%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2010. 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(ssl_connection).
-behaviour(gen_fsm).
-include("ssl_debug.hrl").
-include("ssl_handshake.hrl").
-include("ssl_alert.hrl").
-include("ssl_record.hrl").
-include("ssl_cipher.hrl").
-include("ssl_internal.hrl").
-include("ssl_int.hrl").
-include_lib("public_key/include/public_key.hrl").
%% Internal application API
-export([send/2, send/3, recv/3, connect/7, accept/6, close/1, shutdown/2,
new_user/2, get_opts/2, set_opts/2, info/1, session_info/1,
peer_certificate/1, sockname/1, peername/1, renegotiation/1]).
%% Called by ssl_connection_sup
-export([start_link/7]).
%% gen_fsm callbacks
-export([init/1, hello/2, certify/2, cipher/2, connection/2,
abbreviated/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
host, % string() | ipadress()
port, % integer()
socket, % socket()
ssl_options, % #ssl_options{}
socket_options, % #socket_options{}
connection_states, % #connection_states{} from ssl_record.hrl
tls_record_buffer, % binary() buffer of incomplete records
tls_handshake_buffer, % binary() buffer of incomplete handshakes
%% {{md5_hash, sha_hash}, {prev_md5, prev_sha}} (binary())
tls_handshake_hashes, % see above
tls_cipher_texts, % list() received but not deciphered yet
own_cert, % binary()
session, % #session{} from ssl_handshake.erl
session_cache, %
session_cache_cb, %
negotiated_version, % #protocol_version{}
supported_protocol_versions, % [atom()]
client_certificate_requested = false,
key_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}
premaster_secret, %
cert_db_ref, % ets_table()
from, % term(), where to reply
bytes_to_read, % integer(), # bytes to read in passive mode
user_data_buffer, % binary()
%% tls_buffer, % Keeps a lookahead one packet if available
log_alert, % boolean()
renegotiation, % {boolean(), From | internal | peer}
recv_during_renegotiation, %boolean()
send_queue % queue()
}).
-define(DEFAULT_DIFFIE_HELLMAN_PARAMS,
#'DHParameter'{prime = ?DEFAULT_DIFFIE_HELLMAN_PRIME,
base = ?DEFAULT_DIFFIE_HELLMAN_GENERATOR}).
%%====================================================================
%% Internal application API
%%====================================================================
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
send(Pid, Data) ->
sync_send_all_state_event(Pid, {application_data, erlang:iolist_to_binary(Data)}, infinity).
send(Pid, Data, Timeout) ->
sync_send_all_state_event(Pid, {application_data, erlang:iolist_to_binary(Data)}, Timeout).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
recv(Pid, Length, Timeout) ->
sync_send_all_state_event(Pid, {recv, Length}, Timeout).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
connect(Host, Port, Socket, Options, User, CbInfo, Timeout) ->
start_fsm(client, Host, Port, Socket, Options, User, CbInfo,
Timeout).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
accept(Port, Socket, Opts, User, CbInfo, Timeout) ->
start_fsm(server, "localhost", Port, Socket, Opts, User,
CbInfo, Timeout).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
close(ConnectionPid) ->
case sync_send_all_state_event(ConnectionPid, close) of
{error, closed} ->
ok;
Other ->
Other
end.
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
shutdown(ConnectionPid, How) ->
sync_send_all_state_event(ConnectionPid, {shutdown, How}).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
new_user(ConnectionPid, User) ->
sync_send_all_state_event(ConnectionPid, {new_user, User}).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
sockname(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, sockname).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
peername(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, peername).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
get_opts({ListenSocket, {_SslOpts, SockOpts}, _}, OptTags) ->
get_socket_opts(ListenSocket, OptTags, SockOpts, []);
get_opts(ConnectionPid, OptTags) ->
sync_send_all_state_event(ConnectionPid, {get_opts, OptTags}).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
set_opts(ConnectionPid, Options) ->
sync_send_all_state_event(ConnectionPid, {set_opts, Options}).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
info(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, info).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
session_info(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, session_info).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
peer_certificate(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, peer_certificate).
%%--------------------------------------------------------------------
%% Function:
%%
%% Description:
%%--------------------------------------------------------------------
renegotiation(ConnectionPid) ->
sync_send_all_state_event(ConnectionPid, renegotiate).
%%====================================================================
%% ssl_connection_sup API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%%
%% 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) ->
gen_fsm:start_link(?MODULE, [Role, Host, Port, Socket, Options,
User, CbInfo], []).
%%====================================================================
%% gen_fsm callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, StateName, State} |
%% {ok, StateName, State, Timeout} |
%% ignore |
%% {stop, StopReason}
%% Description:Whenever a gen_fsm is started using gen_fsm:start/[3,4] or
%% gen_fsm:start_link/3,4, this function is called by the new process to
%% initialize.
%%--------------------------------------------------------------------
init([Role, Host, Port, Socket, {SSLOpts, _} = Options,
User, CbInfo]) ->
State0 = initial_state(Role, Host, Port, Socket, Options, User, CbInfo),
Hashes0 = ssl_handshake:init_hashes(),
try ssl_init(SSLOpts, Role) of
{ok, Ref, CacheRef, OwnCert, Key, DHParams} ->
State = State0#state{tls_handshake_hashes = Hashes0,
own_cert = OwnCert,
cert_db_ref = Ref,
session_cache = CacheRef,
private_key = Key,
diffie_hellman_params = DHParams},
{ok, hello, State}
catch
throw:Error ->
{stop, Error}
end.
%%--------------------------------------------------------------------
%% Function:
%% state_name(Event, State) -> {next_state, NextStateName, NextState}|
%% {next_state, NextStateName,
%% NextState, Timeout} |
%% {stop, Reason, NewState}
%%
%% 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.
%%--------------------------------------------------------------------
hello(socket_control, #state{host = Host, port = Port, role = client,
ssl_options = SslOpts,
transport_cb = Transport, socket = Socket,
connection_states = ConnectionStates}
= State0) ->
Hello = ssl_handshake:client_hello(Host, Port,
ConnectionStates, SslOpts),
Version = Hello#client_hello.client_version,
Hashes0 = ssl_handshake:init_hashes(),
{BinMsg, CS2, Hashes1} =
encode_handshake(Hello, Version, ConnectionStates, Hashes0),
Transport:send(Socket, BinMsg),
State = State0#state{connection_states = CS2,
negotiated_version = Version, %% Requested version
session =
#session{session_id = Hello#client_hello.session_id,
is_resumable = false},
tls_handshake_hashes = Hashes1},
{next_state, hello, next_record(State)};
hello(socket_control, #state{role = server} = State) ->
{next_state, hello, next_record(State)};
hello(#hello_request{}, #state{role = client} = State) ->
{next_state, hello, State};
hello(#server_hello{cipher_suite = CipherSuite,
compression_method = Compression} = Hello,
#state{session = Session0 = #session{session_id = OldId},
connection_states = ConnectionStates0,
role = client,
negotiated_version = ReqVersion,
host = Host, port = Port,
session_cache = Cache,
session_cache_cb = CacheCb} = State0) ->
{Version, NewId, ConnectionStates1} =
ssl_handshake:hello(Hello, ConnectionStates0),
{KeyAlgorithm, _, _, _} =
ssl_cipher:suite_definition(CipherSuite),
PremasterSecret = make_premaster_secret(ReqVersion, KeyAlgorithm),
State = State0#state{key_algorithm = KeyAlgorithm,
negotiated_version = Version,
connection_states = ConnectionStates1,
premaster_secret = PremasterSecret},
case ssl_session:is_new(OldId, NewId) of
true ->
Session = Session0#session{session_id = NewId,
cipher_suite = CipherSuite,
compression_method = Compression},
{next_state, certify,
next_record(State#state{session = Session})};
false ->
Session = CacheCb:lookup(Cache, {{Host, Port}, NewId}),
case ssl_handshake:master_secret(Version, Session,
ConnectionStates1, client) of
{_, ConnectionStates2} ->
{next_state, abbreviated,
next_record(State#state{
connection_states = ConnectionStates2,
session = Session})};
#alert{} = Alert ->
handle_own_alert(Alert, Version, hello, State),
{stop, normal, State}
end
end;
hello(Hello = #client_hello{client_version = ClientVersion},
State = #state{connection_states = ConnectionStates0,
port = Port, session = Session0,
session_cache = Cache,
session_cache_cb = CacheCb,
ssl_options = SslOpts}) ->
case ssl_handshake:hello(Hello, {Port, SslOpts,
Session0, Cache, CacheCb,
ConnectionStates0}) of
{Version, {Type, Session}, ConnectionStates} ->
do_server_hello(Type, State#state{connection_states =
ConnectionStates,
negotiated_version = Version,
session = Session});
#alert{} = Alert ->
handle_own_alert(Alert, ClientVersion, hello, State),
{stop, normal, State}
end.
