ssl: Support for SSL Next Protocol Negotiation

* http://technotes.googlecode.com/git/nextprotoneg.html

5 files changed, 347 insertions, 80 deletions

diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 40d933a256..9ed6acd43a 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -31,7 +31,8 @@
 	 controlling_process/2, listen/2, pid/1, peername/1, peercert/1,
 	 recv/2, recv/3, send/2, getopts/2, setopts/2, sockname/1,
 	 versions/0, session_info/1, format_error/1,
-	 renegotiate/1, prf/5, clear_pem_cache/0, random_bytes/1]).
+	 renegotiate/1, prf/5, clear_pem_cache/0, random_bytes/1, negotiated_next_protocol/1]).
+
 
 -deprecated({pid, 1, next_major_release}).
 
@@ -65,7 +66,9 @@
                         {keyfile, path()} | {password, string()} | {cacerts, [Der::binary()]} |
                         {cacertfile, path()} | {dh, Der::binary()} | {dhfile, path()} |
                         {ciphers, ciphers()} | {ssl_imp, ssl_imp()} | {reuse_sessions, boolean()} |
-                        {reuse_session, fun()} | {hibernate_after, integer()|undefined}.
+                        {reuse_session, fun()} | {hibernate_after, integer()|undefined} |
+                        {next_protocols_advertised, list(binary())} |
+                        {client_preferred_next_protocols, binary(), client | server, list(binary())}.
 
 -type verify_type()  :: verify_none | verify_peer.
 -type path()         :: string().
@@ -314,6 +317,14 @@ suite_definition(S) ->
     {KeyExchange, Cipher, Hash}.
 
 %%--------------------------------------------------------------------
+-spec negotiated_next_protocol(#sslsocket{}) -> {ok, binary()} | {error, reason()}.
+%%
+%% Description: Returns the next protocol that has been negotiated. If no
+%% protocol has been negotiated will return {error, next_protocol_not_negotiated}
+%%--------------------------------------------------------------------
+negotiated_next_protocol(#sslsocket{fd = new_ssl, pid = Pid}) ->
+    ssl_connection:negotiated_next_protocol(Pid).
+
 -spec cipher_suites() -> [erl_cipher_suite()].
 -spec cipher_suites(erlang | openssl) -> [erl_cipher_suite()] | [string()].
 			   
@@ -594,7 +605,9 @@ handle_options(Opts0, _Role) ->
       renegotiate_at = handle_option(renegotiate_at, Opts, ?DEFAULT_RENEGOTIATE_AT),
       debug      = handle_option(debug, Opts, []),
       hibernate_after = handle_option(hibernate_after, Opts, undefined),
-      erl_dist = handle_option(erl_dist, Opts, false)
+      erl_dist = handle_option(erl_dist, Opts, false),
+      next_protocols_advertised = handle_option(next_protocols_advertised, Opts, undefined),
+      next_protocol_selector = make_next_protocol_selector(handle_option(client_preferred_next_protocols, Opts, undefined))
      },
 
     CbInfo  = proplists:get_value(cb_info, Opts, {gen_tcp, tcp, tcp_closed, tcp_error}),    
@@ -603,7 +616,8 @@ handle_options(Opts0, _Role) ->
 		  depth, cert, certfile, key, keyfile,
 		  password, cacerts, cacertfile, dh, dhfile, ciphers,
 		  debug, reuse_session, reuse_sessions, ssl_imp,
-		  cb_info, renegotiate_at, secure_renegotiate, hibernate_after, erl_dist],
+		  cb_info, renegotiate_at, secure_renegotiate, hibernate_after, erl_dist, next_protocols_advertised,
+		  client_preferred_next_protocols],
     
     SockOpts = lists:foldl(fun(Key, PropList) -> 
 				   proplists:delete(Key, PropList)
@@ -728,12 +742,42 @@ validate_option(hibernate_after, undefined) ->
     undefined;
 validate_option(hibernate_after, Value) when is_integer(Value), Value >= 0 ->
     Value;
-validate_option(erl_dist,Value) when Value == true; 
+validate_option(erl_dist,Value) when Value == true;
 				     Value == false ->
     Value;
+validate_option(client_preferred_next_protocols, {FallbackProtocol, Order, PreferredProtocols} = Value)
+      when is_list(PreferredProtocols), is_binary(FallbackProtocol),
+           byte_size(FallbackProtocol) > 0, byte_size(FallbackProtocol) < 256 ->
+    validate_binary_list(client_preferred_next_protocols, PreferredProtocols),
+    validate_npn_ordering(Order),
+    Value;
+validate_option(client_preferred_next_protocols, undefined) ->
+    undefined;
+validate_option(next_protocols_advertised, Value) when is_list(Value) ->
+    validate_binary_list(next_protocols_advertised, Value),
+    Value;
+validate_option(next_protocols_advertised, undefined) ->
+    undefined;
 validate_option(Opt, Value) ->
     throw({error, {eoptions, {Opt, Value}}}).
-    
+
+validate_npn_ordering(client) ->
+    ok;
+validate_npn_ordering(server) ->
+    ok;
+validate_npn_ordering(Value) ->
+    throw({error, {eoptions, {client_preferred_next_protocols, Value}}}).
+
+validate_binary_list(Opt, List) ->
+    lists:foreach(
+        fun(Bin) when is_binary(Bin),
+                      byte_size(Bin) > 0,
+                      byte_size(Bin) < 256 ->
+            ok;
+           (Bin) ->
+            throw({error, {eoptions, {Opt, Bin}}})
+        end, List).
+
 validate_versions([], Versions) ->
     Versions;
 validate_versions([Version | Rest], Versions) when Version == 'tlsv1.2';
@@ -839,6 +883,34 @@ cipher_suites(Version, Ciphers0)  ->
 
