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

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%%%-------------------------------------------------------------------
%%% File : mod_shared_roster_ldap.erl
%%% Author : Realloc <realloc@realloc.spb.ru>
%%% Marcin Owsiany <marcin@owsiany.pl>
%%% Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%% Description : LDAP shared roster management
%%% Created : 5 Mar 2005 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 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.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%-------------------------------------------------------------------
-module(mod_shared_roster_ldap).
-behaviour(ejabberd_config).
-behaviour(gen_server).
-behaviour(gen_mod).
%% API
-export([start/2, stop/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-export([get_user_roster/2, c2s_session_opened/1,
get_jid_info/4, process_item/2, in_subscription/6,
out_subscription/4, mod_opt_type/1, opt_type/1, depends/2]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("mod_roster.hrl").
-include("eldap.hrl").
-define(SETS, gb_sets).
-define(CACHE_SIZE, 1000).
-define(USER_CACHE_VALIDITY, 300). %% in seconds
-define(GROUP_CACHE_VALIDITY, 300).
-define(LDAP_SEARCH_TIMEOUT, 5). %% Timeout for LDAP search queries in seconds
-define(INVALID_SETTING_MSG, "~s is not properly set! ~s will not function.").
-record(state,
{host = <<"">> :: binary(),
eldap_id = <<"">> :: binary(),
servers = [] :: [binary()],
backups = [] :: [binary()],
port = ?LDAP_PORT :: inet:port_number(),
tls_options = [] :: list(),
dn = <<"">> :: binary(),
base = <<"">> :: binary(),
password = <<"">> :: binary(),
uid = <<"">> :: binary(),
deref_aliases = never :: never | searching |
finding | always,
group_attr = <<"">> :: binary(),
group_desc = <<"">> :: binary(),
user_desc = <<"">> :: binary(),
user_uid = <<"">> :: binary(),
uid_format = <<"">> :: binary(),
uid_format_re = <<"">> :: binary(),
filter = <<"">> :: binary(),
ufilter = <<"">> :: binary(),
rfilter = <<"">> :: binary(),
gfilter = <<"">> :: binary(),
auth_check = true :: boolean(),
user_cache_size = ?CACHE_SIZE :: non_neg_integer(),
group_cache_size = ?CACHE_SIZE :: non_neg_integer(),
user_cache_validity = ?USER_CACHE_VALIDITY :: non_neg_integer(),
group_cache_validity = ?GROUP_CACHE_VALIDITY :: non_neg_integer()}).
-record(group_info, {desc, members}).
%%====================================================================
%% API
%%====================================================================
start(Host, Opts) ->
gen_mod:start_child(?MODULE, Host, Opts).
stop(Host) ->
gen_mod:stop_child(?MODULE, Host).
depends(_Host, _Opts) ->
[{mod_roster, hard}].
%%--------------------------------------------------------------------
%% Hooks
%%--------------------------------------------------------------------
-spec get_user_roster([#roster{}], {binary(), binary()}) -> [#roster{}].
get_user_roster(Items, {U, S} = US) ->
SRUsers = get_user_to_groups_map(US, true),
{NewItems1, SRUsersRest} = lists:mapfoldl(fun (Item,
SRUsers1) ->
{_, _, {U1, S1, _}} =
Item#roster.usj,
US1 = {U1, S1},
case dict:find(US1,
SRUsers1)
of
{ok, _GroupNames} ->
{Item#roster{subscription
=
both,
ask =
none},
dict:erase(US1,
SRUsers1)};
error ->
{Item, SRUsers1}
end
end,
SRUsers, Items),
SRItems = [#roster{usj = {U, S, {U1, S1, <<"">>}},
us = US, jid = {U1, S1, <<"">>},
name = get_user_name(U1, S1), subscription = both,
ask = none, groups = GroupNames}
|| {{U1, S1}, GroupNames} <- dict:to_list(SRUsersRest)],
SRItems ++ NewItems1.
%% This function in use to rewrite the roster entries when moving or renaming
%% them in the user contact list.
