mirror of
https://github.com/processone/ejabberd.git
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188 lines
5.8 KiB
Erlang
188 lines
5.8 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_auth_anonymous.erl
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%%% Author : Mickael Remond <mickael.remond@process-one.net>
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%%% Purpose : Anonymous feature support in ejabberd
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%%% Created : 17 Feb 2006 by Mickael Remond <mremond@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2021 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(ejabberd_auth_anonymous).
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-behaviour(ejabberd_auth).
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-author('mickael.remond@process-one.net').
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-export([start/1,
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stop/1,
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use_cache/1,
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allow_anonymous/1,
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is_sasl_anonymous_enabled/1,
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is_login_anonymous_enabled/1,
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anonymous_user_exist/2,
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allow_multiple_connections/1,
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register_connection/3,
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unregister_connection/3
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]).
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-export([login/2, check_password/4, user_exists/2,
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get_users/2, count_users/2, store_type/1,
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plain_password_required/1]).
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-include("logger.hrl").
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-include_lib("xmpp/include/jid.hrl").
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start(Host) ->
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ejabberd_hooks:add(sm_register_connection_hook, Host,
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?MODULE, register_connection, 100),
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ejabberd_hooks:add(sm_remove_connection_hook, Host,
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?MODULE, unregister_connection, 100),
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ok.
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stop(Host) ->
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ejabberd_hooks:delete(sm_register_connection_hook, Host,
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?MODULE, register_connection, 100),
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ejabberd_hooks:delete(sm_remove_connection_hook, Host,
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?MODULE, unregister_connection, 100).
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use_cache(_) ->
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false.
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%% Return true if anonymous is allowed for host or false otherwise
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allow_anonymous(Host) ->
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lists:member(?MODULE, ejabberd_auth:auth_modules(Host)).
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%% Return true if anonymous mode is enabled and if anonymous protocol is SASL
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%% anonymous protocol can be: sasl_anon|login_anon|both
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is_sasl_anonymous_enabled(Host) ->
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case allow_anonymous(Host) of
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false -> false;
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true ->
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case anonymous_protocol(Host) of
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sasl_anon -> true;
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both -> true;
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_Other -> false
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end
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end.
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%% Return true if anonymous login is enabled on the server
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%% anonymous login can be use using standard authentication method (i.e. with
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%% clients that do not support anonymous login)
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is_login_anonymous_enabled(Host) ->
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case allow_anonymous(Host) of
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false -> false;
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true ->
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case anonymous_protocol(Host) of
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login_anon -> true;
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both -> true;
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_Other -> false
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end
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end.
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%% Return the anonymous protocol to use: sasl_anon|login_anon|both
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%% defaults to login_anon
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anonymous_protocol(Host) ->
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ejabberd_option:anonymous_protocol(Host).
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%% Return true if multiple connections have been allowed in the config file
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%% defaults to false
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allow_multiple_connections(Host) ->
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ejabberd_option:allow_multiple_connections(Host).
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anonymous_user_exist(User, Server) ->
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lists:any(
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fun({_LResource, Info}) ->
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proplists:get_value(auth_module, Info) == ?MODULE
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end, ejabberd_sm:get_user_info(User, Server)).
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%% Register connection
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-spec register_connection(ejabberd_sm:sid(), jid(), ejabberd_sm:info()) -> ok.
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register_connection(_SID,
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#jid{luser = LUser, lserver = LServer, lresource = LResource}, Info) ->
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case proplists:get_value(auth_module, Info) of
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?MODULE ->
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% Register user only if we are first resource
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case ejabberd_sm:get_user_resources(LUser, LServer) of
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[LResource] ->
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ejabberd_hooks:run(register_user, LServer, [LUser, LServer]);
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_ ->
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ok
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end;
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_ ->
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ok
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end.
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%% Remove an anonymous user from the anonymous users table
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-spec unregister_connection(ejabberd_sm:sid(), jid(), ejabberd_sm:info()) -> any().
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unregister_connection(_SID,
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#jid{luser = LUser, lserver = LServer}, Info) ->
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case proplists:get_value(auth_module, Info) of
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?MODULE ->
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% Remove user data only if there is no more resources around
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case ejabberd_sm:get_user_resources(LUser, LServer) of
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[] ->
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ejabberd_hooks:run(remove_user, LServer, [LUser, LServer]);
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_ ->
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ok
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end;
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_ ->
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ok
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end.
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%% ---------------------------------
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%% Specific anonymous auth functions
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%% ---------------------------------
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check_password(User, _AuthzId, Server, _Password) ->
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{nocache,
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case ejabberd_auth:user_exists_in_other_modules(?MODULE, User, Server) of
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%% If user exists in other module, reject anonnymous authentication
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true -> false;
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%% If we are not sure whether the user exists in other module, reject anon auth
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maybe -> false;
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false -> login(User, Server)
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end}.
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login(User, Server) ->
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case is_login_anonymous_enabled(Server) of
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false -> false;
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true ->
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case anonymous_user_exist(User, Server) of
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%% Reject the login if an anonymous user with the same login
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%% is already logged and if multiple login has not been enable
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%% in the config file.
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true -> allow_multiple_connections(Server);
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%% Accept login and add user to the anonymous table
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false -> true
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end
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end.
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get_users(Server, _) ->
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[{U, S} || {U, S, _R} <- ejabberd_sm:get_vh_session_list(Server)].
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count_users(Server, Opts) ->
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length(get_users(Server, Opts)).
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user_exists(User, Server) ->
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{nocache, anonymous_user_exist(User, Server)}.
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plain_password_required(_) ->
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false.
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store_type(_) ->
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external.
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