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-rw-r--r--lib/ssl/src/dtls_handshake.erl204
1 files changed, 134 insertions, 70 deletions
diff --git a/lib/ssl/src/dtls_handshake.erl b/lib/ssl/src/dtls_handshake.erl
index 6e9bf99e52..4a381745d4 100644
--- a/lib/ssl/src/dtls_handshake.erl
+++ b/lib/ssl/src/dtls_handshake.erl
@@ -37,7 +37,7 @@
-export([fragment_handshake/2, encode_handshake/3]).
%% Handshake decodeing
--export([get_dtls_handshake/3]).
+-export([get_dtls_handshake/4]).
-type dtls_handshake() :: #client_hello{} | #hello_verify_request{} |
ssl_handshake:ssl_handshake().
@@ -79,7 +79,7 @@ client_hello(Host, Port, Cookie, ConnectionStates,
Extensions = ssl_handshake:client_hello_extensions(TLSVersion, CipherSuites,
SslOpts, ConnectionStates,
- Renegotiation),
+ Renegotiation, undefined),
Id = ssl_session:client_id({Host, Port, SslOpts}, Cache, CacheCb, OwnCert),
#client_hello{session_id = Id,
@@ -151,15 +151,15 @@ encode_handshake(Handshake, Version, Seq) ->
%%--------------------------------------------------------------------
%%--------------------------------------------------------------------
--spec get_dtls_handshake(ssl_record:ssl_version(), binary(), #protocol_buffers{}) ->
+-spec get_dtls_handshake(ssl_record:ssl_version(), binary(), #protocol_buffers{}, #ssl_options{}) ->
{[dtls_handshake()], #protocol_buffers{}}.
%%
%% Description: Given buffered and new data from dtls_record, collects
%% and returns it as a list of handshake messages, also returns
%% possible leftover data in the new "protocol_buffers".
%%--------------------------------------------------------------------
-get_dtls_handshake(Version, Fragment, ProtocolBuffers) ->
- handle_fragments(Version, Fragment, ProtocolBuffers, []).
+get_dtls_handshake(Version, Fragment, ProtocolBuffers, Options) ->
+ handle_fragments(Version, Fragment, ProtocolBuffers, Options, []).
%%--------------------------------------------------------------------
%%% Internal functions
@@ -169,10 +169,7 @@ 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,
@@ -181,6 +178,8 @@ handle_client_hello(Version,
Renegotiation) ->
case dtls_record:is_acceptable_version(Version, Versions) of
true ->
+ Curves = maps:get(elliptic_curves, HelloExt, undefined),
+ ClientHashSigns = maps:get(signature_algs, HelloExt, undefined),
TLSVersion = dtls_v1:corresponding_tls_version(Version),
AvailableHashSigns = ssl_handshake:available_signature_algs(
ClientHashSigns, SupportedHashSigns, Cert,TLSVersion),
@@ -194,8 +193,8 @@ handle_client_hello(Version,
no_suite ->
?ALERT_REC(?FATAL, ?INSUFFICIENT_SECURITY);
_ ->
- #{key_exchange := KeyExAlg} = ssl_cipher_format:suite_definition(CipherSuite),
- case ssl_handshake:select_hashsign(ClientHashSigns, Cert, KeyExAlg,
+ #{key_exchange := KeyExAlg} = ssl_cipher_format:suite_bin_to_map(CipherSuite),
+ case ssl_handshake:select_hashsign({ClientHashSigns, undefined}, Cert, KeyExAlg,
SupportedHashSigns, TLSVersion) of
#alert{} = Alert ->
Alert;
@@ -256,7 +255,8 @@ 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,
+ dtls_v1:corresponding_tls_version({Major, Minor})),
{?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
?BYTE(SIDLength), SessionID/binary,
@@ -311,20 +311,21 @@ address_to_bin({A,B,C,D,E,F,G,H}, Port) ->
%%--------------------------------------------------------------------
-handle_fragments(Version, FragmentData, Buffers0, Acc) ->
+handle_fragments(Version, FragmentData, Buffers0, Options, Acc) ->
Fragments = decode_handshake_fragments(FragmentData),
- do_handle_fragments(Version, Fragments, Buffers0, Acc).
+ do_handle_fragments(Version, Fragments, Buffers0, Options, Acc).
