421 lines
14 KiB
Erlang
421 lines
14 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_auth_ldap.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Authentification via LDAP
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%%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2013 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_ldap).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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-behaviour(ejabberd_auth).
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%% gen_server callbacks
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-export([init/1, handle_info/2, handle_call/3,
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handle_cast/2, terminate/2, code_change/3]).
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%% External exports
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-export([start/1, stop/1, start_link/1, set_password/3,
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check_password/3, check_password/5, try_register/3,
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dirty_get_registered_users/0, get_vh_registered_users/1,
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get_vh_registered_users/2,
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get_vh_registered_users_number/1,
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get_vh_registered_users_number/2, get_password/2,
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get_password_s/2, is_user_exists/2, remove_user/2,
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remove_user/3, store_type/0,
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plain_password_required/0]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("eldap.hrl").
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-record(state,
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{host = <<"">> :: binary(),
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eldap_id = <<"">> :: binary(),
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bind_eldap_id = <<"">> :: binary(),
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servers = [] :: [binary()],
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backups = [] :: [binary()],
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port = ?LDAP_PORT :: inet:port_number(),
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tls_options = [] :: list(),
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dn = <<"">> :: binary(),
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password = <<"">> :: binary(),
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base = <<"">> :: binary(),
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uids = [] :: [{binary()} | {binary(), binary()}],
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ufilter = <<"">> :: binary(),
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sfilter = <<"">> :: binary(),
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lfilter :: {any(), any()},
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deref_aliases = never :: never | searching | finding | always,
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dn_filter :: binary(),
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dn_filter_attrs = [] :: [binary()]}).
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handle_cast(_Request, State) -> {noreply, State}.
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code_change(_OldVsn, State, _Extra) -> {ok, State}.
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handle_info(_Info, State) -> {noreply, State}.
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-define(LDAP_SEARCH_TIMEOUT, 5).
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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ChildSpec = {Proc, {?MODULE, start_link, [Host]},
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transient, 1000, worker, [?MODULE]},
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supervisor:start_child(ejabberd_sup, ChildSpec).
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stop(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:call(Proc, stop),
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supervisor:terminate_child(ejabberd_sup, Proc),
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supervisor:delete_child(ejabberd_sup, Proc).
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start_link(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:start_link({local, Proc}, ?MODULE, Host, []).
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terminate(_Reason, _State) -> ok.
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init(Host) ->
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State = parse_options(Host),
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eldap_pool:start_link(State#state.eldap_id,
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State#state.servers, State#state.backups,
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State#state.port, State#state.dn,
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State#state.password, State#state.tls_options),
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eldap_pool:start_link(State#state.bind_eldap_id,
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State#state.servers, State#state.backups,
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State#state.port, State#state.dn,
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State#state.password, State#state.tls_options),
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{ok, State}.
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plain_password_required() -> true.
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store_type() -> external.
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check_password(User, Server, Password) ->
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if Password == <<"">> -> false;
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true ->
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case catch check_password_ldap(User, Server, Password)
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of
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{'EXIT', _} -> false;
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Result -> Result
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end
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end.
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check_password(User, Server, Password, _Digest,
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_DigestGen) ->
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check_password(User, Server, Password).
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set_password(User, Server, Password) ->
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{ok, State} = eldap_utils:get_state(Server, ?MODULE),
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case find_user_dn(User, State) of
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false -> {error, user_not_found};
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DN ->
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eldap_pool:modify_passwd(State#state.eldap_id, DN,
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Password)
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end.
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%% @spec (User, Server, Password) -> {error, not_allowed}
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try_register(_User, _Server, _Password) ->
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{error, not_allowed}.
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dirty_get_registered_users() ->
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Servers = ejabberd_config:get_vh_by_auth_method(ldap),
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lists:flatmap(fun (Server) ->
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get_vh_registered_users(Server)
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end,
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Servers).
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get_vh_registered_users(Server) ->
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case catch get_vh_registered_users_ldap(Server) of
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{'EXIT', _} -> [];
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Result -> Result
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end.
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get_vh_registered_users(Server, _) ->
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get_vh_registered_users(Server).
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get_vh_registered_users_number(Server) ->
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length(get_vh_registered_users(Server)).
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get_vh_registered_users_number(Server, _) ->
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get_vh_registered_users_number(Server).
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get_password(_User, _Server) -> false.
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get_password_s(_User, _Server) -> <<"">>.
