%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2014. 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 : Main API module for SSL see also tls.erl and dtls.erl
-module(ssl).
-include("ssl_internal.hrl").
-include_lib("public_key/include/public_key.hrl").
%% Application handling
-export([start/0, start/1, stop/0, clear_pem_cache/0]).
%% Socket handling
-export([connect/3, connect/2, connect/4,
listen/2, transport_accept/1, transport_accept/2,
ssl_accept/1, ssl_accept/2, ssl_accept/3,
controlling_process/2, peername/1, peercert/1, sockname/1,
close/1, shutdown/2, recv/2, recv/3, send/2, getopts/2, setopts/2
]).
%% SSL/TLS protocol handling
-export([cipher_suites/0, cipher_suites/1, suite_definition/1,
connection_info/1, versions/0, session_info/1, format_error/1,
renegotiate/1, prf/5, negotiated_next_protocol/1]).
%% Misc
-export([random_bytes/1]).
-include("ssl_api.hrl").
-include("ssl_internal.hrl").
-include("ssl_record.hrl").
-include("ssl_cipher.hrl").
-include("ssl_handshake.hrl").
-include("ssl_srp.hrl").
-include_lib("public_key/include/public_key.hrl").
%%--------------------------------------------------------------------
-spec start() -> ok | {error, reason()}.
-spec start(permanent | transient | temporary) -> ok | {error, reason()}.
%%
%% Description: Utility function that starts the ssl,
%% crypto and public_key applications. Default type
%% is temporary. see application(3)
%%--------------------------------------------------------------------
start() ->
application:start(crypto),
application:start(asn1),
application:start(public_key),
application:start(ssl).
start(Type) ->
application:start(crypto, Type),
application:start(asn1),
application:start(public_key, Type),
application:start(ssl, Type).
%%--------------------------------------------------------------------
-spec stop() -> ok.
%%
%% Description: Stops the ssl application.
%%--------------------------------------------------------------------
stop() ->
application:stop(ssl).
%%--------------------------------------------------------------------
-spec connect(host() | port(), [connect_option()]) -> {ok, #sslsocket{}} |
{error, reason()}.
-spec connect(host() | port(), [connect_option()] | inet:port_number(),
timeout() | list()) ->
{ok, #sslsocket{}} | {error, reason()}.
-spec connect(host() | port(), inet:port_number(), list(), timeout()) ->
{ok, #sslsocket{}} | {error, reason()}.
%%
%% Description: Connect to an ssl server.
%%--------------------------------------------------------------------
connect(Socket, SslOptions) when is_port(Socket) ->
connect(Socket, SslOptions, infinity).
connect(Socket, SslOptions0, Timeout) when is_port(Socket) ->
{Transport,_,_,_} = proplists:get_value(cb_info, SslOptions0,
{gen_tcp, tcp, tcp_closed, tcp_error}),
EmulatedOptions = ssl_socket:emulated_options(),
{ok, SocketValues} = ssl_socket:getopts(Transport, Socket, EmulatedOptions),
try handle_options(SslOptions0 ++ SocketValues) of
{ok, #config{transport_info = CbInfo, ssl = SslOptions, emulated = EmOpts,
connection_cb = ConnectionCb}} ->
ok = ssl_socket:setopts(Transport, Socket, ssl_socket:internal_inet_values()),
case ssl_socket:peername(Transport, Socket) of
{ok, {Address, Port}} ->
ssl_connection:connect(ConnectionCb, Address, Port, Socket,
{SslOptions, emulated_socket_options(EmOpts, #socket_options{}), undefined},
self(), CbInfo, Timeout);
{error, Error} ->
{error, Error}
end
catch
_:{error, Reason} ->
{error, Reason}
end;
connect(Host, Port, Options) ->
connect(Host, Port, Options, infinity).
connect(Host, Port, Options, Timeout) ->
try handle_options(Options) of
{ok, Config} ->
do_connect(Host,Port,Config,Timeout)
catch
throw:Error ->
Error
end.
%%--------------------------------------------------------------------
-spec listen(inet:port_number(), [listen_option()]) ->{ok, #sslsocket{}} | {error, reason()}.
%%
%% Description: Creates an ssl listen socket.
%%--------------------------------------------------------------------
listen(_Port, []) ->
{error, nooptions};
listen(Port, Options0) ->
try
{ok, Config} = handle_options(Options0),
ConnectionCb = connection_cb(Options0),
#config{transport_info = {Transport, _, _, _}, inet_user = Options, connection_cb = ConnectionCb,
ssl = SslOpts, emulated = EmOpts} = Config,
case Transport:listen(Port, Options) of
{ok, ListenSocket} ->
ok = ssl_socket:setopts(Transport, ListenSocket, ssl_socket:internal_inet_values()),
{ok, Tracker} = ssl_socket:inherit_tracker(ListenSocket, EmOpts, SslOpts),
{ok, #sslsocket{pid = {ListenSocket, Config#config{emulated = Tracker}}}};
Err = {error, _} ->
Err
end
catch
Error = {error, _} ->
Error
end.
%%--------------------------------------------------------------------
-spec transport_accept(#sslsocket{}) -> {ok, #sslsocket{}} |
{error, reason()}.
-spec transport_accept(#sslsocket{}, timeout()) -> {ok, #sslsocket{}} |
{error, reason()}.
%%
%% Description: Performs transport accept on an ssl listen socket
%%--------------------------------------------------------------------
transport_accept(ListenSocket) ->
transport_accept(ListenSocket, infinity).
transport_accept(#sslsocket{pid = {ListenSocket,
#config{transport_info = {Transport,_,_, _} =CbInfo,
connection_cb = ConnectionCb,
ssl = SslOpts,
emulated = Tracker}}}, Timeout) ->
case Transport:accept(ListenSocket, Timeout) of
{ok, Socket} ->
{ok, EmOpts} = ssl_socket:get_emulated_opts(Tracker),
{ok, Port} = ssl_socket:port(Transport, Socket),
ConnArgs = [server, "localhost", Port, Socket,
{SslOpts, emulated_socket_options(EmOpts, #socket_options{}), Tracker}, self(), CbInfo],
ConnectionSup = connection_sup(ConnectionCb),
case ConnectionSup:start_child(ConnArgs) of
{ok, Pid} ->
ssl_connection:socket_control(ConnectionCb, Socket, Pid, Transport, Tracker);
{error, Reason} ->
{error, Reason}
end;
{error, Reason} ->
{error, Reason}
end.
