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authorIngela Anderton Andin <[email protected]>2017-11-16 09:47:11 +0100
committerIngela Anderton Andin <[email protected]>2017-11-16 09:47:11 +0100
commit70defe957f68f5ad4a4957af29c8713556074995 (patch)
treef859c979f2f32015bdb56144fcac8720996da325 /lib/ssl/src/tls_connection.erl
parent8c7b86083be0f86f62918b73117121617624ec48 (diff)
parentd23177bc6b609ea69a1caac6f04d9dbffc5c526c (diff)
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Merge branch 'ingela/ssl/code-enhance' into maint
* ingela/ssl/code-enhance: ssl: Align code of TLS/DTLS handshake handling ssl: Align code of TLS/DTLS record handling ssl: Align code of main modules implementing the gen_statem behaviour dtls: Add state spec
Diffstat (limited to 'lib/ssl/src/tls_connection.erl')
-rw-r--r--lib/ssl/src/tls_connection.erl601
1 files changed, 298 insertions, 303 deletions
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl
index ccda58e0a9..23ba2ed7dc 100644
--- a/lib/ssl/src/tls_connection.erl
+++ b/lib/ssl/src/tls_connection.erl
@@ -45,10 +45,8 @@
%% Setup
-export([start_fsm/8, start_link/7, init/1]).
--export([encode_data/3, encode_alert/3]).
-
%% State transition handling
--export([next_record/1, next_event/3, next_event/4]).
+-export([next_record/1, next_event/3, next_event/4, handle_common_event/4]).
%% Handshake handling
-export([renegotiate/2, send_handshake/2,
@@ -56,11 +54,11 @@
reinit_handshake_data/1, select_sni_extension/1, empty_connection_state/2]).
%% Alert and close handling
--export([send_alert/2, close/5, protocol_name/0]).
+-export([encode_alert/3, send_alert/2, close/5, protocol_name/0]).
%% Data handling
--export([passive_receive/2, next_record_if_active/1, handle_common_event/4, send/3,
- socket/5, setopts/3, getopts/3]).
+-export([encode_data/3, passive_receive/2, next_record_if_active/1, send/3,
+ socket/5, setopts/3, getopts/3]).
%% gen_statem state functions
-export([init/3, error/3, downgrade/3, %% Initiation and take down states
@@ -72,6 +70,9 @@
%%====================================================================
%% Internal application API
%%====================================================================
+%%====================================================================
+%% Setup
+%%====================================================================
start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_, Tracker} = Opts,
User, {CbModule, _,_, _} = CbInfo,
Timeout) ->
@@ -100,6 +101,168 @@ start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_, Tracker} =
Error
end.
+%%--------------------------------------------------------------------
+-spec start_link(atom(), host(), inet:port_number(), port(), list(), pid(), tuple()) ->
+ {ok, pid()} | ignore | {error, reason()}.
+%%
+%% Description: Creates a gen_statem process which calls Module:init/1 to
+%% initialize.
+%%--------------------------------------------------------------------
+start_link(Role, Host, Port, Socket, Options, User, CbInfo) ->
+ {ok, proc_lib:spawn_link(?MODULE, init, [[Role, Host, Port, Socket, Options, User, CbInfo]])}.
+
+init([Role, Host, Port, Socket, Options, User, CbInfo]) ->
+ process_flag(trap_exit, true),
+ State0 = initial_state(Role, Host, Port, Socket, Options, User, CbInfo),
+ try
+ State = ssl_connection:ssl_config(State0#state.ssl_options, Role, State0),
+ gen_statem:enter_loop(?MODULE, [], init, State)
+ catch throw:Error ->
+ gen_statem:enter_loop(?MODULE, [], error, {Error, State0})
+ end.