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%% @spec (User, Server) -> true | false | {error, Error}
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is_user_exists(User, Server) ->
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case catch is_user_exists_ldap(User, Server) of
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{'EXIT', Error} -> {error, Error};
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Result -> Result
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end.
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remove_user(_User, _Server) -> {error, not_allowed}.
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remove_user(_User, _Server, _Password) -> not_allowed.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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check_password_ldap(User, Server, Password) ->
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{ok, State} = eldap_utils:get_state(Server, ?MODULE),
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case find_user_dn(User, State) of
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false -> false;
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DN ->
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case eldap_pool:bind(State#state.bind_eldap_id, DN,
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Password)
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of
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ok -> true;
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_ -> false
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end
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end.
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get_vh_registered_users_ldap(Server) ->
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{ok, State} = eldap_utils:get_state(Server, ?MODULE),
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UIDs = State#state.uids,
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Eldap_ID = State#state.eldap_id,
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Server = State#state.host,
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ResAttrs = result_attrs(State),
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case eldap_filter:parse(State#state.sfilter) of
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{ok, EldapFilter} ->
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case eldap_pool:search(Eldap_ID,
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[{base, State#state.base},
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{filter, EldapFilter},
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{timeout, ?LDAP_SEARCH_TIMEOUT},
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{deref_aliases, State#state.deref_aliases},
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{attributes, ResAttrs}])
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of
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#eldap_search_result{entries = Entries} ->
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lists:flatmap(fun (#eldap_entry{attributes = Attrs,
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object_name = DN}) ->
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case is_valid_dn(DN, Attrs, State) of
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false -> [];
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_ ->
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case
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eldap_utils:find_ldap_attrs(UIDs,
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Attrs)
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of
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<<"">> -> [];
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{User, UIDFormat} ->
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case
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eldap_utils:get_user_part(User,
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UIDFormat)
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of
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{ok, U} ->
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case jlib:nodeprep(U) of
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error -> [];
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LU ->
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[{LU,
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jlib:nameprep(Server)}]
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end;
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_ -> []
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end
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end
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end
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end,
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Entries);
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_ -> []
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end;
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_ -> []
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end.
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is_user_exists_ldap(User, Server) ->
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{ok, State} = eldap_utils:get_state(Server, ?MODULE),
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case find_user_dn(User, State) of
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false -> false;
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_DN -> true
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end.
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handle_call(get_state, _From, State) ->
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{reply, {ok, State}, State};
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State};
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handle_call(_Request, _From, State) ->
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{reply, bad_request, State}.
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find_user_dn(User, State) ->
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ResAttrs = result_attrs(State),
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case eldap_filter:parse(State#state.ufilter,
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[{<<"%u">>, User}])
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of
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{ok, Filter} ->
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case eldap_pool:search(State#state.eldap_id,
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[{base, State#state.base}, {filter, Filter},
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{deref_aliases, State#state.deref_aliases},
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{attributes, ResAttrs}])
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of
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#eldap_search_result{entries =
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[#eldap_entry{attributes = Attrs,
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object_name = DN}
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| _]} ->
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dn_filter(DN, Attrs, State);
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_ -> false
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end;
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_ -> false
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end.
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%% apply the dn filter and the local filter:
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dn_filter(DN, Attrs, State) ->
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case check_local_filter(Attrs, State) of
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false -> false;
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true -> is_valid_dn(DN, Attrs, State)
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end.
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%% Check that the DN is valid, based on the dn filter
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is_valid_dn(DN, _, #state{dn_filter = undefined}) -> DN;
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is_valid_dn(DN, Attrs, State) ->
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DNAttrs = State#state.dn_filter_attrs,
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UIDs = State#state.uids,
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Values = [{<<"%s">>,
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eldap_utils:get_ldap_attr(Attr, Attrs), 1}
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|| Attr <- DNAttrs],
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SubstValues = case eldap_utils:find_ldap_attrs(UIDs,
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Attrs)
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of
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<<"">> -> Values;
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{S, UAF} ->
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case eldap_utils:get_user_part(S, UAF) of
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{ok, U} -> [{<<"%u">>, U} | Values];
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_ -> Values
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end
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end
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++ [{<<"%d">>, State#state.host}, {<<"%D">>, DN}],
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case eldap_filter:parse(State#state.dn_filter,
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SubstValues)
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of
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{ok, EldapFilter} ->
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case eldap_pool:search(State#state.eldap_id,
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[{base, State#state.base},
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{filter, EldapFilter},
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{deref_aliases, State#state.deref_aliases},
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{attributes, [<<"dn">>]}])
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of
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#eldap_search_result{entries = [_ | _]} -> DN;
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_ -> false
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end;
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_ -> false
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end.