-spec process_item(#roster{}, binary()) -> #roster{}.
process_item(RosterItem, _Host) ->
USFrom = RosterItem#roster.us,
{User, Server, _Resource} = RosterItem#roster.jid,
USTo = {User, Server},
Map = get_user_to_groups_map(USFrom, false),
case dict:find(USTo, Map) of
error -> RosterItem;
{ok, []} -> RosterItem;
{ok, GroupNames}
when RosterItem#roster.subscription == remove ->
RosterItem#roster{subscription = both, ask = none,
groups = GroupNames};
_ -> RosterItem#roster{subscription = both, ask = none}
end.
c2s_session_opened(#{jid := #jid{luser = LUser, lserver = LServer},
pres_f := PresF, pres_t := PresT} = State) ->
US = {LUser, LServer},
DisplayedGroups = get_user_displayed_groups(US),
SRUsers = lists:flatmap(fun(Group) ->
get_group_users(LServer, Group)
end,
DisplayedGroups),
PresBoth = lists:foldl(
fun({U, S, _}, Acc) ->
?SETS:add_element({U, S, <<"">>}, Acc);
({U, S}, Acc) ->
?SETS:add_element({U, S, <<"">>}, Acc)
end, ?SETS:new(), SRUsers),
State#{pres_f => ?SETS:union(PresBoth, PresF),
pres_t => ?SETS:union(PresBoth, PresT)}.
-spec get_jid_info({subscription(), [binary()]}, binary(), binary(), jid())
-> {subscription(), [binary()]}.
get_jid_info({Subscription, Groups}, User, Server,
JID) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
US = {LUser, LServer},
{U1, S1, _} = jid:tolower(JID),
US1 = {U1, S1},
SRUsers = get_user_to_groups_map(US, false),
case dict:find(US1, SRUsers) of
{ok, GroupNames} ->
NewGroups = if Groups == [] -> GroupNames;
true -> Groups
end,
{both, NewGroups};
error -> {Subscription, Groups}
end.
-spec in_subscription(boolean(), binary(), binary(), jid(),
subscribe | subscribed | unsubscribe | unsubscribed,
binary()) -> boolean().
in_subscription(Acc, User, Server, JID, Type,
_Reason) ->
process_subscription(in, User, Server, JID, Type, Acc).
-spec out_subscription(
binary(), binary(), jid(),
subscribed | unsubscribed | subscribe | unsubscribe) -> boolean().
out_subscription(User, Server, JID, Type) ->
process_subscription(out, User, Server, JID, Type,
false).
process_subscription(Direction, User, Server, JID,
_Type, Acc) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
US = {LUser, LServer},
{U1, S1, _} =
jid:tolower(jid:remove_resource(JID)),
US1 = {U1, S1},
DisplayedGroups = get_user_displayed_groups(US),
SRUsers = lists:usort(lists:flatmap(fun (Group) ->
get_group_users(LServer, Group)
end,
DisplayedGroups)),
case lists:member(US1, SRUsers) of
true ->
case Direction of
in -> {stop, false};
out -> stop
end;
false -> Acc
end.
%%====================================================================
%% gen_server callbacks
%%====================================================================
init([Host, Opts]) ->
process_flag(trap_exit, true),
State = parse_options(Host, Opts),
cache_tab:new(shared_roster_ldap_user,
[{max_size, State#state.user_cache_size}, {lru, false},
{life_time, State#state.user_cache_validity}]),
cache_tab:new(shared_roster_ldap_group,
[{max_size, State#state.group_cache_size}, {lru, false},
{life_time, State#state.group_cache_validity}]),
ejabberd_hooks:add(roster_get, Host, ?MODULE,
get_user_roster, 70),
ejabberd_hooks:add(roster_in_subscription, Host,
?MODULE, in_subscription, 30),
ejabberd_hooks:add(roster_out_subscription, Host,
?MODULE, out_subscription, 30),
ejabberd_hooks:add(c2s_session_opened, Host,
?MODULE, c2s_session_opened, 70),
ejabberd_hooks:add(roster_get_jid_info, Host, ?MODULE,
get_jid_info, 70),
ejabberd_hooks:add(roster_process_item, Host, ?MODULE,
process_item, 50),
eldap_pool:start_link(State#state.eldap_id,
State#state.servers, State#state.backups,
State#state.port, State#state.dn,
State#state.password, State#state.tls_options),
{ok, State}.
