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authorAndreas Schultz <[email protected]>2016-01-07 15:09:21 +0100
committerIngela Anderton Andin <[email protected]>2016-06-13 22:24:14 +0200
commit0b2593dd0e9558998ba0c2de3ec1bf9adcc2e20b (patch)
treeb6f8855dd4f33b2571325deac279d8794b7d9025
parent5093b28115a674bfa26b06239f2c28981cbf73c2 (diff)
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dtls: handle Hello and HelloVerify's in dtls_handshake
-rw-r--r--lib/ssl/src/dtls_handshake.erl115
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,