%%--------------------------------------------------------------------
-spec ssl_accept(#sslsocket{}) -> ok | {error, reason()}.
-spec ssl_accept(#sslsocket{} | port(), timeout()| [ssl_option()
| transport_option()]) ->
ok | {ok, #sslsocket{}} | {error, reason()}.
-spec ssl_accept(#sslsocket{} | port(), [ssl_option()] | [ssl_option()| transport_option()], timeout()) ->
{ok, #sslsocket{}} | {error, reason()}.
%%
%% Description: Performs accept on an ssl listen socket. e.i. performs
%% ssl handshake.
%%--------------------------------------------------------------------
ssl_accept(ListenSocket) ->
ssl_accept(ListenSocket, infinity).
ssl_accept(#sslsocket{} = Socket, Timeout) ->
ssl_connection:handshake(Socket, Timeout);
ssl_accept(ListenSocket, SslOptions) when is_port(ListenSocket) ->
ssl_accept(ListenSocket, SslOptions, infinity).
ssl_accept(#sslsocket{} = Socket, [], Timeout) ->
ssl_accept(#sslsocket{} = Socket, Timeout);
ssl_accept(#sslsocket{fd = {_, _, _, Tracker}} = Socket, SslOpts0, Timeout) ->
try
{ok, EmOpts, InheritedSslOpts} = ssl_socket:get_all_opts(Tracker),
SslOpts = handle_options(SslOpts0, InheritedSslOpts),
ssl_connection:handshake(Socket, {SslOpts, emulated_socket_options(EmOpts, #socket_options{})}, Timeout)
catch
Error = {error, _Reason} -> Error
end;
ssl_accept(Socket, SslOptions, Timeout) when is_port(Socket) ->
{Transport,_,_,_} =
proplists:get_value(cb_info, SslOptions, {gen_tcp, tcp, tcp_closed, tcp_error}),
EmulatedOptions = ssl_socket:emulated_options(),
{ok, SocketValues} = ssl_socket:getopts(Transport, Socket, EmulatedOptions),
ConnetionCb = connection_cb(SslOptions),
try handle_options(SslOptions ++ SocketValues) of
{ok, #config{transport_info = CbInfo, ssl = SslOpts, emulated = EmOpts}} ->
ok = ssl_socket:setopts(Transport, Socket, ssl_socket:internal_inet_values()),
{ok, Port} = ssl_socket:port(Transport, Socket),
ssl_connection:ssl_accept(ConnetionCb, Port, Socket,
{SslOpts, emulated_socket_options(EmOpts, #socket_options{}), undefined},
self(), CbInfo, Timeout)
catch
Error = {error, _Reason} -> Error
end.
%%--------------------------------------------------------------------
-spec close(#sslsocket{}) -> term().
%%
%% Description: Close an ssl connection
%%--------------------------------------------------------------------
close(#sslsocket{pid = Pid}) when is_pid(Pid) ->
ssl_connection:close(Pid);
close(#sslsocket{pid = {ListenSocket, #config{transport_info={Transport,_, _, _}}}}) ->
Transport:close(ListenSocket).
%%--------------------------------------------------------------------
-spec send(#sslsocket{}, iodata()) -> ok | {error, reason()}.
%%
%% Description: Sends data over the ssl connection
%%--------------------------------------------------------------------
send(#sslsocket{pid = Pid}, Data) when is_pid(Pid) ->
ssl_connection:send(Pid, Data);
send(#sslsocket{pid = {ListenSocket, #config{transport_info={Transport, _, _, _}}}}, Data) ->
Transport:send(ListenSocket, Data). %% {error,enotconn}
%%--------------------------------------------------------------------
-spec recv(#sslsocket{}, integer()) -> {ok, binary()| list()} | {error, reason()}.
-spec recv(#sslsocket{}, integer(), timeout()) -> {ok, binary()| list()} | {error, reason()}.
%%
%% Description: Receives data when active = false
%%--------------------------------------------------------------------
recv(Socket, Length) ->
recv(Socket, Length, infinity).
recv(#sslsocket{pid = Pid}, Length, Timeout) when is_pid(Pid) ->
ssl_connection:recv(Pid, Length, Timeout);
recv(#sslsocket{pid = {Listen,
#config{transport_info = {Transport, _, _, _}}}}, _,_) when is_port(Listen)->
Transport:recv(Listen, 0). %% {error,enotconn}
%%--------------------------------------------------------------------
-spec controlling_process(#sslsocket{}, pid()) -> ok | {error, reason()}.
%%
%% Description: Changes process that receives the messages when active = true
%% or once.
%%--------------------------------------------------------------------
controlling_process(#sslsocket{pid = Pid}, NewOwner) when is_pid(Pid), is_pid(NewOwner) ->
ssl_connection:new_user(Pid, NewOwner);
controlling_process(#sslsocket{pid = {Listen,
#config{transport_info = {Transport, _, _, _}}}},
NewOwner) when is_port(Listen),
is_pid(NewOwner) ->
Transport:controlling_process(Listen, NewOwner).
%%--------------------------------------------------------------------
-spec connection_info(#sslsocket{}) -> {ok, {tls_record:tls_atom_version(), ssl_cipher:erl_cipher_suite()}} |
{error, reason()}.
%%
%% Description: Returns ssl protocol and cipher used for the connection
%%--------------------------------------------------------------------
connection_info(#sslsocket{pid = Pid}) when is_pid(Pid) ->
ssl_connection:info(Pid);
connection_info(#sslsocket{pid = {Listen, _}}) when is_port(Listen) ->
{error, enotconn}.
%%--------------------------------------------------------------------
-spec peername(#sslsocket{}) -> {ok, {inet:ip_address(), inet:port_number()}} | {error, reason()}.
