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-rw-r--r--lib/ssl/doc/src/ssl.xml18
-rw-r--r--lib/ssl/src/dtls_connection.erl3
-rw-r--r--lib/ssl/src/ssl.erl7
-rw-r--r--lib/ssl/src/ssl_internal.hrl3
-rw-r--r--lib/ssl/src/ssl_record.erl43
-rw-r--r--lib/ssl/src/ssl_record.hrl4
-rw-r--r--lib/ssl/src/tls_connection.erl3
-rw-r--r--lib/ssl/test/ssl_basic_SUITE.erl64
8 files changed, 123 insertions, 22 deletions
diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml
index 154664d855..33ece8f769 100644
--- a/lib/ssl/doc/src/ssl.xml
+++ b/lib/ssl/doc/src/ssl.xml
@@ -417,10 +417,24 @@ fun(srp, Username :: string(), UserState :: term()) ->
If set to <c>false</c>, it disables the block cipher padding check
to be able to interoperate with legacy software.</p></item>
- </taglist>
-
<warning><p>Using <c>{padding_check, boolean()}</c> makes TLS
vulnerable to the Poodle attack.</p></warning>
+
+ <tag><c>{beast_mitigation, one_n_minus_one | zero_n | disabled}</c></tag>
+ <item><p>Affects SSL-3.0 and TLS-1.0 connections only. Used to change the BEAST
+ mitigation strategy to interoperate with legacy software.
+ Defaults to <c>one_n_minus_one</c></p>.
+
+ <p><c>one_n_minus_one</c> - Perform 1/n-1 BEAST mitigation.</p>
+
+ <p><c>zero_n</c> - Perform 0/n BEAST mitigation.</p>
+
+ <p><c>disabled</c> - Disable BEAST mitigation.</p></item>
+
+ <warning><p>Using <c>{beast_mitigation, disabled}</c> makes SSL or TLS
+ vulnerable to the BEAST attack.</p></warning>
+ </taglist>
+
</section>
<section>
diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl
index 82d6faee42..60a61bc901 100644
--- a/lib/ssl/src/dtls_connection.erl
+++ b/lib/ssl/src/dtls_connection.erl
@@ -416,7 +416,8 @@ encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) ->
initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User,
{CbModule, DataTag, CloseTag, ErrorTag}) ->
- ConnectionStates = ssl_record:init_connection_states(Role),
+ #ssl_options{beast_mitigation = BeastMitigation} = SSLOptions,
+ ConnectionStates = ssl_record:init_connection_states(Role, BeastMitigation),
SessionCacheCb = case application:get_env(ssl, session_cb) of
{ok, Cb} when is_atom(Cb) ->
diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 51732b4a59..5dc2e583a5 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -725,6 +725,7 @@ handle_options(Opts0, Role) ->
server, Role),
protocol = proplists:get_value(protocol, Opts, tls),
padding_check = proplists:get_value(padding_check, Opts, true),
+ beast_mitigation = handle_option(beast_mitigation, Opts, one_n_minus_one),
fallback = handle_option(fallback, Opts,
proplists:get_value(fallback, Opts,
default_option_role(client,
@@ -746,7 +747,7 @@ handle_options(Opts0, Role) ->
alpn_preferred_protocols, next_protocols_advertised,
client_preferred_next_protocols, log_alert,
server_name_indication, honor_cipher_order, padding_check, crl_check, crl_cache,
- fallback, signature_algs],
+ fallback, signature_algs, beast_mitigation],
SockOpts = lists:foldl(fun(Key, PropList) ->
proplists:delete(Key, PropList)
@@ -986,6 +987,10 @@ validate_option(crl_check, Value) when (Value == best_effort) or (Value == peer)
Value;
validate_option(crl_cache, {Cb, {_Handle, Options}} = Value) when is_atom(Cb) and is_list(Options) ->
Value;
+validate_option(beast_mitigation, Value) when Value == one_n_minus_one orelse
+ Value == zero_n orelse
+ Value == disabled ->
+ Value;
validate_option(Opt, Value) ->
throw({error, {options, {Opt, Value}}}).
diff --git a/lib/ssl/src/ssl_internal.hrl b/lib/ssl/src/ssl_internal.hrl
index 076e663cd4..dddcbdeeda 100644
--- a/lib/ssl/src/ssl_internal.hrl
+++ b/lib/ssl/src/ssl_internal.hrl
@@ -133,6 +133,9 @@
%% the client?
honor_cipher_order = false :: boolean(),
padding_check = true :: boolean(),
+ %%Should we use 1/n-1 or 0/n splitting to mitigate BEAST, or disable
+ %%mitigation entirely?
