diff options
Diffstat (limited to 'lib/ssl/src/dtls_record.erl')
-rw-r--r-- | lib/ssl/src/dtls_record.erl | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/lib/ssl/src/dtls_record.erl b/lib/ssl/src/dtls_record.erl index 2dcc6efc91..316de05532 100644 --- a/lib/ssl/src/dtls_record.erl +++ b/lib/ssl/src/dtls_record.erl @@ -30,7 +30,7 @@ -include("ssl_cipher.hrl"). %% Handling of incoming data --export([get_dtls_records/2, init_connection_states/2, empty_connection_state/1]). +-export([get_dtls_records/3, init_connection_states/2, empty_connection_state/1]). -export([save_current_connection_state/2, next_epoch/2, get_connection_state_by_epoch/3, replay_detect/2, init_connection_state_seq/2, current_connection_state_epoch/2]). @@ -163,17 +163,25 @@ current_connection_state_epoch(#{current_write := #{epoch := Epoch}}, Epoch. %%-------------------------------------------------------------------- --spec get_dtls_records(binary(), binary()) -> {[binary()], binary()} | #alert{}. +-spec get_dtls_records(binary(), [dtls_version()], binary()) -> {[binary()], binary()} | #alert{}. %% %% Description: Given old buffer and new data from UDP/SCTP, packs up a records %% and returns it as a list of tls_compressed binaries also returns leftover %% data %%-------------------------------------------------------------------- -get_dtls_records(Data, <<>>) -> - get_dtls_records_aux(Data, []); -get_dtls_records(Data, Buffer) -> - get_dtls_records_aux(list_to_binary([Buffer, Data]), []). - +get_dtls_records(Data, Versions, Buffer) -> + BinData = list_to_binary([Buffer, Data]), + case erlang:byte_size(BinData) of + N when N >= 3 -> + case assert_version(BinData, Versions) of + true -> + get_dtls_records_aux(BinData, []); + false -> + ?ALERT_REC(?FATAL, ?BAD_RECORD_MAC) + end; + _ -> + get_dtls_records_aux(BinData, []) + end. %%==================================================================== %% Encoding DTLS records @@ -397,6 +405,8 @@ initial_connection_state(ConnectionEnd, BeastMitigation) -> client_verify_data => undefined, server_verify_data => undefined }. +assert_version(<<?BYTE(_), ?BYTE(MajVer), ?BYTE(MinVer), _/binary>>, Versions) -> + is_acceptable_version({MajVer, MinVer}, Versions). get_dtls_records_aux(<<?BYTE(?APPLICATION_DATA),?BYTE(MajVer),?BYTE(MinVer), ?UINT16(Epoch), ?UINT48(SequenceNumber), @@ -431,15 +441,11 @@ get_dtls_records_aux(<<?BYTE(?CHANGE_CIPHER_SPEC),?BYTE(MajVer),?BYTE(MinVer), epoch = Epoch, sequence_number = SequenceNumber, fragment = Data} | Acc]); -get_dtls_records_aux(<<0:1, _CT:7, ?BYTE(_MajVer), ?BYTE(_MinVer), +get_dtls_records_aux(<<?BYTE(_), ?BYTE(_MajVer), ?BYTE(_MinVer), ?UINT16(Length), _/binary>>, _Acc) when Length > ?MAX_CIPHER_TEXT_LENGTH -> ?ALERT_REC(?FATAL, ?RECORD_OVERFLOW); -get_dtls_records_aux(<<1:1, Length0:15, _/binary>>,_Acc) - when Length0 > ?MAX_CIPHER_TEXT_LENGTH -> - ?ALERT_REC(?FATAL, ?RECORD_OVERFLOW); - get_dtls_records_aux(Data, Acc) -> case size(Data) =< ?MAX_CIPHER_TEXT_LENGTH + ?INITIAL_BYTES of true -> |