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authorHans Nilsson <[email protected]>2015-05-12 17:03:28 +0200
committerHans Nilsson <[email protected]>2015-05-13 13:01:18 +0200
commit7aef211a66219b6fef9d0bdaf9b09be6c2e0a32f (patch)
tree11f438cff113ba9b6814711dbab8d7da5efc5564 /lib/ssh
parentefbfe9602983ff451b864e557bdf3733222b78ba (diff)
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ssh: option for handling the SSH_MSG_DEBUG message's printouts
A fun could be given in the options that will be called whenever the SSH_MSG_DEBUG message arrives. This enables the user to format the printout or just discard it. The default is changed to not print the message. In RFC4253 printing is a SHOULD, but our new default is to protect logs from dos attacs.
Diffstat (limited to 'lib/ssh')
-rw-r--r--lib/ssh/doc/src/ssh.xml20
-rw-r--r--lib/ssh/src/ssh.erl4
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl12
-rw-r--r--lib/ssh/test/ssh_basic_SUITE.erl90
-rw-r--r--lib/ssh/vsn.mk2
5 files changed, 119 insertions, 9 deletions
diff --git a/lib/ssh/doc/src/ssh.xml b/lib/ssh/doc/src/ssh.xml
index 72dafc0c09..501668ca78 100644
--- a/lib/ssh/doc/src/ssh.xml
+++ b/lib/ssh/doc/src/ssh.xml
@@ -201,6 +201,14 @@
<tag><c><![CDATA[{idle_time, integer()}]]></c></tag>
<item>
<p>Sets a timeout on connection when no channels are active, default is infinity</p></item>
+
+ <tag><c><![CDATA[{ssh_msg_debug_fun, fun(ConnectionRef::ssh_connection_ref(), AlwaysDisplay::boolean(), Msg::binary(), LanguageTag::binary()) -> _}]]></c></tag>
+ <item>
+ <p>Provide a fun to implement your own logging of the SSH message SSH_MSG_DEBUG. The last three parameters are from the message, see RFC4253, section 11.3. The <c>ConnectionRef</c> is the reference to the connection on which the message arrived. The return value from the fun is not checked.</p>
+ <p>The default behaviour is ignore the message.
+ To get a printout for each message with <c>AlwaysDisplay = true</c>, use for example <c>{ssh_msg_debug_fun, fun(_,true,M,_)-> io:format("DEBUG: ~p~n", [M]) end}</c></p>
+ </item>
+
</taglist>
</desc>
</func>
@@ -383,8 +391,16 @@
<item>
<p>Provide a fun to implement your own logging when a user disconnects from the server.</p>
</item>
- </taglist>
- </desc>
+
+ <tag><c><![CDATA[{ssh_msg_debug_fun, fun(ConnectionRef::ssh_connection_ref(), AlwaysDisplay::boolean(), Msg::binary(), LanguageTag::binary()) -> _}]]></c></tag>
+ <item>
+ <p>Provide a fun to implement your own logging of the SSH message SSH_MSG_DEBUG. The last three parameters are from the message, see RFC4253, section 11.3. The <c>ConnectionRef</c> is the reference to the connection on which the message arrived. The return value from the fun is not checked.</p>
+ <p>The default behaviour is ignore the message.
+ To get a printout for each message with <c>AlwaysDisplay = true</c>, use for example <c>{ssh_msg_debug_fun, fun(_,true,M,_)-> io:format("DEBUG: ~p~n", [M]) end}</c></p>
+ </item>
+
+ </taglist>
+ </desc>
</func>
diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index d4b02a024e..71e7d77475 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -312,6 +312,8 @@ handle_option([{disconnectfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{failfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
+handle_option([{ssh_msg_debug_fun, _} = Opt | Rest], SocketOptions, SshOptions) ->
+ handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
%%Backwards compatibility should not be underscore between ip and v6 in API
handle_option([{ip_v6_disabled, Value} | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option({ipv6_disabled, Value}) | SshOptions]);
@@ -417,6 +419,8 @@ handle_ssh_option({disconnectfun , Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({failfun, Value} = Opt) when is_function(Value) ->
Opt;
+handle_ssh_option({ssh_msg_debug_fun, Value} = Opt) when is_function(Value,4) ->
+ Opt;
handle_ssh_option({ipv6_disabled, Value} = Opt) when is_boolean(Value) ->
throw({error, {{ipv6_disabled, Opt}, option_no_longer_valid_use_inet_option_instead}});
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index e1f2e059e8..0f6162db60 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -580,12 +580,12 @@ handle_event(#ssh_msg_disconnect{description = Desc} = DisconnectMsg, _StateName
handle_event(#ssh_msg_ignore{}, StateName, State) ->
{next_state, StateName, next_packet(State)};
-handle_event(#ssh_msg_debug{always_display = true, message = DbgMsg},
- StateName, State) ->
- io:format("DEBUG: ~p\n", [DbgMsg]),
- {next_state, StateName, next_packet(State)};
-
-handle_event(#ssh_msg_debug{}, StateName, State) ->
+handle_event(#ssh_msg_debug{always_display = Display, message = DbgMsg, language=Lang},
+ StateName, #state{opts = Opts} = State) ->
+ F = proplists:get_value(ssh_msg_debug_fun, Opts,
+ fun(_ConnRef, _AlwaysDisplay, _Msg, _Language) -> ok end
+ ),
+ catch F(self(), Display, DbgMsg, Lang),
{next_state, StateName, next_packet(State)};
handle_event(#ssh_msg_unimplemented{}, StateName, State) ->
diff --git a/lib/ssh/test/ssh_basic_SUITE.erl b/lib/ssh/test/ssh_basic_SUITE.erl
index f5f8991acc..fa7b426545 100644
--- a/lib/ssh/test/ssh_basic_SUITE.erl
+++ b/lib/ssh/test/ssh_basic_SUITE.erl
@@ -52,6 +52,8 @@ all() ->
ssh_connect_arg4_timeout,
packet_size_zero,
ssh_daemon_minimal_remote_max_packet_size_option,
+ ssh_msg_debug_fun_option_client,
+ ssh_msg_debug_fun_option_server,
id_string_no_opt_client,
id_string_own_string_client,
id_string_random_client,
@@ -494,6 +496,94 @@ server_userpassword_option(Config) when is_list(Config) ->
ssh:stop_daemon(Pid).
