%% %% %CopyrightBegin% %% %% Copyright Ericsson AB 2013-2017. 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% %% %% %%---------------------------------------------------------------------- %% Purpose: Common handling of a TLS/SSL/DTLS connection, see also %% tls_connection.erl and dtls_connection.erl %%---------------------------------------------------------------------- -module(ssl_connection). -include("ssl_api.hrl"). -include("ssl_connection.hrl"). -include("ssl_handshake.hrl"). -include("ssl_alert.hrl"). -include("ssl_record.hrl"). -include("ssl_cipher.hrl"). -include("ssl_internal.hrl"). -include("ssl_srp.hrl"). -include_lib("public_key/include/public_key.hrl"). %% Setup -export([connect/8, ssl_accept/7, handshake/2, handshake/3, socket_control/4, socket_control/5, start_or_recv_cancel_timer/2]). %% User Events -export([send/2, recv/3, close/2, shutdown/2, new_user/2, get_opts/2, set_opts/2, session_info/1, peer_certificate/1, renegotiation/1, negotiated_protocol/1, prf/5, connection_information/1, handle_common_event/5 ]). %% General gen_statem state functions with extra callback argument %% to determine if it is an SSL/TLS or DTLS gen_statem machine -export([init/4, hello/4, abbreviated/4, certify/4, cipher/4, connection/4, downgrade/4]). %% gen_statem callbacks -export([terminate/3, format_status/2]). %% -export([handle_info/3, handle_call/5, handle_session/7, ssl_config/3, prepare_connection/2, hibernate_after/3]). %% Alert and close handling -export([handle_own_alert/4,handle_alert/3, handle_normal_shutdown/3 ]). %% Data handling -export([write_application_data/3, read_application_data/2]). %%==================================================================== %% Internal application API %%==================================================================== %%-------------------------------------------------------------------- -spec connect(tls_connection | dtls_connection, host(), inet:port_number(), port() | {tuple(), port()}, %% TLS | DTLS {#ssl_options{}, #socket_options{}, %% Tracker only needed on server side undefined}, pid(), tuple(), timeout()) -> {ok, #sslsocket{}} | {error, reason()}. %% %% Description: Connect to an ssl server. %%-------------------------------------------------------------------- connect(Connection, Host, Port, Socket, Options, User, CbInfo, Timeout) -> try Connection:start_fsm(client, Host, Port, Socket, Options, User, CbInfo, Timeout) catch exit:{noproc, _} -> {error, ssl_not_started} end. %%-------------------------------------------------------------------- -spec ssl_accept(tls_connection | dtls_connection, inet:port_number(), port(), {#ssl_options{}, #socket_options{}, undefined | pid()}, pid(), tuple(), timeout()) -> {ok, #sslsocket{}} | {error, reason()}. %% %% Description: Performs accept on an ssl listen socket. e.i. performs %% ssl handshake. %%-------------------------------------------------------------------- ssl_accept(Connection, Port, Socket, Opts, User, CbInfo, Timeout) -> try Connection:start_fsm(server, "localhost", Port, Socket, Opts, User, CbInfo, Timeout) catch exit:{noproc, _} -> {error, ssl_not_started} end. %%-------------------------------------------------------------------- -spec handshake(#sslsocket{}, timeout()) -> ok | {error, reason()}. %% %% Description: Starts ssl handshake. %%-------------------------------------------------------------------- handshake(#sslsocket{pid = Pid}, Timeout) -> case call(Pid, {start, Timeout}) of connected -> ok; Error -> Error end. %%-------------------------------------------------------------------- -spec handshake(#sslsocket{}, {#ssl_options{},#socket_options{}}, timeout()) -> ok | {error, reason()}. %% %% Description: Starts ssl handshake with some new options %%-------------------------------------------------------------------- handshake(#sslsocket{pid = Pid}, SslOptions, Timeout) -> case call(Pid, {start, SslOptions, Timeout}) of connected -> ok; Error -> Error end. %-------------------------------------------------------------------- -spec socket_control(tls_connection | dtls_connection, port(), pid(), atom()) -> {ok, #sslsocket{}} | {error, reason()}. %% %% Description: Set the ssl process to own the accept socket %%-------------------------------------------------------------------- socket_control(Connection, Socket, Pid, Transport) -> socket_control(Connection, Socket, Pid, Transport, undefined). %-------------------------------------------------------------------- -spec socket_control(tls_connection | dtls_connection, port(), pid(), atom(), pid()| undefined) -> {ok, #sslsocket{}} | {error, reason()}. %%-------------------------------------------------------------------- socket_control(Connection, Socket, Pid, Transport, udp_listner) -> %% dtls listner process must have the socket control {ok, Connection:socket(Pid, Transport, Socket, Connection, undefined)}; socket_control(tls_connection = Connection, Socket, Pid, Transport, ListenTracker) -> case Transport:controlling_process(Socket, Pid) of ok -> {ok, Connection:socket(Pid, Transport, Socket, Connection, ListenTracker)}; {error, Reason} -> {error, Reason} end; socket_control(dtls_connection = Connection, {_, Socket}, Pid, Transport, ListenTracker) -> case Transport:controlling_process(Socket, Pid) of ok -> {ok, Connection:socket(Pid, Transport, Socket, Connection, ListenTracker)}; {error, Reason} -> {error, Reason} end. %%-------------------------------------------------------------------- -spec send(pid(), iodata()) -> ok | {error, reason()}. %% %% Description: Sends data over the ssl connection %%-------------------------------------------------------------------- send(Pid, Data) -> call(Pid, {application_data, %% iolist_to_binary should really %% be called iodata_to_binary() erlang:iolist_to_binary(Data)}). %%-------------------------------------------------------------------- -spec recv(pid(), integer(), timeout()) -> {ok, binary() | list()} | {error, reason()}. %% %% Description: Receives data when active = false %%-------------------------------------------------------------------- recv(Pid, Length, Timeout) -> call(Pid, {recv, Length, Timeout}). %%-------------------------------------------------------------------- -spec connection_information(pid()) -> {ok, list()} | {error, reason()}. %% %% Description: Get the SNI hostname %%-------------------------------------------------------------------- connection_information(Pid) when is_pid(Pid) -> call(Pid, connection_information). %%-------------------------------------------------------------------- -spec close(pid(), {close, Timeout::integer() | {NewController::pid(), Timeout::integer()}}) -> ok | {ok, port()} | {error, reason()}. %% %% Description: Close an ssl connection %%-------------------------------------------------------------------- close(ConnectionPid, How) -> case call(ConnectionPid, How) of {error, closed} -> ok; Other -> Other end. %%-------------------------------------------------------------------- -spec shutdown(pid(), atom()) -> ok | {error, reason()}. %% %% Description: Same as gen_tcp:shutdown/2 %%-------------------------------------------------------------------- shutdown(ConnectionPid, How) -> call(ConnectionPid, {shutdown, How}). %%-------------------------------------------------------------------- -spec new_user(pid(), pid()) -> ok | {error, reason()}. %% %% Description: Changes process that receives the messages when active = true %% or once. %%-------------------------------------------------------------------- new_user(ConnectionPid, User) -> call(ConnectionPid, {new_user, User}). %%-------------------------------------------------------------------- -spec negotiated_protocol(pid()) -> {ok, binary()} | {error, reason()}. %% %% Description: Returns the negotiated protocol %%-------------------------------------------------------------------- negotiated_protocol(ConnectionPid) -> call(ConnectionPid, negotiated_protocol). %%-------------------------------------------------------------------- -spec get_opts(pid(), list()) -> {ok, list()} | {error, reason()}. %% %% Description: Same as inet:getopts/2 %%-------------------------------------------------------------------- get_opts(ConnectionPid, OptTags) -> call(ConnectionPid, {get_opts, OptTags}). %%-------------------------------------------------------------------- -spec set_opts(pid(), list()) -> ok | {error, reason()}. %% %% Description: Same as inet:setopts/2 %%-------------------------------------------------------------------- set_opts(ConnectionPid, Options) -> call(ConnectionPid, {set_opts, Options}). %%-------------------------------------------------------------------- -spec session_info(pid()) -> {ok, list()} | {error, reason()}. %% %% Description: Returns info about the ssl session %%-------------------------------------------------------------------- session_info(ConnectionPid) -> call(ConnectionPid, session_info). %%-------------------------------------------------------------------- -spec peer_certificate(pid()) -> {ok, binary()| undefined} | {error, reason()}. %% %% Description: Returns the peer cert %%-------------------------------------------------------------------- peer_certificate(ConnectionPid) -> call(ConnectionPid, peer_certificate). %%-------------------------------------------------------------------- -spec renegotiation(pid()) -> ok | {error, reason()}. %% %% Description: Starts a renegotiation of the ssl session. %%-------------------------------------------------------------------- renegotiation(ConnectionPid) -> call(ConnectionPid, renegotiate). %%-------------------------------------------------------------------- -spec prf(pid(), binary() | 'master_secret', binary(), binary() | ssl:prf_random(), non_neg_integer()) -> {ok, binary()} | {error, reason()} | {'EXIT', term()}. %% %% Description: use a ssl sessions TLS PRF to generate key material %%-------------------------------------------------------------------- prf(ConnectionPid, Secret, Label, Seed, WantedLength) -> call(ConnectionPid, {prf, Secret, Label, Seed, WantedLength}). %%-------------------------------------------------------------------- -spec handle_session(#server_hello{}, ssl_record:ssl_version(), binary(), ssl_record:connection_states(), _,_, #state{}) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- handle_session(#server_hello{cipher_suite = CipherSuite, compression_method = Compression}, Version, NewId, ConnectionStates, ProtoExt, Protocol0, #state{session = #session{session_id = OldId}, negotiated_version = ReqVersion, negotiated_protocol = CurrentProtocol} = State0) -> {KeyAlgorithm, _, _, _} = ssl_cipher:suite_definition(CipherSuite), PremasterSecret = make_premaster_secret(ReqVersion, KeyAlgorithm), {ExpectNPN, Protocol} = case Protocol0 of undefined -> {false, CurrentProtocol}; _ -> {ProtoExt =:= npn, Protocol0} end, State = State0#state{key_algorithm = KeyAlgorithm, negotiated_version = Version, connection_states = ConnectionStates, premaster_secret = PremasterSecret, expecting_next_protocol_negotiation = ExpectNPN, negotiated_protocol = Protocol}, case ssl_session:is_new(OldId, NewId) of true -> handle_new_session(NewId, CipherSuite, Compression, State#state{connection_states = ConnectionStates}); false -> handle_resumed_session(NewId, State#state{connection_states = ConnectionStates}) end. %%-------------------------------------------------------------------- -spec ssl_config(#ssl_options{}, client | server, #state{}) -> #state{}. %%-------------------------------------------------------------------- ssl_config(Opts, Role, State) -> {ok, #{cert_db_ref := Ref, cert_db_handle := CertDbHandle, fileref_db_handle := FileRefHandle, session_cache := CacheHandle, crl_db_info := CRLDbHandle, private_key := Key, dh_params := DHParams, own_certificate := OwnCert}} = ssl_config:init(Opts, Role), Handshake = ssl_handshake:init_handshake_history(), TimeStamp = erlang:monotonic_time(), Session = State#state.session, State#state{tls_handshake_history = Handshake, session = Session#session{own_certificate = OwnCert, time_stamp = TimeStamp}, file_ref_db = FileRefHandle, cert_db_ref = Ref, cert_db = CertDbHandle, crl_db = CRLDbHandle, session_cache = CacheHandle, private_key = Key, diffie_hellman_params = DHParams, ssl_options = Opts}. %%==================================================================== %% gen_statem state functions %%==================================================================== %%-------------------------------------------------------------------- -spec init(gen_statem:event_type(), {start, timeout()} | {start, {list(), list()}, timeout()}| term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- init({call, From}, {start, Timeout}, State0, Connection) -> Timer = start_or_recv_cancel_timer(Timeout, From), {Record, State} = Connection:next_record(State0#state{start_or_recv_from = From, timer = Timer}), Connection:next_event(hello, Record, State); init({call, From}, {start, {Opts, EmOpts}, Timeout}, #state{role = Role, ssl_options = OrigSSLOptions, socket_options = SockOpts} = State0, Connection) -> try SslOpts = ssl:handle_options(Opts, OrigSSLOptions), State = ssl_config(SslOpts, Role, State0), init({call, From}, {start, Timeout}, State#state{ssl_options = SslOpts, socket_options = new_emulated(EmOpts, SockOpts)}, Connection) catch throw:Error -> {stop_and_reply, normal, {reply, From, {error, Error}}} end; init({call, From}, Msg, State, Connection) -> handle_call(Msg, From, init, State, Connection); init(_Type, _Event, _State, _Connection) -> {keep_state_and_data, [postpone]}. %%-------------------------------------------------------------------- -spec hello(gen_statem:event_type(), #hello_request{} | #server_hello{} | term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- hello({call, From}, Msg, State, Connection) -> handle_call(Msg, From, hello, State, Connection); hello(internal, {common_client_hello, Type, ServerHelloExt}, State, Connection) -> do_server_hello(Type, ServerHelloExt, State, Connection); hello(info, Msg, State, _) -> handle_info(Msg, hello, State); hello(Type, Msg, State, Connection) -> handle_common_event(Type, Msg, hello, State, Connection). %%-------------------------------------------------------------------- -spec abbreviated(gen_statem:event_type(), #hello_request{} | #finished{} | term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- abbreviated({call, From}, Msg, State, Connection) -> handle_call(Msg, From, abbreviated, State, Connection); abbreviated(internal, #finished{verify_data = Data} = Finished, #state{role = server, negotiated_version = Version, expecting_finished = true, tls_handshake_history = Handshake, session = #session{master_secret = MasterSecret}, connection_states = ConnectionStates0} = State0, Connection) -> case ssl_handshake:verify_connection(ssl:tls_version(Version), Finished, client, get_current_prf(ConnectionStates0, write), MasterSecret, Handshake) of verified -> ConnectionStates = ssl_record:set_client_verify_data(current_both, Data, ConnectionStates0), {Record, State} = prepare_connection(State0#state{connection_states = ConnectionStates, expecting_finished = false}, Connection), Connection:next_event(connection, Record, State); #alert{} = Alert -> handle_own_alert(Alert, Version, abbreviated, State0) end; abbreviated(internal, #finished{verify_data = Data} = Finished, #state{role = client, tls_handshake_history = Handshake0, session = #session{master_secret = MasterSecret}, negotiated_version = Version, connection_states = ConnectionStates0} = State0, Connection) -> case ssl_handshake:verify_connection(ssl:tls_version(Version), Finished, server, get_pending_prf(ConnectionStates0, write), MasterSecret, Handshake0) of verified -> ConnectionStates1 = ssl_record:set_server_verify_data(current_read, Data, ConnectionStates0), {State1, Actions} = finalize_handshake(State0#state{connection_states = ConnectionStates1}, abbreviated, Connection), {Record, State} = prepare_connection(State1#state{expecting_finished = false}, Connection), Connection:next_event(connection, Record, State, Actions); #alert{} = Alert -> handle_own_alert(Alert, Version, abbreviated, State0) end; %% only allowed to send next_protocol message after change cipher spec %% & before finished message and it is not allowed during renegotiation abbreviated(internal, #next_protocol{selected_protocol = SelectedProtocol}, #state{role = server, expecting_next_protocol_negotiation = true} = State0, Connection) -> {Record, State} = Connection:next_record(State0#state{negotiated_protocol = SelectedProtocol}), Connection:next_event(abbreviated, Record, State#state{expecting_next_protocol_negotiation = false}); abbreviated(internal, #change_cipher_spec{type = <<1>>}, #state{connection_states = ConnectionStates0} = State0, Connection) -> ConnectionStates1 = ssl_record:activate_pending_connection_state(ConnectionStates0, read), {Record, State} = Connection:next_record(State0#state{connection_states = ConnectionStates1}), Connection:next_event(abbreviated, Record, State#state{expecting_finished = true}); abbreviated(info, Msg, State, _) -> handle_info(Msg, abbreviated, State); abbreviated(Type, Msg, State, Connection) -> handle_common_event(Type, Msg, abbreviated, State, Connection). %%-------------------------------------------------------------------- -spec certify(gen_statem:event_type(), #hello_request{} | #certificate{} | #server_key_exchange{} | #certificate_request{} | #server_hello_done{} | #client_key_exchange{} | term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- certify({call, From}, Msg, State, Connection) -> handle_call(Msg, From, certify, State, Connection); certify(info, Msg, State, _) -> handle_info(Msg, certify, State); certify(internal, #certificate{asn1_certificates = []}, #state{role = server, negotiated_version = Version, ssl_options = #ssl_options{verify = verify_peer, fail_if_no_peer_cert = true}} = State, _) -> Alert = ?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE), handle_own_alert(Alert, Version, certify, State); certify(internal, #certificate{asn1_certificates = []}, #state{role = server, ssl_options = #ssl_options{verify = verify_peer, fail_if_no_peer_cert = false}} = State0, Connection) -> {Record, State} = Connection:next_record(State0#state{client_certificate_requested = false}), Connection:next_event(certify, Record, State); certify(internal, #certificate{}, #state{role = server, negotiated_version = Version, ssl_options = #ssl_options{verify = verify_none}} = State, _) -> Alert = ?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE, unrequested_certificate), handle_own_alert(Alert, Version, certify, State); certify(internal, #certificate{} = Cert, #state{negotiated_version = Version, role = Role, cert_db = CertDbHandle, cert_db_ref = CertDbRef, crl_db = CRLDbInfo, ssl_options = Opts} = State, Connection) -> case ssl_handshake:certify(Cert, CertDbHandle, CertDbRef, Opts#ssl_options.depth, Opts#ssl_options.verify, Opts#ssl_options.verify_fun, Opts#ssl_options.partial_chain, Opts#ssl_options.crl_check, CRLDbInfo, Role) of {PeerCert, PublicKeyInfo} -> handle_peer_cert(Role, PeerCert, PublicKeyInfo, State#state{client_certificate_requested = false}, Connection); #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State) end; certify(internal, #server_key_exchange{exchange_keys = Keys}, #state{role = client, negotiated_version = Version, key_algorithm = Alg, public_key_info = PubKeyInfo, connection_states = ConnectionStates} = State, Connection) when Alg == dhe_dss; Alg == dhe_rsa; Alg == ecdhe_rsa; Alg == ecdhe_ecdsa; Alg == dh_anon; Alg == ecdh_anon; Alg == psk; Alg == dhe_psk; Alg == rsa_psk; Alg == srp_dss; Alg == srp_rsa; Alg == srp_anon -> Params = ssl_handshake:decode_server_key(Keys, Alg, ssl:tls_version(Version)), %% Use negotiated value if TLS-1.2 otherwhise return default HashSign = negotiated_hashsign(Params#server_key_params.hashsign, Alg, PubKeyInfo, ssl:tls_version(Version)), case is_anonymous(Alg) of true -> calculate_secret(Params#server_key_params.params, State#state{hashsign_algorithm = HashSign}, Connection); false -> case ssl_handshake:verify_server_key(Params, HashSign, ConnectionStates, ssl:tls_version(Version), PubKeyInfo) of true -> calculate_secret(Params#server_key_params.params, State#state{hashsign_algorithm = HashSign}, Connection); false -> handle_own_alert(?ALERT_REC(?FATAL, ?DECRYPT_ERROR), Version, certify, State) end end; certify(internal, #certificate_request{} = CertRequest, #state{session = #session{own_certificate = Cert}, role = client, ssl_options = #ssl_options{signature_algs = SupportedHashSigns}, negotiated_version = Version} = State0, Connection) -> case ssl_handshake:select_hashsign(CertRequest, Cert, SupportedHashSigns, ssl:tls_version(Version)) of #alert {} = Alert -> handle_own_alert(Alert, Version, certify, State0); NegotiatedHashSign -> {Record, State} = Connection:next_record(State0#state{client_certificate_requested = true}), Connection:next_event(certify, Record, State#state{cert_hashsign_algorithm = NegotiatedHashSign}) end; %% PSK and RSA_PSK might bypass the Server-Key-Exchange certify(internal, #server_hello_done{}, #state{session = #session{master_secret = undefined}, negotiated_version = Version, psk_identity = PSKIdentity, ssl_options = #ssl_options{user_lookup_fun = PSKLookup}, premaster_secret = undefined, role = client, key_algorithm = Alg} = State0, Connection) when Alg == psk -> case ssl_handshake:premaster_secret({Alg, PSKIdentity}, PSKLookup) of #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0); PremasterSecret -> State = master_secret(PremasterSecret, State0#state{premaster_secret = PremasterSecret}), client_certify_and_key_exchange(State, Connection) end; certify(internal, #server_hello_done{}, #state{session = #session{master_secret = undefined}, ssl_options = #ssl_options{user_lookup_fun = PSKLookup}, negotiated_version = {Major, Minor} = Version, psk_identity = PSKIdentity, premaster_secret = undefined, role = client, key_algorithm = Alg} = State0, Connection) when Alg == rsa_psk -> Rand = ssl_cipher:random_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2), RSAPremasterSecret = <>, case ssl_handshake:premaster_secret({Alg, PSKIdentity}, PSKLookup, RSAPremasterSecret) of #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0); PremasterSecret -> State = master_secret(PremasterSecret, State0#state{premaster_secret = RSAPremasterSecret}), client_certify_and_key_exchange(State, Connection) end; %% Master secret was determined with help of server-key exchange msg certify(internal, #server_hello_done{}, #state{session = #session{master_secret = MasterSecret} = Session, connection_states = ConnectionStates0, negotiated_version = Version, premaster_secret = undefined, role = client} = State0, Connection) -> case ssl_handshake:master_secret(ssl:tls_version(Version), Session, ConnectionStates0, client) of {MasterSecret, ConnectionStates} -> State = State0#state{connection_states = ConnectionStates}, client_certify_and_key_exchange(State, Connection); #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0) end; %% Master secret is calculated from premaster_secret certify(internal, #server_hello_done{}, #state{session = Session0, connection_states = ConnectionStates0, negotiated_version = Version, premaster_secret = PremasterSecret, role = client} = State0, Connection) -> case ssl_handshake:master_secret(ssl:tls_version(Version), PremasterSecret, ConnectionStates0, client) of {MasterSecret, ConnectionStates} -> Session = Session0#session{master_secret = MasterSecret}, State = State0#state{connection_states = ConnectionStates, session = Session}, client_certify_and_key_exchange(State, Connection); #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0) end; certify(internal = Type, #client_key_exchange{} = Msg, #state{role = server, client_certificate_requested = true, ssl_options = #ssl_options{fail_if_no_peer_cert = true}} = State, Connection) -> %% We expect a certificate here handle_common_event(Type, Msg, certify, State, Connection); certify(internal, #client_key_exchange{exchange_keys = Keys}, State = #state{key_algorithm = KeyAlg, negotiated_version = Version}, Connection) -> try certify_client_key_exchange(ssl_handshake:decode_client_key(Keys, KeyAlg, ssl:tls_version(Version)), State, Connection) catch #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State) end; certify(Type, Msg, State, Connection) -> handle_common_event(Type, Msg, certify, State, Connection). %%-------------------------------------------------------------------- -spec cipher(gen_statem:event_type(), #hello_request{} | #certificate_verify{} | #finished{} | term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- cipher({call, From}, Msg, State, Connection) -> handle_call(Msg, From, cipher, State, Connection); cipher(info, Msg, State, _) -> handle_info(Msg, cipher, State); cipher(internal, #certificate_verify{signature = Signature, hashsign_algorithm = CertHashSign}, #state{role = server, key_algorithm = KexAlg, public_key_info = PublicKeyInfo, negotiated_version = Version, session = #session{master_secret = MasterSecret}, tls_handshake_history = Handshake } = State0, Connection) -> %% Use negotiated value if TLS-1.2 otherwhise return default HashSign = negotiated_hashsign(CertHashSign, KexAlg, PublicKeyInfo, Version), case ssl_handshake:certificate_verify(Signature, PublicKeyInfo, ssl:tls_version(Version), HashSign, MasterSecret, Handshake) of valid -> {Record, State} = Connection:next_record(State0), Connection:next_event(cipher, Record, State#state{cert_hashsign_algorithm = HashSign}); #alert{} = Alert -> handle_own_alert(Alert, Version, cipher, State0) end; %% client must send a next protocol message if we are expecting it cipher(internal, #finished{}, #state{role = server, expecting_next_protocol_negotiation = true, negotiated_protocol = undefined, negotiated_version = Version} = State0, _Connection) -> handle_own_alert(?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE), Version, cipher, State0); cipher(internal, #finished{verify_data = Data} = Finished, #state{negotiated_version = Version, host = Host, port = Port, role = Role, expecting_finished = true, session = #session{master_secret = MasterSecret} = Session0, connection_states = ConnectionStates0, tls_handshake_history = Handshake0} = State, Connection) -> case ssl_handshake:verify_connection(ssl:tls_version(Version), Finished, opposite_role(Role), get_current_prf(ConnectionStates0, read), MasterSecret, Handshake0) of verified -> Session = register_session(Role, Host, Port, Session0), cipher_role(Role, Data, Session, State#state{expecting_finished = false}, Connection); #alert{} = Alert -> handle_own_alert(Alert, Version, cipher, State) end; %% only allowed to send next_protocol message after change cipher spec %% & before finished message and it is not allowed during renegotiation cipher(internal, #next_protocol{selected_protocol = SelectedProtocol}, #state{role = server, expecting_next_protocol_negotiation = true, expecting_finished = true} = State0, Connection) -> {Record, State} = Connection:next_record(State0#state{negotiated_protocol = SelectedProtocol}), Connection:next_event(cipher, Record, State#state{expecting_next_protocol_negotiation = false}); cipher(internal, #change_cipher_spec{type = <<1>>}, #state{connection_states = ConnectionStates0} = State0, Connection) -> ConnectionStates1 = ssl_record:activate_pending_connection_state(ConnectionStates0, read), {Record, State} = Connection:next_record(State0#state{connection_states = ConnectionStates1}), Connection:next_event(cipher, Record, State#state{expecting_finished = true}); cipher(Type, Msg, State, Connection) -> handle_common_event(Type, Msg, cipher, State, Connection). %%-------------------------------------------------------------------- -spec connection(gen_statem:event_type(), term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- connection({call, From}, {application_data, Data}, #state{protocol_cb = Connection} = State, Connection) -> %% We should look into having a worker process to do this to %% parallize send and receive decoding and not block the receiver %% if sending is overloading the socket. try write_application_data(Data, From, State) catch throw:Error -> hibernate_after(connection, State, [{reply, From, Error}]) end; connection({call, RecvFrom}, {recv, N, Timeout}, #state{protocol_cb = Connection, socket_options = #socket_options{active = false}} = State0, Connection) -> Timer = start_or_recv_cancel_timer(Timeout, RecvFrom), Connection:passive_receive(State0#state{bytes_to_read = N, start_or_recv_from = RecvFrom, timer = Timer}, connection); connection({call, From}, renegotiate, #state{protocol_cb = Connection} = State, Connection) -> Connection:renegotiate(State#state{renegotiation = {true, From}}, []); connection({call, From}, peer_certificate, #state{session = #session{peer_certificate = Cert}} = State, _) -> hibernate_after(connection, State, [{reply, From, {ok, Cert}}]); connection({call, From}, connection_information, State, _) -> Info = connection_info(State), hibernate_after(connection, State, [{reply, From, {ok, Info}}]); connection({call, From}, session_info, #state{session = #session{session_id = Id, cipher_suite = Suite}} = State, _) -> SessionInfo = [{session_id, Id}, {cipher_suite, ssl_cipher:erl_suite_definition(Suite)}], hibernate_after(connection, State, [{reply, From, SessionInfo}]); connection({call, From}, negotiated_protocol, #state{negotiated_protocol = undefined} = State, _) -> hibernate_after(connection, State, [{reply, From, {error, protocol_not_negotiated}}]); connection({call, From}, negotiated_protocol, #state{negotiated_protocol = SelectedProtocol} = State, _) -> hibernate_after(connection, State, [{reply, From, {ok, SelectedProtocol}}]); connection({call, From}, Msg, State, Connection) -> handle_call(Msg, From, connection, State, Connection); connection(info, Msg, State, _) -> handle_info(Msg, connection, State); connection(internal, {recv, _}, State, Connection) -> Connection:passive_receive(State, connection); connection(Type, Msg, State, Connection) -> handle_common_event(Type, Msg, connection, State, Connection). %%-------------------------------------------------------------------- -spec downgrade(gen_statem:event_type(), term(), #state{}, tls_connection | dtls_connection) -> gen_statem:state_function_result(). %%-------------------------------------------------------------------- downgrade(internal, #alert{description = ?CLOSE_NOTIFY}, #state{transport_cb = Transport, socket = Socket, downgrade = {Pid, From}} = State, _) -> tls_socket:setopts(Transport, Socket, [{active, false}, {packet, 0}, {mode, binary}]), Transport:controlling_process(Socket, Pid), gen_statem:reply(From, {ok, Socket}), {stop, normal, State}; downgrade(timeout, downgrade, #state{downgrade = {_, From}} = State, _) -> gen_statem:reply(From, {error, timeout}), {stop, normal, State}; downgrade(Type, Event, State, Connection) -> handle_common_event(Type, Event, downgrade, State, Connection). %%-------------------------------------------------------------------- %% Event handling functions called by state functions to handle %% common or unexpected events for the state. %%-------------------------------------------------------------------- handle_common_event(internal, {handshake, {#hello_request{} = Handshake, _}}, connection = StateName, #state{role = client} = State, _) -> %% Should not be included in handshake history {next_state, StateName, State#state{renegotiation = {true, peer}}, [{next_event, internal, Handshake}]}; handle_common_event(internal, {handshake, {#hello_request{}, _}}, StateName, #state{role = client}, _) when StateName =/= connection -> {keep_state_and_data}; handle_common_event(internal, {handshake, {Handshake, Raw}}, StateName, #state{tls_handshake_history = Hs0, ssl_options = #ssl_options{v2_hello_compatible = V2HComp}} = State0, Connection) -> PossibleSNI = Connection:select_sni_extension(Handshake), %% This function handles client SNI hello extension when Handshake is %% a client_hello, which needs to be determined by the connection callback. %% In other cases this is a noop State = handle_sni_extension(PossibleSNI, State0), HsHist = ssl_handshake:update_handshake_history(Hs0, iolist_to_binary(Raw), V2HComp), {next_state, StateName, State#state{tls_handshake_history = HsHist}, [{next_event, internal, Handshake}]}; handle_common_event(internal, {protocol_record, TLSorDTLSRecord}, StateName, State, Connection) -> Connection:handle_common_event(internal, TLSorDTLSRecord, StateName, State); handle_common_event(timeout, hibernate, _, _, _) -> {keep_state_and_data, [hibernate]}; handle_common_event(internal, {application_data, Data}, StateName, State0, Connection) -> case read_application_data(Data, State0) of {stop, Reason, State} -> {stop, Reason, State}; {Record, State} -> Connection:next_event(StateName, Record, State) end; handle_common_event(internal, #change_cipher_spec{type = <<1>>}, StateName, #state{negotiated_version = Version} = State, _) -> handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE), Version, StateName, State); handle_common_event(_Type, Msg, StateName, #state{negotiated_version = Version} = State, _) -> Alert = ?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE), handle_own_alert(Alert, Version, {StateName, Msg}, State). handle_call({application_data, _Data}, _, _, _, _) -> %% In renegotiation priorities handshake, send data when handshake is finished {keep_state_and_data, [postpone]}; handle_call({close, {Pid, Timeout}}, From, StateName, State0, Connection) when is_pid(Pid) -> %% terminate will send close alert to peer State = State0#state{downgrade = {Pid, From}}, Connection:terminate(downgrade, StateName, State), %% User downgrades connection %% When downgrading an TLS connection to a transport connection %% we must recive the close alert from the peer before releasing the %% transport socket. {next_state, downgrade, State#state{terminated = true}, [{timeout, Timeout, downgrade}]}; handle_call({close, _} = Close, From, StateName, State, Connection) -> %% Run terminate before returning so that the reuseaddr %% inet-option works properly Result = Connection:terminate(Close, StateName, State#state{terminated = true}), {stop_and_reply, {shutdown, normal}, {reply, From, Result}, State}; handle_call({shutdown, How0}, From, _, #state{transport_cb = Transport, negotiated_version = Version, connection_states = ConnectionStates, socket = Socket}, Connection) -> case How0 of How when How == write; How == both -> Alert = ?