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ssl_handshake.erl
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ssl_handshake.erl
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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2013-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%----------------------------------------------------------------------
%% Purpose: Help funtions for handling the SSL-handshake protocol (common
%% to SSL/TLS and DTLS
%%----------------------------------------------------------------------
-module(ssl_handshake).
-include("ssl_handshake.hrl").
-include("ssl_record.hrl").
-include("ssl_cipher.hrl").
-include("ssl_alert.hrl").
-include("ssl_internal.hrl").
-include("ssl_srp.hrl").
-include_lib("public_key/include/public_key.hrl").
-export_type([ssl_handshake/0, ssl_handshake_history/0,
public_key_info/0, oid/0]).
-type oid() :: tuple().
-type public_key_params() :: #'Dss-Parms'{} | {namedCurve, oid()} | #'ECParameters'{} | term().
-type public_key_info() :: {oid(), #'RSAPublicKey'{} | integer() | #'ECPoint'{}, public_key_params()}.
-type ssl_handshake_history() :: {[binary()], [binary()]}.
-type ssl_handshake() :: #server_hello{} | #server_hello_done{} | #certificate{} | #certificate_request{} |
#client_key_exchange{} | #finished{} | #certificate_verify{} |
#hello_request{} | #next_protocol{}.
%% Create handshake messages
-export([hello_request/0, server_hello/4, server_hello_done/0,
certificate/4, client_certificate_verify/6, certificate_request/5, key_exchange/3,
finished/5, next_protocol/1]).
%% Handle handshake messages
-export([certify/7, certificate_verify/6, verify_signature/5,
master_secret/4, server_key_exchange_hash/2, verify_connection/6,
init_handshake_history/0, update_handshake_history/3, verify_server_key/5,
select_version/3
]).
%% Encode
-export([encode_handshake/2, encode_hello_extensions/1,
encode_client_protocol_negotiation/2, encode_protocols_advertised_on_server/1]).
%% Decode
-export([decode_handshake/3, decode_hello_extensions/1,
decode_server_key/3, decode_client_key/3,
decode_suites/2
]).
%% Cipher suites handling
-export([available_suites/2, available_signature_algs/2, available_signature_algs/4,
cipher_suites/3, prf/6, select_session/11, supported_ecc/1,
premaster_secret/2, premaster_secret/3, premaster_secret/4]).
%% Extensions handling
-export([client_hello_extensions/5,
handle_client_hello_extensions/9, %% Returns server hello extensions
handle_server_hello_extensions/9, select_curve/2, select_curve/3,
select_hashsign/4, select_hashsign/5,
select_hashsign_algs/3
]).
%%====================================================================
%% Create handshake messages
%%====================================================================
%%--------------------------------------------------------------------
-spec hello_request() -> #hello_request{}.
%%
%% Description: Creates a hello request message sent by server to
%% trigger renegotiation.
%%--------------------------------------------------------------------
hello_request() ->
#hello_request{}.
%%--------------------------------------------------------------------
-spec server_hello(#session{}, ssl_record:ssl_version(), ssl_record:connection_states(),
#hello_extensions{}) -> #server_hello{}.
%%
%% Description: Creates a server hello message.
%%--------------------------------------------------------------------
server_hello(SessionId, Version, ConnectionStates, Extensions) ->
#{security_parameters := SecParams} =
ssl_record:pending_connection_state(ConnectionStates, read),
#server_hello{server_version = Version,
cipher_suite = SecParams#security_parameters.cipher_suite,
compression_method =
SecParams#security_parameters.compression_algorithm,
random = SecParams#security_parameters.server_random,
session_id = SessionId,
extensions = Extensions
}.
%%--------------------------------------------------------------------
-spec server_hello_done() -> #server_hello_done{}.
%%
%% Description: Creates a server hello done message.
%%--------------------------------------------------------------------
server_hello_done() ->
#server_hello_done{}.
%%--------------------------------------------------------------------
-spec certificate(der_cert(), db_handle(), certdb_ref(), client | server) -> #certificate{} | #alert{}.
%%
%% Description: Creates a certificate message.
%%--------------------------------------------------------------------
certificate(OwnCert, CertDbHandle, CertDbRef, client) ->
Chain =
case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of
{ok, _, CertChain} ->
CertChain;
{error, _} ->
%% If no suitable certificate is available, the client
%% SHOULD send a certificate message containing no
%% certificates. (chapter 7.4.6. RFC 4346)
[]
end,
#certificate{asn1_certificates = Chain};
certificate(OwnCert, CertDbHandle, CertDbRef, server) ->
case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of
{ok, _, Chain} ->
#certificate{asn1_certificates = Chain};
{error, _} ->
?ALERT_REC(?FATAL, ?INTERNAL_ERROR, server_has_no_suitable_certificates)
end.
%%--------------------------------------------------------------------
-spec client_certificate_verify(undefined | der_cert(), binary(),
ssl_record:ssl_version(), term(), public_key:private_key(),
ssl_handshake_history()) ->
#certificate_verify{} | ignore | #alert{}.
%%
%% Description: Creates a certificate_verify message, called by the client.
%%--------------------------------------------------------------------
client_certificate_verify(undefined, _, _, _, _, _) ->
ignore;
client_certificate_verify(_, _, _, _, undefined, _) ->
ignore;
client_certificate_verify(OwnCert, MasterSecret, Version,
{HashAlgo, SignAlgo},
PrivateKey, {Handshake, _}) ->
case public_key:pkix_is_fixed_dh_cert(OwnCert) of
true ->
?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE, fixed_diffie_hellman_prohibited);
false ->
Hashes =
calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake),
Signed = digitally_signed(Version, Hashes, HashAlgo, PrivateKey),
#certificate_verify{signature = Signed, hashsign_algorithm = {HashAlgo, SignAlgo}}
end.