+ beast_mitigation = one_n_minus_one :: one_n_minus_one | zero_n | disabled,
fallback = false :: boolean(),
crl_check :: boolean() | peer | best_effort,
crl_cache,
diff --git a/lib/ssl/src/ssl_record.erl b/lib/ssl/src/ssl_record.erl
index 866bfcef7e..0a086f5eeb 100644
--- a/lib/ssl/src/ssl_record.erl
+++ b/lib/ssl/src/ssl_record.erl
@@ -30,7 +30,7 @@
-include("ssl_alert.hrl").
%% Connection state handling
--export([init_connection_states/1,
+-export([init_connection_states/2,
current_connection_state/2, pending_connection_state/2,
activate_pending_connection_state/2,
set_security_params/3,
@@ -62,15 +62,16 @@
%%====================================================================
%%--------------------------------------------------------------------
--spec init_connection_states(client | server) -> #connection_states{}.
+-spec init_connection_states(client | server, one_n_minus_one | zero_n | disabled ) ->
+ #connection_states{}.
%%
%% Description: Creates a connection_states record with appropriate
%% values for the initial SSL connection setup.
%%--------------------------------------------------------------------
-init_connection_states(Role) ->
+init_connection_states(Role, BeastMitigation) ->
ConnectionEnd = record_protocol_role(Role),
- Current = initial_connection_state(ConnectionEnd),
- Pending = empty_connection_state(ConnectionEnd),
+ Current = initial_connection_state(ConnectionEnd, BeastMitigation),
+ Pending = empty_connection_state(ConnectionEnd, BeastMitigation),
#connection_states{current_read = Current,
pending_read = Pending,
current_write = Current,
@@ -119,9 +120,10 @@ activate_pending_connection_state(States =
read) ->
NewCurrent = Pending#connection_state{epoch = dtls_next_epoch(Current),
sequence_number = 0},
+ BeastMitigation = Pending#connection_state.beast_mitigation,
SecParams = Pending#connection_state.security_parameters,
ConnectionEnd = SecParams#security_parameters.connection_end,
- EmptyPending = empty_connection_state(ConnectionEnd),
+ EmptyPending = empty_connection_state(ConnectionEnd, BeastMitigation),
SecureRenegotation = NewCurrent#connection_state.secure_renegotiation,
NewPending = EmptyPending#connection_state{secure_renegotiation = SecureRenegotation},
States#connection_states{current_read = NewCurrent,
@@ -134,9 +136,10 @@ activate_pending_connection_state(States =
write) ->
NewCurrent = Pending#connection_state{epoch = dtls_next_epoch(Current),
sequence_number = 0},
+ BeastMitigation = Pending#connection_state.beast_mitigation,
SecParams = Pending#connection_state.security_parameters,
ConnectionEnd = SecParams#security_parameters.connection_end,
- EmptyPending = empty_connection_state(ConnectionEnd),
+ EmptyPending = empty_connection_state(ConnectionEnd, BeastMitigation),
SecureRenegotation = NewCurrent#connection_state.secure_renegotiation,
NewPending = EmptyPending#connection_state{secure_renegotiation = SecureRenegotation},
States#connection_states{current_write = NewCurrent,
@@ -314,12 +317,13 @@ set_pending_cipher_state(#connection_states{pending_read = Read,
encode_handshake(Frag, Version,
#connection_states{current_write =
#connection_state{
+ beast_mitigation = BeastMitigation,
security_parameters =
#security_parameters{bulk_cipher_algorithm = BCA}}} =
ConnectionStates) ->
case iolist_size(Frag) of
N when N > ?MAX_PLAIN_TEXT_LENGTH ->
- Data = split_bin(iolist_to_binary(Frag), ?MAX_PLAIN_TEXT_LENGTH, Version, BCA),
+ Data = split_bin(iolist_to_binary(Frag), ?MAX_PLAIN_TEXT_LENGTH, Version, BCA, BeastMitigation),
encode_iolist(?HANDSHAKE, Data, Version, ConnectionStates);
_ ->
encode_plain_text(?HANDSHAKE, Version, Frag, ConnectionStates)
@@ -352,10 +356,11 @@ encode_change_cipher_spec(Version, ConnectionStates) ->
%%--------------------------------------------------------------------
encode_data(Frag, Version,
#connection_states{current_write = #connection_state{
+ beast_mitigation = BeastMitigation,
security_parameters =
#security_parameters{bulk_cipher_algorithm = BCA}}} =
ConnectionStates) ->
- Data = split_bin(Frag, ?MAX_PLAIN_TEXT_LENGTH, Version, BCA),
+ Data = split_bin(Frag, ?MAX_PLAIN_TEXT_LENGTH, Version, BCA, BeastMitigation),
encode_iolist(?APPLICATION_DATA, Data, Version, ConnectionStates).
