diff options
Diffstat (limited to 'lib/ssl/src/ssl_alert.erl')
| -rw-r--r-- | lib/ssl/src/ssl_alert.erl | 54 |
1 files changed, 42 insertions, 12 deletions
diff --git a/lib/ssl/src/ssl_alert.erl b/lib/ssl/src/ssl_alert.erl index db1535b5ec..3e35e24527 100644 --- a/lib/ssl/src/ssl_alert.erl +++ b/lib/ssl/src/ssl_alert.erl @@ -1,18 +1,19 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2007-2014. All Rights Reserved. +%% Copyright Ericsson AB 2007-2015. All Rights Reserved. %% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. +%% 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 %% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. +%% 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% %% @@ -31,7 +32,7 @@ -include("ssl_record.hrl"). -include("ssl_internal.hrl"). --export([encode/3, alert_txt/1, reason_code/2]). +-export([encode/3, decode/1, alert_txt/1, reason_code/2]). %%==================================================================== %% Internal application API @@ -41,12 +42,21 @@ -spec encode(#alert{}, ssl_record:ssl_version(), #connection_states{}) -> {iolist(), #connection_states{}}. %% -%% Description: +%% Description: Encodes an alert %%-------------------------------------------------------------------- encode(#alert{} = Alert, Version, ConnectionStates) -> ssl_record:encode_alert_record(Alert, Version, ConnectionStates). %%-------------------------------------------------------------------- +-spec decode(binary()) -> [#alert{}] | #alert{}. +%% +%% Description: Decode alert(s), will return a singel own alert if peer +%% sends garbage or too many warning alerts. +%%-------------------------------------------------------------------- +decode(Bin) -> + decode(Bin, [], 0). + +%%-------------------------------------------------------------------- -spec reason_code(#alert{}, client | server) -> closed | {essl, string()}. %% %% Description: Returns the error reason that will be returned to the @@ -71,6 +81,22 @@ alert_txt(#alert{level = Level, description = Description, where = {Mod,Line}}) %%-------------------------------------------------------------------- %%% Internal functions %%-------------------------------------------------------------------- + +%% It is very unlikely that an correct implementation will send more than one alert at the time +%% So it there is more than 10 warning alerts we consider it an error +decode(<<?BYTE(Level), ?BYTE(_), _/binary>>, _, N) when Level == ?WARNING, N > ?MAX_ALERTS -> + ?ALERT_REC(?FATAL, ?DECODE_ERROR); +decode(<<?BYTE(Level), ?BYTE(Description), Rest/binary>>, Acc, N) when Level == ?WARNING -> + Alert = ?ALERT_REC(Level, Description), + decode(Rest, [Alert | Acc], N + 1); +decode(<<?BYTE(Level), ?BYTE(Description), _Rest/binary>>, Acc, _) when Level == ?FATAL-> + Alert = ?ALERT_REC(Level, Description), + lists:reverse([Alert | Acc]); %% No need to decode rest fatal alert will end the connection +decode(<<?BYTE(_Level), _/binary>>, _, _) -> + ?ALERT_REC(?FATAL, ?ILLEGAL_PARAMETER); +decode(<<>>, Acc, _) -> + lists:reverse(Acc, []). + level_txt(?WARNING) -> "Warning:"; level_txt(?FATAL) -> @@ -136,5 +162,9 @@ description_txt(?BAD_CERTIFICATE_HASH_VALUE) -> "bad certificate hash value"; description_txt(?UNKNOWN_PSK_IDENTITY) -> "unknown psk identity"; +description_txt(?INAPPROPRIATE_FALLBACK) -> + "inappropriate fallback"; +description_txt(?NO_APPLICATION_PROTOCOL) -> + "no application protocol"; description_txt(Enum) -> lists:flatten(io_lib:format("unsupported/unknown alert: ~p", [Enum])). |