%%
%% Description: same as inet:peername/1.
%%--------------------------------------------------------------------
peername(#sslsocket{pid = Pid, fd = {Transport, Socket, _, _}}) when is_pid(Pid)->
ssl_socket:peername(Transport, Socket);
peername(#sslsocket{pid = {ListenSocket, #config{transport_info = {Transport,_,_,_}}}}) ->
ssl_socket:peername(Transport, ListenSocket). %% Will return {error, enotconn}
%%--------------------------------------------------------------------
-spec peercert(#sslsocket{}) ->{ok, DerCert::binary()} | {error, reason()}.
%%
%% Description: Returns the peercert.
%%--------------------------------------------------------------------
peercert(#sslsocket{pid = Pid}) when is_pid(Pid) ->
case ssl_connection:peer_certificate(Pid) of
{ok, undefined} ->
{error, no_peercert};
Result ->
Result
end;
peercert(#sslsocket{pid = {Listen, _}}) when is_port(Listen) ->
{error, enotconn}.
%%--------------------------------------------------------------------
-spec suite_definition(ssl_cipher:cipher_suite()) -> ssl_cipher:erl_cipher_suite().
%%
%% Description: Return erlang cipher suite definition.
%%--------------------------------------------------------------------
suite_definition(S) ->
{KeyExchange, Cipher, Hash, _} = ssl_cipher:suite_definition(S),
{KeyExchange, Cipher, Hash}.
%%--------------------------------------------------------------------
-spec negotiated_next_protocol(#sslsocket{}) -> {ok, binary()} | {error, reason()}.
%%
%% Description: Returns the next protocol that has been negotiated. If no
%% protocol has been negotiated will return {error, next_protocol_not_negotiated}
%%--------------------------------------------------------------------
negotiated_next_protocol(#sslsocket{pid = Pid}) ->
ssl_connection:negotiated_next_protocol(Pid).
%%--------------------------------------------------------------------
-spec cipher_suites(erlang | openssl | all) -> [ssl_cipher:erl_cipher_suite()] |
[string()].
%% Description: Returns all supported cipher suites.
%%--------------------------------------------------------------------
cipher_suites(erlang) ->
Version = tls_record:highest_protocol_version([]),
ssl_cipher:filter_suites([suite_definition(S)
|| S <- ssl_cipher:suites(Version)]);
cipher_suites(openssl) ->
Version = tls_record:highest_protocol_version([]),
[ssl_cipher:openssl_suite_name(S)
|| S <- ssl_cipher:filter_suites(ssl_cipher:suites(Version))];
cipher_suites(all) ->
Version = tls_record:highest_protocol_version([]),
Supported = ssl_cipher:all_suites(Version)
++ ssl_cipher:anonymous_suites(Version)
++ ssl_cipher:psk_suites(Version)
++ ssl_cipher:srp_suites(),
ssl_cipher:filter_suites([suite_definition(S) || S <- Supported]).
cipher_suites() ->
cipher_suites(erlang).
%%--------------------------------------------------------------------
-spec getopts(#sslsocket{}, [gen_tcp:option_name()]) ->
{ok, [gen_tcp:option()]} | {error, reason()}.
%%
%% Description: Gets options
%%--------------------------------------------------------------------
getopts(#sslsocket{pid = Pid}, OptionTags) when is_pid(Pid), is_list(OptionTags) ->
ssl_connection:get_opts(Pid, OptionTags);
getopts(#sslsocket{pid = {_, #config{transport_info = {Transport,_,_,_}}}} = ListenSocket,
OptionTags) when is_list(OptionTags) ->
try ssl_socket:getopts(Transport, ListenSocket, OptionTags) of
{ok, _} = Result ->
Result;
{error, InetError} ->
{error, {options, {socket_options, OptionTags, InetError}}}
catch
_:Error ->
{error, {options, {socket_options, OptionTags, Error}}}
end;
getopts(#sslsocket{}, OptionTags) ->
{error, {options, {socket_options, OptionTags}}}.
%%--------------------------------------------------------------------
-spec setopts(#sslsocket{}, [gen_tcp:option()]) -> ok | {error, reason()}.
%%
%% Description: Sets options
%%--------------------------------------------------------------------
setopts(#sslsocket{pid = Pid}, Options0) when is_pid(Pid), is_list(Options0) ->
try proplists:expand([{binary, [{mode, binary}]},
{list, [{mode, list}]}], Options0) of
Options ->
ssl_connection:set_opts(Pid, Options)
catch
_:_ ->
{error, {options, {not_a_proplist, Options0}}}
end;
setopts(#sslsocket{pid = {_, #config{transport_info = {Transport,_,_,_}}}} = ListenSocket, Options) when is_list(Options) ->
try ssl_socket:setopts(Transport, ListenSocket, Options) of
ok ->
ok;
{error, InetError} ->
{error, {options, {socket_options, Options, InetError}}}
catch
_:Error ->
{error, {options, {socket_options, Options, Error}}}
end;
setopts(#sslsocket{}, Options) ->
{error, {options,{not_a_proplist, Options}}}.
%%---------------------------------------------------------------
-spec shutdown(#sslsocket{}, read | write | read_write) -> ok | {error, reason()}.
%%
%% Description: Same as gen_tcp:shutdown/2
%%--------------------------------------------------------------------
shutdown(#sslsocket{pid = {Listen, #config{transport_info = {Transport,_, _, _}}}},
How) when is_port(Listen) ->
Transport:shutdown(Listen, How);
shutdown(#sslsocket{pid = Pid}, How) ->
ssl_connection:shutdown(Pid, How).
%%--------------------------------------------------------------------
-spec sockname(#sslsocket{}) -> {ok, {inet:ip_address(), inet:port_number()}} | {error, reason()}.
%%
%% Description: Same as inet:sockname/1
%%--------------------------------------------------------------------
sockname(#sslsocket{pid = {Listen, #config{transport_info = {Transport, _, _, _}}}}) when is_port(Listen) ->
ssl_socket:sockname(Transport, Listen);
sockname(#sslsocket{pid = Pid, fd = {Transport, Socket, _, _}}) when is_pid(Pid) ->
ssl_socket:sockname(Transport, Socket).
