ssh: Gracefully handle incorrect versions

Conflicts:

	lib/ssh/test/ssh_connection_SUITE.erl

4 files changed, 138 insertions, 31 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 86804c4436..68736c3365 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
@@ -71,7 +71,8 @@
 	  connection_queue,
 	  address,
 	  port,
-	  opts
+	  opts,
+	  recbuf
 	 }). 
 
 -type state_name()           :: hello | kexinit | key_exchange | new_keys | userauth | connection.
@@ -293,28 +294,39 @@ 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"},
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) ->
diff --git a/lib/ssh/test/ssh_connection_SUITE.erl b/lib/ssh/test/ssh_connection_SUITE.erl
index c115ccee5f..d63b3f2a75 100644
--- a/lib/ssh/test/ssh_connection_SUITE.erl
+++ b/lib/ssh/test/ssh_connection_SUITE.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
@@ -31,8 +31,8 @@
 %% Common Test interface functions -----------------------------------
 %%--------------------------------------------------------------------
 
-suite() ->
-    [{ct_hooks,[ts_install_cth]}].
+%% suite() ->
+%%     [{ct_hooks,[ts_install_cth]}].
 
 all() ->
     [
@@ -40,7 +40,11 @@ all() ->
      interrupted_send,
      start_shell,
      start_shell_exec,
-     start_shell_exec_fun
+     start_shell_exec_fun,
+     gracefull_invalid_version,
+     gracefull_invalid_start,
+     gracefull_invalid_long_start,
+     gracefull_invalid_long_start_no_nl
     ].
 groups() ->
     [{openssh_payload, [], [simple_exec,
@@ -302,7 +306,7 @@ start_shell(Config) when is_list(Config) ->
     ok = ssh_connection:shell(ConnectionRef,ChannelId0),
 
     receive
-    {ssh_cm,ConnectionRef, {data, ChannelId, 0, <<"Enter command\r\n">>}} ->
+    {ssh_cm,ConnectionRef, {data, ChannelId0, 0, <<"Enter command\r\n">>}} ->
         ok
     after 5000 ->
         ct:fail("CLI Timeout")
@@ -333,10 +337,10 @@ start_shell_exec(Config) when is_list(Config) ->
     {ok, ChannelId0} = ssh_connection:session_channel(ConnectionRef, infinity),
 
     success = ssh_connection:exec(ConnectionRef, ChannelId0,
-                  "testing", infinity),
+				  "testing", infinity),
     receive
-    {ssh_cm,ConnectionRef, {data, ChannelId, 0, <<"testing\r\n">>}} ->
-        ok
+	{ssh_cm,ConnectionRef, {data, ChannelId0, 0, <<"testing\r\n">>}} ->
+	    ok
     after 5000 ->
         ct:fail("Exec Timeout")
     end,
@@ -370,14 +374,99 @@ start_shell_exec_fun(Config) when is_list(Config) ->
                   "testing", infinity),
 
     receive
-    {ssh_cm,ConnectionRef, {data, ChannelId, 0, <<"testing\r\n">>}} ->
-        ok
+	{ssh_cm,ConnectionRef, {data, ChannelId0, 0, <<"testing\r\n">>}} ->
+	    ok
     after 5000 ->
         ct:fail("Exec Timeout")
     end,
 
     ssh:close(ConnectionRef),
     ssh:stop_daemon(Pid).
+
+%%--------------------------------------------------------------------
+
+gracefull_invalid_version(Config) when is_list(Config) ->
+    PrivDir = ?config(priv_dir, Config),
+    UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+    file:make_dir(UserDir),
+    SysDir = ?config(data_dir, Config),
+    {_Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+					     {user_dir, UserDir},
+					     {password, "morot"}]),
+
+    {ok, S} = gen_tcp:connect(Host, Port, []),
+    ok = gen_tcp:send(S,  ["SSH-8.-1","\r\n"]),
+    receive
+	Verstring ->
+	    ct:pal("Server version: ~p~n", [Verstring]),
+	    receive
+		{tcp_closed, S} ->
+		    ok
+	    end
+    end.
+
+gracefull_invalid_start(Config) when is_list(Config) ->
+    PrivDir = ?config(priv_dir, Config),
+    UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+    file:make_dir(UserDir),
+    SysDir = ?config(data_dir, Config),
+    {_Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+					     {user_dir, UserDir},
+					     {password, "morot"}]),
+
+    {ok, S} = gen_tcp:connect(Host, Port, []),
+    ok = gen_tcp:send(S,  ["foobar","\r\n"]),
+    receive
+	Verstring ->
+	    ct:pal("Server version: ~p~n", [Verstring]),
+	    receive
+		{tcp_closed, S} ->
+		    ok
+	    end
+    end.
+
+gracefull_invalid_long_start(Config) when is_list(Config) ->
+    PrivDir = ?config(priv_dir, Config),
+    UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+    file:make_dir(UserDir),
+    SysDir = ?config(data_dir, Config),
+    {_Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+					     {user_dir, UserDir},
+					     {password, "morot"}]),
+
+    {ok, S} = gen_tcp:connect(Host, Port, []),
+    ok = gen_tcp:send(S, [lists:duplicate(257, $a), "\r\n"]),
+    receive
+	Verstring ->
+	    ct:pal("Server version: ~p~n", [Verstring]),
+	    receive
+		{tcp_closed, S} ->
+		    ok
+	    end
+    end.
+
+
+gracefull_invalid_long_start_no_nl(Config) when is_list(Config) ->
+    PrivDir = ?config(priv_dir, Config),
+    UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+    file:make_dir(UserDir),
+    SysDir = ?config(data_dir, Config),
+    {_Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+					     {user_dir, UserDir},
+					     {password, "morot"}]),
+
+    {ok, S} = gen_tcp:connect(Host, Port, []),
+    ok = gen_tcp:send(S, [lists:duplicate(257, $a), "\r\n"]),
+    receive
+	Verstring ->
+	    ct:pal("Server version: ~p~n", [Verstring]),
+	    receive
+		{tcp_closed, S} ->
+		    ok
+	    end
+    end.
+
+
 %%--------------------------------------------------------------------
 %% Internal functions ------------------------------------------------
 %%--------------------------------------------------------------------