abbreviated(socket_control, #state{role = server} = State) ->
{next_state, abbreviated, State};
abbreviated(#hello_request{}, State) ->
{next_state, certify, State};
abbreviated(Finished = #finished{},
#state{role = server,
negotiated_version = Version,
tls_handshake_hashes = Hashes,
session = #session{master_secret = MasterSecret}} =
State0) ->
case ssl_handshake:verify_connection(Version, Finished, client,
MasterSecret, Hashes) of
verified ->
State = ack_connection(State0),
next_state_connection(State);
#alert{} = Alert ->
handle_own_alert(Alert, Version, abbreviated, State0),
{stop, normal, State0}
end;
abbreviated(Finished = #finished{},
#state{role = client, tls_handshake_hashes = Hashes0,
session = #session{master_secret = MasterSecret},
negotiated_version = Version} = State0) ->
case ssl_handshake:verify_connection(Version, Finished, server,
MasterSecret, Hashes0) of
verified ->
{ConnectionStates, Hashes} = finalize_client_handshake(State0),
State = ack_connection(State0),
next_state_connection(State#state{tls_handshake_hashes = Hashes,
connection_states =
ConnectionStates});
#alert{} = Alert ->
handle_own_alert(Alert, Version, abbreviated, State0),
{stop, normal, State0}
end.
certify(socket_control, #state{role = server} = State) ->
{next_state, certify, State};
certify(#hello_request{}, State) ->
{next_state, certify, 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_certificate, State),
{stop, normal, State};
certify(#certificate{asn1_certificates = []},
#state{role = server,
ssl_options = #ssl_options{verify = verify_peer,
fail_if_no_peer_cert = false}} =
State) ->
{next_state, certify,
next_record(State#state{client_certificate_requested = false})};
certify(#certificate{} = Cert,
#state{negotiated_version = Version,
role = Role,
cert_db_ref = CertDbRef,
ssl_options = Opts} = State) ->
case ssl_handshake:certify(Cert, CertDbRef, Opts#ssl_options.depth,
Opts#ssl_options.verify,
Opts#ssl_options.verify_fun,
Opts#ssl_options.validate_extensions_fun, Role) of
{PeerCert, PublicKeyInfo} ->
handle_peer_cert(PeerCert, PublicKeyInfo,
State#state{client_certificate_requested = false});
#alert{} = Alert ->
handle_own_alert(Alert, Version, certify_certificate, State),
{stop, normal, State}
end;
certify(#server_key_exchange{} = KeyExchangeMsg,
#state{role = client, negotiated_version = Version,
key_algorithm = Alg} = State0)
when Alg == dhe_dss; Alg == dhe_rsa ->%%Not imp:Alg == dh_anon;Alg == krb5 ->
case handle_server_key(KeyExchangeMsg, State0) of
#state{} = State ->
{next_state, certify, next_record(State)};
#alert{} = Alert ->
handle_own_alert(Alert, Version, certify_server_keyexchange,
State0),
{stop, normal, State0}
end;
certify(#server_key_exchange{},
State = #state{role = client, negotiated_version = Version,
key_algorithm = Alg})
when Alg == rsa; Alg == dh_dss; Alg == dh_rsa ->
Alert = ?ALERT_REC(?FATAL, ?UNEXPECTED_MESSAGE),
handle_own_alert(Alert, Version, certify_server_key_exchange, State),
{stop, normal, State};
certify(#certificate_request{}, State) ->
NewState = State#state{client_certificate_requested = true},
{next_state, certify, next_record(NewState)};
%% 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 ssl_handshake:master_secret(Version, Session,
ConnectionStates0, client) of
{MasterSecret, ConnectionStates1} ->
State = State0#state{connection_states = ConnectionStates1},
client_certify_and_key_exchange(State);
#alert{} = Alert ->
handle_own_alert(Alert, Version,
certify_server_hello_done, State0),
{stop, normal, 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 ssl_handshake:master_secret(Version, PremasterSecret,
ConnectionStates0, client) of
{MasterSecret, ConnectionStates1} ->
Session = Session0#session{master_secret = MasterSecret},
State = State0#state{connection_states = ConnectionStates1,
session = Session},
client_certify_and_key_exchange(State);
#alert{} = Alert ->
handle_own_alert(Alert, Version,
certify_server_hello_done, State0),
{stop, normal, State0}
end;
certify(#client_key_exchange{},
State = #state{role = server,
client_certificate_requested = true,
ssl_options = #ssl_options{fail_if_no_peer_cert = true},
negotiated_version = Version}) ->
%% We expect a certificate here
Alert = ?ALERT_REC(?FATAL, ?UNEXPECTED_MESSAGE),
handle_own_alert(Alert, Version,
certify_server_waiting_certificate, State),
{stop, normal, State};
certify(#client_key_exchange{exchange_keys
= #encrypted_premaster_secret{premaster_secret
= EncPMS}},
#state{negotiated_version = Version,
connection_states = ConnectionStates0,
session = Session0,
private_key = Key} = State0) ->
try ssl_handshake:decrypt_premaster_secret(EncPMS, Key) of
PremasterSecret ->
case ssl_handshake:master_secret(Version, PremasterSecret,
ConnectionStates0, server) of
{MasterSecret, ConnectionStates} ->
Session = Session0#session{master_secret = MasterSecret},
State = State0#state{connection_states = ConnectionStates,
session = Session},
{next_state, cipher, next_record(State)};
#alert{} = Alert ->
handle_own_alert(Alert, Version,
certify_client_key_exchange, State0),
{stop, normal, State0}
end
catch
#alert{} = Alert ->
handle_own_alert(Alert, Version, certify_client_key_exchange,
State0),
{stop, normal, State0}
end;
certify(#client_key_exchange{exchange_keys = #client_diffie_hellman_public{
dh_public = ClientPublicDhKey}},
#state{negotiated_version = Version,
diffie_hellman_params = #'DHParameter'{prime = P,
base = G},
diffie_hellman_keys = {_, ServerDhPrivateKey},
role = Role,
session = Session,
connection_states = ConnectionStates0} = State0) ->
PMpint = crypto:mpint(P),
GMpint = crypto:mpint(G),
PremasterSecret = crypto:dh_compute_key(mpint_binary(ClientPublicDhKey),
ServerDhPrivateKey,
[PMpint, GMpint]),
case ssl_handshake:master_secret(Version, PremasterSecret,
ConnectionStates0, Role) of
{MasterSecret, ConnectionStates} ->
State = State0#state{session =
Session#session{master_secret
= MasterSecret},
connection_states = ConnectionStates},
{next_state, cipher, next_record(State)};
#alert{} = Alert ->
handle_own_alert(Alert, Version,
certify_client_key_exchange, State0),
{stop, normal, State0}
end.
