Merge branch 'fix_unknown_ssl_extension_parsing' into dev

* fix_unknown_ssl_extension_parsing:
  Both the SSLv3 and TLS 1.0/TLS 1.1 specifications require implementations to ignore data following the ClientHello (i.e., extensions) if they do not understand them.
  fix unknown ssl extension parsing by changing length from bits to bytes

3 files changed, 77 insertions, 4 deletions

diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
index 453ea20f99..f873a6a913 100644
--- a/lib/ssl/src/ssl_handshake.erl
+++ b/lib/ssl/src/ssl_handshake.erl
@@ -39,6 +39,8 @@
 	 encode_handshake/2, init_hashes/0, update_hashes/2,
 	 decrypt_premaster_secret/2]).
 
+-export([dec_hello_extensions/2]).
+
 -type tls_handshake() :: #client_hello{} | #server_hello{} |
 			 #server_hello_done{} | #certificate{} | #certificate_request{} |
 			 #client_key_exchange{} | #finished{} | #certificate_verify{} |
@@ -912,9 +914,12 @@ dec_hello_extensions(<<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info:Len/binar
 		      end,	    
     dec_hello_extensions(Rest, [{renegotiation_info, 
 			   #renegotiation_info{renegotiated_connection = RenegotiateInfo}} | Acc]);
-dec_hello_extensions(<<?UINT16(_), ?UINT16(Len), _Unknown:Len, Rest/binary>>, Acc) ->
+
+%% Ignore data following the ClientHello (i.e.,
+%% extensions) if not understood.
+dec_hello_extensions(<<?UINT16(_), ?UINT16(Len), _Unknown:Len/binary, Rest/binary>>, Acc) ->
     dec_hello_extensions(Rest, Acc);
-%% Need this clause?
+%% This theoretically should not happen if the protocol is followed, but if it does it is ignored.
 dec_hello_extensions(_, Acc) ->
     Acc.
 
diff --git a/lib/ssl/test/Makefile b/lib/ssl/test/Makefile
index 5be07cad2c..922abea41b 100644
--- a/lib/ssl/test/Makefile
+++ b/lib/ssl/test/Makefile
@@ -35,8 +35,9 @@ VSN=$(GS_VSN)
 # ----------------------------------------------------
 
 MODULES = \
-        ssl_test_lib \
+	ssl_test_lib \
 	ssl_basic_SUITE \
+	ssl_handshake_SUITE \
 	ssl_packet_SUITE \
 	ssl_payload_SUITE \
 	ssl_to_openssl_SUITE \
@@ -45,7 +46,7 @@ MODULES = \
 	old_ssl_active_SUITE \
 	old_ssl_active_once_SUITE \
 	old_ssl_passive_SUITE \
-        old_ssl_verify_SUITE \
+	old_ssl_verify_SUITE \
 	old_ssl_peer_cert_SUITE \
 	old_ssl_misc_SUITE \
 	old_ssl_protocol_SUITE \
diff --git a/lib/ssl/test/ssl_handshake_SUITE.erl b/lib/ssl/test/ssl_handshake_SUITE.erl
new file mode 100644
index 0000000000..08c23b2d47
--- /dev/null
+++ b/lib/ssl/test/ssl_handshake_SUITE.erl
@@ -0,0 +1,67 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2008-2011. 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/.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+
+-module(ssl_handshake_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include("ssl_internal.hrl").
+-include("ssl_handshake.hrl").
+
+suite() -> [{ct_hooks,[ts_install_cth]}].
+
+all() -> [
+	decode_hello_handshake,
+	decode_single_hello_extension_correctly,
+	decode_unknown_hello_extension_correctly].
+
+decode_hello_handshake(_Config) ->
+	HelloPacket = <<16#02, 16#00, 16#00,
+	16#44, 16#03, 16#03, 16#4e, 16#7f, 16#c1, 16#03, 16#35,
+	16#c2, 16#07, 16#b9, 16#4a, 16#58, 16#af, 16#34, 16#07,
+	16#a6, 16#7e, 16#ef, 16#52, 16#cb, 16#e0, 16#ea, 16#b7,
+	16#aa, 16#47, 16#c8, 16#c2, 16#2c, 16#66, 16#fa, 16#f8,
+	16#09, 16#42, 16#cf, 16#00, 16#c0, 16#30, 16#00, 16#00,
+	16#1c, 
+	16#00, 16#0b, 16#00, 16#04, 16#03, 16#00, 16#01, 16#02, % ec_point_formats
+	16#ff, 16#01, 16#00, 16#01, 16#00, %% renegotiate 
+	16#00, 16#23,
+	16#00, 16#00, 16#33, 16#74, 16#00, 16#07, 16#06, 16#73,
+	16#70, 16#64, 16#79, 16#2f, 16#32>>,
+	
+	{Records, _Buffer} = ssl_handshake:get_tls_handshake(HelloPacket, <<>>),
+	
+	{Hello, _Data} = hd(Records),
+	#renegotiation_info{renegotiated_connection = <<0>>} = Hello#server_hello.renegotiation_info.
+	
+decode_single_hello_extension_correctly(_Config) -> 
+	Renegotiation = <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(1), 0>>,
+	Extensions = ssl_handshake:dec_hello_extensions(Renegotiation, []),
+	[{renegotiation_info,#renegotiation_info{renegotiated_connection = <<0>>}}] = Extensions.
+	
+
+decode_unknown_hello_extension_correctly(_Config) ->
+	FourByteUnknown = <<16#CA,16#FE, ?UINT16(4), 3, 0, 1, 2>>,
+	Renegotiation = <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(1), 0>>,
+	Extensions = ssl_handshake:dec_hello_extensions(<<FourByteUnknown/binary, Renegotiation/binary>>, []),
+	[{renegotiation_info,#renegotiation_info{renegotiated_connection = <<0>>}}] = Extensions.
+