-do_handle_fragments(_, [], Buffers, Acc) ->
+do_handle_fragments(_, [], Buffers, _Options, Acc) ->
{lists:reverse(Acc), Buffers};
-do_handle_fragments(Version, [Fragment | Fragments], Buffers0, Acc) ->
+do_handle_fragments(Version, [Fragment | Fragments], Buffers0, Options, Acc) ->
case reassemble(Version, Fragment, Buffers0) of
{more_data, Buffers} when Fragments == [] ->
{lists:reverse(Acc), Buffers};
{more_data, Buffers} ->
- do_handle_fragments(Version, Fragments, Buffers, Acc);
- {HsPacket, Buffers} ->
- do_handle_fragments(Version, Fragments, Buffers, [HsPacket | Acc])
+ do_handle_fragments(Version, Fragments, Buffers, Options, Acc);
+ {{Handshake, _} = HsPacket, Buffers} ->
+ ssl_logger:debug(Options#ssl_options.log_level, inbound, 'handshake', Handshake),
+ do_handle_fragments(Version, Fragments, Buffers, Options, [HsPacket | Acc])
end.
decode_handshake(Version, <<?BYTE(Type), Bin/binary>>) ->
@@ -332,7 +333,7 @@ decode_handshake(Version, <<?BYTE(Type), Bin/binary>>) ->
decode_handshake(_, ?HELLO_REQUEST, <<>>) ->
#hello_request{};
-decode_handshake(_Version, ?CLIENT_HELLO, <<?UINT24(_), ?UINT16(_),
+decode_handshake(Version, ?CLIENT_HELLO, <<?UINT24(_), ?UINT16(_),
?UINT24(_), ?UINT24(_),
?BYTE(Major), ?BYTE(Minor), Random:32/binary,
?BYTE(SID_length), Session_ID:SID_length/binary,
@@ -340,8 +341,10 @@ decode_handshake(_Version, ?CLIENT_HELLO, <<?UINT24(_), ?UINT16(_),
?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}),
+ TLSVersion = dtls_v1:corresponding_tls_version(Version),
+ LegacyVersion = dtls_v1:corresponding_tls_version({Major, Minor}),
+ Exts = ssl_handshake:decode_vector(Extensions),
+ DecodedExtensions = ssl_handshake:decode_hello_extensions(Exts, TLSVersion, LegacyVersion, client),
#client_hello{
client_version = {Major,Minor},
@@ -362,9 +365,9 @@ decode_handshake(_Version, ?HELLO_VERIFY_REQUEST, <<?UINT24(_), ?UINT16(_),
decode_handshake(Version, Tag, <<?UINT24(_), ?UINT16(_),
?UINT24(_), ?UINT24(_), Msg/binary>>) ->
%% DTLS specifics stripped
- decode_tls_thandshake(Version, Tag, Msg).
+ decode_tls_handshake(Version, Tag, Msg).
-decode_tls_thandshake(Version, Tag, Msg) ->
+decode_tls_handshake(Version, Tag, Msg) ->
TLSVersion = dtls_v1:corresponding_tls_version(Version),
ssl_handshake:decode_handshake(TLSVersion, Tag, Msg).
@@ -425,74 +428,135 @@ merge_fragment(Frag0, [Frag1 | Rest]) ->
Frag ->
merge_fragment(Frag, Rest)
end.
-%% Duplicate
+
+
+%% Duplicate (fully contained fragment)
+%% 2,5 _ _ P P P P P
+%% 2,5 _ _ C C C C C
merge_fragments(#handshake_fragment{
- fragment_offset = PreviousOffSet,
+ fragment_offset = PreviousOffSet,
fragment_length = PreviousLen,
fragment = PreviousData
- } = Previous,
+ } = Previous,
#handshake_fragment{
fragment_offset = PreviousOffSet,
fragment_length = PreviousLen,
fragment = PreviousData}) ->
Previous;
-%% Lager fragment save new data
+%% Duplicate (fully contained fragment)
+%% 2,5 _ _ P P P P P
+%% 2,2 _ _ C C
+%% 0,3 X X X
+%% 5,3 _ _ _ _ _ X X X
merge_fragments(#handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = PreviousLen,
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen
+ } = Previous,
+ #handshake_fragment{
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen})
+ when PreviousOffset =< CurrentOffset andalso
+ CurrentOffset =< PreviousOffset + PreviousLen andalso
+ CurrentOffset + CurrentLen =< PreviousOffset + PreviousLen ->
+ Previous;
+
+%% Fully overlapping fragments
+%% 2,5 _ _ P P P P P
+%% 0,8 C C C C C C C C
+merge_fragments(#handshake_fragment{
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen
+ },
+ #handshake_fragment{
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen} = Current)
+ when CurrentOffset =< PreviousOffset andalso
+ CurrentOffset + CurrentLen >= PreviousOffset + PreviousLen ->
+ Current;
+
+%% Overlapping fragments
+%% 2,5 _ _ P P P P P
+%% 0,3 C C C
+merge_fragments(#handshake_fragment{
