) ->
El = #xmlel{name = Name, attrs = Attrs},
noreply(
try xmpp:decode(El, XMLNS, []) of
#stream_start{} = Pkt ->
State1 = send_header(State, Pkt),
case is_disconnected(State1) of
true -> State1;
false -> process_stream(Pkt, State1)
end;
_ ->
State1 = send_header(State),
case is_disconnected(State1) of
true -> State1;
false -> send_pkt(State1, xmpp:serr_invalid_xml())
end
catch _:{xmpp_codec, Why} ->
State1 = send_header(State),
case is_disconnected(State1) of
true -> State1;
false ->
Txt = xmpp:io_format_error(Why),
Lang = select_lang(MyLang, xmpp:get_lang(El)),
Err = xmpp:serr_invalid_xml(Txt, Lang),
send_pkt(State1, Err)
end
end);
handle_info({'$gen_event', {xmlstreamend, _}}, State) ->
noreply(process_stream_end({stream, reset}, State));
handle_info({'$gen_event', closed}, State) ->
noreply(process_stream_end({socket, closed}, State));
handle_info({'$gen_event', {xmlstreamerror, Reason}}, #{lang := Lang}= State) ->
State1 = send_header(State),
noreply(
case is_disconnected(State1) of
true -> State1;
false ->
Err = case Reason of
<<"XML stanza is too big">> ->
xmpp:serr_policy_violation(Reason, Lang);
{_, Txt} ->
xmpp:serr_not_well_formed(Txt, Lang)
end,
send_pkt(State1, Err)
end);
handle_info({'$gen_event', El}, #{stream_state := wait_for_stream} = State) ->
error_logger:warning_msg("unexpected event from XML driver: ~p; "
"xmlstreamstart was expected", [El]),
State1 = send_header(State),
noreply(
case is_disconnected(State1) of
true -> State1;
false -> send_pkt(State1, xmpp:serr_invalid_xml())
end);
handle_info({'$gen_event', {xmlstreamelement, El}},
#{xmlns := NS, codec_options := Opts} = State) ->
noreply(
try xmpp:decode(El, NS, Opts) of
Pkt ->
State1 = try callback(handle_recv, El, Pkt, State)
catch _:{?MODULE, undef} -> State
end,
case is_disconnected(State1) of
true -> State1;
false -> process_element(Pkt, State1)
end
catch _:{xmpp_codec, Why} ->
State1 = try callback(handle_recv, El, {error, Why}, State)
catch _:{?MODULE, undef} -> State
end,
case is_disconnected(State1) of
true -> State1;
false -> process_invalid_xml(State1, El, Why)
end
end);
handle_info({'$gen_all_state_event', {xmlstreamcdata, Data}},
State) ->
noreply(try callback(handle_cdata, Data, State)
catch _:{?MODULE, undef} -> State
end);
handle_info(timeout, #{lang := Lang} = State) ->
Disconnected = is_disconnected(State),
noreply(try callback(handle_timeout, State)
catch _:{?MODULE, undef} when not Disconnected ->
Txt = <<"Idle connection">>,
send_pkt(State, xmpp:serr_connection_timeout(Txt, Lang));
_:{?MODULE, undef} ->
{stop, normal, State}
end);
handle_info({'DOWN', MRef, _Type, _Object, _Info},
#{socket_monitor := MRef} = State) ->
noreply(process_stream_end({socket, closed}, State));
handle_info({tcp, _, Data}, #{socket := Socket} = State) ->
noreply(
case xmpp_socket:recv(Socket, Data) of
{ok, NewSocket} ->
State#{socket => NewSocket};
{error, Reason} when is_atom(Reason) ->
process_stream_end({socket, Reason}, State);
{error, Reason} ->
%% TODO: make fast_tls return atoms
process_stream_end({tls, Reason}, State)
end);
% Skip new tcp messages after socket get removed from state
handle_info({tcp, _, _}, State) ->
noreply(State);
handle_info({tcp_closed, _}, State) ->
handle_info({'$gen_event', closed}, State);
handle_info({tcp_error, _, Reason}, State) ->
noreply(process_stream_end({socket, Reason}, State));
handle_info(Info, State) ->
noreply(try callback(handle_info, Info, State)
catch _:{?MODULE, undef} -> State
end).
-spec terminate(term(), state()) -> state().
terminate(_, #{stream_state := accepting} = State) ->
State;
terminate(Reason, State) ->
case get(already_terminated) of
true ->
State;
_ ->
put(already_terminated, true),
try callback(terminate, Reason, State)
catch _:{?MODULE, undef} -> ok
end,
send_trailer(State)
end.
-spec code_change(term(), state(), term()) -> {ok, state()} | {error, term()}.
code_change(OldVsn, State, Extra) ->
callback(code_change, OldVsn, State, Extra).
