diff options
Diffstat (limited to 'lib/ssl/src/dtls_handshake.erl')
| -rw-r--r-- | lib/ssl/src/dtls_handshake.erl | 115 |
1 files changed, 74 insertions, 41 deletions
diff --git a/lib/ssl/src/dtls_handshake.erl b/lib/ssl/src/dtls_handshake.erl index a22961ccca..5a799cf441 100644 --- a/lib/ssl/src/dtls_handshake.erl +++ b/lib/ssl/src/dtls_handshake.erl @@ -24,7 +24,7 @@ -include("ssl_alert.hrl"). -export([client_hello/8, client_hello/9, hello/4, - get_dtls_handshake/2, + hello_verify_request/1, get_dtls_handshake/2, dtls_handshake_new_flight/1, dtls_handshake_new_epoch/1, encode_handshake/3]). @@ -92,45 +92,25 @@ hello(#server_hello{server_version = Version, random = Random, ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION) end; -hello(#client_hello{client_version = ClientVersion}, _Options, {_,_,_,_,ConnectionStates,_}, _Renegotiation) -> - %% Return correct typ to make dialyzer happy until we have time to make the real imp. - HashSigns = tls_v1:default_signature_algs(dtls_v1:corresponding_tls_version(ClientVersion)), - {ClientVersion, {new, #session{}}, ConnectionStates, #hello_extensions{}, - %% Placeholder for real hasign handling - hd(HashSigns)}. - -%% hello(Address, Port, -%% #ssl_tls{epoch = _Epoch, sequence_number = _Seq, -%% version = Version} = Record) -> -%% case get_dtls_handshake(Record, -%% dtls_handshake_new_flight(undefined)) of -%% {[Hello | _], _} -> -%% hello(Address, Port, Version, Hello); -%% {retransmit, HandshakeState} -> -%% {retransmit, HandshakeState} -%% end. - -%% hello(Address, Port, Version, Hello) -> -%% #client_hello{client_version = {Major, Minor}, -%% random = Random, -%% session_id = SessionId, -%% cipher_suites = CipherSuites, -%% compression_methods = CompressionMethods} = Hello, -%% CookieData = [address_to_bin(Address, Port), -%% <<?BYTE(Major), ?BYTE(Minor)>>, -%% Random, SessionId, CipherSuites, CompressionMethods], -%% Cookie = crypto:hmac(sha, <<"secret">>, CookieData), - -%% case Hello of -%% #client_hello{cookie = Cookie} -> -%% accept; -%% _ -> -%% %% generate HelloVerifyRequest -%% HelloVerifyRequest = enc_hs(#hello_verify_request{protocol_version = Version, -%% cookie = Cookie}, -%% Version, 0, 1400), -%% {reply, HelloVerifyRequest} -%% end. +hello(#client_hello{client_version = ClientVersion} = Hello, + #ssl_options{versions = Versions} = SslOpts, + Info, Renegotiation) -> + Version = ssl_handshake:select_version(dtls_record, ClientVersion, Versions), + %% + %% TODO: handle Cipher Fallback + %% + handle_client_hello(Version, Hello, SslOpts, Info, Renegotiation). + +-spec hello_verify_request(binary()) -> #hello_verify_request{}. +%% +%% Description: Creates a hello verify request message sent by server to +%% verify client +%%-------------------------------------------------------------------- +hello_verify_request(Cookie) -> + %% TODO: DTLS Versions????? + #hello_verify_request{protocol_version = {254, 255}, cookie = Cookie}. + +%%-------------------------------------------------------------------- %% %%-------------------------------------------------------------------- encode_handshake(Handshake, Version, MsgSeq) -> @@ -186,10 +166,61 @@ dtls_handshake_new_flight(ExpectedReadReq) -> %%-------------------------------------------------------------------- %%% Internal functions %%-------------------------------------------------------------------- +handle_client_hello(Version, #client_hello{session_id = SugesstedId, + cipher_suites = CipherSuites, + compression_methods = Compressions, + random = Random, + extensions = #hello_extensions{elliptic_curves = Curves, + signature_algs = ClientHashSigns} = HelloExt}, + #ssl_options{versions = Versions, + signature_algs = SupportedHashSigns} = SslOpts, + {Port, Session0, Cache, CacheCb, ConnectionStates0, Cert, _}, Renegotiation) -> + case dtls_record:is_acceptable_version(Version, Versions) of + true -> + AvailableHashSigns = ssl_handshake:available_signature_algs( + ClientHashSigns, SupportedHashSigns, Cert, + dtls_v1:corresponding_tls_version(Version)), + ECCCurve = ssl_handshake:select_curve(Curves, ssl_handshake:supported_ecc(Version)), + {Type, #session{cipher_suite = CipherSuite} = Session1} + = ssl_handshake:select_session(SugesstedId, CipherSuites, AvailableHashSigns, Compressions, + Port, Session0#session{ecc = ECCCurve}, Version, + SslOpts, Cache, CacheCb, Cert), + case CipherSuite of + no_suite -> + ?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY); + _ -> + {KeyExAlg,_,_,_} = ssl_cipher:suite_definition(CipherSuite), + case ssl_handshake:select_hashsign(ClientHashSigns, Cert, KeyExAlg, SupportedHashSigns, Version) of + #alert{} = Alert -> + Alert; + HashSign -> + handle_client_hello_extensions(Version, Type, Random, CipherSuites, HelloExt, + SslOpts, Session1, ConnectionStates0, + Renegotiation, HashSign) + end + end; + false -> + ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION) + end. + +handle_client_hello_extensions(Version, Type, Random, CipherSuites, + HelloExt, SslOpts, Session0, ConnectionStates0, Renegotiation, HashSign) -> + try ssl_handshake:handle_client_hello_extensions(dtls_record, Random, CipherSuites, + HelloExt, dtls_v1:corresponding_tls_version(Version), + SslOpts, Session0, ConnectionStates0, Renegotiation) of + #alert{} = Alert -> + Alert; + {Session, ConnectionStates, Protocol, ServerHelloExt} -> + {Version, {Type, Session}, ConnectionStates, Protocol, ServerHelloExt, HashSign} + catch throw:Alert -> + Alert + end. + handle_server_hello_extensions(Version, SessionId, Random, CipherSuite, Compression, HelloExt, SslOpt, ConnectionStates0, Renegotiation) -> case ssl_handshake:handle_server_hello_extensions(dtls_record, Random, CipherSuite, - Compression, HelloExt, Version, + Compression, HelloExt, + dtls_v1:corresponding_tls_version(Version), SslOpt, ConnectionStates0, Renegotiation) of #alert{} = Alert -> Alert; @@ -406,6 +437,8 @@ enc_handshake(#hello_verify_request{protocol_version = {Major, Minor}, ?BYTE(CookieLength), Cookie/binary>>}; +enc_handshake(#hello_request{}, _Version) -> + {?HELLO_REQUEST, <<>>}; enc_handshake(#client_hello{client_version = {Major, Minor}, random = Random, session_id = SessionID, |