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), {BinMsg, _} = Connection:encode_alert(Alert, Version, ConnectionStates), Connection:send(Transport, Socket, BinMsg); _ -> ok end, case Transport:shutdown(Socket, How0) of ok -> {keep_state_and_data, [{reply, From, ok}]}; Error -> gen_statem:reply(From, {error, Error}), {stop, normal} end; handle_call({recv, _N, _Timeout}, From, _, #state{socket_options = #socket_options{active = Active}}, _) when Active =/= false -> {keep_state_and_data, [{reply, From, {error, einval}}]}; handle_call({recv, N, Timeout}, RecvFrom, StateName, State, _) -> %% Doing renegotiate wait with handling request until renegotiate is %% finished. Timer = start_or_recv_cancel_timer(Timeout, RecvFrom), {next_state, StateName, State#state{bytes_to_read = N, start_or_recv_from = RecvFrom, timer = Timer}, [{next_event, internal, {recv, RecvFrom}}]}; handle_call({new_user, User}, From, StateName, State =#state{user_application = {OldMon, _}}, _) -> NewMon = erlang:monitor(process, User), erlang:demonitor(OldMon, [flush]), {next_state, StateName, State#state{user_application = {NewMon,User}}, [{reply, From, ok}]}; handle_call({get_opts, OptTags}, From, _, #state{socket = Socket, transport_cb = Transport, socket_options = SockOpts}, _) -> OptsReply = get_socket_opts(Transport, Socket, OptTags, SockOpts, []), {keep_state_and_data, [{reply, From, OptsReply}]}; handle_call({set_opts, Opts0}, From, StateName, #state{socket_options = Opts1, socket = Socket, transport_cb = Transport} = State0, _) -> {Reply, Opts} = set_socket_opts(Transport, Socket, Opts0, Opts1, []), State = State0#state{socket_options = Opts}, handle_active_option(Opts#socket_options.active, StateName, From, Reply, State); handle_call(renegotiate, From, StateName, _, _) when StateName =/= connection -> {keep_state_and_data, [{reply, From, {error, already_renegotiating}}]}; handle_call({prf, Secret, Label, Seed, WantedLength}, From, _, #state{connection_states = ConnectionStates, negotiated_version = Version}, _) -> #{security_parameters := SecParams} = ssl_record:current_connection_state(ConnectionStates, read), #security_parameters{master_secret = MasterSecret, client_random = ClientRandom, server_random = ServerRandom, prf_algorithm = PRFAlgorithm} = SecParams, Reply = try SecretToUse = case Secret of _ when is_binary(Secret) -> Secret; master_secret -> MasterSecret end, SeedToUse = lists:reverse( lists:foldl(fun(X, Acc) when is_binary(X) -> [X|Acc]; (client_random, Acc) -> [ClientRandom|Acc]; (server_random, Acc) -> [ServerRandom|Acc] end, [], Seed)), ssl_handshake:prf(ssl:tls_version(Version), PRFAlgorithm, SecretToUse, Label, SeedToUse, WantedLength) catch exit:_ -> {error, badarg}; error:Reason -> {error, Reason} end, {keep_state_and_data, [{reply, From, Reply}]}; handle_call(_,_,_,_,_) -> {keep_state_and_data, [postpone]}. handle_info({ErrorTag, Socket, econnaborted}, StateName, #state{socket = Socket, transport_cb = Transport, protocol_cb = Connection, start_or_recv_from = StartFrom, role = Role, error_tag = ErrorTag, tracker = Tracker} = State) when StateName =/= connection -> alert_user(Transport, Tracker,Socket, StartFrom, ?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), Role, Connection), {stop, normal, State}; handle_info({ErrorTag, Socket, Reason}, StateName, #state{socket = Socket, error_tag = ErrorTag} = State) -> Report = io_lib:format("SSL: Socket error: ~p ~n", [Reason]), error_logger:info_report(Report), handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State), {stop, normal, State}; handle_info({'DOWN', MonitorRef, _, _, _}, _, State = #state{user_application={MonitorRef,_Pid}}) -> {stop, normal, State}; %%% So that terminate will be run when supervisor issues shutdown handle_info({'EXIT', _Sup, shutdown}, _StateName, State) -> {stop, shutdown, State}; handle_info({'EXIT', Socket, normal}, _StateName, #state{socket = Socket} = State) -> %% Handle as transport close" {stop, {shutdown, transport_closed}, State}; handle_info(allow_renegotiate, StateName, State) -> {next_state, StateName, State#state{allow_renegotiate = true}}; handle_info({cancel_start_or_recv, StartFrom}, StateName, #state{renegotiation = {false, first}} = State) when StateName =/= connection -> {stop_and_reply, {shutdown, user_timeout}, {reply, StartFrom, {error, timeout}}, State#state{timer = undefined}}; handle_info({cancel_start_or_recv, RecvFrom}, StateName, #state{start_or_recv_from = RecvFrom} = State) when RecvFrom =/= undefined -> {next_state, StateName, State#state{start_or_recv_from = undefined, bytes_to_read = undefined, timer = undefined}, [{reply, RecvFrom, {error, timeout}}]}; handle_info({cancel_start_or_recv, _RecvFrom}, StateName, State) -> {next_state, StateName, State#state{timer = undefined}}; handle_info(Msg, StateName, #state{socket = Socket, error_tag = Tag} = State) -> Report = io_lib:format("SSL: Got unexpected info: ~p ~n", [{Msg, Tag, Socket}]), error_logger:info_report(Report), {next_state, StateName, State}. %%-------------------------------------------------------------------- %% gen_statem callbacks %%-------------------------------------------------------------------- terminate(_, _, #state{terminated = true}) -> %% Happens when user closes the connection using ssl:close/1 %% we want to guarantee that Transport:close has been called %% when ssl:close/1 returns unless it is a downgrade where %% we want to guarantee that close alert is recived before %% returning. In both cases terminate has been run manually %% before run by gen_statem which will end up here ok; terminate({shutdown, transport_closed} = Reason, _StateName, #state{protocol_cb = Connection, socket = Socket, transport_cb = Transport} = State) -> handle_trusted_certs_db(State), Connection:close(Reason, Socket, Transport, undefined, undefined); terminate({shutdown, own_alert}, _StateName, #state{%%send_queue = SendQueue, protocol_cb = Connection, socket = Socket, transport_cb = Transport} = State) -> handle_trusted_certs_db(State), case application:get_env(ssl, alert_timeout) of {ok, Timeout} when is_integer(Timeout) -> Connection:close({timeout, Timeout}, Socket, Transport, undefined, undefined); _ -> Connection:close({timeout, ?DEFAULT_TIMEOUT}, Socket, Transport, undefined, undefined) end; terminate(Reason, connection, #state{negotiated_version = Version, protocol_cb = Connection, connection_states = ConnectionStates0, ssl_options = #ssl_options{padding_check = Check}, transport_cb = Transport, socket = Socket } = State) -> handle_trusted_certs_db(State), {BinAlert, ConnectionStates} = terminate_alert(Reason, Version, ConnectionStates0, Connection), Connection:send(Transport, Socket, BinAlert), Connection:close(Reason, Socket, Transport, ConnectionStates, Check); terminate(Reason, _StateName, #state{transport_cb = Transport, protocol_cb = Connection, socket = Socket } = State) -> handle_trusted_certs_db(State), Connection:close(Reason, Socket, Transport, undefined, undefined). format_status(normal, [_, StateName, State]) -> [{data, [{"State", {StateName, State}}]}]; format_status(terminate, [_, StateName, State]) -> SslOptions = (State#state.ssl_options), NewOptions = SslOptions#ssl_options{password = ?SECRET_PRINTOUT, cert = ?SECRET_PRINTOUT, cacerts = ?SECRET_PRINTOUT, key = ?SECRET_PRINTOUT, dh = ?SECRET_PRINTOUT, psk_identity = ?SECRET_PRINTOUT, srp_identity = ?SECRET_PRINTOUT}, [{data, [{"State", {StateName, State#state{connection_states = ?SECRET_PRINTOUT, protocol_buffers = ?SECRET_PRINTOUT, user_data_buffer = ?SECRET_PRINTOUT, tls_handshake_history = ?SECRET_PRINTOUT, session = ?SECRET_PRINTOUT, private_key = ?SECRET_PRINTOUT, diffie_hellman_params = ?SECRET_PRINTOUT, diffie_hellman_keys = ?SECRET_PRINTOUT, srp_params = ?SECRET_PRINTOUT, srp_keys = ?SECRET_PRINTOUT, premaster_secret = ?SECRET_PRINTOUT, ssl_options = NewOptions, flight_buffer = ?SECRET_PRINTOUT} }}]}]. %%-------------------------------------------------------------------- %%% %%-------------------------------------------------------------------- write_application_data(Data0, From, #state{socket = Socket, negotiated_version = Version, protocol_cb = Connection, transport_cb = Transport, connection_states = ConnectionStates0, socket_options = SockOpts, ssl_options = #ssl_options{renegotiate_at = RenegotiateAt}} = State) -> Data = encode_packet(Data0, SockOpts), case time_to_renegotiate(Data, ConnectionStates0, RenegotiateAt) of true -> Connection:renegotiate(State#state{renegotiation = {true, internal}}, [{next_event, {call, From}, {application_data, Data0}}]); false -> {Msgs, ConnectionStates} = Connection:encode_data(Data, Version, ConnectionStates0), Result = Connection:send(Transport, Socket, Msgs), ssl_connection:hibernate_after(connection, State#state{connection_states = ConnectionStates}, [{reply, From, Result}]) end. read_application_data(Data, #state{user_application = {_Mon, Pid}, socket = Socket, protocol_cb = Connection, transport_cb = Transport, socket_options = SOpts, bytes_to_read = BytesToRead, start_or_recv_from = RecvFrom, timer = Timer, user_data_buffer = Buffer0, tracker = Tracker} = State0) -> Buffer1 = if Buffer0 =:= <<>> -> Data; Data =:= <<>> -> Buffer0; true -> <> end, case get_data(SOpts, BytesToRead, Buffer1) of {ok, ClientData, Buffer} -> % Send data SocketOpt = deliver_app_data(Transport, Socket, SOpts, ClientData, Pid, RecvFrom, Tracker, Connection), cancel_timer(Timer), State = State0#state{user_data_buffer = Buffer, start_or_recv_from = undefined, timer = undefined, bytes_to_read = undefined, socket_options = SocketOpt }, if SocketOpt#socket_options.active =:= false; Buffer =:= <<>> -> %% Passive mode, wait for active once or recv %% Active and empty, get more data Connection:next_record_if_active(State); true -> %% We have more data read_application_data(<<>>, State) end; {more, Buffer} -> % no reply, we need more data Connection:next_record(State0#state{user_data_buffer = Buffer}); {passive, Buffer} -> Connection:next_record_if_active(State0#state{user_data_buffer = Buffer}); {error,_Reason} -> %% Invalid packet in packet mode deliver_packet_error(Transport, Socket, SOpts, Buffer1, Pid, RecvFrom, Tracker, Connection), {stop, normal, State0} end. %%-------------------------------------------------------------------- %%% %%-------------------------------------------------------------------- handle_alert(#alert{level = ?FATAL} = Alert, StateName, #state{socket = Socket, transport_cb = Transport, protocol_cb = Connection, ssl_options = SslOpts, start_or_recv_from = From, host = Host, port = Port, session = Session, user_application = {_Mon, Pid}, role = Role, socket_options = Opts, tracker = Tracker}) -> invalidate_session(Role, Host, Port, Session), log_alert(SslOpts#ssl_options.log_alert, StateName, Alert), alert_user(Transport, Tracker, Socket, StateName, Opts, Pid, From, Alert, Role, Connection), {stop, normal}; handle_alert(#alert{level = ?WARNING, description = ?CLOSE_NOTIFY} = Alert, StateName, State) -> handle_normal_shutdown(Alert, StateName, State), {stop, {shutdown, peer_close}}; handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName, #state{ssl_options = SslOpts, renegotiation = {true, internal}} = State) -> log_alert(SslOpts#ssl_options.log_alert, StateName, Alert), handle_normal_shutdown(Alert, StateName, State), {stop, {shutdown, peer_close}}; handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName, #state{ssl_options = SslOpts, renegotiation = {true, From}, protocol_cb = Connection} = State0) -> log_alert(SslOpts#ssl_options.log_alert, StateName, Alert), gen_statem:reply(From, {error, renegotiation_rejected}), {Record, State} = Connection:next_record(State0), %% Go back to connection! Connection:next_event(connection, Record, State); %% Gracefully log and ignore all other warning alerts handle_alert(#alert{level = ?WARNING} = Alert, StateName, #state{ssl_options = SslOpts, protocol_cb = Connection} = State0) -> log_alert(SslOpts#ssl_options.log_alert, StateName, Alert), {Record, State} = Connection:next_record(State0), Connection:next_event(StateName, Record, State). %%-------------------------------------------------------------------- %%% Internal functions %%-------------------------------------------------------------------- connection_info(#state{sni_hostname = SNIHostname, session = #session{cipher_suite = CipherSuite, ecc = ECCCurve}, protocol_cb = Connection, negotiated_version = {_,_} = Version, ssl_options = Opts}) -> RecordCB = record_cb(Connection), CipherSuiteDef = ssl_cipher:erl_suite_definition(CipherSuite), IsNamedCurveSuite = lists:member(element(1,CipherSuiteDef), [ecdh_ecdsa, ecdhe_ecdsa, ecdh_anon]), CurveInfo = case ECCCurve of {namedCurve, Curve} when IsNamedCurveSuite -> [{ecc, {named_curve, pubkey_cert_records:namedCurves(Curve)}}]; _ -> [] end, [{protocol, RecordCB:protocol_version(Version)}, {cipher_suite, CipherSuiteDef}, {sni_hostname, SNIHostname} | CurveInfo] ++ ssl_options_list(Opts). do_server_hello(Type, #hello_extensions{next_protocol_negotiation = NextProtocols} = ServerHelloExt, #state{negotiated_version = Version, session = #session{session_id = SessId}, connection_states = ConnectionStates0} = State0, Connection) when is_atom(Type) -> ServerHello = ssl_handshake:server_hello(SessId, ssl:tls_version(Version), ConnectionStates0, ServerHelloExt), State = server_hello(ServerHello, State0#state{expecting_next_protocol_negotiation = NextProtocols =/= undefined}, Connection), case Type of new -> new_server_hello(ServerHello, State, Connection); resumed -> resumed_server_hello(State, Connection) end. new_server_hello(#server_hello{cipher_suite = CipherSuite, compression_method = Compression, session_id = SessionId}, #state{session = Session0, negotiated_version = Version} = State0, Connection) -> try server_certify_and_key_exchange(State0, Connection) of #state{} = State1 -> {State2, Actions} = server_hello_done(State1, Connection), Session = Session0#session{session_id = SessionId, cipher_suite = CipherSuite, compression_method = Compression}, {Record, State} = Connection:next_record(State2#state{session = Session}), Connection:next_event(certify, Record, State, Actions) catch #alert{} = Alert -> handle_own_alert(Alert, Version, hello, State0) end. resumed_server_hello(#state{session = Session, connection_states = ConnectionStates0, negotiated_version = Version} = State0, Connection) -> case ssl_handshake:master_secret(ssl:tls_version(Version), Session, ConnectionStates0, server) of {_, ConnectionStates1} -> State1 = State0#state{connection_states = ConnectionStates1, session = Session}, {State2, Actions} = finalize_handshake(State1, abbreviated, Connection), {Record, State} = Connection:next_record(State2), Connection:next_event(abbreviated, Record, State, Actions); #alert{} = Alert -> handle_own_alert(Alert, Version, hello, State0) end. server_hello(ServerHello, State0, Connection) -> CipherSuite = ServerHello#server_hello.cipher_suite, {KeyAlgorithm, _, _, _} = ssl_cipher:suite_definition(CipherSuite), State = Connection:queue_handshake(ServerHello, State0), State#state{key_algorithm = KeyAlgorithm}. server_hello_done(State, Connection) -> HelloDone = ssl_handshake:server_hello_done(), Connection:send_handshake(HelloDone, State). handle_peer_cert(Role, PeerCert, PublicKeyInfo, #state{session = #session{cipher_suite = CipherSuite} = Session} = State0, Connection) -> State1 = State0#state{session = Session#session{peer_certificate = PeerCert}, public_key_info = PublicKeyInfo}, {KeyAlg,_,_,_} = ssl_cipher:suite_definition(CipherSuite), State2 = handle_peer_cert_key(Role, PeerCert, PublicKeyInfo, KeyAlg, State1), {Record, State} = Connection:next_record(State2), Connection:next_event(certify, Record, State). handle_peer_cert_key(client, _, {?'id-ecPublicKey', #'ECPoint'{point = _ECPoint} = PublicKey, PublicKeyParams}, KeyAlg, State) when KeyAlg == ecdh_rsa; KeyAlg == ecdh_ecdsa -> ECDHKey = public_key:generate_key(PublicKeyParams), PremasterSecret = ssl_handshake:premaster_secret(PublicKey, ECDHKey), master_secret(PremasterSecret, State#state{diffie_hellman_keys = ECDHKey}); %% We do currently not support cipher suites that use fixed DH. %% If we want to implement that the following clause can be used %% to extract DH parameters form cert. %% handle_peer_cert_key(client, _PeerCert, {?dhpublicnumber, PublicKey, PublicKeyParams}, %% {_,SignAlg}, %% #state{diffie_hellman_keys = {_, MyPrivatKey}} = State) when %% SignAlg == dh_rsa; %% SignAlg == dh_dss -> %% dh_master_secret(PublicKeyParams, PublicKey, MyPrivatKey, State); handle_peer_cert_key(_, _, _, _, State) -> State. certify_client(#state{client_certificate_requested = true, role = client, cert_db = CertDbHandle, cert_db_ref = CertDbRef, session = #session{own_certificate = OwnCert}} = State, Connection) -> Certificate = ssl_handshake:certificate(OwnCert, CertDbHandle, CertDbRef, client), Connection:queue_handshake(Certificate, State); certify_client(#state{client_certificate_requested = false} = State, _) -> State. verify_client_cert(#state{client_certificate_requested = true, role = client, negotiated_version = Version, private_key = PrivateKey, session = #session{master_secret = MasterSecret, own_certificate = OwnCert}, cert_hashsign_algorithm = HashSign, tls_handshake_history = Handshake0} = State, Connection) -> case ssl_handshake:client_certificate_verify(OwnCert, MasterSecret, ssl:tls_version(Version), HashSign, PrivateKey, Handshake0) of #certificate_verify{} = Verified -> Connection:queue_handshake(Verified, State); ignore -> State; #alert{} = Alert -> throw(Alert) end; verify_client_cert(#state{client_certificate_requested = false} = State, _) -> State. client_certify_and_key_exchange(#state{negotiated_version = Version} = State0, Connection) -> try do_client_certify_and_key_exchange(State0, Connection) of State1 = #state{} -> {State2, Actions} = finalize_handshake(State1, certify, Connection), State3 = State2#state{ %% Reinitialize client_certificate_requested = false}, {Record, State} = Connection:next_record(State3), Connection:next_event(cipher, Record, State, Actions) catch throw:#alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0) end. do_client_certify_and_key_exchange(State0, Connection) -> State1 = certify_client(State0, Connection), State2 = key_exchange(State1, Connection), verify_client_cert(State2, Connection). server_certify_and_key_exchange(State0, Connection) -> State1 = certify_server(State0, Connection), State2 = key_exchange(State1, Connection), request_client_cert(State2, Connection). certify_client_key_exchange(#encrypted_premaster_secret{premaster_secret= EncPMS}, #state{private_key = Key, client_hello_version = {Major, Minor} = Version} = State, Connection) -> %% Countermeasure for Bleichenbacher attack always provide some kind of premaster secret %% and fail handshake later.RFC 5246 section 7.4.7.1. PremasterSecret = try ssl_handshake:premaster_secret(EncPMS, Key) of Secret when erlang:byte_size(Secret) == ?NUM_OF_PREMASTERSECRET_BYTES -> case Secret of <> -> %% Correct Secret; <> -> %% Version mismatch <> end; _ -> %% erlang:byte_size(Secret) =/= ?NUM_OF_PREMASTERSECRET_BYTES make_premaster_secret(Version, rsa) catch #alert{description = ?DECRYPT_ERROR} -> make_premaster_secret(Version, rsa) end, calculate_master_secret(PremasterSecret, State, Connection, certify, cipher); certify_client_key_exchange(#client_diffie_hellman_public{dh_public = ClientPublicDhKey}, #state{diffie_hellman_params = #'DHParameter'{} = Params, diffie_hellman_keys = {_, ServerDhPrivateKey}} = State, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(ClientPublicDhKey, ServerDhPrivateKey, Params), calculate_master_secret(PremasterSecret, State, Connection, certify, cipher); certify_client_key_exchange(#client_ec_diffie_hellman_public{dh_public = ClientPublicEcDhPoint}, #state{diffie_hellman_keys = ECDHKey} = State, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(#'ECPoint'{point = ClientPublicEcDhPoint}, ECDHKey), calculate_master_secret(PremasterSecret, State, Connection, certify, cipher); certify_client_key_exchange(#client_psk_identity{} = ClientKey, #state{ssl_options = #ssl_options{user_lookup_fun = PSKLookup}} = State0, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(ClientKey, PSKLookup), calculate_master_secret(PremasterSecret, State0, Connection, certify, cipher); certify_client_key_exchange(#client_dhe_psk_identity{} = ClientKey, #state{diffie_hellman_params = #'DHParameter'{} = Params, diffie_hellman_keys = {_, ServerDhPrivateKey}, ssl_options = #ssl_options{user_lookup_fun = PSKLookup}} = State0, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(ClientKey, ServerDhPrivateKey, Params, PSKLookup), calculate_master_secret(PremasterSecret, State0, Connection, certify, cipher); certify_client_key_exchange(#client_rsa_psk_identity{} = ClientKey, #state{private_key = Key, ssl_options = #ssl_options{user_lookup_fun = PSKLookup}} = State0, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(ClientKey, Key, PSKLookup), calculate_master_secret(PremasterSecret, State0, Connection, certify, cipher); certify_client_key_exchange(#client_srp_public{} = ClientKey, #state{srp_params = Params, srp_keys = Key } = State0, Connection) -> PremasterSecret = ssl_handshake:premaster_secret(ClientKey, Key, Params), calculate_master_secret(PremasterSecret, State0, Connection, certify, cipher). certify_server(#state{key_algorithm = Algo} = State, _) when Algo == dh_anon; Algo == ecdh_anon; Algo == psk; Algo == dhe_psk; Algo == srp_anon -> State; certify_server(#state{cert_db = CertDbHandle, cert_db_ref = CertDbRef, session = #session{own_certificate = OwnCert}} = State, Connection) -> case ssl_handshake:certificate(OwnCert, CertDbHandle, CertDbRef, server) of Cert = #certificate{} -> Connection:queue_handshake(Cert, State); Alert = #alert{} -> throw(Alert) end. key_exchange(#state{role = server, key_algorithm = rsa} = State,_) -> State; key_exchange(#state{role = server, key_algorithm = Algo, hashsign_algorithm = HashSignAlgo, diffie_hellman_params = #'DHParameter'{} = Params, private_key = PrivateKey, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) when Algo == dhe_dss; Algo == dhe_rsa; Algo == dh_anon -> DHKeys = public_key:generate_key(Params), #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {dh, DHKeys, Params, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), State = Connection:queue_handshake(Msg, State0), State#state{diffie_hellman_keys = DHKeys}; key_exchange(#state{role = server, private_key = Key, key_algorithm = Algo} = State, _) when Algo == ecdh_ecdsa; Algo == ecdh_rsa -> State#state{diffie_hellman_keys = Key}; key_exchange(#state{role = server, key_algorithm = Algo, hashsign_algorithm = HashSignAlgo, private_key = PrivateKey, session = #session{ecc = ECCCurve}, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) when