%%--------------------------------------------------------------------
-spec certificate_request(ssl_cipher:cipher_suite(), db_handle(),
certdb_ref(), #hash_sign_algos{}, ssl_record:ssl_version()) ->
#certificate_request{}.
%%
%% Description: Creates a certificate_request message, called by the server.
%%--------------------------------------------------------------------
certificate_request(CipherSuite, CertDbHandle, CertDbRef, HashSigns, Version) ->
Types = certificate_types(ssl_cipher:suite_definition(CipherSuite), Version),
Authorities = certificate_authorities(CertDbHandle, CertDbRef),
#certificate_request{
certificate_types = Types,
hashsign_algorithms = HashSigns,
certificate_authorities = Authorities
}.
%%--------------------------------------------------------------------
-spec key_exchange(client | server, ssl_record:ssl_version(),
{premaster_secret, binary(), public_key_info()} |
{dh, binary()} |
{dh, {binary(), binary()}, #'DHParameter'{}, {HashAlgo::atom(), SignAlgo::atom()},
binary(), binary(), public_key:private_key()} |
{ecdh, #'ECPrivateKey'{}} |
{psk, binary()} |
{dhe_psk, binary(), binary()} |
{srp, {binary(), binary()}, #srp_user{}, {HashAlgo::atom(), SignAlgo::atom()},
binary(), binary(), public_key:private_key()}) ->
#client_key_exchange{} | #server_key_exchange{}.
%%
%% Description: Creates a keyexchange message.
%%--------------------------------------------------------------------
key_exchange(client, _Version, {premaster_secret, Secret, {_, PublicKey, _}}) ->
EncPremasterSecret =
encrypted_premaster_secret(Secret, PublicKey),
#client_key_exchange{exchange_keys = EncPremasterSecret};
key_exchange(client, _Version, {dh, PublicKey}) ->
#client_key_exchange{
exchange_keys = #client_diffie_hellman_public{
dh_public = PublicKey}
};
key_exchange(client, _Version, {ecdh, #'ECPrivateKey'{publicKey = ECPublicKey}}) ->
#client_key_exchange{
exchange_keys = #client_ec_diffie_hellman_public{
dh_public = ECPublicKey}
};
key_exchange(client, _Version, {psk, Identity}) ->
#client_key_exchange{
exchange_keys = #client_psk_identity{
identity = Identity}
};
key_exchange(client, _Version, {dhe_psk, Identity, PublicKey}) ->
#client_key_exchange{
exchange_keys = #client_dhe_psk_identity{
identity = Identity,
dh_public = PublicKey}
};
key_exchange(client, _Version, {psk_premaster_secret, PskIdentity, Secret, {_, PublicKey, _}}) ->
EncPremasterSecret =
encrypted_premaster_secret(Secret, PublicKey),
#client_key_exchange{
exchange_keys = #client_rsa_psk_identity{
identity = PskIdentity,
exchange_keys = EncPremasterSecret}};
key_exchange(client, _Version, {srp, PublicKey}) ->
#client_key_exchange{
exchange_keys = #client_srp_public{
srp_a = PublicKey}
};
key_exchange(server, Version, {dh, {PublicKey, _},
#'DHParameter'{prime = P, base = G},
HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
ServerDHParams = #server_dh_params{dh_p = int_to_bin(P),
dh_g = int_to_bin(G), dh_y = PublicKey},
enc_server_key_exchange(Version, ServerDHParams, HashSign,
ClientRandom, ServerRandom, PrivateKey);
key_exchange(server, Version, {ecdh, #'ECPrivateKey'{publicKey = ECPublicKey,
parameters = ECCurve}, HashSign,
ClientRandom, ServerRandom, PrivateKey}) ->
ServerECParams = #server_ecdh_params{curve = ECCurve, public = ECPublicKey},
enc_server_key_exchange(Version, ServerECParams, HashSign,
ClientRandom, ServerRandom, PrivateKey);
key_exchange(server, Version, {psk, PskIdentityHint,
HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
ServerPSKParams = #server_psk_params{hint = PskIdentityHint},
enc_server_key_exchange(Version, ServerPSKParams, HashSign,
ClientRandom, ServerRandom, PrivateKey);
key_exchange(server, Version, {dhe_psk, PskIdentityHint, {PublicKey, _},
#'DHParameter'{prime = P, base = G},
HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
ServerEDHPSKParams = #server_dhe_psk_params{
hint = PskIdentityHint,
dh_params = #server_dh_params{dh_p = int_to_bin(P),
dh_g = int_to_bin(G), dh_y = PublicKey}
},
enc_server_key_exchange(Version, ServerEDHPSKParams,
HashSign, ClientRandom, ServerRandom, PrivateKey);
key_exchange(server, Version, {srp, {PublicKey, _},
#srp_user{generator = Generator, prime = Prime,
salt = Salt},
HashSign, ClientRandom, ServerRandom, PrivateKey}) ->
ServerSRPParams = #server_srp_params{srp_n = Prime, srp_g = Generator,
srp_s = Salt, srp_b = PublicKey},
enc_server_key_exchange(Version, ServerSRPParams, HashSign,
ClientRandom, ServerRandom, PrivateKey).
%%--------------------------------------------------------------------
-spec finished(ssl_record:ssl_version(), client | server, integer(), binary(), ssl_handshake_history()) ->
#finished{}.
%%
%% Description: Creates a handshake finished message
%%-------------------------------------------------------------------
finished(Version, Role, PrfAlgo, MasterSecret, {Handshake, _}) -> % use the current handshake
#finished{verify_data =
calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake)}.