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%% The local filter is used to check an attribute in ejabberd
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%% and not in LDAP to limit the load on the LDAP directory.
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%% A local rule can be either:
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%% {equal, {"accountStatus",["active"]}}
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%% {notequal, {"accountStatus",["disabled"]}}
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%% {ldap_local_filter, {notequal, {"accountStatus",["disabled"]}}}
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check_local_filter(_Attrs,
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#state{lfilter = undefined}) ->
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true;
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check_local_filter(Attrs,
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#state{lfilter = LocalFilter}) ->
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{Operation, FilterMatch} = LocalFilter,
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local_filter(Operation, Attrs, FilterMatch).
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local_filter(equal, Attrs, FilterMatch) ->
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{Attr, Value} = FilterMatch,
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case lists:keysearch(Attr, 1, Attrs) of
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false -> false;
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{value, {Attr, Value}} -> true;
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_ -> false
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end;
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local_filter(notequal, Attrs, FilterMatch) ->
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not local_filter(equal, Attrs, FilterMatch).
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result_attrs(#state{uids = UIDs,
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dn_filter_attrs = DNFilterAttrs}) ->
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lists:foldl(fun ({UID}, Acc) -> [UID | Acc];
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({UID, _}, Acc) -> [UID | Acc]
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end,
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DNFilterAttrs, UIDs).
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%%%----------------------------------------------------------------------
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%%% Auxiliary functions
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%%%----------------------------------------------------------------------
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parse_options(Host) ->
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Cfg = eldap_utils:get_config(Host, []),
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Eldap_ID = jlib:atom_to_binary(gen_mod:get_module_proc(Host, ?MODULE)),
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Bind_Eldap_ID = jlib:atom_to_binary(
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gen_mod:get_module_proc(Host, bind_ejabberd_auth_ldap)),
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UIDsTemp = eldap_utils:get_opt(
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{ldap_uids, Host}, [],
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fun(Us) ->
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lists:map(
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fun({U, P}) ->
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{iolist_to_binary(U),
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iolist_to_binary(P)};
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({U}) ->
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{iolist_to_binary(U)};
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(U) ->
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{iolist_to_binary(U)}
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end, lists:flatten(Us))
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end, [{<<"uid">>, <<"%u">>}]),
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UIDs = eldap_utils:uids_domain_subst(Host, UIDsTemp),
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SubFilter = eldap_utils:generate_subfilter(UIDs),
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UserFilter = case eldap_utils:get_opt(
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{ldap_filter, Host}, [],
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fun check_filter/1, <<"">>) of
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<<"">> ->
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SubFilter;
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F ->
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<<"(&", SubFilter/binary, F/binary, ")">>
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end,
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SearchFilter = eldap_filter:do_sub(UserFilter,
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[{<<"%u">>, <<"*">>}]),
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{DNFilter, DNFilterAttrs} =
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eldap_utils:get_opt({ldap_dn_filter, Host}, [],
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fun({DNF, DNFA}) ->
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NewDNFA = case DNFA of
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undefined ->
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[];
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_ ->
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[iolist_to_binary(A)
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|| A <- DNFA]
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end,
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NewDNF = check_filter(DNF),
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{NewDNF, NewDNFA}
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end, {undefined, []}),
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LocalFilter = eldap_utils:get_opt(
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{ldap_local_filter, Host}, [], fun(V) -> V end),
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#state{host = Host, eldap_id = Eldap_ID,
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bind_eldap_id = Bind_Eldap_ID,
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servers = Cfg#eldap_config.servers,
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backups = Cfg#eldap_config.backups,
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port = Cfg#eldap_config.port,
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tls_options = Cfg#eldap_config.tls_options,
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dn = Cfg#eldap_config.dn,
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password = Cfg#eldap_config.password,
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base = Cfg#eldap_config.base,
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deref_aliases = Cfg#eldap_config.deref_aliases,
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uids = UIDs, ufilter = UserFilter,
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sfilter = SearchFilter, lfilter = LocalFilter,
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dn_filter = DNFilter, dn_filter_attrs = DNFilterAttrs}.
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check_filter(F) ->
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NewF = iolist_to_binary(F),
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{ok, _} = eldap_filter:parse(NewF),
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NewF.
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