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xmpp.chapril.org-ejabberd/src/extauth.erl

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%%%----------------------------------------------------------------------
%%% File : extauth.erl
%%% Author : Leif Johansson <leifj@it.su.se>
%%% Purpose : External authentication using a simple port-driver
%%% Created : 30 Jul 2004 by Leif Johansson <leifj@it.su.se>
%%%
%%%
2011-02-14 13:50:55 +01:00
%%% ejabberd, Copyright (C) 2002-2011 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(extauth).
-author('leifj@it.su.se').
-export([start/2,
stop/1,
init/2,
check_password/3,
set_password/3,
try_register/3,
remove_user/2,
remove_user/3,
is_user_exists/2]).
-include("ejabberd.hrl").
-define(INIT_TIMEOUT, 60000). % Timeout is in milliseconds: 60 seconds == 60000
-define(CALL_TIMEOUT, 10000). % Timeout is in milliseconds: 10 seconds == 10000
start(Host, ExtPrg) ->
lists:foreach(
fun(This) ->
spawn(?MODULE, init, [get_process_name(Host, This), ExtPrg])
end,
lists:seq(0, get_instances(Host)-1)
).
init(ProcessName, ExtPrg) ->
register(ProcessName, self()),
process_flag(trap_exit,true),
Port = open_port({spawn, ExtPrg}, [{packet,2}]),
loop(Port, ?INIT_TIMEOUT, ProcessName, ExtPrg).
stop(Host) ->
lists:foreach(
fun(This) ->
get_process_name(Host, This) ! stop
end,
lists:seq(0, get_instances(Host)-1)
).
get_process_name(Host, Integer) ->
gen_mod:get_module_proc(lists:append([Host, integer_to_list(Integer)]), eauth).
check_password(User, Server, Password) ->
call_port(Server, ["auth", User, Server, Password]).
is_user_exists(User, Server) ->
call_port(Server, ["isuser", User, Server]).
set_password(User, Server, Password) ->
call_port(Server, ["setpass", User, Server, Password]).
try_register(User, Server, Password) ->
case call_port(Server, ["tryregister", User, Server, Password]) of
true -> {atomic, ok};
false -> {error, not_allowed}
end.
remove_user(User, Server) ->
call_port(Server, ["removeuser", User, Server]).
remove_user(User, Server, Password) ->
call_port(Server, ["removeuser3", User, Server, Password]).
call_port(Server, Msg) ->
LServer = jlib:nameprep(Server),
ProcessName = get_process_name(LServer, random_instance(get_instances(LServer))),
ProcessName ! {call, self(), Msg},
receive
{eauth,Result} ->
Result
end.
random_instance(MaxNum) ->
{A1,A2,A3} = now(),
random:seed(A1, A2, A3),
random:uniform(MaxNum) - 1.
get_instances(Server) ->
case ejabberd_config:get_local_option({extauth_instances, Server}) of
Num when is_integer(Num) -> Num;
_ -> 1
end.
loop(Port, Timeout, ProcessName, ExtPrg) ->
receive
{call, Caller, Msg} ->
port_command(Port, encode(Msg)),
receive
{Port, {data, Data}} ->
?DEBUG("extauth call '~p' received data response:~n~p", [Msg, Data]),
Caller ! {eauth, decode(Data)},
loop(Port, ?CALL_TIMEOUT, ProcessName, ExtPrg);
{Port, Other} ->
?ERROR_MSG("extauth call '~p' received strange response:~n~p", [Msg, Other]),
Caller ! {eauth, false},
loop(Port, ?CALL_TIMEOUT, ProcessName, ExtPrg)
after
Timeout ->
?ERROR_MSG("extauth call '~p' didn't receive response", [Msg]),
Caller ! {eauth, false},
unregister(ProcessName),
spawn(?MODULE, init, [ProcessName, ExtPrg]),
exit(port_terminated)
end;
stop ->
Port ! {self(), close},
receive
{Port, closed} ->
exit(normal)
end;
{'EXIT', Port, Reason} ->
?CRITICAL_MSG("~p ~n", [Reason]),
exit(port_terminated)
end.
join(List, Sep) ->
lists:foldl(fun(A, "") -> A;
(A, Acc) -> Acc ++ Sep ++ A
end, "", List).
encode(L) ->
join(L,":").
decode([0,0]) ->
false;
decode([0,1]) ->
true.