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec init_state(state(), [proplists:property()]) -> state() | {stop, state()}.
init_state(#{socket := Socket, mod := Mod} = State, Opts) ->
Encrypted = proplists:get_bool(tls, Opts),
State1 = State#{stream_direction => in,
stream_id => xmpp_stream:new_id(),
stream_state => wait_for_stream,
stream_header_sent => false,
stream_restarted => false,
stream_compressed => false,
stream_encrypted => Encrypted,
stream_version => {1,0},
stream_authenticated => false,
codec_options => [ignore_els],
xmlns => ?NS_CLIENT,
lang => <<"">>,
user => <<"">>,
server => <<"">>,
resource => <<"">>,
lserver => <<"">>},
case try Mod:init([State1, Opts])
catch _:undef -> {ok, State1}
end of
{ok, State2} when not Encrypted ->
State2;
{ok, State2} when Encrypted ->
TLSOpts = try callback(tls_options, State2)
catch _:{?MODULE, undef} -> []
end,
case xmpp_socket:starttls(Socket, TLSOpts) of
{ok, TLSSocket} ->
State2#{socket => TLSSocket};
{error, Reason} ->
process_stream_end({tls, Reason}, State2)
end;
{error, Reason} ->
process_stream_end(Reason, State1);
ignore ->
{stop, State}
end.
-spec noreply(state()) -> noreply();
({stop, state()}) -> {stop, normal, state()}.
noreply({stop, State}) ->
{stop, normal, State};
noreply(#{stream_timeout := infinity} = State) ->
{noreply, State, infinity};
noreply(#{stream_timeout := {MSecs, StartTime}} = State) ->
CurrentTime = p1_time_compat:monotonic_time(milli_seconds),
Timeout = max(0, MSecs - CurrentTime + StartTime),
{noreply, State, Timeout}.
-spec is_disconnected(state()) -> boolean().
is_disconnected(#{stream_state := StreamState}) ->
StreamState == disconnected.
-spec process_invalid_xml(state(), fxml:xmlel(), term()) -> state().
process_invalid_xml(#{lang := MyLang} = State, El, Reason) ->
case xmpp:is_stanza(El) of
true ->
Txt = xmpp:io_format_error(Reason),
Lang = select_lang(MyLang, xmpp:get_lang(El)),
send_error(State, El, xmpp:err_bad_request(Txt, Lang));
false ->
case {xmpp:get_name(El), xmpp:get_ns(El)} of
{Tag, ?NS_SASL} when Tag == <<"auth">>;
Tag == <<"response">>;
Tag == <<"abort">> ->
Txt = xmpp:io_format_error(Reason),
Err = #sasl_failure{reason = 'malformed-request',
text = xmpp:mk_text(Txt, MyLang)},
send_pkt(State, Err);
{<<"starttls">>, ?NS_TLS} ->
send_pkt(State, #starttls_failure{});
{<<"compress">>, ?NS_COMPRESS} ->
Err = #compress_failure{reason = 'setup-failed'},
send_pkt(State, Err);
_ ->
%% Maybe add something more?
State
end
end.
-spec process_stream_end(stop_reason(), state()) -> state().
process_stream_end(_, #{stream_state := disconnected} = State) ->
State;
process_stream_end(Reason, State) ->
State1 = State#{stream_timeout => infinity,
stream_state => disconnected},
try
State2 = callback(handle_stream_end, Reason, State1),
cast(self(), release_socket),
State2
catch _:{?MODULE, undef} ->
stop_async(self()),
State1
end.
-spec process_stream(stream_start(), state()) -> state().
process_stream(#stream_start{xmlns = XML_NS,
stream_xmlns = STREAM_NS},
#{xmlns := NS} = State)
when XML_NS /= NS; STREAM_NS /= ?NS_STREAM ->
send_pkt(State, xmpp:serr_invalid_namespace());
process_stream(#stream_start{version = {N, _}}, State) when N > 1 ->
send_pkt(State, xmpp:serr_unsupported_version());
process_stream(#stream_start{lang = Lang},
#{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} = State) ->
State1 = State#{remote_server => RemoteServer,
stream_state => wait_for_handshake},
try callback(handle_stream_start, StreamStart, State1)
catch _:{?MODULE, undef} -> State1
end;
process_stream(#stream_start{to = #jid{server = Server, lserver = LServer},
from = From} = StreamStart,
#{stream_authenticated := Authenticated,
stream_restarted := StreamWasRestarted,
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 callback(handle_stream_start, StreamStart, State2)
catch _:{?MODULE, 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{} ->
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, State) ->
NewPkt = set_lang(Pkt, State),
try callback(handle_unauthenticated_packet, NewPkt, State)
catch _:{?MODULE, undef} ->
Err = xmpp:serr_not_authorized(),
send(State, Err)
end.
