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authorIngela Anderton Andin <[email protected]>2014-10-17 09:53:02 +0200
committerHans Nilsson <[email protected]>2014-10-17 11:51:56 +0200
commit6351f65ae896274c7ff1cc62561a20b7c37b324c (patch)
tree41a9e1d6a3aaffa4fac8c45b66e33d2701d1795e /lib
parent545a85827e65c9939b701a87b60adf7a58c373fa (diff)
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ssh: Gracefully handle bad handshake messages
Diffstat (limited to 'lib')
-rw-r--r--lib/ssh/src/ssh_connection.erl2
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl48
2 files changed, 35 insertions, 15 deletions
diff --git a/lib/ssh/src/ssh_connection.erl b/lib/ssh/src/ssh_connection.erl
index 33849f4527..83bfad7900 100644
--- a/lib/ssh/src/ssh_connection.erl
+++ b/lib/ssh/src/ssh_connection.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
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index 678ec89e44..c2413e0503 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -565,7 +565,7 @@ connected({#ssh_msg_kexinit{}, _Payload} = Event, State) ->
%%--------------------------------------------------------------------
handle_event(#ssh_msg_disconnect{description = Desc} = DisconnectMsg, _StateName, #state{} = State) ->
- handle_disconnect(DisconnectMsg, State),
+ handle_disconnect(peer, DisconnectMsg, State),
{stop, {shutdown, Desc}, State};
handle_event(#ssh_msg_ignore{}, StateName, State) ->
@@ -1280,13 +1280,23 @@ generate_event(<<?BYTE(Byte), _/binary>> = Msg, StateName,
generate_event(Msg, StateName, State0, EncData) ->
Event = ssh_message:decode(Msg),
State = generate_event_new_state(State0, EncData),
- case Event of
- #ssh_msg_kexinit{} ->
- %% We need payload for verification later.
- event({Event, Msg}, StateName, State);
- _ ->
- event(Event, StateName, State)
- end.
+ try
+ case Event of
+ #ssh_msg_kexinit{} ->
+ %% We need payload for verification later.
+ event({Event, Msg}, StateName, State);
+ _ ->
+ event(Event, StateName, State)
+ end
+ catch
+ _:_ ->
+ DisconnectMsg =
+ #ssh_msg_disconnect{code = ?SSH_DISCONNECT_PROTOCOL_ERROR,
+ description = "Encountered unexpected input",
+ language = "en"},
+ handle_disconnect(DisconnectMsg, State)
+ end.
+
handle_request(ChannelPid, ChannelId, Type, Data, WantReply, From,
@@ -1464,17 +1474,27 @@ handle_ssh_packet(Length, StateName, #state{decoded_data_buffer = DecData0,
handle_disconnect(DisconnectMsg, State0)
end.
-handle_disconnect(#ssh_msg_disconnect{description = Desc} = Msg, #state{connection_state = Connection0,
- role = Role} = State0) ->
+handle_disconnect(DisconnectMsg, State) ->
+ handle_disconnect(own, DisconnectMsg, State).
+
+handle_disconnect(#ssh_msg_disconnect{} = DisconnectMsg, State, Error) ->
+ handle_disconnect(own, DisconnectMsg, State, Error);
+handle_disconnect(Type, #ssh_msg_disconnect{description = Desc} = Msg, #state{connection_state = Connection0, role = Role} = State0) ->
{disconnect, _, {{replies, Replies}, Connection}} = ssh_connection:handle_msg(Msg, Connection0, Role),
- State = send_replies(Replies, State0),
+ State = send_replies(disconnect_replies(Type, Msg, Replies), State0),
{stop, {shutdown, Desc}, State#state{connection_state = Connection}}.
-handle_disconnect(#ssh_msg_disconnect{description = Desc} = Msg, #state{connection_state = Connection0,
- role = Role} = State0, ErrorMsg) ->
+
+handle_disconnect(Type, #ssh_msg_disconnect{description = Desc} = Msg, #state{connection_state = Connection0,
+ role = Role} = State0, ErrorMsg) ->
{disconnect, _, {{replies, Replies}, Connection}} = ssh_connection:handle_msg(Msg, Connection0, Role),
- State = send_replies(Replies, State0),
+ State = send_replies(disconnect_replies(Type, Msg, Replies), State0),
{stop, {shutdown, {Desc, ErrorMsg}}, State#state{connection_state = Connection}}.
+disconnect_replies(own, Msg, Replies) ->
+ [{connection_reply, Msg} | Replies];
+disconnect_replies(peer, _, Replies) ->
+ Replies.
+
counterpart_versions(NumVsn, StrVsn, #ssh{role = server} = Ssh) ->
Ssh#ssh{c_vsn = NumVsn , c_version = StrVsn};
counterpart_versions(NumVsn, StrVsn, #ssh{role = client} = Ssh) ->