handle_call(get_state, _From, State) ->
{reply, {ok, State}, State};
handle_call(_Request, _From, State) ->
{reply, {error, badarg}, State}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, State) ->
Host = State#state.host,
ejabberd_hooks:delete(roster_get, Host, ?MODULE,
get_user_roster, 70),
ejabberd_hooks:delete(roster_in_subscription, Host,
?MODULE, in_subscription, 30),
ejabberd_hooks:delete(roster_out_subscription, Host,
?MODULE, out_subscription, 30),
ejabberd_hooks:delete(c2s_session_opened,
Host, ?MODULE, c2s_session_opened, 70),
ejabberd_hooks:delete(roster_get_jid_info, Host,
?MODULE, get_jid_info, 70),
ejabberd_hooks:delete(roster_process_item, Host,
?MODULE, process_item, 50).
code_change(_OldVsn, State, _Extra) -> {ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
get_user_to_groups_map({_, Server} = US, SkipUS) ->
DisplayedGroups = get_user_displayed_groups(US),
lists:foldl(fun (Group, Dict1) ->
GroupName = get_group_name(Server, Group),
lists:foldl(fun (Contact, Dict) ->
if SkipUS, Contact == US -> Dict;
true ->
dict:append(Contact,
GroupName, Dict)
end
end,
Dict1, get_group_users(Server, Group))
end,
dict:new(), DisplayedGroups).
eldap_search(State, FilterParseArgs, AttributesList) ->
case apply(eldap_filter, parse, FilterParseArgs) of
{ok, EldapFilter} ->
case eldap_pool:search(State#state.eldap_id,
[{base, State#state.base},
{filter, EldapFilter},
{timeout, ?LDAP_SEARCH_TIMEOUT},
{deref_aliases, State#state.deref_aliases},
{attributes, AttributesList}])
of
#eldap_search_result{entries = Es} ->
%% A result with entries. Return their list.
Es;
_ ->
%% Something else. Pretend we got no results.
[]
end;
_ ->
%% Filter parsing failed. Pretend we got no results.
[]
end.
get_user_displayed_groups({User, Host}) ->
{ok, State} = eldap_utils:get_state(Host, ?MODULE),
GroupAttr = State#state.group_attr,
Entries = eldap_search(State,
[eldap_filter:do_sub(State#state.rfilter,
[{<<"%u">>, User}])],
[GroupAttr]),
Reply = lists:flatmap(fun (#eldap_entry{attributes =
Attrs}) ->
case Attrs of
[{GroupAttr, ValuesList}] -> ValuesList;
_ -> []
end
end,
Entries),
lists:usort(Reply).
get_group_users(Host, Group) ->
{ok, State} = eldap_utils:get_state(Host, ?MODULE),
case cache_tab:dirty_lookup(shared_roster_ldap_group,
{Group, Host},
fun () -> search_group_info(State, Group) end) of
{ok, #group_info{members = Members}}
when Members /= undefined ->
Members;
_ -> []
end.
get_group_name(Host, Group) ->
{ok, State} = eldap_utils:get_state(Host, ?MODULE),
case cache_tab:dirty_lookup(shared_roster_ldap_group,
{Group, Host},
fun () -> search_group_info(State, Group) end)
of
{ok, #group_info{desc = GroupName}}
when GroupName /= undefined ->
GroupName;
_ -> Group
end.
get_user_name(User, Host) ->
{ok, State} = eldap_utils:get_state(Host, ?MODULE),
case cache_tab:dirty_lookup(shared_roster_ldap_user,
{User, Host},
fun () -> search_user_name(State, User) end)
of
{ok, UserName} -> UserName;
error -> User
end.