Algo == ecdhe_ecdsa; Algo == ecdhe_rsa; Algo == ecdh_anon -> ECDHKeys = public_key:generate_key(ECCCurve), #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {ecdh, ECDHKeys, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), State = Connection:queue_handshake(Msg, State0), State#state{diffie_hellman_keys = ECDHKeys}; key_exchange(#state{role = server, key_algorithm = psk, ssl_options = #ssl_options{psk_identity = undefined}} = State, _) -> State; key_exchange(#state{role = server, key_algorithm = psk, ssl_options = #ssl_options{psk_identity = PskIdentityHint}, hashsign_algorithm = HashSignAlgo, private_key = PrivateKey, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) -> #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {psk, PskIdentityHint, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = server, key_algorithm = dhe_psk, ssl_options = #ssl_options{psk_identity = PskIdentityHint}, hashsign_algorithm = HashSignAlgo, diffie_hellman_params = #'DHParameter'{} = Params, private_key = PrivateKey, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) -> DHKeys = public_key:generate_key(Params), #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {dhe_psk, PskIdentityHint, DHKeys, Params, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), State = Connection:queue_handshake(Msg, State0), State#state{diffie_hellman_keys = DHKeys}; key_exchange(#state{role = server, key_algorithm = rsa_psk, ssl_options = #ssl_options{psk_identity = undefined}} = State, _) -> State; key_exchange(#state{role = server, key_algorithm = rsa_psk, ssl_options = #ssl_options{psk_identity = PskIdentityHint}, hashsign_algorithm = HashSignAlgo, private_key = PrivateKey, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) -> #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {psk, PskIdentityHint, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = server, key_algorithm = Algo, ssl_options = #ssl_options{user_lookup_fun = LookupFun}, hashsign_algorithm = HashSignAlgo, session = #session{srp_username = Username}, private_key = PrivateKey, connection_states = ConnectionStates0, negotiated_version = Version } = State0, Connection) when Algo == srp_dss; Algo == srp_rsa; Algo == srp_anon -> SrpParams = handle_srp_identity(Username, LookupFun), Keys = case generate_srp_server_keys(SrpParams, 0) of Alert = #alert{} -> throw(Alert); Keys0 = {_,_} -> Keys0 end, #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates0, read), #security_parameters{client_random = ClientRandom, server_random = ServerRandom} = SecParams, Msg = ssl_handshake:key_exchange(server, ssl:tls_version(Version), {srp, Keys, SrpParams, HashSignAlgo, ClientRandom, ServerRandom, PrivateKey}), State = Connection:queue_handshake(Msg, State0), State#state{srp_params = SrpParams, srp_keys = Keys}; key_exchange(#state{role = client, key_algorithm = rsa, public_key_info = PublicKeyInfo, negotiated_version = Version, premaster_secret = PremasterSecret} = State0, Connection) -> Msg = rsa_key_exchange(ssl:tls_version(Version), PremasterSecret, PublicKeyInfo), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, key_algorithm = Algorithm, negotiated_version = Version, diffie_hellman_keys = {DhPubKey, _} } = State0, Connection) when Algorithm == dhe_dss; Algorithm == dhe_rsa; Algorithm == dh_anon -> Msg = ssl_handshake:key_exchange(client, ssl:tls_version(Version), {dh, DhPubKey}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, key_algorithm = Algorithm, negotiated_version = Version, diffie_hellman_keys = Keys} = State0, Connection) when Algorithm == ecdhe_ecdsa; Algorithm == ecdhe_rsa; Algorithm == ecdh_ecdsa; Algorithm == ecdh_rsa; Algorithm == ecdh_anon -> Msg = ssl_handshake:key_exchange(client, ssl:tls_version(Version), {ecdh, Keys}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, ssl_options = SslOpts, key_algorithm = psk, negotiated_version = Version} = State0, Connection) -> Msg = ssl_handshake:key_exchange(client, ssl:tls_version(Version), {psk, SslOpts#ssl_options.psk_identity}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, ssl_options = SslOpts, key_algorithm = dhe_psk, negotiated_version = Version, diffie_hellman_keys = {DhPubKey, _}} = State0, Connection) -> Msg = ssl_handshake:key_exchange(client, ssl:tls_version(Version), {dhe_psk, SslOpts#ssl_options.psk_identity, DhPubKey}), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, ssl_options = SslOpts, key_algorithm = rsa_psk, public_key_info = PublicKeyInfo, negotiated_version = Version, premaster_secret = PremasterSecret} = State0, Connection) -> Msg = rsa_psk_key_exchange(ssl:tls_version(Version), SslOpts#ssl_options.psk_identity, PremasterSecret, PublicKeyInfo), Connection:queue_handshake(Msg, State0); key_exchange(#state{role = client, key_algorithm = Algorithm, negotiated_version = Version, srp_keys = {ClientPubKey, _}} = State0, Connection) when Algorithm == srp_dss; Algorithm == srp_rsa; Algorithm == srp_anon -> Msg = ssl_handshake:key_exchange(client, ssl:tls_version(Version), {srp, ClientPubKey}), Connection:queue_handshake(Msg, State0). rsa_key_exchange(Version, PremasterSecret, PublicKeyInfo = {Algorithm, _, _}) when Algorithm == ?rsaEncryption; Algorithm == ?md2WithRSAEncryption; Algorithm == ?md5WithRSAEncryption; Algorithm == ?sha1WithRSAEncryption; Algorithm == ?sha224WithRSAEncryption; Algorithm == ?sha256WithRSAEncryption; Algorithm == ?sha384WithRSAEncryption; Algorithm == ?sha512WithRSAEncryption -> ssl_handshake:key_exchange(client, ssl:tls_version(Version), {premaster_secret, PremasterSecret, PublicKeyInfo}); rsa_key_exchange(_, _, _) -> throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE, pub_key_is_not_rsa)). rsa_psk_key_exchange(Version, PskIdentity, PremasterSecret, PublicKeyInfo = {Algorithm, _, _}) when Algorithm == ?rsaEncryption; Algorithm == ?md2WithRSAEncryption; Algorithm == ?md5WithRSAEncryption; Algorithm == ?sha1WithRSAEncryption; Algorithm == ?sha224WithRSAEncryption; Algorithm == ?sha256WithRSAEncryption; Algorithm == ?sha384WithRSAEncryption; Algorithm == ?sha512WithRSAEncryption -> ssl_handshake:key_exchange(client, ssl:tls_version(Version), {psk_premaster_secret, PskIdentity, PremasterSecret, PublicKeyInfo}); rsa_psk_key_exchange(_, _, _, _) -> throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE, pub_key_is_not_rsa)). request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer, signature_algs = SupportedHashSigns}, connection_states = ConnectionStates0, cert_db = CertDbHandle, cert_db_ref = CertDbRef, negotiated_version = Version} = State0, Connection) -> #{security_parameters := #security_parameters{cipher_suite = CipherSuite}} = ssl_record:pending_connection_state(ConnectionStates0, read), TLSVersion = ssl:tls_version(Version), HashSigns = ssl_handshake:available_signature_algs(SupportedHashSigns, TLSVersion, [TLSVersion]), Msg = ssl_handshake:certificate_request(CipherSuite, CertDbHandle, CertDbRef, HashSigns, TLSVersion), State = Connection:queue_handshake(Msg, State0), State#state{client_certificate_requested = true}; request_client_cert(#state{ssl_options = #ssl_options{verify = verify_none}} = State, _) -> State. calculate_master_secret(PremasterSecret, #state{negotiated_version = Version, connection_states = ConnectionStates0, session = Session0} = State0, Connection, _Current, Next) -> case ssl_handshake:master_secret(ssl:tls_version(Version), PremasterSecret, ConnectionStates0, server) of {MasterSecret, ConnectionStates} -> Session = Session0#session{master_secret = MasterSecret}, State1 = State0#state{connection_states = ConnectionStates, session = Session}, {Record, State} = Connection:next_record(State1), Connection:next_event(Next, Record, State); #alert{} = Alert -> handle_own_alert(Alert, Version, certify, State0) end. finalize_handshake(State0, StateName, Connection) -> #state{connection_states = ConnectionStates0} = State1 = cipher_protocol(State0, Connection), ConnectionStates = ssl_record:activate_pending_connection_state(ConnectionStates0, write), State2 = State1#state{connection_states = ConnectionStates}, State = next_protocol(State2, Connection), finished(State, StateName, Connection). next_protocol(#state{role = server} = State, _) -> State; next_protocol(#state{negotiated_protocol = undefined} = State, _) -> State; next_protocol(#state{expecting_next_protocol_negotiation = false} = State, _) -> State; next_protocol(#state{negotiated_protocol = NextProtocol} = State0, Connection) -> NextProtocolMessage = ssl_handshake:next_protocol(NextProtocol), Connection:queue_handshake(NextProtocolMessage, State0). cipher_protocol(State, Connection) -> Connection:queue_change_cipher(#change_cipher_spec{}, State). finished(#state{role = Role, negotiated_version = Version, session = Session, connection_states = ConnectionStates0, tls_handshake_history = Handshake0} = State0, StateName, Connection) -> MasterSecret = Session#session.master_secret, Finished = ssl_handshake:finished(ssl:tls_version(Version), Role, get_current_prf(ConnectionStates0, write), MasterSecret, Handshake0), ConnectionStates = save_verify_data(Role, Finished, ConnectionStates0, StateName), Connection:send_handshake(Finished, State0#state{connection_states = ConnectionStates}). save_verify_data(client, #finished{verify_data = Data}, ConnectionStates, certify) -> ssl_record:set_client_verify_data(current_write, Data, ConnectionStates); save_verify_data(server, #finished{verify_data = Data}, ConnectionStates, cipher) -> ssl_record:set_server_verify_data(current_both, Data, ConnectionStates); save_verify_data(client, #finished{verify_data = Data}, ConnectionStates, abbreviated) -> ssl_record:set_client_verify_data(current_both, Data, ConnectionStates); save_verify_data(server, #finished{verify_data = Data}, ConnectionStates, abbreviated) -> ssl_record:set_server_verify_data(current_write, Data, ConnectionStates). calculate_secret(#server_dh_params{dh_p = Prime, dh_g = Base, dh_y = ServerPublicDhKey} = Params, State, Connection) -> Keys = {_, PrivateDhKey} = crypto:generate_key(dh, [Prime, Base]), PremasterSecret = ssl_handshake:premaster_secret(ServerPublicDhKey, PrivateDhKey, Params), calculate_master_secret(PremasterSecret, State#state{diffie_hellman_keys = Keys}, Connection, certify, certify); calculate_secret(#server_ecdh_params{curve = ECCurve, public = ECServerPubKey}, State=#state{session=Session}, Connection) -> ECDHKeys = public_key:generate_key(ECCurve), PremasterSecret = ssl_handshake:premaster_secret(#'ECPoint'{point = ECServerPubKey}, ECDHKeys), calculate_master_secret(PremasterSecret, State#state{diffie_hellman_keys = ECDHKeys, session = Session#session{ecc = ECCurve}}, Connection, certify, certify); calculate_secret(#server_psk_params{ hint = IdentityHint}, State0, Connection) -> %% store for later use {Record, State} = Connection:next_record(State0#state{psk_identity = IdentityHint}), Connection:next_event(certify, Record, State); calculate_secret(#server_dhe_psk_params{ dh_params = #server_dh_params{dh_p = Prime, dh_g = Base}} = ServerKey, #state{ssl_options = #ssl_options{user_lookup_fun = PSKLookup}} = State, Connection) -> Keys = {_, PrivateDhKey} = crypto:generate_key(dh, [Prime, Base]), PremasterSecret = ssl_handshake:premaster_secret(ServerKey, PrivateDhKey, PSKLookup), calculate_master_secret(PremasterSecret, State#state{diffie_hellman_keys = Keys}, Connection, certify, certify); calculate_secret(#server_srp_params{srp_n = Prime, srp_g = Generator} = ServerKey, #state{ssl_options = #ssl_options{srp_identity = SRPId}} = State, Connection) -> Keys = generate_srp_client_keys(Generator, Prime, 0), PremasterSecret = ssl_handshake:premaster_secret(ServerKey, Keys, SRPId), calculate_master_secret(PremasterSecret, State#state{srp_keys = Keys}, Connection, certify, certify). master_secret(#alert{} = Alert, _) -> Alert; master_secret(PremasterSecret, #state{session = Session, negotiated_version = Version, role = Role, connection_states = ConnectionStates0} = State) -> case ssl_handshake:master_secret(ssl:tls_version(Version), PremasterSecret, ConnectionStates0, Role) of {MasterSecret, ConnectionStates} -> State#state{ session = Session#session{master_secret = MasterSecret}, connection_states = ConnectionStates}; #alert{} = Alert -> Alert end. generate_srp_server_keys(_SrpParams, 10) -> ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); generate_srp_server_keys(SrpParams = #srp_user{generator = Generator, prime = Prime, verifier = Verifier}, N) -> case crypto:generate_key(srp, {host, [Verifier, Generator, Prime, '6a']}) of error -> generate_srp_server_keys(SrpParams, N+1); Keys -> Keys end. generate_srp_client_keys(_Generator, _Prime, 10) -> ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); generate_srp_client_keys(Generator, Prime, N) -> case crypto:generate_key(srp, {user, [Generator, Prime, '6a']}) of error -> generate_srp_client_keys(Generator, Prime, N+1); Keys -> Keys end. handle_srp_identity(Username, {Fun, UserState}) -> case Fun(srp, Username, UserState) of {ok, {SRPParams, Salt, DerivedKey}} when is_atom(SRPParams), is_binary(Salt), is_binary(DerivedKey) -> {Generator, Prime} = ssl_srp_primes:get_srp_params(SRPParams), Verifier = crypto:mod_pow(Generator, DerivedKey, Prime), #srp_user{generator = Generator, prime = Prime, salt = Salt, verifier = Verifier}; #alert{} = Alert -> throw(Alert); _ -> throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER)) end. cipher_role(client, Data, Session, #state{connection_states = ConnectionStates0} = State0, Connection) -> ConnectionStates = ssl_record:set_server_verify_data(current_both, Data, ConnectionStates0), {Record, State} = prepare_connection(State0#state{session = Session, connection_states = ConnectionStates}, Connection), Connection:next_event(connection, Record, State); cipher_role(server, Data, Session, #state{connection_states = ConnectionStates0} = State0, Connection) -> ConnectionStates1 = ssl_record:set_client_verify_data(current_read, Data, ConnectionStates0), {State1, Actions} = finalize_handshake(State0#state{connection_states = ConnectionStates1, session = Session}, cipher, Connection), {Record, State} = prepare_connection(State1, Connection), Connection:next_event(connection, Record, State, Actions). is_anonymous(Algo) when Algo == dh_anon; Algo == ecdh_anon; Algo == psk; Algo == dhe_psk; Algo == rsa_psk; Algo == srp_anon -> true; is_anonymous(_) -> false. get_current_prf(CStates, Direction) -> #{security_parameters := SecParams} = ssl_record:current_connection_state(CStates, Direction), SecParams#security_parameters.prf_algorithm. get_pending_prf(CStates, Direction) -> #{security_parameters := SecParams} = ssl_record:pending_connection_state(CStates, Direction), SecParams#security_parameters.prf_algorithm. opposite_role(client) -> server; opposite_role(server) -> client. record_cb(tls_connection) -> tls_record; record_cb(dtls_connection) -> dtls_record. call(FsmPid, Event) -> try gen_statem:call(FsmPid, Event) catch exit:{noproc, _} -> {error, closed}; exit:{normal, _} -> {error, closed}; exit:{{shutdown, _},_} -> {error, closed} end. get_socket_opts(_,_,[], _, Acc) -> {ok, Acc}; get_socket_opts(Transport, Socket, [mode | Tags], SockOpts, Acc) -> get_socket_opts(Transport, Socket, Tags, SockOpts, [{mode, SockOpts#socket_options.mode} | Acc]); get_socket_opts(Transport, Socket, [packet | Tags], SockOpts, Acc) -> case SockOpts#socket_options.packet of {Type, headers} -> get_socket_opts(Transport, Socket, Tags, SockOpts, [{packet, Type} | Acc]); Type -> get_socket_opts(Transport, Socket, Tags, SockOpts, [{packet, Type} | Acc]) end; get_socket_opts(Transport, Socket, [header | Tags], SockOpts, Acc) -> get_socket_opts(Transport, Socket, Tags, SockOpts, [{header, SockOpts#socket_options.header} | Acc]); get_socket_opts(Transport, Socket, [active | Tags], SockOpts, Acc) -> get_socket_opts(Transport, Socket, Tags, SockOpts, [{active, SockOpts#socket_options.active} | Acc]); get_socket_opts(Transport, Socket, [Tag | Tags], SockOpts, Acc) -> try tls_socket:getopts(Transport, Socket, [Tag]) of {ok, [Opt]} -> get_socket_opts(Transport, Socket, Tags, SockOpts, [Opt | Acc]); {error, Error} -> {error, {options, {socket_options, Tag, Error}}} catch %% So that inet behavior does not crash our process _:Error -> {error, {options, {socket_options, Tag, Error}}} end; get_socket_opts(_, _,Opts, _,_) -> {error, {options, {socket_options, Opts, function_clause}}}. set_socket_opts(_,_, [], SockOpts, []) -> {ok, SockOpts}; set_socket_opts(Transport, Socket, [], SockOpts, Other) -> %% Set non emulated options try tls_socket:setopts(Transport, Socket, Other) of ok -> {ok, SockOpts}; {error, InetError} -> {{error, {options, {socket_options, Other, InetError}}}, SockOpts} catch _:Error -> %% So that inet behavior does not crash our process {{error, {options, {socket_options, Other, Error}}}, SockOpts} end; set_socket_opts(Transport,Socket, [{mode, Mode}| Opts], SockOpts, Other) when Mode == list; Mode == binary -> set_socket_opts(Transport, Socket, Opts, SockOpts#socket_options{mode = Mode}, Other); set_socket_opts(_, _, [{mode, _} = Opt| _], SockOpts, _) -> {{error, {options, {socket_options, Opt}}}, SockOpts}; set_socket_opts(Transport,Socket, [{packet, Packet}| Opts], SockOpts, Other) when Packet == raw; Packet == 0; Packet == 1; Packet == 2; Packet == 4; Packet == asn1; Packet == cdr; Packet == sunrm; Packet == fcgi; Packet == tpkt; Packet == line; Packet == http; Packet == httph; Packet == http_bin; Packet == httph_bin -> set_socket_opts(Transport, Socket, Opts, SockOpts#socket_options{packet = Packet}, Other); set_socket_opts(_, _, [{packet, _} = Opt| _], SockOpts, _) -> {{error, {options, {socket_options, Opt}}}, SockOpts}; set_socket_opts(Transport, Socket, [{header, Header}| Opts], SockOpts, Other) when is_integer(Header) -> set_socket_opts(Transport, Socket, Opts, SockOpts#socket_options{header = Header}, Other); set_socket_opts(_, _, [{header, _} = Opt| _], SockOpts, _) -> {{error,{options, {socket_options, Opt}}}, SockOpts}; set_socket_opts(Transport, Socket, [{active, Active}| Opts], SockOpts, Other) when Active == once; Active == true; Active == false -> set_socket_opts(Transport, Socket, Opts, SockOpts#socket_options{active = Active}, Other); set_socket_opts(_, _, [{active, _} = Opt| _], SockOpts, _) -> {{error, {options, {socket_options, Opt}} }, SockOpts}; set_socket_opts(Transport, Socket, [Opt | Opts], SockOpts, Other) -> set_socket_opts(Transport, Socket, Opts, SockOpts, [Opt | Other]). start_or_recv_cancel_timer(infinity, _RecvFrom) -> undefined; start_or_recv_cancel_timer(Timeout, RecvFrom) -> erlang:send_after(Timeout, self(), {cancel_start_or_recv, RecvFrom}). hibernate_after(connection = StateName, #state{ssl_options=#ssl_options{hibernate_after = HibernateAfter}} = State, Actions) -> {next_state, StateName, State, [{timeout, HibernateAfter, hibernate} | Actions]}; hibernate_after(StateName, State, Actions) -> {next_state, StateName, State, Actions}. terminate_alert(normal, Version, ConnectionStates, Connection) -> Connection:encode_alert(?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), Version, ConnectionStates); terminate_alert({Reason, _}, Version, ConnectionStates, Connection) when Reason == close; Reason == shutdown -> Connection:encode_alert(?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), Version, ConnectionStates); terminate_alert(_, Version, ConnectionStates, Connection) -> {BinAlert, _} = Connection:encode_alert(?ALERT_REC(?FATAL, ?INTERNAL_ERROR), Version, ConnectionStates), BinAlert. handle_trusted_certs_db(#state{ssl_options = #ssl_options{cacertfile = <<>>, cacerts = []}}) -> %% No trusted certs specified ok; handle_trusted_certs_db(#state{cert_db_ref = Ref, cert_db = CertDb, ssl_options = #ssl_options{cacertfile = <<>>}}) when CertDb =/= undefined -> %% Certs provided as DER directly can not be shared %% with other connections and it is safe to delete them when the connection ends. ssl_pkix_db:remove_trusted_certs(Ref, CertDb); handle_trusted_certs_db(#state{file_ref_db = undefined}) -> %% Something went wrong early (typically cacertfile does not %% exist) so there is nothing to handle ok; handle_trusted_certs_db(#state{cert_db_ref = Ref, file_ref_db = RefDb, ssl_options = #ssl_options{cacertfile = File}}) -> case ssl_pkix_db:ref_count(Ref, RefDb, -1) of 0 -> ssl_manager:clean_cert_db(Ref, File); _ -> ok end. prepare_connection(#state{renegotiation = Renegotiate, start_or_recv_from = RecvFrom} = State0, Connection) when Renegotiate =/= {false, first}, RecvFrom =/= undefined -> State1 = Connection:reinit_handshake_data(State0), {Record, State} = Connection:next_record(State1), {Record, ack_connection(State)}; prepare_connection(State0, Connection) -> State = Connection:reinit_handshake_data(State0), {no_record, ack_connection(State)}. ack_connection(#state{renegotiation = {true, Initiater}} = State) when Initiater == internal; Initiater == peer -> State#state{renegotiation = undefined}; ack_connection(#state{renegotiation = {true, From}} = State) -> gen_statem:reply(From, ok), State#state{renegotiation = undefined}; ack_connection(#state{renegotiation = {false, first}, start_or_recv_from = StartFrom, timer = Timer} = State) when StartFrom =/= undefined -> gen_statem:reply(StartFrom, connected), cancel_timer(Timer), State#state{renegotiation = undefined, start_or_recv_from = undefined, timer = undefined}; ack_connection(State) -> State. cancel_timer(undefined) -> ok; cancel_timer(Timer) -> erlang:cancel_timer(Timer), ok. register_session(client, Host, Port, #session{is_resumable = new} = Session0) -> Session = Session0#session{is_resumable = true}, ssl_manager:register_session(Host, Port, Session), Session; register_session(server, _, Port, #session{is_resumable = new} = Session0) -> Session = Session0#session{is_resumable = true}, ssl_manager:register_session(Port, Session), Session; register_session(_, _, _, Session) -> Session. %% Already registered handle_new_session(NewId, CipherSuite, Compression, #state{session = Session0, protocol_cb = Connection} = State0) -> Session = Session0#session{session_id = NewId, cipher_suite = CipherSuite, compression_method = Compression}, {Record, State} = Connection:next_record(State0#state{session = Session}), Connection:next_event(certify, Record, State). handle_resumed_session(SessId, #state{connection_states = ConnectionStates0, negotiated_version = Version, host = Host, port = Port, protocol_cb = Connection, session_cache = Cache, session_cache_cb = CacheCb} = State0) -> Session = CacheCb:lookup(Cache, {{Host, Port}, SessId}), case ssl_handshake:master_secret(ssl:tls_version(Version), Session, ConnectionStates0, client) of {_, ConnectionStates} -> {Record, State} = Connection:next_record(State0#state{ connection_states = ConnectionStates, session = Session}), Connection:next_event(abbreviated, Record, State); #alert{} = Alert -> handle_own_alert(Alert, Version, hello, State0) end. make_premaster_secret({MajVer, MinVer}, rsa) -> Rand = ssl_cipher:random_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2), <>; make_premaster_secret(_, _) -> undefined. negotiated_hashsign(undefined, KexAlg, PubKeyInfo, Version) -> %% Not negotiated choose default case is_anonymous(KexAlg) of true -> {null, anon}; false -> {PubAlg, _, _} = PubKeyInfo, ssl_handshake:select_hashsign_algs(undefined, PubAlg, Version) end; negotiated_hashsign(HashSign = {_, _}, _, _, _) -> HashSign. ssl_options_list(SslOptions) -> Fileds = record_info(fields, ssl_options), Values = tl(tuple_to_list(SslOptions)), ssl_options_list(Fileds, Values, []). ssl_options_list([],[], Acc) -> lists:reverse(Acc); %% Skip internal options, only return user options ssl_options_list([protocol | Keys], [_ | Values], Acc) -> ssl_options_list(Keys, Values, Acc); ssl_options_list([erl_dist | Keys], [_ | Values], Acc) -> ssl_options_list(Keys, Values, Acc); ssl_options_list([renegotiate_at | Keys], [_ | Values], Acc) -> ssl_options_list(Keys, Values, Acc); ssl_options_list([ciphers = Key | Keys], [Value | Values], Acc) -> ssl_options_list(Keys, Values, [{Key, lists:map( fun(Suite) -> ssl_cipher:erl_suite_definition(Suite) end, Value)} | Acc]); ssl_options_list([Key | Keys], [Value | Values], Acc) -> ssl_options_list(Keys, Values, [{Key, Value} | Acc]). handle_active_option(false, connection = StateName, To, Reply, State) -> hibernate_after(StateName, State, [{reply, To, Reply}]); handle_active_option(_, connection = StateName0, To, Reply, #state{protocol_cb = Connection, user_data_buffer = <<>>} = State0) -> %% Need data, set active once {Record, State1} = Connection:next_record_if_active(State0), %% Note: Renogotiation may cause StateName0 =/= StateName case Connection:next_event(StateName0, Record, State1) of {next_state, StateName, State} -> hibernate_after(StateName, State, [{reply, To, Reply}]); {next_state, StateName, State, Actions} -> hibernate_after(StateName, State, [{reply, To, Reply} | Actions]); {stop, Reason, State} -> {stop, Reason, State} end; handle_active_option(_, StateName, To, Reply, #state{user_data_buffer = <<>>} = State) -> %% Active once already set {next_state, StateName, State, [{reply, To, Reply}]}; %% user_data_buffer =/= <<>> handle_active_option(_, StateName0, To, Reply, #state{protocol_cb = Connection} = State0) -> case read_application_data(<<>>, State0) of {stop, Reason, State} -> {stop, Reason, State}; {Record, State1} -> %% Note: Renogotiation may cause StateName0 =/= StateName case Connection:next_event(StateName0, Record, State1) of {next_state, StateName, State} -> hibernate_after(StateName, State, [{reply, To, Reply}]); {next_state, StateName, State, Actions} -> hibernate_after(StateName, State, [{reply, To, Reply} | Actions]); {stop, _, _} = Stop -> Stop end end. encode_packet(Data, #socket_options{packet=Packet}) -> case Packet of 1 -> encode_size_packet(Data, 8, (1 bsl 8) - 1); 2 -> encode_size_packet(Data, 16, (1 bsl 16) - 1); 4 -> encode_size_packet(Data, 32, (1 bsl 32) - 1); _ -> Data end. encode_size_packet(Bin, Size, Max) -> Len = erlang:byte_size(Bin), case Len > Max of true -> throw({error, {badarg, {packet_to_large, Len, Max}}}); false -> <> end. 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. %% Picks ClientData get_data(_, _, <<>>) -> {more, <<>>}; %% Recv timed out save buffer data until next recv get_data(#socket_options{active=false}, undefined, Buffer) -> {passive, Buffer}; get_data(#socket_options{active=Active, packet=Raw}, BytesToRead, Buffer) when Raw =:= raw; Raw =:= 0 -> %% Raw Mode if Active =/= false orelse BytesToRead =:= 0 -> %% Active true or once, or passive mode recv(0) {ok, Buffer, <<>>}; byte_size(Buffer) >= BytesToRead -> %% Passive Mode, recv(Bytes) <> = Buffer, {ok, Data, Rest}; true -> %% Passive Mode not enough data {more, Buffer} end; get_data(#socket_options{packet=Type, packet_size=Size}, _, Buffer) -> PacketOpts = [{packet_size, Size}], case decode_packet(Type, Buffer, PacketOpts) of {more, _} -> {more, Buffer}; Decoded -> Decoded end. decode_packet({http, headers}, Buffer, PacketOpts) -> decode_packet(httph, Buffer, PacketOpts); decode_packet({http_bin, headers}, Buffer, PacketOpts) -> decode_packet(httph_bin, Buffer, PacketOpts); decode_packet(Type, Buffer, PacketOpts) -> erlang:decode_packet(Type, Buffer, PacketOpts). %% Just like with gen_tcp sockets, an ssl socket that has been configured with %% {packet, http} (or {packet, http_bin}) will automatically switch to expect %% HTTP headers after it sees a HTTP Request or HTTP Response line. We %% represent the current state as follows: %% #socket_options.packet =:= http: Expect a HTTP Request/Response line %% #socket_options.packet =:= {http, headers}: Expect HTTP Headers %% Note that if the user has explicitly configured the socket to expect %% HTTP headers using the {packet, httph} option, we don't do any automatic %% switching of states. deliver_app_data(Transport, Socket, SOpts = #socket_options{active=Active, packet=Type}, Data, Pid, From, Tracker, Connection) -> send_or_reply(Active, Pid, From, format_reply(Transport, Socket, SOpts, Data, Tracker, Connection)), SO = case Data of {P, _, _, _} when ((P =:= http_request) or (P =:= http_response)), ((Type =:= http) or (Type =:= http_bin)) -> SOpts#socket_options{packet={Type, headers}}; http_eoh when tuple_size(Type) =:= 2 -> % End of headers - expect another Request/Response line {Type1, headers} = Type, SOpts#socket_options{packet=Type1}; _ -> SOpts end, case Active of once -> SO#socket_options{active=false}; _ -> SO end. format_reply(_, _,#socket_options{active = false, mode = Mode, packet = Packet, header = Header}, Data, _, _) -> {ok, do_format_reply(Mode, Packet, Header, Data)}; format_reply(Transport, Socket, #socket_options{active = _, mode = Mode, packet = Packet, header = Header}, Data, Tracker, Connection) -> {ssl, Connection:socket(self(), Transport, Socket, Connection, Tracker), do_format_reply(Mode, Packet, Header, Data)}. deliver_packet_error(Transport, Socket, SO= #socket_options{active = Active}, Data, Pid, From, Tracker, Connection) -> send_or_reply(Active, Pid, From, format_packet_error(Transport, Socket, SO, Data, Tracker, Connection)). format_packet_error(_, _,#socket_options{active = false, mode = Mode}, Data, _, _) -> {error, {invalid_packet, do_format_reply(Mode, raw, 0, Data)}}; format_packet_error(Transport, Socket, #socket_options{active = _, mode = Mode}, Data, Tracker, Connection) -> {ssl_error, Connection:socket(self(), Transport, Socket, Connection, Tracker), {invalid_packet, do_format_reply(Mode, raw, 0, Data)}}. do_format_reply(binary, _, N, Data) when N > 0 -> % Header mode header(N, Data); do_format_reply(binary, _, _, Data) -> Data; do_format_reply(list, Packet, _, Data) when Packet == http; Packet == {http, headers}; Packet == http_bin; Packet == {http_bin, headers}; Packet == httph; Packet == httph_bin -> Data; do_format_reply(list, _,_, Data) -> binary_to_list(Data). header(0, <<>>) -> <<>>; header(_, <<>>) -> []; header(0, Binary) -> Binary; header(N, Binary) -> <> = Binary, [ByteN | header(N-1, NewBinary)]. send_or_reply(false, _Pid, From, Data) when From =/= undefined -> gen_statem:reply(From, Data); %% Can happen when handling own alert or tcp error/close and there is %% no outstanding gen_fsm sync events send_or_reply(false, no_pid, _, _) -> ok; send_or_reply(_, Pid, _From, Data) -> send_user(Pid, Data). send_user(Pid, Msg) -> Pid ! Msg. alert_user(Transport, Tracker, Socket, connection, Opts, Pid, From, Alert, Role, Connection) -> alert_user(Transport, Tracker, Socket, Opts#socket_options.active, Pid, From, Alert, Role, Connection); alert_user(Transport, Tracker, Socket,_, _, _, From, Alert, Role, Connection) -> alert_user(Transport, Tracker, Socket, From, Alert, Role, Connection). alert_user(Transport, Tracker, Socket, From, Alert, Role, Connection) -> alert_user(Transport, Tracker, Socket, false, no_pid, From, Alert, Role, Connection). alert_user(_, _, _, false = Active, Pid, From, Alert, Role, _) when From =/= undefined -> %% If there is an outstanding ssl_accept | recv %% From will be defined and send_or_reply will %% send the appropriate error message. ReasonCode = ssl_alert:reason_code(Alert, Role), send_or_reply(Active, Pid, From, {error, ReasonCode}); alert_user(Transport, Tracker, Socket, Active, Pid, From, Alert, Role, Connection) -> case ssl_alert:reason_code(Alert, Role) of closed -> send_or_reply(Active, Pid, From, {ssl_closed, Connection:socket(self(), Transport, Socket, Connection, Tracker)}); ReasonCode -> send_or_reply(Active, Pid, From, {ssl_error, Connection:socket(self(), Transport, Socket, Connection, Tracker), ReasonCode}) end. log_alert(true, Info, Alert) -> Txt = ssl_alert:alert_txt(Alert), error_logger:format("SSL: ~p: ~s\n", [Info, Txt]); log_alert(false, _, _) -> ok. handle_own_alert(Alert, Version, StateName, #state{transport_cb = Transport, socket = Socket, protocol_cb = Connection, connection_states = ConnectionStates, ssl_options = SslOpts} = State) -> try %% Try to tell the other side {BinMsg, _} = Connection:encode_alert(Alert, Version, ConnectionStates), Connection:send(Transport, Socket, BinMsg) catch _:_ -> %% Can crash if we are in a uninitialized state ignore end, try %% Try to tell the local user log_alert(SslOpts#ssl_options.log_alert, StateName, Alert), handle_normal_shutdown(Alert,StateName, State) catch _:_ -> ok end, {stop, {shutdown, own_alert}}. handle_normal_shutdown(Alert, _, #state{socket = Socket, transport_cb = Transport, protocol_cb = Connection, start_or_recv_from = StartFrom, tracker = Tracker, role = Role, renegotiation = {false, first}}) -> alert_user(Transport, Tracker,Socket, StartFrom, Alert, Role, Connection); handle_normal_shutdown(Alert, StateName, #state{socket = Socket, socket_options = Opts, transport_cb = Transport, protocol_cb = Connection, user_application = {_Mon, Pid}, tracker = Tracker, start_or_recv_from = RecvFrom, role = Role}) -> alert_user(Transport, Tracker, Socket, StateName, Opts, Pid, RecvFrom, Alert, Role, Connection). invalidate_session(client, Host, Port, Session) -> ssl_manager:invalidate_session(Host, Port, Session); invalidate_session(server, _, Port, Session) -> ssl_manager:invalidate_session(Port, Session). handle_sni_extension(undefined, State) -> State; handle_sni_extension(#sni{hostname = Hostname}, State0) -> NewOptions = update_ssl_options_from_sni(State0#state.ssl_options, Hostname), case NewOptions of undefined -> State0; _ -> {ok, #{cert_db_ref := Ref, cert_db_handle := CertDbHandle, fileref_db_handle := FileRefHandle, session_cache := CacheHandle, crl_db_info := CRLDbHandle, private_key := Key, dh_params := DHParams, own_certificate := OwnCert}} = ssl_config:init(NewOptions, State0#state.role), State0#state{ session = State0#state.session#session{own_certificate = OwnCert}, file_ref_db = FileRefHandle, cert_db_ref = Ref, cert_db = CertDbHandle, crl_db = CRLDbHandle, session_cache = CacheHandle, private_key = Key, diffie_hellman_params = DHParams, ssl_options = NewOptions, sni_hostname = Hostname } end. update_ssl_options_from_sni(OrigSSLOptions, SNIHostname) -> SSLOption = case OrigSSLOptions#ssl_options.sni_fun of undefined -> proplists:get_value(SNIHostname, OrigSSLOptions#ssl_options.sni_hosts); SNIFun -> SNIFun(SNIHostname) end, case SSLOption of undefined -> undefined; _ -> ssl:handle_options(SSLOption, OrigSSLOptions) end. new_emulated([], EmOpts) -> EmOpts; new_emulated(NewEmOpts, _) -> NewEmOpts.