aboutsummaryrefslogtreecommitdiffstats
path: root/lib/ssl/src/dtls_connection.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ssl/src/dtls_connection.erl')
-rw-r--r--lib/ssl/src/dtls_connection.erl408
1 files changed, 286 insertions, 122 deletions
diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl
index 60a61bc901..b8be686b99 100644
--- a/lib/ssl/src/dtls_connection.erl
+++ b/lib/ssl/src/dtls_connection.erl
@@ -42,9 +42,8 @@
-export([next_record/1, next_event/3]).
%% Handshake handling
--export([%%renegotiate/2,
- send_handshake/2, send_change_cipher/2]).
-
+-export([%%renegotiate/2,
+ send_handshake/2, queue_handshake/2, queue_change_cipher/2]).
%% Alert and close handling
-export([%%send_alert/2, handle_own_alert/4, handle_close_alert/3,
@@ -53,11 +52,12 @@
]).
%% Data handling
+
-export([%%write_application_data/3,
read_application_data/2,
- %%passive_receive/2,
- next_record_if_active/1 %%,
- %%handle_common_event/4
+ passive_receive/2, next_record_if_active/1%,
+ %%handle_common_event/4,
+ %handle_packet/3
]).
%% gen_statem state functions
@@ -72,13 +72,13 @@
%%====================================================================
%% Internal application API
%%====================================================================
-start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_} = Opts,
+start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_, Tracker} = Opts,
User, {CbModule, _,_, _} = CbInfo,
Timeout) ->
try
{ok, Pid} = dtls_connection_sup:start_child([Role, Host, Port, Socket,
Opts, User, CbInfo]),
- {ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule),
+ {ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule, Tracker),
ok = ssl_connection:handshake(SslSocket, Timeout),
{ok, SslSocket}
catch
@@ -86,13 +86,13 @@ start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_} = Opts,
Error
end;
-start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_} = Opts,
+start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_, Tracker} = Opts,
User, {CbModule, _,_, _} = CbInfo,
Timeout) ->
try
{ok, Pid} = dtls_connection_sup:start_child_dist([Role, Host, Port, Socket,
Opts, User, CbInfo]),
- {ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule),
+ {ok, SslSocket} = ssl_connection:socket_control(?MODULE, Socket, Pid, CbModule, Tracker),
ok = ssl_connection:handshake(SslSocket, Timeout),
{ok, SslSocket}
catch
@@ -100,14 +100,37 @@ start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_} = Opts,
Error
end.
-send_handshake(Handshake, #state{negotiated_version = Version,
- tls_handshake_history = Hist0,
- connection_states = ConnectionStates0} = State0) ->
- {BinHandshake, ConnectionStates, Hist} =
+send_handshake(Handshake, State) ->
+ send_handshake_flight(queue_handshake(Handshake, State)).
+
+queue_flight_buffer(Msg, #state{negotiated_version = Version,
+ connection_states = #connection_states{
+ current_write =
+ #connection_state{epoch = Epoch}},
+ flight_buffer = Flight} = State) ->
+ State#state{flight_buffer = Flight ++ [{Version, Epoch, Msg}]}.
+
+queue_handshake(Handshake, #state{negotiated_version = Version,
+ tls_handshake_history = Hist0,
+ connection_states = ConnectionStates0} = State0) ->
+ {Frag, ConnectionStates, Hist} =
encode_handshake(Handshake, Version, ConnectionStates0, Hist0),
- send_flight(BinHandshake, State0#state{connection_states = ConnectionStates,
- tls_handshake_history = Hist
- }).
+ queue_flight_buffer(Frag, State0#state{connection_states = ConnectionStates,
+ tls_handshake_history = Hist}).
+
+send_handshake_flight(#state{socket = Socket,
+ transport_cb = Transport,
+ flight_buffer = Flight,
+ connection_states = ConnectionStates0} = State0) ->
+
+ {Encoded, ConnectionStates} =
+ encode_handshake_flight(Flight, ConnectionStates0),
+
+ Transport:send(Socket, Encoded),
+ State0#state{flight_buffer = [], connection_states = ConnectionStates}.