+%%====================================================================
+%% State transition handling
+%%====================================================================
+next_record(#state{unprocessed_handshake_events = N} = State) when N > 0 ->
+ {no_record, State#state{unprocessed_handshake_events = N-1}};
+
+next_record(#state{protocol_buffers =
+ #protocol_buffers{tls_packets = [], tls_cipher_texts = [CT | Rest]}
+ = Buffers,
+ connection_states = ConnStates0,
+ ssl_options = #ssl_options{padding_check = Check}} = State) ->
+ case tls_record:decode_cipher_text(CT, ConnStates0, Check) of
+ {Plain, ConnStates} ->
+ {Plain, State#state{protocol_buffers =
+ Buffers#protocol_buffers{tls_cipher_texts = Rest},
+ connection_states = ConnStates}};
+ #alert{} = Alert ->
+ {Alert, State}
+ end;
+next_record(#state{protocol_buffers = #protocol_buffers{tls_packets = [], tls_cipher_texts = []},
+ socket = Socket,
+ transport_cb = Transport} = State) ->
+ case tls_socket:setopts(Transport, Socket, [{active,once}]) of
+ ok ->
+ {no_record, State};
+ _ ->
+ {socket_closed, State}
+ end;
+next_record(State) ->
+ {no_record, State}.
+
+next_event(StateName, Record, State) ->
+ next_event(StateName, Record, State, []).
+
+next_event(StateName, socket_closed, State, _) ->
+ ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
+ {stop, {shutdown, transport_closed}, 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);
+ {socket_closed, State} ->
+ next_event(StateName, socket_closed, 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
+ no_record ->
+ {next_state, StateName, State, Actions};
+ #ssl_tls{} = Record ->
+ {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]};
+ #alert{} = Alert ->
+ {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
+ end.
+
+handle_common_event(internal, #alert{} = Alert, StateName,
+ #state{negotiated_version = Version} = State) ->
+ ssl_connection:handle_own_alert(Alert, Version, StateName, State);
+%%% TLS record protocol level handshake messages
+handle_common_event(internal, #ssl_tls{type = ?HANDSHAKE, fragment = Data},
+ StateName, #state{protocol_buffers =
+ #protocol_buffers{tls_handshake_buffer = Buf0} = Buffers,
+ negotiated_version = Version,
+ ssl_options = Options} = State0) ->
+ try
+ {Packets, Buf} = tls_handshake:get_tls_handshake(Version,Data,Buf0, Options),
+ State1 =
+ 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);
+ _ ->
+ Events = tls_handshake_events(Packets),
+ case StateName of
+ connection ->
+ ssl_connection:hibernate_after(StateName, State1, Events);
+ _ ->
+ {next_state, StateName,
+ State1#state{unprocessed_handshake_events = unprocessed_events(Events)}, Events}
+ end
+ end
+ catch throw:#alert{} = Alert ->
+ ssl_connection:handle_own_alert(Alert, Version, StateName, State0)
+ end;
+%%% TLS record protocol level application data messages
+handle_common_event(internal, #ssl_tls{type = ?APPLICATION_DATA, fragment = Data}, StateName, State) ->
+ {next_state, StateName, State, [{next_event, internal, {application_data, Data}}]};
+%%% TLS record protocol level change cipher messages
+handle_common_event(internal, #ssl_tls{type = ?CHANGE_CIPHER_SPEC, fragment = Data}, StateName, State) ->
+ {next_state, StateName, State, [{next_event, internal, #change_cipher_spec{type = Data}}]};
+%%% TLS record protocol level Alert messages
+handle_common_event(internal, #ssl_tls{type = ?ALERT, fragment = EncAlerts}, StateName,
+ #state{negotiated_version = Version} = State) ->
+ try decode_alerts(EncAlerts) of
+ Alerts = [_|_] ->
+ handle_alerts(Alerts, {next_state, StateName, State});
+ [] ->
+ ssl_connection:handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, empty_alert),
+ Version, StateName, State);
+ #alert{} = Alert ->
+ ssl_connection:handle_own_alert(Alert, Version, StateName, State)
+ catch
+ _:_ ->
+ ssl_connection:handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, alert_decode_error),
+ Version, StateName, State)
+
+ end;
+%% Ignore unknown TLS record level protocol messages
+handle_common_event(internal, #ssl_tls{type = _Unknown}, StateName, State) ->
+ {next_state, StateName, State}.
