mirror of
https://github.com/processone/ejabberd.git
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162 lines
4.9 KiB
Erlang
162 lines
4.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : extauth.erl
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%%% Author : Leif Johansson <leifj@it.su.se>
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%%% Purpose : External authentication using a simple port-driver
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%%% Created : 30 Jul 2004 by Leif Johansson <leifj@it.su.se>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(extauth).
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-behaviour(ejabberd_config).
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-author('leifj@it.su.se').
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-export([start/2, stop/1, init/2, check_password/3,
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set_password/3, try_register/3, remove_user/2,
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remove_user/3, user_exists/2, opt_type/1]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-define(INIT_TIMEOUT, 60000).
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-define(CALL_TIMEOUT, 10000).
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start(Host, ExtPrg) ->
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lists:foreach(fun (This) ->
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start_instance(get_process_name(Host, This), ExtPrg)
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end,
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lists:seq(0, get_instances(Host) - 1)).
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start_instance(ProcessName, ExtPrg) ->
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spawn(?MODULE, init, [ProcessName, ExtPrg]).
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restart_instance(ProcessName, ExtPrg) ->
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unregister(ProcessName),
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start_instance(ProcessName, ExtPrg).
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init(ProcessName, ExtPrg) ->
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register(ProcessName, self()),
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process_flag(trap_exit, true),
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Port = open_port({spawn, ExtPrg}, [{packet, 2}]),
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loop(Port, ?INIT_TIMEOUT, ProcessName, ExtPrg).
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stop(Host) ->
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lists:foreach(fun (This) ->
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get_process_name(Host, This) ! stop
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end,
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lists:seq(0, get_instances(Host) - 1)).
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get_process_name(Host, Integer) ->
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gen_mod:get_module_proc(iolist_to_binary([Host,
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integer_to_list(Integer)]),
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eauth).
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check_password(User, Server, Password) ->
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call_port(Server, [<<"auth">>, User, Server, Password]).
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user_exists(User, Server) ->
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call_port(Server, [<<"isuser">>, User, Server]).
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set_password(User, Server, Password) ->
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call_port(Server, [<<"setpass">>, User, Server, Password]).
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try_register(User, Server, Password) ->
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case call_port(Server,
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[<<"tryregister">>, User, Server, Password])
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of
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true -> ok;
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false -> {error, not_allowed}
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end.
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remove_user(User, Server) ->
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call_port(Server, [<<"removeuser">>, User, Server]).
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remove_user(User, Server, Password) ->
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call_port(Server,
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[<<"removeuser3">>, User, Server, Password]).
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call_port(Server, Msg) ->
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LServer = jid:nameprep(Server),
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ProcessName = get_process_name(LServer,
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random_instance(get_instances(LServer))),
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ProcessName ! {call, self(), Msg},
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receive {eauth, Result} -> Result end.
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random_instance(MaxNum) ->
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randoms:uniform(MaxNum) - 1.
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get_instances(Server) ->
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ejabberd_config:get_option({extauth_instances, Server}, 1).
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loop(Port, Timeout, ProcessName, ExtPrg) ->
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receive
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{call, Caller, Msg} ->
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port_command(Port, encode(Msg)),
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receive
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{Port, {data, Data}} ->
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?DEBUG("extauth call '~p' received data response:~n~p",
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[Msg, Data]),
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Caller ! {eauth, decode(Data)},
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loop(Port, ?CALL_TIMEOUT, ProcessName, ExtPrg);
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{Port, Other} ->
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?ERROR_MSG("extauth call '~p' received strange response:~n~p",
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[Msg, Other]),
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Caller ! {eauth, false},
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loop(Port, ?CALL_TIMEOUT, ProcessName, ExtPrg)
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after Timeout ->
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?ERROR_MSG("extauth call '~p' didn't receive response",
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[Msg]),
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Caller ! {eauth, false},
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Pid = restart_instance(ProcessName, ExtPrg),
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flush_buffer_and_forward_messages(Pid),
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exit(port_terminated)
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end;
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stop ->
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Port ! {self(), close},
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receive {Port, closed} -> exit(normal) end;
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{'EXIT', Port, Reason} ->
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?CRITICAL_MSG("extauth script has exitted abruptly "
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"with reason '~p'",
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[Reason]),
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Pid = restart_instance(ProcessName, ExtPrg),
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flush_buffer_and_forward_messages(Pid),
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exit(port_terminated)
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end.
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flush_buffer_and_forward_messages(Pid) ->
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receive
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Message ->
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Pid ! Message, flush_buffer_and_forward_messages(Pid)
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after 0 -> true
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end.
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encode(L) -> str:join(L, <<":">>).
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decode([0, 0]) -> false;
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decode([0, 1]) -> true.
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-spec opt_type(extauth_instances) -> fun((pos_integer()) -> pos_integer());
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(atom()) -> [atom()].
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opt_type(extauth_instances) ->
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fun (V) when is_integer(V), V > 0 -> V end;
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opt_type(_) -> [extauth_instances].
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