diff options
Diffstat (limited to 'lib/ssl/src/tls_connection.erl')
| -rw-r--r-- | lib/ssl/src/tls_connection.erl | 132 |
1 files changed, 63 insertions, 69 deletions
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl index 87e7809817..0f986b5e21 100644 --- a/lib/ssl/src/tls_connection.erl +++ b/lib/ssl/src/tls_connection.erl @@ -46,7 +46,7 @@ -export([start_fsm/8, start_link/8, init/1, pids/1]). %% State transition handling --export([next_record/1, next_event/3, next_event/4, +-export([next_event/3, next_event/4, handle_common_event/4]). %% Handshake handling @@ -61,7 +61,7 @@ encode_alert/3, close/5, protocol_name/0]). %% Data handling --export([encode_data/3, passive_receive/2, next_record_if_active/1, +-export([encode_data/3, next_record/1, send/3, socket/5, setopts/3, getopts/3]). %% gen_statem state functions @@ -161,30 +161,30 @@ next_record(#state{protocol_buffers = {Alert, State} end; next_record(#state{protocol_buffers = #protocol_buffers{tls_packets = [], tls_cipher_texts = []}, - socket = Socket, + protocol_specific = #{active_n_toggle := true, active_n := N} = ProtocolSpec, + socket = Socket, close_tag = CloseTag, transport_cb = Transport} = State) -> - case tls_socket:setopts(Transport, Socket, [{active,once}]) of - ok -> - {no_record, State}; - _ -> - self() ! {CloseTag, Socket}, - {no_record, State} - end; + case tls_socket:setopts(Transport, Socket, [{active, N}]) of + ok -> + {no_record, State#state{protocol_specific = ProtocolSpec#{active_n_toggle => false}}}; + _ -> + self() ! {CloseTag, Socket}, + {no_record, State} + end; next_record(State) -> {no_record, State}. next_event(StateName, Record, State) -> next_event(StateName, Record, State, []). - -next_event(connection = StateName, no_record, State0, Actions) -> - case next_record_if_active(State0) of - {no_record, State} -> - ssl_connection:hibernate_after(StateName, State, Actions); - {#ssl_tls{} = Record, State} -> - {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]}; - {#alert{} = Alert, State} -> - {next_state, StateName, State, [{next_event, internal, Alert} | Actions]} +next_event(StateName, no_record, State0, Actions) -> + case next_record(State0) of + {no_record, State} -> + {next_state, StateName, State, Actions}; + {#ssl_tls{} = Record, State} -> + {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]}; + {#alert{} = Alert, State} -> + {next_state, StateName, State, [{next_event, internal, Alert} | Actions]} end; next_event(StateName, Record, State, Actions) -> case Record of @@ -207,22 +207,21 @@ handle_common_event(internal, #ssl_tls{type = ?HANDSHAKE, fragment = Data}, ssl_options = Options} = State0) -> try {Packets, Buf} = tls_handshake:get_tls_handshake(Version,Data,Buf0, Options), - State1 = + State = State0#state{protocol_buffers = Buffers#protocol_buffers{tls_handshake_buffer = Buf}}, case Packets of [] -> assert_buffer_sanity(Buf, Options), - {Record, State} = next_record(State1), - next_event(StateName, Record, State); + next_event(StateName, no_record, State); _ -> Events = tls_handshake_events(Packets), case StateName of connection -> - ssl_connection:hibernate_after(StateName, State1, Events); + ssl_connection:hibernate_after(StateName, State, Events); _ -> {next_state, StateName, - State1#state{unprocessed_handshake_events = unprocessed_events(Events)}, Events} + State#state{unprocessed_handshake_events = unprocessed_events(Events)}, Events} end end catch throw:#alert{} = Alert -> @@ -277,11 +276,10 @@ renegotiate(#state{role = server, {BinMsg, ConnectionStates} = tls_record:encode_handshake(Frag, Version, ConnectionStates0), send(Transport, Socket, BinMsg), - State1 = State0#state{connection_states = + State = State0#state{connection_states = ConnectionStates, tls_handshake_history = Hs0}, - {Record, State} = next_record(State1), - next_event(hello, Record, State, Actions). + next_event(hello, no_record, State, Actions). send_handshake(Handshake, State) -> send_handshake_flight(queue_handshake(Handshake, State)). @@ -409,23 +407,6 @@ protocol_name() -> encode_data(Data, Version, ConnectionStates0)-> tls_record:encode_data(Data, Version, ConnectionStates0). -passive_receive(State0 = #state{user_data_buffer = Buffer}, StateName) -> - case Buffer of - <<>> -> - {Record, State} = next_record(State0), - next_event(StateName, Record, State); - _ -> - {Record, State} = ssl_connection:read_application_data(<<>>, State0), - next_event(StateName, Record, State) - end. - -next_record_if_active(State = - #state{socket_options = - #socket_options{active = false}}) -> - {no_record ,State}; -next_record_if_active(State) -> - next_record(State). - send(Transport, Socket, Data) -> tls_socket:send(Transport, Socket, Data). @@ -467,15 +448,14 @@ init({call, From}, {start, Timeout}, {BinMsg, ConnectionStates, Handshake} = encode_handshake(Hello, HelloVersion, ConnectionStates0, Handshake0), send(Transport, Socket, BinMsg), - State1 = State0#state{connection_states = ConnectionStates, - negotiated_version = Version, %% Requested version - session = - Session0#session{session_id = Hello#client_hello.session_id}, - tls_handshake_history = Handshake, - start_or_recv_from = From, + State = State0#state{connection_states = ConnectionStates, + negotiated_version = Version, %% Requested version + session = + Session0#session{session_id = Hello#client_hello.session_id}, + tls_handshake_history = Handshake, + start_or_recv_from = From, timer = Timer}, - {Record, State} = next_record(State1), - next_event(hello, Record, State); + next_event(hello, no_record, State); init(Type, Event, State) -> gen_handshake(?FUNCTION_NAME, Type, Event, State). @@ -610,36 +590,33 @@ connection(internal, #hello_request{}, connection_states = ConnectionStates} = State0) -> Hello = tls_handshake:client_hello(Host, Port, ConnectionStates, SslOpts, Cache, CacheCb, Renegotiation, Cert), - {State1, Actions} = send_handshake(Hello, State0), - {Record, State} = - next_record( - State1#state{session = Session0#session{session_id - = Hello#client_hello.session_id}}), - next_event(hello, Record, State, Actions); + {State, Actions} = send_handshake(Hello, State0), + next_event(hello, no_record, State#state{session = Session0#session{session_id + = Hello#client_hello.session_id}}, Actions); connection(internal, #client_hello{} = Hello, #state{role = server, allow_renegotiate = true, connection_states = CS, %%protocol_cb = Connection, protocol_specific = #{sender := Sender} - } = State0) -> + } = State) -> %% Mitigate Computational DoS attack %% http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html %% http://www.thc.org/thc-ssl-dos/ Rather than disabling client %% initiated renegotiation we will disallow many client initiated %% renegotiations immediately after each other. erlang:send_after(?WAIT_TO_ALLOW_RENEGOTIATION, self(), allow_renegotiate), - {Record, State} = next_record(State0#state{allow_renegotiate = false, - renegotiation = {true, peer}}), {ok, Write} = tls_sender:renegotiate(Sender), - next_event(hello, Record, State#state{connection_states = CS#{current_write => Write}}, + next_event(hello, no_record, State#state{connection_states = CS#{current_write => Write}, + allow_renegotiate = false, + renegotiation = {true, peer} + }, [{next_event, internal, Hello}]); connection(internal, #client_hello{}, #state{role = server, allow_renegotiate = false, protocol_cb = Connection} = State0) -> Alert = ?ALERT_REC(?WARNING, ?NO_RENEGOTIATION), send_alert_in_connection(Alert, State0), - State1 = Connection:reinit_handshake_data(State0), - {Record, State} = next_record(State1), - next_event(?FUNCTION_NAME, Record, State); + State = Connection:reinit_handshake_data(State0), + next_event(?FUNCTION_NAME, no_record, State); connection(Type, Event, State) -> ssl_connection:?FUNCTION_NAME(Type, Event, State, ?MODULE). @@ -688,6 +665,13 @@ initial_state(Role, Sender, Host, Port, Socket, {SSLOptions, SocketOptions, Trac _ -> ssl_session_cache end, + + InternalActiveN = case application:get_env(ssl, internal_active_n) of + {ok, N} when is_integer(N) andalso (not IsErlDist) -> + N; + _ -> + ?INTERNAL_ACTIVE_N + end, UserMonitor = erlang:monitor(process, User), @@ -714,7 +698,10 @@ initial_state(Role, Sender, Host, Port, Socket, {SSLOptions, SocketOptions, Trac protocol_cb = ?MODULE, tracker = Tracker, flight_buffer = [], - protocol_specific = #{sender => Sender} + protocol_specific = #{sender => Sender, + active_n => InternalActiveN, + active_n_toggle => true + } }. erl_dist_data(true) -> @@ -775,7 +762,8 @@ tls_handshake_events(Packets) -> %% raw data from socket, upack records handle_info({Protocol, _, Data}, StateName, - #state{data_tag = Protocol} = State0) -> + #state{data_tag = Protocol + } = State0) -> case next_tls_record(Data, StateName, State0) of {Record, State} -> next_event(StateName, Record, State); @@ -783,11 +771,16 @@ handle_info({Protocol, _, Data}, StateName, ssl_connection:handle_normal_shutdown(Alert, StateName, State0), ssl_connection:stop({shutdown, own_alert}, State0) end; +handle_info({tcp_passive, Socket}, StateName, #state{socket = Socket, + protocol_specific = PS + } = State) -> + next_event(StateName, no_record, State#state{protocol_specific = PS#{active_n_toggle => true}}); handle_info({CloseTag, Socket}, StateName, #state{socket = Socket, close_tag = CloseTag, socket_options = #socket_options{active = Active}, protocol_buffers = #protocol_buffers{tls_cipher_texts = CTs}, user_data_buffer = Buffer, + protocol_specific = PS, negotiated_version = Version} = State) -> %% Note that as of TLS 1.1, @@ -813,8 +806,9 @@ handle_info({CloseTag, Socket}, StateName, true -> %% Fixes non-delivery of final TLS record in {active, once}. %% Basically allows the application the opportunity to set {active, once} again - %% and then receive the final message. - next_event(StateName, no_record, State) + %% and then receive the final message. Set internal active_n to zero + %% to ensure socket close message is sent if there is not enough data to deliver. + next_event(StateName, no_record, State#state{protocol_specific = PS#{active_n_toggle => true}}) end; handle_info({'EXIT', Sender, Reason}, _, #state{protocol_specific = #{sender := Sender}} = State) -> |