cipher(socket_control, #state{role = server} = State) ->
{next_state, cipher, State};
cipher(#hello_request{}, State) ->
{next_state, cipher, State};
cipher(#certificate_verify{signature = Signature},
#state{role = server,
public_key_info = PublicKeyInfo,
negotiated_version = Version,
session = #session{master_secret = MasterSecret},
key_algorithm = Algorithm,
tls_handshake_hashes = Hashes
} = State) ->
case ssl_handshake:certificate_verify(Signature, PublicKeyInfo,
Version, MasterSecret,
Algorithm, Hashes) of
valid ->
{next_state, cipher, next_record(State)};
#alert{} = Alert ->
handle_own_alert(Alert, Version, cipher, State),
{stop, normal, State}
end;
cipher(#finished{} = Finished,
#state{negotiated_version = Version,
host = Host,
port = Port,
role = Role,
session = #session{master_secret = MasterSecret}
= Session0,
tls_handshake_hashes = Hashes} = State0) ->
case ssl_handshake:verify_connection(Version, Finished,
opposite_role(Role),
MasterSecret, Hashes) of
verified ->
State = ack_connection(State0),
Session = register_session(Role, Host, Port, Session0),
case Role of
client ->
next_state_connection(State#state{session = Session});
server ->
{NewConnectionStates, NewHashes} =
finalize_server_handshake(State#state{
session = Session}),
next_state_connection(State#state{connection_states =
NewConnectionStates,
session = Session,
tls_handshake_hashes =
NewHashes})
end;
#alert{} = Alert ->
handle_own_alert(Alert, Version, cipher, State0),
{stop, normal, State0}
end.
connection(socket_control, #state{role = server} = State) ->
{next_state, connection, State};
connection(#hello_request{}, State = #state{host = Host, port = Port,
socket = Socket,
ssl_options = SslOpts,
negotiated_version = Version,
transport_cb = Transport,
connection_states = ConnectionStates0,
tls_handshake_hashes = Hashes0}) ->
Hello = ssl_handshake:client_hello(Host, Port,
ConnectionStates0, SslOpts),
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(Hello, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
{next_state, hello, next_record(State#state{connection_states =
ConnectionStates1,
tls_handshake_hashes = Hashes1})};
connection(#client_hello{} = Hello, #state{role = server} = State) ->
hello(Hello, State).
%%--------------------------------------------------------------------
%% Function:
%% handle_event(Event, StateName, State) -> {next_state, NextStateName,
%% NextState} |
%% {next_state, NextStateName,
%% NextState, Timeout} |
%% {stop, Reason, NewState}
%% 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.
%%--------------------------------------------------------------------
handle_event(#ssl_tls{type = ?HANDSHAKE, fragment = Data},
StateName,
State0 = #state{key_algorithm = KeyAlg,
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 = ssl_handshake:init_hashes(),
?MODULE:SName(Packet, State#state{tls_handshake_hashes=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}) ->
Hs0 = ssl_handshake:init_hashes(),
Hs1 = ssl_handshake:update_hashes(Hs0, Raw),
?MODULE:SName(Packet, State#state{tls_handshake_hashes=Hs1,
renegotiation = {true, peer}});
({Packet, Raw}, {next_state, SName, State = #state{tls_handshake_hashes=Hs0}}) ->
Hs1 = ssl_handshake:update_hashes(Hs0, Raw),
?MODULE:SName(Packet, State#state{tls_handshake_hashes=Hs1});
(_, StopState) -> StopState
end,
try
{Packets, Buf} = ssl_handshake:get_tls_handshake(Data,Buf0, KeyAlg,Version),
Start = {next_state, StateName, State0#state{tls_handshake_buffer = Buf}},
lists:foldl(Handle, Start, Packets)
catch throw:#alert{} = Alert ->
handle_own_alert(Alert, Version, StateName, State0),
{stop, normal, State0}
end;
handle_event(#ssl_tls{type = ?APPLICATION_DATA, fragment = Data},
StateName, State0) ->
case application_data(Data, State0) of
Stop = {stop,_,_} ->
Stop;
State ->
{next_state, StateName, State}
end;
handle_event(#ssl_tls{type = ?CHANGE_CIPHER_SPEC, fragment = <<1>>} =
_ChangeCipher,
StateName,
State = #state{connection_states = ConnectionStates0}) ->
?DBG_TERM(_ChangeCipher),
ConnectionStates1 =
ssl_record:activate_pending_connection_state(ConnectionStates0, read),
{next_state, StateName,
next_record(State#state{connection_states = ConnectionStates1})};
handle_event(#ssl_tls{type = ?ALERT, fragment = Data}, StateName, State) ->
Alerts = decode_alerts(Data),
?DBG_TERM(Alerts),
[alert_event(A) || A <- Alerts],
{next_state, StateName, State};
handle_event(#alert{level = ?FATAL} = Alert, connection,
#state{from = From, user_application = {_Mon, Pid},
log_alert = Log,
host = Host, port = Port, session = Session,
role = Role, socket_options = Opts} = State) ->
invalidate_session(Role, Host, Port, Session),
log_alert(Log, connection, Alert),
alert_user(Opts#socket_options.active, Pid, From, Alert, Role),
{stop, normal, State};
handle_event(#alert{level = ?WARNING, description = ?CLOSE_NOTIFY} = Alert,
connection, #state{from = From,
role = Role,
user_application = {_Mon, Pid},
socket_options = Opts} = State) ->
alert_user(Opts#socket_options.active, Pid, From, Alert, Role),
{stop, normal, State};
handle_event(#alert{level = ?FATAL} = Alert, StateName,
#state{from = From, host = Host, port = Port, session = Session,
log_alert = Log, role = Role} = State) ->
invalidate_session(Role, Host, Port, Session),
log_alert(Log, StateName, Alert),
alert_user(From, Alert, Role),
{stop, normal, State};
handle_event(#alert{level = ?WARNING, description = ?CLOSE_NOTIFY} = Alert,
_, #state{from = From, role = Role} = State) ->
alert_user(From, Alert, Role),
{stop, normal, State};
handle_event(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName,
#state{log_alert = Log, renegotiation = {true, internal}} = State) ->
log_alert(Log, StateName, Alert),
{stop, normal, State};
handle_event(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName,
#state{log_alert = Log, renegotiation = {true, From}} = State) ->
log_alert(Log, StateName, Alert),
gen_fsm:reply(From, {error, renegotiation_rejected}),
{next_state, connection, next_record(State)};
handle_event(#alert{level = ?WARNING, description = ?USER_CANCELED} = Alert, StateName,
#state{log_alert = Log} = State) ->
log_alert(Log, StateName, Alert),
{next_state, StateName, next_record(State)}.
