mirror of
https://github.com/processone/ejabberd.git
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7bcbea2108
Since the main goal of jlib.erl is lost, all auxiliary functions are now moved to aux.erl, and the whole jlib.erl is now deprecated.
135 lines
4.0 KiB
Erlang
135 lines
4.0 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_pres_counter.erl
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%%% Author : Ahmed Omar
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%%% Purpose : Presence subscription flood prevention
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%%% Created : 23 Sep 2010 by Ahmed Omar
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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(mod_pres_counter).
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-behavior(gen_mod).
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-export([start/2, stop/1, reload/3, check_packet/4,
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mod_opt_type/1, depends/2]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("xmpp.hrl").
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-record(pres_counter,
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{dir, start, count, logged = false}).
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start(Host, _Opts) ->
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ejabberd_hooks:add(privacy_check_packet, Host, ?MODULE,
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check_packet, 25),
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ok.
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stop(Host) ->
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ejabberd_hooks:delete(privacy_check_packet, Host,
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?MODULE, check_packet, 25),
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ok.
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reload(_Host, _NewOpts, _OldOpts) ->
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ok.
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depends(_Host, _Opts) ->
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[].
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-spec check_packet(allow | deny, ejabberd_c2s:state() | jid(),
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stanza(), in | out) -> allow | deny.
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check_packet(Acc, #{jid := JID}, Packet, Dir) ->
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check_packet(Acc, JID, Packet, Dir);
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check_packet(_, #jid{lserver = LServer},
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#presence{from = From, to = To, type = Type}, Dir) ->
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IsSubscription = case Type of
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subscribe -> true;
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subscribed -> true;
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unsubscribe -> true;
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unsubscribed -> true;
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_ -> false
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end,
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if IsSubscription ->
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JID = case Dir of
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in -> To;
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out -> From
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end,
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update(LServer, JID, Dir);
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true -> allow
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end;
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check_packet(Acc, _, _, _) ->
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Acc.
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update(Server, JID, Dir) ->
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StormCount = gen_mod:get_module_opt(Server, ?MODULE, count,
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fun(I) when is_integer(I), I>0 -> I end,
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5),
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TimeInterval = gen_mod:get_module_opt(Server, ?MODULE, interval,
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fun(I) when is_integer(I), I>0 -> I end,
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60),
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TimeStamp = p1_time_compat:system_time(seconds),
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case read(Dir) of
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undefined ->
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write(Dir,
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#pres_counter{dir = Dir, start = TimeStamp, count = 1}),
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allow;
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#pres_counter{start = TimeStart, count = Count,
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logged = Logged} =
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R ->
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if TimeStamp - TimeStart > TimeInterval ->
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write(Dir,
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R#pres_counter{start = TimeStamp, count = 1}),
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allow;
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(Count =:= StormCount) and Logged -> {stop, deny};
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Count =:= StormCount ->
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write(Dir, R#pres_counter{logged = true}),
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case Dir of
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in ->
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?WARNING_MSG("User ~s is being flooded, ignoring received "
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"presence subscriptions",
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[jid:encode(JID)]);
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out ->
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IP = ejabberd_sm:get_user_ip(JID#jid.luser,
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JID#jid.lserver,
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JID#jid.lresource),
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?WARNING_MSG("Flooder detected: ~s, on IP: ~s ignoring "
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"sent presence subscriptions~n",
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[jid:encode(JID),
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aux:ip_to_list(IP)])
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end,
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{stop, deny};
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true ->
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write(Dir,
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R#pres_counter{start = TimeStamp, count = Count + 1}),
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allow
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end
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end.
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read(K) -> get({pres_counter, K}).
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write(K, V) -> put({pres_counter, K}, V).
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mod_opt_type(count) ->
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fun (I) when is_integer(I), I > 0 -> I end;
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mod_opt_type(interval) ->
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fun (I) when is_integer(I), I > 0 -> I end;
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mod_opt_type(_) -> [count, interval].
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