+%%====================================================================
+%% Handshake handling
+%%====================================================================
+renegotiate(#state{role = client} = State, Actions) ->
+ %% Handle same way as if server requested
+ %% the renegotiation
+ Hs0 = ssl_handshake:init_handshake_history(),
+ {next_state, connection, State#state{tls_handshake_history = Hs0},
+ [{next_event, internal, #hello_request{}} | Actions]};
+
+renegotiate(#state{role = server,
+ socket = Socket,
+ transport_cb = Transport,
+ negotiated_version = Version,
+ connection_states = ConnectionStates0} = State0, Actions) ->
+ HelloRequest = ssl_handshake:hello_request(),
+ Frag = tls_handshake:encode_handshake(HelloRequest, Version),
+ Hs0 = ssl_handshake:init_handshake_history(),
+ {BinMsg, ConnectionStates} =
+ tls_record:encode_handshake(Frag, Version, ConnectionStates0),
+ send(Transport, Socket, BinMsg),
+ State1 = State0#state{connection_states =
+ ConnectionStates,
+ tls_handshake_history = Hs0},
+ {Record, State} = next_record(State1),
+ next_event(hello, Record, State, Actions).
+
send_handshake(Handshake, State) ->
send_handshake_flight(queue_handshake(Handshake, State)).
@@ -128,15 +291,6 @@ queue_change_cipher(Msg, #state{negotiated_version = Version,
State0#state{connection_states = ConnectionStates,
flight_buffer = Flight0 ++ [BinChangeCipher]}.
-send_alert(Alert, #state{negotiated_version = Version,
- socket = Socket,
- transport_cb = Transport,
- connection_states = ConnectionStates0} = State0) ->
- {BinMsg, ConnectionStates} =
- encode_alert(Alert, Version, ConnectionStates0),
- send(Transport, Socket, BinMsg),
- State0#state{connection_states = ConnectionStates}.
-
reinit_handshake_data(State) ->
%% premaster_secret, public_key_info and tls_handshake_info
%% are only needed during the handshake phase.
@@ -155,8 +309,17 @@ select_sni_extension(_) ->
empty_connection_state(ConnectionEnd, BeastMitigation) ->
ssl_record:empty_connection_state(ConnectionEnd, BeastMitigation).
-encode_data(Data, Version, ConnectionStates0)->
- tls_record:encode_data(Data, Version, ConnectionStates0).
+%%====================================================================
+%% Alert and close handling
+%%====================================================================
+send_alert(Alert, #state{negotiated_version = Version,
+ socket = Socket,
+ transport_cb = Transport,
+ connection_states = ConnectionStates0} = State0) ->
+ {BinMsg, ConnectionStates} =
+ encode_alert(Alert, Version, ConnectionStates0),
+ send(Transport, Socket, BinMsg),
+ State0#state{connection_states = ConnectionStates}.
%%--------------------------------------------------------------------
-spec encode_alert(#alert{}, ssl_record:ssl_version(), ssl_record:connection_states()) ->
@@ -166,42 +329,66 @@ encode_data(Data, Version, ConnectionStates0)->
%%--------------------------------------------------------------------
encode_alert(#alert{} = Alert, Version, ConnectionStates) ->
tls_record:encode_alert_record(Alert, Version, ConnectionStates).
-
+%% User closes or recursive call!
+close({close, Timeout}, Socket, Transport = gen_tcp, _,_) ->
+ tls_socket:setopts(Transport, Socket, [{active, false}]),
+ Transport:shutdown(Socket, write),
+ _ = Transport:recv(Socket, 0, Timeout),
+ ok;
+%% Peer closed socket
+close({shutdown, transport_closed}, Socket, Transport = gen_tcp, ConnectionStates, Check) ->
+ close({close, 0}, Socket, Transport, ConnectionStates, Check);
+%% We generate fatal alert
+close({shutdown, own_alert}, Socket, Transport = gen_tcp, ConnectionStates, Check) ->
+ %% Standard trick to try to make sure all
+ %% data sent to the tcp port is really delivered to the
+ %% peer application before tcp port is closed so that the peer will
+ %% get the correct TLS alert message and not only a transport close.
+ %% Will return when other side has closed or after timout millisec
+ %% e.g. we do not want to hang if something goes wrong
+ %% with the network but we want to maximise the odds that
+ %% peer application gets all data sent on the tcp connection.