%%--------------------------------------------------------------------
-spec next_protocol(binary()) -> #next_protocol{}.
%%
%% Description: Creates a next protocol message
%%-------------------------------------------------------------------
next_protocol(SelectedProtocol) ->
#next_protocol{selected_protocol = SelectedProtocol}.
%%====================================================================
%% Handle handshake messages
%%====================================================================
%%--------------------------------------------------------------------
-spec certify(#certificate{}, db_handle(), certdb_ref(), #ssl_options{}, term(),
client | server, inet:hostname() | inet:ip_address()) -> {der_cert(), public_key_info()} | #alert{}.
%%
%% Description: Handles a certificate handshake message
%%--------------------------------------------------------------------
certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef,
Opts, CRLDbHandle, Role, Host) ->
ServerName = server_name(Opts#ssl_options.server_name_indication, Host, Role),
[PeerCert | _] = ASN1Certs,
try
{TrustedCert, CertPath} =
ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef,
Opts#ssl_options.partial_chain),
ValidationFunAndState = validation_fun_and_state(Opts#ssl_options.verify_fun, Role,
CertDbHandle, CertDbRef, ServerName,
Opts#ssl_options.crl_check, CRLDbHandle, CertPath),
case public_key:pkix_path_validation(TrustedCert,
CertPath,
[{max_path_length, Opts#ssl_options.depth},
{verify_fun, ValidationFunAndState}]) of
{ok, {PublicKeyInfo,_}} ->
{PeerCert, PublicKeyInfo};
{error, Reason} ->
path_validation_alert(Reason)
end
catch
error:{badmatch,{asn1, Asn1Reason}} ->
%% ASN-1 decode of certificate somehow failed
?ALERT_REC(?FATAL, ?CERTIFICATE_UNKNOWN, {failed_to_decode_certificate, Asn1Reason});
error:OtherReason ->
?ALERT_REC(?FATAL, ?INTERNAL_ERROR, {unexpected_error, OtherReason})
end.
%%--------------------------------------------------------------------
-spec certificate_verify(binary(), public_key_info(), ssl_record:ssl_version(), term(),
binary(), ssl_handshake_history()) -> valid | #alert{}.
%%
%% Description: Checks that the certificate_verify message is valid.
%%--------------------------------------------------------------------
certificate_verify(_, _, _, undefined, _, _) ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, invalid_certificate_verify_message);
certificate_verify(Signature, PublicKeyInfo, Version,
HashSign = {HashAlgo, _}, MasterSecret, {_, Handshake}) ->
Hash = calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake),
case verify_signature(Version, Hash, HashSign, Signature, PublicKeyInfo) of
true ->
valid;
_ ->
?ALERT_REC(?FATAL, ?BAD_CERTIFICATE)
end.
%%--------------------------------------------------------------------
-spec verify_signature(ssl_record:ssl_version(), binary(), {term(), term()}, binary(),
public_key_info()) -> true | false.
%%
%% Description: Checks that a public_key signature is valid.
%%--------------------------------------------------------------------
verify_signature(_Version, _Hash, {_HashAlgo, anon}, _Signature, _) ->
true;
verify_signature({3, Minor}, Hash, {HashAlgo, rsa}, Signature, {?rsaEncryption, PubKey, _PubKeyParams})
when Minor >= 3 ->
public_key:verify({digest, Hash}, HashAlgo, Signature, PubKey);
verify_signature(_Version, Hash, _HashAlgo, Signature, {?rsaEncryption, PubKey, _PubKeyParams}) ->
case public_key:decrypt_public(Signature, PubKey,
[{rsa_pad, rsa_pkcs1_padding}]) of
Hash -> true;
_ -> false
end;
verify_signature(_Version, Hash, {HashAlgo, dsa}, Signature, {?'id-dsa', PublicKey, PublicKeyParams}) ->
public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams});
verify_signature(_, Hash, {HashAlgo, _SignAlg}, Signature,
{?'id-ecPublicKey', PublicKey, PublicKeyParams}) ->
public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams}).
%%--------------------------------------------------------------------
-spec master_secret(ssl_record:ssl_version(), #session{} | binary(), ssl_record:connection_states(),
client | server) -> {binary(), ssl_record:connection_states()} | #alert{}.
%%
%% Description: Sets or calculates the master secret and calculate keys,
%% updating the pending connection states. The Mastersecret and the update
%% connection states are returned or an alert if the calculation fails.
%%-------------------------------------------------------------------
master_secret(Version, #session{master_secret = Mastersecret},
ConnectionStates, Role) ->
#{security_parameters := SecParams} =
ssl_record:pending_connection_state(ConnectionStates, read),
try master_secret(Version, Mastersecret, SecParams,
ConnectionStates, Role)
catch
exit:_ ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, key_calculation_failure)
end;
master_secret(Version, PremasterSecret, ConnectionStates, Role) ->
#{security_parameters := SecParams} =
ssl_record:pending_connection_state(ConnectionStates, read),
#security_parameters{prf_algorithm = PrfAlgo,
client_random = ClientRandom,
server_random = ServerRandom} = SecParams,
try master_secret(Version,
calc_master_secret(Version,PrfAlgo,PremasterSecret,
ClientRandom, ServerRandom),
SecParams, ConnectionStates, Role)
catch
exit:_ ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, master_secret_calculation_failure)
end.
%%--------------------------------------------------------------------
-spec server_key_exchange_hash(md5sha | md5 | sha | sha224 |sha256 | sha384 | sha512, binary()) -> binary().