%%--------------------------------------------------------------------
%% Function:
%% handle_sync_event(Event, From, StateName,
%% State) -> {next_state, NextStateName, NextState} |
%% {next_state, NextStateName, NextState,
%% Timeout} |
%% {reply, Reply, NextStateName, NextState}|
%% {reply, Reply, NextStateName, NextState,
%% Timeout} |
%% {stop, Reason, NewState} |
%% {stop, Reason, Reply, NewState}
%% 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, Data0}, From, connection,
#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) ->
%% 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
Data = encode_packet(Data0, SockOpts),
case encode_data(Data, Version, ConnectionStates0, RenegotiateAt) of
{Msgs, [], ConnectionStates} ->
Result = Transport:send(Socket, Msgs),
{reply, Result,
connection, State#state{connection_states = ConnectionStates}};
{Msgs, RestData, ConnectionStates} ->
if
Msgs =/= [] ->
Transport:send(Socket, Msgs);
true ->
ok
end,
renegotiate(State#state{connection_states = ConnectionStates,
send_queue = queue:in_r({From, RestData}, SendQueue),
renegotiation = {true, internal}})
end
catch throw:Error ->
{reply, Error, connection, 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)}};
handle_sync_event(started, From, StateName, State) ->
{next_state, StateName, State#state{from = From}};
handle_sync_event(close, From, _StateName, State) ->
{stop, normal, ok, State#state{from = From}};
handle_sync_event({shutdown, How}, From, StateName,
#state{transport_cb = CbModule,
socket = Socket} = State) ->
case CbModule:shutdown(Socket, How) of
ok ->
{reply, ok, StateName, State};
Error ->
{stop, normal, Error, State#state{from = From}}
end;
handle_sync_event({recv, N}, From, connection = StateName, State0) ->
passive_receive(State0#state{bytes_to_read = N, from = From}, StateName);
%% Doing renegotiate wait with handling request until renegotiate is
%% finished. Will be handled by next_state_connection/1.
handle_sync_event({recv, N}, From, StateName, State) ->
{next_state, StateName, State#state{bytes_to_read = N, from = From,
recv_during_renegotiation = true}};
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}}};
handle_sync_event({get_opts, OptTags}, _From, StateName,
#state{socket = Socket,
socket_options = SockOpts} = State) ->
OptsReply = get_socket_opts(Socket, OptTags, SockOpts, []),
{reply, OptsReply, StateName, State};
handle_sync_event(sockname, _From, StateName,
#state{socket = Socket} = State) ->
SockNameReply = inet:sockname(Socket),
{reply, SockNameReply, StateName, State};
handle_sync_event(peername, _From, StateName,
#state{socket = Socket} = State) ->
PeerNameReply = inet:peername(Socket),
{reply, PeerNameReply, StateName, State};
handle_sync_event({set_opts, Opts0}, _From, StateName,
#state{socket_options = Opts1,
socket = Socket,
user_data_buffer = Buffer} = State0) ->
Opts = set_socket_opts(Socket, Opts0, Opts1, []),
State1 = State0#state{socket_options = Opts},
if
Opts#socket_options.active =:= false ->
{reply, ok, StateName, State1};
Buffer =:= <<>>, Opts1#socket_options.active =:= false ->
%% Need data, set active once
{reply, ok, StateName, next_record_if_active(State1)};
Buffer =:= <<>> ->
%% Active once already set
{reply, ok, StateName, State1};
true ->
case application_data(<<>>, State1) of
Stop = {stop,_,_} ->
Stop;
State ->
{reply, ok, StateName, State}
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};
handle_sync_event(info, _, StateName,
#state{negotiated_version = Version,
session = #session{cipher_suite = Suite}} = State) ->
AtomVersion = ssl_record:protocol_version(Version),
{reply, {ok, {AtomVersion, ssl_cipher:suite_definition(Suite)}},
StateName, State};
handle_sync_event(session_info, _, StateName,
#state{session = #session{session_id = Id,
cipher_suite = Suite}} = State) ->
{reply, [{session_id, Id},
{cipher_suite, ssl_cipher:suite_definition(Suite)}],
StateName, State};
handle_sync_event(peer_certificate, _, StateName,
#state{session = #session{peer_certificate = Cert}}
= State) ->
{reply, {ok, Cert}, StateName, State}.
%%--------------------------------------------------------------------
%% Function:
%% handle_info(Info,StateName,State)-> {next_state, NextStateName, NextState}|
%% {next_state, NextStateName, NextState,
%% Timeout} |
%% {stop, Reason, NewState}
%% 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 =
#state{data_tag = Protocol,
negotiated_version = Version,
tls_record_buffer = Buf0,
tls_cipher_texts = CT0}) ->
case ssl_record:get_tls_records(Data, Buf0) of
{Records, Buf1} ->
CT1 = CT0 ++ Records,
{next_state, StateName,
next_record(State#state{tls_record_buffer = Buf1,
tls_cipher_texts = CT1})};
#alert{} = Alert ->
handle_own_alert(Alert, Version, StateName, State),
{stop, normal, State}
end;
handle_info({CloseTag, Socket}, _StateName,
#state{socket = Socket, close_tag = CloseTag,
negotiated_version = Version, host = Host,
port = Port, socket_options = Opts,
user_application = {_Mon,Pid}, from = From,
role = Role, session = Session} = State) ->
%% Debug option maybe, the user do NOT want to see these in their logs
%% error_logger:info_report("SSL: Peer did not send close notify alert."),
case Version of
{1, N} when N >= 1 ->
ok;
_ ->
invalidate_session(Role, Host, Port, Session)
end,
alert_user(Opts#socket_options.active, Pid, From,
?ALERT_REC(?WARNING, ?CLOSE_NOTIFY), Role),
{stop, normal, State};
handle_info({'DOWN', MonitorRef, _, _, _}, _,
State = #state{user_application={MonitorRef,_Pid}}) ->
{stop, normal, State};
handle_info(A, StateName, State) ->
io:format("SSL: Bad info (state ~w): ~w\n", [StateName, A]),
{stop, bad_info, State}.
%%--------------------------------------------------------------------
%% Function: terminate(Reason, StateName, State) -> void()
%% 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(_Reason, connection, #state{negotiated_version = Version,
connection_states = ConnectionStates,
transport_cb = Transport,
socket = Socket, send_queue = SendQueue,
renegotiation = Renegotiate}) ->
notify_senders(SendQueue),
notify_renegotiater(Renegotiate),
{BinAlert, _} = encode_alert(?ALERT_REC(?WARNING,?CLOSE_NOTIFY),
Version, ConnectionStates),
Transport:send(Socket, BinAlert),
Transport:close(Socket);
terminate(_Reason, _StateName, #state{transport_cb = Transport,
socket = Socket, send_queue = SendQueue,
renegotiation = Renegotiate}) ->
notify_senders(SendQueue),
notify_renegotiater(Renegotiate),
Transport:close(Socket).