%%---------------------------------------------------------------
-spec session_info(#sslsocket{}) -> {ok, list()} | {error, reason()}.
%%
%% Description: Returns list of session info currently [{session_id, session_id(),
%% {cipher_suite, cipher_suite()}]
%%--------------------------------------------------------------------
session_info(#sslsocket{pid = Pid}) when is_pid(Pid) ->
ssl_connection:session_info(Pid);
session_info(#sslsocket{pid = {Listen,_}}) when is_port(Listen) ->
{error, enotconn}.
%%---------------------------------------------------------------
-spec versions() -> [{ssl_app, string()} | {supported, [tls_record:tls_atom_version()]} |
{available, [tls_record:tls_atom_version()]}].
%%
%% Description: Returns a list of relevant versions.
%%--------------------------------------------------------------------
versions() ->
Vsns = tls_record:supported_protocol_versions(),
SupportedVsns = [tls_record:protocol_version(Vsn) || Vsn <- Vsns],
AvailableVsns = ?ALL_SUPPORTED_VERSIONS,
%% TODO Add DTLS versions when supported
[{ssl_app, ?VSN}, {supported, SupportedVsns}, {available, AvailableVsns}].
%%---------------------------------------------------------------
-spec renegotiate(#sslsocket{}) -> ok | {error, reason()}.
%%
%% Description: Initiates a renegotiation.
%%--------------------------------------------------------------------
renegotiate(#sslsocket{pid = Pid}) when is_pid(Pid) ->
ssl_connection:renegotiation(Pid);
renegotiate(#sslsocket{pid = {Listen,_}}) when is_port(Listen) ->
{error, enotconn}.
%%--------------------------------------------------------------------
-spec prf(#sslsocket{}, binary() | 'master_secret', binary(),
binary() | prf_random(), non_neg_integer()) ->
{ok, binary()} | {error, reason()}.
%%
%% Description: use a ssl sessions TLS PRF to generate key material
%%--------------------------------------------------------------------
prf(#sslsocket{pid = Pid},
Secret, Label, Seed, WantedLength) when is_pid(Pid) ->
ssl_connection:prf(Pid, Secret, Label, Seed, WantedLength);
prf(#sslsocket{pid = {Listen,_}}, _,_,_,_) when is_port(Listen) ->
{error, enotconn}.
%%--------------------------------------------------------------------
-spec clear_pem_cache() -> ok.
%%
%% Description: Clear the PEM cache
%%--------------------------------------------------------------------
clear_pem_cache() ->
ssl_manager:clear_pem_cache().
%%---------------------------------------------------------------
-spec format_error({error, term()}) -> list().
%%
%% Description: Creates error string.
%%--------------------------------------------------------------------
format_error({error, Reason}) ->
format_error(Reason);
format_error(Reason) when is_list(Reason) ->
Reason;
format_error(closed) ->
"TLS connection is closed";
format_error({tls_alert, Description}) ->
"TLS Alert: " ++ Description;
format_error({options,{FileType, File, Reason}}) when FileType == cacertfile;
FileType == certfile;
FileType == keyfile;
FileType == dhfile ->
Error = file_error_format(Reason),
file_desc(FileType) ++ File ++ ": " ++ Error;
format_error({options, {socket_options, Option, Error}}) ->
lists:flatten(io_lib:format("Invalid transport socket option ~p: ~s", [Option, format_error(Error)]));
format_error({options, {socket_options, Option}}) ->
lists:flatten(io_lib:format("Invalid socket option: ~p", [Option]));
format_error({options, Options}) ->
lists:flatten(io_lib:format("Invalid TLS option: ~p", [Options]));
format_error(Error) ->
case inet:format_error(Error) of
"unknown POSIX" ++ _ ->
unexpected_format(Error);
Other ->
Other
end.
%%--------------------------------------------------------------------
-spec random_bytes(integer()) -> binary().
%%
%% Description: Generates cryptographically secure random sequence if possible
%% fallbacks on pseudo random function
%%--------------------------------------------------------------------
random_bytes(N) ->
try crypto:strong_rand_bytes(N) of
RandBytes ->
RandBytes
catch
error:low_entropy ->
crypto:rand_bytes(N)
end.
%%%--------------------------------------------------------------
%%% Internal functions
%%%--------------------------------------------------------------------
do_connect(Address, Port,
#config{transport_info = CbInfo, inet_user = UserOpts, ssl = SslOpts,
emulated = EmOpts, inet_ssl = SocketOpts, connection_cb = ConnetionCb},
Timeout) ->
{Transport, _, _, _} = CbInfo,
try Transport:connect(Address, Port, SocketOpts, Timeout) of
{ok, Socket} ->
ssl_connection:connect(ConnetionCb, Address, Port, Socket,
{SslOpts, emulated_socket_options(EmOpts, #socket_options{}), undefined},
self(), CbInfo, Timeout);
{error, Reason} ->
{error, Reason}
catch
exit:{function_clause, _} ->
{error, {options, {cb_info, CbInfo}}};
exit:badarg ->
{error, {options, {socket_options, UserOpts}}};
exit:{badarg, _} ->
{error, {options, {socket_options, UserOpts}}}
end.
%% Handle extra ssl options given to ssl_accept
handle_options(Opts0, #ssl_options{protocol = Protocol, cacerts = CaCerts0,
cacertfile = CaCertFile0} = InheritedSslOpts) ->
RecordCB = record_cb(Protocol),
CaCerts = handle_option(cacerts, Opts0, CaCerts0),
{Verify, FailIfNoPeerCert, CaCertDefault, VerifyFun} = handle_verify_options(Opts0, CaCerts),
CaCertFile = case proplists:get_value(cacertfile, Opts0, CaCertFile0) of
undefined ->
CaCertDefault;
CAFile ->
CAFile
end,
NewVerifyOpts = InheritedSslOpts#ssl_options{cacerts = CaCerts,
cacertfile = CaCertFile,
verify = Verify,
verify_fun = VerifyFun,
fail_if_no_peer_cert = FailIfNoPeerCert},
SslOpts1 = lists:foldl(fun(Key, PropList) ->
proplists:delete(Key, PropList)
end, Opts0, [cacerts, cacertfile, verify, verify_fun, fail_if_no_peer_cert]),
case handle_option(versions, SslOpts1, []) of
[] ->
new_ssl_options(SslOpts1, NewVerifyOpts, RecordCB);
Value ->
Versions = [RecordCB:protocol_version(Vsn) || Vsn <- Value],
new_ssl_options(proplists:delete(versions, SslOpts1),
NewVerifyOpts#ssl_options{versions = Versions}, record_cb(Protocol))
end.