 no_format(Error) ->    
     lists:flatten(io_lib:format("No format string for error: \"~p\" available.", [Error])).
+
+detect(_Pred, []) ->
+    undefined;
+detect(Pred, [H|T]) ->
+    case Pred(H) of
+        true ->
+            H;
+        _ ->
+            detect(Pred, T)
+    end.
+
+make_next_protocol_selector(undefined) ->
+    undefined;
+make_next_protocol_selector({FallbackProtocol, client, AllProtocols}) ->
+    fun(AdvertisedProtocols) ->
+        case detect(fun(PreferredProtocol) -> lists:member(PreferredProtocol, AdvertisedProtocols) end, AllProtocols) of
+            undefined -> FallbackProtocol;
+            PreferredProtocol -> PreferredProtocol
+        end
+    end;
+
+make_next_protocol_selector({FallbackProtocol, server, AllProtocols}) ->
+    fun(AdvertisedProtocols) ->
+        case detect(fun(PreferredProtocol) -> lists:member(PreferredProtocol, AllProtocols) end, AdvertisedProtocols) of
+            undefined -> FallbackProtocol;
+            PreferredProtocol -> PreferredProtocol
+        end
+    end.
                                 
 %% Only used to remove exit messages from old ssl
 %% First is a nonsense clause to provide some
diff --git a/lib/ssl/src/ssl_connection.erl b/lib/ssl/src/ssl_connection.erl
index ff2556c488..4e3f0bd46d 100644
--- a/lib/ssl/src/ssl_connection.erl
+++ b/lib/ssl/src/ssl_connection.erl
@@ -41,7 +41,7 @@
 	 socket_control/3, close/1, shutdown/2,
 	 new_user/2, get_opts/2, set_opts/2, info/1, session_info/1, 
 	 peer_certificate/1, sockname/1, peername/1, renegotiation/1,
-	 prf/5]).
+	 negotiated_next_protocol/1, prf/5]).
 
 %% Called by ssl_connection_sup
 -export([start_link/7]). 
@@ -92,7 +92,9 @@
 	  start_or_recv_from,  % "gen_fsm From"
 	  send_queue,          % queue()
 	  terminated = false,  %
-	  allow_renegotiate = true
+	  allow_renegotiate = true,
+          expecting_next_protocol_negotiation = false :: boolean(),
+          next_protocol = undefined :: undefined | binary()
 	 }).
 
 -define(DEFAULT_DIFFIE_HELLMAN_PARAMS, 
@@ -221,6 +223,13 @@ new_user(ConnectionPid, User) ->
 sockname(ConnectionPid) ->
     sync_send_all_state_event(ConnectionPid, sockname).
 %%--------------------------------------------------------------------
+-spec negotiated_next_protocol(pid()) -> {ok, binary()} | {error, reason()}.
+%%
+%% Description:  Returns the negotiated protocol
+%%--------------------------------------------------------------------
+negotiated_next_protocol(ConnectionPid) ->
+    sync_send_all_state_event(ConnectionPid, negotiated_next_protocol).
+%%--------------------------------------------------------------------
 -spec peername(pid()) -> {ok, {inet:ip_address(), inet:port_number()}} | {error, reason()}.
 %%
 %% Description:  Same as inet:peername/1
@@ -374,31 +383,41 @@ hello(#server_hello{cipher_suite = CipherSuite,
 	     renegotiation = {Renegotiation, _},
 	     ssl_options = SslOptions} = State0) ->
     case ssl_handshake:hello(Hello, SslOptions, ConnectionStates0, Renegotiation) of
-	{Version, NewId, ConnectionStates} ->
+        #alert{} = Alert ->
+            handle_own_alert(Alert, ReqVersion, hello, State0),
+            {stop, normal, State0};
+
+	{Version, NewId, ConnectionStates, NextProtocol} ->
 	    {KeyAlgorithm, _, _, _} =
 		ssl_cipher:suite_definition(CipherSuite),
-	    
+
 	    PremasterSecret = make_premaster_secret(ReqVersion, KeyAlgorithm),
-	    
+
+		NewNextProtocol = case NextProtocol of
+			undefined ->
+				State0#state.next_protocol;
+			_ ->
+				NextProtocol
+		end,
+
 	    State = State0#state{key_algorithm = KeyAlgorithm,
 				 hashsign_algorithm = default_hashsign(Version, KeyAlgorithm),
 				 negotiated_version = Version,
 				 connection_states = ConnectionStates,
-				 premaster_secret = PremasterSecret},
-	    
+				 premaster_secret = PremasterSecret,
+				 expecting_next_protocol_negotiation = NextProtocol =/= undefined,
+				 next_protocol = NewNextProtocol},
+
 	    case ssl_session:is_new(OldId, NewId) of
 		true ->
 		    handle_new_session(NewId, CipherSuite, Compression,
 				       State#state{connection_states = ConnectionStates});
 		false ->
-		    handle_resumed_session(NewId, State#state{connection_states = ConnectionStates}) 
-	    end;
-	#alert{} = Alert ->
-	    handle_own_alert(Alert, ReqVersion, hello, State0), 
-            {stop, normal, State0}
+		    handle_resumed_session(NewId, State#state{connection_states = ConnectionStates})
+	    end
     end;
 