%%
%% Description: Calculate server key exchange hash
%%--------------------------------------------------------------------
server_key_exchange_hash(md5sha, Value) ->
MD5 = crypto:hash(md5, Value),
SHA = crypto:hash(sha, Value),
<<MD5/binary, SHA/binary>>;
server_key_exchange_hash(Hash, Value) ->
crypto:hash(Hash, Value).
%%--------------------------------------------------------------------
-spec verify_connection(ssl_record:ssl_version(), #finished{}, client | server, integer(), binary(),
ssl_handshake_history()) -> verified | #alert{}.
%%
%% Description: Checks the ssl handshake finished message to verify
%% the connection.
%%-------------------------------------------------------------------
verify_connection(Version, #finished{verify_data = Data},
Role, PrfAlgo, MasterSecret, {_, Handshake}) ->
%% use the previous hashes
case calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake) of
Data ->
verified;
_ ->
?ALERT_REC(?FATAL, ?DECRYPT_ERROR)
end.
%%--------------------------------------------------------------------
-spec init_handshake_history() -> ssl_handshake_history().
%%
%% Description: Initialize the empty handshake history buffer.
%%--------------------------------------------------------------------
init_handshake_history() ->
{[], []}.
%%--------------------------------------------------------------------
-spec update_handshake_history(ssl_handshake:ssl_handshake_history(), Data ::term(), boolean()) ->
ssl_handshake:ssl_handshake_history().
%%
%% Description: Update the handshake history buffer with Data.
%%--------------------------------------------------------------------
update_handshake_history(Handshake, % special-case SSL2 client hello
<<?CLIENT_HELLO, ?UINT24(_), ?BYTE(Major), ?BYTE(Minor),
?UINT16(CSLength), ?UINT16(0),
?UINT16(CDLength),
CipherSuites:CSLength/binary,
ChallengeData:CDLength/binary>>, true) ->
update_handshake_history(Handshake,
<<?CLIENT_HELLO, ?BYTE(Major), ?BYTE(Minor),
?UINT16(CSLength), ?UINT16(0),
?UINT16(CDLength),
CipherSuites:CSLength/binary,
ChallengeData:CDLength/binary>>, true);
update_handshake_history({Handshake0, _Prev}, Data, _) ->
{[Data|Handshake0], Handshake0}.
verify_server_key(#server_key_params{params_bin = EncParams,
signature = Signature},
HashSign = {HashAlgo, _},
ConnectionStates, Version, PubKeyInfo) ->
#{security_parameters := SecParams} =
ssl_record:pending_connection_state(ConnectionStates, read),
#security_parameters{client_random = ClientRandom,
server_random = ServerRandom} = SecParams,
Hash = server_key_exchange_hash(HashAlgo,
<<ClientRandom/binary,
ServerRandom/binary,
EncParams/binary>>),
verify_signature(Version, Hash, HashSign, Signature, PubKeyInfo).
select_version(RecordCB, ClientVersion, Versions) ->
do_select_version(RecordCB, ClientVersion, Versions).
%%====================================================================
%% Encode handshake
%%====================================================================
encode_handshake(#next_protocol{selected_protocol = SelectedProtocol}, _Version) ->
PaddingLength = 32 - ((byte_size(SelectedProtocol) + 2) rem 32),
{?NEXT_PROTOCOL, <<?BYTE((byte_size(SelectedProtocol))), SelectedProtocol/binary,
?BYTE(PaddingLength), 0:(PaddingLength * 8)>>};
encode_handshake(#server_hello{server_version = {Major, Minor},
random = Random,
session_id = Session_ID,
cipher_suite = CipherSuite,
compression_method = Comp_method,
extensions = #hello_extensions{} = Extensions}, _Version) ->
SID_length = byte_size(Session_ID),
ExtensionsBin = encode_hello_extensions(Extensions),
{?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
?BYTE(SID_length), Session_ID/binary,
CipherSuite/binary, ?BYTE(Comp_method), ExtensionsBin/binary>>};
encode_handshake(#certificate{asn1_certificates = ASN1CertList}, _Version) ->
ASN1Certs = certs_from_list(ASN1CertList),
ACLen = erlang:iolist_size(ASN1Certs),
{?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>};
encode_handshake(#server_key_exchange{exchange_keys = Keys}, _Version) ->
{?SERVER_KEY_EXCHANGE, Keys};
encode_handshake(#server_key_params{params_bin = Keys, hashsign = HashSign,
signature = Signature}, Version) ->
EncSign = enc_sign(HashSign, Signature, Version),
{?SERVER_KEY_EXCHANGE, <<Keys/binary, EncSign/binary>>};
encode_handshake(#certificate_request{certificate_types = CertTypes,
hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos},
certificate_authorities = CertAuths},
{Major, Minor})
when Major == 3, Minor >= 3 ->
HashSigns= << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> ||
{Hash, Sign} <- HashSignAlgos >>,
CertTypesLen = byte_size(CertTypes),
HashSignsLen = byte_size(HashSigns),
CertAuthsLen = byte_size(CertAuths),
{?CERTIFICATE_REQUEST,
<<?BYTE(CertTypesLen), CertTypes/binary,
?UINT16(HashSignsLen), HashSigns/binary,
?UINT16(CertAuthsLen), CertAuths/binary>>
};
encode_handshake(#certificate_request{certificate_types = CertTypes,
certificate_authorities = CertAuths},
_Version) ->
CertTypesLen = byte_size(CertTypes),
CertAuthsLen = byte_size(CertAuths),
{?CERTIFICATE_REQUEST,
<<?BYTE(CertTypesLen), CertTypes/binary,
?UINT16(CertAuthsLen), CertAuths/binary>>
};
encode_handshake(#server_hello_done{}, _Version) ->
{?SERVER_HELLO_DONE, <<>>};
encode_handshake(#client_key_exchange{exchange_keys = ExchangeKeys}, Version) ->
{?CLIENT_KEY_EXCHANGE, encode_client_key(ExchangeKeys, Version)};
encode_handshake(#certificate_verify{signature = BinSig, hashsign_algorithm = HashSign}, Version) ->
EncSig = enc_sign(HashSign, BinSig, Version),
{?CERTIFICATE_VERIFY, EncSig};
encode_handshake(#finished{verify_data = VerifyData}, _Version) ->
{?FINISHED, VerifyData}.