%% Handle all options in listen and connect
handle_options(Opts0) ->
Opts = proplists:expand([{binary, [{mode, binary}]},
{list, [{mode, list}]}], Opts0),
assert_proplist(Opts),
RecordCb = record_cb(Opts),
ReuseSessionFun = fun(_, _, _, _) -> true end,
CaCerts = handle_option(cacerts, Opts, undefined),
{Verify, FailIfNoPeerCert, CaCertDefault, VerifyFun} = handle_verify_options(Opts, CaCerts),
CertFile = handle_option(certfile, Opts, <<>>),
RecordCb = record_cb(Opts),
Versions = case handle_option(versions, Opts, []) of
[] ->
RecordCb:supported_protocol_versions();
Vsns ->
[RecordCb:protocol_version(Vsn) || Vsn <- Vsns]
end,
SSLOptions = #ssl_options{
versions = Versions,
verify = validate_option(verify, Verify),
verify_fun = VerifyFun,
fail_if_no_peer_cert = FailIfNoPeerCert,
verify_client_once = handle_option(verify_client_once, Opts, false),
depth = handle_option(depth, Opts, 1),
cert = handle_option(cert, Opts, undefined),
certfile = CertFile,
key = handle_option(key, Opts, undefined),
keyfile = handle_option(keyfile, Opts, CertFile),
password = handle_option(password, Opts, ""),
cacerts = CaCerts,
cacertfile = handle_option(cacertfile, Opts, CaCertDefault),
dh = handle_option(dh, Opts, undefined),
dhfile = handle_option(dhfile, Opts, undefined),
user_lookup_fun = handle_option(user_lookup_fun, Opts, undefined),
psk_identity = handle_option(psk_identity, Opts, undefined),
srp_identity = handle_option(srp_identity, Opts, undefined),
ciphers = handle_cipher_option(proplists:get_value(ciphers, Opts, []),
RecordCb:highest_protocol_version(Versions)),
%% Server side option
reuse_session = handle_option(reuse_session, Opts, ReuseSessionFun),
reuse_sessions = handle_option(reuse_sessions, Opts, true),
secure_renegotiate = handle_option(secure_renegotiate, Opts, false),
renegotiate_at = handle_option(renegotiate_at, Opts, ?DEFAULT_RENEGOTIATE_AT),
hibernate_after = handle_option(hibernate_after, Opts, undefined),
erl_dist = handle_option(erl_dist, Opts, false),
next_protocols_advertised =
handle_option(next_protocols_advertised, Opts, undefined),
next_protocol_selector =
make_next_protocol_selector(
handle_option(client_preferred_next_protocols, Opts, undefined)),
log_alert = handle_option(log_alert, Opts, true),
server_name_indication = handle_option(server_name_indication, Opts, undefined),
honor_cipher_order = handle_option(honor_cipher_order, Opts, false),
protocol = proplists:get_value(protocol, Opts, tls)
},
CbInfo = proplists:get_value(cb_info, Opts, {gen_tcp, tcp, tcp_closed, tcp_error}),
SslOptions = [protocol, versions, verify, verify_fun,
fail_if_no_peer_cert, verify_client_once,
depth, cert, certfile, key, keyfile,
password, cacerts, cacertfile, dh, dhfile,
user_lookup_fun, psk_identity, srp_identity, ciphers,
reuse_session, reuse_sessions, ssl_imp,
cb_info, renegotiate_at, secure_renegotiate, hibernate_after,
erl_dist, next_protocols_advertised,
client_preferred_next_protocols, log_alert,
server_name_indication, honor_cipher_order],
SockOpts = lists:foldl(fun(Key, PropList) ->
proplists:delete(Key, PropList)
end, Opts, SslOptions),
{Sock, Emulated} = emulated_options(SockOpts),
ConnetionCb = connection_cb(Opts),
{ok, #config{ssl = SSLOptions, emulated = Emulated, inet_ssl = Sock,
inet_user = SockOpts, transport_info = CbInfo, connection_cb = ConnetionCb
}}.
handle_option(OptionName, Opts, Default) ->
validate_option(OptionName,
proplists:get_value(OptionName, Opts, Default)).
validate_option(versions, Versions) ->
validate_versions(Versions, Versions);
validate_option(verify, Value)
when Value == verify_none; Value == verify_peer ->
Value;
validate_option(verify_fun, undefined) ->
undefined;
%% Backwards compatibility
validate_option(verify_fun, Fun) when is_function(Fun) ->
{fun(_,{bad_cert, _} = Reason, OldFun) ->
case OldFun([Reason]) of
true ->
{valid, OldFun};
false ->
{fail, Reason}
end;
(_,{extension, _}, UserState) ->
{unknown, UserState};
(_, valid, UserState) ->
{valid, UserState};
(_, valid_peer, UserState) ->
{valid, UserState}
end, Fun};
validate_option(verify_fun, {Fun, _} = Value) when is_function(Fun) ->
Value;
validate_option(fail_if_no_peer_cert, Value) when is_boolean(Value) ->
Value;
validate_option(verify_client_once, Value) when is_boolean(Value) ->
Value;
validate_option(depth, Value) when is_integer(Value),
Value >= 0, Value =< 255->
Value;
validate_option(cert, Value) when Value == undefined;
is_binary(Value) ->
Value;
validate_option(certfile, undefined = Value) ->
Value;
validate_option(certfile, Value) when is_binary(Value) ->
Value;
validate_option(certfile, Value) when is_list(Value) ->
binary_filename(Value);
validate_option(key, undefined) ->
undefined;
validate_option(key, {KeyType, Value}) when is_binary(Value),
KeyType == rsa; %% Backwards compatibility
KeyType == dsa; %% Backwards compatibility
KeyType == 'RSAPrivateKey';
KeyType == 'DSAPrivateKey';
KeyType == 'PrivateKeyInfo' ->
{KeyType, Value};
validate_option(keyfile, undefined) ->
<<>>;
validate_option(keyfile, Value) when is_binary(Value) ->
Value;
validate_option(keyfile, Value) when is_list(Value), Value =/= "" ->
binary_filename(Value);
validate_option(password, Value) when is_list(Value) ->
Value;
validate_option(cacerts, Value) when Value == undefined;
is_list(Value) ->
Value;
%% certfile must be present in some cases otherwhise it can be set
%% to the empty string.