uncompress(?NULL, Data, CS) ->
@@ -447,9 +452,10 @@ decipher_aead(Version, CipherFragment,
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
-empty_connection_state(ConnectionEnd) ->
+empty_connection_state(ConnectionEnd, BeastMitigation) ->
SecParams = empty_security_params(ConnectionEnd),
- #connection_state{security_parameters = SecParams}.
+ #connection_state{security_parameters = SecParams,
+ beast_mitigation = BeastMitigation}.
empty_security_params(ConnectionEnd = ?CLIENT) ->
#security_parameters{connection_end = ConnectionEnd,
@@ -478,10 +484,11 @@ record_protocol_role(client) ->
record_protocol_role(server) ->
?SERVER.
-initial_connection_state(ConnectionEnd) ->
+initial_connection_state(ConnectionEnd, BeastMitigation) ->
#connection_state{security_parameters =
initial_security_params(ConnectionEnd),
- sequence_number = 0
+ sequence_number = 0,
+ beast_mitigation = BeastMitigation
}.
initial_security_params(ConnectionEnd) ->
@@ -506,11 +513,17 @@ encode_iolist(Type, Data, Version, ConnectionStates0) ->
%% 1/n-1 splitting countermeasure Rizzo/Duong-Beast, RC4 chiphers are
%% not vulnerable to this attack.
-split_bin(<<FirstByte:8, Rest/binary>>, ChunkSize, Version, BCA) when
+split_bin(<<FirstByte:8, Rest/binary>>, ChunkSize, Version, BCA, one_n_minus_one) when
BCA =/= ?RC4 andalso ({3, 1} == Version orelse
{3, 0} == Version) ->
do_split_bin(Rest, ChunkSize, [[FirstByte]]);
-split_bin(Bin, ChunkSize, _, _) ->
+%% 0/n splitting countermeasure for clients that are incompatible with 1/n-1
+%% splitting.
+split_bin(Bin, ChunkSize, Version, BCA, zero_n) when
+ BCA =/= ?RC4 andalso ({3, 1} == Version orelse
+ {3, 0} == Version) ->
+ do_split_bin(Bin, ChunkSize, [[<<>>]]);
+split_bin(Bin, ChunkSize, _, _, _) ->
do_split_bin(Bin, ChunkSize, []).
do_split_bin(<<>>, _, Acc) ->
diff --git a/lib/ssl/src/ssl_record.hrl b/lib/ssl/src/ssl_record.hrl
index d34d144343..87fde35258 100644
--- a/lib/ssl/src/ssl_record.hrl
+++ b/lib/ssl/src/ssl_record.hrl
@@ -40,7 +40,9 @@
%% RFC 5746
secure_renegotiation,
client_verify_data,
- server_verify_data
+ server_verify_data,
+ %% How to do BEAST mitigation?
+ beast_mitigation
}).
-record(connection_states, {
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl
index 40f3eea527..91903b4a1f 100644
--- a/lib/ssl/src/tls_connection.erl
+++ b/lib/ssl/src/tls_connection.erl
@@ -496,7 +496,8 @@ decode_alerts(Bin) ->
initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions, Tracker}, User,
{CbModule, DataTag, CloseTag, ErrorTag}) ->
- ConnectionStates = ssl_record:init_connection_states(Role),
+ #ssl_options{beast_mitigation = BeastMitigation} = SSLOptions,
+ ConnectionStates = ssl_record:init_connection_states(Role, BeastMitigation),
SessionCacheCb = case application:get_env(ssl, session_cb) of
{ok, Cb} when is_atom(Cb) ->
diff --git a/lib/ssl/test/ssl_basic_SUITE.erl b/lib/ssl/test/ssl_basic_SUITE.erl
index d1162ab4a5..cd06b97ab2 100644
--- a/lib/ssl/test/ssl_basic_SUITE.erl
+++ b/lib/ssl/test/ssl_basic_SUITE.erl
@@ -236,7 +236,10 @@ error_handling_tests_tls()->
rizzo_tests() ->
[rizzo,
- no_rizzo_rc4].
+ no_rizzo_rc4,
+ rizzo_one_n_minus_one,
+ rizzo_zero_n,
+ rizzo_disabled].