encode_hello_extensions(#hello_extensions{} = Extensions) ->
encode_hello_extensions(hello_extensions_list(Extensions), <<>>).
encode_hello_extensions([], <<>>) ->
<<>>;
encode_hello_extensions([], Acc) ->
Size = byte_size(Acc),
<<?UINT16(Size), Acc/binary>>;
encode_hello_extensions([#alpn{extension_data = ExtensionData} | Rest], Acc) ->
Len = byte_size(ExtensionData),
ExtLen = Len + 2,
encode_hello_extensions(Rest, <<?UINT16(?ALPN_EXT), ?UINT16(ExtLen), ?UINT16(Len),
ExtensionData/binary, Acc/binary>>);
encode_hello_extensions([#next_protocol_negotiation{extension_data = ExtensionData} | Rest], Acc) ->
Len = byte_size(ExtensionData),
encode_hello_extensions(Rest, <<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len),
ExtensionData/binary, Acc/binary>>);
encode_hello_extensions([#renegotiation_info{renegotiated_connection = undefined} | Rest], Acc) ->
encode_hello_extensions(Rest, Acc);
encode_hello_extensions([#renegotiation_info{renegotiated_connection = ?byte(0) = Info} | Rest], Acc) ->
Len = byte_size(Info),
encode_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info/binary, Acc/binary>>);
encode_hello_extensions([#renegotiation_info{renegotiated_connection = Info} | Rest], Acc) ->
InfoLen = byte_size(Info),
Len = InfoLen +1,
encode_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), ?BYTE(InfoLen),
Info/binary, Acc/binary>>);
encode_hello_extensions([#elliptic_curves{elliptic_curve_list = EllipticCurves} | Rest], Acc) ->
EllipticCurveList = << <<(tls_v1:oid_to_enum(X)):16>> || X <- EllipticCurves>>,
ListLen = byte_size(EllipticCurveList),
Len = ListLen + 2,
encode_hello_extensions(Rest, <<?UINT16(?ELLIPTIC_CURVES_EXT),
?UINT16(Len), ?UINT16(ListLen), EllipticCurveList/binary, Acc/binary>>);
encode_hello_extensions([#ec_point_formats{ec_point_format_list = ECPointFormats} | Rest], Acc) ->
ECPointFormatList = list_to_binary(ECPointFormats),
ListLen = byte_size(ECPointFormatList),
Len = ListLen + 1,
encode_hello_extensions(Rest, <<?UINT16(?EC_POINT_FORMATS_EXT),
?UINT16(Len), ?BYTE(ListLen), ECPointFormatList/binary, Acc/binary>>);
encode_hello_extensions([#srp{username = UserName} | Rest], Acc) ->
SRPLen = byte_size(UserName),
Len = SRPLen + 2,
encode_hello_extensions(Rest, <<?UINT16(?SRP_EXT), ?UINT16(Len), ?BYTE(SRPLen),
UserName/binary, Acc/binary>>);
encode_hello_extensions([#hash_sign_algos{hash_sign_algos = HashSignAlgos} | Rest], Acc) ->
SignAlgoList = << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> ||
{Hash, Sign} <- HashSignAlgos >>,
ListLen = byte_size(SignAlgoList),
Len = ListLen + 2,
encode_hello_extensions(Rest, <<?UINT16(?SIGNATURE_ALGORITHMS_EXT),
?UINT16(Len), ?UINT16(ListLen), SignAlgoList/binary, Acc/binary>>);
encode_hello_extensions([#sni{hostname = Hostname} | Rest], Acc) ->
HostLen = length(Hostname),
HostnameBin = list_to_binary(Hostname),
% Hostname type (1 byte) + Hostname length (2 bytes) + Hostname (HostLen bytes)
ServerNameLength = 1 + 2 + HostLen,
% ServerNameListSize (2 bytes) + ServerNameLength
ExtLength = 2 + ServerNameLength,
encode_hello_extensions(Rest, <<?UINT16(?SNI_EXT), ?UINT16(ExtLength),
?UINT16(ServerNameLength),
?BYTE(?SNI_NAMETYPE_HOST_NAME),
?UINT16(HostLen), HostnameBin/binary,
Acc/binary>>).
encode_client_protocol_negotiation(undefined, _) ->
undefined;
encode_client_protocol_negotiation(_, false) ->
#next_protocol_negotiation{extension_data = <<>>};
encode_client_protocol_negotiation(_, _) ->
undefined.
encode_protocols_advertised_on_server(undefined) ->
undefined;
encode_protocols_advertised_on_server(Protocols) ->
#next_protocol_negotiation{extension_data = lists:foldl(fun encode_protocol/2, <<>>, Protocols)}.
