From 04397344762d506ac0286118d36e1a5b330dceb2 Mon Sep 17 00:00:00 2001 From: Ingela Anderton Andin Date: Fri, 5 Feb 2016 17:39:04 +0100 Subject: ssl: Add option signature_algs In TLS-1.2 The signature algorithm and the hash function algorithm used to produce the digest that is used when creating the digital signature may be negotiated through the signature algorithm extension RFC 5246. We want to make these algorithm pairs configurable. In connections using lower versions of TLS these algorithms are implicit defined and can not be negotiated or configured. DTLS is updated to not cause dialyzer errors, but needs to get a real implementation later. --- lib/ssl/src/ssl_connection.erl | 52 +++++++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 21 deletions(-) (limited to 'lib/ssl/src/ssl_connection.erl') diff --git a/lib/ssl/src/ssl_connection.erl b/lib/ssl/src/ssl_connection.erl index ec7d086934..f774873269 100644 --- a/lib/ssl/src/ssl_connection.erl +++ b/lib/ssl/src/ssl_connection.erl @@ -304,13 +304,9 @@ hello(#hello_request{}, #state{role = client} = State0, Connection) -> {Record, State} = Connection:next_record(State0), Connection:next_state(hello, hello, Record, State); -hello({common_client_hello, Type, ServerHelloExt, NegotiatedHashSign}, +hello({common_client_hello, Type, ServerHelloExt}, State, Connection) -> - do_server_hello(Type, ServerHelloExt, - %% Note NegotiatedHashSign is only negotiated for real if - %% if TLS version is at least TLS-1.2 - State#state{hashsign_algorithm = NegotiatedHashSign}, Connection); - + do_server_hello(Type, ServerHelloExt, State, Connection); hello(timeout, State, _) -> {next_state, hello, State, hibernate}; @@ -442,7 +438,8 @@ certify(#server_key_exchange{exchange_keys = Keys}, Alg == srp_dss; Alg == srp_rsa; Alg == srp_anon -> Params = ssl_handshake:decode_server_key(Keys, Alg, Version), - HashSign = negotiated_hashsign(Params#server_key_params.hashsign, Alg, Version), + %% Use negotiated value if TLS-1.2 otherwhise return default + HashSign = negotiated_hashsign(Params#server_key_params.hashsign, Alg, PubKeyInfo, Version), case is_anonymous(Alg) of true -> calculate_secret(Params#server_key_params.params, @@ -464,11 +461,18 @@ certify(#server_key_exchange{} = Msg, certify(#certificate_request{hashsign_algorithms = HashSigns}, #state{session = #session{own_certificate = Cert}, - negotiated_version = Version} = State0, Connection) -> - HashSign = ssl_handshake:select_hashsign(HashSigns, Cert, Version), - {Record, State} = Connection:next_record(State0#state{client_certificate_requested = true}), - Connection:next_state(certify, certify, Record, - State#state{cert_hashsign_algorithm = HashSign}); + key_algorithm = KeyExAlg, + ssl_options = #ssl_options{signature_algs = SupportedHashSigns}, + negotiated_version = Version} = State0, Connection) -> + + case ssl_handshake:select_hashsign(HashSigns, Cert, KeyExAlg, SupportedHashSigns, Version) of + #alert {} = Alert -> + Connection:handle_own_alert(Alert, Version, certify, State0); + NegotiatedHashSign -> + {Record, State} = Connection:next_record(State0#state{client_certificate_requested = true}), + Connection:next_state(certify, certify, Record, + State#state{cert_hashsign_algorithm = NegotiatedHashSign}) + end; %% PSK and RSA_PSK might bypass the Server-Key-Exchange certify(#server_hello_done{}, @@ -576,13 +580,15 @@ cipher(#hello_request{}, State0, Connection) -> cipher(#certificate_verify{signature = Signature, hashsign_algorithm = CertHashSign}, #state{role = server, - public_key_info = {Algo, _, _} =PublicKeyInfo, + key_algorithm = KexAlg, + public_key_info = PublicKeyInfo, negotiated_version = Version, session = #session{master_secret = MasterSecret}, tls_handshake_history = Handshake } = State0, Connection) -> - - HashSign = ssl_handshake:select_hashsign_algs(CertHashSign, Algo, Version), + + %% Use negotiated value if TLS-1.2 otherwhise return default + HashSign = negotiated_hashsign(CertHashSign, KexAlg, PublicKeyInfo, Version), case ssl_handshake:certificate_verify(Signature, PublicKeyInfo, Version, HashSign, MasterSecret, Handshake) of valid -> @@ -1448,7 +1454,8 @@ rsa_psk_key_exchange(Version, PskIdentity, PremasterSecret, PublicKeyInfo = {Alg rsa_psk_key_exchange(_, _, _, _) -> throw (?ALERT_REC(?FATAL,?HANDSHAKE_FAILURE)). -request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer}, +request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer, + signature_algs = SupportedHashSigns}, connection_states = ConnectionStates0, cert_db = CertDbHandle, cert_db_ref = CertDbRef, @@ -1456,7 +1463,9 @@ request_client_cert(#state{ssl_options = #ssl_options{verify = verify_peer}, #connection_state{security_parameters = #security_parameters{cipher_suite = CipherSuite}} = ssl_record:pending_connection_state(ConnectionStates0, read), - Msg = ssl_handshake:certificate_request(CipherSuite, CertDbHandle, CertDbRef, Version), + HashSigns = ssl_handshake:available_signature_algs(SupportedHashSigns, Version, [Version]), + Msg = ssl_handshake:certificate_request(CipherSuite, CertDbHandle, CertDbRef, + HashSigns, Version), State = Connection:send_handshake(Msg, State0), State#state{client_certificate_requested = true}; @@ -1881,15 +1890,16 @@ make_premaster_secret({MajVer, MinVer}, rsa) -> make_premaster_secret(_, _) -> undefined. -negotiated_hashsign(undefined, Alg, Version) -> +negotiated_hashsign(undefined, KexAlg, PubKeyInfo, Version) -> %% Not negotiated choose default - case is_anonymous(Alg) of + case is_anonymous(KexAlg) of true -> {null, anon}; false -> - ssl_handshake:select_hashsign_algs(Alg, Version) + {PubAlg, _, _} = PubKeyInfo, + ssl_handshake:select_hashsign_algs(undefined, PubAlg, Version) end; -negotiated_hashsign(HashSign = {_, _}, _, _) -> +negotiated_hashsign(HashSign = {_, _}, _, _, _) -> HashSign. ssl_options_list(SslOptions) -> -- cgit v1.2.3