diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ssl/src/ssl_handshake.erl | 12 | ||||
| -rw-r--r-- | lib/ssl/src/tls_connection_1_3.erl | 57 | ||||
| -rw-r--r-- | lib/ssl/src/tls_handshake_1_3.erl | 230 |
3 files changed, 209 insertions, 90 deletions
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl index 6b1e3b6e07..de4f26f759 100644 --- a/lib/ssl/src/ssl_handshake.erl +++ b/lib/ssl/src/ssl_handshake.erl @@ -76,7 +76,7 @@ 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, empty_extensions/2, add_server_share/2 + select_hashsign_algs/3, empty_extensions/2, add_server_share/3 ]). -export([get_cert_params/1]). @@ -1150,12 +1150,18 @@ maybe_add_key_share(HelloExtensions, KeyShare) -> HelloExtensions#{key_share => #key_share_client_hello{ client_shares = ClientShares}}. -add_server_share(Extensions, KeyShare) -> +add_server_share(server_hello, Extensions, KeyShare) -> #key_share_server_hello{server_share = ServerShare0} = KeyShare, %% Keep only public keys ServerShare = kse_remove_private_key(ServerShare0), Extensions#{key_share => #key_share_server_hello{ - server_share = ServerShare}}. + server_share = ServerShare}}; +add_server_share(hello_retry_request, Extensions, + #key_share_server_hello{ + server_share = #key_share_entry{group = Group}}) -> + Extensions#{key_share => #key_share_hello_retry_request{ + selected_group = Group}}. + kse_remove_private_key(#key_share_entry{ group = Group, diff --git a/lib/ssl/src/tls_connection_1_3.erl b/lib/ssl/src/tls_connection_1_3.erl index de786d0875..71ac6a9310 100644 --- a/lib/ssl/src/tls_connection_1_3.erl +++ b/lib/ssl/src/tls_connection_1_3.erl @@ -113,27 +113,27 @@ wait_finished/4 ]). -start(internal, - #client_hello{} = Hello, - #state{connection_states = _ConnectionStates0, - ssl_options = #ssl_options{ciphers = _ServerCiphers, - signature_algs = _ServerSignAlgs, - signature_algs_cert = _SignatureSchemes, %% TODO: Check?? - supported_groups = _ServerGroups0, - versions = _Versions} = SslOpts, - session = #session{own_certificate = Cert}} = State0, - _Module) -> - Env = #{cert => Cert}, - case tls_handshake_1_3:handle_client_hello(Hello, SslOpts, Env) of +start(internal, + #change_cipher_spec{} = ChangeCipherSpec, State0, _Module) -> + case tls_handshake_1_3:do_start(ChangeCipherSpec, State0) of #alert{} = Alert -> ssl_connection:handle_own_alert(Alert, {3,4}, start, State0); - M -> - %% update connection_states with cipher - State = update_state(State0, M), - {next_state, negotiated, State, [{next_event, internal, M}]} - - end. + State1 -> + {Record, State} = tls_connection:next_record(State1), + tls_connection:next_event(?FUNCTION_NAME, Record, State) + end; +start(internal, #client_hello{} = Hello, State0, _Module) -> + case tls_handshake_1_3:do_start(Hello, State0) of + #alert{} = Alert -> + ssl_connection:handle_own_alert(Alert, {3,4}, start, State0); + {State, _, start} -> + {next_state, start, State, []}; + {State, Context, negotiated} -> + {next_state, negotiated, State, [{next_event, internal, Context}]} + end; +start(Type, Msg, State, Connection) -> + ssl_connection:handle_common_event(Type, Msg, ?FUNCTION_NAME, State, Connection). negotiated(internal, Map, State0, _Module) -> @@ -166,24 +166,3 @@ wait_finished(internal, end; wait_finished(Type, Msg, State, Connection) -> ssl_connection:handle_common_event(Type, Msg, ?FUNCTION_NAME, State, Connection). - - -update_state(#state{connection_states = ConnectionStates0, - connection_env = CEnv, - session = Session} = State, - #{cipher := Cipher, - key_share := KeyShare, - session_id := SessionId}) -> - #{security_parameters := SecParamsR0} = PendingRead = - maps:get(pending_read, ConnectionStates0), - #{security_parameters := SecParamsW0} = PendingWrite = - maps:get(pending_write, ConnectionStates0), - SecParamsR = ssl_cipher:security_parameters_1_3(SecParamsR0, Cipher), - SecParamsW = ssl_cipher:security_parameters_1_3(SecParamsW0, Cipher), - ConnectionStates = - ConnectionStates0#{pending_read => PendingRead#{security_parameters => SecParamsR}, - pending_write => PendingWrite#{security_parameters => SecParamsW}}, - State#state{connection_states = ConnectionStates, - key_share = KeyShare, - session = Session#session{session_id = SessionId}, - connection_env = CEnv#connection_env{negotiated_version = {3,4}}}. diff --git a/lib/ssl/src/tls_handshake_1_3.erl b/lib/ssl/src/tls_handshake_1_3.erl index 6a6de4b988..3bc1290361 100644 --- a/lib/ssl/src/tls_handshake_1_3.erl +++ b/lib/ssl/src/tls_handshake_1_3.erl @@ -36,38 +36,49 @@ %% Encode -export([encode_handshake/1, decode_handshake/2]). -%% Handshake --export([handle_client_hello/3]). - %% Create handshake messages -export([certificate/5, certificate_verify/4, encrypted_extensions/0, server_hello/4]). --export([do_negotiated/2, +-export([do_start/2, + do_negotiated/2, do_wait_finished/2]). %%==================================================================== %% Create handshake messages %%==================================================================== -server_hello(SessionId, KeyShare, ConnectionStates, _Map) -> +server_hello(MsgType, SessionId, KeyShare, ConnectionStates) -> #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates, read), - Extensions = server_hello_extensions(KeyShare), + Extensions = server_hello_extensions(MsgType, KeyShare), #server_hello{server_version = {3,3}, %% legacy_version cipher_suite = SecParams#security_parameters.cipher_suite, compression_method = 0, %% legacy attribute - random = SecParams#security_parameters.server_random, + random = server_hello_random(MsgType, SecParams), session_id = SessionId, extensions = Extensions }. -server_hello_extensions(KeyShare) -> +server_hello_extensions(MsgType, KeyShare) -> SupportedVersions = #server_hello_selected_version{selected_version = {3,4}}, Extensions = #{server_hello_selected_version => SupportedVersions}, - ssl_handshake:add_server_share(Extensions, KeyShare). + ssl_handshake:add_server_share(MsgType, Extensions, KeyShare). + +server_hello_random(server_hello, #security_parameters{server_random = Random}) -> + Random; +%% For reasons of backward compatibility with middleboxes (see +%% Appendix D.4), the HelloRetryRequest message uses the same structure +%% as the ServerHello, but with Random set to the special value of the +%% SHA-256 of "HelloRetryRequest": +%% +%% CF 21 AD 74 E5 9A 61 11 BE 1D 8C 02 1E 65 B8 91 +%% C2 A2 11 16 7A BB 8C 5E 07 9E 09 E2 C8 A8 33 9C +server_hello_random(hello_retry_request, _) -> + crypto:hash(sha256, "HelloRetryRequest"). + %% TODO: implement support for encrypted_extensions encrypted_extensions() -> @@ -75,6 +86,7 @@ encrypted_extensions() -> extensions = #{} }. + %% TODO: use maybe monad for error handling! %% enum { %% X509(0), @@ -361,20 +373,44 @@ build_content(Context, THash) -> Prefix = binary:copy(<<32>>, 64), <<Prefix/binary,Context/binary,?BYTE(0),THash/binary>>. + %%==================================================================== %% Handle handshake messages %%==================================================================== -handle_client_hello(#client_hello{cipher_suites = ClientCiphers, - session_id = SessionId, - extensions = Extensions} = _Hello, - #ssl_options{ciphers = ServerCiphers, - signature_algs = ServerSignAlgs, - signature_algs_cert = _SignatureSchemes, %% TODO: Check?? - supported_groups = ServerGroups0} = _SslOpts, - Env) -> - Cert = maps:get(cert, Env, undefined), +do_start(#change_cipher_spec{}, + #state{connection_states = _ConnectionStates0, + session = #session{session_id = _SessionId, + own_certificate = _OwnCert}, + ssl_options = #ssl_options{} = _SslOpts, + key_share = _KeyShare, + handshake_env = #handshake_env{tls_handshake_history = _HHistory0}, + static_env = #static_env{ + cert_db = _CertDbHandle, + cert_db_ref = _CertDbRef, + socket = _Socket, + transport_cb = _Transport} + } = State0) -> + %% {Ref,Maybe} = maybe(), + + try + + State0 + + catch + {_Ref, {state_not_implemented, State}} -> + ?ALERT_REC(?FATAL, ?INTERNAL_ERROR, {state_not_implemented, State}) + end; +do_start(#client_hello{cipher_suites = ClientCiphers, + session_id = SessionId, + extensions = Extensions} = _Hello, + #state{connection_states = _ConnectionStates0, + ssl_options = #ssl_options{ciphers = ServerCiphers, + signature_algs = ServerSignAlgs, + signature_algs_cert = _SignatureSchemes, %% TODO: check! + supported_groups = ServerGroups0}, + session = #session{own_certificate = Cert}} = State0) -> ClientGroups0 = maps:get(elliptic_curves, Extensions, undefined), ClientGroups = get_supported_groups(ClientGroups0), @@ -398,11 +434,9 @@ handle_client_hello(#client_hello{cipher_suites = ClientCiphers, %% and a signature algorithm/certificate pair to authenticate itself to %% the client. Cipher = Maybe(select_cipher_suite(ClientCiphers, ServerCiphers)), - Group = Maybe(select_server_group(ServerGroups, ClientGroups)), + Groups = Maybe(select_common_groups(ServerGroups, ClientGroups)), Maybe(validate_key_share(ClientGroups, ClientShares)), - ClientPubKey = Maybe(get_client_public_key(Group, ClientShares)), - {PublicKeyAlgo, SignAlgo, SignHash} = get_certificate_params(Cert), %% Check if client supports signature algorithm of server certificate @@ -411,14 +445,31 @@ handle_client_hello(#client_hello{cipher_suites = ClientCiphers, %% Select signature algorithm (used in CertificateVerify message). SelectedSignAlg = Maybe(select_sign_algo(PublicKeyAlgo, ClientSignAlgs, ServerSignAlgs)), + %% Select client public key. If no public key found in ClientShares or + %% ClientShares is empty, trigger HelloRetryRequest as we were able + %% to find an acceptable set of parameters but the ClientHello does not + %% contain sufficient information. + {Group, ClientPubKey} = get_client_public_key(Groups, ClientShares), + %% Generate server_share KeyShare = ssl_cipher:generate_server_share(Group), - _Ret = #{cipher => Cipher, - group => Group, - sign_alg => SelectedSignAlg, - client_share => ClientPubKey, - key_share => KeyShare, - session_id => SessionId} + + State1 = update_start_state(State0, Cipher, KeyShare, SessionId), + + %% 4.1.4. Hello Retry Request + %% + %% The server will send this message in response to a ClientHello + %% message if it is able to find an acceptable set of parameters but the + %% ClientHello does not contain sufficient information to proceed with + %% the handshake. + {State2, NextState} = + Maybe(send_hello_retry_request(State1, ClientPubKey, KeyShare, SessionId)), + + %% TODO: Add Context to state? + Context = #{group => Group, + sign_alg => SelectedSignAlg, + client_share => ClientPubKey}, + {State2, Context, NextState} %% TODO: %% - session handling @@ -430,9 +481,6 @@ handle_client_hello(#client_hello{cipher_suites = ClientCiphers, ?