+
+queue_change_cipher(Msg, State) ->
+ queue_flight_buffer(Msg, State).
send_alert(Alert, #state{negotiated_version = Version,
socket = Socket,
@@ -118,15 +141,6 @@ send_alert(Alert, #state{negotiated_version = Version,
Transport:send(Socket, BinMsg),
State0#state{connection_states = ConnectionStates}.
-send_change_cipher(Msg, #state{connection_states = ConnectionStates0,
- socket = Socket,
- negotiated_version = Version,
- transport_cb = Transport} = State0) ->
- {BinChangeCipher, ConnectionStates} =
- encode_change_cipher(Msg, Version, ConnectionStates0),
- Transport:send(Socket, BinChangeCipher),
- State0#state{connection_states = ConnectionStates}.
-
%%====================================================================
%% tls_connection_sup API
%%====================================================================
@@ -196,28 +210,44 @@ error({call, From}, Msg, State) ->
error(_, _, _) ->
{keep_state_and_data, [postpone]}.
-hello(internal, #client_hello{client_version = ClientVersion} = Hello,
- #state{connection_states = ConnectionStates0,
- port = Port, session = #session{own_certificate = Cert} = Session0,
- renegotiation = {Renegotiation, _},
- session_cache = Cache,
- session_cache_cb = CacheCb,
- ssl_options = SslOpts} = State) ->
+%%--------------------------------------------------------------------
+-spec hello(gen_statem:event_type(),
+ #hello_request{} | #client_hello{} | #server_hello{} | term(),
+ #state{}) ->
+ gen_statem:state_function_result().
+%%--------------------------------------------------------------------
+hello(internal, #client_hello{client_version = ClientVersion,
+ extensions = #hello_extensions{ec_point_formats = EcPointFormats,
+ elliptic_curves = EllipticCurves}} = Hello,
+ State = #state{connection_states = ConnectionStates0,
+ port = Port, session = #session{own_certificate = Cert} = Session0,
+ renegotiation = {Renegotiation, _},
+ session_cache = Cache,
+ session_cache_cb = CacheCb,
+ negotiated_protocol = CurrentProtocol,
+ key_algorithm = KeyExAlg,
+ ssl_options = SslOpts}) ->
+
case dtls_handshake:hello(Hello, SslOpts, {Port, Session0, Cache, CacheCb,
- ConnectionStates0, Cert}, Renegotiation) of
- {Version, {Type, Session},
- ConnectionStates,
- #hello_extensions{ec_point_formats = EcPointFormats,
- elliptic_curves = EllipticCurves} = ServerHelloExt, HashSign} ->
- ssl_connection:hello(internal, {common_client_hello, Type, ServerHelloExt, HashSign},
- State#state{connection_states = ConnectionStates,
+ ConnectionStates0, Cert, KeyExAlg}, Renegotiation) of
+ #alert{} = Alert ->
+ handle_own_alert(Alert, ClientVersion, hello, State);
+ {Version, {Type, Session},
+ ConnectionStates, Protocol0, ServerHelloExt, HashSign} ->
+ Protocol = case Protocol0 of
+ undefined -> CurrentProtocol;
+ _ -> Protocol0
+ end,
+
+ ssl_connection:hello(internal, {common_client_hello, Type, ServerHelloExt},
+ State#state{connection_states = ConnectionStates,
negotiated_version = Version,
+ hashsign_algorithm = HashSign,
session = Session,
- client_ecc = {EllipticCurves, EcPointFormats}}, ?MODULE);
- #alert{} = Alert ->
- handle_own_alert(Alert, ClientVersion, hello, State)
+ client_ecc = {EllipticCurves, EcPointFormats},
+ negotiated_protocol = Protocol}, ?MODULE)
end;
-hello(internal, Hello,
+hello(internal, #server_hello{} = Hello,
#state{connection_states = ConnectionStates0,
negotiated_version = ReqVersion,
role = client,
@@ -261,8 +291,7 @@ connection(internal, #hello_request{}, #state{host = Host, port = Port,
renegotiation = {Renegotiation, _}} = State0) ->
Hello = dtls_handshake:client_hello(Host, Port, ConnectionStates0, SslOpts,
Cache, CacheCb, Renegotiation, Cert),
- %% TODO DTLS version State1 = send_handshake(Hello, State0),
- State1 = State0,
+ State1 = send_handshake(Hello, State0),
{Record, State} =
next_record(
State1#state{session = Session0#session{session_id
@@ -309,11 +338,24 @@ handle_info({Protocol, _, Data}, StateName,
{stop, {shutdown, own_alert}}
end;
handle_info({CloseTag, Socket}, StateName,
- #state{socket = Socket, close_tag = CloseTag,
- negotiated_version = _Version} = State) ->
+ #state{socket = Socket, close_tag = CloseTag,
+ negotiated_version = Version} = State) ->
+ %% Note that as of DTLS 1.2 (TLS 1.1),
+ %% failure to properly close a connection no longer requires that a
+ %% session not be resumed. This is a change from DTLS 1.0 to conform
+ %% with widespread implementation practice.