-hello(Hello = #client_hello{client_version = ClientVersion}, 
+hello(Hello = #client_hello{client_version = ClientVersion},
       State = #state{connection_states = ConnectionStates0,
 		     port = Port, session = #session{own_certificate = Cert} = Session0,
 		     renegotiation = {Renegotiation, _},
@@ -407,8 +426,8 @@ hello(Hello = #client_hello{client_version = ClientVersion},
 		     ssl_options = SslOpts}) ->
     case ssl_handshake:hello(Hello, SslOpts, {Port, Session0, Cache, CacheCb,
 				     ConnectionStates0, Cert}, Renegotiation) of
-        {Version, {Type, Session}, ConnectionStates} ->       
-            do_server_hello(Type, State#state{connection_states  = 
+        {Version, {Type, Session}, ConnectionStates, ProtocolsToAdvertise} ->
+            do_server_hello(Type, ProtocolsToAdvertise, State#state{connection_states  =
 					      ConnectionStates,
 					      negotiated_version = Version,
 					      session = Session});
@@ -593,6 +612,7 @@ certify(#client_key_exchange{exchange_keys = Keys},
 	    {stop, normal, State}
     end;
 
+
 certify(timeout, State) ->
     { next_state, certify, State, hibernate };
 
@@ -662,6 +682,12 @@ cipher(#certificate_verify{signature = Signature, hashsign_algorithm = CertHashS
 	    {stop, normal, State0}
     end;
 
+% client must send a next protocol message if we are expecting it
+cipher(#finished{}, #state{role = server, expecting_next_protocol_negotiation = true,
+			   next_protocol = undefined, negotiated_version = Version} = State0) ->
+       handle_own_alert(?ALERT_REC(?FATAL,?UNEXPECTED_MESSAGE), Version, cipher, State0),
+       {stop, normal, State0};
+
 cipher(#finished{verify_data = Data} = Finished, 
        #state{negotiated_version = Version,
 	      host = Host,
@@ -683,6 +709,13 @@ cipher(#finished{verify_data = Data} = Finished,
             {stop, normal, State} 
     end;
 
+% only allowed to send next_protocol message after change cipher spec
+% & before finished message and it is not allowed during renegotiation
+cipher(#next_protocol{selected_protocol = SelectedProtocol},
+       #state{role = server, expecting_next_protocol_negotiation = true} = State0) ->
+    {Record, State} = next_record(State0#state{next_protocol = SelectedProtocol}),
+    next_state(cipher, cipher, Record, State);
+
 cipher(timeout, State) ->
     { next_state, cipher, State, hibernate };
 
@@ -842,6 +875,10 @@ handle_sync_event(sockname, _From, StateName,
     SockNameReply = inet:sockname(Socket),
     {reply, SockNameReply, StateName, State, get_timeout(State)};
 
+handle_sync_event(negotiated_next_protocol, _From, StateName, #state{next_protocol = undefined} = State) ->
+    {reply, {error, next_protocol_not_negotiated}, StateName, State, get_timeout(State)};
+handle_sync_event(negotiated_next_protocol, _From, StateName, #state{next_protocol = NextProtocol} = State) ->
+    {reply, {ok, NextProtocol}, StateName, State, get_timeout(State)};
 handle_sync_event(peername, _From, StateName,
 		  #state{socket = Socket} = State) ->
     PeerNameReply = inet:peername(Socket),
@@ -1274,17 +1311,20 @@ verify_client_cert(#state{client_certificate_requested = true, role = client,
 verify_client_cert(#state{client_certificate_requested = false} = State) ->
     State.
 
