Merge branch 'ia/ssh/version-handling-gracefull/OTP-12157' into maint-17

* ia/ssh/version-handling-gracefull/OTP-12157:
  ssh: Add format_status/2 so sensitive data will not be present in logs
  ssh: Gracefully handle incorrect versions

3 files changed, 70 insertions, 22 deletions

diff --git a/lib/ssh/src/ssh_connect.hrl b/lib/ssh/src/ssh_connect.hrl
index 8421b07167..9307dbbad0 100644
--- a/lib/ssh/src/ssh_connect.hrl
+++ b/lib/ssh/src/ssh_connect.hrl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2005-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2005-2014. 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
@@ -26,6 +26,7 @@
 -define(DEFAULT_PACKET_SIZE, 32768).
 -define(DEFAULT_WINDOW_SIZE, 2*?DEFAULT_PACKET_SIZE).
 -define(DEFAULT_TIMEOUT, 5000).
+-define(MAX_PROTO_VERSION, 255).
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index a1e505961a..4fbc5d0ae2 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2008-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2008-2014. 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
@@ -48,7 +48,7 @@
 	 userauth/2, connected/2]).
 
 -export([init/1, handle_event/3,
-	 handle_sync_event/4, handle_info/3, terminate/3, code_change/4]).
+	 handle_sync_event/4, handle_info/3, terminate/3, format_status/2, code_change/4]).
 
 -record(state, {
 	  role,
@@ -71,7 +71,8 @@
 	  connection_queue,
 	  address,
 	  port,
-	  opts
+	  opts,
+	  recbuf
 	 }). 
 
 -type state_name()           :: hello | kexinit | key_exchange | new_keys | userauth | connection.
@@ -301,28 +302,39 @@ info(ConnectionHandler, ChannelProcess) ->
 hello(socket_control, #state{socket = Socket, ssh_params = Ssh} = State) ->
     VsnMsg = ssh_transport:hello_version_msg(string_version(Ssh)),
     send_msg(VsnMsg, State),
-    inet:setopts(Socket, [{packet, line}, {active, once}]),
-    {next_state, hello, State};
+    {ok, [{recbuf, Size}]} = inet:getopts(Socket, [recbuf]),
+    inet:setopts(Socket, [{packet, line}, {active, once}, {recbuf, ?MAX_PROTO_VERSION}]),
+    {next_state, hello, State#state{recbuf = Size}};
 
-hello({info_line, _Line},#state{socket = Socket} = State) ->
+hello({info_line, _Line},#state{role = client, socket = Socket} = State) ->
+    %% The server may send info lines before the version_exchange
     inet:setopts(Socket, [{active, once}]),
     {next_state, hello, State};
 
+hello({info_line, _Line},#state{role = server} = State) ->
+    DisconnectMsg =
+	#ssh_msg_disconnect{code =
+				?SSH_DISCONNECT_PROTOCOL_ERROR,
+			    description = "Did not receive expected protocol version exchange",
+			    language = "en"},
+    handle_disconnect(DisconnectMsg, State);
+
 hello({version_exchange, Version}, #state{ssh_params = Ssh0,
-					  socket = Socket} = State) ->
+					  socket = Socket,
+					  recbuf = Size} = State) ->
     {NumVsn, StrVsn} = ssh_transport:handle_hello_version(Version),
     case handle_version(NumVsn, StrVsn, Ssh0) of
 	{ok, Ssh1} ->
-	    inet:setopts(Socket, [{packet,0}, {mode,binary}, {active, once}]),
+	    inet:setopts(Socket, [{packet,0}, {mode,binary}, {active, once}, {recbuf, Size}]),
 	    {KeyInitMsg, SshPacket, Ssh} = ssh_transport:key_exchange_init_msg(Ssh1),
 	    send_msg(SshPacket, State),
 	    {next_state, kexinit, next_packet(State#state{ssh_params = Ssh,
 							  key_exchange_init_msg = 
 							  KeyInitMsg})};
 	not_supported ->
-	   DisconnectMsg =
+	    DisconnectMsg =
 		#ssh_msg_disconnect{code = 
-				    ?SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED,
+					?SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED,
 				    description = "Protocol version " ++  StrVsn 
 				    ++ " not supported",
 				    language = "en"},
@@ -959,6 +971,36 @@ terminate_subsytem(#connection{system_supervisor = SysSup,
 terminate_subsytem(_) ->
     ok.
 
+format_status(normal, [_, State]) ->
+    [{data, [{"StateData", State}]}]; 
+format_status(terminate, [_, State]) ->
+    SshParams0 = (State#state.ssh_params),
+    SshParams = SshParams0#ssh{c_keyinit = "***",
+			       s_keyinit = "***",
+			       send_mac_key = "***",
+			       send_mac_size =  "***",
+			       recv_mac_key = "***",
+			       recv_mac_size = "***",
+			       encrypt_keys = "***",
+			       encrypt_ctx = "***",
+			       decrypt_keys = "***",
+			       decrypt_ctx = "***",
+			       compress_ctx = "***",
+			       decompress_ctx = "***",
+			       shared_secret =  "***",
+			       exchanged_hash =  "***",
+			       session_id =  "***", 
+			       keyex_key =  "***", 
+			       keyex_info = "***", 
+			       available_host_keys = "***"},
+    [{data, [{"StateData", State#state{decoded_data_buffer = "***",
+				       encoded_data_buffer =  "***",
+				       key_exchange_init_msg = "***",
+				       opts =  "***",
+				       recbuf =  "***",
+				       ssh_params = SshParams
+				      }}]}].
+
 %%--------------------------------------------------------------------
 -spec code_change(OldVsn::term(), state_name(), Oldstate::term(), Extra::term()) ->
 			 {ok, state_name(), #state{}}.
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index ea05c849b7..76fa776113 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2004-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2014. 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
@@ -82,16 +82,21 @@ format_version({Major,Minor}) ->
 	integer_to_list(Minor) ++ "-Erlang".
 
 handle_hello_version(Version) ->
-    StrVersion = trim_tail(Version),
-    case string:tokens(Version, "-") of
-	[_, "2.0" | _] ->
-	    {{2,0}, StrVersion}; 
-	[_, "1.99" | _] ->
-	    {{2,0}, StrVersion}; 
-	[_, "1.3" | _] ->
-	    {{1,3}, StrVersion}; 
-	[_, "1.5" | _] ->
-	    {{1,5}, StrVersion}
+    try
+	StrVersion = trim_tail(Version),
+	case string:tokens(Version, "-") of
+	    [_, "2.0" | _] ->
+		{{2,0}, StrVersion};
+	    [_, "1.99" | _] ->
+		{{2,0}, StrVersion};
+	    [_, "1.3" | _] ->
+		{{1,3}, StrVersion};
+	    [_, "1.5" | _] ->
+		{{1,5}, StrVersion}
+	end
+    catch
+	error:_ ->
+	    {undefined, "unknown version"}
     end.
 
 key_exchange_init_msg(Ssh0) ->