search_group_info(State, Group) ->
Extractor = case State#state.uid_format_re of
<<"">> ->
fun (UID) ->
catch eldap_utils:get_user_part(UID,
State#state.uid_format)
end;
_ ->
fun (UID) ->
catch get_user_part_re(UID,
State#state.uid_format_re)
end
end,
AuthChecker = case State#state.auth_check of
true -> fun ejabberd_auth:is_user_exists/2;
_ -> fun (_U, _S) -> true end
end,
case eldap_search(State,
[eldap_filter:do_sub(State#state.gfilter,
[{<<"%g">>, Group}])],
[State#state.group_attr, State#state.group_desc,
State#state.uid])
of
[] ->
error;
LDAPEntries ->
{GroupDesc, MembersLists} = lists:foldl(fun(Entry, Acc) ->
extract_members(State, Extractor, AuthChecker, Entry, Acc)
end,
{Group, []}, LDAPEntries),
{ok, #group_info{desc = GroupDesc, members = lists:usort(lists:flatten(MembersLists))}}
end.
extract_members(State, Extractor, AuthChecker, #eldap_entry{attributes = Attrs}, {DescAcc, JIDsAcc}) ->
Host = State#state.host,
case {eldap_utils:get_ldap_attr(State#state.group_attr, Attrs),
eldap_utils:get_ldap_attr(State#state.group_desc, Attrs),
lists:keysearch(State#state.uid, 1, Attrs)} of
{ID, Desc, {value, {GroupMemberAttr, Members}}} when ID /= <<"">>,
GroupMemberAttr == State#state.uid ->
JIDs = lists:foldl(fun({ok, UID}, L) ->
PUID = jid:nodeprep(UID),
case PUID of
error ->
L;
_ ->
case AuthChecker(PUID, Host) of
true ->
[{PUID, Host} | L];
_ ->
L
end
end;
(_, L) -> L
end,
[],
lists:map(Extractor, Members)),
{Desc, [JIDs | JIDsAcc]};
_ ->
{DescAcc, JIDsAcc}
end.
search_user_name(State, User) ->
case eldap_search(State,
[eldap_filter:do_sub(State#state.ufilter,
[{<<"%u">>, User}])],
[State#state.user_desc, State#state.user_uid])
of
[#eldap_entry{attributes = Attrs} | _] ->
case {eldap_utils:get_ldap_attr(State#state.user_uid,
Attrs),
eldap_utils:get_ldap_attr(State#state.user_desc, Attrs)}
of
{UID, Desc} when UID /= <<"">> -> {ok, Desc};
_ -> error
end;
[] -> error
end.
%% Getting User ID part by regex pattern
get_user_part_re(String, Pattern) ->
case catch re:run(String, Pattern) of
{match, Captured} ->
{First, Len} = lists:nth(2, Captured),
Result = str:sub_string(String, First + 1, First + Len),
{ok, Result};
_ -> {error, badmatch}
end.
parse_options(Host, Opts) ->
Eldap_ID = jlib:atom_to_binary(gen_mod:get_module_proc(Host, ?MODULE)),
Cfg = eldap_utils:get_config(Host, Opts),
GroupAttr = gen_mod:get_opt(ldap_groupattr, Opts,
fun iolist_to_binary/1,
<<"cn">>),
GroupDesc = gen_mod:get_opt(ldap_groupdesc, Opts,
fun iolist_to_binary/1,
GroupAttr),
UserDesc = gen_mod:get_opt(ldap_userdesc, Opts,
fun iolist_to_binary/1,
<<"cn">>),
UserUID = gen_mod:get_opt(ldap_useruid, Opts,
fun iolist_to_binary/1,
<<"cn">>),
UIDAttr = gen_mod:get_opt(ldap_memberattr, Opts,
fun iolist_to_binary/1,
<<"memberUid">>),
UIDAttrFormat = gen_mod:get_opt(ldap_memberattr_format, Opts,