%%--------------------------------------------------------------------
+ssh_msg_debug_fun_option_client() ->
+ [{doc, "validate client that uses the 'ssh_msg_debug_fun' option"}].
+ssh_msg_debug_fun_option_client(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"},
+ {failfun, fun ssh_test_lib:failfun/2}]),
+ Parent = self(),
+ DbgFun = fun(ConnRef,Displ,Msg,Lang) -> Parent ! {msg_dbg,{ConnRef,Displ,Msg,Lang}} end,
+
+ ConnectionRef =
+ ssh_test_lib:connect(Host, Port, [{silently_accept_hosts, true},
+ {user, "foo"},
+ {password, "morot"},
+ {user_dir, UserDir},
+ {user_interaction, false},
+ {ssh_msg_debug_fun,DbgFun}]),
+ %% Beware, implementation knowledge:
+ gen_fsm:send_all_state_event(ConnectionRef,{ssh_msg_debug,false,<<"Hello">>,<<>>}),
+ receive
+ {msg_dbg,X={ConnectionRef,false,<<"Hello">>,<<>>}} ->
+ ct:log("Got expected dbg msg ~p",[X]),
+ ssh:stop_daemon(Pid);
+ {msg_dbg,X={_,false,<<"Hello">>,<<>>}} ->
+ ct:log("Got dbg msg but bad ConnectionRef (~p expected) ~p",[ConnectionRef,X]),
+ ssh:stop_daemon(Pid),
+ {fail, "Bad ConnectionRef received"};
+ {msg_dbg,X} ->
+ ct:log("Got bad dbg msg ~p",[X]),
+ ssh:stop_daemon(Pid),
+ {fail,"Bad msg received"}
+ after 1000 ->
+ ssh:stop_daemon(Pid),
+ {fail,timeout}
+ end.
+
+%%--------------------------------------------------------------------
+ssh_msg_debug_fun_option_server() ->
+ [{doc, "validate client that uses the 'ssh_msg_debug_fun' option"}].
+ssh_msg_debug_fun_option_server(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),
+
+ Parent = self(),
+ DbgFun = fun(ConnRef,Displ,Msg,Lang) -> Parent ! {msg_dbg,{ConnRef,Displ,Msg,Lang}} end,
+ ConnFun = fun(_,_,_) -> Parent ! {connection_pid,self()} end,
+
+ {Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+ {user_dir, UserDir},
+ {password, "morot"},
+ {failfun, fun ssh_test_lib:failfun/2},
+ {connectfun, ConnFun},
+ {ssh_msg_debug_fun, DbgFun}]),
+ _ConnectionRef =
+ ssh_test_lib:connect(Host, Port, [{silently_accept_hosts, true},
+ {user, "foo"},
+ {password, "morot"},
+ {user_dir, UserDir},
+ {user_interaction, false}]),
+ receive
+ {connection_pid,Server} ->
+ %% Beware, implementation knowledge:
+ gen_fsm:send_all_state_event(Server,{ssh_msg_debug,false,<<"Hello">>,<<>>}),
+ receive
+ {msg_dbg,X={_,false,<<"Hello">>,<<>>}} ->
+ ct:log("Got expected dbg msg ~p",[X]),
+ ssh:stop_daemon(Pid);
+ {msg_dbg,X} ->
+ ct:log("Got bad dbg msg ~p",[X]),
+ ssh:stop_daemon(Pid),
+ {fail,"Bad msg received"}
+ after 3000 ->
+ ssh:stop_daemon(Pid),
+ {fail,timeout2}
+ end
+ after 3000 ->
+ ssh:stop_daemon(Pid),
+ {fail,timeout1}
+ end.
+
+%%--------------------------------------------------------------------
known_hosts() ->
[{doc, "check that known_hosts is updated correctly"}].
known_hosts(Config) when is_list(Config) ->
diff --git a/lib/ssh/vsn.mk b/lib/ssh/vsn.mk
index b2b85a717f..40bda0c19f 100644
--- a/lib/ssh/vsn.mk
+++ b/lib/ssh/vsn.mk
@@ -1,4 +1,4 @@
#-*-makefile-*- ; force emacs to enter makefile-mode
-SSH_VSN = 3.2.2
+SSH_VSN = 3.2.3
APP_VSN = "ssh-$(SSH_VSN)"