1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2021. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: Handles an ssh connection, e.i. both the
%% setup SSH Transport Layer Protocol (RFC 4253), Authentication
%% Protocol (RFC 4252) and SSH connection Protocol (RFC 4255)
%% Details of the different protocols are
%% implemented in ssh_transport.erl, ssh_auth.erl and ssh_connection.erl
%% ----------------------------------------------------------------------
-module(ssh_fsm_userauth_client).
-include("ssh.hrl").
-include("ssh_transport.hrl").
-include("ssh_auth.hrl").
-include("ssh_connect.hrl").
-include("ssh_fsm.hrl").
%%====================================================================
%%% Exports
%%====================================================================
%%% Behaviour callbacks
-export([callback_mode/0, handle_event/4, terminate/3,
format_status/2, code_change/4]).
%%====================================================================
%% gen_statem callbacks
%%====================================================================
callback_mode() ->
[handle_event_function,
state_enter].
%%--------------------------------------------------------------------
%%% ######## {userauth, client} ####
%%---- #ssh_msg_ext_info could follow after the key exchange, both the intial and the re-negotiation
handle_event(internal, #ssh_msg_ext_info{}=Msg, {userauth,client}, D0) ->
%% FIXME: need new state to receive this msg!
D = ssh_connection_handler:handle_ssh_msg_ext_info(Msg, D0),
{keep_state, D};
%%---- recevied userauth success from the server
handle_event(internal, #ssh_msg_userauth_success{}, {userauth,client}, D0=#data{ssh_params = Ssh}) ->
ssh_auth:ssh_msg_userauth_result(success),
ssh_connection_handler:handshake(ssh_connected, D0),
D = D0#data{ssh_params=Ssh#ssh{authenticated = true}},
{next_state, {connected,client}, D, {change_callback_module,ssh_connection_handler}};
%%---- userauth failure response to clientfrom the server
handle_event(internal, #ssh_msg_userauth_failure{}, {userauth,client}=StateName,
#data{ssh_params = #ssh{userauth_methods = []}} = D0) ->
{Shutdown, D} =
?send_disconnect(?SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE,
io_lib:format("User auth failed for: ~p",[D0#data.auth_user]),
StateName, D0),
{stop, Shutdown, D};
handle_event(internal, #ssh_msg_userauth_failure{authentications = Methods}, StateName={userauth,client},
D0 = #data{ssh_params = Ssh0}) ->
%% The prefered authentication method failed, try next method
Ssh1 = case Ssh0#ssh.userauth_methods of
none ->
%% Server tells us which authentication methods that are allowed
Ssh0#ssh{userauth_methods = string:tokens(Methods, ",")};
_ ->
%% We already know...
Ssh0
end,
case ssh_auth:userauth_request_msg(Ssh1) of
{send_disconnect, Code, Ssh} ->
{Shutdown, D} =
?send_disconnect(Code,
io_lib:format("User auth failed for: ~p",[D0#data.auth_user]),
StateName, D0#data{ssh_params = Ssh}),
{stop, Shutdown, D};
{"keyboard-interactive", {Msg, Ssh}} ->
D = ssh_connection_handler:send_msg(Msg, D0#data{ssh_params = Ssh}),
{next_state, {userauth_keyboard_interactive,client}, D};
{_Method, {Msg, Ssh}} ->
D = ssh_connection_handler:send_msg(Msg, D0#data{ssh_params = Ssh}),
{keep_state, D}
end;
%%---- banner to client
handle_event(internal, #ssh_msg_userauth_banner{message = Msg}, {userauth,client}, D) ->
case D#data.ssh_params#ssh.userauth_quiet_mode of
false -> io:format("~s", [Msg]);
true -> ok
end,
keep_state_and_data;
%%% ######## {userauth_keyboard_interactive, client}
handle_event(internal, #ssh_msg_userauth_info_request{} = Msg, {userauth_keyboard_interactive, client},
#data{ssh_params = Ssh0} = D0) ->
case ssh_auth:handle_userauth_info_request(Msg, Ssh0) of
{ok, {Reply, Ssh}} ->
D = ssh_connection_handler:send_msg(Reply, D0#data{ssh_params = Ssh}),
{next_state, {userauth_keyboard_interactive_info_response,client}, D};
not_ok ->
{next_state, {userauth,client}, D0, [postpone]}
end;
handle_event(internal, #ssh_msg_userauth_failure{}, {userauth_keyboard_interactive, client},
#data{ssh_params = Ssh0} = D0) ->
Prefs = [{Method,M,F,A} || {Method,M,F,A} <- Ssh0#ssh.userauth_preference,
Method =/= "keyboard-interactive"],
D = D0#data{ssh_params = Ssh0#ssh{userauth_preference=Prefs}},
{next_state, {userauth,client}, D, [postpone]};
handle_event(internal, #ssh_msg_userauth_failure{}, {userauth_keyboard_interactive_info_response, client},
#data{ssh_params = Ssh0} = D0) ->
Opts = Ssh0#ssh.opts,
D = case ?GET_OPT(password, Opts) of
undefined ->
D0;
_ ->
D0#data{ssh_params =
Ssh0#ssh{opts = ?PUT_OPT({password,not_ok}, Opts)}} % FIXME:intermodule dependency
end,
{next_state, {userauth,client}, D, [postpone]};
handle_event(internal, #ssh_msg_ext_info{}=Msg, {userauth_keyboard_interactive_info_response, client}, D0) ->
%% FIXME: need new state to receive this msg!
D = ssh_connection_handler:handle_ssh_msg_ext_info(Msg, D0),
{keep_state, D};
handle_event(internal, #ssh_msg_userauth_success{}, {userauth_keyboard_interactive_info_response, client}, D) ->
{next_state, {userauth,client}, D, [postpone]};
handle_event(internal, #ssh_msg_userauth_info_request{}, {userauth_keyboard_interactive_info_response, client}, D) ->
{next_state, {userauth_keyboard_interactive,client}, D, [postpone]};
%%% ######## UNHANDLED EVENT!
handle_event(Type, Event, StateName, D) ->
ssh_connection_handler:handle_event(Type, Event, StateName, D).
%%--------------------------------------------------------------------
format_status(A, B) ->
ssh_connection_handler:format_status(A, B).
%%--------------------------------------------------------------------
terminate(Reason, StateName, D) ->
ssh_connection_handler:terminate(Reason, StateName, D).
%%--------------------------------------------------------------------
code_change(_OldVsn, StateName, State, _Extra) ->
{ok, StateName, State}.
%%====================================================================
%% Internal functions
%%====================================================================
|