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY, no_suitable_groups); {Ref, illegal_parameter} -> ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); - {Ref, {hello_retry_request, _Group0}} -> - %% TODO - ?ALERT_REC(?FATAL, ?INTERNAL_ERROR, "hello_retry_request not implemented"); {Ref, no_suitable_cipher} -> ?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY, no_suitable_cipher); {Ref, {insufficient_security, no_suitable_signature_algorithm}} -> @@ -445,7 +493,7 @@ handle_client_hello(#client_hello{cipher_suites = ClientCiphers, do_negotiated(#{client_share := ClientKey, group := SelectedGroup, sign_alg := SignatureScheme - } = Map, + }, #state{connection_states = ConnectionStates0, session = #session{session_id = SessionId, own_certificate = OwnCert}, @@ -464,7 +512,7 @@ do_negotiated(#{client_share := ClientKey, try %% Create server_hello %% Extensions: supported_versions, key_share, (pre_shared_key) - ServerHello = server_hello(SessionId, KeyShare, ConnectionStates0, Map), + ServerHello = server_hello(server_hello, SessionId, KeyShare, ConnectionStates0), {State1, _} = tls_connection:send_handshake(ServerHello, State0), @@ -597,6 +645,56 @@ compare_verify_data(_, _) -> {error, decrypt_error}. +send_hello_retry_request(#state{connection_states = ConnectionStates0} = State0, + no_suitable_key, KeyShare, SessionId) -> + ServerHello = server_hello(hello_retry_request, SessionId, KeyShare, ConnectionStates0), + {State1, _} = tls_connection:send_handshake(ServerHello, State0), + + %% TODO: Fix handshake history! + State2 = replace_ch1_with_message_hash(State1), + + {ok, {State2, start}}; +send_hello_retry_request(State0, _, _, _) -> + %% Suitable key found. + {ok, {State0, negotiated}}. + + +%% 4.4.1. The Transcript Hash +%% +%% As an exception to this general rule, when the server responds to a +%% ClientHello with a HelloRetryRequest, the value of ClientHello1 is +%% replaced with a special synthetic handshake message of handshake type +%% "message_hash" containing Hash(ClientHello1). I.e., +%% +%% Transcript-Hash(ClientHello1, HelloRetryRequest, ... Mn) = +%% Hash(message_hash || /* Handshake type */ +%% 00 00 Hash.length || /* Handshake message length (bytes) */ +%% Hash(ClientHello1) || /* Hash of ClientHello1 */ +%% HelloRetryRequest || ... || Mn) +%% +%% NOTE: Hash.length is used in practice (openssl) and not message length! +%% It is most probably a fault in the RFC. +replace_ch1_with_message_hash(#state{connection_states = ConnectionStates, + handshake_env = + #handshake_env{ + tls_handshake_history = + {[HRR,CH1|HHistory], LM}} = HSEnv} = State0) -> + #{security_parameters := SecParamsR} = + ssl_record:pending_connection_state(ConnectionStates, read), + #security_parameters{prf_algorithm = HKDFAlgo} = SecParamsR, + MessageHash = message_hash(CH1, HKDFAlgo), + State0#state{handshake_env = + HSEnv#handshake_env{ + tls_handshake_history = + {[HRR,MessageHash|HHistory], LM}}}. + + +message_hash(ClientHello1, HKDFAlgo) -> + [?MESSAGE_HASH, + 0,0,ssl_cipher:hash_size(HKDFAlgo), + crypto:hash(HKDFAlgo, ClientHello1)]. + + calculate_handshake_secrets(ClientKey, SelectedGroup, KeyShare, #state{connection_states = ConnectionStates, handshake_env = @@ -721,6 +819,24 @@ update_connection_state(ConnectionState = #{security_parameters := SecurityParam cipher_state => cipher_init(Key, IV, FinishedKey)}. +update_start_state(#state{connection_states = ConnectionStates0, + connection_env = CEnv, + session = Session} = State, + Cipher, KeyShare, SessionId) -> + #{security_parameters := SecParamsR0} = PendingRead = + maps:get(pending_read, ConnectionStates0), + #{security_parameters := SecParamsW0} = PendingWrite = + maps:get(pending_write, ConnectionStates0), + SecParamsR = ssl_cipher:security_parameters_1_3(SecParamsR0, Cipher), + SecParamsW = ssl_cipher:security_parameters_1_3(SecParamsW0, Cipher), + ConnectionStates = + ConnectionStates0#{pending_read => PendingRead#{security_parameters => SecParamsR}, + pending_write => PendingWrite#{security_parameters => SecParamsW}}, + State#state{connection_states = ConnectionStates, + key_share = KeyShare, + session = Session#session{session_id = SessionId}, + connection_env = CEnv#connection_env{negotiated_version = {3,4}}}. + cipher_init(Key, IV, FinishedKey) -> #cipher_state{key = Key, @@ -733,17 +849,19 @@ cipher_init(Key, IV, FinishedKey) -> %% "supported_groups" and the groups supported by the server, then the %% server MUST abort the handshake with a "handshake_failure" or an %% "insufficient_security" alert. -select_server_group(_, []) -> +select_common_groups(_, []) -> {error, {insufficient_security, no_suitable_groups}}; -select_server_group(ServerGroups, [C|ClientGroups]) -> - case lists:member(C, ServerGroups) of - true -> - {ok, C}; - false -> - select_server_group(ServerGroups, ClientGroups) +select_common_groups(ServerGroups, ClientGroups) -> + Fun = fun(E) -> lists:member(E, ClientGroups) end, + case lists:filter(Fun, ServerGroups) of + [] -> + {error, {insufficient_security, no_suitable_groups}}; + L -> + {ok, L} end. + %% RFC 8446 - 4.2.8. Key Share %% This vector MAY be empty if the client is requesting a %% HelloRetryRequest. Each KeyShareEntry value MUST correspond to a @@ -771,20 +889,36 @@ validate_key_share([_|ClientGroups], [_|_] = ClientShares) -> validate_key_share(ClientGroups, ClientShares). -get_client_public_key(Group, ClientShares) -> +get_client_public_key([Group|_] = Groups, ClientShares) -> + get_client_public_key(Groups, ClientShares, Group). +%% +get_client_public_key(_, [], PreferredGroup) -> + {PreferredGroup, no_suitable_key}; +get_client_public_key([], _, PreferredGroup) -> + {PreferredGroup, no_suitable_key}; +get_client_public_key([Group|Groups], ClientShares, PreferredGroup) -> case lists:keysearch(Group, 2, ClientShares) of {value, {_, _, ClientPublicKey}} -> - {ok, ClientPublicKey}; + {Group, ClientPublicKey}; false -> - %% 4.1.4. Hello Retry Request - %% - %% The server will send this message in response to a ClientHello - %% message if it is able to find an acceptable set of parameters but the - %% ClientHello does not contain sufficient information to proceed with - %% the handshake. - {error, {hello_retry_request, Group}} + get_client_public_key(Groups, ClientShares, PreferredGroup) end. + +%% get_client_public_key(Group, ClientShares) -> +%% case lists:keysearch(Group, 2, ClientShares) of +%% {value, {_, _, ClientPublicKey}} -> +%% ClientPublicKey; +%% false -> +%% %% 4.1.4. Hello Retry Request +%% %% +%% %% The server will send this message in response to a ClientHello +%% %% message if it is able to find an acceptable set of parameters but the +%% %% ClientHello does not contain sufficient information to proceed with +%% %% the handshake. +%% no_suitable_key +%% end. + select_cipher_suite([], _) -> {error, no_suitable_cipher}; select_cipher_suite([Cipher|ClientCiphers], ServerCiphers) -> |