validate_option(cacertfile, undefined) ->
<<>>;
validate_option(cacertfile, Value) when is_binary(Value) ->
Value;
validate_option(cacertfile, Value) when is_list(Value), Value =/= ""->
binary_filename(Value);
validate_option(dh, Value) when Value == undefined;
is_binary(Value) ->
Value;
validate_option(dhfile, undefined = Value) ->
Value;
validate_option(dhfile, Value) when is_binary(Value) ->
Value;
validate_option(dhfile, Value) when is_list(Value), Value =/= "" ->
binary_filename(Value);
validate_option(psk_identity, undefined) ->
undefined;
validate_option(psk_identity, Identity)
when is_list(Identity), Identity =/= "", length(Identity) =< 65535 ->
binary_filename(Identity);
validate_option(user_lookup_fun, undefined) ->
undefined;
validate_option(user_lookup_fun, {Fun, _} = Value) when is_function(Fun, 3) ->
Value;
validate_option(srp_identity, undefined) ->
undefined;
validate_option(srp_identity, {Username, Password})
when is_list(Username), is_list(Password), Username =/= "", length(Username) =< 255 ->
{unicode:characters_to_binary(Username),
unicode:characters_to_binary(Password)};
validate_option(reuse_session, Value) when is_function(Value) ->
Value;
validate_option(reuse_sessions, Value) when is_boolean(Value) ->
Value;
validate_option(secure_renegotiate, Value) when is_boolean(Value) ->
Value;
validate_option(renegotiate_at, Value) when is_integer(Value) ->
erlang:min(Value, ?DEFAULT_RENEGOTIATE_AT);
validate_option(hibernate_after, undefined) ->
undefined;
validate_option(hibernate_after, Value) when is_integer(Value), Value >= 0 ->
Value;
validate_option(erl_dist,Value) when is_boolean(Value) ->
Value;
validate_option(client_preferred_next_protocols = Opt, {Precedence, PreferredProtocols} = Value)
when is_list(PreferredProtocols) ->
case tls_record:highest_protocol_version([]) of
{3,0} ->
throw({error, {options, {not_supported_in_sslv3, {Opt, Value}}}});
_ ->
validate_binary_list(client_preferred_next_protocols, PreferredProtocols),
validate_npn_ordering(Precedence),
{Precedence, PreferredProtocols, ?NO_PROTOCOL}
end;
validate_option(client_preferred_next_protocols = Opt, {Precedence, PreferredProtocols, Default} = Value)
when is_list(PreferredProtocols), is_binary(Default),
byte_size(Default) > 0, byte_size(Default) < 256 ->
case tls_record:highest_protocol_version([]) of
{3,0} ->
throw({error, {options, {not_supported_in_sslv3, {Opt, Value}}}});
_ ->
validate_binary_list(client_preferred_next_protocols, PreferredProtocols),
validate_npn_ordering(Precedence),
Value
end;
validate_option(client_preferred_next_protocols, undefined) ->
undefined;
validate_option(log_alert, Value) when is_boolean(Value) ->
Value;
validate_option(next_protocols_advertised = Opt, Value) when is_list(Value) ->
case tls_record:highest_protocol_version([]) of
{3,0} ->
throw({error, {options, {not_supported_in_sslv3, {Opt, Value}}}});
_ ->
validate_binary_list(next_protocols_advertised, Value),
Value
end;
validate_option(next_protocols_advertised, undefined) ->
undefined;
validate_option(server_name_indication, Value) when is_list(Value) ->
Value;
validate_option(server_name_indication, disable) ->
disable;
validate_option(server_name_indication, undefined) ->
undefined;
validate_option(honor_cipher_order, Value) when is_boolean(Value) ->
Value;
validate_option(Opt, Value) ->
throw({error, {options, {Opt, Value}}}).
validate_npn_ordering(client) ->
ok;
validate_npn_ordering(server) ->
ok;
validate_npn_ordering(Value) ->
throw({error, {options, {client_preferred_next_protocols, {invalid_precedence, Value}}}}).
validate_binary_list(Opt, List) ->
lists:foreach(
fun(Bin) when is_binary(Bin),
byte_size(Bin) > 0,
byte_size(Bin) < 256 ->
ok;
(Bin) ->
throw({error, {options, {Opt, {invalid_protocol, Bin}}}})
end, List).
validate_versions([], Versions) ->
Versions;
validate_versions([Version | Rest], Versions) when Version == 'tlsv1.2';
Version == 'tlsv1.1';
Version == tlsv1;
Version == sslv3 ->
validate_versions(Rest, Versions);
validate_versions([Ver| _], Versions) ->
throw({error, {options, {Ver, {versions, Versions}}}}).
validate_inet_option(mode, Value)
when Value =/= list, Value =/= binary ->
throw({error, {options, {mode,Value}}});
validate_inet_option(packet, Value)
when not (is_atom(Value) orelse is_integer(Value)) ->
throw({error, {options, {packet,Value}}});
validate_inet_option(packet_size, Value)
when not is_integer(Value) ->
throw({error, {options, {packet_size,Value}}});
validate_inet_option(header, Value)
when not is_integer(Value) ->
throw({error, {options, {header,Value}}});
validate_inet_option(active, Value)
when Value =/= true, Value =/= false, Value =/= once ->
throw({error, {options, {active,Value}}});
validate_inet_option(_, _) ->
ok.