%%--------------------------------------------------------------------
%% Function:
%% 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, Opts, User, {CbModule, _,_} = CbInfo,
Timeout) ->
case ssl_connection_sup:start_child([Role, Host, Port, Socket,
Opts, User, CbInfo]) of
{ok, Pid} ->
CbModule:controlling_process(Socket, Pid),
send_event(Pid, socket_control),
case sync_send_all_state_event(Pid, started, Timeout) of
connected ->
{ok, sslsocket(Pid)};
{error, Reason} ->
{error, Reason}
end;
{error, Reason} ->
{error, Reason}
end.
ssl_init(SslOpts, Role) ->
{ok, CertDbRef, CacheRef, OwnCert} = init_certificates(SslOpts, Role),
PrivateKey =
init_private_key(SslOpts#ssl_options.key, SslOpts#ssl_options.keyfile,
SslOpts#ssl_options.password, Role),
DHParams = init_diffie_hellman(SslOpts#ssl_options.dhfile, Role),
{ok, CertDbRef, CacheRef, OwnCert, PrivateKey, DHParams}.
init_certificates(#ssl_options{cacertfile = CACertFile,
certfile = CertFile}, Role) ->
case ssl_manager:connection_init(CACertFile, Role) of
{ok, CertDbRef, CacheRef} ->
init_certificates(CertDbRef, CacheRef, CertFile, Role);
{error, {badmatch, _Error}} ->
Report = io_lib:format("SSL: Error ~p Initializing: ~p ~n",
[_Error, CACertFile]),
error_logger:error_report(Report),
throw(ecacertfile);
{error, _Error} ->
Report = io_lib:format("SSL: Error ~p Initializing: ~p ~n",
[_Error, CACertFile]),
error_logger:error_report(Report),
throw(ecacertfile)
end.
init_certificates(CertDbRef, CacheRef, CertFile, client) ->
try
[OwnCert] = ssl_certificate:file_to_certificats(CertFile),
{ok, CertDbRef, CacheRef, OwnCert}
catch _E:_R ->
{ok, CertDbRef, CacheRef, undefined}
end;
init_certificates(CertDbRef, CacheRef, CertFile, server) ->
try
[OwnCert] = ssl_certificate:file_to_certificats(CertFile),
{ok, CertDbRef, CacheRef, OwnCert}
catch
_E:{badmatch, _R={error,_}} ->
Report = io_lib:format("SSL: ~p: ~p:~p ~s~n ~p~n",
[?LINE, _E,_R, CertFile,
erlang:get_stacktrace()]),
error_logger:error_report(Report),
throw(ecertfile);
_E:_R ->
Report = io_lib:format("SSL: ~p: ~p:~p ~s~n ~p~n",
[?LINE, _E,_R, CertFile,
erlang:get_stacktrace()]),
error_logger:error_report(Report),
throw(ecertfile)
end.
init_private_key(undefined, "", _Password, client) ->
undefined;
init_private_key(undefined, KeyFile, Password, _) ->
try
{ok, List} = ssl_manager:cache_pem_file(KeyFile),
[Der] = [Der || Der = {PKey, _ , _} <- List,
PKey =:= rsa_private_key orelse
PKey =:= dsa_private_key],
{ok, Decoded} = public_key:decode_private_key(Der,Password),
Decoded
catch
_E:{badmatch, _R={error,_}} ->
Report = io_lib:format("SSL: ~p: ~p:~p ~s~n ~p~n",
[?LINE, _E,_R, KeyFile,
erlang:get_stacktrace()]),
error_logger:error_report(Report),
throw(ekeyfile);
_E:_R ->
Report = io_lib:format("SSL: ~p: ~p:~p ~s~n ~p~n",
[?LINE, _E,_R, KeyFile,
erlang:get_stacktrace()]),
error_logger:error_report(Report),
throw(ekeyfile)
end;
init_private_key(PrivateKey, _, _,_) ->
PrivateKey.
init_diffie_hellman(_, client) ->
undefined;
init_diffie_hellman(undefined, _) ->
?DEFAULT_DIFFIE_HELLMAN_PARAMS;
init_diffie_hellman(DHParamFile, server) ->
{ok, List} = ssl_manager:cache_pem_file(DHParamFile),
case [Der || Der = {dh_params, _ , _} <- List] of
[Der] ->
{ok, Decoded} = public_key:decode_dhparams(Der),
Decoded;
[] ->
?DEFAULT_DIFFIE_HELLMAN_PARAMS
end.
send_event(FsmPid, Event) ->
gen_fsm:send_event(FsmPid, Event).
send_all_state_event(FsmPid, Event) ->
gen_fsm:send_all_state_event(FsmPid, Event).
sync_send_all_state_event(FsmPid, Event) ->
sync_send_all_state_event(FsmPid, Event, ?DEFAULT_TIMEOUT).
sync_send_all_state_event(FsmPid, Event, Timeout) ->
try gen_fsm:sync_send_all_state_event(FsmPid, Event, Timeout)
catch
exit:{noproc, _} ->
{error, closed};
exit:{timeout, _} ->
{error, timeout};
exit:{normal, _} ->
{error, closed}
end.
%% Events: #alert{}
alert_event(Alert) ->
send_all_state_event(self(), Alert).
%% 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) ->
State = State0#state{session =
Session#session{peer_certificate = PeerCert},
public_key_info = PublicKeyInfo},
{next_state, certify, next_record(State)}.
certify_client(#state{client_certificate_requested = true, role = client,
connection_states = ConnectionStates0,
transport_cb = Transport,
negotiated_version = Version,
cert_db_ref = CertDbRef,
own_cert = OwnCert,
socket = Socket,
tls_handshake_hashes = Hashes0} = State) ->
Certificate = ssl_handshake:certificate(OwnCert, CertDbRef, client),
{BinCert, ConnectionStates1, Hashes1} =
encode_handshake(Certificate, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinCert),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1};
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,
own_cert = OwnCert,
socket = Socket,
key_algorithm = KeyAlg,
private_key = PrivateKey,
session = #session{master_secret = MasterSecret},
tls_handshake_hashes = Hashes0} = State) ->
case ssl_handshake:client_certificate_verify(OwnCert, MasterSecret,
Version, KeyAlg,
PrivateKey, Hashes0) of
ignore -> %% No key or cert or fixed_diffie_hellman
State;
Verified ->
{BinVerified, ConnectionStates1, Hashes1} =
encode_handshake(Verified, KeyAlg, Version,
ConnectionStates0, Hashes0),
Transport:send(Socket, BinVerified),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1}
end;
verify_client_cert(#state{client_certificate_requested = false} = State) ->
State.
do_server_hello(Type, #state{negotiated_version = Version,
session = Session,
connection_states = ConnectionStates0}
= State0) when is_atom(Type) ->
ServerHello =
ssl_handshake:server_hello(Session#session.session_id, Version,
ConnectionStates0),
State = server_hello(ServerHello, State0),
case Type of
new ->
do_server_hello(ServerHello, State);
resumed ->
case ssl_handshake:master_secret(Version, Session,
ConnectionStates0, server) of
{_, ConnectionStates1} ->
State1 = State#state{connection_states=ConnectionStates1,
session = Session},
{ConnectionStates, Hashes} =
finalize_server_handshake(State1),
Resumed = State1#state{connection_states =
ConnectionStates,
tls_handshake_hashes = Hashes},
{next_state, abbreviated, next_record(Resumed)};
#alert{} = Alert ->
handle_own_alert(Alert, Version, hello, State),
{stop, normal, State}
end
end;
do_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 ->
State = server_hello_done(State1),
Session =
Session0#session{session_id = SessionId,
cipher_suite = CipherSuite,
compression_method = Compression},
{next_state, certify, State#state{session = Session}}
catch
#alert{} = Alert ->
handle_own_alert(Alert, Version, hello, State0),
{stop, normal, State0}
end.
client_certify_and_key_exchange(#state{negotiated_version = Version} =
State0) ->
try do_client_certify_and_key_exchange(State0) of
State1 = #state{} ->
{ConnectionStates, Hashes} = finalize_client_handshake(State1),
State = State1#state{connection_states = ConnectionStates,
%% Reinitialize
client_certificate_requested = false,
tls_handshake_hashes = Hashes},
{next_state, cipher, next_record(State)}
catch
#alert{} = Alert ->
handle_own_alert(Alert, Version, certify_foo, State0),
{stop, normal, 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_hashes = Hashes0} = State) ->
CipherSuite = ServerHello#server_hello.cipher_suite,
{KeyAlgorithm, _, _, _} = ssl_cipher:suite_definition(CipherSuite),
%% Version = ServerHello#server_hello.server_version, TODO ska kontrolleras
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(ServerHello, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1,
key_algorithm = KeyAlgorithm}.