-do_server_hello(Type, #state{negotiated_version = Version,
-			     session = #session{session_id = SessId},
-			     connection_states = ConnectionStates0,
-			     renegotiation = {Renegotiation, _}} 
-		= State0) when is_atom(Type) -> 
+
+
+do_server_hello(Type, NextProtocolsToSend, #state{negotiated_version = Version,
+						  session = #session{session_id = SessId},
+						  connection_states = ConnectionStates0,
+						  renegotiation = {Renegotiation, _}}
+		= State0) when is_atom(Type) ->
 
     ServerHello = 
         ssl_handshake:server_hello(SessId, Version, 
-                                   ConnectionStates0, Renegotiation),
-    State = server_hello(ServerHello, State0),
-    
+                                   ConnectionStates0, Renegotiation, NextProtocolsToSend),
+    State = server_hello(ServerHello,
+			 State0#state{expecting_next_protocol_negotiation =
+					  NextProtocolsToSend =/= undefined}),
     case Type of	
 	new ->
 	    new_server_hello(ServerHello, State);
@@ -1538,12 +1578,34 @@ request_client_cert(#state{ssl_options = #ssl_options{verify = verify_none}} =
     State.
 
 finalize_handshake(State, StateName) ->
-    ConnectionStates0 = cipher_protocol(State),    
+    ConnectionStates0 = cipher_protocol(State),
+
     ConnectionStates =
         ssl_record:activate_pending_connection_state(ConnectionStates0,
                                                      write),
-    finished(State#state{connection_states = ConnectionStates}, StateName).
-    
+
+    State1 = State#state{connection_states = ConnectionStates},
+    State2 = next_protocol(State1),
+    finished(State2, StateName).
+
+
+next_protocol(#state{role = server} = State) ->
+    State;
+next_protocol(#state{next_protocol = undefined} = State) ->
+    State;
+next_protocol(#state{expecting_next_protocol_negotiation = false} = State) ->
+    State;
+next_protocol(#state{transport_cb = Transport, socket = Socket,
+		     negotiated_version = Version,
+		     next_protocol = NextProtocol,
+		     connection_states = ConnectionStates0,
+		     tls_handshake_history = Handshake0} = State) ->
+    NextProtocolMessage = ssl_handshake:next_protocol(NextProtocol),
+    {BinMsg, ConnectionStates, Handshake} = encode_handshake(NextProtocolMessage, Version, ConnectionStates0, Handshake0),
+    Transport:send(Socket, BinMsg),
+    State#state{connection_states = ConnectionStates,
+                tls_handshake_history = Handshake}.
+
 cipher_protocol(#state{connection_states = ConnectionStates0,
                        socket = Socket,
                        negotiated_version = Version,
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
index bb26302fff..3b114c1f9c 100644
--- a/lib/ssl/src/ssl_handshake.erl
+++ b/lib/ssl/src/ssl_handshake.erl
@@ -30,14 +30,14 @@
 -include("ssl_internal.hrl").
 -include_lib("public_key/include/public_key.hrl").
 
--export([master_secret/4, client_hello/8, server_hello/4, hello/4,
+-export([master_secret/4, client_hello/8, server_hello/5, hello/4,
 	 hello_request/0, certify/7, certificate/4,
 	 client_certificate_verify/6, certificate_verify/6,
 	 certificate_request/3, key_exchange/3, server_key_exchange_hash/2,
 	 finished/5, verify_connection/6, get_tls_handshake/3,
 	 decode_client_key/3, server_hello_done/0,
 	 encode_handshake/2, init_handshake_history/0, update_handshake_history/2,
-	 decrypt_premaster_secret/2, prf/5]).
+	 decrypt_premaster_secret/2, prf/5, next_protocol/1]).
 
 -export([dec_hello_extensions/2]).
 
@@ -46,6 +46,13 @@
 			 #client_key_exchange{} | #finished{} | #certificate_verify{} |
 			 #hello_request{}.
 
+encode_client_protocol_negotiation(undefined, _) ->
+       undefined;
+encode_client_protocol_negotiation(_, false) ->
+	#next_protocol_negotiation{extension_data = <<>>};
+encode_client_protocol_negotiation(_, _) ->
+	undefined.
+
 %%====================================================================
 %% Internal application API
 %%====================================================================
@@ -77,18 +84,31 @@ client_hello(Host, Port, ConnectionStates,
 		  cipher_suites = cipher_suites(Ciphers, Renegotiation),
 		  compression_methods = ssl_record:compressions(),
 		  random = SecParams#security_parameters.client_random,
+
 		  renegotiation_info =
 		      renegotiation_info(client, ConnectionStates, Renegotiation),
-		  hash_signs = default_hash_signs()
+		  hash_signs = default_hash_signs(),
+		  next_protocol_negotiation =
+		      encode_client_protocol_negotiation(SslOpts#ssl_options.next_protocol_selector, Renegotiation)
 		 }.
 