+ close({close, ?DEFAULT_TIMEOUT}, Socket, Transport, ConnectionStates, Check);
+close(downgrade, _,_,_,_) ->
+ ok;
+%% Other
+close(_, Socket, Transport, _,_) ->
+ Transport:close(Socket).
protocol_name() ->
"TLS".
-%%====================================================================
-%% tls_connection_sup API
-%%====================================================================
-%%--------------------------------------------------------------------
--spec start_link(atom(), host(), inet:port_number(), port(), list(), pid(), tuple()) ->
- {ok, pid()} | ignore | {error, reason()}.
-%%
-%% Description: Creates a gen_fsm process which calls Module:init/1 to
-%% initialize. To ensure a synchronized start-up procedure, this function
-%% does not return until Module:init/1 has returned.
-%%--------------------------------------------------------------------
-start_link(Role, Host, Port, Socket, Options, User, CbInfo) ->
- {ok, proc_lib:spawn_link(?MODULE, init, [[Role, Host, Port, Socket, Options, User, CbInfo]])}.
+%%====================================================================
+%% Data handling
+%%====================================================================
+encode_data(Data, Version, ConnectionStates0)->
+ tls_record:encode_data(Data, Version, ConnectionStates0).
-init([Role, Host, Port, Socket, Options, User, CbInfo]) ->
- process_flag(trap_exit, true),
- State0 = initial_state(Role, Host, Port, Socket, Options, User, CbInfo),
- try
- State = ssl_connection:ssl_config(State0#state.ssl_options, Role, State0),
- gen_statem:enter_loop(?MODULE, [], init, State)
- catch throw:Error ->
- gen_statem:enter_loop(?MODULE, [], error, {Error, State0})
+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.
-callback_mode() ->
- state_functions.
+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).
socket(Pid, Transport, Socket, Connection, Tracker) ->
tls_socket:socket(Pid, Transport, Socket, Connection, Tracker).
setopts(Transport, Socket, Other) ->
tls_socket:setopts(Transport, Socket, Other).
+
getopts(Transport, Socket, Tag) ->
tls_socket:getopts(Transport, Socket, Tag).
@@ -387,134 +574,18 @@ connection(Type, Event, State) ->
downgrade(Type, Event, State) ->
ssl_connection:?FUNCTION_NAME(Type, Event, State, ?MODULE).
-%%--------------------------------------------------------------------
-%% Event handling functions called by state functions to handle
-%% common or unexpected events for the state.
-%%--------------------------------------------------------------------
-handle_call(Event, From, StateName, State) ->
- ssl_connection:handle_call(Event, From, StateName, State, ?MODULE).
-
-%% raw data from socket, unpack records
-handle_info({Protocol, _, Data}, StateName,
- #state{data_tag = Protocol} = State0) ->
- case next_tls_record(Data, State0) of
- {Record, State} ->
- next_event(StateName, Record, State);
- #alert{} = Alert ->
- ssl_connection:handle_normal_shutdown(Alert, StateName, State0),
- {stop, {shutdown, own_alert}}
- end;
-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},
- negotiated_version = Version} = State) ->
-
- %% Note that as of TLS 1.1,
- %% failure to properly close a connection no longer requires that a
- %% session not be resumed. This is a change from TLS 1.0 to conform
- %% with widespread implementation practice.
-
- case (Active == false) andalso (CTs =/= []) of
- false ->
- case Version of
- {1, N} when N >= 1 ->
- ok;
- _ ->
- %% As invalidate_sessions here causes performance issues,
- %% we will conform to the widespread implementation
- %% practice and go aginst the spec
- %%invalidate_session(Role, Host, Port, Session)
- ok
- end,
-
- ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
- {stop, {shutdown, transport_closed}};
- 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)
- end;
-handle_info(Msg, StateName, State) ->
- ssl_connection:handle_info(Msg, StateName, State).