%%====================================================================
%% Decode handshake
%%====================================================================
decode_handshake(_, ?HELLO_REQUEST, <<>>) ->
#hello_request{};
decode_handshake(_, ?NEXT_PROTOCOL, <<?BYTE(SelectedProtocolLength),
SelectedProtocol:SelectedProtocolLength/binary,
?BYTE(PaddingLength), _Padding:PaddingLength/binary>>) ->
#next_protocol{selected_protocol = SelectedProtocol};
decode_handshake(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
?BYTE(SID_length), Session_ID:SID_length/binary,
Cipher_suite:2/binary, ?BYTE(Comp_method)>>) ->
#server_hello{
server_version = {Major,Minor},
random = Random,
session_id = Session_ID,
cipher_suite = Cipher_suite,
compression_method = Comp_method,
extensions = #hello_extensions{}};
decode_handshake(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
?BYTE(SID_length), Session_ID:SID_length/binary,
Cipher_suite:2/binary, ?BYTE(Comp_method),
?UINT16(ExtLen), Extensions:ExtLen/binary>>) ->
HelloExtensions = decode_hello_extensions(Extensions),
#server_hello{
server_version = {Major,Minor},
random = Random,
session_id = Session_ID,
cipher_suite = Cipher_suite,
compression_method = Comp_method,
extensions = HelloExtensions};
decode_handshake(_Version, ?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>) ->
#certificate{asn1_certificates = certs_to_list(ASN1Certs)};
decode_handshake(_Version, ?SERVER_KEY_EXCHANGE, Keys) ->
#server_key_exchange{exchange_keys = Keys};
decode_handshake({Major, Minor}, ?CERTIFICATE_REQUEST,
<<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary,
?UINT16(HashSignsLen), HashSigns:HashSignsLen/binary,
?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>)
when Major >= 3, Minor >= 3 ->
HashSignAlgos = [{ssl_cipher:hash_algorithm(Hash), ssl_cipher:sign_algorithm(Sign)} ||
<<?BYTE(Hash), ?BYTE(Sign)>> <= HashSigns],
#certificate_request{certificate_types = CertTypes,
hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos},
certificate_authorities = CertAuths};
decode_handshake(_Version, ?CERTIFICATE_REQUEST,
<<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary,
?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>) ->
#certificate_request{certificate_types = CertTypes,
certificate_authorities = CertAuths};
decode_handshake(_Version, ?SERVER_HELLO_DONE, <<>>) ->
#server_hello_done{};
decode_handshake({Major, Minor}, ?CERTIFICATE_VERIFY,<<HashSign:2/binary, ?UINT16(SignLen),
Signature:SignLen/binary>>)
when Major == 3, Minor >= 3 ->
#certificate_verify{hashsign_algorithm = dec_hashsign(HashSign), signature = Signature};
decode_handshake(_Version, ?CERTIFICATE_VERIFY,<<?UINT16(SignLen), Signature:SignLen/binary>>)->
#certificate_verify{signature = Signature};
decode_handshake(_Version, ?CLIENT_KEY_EXCHANGE, PKEPMS) ->
#client_key_exchange{exchange_keys = PKEPMS};
decode_handshake(_Version, ?FINISHED, VerifyData) ->
#finished{verify_data = VerifyData};
decode_handshake(_, Message, _) ->
throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, {unknown_or_malformed_handshake, Message})).
%%--------------------------------------------------------------------
-spec decode_hello_extensions({client, binary()} | binary()) -> #hello_extensions{}.
%%
%% Description: Decodes TLS hello extensions
%%--------------------------------------------------------------------
decode_hello_extensions({client, <<>>}) ->
#hello_extensions{};
decode_hello_extensions({client, <<?UINT16(ExtLen), Extensions:ExtLen/binary>>}) ->
decode_hello_extensions(Extensions);
decode_hello_extensions(Extensions) ->
dec_hello_extensions(Extensions, #hello_extensions{}).
%%--------------------------------------------------------------------
-spec decode_server_key(binary(), ssl_cipher:key_algo(), ssl_record:ssl_version()) ->
#server_key_params{}.
%%
%% Description: Decode server_key data and return appropriate type
%%--------------------------------------------------------------------
decode_server_key(ServerKey, Type, Version) ->
dec_server_key(ServerKey, key_exchange_alg(Type), Version).
%%--------------------------------------------------------------------
-spec decode_client_key(binary(), ssl_cipher:key_algo(), ssl_record:ssl_version()) ->
#encrypted_premaster_secret{}
| #client_diffie_hellman_public{}
| #client_ec_diffie_hellman_public{}
| #client_psk_identity{}
| #client_dhe_psk_identity{}
| #client_rsa_psk_identity{}
| #client_srp_public{}.
%%
%% Description: Decode client_key data and return appropriate type
%%--------------------------------------------------------------------
decode_client_key(ClientKey, Type, Version) ->
dec_client_key(ClientKey, key_exchange_alg(Type), Version).
%%--------------------------------------------------------------------
-spec decode_suites('2_bytes'|'3_bytes', binary()) -> list().
%%
%% Description:
%%--------------------------------------------------------------------
decode_suites('2_bytes', Dec) ->
from_2bytes(Dec);
decode_suites('3_bytes', Dec) ->
from_3bytes(Dec).
