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
|
%%%-------------------------------------------------------------------
%%% File : epam.erl
%%% Author : Evgeniy Khramtsov <xram@jabber.ru>
%%% Purpose : PAM authentication and accounting management
%%% Created : 5 Jul 2007 by Evgeniy Khramtsov <xram@jabber.ru>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2008 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%-------------------------------------------------------------------
-module(epam).
-author('xram@jabber.ru').
-behaviour(gen_server).
-include_lib("kernel/include/file.hrl").
-include("ejabberd.hrl").
%% API
-export([start_link/0, start/0, stop/0]).
-export([authenticate/3, acct_mgmt/2]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(WARNING, "File ~p is world-wide executable. "
"This is a possible security hole in your system. "
"This file must be setted root on execution "
"and only ejabberd must be able to read/execute it. "
"You have been warned :)").
-define(PROCNAME, ?MODULE).
-define(CMD_AUTH, 0).
-define(CMD_ACCT, 1).
-record(state, {port}).
%%====================================================================
%% API
%%====================================================================
start() ->
ChildSpec = {
?PROCNAME, {?MODULE, start_link, []},
transient, 1000, worker, [?MODULE]
},
supervisor:start_child(ejabberd_sup, ChildSpec).
stop() ->
gen_server:call(?PROCNAME, stop),
supervisor:terminate_child(ejabberd_sup, ?PROCNAME),
supervisor:delete_child(ejabberd_sup, ?PROCNAME).
start_link() ->
gen_server:start_link({local, ?PROCNAME}, ?MODULE, [], []).
authenticate(Srv, User, Pass) when is_list(Srv), is_list(User), is_list(Pass) ->
gen_server:call(?PROCNAME, {authenticate, Srv, User, Pass}).
acct_mgmt(Srv, User) when is_list(Srv), is_list(User) ->
gen_server:call(?PROCNAME, {acct_mgmt, Srv, User}).
%%====================================================================
%% gen_server callbacks
%%====================================================================
init([]) ->
FileName = filename:join(ejabberd:get_bin_path(), "epam"),
case file:read_file_info(FileName) of
{ok, Info} ->
Mode = Info#file_info.mode band 16#801,
if Mode == 16#801 ->
?WARNING_MSG(?WARNING, [FileName]);
true -> ok
end,
Port = open_port({spawn, FileName}, [{packet, 2}, binary, exit_status]),
{ok, #state{port = Port}};
{error, Reason} ->
?ERROR_MSG("Can't open file ~p: ~p", [FileName, Reason]),
error
end.
terminate(_Reason, #state{port = Port}) ->
catch port_close(Port),
ok.
handle_call({authenticate, Srv, User, Pass}, From, State) ->
Port = State#state.port,
Data = term_to_binary({?CMD_AUTH, From, {Srv, User, Pass}}),
port_command(Port, Data),
{noreply, State};
handle_call({acct_mgmt, Srv, User}, From, State) ->
Port = State#state.port,
Data = term_to_binary({?CMD_ACCT, From, {Srv, User}}),
port_command(Port, Data),
{noreply, State};
handle_call(stop, _From, State) ->
{stop, normal, ok, State};
handle_call(_Request, _From, State) ->
{reply, bad_request, State}.
handle_info({Port, {data, Data}}, #state{port=Port} = State) ->
case binary_to_term(Data) of
{Cmd, To, Reply} when Cmd==?CMD_AUTH; Cmd==?CMD_ACCT ->
gen_server:reply(To, Reply);
Err ->
?ERROR_MSG("Got invalid reply from ~p: ~p", [Port, Err])
end,
{noreply, State};
handle_info({Port, {exit_status, _}}, #state{port=Port} = State) ->
%% We can restart the port here, but, I think, it is not a good idea,
%% since we can run into infinity loop. So let the supervisor restart us.
{stop, port_died, State};
handle_info(Msg, State) ->
?WARNING_MSG("Got unexpected message: ~p", [Msg]),
{noreply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
|