-
-handle_common_event(internal, #alert{} = Alert, StateName,
- #state{negotiated_version = Version} = State) ->
- ssl_connection:handle_own_alert(Alert, Version, StateName, State);
-
-%%% TLS record protocol level handshake messages
-handle_common_event(internal, #ssl_tls{type = ?HANDSHAKE, fragment = Data},
- StateName, #state{protocol_buffers =
- #protocol_buffers{tls_handshake_buffer = Buf0} = Buffers,
- negotiated_version = Version,
- ssl_options = Options} = State0) ->
- try
- {Packets, Buf} = tls_handshake:get_tls_handshake(Version,Data,Buf0, Options),
- State1 =
- 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);
- _ ->
- Events = tls_handshake_events(Packets),
- case StateName of
- connection ->
- ssl_connection:hibernate_after(StateName, State1, Events);
- _ ->
- {next_state, StateName,
- State1#state{unprocessed_handshake_events = unprocessed_events(Events)}, Events}
- end
- end
- catch throw:#alert{} = Alert ->
- ssl_connection:handle_own_alert(Alert, Version, StateName, State0)
- end;
-%%% TLS record protocol level application data messages
-handle_common_event(internal, #ssl_tls{type = ?APPLICATION_DATA, fragment = Data}, StateName, State) ->
- {next_state, StateName, State, [{next_event, internal, {application_data, Data}}]};
-%%% TLS record protocol level change cipher messages
-handle_common_event(internal, #ssl_tls{type = ?CHANGE_CIPHER_SPEC, fragment = Data}, StateName, State) ->
- {next_state, StateName, State, [{next_event, internal, #change_cipher_spec{type = Data}}]};
-%%% TLS record protocol level Alert messages
-handle_common_event(internal, #ssl_tls{type = ?ALERT, fragment = EncAlerts}, StateName,
- #state{negotiated_version = Version} = State) ->
- try decode_alerts(EncAlerts) of
- Alerts = [_|_] ->
- handle_alerts(Alerts, {next_state, StateName, State});
- [] ->
- ssl_connection:handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, empty_alert),
- Version, StateName, State);
- #alert{} = Alert ->
- ssl_connection:handle_own_alert(Alert, Version, StateName, State)
- catch
- _:_ ->
- ssl_connection:handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, alert_decode_error),
- Version, StateName, State)
-
- end;
-%% Ignore unknown TLS record level protocol messages
-handle_common_event(internal, #ssl_tls{type = _Unknown}, StateName, State) ->
- {next_state, StateName, State}.
-
-send(Transport, Socket, Data) ->
- tls_socket:send(Transport, Socket, Data).
-
-%%--------------------------------------------------------------------
+%--------------------------------------------------------------------
%% gen_statem callbacks
%%--------------------------------------------------------------------
+callback_mode() ->
+ state_functions.
+
terminate(Reason, StateName, State) ->
catch ssl_connection:terminate(Reason, StateName, State).
format_status(Type, Data) ->
ssl_connection:format_status(Type, Data).
-%%--------------------------------------------------------------------
-%% code_change(OldVsn, StateName, State, Extra) -> {ok, StateName, NewState}
-%% Description: Convert process state when code is changed
-%%--------------------------------------------------------------------
code_change(_OldVsn, StateName, State0, {Direction, From, To}) ->
State = convert_state(State0, Direction, From, To),
{ok, StateName, State};
@@ -524,19 +595,6 @@ code_change(_OldVsn, StateName, State, _) ->
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
-encode_handshake(Handshake, Version, ConnectionStates0, Hist0, V2HComp) ->
- Frag = tls_handshake:encode_handshake(Handshake, Version),
- Hist = ssl_handshake:update_handshake_history(Hist0, Frag, V2HComp),
- {Encoded, ConnectionStates} =
- tls_record:encode_handshake(Frag, Version, ConnectionStates0),
- {Encoded, ConnectionStates, Hist}.
-
-encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
- tls_record:encode_change_cipher_spec(Version, ConnectionStates).
-
-decode_alerts(Bin) ->
- ssl_alert:decode(Bin).
-
initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions, Tracker}, User,
{CbModule, DataTag, CloseTag, ErrorTag}) ->
#ssl_options{beast_mitigation = BeastMitigation} = SSLOptions,
@@ -586,108 +644,59 @@ next_tls_record(Data, #state{protocol_buffers = #protocol_buffers{tls_record_buf
#alert{} = Alert ->
Alert
end.
