diff options
Diffstat (limited to 'lib/ssl/src/tls.erl')
| -rw-r--r-- | lib/ssl/src/tls.erl | 1043 |
1 files changed, 1043 insertions, 0 deletions
diff --git a/lib/ssl/src/tls.erl b/lib/ssl/src/tls.erl new file mode 100644 index 0000000000..b220a48f73 --- /dev/null +++ b/lib/ssl/src/tls.erl @@ -0,0 +1,1043 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 1999-2013. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +%% + +%%% Purpose : Main API module for SSL. + +-module(tls). + +-export([start/0, start/1, stop/0, transport_accept/1, + transport_accept/2, ssl_accept/1, ssl_accept/2, ssl_accept/3, + cipher_suites/0, cipher_suites/1, suite_definition/1, + close/1, shutdown/2, + connect/3, connect/2, connect/4, connection_info/1, + controlling_process/2, listen/2, peername/1, peercert/1, + recv/2, recv/3, send/2, getopts/2, setopts/2, sockname/1, + versions/0, session_info/1, format_error/1, + renegotiate/1, prf/5, clear_pem_cache/0, random_bytes/1, negotiated_next_protocol/1]). + +-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"). + +%% Visible in API +-export_type([connect_option/0, listen_option/0, ssl_option/0, transport_option/0, + erl_cipher_suite/0, %% From ssl_cipher.hrl + tls_atom_version/0, %% From ssl_internal.hrl + prf_random/0, sslsocket/0]). + +-record(config, {ssl, %% SSL parameters + inet_user, %% User set inet options + emulated, %% #socket_option{} emulated + inet_ssl, %% inet options for internal ssl socket + cb %% Callback info + }). + +-type sslsocket() :: #sslsocket{}. +-type connect_option() :: socket_connect_option() | ssl_option() | transport_option(). +-type socket_connect_option() :: gen_tcp:connect_option(). +-type listen_option() :: socket_listen_option() | ssl_option() | transport_option(). +-type socket_listen_option() :: gen_tcp:listen_option(). + +-type ssl_option() :: {verify, verify_type()} | + {verify_fun, {fun(), InitialUserState::term()}} | + {fail_if_no_peer_cert, boolean()} | {depth, integer()} | + {cert, Der::binary()} | {certfile, path()} | {key, Der::binary()} | + {keyfile, path()} | {password, string()} | {cacerts, [Der::binary()]} | + {cacertfile, path()} | {dh, Der::binary()} | {dhfile, path()} | + {user_lookup_fun, {fun(), InitialUserState::term()}} | + {psk_identity, string()} | + {srp_identity, {string(), string()}} | + {ciphers, ciphers()} | {ssl_imp, ssl_imp()} | {reuse_sessions, boolean()} | + {reuse_session, fun()} | {hibernate_after, integer()|undefined} | + {next_protocols_advertised, list(binary())} | + {client_preferred_next_protocols, binary(), client | server, list(binary())}. + +-type verify_type() :: verify_none | verify_peer. +-type path() :: string(). +-type ciphers() :: [erl_cipher_suite()] | + string(). % (according to old API) +-type ssl_imp() :: new | old. + +-type transport_option() :: {cb_info, {CallbackModule::atom(), DataTag::atom(), + ClosedTag::atom(), ErrTag::atom()}}. +-type prf_random() :: client_random | server_random. + +%%-------------------------------------------------------------------- +-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 = emulated_options(), + {ok, SocketValues} = ssl_socket:getopts(Transport, Socket, EmulatedOptions), + try handle_options(SslOptions0 ++ SocketValues, client) of + {ok, #config{cb = CbInfo, ssl = SslOptions, emulated = EmOpts}} -> + + ok = ssl_socket:setopts(Transport, Socket, internal_inet_values()), + case ssl_socket:peername(Transport, Socket) of + {ok, {Address, Port}} -> + tls_connection:connect(Address, Port, Socket, + {SslOptions, EmOpts}, + 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, client) 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, server), + #config{cb = {Transport, _, _, _}, inet_user = Options} = Config, + case Transport:listen(Port, Options) of + {ok, ListenSocket} -> + {ok, #sslsocket{pid = {ListenSocket, Config}}}; + 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{cb = CbInfo, ssl = SslOpts}}}, Timeout) -> + + %% The setopt could have been invoked on the listen socket + %% and options should be inherited. + EmOptions = emulated_options(), + {Transport,_,_, _} = CbInfo, + {ok, SocketValues} = ssl_socket:getopts(Transport, ListenSocket, EmOptions), + ok = ssl_socket:setopts(Transport, ListenSocket, internal_inet_values()), + case Transport:accept(ListenSocket, Timeout) of + {ok, Socket} -> + ok = ssl_socket:setopts(Transport, ListenSocket, SocketValues), + {ok, Port} = ssl_socket:port(Transport, Socket), + ConnArgs = [server, "localhost", Port, Socket, + {SslOpts, socket_options(SocketValues)}, self(), CbInfo], + case ssl_connection_sup:start_child(ConnArgs) of + {ok, Pid} -> + tls_connection:socket_control(Socket, Pid, Transport); + {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(port(), [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) -> + tls_connection:handshake(Socket, Timeout); + +ssl_accept(ListenSocket, SslOptions) when is_port(ListenSocket) -> + ssl_accept(ListenSocket, SslOptions, infinity). + +ssl_accept(Socket, SslOptions, Timeout) when is_port(Socket) -> + {Transport,_,_,_} = + proplists:get_value(cb_info, SslOptions, {gen_tcp, tcp, tcp_closed, tcp_error}), + EmulatedOptions = emulated_options(), + {ok, SocketValues} = ssl_socket:getopts(Transport, Socket, EmulatedOptions), + try handle_options(SslOptions ++ SocketValues, server) of + {ok, #config{cb = CbInfo, ssl = SslOpts, emulated = EmOpts}} -> + ok = ssl_socket:setopts(Transport, Socket, internal_inet_values()), + {ok, Port} = ssl_socket:port(Transport, Socket), + tls_connection:ssl_accept(Port, Socket, + {SslOpts, EmOpts}, + 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) -> + tls_connection:close(Pid); +close(#sslsocket{pid = {ListenSocket, #config{cb={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) -> + tls_connection:send(Pid, Data); +send(#sslsocket{pid = {ListenSocket, #config{cb={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) -> + tls_connection:recv(Pid, Length, Timeout); +recv(#sslsocket{pid = {Listen, + #config{cb={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) -> + tls_connection:new_user(Pid, NewOwner); +controlling_process(#sslsocket{pid = {Listen, + #config{cb={Transport, _, _, _}}}}, + NewOwner) when is_port(Listen), + is_pid(NewOwner) -> + Transport:controlling_process(Listen, NewOwner). + +%%-------------------------------------------------------------------- +-spec connection_info(#sslsocket{}) -> {ok, {tls_atom_version(), erl_cipher_suite()}} | + {error, reason()}. +%% +%% Description: Returns ssl protocol and cipher used for the connection +%%-------------------------------------------------------------------- +connection_info(#sslsocket{pid = Pid}) when is_pid(Pid) -> + tls_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{cb = {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 tls_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(cipher_suite()) -> 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}) -> + tls_connection:negotiated_next_protocol(Pid). + +-spec cipher_suites() -> [erl_cipher_suite()]. +-spec cipher_suites(erlang | openssl | all) -> [erl_cipher_suite()] | [string()]. + +%% Description: Returns all supported cipher suites. +%%-------------------------------------------------------------------- +cipher_suites() -> + cipher_suites(erlang). + +cipher_suites(erlang) -> + Version = tls_record:highest_protocol_version([]), + [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:suites(Version)]; +cipher_suites(all) -> + Version = tls_record:highest_protocol_version([]), + Supported = ssl_cipher:suites(Version) + ++ ssl_cipher:anonymous_suites() + ++ ssl_cipher:psk_suites(Version) + ++ ssl_cipher:srp_suites(), + [suite_definition(S) || S <- Supported]. + +%%-------------------------------------------------------------------- +-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) -> + tls_connection:get_opts(Pid, OptionTags); +getopts(#sslsocket{pid = {ListenSocket, #config{cb = {Transport,_,_,_}}}}, + 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, {options, {socket_options, OptionTags}}} + 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 -> + tls_connection:set_opts(Pid, Options) + catch + _:_ -> + {error, {options, {not_a_proplist, Options0}}} + end; + +setopts(#sslsocket{pid = {ListenSocket, #config{cb = {Transport,_,_,_}}}}, 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{cb={Transport,_, _, _}}}}, + How) when is_port(Listen) -> + Transport:shutdown(Listen, How); +shutdown(#sslsocket{pid = Pid}, How) -> + tls_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{cb={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) -> + tls_connection:session_info(Pid); +session_info(#sslsocket{pid = {Listen,_}}) when is_port(Listen) -> + {error, enotconn}. + +%%--------------------------------------------------------------- +-spec versions() -> [{ssl_app, string()} | {supported, [tls_atom_version()]} | + {available, [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, + [{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) -> + tls_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) -> + tls_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{cb=CbInfo, inet_user=UserOpts, ssl=SslOpts, + emulated=EmOpts,inet_ssl=SocketOpts}, + Timeout) -> + {Transport, _, _, _} = CbInfo, + try Transport:connect(Address, Port, SocketOpts, Timeout) of + {ok, Socket} -> + tls_connection:connect(Address, Port, Socket, {SslOpts,EmOpts}, + 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_options(Opts0, _Role) -> + Opts = proplists:expand([{binary, [{mode, binary}]}, + {list, [{mode, list}]}], Opts0), + ReuseSessionFun = fun(_, _, _, _) -> true end, + + 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), + CaCerts = handle_option(cacerts, Opts, undefined), + + {Verify, FailIfNoPeerCert, CaCertDefault, VerifyFun} = + %% 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, + + CertFile = handle_option(certfile, Opts, <<>>), + + Versions = case handle_option(versions, Opts, []) of + [] -> + tls_record:supported_protocol_versions(); + Vsns -> + [tls_record: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_option(ciphers, Opts, []), + %% 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) + }, + + CbInfo = proplists:get_value(cb_info, Opts, {gen_tcp, tcp, tcp_closed, tcp_error}), + SslOptions = [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], + + SockOpts = lists:foldl(fun(Key, PropList) -> + proplists:delete(Key, PropList) + end, Opts, SslOptions), + + {SSLsock, Emulated} = emulated_options(SockOpts), + {ok, #config{ssl=SSLOptions, emulated=Emulated, inet_ssl=SSLsock, + inet_user=SockOpts, cb=CbInfo}}. + +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 Value == true; Value == false -> + Value; +validate_option(verify_client_once, Value) + when Value == true; Value == false -> + 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) -> + list_to_binary(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 =/= "" -> + list_to_binary(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 =/= ""-> + list_to_binary(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 =/= "" -> + list_to_binary(Value); +validate_option(psk_identity, undefined) -> + undefined; +validate_option(psk_identity, Identity) + when is_list(Identity), Identity =/= "", length(Identity) =< 65535 -> + list_to_binary(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 -> + {list_to_binary(Username), list_to_binary(Password)}; + +validate_option(ciphers, Value) when is_list(Value) -> + Version = tls_record:highest_protocol_version([]), + try cipher_suites(Version, Value) + catch + exit:_ -> + throw({error, {options, {ciphers, Value}}}); + error:_-> + throw({error, {options, {ciphers, Value}}}) + end; +validate_option(reuse_session, Value) when is_function(Value) -> + Value; +validate_option(reuse_sessions, Value) when Value == true; + Value == false -> + Value; + +validate_option(secure_renegotiate, Value) when Value == true; + Value == false -> + 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 Value == true; + Value == false -> + 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 Value == true; + Value == false -> + 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(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() -> + [mode, packet, active, header, packet_size]. + +internal_inet_values() -> + [{packet_size,0},{packet, 0},{header, 0},{active, false},{mode,binary}]. + +socket_options(InetValues) -> + #socket_options{ + mode = proplists:get_value(mode, InetValues, lists), + header = proplists:get_value(header, InetValues, 0), + active = proplists:get_value(active, InetValues, active), + packet = proplists:get_value(packet, InetValues, 0), + packet_size = proplists:get_value(packet_size, InetValues) + }. + +emulated_options(Opts) -> + emulated_options(Opts, internal_inet_values(), #socket_options{}). + +emulated_options([{mode,Opt}|Opts], Inet, Emulated) -> + validate_inet_option(mode,Opt), + emulated_options(Opts, Inet, Emulated#socket_options{mode=Opt}); +emulated_options([{header,Opt}|Opts], Inet, Emulated) -> + validate_inet_option(header,Opt), + emulated_options(Opts, Inet, Emulated#socket_options{header=Opt}); +emulated_options([{active,Opt}|Opts], Inet, Emulated) -> + validate_inet_option(active,Opt), + emulated_options(Opts, Inet, Emulated#socket_options{active=Opt}); +emulated_options([{packet,Opt}|Opts], Inet, Emulated) -> + validate_inet_option(packet,Opt), + emulated_options(Opts, Inet, Emulated#socket_options{packet=Opt}); +emulated_options([{packet_size,Opt}|Opts], Inet, Emulated) -> + validate_inet_option(packet_size,Opt), + emulated_options(Opts, Inet, Emulated#socket_options{packet_size=Opt}); +emulated_options([Opt|Opts], Inet, Emulated) -> + emulated_options(Opts, [Opt|Inet], Emulated); +emulated_options([], Inet,Emulated) -> + {Inet, Emulated}. + +cipher_suites(Version, []) -> + ssl_cipher:suites(Version); +cipher_suites(Version, [{_,_,_,_}| _] = Ciphers0) -> %% Backwards compatibility + Ciphers = [{KeyExchange, Cipher, Hash} || {KeyExchange, Cipher, Hash, _} <- Ciphers0], + cipher_suites(Version, Ciphers); +cipher_suites(Version, [{_,_,_}| _] = Ciphers0) -> + Ciphers = [ssl_cipher:suite(C) || C <- Ciphers0], + cipher_suites(Version, Ciphers); + +cipher_suites(Version, [Cipher0 | _] = Ciphers0) when is_binary(Cipher0) -> + Supported0 = ssl_cipher:suites(Version) + ++ ssl_cipher:anonymous_suites() + ++ ssl_cipher:psk_suites(Version) + ++ ssl_cipher:srp_suites(), + Supported = ssl_cipher:filter_suites(Supported0), + case [Cipher || Cipher <- Ciphers0, lists:member(Cipher, Supported)] of + [] -> + Supported; + Ciphers -> + Ciphers + end; +cipher_suites(Version, [Head | _] = Ciphers0) when is_list(Head) -> + %% Format: ["RC4-SHA","RC4-MD5"] + Ciphers = [ssl_cipher:openssl_suite(C) || C <- Ciphers0], + cipher_suites(Version, Ciphers); +cipher_suites(Version, Ciphers0) -> + %% Format: "RC4-SHA:RC4-MD5" + Ciphers = [ssl_cipher:openssl_suite(C) || C <- string:tokens(Ciphers0, ":")], + 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. |