%% The option cacerts overrides cacertsfile
ca_cert_default(_,_, [_|_]) ->
undefined;
ca_cert_default(verify_none, _, _) ->
undefined;
ca_cert_default(verify_peer, {Fun,_}, _) when is_function(Fun) ->
undefined;
%% Server that wants to verify_peer and has no verify_fun must have
%% some trusted certs.
ca_cert_default(verify_peer, undefined, _) ->
"".
emulated_options(Opts) ->
emulated_options(Opts, ssl_socket:internal_inet_values(), ssl_socket:default_inet_values()).
emulated_options([{mode, Value} = Opt |Opts], Inet, Emulated) ->
validate_inet_option(mode, Value),
emulated_options(Opts, Inet, [Opt | proplists:delete(mode, Emulated)]);
emulated_options([{header, Value} = Opt | Opts], Inet, Emulated) ->
validate_inet_option(header, Value),
emulated_options(Opts, Inet, [Opt | proplists:delete(header, Emulated)]);
emulated_options([{active, Value} = Opt |Opts], Inet, Emulated) ->
validate_inet_option(active, Value),
emulated_options(Opts, Inet, [Opt | proplists:delete(active, Emulated)]);
emulated_options([{packet, Value} = Opt |Opts], Inet, Emulated) ->
validate_inet_option(packet, Value),
emulated_options(Opts, Inet, [Opt | proplists:delete(packet, Emulated)]);
emulated_options([{packet_size, Value} = Opt | Opts], Inet, Emulated) ->
validate_inet_option(packet_size, Value),
emulated_options(Opts, Inet, [Opt | proplists:delete(packet_size, Emulated)]);
emulated_options([Opt|Opts], Inet, Emulated) ->
emulated_options(Opts, [Opt|Inet], Emulated);
emulated_options([], Inet,Emulated) ->
{Inet, Emulated}.
handle_cipher_option(Value, Version) when is_list(Value) ->
try binary_cipher_suites(Version, Value) of
Suites ->
Suites
catch
exit:_ ->
throw({error, {options, {ciphers, Value}}});
error:_->
throw({error, {options, {ciphers, Value}}})
end.
binary_cipher_suites(Version, []) ->
%% Defaults to all supported suites that does
%% not require explicit configuration
ssl_cipher:filter_suites(ssl_cipher:suites(Version));
binary_cipher_suites(Version, [{_,_,_,_}| _] = Ciphers0) -> %% Backwards compatibility
Ciphers = [{KeyExchange, Cipher, Hash} || {KeyExchange, Cipher, Hash, _} <- Ciphers0],
binary_cipher_suites(Version, Ciphers);
binary_cipher_suites(Version, [{_,_,_}| _] = Ciphers0) ->
Ciphers = [ssl_cipher:suite(C) || C <- Ciphers0],
binary_cipher_suites(Version, Ciphers);
binary_cipher_suites(Version, [Cipher0 | _] = Ciphers0) when is_binary(Cipher0) ->
All = ssl_cipher:suites(Version)
++ ssl_cipher:anonymous_suites(Version)
++ ssl_cipher:psk_suites(Version)
++ ssl_cipher:srp_suites(),
case [Cipher || Cipher <- Ciphers0, lists:member(Cipher, All)] of
[] ->
%% Defaults to all supported suites that does
%% not require explicit configuration
ssl_cipher:filter_suites(ssl_cipher:suites(Version));
Ciphers ->
Ciphers
end;
binary_cipher_suites(Version, [Head | _] = Ciphers0) when is_list(Head) ->
%% Format: ["RC4-SHA","RC4-MD5"]
Ciphers = [ssl_cipher:openssl_suite(C) || C <- Ciphers0],
binary_cipher_suites(Version, Ciphers);
binary_cipher_suites(Version, Ciphers0) ->
%% Format: "RC4-SHA:RC4-MD5"
Ciphers = [ssl_cipher:openssl_suite(C) || C <- string:tokens(Ciphers0, ":")],
binary_cipher_suites(Version, Ciphers).
unexpected_format(Error) ->
lists:flatten(io_lib:format("Unexpected error: ~p", [Error])).
file_error_format({error, Error})->
case file:format_error(Error) of
"unknown POSIX error" ->
"decoding error";
Str ->
Str
end;
file_error_format(_) ->
"decoding error".
file_desc(cacertfile) ->
"Invalid CA certificate file ";
file_desc(certfile) ->
"Invalid certificate file ";
file_desc(keyfile) ->
"Invalid key file ";
file_desc(dhfile) ->
"Invalid DH params file ".
detect(_Pred, []) ->
undefined;
detect(Pred, [H|T]) ->
case Pred(H) of
true ->
H;
_ ->
detect(Pred, T)
end.
make_next_protocol_selector(undefined) ->
undefined;
make_next_protocol_selector({client, AllProtocols, DefaultProtocol}) ->
fun(AdvertisedProtocols) ->
case detect(fun(PreferredProtocol) ->
lists:member(PreferredProtocol, AdvertisedProtocols)
end, AllProtocols) of
undefined ->
DefaultProtocol;
PreferredProtocol ->
PreferredProtocol
end
end;
make_next_protocol_selector({server, AllProtocols, DefaultProtocol}) ->
fun(AdvertisedProtocols) ->
case detect(fun(PreferredProtocol) ->
lists:member(PreferredProtocol, AllProtocols)
end,
AdvertisedProtocols) of
undefined ->
DefaultProtocol;
PreferredProtocol ->
PreferredProtocol
end
end.
connection_cb(tls) ->
tls_connection;
connection_cb(dtls) ->
dtls_connection;
connection_cb(Opts) ->
connection_cb(proplists:get_value(protocol, Opts, tls)).
record_cb(tls) ->
tls_record;
record_cb(dtls) ->
dtls_record;
record_cb(Opts) ->
record_cb(proplists:get_value(protocol, Opts, tls)).