server_hello_done(#state{transport_cb = Transport,
socket = Socket,
negotiated_version = Version,
connection_states = ConnectionStates,
tls_handshake_hashes = Hashes} = State0) ->
HelloDone = ssl_handshake:server_hello_done(),
{BinHelloDone, NewConnectionStates, NewHashes} =
encode_handshake(HelloDone, Version, ConnectionStates, Hashes),
Transport:send(Socket, BinHelloDone),
State = State0#state{connection_states = NewConnectionStates,
tls_handshake_hashes = NewHashes},
next_record(State).
certify_server(#state{transport_cb = Transport,
socket = Socket,
negotiated_version = Version,
connection_states = ConnectionStates,
tls_handshake_hashes = Hashes,
cert_db_ref = CertDbRef,
own_cert = OwnCert} = State) ->
case ssl_handshake:certificate(OwnCert, CertDbRef, server) of
CertMsg = #certificate{} ->
{BinCertMsg, NewConnectionStates, NewHashes} =
encode_handshake(CertMsg, Version, ConnectionStates, Hashes),
Transport:send(Socket, BinCertMsg),
State#state{connection_states = NewConnectionStates,
tls_handshake_hashes = NewHashes
};
Alert = #alert{} ->
throw(Alert)
end.
key_exchange(#state{role = server, key_algorithm = Algo} = State)
when Algo == rsa;
Algo == dh_dss;
Algo == dh_rsa ->
State;
%key_exchange(#state{role = server, key_algorithm = rsa_export} = State) ->
%% TODO when the public key in the server certificate is
%% less than or equal to 512 bits in length dont send key_exchange
%% but do it otherwise
% State;
key_exchange(#state{role = server, key_algorithm = Algo,
diffie_hellman_params = Params,
private_key = PrivateKey,
connection_states = ConnectionStates0,
negotiated_version = Version,
tls_handshake_hashes = Hashes0,
socket = Socket,
transport_cb = Transport
} = State)
when Algo == dhe_dss;
Algo == dhe_dss_export;
Algo == dhe_rsa;
Algo == dhe_rsa_export ->
Keys = public_key:gen_key(Params),
ConnectionState =
ssl_record:pending_connection_state(ConnectionStates0, read),
SecParams = ConnectionState#connection_state.security_parameters,
#security_parameters{client_random = ClientRandom,
server_random = ServerRandom} = SecParams,
Msg = ssl_handshake:key_exchange(server, {dh, Keys, Params,
Algo, ClientRandom,
ServerRandom,
PrivateKey}),
{BinMsg, ConnectionStates, Hashes1} =
encode_handshake(Msg, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{connection_states = ConnectionStates,
diffie_hellman_keys = Keys,
tls_handshake_hashes = Hashes1};
%% key_algorithm = dh_anon is not supported. Should be by default disabled
%% if support is implemented and then we need a key_exchange clause for it
%% here.
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_hashes = Hashes0} = State) ->
Msg = rsa_key_exchange(PremasterSecret, PublicKeyInfo),
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(Msg, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1};
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_hashes = Hashes0} = State)
when Algorithm == dhe_dss;
Algorithm == dhe_dss_export;
Algorithm == dhe_rsa;
Algorithm == dhe_rsa_export ->
Msg = ssl_handshake:key_exchange(client, {dh, DhPubKey}),
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(Msg, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1};
key_exchange(#state{role = client,
connection_states = ConnectionStates0,
key_algorithm = Algorithm,
negotiated_version = Version,
client_certificate_requested = ClientCertReq,
own_cert = OwnCert,
diffie_hellman_keys = DhKeys,
socket = Socket, transport_cb = Transport,
tls_handshake_hashes = Hashes0} = State)
when Algorithm == dh_dss;
Algorithm == dh_rsa ->
Msg = dh_key_exchange(OwnCert, DhKeys, ClientCertReq),
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(Msg, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1}.
rsa_key_exchange(PremasterSecret, PublicKeyInfo = {Algorithm, _, _})
when Algorithm == ?rsaEncryption;
Algorithm == ?md2WithRSAEncryption;
Algorithm == ?md5WithRSAEncryption;
Algorithm == ?sha1WithRSAEncryption ->
ssl_handshake:key_exchange(client,
{premaster_secret, PremasterSecret,
PublicKeyInfo});
rsa_key_exchange(_, _) ->
throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE)).
dh_key_exchange(OwnCert, DhKeys, true) ->
case public_key:pkix_is_fixed_dh_cert(OwnCert) of
true ->
ssl_handshake:key_exchange(client, fixed_diffie_hellman);
false ->
{DhPubKey, _} = DhKeys,
ssl_handshake:key_exchange(client, {dh, DhPubKey})
end;
dh_key_exchange(_, {DhPubKey, _}, false) ->
ssl_handshake:key_exchange(client, {dh, DhPubKey}).
request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer},
connection_states = ConnectionStates0,
cert_db_ref = CertDbRef,
tls_handshake_hashes = Hashes0,
negotiated_version = Version,
socket = Socket,
transport_cb = Transport} = State) ->
Msg = ssl_handshake:certificate_request(ConnectionStates0, CertDbRef),
{BinMsg, ConnectionStates1, Hashes1} =
encode_handshake(Msg, Version, ConnectionStates0, Hashes0),
Transport:send(Socket, BinMsg),
State#state{client_certificate_requested = true,
connection_states = ConnectionStates1,
tls_handshake_hashes = Hashes1};
request_client_cert(#state{ssl_options = #ssl_options{verify = verify_none}} =
State) ->
State.
finalize_client_handshake(#state{connection_states = ConnectionStates0}
= State) ->
ConnectionStates1 =
cipher_protocol(State#state{connection_states =
ConnectionStates0}),
ConnectionStates2 =
ssl_record:activate_pending_connection_state(ConnectionStates1,
write),
finished(State#state{connection_states = ConnectionStates2}).
finalize_server_handshake(State) ->
ConnectionStates0 = cipher_protocol(State),
ConnectionStates =
ssl_record:activate_pending_connection_state(ConnectionStates0,
write),
finished(State#state{connection_states = ConnectionStates}).
cipher_protocol(#state{connection_states = ConnectionStates,
socket = Socket,
negotiated_version = Version,
transport_cb = Transport}) ->
{BinChangeCipher, NewConnectionStates} =
encode_change_cipher(#change_cipher_spec{},
Version, ConnectionStates),
Transport:send(Socket, BinChangeCipher),
NewConnectionStates.
finished(#state{role = Role, socket = Socket, negotiated_version = Version,
transport_cb = Transport,
session = Session,
connection_states = ConnectionStates,
tls_handshake_hashes = Hashes}) ->
MasterSecret = Session#session.master_secret,
Finished = ssl_handshake:finished(Version, Role, MasterSecret, Hashes),
{BinFinished, NewConnectionStates, NewHashes} =
encode_handshake(Finished, Version, ConnectionStates, Hashes),
Transport:send(Socket, BinFinished),
{NewConnectionStates, NewHashes}.