+ case Version of
+ {254, N} when N =< 253 ->
+ 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,
handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
{stop, {shutdown, transport_closed}};
-
handle_info(Msg, StateName, State) ->
ssl_connection:handle_info(Msg, StateName, State).
@@ -343,76 +385,82 @@ format_status(Type, Data) ->
%%% Internal functions
%%--------------------------------------------------------------------
encode_handshake(Handshake, Version, ConnectionStates0, Hist0) ->
- Seq = sequence(ConnectionStates0),
- {EncHandshake, FragmentedHandshake} = dtls_handshake:encode_handshake(Handshake, Version,
- Seq),
+ {Seq, ConnectionStates} = sequence(ConnectionStates0),
+ {EncHandshake, Frag} = dtls_handshake:encode_handshake(Handshake, Version, Seq),
Hist = ssl_handshake:update_handshake_history(Hist0, EncHandshake),
- {Encoded, ConnectionStates} =
- dtls_record:encode_handshake(FragmentedHandshake,
- Version, ConnectionStates0),
- {Encoded, ConnectionStates, Hist}.
-
-next_record(#state{%%flight = #flight{state = finished},
- protocol_buffers =
- #protocol_buffers{dtls_packets = [], dtls_cipher_texts = [CT | Rest]}
- = Buffers,
- connection_states = ConnStates0} = State) ->
- case dtls_record:decode_cipher_text(CT, ConnStates0) of
- {Plain, ConnStates} ->
- {Plain, State#state{protocol_buffers =
- Buffers#protocol_buffers{dtls_cipher_texts = Rest},
- connection_states = ConnStates}};
- #alert{} = Alert ->
- {Alert, State}
- end;
-next_record(#state{socket = Socket,
- transport_cb = Transport} = State) -> %% when FlightState =/= finished
- ssl_socket:setopts(Transport, Socket, [{active,once}]),
- {no_record, State};
-
+ {Frag, ConnectionStates, Hist}.
-next_record(State) ->
- {no_record, State}.
+encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
+ dtls_record:encode_change_cipher_spec(Version, ConnectionStates).
+encode_handshake_flight(Flight, ConnectionStates) ->
+ MSS = 1400,
+ encode_handshake_records(Flight, ConnectionStates, MSS, init_pack_records()).
-next_event(StateName, Record, State) ->
- next_event(StateName, Record, State, []).
+encode_handshake_records([], CS, _MSS, Recs) ->
+ {finish_pack_records(Recs), CS};
-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, {dtls_record, Record}} | Actions]};
- {#alert{} = Alert, State} ->
- {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
+encode_handshake_records([{Version, _Epoch, Frag = #change_cipher_spec{}}|Tail], ConnectionStates0, MSS, Recs0) ->
+ {Encoded, ConnectionStates} =
+ encode_change_cipher(Frag, Version, ConnectionStates0),
+ Recs = append_pack_records([Encoded], MSS, Recs0),
+ encode_handshake_records(Tail, ConnectionStates, MSS, Recs);
+
+encode_handshake_records([{Version, Epoch, {MsgType, MsgSeq, Bin}}|Tail], CS0, MSS, Recs0 = {Buf0, _}) ->
+ Space = MSS - iolist_size(Buf0),
+ Len = byte_size(Bin),
+ {Encoded, CS} =
+ encode_handshake_record(Version, Epoch, Space, MsgType, MsgSeq, Len, Bin, 0, MSS, [], CS0),
+ Recs = append_pack_records(Encoded, MSS, Recs0),
+ encode_handshake_records(Tail, CS, MSS, Recs).