%%====================================================================
%% Cipher suite handling
%%====================================================================
available_suites(UserSuites, Version) ->
VersionSuites = ssl_cipher:all_suites(Version) ++ ssl_cipher:anonymous_suites(Version),
lists:filtermap(fun(Suite) -> lists:member(Suite, VersionSuites) end, UserSuites).
available_suites(ServerCert, UserSuites, Version, undefined, Curve) ->
ssl_cipher:filter(ServerCert, available_suites(UserSuites, Version))
-- unavailable_ecc_suites(Curve);
available_suites(ServerCert, UserSuites, Version, HashSigns, Curve) ->
Suites = available_suites(ServerCert, UserSuites, Version, undefined, Curve),
filter_hashsigns(Suites, [ssl_cipher:suite_definition(Suite) || Suite <- Suites], HashSigns, []).
available_signature_algs(undefined, _) ->
undefined;
available_signature_algs(SupportedHashSigns, Version) when Version >= {3, 3} ->
#hash_sign_algos{hash_sign_algos = SupportedHashSigns};
available_signature_algs(_, _) ->
undefined.
available_signature_algs(undefined, SupportedHashSigns, _, Version) when
Version >= {3,3} ->
SupportedHashSigns;
available_signature_algs(#hash_sign_algos{hash_sign_algos = ClientHashSigns}, SupportedHashSigns,
_, Version) when Version >= {3,3} ->
sets:to_list(sets:intersection(sets:from_list(ClientHashSigns),
sets:from_list(SupportedHashSigns)));
available_signature_algs(_, _, _, _) ->
undefined.
cipher_suites(Suites, Renegotiation, true) ->
%% TLS_FALLBACK_SCSV should be placed last -RFC7507
cipher_suites(Suites, Renegotiation) ++ [?TLS_FALLBACK_SCSV];
cipher_suites(Suites, Renegotiation, false) ->
cipher_suites(Suites, Renegotiation).
cipher_suites(Suites, false) ->
[?TLS_EMPTY_RENEGOTIATION_INFO_SCSV | Suites];
cipher_suites(Suites, true) ->
Suites.
%%--------------------------------------------------------------------
-spec prf(ssl_record:ssl_version(), non_neg_integer(), binary(), binary(), [binary()], non_neg_integer()) ->
{ok, binary()} | {error, undefined}.
%%
%% Description: use the TLS PRF to generate key material
%%--------------------------------------------------------------------
prf({3,0}, _, _, _, _, _) ->
{error, undefined};
prf({3,_N}, PRFAlgo, Secret, Label, Seed, WantedLength) ->
{ok, tls_v1:prf(PRFAlgo, Secret, Label, Seed, WantedLength)}.
select_session(SuggestedSessionId, CipherSuites, HashSigns, Compressions, Port, #session{ecc = ECCCurve} =
Session, Version,
#ssl_options{ciphers = UserSuites, honor_cipher_order = HonorCipherOrder} = SslOpts,
Cache, CacheCb, Cert) ->
{SessionId, Resumed} = ssl_session:server_id(Port, SuggestedSessionId,
SslOpts, Cert,
Cache, CacheCb),
case Resumed of
undefined ->
Suites = available_suites(Cert, UserSuites, Version, HashSigns, ECCCurve),
CipherSuite = select_cipher_suite(CipherSuites, Suites, HonorCipherOrder),
Compression = select_compression(Compressions),
{new, Session#session{session_id = SessionId,
cipher_suite = CipherSuite,
compression_method = Compression}};
_ ->
{resumed, Resumed}
end.
supported_ecc({Major, Minor}) when ((Major == 3) and (Minor >= 1)) orelse (Major > 3) ->
Curves = tls_v1:ecc_curves(Minor),
#elliptic_curves{elliptic_curve_list = Curves};
supported_ecc(_) ->
#elliptic_curves{elliptic_curve_list = []}.
premaster_secret(OtherPublicDhKey, MyPrivateKey, #'DHParameter'{} = Params) ->
try
public_key:compute_key(OtherPublicDhKey, MyPrivateKey, Params)
catch
error:computation_failed ->
throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER))
end;
premaster_secret(PublicDhKey, PrivateDhKey, #server_dh_params{dh_p = Prime, dh_g = Base}) ->
try
crypto:compute_key(dh, PublicDhKey, PrivateDhKey, [Prime, Base])
catch
error:computation_failed ->
throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER))
end;
premaster_secret(#client_srp_public{srp_a = ClientPublicKey}, ServerKey, #srp_user{prime = Prime,
verifier = Verifier}) ->
case crypto:compute_key(srp, ClientPublicKey, ServerKey, {host, [Verifier, Prime, '6a']}) of
error ->
throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER));
PremasterSecret ->
PremasterSecret
end;
premaster_secret(#server_srp_params{srp_n = Prime, srp_g = Generator, srp_s = Salt, srp_b = Public},
ClientKeys, {Username, Password}) ->
case ssl_srp_primes:check_srp_params(Generator, Prime) of
ok ->
DerivedKey = crypto:hash(sha, [Salt, crypto:hash(sha, [Username, <<$:>>, Password])]),
case crypto:compute_key(srp, Public, ClientKeys, {user, [DerivedKey, Prime, Generator, '6a']}) of
error ->
throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER));
PremasterSecret ->
PremasterSecret
end;
_ ->
throw(?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER))
end;
premaster_secret(#client_rsa_psk_identity{
identity = PSKIdentity,
exchange_keys = #encrypted_premaster_secret{premaster_secret = EncPMS}
}, #'RSAPrivateKey'{} = Key, PSKLookup) ->
PremasterSecret = premaster_secret(EncPMS, Key),
psk_secret(PSKIdentity, PSKLookup, PremasterSecret);
premaster_secret(#server_dhe_psk_params{
hint = IdentityHint,
dh_params = #server_dh_params{dh_y = PublicDhKey} = Params},
PrivateDhKey,
LookupFun) ->
PremasterSecret = premaster_secret(PublicDhKey, PrivateDhKey, Params),
psk_secret(IdentityHint, LookupFun, PremasterSecret);
premaster_secret({rsa_psk, PSKIdentity}, PSKLookup, RSAPremasterSecret) ->
psk_secret(PSKIdentity, PSKLookup, RSAPremasterSecret).