%%--------------------------------------------------------------------
init_per_suite(Config0) ->
@@ -346,10 +349,27 @@ init_per_testcase(TestCase, Config) when TestCase == psk_cipher_suites;
ssl_test_lib:ct_log_supported_protocol_versions(Config),
ct:timetrap({seconds, 30}),
Config;
+
init_per_testcase(rizzo, Config) ->
ssl_test_lib:ct_log_supported_protocol_versions(Config),
ct:timetrap({seconds, 40}),
Config;
+
+init_per_testcase(rizzo_one_n_minus_one, Config) ->
+ ct:log("TLS/SSL version ~p~n ", [tls_record:supported_protocol_versions()]),
+ ct:timetrap({seconds, 40}),
+ rizzo_add_mitigation_option(one_n_minus_one, Config);
+
+init_per_testcase(rizzo_zero_n, Config) ->
+ ct:log("TLS/SSL version ~p~n ", [tls_record:supported_protocol_versions()]),
+ ct:timetrap({seconds, 40}),
+ rizzo_add_mitigation_option(zero_n, Config);
+
+init_per_testcase(rizzo_disabled, Config) ->
+ ct:log("TLS/SSL version ~p~n ", [tls_record:supported_protocol_versions()]),
+ ct:timetrap({seconds, 40}),
+ rizzo_add_mitigation_option(disabled, Config);
+
init_per_testcase(prf, Config) ->
ct:log("TLS/SSL version ~p~n ", [tls_record:supported_protocol_versions()]),
ct:timetrap({seconds, 40}),
@@ -3488,6 +3508,36 @@ no_rizzo_rc4(Config) when is_list(Config) ->
run_send_recv_rizzo(Ciphers, Config, Version,
{?MODULE, send_recv_result_active_no_rizzo, []}).
+rizzo_one_n_minus_one() ->
+ [{doc,"Test that the 1/n-1-split mitigation of Rizzo/Dungon attack can be explicitly selected"}].
+
+rizzo_one_n_minus_one(Config) when is_list(Config) ->
+ Ciphers = [X || X ={_,Y,_} <- ssl:cipher_suites(), Y =/= rc4_128],
+ Prop = proplists:get_value(tc_group_properties, Config),
+ Version = proplists:get_value(name, Prop),
+ run_send_recv_rizzo(Ciphers, Config, Version,
+ {?MODULE, send_recv_result_active_rizzo, []}).
+
+rizzo_zero_n() ->
+ [{doc,"Test that the 0/n-split mitigation of Rizzo/Dungon attack can be explicitly selected"}].
+
+rizzo_zero_n(Config) when is_list(Config) ->
+ Ciphers = [X || X ={_,Y,_} <- ssl:cipher_suites(), Y =/= rc4_128],
+ Prop = proplists:get_value(tc_group_properties, Config),
+ Version = proplists:get_value(name, Prop),
+ run_send_recv_rizzo(Ciphers, Config, Version,
+ {?MODULE, send_recv_result_active_no_rizzo, []}).
+
+rizzo_disabled() ->
+ [{doc,"Test that the mitigation of Rizzo/Dungon attack can be explicitly disabled"}].
+
+rizzo_disabled(Config) when is_list(Config) ->
+ Ciphers = [X || X ={_,Y,_} <- ssl:cipher_suites(), Y =/= rc4_128],
+ Prop = proplists:get_value(tc_group_properties, Config),
+ Version = proplists:get_value(name, Prop),
+ run_send_recv_rizzo(Ciphers, Config, Version,
+ {?MODULE, send_recv_result_active_no_rizzo, []}).
+
%%--------------------------------------------------------------------
new_server_wants_peer_cert() ->
[{doc, "Test that server configured to do client certification does"
@@ -3960,6 +4010,18 @@ renegotiate_rejected(Socket) ->
ssl:send(Socket, "Hello world"),
ok.
+rizzo_add_mitigation_option(Value, Config) ->
+ lists:foldl(fun(Opt, Acc) ->
+ case proplists:get_value(Opt, Acc) of
+ undefined -> Acc;
+ C ->
+ N = lists:keystore(beast_mitigation, 1, C,
+ {beast_mitigation, Value}),
+ lists:keystore(Opt, 1, Acc, {Opt, N})
+ end
+ end, Config,
+ [client_opts, client_dsa_opts, server_opts, server_dsa_opts,
+ server_ecdsa_opts, server_ecdh_rsa_opts]).
new_config(PrivDir, ServerOpts0) ->
CaCertFile = proplists:get_value(cacertfile, ServerOpts0),
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 02:04:00 +0000