fun iolist_to_binary/1,
<<"%u">>),
UIDAttrFormatRe = gen_mod:get_opt(ldap_memberattr_format_re, Opts,
fun(S) ->
Re = iolist_to_binary(S),
{ok, MP} = re:compile(Re),
MP
end, <<"">>),
AuthCheck = gen_mod:get_opt(ldap_auth_check, Opts,
fun(on) -> true;
(off) -> false;
(false) -> false;
(true) -> true
end, true),
UserCacheValidity = gen_mod:get_opt(
{ldap_user_cache_validity, Host}, Opts,
fun(I) when is_integer(I), I>0 -> I end,
?USER_CACHE_VALIDITY),
GroupCacheValidity = gen_mod:get_opt(
{ldap_group_cache_validity, Host}, Opts,
fun(I) when is_integer(I), I>0 -> I end,
?GROUP_CACHE_VALIDITY),
UserCacheSize = gen_mod:get_opt(
{ldap_user_cache_size, Host}, Opts,
fun(I) when is_integer(I), I>0 -> I end,
?CACHE_SIZE),
GroupCacheSize = gen_mod:get_opt(
{ldap_group_cache_size, Host}, Opts,
fun(I) when is_integer(I), I>0 -> I end,
?CACHE_SIZE),
ConfigFilter = gen_mod:get_opt({ldap_filter, Host}, Opts,
fun check_filter/1, <<"">>),
ConfigUserFilter = gen_mod:get_opt({ldap_ufilter, Host}, Opts,
fun check_filter/1, <<"">>),
ConfigGroupFilter = gen_mod:get_opt({ldap_gfilter, Host}, Opts,
fun check_filter/1, <<"">>),
RosterFilter = gen_mod:get_opt({ldap_rfilter, Host}, Opts,
fun check_filter/1, <<"">>),
SubFilter = <<"(&(", UIDAttr/binary, "=",
UIDAttrFormat/binary, ")(", GroupAttr/binary, "=%g))">>,
UserSubFilter = case ConfigUserFilter of
<<"">> ->
eldap_filter:do_sub(SubFilter, [{<<"%g">>, <<"*">>}]);
UString -> UString
end,
GroupSubFilter = case ConfigGroupFilter of
<<"">> ->
eldap_filter:do_sub(SubFilter,
[{<<"%u">>, <<"*">>}]);
GString -> GString
end,
Filter = case ConfigFilter of
<<"">> -> SubFilter;
_ ->
<<"(&", SubFilter/binary, ConfigFilter/binary, ")">>
end,
UserFilter = case ConfigFilter of
<<"">> -> UserSubFilter;
_ ->
<<"(&", UserSubFilter/binary, ConfigFilter/binary, ")">>
end,
GroupFilter = case ConfigFilter of
<<"">> -> GroupSubFilter;
_ ->
<<"(&", GroupSubFilter/binary, ConfigFilter/binary,
")">>
end,
#state{host = Host, eldap_id = Eldap_ID,
servers = Cfg#eldap_config.servers,
backups = Cfg#eldap_config.backups,
port = Cfg#eldap_config.port,
tls_options = Cfg#eldap_config.tls_options,
dn = Cfg#eldap_config.dn,
password = Cfg#eldap_config.password,
base = Cfg#eldap_config.base,
deref_aliases = Cfg#eldap_config.deref_aliases,
uid = UIDAttr,
group_attr = GroupAttr, group_desc = GroupDesc,
user_desc = UserDesc, user_uid = UserUID,
uid_format = UIDAttrFormat,
uid_format_re = UIDAttrFormatRe, filter = Filter,
ufilter = UserFilter, rfilter = RosterFilter,
gfilter = GroupFilter, auth_check = AuthCheck,
user_cache_size = UserCacheSize,
user_cache_validity = UserCacheValidity,
group_cache_size = GroupCacheSize,
group_cache_validity = GroupCacheValidity}.
check_filter(F) ->
NewF = iolist_to_binary(F),
{ok, _} = eldap_filter:parse(NewF),
NewF.