+
+%% TODO: move to dtls_handshake????
+encode_handshake_record(_Version, _Epoch, _Space, _MsgType, _MsgSeq, _Len, <<>>, _Offset, _MRS, Encoded, CS)
+ when length(Encoded) > 0 ->
+ %% make sure we encode at least one segment (for empty messages like Server Hello Done
+ {lists:reverse(Encoded), CS};
+
+encode_handshake_record(Version, Epoch, Space, MsgType, MsgSeq, Len, Bin,
+ Offset, MRS, Encoded0, CS0) ->
+ MaxFragmentLen = Space - 25,
+ case Bin of
+ <<BinFragment:MaxFragmentLen/bytes, Rest/binary>> ->
+ ok;
+ _ ->
+ BinFragment = Bin,
+ Rest = <<>>
+ end,
+ FragLength = byte_size(BinFragment),
+ Frag = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(Offset), ?uint24(FragLength), BinFragment],
+ %% TODO Real solution, now avoid dialyzer error {Encoded, CS} = ssl_record:encode_handshake({Epoch, Frag}, Version, CS0),
+ {Encoded, CS} = ssl_record:encode_handshake(Frag, Version, CS0),
+ encode_handshake_record(Version, Epoch, MRS, MsgType, MsgSeq, Len, Rest, Offset + FragLength, MRS, [Encoded|Encoded0], CS).
+
+init_pack_records() ->
+ {[], []}.
+
+append_pack_records([], MSS, Recs = {Buf0, Acc0}) ->
+ Remaining = MSS - iolist_size(Buf0),
+ if Remaining < 12 ->
+ {[], [lists:reverse(Buf0)|Acc0]};
+ true ->
+ Recs
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, {dtls_record, Record}} | Actions]};
- #alert{} = Alert ->
- {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
+append_pack_records([Head|Tail], MSS, {Buf0, Acc0}) ->
+ TotLen = iolist_size(Buf0) + iolist_size(Head),
+ if TotLen > MSS ->
+ append_pack_records(Tail, MSS, {[Head], [lists:reverse(Buf0)|Acc0]});
+ true ->
+ append_pack_records(Tail, MSS, {[Head|Buf0], Acc0})
end.
-send_flight(Fragments, #state{transport_cb = Transport, socket = Socket,
- protocol_buffers = _PBuffers} = State) ->
- Transport:send(Socket, Fragments),
- %% Start retransmission
- %% State#state{protocol_buffers =
- %% (PBuffers#protocol_buffers){ #flight{state = waiting}}}}.
- State.
+finish_pack_records({[], Acc}) ->
+ lists:reverse(Acc);
+finish_pack_records({Buf, Acc}) ->
+ lists:reverse([lists:reverse(Buf)|Acc]).
-handle_own_alert(_,_,_, State) -> %% Place holder
- {stop, {shutdown, own_alert}, State}.
-
-handle_normal_shutdown(_, _, _State) -> %% Place holder
- ok.
-
-encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
- dtls_record:encode_change_cipher_spec(Version, ConnectionStates).
+%% decode_alerts(Bin) ->
+%% ssl_alert:decode(Bin).
initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User,
{CbModule, DataTag, CloseTag, ErrorTag}) ->
@@ -451,21 +499,137 @@ initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User,
start_or_recv_from = undefined,
protocol_cb = ?MODULE
}.
-read_application_data(_,State) ->
- {#ssl_tls{fragment = <<"place holder">>}, State}.
-next_tls_record(<<>>, _State) ->
- #alert{}; %% Place holder
-next_tls_record(_, State) ->
- {#ssl_tls{fragment = <<"place holder">>}, State}.
+next_tls_record(Data, #state{protocol_buffers = #protocol_buffers{
+ dtls_record_buffer = Buf0,
+ dtls_cipher_texts = CT0} = Buffers} = State0) ->
+ case dtls_record:get_dtls_records(Data, Buf0) of
+ {Records, Buf1} ->
+ CT1 = CT0 ++ Records,
+ next_record(State0#state{protocol_buffers =
+ Buffers#protocol_buffers{dtls_record_buffer = Buf1,
+ dtls_cipher_texts = CT1}});
+
+ #alert{} = Alert ->
+ Alert
+ end.