-next_record(#state{unprocessed_handshake_events = N} = State) when N > 0 ->
- {no_record, State#state{unprocessed_handshake_events = N-1}};
-
-next_record(#state{protocol_buffers =
- #protocol_buffers{tls_packets = [], tls_cipher_texts = [CT | Rest]}
- = Buffers,
- connection_states = ConnStates0,
- ssl_options = #ssl_options{padding_check = Check}} = State) ->
- case tls_record:decode_cipher_text(CT, ConnStates0, Check) of
- {Plain, ConnStates} ->
- {Plain, State#state{protocol_buffers =
- Buffers#protocol_buffers{tls_cipher_texts = Rest},
- connection_states = ConnStates}};
- #alert{} = Alert ->
- {Alert, State}
- end;
-next_record(#state{protocol_buffers = #protocol_buffers{tls_packets = [], tls_cipher_texts = []},
- socket = Socket,
- transport_cb = Transport} = State) ->
- case tls_socket:setopts(Transport, Socket, [{active,once}]) of
- ok ->
- {no_record, State};
- _ ->
- {socket_closed, State}
- end;
-next_record(State) ->
- {no_record, State}.
-
-next_record_if_active(State =
- #state{socket_options =
- #socket_options{active = false}}) ->
- {no_record ,State};
-
-next_record_if_active(State) ->
- next_record(State).
-
-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_event(StateName, Record, State) ->
- next_event(StateName, Record, State, []).
-
-next_event(StateName, socket_closed, State, _) ->
- ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
- {stop, {shutdown, transport_closed}, 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);
- {socket_closed, State} ->
- next_event(StateName, socket_closed, 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
- no_record ->
- {next_state, StateName, State, Actions};
- #ssl_tls{} = Record ->
- {next_state, StateName, State, [{next_event, internal, {protocol_record, Record}} | Actions]};
- #alert{} = Alert ->
- {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
- end.
tls_handshake_events(Packets) ->
lists:map(fun(Packet) ->
{next_event, internal, {handshake, Packet}}
end, Packets).
+handle_call(Event, From, StateName, State) ->
+ ssl_connection:handle_call(Event, From, StateName, State, ?MODULE).
+
+%% raw data from socket, unpack records
+handle_info({Protocol, _, Data}, StateName,
+ #state{data_tag = Protocol} = State0) ->
+ case next_tls_record(Data, State0) of
+ {Record, State} ->
+ next_event(StateName, Record, State);
+ #alert{} = Alert ->
+ ssl_connection:handle_normal_shutdown(Alert, StateName, State0),
+ {stop, {shutdown, own_alert}}
+ end;
+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},
+ negotiated_version = Version} = State) ->
-renegotiate(#state{role = client} = State, Actions) ->
- %% Handle same way as if server requested
- %% the renegotiation
- Hs0 = ssl_handshake:init_handshake_history(),
- {next_state, connection, State#state{tls_handshake_history = Hs0},
- [{next_event, internal, #hello_request{}} | Actions]};
+ %% Note that as of TLS 1.1,
+ %% failure to properly close a connection no longer requires that a
+ %% session not be resumed. This is a change from TLS 1.0 to conform
+ %% with widespread implementation practice.
-renegotiate(#state{role = server,
- socket = Socket,
- transport_cb = Transport,
- negotiated_version = Version,
- connection_states = ConnectionStates0} = State0, Actions) ->
- HelloRequest = ssl_handshake:hello_request(),
- Frag = tls_handshake:encode_handshake(HelloRequest, Version),
- Hs0 = ssl_handshake:init_handshake_history(),
- {BinMsg, ConnectionStates} =
- tls_record:encode_handshake(Frag, Version, ConnectionStates0),
- send(Transport, Socket, BinMsg),
- State1 = State0#state{connection_states =
- ConnectionStates,
- tls_handshake_history = Hs0},
- {Record, State} = next_record(State1),
- next_event(hello, Record, State, Actions).
