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Diffstat (limited to 'lib/ssl/src/tls_connection.erl')
| -rw-r--r-- | lib/ssl/src/tls_connection.erl | 3085 |
1 files changed, 3085 insertions, 0 deletions
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl new file mode 100644 index 0000000000..6a0461e805 --- /dev/null +++ b/lib/ssl/src/tls_connection.erl @@ -0,0 +1,3085 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2007-2013. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +%% +%%---------------------------------------------------------------------- +%% Purpose: Handles an ssl connection, e.i. both the setup +%% e.i. SSL-Handshake, SSL-Alert and SSL-Cipher protocols and delivering +%% data to the application. All data on the connectinon is received and +%% sent according to the SSL-record protocol. +%%---------------------------------------------------------------------- + +-module(tls_connection). + +-behaviour(gen_fsm). + +-include("tls_handshake.hrl"). +-include("ssl_alert.hrl"). +-include("tls_record.hrl"). +-include("ssl_cipher.hrl"). +-include("ssl_internal.hrl"). +-include("ssl_srp.hrl"). +-include_lib("public_key/include/public_key.hrl"). + +%% Internal application API +-export([send/2, recv/3, connect/7, ssl_accept/6, handshake/2, + socket_control/3, close/1, shutdown/2, + new_user/2, get_opts/2, set_opts/2, info/1, session_info/1, + peer_certificate/1, renegotiation/1, negotiated_next_protocol/1, prf/5]). + +%% Called by ssl_connection_sup +-export([start_link/7]). + +%% gen_fsm callbacks +-export([init/1, hello/2, certify/2, cipher/2, + abbreviated/2, connection/2, handle_event/3, + handle_sync_event/4, handle_info/3, terminate/3, code_change/4]). + +-record(state, { + role, % client | server + user_application, % {MonitorRef, pid()} + transport_cb, % atom() - callback module + data_tag, % atom() - ex tcp. + close_tag, % atom() - ex tcp_closed + error_tag, % atom() - ex tcp_error + host, % string() | ipadress() + port, % integer() + socket, % socket() + ssl_options, % #ssl_options{} + socket_options, % #socket_options{} + connection_states, % #connection_states{} from ssl_record.hrl + tls_packets = [], % Not yet handled decode ssl/tls packets. + tls_record_buffer, % binary() buffer of incomplete records + tls_handshake_buffer, % binary() buffer of incomplete handshakes + tls_handshake_history, % tls_handshake_history() + tls_cipher_texts, % list() received but not deciphered yet + cert_db, % + session, % #session{} from tls_handshake.hrl + session_cache, % + session_cache_cb, % + negotiated_version, % tls_version() + client_certificate_requested = false, + key_algorithm, % atom as defined by cipher_suite + hashsign_algorithm, % atom as defined by cipher_suite + public_key_info, % PKIX: {Algorithm, PublicKey, PublicKeyParams} + private_key, % PKIX: #'RSAPrivateKey'{} + diffie_hellman_params, % PKIX: #'DHParameter'{} relevant for server side + diffie_hellman_keys, % {PublicKey, PrivateKey} + psk_identity, % binary() - server psk identity hint + srp_params, % #srp_user{} + srp_keys, % {PublicKey, PrivateKey} + premaster_secret, % + file_ref_db, % ets() + cert_db_ref, % ref() + bytes_to_read, % integer(), # bytes to read in passive mode + user_data_buffer, % binary() + log_alert, % boolean() + renegotiation, % {boolean(), From | internal | peer} + start_or_recv_from, % "gen_fsm From" + timer, % start_or_recv_timer + send_queue, % queue() + terminated = false, % + allow_renegotiate = true, + expecting_next_protocol_negotiation = false :: boolean(), + next_protocol = undefined :: undefined | binary(), + client_ecc % {Curves, PointFmt} + }). + +-define(DEFAULT_DIFFIE_HELLMAN_PARAMS, + #'DHParameter'{prime = ?DEFAULT_DIFFIE_HELLMAN_PRIME, + base = ?DEFAULT_DIFFIE_HELLMAN_GENERATOR}). +-define(WAIT_TO_ALLOW_RENEGOTIATION, 12000). + +-type state_name() :: hello | abbreviated | certify | cipher | connection. +-type gen_fsm_state_return() :: {next_state, state_name(), #state{}} | + {next_state, state_name(), #state{}, timeout()} | + {stop, term(), #state{}}. + +%%==================================================================== +%% Internal application API +%%==================================================================== + +%%-------------------------------------------------------------------- +-spec send(pid(), iodata()) -> ok | {error, reason()}. +%% +%% Description: Sends data over the ssl connection +%%-------------------------------------------------------------------- +send(Pid, Data) -> + sync_send_all_state_event(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) -> + sync_send_all_state_event(Pid, {recv, Length, Timeout}). +%%-------------------------------------------------------------------- +-spec connect(host(), inet:port_number(), port(), {#ssl_options{}, #socket_options{}}, + pid(), tuple(), timeout()) -> + {ok, #sslsocket{}} | {error, reason()}. +%% +%% Description: Connect to an ssl server. +%%-------------------------------------------------------------------- +connect(Host, Port, Socket, Options, User, CbInfo, Timeout) -> + try start_fsm(client, Host, Port, Socket, Options, User, CbInfo, + Timeout) + catch + exit:{noproc, _} -> + {error, ssl_not_started} + end. +%%-------------------------------------------------------------------- +-spec ssl_accept(inet:port_number(), port(), {#ssl_options{}, #socket_options{}}, + pid(), tuple(), timeout()) -> + {ok, #sslsocket{}} | {error, reason()}. +%% +%% Description: Performs accept on an ssl listen socket. e.i. performs +%% ssl handshake. +%%-------------------------------------------------------------------- +ssl_accept(Port, Socket, Opts, User, CbInfo, Timeout) -> + try 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 sync_send_all_state_event(Pid, {start, Timeout}) of + connected -> + ok; + Error -> + Error + end. +%-------------------------------------------------------------------- +-spec socket_control(port(), pid(), atom()) -> + {ok, #sslsocket{}} | {error, reason()}. +%% +%% Description: Set the ssl process to own the accept socket +%%-------------------------------------------------------------------- +socket_control(Socket, Pid, Transport) -> + case Transport:controlling_process(Socket, Pid) of + ok -> + {ok, ssl_socket:socket(Pid, Transport, Socket)}; + {error, Reason} -> + {error, Reason} + end. + +%%-------------------------------------------------------------------- +-spec close(pid()) -> ok | {error, reason()}. +%% +%% Description: Close an ssl connection +%%-------------------------------------------------------------------- +close(ConnectionPid) -> + case sync_send_all_state_event(ConnectionPid, close) of + {error, closed} -> + ok; + Other -> + Other + end. + +%%-------------------------------------------------------------------- +-spec shutdown(pid(), atom()) -> ok | {error, reason()}. +%% +%% Description: Same as gen_tcp:shutdown/2 +%%-------------------------------------------------------------------- +shutdown(ConnectionPid, How) -> + sync_send_all_state_event(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) -> + sync_send_all_state_event(ConnectionPid, {new_user, User}). + +%%-------------------------------------------------------------------- +-spec negotiated_next_protocol(pid()) -> {ok, binary()} | {error, reason()}. +%% +%% Description: Returns the negotiated protocol +%%-------------------------------------------------------------------- +negotiated_next_protocol(ConnectionPid) -> + sync_send_all_state_event(ConnectionPid, negotiated_next_protocol). + +%%-------------------------------------------------------------------- +-spec get_opts(pid(), list()) -> {ok, list()} | {error, reason()}. +%% +%% Description: Same as inet:getopts/2 +%%-------------------------------------------------------------------- +get_opts(ConnectionPid, OptTags) -> + sync_send_all_state_event(ConnectionPid, {get_opts, OptTags}). +%%-------------------------------------------------------------------- +-spec set_opts(pid(), list()) -> ok | {error, reason()}. +%% +%% Description: Same as inet:setopts/2 +%%-------------------------------------------------------------------- +set_opts(ConnectionPid, Options) -> + sync_send_all_state_event(ConnectionPid, {set_opts, Options}). + +%%-------------------------------------------------------------------- +-spec info(pid()) -> {ok, {atom(), tuple()}} | {error, reason()}. +%% +%% Description: Returns ssl protocol and cipher used for the connection +%%-------------------------------------------------------------------- +info(ConnectionPid) -> + sync_send_all_state_event(ConnectionPid, info). + +%%-------------------------------------------------------------------- +-spec session_info(pid()) -> {ok, list()} | {error, reason()}. +%% +%% Description: Returns info about the ssl session +%%-------------------------------------------------------------------- +session_info(ConnectionPid) -> + sync_send_all_state_event(ConnectionPid, session_info). + +%%-------------------------------------------------------------------- +-spec peer_certificate(pid()) -> {ok, binary()| undefined} | {error, reason()}. +%% +%% Description: Returns the peer cert +%%-------------------------------------------------------------------- +peer_certificate(ConnectionPid) -> + sync_send_all_state_event(ConnectionPid, peer_certificate). + +%%-------------------------------------------------------------------- +-spec renegotiation(pid()) -> ok | {error, reason()}. +%% +%% Description: Starts a renegotiation of the ssl session. +%%-------------------------------------------------------------------- +renegotiation(ConnectionPid) -> + sync_send_all_state_event(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) -> + sync_send_all_state_event(ConnectionPid, {prf, Secret, Label, Seed, WantedLength}). + +%%==================================================================== +%% ssl_connection_sup API +%%==================================================================== + +%%-------------------------------------------------------------------- +-spec start_link(atom(), host(), inet:port_number(), port(), list(), pid(), tuple()) -> + {ok, pid()} | ignore | {error, reason()}. +%% +%% Description: Creates a gen_fsm process which calls Module:init/1 to +%% initialize. To ensure a synchronized start-up procedure, this function +%% does not return until Module:init/1 has returned. +%%-------------------------------------------------------------------- +start_link(Role, Host, Port, Socket, Options, User, CbInfo) -> + {ok, proc_lib:spawn_link(?MODULE, init, [[Role, Host, Port, Socket, Options, User, CbInfo]])}. + +init([Role, Host, Port, Socket, {SSLOpts0, _} = Options, User, CbInfo]) -> + State0 = initial_state(Role, Host, Port, Socket, Options, User, CbInfo), + Handshake = tls_handshake:init_handshake_history(), + TimeStamp = calendar:datetime_to_gregorian_seconds({date(), time()}), + try ssl_init(SSLOpts0, Role) of + {ok, Ref, CertDbHandle, FileRefHandle, CacheHandle, OwnCert, Key, DHParams} -> + Session = State0#state.session, + State = State0#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, + session_cache = CacheHandle, + private_key = Key, + diffie_hellman_params = DHParams}, + gen_fsm:enter_loop(?MODULE, [], hello, State, get_timeout(State)) + catch + throw:Error -> + gen_fsm:enter_loop(?MODULE, [], error, {Error,State0}, get_timeout(State0)) + end. + +%%-------------------------------------------------------------------- +%% Description:There should be one instance of this function for each +%% possible state name. Whenever a gen_fsm receives an event sent +%% using gen_fsm:send_event/2, the instance of this function with the +%% same name as the current state name StateName is called to handle +%% the event. It is also called if a timeout occurs. +%% + +%%-------------------------------------------------------------------- +-spec hello(start | #hello_request{} | #client_hello{} | #server_hello{} | term(), + #state{}) -> gen_fsm_state_return(). +%%-------------------------------------------------------------------- +hello(start, #state{host = Host, port = Port, role = client, + ssl_options = SslOpts, + session = #session{own_certificate = Cert} = Session0, + session_cache = Cache, session_cache_cb = CacheCb, + transport_cb = Transport, socket = Socket, + connection_states = ConnectionStates0, + renegotiation = {Renegotiation, _}} = State0) -> + Hello = tls_handshake:client_hello(Host, Port, ConnectionStates0, SslOpts, + Cache, CacheCb, Renegotiation, Cert), + + Version = Hello#client_hello.client_version, + Handshake0 = tls_handshake:init_handshake_history(), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Hello, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State1 = State0#state{connection_states = ConnectionStates, + negotiated_version = Version, %% Requested version + session = + Session0#session{session_id = Hello#client_hello.session_id}, + tls_handshake_history = Handshake}, + {Record, State} = next_record(State1), + next_state(hello, hello, Record, State); + +hello(start, #state{role = server} = State0) -> + {Record, State} = next_record(State0), + next_state(hello, hello, Record, State); + +hello(#hello_request{}, #state{role = client} = State0) -> + {Record, State} = next_record(State0), + next_state(hello, hello, Record, State); + +hello(#server_hello{cipher_suite = CipherSuite, + compression_method = Compression} = Hello, + #state{session = #session{session_id = OldId}, + connection_states = ConnectionStates0, + role = client, + negotiated_version = ReqVersion, + renegotiation = {Renegotiation, _}, + ssl_options = SslOptions} = State0) -> + case tls_handshake:hello(Hello, SslOptions, ConnectionStates0, Renegotiation) of + #alert{} = Alert -> + handle_own_alert(Alert, ReqVersion, hello, State0); + {Version, NewId, ConnectionStates, NextProtocol} -> + {KeyAlgorithm, _, _, _} = + ssl_cipher:suite_definition(CipherSuite), + + PremasterSecret = make_premaster_secret(ReqVersion, KeyAlgorithm), + + NewNextProtocol = case NextProtocol of + undefined -> + State0#state.next_protocol; + _ -> + NextProtocol + end, + + State = State0#state{key_algorithm = KeyAlgorithm, + hashsign_algorithm = default_hashsign(Version, KeyAlgorithm), + negotiated_version = Version, + connection_states = ConnectionStates, + premaster_secret = PremasterSecret, + expecting_next_protocol_negotiation = NextProtocol =/= undefined, + next_protocol = NewNextProtocol}, + + 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 + end; + +hello(Hello = #client_hello{client_version = ClientVersion}, + State = #state{connection_states = ConnectionStates0, + port = Port, session = #session{own_certificate = Cert} = Session0, + renegotiation = {Renegotiation, _}, + session_cache = Cache, + session_cache_cb = CacheCb, + ssl_options = SslOpts}) -> + case tls_handshake:hello(Hello, SslOpts, {Port, Session0, Cache, CacheCb, + ConnectionStates0, Cert}, Renegotiation) of + {Version, {Type, Session}, ConnectionStates, ProtocolsToAdvertise, + EcPointFormats, EllipticCurves} -> + do_server_hello(Type, ProtocolsToAdvertise, + EcPointFormats, EllipticCurves, + State#state{connection_states = ConnectionStates, + negotiated_version = Version, + session = Session, + client_ecc = {EllipticCurves, EcPointFormats}}); + #alert{} = Alert -> + handle_own_alert(Alert, ClientVersion, hello, State) + end; + +hello(timeout, State) -> + { next_state, hello, State, hibernate }; + +hello(Msg, State) -> + handle_unexpected_message(Msg, hello, State). +%%-------------------------------------------------------------------- +-spec abbreviated(#hello_request{} | #finished{} | term(), + #state{}) -> gen_fsm_state_return(). +%%-------------------------------------------------------------------- +abbreviated(#hello_request{}, State0) -> + {Record, State} = next_record(State0), + next_state(abbreviated, hello, Record, State); + +abbreviated(#finished{verify_data = Data} = Finished, + #state{role = server, + negotiated_version = Version, + tls_handshake_history = Handshake, + session = #session{master_secret = MasterSecret}, + connection_states = ConnectionStates0} = + State) -> + case tls_handshake:verify_connection(Version, Finished, client, + get_current_connection_state_prf(ConnectionStates0, write), + MasterSecret, Handshake) of + verified -> + ConnectionStates = tls_record:set_client_verify_data(current_both, Data, ConnectionStates0), + next_state_connection(abbreviated, + ack_connection(State#state{connection_states = ConnectionStates})); + #alert{} = Alert -> + handle_own_alert(Alert, Version, abbreviated, State) + end; + +abbreviated(#finished{verify_data = Data} = Finished, + #state{role = client, tls_handshake_history = Handshake0, + session = #session{master_secret = MasterSecret}, + negotiated_version = Version, + connection_states = ConnectionStates0} = State) -> + case tls_handshake:verify_connection(Version, Finished, server, + get_pending_connection_state_prf(ConnectionStates0, write), + MasterSecret, Handshake0) of + verified -> + ConnectionStates1 = tls_record:set_server_verify_data(current_read, Data, ConnectionStates0), + {ConnectionStates, Handshake} = + finalize_handshake(State#state{connection_states = ConnectionStates1}, abbreviated), + next_state_connection(abbreviated, + ack_connection(State#state{tls_handshake_history = Handshake, + connection_states = + ConnectionStates})); + #alert{} = Alert -> + handle_own_alert(Alert, Version, abbreviated, State) + end; + +%% only allowed to send next_protocol message after change cipher spec +%% & before finished message and it is not allowed during renegotiation +abbreviated(#next_protocol{selected_protocol = SelectedProtocol}, + #state{role = server, expecting_next_protocol_negotiation = true} = State0) -> + {Record, State} = next_record(State0#state{next_protocol = SelectedProtocol}), + next_state(abbreviated, abbreviated, Record, State); + +abbreviated(timeout, State) -> + { next_state, abbreviated, State, hibernate }; + +abbreviated(Msg, State) -> + handle_unexpected_message(Msg, abbreviated, State). + +%%-------------------------------------------------------------------- +-spec certify(#hello_request{} | #certificate{} | #server_key_exchange{} | + #certificate_request{} | #server_hello_done{} | #client_key_exchange{} | term(), + #state{}) -> gen_fsm_state_return(). +%%-------------------------------------------------------------------- +certify(#hello_request{}, State0) -> + {Record, State} = next_record(State0), + next_state(certify, hello, Record, State); + +certify(#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(#certificate{asn1_certificates = []}, + #state{role = server, + ssl_options = #ssl_options{verify = verify_peer, + fail_if_no_peer_cert = false}} = + State0) -> + {Record, State} = next_record(State0#state{client_certificate_requested = false}), + next_state(certify, certify, Record, State); + +certify(#certificate{} = Cert, + #state{negotiated_version = Version, + role = Role, + cert_db = CertDbHandle, + cert_db_ref = CertDbRef, + ssl_options = Opts} = State) -> + case tls_handshake:certify(Cert, CertDbHandle, CertDbRef, Opts#ssl_options.depth, + Opts#ssl_options.verify, + Opts#ssl_options.verify_fun, Role) of + {PeerCert, PublicKeyInfo} -> + handle_peer_cert(PeerCert, PublicKeyInfo, + State#state{client_certificate_requested = false}); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State) + end; + +certify(#server_key_exchange{} = KeyExchangeMsg, + #state{role = client, negotiated_version = Version, + key_algorithm = Alg} = State0) + 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 -> + case handle_server_key(KeyExchangeMsg, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, certify, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify(#server_key_exchange{} = Msg, + #state{role = client, key_algorithm = rsa} = State) -> + handle_unexpected_message(Msg, certify_server_keyexchange, State); + +certify(#certificate_request{}, State0) -> + {Record, State} = next_record(State0#state{client_certificate_requested = true}), + next_state(certify, certify, Record, State); + +%% PSK and RSA_PSK might bypass the Server-Key-Exchange +certify(#server_hello_done{}, + #state{session = #session{master_secret = undefined}, + negotiated_version = Version, + psk_identity = PSKIdentity, + premaster_secret = undefined, + role = client, + key_algorithm = Alg} = State0) + when Alg == psk -> + case server_psk_master_secret(PSKIdentity, State0) of + #state{} = State -> + client_certify_and_key_exchange(State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify(#server_hello_done{}, + #state{session = #session{master_secret = undefined}, + ssl_options = SslOpts, + negotiated_version = Version, + psk_identity = PSKIdentity, + premaster_secret = undefined, + role = client, + key_algorithm = Alg} = State0) + when Alg == rsa_psk -> + case handle_psk_identity(PSKIdentity, SslOpts#ssl_options.user_lookup_fun) of + {ok, PSK} when is_binary(PSK) -> + PremasterSecret = make_premaster_secret(Version, rsa), + Len = byte_size(PSK), + RealPMS = <<?UINT16(48), PremasterSecret/binary, ?UINT16(Len), PSK/binary>>, + State1 = State0#state{premaster_secret = PremasterSecret}, + State = master_from_premaster_secret(RealPMS, State1), + client_certify_and_key_exchange(State); + #alert{} = Alert -> + Alert; + _ -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + end; + +%% Master secret was determined with help of server-key exchange msg +certify(#server_hello_done{}, + #state{session = #session{master_secret = MasterSecret} = Session, + connection_states = ConnectionStates0, + negotiated_version = Version, + premaster_secret = undefined, + role = client} = State0) -> + case tls_handshake:master_secret(Version, Session, + ConnectionStates0, client) of + {MasterSecret, ConnectionStates} -> + State = State0#state{connection_states = ConnectionStates}, + client_certify_and_key_exchange(State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +%% Master secret is calculated from premaster_secret +certify(#server_hello_done{}, + #state{session = Session0, + connection_states = ConnectionStates0, + negotiated_version = Version, + premaster_secret = PremasterSecret, + role = client} = State0) -> + case tls_handshake:master_secret(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); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify(#client_key_exchange{} = Msg, + #state{role = server, + client_certificate_requested = true, + ssl_options = #ssl_options{fail_if_no_peer_cert = true}} = State) -> + %% We expect a certificate here + handle_unexpected_message(Msg, certify_client_key_exchange, State); + +certify(#client_key_exchange{exchange_keys = Keys}, + State = #state{key_algorithm = KeyAlg, negotiated_version = Version}) -> + try + certify_client_key_exchange(tls_handshake:decode_client_key(Keys, KeyAlg, Version), State) + catch + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State) + end; + + +certify(timeout, State) -> + { next_state, certify, State, hibernate }; + +certify(Msg, State) -> + handle_unexpected_message(Msg, certify, State). + +certify_client_key_exchange(#encrypted_premaster_secret{premaster_secret= EncPMS}, + #state{negotiated_version = Version, + connection_states = ConnectionStates0, + session = Session0, + private_key = Key} = State0) -> + PremasterSecret = tls_handshake:decrypt_premaster_secret(EncPMS, Key), + case tls_handshake:master_secret(Version, PremasterSecret, + ConnectionStates0, server) of + {MasterSecret, ConnectionStates} -> + Session = Session0#session{master_secret = MasterSecret}, + State1 = State0#state{connection_states = ConnectionStates, + session = Session}, + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_diffie_hellman_public{dh_public = ClientPublicDhKey}, + #state{negotiated_version = Version, + diffie_hellman_params = #'DHParameter'{prime = P, + base = G} = Params, + diffie_hellman_keys = {_, ServerDhPrivateKey}} = State0) -> + case dh_master_secret(Params, ClientPublicDhKey, ServerDhPrivateKey, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_ec_diffie_hellman_public{dh_public = ClientPublicEcDhPoint}, + #state{negotiated_version = Version, + diffie_hellman_keys = ECDHKey} = State0) -> + case ec_dh_master_secret(ECDHKey, #'ECPoint'{point = ClientPublicEcDhPoint}, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_psk_identity{identity = ClientPSKIdentity}, + #state{negotiated_version = Version} = State0) -> + case server_psk_master_secret(ClientPSKIdentity, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_dhe_psk_identity{ + identity = ClientPSKIdentity, + dh_public = ClientPublicDhKey}, + #state{negotiated_version = Version, + diffie_hellman_params = #'DHParameter'{prime = P, + base = G}, + diffie_hellman_keys = {_, ServerDhPrivateKey}} = State0) -> + case dhe_psk_master_secret(ClientPSKIdentity, P, G, ClientPublicDhKey, ServerDhPrivateKey, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_rsa_psk_identity{ + identity = PskIdentity, + exchange_keys = + #encrypted_premaster_secret{premaster_secret= EncPMS}}, + #state{negotiated_version = Version, + private_key = Key} = State0) -> + PremasterSecret = tls_handshake:decrypt_premaster_secret(EncPMS, Key), + case server_rsa_psk_master_secret(PskIdentity, PremasterSecret, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end; + +certify_client_key_exchange(#client_srp_public{srp_a = ClientPublicKey}, + #state{negotiated_version = Version, + srp_params = + #srp_user{prime = Prime, + verifier = Verifier} + } = State0) -> + case server_srp_master_secret(Verifier, Prime, ClientPublicKey, State0) of + #state{} = State1 -> + {Record, State} = next_record(State1), + next_state(certify, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end. + +%%-------------------------------------------------------------------- +-spec cipher(#hello_request{} | #certificate_verify{} | #finished{} | term(), + #state{}) -> gen_fsm_state_return(). +%%-------------------------------------------------------------------- +cipher(#hello_request{}, State0) -> + {Record, State} = next_record(State0), + next_state(cipher, hello, Record, State); + +cipher(#certificate_verify{signature = Signature, hashsign_algorithm = CertHashSign}, + #state{role = server, + public_key_info = PublicKeyInfo, + negotiated_version = Version, + session = #session{master_secret = MasterSecret}, + hashsign_algorithm = ConnectionHashSign, + tls_handshake_history = Handshake + } = State0) -> + HashSign = case CertHashSign of + {_, _} -> CertHashSign; + _ -> ConnectionHashSign + end, + case tls_handshake:certificate_verify(Signature, PublicKeyInfo, + Version, HashSign, MasterSecret, Handshake) of + valid -> + {Record, State} = next_record(State0), + next_state(cipher, cipher, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, cipher, State0) + end; + +%% client must send a next protocol message if we are expecting it +cipher(#finished{}, #state{role = server, expecting_next_protocol_negotiation = true, + next_protocol = undefined, negotiated_version = Version} = State0) -> + handle_own_alert(?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE), Version, cipher, State0); + +cipher(#finished{verify_data = Data} = Finished, + #state{negotiated_version = Version, + host = Host, + port = Port, + role = Role, + session = #session{master_secret = MasterSecret} + = Session0, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0} = State) -> + case tls_handshake:verify_connection(Version, Finished, + opposite_role(Role), + get_current_connection_state_prf(ConnectionStates0, read), + MasterSecret, Handshake0) of + verified -> + Session = register_session(Role, Host, Port, Session0), + cipher_role(Role, Data, Session, State); + #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(#next_protocol{selected_protocol = SelectedProtocol}, + #state{role = server, expecting_next_protocol_negotiation = true} = State0) -> + {Record, State} = next_record(State0#state{next_protocol = SelectedProtocol}), + next_state(cipher, cipher, Record, State); + +cipher(timeout, State) -> + { next_state, cipher, State, hibernate }; + +cipher(Msg, State) -> + handle_unexpected_message(Msg, cipher, State). + +%%-------------------------------------------------------------------- +-spec connection(#hello_request{} | #client_hello{} | term(), + #state{}) -> gen_fsm_state_return(). +%%-------------------------------------------------------------------- +connection(#hello_request{}, #state{host = Host, port = Port, + socket = Socket, + session = #session{own_certificate = Cert} = Session0, + session_cache = Cache, session_cache_cb = CacheCb, + ssl_options = SslOpts, + negotiated_version = Version, + transport_cb = Transport, + connection_states = ConnectionStates0, + renegotiation = {Renegotiation, _}, + tls_handshake_history = Handshake0} = State0) -> + Hello = tls_handshake:client_hello(Host, Port, ConnectionStates0, SslOpts, + Cache, CacheCb, Renegotiation, Cert), + + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Hello, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + {Record, State} = next_record(State0#state{connection_states = + ConnectionStates, + session = Session0#session{session_id = Hello#client_hello.session_id}, + tls_handshake_history = Handshake}), + next_state(connection, hello, Record, State); +connection(#client_hello{} = Hello, #state{role = server, allow_renegotiate = true} = State) -> + %% Mitigate Computational DoS attack + %% http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html + %% http://www.thc.org/thc-ssl-dos/ Rather than disabling client + %% initiated renegotiation we will disallow many client initiated + %% renegotiations immediately after each other. + erlang:send_after(?WAIT_TO_ALLOW_RENEGOTIATION, self(), allow_renegotiate), + hello(Hello, State#state{allow_renegotiate = false}); + +connection(#client_hello{}, #state{role = server, allow_renegotiate = false, + connection_states = ConnectionStates0, + socket = Socket, transport_cb = Transport, + negotiated_version = Version} = State0) -> + Alert = ?ALERT_REC(?WARNING, ?NO_RENEGOTIATION), + {BinMsg, ConnectionStates} = + encode_alert(Alert, Version, ConnectionStates0), + Transport:send(Socket, BinMsg), + next_state_connection(connection, State0#state{connection_states = ConnectionStates}); + +connection(timeout, State) -> + {next_state, connection, State, hibernate}; + +connection(Msg, State) -> + handle_unexpected_message(Msg, connection, State). + +%%-------------------------------------------------------------------- +%% Description: Whenever a gen_fsm receives an event sent using +%% gen_fsm:send_all_state_event/2, this function is called to handle +%% the event. Not currently used! +%%-------------------------------------------------------------------- +handle_event(_Event, StateName, State) -> + {next_state, StateName, State, get_timeout(State)}. + +%%-------------------------------------------------------------------- +%% Description: Whenever a gen_fsm receives an event sent using +%% gen_fsm:sync_send_all_state_event/2,3, this function is called to handle +%% the event. +%%-------------------------------------------------------------------- +handle_sync_event({application_data, Data}, From, connection, State) -> + %% 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 -> + {reply, Error, connection, State, get_timeout(State)} + end; +handle_sync_event({application_data, Data}, From, StateName, + #state{send_queue = Queue} = State) -> + %% In renegotiation priorities handshake, send data when handshake is finished + {next_state, StateName, + State#state{send_queue = queue:in({From, Data}, Queue)}, + get_timeout(State)}; + +handle_sync_event({start, Timeout}, StartFrom, hello, State) -> + Timer = start_or_recv_cancel_timer(Timeout, StartFrom), + hello(start, State#state{start_or_recv_from = StartFrom, + timer = Timer}); + +%% The two clauses below could happen if a server upgrades a socket in +%% active mode. Note that in this case we are lucky that +%% controlling_process has been evalueated before receiving handshake +%% messages from client. The server should put the socket in passive +%% mode before telling the client that it is willing to upgrade +%% and before calling ssl:ssl_accept/2. These clauses are +%% here to make sure it is the users problem and not owers if +%% they upgrade an active socket. +handle_sync_event({start,_}, _, connection, State) -> + {reply, connected, connection, State, get_timeout(State)}; +handle_sync_event({start,_}, _From, error, {Error, State = #state{}}) -> + {stop, {shutdown, Error}, {error, Error}, State}; + +handle_sync_event({start, Timeout}, StartFrom, StateName, State) -> + Timer = start_or_recv_cancel_timer(Timeout, StartFrom), + {next_state, StateName, State#state{start_or_recv_from = StartFrom, + timer = Timer}, get_timeout(State)}; + +handle_sync_event(close, _, StateName, State) -> + %% Run terminate before returning + %% so that the reuseaddr inet-option will work + %% as intended. + (catch terminate(user_close, StateName, State)), + {stop, normal, ok, State#state{terminated = true}}; + +handle_sync_event({shutdown, How0}, _, StateName, + #state{transport_cb = Transport, + negotiated_version = Version, + connection_states = ConnectionStates, + socket = Socket} = State) -> + case How0 of + How when How == write; How == both -> + Alert = ?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), + {BinMsg, _} = + encode_alert(Alert, Version, ConnectionStates), + Transport:send(Socket, BinMsg); + _ -> + ok + end, + + case Transport:shutdown(Socket, How0) of + ok -> + {reply, ok, StateName, State, get_timeout(State)}; + Error -> + {stop, normal, Error, State} + end; + +handle_sync_event({recv, N, Timeout}, RecvFrom, connection = StateName, State0) -> + Timer = start_or_recv_cancel_timer(Timeout, RecvFrom), + passive_receive(State0#state{bytes_to_read = N, + start_or_recv_from = RecvFrom, timer = Timer}, StateName); + +%% Doing renegotiate wait with handling request until renegotiate is +%% finished. Will be handled by next_state_is_connection/2. +handle_sync_event({recv, N, Timeout}, RecvFrom, StateName, State) -> + Timer = start_or_recv_cancel_timer(Timeout, RecvFrom), + {next_state, StateName, State#state{bytes_to_read = N, start_or_recv_from = RecvFrom, + timer = Timer}, + get_timeout(State)}; + +handle_sync_event({new_user, User}, _From, StateName, + State =#state{user_application = {OldMon, _}}) -> + NewMon = erlang:monitor(process, User), + erlang:demonitor(OldMon, [flush]), + {reply, ok, StateName, State#state{user_application = {NewMon,User}}, + get_timeout(State)}; + +handle_sync_event({get_opts, OptTags}, _From, StateName, + #state{socket = Socket, + transport_cb = Transport, + socket_options = SockOpts} = State) -> + OptsReply = get_socket_opts(Transport, Socket, OptTags, SockOpts, []), + {reply, OptsReply, StateName, State, get_timeout(State)}; + +handle_sync_event(negotiated_next_protocol, _From, StateName, #state{next_protocol = undefined} = State) -> + {reply, {error, next_protocol_not_negotiated}, StateName, State, get_timeout(State)}; +handle_sync_event(negotiated_next_protocol, _From, StateName, #state{next_protocol = NextProtocol} = State) -> + {reply, {ok, NextProtocol}, StateName, State, get_timeout(State)}; + +handle_sync_event({set_opts, Opts0}, _From, StateName, + #state{socket_options = Opts1, + socket = Socket, + transport_cb = Transport, + user_data_buffer = Buffer} = State0) -> + {Reply, Opts} = set_socket_opts(Transport, Socket, Opts0, Opts1, []), + State1 = State0#state{socket_options = Opts}, + if + Opts#socket_options.active =:= false -> + {reply, Reply, StateName, State1, get_timeout(State1)}; + Buffer =:= <<>>, Opts1#socket_options.active =:= false -> + %% Need data, set active once + {Record, State2} = next_record_if_active(State1), + case next_state(StateName, StateName, Record, State2) of + {next_state, StateName, State, Timeout} -> + {reply, Reply, StateName, State, Timeout}; + {stop, Reason, State} -> + {stop, Reason, State} + end; + Buffer =:= <<>> -> + %% Active