+encode_protocol(Protocol, Acc) ->
+	Len = byte_size(Protocol),
+	<<Acc/binary, ?BYTE(Len), Protocol/binary>>.
+
+encode_protocols_advertised_on_server(undefined) ->
+	undefined;
+
+encode_protocols_advertised_on_server(Protocols) ->
+	#next_protocol_negotiation{extension_data = lists:foldl(fun encode_protocol/2, <<>>, Protocols)}.
+
 %%--------------------------------------------------------------------
 -spec server_hello(session_id(), tls_version(), #connection_states{}, 
-		   boolean()) -> #server_hello{}.
+		   boolean(), list(string())) -> #server_hello{}.
 %%
 %% Description: Creates a server hello message.
 %%--------------------------------------------------------------------
-server_hello(SessionId, Version, ConnectionStates, Renegotiation) ->
+server_hello(SessionId, Version, ConnectionStates, Renegotiation, ProtocolsAdvertisedOnServer) ->
     Pending = ssl_record:pending_connection_state(ConnectionStates, read),
     SecParams = Pending#connection_state.security_parameters,
     #server_hello{server_version = Version,
@@ -98,7 +118,8 @@ server_hello(SessionId, Version, ConnectionStates, Renegotiation) ->
 		  random = SecParams#security_parameters.server_random,
 		  session_id = SessionId,
 		  renegotiation_info = 
-		  renegotiation_info(server, ConnectionStates, Renegotiation)
+		  renegotiation_info(server, ConnectionStates, Renegotiation),
+		  next_protocol_negotiation = encode_protocols_advertised_on_server(ProtocolsAdvertisedOnServer)
 		 }.
 
 %%--------------------------------------------------------------------
@@ -113,20 +134,21 @@ hello_request() ->
 %%--------------------------------------------------------------------
 -spec hello(#server_hello{} | #client_hello{}, #ssl_options{},
 	    #connection_states{} | {inet:port_number(), #session{}, db_handle(),
- 				    atom(), #connection_states{}, binary()},
- 	    boolean()) -> {tls_version(), session_id(), #connection_states{}}| 
- 			  {tls_version(), {resumed | new, #session{}}, 
- 			   #connection_states{}} | #alert{}.
+				    atom(), #connection_states{}, binary()},
+	    boolean()) ->
+			  {tls_version(), session_id(), #connection_states{}, binary() | undefined}|
+			  {tls_version(), {resumed | new, #session{}}, #connection_states{}, list(binary()) | undefined} |
+			  #alert{}.
 %%
 %% Description: Handles a recieved hello message
 %%--------------------------------------------------------------------
 hello(#server_hello{cipher_suite = CipherSuite, server_version = Version,
 		    compression_method = Compression, random = Random,
 		    session_id = SessionId, renegotiation_info = Info,
-		    hash_signs = _HashSigns},
-      #ssl_options{secure_renegotiate = SecureRenegotation},
+		    hash_signs = _HashSigns} = Hello,
+      #ssl_options{secure_renegotiate = SecureRenegotation, next_protocol_selector = NextProtocolSelector},
       ConnectionStates0, Renegotiation) ->
-%%TODO: select hash and signature algorigthm
+    %%TODO: select hash and signature algorigthm
     case ssl_record:is_acceptable_version(Version) of
 	true ->
 	    case handle_renegotiation_info(client, Info, ConnectionStates0, 
@@ -135,7 +157,12 @@ hello(#server_hello{cipher_suite = CipherSuite, server_version = Version,
 		    ConnectionStates =
 			hello_pending_connection_states(client, Version, CipherSuite, Random,
 							Compression, ConnectionStates1),
-		    {Version, SessionId, ConnectionStates};
+		    case handle_next_protocol(Hello, NextProtocolSelector, Renegotiation) of
+			#alert{} = Alert ->
+			    Alert;
+			    Protocol ->
+			    {Version, SessionId, ConnectionStates, Protocol}
+		    end;
 		#alert{} = Alert ->
 		    Alert
 	    end;
@@ -145,9 +172,8 @@ hello(#server_hello{cipher_suite = CipherSuite, server_version = Version,
 			       
 hello(#client_hello{client_version = ClientVersion, random = Random,
 		    cipher_suites = CipherSuites,
-		    renegotiation_info = Info,
-		    hash_signs = _HashSigns} = Hello,
-      #ssl_options{versions = Versions, 
+		    renegotiation_info = Info} = Hello,
+      #ssl_options{versions = Versions,
 		   secure_renegotiate = SecureRenegotation} = SslOpts,
       {Port, Session0, Cache, CacheCb, ConnectionStates0, Cert}, Renegotiation) ->
 %% TODO: select hash and signature algorithm
@@ -173,7 +199,12 @@ hello(#client_hello{client_version = ClientVersion, random = Random,
 								Random, 
 								Compression,
 								ConnectionStates1),
-			    {Version, {Type, Session}, ConnectionStates};
+				case handle_next_protocol_on_server(Hello, Renegotiation, SslOpts) of
+					#alert{} = Alert ->
+						Alert;
+					ProtocolsToAdvertise ->
+						{Version, {Type, Session}, ConnectionStates, ProtocolsToAdvertise}
+			    end;
 			#alert{} = Alert ->
 			    Alert
 		    end
@@ -427,6 +458,11 @@ master_secret(Version, PremasterSecret, ConnectionStates, Role) ->
 	    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)
     end.
 