+ case (Active == false) andalso (CTs =/= []) of
+ false ->
+ case Version of
+ {1, N} when N >= 1 ->
+ ok;
+ _ ->
+ %% As invalidate_sessions here causes performance issues,
+ %% we will conform to the widespread implementation
+ %% practice and go aginst the spec
+ %%invalidate_session(Role, Host, Port, Session)
+ ok
+ end,
+
+ ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
+ {stop, {shutdown, transport_closed}};
+ 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)
+ end;
+handle_info(Msg, StateName, State) ->
+ ssl_connection:handle_info(Msg, StateName, State).
handle_alerts([], Result) ->
Result;
@@ -698,43 +707,18 @@ handle_alerts([Alert | Alerts], {next_state, StateName, State}) ->
handle_alerts([Alert | Alerts], {next_state, StateName, State, _Actions}) ->
handle_alerts(Alerts, ssl_connection:handle_alert(Alert, StateName, State)).
+encode_handshake(Handshake, Version, ConnectionStates0, Hist0, V2HComp) ->
+ Frag = tls_handshake:encode_handshake(Handshake, Version),
+ Hist = ssl_handshake:update_handshake_history(Hist0, Frag, V2HComp),
+ {Encoded, ConnectionStates} =
+ tls_record:encode_handshake(Frag, Version, ConnectionStates0),
+ {Encoded, ConnectionStates, Hist}.
-%% User closes or recursive call!
-close({close, Timeout}, Socket, Transport = gen_tcp, _,_) ->
- tls_socket:setopts(Transport, Socket, [{active, false}]),
- Transport:shutdown(Socket, write),
- _ = Transport:recv(Socket, 0, Timeout),
- ok;
-%% Peer closed socket
-close({shutdown, transport_closed}, Socket, Transport = gen_tcp, ConnectionStates, Check) ->
- close({close, 0}, Socket, Transport, ConnectionStates, Check);
-%% We generate fatal alert
-close({shutdown, own_alert}, Socket, Transport = gen_tcp, ConnectionStates, Check) ->
- %% Standard trick to try to make sure all
- %% data sent to the tcp port is really delivered to the
- %% peer application before tcp port is closed so that the peer will
- %% get the correct TLS alert message and not only a transport close.
- %% Will return when other side has closed or after timout millisec
- %% e.g. we do not want to hang if something goes wrong
- %% with the network but we want to maximise the odds that
- %% peer application gets all data sent on the tcp connection.
- close({close, ?DEFAULT_TIMEOUT}, Socket, Transport, ConnectionStates, Check);
-close(downgrade, _,_,_,_) ->
- ok;
-%% Other
-close(_, Socket, Transport, _,_) ->
- Transport:close(Socket).
-
-convert_state(#state{ssl_options = Options} = State, up, "5.3.5", "5.3.6") ->
- State#state{ssl_options = convert_options_partial_chain(Options, up)};
-convert_state(#state{ssl_options = Options} = State, down, "5.3.6", "5.3.5") ->
- State#state{ssl_options = convert_options_partial_chain(Options, down)}.
+encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
+ tls_record:encode_change_cipher_spec(Version, ConnectionStates).
-convert_options_partial_chain(Options, up) ->
- {Head, Tail} = lists:split(5, tuple_to_list(Options)),
- list_to_tuple(Head ++ [{partial_chain, fun(_) -> unknown_ca end}] ++ Tail);
-convert_options_partial_chain(Options, down) ->
- list_to_tuple(proplists:delete(partial_chain, tuple_to_list(Options))).
+decode_alerts(Bin) ->
+ ssl_alert:decode(Bin).
gen_handshake(GenConnection, StateName, Type, Event,
#state{negotiated_version = Version} = State) ->
@@ -799,3 +783,14 @@ assert_buffer_sanity(Bin, _) ->
throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE,
malformed_handshake_data))
end.
+
+convert_state(#state{ssl_options = Options} = State, up, "5.3.5", "5.3.6") ->
+ State#state{ssl_options = convert_options_partial_chain(Options, up)};
+convert_state(#state{ssl_options = Options} = State, down, "5.3.6", "5.3.5") ->
+ State#state{ssl_options = convert_options_partial_chain(Options, down)}.
+
+convert_options_partial_chain(Options, up) ->
+ {Head, Tail} = lists:split(5, tuple_to_list(Options)),
+ list_to_tuple(Head ++ [{partial_chain, fun(_) -> unknown_ca end}] ++ Tail);
+convert_options_partial_chain(Options, down) ->
+ list_to_tuple(proplists:delete(partial_chain, tuple_to_list(Options))).