premaster_secret(#client_dhe_psk_identity{
identity = PSKIdentity,
dh_public = PublicDhKey}, PrivateKey, #'DHParameter'{} = Params, PSKLookup) ->
PremasterSecret = premaster_secret(PublicDhKey, PrivateKey, Params),
psk_secret(PSKIdentity, PSKLookup, PremasterSecret).
premaster_secret(#client_psk_identity{identity = PSKIdentity}, PSKLookup) ->
psk_secret(PSKIdentity, PSKLookup);
premaster_secret({psk, PSKIdentity}, PSKLookup) ->
psk_secret(PSKIdentity, PSKLookup);
premaster_secret(#'ECPoint'{} = ECPoint, #'ECPrivateKey'{} = ECDHKeys) ->
public_key:compute_key(ECPoint, ECDHKeys);
premaster_secret(EncSecret, #'RSAPrivateKey'{} = RSAPrivateKey) ->
try public_key:decrypt_private(EncSecret, RSAPrivateKey,
[{rsa_pad, rsa_pkcs1_padding}])
catch
_:_ ->
throw(?ALERT_REC(?FATAL, ?DECRYPT_ERROR))
end.
%%====================================================================
%% Extensions handling
%%====================================================================
client_hello_extensions(Version, CipherSuites,
#ssl_options{signature_algs = SupportedHashSigns,
eccs = SupportedECCs} = SslOpts, ConnectionStates, Renegotiation) ->
{EcPointFormats, EllipticCurves} =
case advertises_ec_ciphers(lists:map(fun ssl_cipher:suite_definition/1, CipherSuites)) of
true ->
client_ecc_extensions(SupportedECCs);
false ->
{undefined, undefined}
end,
SRP = srp_user(SslOpts),
#hello_extensions{
renegotiation_info = renegotiation_info(tls_record, client,
ConnectionStates, Renegotiation),
srp = SRP,
signature_algs = available_signature_algs(SupportedHashSigns, Version),
ec_point_formats = EcPointFormats,
elliptic_curves = EllipticCurves,
alpn = encode_alpn(SslOpts#ssl_options.alpn_advertised_protocols, Renegotiation),
next_protocol_negotiation =
encode_client_protocol_negotiation(SslOpts#ssl_options.next_protocol_selector,
Renegotiation),
sni = sni(SslOpts#ssl_options.server_name_indication)}.
handle_client_hello_extensions(RecordCB, Random, ClientCipherSuites,
#hello_extensions{renegotiation_info = Info,
srp = SRP,
ec_point_formats = ECCFormat,
alpn = ALPN,
next_protocol_negotiation = NextProtocolNegotiation}, Version,
#ssl_options{secure_renegotiate = SecureRenegotation,
alpn_preferred_protocols = ALPNPreferredProtocols} = Opts,
#session{cipher_suite = NegotiatedCipherSuite,
compression_method = Compression} = Session0,
ConnectionStates0, Renegotiation) ->
Session = handle_srp_extension(SRP, Session0),
ConnectionStates = handle_renegotiation_extension(server, RecordCB, Version, Info,
Random, NegotiatedCipherSuite,
ClientCipherSuites, Compression,
ConnectionStates0, Renegotiation, SecureRenegotation),
ServerHelloExtensions = #hello_extensions{
renegotiation_info = renegotiation_info(RecordCB, server,
ConnectionStates, Renegotiation),
ec_point_formats = server_ecc_extension(Version, ECCFormat)
},
%% If we receive an ALPN extension and have ALPN configured for this connection,
%% we handle it. Otherwise we check for the NPN extension.
if
ALPN =/= undefined, ALPNPreferredProtocols =/= undefined ->
case handle_alpn_extension(ALPNPreferredProtocols, decode_alpn(ALPN)) of
#alert{} = Alert ->
Alert;
Protocol ->
{Session, ConnectionStates, Protocol,
ServerHelloExtensions#hello_extensions{alpn=encode_alpn([Protocol], Renegotiation)}}
end;
true ->
ProtocolsToAdvertise = handle_next_protocol_extension(NextProtocolNegotiation, Renegotiation, Opts),
{Session, ConnectionStates, undefined,
ServerHelloExtensions#hello_extensions{next_protocol_negotiation=
encode_protocols_advertised_on_server(ProtocolsToAdvertise)}}
end.
handle_server_hello_extensions(RecordCB, Random, CipherSuite, Compression,
#hello_extensions{renegotiation_info = Info,
alpn = ALPN,
next_protocol_negotiation = NextProtocolNegotiation}, Version,
#ssl_options{secure_renegotiate = SecureRenegotation,
next_protocol_selector = NextProtoSelector},
ConnectionStates0, Renegotiation) ->
ConnectionStates = handle_renegotiation_extension(client, RecordCB, Version, Info, Random,
CipherSuite, undefined,
Compression, ConnectionStates0,
Renegotiation, SecureRenegotation),
%% If we receive an ALPN extension then this is the protocol selected,
%% otherwise handle the NPN extension.
case decode_alpn(ALPN) of
%% ServerHello contains exactly one protocol: the one selected.
%% We also ignore the ALPN extension during renegotiation (see encode_alpn/2).
[Protocol] when not Renegotiation ->
{ConnectionStates, alpn, Protocol};
undefined ->
case handle_next_protocol(NextProtocolNegotiation, NextProtoSelector, Renegotiation) of
#alert{} = Alert ->
Alert;
Protocol ->
{ConnectionStates, npn, Protocol}
end;
{error, Reason} ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, Reason);
[] ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, no_protocols_in_server_hello);
[_|_] ->
?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, too_many_protocols_in_server_hello)
end.