+
+next_record(#state{%%flight = #flight{state = finished},
+ protocol_buffers =
+ #protocol_buffers{dtls_packets = [], dtls_cipher_texts = [CT | Rest]}
+ = Buffers,
+ connection_states = ConnStates0} = State) ->
+ case dtls_record:decode_cipher_text(CT, ConnStates0) of
+ {Plain, ConnStates} ->
+ {Plain, State#state{protocol_buffers =
+ Buffers#protocol_buffers{dtls_cipher_texts = Rest},
+ connection_states = ConnStates}};
+ #alert{} = Alert ->
+ {Alert, State}
+ end;
+next_record(#state{socket = Socket,
+ transport_cb = Transport} = State) -> %% when FlightState =/= finished
+ ssl_socket:setopts(Transport, Socket, [{active,once}]),
+ {no_record, State};
+next_record(State) ->
+ {no_record, State}.
-sequence(_) ->
- %%TODO real imp
- 1.
-next_record_if_active(State =
- #state{socket_options =
- #socket_options{active = false}}) ->
+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} = read_application_data(<<>>, State0),
+ next_event(StateName, Record, State)
+ end.
+
+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, {dtls_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, {dtls_record, Record}} | Actions]};
+ #alert{} = Alert ->
+ {next_state, StateName, State, [{next_event, internal, Alert} | Actions]}
+ end.
+
+read_application_data(_,State) ->
+ {#ssl_tls{fragment = <<"place holder">>}, State}.
+
+handle_own_alert(_,_,_, State) -> %% Place holder
+ {stop, {shutdown, own_alert}, State}.
+
+handle_normal_shutdown(_, _, _State) -> %% Place holder
+ ok.
+
+%% TODO This generates dialyzer warnings, has to be handled differently.
+%% handle_packet(Address, Port, Packet) ->
+%% try dtls_record:get_dtls_records(Packet, <<>>) of
+%% %% expect client hello
+%% {[#ssl_tls{type = ?HANDSHAKE, version = {254, _}} = Record], <<>>} ->
+%% handle_dtls_client_hello(Address, Port, Record);
+%% _Other ->
+%% {error, not_dtls}
+%% catch
+%% _Class:_Error ->
+%% {error, not_dtls}
+%% end.
+
+%% handle_dtls_client_hello(Address, Port,
+%% #ssl_tls{epoch = Epoch, sequence_number = Seq,
+%% version = Version} = Record) ->
+%% {[{Hello, _}], _} =
+%% dtls_handshake:get_dtls_handshake(Record,
+%% dtls_handshake:dtls_handshake_new_flight(undefined)),
+%% #client_hello{client_version = {Major, Minor},
+%% random = Random,
+%% session_id = SessionId,
+%% cipher_suites = CipherSuites,
+%% compression_methods = CompressionMethods} = Hello,
+%% CookieData = [address_to_bin(Address, Port),
+%% <<?BYTE(Major), ?BYTE(Minor)>>,
+%% Random, SessionId, CipherSuites, CompressionMethods],
+%% Cookie = crypto:hmac(sha, <<"secret">>, CookieData),
+
+%% case Hello of
+%% #client_hello{cookie = Cookie} ->
+%% accept;
+
+%% _ ->
+%% %% generate HelloVerifyRequest
+%% {RequestFragment, _} = dtls_handshake:encode_handshake(
+%% dtls_handshake:hello_verify_request(Cookie),
+%% Version, 0),
+%% HelloVerifyRequest =
+%% dtls_record:encode_tls_cipher_text(?HANDSHAKE, Version, Epoch, Seq, RequestFragment),
+%% {reply, HelloVerifyRequest}
+%% end.
+
+%% address_to_bin({A,B,C,D}, Port) ->
+%% <<0:80,16#ffff:16,A,B,C,D,Port:16>>;
+%% address_to_bin({A,B,C,D,E,F,G,H}, Port) ->
+%% <<A:16,B:16,C:16,D:16,E:16,F:16,G:16,H:16,Port:16>>.
+
+sequence(#connection_states{dtls_write_msg_seq = Seq} = CS) ->
+ {Seq, CS#connection_states{dtls_write_msg_seq = Seq + 1}}.
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-03 11:46:46 +0000