handle_server_key(
#server_key_exchange{params =
#server_dh_params{dh_p = P,
dh_g = G,
dh_y = ServerPublicDhKey},
signed_params = Signed},
#state{session = Session, negotiated_version = Version, role = Role,
public_key_info = PubKeyInfo,
key_algorithm = KeyAlgo,
connection_states = ConnectionStates0} = State) ->
PLen = size(P),
GLen = size(G),
YLen = size(ServerPublicDhKey),
ConnectionState =
ssl_record:pending_connection_state(ConnectionStates0, read),
SecParams = ConnectionState#connection_state.security_parameters,
#security_parameters{client_random = ClientRandom,
server_random = ServerRandom} = SecParams,
Hash = ssl_handshake:server_key_exchange_hash(KeyAlgo,
<<ClientRandom/binary,
ServerRandom/binary,
?UINT16(PLen), P/binary,
?UINT16(GLen), G/binary,
?UINT16(YLen),
ServerPublicDhKey/binary>>),
case verify_dh_params(Signed, Hash, PubKeyInfo) of
true ->
PMpint = mpint_binary(P),
GMpint = mpint_binary(G),
Keys = {_, ClientDhPrivateKey} =
crypto:dh_generate_key([PMpint,GMpint]),
PremasterSecret =
crypto:dh_compute_key(mpint_binary(ServerPublicDhKey),
ClientDhPrivateKey, [PMpint, GMpint]),
case ssl_handshake:master_secret(Version, PremasterSecret,
ConnectionStates0, Role) of
{MasterSecret, ConnectionStates} ->
State#state{diffie_hellman_keys = Keys,
session =
Session#session{master_secret
= MasterSecret},
connection_states = ConnectionStates};
#alert{} = Alert ->
Alert
end;
false ->
?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE)
end.
verify_dh_params(Signed, Hash, {?rsaEncryption, PubKey, _PubKeyparams}) ->
case public_key:decrypt_public(Signed, PubKey,
[{rsa_pad, rsa_pkcs1_padding}]) of
Hash ->
true;
_ ->
false
end.
encode_alert(#alert{} = Alert, Version, ConnectionStates) ->
?DBG_TERM(Alert),
ssl_record:encode_alert_record(Alert, Version, ConnectionStates).
encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
?DBG_TERM(#change_cipher_spec{}),
ssl_record:encode_change_cipher_spec(Version, ConnectionStates).
encode_handshake(HandshakeRec, Version, ConnectionStates, Hashes) ->
encode_handshake(HandshakeRec, undefined, Version,
ConnectionStates, Hashes).
encode_handshake(HandshakeRec, SigAlg, Version, ConnectionStates0, Hashes0) ->
?DBG_TERM(HandshakeRec),
Frag = ssl_handshake:encode_handshake(HandshakeRec, Version, SigAlg),
Hashes1 = ssl_handshake:update_hashes(Hashes0, Frag),
{E, ConnectionStates1} =
ssl_record:encode_handshake(Frag, Version, ConnectionStates0),
{E, ConnectionStates1, Hashes1}.
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 = byte_size(Bin),
case Len > Max of
true -> throw({error, {badarg, {packet_to_large, Len, Max}}});
false -> <<Len:Size, Bin/binary>>
end.
encode_data(Data, Version, ConnectionStates, RenegotiateAt) ->
ssl_record:encode_data(Data, Version, ConnectionStates, RenegotiateAt).
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
<<>> ->
State = next_record(State0),
{next_state, StateName, State};
_ ->
case application_data(<<>>, State0) of
Stop = {stop, _, _} ->
Stop;
State ->
{next_state, StateName, State}
end
end.
application_data(Data, #state{user_application = {_Mon, Pid},
socket_options = SOpts,
bytes_to_read = BytesToRead,
from = From,
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, <<>>, Buffer} -> % no reply, we need more data
next_record(State0#state{user_data_buffer = Buffer});
{ok, ClientData, Buffer} -> % Send data
SocketOpt = deliver_app_data(SOpts, ClientData, Pid, From),
State = State0#state{user_data_buffer = Buffer,
from = undefined,
bytes_to_read = 0,
socket_options = SocketOpt
},
if
SocketOpt#socket_options.active =:= false ->
State; %% Passive mode, wait for active once or recv
Buffer =:= <<>> -> %% Active and empty, get more data
next_record(State);
true -> %% We have more data
application_data(<<>>, State)
end;
{error,_Reason} -> %% Invalid packet in packet mode
deliver_packet_error(SOpts, Buffer1, Pid, From),
{stop, normal, State0}
end.
%% Picks ClientData
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
{ok, <<>>, Buffer}
end;
get_data(#socket_options{packet=Type, packet_size=Size}, _, Buffer) ->
PacketOpts = [{packet_size, Size}],
case decode_packet(Type, Buffer, PacketOpts) of
{more, _} ->
{ok, <<>>, 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(SOpts = #socket_options{active=Active, packet=Type},
Data, Pid, From) ->
send_or_reply(Active, Pid, From, format_reply(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, header=Header}, Data) ->
{ok, format_reply(Mode, Header, Data)};
format_reply(#socket_options{active=_, mode=Mode, header=Header}, Data) ->
{ssl, sslsocket(), format_reply(Mode, Header, Data)}.
deliver_packet_error(SO= #socket_options{active=Active}, Data, Pid, From) ->
send_or_reply(Active, Pid, From, format_packet_error(SO, Data)).
format_packet_error(#socket_options{active=false, mode=Mode}, Data) ->
{error, {invalid_packet, format_reply(Mode, raw, Data)}};
format_packet_error(#socket_options{active=_, mode=Mode}, Data) ->
{ssl_error, sslsocket(), {invalid_packet, format_reply(Mode, raw, Data)}}.
format_reply(list, _, Data) -> binary_to_list(Data);
format_reply(binary, 0, Data) -> Data;
format_reply(binary, raw, Data) -> Data;
format_reply(binary, N, Data) -> % Header mode
<<Header:N/binary, Rest/binary>> = Data,
[binary_to_list(Header), Rest].
%% tcp_closed
send_or_reply(false, _Pid, undefined, _Data) ->
Report = io_lib:format("SSL(debug): Unexpected Data ~p ~n",[_Data]),
error_logger:error_report(Report),
erlang:error({badarg, _Pid, undefined, _Data}),
ok;
send_or_reply(false, _Pid, From, Data) ->
gen_fsm:reply(From, Data);
send_or_reply(_, Pid, _From, Data) ->
send_user(Pid, Data).
opposite_role(client) ->
server;
opposite_role(server) ->
client.
send_user(Pid, Msg) ->
Pid ! Msg.
next_record(#state{tls_cipher_texts = [], socket = Socket} = State) ->
inet:setopts(Socket, [{active,once}]),
State;
next_record(#state{tls_cipher_texts = [CT | Rest],
connection_states = ConnStates0} = State) ->
{Plain, ConnStates} = ssl_record:decode_cipher_text(CT, ConnStates0),
gen_fsm:send_all_state_event(self(), Plain),
State#state{tls_cipher_texts = Rest, connection_states = ConnStates}.
next_record_if_active(State =
#state{socket_options =
#socket_options{active = false}}) ->
State;
next_record_if_active(State) ->
next_record(State).
next_state_connection(#state{send_queue = Queue0,
negotiated_version = Version,
socket = Socket,
transport_cb = Transport,
connection_states = ConnectionStates0,
ssl_options = #ssl_options{renegotiate_at = RenegotiateAt}
} = State) ->
%% Send queued up data
case queue:out(Queue0) of
{{value, {From, Data}}, Queue} ->
case encode_data(Data, Version, ConnectionStates0, RenegotiateAt) of
{Msgs, [], ConnectionStates} ->
Result = Transport:send(Socket, Msgs),
gen_fsm:reply(From, Result),
next_state_connection(State#state{connection_states = ConnectionStates,
send_queue = Queue});
%% This is unlikely to happen. User configuration of the
%% undocumented test option renegotiation_at can make it more likely.
