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Diffstat (limited to 'lib/ssl/src/tls_sender.erl')
-rw-r--r-- | lib/ssl/src/tls_sender.erl | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/lib/ssl/src/tls_sender.erl b/lib/ssl/src/tls_sender.erl new file mode 100644 index 0000000000..d0604565e3 --- /dev/null +++ b/lib/ssl/src/tls_sender.erl @@ -0,0 +1,524 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2018-2019. 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. +%% +%% %CopyrightEnd% +%% + +-module(tls_sender). + +-behaviour(gen_statem). + +-include("ssl_internal.hrl"). +-include("ssl_alert.hrl"). +-include("ssl_handshake.hrl"). +-include("ssl_api.hrl"). + +%% API +-export([start/0, start/1, initialize/2, send_data/2, send_alert/2, + send_and_ack_alert/2, setopts/2, renegotiate/1, peer_renegotiate/1, downgrade/2, + update_connection_state/3, dist_tls_socket/1, dist_handshake_complete/3]). + +%% gen_statem callbacks +-export([callback_mode/0, init/1, terminate/3, code_change/4]). +-export([init/3, connection/3, handshake/3, death_row/3]). + +-define(SERVER, ?MODULE). + +-record(static, + {connection_pid, + role, + socket, + socket_options, + tracker, + transport_cb, + negotiated_version, + renegotiate_at, + connection_monitor, + dist_handle, + log_level + }). + +-record(data, + {static = #static{}, + connection_states = #{} + }). + +%%%=================================================================== +%%% API +%%%=================================================================== +%%-------------------------------------------------------------------- +-spec start() -> {ok, Pid :: pid()} | + ignore | + {error, Error :: term()}. +-spec start(list()) -> {ok, Pid :: pid()} | + ignore | + {error, Error :: term()}. + +%% Description: Start sender process to avoid dead lock that +%% may happen when a socket is busy (busy port) and the +%% same process is sending and receiving +%%-------------------------------------------------------------------- +start() -> + gen_statem:start(?MODULE, [], []). +start(SpawnOpts) -> + gen_statem:start(?MODULE, [], SpawnOpts). + +%%-------------------------------------------------------------------- +-spec initialize(pid(), map()) -> ok. +%% Description: So TLS connection process can initialize it sender +%% process. +%%-------------------------------------------------------------------- +initialize(Pid, InitMsg) -> + gen_statem:call(Pid, {self(), InitMsg}). + +%%-------------------------------------------------------------------- +-spec send_data(pid(), iodata()) -> ok | {error, term()}. +%% Description: Send application data +%%-------------------------------------------------------------------- +send_data(Pid, AppData) -> + %% Needs error handling for external API + call(Pid, {application_data, AppData}). + +%%-------------------------------------------------------------------- +-spec send_alert(pid(), #alert{}) -> _. +%% Description: TLS connection process wants to send an Alert +%% in the connection state. +%%-------------------------------------------------------------------- +send_alert(Pid, Alert) -> + gen_statem:cast(Pid, Alert). + +%%-------------------------------------------------------------------- +-spec send_and_ack_alert(pid(), #alert{}) -> _. +%% Description: TLS connection process wants to send an Alert +%% in the connection state and recive an ack. +%%-------------------------------------------------------------------- +send_and_ack_alert(Pid, Alert) -> + gen_statem:call(Pid, {ack_alert, Alert}, ?DEFAULT_TIMEOUT). +%%-------------------------------------------------------------------- +-spec setopts(pid(), [{packet, integer() | atom()}]) -> ok | {error, term()}. +%% Description: Send application data +%%-------------------------------------------------------------------- +setopts(Pid, Opts) -> + call(Pid, {set_opts, Opts}). + +%%-------------------------------------------------------------------- +-spec