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen,
fragment = PreviousData
- } = Previous,
- #handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = CurrentLen,
- fragment = CurrentData}) when CurrentLen > PreviousLen ->
- NewLength = CurrentLen - PreviousLen,
- <<_:PreviousLen/binary, NewData/binary>> = CurrentData,
+ } = Previous,
+ #handshake_fragment{
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen,
+ fragment = CurrentData})
+ when CurrentOffset < PreviousOffset andalso
+ CurrentOffset + CurrentLen < PreviousOffset + PreviousLen ->
+ NewDataLen = PreviousOffset - CurrentOffset,
+ <<NewData:NewDataLen/binary, _/binary>> = CurrentData,
Previous#handshake_fragment{
- fragment_length = PreviousLen + NewLength,
- fragment = <<PreviousData/binary, NewData/binary>>
+ fragment_length = PreviousLen + NewDataLen,
+ fragment = <<NewData/binary, PreviousData/binary>>
};
-%% Smaller fragment
+%% Overlapping fragments
+%% 2,5 _ _ P P P P P
+%% 5,3 _ _ _ _ _ C C C
merge_fragments(#handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = PreviousLen
- } = Previous,
- #handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = CurrentLen}) when CurrentLen < PreviousLen ->
- Previous;
-%% Next fragment, might be overlapping
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen,
+ fragment = PreviousData
+ } = Previous,
+ #handshake_fragment{
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen,
+ fragment = CurrentData})
+ when CurrentOffset > PreviousOffset andalso
+ CurrentOffset < PreviousOffset + PreviousLen ->
+ NewDataLen = CurrentOffset + CurrentLen - (PreviousOffset + PreviousLen),
+ DropLen = CurrentLen - NewDataLen,
+ <<_:DropLen/binary, NewData/binary>> = CurrentData,
+ Previous#handshake_fragment{
+ fragment_length = PreviousLen + NewDataLen,
+ fragment = <<PreviousData/binary, NewData/binary>>
+ };
+
+%% Adjacent fragments
+%% 2,5 _ _ P P P P P
+%% 7,3 _ _ _ _ _ _ _ C C C
merge_fragments(#handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = PreviousLen,
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen,
fragment = PreviousData
- } = Previous,
- #handshake_fragment{
- fragment_offset = CurrentOffSet,
- fragment_length = CurrentLen,
- fragment = CurrentData})
- when PreviousOffSet + PreviousLen >= CurrentOffSet andalso
- PreviousOffSet + PreviousLen < CurrentOffSet + CurrentLen ->
- CurrentStart = PreviousOffSet + PreviousLen - CurrentOffSet,
- <<_:CurrentStart/bytes, Data/binary>> = CurrentData,
+ } = Previous,
+ #handshake_fragment{
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen,
+ fragment = CurrentData})
+ when CurrentOffset =:= PreviousOffset + PreviousLen ->
Previous#handshake_fragment{
- fragment_length = PreviousLen + CurrentLen - CurrentStart,
- fragment = <<PreviousData/binary, Data/binary>>};
-%% already fully contained fragment
+ fragment_length = PreviousLen + CurrentLen,
+ fragment = <<PreviousData/binary, CurrentData/binary>>
+ };
+
+%% Adjacent fragments
+%% 2,5 _ _ P P P P P
+%% 0,2 C C
merge_fragments(#handshake_fragment{
- fragment_offset = PreviousOffSet,
- fragment_length = PreviousLen
- } = Previous,
+ fragment_offset = PreviousOffset,
+ fragment_length = PreviousLen,
+ fragment = PreviousData
+ } = Previous,
#handshake_fragment{
- fragment_offset = CurrentOffSet,
- fragment_length = CurrentLen})
- when PreviousOffSet + PreviousLen >= CurrentOffSet andalso
- PreviousOffSet + PreviousLen >= CurrentOffSet + CurrentLen ->
- Previous;
+ fragment_offset = CurrentOffset,
+ fragment_length = CurrentLen,
+ fragment = CurrentData})
+ when PreviousOffset =:= CurrentOffset + CurrentLen ->
+ Previous#handshake_fragment{
+ fragment_length = PreviousLen + CurrentLen,
+ fragment = <<CurrentData/binary, PreviousData/binary>>
+ };
%% No merge there is a gap
+%% 3,5 _ _ _ P P P P
+%% 0,2 C C
merge_fragments(Previous, Current) ->
[Previous, Current].
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-31 19:53:10 +0000