+-spec next_protocol(binary()) -> #next_protocol{}.
+
+next_protocol(SelectedProtocol) ->
+  #next_protocol{selected_protocol = SelectedProtocol}.
+
 %%--------------------------------------------------------------------
 -spec finished(tls_version(), client | server, integer(), binary(), tls_handshake_history()) ->
     #finished{}.
@@ -660,6 +696,57 @@ renegotiation_info(server, ConnectionStates, true) ->
 	    #renegotiation_info{renegotiated_connection = undefined}
     end. 
 
+decode_next_protocols({next_protocol_negotiation, Protocols}) ->
+    decode_next_protocols(Protocols, []).
+decode_next_protocols(<<>>, Acc) ->
+    lists:reverse(Acc);
+decode_next_protocols(<<?BYTE(Len), Protocol:Len/binary, Rest/binary>>, Acc) ->
+    case Len of
+        0 ->
+            {error, invalid_next_protocols};
+        _ ->
+            decode_next_protocols(Rest, [Protocol|Acc])
+    end;
+decode_next_protocols(_Bytes, _Acc) ->
+    {error, invalid_next_protocols}.
+
+next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) ->
+    NextProtocolSelector =/= undefined andalso not Renegotiating.
+
+handle_next_protocol_on_server(#client_hello{next_protocol_negotiation = undefined}, _Renegotiation, _SslOpts) ->
+    undefined;
+
+handle_next_protocol_on_server(#client_hello{next_protocol_negotiation = {next_protocol_negotiation,<<>>}},
+			       false, #ssl_options{next_protocols_advertised = Protocols}) ->
+    Protocols;
+
+handle_next_protocol_on_server(_Hello, _Renegotiation, _SSLOpts) ->
+    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE). % unexpected next protocol extension
+
+handle_next_protocol(#server_hello{next_protocol_negotiation = undefined},
+    _NextProtocolSelector, _Renegotiating) ->
+    undefined;
+
+handle_next_protocol(#server_hello{next_protocol_negotiation = Protocols},
+    NextProtocolSelector, Renegotiating) ->
+
+    case next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) of
+        true ->
+            select_next_protocol(decode_next_protocols(Protocols), NextProtocolSelector);
+        false ->
+            ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) % unexpected next protocol extension
+    end.
+
+select_next_protocol({error, _Reason}, _NextProtocolSelector) ->
+    ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE);
+select_next_protocol(Protocols, NextProtocolSelector) ->
+    case NextProtocolSelector(Protocols) of
+      Protocol when is_binary(Protocol), byte_size(Protocol) > 0 ->
+          Protocol;
+      _ ->
+          ?ALERT_REC(?FATAL, ?INTERNAL_ERROR) % we are broken internally :( api presently stops this but we might let it happen in future
+    end.
+
 handle_renegotiation_info(_, #renegotiation_info{renegotiated_connection = ?byte(0)}, 
 			  ConnectionStates, false, _, _) ->
     {ok, ssl_record:set_renegotiation_flag(true, ConnectionStates)};
@@ -816,17 +903,21 @@ master_secret(Version, MasterSecret, #security_parameters{
 					 ServerCipherState, Role)}.
 
 
-dec_hs(_Version, ?HELLO_REQUEST, <<>>) ->
+dec_hs(_, ?NEXT_PROTOCOL, <<?BYTE(SelectedProtocolLength), SelectedProtocol:SelectedProtocolLength/binary,
+                         ?BYTE(PaddingLength), _Padding:PaddingLength/binary>>) ->
+	#next_protocol{selected_protocol = SelectedProtocol};
+
+dec_hs(_, ?HELLO_REQUEST, <<>>) ->
     #hello_request{};
 
 %% Client hello v2.
 %% The server must be able to receive such messages, from clients that
 %% are willing to use ssl v3 or higher, but have ssl v2 compatibility.
 dec_hs(_Version, ?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor),
-		       ?UINT16(CSLength), ?UINT16(0),
-		       ?UINT16(CDLength), 
-		       CipherSuites:CSLength/binary, 
-		       ChallengeData:CDLength/binary>>) ->
+				  ?UINT16(CSLength), ?UINT16(0),
+				  ?UINT16(CDLength),
+				  CipherSuites:CSLength/binary,
+				  ChallengeData:CDLength/binary>>) ->
     #client_hello{client_version = {Major, Minor},
 		  random = ssl_ssl2:client_random(ChallengeData, CDLength),
 		  session_id = 0,
@@ -839,20 +930,22 @@ dec_hs(_Version, ?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 		       ?UINT16(Cs_length), CipherSuites:Cs_length/binary,
 		       ?BYTE(Cm_length), Comp_methods:Cm_length/binary,
 		       Extensions/binary>>) ->
-    HelloExtensions = dec_hello_extensions(Extensions),
-    RenegotiationInfo = proplists:get_value(renegotiation_info, HelloExtensions,
-					   undefined),
-    HashSigns = proplists:get_value(hash_signs, HelloExtensions,
-					   undefined),
+
+    DecodedExtensions = dec_hello_extensions(Extensions),
+    RenegotiationInfo = proplists:get_value(renegotiation_info, DecodedExtensions, undefined),
+    HashSigns = proplists:get_value(hash_signs, DecodedExtensions, undefined),
+    NextProtocolNegotiation = proplists:get_value(next_protocol_negotiation, DecodedExtensions, undefined),
+
     #client_hello{
-	client_version = {Major,Minor},
-	random = Random,
-	session_id = Session_ID,
-	cipher_suites = from_2bytes(CipherSuites),
-	compression_methods = Comp_methods,
-	renegotiation_info = RenegotiationInfo,
-	hash_signs = HashSigns
-       };
+       client_version = {Major,Minor},
+       random = Random,
+       session_id = Session_ID,
+       cipher_suites = from_2bytes(CipherSuites),
+       compression_methods = Comp_methods,
+       renegotiation_info = RenegotiationInfo,
+       hash_signs = HashSigns,
+       next_protocol_negotiation = NextProtocolNegotiation
+      };
 
 dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 		       ?BYTE(SID_length), Session_ID:SID_length/binary,
@@ -868,7 +961,7 @@ dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 
 dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 		       ?BYTE(SID_length), Session_ID:SID_length/binary,
-		       Cipher_suite:2/binary, ?BYTE(Comp_method), 
+		       Cipher_suite:2/binary, ?BYTE(Comp_method),
 		       ?UINT16(ExtLen), Extensions:ExtLen/binary>>) ->
     
     HelloExtensions = dec_hello_extensions(Extensions, []),
@@ -876,6 +969,8 @@ dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 					   undefined),
     HashSigns = proplists:get_value(hash_signs, HelloExtensions,
 					   undefined),
+    NextProtocolNegotiation = proplists:get_value(next_protocol_negotiation, HelloExtensions, undefined),
+
     #server_hello{
 	server_version = {Major,Minor},
 	random = Random,
@@ -883,7 +978,8 @@ dec_hs(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 	cipher_suite = Cipher_suite,
 	compression_method = Comp_method,
 	renegotiation_info = RenegotiationInfo,
-	hash_signs = HashSigns};
+	hash_signs = HashSigns,
+       next_protocol_negotiation = NextProtocolNegotiation};
 dec_hs(_Version, ?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>) ->
     #certificate{asn1_certificates = certs_to_list(ASN1Certs)};
 
@@ -959,6 +1055,9 @@ dec_hello_extensions(_) ->
 
 dec_hello_extensions(<<>>, Acc) ->
     Acc;
+dec_hello_extensions(<<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), ExtensionData:Len/binary, Rest/binary>>, Acc) ->
+    Prop = {next_protocol_negotiation, #next_protocol_negotiation{extension_data = ExtensionData}},
+    dec_hello_extensions(Rest, [Prop | Acc]);
 dec_hello_extensions(<<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info:Len/binary, Rest/binary>>, Acc) ->
     RenegotiateInfo = case Len of
 			  1 ->  % Initial handshake
@@ -982,6 +1081,7 @@ dec_hello_extensions(<<?UINT16(?SIGNATURE_ALGORITHMS_EXT), ?UINT16(Len),
 
 %% 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);
 %% This theoretically should not happen if the protocol is followed, but if it does it is ignored.
@@ -1014,6 +1114,11 @@ certs_from_list(ACList) ->
                         <<?UINT24(CertLen), Cert/binary>>
 		    end || Cert <- ACList]).
 
+enc_hs(#next_protocol{selected_protocol = SelectedProtocol}, _Version) ->
+    PaddingLength = 32 - ((byte_size(SelectedProtocol) + 2) rem 32),
+
+    {?NEXT_PROTOCOL, <<?BYTE((byte_size(SelectedProtocol))), SelectedProtocol/binary,
+                         ?BYTE(PaddingLength), 0:(PaddingLength * 8)>>};
 enc_hs(#hello_request{}, _Version) ->
     {?HELLO_REQUEST, <<>>};
 enc_hs(#client_hello{client_version = {Major, Minor},
@@ -1022,19 +1127,21 @@ enc_hs(#client_hello{client_version = {Major, Minor},
 		     cipher_suites = CipherSuites,
 		     compression_methods = CompMethods, 
 		     renegotiation_info = RenegotiationInfo,
-		     hash_signs = HashSigns}, _Version) ->
+		     hash_signs = HashSigns,
+		     next_protocol_negotiation = NextProtocolNegotiation}, _Version) ->
     SIDLength = byte_size(SessionID),
     BinCompMethods = list_to_binary(CompMethods),
     CmLength = byte_size(BinCompMethods),
     BinCipherSuites = list_to_binary(CipherSuites),
     CsLength = byte_size(BinCipherSuites),
-    Extensions0 = hello_extensions(RenegotiationInfo),
+    Extensions0 = hello_extensions(RenegotiationInfo, NextProtocolNegotiation),
     Extensions1 = if
 		      Major == 3, Minor >=3 -> Extensions0 ++ hello_extensions(HashSigns);
 		      true -> Extensions0
 		  end,
     ExtensionsBin = enc_hello_extensions(Extensions1),
-    {?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
+
+ {?CLIENT_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 		     ?BYTE(SIDLength), SessionID/binary,
 		     ?UINT16(CsLength), BinCipherSuites/binary,
 		     ?BYTE(CmLength), BinCompMethods/binary, ExtensionsBin/binary>>};
@@ -1044,9 +1151,10 @@ enc_hs(#server_hello{server_version = {Major, Minor},
 		     session_id = Session_ID,
 		     cipher_suite = Cipher_suite,
 		     compression_method = Comp_method,
-		     renegotiation_info = RenegotiationInfo}, _Version) ->
+		     renegotiation_info = RenegotiationInfo,
+		     next_protocol_negotiation = NextProtocolNegotiation}, _Version) ->
     SID_length = byte_size(Session_ID),
-    Extensions  = hello_extensions(RenegotiationInfo),
+    Extensions  = hello_extensions(RenegotiationInfo, NextProtocolNegotiation),
     ExtensionsBin = enc_hello_extensions(Extensions),
     {?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary,
 		     ?BYTE(SID_length), Session_ID/binary,
@@ -1119,8 +1227,9 @@ enc_sign(_HashSign, Sign, _Version) ->
 	SignLen = byte_size(Sign),
 	<<?UINT16(SignLen), Sign/binary>>.
 