renegotiate(pid()) -> {ok, WriteState::map()} | {error, closed}. +%% Description: So TLS connection process can synchronize the +%% encryption state to be used when handshaking. +%%-------------------------------------------------------------------- +renegotiate(Pid) -> + %% Needs error handling for external API + call(Pid, renegotiate). + +%%-------------------------------------------------------------------- +-spec peer_renegotiate(pid()) -> {ok, WriteState::map()} | {error, term()}. +%% Description: So TLS connection process can synchronize the +%% encryption state to be used when handshaking. +%%-------------------------------------------------------------------- +peer_renegotiate(Pid) -> + gen_statem:call(Pid, renegotiate, ?DEFAULT_TIMEOUT). + +%%-------------------------------------------------------------------- +-spec update_connection_state(pid(), WriteState::map(), tls_record:tls_version()) -> ok. +%% Description: So TLS connection process can synchronize the +%% encryption state to be used when sending application data. +%%-------------------------------------------------------------------- +update_connection_state(Pid, NewState, Version) -> + gen_statem:cast(Pid, {new_write, NewState, Version}). + +%%-------------------------------------------------------------------- +-spec downgrade(pid(), integer()) -> {ok, ssl_record:connection_state()} + | {error, timeout}. +%% Description: So TLS connection process can synchronize the +%% encryption state to be used when sending application data. +%%-------------------------------------------------------------------- +downgrade(Pid, Timeout) -> + try gen_statem:call(Pid, downgrade, Timeout) of + Result -> + Result + catch + _:_ -> + {error, timeout} + end. +%%-------------------------------------------------------------------- +-spec dist_handshake_complete(pid(), node(), term()) -> ok. +%% Description: Erlang distribution callback +%%-------------------------------------------------------------------- +dist_handshake_complete(ConnectionPid, Node, DHandle) -> + gen_statem:call(ConnectionPid, {dist_handshake_complete, Node, DHandle}). +%%-------------------------------------------------------------------- +-spec dist_tls_socket(pid()) -> {ok, #sslsocket{}}. +%% Description: To enable distribution startup to get a proper "#sslsocket{}" +%%-------------------------------------------------------------------- +dist_tls_socket(Pid) -> + gen_statem:call(Pid, dist_get_tls_socket). + +%%%=================================================================== +%%% gen_statem callbacks +%%%=================================================================== +%%-------------------------------------------------------------------- +-spec callback_mode() -> gen_statem:callback_mode_result(). +%%-------------------------------------------------------------------- +callback_mode() -> + state_functions. + + +-define(HANDLE_COMMON, + ?FUNCTION_NAME(Type, Msg, StateData) -> + handle_common(Type, Msg, StateData)). +%%-------------------------------------------------------------------- +-spec init(Args :: term()) -> + gen_statem:init_result(atom()). +%%-------------------------------------------------------------------- +init(_) -> + %% Note: Should not trap exits so that this process + %% will be terminated if tls_connection process is + %% killed brutally + {ok, init, #data{}}. + +%%-------------------------------------------------------------------- +-spec init(gen_statem:event_type(), + Msg :: term(), + StateData :: term()) -> + gen_statem:event_handler_result(atom()). +%%-------------------------------------------------------------------- +init({call, From}, {Pid, #{current_write := WriteState, + role := Role, + socket := Socket, + socket_options := SockOpts, + tracker := Tracker, + transport_cb := Transport, + negotiated_version := Version, + renegotiate_at := RenegotiateAt, + log_level := LogLevel}}, + #data{connection_states = ConnectionStates, static = Static0} = StateData0) -> + Monitor = erlang:monitor(process, Pid), + StateData = + StateData0#data{connection_states = ConnectionStates#{current_write => WriteState}, + static = Static0#static{connection_pid = Pid, + connection_monitor = Monitor, + role = Role, + socket = Socket, + socket_options = SockOpts, + tracker = Tracker, + transport_cb = Transport, + negotiated_version = Version, + renegotiate_at = RenegotiateAt, + log_level = LogLevel}}, + {next_state, handshake, StateData, [{reply, From, ok}]}; +init(_, _, _) -> + %% Just in case anything else sneeks through + {keep_state_and_data, [postpone]}. + +%%-------------------------------------------------------------------- +-spec connection(gen_statem:event_type(), + Msg :: term(), + StateData :: term()) -> + gen_statem:event_handler_result(atom()). +%%-------------------------------------------------------------------- +connection({call, From}, {application_data, AppData}, + #data{static = #static{socket_options = #socket_options{packet = Packet}}} = + StateData) -> + case encode_packet(Packet, AppData) of + {error, _} = Error -> + {next_state, ?FUNCTION_NAME, StateData, [{reply, From, Error}]}; + Data -> + send_application_data(Data, From, ?FUNCTION_NAME, StateData) + end; +connection({call, From}, {ack_alert, #alert{} = Alert}, StateData0) -> + StateData = send_tls_alert(Alert, StateData0), + {next_state, ?FUNCTION_NAME, StateData, + [{reply,From,ok}]}; +connection({call, From}, renegotiate, + #data{connection_states = #{current_write := Write}} = StateData) -> + {next_state, handshake, StateData, [{reply, From, {ok, Write}}]}; +connection({call, From}, downgrade, #data{connection_states = + #{current_write := Write}} = StateData) -> + {next_state, death_row, StateData, [{reply,From, {ok, Write}}]}; +connection({call, From}, {set_opts, Opts}, StateData) -> + handle_set_opts(From, Opts, StateData); +connection({call, From}, dist_get_tls_socket, + #data{static = #static{transport_cb = Transport, + socket = Socket, + connection_pid = Pid, + tracker = Tracker}} = StateData) -> + TLSSocket = tls_connection:socket([Pid, self()], Transport, Socket, Tracker), + {next_state, ?FUNCTION_NAME, StateData, [{reply, From, {ok, TLSSocket}}]}; +connection({call, From}, {dist_handshake_complete, _Node, DHandle}, + #data{static = #static{connection_pid = Pid} = Static} = StateData) -> + ok = erlang:dist_ctrl_input_handler(DHandle, Pid), + ok = ssl_connection:dist_handshake_complete(Pid, DHandle), + %% From now on we execute on normal priority + process_flag(priority, normal), + {keep_state, StateData#data{static = Static#static{dist_handle = DHandle}}, + [{reply,From,ok}| + case dist_data(DHandle) of + [] -> + []; + Data -> + [{next_event, internal, + {application_packets,{self(),undefined},erlang:iolist_to_iovec(Data)}}] + end]}; +connection(internal, {application_packets, From, Data}, StateData) -> + send_application_data(Data, From, ?FUNCTION_NAME, StateData); +%% +connection(cast, #alert{} = Alert, StateData0) -> + StateData = send_tls_alert(Alert, StateData0), + {next_state, ?FUNCTION_NAME, StateData}; +connection(cast, {new_write, WritesState, Version}, + #data{connection_states = ConnectionStates, static = Static} = StateData) -> + {next_state, connection, + StateData#data{connection_states = + ConnectionStates#{current_write => WritesState}, + static = Static#static{negotiated_version = Version}}}; +%% +connection(info, dist_data, #data{static = #static{dist_handle = DHandle}}) -> + {keep_state_and_data, + case dist_data(DHandle) of + [] -> + []; + Data -> + [{next_event, internal, + {application_packets,{self(),undefined},erlang:iolist_to_iovec(Data)}}] + end}; +connection(info, tick, StateData) -> + consume_ticks(), + Data = [<<0:32>>], % encode_packet(4, <<>>) + From = {self(), undefined}, + send_application_data(Data, From, ?FUNCTION_NAME, StateData); +connection(info, {send, From, Ref, Data}, _StateData) -> + %% This is for testing only! + %% + %% Needed by some OTP distribution + %% test suites... + From ! {Ref, ok}, + {keep_state_and_data, + [{next_event, {call, {self(), undefined}}, + {application_data, erlang:iolist_to_iovec(Data)}}]}; +?HANDLE_COMMON. + +%%-------------------------------------------------------------------- +-spec handshake(gen_statem:event_type(), + Msg :: term(), + StateData :: term()) -> + gen_statem:event_handler_result(atom()). +%%-------------------------------------------------------------------- +handshake({call, From}, {set_opts, Opts}, StateData) -> + handle_set_opts(From, Opts, StateData); +handshake({call, _}, _, _) -> + %% Postpone all calls to the connection state + {keep_state_and_data, [postpone]}; +handshake(internal, {application_packets,_,_}, _) -> + {keep_state_and_data, [postpone]}; +handshake(cast, {new_write, WritesState, Version}, + #data{connection_states = ConnectionStates, static = Static} = StateData) -> + {next_state, connection, + StateData#data{connection_states = ConnectionStates#{current_write => WritesState}, + static = Static#static{negotiated_version = Version}}}; +handshake(info, dist_data, _) -> + {keep_state_and_data, [postpone]}; +handshake(info, tick, _) -> + %% Ignore - data is sent anyway during handshake + consume_ticks(), + keep_state_and_data; +handshake(info, {send, _, _, _}, _) -> + %% Testing only, OTP distribution test suites... + {keep_state_and_data, [postpone]}; +?HANDLE_COMMON. + +%%-------------------------------------------------------------------- +-spec death_row(gen_statem:event_type(), + Msg :: term(), + StateData :: term()) -> + gen_statem:event_handler_result(atom()). +%%-------------------------------------------------------------------- +death_row(state_timeout, Reason, _State) -> + {stop, {shutdown, Reason}}; +death_row(_Type, _Msg, _State) -> + %% Waste all other events + keep_state_and_data. + +%%-------------------------------------------------------------------- +-spec terminate(Reason :: term(), State :: term(), Data :: term()) -> + any(). +%%-------------------------------------------------------------------- +terminate(_Reason, _State, _Data) -> + void. + +%%-------------------------------------------------------------------- +-spec code_change( + OldVsn :: term() | {down,term()}, + State :: term(), Data :: term(), Extra :: term()) -> + {ok, NewState :: term(), NewData :: term()} | + (Reason :: term()). +%% Convert process state when code is changed +%%-------------------------------------------------------------------- +code_change(_OldVsn, State, Data, _Extra) -> + {ok, State, Data}. + +%%%=================================================================== +%%% Internal functions +%%%=================================================================== + +handle_set_opts( + From, Opts, #data{static = #static{socket_options = SockOpts} = Static} = StateData) -> + {keep_state, StateData#data{static = Static#static{socket_options = set_opts(SockOpts, Opts)}}, + [{reply, From, ok}]}. + +handle_common( + {call, From}, {set_opts, Opts}, + #data{static = #static{socket_options = SockOpts} = Static} = StateData) -> + {keep_state, StateData#data{static = Static#static{socket_options = set_opts(SockOpts, Opts)}}, + [{reply, From, ok}]}; +handle_common( + info, {'DOWN', Monitor, _, _, Reason}, + #data{static = #static{connection_monitor = Monitor, + dist_handle = Handle}} = StateData) when Handle =/= undefined -> + {next_state, death_row, StateData, + [{state_timeout, 5000, Reason}]}; +handle_common( + info, {'DOWN', Monitor, _, _, _}, + #data{static = #static{connection_monitor = Monitor}} = StateData) -> + {stop, normal, StateData}; +handle_common(info, Msg, _) -> + Report = + io_lib:format("TLS sender: Got unexpected info: ~p ~n", [Msg]), + error_logger:info_report(Report), + keep_state_and_data; +handle_common(Type, Msg, _) -> + Report = + io_lib:format( + "TLS sender: Got unexpected event: ~p ~n", [{Type,Msg}]), + error_logger:error_report(Report), + keep_state_and_data. + +send_tls_alert(#alert{} = Alert, + #data{static = #static{negotiated_version = Version, + socket = Socket, + transport_cb = Transport, + log_level = LogLevel}, + connection_states = ConnectionStates0} = StateData0) -> + {BinMsg, ConnectionStates} = + tls_record:encode_alert_record(Alert, Version, ConnectionStates0), + tls_socket:send(Transport, Socket, BinMsg), + ssl_logger:debug(LogLevel, outbound, 'record', BinMsg), + StateData0#data{connection_states = ConnectionStates}. + +send_application_data(Data, From, StateName, + #data{static = #static{connection_pid = Pid, + socket = Socket, + dist_handle = DistHandle, + negotiated_version = Version, + transport_cb = Transport, + renegotiate_at = RenegotiateAt, + log_level = LogLevel}, + connection_states = ConnectionStates0} = StateData0) -> + case time_to_renegotiate(Data, ConnectionStates0, RenegotiateAt) of + true -> + ssl_connection:internal_renegotiation(Pid, ConnectionStates0), + {next_state, handshake, StateData0, + [{next_event, internal, {application_packets, From, Data}}]}; + false -> + {Msgs, ConnectionStates} = tls_record:encode_data(Data, Version, ConnectionStates0), + StateData = StateData0#data{connection_states = ConnectionStates}, + case tls_socket:send(Transport, Socket, Msgs) of + ok when DistHandle =/= undefined -> + ssl_logger:debug(LogLevel, outbound, 'record', Msgs), + {next_state, StateName, StateData, []}; + Reason when DistHandle =/= undefined -> + {next_state, death_row, StateData, [{state_timeout, 5000, Reason}]}; + ok -> + ssl_logger:debug(LogLevel, outbound, 'record', Msgs), + {next_state, StateName, StateData, [{reply, From, ok}]}; + Result -> + {next_state, StateName, StateData, [{reply, From, Result}]} + end + end. + +-compile({inline, encode_packet/2}). +encode_packet(Packet, Data) -> + Len = iolist_size(Data), + case Packet of + 1 when Len < (1 bsl 8) -> [<<Len:8>>|Data]; + 2 when Len < (1 bsl 16) -> [<<Len:16>>|Data]; + 4 when Len < (1 bsl 32) -> [<<Len:32>>|Data]; + N when N =:= 1; N =:= 2; N =:= 4 -> + {error, + {badarg, {packet_to_large, Len, (1 bsl (Packet bsl 3)) - 1}}}; + _ -> + Data + end. + +set_opts(SocketOptions, [{packet, N}]) -> + SocketOptions#socket_options{packet = N}. + +time_to_renegotiate(_Data, + #{current_write := #{sequence_number := Num}}, + RenegotiateAt) -> + + %% We could do test: + %% is_time_to_renegotiate((erlang:byte_size(_Data) div + %% ?MAX_PLAIN_TEXT_LENGTH) + 1, RenegotiateAt), but we chose to + %% have a some what lower renegotiateAt and a much cheaper test + is_time_to_renegotiate(Num, RenegotiateAt). + +is_time_to_renegotiate(N, M) when N < M-> + false; +is_time_to_renegotiate(_,_) -> + true. + +call(FsmPid, Event) -> + try gen_statem:call(FsmPid, Event) + catch + exit:{noproc, _} -> + {error, closed}; + exit:{normal, _} -> + {error, closed}; + exit:{{shutdown, _},_} -> + {error, closed} + end. + +%%-------------- Erlang distribution helpers ------------------------------ + +dist_data(DHandle) -> + case erlang:dist_ctrl_get_data(DHandle) of + none -> + erlang:dist_ctrl_get_data_notification(DHandle), + []; + %% This is encode_packet(4, Data) without Len check + %% since the emulator will always deliver a Data + %% smaller than 4 GB, and the distribution will + %% therefore always have to use {packet,4} + Data when is_binary(Data) -> + Len = byte_size(Data), + [[<<Len:32>>,Data]|dist_data(DHandle)]; + [BA,BB] = Data -> + Len = byte_size(BA) + byte_size(BB), + [[<<Len:32>>|Data]|dist_data(DHandle)]; + Data when is_list(Data) -> + Len = iolist_size(Data), + [[<<Len:32>>|Data]|dist_data(DHandle)] + end. + + +%% Empty the inbox from distribution ticks - do not let them accumulate +consume_ticks() -> + receive tick -> + consume_ticks() + after 0 -> + ok + end. |