once already set + {reply, Reply, StateName, State1, get_timeout(State1)}; + true -> + case read_application_data(<<>>, State1) of + Stop = {stop,_,_} -> + Stop; + {Record, State2} -> + case next_state(StateName, StateName, Record, State2) of + {next_state, StateName, State, Timeout} -> + {reply, Reply, StateName, State, Timeout}; + {stop, Reason, State} -> + {stop, Reason, State} + end + end + end; + +handle_sync_event(renegotiate, From, connection, State) -> + renegotiate(State#state{renegotiation = {true, From}}); + +handle_sync_event(renegotiate, _, StateName, State) -> + {reply, {error, already_renegotiating}, StateName, State, get_timeout(State)}; + +handle_sync_event({prf, Secret, Label, Seed, WantedLength}, _, StateName, + #state{connection_states = ConnectionStates, + negotiated_version = Version} = State) -> + ConnectionState = + tls_record:current_connection_state(ConnectionStates, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{master_secret = MasterSecret, + client_random = ClientRandom, + server_random = ServerRandom} = 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)), + tls_handshake:prf(Version, SecretToUse, Label, SeedToUse, WantedLength) + catch + exit:_ -> {error, badarg}; + error:Reason -> {error, Reason} + end, + {reply, Reply, StateName, State, get_timeout(State)}; + +handle_sync_event(info, _, StateName, + #state{negotiated_version = Version, + session = #session{cipher_suite = Suite}} = State) -> + + AtomVersion = tls_record:protocol_version(Version), + {reply, {ok, {AtomVersion, ssl:suite_definition(Suite)}}, + StateName, State, get_timeout(State)}; + +handle_sync_event(session_info, _, StateName, + #state{session = #session{session_id = Id, + cipher_suite = Suite}} = State) -> + {reply, [{session_id, Id}, + {cipher_suite, ssl:suite_definition(Suite)}], + StateName, State, get_timeout(State)}; + +handle_sync_event(peer_certificate, _, StateName, + #state{session = #session{peer_certificate = Cert}} + = State) -> + {reply, {ok, Cert}, StateName, State, get_timeout(State)}. + +%%-------------------------------------------------------------------- +%% Description: This function is called by a gen_fsm when it receives any +%% other message than a synchronous or asynchronous event +%% (or a system message). +%%-------------------------------------------------------------------- + +%% raw data from TCP, unpack records +handle_info({Protocol, _, Data}, StateName, + #state{data_tag = Protocol} = State0) -> + case next_tls_record(Data, State0) of + {Record, State} -> + next_state(StateName, StateName, Record, State); + #alert{} = Alert -> + handle_normal_shutdown(Alert, StateName, State0), + {stop, {shutdown, own_alert}, State0} + end; + +handle_info({CloseTag, Socket}, StateName, + #state{socket = Socket, close_tag = CloseTag, + negotiated_version = Version} = State) -> + %% Note that as of TLS 1.1, + %% failure to properly close a connection no longer requires that a + %% session not be resumed. This is a change from TLS 1.0 to conform + %% with widespread implementation practice. + case Version of + {1, N} when N >= 1 -> + ok; + _ -> + %% As invalidate_sessions here causes performance issues, + %% we will conform to the widespread implementation + %% practice and go aginst the spec + %%invalidate_session(Role, Host, Port, Session) + ok + end, + handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State), + {stop, {shutdown, transport_closed}, State}; + +handle_info({ErrorTag, Socket, econnaborted}, StateName, + #state{socket = Socket, transport_cb = Transport, + start_or_recv_from = StartFrom, role = Role, + error_tag = ErrorTag} = State) when StateName =/= connection -> + alert_user(Transport, Socket, StartFrom, ?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), Role), + {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}; + +handle_info(allow_renegotiate, StateName, State) -> + {next_state, StateName, State#state{allow_renegotiate = true}, get_timeout(State)}; + +handle_info({cancel_start_or_recv, StartFrom}, StateName, + #state{renegotiation = {false, first}} = State) when StateName =/= connection -> + gen_fsm:reply(StartFrom, {error, timeout}), + {stop, {shutdown, user_timeout}, State#state{timer = undefined}}; + +handle_info({cancel_start_or_recv, RecvFrom}, StateName, #state{start_or_recv_from = RecvFrom} = State) -> + gen_fsm:reply(RecvFrom, {error, timeout}), + {next_state, StateName, State#state{start_or_recv_from = undefined, + bytes_to_read = undefined, + timer = undefined}, get_timeout(State)}; + +handle_info({cancel_start_or_recv, _RecvFrom}, StateName, State) -> + {next_state, StateName, State#state{timer = undefined}, get_timeout(State)}; + +handle_info(Msg, StateName, State) -> + Report = io_lib:format("SSL: Got unexpected info: ~p ~n", [Msg]), + error_logger:info_report(Report), + {next_state, StateName, State, get_timeout(State)}. + +%%-------------------------------------------------------------------- +%% Description:This function is called by a gen_fsm when it is about +%% to terminate. It should be the opposite of Module:init/1 and do any +%% necessary cleaning up. When it returns, the gen_fsm terminates with +%% Reason. The return value is ignored. +%%-------------------------------------------------------------------- +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. + ok; + +terminate({shutdown, transport_closed}, StateName, #state{send_queue = SendQueue, + renegotiation = Renegotiate} = State) -> + handle_unrecv_data(StateName, State), + handle_trusted_certs_db(State), + notify_senders(SendQueue), + notify_renegotiater(Renegotiate); + +terminate({shutdown, own_alert}, _StateName, #state{send_queue = SendQueue, + renegotiation = Renegotiate} = State) -> + handle_trusted_certs_db(State), + notify_senders(SendQueue), + notify_renegotiater(Renegotiate); + +terminate(Reason, connection, #state{negotiated_version = Version, + connection_states = ConnectionStates, + transport_cb = Transport, + socket = Socket, send_queue = SendQueue, + renegotiation = Renegotiate} = State) -> + handle_trusted_certs_db(State), + notify_senders(SendQueue), + notify_renegotiater(Renegotiate), + BinAlert = terminate_alert(Reason, Version, ConnectionStates), + Transport:send(Socket, BinAlert), + workaround_transport_delivery_problems(Socket, Transport); + +terminate(_Reason, _StateName, #state{transport_cb = Transport, + socket = Socket, send_queue = SendQueue, + renegotiation = Renegotiate} = State) -> + handle_trusted_certs_db(State), + notify_senders(SendQueue), + notify_renegotiater(Renegotiate), + Transport:close(Socket). + +%%-------------------------------------------------------------------- +%% code_change(OldVsn, StateName, State, Extra) -> {ok, StateName, NewState} +%% Description: Convert process state when code is changed +%%-------------------------------------------------------------------- +code_change(_OldVsn, StateName, State, _Extra) -> + {ok, StateName, State}. + +%%-------------------------------------------------------------------- +%%% Internal functions +%%-------------------------------------------------------------------- +start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = false},_} = Opts, + User, {CbModule, _,_, _} = CbInfo, + Timeout) -> + try + {ok, Pid} = ssl_connection_sup:start_child([Role, Host, Port, Socket, + Opts, User, CbInfo]), + {ok, SslSocket} = socket_control(Socket, Pid, CbModule), + ok = handshake(SslSocket, Timeout), + {ok, SslSocket} + catch + error:{badmatch, {error, _} = Error} -> + Error + end; + +start_fsm(Role, Host, Port, Socket, {#ssl_options{erl_dist = true},_} = Opts, + User, {CbModule, _,_, _} = CbInfo, + Timeout) -> + try + {ok, Pid} = ssl_connection_sup:start_child_dist([Role, Host, Port, Socket, + Opts, User, CbInfo]), + {ok, SslSocket} = socket_control(Socket, Pid, CbModule), + ok = handshake(SslSocket, Timeout), + {ok, SslSocket} + catch + error:{badmatch, {error, _} = Error} -> + Error + end. + +ssl_init(SslOpts, Role) -> + + init_manager_name(SslOpts#ssl_options.erl_dist), + + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, OwnCert} = init_certificates(SslOpts, Role), + PrivateKey = + init_private_key(PemCacheHandle, SslOpts#ssl_options.key, SslOpts#ssl_options.keyfile, + SslOpts#ssl_options.password, Role), + DHParams = init_diffie_hellman(PemCacheHandle, SslOpts#ssl_options.dh, SslOpts#ssl_options.dhfile, Role), + {ok, CertDbRef, CertDbHandle, FileRefHandle, CacheHandle, OwnCert, PrivateKey, DHParams}. + +init_manager_name(false) -> + put(ssl_manager, ssl_manager); +init_manager_name(true) -> + put(ssl_manager, ssl_manager_dist). + +init_certificates(#ssl_options{cacerts = CaCerts, + cacertfile = CACertFile, + certfile = CertFile, + cert = Cert}, Role) -> + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle} = + try + Certs = case CaCerts of + undefined -> + CACertFile; + _ -> + {der, CaCerts} + end, + {ok, _, _, _, _, _} = ssl_manager:connection_init(Certs, Role) + catch + _:Reason -> + file_error(CACertFile, {cacertfile, Reason}) + end, + init_certificates(Cert, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, CertFile, Role). + +init_certificates(undefined, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, <<>>, _) -> + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, undefined}; + +init_certificates(undefined, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, CertFile, client) -> + try + %% Ignoring potential proxy-certificates see: + %% http://dev.globus.org/wiki/Security/ProxyFileFormat + [OwnCert|_] = ssl_certificate:file_to_certificats(CertFile, PemCacheHandle), + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, OwnCert} + catch _Error:_Reason -> + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheHandle, undefined} + end; + +init_certificates(undefined, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheRef, CertFile, server) -> + try + [OwnCert|_] = ssl_certificate:file_to_certificats(CertFile, PemCacheHandle), + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheRef, OwnCert} + catch + _:Reason -> + file_error(CertFile, {certfile, Reason}) + end; +init_certificates(Cert, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheRef, _, _) -> + {ok, CertDbRef, CertDbHandle, FileRefHandle, PemCacheHandle, CacheRef, Cert}. + +init_private_key(_, undefined, <<>>, _Password, _Client) -> + undefined; +init_private_key(DbHandle, undefined, KeyFile, Password, _) -> + try + {ok, List} = ssl_manager:cache_pem_file(KeyFile, DbHandle), + [PemEntry] = [PemEntry || PemEntry = {PKey, _ , _} <- List, + PKey =:= 'RSAPrivateKey' orelse + PKey =:= 'DSAPrivateKey' orelse + PKey =:= 'ECPrivateKey' orelse + PKey =:= 'PrivateKeyInfo' + ], + private_key(public_key:pem_entry_decode(PemEntry, Password)) + catch + _:Reason -> + file_error(KeyFile, {keyfile, Reason}) + end; + +%% First two clauses are for backwards compatibility +init_private_key(_,{rsa, PrivateKey}, _, _,_) -> + init_private_key('RSAPrivateKey', PrivateKey); +init_private_key(_,{dsa, PrivateKey},_,_,_) -> + init_private_key('DSAPrivateKey', PrivateKey); +init_private_key(_,{ec, PrivateKey},_,_,_) -> + init_private_key('ECPrivateKey', PrivateKey); +init_private_key(_,{Asn1Type, PrivateKey},_,_,_) -> + private_key(init_private_key(Asn1Type, PrivateKey)). + +init_private_key(Asn1Type, PrivateKey) -> + public_key:der_decode(Asn1Type, PrivateKey). + +private_key(#'PrivateKeyInfo'{privateKeyAlgorithm = + #'PrivateKeyInfo_privateKeyAlgorithm'{algorithm = ?'rsaEncryption'}, + privateKey = Key}) -> + public_key:der_decode('RSAPrivateKey', iolist_to_binary(Key)); + +private_key(#'PrivateKeyInfo'{privateKeyAlgorithm = + #'PrivateKeyInfo_privateKeyAlgorithm'{algorithm = ?'id-dsa'}, + privateKey = Key}) -> + public_key:der_decode('DSAPrivateKey', iolist_to_binary(Key)); + +private_key(Key) -> + Key. + +-spec(file_error(_,_) -> no_return()). +file_error(File, Throw) -> + case Throw of + {Opt,{badmatch, {error, {badmatch, Error}}}} -> + throw({options, {Opt, binary_to_list(File), Error}}); + _ -> + throw(Throw) + end. + +init_diffie_hellman(_,Params, _,_) when is_binary(Params)-> + public_key:der_decode('DHParameter', Params); +init_diffie_hellman(_,_,_, client) -> + undefined; +init_diffie_hellman(_,_,undefined, _) -> + ?DEFAULT_DIFFIE_HELLMAN_PARAMS; +init_diffie_hellman(DbHandle,_, DHParamFile, server) -> + try + {ok, List} = ssl_manager:cache_pem_file(DHParamFile,DbHandle), + case [Entry || Entry = {'DHParameter', _ , _} <- List] of + [Entry] -> + public_key:pem_entry_decode(Entry); + [] -> + ?DEFAULT_DIFFIE_HELLMAN_PARAMS + end + catch + _:Reason -> + file_error(DHParamFile, {dhfile, Reason}) + end. + +sync_send_all_state_event(FsmPid, Event) -> + try gen_fsm:sync_send_all_state_event(FsmPid, Event, infinity) + catch + exit:{noproc, _} -> + {error, closed}; + exit:{normal, _} -> + {error, closed}; + exit:{{shutdown, _},_} -> + {error, closed} + end. + +%% We do currently not support cipher suites that use fixed DH. +%% If we want to implement that we should add a code +%% here to extract DH parameters form cert. +handle_peer_cert(PeerCert, PublicKeyInfo, + #state{session = Session} = State0) -> + State1 = State0#state{session = + Session#session{peer_certificate = PeerCert}, + public_key_info = PublicKeyInfo}, + State2 = case PublicKeyInfo of + {?'id-ecPublicKey', #'ECPoint'{point = _ECPoint} = PublicKey, PublicKeyParams} -> + ECDHKey = public_key:generate_key(PublicKeyParams), + State3 = State1#state{diffie_hellman_keys = ECDHKey}, + ec_dh_master_secret(ECDHKey, PublicKey, State3); + + _ -> State1 + end, + {Record, State} = next_record(State2), + next_state(certify, certify, Record, State). + +certify_client(#state{client_certificate_requested = true, role = client, + connection_states = ConnectionStates0, + transport_cb = Transport, + negotiated_version = Version, + cert_db = CertDbHandle, + cert_db_ref = CertDbRef, + session = #session{own_certificate = OwnCert}, + socket = Socket, + tls_handshake_history = Handshake0} = State) -> + Certificate = tls_handshake:certificate(OwnCert, CertDbHandle, CertDbRef, client), + {BinCert, ConnectionStates, Handshake} = + encode_handshake(Certificate, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinCert), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; +certify_client(#state{client_certificate_requested = false} = State) -> + State. + +verify_client_cert(#state{client_certificate_requested = true, role = client, + connection_states = ConnectionStates0, + transport_cb = Transport, + negotiated_version = Version, + socket = Socket, + private_key = PrivateKey, + session = #session{master_secret = MasterSecret, + own_certificate = OwnCert}, + hashsign_algorithm = HashSign, + tls_handshake_history = Handshake0} = State) -> + + %%TODO: for TLS 1.2 we can choose a different/stronger HashSign combination for this. + case tls_handshake:client_certificate_verify(OwnCert, MasterSecret, + Version, HashSign, PrivateKey, Handshake0) of + #certificate_verify{} = Verified -> + {BinVerified, ConnectionStates, Handshake} = + encode_handshake(Verified, Version, + ConnectionStates0, Handshake0), + Transport:send(Socket, BinVerified), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + ignore -> + State; + #alert{} = Alert -> + throw(Alert) + end; +verify_client_cert(#state{client_certificate_requested = false} = State) -> + State. + +do_server_hello(Type, NextProtocolsToSend, + EcPointFormats, EllipticCurves, + #state{negotiated_version = Version, + session = #session{session_id = SessId}, + connection_states = ConnectionStates0, + renegotiation = {Renegotiation, _}} + = State0) when is_atom(Type) -> + + ServerHello = + tls_handshake:server_hello(SessId, Version, + ConnectionStates0, Renegotiation, + NextProtocolsToSend, EcPointFormats, EllipticCurves), + State = server_hello(ServerHello, + State0#state{expecting_next_protocol_negotiation = + NextProtocolsToSend =/= undefined}), + case Type of + new -> + new_server_hello(ServerHello, State); + resumed -> + resumed_server_hello(State) + end. + +new_server_hello(#server_hello{cipher_suite = CipherSuite, + compression_method = Compression, + session_id = SessionId}, + #state{session = Session0, + negotiated_version = Version} = State0) -> + try server_certify_and_key_exchange(State0) of + #state{} = State1 -> + State2 = server_hello_done(State1), + Session = + Session0#session{session_id = SessionId, + cipher_suite = CipherSuite, + compression_method = Compression}, + {Record, State} = next_record(State2#state{session = Session}), + next_state(hello, certify, Record, State) + catch + #alert{} = Alert -> + handle_own_alert(Alert, Version, hello, State0) + end. + +resumed_server_hello(#state{session = Session, + connection_states = ConnectionStates0, + negotiated_version = Version} = State0) -> + + case tls_handshake:master_secret(Version, Session, + ConnectionStates0, server) of + {_, ConnectionStates1} -> + State1 = State0#state{connection_states = ConnectionStates1, + session = Session}, + {ConnectionStates, Handshake} = + finalize_handshake(State1, abbreviated), + State2 = State1#state{connection_states = + ConnectionStates, + tls_handshake_history = Handshake}, + {Record, State} = next_record(State2), + next_state(hello, abbreviated, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, hello, State0) + end. + +handle_new_session(NewId, CipherSuite, Compression, #state{session = Session0} = State0) -> + Session = Session0#session{session_id = NewId, + cipher_suite = CipherSuite, + compression_method = Compression}, + {Record, State} = next_record(State0#state{session = Session}), + next_state(hello, certify, Record, State). + +handle_resumed_session(SessId, #state{connection_states = ConnectionStates0, + negotiated_version = Version, + host = Host, port = Port, + session_cache = Cache, + session_cache_cb = CacheCb} = State0) -> + Session = CacheCb:lookup(Cache, {{Host, Port}, SessId}), + case tls_handshake:master_secret(Version, Session, + ConnectionStates0, client) of + {_, ConnectionStates} -> + {Record, State} = + next_record(State0#state{ + connection_states = ConnectionStates, + session = Session}), + next_state(hello, abbreviated, Record, State); + #alert{} = Alert -> + handle_own_alert(Alert, Version, hello, State0) + end. + + +client_certify_and_key_exchange(#state{negotiated_version = Version} = + State0) -> + try do_client_certify_and_key_exchange(State0) of + State1 = #state{} -> + {ConnectionStates, Handshake} = finalize_handshake(State1, certify), + State2 = State1#state{connection_states = ConnectionStates, + %% Reinitialize + client_certificate_requested = false, + tls_handshake_history = Handshake}, + {Record, State} = next_record(State2), + next_state(certify, cipher, Record, State) + catch + throw:#alert{} = Alert -> + handle_own_alert(Alert, Version, certify, State0) + end. + +do_client_certify_and_key_exchange(State0) -> + State1 = certify_client(State0), + State2 = key_exchange(State1), + verify_client_cert(State2). + +server_certify_and_key_exchange(State0) -> + State1 = certify_server(State0), + State2 = key_exchange(State1), + request_client_cert(State2). + +server_hello(ServerHello, #state{transport_cb = Transport, + socket = Socket, + negotiated_version = Version, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0} = State) -> + CipherSuite = ServerHello#server_hello.cipher_suite, + {KeyAlgorithm, _, _, _} = ssl_cipher:suite_definition(CipherSuite), + {BinMsg, ConnectionStates1, Handshake1} = + encode_handshake(ServerHello, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates1, + tls_handshake_history = Handshake1, + key_algorithm = KeyAlgorithm, + hashsign_algorithm = default_hashsign(Version, KeyAlgorithm)}. + +server_hello_done(#state{transport_cb = Transport, + socket = Socket, + negotiated_version = Version, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0} = State) -> + + HelloDone = tls_handshake:server_hello_done(), + + {BinHelloDone, ConnectionStates, Handshake} = + encode_handshake(HelloDone, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinHelloDone), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}. + +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{transport_cb = Transport, + socket = Socket, + negotiated_version = Version, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0, + cert_db = CertDbHandle, + cert_db_ref = CertDbRef, + session = #session{own_certificate = OwnCert}} = State) -> + case tls_handshake:certificate(OwnCert, CertDbHandle, CertDbRef, server) of + CertMsg = #certificate{} -> + {BinCertMsg, ConnectionStates, Handshake} = + encode_handshake(CertMsg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinCertMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake + }; + 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, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) + when Algo == dhe_dss; + Algo == dhe_rsa; + Algo == dh_anon -> + DHKeys = public_key:generate_key(Params), + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {dh, DHKeys, Params, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + diffie_hellman_keys = DHKeys, + tls_handshake_history = Handshake}; + +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, + connection_states = ConnectionStates0, + negotiated_version = Version, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) + when Algo == ecdhe_ecdsa; Algo == ecdhe_rsa; + Algo == ecdh_anon -> + + ECDHKeys = public_key:generate_key(select_curve(State)), + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {ecdh, ECDHKeys, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake1} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + diffie_hellman_keys = ECDHKeys, + tls_handshake_history = Handshake1}; + +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, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) -> + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {psk, PskIdentityHint, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +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, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) -> + DHKeys = public_key:generate_key(Params), + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {dhe_psk, PskIdentityHint, DHKeys, Params, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + diffie_hellman_keys = DHKeys, + tls_handshake_history = Handshake}; + +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, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) -> + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {psk, PskIdentityHint, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +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, + tls_handshake_history = Handshake0, + socket = Socket, + transport_cb = Transport + } = State) + 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, + ConnectionState = + tls_record:pending_connection_state(ConnectionStates0, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Msg = tls_handshake:key_exchange(server, Version, {srp, Keys, SrpParams, + HashSignAlgo, ClientRandom, + ServerRandom, + PrivateKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + srp_params = SrpParams, + srp_keys = Keys, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + connection_states = ConnectionStates0, + key_algorithm = rsa, + public_key_info = PublicKeyInfo, + negotiated_version = Version, + premaster_secret = PremasterSecret, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) -> + Msg = rsa_key_exchange(Version, PremasterSecret, PublicKeyInfo), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; +key_exchange(#state{role = client, + connection_states = ConnectionStates0, + key_algorithm = Algorithm, + negotiated_version = Version, + diffie_hellman_keys = {DhPubKey, _}, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) + when Algorithm == dhe_dss; + Algorithm == dhe_rsa; + Algorithm == dh_anon -> + Msg = tls_handshake:key_exchange(client, Version, {dh, DhPubKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + connection_states = ConnectionStates0, + key_algorithm = Algorithm, + negotiated_version = Version, + diffie_hellman_keys = Keys, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) + when Algorithm == ecdhe_ecdsa; Algorithm == ecdhe_rsa; + Algorithm == ecdh_ecdsa; Algorithm == ecdh_rsa; + Algorithm == ecdh_anon -> + Msg = tls_handshake:key_exchange(client, Version, {ecdh, Keys}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + ssl_options = SslOpts, + connection_states = ConnectionStates0, + key_algorithm = psk, + negotiated_version = Version, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) -> + Msg = tls_handshake:key_exchange(client, Version, {psk, SslOpts#ssl_options.psk_identity}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + ssl_options = SslOpts, + connection_states = ConnectionStates0, + key_algorithm = dhe_psk, + negotiated_version = Version, + diffie_hellman_keys = {DhPubKey, _}, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) -> + Msg = tls_handshake:key_exchange(client, Version, {dhe_psk, SslOpts#ssl_options.psk_identity, DhPubKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + ssl_options = SslOpts, + connection_states = ConnectionStates0, + key_algorithm = rsa_psk, + public_key_info = PublicKeyInfo, + negotiated_version = Version, + premaster_secret = PremasterSecret, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) -> + Msg = rsa_psk_key_exchange(Version, SslOpts#ssl_options.psk_identity, PremasterSecret, PublicKeyInfo), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}; + +key_exchange(#state{role = client, + connection_states = ConnectionStates0, + key_algorithm = Algorithm, + negotiated_version = Version, + srp_keys = {ClientPubKey, _}, + socket = Socket, transport_cb = Transport, + tls_handshake_history = Handshake0} = State) + when Algorithm == srp_dss; + Algorithm == srp_rsa; + Algorithm == srp_anon -> + Msg = tls_handshake:key_exchange(client, Version, {srp, ClientPubKey}), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}. + +rsa_key_exchange(Version, PremasterSecret, PublicKeyInfo = {Algorithm, _, _}) + when Algorithm == ?rsaEncryption; + Algorithm == ?md2WithRSAEncryption; + Algorithm == ?md5WithRSAEncryption; + Algorithm == ?sha1WithRSAEncryption; + Algorithm == ?sha224WithRSAEncryption; + Algorithm == ?sha256WithRSAEncryption; + Algorithm == ?sha384WithRSAEncryption; + Algorithm == ?sha512WithRSAEncryption + -> + tls_handshake:key_exchange(client, Version, + {premaster_secret, PremasterSecret, + PublicKeyInfo}); +rsa_key_exchange(_, _, _) -> + throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE)). + +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 + -> + tls_handshake:key_exchange(client, Version, + {psk_premaster_secret, PskIdentity, PremasterSecret, + PublicKeyInfo}); +rsa_psk_key_exchange(_, _, _, _) -> + throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE)). + +request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer}, + connection_states = ConnectionStates0, + cert_db = CertDbHandle, + cert_db_ref = CertDbRef, + tls_handshake_history = Handshake0, + negotiated_version = Version, + socket = Socket, + transport_cb = Transport} = State) -> + Msg = tls_handshake:certificate_request(ConnectionStates0, CertDbHandle, CertDbRef), + {BinMsg, ConnectionStates, Handshake} = + encode_handshake(Msg, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{client_certificate_requested = true, + connection_states = ConnectionStates, + tls_handshake_history = Handshake}; +request_client_cert(#state{ssl_options = #ssl_options{verify = verify_none}} = + State) -> + State. + +finalize_handshake(State, StateName) -> + ConnectionStates0 = cipher_protocol(State), + + ConnectionStates = + tls_record:activate_pending_connection_state(ConnectionStates0, + write), + + State1 = State#state{connection_states = ConnectionStates}, + State2 = next_protocol(State1), + finished(State2, StateName). + +next_protocol(#state{role = server} = State) -> + State; +next_protocol(#state{next_protocol = undefined} = State) -> + State; +next_protocol(#state{expecting_next_protocol_negotiation = false} = State) -> + State; +next_protocol(#state{transport_cb = Transport, socket = Socket, + negotiated_version = Version, + next_protocol = NextProtocol, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0} = State) -> + NextProtocolMessage = tls_handshake:next_protocol(NextProtocol), + {BinMsg, ConnectionStates, Handshake} = encode_handshake(NextProtocolMessage, Version, ConnectionStates0, Handshake0), + Transport:send(Socket, BinMsg), + State#state{connection_states = ConnectionStates, + tls_handshake_history = Handshake}. + +cipher_protocol(#state{connection_states = ConnectionStates0, + socket = Socket, + negotiated_version = Version, + transport_cb = Transport}) -> + {BinChangeCipher, ConnectionStates} = + encode_change_cipher(#change_cipher_spec{}, + Version, ConnectionStates0), + Transport:send(Socket, BinChangeCipher), + ConnectionStates. + +finished(#state{role = Role, socket = Socket, negotiated_version = Version, + transport_cb = Transport, + session = Session, + connection_states = ConnectionStates0, + tls_handshake_history = Handshake0}, StateName) -> + MasterSecret = Session#session.master_secret, + Finished = tls_handshake:finished(Version, Role, + get_current_connection_state_prf(ConnectionStates0, write), + MasterSecret, Handshake0), + ConnectionStates1 = save_verify_data(Role, Finished, ConnectionStates0, StateName), + {BinFinished, ConnectionStates, Handshake} = + encode_handshake(Finished, Version, ConnectionStates1, Handshake0), + Transport:send(Socket, BinFinished), + {ConnectionStates, Handshake}. + +save_verify_data(client, #finished{verify_data = Data}, ConnectionStates, certify) -> + tls_record:set_client_verify_data(current_write, Data, ConnectionStates); +save_verify_data(server, #finished{verify_data = Data}, ConnectionStates, cipher) -> + tls_record:set_server_verify_data(current_both, Data, ConnectionStates); +save_verify_data(client, #finished{verify_data = Data}, ConnectionStates, abbreviated) -> + tls_record:set_client_verify_data(current_both, Data, ConnectionStates); +save_verify_data(server, #finished{verify_data = Data}, ConnectionStates, abbreviated) -> + tls_record:set_server_verify_data(current_write, Data, ConnectionStates). + +handle_server_key(#server_key_exchange{exchange_keys = Keys}, + #state{key_algorithm = KeyAlg, + negotiated_version = Version} = State) -> + Params = tls_handshake:decode_server_key(Keys, KeyAlg, Version), + HashSign = connection_hashsign(Params#server_key_params.hashsign, State), + case HashSign of + {_, SignAlgo} when SignAlgo == anon; SignAlgo == ecdh_anon -> + server_master_secret(Params#server_key_params.params, State); + _ -> + verify_server_key(Params, HashSign, State) + end. + +verify_server_key(#server_key_params{params = Params, + params_bin = EncParams, + signature = Signature}, + HashSign = {HashAlgo, _}, + #state{negotiated_version = Version, + public_key_info = PubKeyInfo, + connection_states = ConnectionStates} = State) -> + ConnectionState = + tls_record:pending_connection_state(ConnectionStates, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + Hash = tls_handshake:server_key_exchange_hash(HashAlgo, + <<ClientRandom/binary, + ServerRandom/binary, + EncParams/binary>>), + case tls_handshake:verify_signature(Version, Hash, HashSign, Signature, PubKeyInfo) of + true -> + server_master_secret(Params, State); + false -> + ?ALERT_REC(?FATAL, ?DECRYPT_ERROR) + end. + +server_master_secret(#server_dh_params{dh_p = P, dh_g = G, dh_y = ServerPublicDhKey}, + State) -> + dh_master_secret(P, G, ServerPublicDhKey, undefined, State); + +server_master_secret(#server_ecdh_params{curve = ECCurve, public = ECServerPubKey}, + State) -> + ECDHKeys = public_key:generate_key(ECCurve), + ec_dh_master_secret(ECDHKeys, #'ECPoint'{point = ECServerPubKey}, State#state{diffie_hellman_keys = ECDHKeys}); + +server_master_secret(#server_psk_params{ + hint = IdentityHint}, + State) -> + %% store for later use + State#state{psk_identity = IdentityHint}; + +server_master_secret(#server_dhe_psk_params{ + hint = IdentityHint, + dh_params = #server_dh_params{dh_p = P, dh_g = G, dh_y = ServerPublicDhKey}}, + State) -> + dhe_psk_master_secret(IdentityHint, P, G, ServerPublicDhKey, undefined, State); + +server_master_secret(#server_srp_params{srp_n = N, srp_g = G, srp_s = S, srp_b = B}, + State) -> + client_srp_master_secret(G, N, S, B, undefined, State). + +master_from_premaster_secret(PremasterSecret, + #state{session = Session, + negotiated_version = Version, role = Role, + connection_states = ConnectionStates0} = State) -> + case tls_handshake:master_secret(Version, PremasterSecret, + ConnectionStates0, Role) of + {MasterSecret, ConnectionStates} -> + State#state{ + session = + Session#session{master_secret = MasterSecret}, + connection_states = ConnectionStates}; + #alert{} = Alert -> + Alert + end. + +dh_master_secret(#'DHParameter'{} = Params, OtherPublicDhKey, MyPrivateKey, State) -> + PremasterSecret = + public_key:compute_key(OtherPublicDhKey, MyPrivateKey, Params), + master_from_premaster_secret(PremasterSecret, State). + +dh_master_secret(Prime, Base, PublicDhKey, undefined, State) -> + Keys = {_, PrivateDhKey} = crypto:generate_key(dh, [Prime, Base]), + dh_master_secret(Prime, Base, PublicDhKey, PrivateDhKey, State#state{diffie_hellman_keys = Keys}); + +dh_master_secret(Prime, Base, PublicDhKey, PrivateDhKey, State) -> + PremasterSecret = + crypto:compute_key(dh, PublicDhKey, PrivateDhKey, [Prime, Base]), + master_from_premaster_secret(PremasterSecret, State). + +ec_dh_master_secret(ECDHKeys, ECPoint, State) -> + PremasterSecret = + public_key:compute_key(ECPoint, ECDHKeys), + master_from_premaster_secret(PremasterSecret, State). + +handle_psk_identity(_PSKIdentity, LookupFun) + when LookupFun == undefined -> + error; +handle_psk_identity(PSKIdentity, {Fun, UserState}) -> + Fun(psk, PSKIdentity, UserState). + +server_psk_master_secret(ClientPSKIdentity, + #state{ssl_options = SslOpts} = State) -> + case handle_psk_identity(ClientPSKIdentity, SslOpts#ssl_options.user_lookup_fun) of + {ok, PSK} when is_binary(PSK) -> + Len = byte_size(PSK), + PremasterSecret = <<?UINT16(Len), 0:(Len*8), ?UINT16(Len), PSK/binary>>, + master_from_premaster_secret(PremasterSecret, State); + #alert{} = Alert -> + Alert; + _ -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + end. + +dhe_psk_master_secret(PSKIdentity, Prime, Base, PublicDhKey, undefined, State) -> + Keys = {_, PrivateDhKey} = + crypto:generate_key(dh, [Prime, Base]), + dhe_psk_master_secret(PSKIdentity, Prime, Base, PublicDhKey, PrivateDhKey, + State#state{diffie_hellman_keys = Keys}); + +dhe_psk_master_secret(PSKIdentity, Prime, Base, PublicDhKey, PrivateDhKey, + #state{ssl_options = SslOpts} = State) -> + case handle_psk_identity(PSKIdentity, SslOpts#ssl_options.user_lookup_fun) of + {ok, PSK} when is_binary(PSK) -> + DHSecret = + crypto:compute_key(dh, PublicDhKey, PrivateDhKey, + [Prime, Base]), + DHLen = erlang:byte_size(DHSecret), + Len = erlang:byte_size(PSK), + PremasterSecret = <<?UINT16(DHLen), DHSecret/binary, ?UINT16(Len), PSK/binary>>, + master_from_premaster_secret(PremasterSecret, State); + #alert{} = Alert -> + Alert; + _ -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + end. + +server_rsa_psk_master_secret(PskIdentity, PremasterSecret, + #state{ssl_options = SslOpts} = State) -> + case handle_psk_identity(PskIdentity, SslOpts#ssl_options.user_lookup_fun) of + {ok, PSK} when is_binary(PSK) -> + Len = byte_size(PSK), + RealPMS = <<?UINT16(48), PremasterSecret/binary, ?UINT16(Len), PSK/binary>>, + master_from_premaster_secret(RealPMS, State); + #alert{} = Alert -> + Alert; + _ -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + 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. + +server_srp_master_secret(Verifier, Prime, ClientPub, State = #state{srp_keys = ServerKeys}) -> + case crypto:compute_key(srp, ClientPub, ServerKeys, {host, [Verifier, Prime, '6a']}) of + error -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); + PremasterSecret -> + master_from_premaster_secret(PremasterSecret, State) + end. + +client_srp_master_secret(_Generator, _Prime, _Salt, _ServerPub, #alert{} = Alert, _State) -> + Alert; +client_srp_master_secret(Generator, Prime, Salt, ServerPub, undefined, State) -> + Keys = generate_srp_client_keys(Generator, Prime, 0), + client_srp_master_secret(Generator, Prime, Salt, ServerPub, Keys, State#state{srp_keys = Keys}); + +client_srp_master_secret(Generator, Prime, Salt, ServerPub, ClientKeys, + #state{ssl_options = SslOpts} = State) -> + case ssl_srp_primes:check_srp_params(Generator, Prime) of + ok -> + {Username, Password} = SslOpts#ssl_options.srp_identity, + DerivedKey = crypto:hash(sha, [Salt, crypto:hash(sha, [Username, <<$:>>, Password])]), + case crypto:compute_key(srp, ServerPub, ClientKeys, {user, [DerivedKey, Prime, Generator, '6a']}) of + error -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); + PremasterSecret -> + master_from_premaster_secret(PremasterSecret, State) + end; + _ -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + end. + +cipher_role(client, Data, Session, #state{connection_states = ConnectionStates0} = State) -> + ConnectionStates = tls_record:set_server_verify_data(current_both, Data, ConnectionStates0), + next_state_connection(cipher, ack_connection(State#state{session = Session, + connection_states = ConnectionStates})); + +cipher_role(server, Data, Session, #state{connection_states = ConnectionStates0} = State) -> + ConnectionStates1 = tls_record:set_client_verify_data(current_read, Data, ConnectionStates0), + {ConnectionStates, Handshake} = + finalize_handshake(State#state{connection_states = ConnectionStates1, + session = Session}, cipher), + next_state_connection(cipher, ack_connection(State#state{connection_states = + ConnectionStates, + session = Session, + tls_handshake_history = + Handshake})). +encode_alert(#alert{} = Alert, Version, ConnectionStates) -> + tls_record:encode_alert_record(Alert, Version, ConnectionStates). + +encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) -> + tls_record:encode_change_cipher_spec(Version, ConnectionStates). + +encode_handshake(HandshakeRec, Version, ConnectionStates0, Handshake0) -> + Frag = tls_handshake:encode_handshake(HandshakeRec, Version), + Handshake1 = tls_handshake:update_handshake_history(Handshake0, Frag), + {E, ConnectionStates1} = + tls_record:encode_handshake(Frag, Version, ConnectionStates0), + {E, ConnectionStates1, Handshake1}. + +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 -> <<Len:Size, Bin/binary>> + end. + +decode_alerts(Bin) -> + decode_alerts(Bin, []). + +decode_alerts(<<?BYTE(Level), ?BYTE(Description), Rest/binary>>, Acc) -> + A = ?ALERT_REC(Level, Description), + decode_alerts(Rest, [A | Acc]); +decode_alerts(<<>>, Acc) -> + lists:reverse(Acc, []). + +passive_receive(State0 = #state{user_data_buffer = Buffer}, StateName) -> + case Buffer of + <<>> -> + {Record, State} = next_record(State0), + next_state(StateName, StateName, Record, State); + _ -> + case read_application_data(<<>>, State0) of + Stop = {stop, _, _} -> + Stop; + {Record, State} -> + next_state(StateName, StateName, Record, State) + end + end. + +read_application_data(Data, #state{user_application = {_Mon, Pid}, + socket = Socket, + transport_cb = Transport, + socket_options = SOpts, + bytes_to_read = BytesToRead, + start_or_recv_from = RecvFrom, + timer = Timer, + user_data_buffer = Buffer0} = State0) -> + Buffer1 = if + Buffer0 =:= <<>> -> Data; + Data =:= <<>> -> Buffer0; + true -> <<Buffer0/binary, Data/binary>> + end, + case get_data(SOpts, BytesToRead, Buffer1) of + {ok, ClientData, Buffer} -> % Send data + SocketOpt = deliver_app_data(Transport, Socket, SOpts, ClientData, Pid, RecvFrom), + 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 + next_record_if_active(State); + true -> %% We have more data + read_application_data(<<>>, State) + end; + {more, Buffer} -> % no reply, we need more data + next_record(State0#state{user_data_buffer = Buffer}); + {passive, Buffer} -> + 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), + {stop, normal, State0} + end. + +write_application_data(Data0, From, #state{socket = Socket, + negotiated_version = Version, + transport_cb = Transport, + connection_states = ConnectionStates0, + send_queue = SendQueue, + 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 -> + renegotiate(State#state{send_queue = queue:in_r({From, Data}, SendQueue), + renegotiation = {true, internal}}); + false -> + {Msgs, ConnectionStates} = tls_record:encode_data(Data, Version, ConnectionStates0), + Result = Transport:send(Socket, Msgs), + {reply, Result, + connection, State#state{connection_states = ConnectionStates}, get_timeout(State)} + end. + +time_to_renegotiate(_Data, #connection_states{current_write = + #connection_state{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) + <<Data:BytesToRead/binary, Rest/binary>> = 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) -> + send_or_reply(Active, Pid, From, format_reply(Transport, Socket, SOpts, Data)), + 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) -> + {ssl, ssl_socket:socket(self(), Transport, Socket), do_format_reply(Mode, Packet, Header, Data)}. + +deliver_packet_error(Transport, Socket, SO= #socket_options{active = Active}, Data, Pid, From) -> + send_or_reply(Active, Pid, From, format_packet_error(Transport, Socket, SO, Data)). + +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) -> + {ssl_error, ssl_socket:socket(self(), Transport, Socket), {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) -> + <<?BYTE(ByteN), NewBinary/binary>> = Binary, + [ByteN | header(N-1, NewBinary)]. + +send_or_reply(false, _Pid, From, Data) when From =/= undefined -> + gen_fsm: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). + +opposite_role(client) -> + server; +opposite_role(server) -> + client. + +send_user(Pid, Msg) -> + Pid ! Msg. + +handle_tls_handshake(Handle, StateName, #state{tls_packets = [Packet]} = State) -> + FsmReturn = {next_state, StateName, State#state{tls_packets = []}}, + Handle(Packet, FsmReturn); + +handle_tls_handshake(Handle, StateName, #state{tls_packets = [Packet | Packets]} = State0) -> + FsmReturn = {next_state, StateName, State0#state{tls_packets = Packets}}, + case Handle(Packet, FsmReturn) of + {next_state, NextStateName, State, _Timeout} -> + handle_tls_handshake(Handle, NextStateName, State); + {stop, _,_} = Stop -> + Stop + end. + +next_state(Current,_, #alert{} = Alert, #state{negotiated_version = Version} = State) -> + handle_own_alert(Alert, Version, Current, State); + +next_state(_,Next, no_record, State) -> + {next_state, Next, State, get_timeout(State)}; + +next_state(_,Next, #ssl_tls{type = ?ALERT, fragment = EncAlerts}, State) -> + Alerts = decode_alerts(EncAlerts), + handle_alerts(Alerts, {next_state, Next, State, get_timeout(State)}); + +next_state(Current, Next, #ssl_tls{type = ?HANDSHAKE, fragment = Data}, + State0 = #state{tls_handshake_buffer = Buf0, negotiated_version = Version}) -> + Handle = + fun({#hello_request{} = Packet, _}, {next_state, connection = SName, State}) -> + %% This message should not be included in handshake + %% message hashes. Starts new handshake (renegotiation) + Hs0 = tls_handshake:init_handshake_history(), + ?MODULE:SName(Packet, State#state{tls_handshake_history=Hs0, + renegotiation = {true, peer}}); + ({#hello_request{} = Packet, _}, {next_state, SName, State}) -> + %% This message should not be included in handshake + %% message hashes. Already in negotiation so it will be ignored! + ?MODULE:SName(Packet, State); + ({#client_hello{} = Packet, Raw}, {next_state, connection = SName, State}) -> + Version = Packet#client_hello.client_version, + Hs0 = tls_handshake:init_handshake_history(), + Hs1 = tls_handshake:update_handshake_history(Hs0, Raw), + ?MODULE:SName(Packet, State#state{tls_handshake_history=Hs1, + renegotiation = {true, peer}}); + ({Packet, Raw}, {next_state, SName, State = #state{tls_handshake_history=Hs0}}) -> + Hs1 = tls_handshake:update_handshake_history(Hs0, Raw), + ?MODULE:SName(Packet, State#state{tls_handshake_history=Hs1}); + (_, StopState) -> StopState + end, + try + {Packets, Buf} = tls_handshake:get_tls_handshake(Version,Data,Buf0), + State = State0#state{tls_packets = Packets, tls_handshake_buffer = Buf}, + handle_tls_handshake(Handle, Next, State) + catch throw:#alert{} = Alert -> + handle_own_alert(Alert, Version, Current, State0) + end; + +next_state(_, StateName, #ssl_tls{type = ?APPLICATION_DATA, fragment = Data}, State0) -> + case read_application_data(Data, State0) of + Stop = {stop,_,_} -> + Stop; + {Record, State} -> + next_state(StateName, StateName, Record, State) + end; +next_state(Current, Next, #ssl_tls{type = ?CHANGE_CIPHER_SPEC, fragment = <<1>>} = + _ChangeCipher, + #state{connection_states = ConnectionStates0} = State0) -> + ConnectionStates1 = + tls_record:activate_pending_connection_state(ConnectionStates0, read), + {Record, State} = next_record(State0#state{connection_states = ConnectionStates1}), + next_state(Current, Next, Record, State); +next_state(Current, Next, #ssl_tls{type = _Unknown}, State0) -> + %% Ignore unknown type + {Record, State} = next_record(State0), + next_state(Current, Next, Record, State). + +next_tls_record(Data, #state{tls_record_buffer = Buf0, + tls_cipher_texts = CT0} = State0) -> + case tls_record:get_tls_records(Data, Buf0) of + {Records, Buf1} -> + CT1 = CT0 ++ Records, + next_record(State0#state{tls_record_buffer = Buf1, + tls_cipher_texts = CT1}); + #alert{} = Alert -> + Alert + end. + +next_record(#state{tls_packets = [], tls_cipher_texts = [], socket = Socket, + transport_cb = Transport} = State) -> + ssl_socket:setopts(Transport, Socket, [{active,once}]), + {no_record, State}; +next_record(#state{tls_packets = [], tls_cipher_texts = [CT | Rest], + connection_states = ConnStates0} = State) -> + case tls_record:decode_cipher_text(CT, ConnStates0) of + {Plain, ConnStates} -> + {Plain, State#state{tls_cipher_texts = Rest, connection_states = ConnStates}}; + #alert{} = Alert -> + {Alert, State} + end; +next_record(State) -> + {no_record, State}. + +next_record_if_active(State = + #state{socket_options = + #socket_options{active = false}}) -> + {no_record ,State}; + +next_record_if_active(State) -> + next_record(State). + +next_state_connection(StateName, #state{send_queue = Queue0, + negotiated_version = Version, + socket = Socket, + transport_cb = Transport, + connection_states = ConnectionStates0 + } = State) -> + %% Send queued up data that was queued while renegotiating + case queue:out(Queue0) of + {{value, {From, Data}}, Queue} -> + {Msgs, ConnectionStates} = + tls_record:encode_data(Data, Version, ConnectionStates0), + Result = Transport:send(Socket, Msgs), + gen_fsm:reply(From, Result), + next_state_connection(StateName, + State#state{connection_states = ConnectionStates, + send_queue = Queue}); + {empty, Queue0} -> + next_state_is_connection(StateName, State) + end. + +%% In next_state_is_connection/1: clear tls_handshake, +%% premaster_secret and public_key_info (only needed during handshake) +%% to reduce memory foot print of a connection. +next_state_is_connection(_, State = + #state{start_or_recv_from = RecvFrom, + socket_options = + #socket_options{active = false}}) when RecvFrom =/= undefined -> + passive_receive(State#state{premaster_secret = undefined, + public_key_info = undefined, + tls_handshake_history = tls_handshake:init_handshake_history()}, connection); + +next_state_is_connection(StateName, State0) -> + {Record, State} = next_record_if_active(State0), + next_state(StateName, connection, Record, State#state{premaster_secret = undefined, + public_key_info = undefined, + tls_handshake_history = tls_handshake:init_handshake_history()}). + +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 + +invalidate_session(client, Host, Port, Session) -> + ssl_manager:invalidate_session(Host, Port, Session); +invalidate_session(server, _, Port, Session) -> + ssl_manager:invalidate_session(Port, Session). + +initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User, + {CbModule, DataTag, CloseTag, ErrorTag}) -> + ConnectionStates = tls_record:init_connection_states(Role), + + SessionCacheCb = case application:get_env(ssl, session_cb) of + {ok, Cb} when is_atom(Cb) -> + Cb; + _ -> + ssl_session_cache + end, + + Monitor = erlang:monitor(process, User), + + #state{socket_options = SocketOptions, + %% We do not want to save the password in the state so that + %% could be written in the clear into error logs. + ssl_options = SSLOptions#ssl_options{password = undefined}, + session = #session{is_resumable = new}, + transport_cb = CbModule, + data_tag = DataTag, + close_tag = CloseTag, + error_tag = ErrorTag, + role = Role, + host = Host, + port = Port, + socket = Socket, + connection_states = ConnectionStates, + tls_handshake_buffer = <<>>, + tls_record_buffer = <<>>, + tls_cipher_texts = [], + user_application = {Monitor, User}, + user_data_buffer = <<>>, + log_alert = true, + session_cache_cb = SessionCacheCb, + renegotiation = {false, first}, + start_or_recv_from = undefined, + send_queue = queue:new() + }. + +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 ssl_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 ssl_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]). + +handle_alerts([], Result) -> + Result; +handle_alerts(_, {stop, _, _} = Stop) -> + %% If it is a fatal alert immediately close + Stop; +handle_alerts([Alert | Alerts], {next_state, StateName, State, _Timeout}) -> + handle_alerts(Alerts, handle_alert(Alert, StateName, State)). + +handle_alert(#alert{level = ?FATAL} = Alert, StateName, + #state{socket = Socket, transport_cb = Transport, + start_or_recv_from = From, host = Host, + port = Port, session = Session, user_application = {_Mon, Pid}, + log_alert = Log, role = Role, socket_options = Opts} = State) -> + invalidate_session(Role, Host, Port, Session), + log_alert(Log, StateName, Alert), + alert_user(Transport, Socket, StateName, Opts, Pid, From, Alert, Role), + {stop, normal, State}; + +handle_alert(#alert{level = ?WARNING, description = ?CLOSE_NOTIFY} = Alert, + StateName, State) -> + handle_normal_shutdown(Alert, StateName, State), + {stop, {shutdown, peer_close}, State}; + +handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName, + #state{log_alert = Log, renegotiation = {true, internal}} = State) -> + log_alert(Log, StateName, Alert), + handle_normal_shutdown(Alert, StateName, State), + {stop, {shutdown, peer_close}, State}; + +handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName, + #state{log_alert = Log, renegotiation = {true, From}} = State0) -> + log_alert(Log, StateName, Alert), + gen_fsm:reply(From, {error, renegotiation_rejected}), + {Record, State} = next_record(State0), + next_state(StateName, connection, Record, State); + +handle_alert(#alert{level = ?WARNING, description = ?USER_CANCELED} = Alert, StateName, + #state{log_alert = Log} = State0) -> + log_alert(Log, StateName, Alert), + {Record, State} = next_record(State0), + next_state(StateName, StateName, Record, State). + +alert_user(Transport, Socket, connection, Opts, Pid, From, Alert, Role) -> + alert_user(Transport,Socket, Opts#socket_options.active, Pid, From, Alert, Role); +alert_user(Transport, Socket,_, _, _, From, Alert, Role) -> + alert_user(Transport, Socket, From, Alert, Role). + +alert_user(Transport, Socket, From, Alert, Role) -> + alert_user(Transport, Socket, false, no_pid, From, Alert, Role). + +alert_user(_,_, false = Active, Pid, From, Alert, Role) -> + %% 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, Socket, Active, Pid, From, Alert, Role) -> + case ssl_alert:reason_code(Alert, Role) of + closed -> + send_or_reply(Active, Pid, From, + {ssl_closed, ssl_socket:socket(self(), Transport, Socket)}); + ReasonCode -> + send_or_reply(Active, Pid, From, + {ssl_error, ssl_socket:socket(self(), Transport, Socket), 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, + connection_states = ConnectionStates, + log_alert = Log} = State) -> + try %% Try to tell the other side + {BinMsg, _} = + encode_alert(Alert, Version, ConnectionStates), + Transport:send(Socket, BinMsg), + workaround_transport_delivery_problems(Socket, Transport) + catch _:_ -> %% Can crash if we are in a uninitialized state + ignore + end, + try %% Try to tell the local user + log_alert(Log, StateName, Alert), + handle_normal_shutdown(Alert,StateName, State) + catch _:_ -> + ok + end, + {stop, {shutdown, own_alert}, State}. + +handle_normal_shutdown(Alert, _, #state{socket = Socket, + transport_cb = Transport, + start_or_recv_from = StartFrom, + role = Role, renegotiation = {false, first}}) -> + alert_user(Transport, Socket, StartFrom, Alert, Role); + +handle_normal_shutdown(Alert, StateName, #state{socket = Socket, + socket_options = Opts, + transport_cb = Transport, + user_application = {_Mon, Pid}, + start_or_recv_from = RecvFrom, role = Role}) -> + alert_user(Transport, Socket, StateName, Opts, Pid, RecvFrom, Alert, Role). + +handle_unexpected_message(Msg, Info, #state{negotiated_version = Version} = State) -> + Alert = ?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE), + handle_own_alert(Alert, Version, {Info, Msg}, State). + +make_premaster_secret({MajVer, MinVer}, rsa) -> + Rand = ssl:random_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2), + <<?BYTE(MajVer), ?BYTE(MinVer), Rand/binary>>; +make_premaster_secret(_, _) -> + undefined. + +ack_connection(#state{renegotiation = {true, Initiater}} = State) + when Initiater == internal; + Initiater == peer -> + State#state{renegotiation = undefined}; +ack_connection(#state{renegotiation = {true, From}} = State) -> + gen_fsm: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_fsm:reply(StartFrom, connected), + cancel_timer(Timer), + State#state{renegotiation = undefined, start_or_recv_from = undefined, timer = undefined}; +ack_connection(State) -> + State. + +renegotiate(#state{role = client} = State) -> + %% Handle same way as if server requested + %% the renegotiation + Hs0 = tls_handshake:init_handshake_history(), + connection(#hello_request{}, State#state{tls_handshake_history = Hs0}); +renegotiate(#state{role = server, + socket = Socket, + transport_cb = Transport, + negotiated_version = Version, + connection_states = ConnectionStates0} = State0) -> + HelloRequest = tls_handshake:hello_request(), + Frag = tls_handshake:encode_handshake(HelloRequest, Version), + Hs0 = tls_handshake:init_handshake_history(), + {BinMsg, ConnectionStates} = + tls_record:encode_handshake(Frag, Version, ConnectionStates0), + Transport:send(Socket, BinMsg), + {Record, State} = next_record(State0#state{connection_states = + ConnectionStates, + tls_handshake_history = Hs0}), + next_state(connection, hello, Record, State#state{allow_renegotiate = true}). + +notify_senders(SendQueue) -> + lists:foreach(fun({From, _}) -> + gen_fsm:reply(From, {error, closed}) + end, queue:to_list(SendQueue)). + +notify_renegotiater({true, From}) when not is_atom(From) -> + gen_fsm:reply(From, {error, closed}); +notify_renegotiater(_) -> + ok. + +terminate_alert(Reason, Version, ConnectionStates) when Reason == normal; + Reason == user_close -> + {BinAlert, _} = encode_alert(?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), + Version, ConnectionStates), + BinAlert; +terminate_alert({shutdown, _}, Version, ConnectionStates) -> + {BinAlert, _} = encode_alert(?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), + Version, ConnectionStates), + BinAlert; + +terminate_alert(_, Version, ConnectionStates) -> + {BinAlert, _} = encode_alert(?ALERT_REC(?FATAL, ?INTERNAL_ERROR), + Version, ConnectionStates), + BinAlert. + +workaround_transport_delivery_problems(Socket, gen_tcp = Transport) -> + %% Standard trick to try to make sure all + %% data sent to the tcp port is really delivered to the + %% peer application before tcp port is closed so that the peer will + %% get the correct TLS alert message and not only a transport close. + ssl_socket:setopts(Transport, Socket, [{active, false}]), + Transport:shutdown(Socket, write), + %% Will return when other side has closed or after 30 s + %% e.g. we do not want to hang if something goes wrong + %% with the network but we want to maximise the odds that + %% peer application gets all data sent on the tcp connection. + Transport:recv(Socket, 0, 30000); +workaround_transport_delivery_problems(Socket, Transport) -> + Transport:close(Socket). + +get_timeout(#state{ssl_options=#ssl_options{hibernate_after = undefined}}) -> + infinity; +get_timeout(#state{ssl_options=#ssl_options{hibernate_after = HibernateAfter}}) -> + HibernateAfter. + +handle_trusted_certs_db(#state{ssl_options = #ssl_options{cacertfile = <<>>}}) -> + %% No trusted certs specified + ok; +handle_trusted_certs_db(#state{cert_db_ref = Ref, + cert_db = CertDb, + ssl_options = #ssl_options{cacertfile = 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. + +get_current_connection_state_prf(CStates, Direction) -> + CS = tls_record:current_connection_state(CStates, Direction), + CS#connection_state.security_parameters#security_parameters.prf_algorithm. +get_pending_connection_state_prf(CStates, Direction) -> + CS = tls_record:pending_connection_state(CStates, Direction), + CS#connection_state.security_parameters#security_parameters.prf_algorithm. + +connection_hashsign(HashSign = {_, _}, _State) -> + HashSign; +connection_hashsign(_, #state{hashsign_algorithm = HashSign}) -> + HashSign. + +%% RFC 5246, Sect. 7.4.1.4.1. Signature Algorithms +%% If the client does not send the signature_algorithms extension, the +%% server MUST do the following: +%% +%% - If the negotiated key exchange algorithm is one of (RSA, DHE_RSA, +%% DH_RSA, RSA_PSK, ECDH_RSA, ECDHE_RSA), behave as if client had +%% sent the value {sha1,rsa}. +%% +%% - If the negotiated key exchange algorithm is one of (DHE_DSS, +%% DH_DSS), behave as if the client had sent the value {sha1,dsa}. +%% +%% - If the negotiated key exchange algorithm is one of (ECDH_ECDSA, +%% ECDHE_ECDSA), behave as if the client had sent value {sha1,ecdsa}. + +default_hashsign(_Version = {Major, Minor}, KeyExchange) + when Major == 3 andalso Minor >= 3 andalso + (KeyExchange == rsa orelse + KeyExchange == dhe_rsa orelse + KeyExchange == dh_rsa orelse + KeyExchange == ecdhe_rsa orelse + KeyExchange == srp_rsa) -> + {sha, rsa}; +default_hashsign(_Version, KeyExchange) + when KeyExchange == rsa; + KeyExchange == dhe_rsa; + KeyExchange == dh_rsa; + KeyExchange == ecdhe_rsa; + KeyExchange == srp_rsa -> + {md5sha, rsa}; +default_hashsign(_Version, KeyExchange) + when KeyExchange == ecdhe_ecdsa; + KeyExchange == ecdh_ecdsa; + KeyExchange == ecdh_rsa -> + {sha, ecdsa}; +default_hashsign(_Version, KeyExchange) + when KeyExchange == dhe_dss; + KeyExchange == dh_dss; + KeyExchange == srp_dss -> + {sha, dsa}; +default_hashsign(_Version, KeyExchange) + when KeyExchange == dh_anon; + KeyExchange == ecdh_anon; + KeyExchange == psk; + KeyExchange == dhe_psk; + KeyExchange == rsa_psk; + KeyExchange == srp_anon -> + {null, anon}. + +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}). + +cancel_timer(undefined) -> + ok; +cancel_timer(Timer) -> + erlang:cancel_timer(Timer), + ok. + +handle_unrecv_data(StateName, #state{socket = Socket, transport_cb = Transport} = State) -> + ssl_socket:setopts(Transport, Socket, [{active, false}]), + case Transport:recv(Socket, 0, 0) of + {error, closed} -> + ok; + {ok, Data} -> + handle_close_alert(Data, StateName, State) + end. + +handle_close_alert(Data, StateName, State0) -> + case next_tls_record(Data, State0) of + {#ssl_tls{type = ?ALERT, fragment = EncAlerts}, State} -> + [Alert|_] = decode_alerts(EncAlerts), + handle_normal_shutdown(Alert, StateName, State); + _ -> + ok + end. + +select_curve(#state{client_ecc = {[Curve|_], _}}) -> + {namedCurve, Curve}; +select_curve(_) -> + {namedCurve, ?secp256k1}. |