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%%%-------------------------------------------------------------------
%%% 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) 2002-2013 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_binary(Srv), is_binary(User), is_binary(Pass) ->
gen_server:call(?PROCNAME,
{authenticate, Srv, User, Pass}).
acct_mgmt(Srv, User)
when is_binary(Srv), is_binary(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 2049,
if Mode == 2049 -> ?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) ->
{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}.
|