connection_sup(tls_connection) ->
tls_connection_sup;
connection_sup(dtls_connection) ->
dtls_connection_sup.
binary_filename(FileName) ->
Enc = file:native_name_encoding(),
unicode:characters_to_binary(FileName, unicode, Enc).
assert_proplist([]) ->
true;
assert_proplist([{Key,_} | Rest]) when is_atom(Key) ->
assert_proplist(Rest);
%% Handle exceptions
assert_proplist([inet | Rest]) ->
assert_proplist(Rest);
assert_proplist([inet6 | Rest]) ->
assert_proplist(Rest);
assert_proplist([Value | _]) ->
throw({option_not_a_key_value_tuple, Value}).
emulated_socket_options(InetValues, #socket_options{
mode = Mode,
header = Header,
active = Active,
packet = Packet,
packet_size = Size}) ->
#socket_options{
mode = proplists:get_value(mode, InetValues, Mode),
header = proplists:get_value(header, InetValues, Header),
active = proplists:get_value(active, InetValues, Active),
packet = proplists:get_value(packet, InetValues, Packet),
packet_size = proplists:get_value(packet_size, InetValues, Size)
}.
new_ssl_options([], #ssl_options{} = Opts, _) ->
Opts;
new_ssl_options([{verify_client_once, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{verify_client_once = validate_option(verify_client_once, Value)}, RecordCB);
new_ssl_options([{depth, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{depth = validate_option(depth, Value)}, RecordCB);
new_ssl_options([{cert, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{cert = validate_option(cert, Value)}, RecordCB);
new_ssl_options([{certfile, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{certfile = validate_option(certfile, Value)}, RecordCB);
new_ssl_options([{key, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{key = validate_option(key, Value)}, RecordCB);
new_ssl_options([{keyfile, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{keyfile = validate_option(keyfile, Value)}, RecordCB);
new_ssl_options([{password, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{password = validate_option(password, Value)}, RecordCB);
new_ssl_options([{dh, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{dh = validate_option(dh, Value)}, RecordCB);
new_ssl_options([{dhfile, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{dhfile = validate_option(dhfile, Value)}, RecordCB);
new_ssl_options([{user_lookup_fun, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{user_lookup_fun = validate_option(user_lookup_fun, Value)}, RecordCB);
new_ssl_options([{psk_identity, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{psk_identity = validate_option(psk_identity, Value)}, RecordCB);
new_ssl_options([{srp_identity, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{srp_identity = validate_option(srp_identity, Value)}, RecordCB);
new_ssl_options([{ciphers, Value} | Rest], #ssl_options{versions = Versions} = Opts, RecordCB) ->
Ciphers = handle_cipher_option(Value, RecordCB:highest_protocol_version(Versions)),
new_ssl_options(Rest,
Opts#ssl_options{ciphers = Ciphers}, RecordCB);
new_ssl_options([{reuse_session, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{reuse_session = validate_option(reuse_session, Value)}, RecordCB);
new_ssl_options([{reuse_sessions, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{reuse_sessions = validate_option(reuse_sessions, Value)}, RecordCB);
new_ssl_options([{ssl_imp, _Value} | Rest], #ssl_options{} = Opts, RecordCB) -> %% Not used backwards compatibility
new_ssl_options(Rest, Opts, RecordCB);
new_ssl_options([{renegotiate_at, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{ renegotiate_at = validate_option(renegotiate_at, Value)}, RecordCB);
new_ssl_options([{secure_renegotiate, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{secure_renegotiate = validate_option(secure_renegotiate, Value)}, RecordCB);
new_ssl_options([{hibernate_after, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{hibernate_after = validate_option(hibernate_after, Value)}, RecordCB);
new_ssl_options([{next_protocols_advertised, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{next_protocols_advertised = validate_option(next_protocols_advertised, Value)}, RecordCB);
new_ssl_options([{client_preferred_next_protocols, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{next_protocol_selector =
make_next_protocol_selector(validate_option(client_preferred_next_protocols, Value))}, RecordCB);
new_ssl_options([{log_alert, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{log_alert = validate_option(log_alert, Value)}, RecordCB);
new_ssl_options([{server_name_indication, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{server_name_indication = validate_option(server_name_indication, Value)}, RecordCB);
new_ssl_options([{honor_cipher_order, Value} | Rest], #ssl_options{} = Opts, RecordCB) ->
new_ssl_options(Rest, Opts#ssl_options{honor_cipher_order = validate_option(honor_cipher_order, Value)}, RecordCB);
new_ssl_options([{Key, Value} | _Rest], #ssl_options{}, _) ->
throw({error, {options, {Key, Value}}}).
handle_verify_options(Opts, CaCerts) ->
DefaultVerifyNoneFun =
{fun(_,{bad_cert, _}, UserState) ->
{valid, UserState};
(_,{extension, _}, UserState) ->
{unknown, UserState};
(_, valid, UserState) ->
{valid, UserState};
(_, valid_peer, UserState) ->
{valid, UserState}
end, []},
VerifyNoneFun = handle_option(verify_fun, Opts, DefaultVerifyNoneFun),
UserFailIfNoPeerCert = handle_option(fail_if_no_peer_cert, Opts, false),
UserVerifyFun = handle_option(verify_fun, Opts, undefined),
%% Handle 0, 1, 2 for backwards compatibility
case proplists:get_value(verify, Opts, verify_none) of
0 ->
{verify_none, false,
ca_cert_default(verify_none, VerifyNoneFun, CaCerts), VerifyNoneFun};
1 ->
{verify_peer, false,
ca_cert_default(verify_peer, UserVerifyFun, CaCerts), UserVerifyFun};
2 ->
{verify_peer, true,
ca_cert_default(verify_peer, UserVerifyFun, CaCerts), UserVerifyFun};
verify_none ->
{verify_none, false,
ca_cert_default(verify_none, VerifyNoneFun, CaCerts), VerifyNoneFun};
verify_peer ->
{verify_peer, UserFailIfNoPeerCert,
ca_cert_default(verify_peer, UserVerifyFun, CaCerts), UserVerifyFun};
Value ->
throw({error, {options, {verify, Value}}})
end.
