diff options
Diffstat (limited to 'lib/ssl/src/tls_handshake.erl')
| -rw-r--r-- | lib/ssl/src/tls_handshake.erl | 234 |
1 files changed, 185 insertions, 49 deletions
diff --git a/lib/ssl/src/tls_handshake.erl b/lib/ssl/src/tls_handshake.erl index 19a5eb0348..37265e0759 100644 --- a/lib/ssl/src/tls_handshake.erl +++ b/lib/ssl/src/tls_handshake.erl @@ -26,14 +26,17 @@ -module(tls_handshake). -include("tls_handshake.hrl"). +-include("tls_handshake_1_3.hrl"). -include("tls_record.hrl"). -include("ssl_alert.hrl"). -include("ssl_internal.hrl"). -include("ssl_cipher.hrl"). +-include("ssl_api.hrl"). -include_lib("public_key/include/public_key.hrl"). +-include_lib("kernel/include/logger.hrl"). %% Handshake handling --export([client_hello/8, hello/4]). +-export([client_hello/9, hello/4]). %% Handshake encoding -export([encode_handshake/2]). @@ -47,8 +50,9 @@ %% Handshake handling %%==================================================================== %%-------------------------------------------------------------------- --spec client_hello(host(), inet:port_number(), ssl_record:connection_states(), - #ssl_options{}, integer(), atom(), boolean(), der_cert()) -> +-spec client_hello(ssl:host(), inet:port_number(), ssl_record:connection_states(), + #ssl_options{}, integer(), atom(), boolean(), der_cert(), + #key_share_client_hello{} | undefined) -> #client_hello{}. %% %% Description: Creates a client hello message. @@ -58,19 +62,32 @@ client_hello(Host, Port, ConnectionStates, ciphers = UserSuites, fallback = Fallback } = SslOpts, - Cache, CacheCb, Renegotiation, OwnCert) -> + Cache, CacheCb, Renegotiation, OwnCert, KeyShare) -> Version = tls_record:highest_protocol_version(Versions), + + %% In TLS 1.3, the client indicates its version preferences in the + %% "supported_versions" extension (Section 4.2.1) and the + %% legacy_version field MUST be set to 0x0303, which is the version + %% number for TLS 1.2. + LegacyVersion = + case tls_record:is_higher(Version, {3,2}) of + true -> + {3,3}; + false -> + Version + end, #{security_parameters := SecParams} = ssl_record:pending_connection_state(ConnectionStates, read), AvailableCipherSuites = ssl_handshake:available_suites(UserSuites, Version), Extensions = ssl_handshake:client_hello_extensions(Version, AvailableCipherSuites, SslOpts, ConnectionStates, - Renegotiation), + Renegotiation, + KeyShare), CipherSuites = ssl_handshake:cipher_suites(AvailableCipherSuites, Renegotiation, Fallback), Id = ssl_session:client_id({Host, Port, SslOpts}, Cache, CacheCb, OwnCert), #client_hello{session_id = Id, - client_version = Version, + client_version = LegacyVersion, cipher_suites = CipherSuites, compression_methods = ssl_record:compressions(), random = SecParams#security_parameters.client_random, @@ -81,21 +98,98 @@ client_hello(Host, Port, ConnectionStates, -spec hello(#server_hello{} | #client_hello{}, #ssl_options{}, ssl_record:connection_states() | {inet:port_number(), #session{}, db_handle(), atom(), ssl_record:connection_states(), - binary() | undefined, ssl_cipher_format:key_algo()}, + binary() | undefined, ssl:kex_algo()}, boolean()) -> - {tls_record:tls_version(), session_id(), + {tls_record:tls_version(), ssl:session_id(), ssl_record:connection_states(), alpn | npn, binary() | undefined}| {tls_record:tls_version(), {resumed | new, #session{}}, ssl_record:connection_states(), binary() | undefined, - #hello_extensions{}, {ssl_cipher_format:hash(), ssl_cipher_format:sign_algo()} | - undefined} | #alert{}. + HelloExt::map(), {ssl:hash(), ssl:sign_algo()} | + undefined} | {atom(), atom()} |#alert{}. %% %% Description: Handles a received hello message %%-------------------------------------------------------------------- -hello(#server_hello{server_version = Version, random = Random, + + +%% TLS 1.3 - Section 4.1.3 +%% TLS 1.3 clients receiving a ServerHello indicating TLS 1.2 or below +%% MUST check that the last eight bytes are not equal to either of these +%% values. +hello(#server_hello{server_version = {Major, Minor}, + random = <<_:24/binary,Down:8/binary>>}, + #ssl_options{versions = [{M,N}|_]}, _, _) + when (M > 3 orelse M =:= 3 andalso N >= 4) andalso %% TLS 1.3 client + (Major =:= 3 andalso Minor =:= 3 andalso %% Negotiating TLS 1.2 + Down =:= ?RANDOM_OVERRIDE_TLS12) orelse + + (M > 3 orelse M =:= 3 andalso N >= 4) andalso %% TLS 1.3 client + (Major =:= 3 andalso Minor < 3 andalso %% Negotiating TLS 1.1 or prior + Down =:= ?RANDOM_OVERRIDE_TLS11) -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); + +%% TLS 1.2 clients SHOULD also check that the last eight bytes are not +%% equal to the second value if the ServerHello indicates TLS 1.1 or below. +hello(#server_hello{server_version = {Major, Minor}, + random = <<_:24/binary,Down:8/binary>>}, + #ssl_options{versions = [{M,N}|_]}, _, _) + when (M =:= 3 andalso N =:= 3) andalso %% TLS 1.2 client + (Major =:= 3 andalso Minor < 3 andalso %% Negotiating TLS 1.1 or prior + Down =:= ?RANDOM_OVERRIDE_TLS11) -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); + + +%% TLS 1.3 - 4.2.1. Supported Versions +%% If the "supported_versions" extension in the ServerHello contains a +%% version not offered by the client or contains a version prior to TLS +%% 1.3, the client MUST abort the handshake with an "illegal_parameter" +%% alert. +%%-------------------------------------------------------------------- +%% TLS 1.2 Client +%% +%% - If "supported_version" is present (ServerHello): +%% - Abort handshake with an "illegal_parameter" alert +hello(#server_hello{server_version = LegacyVersion, + random = Random, cipher_suite = CipherSuite, compression_method = Compression, - session_id = SessionId, extensions = HelloExt}, + session_id = SessionId, + extensions = #{server_hello_selected_version := + #server_hello_selected_version{selected_version = Version} = HelloExt} + }, + #ssl_options{versions = SupportedVersions} = SslOpt, + ConnectionStates0, Renegotiation) -> + %% In TLS 1.3, the TLS server indicates its version using the "supported_versions" extension + %% (Section 4.2.1), and the legacy_version field MUST be set to 0x0303, which is the version + %% number for TLS 1.2. + %% The "supported_versions" extension is supported from TLS 1.2. + case LegacyVersion > {3,3} orelse + LegacyVersion =:= {3,3} andalso Version < {3,3} of + true -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); + false -> + case tls_record:is_acceptable_version(Version, SupportedVersions) of + true -> + case Version of + {3,3} -> + %% TLS 1.2 ServerHello with "supported_versions" (special case) + handle_server_hello_extensions(Version, SessionId, Random, CipherSuite, + Compression, HelloExt, SslOpt, + ConnectionStates0, Renegotiation); + {3,4} -> + %% TLS 1.3 + {next_state, wait_sh} + end; + false -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER) + end + end; + +hello(#server_hello{server_version = Version, + random = Random, + cipher_suite = CipherSuite, + compression_method = Compression, + session_id = SessionId, + extensions = HelloExt}, #ssl_options{versions = SupportedVersions} = SslOpt, ConnectionStates0, Renegotiation) -> case tls_record:is_acceptable_version(Version, SupportedVersions) of @@ -106,6 +200,36 @@ hello(#server_hello{server_version = Version, random = Random, false -> ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION) end; + + +%% TLS 1.2 Server +%% - If "supported_versions" is present (ClientHello): +%% - Select version from "supported_versions" (ignore ClientHello.legacy_version) +%% - If server only supports versions greater than "supported_versions": +%% - Abort handshake with a "protocol_version" alert (*) +%% - If "supported_versions" is absent (ClientHello): +%% - Negotiate the minimum of ClientHello.legacy_version and TLS 1.2 (**) +%% - If server only supports versions greater than ClientHello.legacy_version: +%% - Abort handshake with a "protocol_version" alert +%% +%% (*) Sends alert even if there is a gap in supported versions +%% e.g. Server 1.0,1.2 Client 1.1,1.3 +%% (**) Current implementation can negotiate a version not supported by the client +%% e.g. Server 1.0,1.2 Client 1.1 -> ServerHello 1.0 +hello(#client_hello{client_version = _ClientVersion, + cipher_suites = CipherSuites, + extensions = #{client_hello_versions := + #client_hello_versions{versions = ClientVersions} + }} = Hello, + #ssl_options{versions = Versions} = SslOpts, + Info, Renegotiation) -> + try + Version = ssl_handshake:select_supported_version(ClientVersions, Versions), + do_hello(Version, Versions, CipherSuites, Hello, SslOpts, Info, Renegotiation) + catch + _:_ -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE, malformed_handshake_data) + end; hello(#client_hello{client_version = ClientVersion, cipher_suites = CipherSuites} = Hello, @@ -113,18 +237,7 @@ hello(#client_hello{client_version = ClientVersion, Info, Renegotiation) -> try Version = ssl_handshake:select_version(tls_record, ClientVersion, Versions), - case ssl_cipher:is_fallback(CipherSuites) of - true -> - Highest = tls_record:highest_protocol_version(Versions), - case tls_record:is_higher(Highest, Version) of - true -> - ?ALERT_REC(?FATAL, ?INAPPROPRIATE_FALLBACK); - false -> - handle_client_hello(Version, Hello, SslOpts, Info, Renegotiation) - end; - false -> - handle_client_hello(Version, Hello, SslOpts, Info, Renegotiation) - end + do_hello(Version, Versions, CipherSuites, Hello, SslOpts, Info, Renegotiation) catch error:{case_clause,{asn1, Asn1Reason}} -> %% ASN-1 decode of certificate somehow failed @@ -139,7 +252,8 @@ hello(#client_hello{client_version = ClientVersion, %%-------------------------------------------------------------------- %%-------------------------------------------------------------------- --spec encode_handshake(tls_handshake(), tls_record:tls_version()) -> iolist(). +-spec encode_handshake(tls_handshake() | tls_handshake_1_3:tls_handshake_1_3(), + tls_record:tls_version()) -> iolist(). %% %% Description: Encode a handshake packet %%-------------------------------------------------------------------- @@ -156,7 +270,7 @@ encode_handshake(Package, Version) -> %%-------------------------------------------------------------------- -spec get_tls_handshake(tls_record:tls_version(), binary(), binary() | iolist(), #ssl_options{}) -> - {[tls_handshake()], binary()}. + {[{tls_handshake(), binary()}], binary()}. %% %% Description: Given buffered and new data from ssl_record, collects %% and returns it as a list of handshake messages, also returns leftover @@ -175,10 +289,7 @@ handle_client_hello(Version, cipher_suites = CipherSuites, compression_methods = Compressions, random = Random, - extensions = - #hello_extensions{elliptic_curves = Curves, - signature_algs = ClientHashSigns} - = HelloExt}, + extensions = HelloExt}, #ssl_options{versions = Versions, signature_algs = SupportedHashSigns, eccs = SupportedECCs, @@ -187,6 +298,9 @@ handle_client_hello(Version, Renegotiation) -> case tls_record:is_acceptable_version(Version, Versions) of true -> + Curves = maps:get(elliptic_curves, HelloExt, undefined), + ClientHashSigns = maps:get(signature_algs, HelloExt, undefined), + ClientSignatureSchemes = maps:get(signature_algs_cert, HelloExt, undefined), AvailableHashSigns = ssl_handshake:available_signature_algs( ClientHashSigns, SupportedHashSigns, Cert, Version), ECCCurve = ssl_handshake:select_curve(Curves, SupportedECCs, ECCOrder), @@ -199,9 +313,11 @@ handle_client_hello(Version, no_suite -> ?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY, no_suitable_ciphers); _ -> - #{key_exchange := KeyExAlg} = ssl_cipher_format:suite_definition(CipherSuite), - case ssl_handshake:select_hashsign(ClientHashSigns, Cert, KeyExAlg, - SupportedHashSigns, Version) of + #{key_exchange := KeyExAlg} = ssl_cipher_format:suite_bin_to_map(CipherSuite), + case ssl_handshake:select_hashsign({ClientHashSigns, ClientSignatureSchemes}, + Cert, KeyExAlg, + SupportedHashSigns, + Version) of #alert{} = Alert -> Alert; HashSign -> @@ -223,8 +339,6 @@ handle_client_hello_extensions(Version, Type, Random, CipherSuites, HelloExt, Version, SslOpts, Session0, ConnectionStates0, Renegotiation) of - #alert{} = Alert -> - Alert; {Session, ConnectionStates, Protocol, ServerHelloExt} -> {Version, {Type, Session}, ConnectionStates, Protocol, ServerHelloExt, HashSign} @@ -235,19 +349,37 @@ handle_client_hello_extensions(Version, Type, Random, CipherSuites, handle_server_hello_extensions(Version, SessionId, Random, CipherSuite, Compression, HelloExt, SslOpt, ConnectionStates0, Renegotiation) -> - case ssl_handshake:handle_server_hello_extensions(tls_record, Random, CipherSuite, + try ssl_handshake:handle_server_hello_extensions(tls_record, Random, CipherSuite, Compression, HelloExt, Version, SslOpt, ConnectionStates0, - Renegotiation) of - #alert{} = Alert -> - Alert; + Renegotiation) of {ConnectionStates, ProtoExt, Protocol} -> {Version, SessionId, ConnectionStates, ProtoExt, Protocol} + catch throw:Alert -> + Alert + end. + + +do_hello(undefined, _Versions, _CipherSuites, _Hello, _SslOpts, _Info, _Renegotiation) -> + ?ALERT_REC(?FATAL, ?PROTOCOL_VERSION); +do_hello(Version, Versions, CipherSuites, Hello, SslOpts, Info, Renegotiation) -> + case ssl_cipher:is_fallback(CipherSuites) of + true -> + Highest = tls_record:highest_protocol_version(Versions), + case tls_record:is_higher(Highest, Version) of + true -> + ?ALERT_REC(?FATAL, ?INAPPROPRIATE_FALLBACK); + false -> + handle_client_hello(Version, Hello, SslOpts, Info, Renegotiation) + end; + false -> + handle_client_hello(Version, Hello, SslOpts, Info, Renegotiation) end. + %%-------------------------------------------------------------------- -enc_handshake(#hello_request{}, _Version) -> +enc_handshake(#hello_request{}, {3, N}) when N < 4 -> {?HELLO_REQUEST, <<>>}; -enc_handshake(#client_hello{client_version = {Major, Minor}, +enc_handshake(#client_hello{client_version = {Major, Minor} = Version, random = Random, session_id = SessionID, cipher_suites = CipherSuites, @@ -258,13 +390,14 @@ enc_handshake(#client_hello{client_version = {Major, Minor}, CmLength = byte_size(BinCompMethods), BinCipherSuites = list_to_binary(CipherSuites), CsLength = byte_size(BinCipherSuites), - ExtensionsBin = ssl_handshake:encode_hello_extensions(HelloExtensions), + ExtensionsBin = ssl_handshake:encode_hello_extensions(HelloExtensions, Version), {?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary, ?BYTE(SIDLength), SessionID/binary, ?UINT16(CsLength), BinCipherSuites/binary, ?BYTE(CmLength), BinCompMethods/binary, ExtensionsBin/binary>>}; - +enc_handshake(HandshakeMsg, {3, 4}) -> + tls_handshake_1_3:encode_handshake(HandshakeMsg); enc_handshake(HandshakeMsg, Version) -> ssl_handshake:encode_handshake(HandshakeMsg, Version). @@ -275,6 +408,7 @@ get_tls_handshake_aux(Version, <<?BYTE(Type), ?UINT24(Length), Raw = <<?BYTE(Type), ?UINT24(Length), Body/binary>>, try decode_handshake(Version, Type, Body) of Handshake -> + ssl_logger:debug(Opts#ssl_options.log_level, inbound, 'handshake', Handshake), get_tls_handshake_aux(Version, Rest, Opts, [{Handshake,Raw} | Acc]) catch _:_ -> @@ -283,24 +417,26 @@ get_tls_handshake_aux(Version, <<?BYTE(Type), ?UINT24(Length), get_tls_handshake_aux(_Version, Data, _, Acc) -> {lists:reverse(Acc), Data}. -decode_handshake(_, ?HELLO_REQUEST, <<>>) -> +decode_handshake({3, N}, ?HELLO_REQUEST, <<>>) when N < 4 -> #hello_request{}; -decode_handshake(_Version, ?CLIENT_HELLO, +decode_handshake(Version, ?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary, ?BYTE(SID_length), Session_ID:SID_length/binary, ?UINT16(Cs_length), CipherSuites:Cs_length/binary, ?BYTE(Cm_length), Comp_methods:Cm_length/binary, Extensions/binary>>) -> - DecodedExtensions = ssl_handshake:decode_hello_extensions({client, Extensions}), + Exts = ssl_handshake:decode_vector(Extensions), + DecodedExtensions = ssl_handshake:decode_hello_extensions(Exts, Version, {Major, Minor}, + client_hello), #client_hello{ client_version = {Major,Minor}, random = Random, session_id = Session_ID, cipher_suites = ssl_handshake:decode_suites('2_bytes', CipherSuites), - compression_methods = Comp_methods, + compression_methods = erlang:binary_to_list(Comp_methods), extensions = DecodedExtensions }; +decode_handshake({3, 4}, Tag, Msg) -> + tls_handshake_1_3:decode_handshake(Tag, Msg); decode_handshake(Version, Tag, Msg) -> ssl_handshake:decode_handshake(Version, Tag, Msg). - - |