mod_opt_type(deref_aliases) ->
fun (never) -> never;
(searching) -> searching;
(finding) -> finding;
(always) -> always
end;
mod_opt_type(ldap_backups) ->
fun (L) -> [iolist_to_binary(H) || H <- L] end;
mod_opt_type(ldap_base) -> fun iolist_to_binary/1;
mod_opt_type(ldap_deref_aliases) ->
fun (never) -> never;
(searching) -> searching;
(finding) -> finding;
(always) -> always
end;
mod_opt_type(ldap_encrypt) ->
fun (tls) -> tls;
(starttls) -> starttls;
(none) -> none
end;
mod_opt_type(ldap_password) -> fun iolist_to_binary/1;
mod_opt_type(ldap_port) ->
fun (I) when is_integer(I), I > 0 -> I end;
mod_opt_type(ldap_rootdn) -> fun iolist_to_binary/1;
mod_opt_type(ldap_servers) ->
fun (L) -> [iolist_to_binary(H) || H <- L] end;
mod_opt_type(ldap_tls_cacertfile) ->
fun iolist_to_binary/1;
mod_opt_type(ldap_tls_certfile) ->
fun iolist_to_binary/1;
mod_opt_type(ldap_tls_depth) ->
fun (I) when is_integer(I), I >= 0 -> I end;
mod_opt_type(ldap_tls_verify) ->
fun (hard) -> hard;
(soft) -> soft;
(false) -> false
end;
mod_opt_type(ldap_auth_check) ->
fun (on) -> true;
(off) -> false;
(false) -> false;
(true) -> true
end;
mod_opt_type(ldap_filter) -> fun check_filter/1;
mod_opt_type(ldap_gfilter) -> fun check_filter/1;
mod_opt_type(ldap_group_cache_size) ->
fun (I) when is_integer(I), I > 0 -> I end;
mod_opt_type(ldap_group_cache_validity) ->
fun (I) when is_integer(I), I > 0 -> I end;
mod_opt_type(ldap_groupattr) -> fun iolist_to_binary/1;
mod_opt_type(ldap_groupdesc) -> fun iolist_to_binary/1;
mod_opt_type(ldap_memberattr) -> fun iolist_to_binary/1;
mod_opt_type(ldap_memberattr_format) ->
fun iolist_to_binary/1;
mod_opt_type(ldap_memberattr_format_re) ->
fun (S) ->
Re = iolist_to_binary(S), {ok, MP} = re:compile(Re), MP
end;
mod_opt_type(ldap_rfilter) -> fun check_filter/1;
mod_opt_type(ldap_ufilter) -> fun check_filter/1;
mod_opt_type(ldap_user_cache_size) ->
fun (I) when is_integer(I), I > 0 -> I end;
mod_opt_type(ldap_user_cache_validity) ->
fun (I) when is_integer(I), I > 0 -> I end;
mod_opt_type(ldap_userdesc) -> fun iolist_to_binary/1;
mod_opt_type(ldap_useruid) -> fun iolist_to_binary/1;
mod_opt_type(_) ->
[ldap_auth_check, ldap_filter, ldap_gfilter,
ldap_group_cache_size, ldap_group_cache_validity,
ldap_groupattr, ldap_groupdesc, ldap_memberattr,
ldap_memberattr_format, ldap_memberattr_format_re,
ldap_rfilter, ldap_ufilter, ldap_user_cache_size,
ldap_user_cache_validity, ldap_userdesc, ldap_useruid,
deref_aliases, ldap_backups, ldap_base,
ldap_deref_aliases, ldap_encrypt, ldap_password,
ldap_port, ldap_rootdn, ldap_servers,
ldap_tls_cacertfile, ldap_tls_certfile, ldap_tls_depth,
ldap_tls_verify].
opt_type(ldap_filter) -> fun check_filter/1;
opt_type(ldap_gfilter) -> fun check_filter/1;
opt_type(ldap_group_cache_size) ->
fun (I) when is_integer(I), I > 0 -> I end;
opt_type(ldap_group_cache_validity) ->
fun (I) when is_integer(I), I > 0 -> I end;
opt_type(ldap_rfilter) -> fun check_filter/1;
opt_type(ldap_ufilter) -> fun check_filter/1;
opt_type(ldap_user_cache_size) ->
fun (I) when is_integer(I), I > 0 -> I end;
opt_type(ldap_user_cache_validity) ->
fun (I) when is_integer(I), I > 0 -> I end;
opt_type(_) ->
[ldap_filter, ldap_gfilter, ldap_group_cache_size,
ldap_group_cache_validity, ldap_rfilter, ldap_ufilter,
ldap_user_cache_size, ldap_user_cache_validity].
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