-hello_extensions(undefined) ->
-    [];
+hello_extensions(RenegotiationInfo, NextProtocolNegotiation) ->
+    hello_extensions(RenegotiationInfo) ++ next_protocol_extension(NextProtocolNegotiation).
+
 %% Renegotiation info
 hello_extensions(#renegotiation_info{renegotiated_connection = undefined}) ->
     [];
@@ -1129,6 +1238,11 @@ hello_extensions(#renegotiation_info{} = Info) ->
 hello_extensions(#hash_sign_algos{} = Info) ->
     [Info].
 
+next_protocol_extension(undefined) ->
+    [];
+next_protocol_extension(#next_protocol_negotiation{} = Info) ->
+    [Info].
+
 enc_hello_extensions(Extensions) ->
     enc_hello_extensions(Extensions, <<>>).
 enc_hello_extensions([], <<>>) ->
@@ -1137,6 +1251,9 @@ enc_hello_extensions([], Acc) ->
     Size = byte_size(Acc),
     <<?UINT16(Size), Acc/binary>>;
 
+enc_hello_extensions([#next_protocol_negotiation{extension_data = ExtensionData} | Rest], Acc) ->
+    Len = byte_size(ExtensionData),
+    enc_hello_extensions(Rest, <<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), ExtensionData/binary, Acc/binary>>);
 enc_hello_extensions([#renegotiation_info{renegotiated_connection = ?byte(0) = Info} | Rest], Acc) ->
     Len = byte_size(Info),
     enc_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info/binary, Acc/binary>>);
diff --git a/lib/ssl/src/ssl_handshake.hrl b/lib/ssl/src/ssl_handshake.hrl
index cc17dc2975..bd583e5d92 100644
--- a/lib/ssl/src/ssl_handshake.hrl
+++ b/lib/ssl/src/ssl_handshake.hrl
@@ -97,7 +97,8 @@
 	  cipher_suites,      % cipher_suites<2..2^16-1>
 	  compression_methods, % compression_methods<1..2^8-1>,
 	  renegotiation_info,
-	  hash_signs          % supported combinations of hashes/signature algos
+	  hash_signs,          % supported combinations of hashes/signature algos
+	  next_protocol_negotiation = undefined :: undefined | list(binary())
 	 }).
 
 -record(server_hello, {
@@ -107,7 +108,8 @@
 	  cipher_suite,       % cipher_suites
 	  compression_method, % compression_method
 	  renegotiation_info,
-	  hash_signs          % supported combinations of hashes/signature algos
+	  hash_signs,          % supported combinations of hashes/signature algos
+	  next_protocol_negotiation = undefined :: undefined | list(binary())
 	 }).
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -234,6 +236,18 @@
 	  hash_sign_algos
 	 }).
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Next Protocol Negotiation
+%% (http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-02)
+%% (http://technotes.googlecode.com/git/nextprotoneg.html)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-define(NEXTPROTONEG_EXT, 13172).
+-define(NEXT_PROTOCOL, 67).
+-record(next_protocol_negotiation, {extension_data}).
+
+-record(next_protocol, {selected_protocol}).
+
 -endif. % -ifdef(ssl_handshake).
 
 
diff --git a/lib/ssl/src/ssl_internal.hrl b/lib/ssl/src/ssl_internal.hrl
index b8f2ae3b51..643b3fbf7d 100644
--- a/lib/ssl/src/ssl_internal.hrl
+++ b/lib/ssl/src/ssl_internal.hrl
@@ -106,7 +106,9 @@
 			  % after which ssl_connection will
                           % go into hibernation
 	  %% This option should only be set to true by inet_tls_dist
-	  erl_dist = false 
+	  erl_dist = false,
+	  next_protocols_advertised = undefined :: list(binary()),
+	  next_protocol_selector = undefined :: fun((list(binary())) -> binary())
 	  }).
 
 -record(socket_options,