-spec process_authenticated_packet(xmpp_element(), state()) -> state().
process_authenticated_packet(Pkt, State) ->
Pkt1 = set_lang(Pkt, State),
case set_from_to(Pkt1, State) of
{ok, Pkt2} ->
try callback(handle_authenticated_packet, Pkt2, State)
catch _:{?MODULE, 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, lang := MyLang} = State) ->
try xmpp:try_subtag(Pkt, #bind{}) of
#bind{resource = R} ->
case callback(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 callback(handle_unbinded_packet, Pkt, State)
catch _:{?MODULE, undef} ->
Err = xmpp:err_not_authorized(),
send_error(State, Pkt, Err)
end
catch _:{xmpp_codec, Why} ->
Txt = xmpp:io_format_error(Why),
Lang = select_lang(MyLang, xmpp:get_lang(Pkt)),
Err = xmpp:err_bad_request(Txt, Lang),
send_error(State, Pkt, Err)
end;
process_bind(Pkt, State) ->
try callback(handle_unbinded_packet, Pkt, State)
catch _:{?MODULE, undef} ->
Err = xmpp:err_not_authorized(),
send_error(State, Pkt, Err)
end.
-spec process_handshake(handshake(), state()) -> state().
process_handshake(#handshake{data = Digest},
#{stream_id := StreamID,
remote_server := RemoteServer} = State) ->
GetPW = get_password_fun(State),
AuthRes = case GetPW(<<"">>) of
{false, _} ->
false;
{Password, _} ->
sha(<<StreamID/binary, Password/binary>>) == Digest
end,
case AuthRes of
true ->
State1 = try callback(handle_auth_success,
RemoteServer, <<"handshake">>, undefined, State)
catch _:{?MODULE, undef} -> State
end,
case is_disconnected(State1) of
true -> State1;
false ->
State2 = send_pkt(State1, #handshake{}),
process_stream_established(State2)
end;
false ->
State1 = try callback(handle_auth_failure,
RemoteServer, <<"handshake">>, <<"not authorized">>, State)
catch _:{?MODULE, 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(State) ->
State1 = State#{stream_authenticated => true,
stream_state => established,
stream_timeout => infinity},
try callback(handle_stream_established, State1)
catch _:{?MODULE, undef} -> State1
end.
-spec process_compress(compress(), state()) -> state().
process_compress(#compress{},
#{stream_compressed := Compressed,
stream_authenticated := Authenticated} = State)
when Compressed or not Authenticated ->
send_pkt(State, #compress_failure{reason = 'setup-failed'});
process_compress(#compress{methods = HisMethods},
#{socket := Socket} = State) ->
MyMethods = try callback(compress_methods, State)
catch _:{?MODULE, undef} -> []
end,
CommonMethods = lists_intersection(MyMethods, HisMethods),
case lists:member(<<"zlib">>, CommonMethods) of
true ->
case xmpp_socket:compress(Socket) of
{ok, ZlibSocket} ->
State1 = send_pkt(State, #compressed{}),
case is_disconnected(State1) of
true -> State1;
false ->
State1#{socket => ZlibSocket,
stream_id => xmpp_stream: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} = State) ->
case is_starttls_available(State) of
true ->
TLSOpts = try callback(tls_options, State)
catch _:{?MODULE, undef} -> []
end,
case xmpp_socket: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 => xmpp_stream: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},
#{lserver := LServer, socket := Socket} = 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 = get_password_fun(Mech, State1),
CheckPW = check_password_fun(Mech, State1),
CheckPWDigest = check_password_digest_fun(Mech, State1),
SASLState = xmpp_sasl:server_new(LServer, GetPW, CheckPW, CheckPWDigest),
Res = xmpp_sasl:server_start(SASLState, Mech, ClientIn, Socket),
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 = xmpp_sasl:server_step(SASLState, ClientIn),
process_sasl_result(SASLResult, State).
-spec process_sasl_result(xmpp_sasl: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([xmpp_sasl:sasl_property()], binary(), state()) -> state().
process_sasl_success(Props, ServerOut,
#{socket := Socket,
sasl_mech := Mech} = State) ->
User = identity(Props),
AuthModule = proplists:get_value(auth_module, Props),
Socket1 = xmpp_socket:reset_stream(Socket),
State0 = State#{socket => Socket1},
State1 = try callback(handle_auth_success, User, Mech, AuthModule, State0)
catch _:{?MODULE, undef} -> State
end,
case is_disconnected(State1) of
true -> State1;
false ->
State2 = send_pkt(State1, #sasl_success{text = ServerOut}),
case is_disconnected(State2) of
true -> State2;
false ->
State3 = maps:remove(sasl_state,
maps:remove(sasl_mech, State2)),
State3#{stream_id => xmpp_stream: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(), xmpp_sasl: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,
#{sasl_mech := Mech, lang := Lang} = State) ->
{Reason, Text} = format_sasl_error(Mech, Err),
State1 = try callback(handle_auth_failure, User, Mech, Text, State)
catch _:{?MODULE, undef} -> State
end,
case is_disconnected(State1) of
true -> State1;
false ->
State2 = send_pkt(State1,
#sasl_failure{reason = Reason,
text = xmpp:mk_text(Text, Lang)}),
case is_disconnected(State2) of
true -> State2;
false ->
State3 = maps:remove(sasl_state,
maps:remove(sasl_mech, State2)),
State3#{stream_state => wait_for_sasl_request}
end
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