{Msgs, RestData, ConnectionStates} ->
if
Msgs =/= [] ->
Transport:send(Socket, Msgs);
true ->
ok
end,
renegotiate(State#state{connection_states = ConnectionStates,
send_queue = queue:in_r({From, RestData}, Queue),
renegotiation = {true, internal}})
end;
{empty, Queue0} ->
next_state_is_connection(State)
end.
next_state_is_connection(State =
#state{recv_during_renegotiation = true, socket_options =
#socket_options{active = false}}) ->
passive_receive(State#state{recv_during_renegotiation = false}, connection);
next_state_is_connection(State) ->
{next_state, connection, next_record_if_active(State)}.
register_session(_, _, _, #session{is_resumable = true} = Session) ->
Session; %% Already registered
register_session(client, Host, Port, Session0) ->
Session = Session0#session{is_resumable = true},
ssl_manager:register_session(Host, Port, Session),
Session;
register_session(server, _, Port, Session0) ->
Session = Session0#session{is_resumable = true},
ssl_manager:register_session(Port, Session),
Session.
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}) ->
ConnectionStates = ssl_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 = false},
transport_cb = CbModule,
data_tag = DataTag,
close_tag = CloseTag,
role = Role,
host = Host,
port = Port,
socket = Socket,
connection_states = ConnectionStates,
tls_handshake_buffer = <<>>,
tls_record_buffer = <<>>,
tls_cipher_texts = [],
user_application = {Monitor, User},
bytes_to_read = 0,
user_data_buffer = <<>>,
log_alert = true,
session_cache_cb = SessionCacheCb,
renegotiation = {false, first},
recv_during_renegotiation = false,
send_queue = queue:new()
}.
sslsocket(Pid) ->
#sslsocket{pid = Pid, fd = new_ssl}.
sslsocket() ->
sslsocket(self()).
get_socket_opts(_,[], _, Acc) ->
{ok, Acc};
get_socket_opts(Socket, [mode | Tags], SockOpts, Acc) ->
get_socket_opts(Socket, Tags, SockOpts,
[{mode, SockOpts#socket_options.mode} | Acc]);
get_socket_opts(Socket, [packet | Tags], SockOpts, Acc) ->
case SockOpts#socket_options.packet of
{Type, headers} ->
get_socket_opts(Socket, Tags, SockOpts, [{packet, Type} | Acc]);
Type ->
get_socket_opts(Socket, Tags, SockOpts, [{packet, Type} | Acc])
end;
get_socket_opts(Socket, [header | Tags], SockOpts, Acc) ->
get_socket_opts(Socket, Tags, SockOpts,
[{header, SockOpts#socket_options.header} | Acc]);
get_socket_opts(Socket, [active | Tags], SockOpts, Acc) ->
get_socket_opts(Socket, Tags, SockOpts,
[{active, SockOpts#socket_options.active} | Acc]);
get_socket_opts(Socket, [Tag | Tags], SockOpts, Acc) ->
case inet:getopts(Socket, [Tag]) of
{ok, [Opt]} ->
get_socket_opts(Socket, Tags, SockOpts, [Opt | Acc]);
{error, Error} ->
{error, Error}
end.
set_socket_opts(_, [], SockOpts, []) ->
SockOpts;
set_socket_opts(Socket, [], SockOpts, Other) ->
%% Set non emulated options
inet:setopts(Socket, Other),
SockOpts;
set_socket_opts(Socket, [{mode, Mode}| Opts], SockOpts, Other) ->
set_socket_opts(Socket, Opts,
SockOpts#socket_options{mode = Mode}, Other);
set_socket_opts(Socket, [{packet, Packet}| Opts], SockOpts, Other) ->
set_socket_opts(Socket, Opts,
SockOpts#socket_options{packet = Packet}, Other);
set_socket_opts(Socket, [{header, Header}| Opts], SockOpts, Other) ->
set_socket_opts(Socket, Opts,
SockOpts#socket_options{header = Header}, Other);
set_socket_opts(Socket, [{active, Active}| Opts], SockOpts, Other) ->
set_socket_opts(Socket, Opts,
SockOpts#socket_options{active = Active}, Other);
set_socket_opts(Socket, [Opt | Opts], SockOpts, Other) ->
set_socket_opts(Socket, Opts, SockOpts, [Opt | Other]).
alert_user(From, Alert, Role) ->
alert_user(false, no_pid, From, Alert, Role).
alert_user(false = Active, Pid, From, Alert, Role) ->
ReasonCode = ssl_alert:reason_code(Alert, Role),
send_or_reply(Active, Pid, From, {error, ReasonCode});
alert_user(Active, Pid, From, Alert, Role) ->
case ssl_alert:reason_code(Alert, Role) of
closed ->
send_or_reply(Active, Pid, From,
{ssl_closed, sslsocket()});
ReasonCode ->
send_or_reply(Active, Pid, From,
{ssl_error, sslsocket(), ReasonCode})
end.
log_alert(true, StateName, Alert) ->
Txt = ssl_alert:alert_txt(Alert),
error_logger:format("SSL: ~p: ~s\n", [StateName, Txt]);
log_alert(false, _, _) ->
ok.
handle_own_alert(Alert, Version, StateName,
#state{transport_cb = Transport,
socket = Socket,
from = User,
role = Role,
connection_states = ConnectionStates,
log_alert = Log}) ->
try %% Try to tell the other side
{BinMsg, _} =
encode_alert(Alert, Version, ConnectionStates),
Transport:send(Socket, BinMsg)
catch _:_ -> %% Can crash if we are in a uninitialized state
ignore
end,
try %% Try to tell the local user
log_alert(Log, StateName, Alert),
alert_user(User, Alert, Role)
catch _:_ ->
ok
end.
make_premaster_secret({MajVer, MinVer}, Alg) when Alg == rsa;
Alg == dh_dss;
Alg == dh_rsa ->
Rand = crypto:rand_bytes(?NUM_OF_PREMASTERSECRET_BYTES-2),
<<?BYTE(MajVer), ?BYTE(MinVer), Rand/binary>>;
make_premaster_secret(_, _) ->
undefined.
mpint_binary(Binary) ->
Size = byte_size(Binary),
<<?UINT32(Size), Binary/binary>>.
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}, from = From} = State) ->
gen_fsm:reply(From, connected),
State#state{renegotiation = undefined}.
renegotiate(#state{role = client} = State) ->
%% Handle same way as if server requested
%% the renegotiation
Hs0 = ssl_handshake:init_hashes(),
connection(#hello_request{}, State#state{tls_handshake_hashes = Hs0});
renegotiate(#state{role = server,
socket = Socket,
transport_cb = Transport,
negotiated_version = Version,
connection_states = ConnectionStates0} = State) ->
HelloRequest = ssl_handshake:hello_request(),
Frag = ssl_handshake:encode_handshake(HelloRequest, Version, undefined),
Hs0 = ssl_handshake:init_hashes(),
{BinMsg, ConnectionStates} =
ssl_record:encode_handshake(Frag, Version, ConnectionStates0),
Transport:send(Socket, BinMsg),
{next_state, hello, next_record(State#state{connection_states =
ConnectionStates,
tls_handshake_hashes = Hs0})}.
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.
